1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #include "config-host.h" 25 26 #include "net/net.h" 27 #include "clients.h" 28 #include "hub.h" 29 #include "net/slirp.h" 30 #include "net/eth.h" 31 #include "util.h" 32 33 #include "monitor/monitor.h" 34 #include "qemu-common.h" 35 #include "qapi/qmp/qerror.h" 36 #include "qemu/error-report.h" 37 #include "qemu/sockets.h" 38 #include "qemu/config-file.h" 39 #include "qmp-commands.h" 40 #include "hw/qdev.h" 41 #include "qemu/iov.h" 42 #include "qemu/main-loop.h" 43 #include "qapi-visit.h" 44 #include "qapi/opts-visitor.h" 45 #include "qapi/dealloc-visitor.h" 46 #include "sysemu/sysemu.h" 47 #include "net/filter.h" 48 49 /* Net bridge is currently not supported for W32. */ 50 #if !defined(_WIN32) 51 # define CONFIG_NET_BRIDGE 52 #endif 53 54 static VMChangeStateEntry *net_change_state_entry; 55 static QTAILQ_HEAD(, NetClientState) net_clients; 56 57 const char *host_net_devices[] = { 58 "tap", 59 "socket", 60 "dump", 61 #ifdef CONFIG_NET_BRIDGE 62 "bridge", 63 #endif 64 #ifdef CONFIG_NETMAP 65 "netmap", 66 #endif 67 #ifdef CONFIG_SLIRP 68 "user", 69 #endif 70 #ifdef CONFIG_VDE 71 "vde", 72 #endif 73 "vhost-user", 74 NULL, 75 }; 76 77 int default_net = 1; 78 79 /***********************************************************/ 80 /* network device redirectors */ 81 82 #if defined(DEBUG_NET) 83 static void hex_dump(FILE *f, const uint8_t *buf, int size) 84 { 85 int len, i, j, c; 86 87 for(i=0;i<size;i+=16) { 88 len = size - i; 89 if (len > 16) 90 len = 16; 91 fprintf(f, "%08x ", i); 92 for(j=0;j<16;j++) { 93 if (j < len) 94 fprintf(f, " %02x", buf[i+j]); 95 else 96 fprintf(f, " "); 97 } 98 fprintf(f, " "); 99 for(j=0;j<len;j++) { 100 c = buf[i+j]; 101 if (c < ' ' || c > '~') 102 c = '.'; 103 fprintf(f, "%c", c); 104 } 105 fprintf(f, "\n"); 106 } 107 } 108 #endif 109 110 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 111 { 112 const char *p, *p1; 113 int len; 114 p = *pp; 115 p1 = strchr(p, sep); 116 if (!p1) 117 return -1; 118 len = p1 - p; 119 p1++; 120 if (buf_size > 0) { 121 if (len > buf_size - 1) 122 len = buf_size - 1; 123 memcpy(buf, p, len); 124 buf[len] = '\0'; 125 } 126 *pp = p1; 127 return 0; 128 } 129 130 int parse_host_port(struct sockaddr_in *saddr, const char *str) 131 { 132 char buf[512]; 133 struct hostent *he; 134 const char *p, *r; 135 int port; 136 137 p = str; 138 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) 139 return -1; 140 saddr->sin_family = AF_INET; 141 if (buf[0] == '\0') { 142 saddr->sin_addr.s_addr = 0; 143 } else { 144 if (qemu_isdigit(buf[0])) { 145 if (!inet_aton(buf, &saddr->sin_addr)) 146 return -1; 147 } else { 148 if ((he = gethostbyname(buf)) == NULL) 149 return - 1; 150 saddr->sin_addr = *(struct in_addr *)he->h_addr; 151 } 152 } 153 port = strtol(p, (char **)&r, 0); 154 if (r == p) 155 return -1; 156 saddr->sin_port = htons(port); 157 return 0; 158 } 159 160 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 161 { 162 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 163 macaddr[0], macaddr[1], macaddr[2], 164 macaddr[3], macaddr[4], macaddr[5]); 165 } 166 167 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 168 { 169 snprintf(nc->info_str, sizeof(nc->info_str), 170 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 171 nc->model, 172 macaddr[0], macaddr[1], macaddr[2], 173 macaddr[3], macaddr[4], macaddr[5]); 174 } 175 176 static int mac_table[256] = {0}; 177 178 static void qemu_macaddr_set_used(MACAddr *macaddr) 179 { 180 int index; 181 182 for (index = 0x56; index < 0xFF; index++) { 183 if (macaddr->a[5] == index) { 184 mac_table[index]++; 185 } 186 } 187 } 188 189 static void qemu_macaddr_set_free(MACAddr *macaddr) 190 { 191 int index; 192 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 193 194 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 195 return; 196 } 197 for (index = 0x56; index < 0xFF; index++) { 198 if (macaddr->a[5] == index) { 199 mac_table[index]--; 200 } 201 } 202 } 203 204 static int qemu_macaddr_get_free(void) 205 { 206 int index; 207 208 for (index = 0x56; index < 0xFF; index++) { 209 if (mac_table[index] == 0) { 210 return index; 211 } 212 } 213 214 return -1; 215 } 216 217 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 218 { 219 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 220 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 221 222 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 223 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 224 return; 225 } else { 226 qemu_macaddr_set_used(macaddr); 227 return; 228 } 229 } 230 231 macaddr->a[0] = 0x52; 232 macaddr->a[1] = 0x54; 233 macaddr->a[2] = 0x00; 234 macaddr->a[3] = 0x12; 235 macaddr->a[4] = 0x34; 236 macaddr->a[5] = qemu_macaddr_get_free(); 237 qemu_macaddr_set_used(macaddr); 238 } 239 240 /** 241 * Generate a name for net client 242 * 243 * Only net clients created with the legacy -net option and NICs need this. 244 */ 245 static char *assign_name(NetClientState *nc1, const char *model) 246 { 247 NetClientState *nc; 248 int id = 0; 249 250 QTAILQ_FOREACH(nc, &net_clients, next) { 251 if (nc == nc1) { 252 continue; 253 } 254 if (strcmp(nc->model, model) == 0) { 255 id++; 256 } 257 } 258 259 return g_strdup_printf("%s.%d", model, id); 260 } 261 262 static void qemu_net_client_destructor(NetClientState *nc) 263 { 264 g_free(nc); 265 } 266 267 static void qemu_net_client_setup(NetClientState *nc, 268 NetClientInfo *info, 269 NetClientState *peer, 270 const char *model, 271 const char *name, 272 NetClientDestructor *destructor) 273 { 274 nc->info = info; 275 nc->model = g_strdup(model); 276 if (name) { 277 nc->name = g_strdup(name); 278 } else { 279 nc->name = assign_name(nc, model); 280 } 281 282 if (peer) { 283 assert(!peer->peer); 284 nc->peer = peer; 285 peer->peer = nc; 286 } 287 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 288 289 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 290 nc->destructor = destructor; 291 QTAILQ_INIT(&nc->filters); 292 } 293 294 NetClientState *qemu_new_net_client(NetClientInfo *info, 295 NetClientState *peer, 296 const char *model, 297 const char *name) 298 { 299 NetClientState *nc; 300 301 assert(info->size >= sizeof(NetClientState)); 302 303 nc = g_malloc0(info->size); 304 qemu_net_client_setup(nc, info, peer, model, name, 305 qemu_net_client_destructor); 306 307 return nc; 308 } 309 310 NICState *qemu_new_nic(NetClientInfo *info, 311 NICConf *conf, 312 const char *model, 313 const char *name, 314 void *opaque) 315 { 316 NetClientState **peers = conf->peers.ncs; 317 NICState *nic; 318 int i, queues = MAX(1, conf->peers.queues); 319 320 assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC); 321 assert(info->size >= sizeof(NICState)); 322 323 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 324 nic->ncs = (void *)nic + info->size; 325 nic->conf = conf; 326 nic->opaque = opaque; 327 328 for (i = 0; i < queues; i++) { 329 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 330 NULL); 331 nic->ncs[i].queue_index = i; 332 } 333 334 return nic; 335 } 336 337 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 338 { 339 return nic->ncs + queue_index; 340 } 341 342 NetClientState *qemu_get_queue(NICState *nic) 343 { 344 return qemu_get_subqueue(nic, 0); 345 } 346 347 NICState *qemu_get_nic(NetClientState *nc) 348 { 349 NetClientState *nc0 = nc - nc->queue_index; 350 351 return (NICState *)((void *)nc0 - nc->info->size); 352 } 353 354 void *qemu_get_nic_opaque(NetClientState *nc) 355 { 356 NICState *nic = qemu_get_nic(nc); 357 358 return nic->opaque; 359 } 360 361 static void qemu_cleanup_net_client(NetClientState *nc) 362 { 363 QTAILQ_REMOVE(&net_clients, nc, next); 364 365 if (nc->info->cleanup) { 366 nc->info->cleanup(nc); 367 } 368 } 369 370 static void qemu_free_net_client(NetClientState *nc) 371 { 372 if (nc->incoming_queue) { 373 qemu_del_net_queue(nc->incoming_queue); 374 } 375 if (nc->peer) { 376 nc->peer->peer = NULL; 377 } 378 g_free(nc->name); 379 g_free(nc->model); 380 if (nc->destructor) { 381 nc->destructor(nc); 382 } 383 } 384 385 void qemu_del_net_client(NetClientState *nc) 386 { 387 NetClientState *ncs[MAX_QUEUE_NUM]; 388 int queues, i; 389 NetFilterState *nf, *next; 390 391 assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC); 392 393 /* If the NetClientState belongs to a multiqueue backend, we will change all 394 * other NetClientStates also. 395 */ 396 queues = qemu_find_net_clients_except(nc->name, ncs, 397 NET_CLIENT_OPTIONS_KIND_NIC, 398 MAX_QUEUE_NUM); 399 assert(queues != 0); 400 401 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 402 object_unparent(OBJECT(nf)); 403 } 404 405 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 406 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 407 NICState *nic = qemu_get_nic(nc->peer); 408 if (nic->peer_deleted) { 409 return; 410 } 411 nic->peer_deleted = true; 412 413 for (i = 0; i < queues; i++) { 414 ncs[i]->peer->link_down = true; 415 } 416 417 if (nc->peer->info->link_status_changed) { 418 nc->peer->info->link_status_changed(nc->peer); 419 } 420 421 for (i = 0; i < queues; i++) { 422 qemu_cleanup_net_client(ncs[i]); 423 } 424 425 return; 426 } 427 428 for (i = 0; i < queues; i++) { 429 qemu_cleanup_net_client(ncs[i]); 430 qemu_free_net_client(ncs[i]); 431 } 432 } 433 434 void qemu_del_nic(NICState *nic) 435 { 436 int i, queues = MAX(nic->conf->peers.queues, 1); 437 438 qemu_macaddr_set_free(&nic->conf->macaddr); 439 440 /* If this is a peer NIC and peer has already been deleted, free it now. */ 441 if (nic->peer_deleted) { 442 for (i = 0; i < queues; i++) { 443 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer); 444 } 445 } 446 447 for (i = queues - 1; i >= 0; i--) { 448 NetClientState *nc = qemu_get_subqueue(nic, i); 449 450 qemu_cleanup_net_client(nc); 451 qemu_free_net_client(nc); 452 } 453 454 g_free(nic); 455 } 456 457 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 458 { 459 NetClientState *nc; 460 461 QTAILQ_FOREACH(nc, &net_clients, next) { 462 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 463 if (nc->queue_index == 0) { 464 func(qemu_get_nic(nc), opaque); 465 } 466 } 467 } 468 } 469 470 bool qemu_has_ufo(NetClientState *nc) 471 { 472 if (!nc || !nc->info->has_ufo) { 473 return false; 474 } 475 476 return nc->info->has_ufo(nc); 477 } 478 479 bool qemu_has_vnet_hdr(NetClientState *nc) 480 { 481 if (!nc || !nc->info->has_vnet_hdr) { 482 return false; 483 } 484 485 return nc->info->has_vnet_hdr(nc); 486 } 487 488 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 489 { 490 if (!nc || !nc->info->has_vnet_hdr_len) { 491 return false; 492 } 493 494 return nc->info->has_vnet_hdr_len(nc, len); 495 } 496 497 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 498 { 499 if (!nc || !nc->info->using_vnet_hdr) { 500 return; 501 } 502 503 nc->info->using_vnet_hdr(nc, enable); 504 } 505 506 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 507 int ecn, int ufo) 508 { 509 if (!nc || !nc->info->set_offload) { 510 return; 511 } 512 513 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 514 } 515 516 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 517 { 518 if (!nc || !nc->info->set_vnet_hdr_len) { 519 return; 520 } 521 522 nc->info->set_vnet_hdr_len(nc, len); 523 } 524 525 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 526 { 527 #ifdef HOST_WORDS_BIGENDIAN 528 if (!nc || !nc->info->set_vnet_le) { 529 return -ENOSYS; 530 } 531 532 return nc->info->set_vnet_le(nc, is_le); 533 #else 534 return 0; 535 #endif 536 } 537 538 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 539 { 540 #ifdef HOST_WORDS_BIGENDIAN 541 return 0; 542 #else 543 if (!nc || !nc->info->set_vnet_be) { 544 return -ENOSYS; 545 } 546 547 return nc->info->set_vnet_be(nc, is_be); 548 #endif 549 } 550 551 int qemu_can_send_packet(NetClientState *sender) 552 { 553 int vm_running = runstate_is_running(); 554 555 if (!vm_running) { 556 return 0; 557 } 558 559 if (!sender->peer) { 560 return 1; 561 } 562 563 if (sender->peer->receive_disabled) { 564 return 0; 565 } else if (sender->peer->info->can_receive && 566 !sender->peer->info->can_receive(sender->peer)) { 567 return 0; 568 } 569 return 1; 570 } 571 572 static ssize_t filter_receive_iov(NetClientState *nc, 573 NetFilterDirection direction, 574 NetClientState *sender, 575 unsigned flags, 576 const struct iovec *iov, 577 int iovcnt, 578 NetPacketSent *sent_cb) 579 { 580 ssize_t ret = 0; 581 NetFilterState *nf = NULL; 582 583 QTAILQ_FOREACH(nf, &nc->filters, next) { 584 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 585 iovcnt, sent_cb); 586 if (ret) { 587 return ret; 588 } 589 } 590 591 return ret; 592 } 593 594 static ssize_t filter_receive(NetClientState *nc, 595 NetFilterDirection direction, 596 NetClientState *sender, 597 unsigned flags, 598 const uint8_t *data, 599 size_t size, 600 NetPacketSent *sent_cb) 601 { 602 struct iovec iov = { 603 .iov_base = (void *)data, 604 .iov_len = size 605 }; 606 607 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 608 } 609 610 void qemu_purge_queued_packets(NetClientState *nc) 611 { 612 if (!nc->peer) { 613 return; 614 } 615 616 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 617 } 618 619 static 620 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 621 { 622 nc->receive_disabled = 0; 623 624 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) { 625 if (net_hub_flush(nc->peer)) { 626 qemu_notify_event(); 627 } 628 } 629 if (qemu_net_queue_flush(nc->incoming_queue)) { 630 /* We emptied the queue successfully, signal to the IO thread to repoll 631 * the file descriptor (for tap, for example). 632 */ 633 qemu_notify_event(); 634 } else if (purge) { 635 /* Unable to empty the queue, purge remaining packets */ 636 qemu_net_queue_purge(nc->incoming_queue, nc); 637 } 638 } 639 640 void qemu_flush_queued_packets(NetClientState *nc) 641 { 642 qemu_flush_or_purge_queued_packets(nc, false); 643 } 644 645 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 646 unsigned flags, 647 const uint8_t *buf, int size, 648 NetPacketSent *sent_cb) 649 { 650 NetQueue *queue; 651 int ret; 652 653 #ifdef DEBUG_NET 654 printf("qemu_send_packet_async:\n"); 655 hex_dump(stdout, buf, size); 656 #endif 657 658 if (sender->link_down || !sender->peer) { 659 return size; 660 } 661 662 /* Let filters handle the packet first */ 663 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 664 sender, flags, buf, size, sent_cb); 665 if (ret) { 666 return ret; 667 } 668 669 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 670 sender, flags, buf, size, sent_cb); 671 if (ret) { 672 return ret; 673 } 674 675 queue = sender->peer->incoming_queue; 676 677 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 678 } 679 680 ssize_t qemu_send_packet_async(NetClientState *sender, 681 const uint8_t *buf, int size, 682 NetPacketSent *sent_cb) 683 { 684 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 685 buf, size, sent_cb); 686 } 687 688 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 689 { 690 qemu_send_packet_async(nc, buf, size, NULL); 691 } 692 693 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 694 { 695 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 696 buf, size, NULL); 697 } 698 699 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 700 int iovcnt, unsigned flags) 701 { 702 uint8_t buf[NET_BUFSIZE]; 703 uint8_t *buffer; 704 size_t offset; 705 706 if (iovcnt == 1) { 707 buffer = iov[0].iov_base; 708 offset = iov[0].iov_len; 709 } else { 710 buffer = buf; 711 offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer)); 712 } 713 714 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 715 return nc->info->receive_raw(nc, buffer, offset); 716 } else { 717 return nc->info->receive(nc, buffer, offset); 718 } 719 } 720 721 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 722 unsigned flags, 723 const struct iovec *iov, 724 int iovcnt, 725 void *opaque) 726 { 727 NetClientState *nc = opaque; 728 int ret; 729 730 if (nc->link_down) { 731 return iov_size(iov, iovcnt); 732 } 733 734 if (nc->receive_disabled) { 735 return 0; 736 } 737 738 if (nc->info->receive_iov) { 739 ret = nc->info->receive_iov(nc, iov, iovcnt); 740 } else { 741 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 742 } 743 744 if (ret == 0) { 745 nc->receive_disabled = 1; 746 } 747 748 return ret; 749 } 750 751 ssize_t qemu_sendv_packet_async(NetClientState *sender, 752 const struct iovec *iov, int iovcnt, 753 NetPacketSent *sent_cb) 754 { 755 NetQueue *queue; 756 int ret; 757 758 if (sender->link_down || !sender->peer) { 759 return iov_size(iov, iovcnt); 760 } 761 762 /* Let filters handle the packet first */ 763 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 764 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 765 if (ret) { 766 return ret; 767 } 768 769 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 770 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 771 if (ret) { 772 return ret; 773 } 774 775 queue = sender->peer->incoming_queue; 776 777 return qemu_net_queue_send_iov(queue, sender, 778 QEMU_NET_PACKET_FLAG_NONE, 779 iov, iovcnt, sent_cb); 780 } 781 782 ssize_t 783 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 784 { 785 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 786 } 787 788 NetClientState *qemu_find_netdev(const char *id) 789 { 790 NetClientState *nc; 791 792 QTAILQ_FOREACH(nc, &net_clients, next) { 793 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) 794 continue; 795 if (!strcmp(nc->name, id)) { 796 return nc; 797 } 798 } 799 800 return NULL; 801 } 802 803 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 804 NetClientOptionsKind type, int max) 805 { 806 NetClientState *nc; 807 int ret = 0; 808 809 QTAILQ_FOREACH(nc, &net_clients, next) { 810 if (nc->info->type == type) { 811 continue; 812 } 813 if (!id || !strcmp(nc->name, id)) { 814 if (ret < max) { 815 ncs[ret] = nc; 816 } 817 ret++; 818 } 819 } 820 821 return ret; 822 } 823 824 static int nic_get_free_idx(void) 825 { 826 int index; 827 828 for (index = 0; index < MAX_NICS; index++) 829 if (!nd_table[index].used) 830 return index; 831 return -1; 832 } 833 834 int qemu_show_nic_models(const char *arg, const char *const *models) 835 { 836 int i; 837 838 if (!arg || !is_help_option(arg)) { 839 return 0; 840 } 841 842 fprintf(stderr, "qemu: Supported NIC models: "); 843 for (i = 0 ; models[i]; i++) 844 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 845 return 1; 846 } 847 848 void qemu_check_nic_model(NICInfo *nd, const char *model) 849 { 850 const char *models[2]; 851 852 models[0] = model; 853 models[1] = NULL; 854 855 if (qemu_show_nic_models(nd->model, models)) 856 exit(0); 857 if (qemu_find_nic_model(nd, models, model) < 0) 858 exit(1); 859 } 860 861 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 862 const char *default_model) 863 { 864 int i; 865 866 if (!nd->model) 867 nd->model = g_strdup(default_model); 868 869 for (i = 0 ; models[i]; i++) { 870 if (strcmp(nd->model, models[i]) == 0) 871 return i; 872 } 873 874 error_report("Unsupported NIC model: %s", nd->model); 875 return -1; 876 } 877 878 static int net_init_nic(const NetClientOptions *opts, const char *name, 879 NetClientState *peer, Error **errp) 880 { 881 int idx; 882 NICInfo *nd; 883 const NetLegacyNicOptions *nic; 884 885 assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC); 886 nic = opts->nic; 887 888 idx = nic_get_free_idx(); 889 if (idx == -1 || nb_nics >= MAX_NICS) { 890 error_setg(errp, "too many NICs"); 891 return -1; 892 } 893 894 nd = &nd_table[idx]; 895 896 memset(nd, 0, sizeof(*nd)); 897 898 if (nic->has_netdev) { 899 nd->netdev = qemu_find_netdev(nic->netdev); 900 if (!nd->netdev) { 901 error_setg(errp, "netdev '%s' not found", nic->netdev); 902 return -1; 903 } 904 } else { 905 assert(peer); 906 nd->netdev = peer; 907 } 908 nd->name = g_strdup(name); 909 if (nic->has_model) { 910 nd->model = g_strdup(nic->model); 911 } 912 if (nic->has_addr) { 913 nd->devaddr = g_strdup(nic->addr); 914 } 915 916 if (nic->has_macaddr && 917 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 918 error_setg(errp, "invalid syntax for ethernet address"); 919 return -1; 920 } 921 if (nic->has_macaddr && 922 is_multicast_ether_addr(nd->macaddr.a)) { 923 error_setg(errp, 924 "NIC cannot have multicast MAC address (odd 1st byte)"); 925 return -1; 926 } 927 qemu_macaddr_default_if_unset(&nd->macaddr); 928 929 if (nic->has_vectors) { 930 if (nic->vectors > 0x7ffffff) { 931 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 932 return -1; 933 } 934 nd->nvectors = nic->vectors; 935 } else { 936 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 937 } 938 939 nd->used = 1; 940 nb_nics++; 941 942 return idx; 943 } 944 945 946 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])( 947 const NetClientOptions *opts, 948 const char *name, 949 NetClientState *peer, Error **errp) = { 950 [NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic, 951 #ifdef CONFIG_SLIRP 952 [NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp, 953 #endif 954 [NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap, 955 [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket, 956 #ifdef CONFIG_VDE 957 [NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde, 958 #endif 959 #ifdef CONFIG_NETMAP 960 [NET_CLIENT_OPTIONS_KIND_NETMAP] = net_init_netmap, 961 #endif 962 [NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump, 963 #ifdef CONFIG_NET_BRIDGE 964 [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge, 965 #endif 966 [NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport, 967 #ifdef CONFIG_VHOST_NET_USED 968 [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user, 969 #endif 970 #ifdef CONFIG_L2TPV3 971 [NET_CLIENT_OPTIONS_KIND_L2TPV3] = net_init_l2tpv3, 972 #endif 973 }; 974 975 976 static int net_client_init1(const void *object, int is_netdev, Error **errp) 977 { 978 const NetClientOptions *opts; 979 const char *name; 980 NetClientState *peer = NULL; 981 982 if (is_netdev) { 983 const Netdev *netdev = object; 984 opts = netdev->opts; 985 name = netdev->id; 986 987 if (opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP || 988 opts->kind == NET_CLIENT_OPTIONS_KIND_NIC || 989 !net_client_init_fun[opts->kind]) { 990 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 991 "a netdev backend type"); 992 return -1; 993 } 994 } else { 995 const NetLegacy *net = object; 996 opts = net->opts; 997 /* missing optional values have been initialized to "all bits zero" */ 998 name = net->has_id ? net->id : net->name; 999 1000 if (opts->kind == NET_CLIENT_OPTIONS_KIND_NONE) { 1001 return 0; /* nothing to do */ 1002 } 1003 if (opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT) { 1004 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1005 "a net type"); 1006 return -1; 1007 } 1008 1009 if (!net_client_init_fun[opts->kind]) { 1010 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1011 "a net backend type (maybe it is not compiled " 1012 "into this binary)"); 1013 return -1; 1014 } 1015 1016 /* Do not add to a vlan if it's a nic with a netdev= parameter. */ 1017 if (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC || 1018 !opts->nic->has_netdev) { 1019 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL); 1020 } 1021 } 1022 1023 if (net_client_init_fun[opts->kind](opts, name, peer, errp) < 0) { 1024 /* FIXME drop when all init functions store an Error */ 1025 if (errp && !*errp) { 1026 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1027 NetClientOptionsKind_lookup[opts->kind]); 1028 } 1029 return -1; 1030 } 1031 return 0; 1032 } 1033 1034 1035 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp) 1036 { 1037 if (is_netdev) { 1038 visit_type_Netdev(v, (Netdev **)object, NULL, errp); 1039 } else { 1040 visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp); 1041 } 1042 } 1043 1044 1045 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp) 1046 { 1047 void *object = NULL; 1048 Error *err = NULL; 1049 int ret = -1; 1050 1051 { 1052 OptsVisitor *ov = opts_visitor_new(opts); 1053 1054 net_visit(opts_get_visitor(ov), is_netdev, &object, &err); 1055 opts_visitor_cleanup(ov); 1056 } 1057 1058 if (!err) { 1059 ret = net_client_init1(object, is_netdev, &err); 1060 } 1061 1062 if (object) { 1063 QapiDeallocVisitor *dv = qapi_dealloc_visitor_new(); 1064 1065 net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL); 1066 qapi_dealloc_visitor_cleanup(dv); 1067 } 1068 1069 error_propagate(errp, err); 1070 return ret; 1071 } 1072 1073 1074 static int net_host_check_device(const char *device) 1075 { 1076 int i; 1077 for (i = 0; host_net_devices[i]; i++) { 1078 if (!strncmp(host_net_devices[i], device, 1079 strlen(host_net_devices[i]))) { 1080 return 1; 1081 } 1082 } 1083 1084 return 0; 1085 } 1086 1087 void hmp_host_net_add(Monitor *mon, const QDict *qdict) 1088 { 1089 const char *device = qdict_get_str(qdict, "device"); 1090 const char *opts_str = qdict_get_try_str(qdict, "opts"); 1091 Error *local_err = NULL; 1092 QemuOpts *opts; 1093 1094 if (!net_host_check_device(device)) { 1095 monitor_printf(mon, "invalid host network device %s\n", device); 1096 return; 1097 } 1098 1099 opts = qemu_opts_parse_noisily(qemu_find_opts("net"), 1100 opts_str ? opts_str : "", false); 1101 if (!opts) { 1102 return; 1103 } 1104 1105 qemu_opt_set(opts, "type", device, &error_abort); 1106 1107 net_client_init(opts, 0, &local_err); 1108 if (local_err) { 1109 error_report_err(local_err); 1110 monitor_printf(mon, "adding host network device %s failed\n", device); 1111 } 1112 } 1113 1114 void hmp_host_net_remove(Monitor *mon, const QDict *qdict) 1115 { 1116 NetClientState *nc; 1117 int vlan_id = qdict_get_int(qdict, "vlan_id"); 1118 const char *device = qdict_get_str(qdict, "device"); 1119 1120 nc = net_hub_find_client_by_name(vlan_id, device); 1121 if (!nc) { 1122 error_report("Host network device '%s' on hub '%d' not found", 1123 device, vlan_id); 1124 return; 1125 } 1126 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1127 error_report("invalid host network device '%s'", device); 1128 return; 1129 } 1130 1131 qemu_del_net_client(nc->peer); 1132 qemu_del_net_client(nc); 1133 } 1134 1135 void netdev_add(QemuOpts *opts, Error **errp) 1136 { 1137 net_client_init(opts, 1, errp); 1138 } 1139 1140 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1141 { 1142 Error *local_err = NULL; 1143 QemuOptsList *opts_list; 1144 QemuOpts *opts; 1145 1146 opts_list = qemu_find_opts_err("netdev", &local_err); 1147 if (local_err) { 1148 goto out; 1149 } 1150 1151 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1152 if (local_err) { 1153 goto out; 1154 } 1155 1156 netdev_add(opts, &local_err); 1157 if (local_err) { 1158 qemu_opts_del(opts); 1159 goto out; 1160 } 1161 1162 out: 1163 error_propagate(errp, local_err); 1164 } 1165 1166 void qmp_netdev_del(const char *id, Error **errp) 1167 { 1168 NetClientState *nc; 1169 QemuOpts *opts; 1170 1171 nc = qemu_find_netdev(id); 1172 if (!nc) { 1173 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1174 "Device '%s' not found", id); 1175 return; 1176 } 1177 1178 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1179 if (!opts) { 1180 error_setg(errp, "Device '%s' is not a netdev", id); 1181 return; 1182 } 1183 1184 qemu_del_net_client(nc); 1185 qemu_opts_del(opts); 1186 } 1187 1188 void print_net_client(Monitor *mon, NetClientState *nc) 1189 { 1190 NetFilterState *nf; 1191 1192 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1193 nc->queue_index, 1194 NetClientOptionsKind_lookup[nc->info->type], 1195 nc->info_str); 1196 if (!QTAILQ_EMPTY(&nc->filters)) { 1197 monitor_printf(mon, "filters:\n"); 1198 } 1199 QTAILQ_FOREACH(nf, &nc->filters, next) { 1200 monitor_printf(mon, " - %s: type=%s%s\n", 1201 object_get_canonical_path_component(OBJECT(nf)), 1202 object_get_typename(OBJECT(nf)), 1203 nf->info_str); 1204 } 1205 } 1206 1207 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1208 Error **errp) 1209 { 1210 NetClientState *nc; 1211 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1212 1213 QTAILQ_FOREACH(nc, &net_clients, next) { 1214 RxFilterInfoList *entry; 1215 RxFilterInfo *info; 1216 1217 if (has_name && strcmp(nc->name, name) != 0) { 1218 continue; 1219 } 1220 1221 /* only query rx-filter information of NIC */ 1222 if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) { 1223 if (has_name) { 1224 error_setg(errp, "net client(%s) isn't a NIC", name); 1225 return NULL; 1226 } 1227 continue; 1228 } 1229 1230 if (nc->info->query_rx_filter) { 1231 info = nc->info->query_rx_filter(nc); 1232 entry = g_malloc0(sizeof(*entry)); 1233 entry->value = info; 1234 1235 if (!filter_list) { 1236 filter_list = entry; 1237 } else { 1238 last_entry->next = entry; 1239 } 1240 last_entry = entry; 1241 } else if (has_name) { 1242 error_setg(errp, "net client(%s) doesn't support" 1243 " rx-filter querying", name); 1244 return NULL; 1245 } 1246 1247 if (has_name) { 1248 break; 1249 } 1250 } 1251 1252 if (filter_list == NULL && has_name) { 1253 error_setg(errp, "invalid net client name: %s", name); 1254 } 1255 1256 return filter_list; 1257 } 1258 1259 void hmp_info_network(Monitor *mon, const QDict *qdict) 1260 { 1261 NetClientState *nc, *peer; 1262 NetClientOptionsKind type; 1263 1264 net_hub_info(mon); 1265 1266 QTAILQ_FOREACH(nc, &net_clients, next) { 1267 peer = nc->peer; 1268 type = nc->info->type; 1269 1270 /* Skip if already printed in hub info */ 1271 if (net_hub_id_for_client(nc, NULL) == 0) { 1272 continue; 1273 } 1274 1275 if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) { 1276 print_net_client(mon, nc); 1277 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1278 if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) { 1279 monitor_printf(mon, " \\ "); 1280 print_net_client(mon, peer); 1281 } 1282 } 1283 } 1284 1285 void qmp_set_link(const char *name, bool up, Error **errp) 1286 { 1287 NetClientState *ncs[MAX_QUEUE_NUM]; 1288 NetClientState *nc; 1289 int queues, i; 1290 1291 queues = qemu_find_net_clients_except(name, ncs, 1292 NET_CLIENT_OPTIONS_KIND_MAX, 1293 MAX_QUEUE_NUM); 1294 1295 if (queues == 0) { 1296 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1297 "Device '%s' not found", name); 1298 return; 1299 } 1300 nc = ncs[0]; 1301 1302 for (i = 0; i < queues; i++) { 1303 ncs[i]->link_down = !up; 1304 } 1305 1306 if (nc->info->link_status_changed) { 1307 nc->info->link_status_changed(nc); 1308 } 1309 1310 if (nc->peer) { 1311 /* Change peer link only if the peer is NIC and then notify peer. 1312 * If the peer is a HUBPORT or a backend, we do not change the 1313 * link status. 1314 * 1315 * This behavior is compatible with qemu vlans where there could be 1316 * multiple clients that can still communicate with each other in 1317 * disconnected mode. For now maintain this compatibility. 1318 */ 1319 if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1320 for (i = 0; i < queues; i++) { 1321 ncs[i]->peer->link_down = !up; 1322 } 1323 } 1324 if (nc->peer->info->link_status_changed) { 1325 nc->peer->info->link_status_changed(nc->peer); 1326 } 1327 } 1328 } 1329 1330 static void net_vm_change_state_handler(void *opaque, int running, 1331 RunState state) 1332 { 1333 NetClientState *nc; 1334 NetClientState *tmp; 1335 1336 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1337 if (running) { 1338 /* Flush queued packets and wake up backends. */ 1339 if (nc->peer && qemu_can_send_packet(nc)) { 1340 qemu_flush_queued_packets(nc->peer); 1341 } 1342 } else { 1343 /* Complete all queued packets, to guarantee we don't modify 1344 * state later when VM is not running. 1345 */ 1346 qemu_flush_or_purge_queued_packets(nc, true); 1347 } 1348 } 1349 } 1350 1351 void net_cleanup(void) 1352 { 1353 NetClientState *nc; 1354 1355 /* We may del multiple entries during qemu_del_net_client(), 1356 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1357 */ 1358 while (!QTAILQ_EMPTY(&net_clients)) { 1359 nc = QTAILQ_FIRST(&net_clients); 1360 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1361 qemu_del_nic(qemu_get_nic(nc)); 1362 } else { 1363 qemu_del_net_client(nc); 1364 } 1365 } 1366 1367 qemu_del_vm_change_state_handler(net_change_state_entry); 1368 } 1369 1370 void net_check_clients(void) 1371 { 1372 NetClientState *nc; 1373 int i; 1374 1375 /* Don't warn about the default network setup that you get if 1376 * no command line -net or -netdev options are specified. There 1377 * are two cases that we would otherwise complain about: 1378 * (1) board doesn't support a NIC but the implicit "-net nic" 1379 * requested one 1380 * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic" 1381 * sets up a nic that isn't connected to anything. 1382 */ 1383 if (default_net) { 1384 return; 1385 } 1386 1387 net_hub_check_clients(); 1388 1389 QTAILQ_FOREACH(nc, &net_clients, next) { 1390 if (!nc->peer) { 1391 fprintf(stderr, "Warning: %s %s has no peer\n", 1392 nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ? 1393 "nic" : "netdev", nc->name); 1394 } 1395 } 1396 1397 /* Check that all NICs requested via -net nic actually got created. 1398 * NICs created via -device don't need to be checked here because 1399 * they are always instantiated. 1400 */ 1401 for (i = 0; i < MAX_NICS; i++) { 1402 NICInfo *nd = &nd_table[i]; 1403 if (nd->used && !nd->instantiated) { 1404 fprintf(stderr, "Warning: requested NIC (%s, model %s) " 1405 "was not created (not supported by this machine?)\n", 1406 nd->name ? nd->name : "anonymous", 1407 nd->model ? nd->model : "unspecified"); 1408 } 1409 } 1410 } 1411 1412 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1413 { 1414 Error *local_err = NULL; 1415 1416 net_client_init(opts, 0, &local_err); 1417 if (local_err) { 1418 error_report_err(local_err); 1419 return -1; 1420 } 1421 1422 return 0; 1423 } 1424 1425 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1426 { 1427 Error *local_err = NULL; 1428 int ret; 1429 1430 ret = net_client_init(opts, 1, &local_err); 1431 if (local_err) { 1432 error_report_err(local_err); 1433 return -1; 1434 } 1435 1436 return ret; 1437 } 1438 1439 int net_init_clients(void) 1440 { 1441 QemuOptsList *net = qemu_find_opts("net"); 1442 1443 if (default_net) { 1444 /* if no clients, we use a default config */ 1445 qemu_opts_set(net, NULL, "type", "nic", &error_abort); 1446 #ifdef CONFIG_SLIRP 1447 qemu_opts_set(net, NULL, "type", "user", &error_abort); 1448 #endif 1449 } 1450 1451 net_change_state_entry = 1452 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1453 1454 QTAILQ_INIT(&net_clients); 1455 1456 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1457 net_init_netdev, NULL, NULL)) { 1458 return -1; 1459 } 1460 1461 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) { 1462 return -1; 1463 } 1464 1465 return 0; 1466 } 1467 1468 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1469 { 1470 #if defined(CONFIG_SLIRP) 1471 int ret; 1472 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) { 1473 return ret; 1474 } 1475 #endif 1476 1477 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1478 return -1; 1479 } 1480 1481 default_net = 0; 1482 return 0; 1483 } 1484 1485 /* From FreeBSD */ 1486 /* XXX: optimize */ 1487 unsigned compute_mcast_idx(const uint8_t *ep) 1488 { 1489 uint32_t crc; 1490 int carry, i, j; 1491 uint8_t b; 1492 1493 crc = 0xffffffff; 1494 for (i = 0; i < 6; i++) { 1495 b = *ep++; 1496 for (j = 0; j < 8; j++) { 1497 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1498 crc <<= 1; 1499 b >>= 1; 1500 if (carry) { 1501 crc = ((crc ^ POLYNOMIAL) | carry); 1502 } 1503 } 1504 } 1505 return crc >> 26; 1506 } 1507 1508 QemuOptsList qemu_netdev_opts = { 1509 .name = "netdev", 1510 .implied_opt_name = "type", 1511 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1512 .desc = { 1513 /* 1514 * no elements => accept any params 1515 * validation will happen later 1516 */ 1517 { /* end of list */ } 1518 }, 1519 }; 1520 1521 QemuOptsList qemu_net_opts = { 1522 .name = "net", 1523 .implied_opt_name = "type", 1524 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1525 .desc = { 1526 /* 1527 * no elements => accept any params 1528 * validation will happen later 1529 */ 1530 { /* end of list */ } 1531 }, 1532 }; 1533