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 if (!nc || !nc->info->set_vnet_le) { 528 return -ENOSYS; 529 } 530 531 return nc->info->set_vnet_le(nc, is_le); 532 } 533 534 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 535 { 536 if (!nc || !nc->info->set_vnet_be) { 537 return -ENOSYS; 538 } 539 540 return nc->info->set_vnet_be(nc, is_be); 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 if (sender->peer->receive_disabled) { 556 return 0; 557 } else if (sender->peer->info->can_receive && 558 !sender->peer->info->can_receive(sender->peer)) { 559 return 0; 560 } 561 return 1; 562 } 563 564 static ssize_t filter_receive_iov(NetClientState *nc, 565 NetFilterDirection direction, 566 NetClientState *sender, 567 unsigned flags, 568 const struct iovec *iov, 569 int iovcnt, 570 NetPacketSent *sent_cb) 571 { 572 ssize_t ret = 0; 573 NetFilterState *nf = NULL; 574 575 QTAILQ_FOREACH(nf, &nc->filters, next) { 576 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 577 iovcnt, sent_cb); 578 if (ret) { 579 return ret; 580 } 581 } 582 583 return ret; 584 } 585 586 static ssize_t filter_receive(NetClientState *nc, 587 NetFilterDirection direction, 588 NetClientState *sender, 589 unsigned flags, 590 const uint8_t *data, 591 size_t size, 592 NetPacketSent *sent_cb) 593 { 594 struct iovec iov = { 595 .iov_base = (void *)data, 596 .iov_len = size 597 }; 598 599 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 600 } 601 602 void qemu_purge_queued_packets(NetClientState *nc) 603 { 604 if (!nc->peer) { 605 return; 606 } 607 608 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 609 } 610 611 static 612 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 613 { 614 nc->receive_disabled = 0; 615 616 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) { 617 if (net_hub_flush(nc->peer)) { 618 qemu_notify_event(); 619 } 620 } 621 if (qemu_net_queue_flush(nc->incoming_queue)) { 622 /* We emptied the queue successfully, signal to the IO thread to repoll 623 * the file descriptor (for tap, for example). 624 */ 625 qemu_notify_event(); 626 } else if (purge) { 627 /* Unable to empty the queue, purge remaining packets */ 628 qemu_net_queue_purge(nc->incoming_queue, nc); 629 } 630 } 631 632 void qemu_flush_queued_packets(NetClientState *nc) 633 { 634 qemu_flush_or_purge_queued_packets(nc, false); 635 } 636 637 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 638 unsigned flags, 639 const uint8_t *buf, int size, 640 NetPacketSent *sent_cb) 641 { 642 NetQueue *queue; 643 int ret; 644 645 #ifdef DEBUG_NET 646 printf("qemu_send_packet_async:\n"); 647 hex_dump(stdout, buf, size); 648 #endif 649 650 if (sender->link_down || !sender->peer) { 651 return size; 652 } 653 654 /* Let filters handle the packet first */ 655 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 656 sender, flags, buf, size, sent_cb); 657 if (ret) { 658 return ret; 659 } 660 661 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 662 sender, flags, buf, size, sent_cb); 663 if (ret) { 664 return ret; 665 } 666 667 queue = sender->peer->incoming_queue; 668 669 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 670 } 671 672 ssize_t qemu_send_packet_async(NetClientState *sender, 673 const uint8_t *buf, int size, 674 NetPacketSent *sent_cb) 675 { 676 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 677 buf, size, sent_cb); 678 } 679 680 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 681 { 682 qemu_send_packet_async(nc, buf, size, NULL); 683 } 684 685 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 686 { 687 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 688 buf, size, NULL); 689 } 690 691 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 692 int iovcnt, unsigned flags) 693 { 694 uint8_t buf[NET_BUFSIZE]; 695 uint8_t *buffer; 696 size_t offset; 697 698 if (iovcnt == 1) { 699 buffer = iov[0].iov_base; 700 offset = iov[0].iov_len; 701 } else { 702 buffer = buf; 703 offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer)); 704 } 705 706 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 707 return nc->info->receive_raw(nc, buffer, offset); 708 } else { 709 return nc->info->receive(nc, buffer, offset); 710 } 711 } 712 713 ssize_t qemu_deliver_packet_iov(NetClientState *sender, 714 unsigned flags, 715 const struct iovec *iov, 716 int iovcnt, 717 void *opaque) 718 { 719 NetClientState *nc = opaque; 720 int ret; 721 722 if (nc->link_down) { 723 return iov_size(iov, iovcnt); 724 } 725 726 if (nc->receive_disabled) { 727 return 0; 728 } 729 730 if (nc->info->receive_iov) { 731 ret = nc->info->receive_iov(nc, iov, iovcnt); 732 } else { 733 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 734 } 735 736 if (ret == 0) { 737 nc->receive_disabled = 1; 738 } 739 740 return ret; 741 } 742 743 ssize_t qemu_sendv_packet_async(NetClientState *sender, 744 const struct iovec *iov, int iovcnt, 745 NetPacketSent *sent_cb) 746 { 747 NetQueue *queue; 748 int ret; 749 750 if (sender->link_down || !sender->peer) { 751 return iov_size(iov, iovcnt); 752 } 753 754 /* Let filters handle the packet first */ 755 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 756 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 757 if (ret) { 758 return ret; 759 } 760 761 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 762 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 763 if (ret) { 764 return ret; 765 } 766 767 queue = sender->peer->incoming_queue; 768 769 return qemu_net_queue_send_iov(queue, sender, 770 QEMU_NET_PACKET_FLAG_NONE, 771 iov, iovcnt, sent_cb); 772 } 773 774 ssize_t 775 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 776 { 777 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 778 } 779 780 NetClientState *qemu_find_netdev(const char *id) 781 { 782 NetClientState *nc; 783 784 QTAILQ_FOREACH(nc, &net_clients, next) { 785 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) 786 continue; 787 if (!strcmp(nc->name, id)) { 788 return nc; 789 } 790 } 791 792 return NULL; 793 } 794 795 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 796 NetClientOptionsKind type, int max) 797 { 798 NetClientState *nc; 799 int ret = 0; 800 801 QTAILQ_FOREACH(nc, &net_clients, next) { 802 if (nc->info->type == type) { 803 continue; 804 } 805 if (!id || !strcmp(nc->name, id)) { 806 if (ret < max) { 807 ncs[ret] = nc; 808 } 809 ret++; 810 } 811 } 812 813 return ret; 814 } 815 816 static int nic_get_free_idx(void) 817 { 818 int index; 819 820 for (index = 0; index < MAX_NICS; index++) 821 if (!nd_table[index].used) 822 return index; 823 return -1; 824 } 825 826 int qemu_show_nic_models(const char *arg, const char *const *models) 827 { 828 int i; 829 830 if (!arg || !is_help_option(arg)) { 831 return 0; 832 } 833 834 fprintf(stderr, "qemu: Supported NIC models: "); 835 for (i = 0 ; models[i]; i++) 836 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); 837 return 1; 838 } 839 840 void qemu_check_nic_model(NICInfo *nd, const char *model) 841 { 842 const char *models[2]; 843 844 models[0] = model; 845 models[1] = NULL; 846 847 if (qemu_show_nic_models(nd->model, models)) 848 exit(0); 849 if (qemu_find_nic_model(nd, models, model) < 0) 850 exit(1); 851 } 852 853 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 854 const char *default_model) 855 { 856 int i; 857 858 if (!nd->model) 859 nd->model = g_strdup(default_model); 860 861 for (i = 0 ; models[i]; i++) { 862 if (strcmp(nd->model, models[i]) == 0) 863 return i; 864 } 865 866 error_report("Unsupported NIC model: %s", nd->model); 867 return -1; 868 } 869 870 static int net_init_nic(const NetClientOptions *opts, const char *name, 871 NetClientState *peer, Error **errp) 872 { 873 int idx; 874 NICInfo *nd; 875 const NetLegacyNicOptions *nic; 876 877 assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC); 878 nic = opts->nic; 879 880 idx = nic_get_free_idx(); 881 if (idx == -1 || nb_nics >= MAX_NICS) { 882 error_setg(errp, "too many NICs"); 883 return -1; 884 } 885 886 nd = &nd_table[idx]; 887 888 memset(nd, 0, sizeof(*nd)); 889 890 if (nic->has_netdev) { 891 nd->netdev = qemu_find_netdev(nic->netdev); 892 if (!nd->netdev) { 893 error_setg(errp, "netdev '%s' not found", nic->netdev); 894 return -1; 895 } 896 } else { 897 assert(peer); 898 nd->netdev = peer; 899 } 900 nd->name = g_strdup(name); 901 if (nic->has_model) { 902 nd->model = g_strdup(nic->model); 903 } 904 if (nic->has_addr) { 905 nd->devaddr = g_strdup(nic->addr); 906 } 907 908 if (nic->has_macaddr && 909 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 910 error_setg(errp, "invalid syntax for ethernet address"); 911 return -1; 912 } 913 if (nic->has_macaddr && 914 is_multicast_ether_addr(nd->macaddr.a)) { 915 error_setg(errp, 916 "NIC cannot have multicast MAC address (odd 1st byte)"); 917 return -1; 918 } 919 qemu_macaddr_default_if_unset(&nd->macaddr); 920 921 if (nic->has_vectors) { 922 if (nic->vectors > 0x7ffffff) { 923 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 924 return -1; 925 } 926 nd->nvectors = nic->vectors; 927 } else { 928 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 929 } 930 931 nd->used = 1; 932 nb_nics++; 933 934 return idx; 935 } 936 937 938 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])( 939 const NetClientOptions *opts, 940 const char *name, 941 NetClientState *peer, Error **errp) = { 942 [NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic, 943 #ifdef CONFIG_SLIRP 944 [NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp, 945 #endif 946 [NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap, 947 [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket, 948 #ifdef CONFIG_VDE 949 [NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde, 950 #endif 951 #ifdef CONFIG_NETMAP 952 [NET_CLIENT_OPTIONS_KIND_NETMAP] = net_init_netmap, 953 #endif 954 [NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump, 955 #ifdef CONFIG_NET_BRIDGE 956 [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge, 957 #endif 958 [NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport, 959 #ifdef CONFIG_VHOST_NET_USED 960 [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user, 961 #endif 962 #ifdef CONFIG_L2TPV3 963 [NET_CLIENT_OPTIONS_KIND_L2TPV3] = net_init_l2tpv3, 964 #endif 965 }; 966 967 968 static int net_client_init1(const void *object, int is_netdev, Error **errp) 969 { 970 const NetClientOptions *opts; 971 const char *name; 972 NetClientState *peer = NULL; 973 974 if (is_netdev) { 975 const Netdev *netdev = object; 976 opts = netdev->opts; 977 name = netdev->id; 978 979 if (opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP || 980 opts->kind == NET_CLIENT_OPTIONS_KIND_NIC || 981 !net_client_init_fun[opts->kind]) { 982 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 983 "a netdev backend type"); 984 return -1; 985 } 986 } else { 987 const NetLegacy *net = object; 988 opts = net->opts; 989 /* missing optional values have been initialized to "all bits zero" */ 990 name = net->has_id ? net->id : net->name; 991 992 if (opts->kind == NET_CLIENT_OPTIONS_KIND_NONE) { 993 return 0; /* nothing to do */ 994 } 995 if (opts->kind == NET_CLIENT_OPTIONS_KIND_HUBPORT) { 996 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 997 "a net type"); 998 return -1; 999 } 1000 1001 if (!net_client_init_fun[opts->kind]) { 1002 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1003 "a net backend type (maybe it is not compiled " 1004 "into this binary)"); 1005 return -1; 1006 } 1007 1008 /* Do not add to a vlan if it's a nic with a netdev= parameter. */ 1009 if (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC || 1010 !opts->nic->has_netdev) { 1011 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL); 1012 } 1013 } 1014 1015 if (net_client_init_fun[opts->kind](opts, name, peer, errp) < 0) { 1016 /* FIXME drop when all init functions store an Error */ 1017 if (errp && !*errp) { 1018 error_setg(errp, QERR_DEVICE_INIT_FAILED, 1019 NetClientOptionsKind_lookup[opts->kind]); 1020 } 1021 return -1; 1022 } 1023 return 0; 1024 } 1025 1026 1027 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp) 1028 { 1029 if (is_netdev) { 1030 visit_type_Netdev(v, (Netdev **)object, NULL, errp); 1031 } else { 1032 visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp); 1033 } 1034 } 1035 1036 1037 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp) 1038 { 1039 void *object = NULL; 1040 Error *err = NULL; 1041 int ret = -1; 1042 1043 { 1044 OptsVisitor *ov = opts_visitor_new(opts); 1045 1046 net_visit(opts_get_visitor(ov), is_netdev, &object, &err); 1047 opts_visitor_cleanup(ov); 1048 } 1049 1050 if (!err) { 1051 ret = net_client_init1(object, is_netdev, &err); 1052 } 1053 1054 if (object) { 1055 QapiDeallocVisitor *dv = qapi_dealloc_visitor_new(); 1056 1057 net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL); 1058 qapi_dealloc_visitor_cleanup(dv); 1059 } 1060 1061 error_propagate(errp, err); 1062 return ret; 1063 } 1064 1065 1066 static int net_host_check_device(const char *device) 1067 { 1068 int i; 1069 for (i = 0; host_net_devices[i]; i++) { 1070 if (!strncmp(host_net_devices[i], device, 1071 strlen(host_net_devices[i]))) { 1072 return 1; 1073 } 1074 } 1075 1076 return 0; 1077 } 1078 1079 void hmp_host_net_add(Monitor *mon, const QDict *qdict) 1080 { 1081 const char *device = qdict_get_str(qdict, "device"); 1082 const char *opts_str = qdict_get_try_str(qdict, "opts"); 1083 Error *local_err = NULL; 1084 QemuOpts *opts; 1085 1086 if (!net_host_check_device(device)) { 1087 monitor_printf(mon, "invalid host network device %s\n", device); 1088 return; 1089 } 1090 1091 opts = qemu_opts_parse_noisily(qemu_find_opts("net"), 1092 opts_str ? opts_str : "", false); 1093 if (!opts) { 1094 return; 1095 } 1096 1097 qemu_opt_set(opts, "type", device, &error_abort); 1098 1099 net_client_init(opts, 0, &local_err); 1100 if (local_err) { 1101 error_report_err(local_err); 1102 monitor_printf(mon, "adding host network device %s failed\n", device); 1103 } 1104 } 1105 1106 void hmp_host_net_remove(Monitor *mon, const QDict *qdict) 1107 { 1108 NetClientState *nc; 1109 int vlan_id = qdict_get_int(qdict, "vlan_id"); 1110 const char *device = qdict_get_str(qdict, "device"); 1111 1112 nc = net_hub_find_client_by_name(vlan_id, device); 1113 if (!nc) { 1114 error_report("Host network device '%s' on hub '%d' not found", 1115 device, vlan_id); 1116 return; 1117 } 1118 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1119 error_report("invalid host network device '%s'", device); 1120 return; 1121 } 1122 1123 qemu_del_net_client(nc->peer); 1124 qemu_del_net_client(nc); 1125 } 1126 1127 void netdev_add(QemuOpts *opts, Error **errp) 1128 { 1129 net_client_init(opts, 1, errp); 1130 } 1131 1132 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp) 1133 { 1134 Error *local_err = NULL; 1135 QemuOptsList *opts_list; 1136 QemuOpts *opts; 1137 1138 opts_list = qemu_find_opts_err("netdev", &local_err); 1139 if (local_err) { 1140 goto out; 1141 } 1142 1143 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); 1144 if (local_err) { 1145 goto out; 1146 } 1147 1148 netdev_add(opts, &local_err); 1149 if (local_err) { 1150 qemu_opts_del(opts); 1151 goto out; 1152 } 1153 1154 out: 1155 error_propagate(errp, local_err); 1156 } 1157 1158 void qmp_netdev_del(const char *id, Error **errp) 1159 { 1160 NetClientState *nc; 1161 QemuOpts *opts; 1162 1163 nc = qemu_find_netdev(id); 1164 if (!nc) { 1165 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1166 "Device '%s' not found", id); 1167 return; 1168 } 1169 1170 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); 1171 if (!opts) { 1172 error_setg(errp, "Device '%s' is not a netdev", id); 1173 return; 1174 } 1175 1176 qemu_del_net_client(nc); 1177 qemu_opts_del(opts); 1178 } 1179 1180 void print_net_client(Monitor *mon, NetClientState *nc) 1181 { 1182 NetFilterState *nf; 1183 1184 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1185 nc->queue_index, 1186 NetClientOptionsKind_lookup[nc->info->type], 1187 nc->info_str); 1188 if (!QTAILQ_EMPTY(&nc->filters)) { 1189 monitor_printf(mon, "filters:\n"); 1190 } 1191 QTAILQ_FOREACH(nf, &nc->filters, next) { 1192 monitor_printf(mon, " - %s: type=%s%s\n", 1193 object_get_canonical_path_component(OBJECT(nf)), 1194 object_get_typename(OBJECT(nf)), 1195 nf->info_str); 1196 } 1197 } 1198 1199 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1200 Error **errp) 1201 { 1202 NetClientState *nc; 1203 RxFilterInfoList *filter_list = NULL, *last_entry = NULL; 1204 1205 QTAILQ_FOREACH(nc, &net_clients, next) { 1206 RxFilterInfoList *entry; 1207 RxFilterInfo *info; 1208 1209 if (has_name && strcmp(nc->name, name) != 0) { 1210 continue; 1211 } 1212 1213 /* only query rx-filter information of NIC */ 1214 if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) { 1215 if (has_name) { 1216 error_setg(errp, "net client(%s) isn't a NIC", name); 1217 return NULL; 1218 } 1219 continue; 1220 } 1221 1222 if (nc->info->query_rx_filter) { 1223 info = nc->info->query_rx_filter(nc); 1224 entry = g_malloc0(sizeof(*entry)); 1225 entry->value = info; 1226 1227 if (!filter_list) { 1228 filter_list = entry; 1229 } else { 1230 last_entry->next = entry; 1231 } 1232 last_entry = entry; 1233 } else if (has_name) { 1234 error_setg(errp, "net client(%s) doesn't support" 1235 " rx-filter querying", name); 1236 return NULL; 1237 } 1238 1239 if (has_name) { 1240 break; 1241 } 1242 } 1243 1244 if (filter_list == NULL && has_name) { 1245 error_setg(errp, "invalid net client name: %s", name); 1246 } 1247 1248 return filter_list; 1249 } 1250 1251 void hmp_info_network(Monitor *mon, const QDict *qdict) 1252 { 1253 NetClientState *nc, *peer; 1254 NetClientOptionsKind type; 1255 1256 net_hub_info(mon); 1257 1258 QTAILQ_FOREACH(nc, &net_clients, next) { 1259 peer = nc->peer; 1260 type = nc->info->type; 1261 1262 /* Skip if already printed in hub info */ 1263 if (net_hub_id_for_client(nc, NULL) == 0) { 1264 continue; 1265 } 1266 1267 if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) { 1268 print_net_client(mon, nc); 1269 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1270 if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) { 1271 monitor_printf(mon, " \\ "); 1272 print_net_client(mon, peer); 1273 } 1274 } 1275 } 1276 1277 void qmp_set_link(const char *name, bool up, Error **errp) 1278 { 1279 NetClientState *ncs[MAX_QUEUE_NUM]; 1280 NetClientState *nc; 1281 int queues, i; 1282 1283 queues = qemu_find_net_clients_except(name, ncs, 1284 NET_CLIENT_OPTIONS_KIND_MAX, 1285 MAX_QUEUE_NUM); 1286 1287 if (queues == 0) { 1288 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1289 "Device '%s' not found", name); 1290 return; 1291 } 1292 nc = ncs[0]; 1293 1294 for (i = 0; i < queues; i++) { 1295 ncs[i]->link_down = !up; 1296 } 1297 1298 if (nc->info->link_status_changed) { 1299 nc->info->link_status_changed(nc); 1300 } 1301 1302 if (nc->peer) { 1303 /* Change peer link only if the peer is NIC and then notify peer. 1304 * If the peer is a HUBPORT or a backend, we do not change the 1305 * link status. 1306 * 1307 * This behavior is compatible with qemu vlans where there could be 1308 * multiple clients that can still communicate with each other in 1309 * disconnected mode. For now maintain this compatibility. 1310 */ 1311 if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1312 for (i = 0; i < queues; i++) { 1313 ncs[i]->peer->link_down = !up; 1314 } 1315 } 1316 if (nc->peer->info->link_status_changed) { 1317 nc->peer->info->link_status_changed(nc->peer); 1318 } 1319 } 1320 } 1321 1322 static void net_vm_change_state_handler(void *opaque, int running, 1323 RunState state) 1324 { 1325 NetClientState *nc; 1326 NetClientState *tmp; 1327 1328 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1329 if (running) { 1330 /* Flush queued packets and wake up backends. */ 1331 if (nc->peer && qemu_can_send_packet(nc)) { 1332 qemu_flush_queued_packets(nc->peer); 1333 } 1334 } else { 1335 /* Complete all queued packets, to guarantee we don't modify 1336 * state later when VM is not running. 1337 */ 1338 qemu_flush_or_purge_queued_packets(nc, true); 1339 } 1340 } 1341 } 1342 1343 void net_cleanup(void) 1344 { 1345 NetClientState *nc; 1346 1347 /* We may del multiple entries during qemu_del_net_client(), 1348 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1349 */ 1350 while (!QTAILQ_EMPTY(&net_clients)) { 1351 nc = QTAILQ_FIRST(&net_clients); 1352 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { 1353 qemu_del_nic(qemu_get_nic(nc)); 1354 } else { 1355 qemu_del_net_client(nc); 1356 } 1357 } 1358 1359 qemu_del_vm_change_state_handler(net_change_state_entry); 1360 } 1361 1362 void net_check_clients(void) 1363 { 1364 NetClientState *nc; 1365 int i; 1366 1367 /* Don't warn about the default network setup that you get if 1368 * no command line -net or -netdev options are specified. There 1369 * are two cases that we would otherwise complain about: 1370 * (1) board doesn't support a NIC but the implicit "-net nic" 1371 * requested one 1372 * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic" 1373 * sets up a nic that isn't connected to anything. 1374 */ 1375 if (default_net) { 1376 return; 1377 } 1378 1379 net_hub_check_clients(); 1380 1381 QTAILQ_FOREACH(nc, &net_clients, next) { 1382 if (!nc->peer) { 1383 fprintf(stderr, "Warning: %s %s has no peer\n", 1384 nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ? 1385 "nic" : "netdev", nc->name); 1386 } 1387 } 1388 1389 /* Check that all NICs requested via -net nic actually got created. 1390 * NICs created via -device don't need to be checked here because 1391 * they are always instantiated. 1392 */ 1393 for (i = 0; i < MAX_NICS; i++) { 1394 NICInfo *nd = &nd_table[i]; 1395 if (nd->used && !nd->instantiated) { 1396 fprintf(stderr, "Warning: requested NIC (%s, model %s) " 1397 "was not created (not supported by this machine?)\n", 1398 nd->name ? nd->name : "anonymous", 1399 nd->model ? nd->model : "unspecified"); 1400 } 1401 } 1402 } 1403 1404 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1405 { 1406 Error *local_err = NULL; 1407 1408 net_client_init(opts, 0, &local_err); 1409 if (local_err) { 1410 error_report_err(local_err); 1411 return -1; 1412 } 1413 1414 return 0; 1415 } 1416 1417 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1418 { 1419 Error *local_err = NULL; 1420 int ret; 1421 1422 ret = net_client_init(opts, 1, &local_err); 1423 if (local_err) { 1424 error_report_err(local_err); 1425 return -1; 1426 } 1427 1428 return ret; 1429 } 1430 1431 int net_init_clients(void) 1432 { 1433 QemuOptsList *net = qemu_find_opts("net"); 1434 1435 if (default_net) { 1436 /* if no clients, we use a default config */ 1437 qemu_opts_set(net, NULL, "type", "nic", &error_abort); 1438 #ifdef CONFIG_SLIRP 1439 qemu_opts_set(net, NULL, "type", "user", &error_abort); 1440 #endif 1441 } 1442 1443 net_change_state_entry = 1444 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1445 1446 QTAILQ_INIT(&net_clients); 1447 1448 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1449 net_init_netdev, NULL, NULL)) { 1450 return -1; 1451 } 1452 1453 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) { 1454 return -1; 1455 } 1456 1457 return 0; 1458 } 1459 1460 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1461 { 1462 #if defined(CONFIG_SLIRP) 1463 int ret; 1464 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) { 1465 return ret; 1466 } 1467 #endif 1468 1469 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1470 return -1; 1471 } 1472 1473 default_net = 0; 1474 return 0; 1475 } 1476 1477 /* From FreeBSD */ 1478 /* XXX: optimize */ 1479 unsigned compute_mcast_idx(const uint8_t *ep) 1480 { 1481 uint32_t crc; 1482 int carry, i, j; 1483 uint8_t b; 1484 1485 crc = 0xffffffff; 1486 for (i = 0; i < 6; i++) { 1487 b = *ep++; 1488 for (j = 0; j < 8; j++) { 1489 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1490 crc <<= 1; 1491 b >>= 1; 1492 if (carry) { 1493 crc = ((crc ^ POLYNOMIAL) | carry); 1494 } 1495 } 1496 } 1497 return crc >> 26; 1498 } 1499 1500 QemuOptsList qemu_netdev_opts = { 1501 .name = "netdev", 1502 .implied_opt_name = "type", 1503 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1504 .desc = { 1505 /* 1506 * no elements => accept any params 1507 * validation will happen later 1508 */ 1509 { /* end of list */ } 1510 }, 1511 }; 1512 1513 QemuOptsList qemu_net_opts = { 1514 .name = "net", 1515 .implied_opt_name = "type", 1516 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1517 .desc = { 1518 /* 1519 * no elements => accept any params 1520 * validation will happen later 1521 */ 1522 { /* end of list */ } 1523 }, 1524 }; 1525