net/net.c

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