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/sysemu.h" 55 #include "sysemu/runstate.h" 56 #include "sysemu/sysemu.h" 57 #include "net/filter.h" 58 #include "qapi/string-output-visitor.h" 59 60 /* Net bridge is currently not supported for W32. */ 61 #if !defined(_WIN32) 62 # define CONFIG_NET_BRIDGE 63 #endif 64 65 static VMChangeStateEntry *net_change_state_entry; 66 static QTAILQ_HEAD(, NetClientState) net_clients; 67 68 /***********************************************************/ 69 /* network device redirectors */ 70 71 int parse_host_port(struct sockaddr_in *saddr, const char *str, 72 Error **errp) 73 { 74 gchar **substrings; 75 struct hostent *he; 76 const char *addr, *p, *r; 77 int port, ret = 0; 78 79 substrings = g_strsplit(str, ":", 2); 80 if (!substrings || !substrings[0] || !substrings[1]) { 81 error_setg(errp, "host address '%s' doesn't contain ':' " 82 "separating host from port", str); 83 ret = -1; 84 goto out; 85 } 86 87 addr = substrings[0]; 88 p = substrings[1]; 89 90 saddr->sin_family = AF_INET; 91 if (addr[0] == '\0') { 92 saddr->sin_addr.s_addr = 0; 93 } else { 94 if (qemu_isdigit(addr[0])) { 95 if (!inet_aton(addr, &saddr->sin_addr)) { 96 error_setg(errp, "host address '%s' is not a valid " 97 "IPv4 address", addr); 98 ret = -1; 99 goto out; 100 } 101 } else { 102 he = gethostbyname(addr); 103 if (he == NULL) { 104 error_setg(errp, "can't resolve host address '%s'", addr); 105 ret = -1; 106 goto out; 107 } 108 saddr->sin_addr = *(struct in_addr *)he->h_addr; 109 } 110 } 111 port = strtol(p, (char **)&r, 0); 112 if (r == p) { 113 error_setg(errp, "port number '%s' is invalid", p); 114 ret = -1; 115 goto out; 116 } 117 saddr->sin_port = htons(port); 118 119 out: 120 g_strfreev(substrings); 121 return ret; 122 } 123 124 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 125 { 126 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 127 macaddr[0], macaddr[1], macaddr[2], 128 macaddr[3], macaddr[4], macaddr[5]); 129 } 130 131 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 132 { 133 snprintf(nc->info_str, sizeof(nc->info_str), 134 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 135 nc->model, 136 macaddr[0], macaddr[1], macaddr[2], 137 macaddr[3], macaddr[4], macaddr[5]); 138 } 139 140 static int mac_table[256] = {0}; 141 142 static void qemu_macaddr_set_used(MACAddr *macaddr) 143 { 144 int index; 145 146 for (index = 0x56; index < 0xFF; index++) { 147 if (macaddr->a[5] == index) { 148 mac_table[index]++; 149 } 150 } 151 } 152 153 static void qemu_macaddr_set_free(MACAddr *macaddr) 154 { 155 int index; 156 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 157 158 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 159 return; 160 } 161 for (index = 0x56; index < 0xFF; index++) { 162 if (macaddr->a[5] == index) { 163 mac_table[index]--; 164 } 165 } 166 } 167 168 static int qemu_macaddr_get_free(void) 169 { 170 int index; 171 172 for (index = 0x56; index < 0xFF; index++) { 173 if (mac_table[index] == 0) { 174 return index; 175 } 176 } 177 178 return -1; 179 } 180 181 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 182 { 183 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 184 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 185 186 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 187 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 188 return; 189 } else { 190 qemu_macaddr_set_used(macaddr); 191 return; 192 } 193 } 194 195 macaddr->a[0] = 0x52; 196 macaddr->a[1] = 0x54; 197 macaddr->a[2] = 0x00; 198 macaddr->a[3] = 0x12; 199 macaddr->a[4] = 0x34; 200 macaddr->a[5] = qemu_macaddr_get_free(); 201 qemu_macaddr_set_used(macaddr); 202 } 203 204 /** 205 * Generate a name for net client 206 * 207 * Only net clients created with the legacy -net option and NICs need this. 208 */ 209 static char *assign_name(NetClientState *nc1, const char *model) 210 { 211 NetClientState *nc; 212 int id = 0; 213 214 QTAILQ_FOREACH(nc, &net_clients, next) { 215 if (nc == nc1) { 216 continue; 217 } 218 if (strcmp(nc->model, model) == 0) { 219 id++; 220 } 221 } 222 223 return g_strdup_printf("%s.%d", model, id); 224 } 225 226 static void qemu_net_client_destructor(NetClientState *nc) 227 { 228 g_free(nc); 229 } 230 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 231 unsigned flags, 232 const struct iovec *iov, 233 int iovcnt, 234 void *opaque); 235 236 static void qemu_net_client_setup(NetClientState *nc, 237 NetClientInfo *info, 238 NetClientState *peer, 239 const char *model, 240 const char *name, 241 NetClientDestructor *destructor) 242 { 243 nc->info = info; 244 nc->model = g_strdup(model); 245 if (name) { 246 nc->name = g_strdup(name); 247 } else { 248 nc->name = assign_name(nc, model); 249 } 250 251 if (peer) { 252 assert(!peer->peer); 253 nc->peer = peer; 254 peer->peer = nc; 255 } 256 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 257 258 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 259 nc->destructor = destructor; 260 QTAILQ_INIT(&nc->filters); 261 } 262 263 NetClientState *qemu_new_net_client(NetClientInfo *info, 264 NetClientState *peer, 265 const char *model, 266 const char *name) 267 { 268 NetClientState *nc; 269 270 assert(info->size >= sizeof(NetClientState)); 271 272 nc = g_malloc0(info->size); 273 qemu_net_client_setup(nc, info, peer, model, name, 274 qemu_net_client_destructor); 275 276 return nc; 277 } 278 279 NICState *qemu_new_nic(NetClientInfo *info, 280 NICConf *conf, 281 const char *model, 282 const char *name, 283 void *opaque) 284 { 285 NetClientState **peers = conf->peers.ncs; 286 NICState *nic; 287 int i, queues = MAX(1, conf->peers.queues); 288 289 assert(info->type == NET_CLIENT_DRIVER_NIC); 290 assert(info->size >= sizeof(NICState)); 291 292 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 293 nic->ncs = (void *)nic + info->size; 294 nic->conf = conf; 295 nic->opaque = opaque; 296 297 for (i = 0; i < queues; i++) { 298 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 299 NULL); 300 nic->ncs[i].queue_index = i; 301 } 302 303 return nic; 304 } 305 306 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 307 { 308 return nic->ncs + queue_index; 309 } 310 311 NetClientState *qemu_get_queue(NICState *nic) 312 { 313 return qemu_get_subqueue(nic, 0); 314 } 315 316 NICState *qemu_get_nic(NetClientState *nc) 317 { 318 NetClientState *nc0 = nc - nc->queue_index; 319 320 return (NICState *)((void *)nc0 - nc->info->size); 321 } 322 323 void *qemu_get_nic_opaque(NetClientState *nc) 324 { 325 NICState *nic = qemu_get_nic(nc); 326 327 return nic->opaque; 328 } 329 330 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 331 { 332 assert(nc != NULL); 333 NetClientState *ncs = nc + queue_index; 334 return ncs->peer; 335 } 336 337 static void qemu_cleanup_net_client(NetClientState *nc) 338 { 339 QTAILQ_REMOVE(&net_clients, nc, next); 340 341 if (nc->info->cleanup) { 342 nc->info->cleanup(nc); 343 } 344 } 345 346 static void qemu_free_net_client(NetClientState *nc) 347 { 348 if (nc->incoming_queue) { 349 qemu_del_net_queue(nc->incoming_queue); 350 } 351 if (nc->peer) { 352 nc->peer->peer = NULL; 353 } 354 g_free(nc->name); 355 g_free(nc->model); 356 if (nc->destructor) { 357 nc->destructor(nc); 358 } 359 } 360 361 void qemu_del_net_client(NetClientState *nc) 362 { 363 NetClientState *ncs[MAX_QUEUE_NUM]; 364 int queues, i; 365 NetFilterState *nf, *next; 366 367 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 368 369 /* If the NetClientState belongs to a multiqueue backend, we will change all 370 * other NetClientStates also. 371 */ 372 queues = qemu_find_net_clients_except(nc->name, ncs, 373 NET_CLIENT_DRIVER_NIC, 374 MAX_QUEUE_NUM); 375 assert(queues != 0); 376 377 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 378 object_unparent(OBJECT(nf)); 379 } 380 381 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 382 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 383 NICState *nic = qemu_get_nic(nc->peer); 384 if (nic->peer_deleted) { 385 return; 386 } 387 nic->peer_deleted = true; 388 389 for (i = 0; i < queues; i++) { 390 ncs[i]->peer->link_down = true; 391 } 392 393 if (nc->peer->info->link_status_changed) { 394 nc->peer->info->link_status_changed(nc->peer); 395 } 396 397 for (i = 0; i < queues; i++) { 398 qemu_cleanup_net_client(ncs[i]); 399 } 400 401 return; 402 } 403 404 for (i = 0; i < queues; i++) { 405 qemu_cleanup_net_client(ncs[i]); 406 qemu_free_net_client(ncs[i]); 407 } 408 } 409 410 void qemu_del_nic(NICState *nic) 411 { 412 int i, queues = MAX(nic->conf->peers.queues, 1); 413 414 qemu_macaddr_set_free(&nic->conf->macaddr); 415 416 for (i = 0; i < queues; i++) { 417 NetClientState *nc = qemu_get_subqueue(nic, i); 418 /* If this is a peer NIC and peer has already been deleted, free it now. */ 419 if (nic->peer_deleted) { 420 qemu_free_net_client(nc->peer); 421 } else if (nc->peer) { 422 /* if there are RX packets pending, complete them */ 423 qemu_purge_queued_packets(nc->peer); 424 } 425 } 426 427 for (i = queues - 1; i >= 0; i--) { 428 NetClientState *nc = qemu_get_subqueue(nic, i); 429 430 qemu_cleanup_net_client(nc); 431 qemu_free_net_client(nc); 432 } 433 434 g_free(nic); 435 } 436 437 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 438 { 439 NetClientState *nc; 440 441 QTAILQ_FOREACH(nc, &net_clients, next) { 442 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 443 if (nc->queue_index == 0) { 444 func(qemu_get_nic(nc), opaque); 445 } 446 } 447 } 448 } 449 450 bool qemu_has_ufo(NetClientState *nc) 451 { 452 if (!nc || !nc->info->has_ufo) { 453 return false; 454 } 455 456 return nc->info->has_ufo(nc); 457 } 458 459 bool qemu_has_vnet_hdr(NetClientState *nc) 460 { 461 if (!nc || !nc->info->has_vnet_hdr) { 462 return false; 463 } 464 465 return nc->info->has_vnet_hdr(nc); 466 } 467 468 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 469 { 470 if (!nc || !nc->info->has_vnet_hdr_len) { 471 return false; 472 } 473 474 return nc->info->has_vnet_hdr_len(nc, len); 475 } 476 477 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 478 { 479 if (!nc || !nc->info->using_vnet_hdr) { 480 return; 481 } 482 483 nc->info->using_vnet_hdr(nc, enable); 484 } 485 486 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 487 int ecn, int ufo) 488 { 489 if (!nc || !nc->info->set_offload) { 490 return; 491 } 492 493 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 494 } 495 496 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 497 { 498 if (!nc || !nc->info->set_vnet_hdr_len) { 499 return; 500 } 501 502 nc->vnet_hdr_len = len; 503 nc->info->set_vnet_hdr_len(nc, len); 504 } 505 506 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 507 { 508 #ifdef HOST_WORDS_BIGENDIAN 509 if (!nc || !nc->info->set_vnet_le) { 510 return -ENOSYS; 511 } 512 513 return nc->info->set_vnet_le(nc, is_le); 514 #else 515 return 0; 516 #endif 517 } 518 519 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 520 { 521 #ifdef HOST_WORDS_BIGENDIAN 522 return 0; 523 #else 524 if (!nc || !nc->info->set_vnet_be) { 525 return -ENOSYS; 526 } 527 528 return nc->info->set_vnet_be(nc, is_be); 529 #endif 530 } 531 532 int qemu_can_receive_packet(NetClientState *nc) 533 { 534 if (nc->receive_disabled) { 535 return 0; 536 } else if (nc->info->can_receive && 537 !nc->info->can_receive(nc)) { 538 return 0; 539 } 540 return 1; 541 } 542 543 int qemu_can_send_packet(NetClientState *sender) 544 { 545 int vm_running = runstate_is_running(); 546 547 if (!vm_running) { 548 return 0; 549 } 550 551 if (!sender->peer) { 552 return 1; 553 } 554 555 return qemu_can_receive_packet(sender->peer); 556 } 557 558 static ssize_t filter_receive_iov(NetClientState *nc, 559 NetFilterDirection direction, 560 NetClientState *sender, 561 unsigned flags, 562 const struct iovec *iov, 563 int iovcnt, 564 NetPacketSent *sent_cb) 565 { 566 ssize_t ret = 0; 567 NetFilterState *nf = NULL; 568 569 if (direction == NET_FILTER_DIRECTION_TX) { 570 QTAILQ_FOREACH(nf, &nc->filters, next) { 571 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 572 iovcnt, sent_cb); 573 if (ret) { 574 return ret; 575 } 576 } 577 } else { 578 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 579 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 580 iovcnt, sent_cb); 581 if (ret) { 582 return ret; 583 } 584 } 585 } 586 587 return ret; 588 } 589 590 static ssize_t filter_receive(NetClientState *nc, 591 NetFilterDirection direction, 592 NetClientState *sender, 593 unsigned flags, 594 const uint8_t *data, 595 size_t size, 596 NetPacketSent *sent_cb) 597 { 598 struct iovec iov = { 599 .iov_base = (void *)data, 600 .iov_len = size 601 }; 602 603 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 604 } 605 606 void qemu_purge_queued_packets(NetClientState *nc) 607 { 608 if (!nc->peer) { 609 return; 610 } 611 612 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 613 } 614 615 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 616 { 617 nc->receive_disabled = 0; 618 619 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 620 if (net_hub_flush(nc->peer)) { 621 qemu_notify_event(); 622 } 623 } 624 if (qemu_net_queue_flush(nc->incoming_queue)) { 625 /* We emptied the queue successfully, signal to the IO thread to repoll 626 * the file descriptor (for tap, for example). 627 */ 628 qemu_notify_event(); 629 } else if (purge) { 630 /* Unable to empty the queue, purge remaining packets */ 631 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 632 } 633 } 634 635 void qemu_flush_queued_packets(NetClientState *nc) 636 { 637 qemu_flush_or_purge_queued_packets(nc, false); 638 } 639 640 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 641 unsigned flags, 642 const uint8_t *buf, int size, 643 NetPacketSent *sent_cb) 644 { 645 NetQueue *queue; 646 int ret; 647 648 #ifdef DEBUG_NET 649 printf("qemu_send_packet_async:\n"); 650 qemu_hexdump(stdout, "net", buf, size); 651 #endif 652 653 if (sender->link_down || !sender->peer) { 654 return size; 655 } 656 657 /* Let filters handle the packet first */ 658 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 659 sender, flags, buf, size, sent_cb); 660 if (ret) { 661 return ret; 662 } 663 664 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 665 sender, flags, buf, size, sent_cb); 666 if (ret) { 667 return ret; 668 } 669 670 queue = sender->peer->incoming_queue; 671 672 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 673 } 674 675 ssize_t qemu_send_packet_async(NetClientState *sender, 676 const uint8_t *buf, int size, 677 NetPacketSent *sent_cb) 678 { 679 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 680 buf, size, sent_cb); 681 } 682 683 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 684 { 685 return qemu_send_packet_async(nc, buf, size, NULL); 686 } 687 688 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 689 { 690 if (!qemu_can_receive_packet(nc)) { 691 return 0; 692 } 693 694 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 695 } 696 697 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 698 int iovcnt) 699 { 700 if (!qemu_can_receive_packet(nc)) { 701 return 0; 702 } 703 704 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 705 } 706 707 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 708 { 709 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 710 buf, size, NULL); 711 } 712 713 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 714 int iovcnt, unsigned flags) 715 { 716 uint8_t *buf = NULL; 717 uint8_t *buffer; 718 size_t offset; 719 ssize_t ret; 720 721 if (iovcnt == 1) { 722 buffer = iov[0].iov_base; 723 offset = iov[0].iov_len; 724 } else { 725 offset = iov_size(iov, iovcnt); 726 if (offset > NET_BUFSIZE) { 727 return -1; 728 } 729 buf = g_malloc(offset); 730 buffer = buf; 731 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 732 } 733 734 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 735 ret = nc->info->receive_raw(nc, buffer, offset); 736 } else { 737 ret = nc->info->receive(nc, buffer, offset); 738 } 739 740 g_free(buf); 741 return ret; 742 } 743 744 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 745 unsigned flags, 746 const struct iovec *iov, 747 int iovcnt, 748 void *opaque) 749 { 750 NetClientState *nc = opaque; 751 int ret; 752 753 754 if (nc->link_down) { 755 return iov_size(iov, iovcnt); 756 } 757 758 if (nc->receive_disabled) { 759 return 0; 760 } 761 762 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 763 ret = nc->info->receive_iov(nc, iov, iovcnt); 764 } else { 765 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 766 } 767 768 if (ret == 0) { 769 nc->receive_disabled = 1; 770 } 771 772 return ret; 773 } 774 775 ssize_t qemu_sendv_packet_async(NetClientState *sender, 776 const struct iovec *iov, int iovcnt, 777 NetPacketSent *sent_cb) 778 { 779 NetQueue *queue; 780 size_t size = iov_size(iov, iovcnt); 781 int ret; 782 783 if (size > NET_BUFSIZE) { 784 return size; 785 } 786 787 if (sender->link_down || !sender->peer) { 788 return size; 789 } 790 791 /* Let filters handle the packet first */ 792 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 793 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 794 if (ret) { 795 return ret; 796 } 797 798 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 799 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 800 if (ret) { 801 return ret; 802 } 803 804 queue = sender->peer->incoming_queue; 805 806 return qemu_net_queue_send_iov(queue, sender, 807 QEMU_NET_PACKET_FLAG_NONE, 808 iov, iovcnt, sent_cb); 809 } 810 811 ssize_t 812 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 813 { 814 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 815 } 816 817 NetClientState *qemu_find_netdev(const char *id) 818 { 819 NetClientState *nc; 820 821 QTAILQ_FOREACH(nc, &net_clients, next) { 822 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 823 continue; 824 if (!strcmp(nc->name, id)) { 825 return nc; 826 } 827 } 828 829 return NULL; 830 } 831 832 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 833 NetClientDriver type, int max) 834 { 835 NetClientState *nc; 836 int ret = 0; 837 838 QTAILQ_FOREACH(nc, &net_clients, next) { 839 if (nc->info->type == type) { 840 continue; 841 } 842 if (!id || !strcmp(nc->name, id)) { 843 if (ret < max) { 844 ncs[ret] = nc; 845 } 846 ret++; 847 } 848 } 849 850 return ret; 851 } 852 853 static int nic_get_free_idx(void) 854 { 855 int index; 856 857 for (index = 0; index < MAX_NICS; index++) 858 if (!nd_table[index].used) 859 return index; 860 return -1; 861 } 862 863 int qemu_show_nic_models(const char *arg, const char *const *models) 864 { 865 int i; 866 867 if (!arg || !is_help_option(arg)) { 868 return 0; 869 } 870 871 printf("Supported NIC models:\n"); 872 for (i = 0 ; models[i]; i++) { 873 printf("%s\n", models[i]); 874 } 875 return 1; 876 } 877 878 void qemu_check_nic_model(NICInfo *nd, const char *model) 879 { 880 const char *models[2]; 881 882 models[0] = model; 883 models[1] = NULL; 884 885 if (qemu_show_nic_models(nd->model, models)) 886 exit(0); 887 if (qemu_find_nic_model(nd, models, model) < 0) 888 exit(1); 889 } 890 891 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 892 const char *default_model) 893 { 894 int i; 895 896 if (!nd->model) 897 nd->model = g_strdup(default_model); 898 899 for (i = 0 ; models[i]; i++) { 900 if (strcmp(nd->model, models[i]) == 0) 901 return i; 902 } 903 904 error_report("Unsupported NIC model: %s", nd->model); 905 return -1; 906 } 907 908 static int net_init_nic(const Netdev *netdev, const char *name, 909 NetClientState *peer, Error **errp) 910 { 911 int idx; 912 NICInfo *nd; 913 const NetLegacyNicOptions *nic; 914 915 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 916 nic = &netdev->u.nic; 917 918 idx = nic_get_free_idx(); 919 if (idx == -1 || nb_nics >= MAX_NICS) { 920 error_setg(errp, "too many NICs"); 921 return -1; 922 } 923 924 nd = &nd_table[idx]; 925 926 memset(nd, 0, sizeof(*nd)); 927 928 if (nic->has_netdev) { 929 nd->netdev = qemu_find_netdev(nic->netdev); 930 if (!nd->netdev) { 931 error_setg(errp, "netdev '%s' not found", nic->netdev); 932 return -1; 933 } 934 } else { 935 assert(peer); 936 nd->netdev = peer; 937 } 938 nd->name = g_strdup(name); 939 if (nic->has_model) { 940 nd->model = g_strdup(nic->model); 941 } 942 if (nic->has_addr) { 943 nd->devaddr = g_strdup(nic->addr); 944 } 945 946 if (nic->has_macaddr && 947 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 948 error_setg(errp, "invalid syntax for ethernet address"); 949 return -1; 950 } 951 if (nic->has_macaddr && 952 is_multicast_ether_addr(nd->macaddr.a)) { 953 error_setg(errp, 954 "NIC cannot have multicast MAC address (odd 1st byte)"); 955 return -1; 956 } 957 qemu_macaddr_default_if_unset(&nd->macaddr); 958 959 if (nic->has_vectors) { 960 if (nic->vectors > 0x7ffffff) { 961 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 962 return -1; 963 } 964 nd->nvectors = nic->vectors; 965 } else { 966 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 967 } 968 969 nd->used = 1; 970 nb_nics++; 971 972 return idx; 973 } 974 975 976 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 977 const Netdev *netdev, 978 const char *name, 979 NetClientState *peer, Error **errp) = { 980 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 981 #ifdef CONFIG_SLIRP 982 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 983 #endif 984 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 985 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 986 #ifdef CONFIG_VDE 987 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 988 #endif 989 #ifdef CONFIG_NETMAP 990 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 991 #endif 992 #ifdef CONFIG_NET_BRIDGE 993 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 994 #endif 995 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 996 #ifdef CONFIG_VHOST_NET_USER 997 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 998 #endif 999 #ifdef CONFIG_VHOST_NET_VDPA 1000 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1001 #endif 1002 #ifdef CONFIG_L2TPV3 1003 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1004 #endif 1005 }; 1006 1007 1008 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1009 { 1010 NetClientState *peer = NULL; 1011 NetClientState *nc; 1012 1013 if (is_netdev) { 1014 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1015 !net_client_init_fun[netdev->type]) { 1016 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1017 "a netdev backend type"); 1018 return -1; 1019 } 1020 } else { 1021 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1022 return 0; /* nothing to do */ 1023 } 1024 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 1025 !net_client_init_fun[netdev->type]) { 1026 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1027 "a net backend type (maybe it is not compiled " 1028 "into this binary)"); 1029 return -1; 1030 } 1031 1032 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1033 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1034 !netdev->u.nic.has_netdev) { 1035 peer = net_hub_add_port(0, NULL, NULL); 1036 } 1037 } 1038 1039 nc = qemu_find_netdev(netdev->id); 1040 if (nc) { 1041 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1042 return -1; 1043 } 1044 1045 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1046 /* FIXME drop when all init functions store an Error */ 1047 if (errp && !*errp) { 1048 error_setg(errp, "Device '%s' could not be initialized", 1049 NetClientDriver_str(netdev->type)); 1050 } 1051 return -1; 1052 } 1053 1054 if (is_netdev) { 1055 nc = qemu_find_netdev(netdev->id); 1056 assert(nc); 1057 nc->is_netdev = true; 1058 } 1059 1060 return 0; 1061 } 1062 1063 void show_netdevs(void) 1064 { 1065 int idx; 1066 const char *available_netdevs[] = { 1067 "socket", 1068 "hubport", 1069 "tap", 1070 #ifdef CONFIG_SLIRP 1071 "user", 1072 #endif 1073 #ifdef CONFIG_L2TPV3 1074 "l2tpv3", 1075 #endif 1076 #ifdef CONFIG_VDE 1077 "vde", 1078 #endif 1079 #ifdef CONFIG_NET_BRIDGE 1080 "bridge", 1081 #endif 1082 #ifdef CONFIG_NETMAP 1083 "netmap", 1084 #endif 1085 #ifdef CONFIG_POSIX 1086 "vhost-user", 1087 #endif 1088 #ifdef CONFIG_VHOST_VDPA 1089 "vhost-vdpa", 1090 #endif 1091 }; 1092 1093 qemu_printf("Available netdev backend types:\n"); 1094 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1095 qemu_printf("%s\n", available_netdevs[idx]); 1096 } 1097 } 1098 1099 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1100 { 1101 gchar **substrings = NULL; 1102 Netdev *object = NULL; 1103 int ret = -1; 1104 Visitor *v = opts_visitor_new(opts); 1105 1106 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1107 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1108 1109 if (ip6_net) { 1110 char *prefix_addr; 1111 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1112 1113 substrings = g_strsplit(ip6_net, "/", 2); 1114 if (!substrings || !substrings[0]) { 1115 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1116 "a valid IPv6 prefix"); 1117 goto out; 1118 } 1119 1120 prefix_addr = substrings[0]; 1121 1122 /* Handle user-specified prefix length. */ 1123 if (substrings[1] && 1124 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1125 { 1126 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1127 "ipv6-prefixlen", "a number"); 1128 goto out; 1129 } 1130 1131 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1132 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1133 &error_abort); 1134 qemu_opt_unset(opts, "ipv6-net"); 1135 } 1136 1137 /* Create an ID for -net if the user did not specify one */ 1138 if (!is_netdev && !qemu_opts_id(opts)) { 1139 qemu_opts_set_id(opts, id_generate(ID_NET)); 1140 } 1141 1142 if (visit_type_Netdev(v, NULL, &object, errp)) { 1143 ret = net_client_init1(object, is_netdev, errp); 1144 } 1145 1146 qapi_free_Netdev(object); 1147 1148 out: 1149 g_strfreev(substrings); 1150 visit_free(v); 1151 return ret; 1152 } 1153 1154 void netdev_add(QemuOpts *opts, Error **errp) 1155 { 1156 net_client_init(opts, true, errp); 1157 } 1158 1159 void qmp_netdev_add(Netdev *netdev, Error **errp) 1160 { 1161 if (!id_wellformed(netdev->id)) { 1162 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1163 return; 1164 } 1165 1166 net_client_init1(netdev, true, errp); 1167 } 1168 1169 void qmp_netdev_del(const char *id, Error **errp) 1170 { 1171 NetClientState *nc; 1172 QemuOpts *opts; 1173 1174 nc = qemu_find_netdev(id); 1175 if (!nc) { 1176 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1177 "Device '%s' not found", id); 1178 return; 1179 } 1180 1181 if (!nc->is_netdev) { 1182 error_setg(errp, "Device '%s' is not a netdev", id); 1183 return; 1184 } 1185 1186 qemu_del_net_client(nc); 1187 1188 /* 1189 * Wart: we need to delete the QemuOpts associated with netdevs 1190 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1191 * HMP netdev_add. 1192 */ 1193 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1194 if (opts) { 1195 qemu_opts_del(opts); 1196 } 1197 } 1198 1199 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1200 { 1201 char *str; 1202 ObjectProperty *prop; 1203 ObjectPropertyIterator iter; 1204 Visitor *v; 1205 1206 /* generate info str */ 1207 object_property_iter_init(&iter, OBJECT(nf)); 1208 while ((prop = object_property_iter_next(&iter))) { 1209 if (!strcmp(prop->name, "type")) { 1210 continue; 1211 } 1212 v = string_output_visitor_new(false, &str); 1213 object_property_get(OBJECT(nf), prop->name, v, NULL); 1214 visit_complete(v, &str); 1215 visit_free(v); 1216 monitor_printf(mon, ",%s=%s", prop->name, str); 1217 g_free(str); 1218 } 1219 monitor_printf(mon, "\n"); 1220 } 1221 1222 void print_net_client(Monitor *mon, NetClientState *nc) 1223 { 1224 NetFilterState *nf; 1225 1226 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1227 nc->queue_index, 1228 NetClientDriver_str(nc->info->type), 1229 nc->info_str); 1230 if (!QTAILQ_EMPTY(&nc->filters)) { 1231 monitor_printf(mon, "filters:\n"); 1232 } 1233 QTAILQ_FOREACH(nf, &nc->filters, next) { 1234 monitor_printf(mon, " - %s: type=%s", 1235 object_get_canonical_path_component(OBJECT(nf)), 1236 object_get_typename(OBJECT(nf))); 1237 netfilter_print_info(mon, nf); 1238 } 1239 } 1240 1241 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1242 Error **errp) 1243 { 1244 NetClientState *nc; 1245 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1246 1247 QTAILQ_FOREACH(nc, &net_clients, next) { 1248 RxFilterInfo *info; 1249 1250 if (has_name && strcmp(nc->name, name) != 0) { 1251 continue; 1252 } 1253 1254 /* only query rx-filter information of NIC */ 1255 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1256 if (has_name) { 1257 error_setg(errp, "net client(%s) isn't a NIC", name); 1258 assert(!filter_list); 1259 return NULL; 1260 } 1261 continue; 1262 } 1263 1264 /* only query information on queue 0 since the info is per nic, 1265 * not per queue 1266 */ 1267 if (nc->queue_index != 0) 1268 continue; 1269 1270 if (nc->info->query_rx_filter) { 1271 info = nc->info->query_rx_filter(nc); 1272 QAPI_LIST_APPEND(tail, info); 1273 } else if (has_name) { 1274 error_setg(errp, "net client(%s) doesn't support" 1275 " rx-filter querying", name); 1276 assert(!filter_list); 1277 return NULL; 1278 } 1279 1280 if (has_name) { 1281 break; 1282 } 1283 } 1284 1285 if (filter_list == NULL && has_name) { 1286 error_setg(errp, "invalid net client name: %s", name); 1287 } 1288 1289 return filter_list; 1290 } 1291 1292 void hmp_info_network(Monitor *mon, const QDict *qdict) 1293 { 1294 NetClientState *nc, *peer; 1295 NetClientDriver type; 1296 1297 net_hub_info(mon); 1298 1299 QTAILQ_FOREACH(nc, &net_clients, next) { 1300 peer = nc->peer; 1301 type = nc->info->type; 1302 1303 /* Skip if already printed in hub info */ 1304 if (net_hub_id_for_client(nc, NULL) == 0) { 1305 continue; 1306 } 1307 1308 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1309 print_net_client(mon, nc); 1310 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1311 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1312 monitor_printf(mon, " \\ "); 1313 print_net_client(mon, peer); 1314 } 1315 } 1316 } 1317 1318 void colo_notify_filters_event(int event, Error **errp) 1319 { 1320 NetClientState *nc; 1321 NetFilterState *nf; 1322 NetFilterClass *nfc = NULL; 1323 Error *local_err = NULL; 1324 1325 QTAILQ_FOREACH(nc, &net_clients, next) { 1326 QTAILQ_FOREACH(nf, &nc->filters, next) { 1327 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1328 nfc->handle_event(nf, event, &local_err); 1329 if (local_err) { 1330 error_propagate(errp, local_err); 1331 return; 1332 } 1333 } 1334 } 1335 } 1336 1337 void qmp_set_link(const char *name, bool up, Error **errp) 1338 { 1339 NetClientState *ncs[MAX_QUEUE_NUM]; 1340 NetClientState *nc; 1341 int queues, i; 1342 1343 queues = qemu_find_net_clients_except(name, ncs, 1344 NET_CLIENT_DRIVER__MAX, 1345 MAX_QUEUE_NUM); 1346 1347 if (queues == 0) { 1348 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1349 "Device '%s' not found", name); 1350 return; 1351 } 1352 nc = ncs[0]; 1353 1354 for (i = 0; i < queues; i++) { 1355 ncs[i]->link_down = !up; 1356 } 1357 1358 if (nc->info->link_status_changed) { 1359 nc->info->link_status_changed(nc); 1360 } 1361 1362 if (nc->peer) { 1363 /* Change peer link only if the peer is NIC and then notify peer. 1364 * If the peer is a HUBPORT or a backend, we do not change the 1365 * link status. 1366 * 1367 * This behavior is compatible with qemu hubs where there could be 1368 * multiple clients that can still communicate with each other in 1369 * disconnected mode. For now maintain this compatibility. 1370 */ 1371 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1372 for (i = 0; i < queues; i++) { 1373 ncs[i]->peer->link_down = !up; 1374 } 1375 } 1376 if (nc->peer->info->link_status_changed) { 1377 nc->peer->info->link_status_changed(nc->peer); 1378 } 1379 } 1380 } 1381 1382 static void net_vm_change_state_handler(void *opaque, bool running, 1383 RunState state) 1384 { 1385 NetClientState *nc; 1386 NetClientState *tmp; 1387 1388 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1389 if (running) { 1390 /* Flush queued packets and wake up backends. */ 1391 if (nc->peer && qemu_can_send_packet(nc)) { 1392 qemu_flush_queued_packets(nc->peer); 1393 } 1394 } else { 1395 /* Complete all queued packets, to guarantee we don't modify 1396 * state later when VM is not running. 1397 */ 1398 qemu_flush_or_purge_queued_packets(nc, true); 1399 } 1400 } 1401 } 1402 1403 void net_cleanup(void) 1404 { 1405 NetClientState *nc; 1406 1407 /* We may del multiple entries during qemu_del_net_client(), 1408 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1409 */ 1410 while (!QTAILQ_EMPTY(&net_clients)) { 1411 nc = QTAILQ_FIRST(&net_clients); 1412 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1413 qemu_del_nic(qemu_get_nic(nc)); 1414 } else { 1415 qemu_del_net_client(nc); 1416 } 1417 } 1418 1419 qemu_del_vm_change_state_handler(net_change_state_entry); 1420 } 1421 1422 void net_check_clients(void) 1423 { 1424 NetClientState *nc; 1425 int i; 1426 1427 net_hub_check_clients(); 1428 1429 QTAILQ_FOREACH(nc, &net_clients, next) { 1430 if (!nc->peer) { 1431 warn_report("%s %s has no peer", 1432 nc->info->type == NET_CLIENT_DRIVER_NIC 1433 ? "nic" : "netdev", 1434 nc->name); 1435 } 1436 } 1437 1438 /* Check that all NICs requested via -net nic actually got created. 1439 * NICs created via -device don't need to be checked here because 1440 * they are always instantiated. 1441 */ 1442 for (i = 0; i < MAX_NICS; i++) { 1443 NICInfo *nd = &nd_table[i]; 1444 if (nd->used && !nd->instantiated) { 1445 warn_report("requested NIC (%s, model %s) " 1446 "was not created (not supported by this machine?)", 1447 nd->name ? nd->name : "anonymous", 1448 nd->model ? nd->model : "unspecified"); 1449 } 1450 } 1451 } 1452 1453 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1454 { 1455 return net_client_init(opts, false, errp); 1456 } 1457 1458 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1459 { 1460 const char *type = qemu_opt_get(opts, "type"); 1461 1462 if (type && is_help_option(type)) { 1463 show_netdevs(); 1464 exit(0); 1465 } 1466 return net_client_init(opts, true, errp); 1467 } 1468 1469 /* For the convenience "--nic" parameter */ 1470 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1471 { 1472 char *mac, *nd_id; 1473 int idx, ret; 1474 NICInfo *ni; 1475 const char *type; 1476 1477 type = qemu_opt_get(opts, "type"); 1478 if (type && g_str_equal(type, "none")) { 1479 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1480 } 1481 1482 idx = nic_get_free_idx(); 1483 if (idx == -1 || nb_nics >= MAX_NICS) { 1484 error_setg(errp, "no more on-board/default NIC slots available"); 1485 return -1; 1486 } 1487 1488 if (!type) { 1489 qemu_opt_set(opts, "type", "user", &error_abort); 1490 } 1491 1492 ni = &nd_table[idx]; 1493 memset(ni, 0, sizeof(*ni)); 1494 ni->model = qemu_opt_get_del(opts, "model"); 1495 1496 /* Create an ID if the user did not specify one */ 1497 nd_id = g_strdup(qemu_opts_id(opts)); 1498 if (!nd_id) { 1499 nd_id = id_generate(ID_NET); 1500 qemu_opts_set_id(opts, nd_id); 1501 } 1502 1503 /* Handle MAC address */ 1504 mac = qemu_opt_get_del(opts, "mac"); 1505 if (mac) { 1506 ret = net_parse_macaddr(ni->macaddr.a, mac); 1507 g_free(mac); 1508 if (ret) { 1509 error_setg(errp, "invalid syntax for ethernet address"); 1510 goto out; 1511 } 1512 if (is_multicast_ether_addr(ni->macaddr.a)) { 1513 error_setg(errp, "NIC cannot have multicast MAC address"); 1514 ret = -1; 1515 goto out; 1516 } 1517 } 1518 qemu_macaddr_default_if_unset(&ni->macaddr); 1519 1520 ret = net_client_init(opts, true, errp); 1521 if (ret == 0) { 1522 ni->netdev = qemu_find_netdev(nd_id); 1523 ni->used = true; 1524 nb_nics++; 1525 } 1526 1527 out: 1528 g_free(nd_id); 1529 return ret; 1530 } 1531 1532 int net_init_clients(Error **errp) 1533 { 1534 net_change_state_entry = 1535 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1536 1537 QTAILQ_INIT(&net_clients); 1538 1539 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1540 net_init_netdev, NULL, errp)) { 1541 return -1; 1542 } 1543 1544 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1545 return -1; 1546 } 1547 1548 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1549 return -1; 1550 } 1551 1552 return 0; 1553 } 1554 1555 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1556 { 1557 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1558 return -1; 1559 } 1560 1561 return 0; 1562 } 1563 1564 /* From FreeBSD */ 1565 /* XXX: optimize */ 1566 uint32_t net_crc32(const uint8_t *p, int len) 1567 { 1568 uint32_t crc; 1569 int carry, i, j; 1570 uint8_t b; 1571 1572 crc = 0xffffffff; 1573 for (i = 0; i < len; i++) { 1574 b = *p++; 1575 for (j = 0; j < 8; j++) { 1576 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1577 crc <<= 1; 1578 b >>= 1; 1579 if (carry) { 1580 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1581 } 1582 } 1583 } 1584 1585 return crc; 1586 } 1587 1588 uint32_t net_crc32_le(const uint8_t *p, int len) 1589 { 1590 uint32_t crc; 1591 int carry, i, j; 1592 uint8_t b; 1593 1594 crc = 0xffffffff; 1595 for (i = 0; i < len; i++) { 1596 b = *p++; 1597 for (j = 0; j < 8; j++) { 1598 carry = (crc & 0x1) ^ (b & 0x01); 1599 crc >>= 1; 1600 b >>= 1; 1601 if (carry) { 1602 crc ^= POLYNOMIAL_LE; 1603 } 1604 } 1605 } 1606 1607 return crc; 1608 } 1609 1610 QemuOptsList qemu_netdev_opts = { 1611 .name = "netdev", 1612 .implied_opt_name = "type", 1613 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1614 .desc = { 1615 /* 1616 * no elements => accept any params 1617 * validation will happen later 1618 */ 1619 { /* end of list */ } 1620 }, 1621 }; 1622 1623 QemuOptsList qemu_nic_opts = { 1624 .name = "nic", 1625 .implied_opt_name = "type", 1626 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1627 .desc = { 1628 /* 1629 * no elements => accept any params 1630 * validation will happen later 1631 */ 1632 { /* end of list */ } 1633 }, 1634 }; 1635 1636 QemuOptsList qemu_net_opts = { 1637 .name = "net", 1638 .implied_opt_name = "type", 1639 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1640 .desc = { 1641 /* 1642 * no elements => accept any params 1643 * validation will happen later 1644 */ 1645 { /* end of list */ } 1646 }, 1647 }; 1648 1649 void net_socket_rs_init(SocketReadState *rs, 1650 SocketReadStateFinalize *finalize, 1651 bool vnet_hdr) 1652 { 1653 rs->state = 0; 1654 rs->vnet_hdr = vnet_hdr; 1655 rs->index = 0; 1656 rs->packet_len = 0; 1657 rs->vnet_hdr_len = 0; 1658 memset(rs->buf, 0, sizeof(rs->buf)); 1659 rs->finalize = finalize; 1660 } 1661 1662 /* 1663 * Returns 1664 * 0: success 1665 * -1: error occurs 1666 */ 1667 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1668 { 1669 unsigned int l; 1670 1671 while (size > 0) { 1672 /* Reassemble a packet from the network. 1673 * 0 = getting length. 1674 * 1 = getting vnet header length. 1675 * 2 = getting data. 1676 */ 1677 switch (rs->state) { 1678 case 0: 1679 l = 4 - rs->index; 1680 if (l > size) { 1681 l = size; 1682 } 1683 memcpy(rs->buf + rs->index, buf, l); 1684 buf += l; 1685 size -= l; 1686 rs->index += l; 1687 if (rs->index == 4) { 1688 /* got length */ 1689 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1690 rs->index = 0; 1691 if (rs->vnet_hdr) { 1692 rs->state = 1; 1693 } else { 1694 rs->state = 2; 1695 rs->vnet_hdr_len = 0; 1696 } 1697 } 1698 break; 1699 case 1: 1700 l = 4 - rs->index; 1701 if (l > size) { 1702 l = size; 1703 } 1704 memcpy(rs->buf + rs->index, buf, l); 1705 buf += l; 1706 size -= l; 1707 rs->index += l; 1708 if (rs->index == 4) { 1709 /* got vnet header length */ 1710 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1711 rs->index = 0; 1712 rs->state = 2; 1713 } 1714 break; 1715 case 2: 1716 l = rs->packet_len - rs->index; 1717 if (l > size) { 1718 l = size; 1719 } 1720 if (rs->index + l <= sizeof(rs->buf)) { 1721 memcpy(rs->buf + rs->index, buf, l); 1722 } else { 1723 fprintf(stderr, "serious error: oversized packet received," 1724 "connection terminated.\n"); 1725 rs->index = rs->state = 0; 1726 return -1; 1727 } 1728 1729 rs->index += l; 1730 buf += l; 1731 size -= l; 1732 if (rs->index >= rs->packet_len) { 1733 rs->index = 0; 1734 rs->state = 0; 1735 assert(rs->finalize); 1736 rs->finalize(rs); 1737 } 1738 break; 1739 } 1740 } 1741 1742 assert(size == 0); 1743 return 0; 1744 } 1745