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/filter.h" 56 #include "qapi/string-output-visitor.h" 57 58 /* Net bridge is currently not supported for W32. */ 59 #if !defined(_WIN32) 60 # define CONFIG_NET_BRIDGE 61 #endif 62 63 static VMChangeStateEntry *net_change_state_entry; 64 static QTAILQ_HEAD(, NetClientState) net_clients; 65 66 /***********************************************************/ 67 /* network device redirectors */ 68 69 int parse_host_port(struct sockaddr_in *saddr, const char *str, 70 Error **errp) 71 { 72 gchar **substrings; 73 struct hostent *he; 74 const char *addr, *p, *r; 75 int port, ret = 0; 76 77 substrings = g_strsplit(str, ":", 2); 78 if (!substrings || !substrings[0] || !substrings[1]) { 79 error_setg(errp, "host address '%s' doesn't contain ':' " 80 "separating host from port", str); 81 ret = -1; 82 goto out; 83 } 84 85 addr = substrings[0]; 86 p = substrings[1]; 87 88 saddr->sin_family = AF_INET; 89 if (addr[0] == '\0') { 90 saddr->sin_addr.s_addr = 0; 91 } else { 92 if (qemu_isdigit(addr[0])) { 93 if (!inet_aton(addr, &saddr->sin_addr)) { 94 error_setg(errp, "host address '%s' is not a valid " 95 "IPv4 address", addr); 96 ret = -1; 97 goto out; 98 } 99 } else { 100 he = gethostbyname(addr); 101 if (he == NULL) { 102 error_setg(errp, "can't resolve host address '%s'", addr); 103 ret = -1; 104 goto out; 105 } 106 saddr->sin_addr = *(struct in_addr *)he->h_addr; 107 } 108 } 109 port = strtol(p, (char **)&r, 0); 110 if (r == p) { 111 error_setg(errp, "port number '%s' is invalid", p); 112 ret = -1; 113 goto out; 114 } 115 saddr->sin_port = htons(port); 116 117 out: 118 g_strfreev(substrings); 119 return ret; 120 } 121 122 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 123 { 124 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 125 macaddr[0], macaddr[1], macaddr[2], 126 macaddr[3], macaddr[4], macaddr[5]); 127 } 128 129 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 130 { 131 snprintf(nc->info_str, sizeof(nc->info_str), 132 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 133 nc->model, 134 macaddr[0], macaddr[1], macaddr[2], 135 macaddr[3], macaddr[4], macaddr[5]); 136 } 137 138 static int mac_table[256] = {0}; 139 140 static void qemu_macaddr_set_used(MACAddr *macaddr) 141 { 142 int index; 143 144 for (index = 0x56; index < 0xFF; index++) { 145 if (macaddr->a[5] == index) { 146 mac_table[index]++; 147 } 148 } 149 } 150 151 static void qemu_macaddr_set_free(MACAddr *macaddr) 152 { 153 int index; 154 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 155 156 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 157 return; 158 } 159 for (index = 0x56; index < 0xFF; index++) { 160 if (macaddr->a[5] == index) { 161 mac_table[index]--; 162 } 163 } 164 } 165 166 static int qemu_macaddr_get_free(void) 167 { 168 int index; 169 170 for (index = 0x56; index < 0xFF; index++) { 171 if (mac_table[index] == 0) { 172 return index; 173 } 174 } 175 176 return -1; 177 } 178 179 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 180 { 181 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 182 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 183 184 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 185 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 186 return; 187 } else { 188 qemu_macaddr_set_used(macaddr); 189 return; 190 } 191 } 192 193 macaddr->a[0] = 0x52; 194 macaddr->a[1] = 0x54; 195 macaddr->a[2] = 0x00; 196 macaddr->a[3] = 0x12; 197 macaddr->a[4] = 0x34; 198 macaddr->a[5] = qemu_macaddr_get_free(); 199 qemu_macaddr_set_used(macaddr); 200 } 201 202 /** 203 * Generate a name for net client 204 * 205 * Only net clients created with the legacy -net option and NICs need this. 206 */ 207 static char *assign_name(NetClientState *nc1, const char *model) 208 { 209 NetClientState *nc; 210 int id = 0; 211 212 QTAILQ_FOREACH(nc, &net_clients, next) { 213 if (nc == nc1) { 214 continue; 215 } 216 if (strcmp(nc->model, model) == 0) { 217 id++; 218 } 219 } 220 221 return g_strdup_printf("%s.%d", model, id); 222 } 223 224 static void qemu_net_client_destructor(NetClientState *nc) 225 { 226 g_free(nc); 227 } 228 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 229 unsigned flags, 230 const struct iovec *iov, 231 int iovcnt, 232 void *opaque); 233 234 static void qemu_net_client_setup(NetClientState *nc, 235 NetClientInfo *info, 236 NetClientState *peer, 237 const char *model, 238 const char *name, 239 NetClientDestructor *destructor) 240 { 241 nc->info = info; 242 nc->model = g_strdup(model); 243 if (name) { 244 nc->name = g_strdup(name); 245 } else { 246 nc->name = assign_name(nc, model); 247 } 248 249 if (peer) { 250 assert(!peer->peer); 251 nc->peer = peer; 252 peer->peer = nc; 253 } 254 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 255 256 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 257 nc->destructor = destructor; 258 QTAILQ_INIT(&nc->filters); 259 } 260 261 NetClientState *qemu_new_net_client(NetClientInfo *info, 262 NetClientState *peer, 263 const char *model, 264 const char *name) 265 { 266 NetClientState *nc; 267 268 assert(info->size >= sizeof(NetClientState)); 269 270 nc = g_malloc0(info->size); 271 qemu_net_client_setup(nc, info, peer, model, name, 272 qemu_net_client_destructor); 273 274 return nc; 275 } 276 277 NICState *qemu_new_nic(NetClientInfo *info, 278 NICConf *conf, 279 const char *model, 280 const char *name, 281 void *opaque) 282 { 283 NetClientState **peers = conf->peers.ncs; 284 NICState *nic; 285 int i, queues = MAX(1, conf->peers.queues); 286 287 assert(info->type == NET_CLIENT_DRIVER_NIC); 288 assert(info->size >= sizeof(NICState)); 289 290 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 291 nic->ncs = (void *)nic + info->size; 292 nic->conf = conf; 293 nic->opaque = opaque; 294 295 for (i = 0; i < queues; i++) { 296 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 297 NULL); 298 nic->ncs[i].queue_index = i; 299 } 300 301 return nic; 302 } 303 304 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 305 { 306 return nic->ncs + queue_index; 307 } 308 309 NetClientState *qemu_get_queue(NICState *nic) 310 { 311 return qemu_get_subqueue(nic, 0); 312 } 313 314 NICState *qemu_get_nic(NetClientState *nc) 315 { 316 NetClientState *nc0 = nc - nc->queue_index; 317 318 return (NICState *)((void *)nc0 - nc->info->size); 319 } 320 321 void *qemu_get_nic_opaque(NetClientState *nc) 322 { 323 NICState *nic = qemu_get_nic(nc); 324 325 return nic->opaque; 326 } 327 328 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 329 { 330 assert(nc != NULL); 331 NetClientState *ncs = nc + queue_index; 332 return ncs->peer; 333 } 334 335 static void qemu_cleanup_net_client(NetClientState *nc) 336 { 337 QTAILQ_REMOVE(&net_clients, nc, next); 338 339 if (nc->info->cleanup) { 340 nc->info->cleanup(nc); 341 } 342 } 343 344 static void qemu_free_net_client(NetClientState *nc) 345 { 346 if (nc->incoming_queue) { 347 qemu_del_net_queue(nc->incoming_queue); 348 } 349 if (nc->peer) { 350 nc->peer->peer = NULL; 351 } 352 g_free(nc->name); 353 g_free(nc->model); 354 if (nc->destructor) { 355 nc->destructor(nc); 356 } 357 } 358 359 void qemu_del_net_client(NetClientState *nc) 360 { 361 NetClientState *ncs[MAX_QUEUE_NUM]; 362 int queues, i; 363 NetFilterState *nf, *next; 364 365 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 366 367 /* If the NetClientState belongs to a multiqueue backend, we will change all 368 * other NetClientStates also. 369 */ 370 queues = qemu_find_net_clients_except(nc->name, ncs, 371 NET_CLIENT_DRIVER_NIC, 372 MAX_QUEUE_NUM); 373 assert(queues != 0); 374 375 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 376 object_unparent(OBJECT(nf)); 377 } 378 379 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 380 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 381 NICState *nic = qemu_get_nic(nc->peer); 382 if (nic->peer_deleted) { 383 return; 384 } 385 nic->peer_deleted = true; 386 387 for (i = 0; i < queues; i++) { 388 ncs[i]->peer->link_down = true; 389 } 390 391 if (nc->peer->info->link_status_changed) { 392 nc->peer->info->link_status_changed(nc->peer); 393 } 394 395 for (i = 0; i < queues; i++) { 396 qemu_cleanup_net_client(ncs[i]); 397 } 398 399 return; 400 } 401 402 for (i = 0; i < queues; i++) { 403 qemu_cleanup_net_client(ncs[i]); 404 qemu_free_net_client(ncs[i]); 405 } 406 } 407 408 void qemu_del_nic(NICState *nic) 409 { 410 int i, queues = MAX(nic->conf->peers.queues, 1); 411 412 qemu_macaddr_set_free(&nic->conf->macaddr); 413 414 for (i = 0; i < queues; i++) { 415 NetClientState *nc = qemu_get_subqueue(nic, i); 416 /* If this is a peer NIC and peer has already been deleted, free it now. */ 417 if (nic->peer_deleted) { 418 qemu_free_net_client(nc->peer); 419 } else if (nc->peer) { 420 /* if there are RX packets pending, complete them */ 421 qemu_purge_queued_packets(nc->peer); 422 } 423 } 424 425 for (i = queues - 1; i >= 0; i--) { 426 NetClientState *nc = qemu_get_subqueue(nic, i); 427 428 qemu_cleanup_net_client(nc); 429 qemu_free_net_client(nc); 430 } 431 432 g_free(nic); 433 } 434 435 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 436 { 437 NetClientState *nc; 438 439 QTAILQ_FOREACH(nc, &net_clients, next) { 440 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 441 if (nc->queue_index == 0) { 442 func(qemu_get_nic(nc), opaque); 443 } 444 } 445 } 446 } 447 448 bool qemu_has_ufo(NetClientState *nc) 449 { 450 if (!nc || !nc->info->has_ufo) { 451 return false; 452 } 453 454 return nc->info->has_ufo(nc); 455 } 456 457 bool qemu_has_vnet_hdr(NetClientState *nc) 458 { 459 if (!nc || !nc->info->has_vnet_hdr) { 460 return false; 461 } 462 463 return nc->info->has_vnet_hdr(nc); 464 } 465 466 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 467 { 468 if (!nc || !nc->info->has_vnet_hdr_len) { 469 return false; 470 } 471 472 return nc->info->has_vnet_hdr_len(nc, len); 473 } 474 475 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 476 { 477 if (!nc || !nc->info->using_vnet_hdr) { 478 return; 479 } 480 481 nc->info->using_vnet_hdr(nc, enable); 482 } 483 484 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 485 int ecn, int ufo) 486 { 487 if (!nc || !nc->info->set_offload) { 488 return; 489 } 490 491 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 492 } 493 494 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 495 { 496 if (!nc || !nc->info->set_vnet_hdr_len) { 497 return; 498 } 499 500 nc->vnet_hdr_len = len; 501 nc->info->set_vnet_hdr_len(nc, len); 502 } 503 504 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 505 { 506 #ifdef HOST_WORDS_BIGENDIAN 507 if (!nc || !nc->info->set_vnet_le) { 508 return -ENOSYS; 509 } 510 511 return nc->info->set_vnet_le(nc, is_le); 512 #else 513 return 0; 514 #endif 515 } 516 517 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 518 { 519 #ifdef HOST_WORDS_BIGENDIAN 520 return 0; 521 #else 522 if (!nc || !nc->info->set_vnet_be) { 523 return -ENOSYS; 524 } 525 526 return nc->info->set_vnet_be(nc, is_be); 527 #endif 528 } 529 530 int qemu_can_receive_packet(NetClientState *nc) 531 { 532 if (nc->receive_disabled) { 533 return 0; 534 } else if (nc->info->can_receive && 535 !nc->info->can_receive(nc)) { 536 return 0; 537 } 538 return 1; 539 } 540 541 int qemu_can_send_packet(NetClientState *sender) 542 { 543 int vm_running = runstate_is_running(); 544 545 if (!vm_running) { 546 return 0; 547 } 548 549 if (!sender->peer) { 550 return 1; 551 } 552 553 return qemu_can_receive_packet(sender->peer); 554 } 555 556 static ssize_t filter_receive_iov(NetClientState *nc, 557 NetFilterDirection direction, 558 NetClientState *sender, 559 unsigned flags, 560 const struct iovec *iov, 561 int iovcnt, 562 NetPacketSent *sent_cb) 563 { 564 ssize_t ret = 0; 565 NetFilterState *nf = NULL; 566 567 if (direction == NET_FILTER_DIRECTION_TX) { 568 QTAILQ_FOREACH(nf, &nc->filters, next) { 569 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 570 iovcnt, sent_cb); 571 if (ret) { 572 return ret; 573 } 574 } 575 } else { 576 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 577 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 578 iovcnt, sent_cb); 579 if (ret) { 580 return ret; 581 } 582 } 583 } 584 585 return ret; 586 } 587 588 static ssize_t filter_receive(NetClientState *nc, 589 NetFilterDirection direction, 590 NetClientState *sender, 591 unsigned flags, 592 const uint8_t *data, 593 size_t size, 594 NetPacketSent *sent_cb) 595 { 596 struct iovec iov = { 597 .iov_base = (void *)data, 598 .iov_len = size 599 }; 600 601 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 602 } 603 604 void qemu_purge_queued_packets(NetClientState *nc) 605 { 606 if (!nc->peer) { 607 return; 608 } 609 610 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 611 } 612 613 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 614 { 615 nc->receive_disabled = 0; 616 617 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 618 if (net_hub_flush(nc->peer)) { 619 qemu_notify_event(); 620 } 621 } 622 if (qemu_net_queue_flush(nc->incoming_queue)) { 623 /* We emptied the queue successfully, signal to the IO thread to repoll 624 * the file descriptor (for tap, for example). 625 */ 626 qemu_notify_event(); 627 } else if (purge) { 628 /* Unable to empty the queue, purge remaining packets */ 629 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 630 } 631 } 632 633 void qemu_flush_queued_packets(NetClientState *nc) 634 { 635 qemu_flush_or_purge_queued_packets(nc, false); 636 } 637 638 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 639 unsigned flags, 640 const uint8_t *buf, int size, 641 NetPacketSent *sent_cb) 642 { 643 NetQueue *queue; 644 int ret; 645 646 #ifdef DEBUG_NET 647 printf("qemu_send_packet_async:\n"); 648 qemu_hexdump(stdout, "net", buf, size); 649 #endif 650 651 if (sender->link_down || !sender->peer) { 652 return size; 653 } 654 655 /* Let filters handle the packet first */ 656 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 657 sender, flags, buf, size, sent_cb); 658 if (ret) { 659 return ret; 660 } 661 662 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 663 sender, flags, buf, size, sent_cb); 664 if (ret) { 665 return ret; 666 } 667 668 queue = sender->peer->incoming_queue; 669 670 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 671 } 672 673 ssize_t qemu_send_packet_async(NetClientState *sender, 674 const uint8_t *buf, int size, 675 NetPacketSent *sent_cb) 676 { 677 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 678 buf, size, sent_cb); 679 } 680 681 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 682 { 683 return qemu_send_packet_async(nc, buf, size, NULL); 684 } 685 686 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 687 { 688 if (!qemu_can_receive_packet(nc)) { 689 return 0; 690 } 691 692 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 693 } 694 695 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 696 int iovcnt) 697 { 698 if (!qemu_can_receive_packet(nc)) { 699 return 0; 700 } 701 702 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 703 } 704 705 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 706 { 707 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 708 buf, size, NULL); 709 } 710 711 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 712 int iovcnt, unsigned flags) 713 { 714 uint8_t *buf = NULL; 715 uint8_t *buffer; 716 size_t offset; 717 ssize_t ret; 718 719 if (iovcnt == 1) { 720 buffer = iov[0].iov_base; 721 offset = iov[0].iov_len; 722 } else { 723 offset = iov_size(iov, iovcnt); 724 if (offset > NET_BUFSIZE) { 725 return -1; 726 } 727 buf = g_malloc(offset); 728 buffer = buf; 729 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 730 } 731 732 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 733 ret = nc->info->receive_raw(nc, buffer, offset); 734 } else { 735 ret = nc->info->receive(nc, buffer, offset); 736 } 737 738 g_free(buf); 739 return ret; 740 } 741 742 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 743 unsigned flags, 744 const struct iovec *iov, 745 int iovcnt, 746 void *opaque) 747 { 748 NetClientState *nc = opaque; 749 int ret; 750 751 752 if (nc->link_down) { 753 return iov_size(iov, iovcnt); 754 } 755 756 if (nc->receive_disabled) { 757 return 0; 758 } 759 760 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 761 ret = nc->info->receive_iov(nc, iov, iovcnt); 762 } else { 763 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 764 } 765 766 if (ret == 0) { 767 nc->receive_disabled = 1; 768 } 769 770 return ret; 771 } 772 773 ssize_t qemu_sendv_packet_async(NetClientState *sender, 774 const struct iovec *iov, int iovcnt, 775 NetPacketSent *sent_cb) 776 { 777 NetQueue *queue; 778 size_t size = iov_size(iov, iovcnt); 779 int ret; 780 781 if (size > NET_BUFSIZE) { 782 return size; 783 } 784 785 if (sender->link_down || !sender->peer) { 786 return size; 787 } 788 789 /* Let filters handle the packet first */ 790 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 791 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 792 if (ret) { 793 return ret; 794 } 795 796 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 797 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 798 if (ret) { 799 return ret; 800 } 801 802 queue = sender->peer->incoming_queue; 803 804 return qemu_net_queue_send_iov(queue, sender, 805 QEMU_NET_PACKET_FLAG_NONE, 806 iov, iovcnt, sent_cb); 807 } 808 809 ssize_t 810 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 811 { 812 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 813 } 814 815 NetClientState *qemu_find_netdev(const char *id) 816 { 817 NetClientState *nc; 818 819 QTAILQ_FOREACH(nc, &net_clients, next) { 820 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 821 continue; 822 if (!strcmp(nc->name, id)) { 823 return nc; 824 } 825 } 826 827 return NULL; 828 } 829 830 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 831 NetClientDriver type, int max) 832 { 833 NetClientState *nc; 834 int ret = 0; 835 836 QTAILQ_FOREACH(nc, &net_clients, next) { 837 if (nc->info->type == type) { 838 continue; 839 } 840 if (!id || !strcmp(nc->name, id)) { 841 if (ret < max) { 842 ncs[ret] = nc; 843 } 844 ret++; 845 } 846 } 847 848 return ret; 849 } 850 851 static int nic_get_free_idx(void) 852 { 853 int index; 854 855 for (index = 0; index < MAX_NICS; index++) 856 if (!nd_table[index].used) 857 return index; 858 return -1; 859 } 860 861 int qemu_show_nic_models(const char *arg, const char *const *models) 862 { 863 int i; 864 865 if (!arg || !is_help_option(arg)) { 866 return 0; 867 } 868 869 printf("Supported NIC models:\n"); 870 for (i = 0 ; models[i]; i++) { 871 printf("%s\n", models[i]); 872 } 873 return 1; 874 } 875 876 void qemu_check_nic_model(NICInfo *nd, const char *model) 877 { 878 const char *models[2]; 879 880 models[0] = model; 881 models[1] = NULL; 882 883 if (qemu_show_nic_models(nd->model, models)) 884 exit(0); 885 if (qemu_find_nic_model(nd, models, model) < 0) 886 exit(1); 887 } 888 889 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 890 const char *default_model) 891 { 892 int i; 893 894 if (!nd->model) 895 nd->model = g_strdup(default_model); 896 897 for (i = 0 ; models[i]; i++) { 898 if (strcmp(nd->model, models[i]) == 0) 899 return i; 900 } 901 902 error_report("Unsupported NIC model: %s", nd->model); 903 return -1; 904 } 905 906 static int net_init_nic(const Netdev *netdev, const char *name, 907 NetClientState *peer, Error **errp) 908 { 909 int idx; 910 NICInfo *nd; 911 const NetLegacyNicOptions *nic; 912 913 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 914 nic = &netdev->u.nic; 915 916 idx = nic_get_free_idx(); 917 if (idx == -1 || nb_nics >= MAX_NICS) { 918 error_setg(errp, "too many NICs"); 919 return -1; 920 } 921 922 nd = &nd_table[idx]; 923 924 memset(nd, 0, sizeof(*nd)); 925 926 if (nic->has_netdev) { 927 nd->netdev = qemu_find_netdev(nic->netdev); 928 if (!nd->netdev) { 929 error_setg(errp, "netdev '%s' not found", nic->netdev); 930 return -1; 931 } 932 } else { 933 assert(peer); 934 nd->netdev = peer; 935 } 936 nd->name = g_strdup(name); 937 if (nic->has_model) { 938 nd->model = g_strdup(nic->model); 939 } 940 if (nic->has_addr) { 941 nd->devaddr = g_strdup(nic->addr); 942 } 943 944 if (nic->has_macaddr && 945 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 946 error_setg(errp, "invalid syntax for ethernet address"); 947 return -1; 948 } 949 if (nic->has_macaddr && 950 is_multicast_ether_addr(nd->macaddr.a)) { 951 error_setg(errp, 952 "NIC cannot have multicast MAC address (odd 1st byte)"); 953 return -1; 954 } 955 qemu_macaddr_default_if_unset(&nd->macaddr); 956 957 if (nic->has_vectors) { 958 if (nic->vectors > 0x7ffffff) { 959 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 960 return -1; 961 } 962 nd->nvectors = nic->vectors; 963 } else { 964 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 965 } 966 967 nd->used = 1; 968 nb_nics++; 969 970 return idx; 971 } 972 973 974 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 975 const Netdev *netdev, 976 const char *name, 977 NetClientState *peer, Error **errp) = { 978 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 979 #ifdef CONFIG_SLIRP 980 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 981 #endif 982 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 983 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 984 #ifdef CONFIG_VDE 985 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 986 #endif 987 #ifdef CONFIG_NETMAP 988 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 989 #endif 990 #ifdef CONFIG_NET_BRIDGE 991 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 992 #endif 993 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 994 #ifdef CONFIG_VHOST_NET_USER 995 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 996 #endif 997 #ifdef CONFIG_VHOST_NET_VDPA 998 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 999 #endif 1000 #ifdef CONFIG_L2TPV3 1001 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1002 #endif 1003 }; 1004 1005 1006 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1007 { 1008 NetClientState *peer = NULL; 1009 NetClientState *nc; 1010 1011 if (is_netdev) { 1012 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1013 !net_client_init_fun[netdev->type]) { 1014 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1015 "a netdev backend type"); 1016 return -1; 1017 } 1018 } else { 1019 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1020 return 0; /* nothing to do */ 1021 } 1022 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 1023 !net_client_init_fun[netdev->type]) { 1024 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1025 "a net backend type (maybe it is not compiled " 1026 "into this binary)"); 1027 return -1; 1028 } 1029 1030 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1031 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1032 !netdev->u.nic.has_netdev) { 1033 peer = net_hub_add_port(0, NULL, NULL); 1034 } 1035 } 1036 1037 nc = qemu_find_netdev(netdev->id); 1038 if (nc) { 1039 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1040 return -1; 1041 } 1042 1043 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1044 /* FIXME drop when all init functions store an Error */ 1045 if (errp && !*errp) { 1046 error_setg(errp, "Device '%s' could not be initialized", 1047 NetClientDriver_str(netdev->type)); 1048 } 1049 return -1; 1050 } 1051 1052 if (is_netdev) { 1053 nc = qemu_find_netdev(netdev->id); 1054 assert(nc); 1055 nc->is_netdev = true; 1056 } 1057 1058 return 0; 1059 } 1060 1061 void show_netdevs(void) 1062 { 1063 int idx; 1064 const char *available_netdevs[] = { 1065 "socket", 1066 "hubport", 1067 "tap", 1068 #ifdef CONFIG_SLIRP 1069 "user", 1070 #endif 1071 #ifdef CONFIG_L2TPV3 1072 "l2tpv3", 1073 #endif 1074 #ifdef CONFIG_VDE 1075 "vde", 1076 #endif 1077 #ifdef CONFIG_NET_BRIDGE 1078 "bridge", 1079 #endif 1080 #ifdef CONFIG_NETMAP 1081 "netmap", 1082 #endif 1083 #ifdef CONFIG_POSIX 1084 "vhost-user", 1085 #endif 1086 #ifdef CONFIG_VHOST_VDPA 1087 "vhost-vdpa", 1088 #endif 1089 }; 1090 1091 qemu_printf("Available netdev backend types:\n"); 1092 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1093 qemu_printf("%s\n", available_netdevs[idx]); 1094 } 1095 } 1096 1097 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1098 { 1099 gchar **substrings = NULL; 1100 Netdev *object = NULL; 1101 int ret = -1; 1102 Visitor *v = opts_visitor_new(opts); 1103 1104 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1105 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1106 1107 if (ip6_net) { 1108 char *prefix_addr; 1109 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1110 1111 substrings = g_strsplit(ip6_net, "/", 2); 1112 if (!substrings || !substrings[0]) { 1113 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1114 "a valid IPv6 prefix"); 1115 goto out; 1116 } 1117 1118 prefix_addr = substrings[0]; 1119 1120 /* Handle user-specified prefix length. */ 1121 if (substrings[1] && 1122 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1123 { 1124 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1125 "ipv6-prefixlen", "a number"); 1126 goto out; 1127 } 1128 1129 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1130 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1131 &error_abort); 1132 qemu_opt_unset(opts, "ipv6-net"); 1133 } 1134 1135 /* Create an ID for -net if the user did not specify one */ 1136 if (!is_netdev && !qemu_opts_id(opts)) { 1137 qemu_opts_set_id(opts, id_generate(ID_NET)); 1138 } 1139 1140 if (visit_type_Netdev(v, NULL, &object, errp)) { 1141 ret = net_client_init1(object, is_netdev, errp); 1142 } 1143 1144 qapi_free_Netdev(object); 1145 1146 out: 1147 g_strfreev(substrings); 1148 visit_free(v); 1149 return ret; 1150 } 1151 1152 void netdev_add(QemuOpts *opts, Error **errp) 1153 { 1154 net_client_init(opts, true, errp); 1155 } 1156 1157 void qmp_netdev_add(Netdev *netdev, Error **errp) 1158 { 1159 if (!id_wellformed(netdev->id)) { 1160 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1161 return; 1162 } 1163 1164 net_client_init1(netdev, true, errp); 1165 } 1166 1167 void qmp_netdev_del(const char *id, Error **errp) 1168 { 1169 NetClientState *nc; 1170 QemuOpts *opts; 1171 1172 nc = qemu_find_netdev(id); 1173 if (!nc) { 1174 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1175 "Device '%s' not found", id); 1176 return; 1177 } 1178 1179 if (!nc->is_netdev) { 1180 error_setg(errp, "Device '%s' is not a netdev", id); 1181 return; 1182 } 1183 1184 qemu_del_net_client(nc); 1185 1186 /* 1187 * Wart: we need to delete the QemuOpts associated with netdevs 1188 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1189 * HMP netdev_add. 1190 */ 1191 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1192 if (opts) { 1193 qemu_opts_del(opts); 1194 } 1195 } 1196 1197 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1198 { 1199 char *str; 1200 ObjectProperty *prop; 1201 ObjectPropertyIterator iter; 1202 Visitor *v; 1203 1204 /* generate info str */ 1205 object_property_iter_init(&iter, OBJECT(nf)); 1206 while ((prop = object_property_iter_next(&iter))) { 1207 if (!strcmp(prop->name, "type")) { 1208 continue; 1209 } 1210 v = string_output_visitor_new(false, &str); 1211 object_property_get(OBJECT(nf), prop->name, v, NULL); 1212 visit_complete(v, &str); 1213 visit_free(v); 1214 monitor_printf(mon, ",%s=%s", prop->name, str); 1215 g_free(str); 1216 } 1217 monitor_printf(mon, "\n"); 1218 } 1219 1220 void print_net_client(Monitor *mon, NetClientState *nc) 1221 { 1222 NetFilterState *nf; 1223 1224 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1225 nc->queue_index, 1226 NetClientDriver_str(nc->info->type), 1227 nc->info_str); 1228 if (!QTAILQ_EMPTY(&nc->filters)) { 1229 monitor_printf(mon, "filters:\n"); 1230 } 1231 QTAILQ_FOREACH(nf, &nc->filters, next) { 1232 monitor_printf(mon, " - %s: type=%s", 1233 object_get_canonical_path_component(OBJECT(nf)), 1234 object_get_typename(OBJECT(nf))); 1235 netfilter_print_info(mon, nf); 1236 } 1237 } 1238 1239 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1240 Error **errp) 1241 { 1242 NetClientState *nc; 1243 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1244 1245 QTAILQ_FOREACH(nc, &net_clients, next) { 1246 RxFilterInfo *info; 1247 1248 if (has_name && strcmp(nc->name, name) != 0) { 1249 continue; 1250 } 1251 1252 /* only query rx-filter information of NIC */ 1253 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1254 if (has_name) { 1255 error_setg(errp, "net client(%s) isn't a NIC", name); 1256 assert(!filter_list); 1257 return NULL; 1258 } 1259 continue; 1260 } 1261 1262 /* only query information on queue 0 since the info is per nic, 1263 * not per queue 1264 */ 1265 if (nc->queue_index != 0) 1266 continue; 1267 1268 if (nc->info->query_rx_filter) { 1269 info = nc->info->query_rx_filter(nc); 1270 QAPI_LIST_APPEND(tail, info); 1271 } else if (has_name) { 1272 error_setg(errp, "net client(%s) doesn't support" 1273 " rx-filter querying", name); 1274 assert(!filter_list); 1275 return NULL; 1276 } 1277 1278 if (has_name) { 1279 break; 1280 } 1281 } 1282 1283 if (filter_list == NULL && has_name) { 1284 error_setg(errp, "invalid net client name: %s", name); 1285 } 1286 1287 return filter_list; 1288 } 1289 1290 void hmp_info_network(Monitor *mon, const QDict *qdict) 1291 { 1292 NetClientState *nc, *peer; 1293 NetClientDriver type; 1294 1295 net_hub_info(mon); 1296 1297 QTAILQ_FOREACH(nc, &net_clients, next) { 1298 peer = nc->peer; 1299 type = nc->info->type; 1300 1301 /* Skip if already printed in hub info */ 1302 if (net_hub_id_for_client(nc, NULL) == 0) { 1303 continue; 1304 } 1305 1306 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1307 print_net_client(mon, nc); 1308 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1309 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1310 monitor_printf(mon, " \\ "); 1311 print_net_client(mon, peer); 1312 } 1313 } 1314 } 1315 1316 void colo_notify_filters_event(int event, Error **errp) 1317 { 1318 NetClientState *nc; 1319 NetFilterState *nf; 1320 NetFilterClass *nfc = NULL; 1321 Error *local_err = NULL; 1322 1323 QTAILQ_FOREACH(nc, &net_clients, next) { 1324 QTAILQ_FOREACH(nf, &nc->filters, next) { 1325 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1326 nfc->handle_event(nf, event, &local_err); 1327 if (local_err) { 1328 error_propagate(errp, local_err); 1329 return; 1330 } 1331 } 1332 } 1333 } 1334 1335 void qmp_set_link(const char *name, bool up, Error **errp) 1336 { 1337 NetClientState *ncs[MAX_QUEUE_NUM]; 1338 NetClientState *nc; 1339 int queues, i; 1340 1341 queues = qemu_find_net_clients_except(name, ncs, 1342 NET_CLIENT_DRIVER__MAX, 1343 MAX_QUEUE_NUM); 1344 1345 if (queues == 0) { 1346 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1347 "Device '%s' not found", name); 1348 return; 1349 } 1350 nc = ncs[0]; 1351 1352 for (i = 0; i < queues; i++) { 1353 ncs[i]->link_down = !up; 1354 } 1355 1356 if (nc->info->link_status_changed) { 1357 nc->info->link_status_changed(nc); 1358 } 1359 1360 if (nc->peer) { 1361 /* Change peer link only if the peer is NIC and then notify peer. 1362 * If the peer is a HUBPORT or a backend, we do not change the 1363 * link status. 1364 * 1365 * This behavior is compatible with qemu hubs where there could be 1366 * multiple clients that can still communicate with each other in 1367 * disconnected mode. For now maintain this compatibility. 1368 */ 1369 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1370 for (i = 0; i < queues; i++) { 1371 ncs[i]->peer->link_down = !up; 1372 } 1373 } 1374 if (nc->peer->info->link_status_changed) { 1375 nc->peer->info->link_status_changed(nc->peer); 1376 } 1377 } 1378 } 1379 1380 static void net_vm_change_state_handler(void *opaque, bool running, 1381 RunState state) 1382 { 1383 NetClientState *nc; 1384 NetClientState *tmp; 1385 1386 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1387 if (running) { 1388 /* Flush queued packets and wake up backends. */ 1389 if (nc->peer && qemu_can_send_packet(nc)) { 1390 qemu_flush_queued_packets(nc->peer); 1391 } 1392 } else { 1393 /* Complete all queued packets, to guarantee we don't modify 1394 * state later when VM is not running. 1395 */ 1396 qemu_flush_or_purge_queued_packets(nc, true); 1397 } 1398 } 1399 } 1400 1401 void net_cleanup(void) 1402 { 1403 NetClientState *nc; 1404 1405 /* We may del multiple entries during qemu_del_net_client(), 1406 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1407 */ 1408 while (!QTAILQ_EMPTY(&net_clients)) { 1409 nc = QTAILQ_FIRST(&net_clients); 1410 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1411 qemu_del_nic(qemu_get_nic(nc)); 1412 } else { 1413 qemu_del_net_client(nc); 1414 } 1415 } 1416 1417 qemu_del_vm_change_state_handler(net_change_state_entry); 1418 } 1419 1420 void net_check_clients(void) 1421 { 1422 NetClientState *nc; 1423 int i; 1424 1425 net_hub_check_clients(); 1426 1427 QTAILQ_FOREACH(nc, &net_clients, next) { 1428 if (!nc->peer) { 1429 warn_report("%s %s has no peer", 1430 nc->info->type == NET_CLIENT_DRIVER_NIC 1431 ? "nic" : "netdev", 1432 nc->name); 1433 } 1434 } 1435 1436 /* Check that all NICs requested via -net nic actually got created. 1437 * NICs created via -device don't need to be checked here because 1438 * they are always instantiated. 1439 */ 1440 for (i = 0; i < MAX_NICS; i++) { 1441 NICInfo *nd = &nd_table[i]; 1442 if (nd->used && !nd->instantiated) { 1443 warn_report("requested NIC (%s, model %s) " 1444 "was not created (not supported by this machine?)", 1445 nd->name ? nd->name : "anonymous", 1446 nd->model ? nd->model : "unspecified"); 1447 } 1448 } 1449 } 1450 1451 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1452 { 1453 return net_client_init(opts, false, errp); 1454 } 1455 1456 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1457 { 1458 const char *type = qemu_opt_get(opts, "type"); 1459 1460 if (type && is_help_option(type)) { 1461 show_netdevs(); 1462 exit(0); 1463 } 1464 return net_client_init(opts, true, errp); 1465 } 1466 1467 /* For the convenience "--nic" parameter */ 1468 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1469 { 1470 char *mac, *nd_id; 1471 int idx, ret; 1472 NICInfo *ni; 1473 const char *type; 1474 1475 type = qemu_opt_get(opts, "type"); 1476 if (type && g_str_equal(type, "none")) { 1477 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1478 } 1479 1480 idx = nic_get_free_idx(); 1481 if (idx == -1 || nb_nics >= MAX_NICS) { 1482 error_setg(errp, "no more on-board/default NIC slots available"); 1483 return -1; 1484 } 1485 1486 if (!type) { 1487 qemu_opt_set(opts, "type", "user", &error_abort); 1488 } 1489 1490 ni = &nd_table[idx]; 1491 memset(ni, 0, sizeof(*ni)); 1492 ni->model = qemu_opt_get_del(opts, "model"); 1493 1494 /* Create an ID if the user did not specify one */ 1495 nd_id = g_strdup(qemu_opts_id(opts)); 1496 if (!nd_id) { 1497 nd_id = id_generate(ID_NET); 1498 qemu_opts_set_id(opts, nd_id); 1499 } 1500 1501 /* Handle MAC address */ 1502 mac = qemu_opt_get_del(opts, "mac"); 1503 if (mac) { 1504 ret = net_parse_macaddr(ni->macaddr.a, mac); 1505 g_free(mac); 1506 if (ret) { 1507 error_setg(errp, "invalid syntax for ethernet address"); 1508 goto out; 1509 } 1510 if (is_multicast_ether_addr(ni->macaddr.a)) { 1511 error_setg(errp, "NIC cannot have multicast MAC address"); 1512 ret = -1; 1513 goto out; 1514 } 1515 } 1516 qemu_macaddr_default_if_unset(&ni->macaddr); 1517 1518 ret = net_client_init(opts, true, errp); 1519 if (ret == 0) { 1520 ni->netdev = qemu_find_netdev(nd_id); 1521 ni->used = true; 1522 nb_nics++; 1523 } 1524 1525 out: 1526 g_free(nd_id); 1527 return ret; 1528 } 1529 1530 int net_init_clients(Error **errp) 1531 { 1532 net_change_state_entry = 1533 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1534 1535 QTAILQ_INIT(&net_clients); 1536 1537 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1538 net_init_netdev, NULL, errp)) { 1539 return -1; 1540 } 1541 1542 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1543 return -1; 1544 } 1545 1546 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1547 return -1; 1548 } 1549 1550 return 0; 1551 } 1552 1553 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1554 { 1555 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1556 return -1; 1557 } 1558 1559 return 0; 1560 } 1561 1562 /* From FreeBSD */ 1563 /* XXX: optimize */ 1564 uint32_t net_crc32(const uint8_t *p, int len) 1565 { 1566 uint32_t crc; 1567 int carry, i, j; 1568 uint8_t b; 1569 1570 crc = 0xffffffff; 1571 for (i = 0; i < len; i++) { 1572 b = *p++; 1573 for (j = 0; j < 8; j++) { 1574 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1575 crc <<= 1; 1576 b >>= 1; 1577 if (carry) { 1578 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1579 } 1580 } 1581 } 1582 1583 return crc; 1584 } 1585 1586 uint32_t net_crc32_le(const uint8_t *p, int len) 1587 { 1588 uint32_t crc; 1589 int carry, i, j; 1590 uint8_t b; 1591 1592 crc = 0xffffffff; 1593 for (i = 0; i < len; i++) { 1594 b = *p++; 1595 for (j = 0; j < 8; j++) { 1596 carry = (crc & 0x1) ^ (b & 0x01); 1597 crc >>= 1; 1598 b >>= 1; 1599 if (carry) { 1600 crc ^= POLYNOMIAL_LE; 1601 } 1602 } 1603 } 1604 1605 return crc; 1606 } 1607 1608 QemuOptsList qemu_netdev_opts = { 1609 .name = "netdev", 1610 .implied_opt_name = "type", 1611 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1612 .desc = { 1613 /* 1614 * no elements => accept any params 1615 * validation will happen later 1616 */ 1617 { /* end of list */ } 1618 }, 1619 }; 1620 1621 QemuOptsList qemu_nic_opts = { 1622 .name = "nic", 1623 .implied_opt_name = "type", 1624 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1625 .desc = { 1626 /* 1627 * no elements => accept any params 1628 * validation will happen later 1629 */ 1630 { /* end of list */ } 1631 }, 1632 }; 1633 1634 QemuOptsList qemu_net_opts = { 1635 .name = "net", 1636 .implied_opt_name = "type", 1637 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1638 .desc = { 1639 /* 1640 * no elements => accept any params 1641 * validation will happen later 1642 */ 1643 { /* end of list */ } 1644 }, 1645 }; 1646 1647 void net_socket_rs_init(SocketReadState *rs, 1648 SocketReadStateFinalize *finalize, 1649 bool vnet_hdr) 1650 { 1651 rs->state = 0; 1652 rs->vnet_hdr = vnet_hdr; 1653 rs->index = 0; 1654 rs->packet_len = 0; 1655 rs->vnet_hdr_len = 0; 1656 memset(rs->buf, 0, sizeof(rs->buf)); 1657 rs->finalize = finalize; 1658 } 1659 1660 /* 1661 * Returns 1662 * 0: success 1663 * -1: error occurs 1664 */ 1665 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1666 { 1667 unsigned int l; 1668 1669 while (size > 0) { 1670 /* Reassemble a packet from the network. 1671 * 0 = getting length. 1672 * 1 = getting vnet header length. 1673 * 2 = getting data. 1674 */ 1675 switch (rs->state) { 1676 case 0: 1677 l = 4 - rs->index; 1678 if (l > size) { 1679 l = size; 1680 } 1681 memcpy(rs->buf + rs->index, buf, l); 1682 buf += l; 1683 size -= l; 1684 rs->index += l; 1685 if (rs->index == 4) { 1686 /* got length */ 1687 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1688 rs->index = 0; 1689 if (rs->vnet_hdr) { 1690 rs->state = 1; 1691 } else { 1692 rs->state = 2; 1693 rs->vnet_hdr_len = 0; 1694 } 1695 } 1696 break; 1697 case 1: 1698 l = 4 - rs->index; 1699 if (l > size) { 1700 l = size; 1701 } 1702 memcpy(rs->buf + rs->index, buf, l); 1703 buf += l; 1704 size -= l; 1705 rs->index += l; 1706 if (rs->index == 4) { 1707 /* got vnet header length */ 1708 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1709 rs->index = 0; 1710 rs->state = 2; 1711 } 1712 break; 1713 case 2: 1714 l = rs->packet_len - rs->index; 1715 if (l > size) { 1716 l = size; 1717 } 1718 if (rs->index + l <= sizeof(rs->buf)) { 1719 memcpy(rs->buf + rs->index, buf, l); 1720 } else { 1721 fprintf(stderr, "serious error: oversized packet received," 1722 "connection terminated.\n"); 1723 rs->index = rs->state = 0; 1724 return -1; 1725 } 1726 1727 rs->index += l; 1728 buf += l; 1729 size -= l; 1730 if (rs->index >= rs->packet_len) { 1731 rs->index = 0; 1732 rs->state = 0; 1733 assert(rs->finalize); 1734 rs->finalize(rs); 1735 } 1736 break; 1737 } 1738 } 1739 1740 assert(size == 0); 1741 return 0; 1742 } 1743