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 "net.h"
  25
  26 #include "config-host.h"
  27
  28 #include "net/tap.h"
  29 #include "net/socket.h"
  30 #include "net/dump.h"
  31 #include "net/slirp.h"
  32 #include "net/vde.h"
  33 #include "net/util.h"
  34 #include "monitor.h"
  35 #include "sysemu.h"
  36 #include "qemu-common.h"
  37 #include "qemu_socket.h"
  38 #include "hw/qdev.h"
  39
  40 static QTAILQ_HEAD(, VLANState) vlans;
  41 static QTAILQ_HEAD(, VLANClientState) non_vlan_clients;
  42
  43 int default_net = 1;
  44
  45 /***********************************************************/
  46 /* network device redirectors */
  47
  48 #if defined(DEBUG_NET)
  49 static void hex_dump(FILE *f, const uint8_t *buf, int size)
  50 {
  51     int len, i, j, c;
  52
  53     for(i=0;i<size;i+=16) {
  54         len = size - i;
  55         if (len > 16)
  56             len = 16;
  57         fprintf(f, "%08x ", i);
  58         for(j=0;j<16;j++) {
  59             if (j < len)
  60                 fprintf(f, " %02x", buf[i+j]);
  61             else
  62                 fprintf(f, "   ");
  63         }
  64         fprintf(f, " ");
  65         for(j=0;j<len;j++) {
  66             c = buf[i+j];
  67             if (c < ' ' || c > '~')
  68                 c = '.';
  69             fprintf(f, "%c", c);
  70         }
  71         fprintf(f, "\n");
  72     }
  73 }
  74 #endif
  75
  76 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  77 {
  78     const char *p, *p1;
  79     int len;
  80     p = *pp;
  81     p1 = strchr(p, sep);
  82     if (!p1)
  83         return -1;
  84     len = p1 - p;
  85     p1++;
  86     if (buf_size > 0) {
  87         if (len > buf_size - 1)
  88             len = buf_size - 1;
  89         memcpy(buf, p, len);
  90         buf[len] = '\0';
  91     }
  92     *pp = p1;
  93     return 0;
  94 }
  95
  96 int parse_host_src_port(struct sockaddr_in *haddr,
  97                         struct sockaddr_in *saddr,
  98                         const char *input_str)
  99 {
 100     char *str = qemu_strdup(input_str);
 101     char *host_str = str;
 102     char *src_str;
 103     const char *src_str2;
 104     char *ptr;
 105
 106     /*
 107      * Chop off any extra arguments at the end of the string which
 108      * would start with a comma, then fill in the src port information
 109      * if it was provided else use the "any address" and "any port".
 110      */
 111     if ((ptr = strchr(str,',')))
 112         *ptr = '\0';
 113
 114     if ((src_str = strchr(input_str,'@'))) {
 115         *src_str = '\0';
 116         src_str++;
 117     }
 118
 119     if (parse_host_port(haddr, host_str) < 0)
 120         goto fail;
 121
 122     src_str2 = src_str;
 123     if (!src_str || *src_str == '\0')
 124         src_str2 = ":0";
 125
 126     if (parse_host_port(saddr, src_str2) < 0)
 127         goto fail;
 128
 129     free(str);
 130     return(0);
 131
 132 fail:
 133     free(str);
 134     return -1;
 135 }
 136
 137 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 138 {
 139     char buf[512];
 140     struct hostent *he;
 141     const char *p, *r;
 142     int port;
 143
 144     p = str;
 145     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 146         return -1;
 147     saddr->sin_family = AF_INET;
 148     if (buf[0] == '\0') {
 149         saddr->sin_addr.s_addr = 0;
 150     } else {
 151         if (qemu_isdigit(buf[0])) {
 152             if (!inet_aton(buf, &saddr->sin_addr))
 153                 return -1;
 154         } else {
 155             if ((he = gethostbyname(buf)) == NULL)
 156                 return - 1;
 157             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 158         }
 159     }
 160     port = strtol(p, (char **)&r, 0);
 161     if (r == p)
 162         return -1;
 163     saddr->sin_port = htons(port);
 164     return 0;
 165 }
 166
 167 void qemu_format_nic_info_str(VLANClientState *vc, uint8_t macaddr[6])
 168 {
 169     snprintf(vc->info_str, sizeof(vc->info_str),
 170              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 171              vc->model,
 172              macaddr[0], macaddr[1], macaddr[2],
 173              macaddr[3], macaddr[4], macaddr[5]);
 174 }
 175
 176 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
 177 {
 178     static int index = 0;
 179     static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
 180
 181     if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
 182         return;
 183     macaddr->a[0] = 0x52;
 184     macaddr->a[1] = 0x54;
 185     macaddr->a[2] = 0x00;
 186     macaddr->a[3] = 0x12;
 187     macaddr->a[4] = 0x34;
 188     macaddr->a[5] = 0x56 + index++;
 189 }
 190
 191 static char *assign_name(VLANClientState *vc1, const char *model)
 192 {
 193     VLANState *vlan;
 194     char buf[256];
 195     int id = 0;
 196
 197     QTAILQ_FOREACH(vlan, &vlans, next) {
 198         VLANClientState *vc;
 199
 200         QTAILQ_FOREACH(vc, &vlan->clients, next) {
 201             if (vc != vc1 && strcmp(vc->model, model) == 0) {
 202                 id++;
 203             }
 204         }
 205     }
 206
 207     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 208
 209     return qemu_strdup(buf);
 210 }
 211
 212 static ssize_t qemu_deliver_packet(VLANClientState *sender,
 213                                    unsigned flags,
 214                                    const uint8_t *data,
 215                                    size_t size,
 216                                    void *opaque);
 217 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 218                                        unsigned flags,
 219                                        const struct iovec *iov,
 220                                        int iovcnt,
 221                                        void *opaque);
 222
 223 VLANClientState *qemu_new_net_client(NetClientInfo *info,
 224                                      VLANState *vlan,
 225                                      VLANClientState *peer,
 226                                      const char *model,
 227                                      const char *name)
 228 {
 229     VLANClientState *vc;
 230
 231     assert(info->size >= sizeof(VLANClientState));
 232
 233     vc = qemu_mallocz(info->size);
 234
 235     vc->info = info;
 236     vc->model = qemu_strdup(model);
 237     if (name) {
 238         vc->name = qemu_strdup(name);
 239     } else {
 240         vc->name = assign_name(vc, model);
 241     }
 242
 243     if (vlan) {
 244         assert(!peer);
 245         vc->vlan = vlan;
 246         QTAILQ_INSERT_TAIL(&vc->vlan->clients, vc, next);
 247     } else {
 248         if (peer) {
 249             assert(!peer->peer);
 250             vc->peer = peer;
 251             peer->peer = vc;
 252         }
 253         QTAILQ_INSERT_TAIL(&non_vlan_clients, vc, next);
 254
 255         vc->send_queue = qemu_new_net_queue(qemu_deliver_packet,
 256                                             qemu_deliver_packet_iov,
 257                                             vc);
 258     }
 259
 260     return vc;
 261 }
 262
 263 NICState *qemu_new_nic(NetClientInfo *info,
 264                        NICConf *conf,
 265                        const char *model,
 266                        const char *name,
 267                        void *opaque)
 268 {
 269     VLANClientState *nc;
 270     NICState *nic;
 271
 272     assert(info->type == NET_CLIENT_TYPE_NIC);
 273     assert(info->size >= sizeof(NICState));
 274
 275     nc = qemu_new_net_client(info, conf->vlan, conf->peer, model, name);
 276
 277     nic = DO_UPCAST(NICState, nc, nc);
 278     nic->conf = conf;
 279     nic->opaque = opaque;
 280
 281     return nic;
 282 }
 283
 284 static void qemu_cleanup_vlan_client(VLANClientState *vc)
 285 {
 286     if (vc->vlan) {
 287         QTAILQ_REMOVE(&vc->vlan->clients, vc, next);
 288     } else {
 289         QTAILQ_REMOVE(&non_vlan_clients, vc, next);
 290     }
 291
 292     if (vc->info->cleanup) {
 293         vc->info->cleanup(vc);
 294     }
 295 }
 296
 297 static void qemu_free_vlan_client(VLANClientState *vc)
 298 {
 299     if (!vc->vlan) {
 300         if (vc->send_queue) {
 301             qemu_del_net_queue(vc->send_queue);
 302         }
 303         if (vc->peer) {
 304             vc->peer->peer = NULL;
 305         }
 306     }
 307     qemu_free(vc->name);
 308     qemu_free(vc->model);
 309     qemu_free(vc);
 310 }
 311
 312 void qemu_del_vlan_client(VLANClientState *vc)
 313 {
 314     /* If there is a peer NIC, delete and cleanup client, but do not free. */
 315     if (!vc->vlan && vc->peer && vc->peer->info->type == NET_CLIENT_TYPE_NIC) {
 316         NICState *nic = DO_UPCAST(NICState, nc, vc->peer);
 317         if (nic->peer_deleted) {
 318             return;
 319         }
 320         nic->peer_deleted = true;
 321         /* Let NIC know peer is gone. */
 322         vc->peer->link_down = true;
 323         if (vc->peer->info->link_status_changed) {
 324             vc->peer->info->link_status_changed(vc->peer);
 325         }
 326         qemu_cleanup_vlan_client(vc);
 327         return;
 328     }
 329
 330     /* If this is a peer NIC and peer has already been deleted, free it now. */
 331     if (!vc->vlan && vc->peer && vc->info->type == NET_CLIENT_TYPE_NIC) {
 332         NICState *nic = DO_UPCAST(NICState, nc, vc);
 333         if (nic->peer_deleted) {
 334             qemu_free_vlan_client(vc->peer);
 335         }
 336     }
 337
 338     qemu_cleanup_vlan_client(vc);
 339     qemu_free_vlan_client(vc);
 340 }
 341
 342 VLANClientState *
 343 qemu_find_vlan_client_by_name(Monitor *mon, int vlan_id,
 344                               const char *client_str)
 345 {
 346     VLANState *vlan;
 347     VLANClientState *vc;
 348
 349     vlan = qemu_find_vlan(vlan_id, 0);
 350     if (!vlan) {
 351         monitor_printf(mon, "unknown VLAN %d\n", vlan_id);
 352         return NULL;
 353     }
 354
 355     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 356         if (!strcmp(vc->name, client_str)) {
 357             break;
 358         }
 359     }
 360     if (!vc) {
 361         monitor_printf(mon, "can't find device %s on VLAN %d\n",
 362                        client_str, vlan_id);
 363     }
 364
 365     return vc;
 366 }
 367
 368 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
 369 {
 370     VLANClientState *nc;
 371     VLANState *vlan;
 372
 373     QTAILQ_FOREACH(nc, &non_vlan_clients, next) {
 374         if (nc->info->type == NET_CLIENT_TYPE_NIC) {
 375             func(DO_UPCAST(NICState, nc, nc), opaque);
 376         }
 377     }
 378
 379     QTAILQ_FOREACH(vlan, &vlans, next) {
 380         QTAILQ_FOREACH(nc, &vlan->clients, next) {
 381             if (nc->info->type == NET_CLIENT_TYPE_NIC) {
 382                 func(DO_UPCAST(NICState, nc, nc), opaque);
 383             }
 384         }
 385     }
 386 }
 387
 388 int qemu_can_send_packet(VLANClientState *sender)
 389 {
 390     VLANState *vlan = sender->vlan;
 391     VLANClientState *vc;
 392
 393     if (sender->peer) {
 394         if (sender->peer->receive_disabled) {
 395             return 0;
 396         } else if (sender->peer->info->can_receive &&
 397                    !sender->peer->info->can_receive(sender->peer)) {
 398             return 0;
 399         } else {
 400             return 1;
 401         }
 402     }
 403
 404     if (!sender->vlan) {
 405         return 1;
 406     }
 407
 408     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 409         if (vc == sender) {
 410             continue;
 411         }
 412
 413         /* no can_receive() handler, they can always receive */
 414         if (!vc->info->can_receive || vc->info->can_receive(vc)) {
 415             return 1;
 416         }
 417     }
 418     return 0;
 419 }
 420
 421 static ssize_t qemu_deliver_packet(VLANClientState *sender,
 422                                    unsigned flags,
 423                                    const uint8_t *data,
 424                                    size_t size,
 425                                    void *opaque)
 426 {
 427     VLANClientState *vc = opaque;
 428     ssize_t ret;
 429
 430     if (vc->link_down) {
 431         return size;
 432     }
 433
 434     if (vc->receive_disabled) {
 435         return 0;
 436     }
 437
 438     if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
 439         ret = vc->info->receive_raw(vc, data, size);
 440     } else {
 441         ret = vc->info->receive(vc, data, size);
 442     }
 443
 444     if (ret == 0) {
 445         vc->receive_disabled = 1;
 446     };
 447
 448     return ret;
 449 }
 450
 451 static ssize_t qemu_vlan_deliver_packet(VLANClientState *sender,
 452                                         unsigned flags,
 453                                         const uint8_t *buf,
 454                                         size_t size,
 455                                         void *opaque)
 456 {
 457     VLANState *vlan = opaque;
 458     VLANClientState *vc;
 459     ssize_t ret = -1;
 460
 461     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 462         ssize_t len;
 463
 464         if (vc == sender) {
 465             continue;
 466         }
 467
 468         if (vc->link_down) {
 469             ret = size;
 470             continue;
 471         }
 472
 473         if (vc->receive_disabled) {
 474             ret = 0;
 475             continue;
 476         }
 477
 478         if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
 479             len = vc->info->receive_raw(vc, buf, size);
 480         } else {
 481             len = vc->info->receive(vc, buf, size);
 482         }
 483
 484         if (len == 0) {
 485             vc->receive_disabled = 1;
 486         }
 487
 488         ret = (ret >= 0) ? ret : len;
 489
 490     }
 491
 492     return ret;
 493 }
 494
 495 void qemu_purge_queued_packets(VLANClientState *vc)
 496 {
 497     NetQueue *queue;
 498
 499     if (!vc->peer && !vc->vlan) {
 500         return;
 501     }
 502
 503     if (vc->peer) {
 504         queue = vc->peer->send_queue;
 505     } else {
 506         queue = vc->vlan->send_queue;
 507     }
 508
 509     qemu_net_queue_purge(queue, vc);
 510 }
 511
 512 void qemu_flush_queued_packets(VLANClientState *vc)
 513 {
 514     NetQueue *queue;
 515
 516     vc->receive_disabled = 0;
 517
 518     if (vc->vlan) {
 519         queue = vc->vlan->send_queue;
 520     } else {
 521         queue = vc->send_queue;
 522     }
 523
 524     qemu_net_queue_flush(queue);
 525 }
 526
 527 static ssize_t qemu_send_packet_async_with_flags(VLANClientState *sender,
 528                                                  unsigned flags,
 529                                                  const uint8_t *buf, int size,
 530                                                  NetPacketSent *sent_cb)
 531 {
 532     NetQueue *queue;
 533
 534 #ifdef DEBUG_NET
 535     printf("qemu_send_packet_async:\n");
 536     hex_dump(stdout, buf, size);
 537 #endif
 538
 539     if (sender->link_down || (!sender->peer && !sender->vlan)) {
 540         return size;
 541     }
 542
 543     if (sender->peer) {
 544         queue = sender->peer->send_queue;
 545     } else {
 546         queue = sender->vlan->send_queue;
 547     }
 548
 549     return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
 550 }
 551
 552 ssize_t qemu_send_packet_async(VLANClientState *sender,
 553                                const uint8_t *buf, int size,
 554                                NetPacketSent *sent_cb)
 555 {
 556     return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
 557                                              buf, size, sent_cb);
 558 }
 559
 560 void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
 561 {
 562     qemu_send_packet_async(vc, buf, size, NULL);
 563 }
 564
 565 ssize_t qemu_send_packet_raw(VLANClientState *vc, const uint8_t *buf, int size)
 566 {
 567     return qemu_send_packet_async_with_flags(vc, QEMU_NET_PACKET_FLAG_RAW,
 568                                              buf, size, NULL);
 569 }
 570
 571 static ssize_t vc_sendv_compat(VLANClientState *vc, const struct iovec *iov,
 572                                int iovcnt)
 573 {
 574     uint8_t buffer[4096];
 575     size_t offset = 0;
 576     int i;
 577
 578     for (i = 0; i < iovcnt; i++) {
 579         size_t len;
 580
 581         len = MIN(sizeof(buffer) - offset, iov[i].iov_len);
 582         memcpy(buffer + offset, iov[i].iov_base, len);
 583         offset += len;
 584     }
 585
 586     return vc->info->receive(vc, buffer, offset);
 587 }
 588
 589 static ssize_t calc_iov_length(const struct iovec *iov, int iovcnt)
 590 {
 591     size_t offset = 0;
 592     int i;
 593
 594     for (i = 0; i < iovcnt; i++)
 595         offset += iov[i].iov_len;
 596     return offset;
 597 }
 598
 599 static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
 600                                        unsigned flags,
 601                                        const struct iovec *iov,
 602                                        int iovcnt,
 603                                        void *opaque)
 604 {
 605     VLANClientState *vc = opaque;
 606
 607     if (vc->link_down) {
 608         return calc_iov_length(iov, iovcnt);
 609     }
 610
 611     if (vc->info->receive_iov) {
 612         return vc->info->receive_iov(vc, iov, iovcnt);
 613     } else {
 614         return vc_sendv_compat(vc, iov, iovcnt);
 615     }
 616 }
 617
 618 static ssize_t qemu_vlan_deliver_packet_iov(VLANClientState *sender,
 619                                             unsigned flags,
 620                                             const struct iovec *iov,
 621                                             int iovcnt,
 622                                             void *opaque)
 623 {
 624     VLANState *vlan = opaque;
 625     VLANClientState *vc;
 626     ssize_t ret = -1;
 627
 628     QTAILQ_FOREACH(vc, &vlan->clients, next) {
 629         ssize_t len;
 630
 631         if (vc == sender) {
 632             continue;
 633         }
 634
 635         if (vc->link_down) {
 636             ret = calc_iov_length(iov, iovcnt);
 637             continue;
 638         }
 639
 640         assert(!(flags & QEMU_NET_PACKET_FLAG_RAW));
 641
 642         if (vc->info->receive_iov) {
 643             len = vc->info->receive_iov(vc, iov, iovcnt);
 644         } else {
 645             len = vc_sendv_compat(vc, iov, iovcnt);
 646         }
 647
 648         ret = (ret >= 0) ? ret : len;
 649     }
 650
 651     return ret;
 652 }
 653
 654 ssize_t qemu_sendv_packet_async(VLANClientState *sender,
 655                                 const struct iovec *iov, int iovcnt,
 656                                 NetPacketSent *sent_cb)
 657 {
 658     NetQueue *queue;
 659
 660     if (sender->link_down || (!sender->peer && !sender->vlan)) {
 661         return calc_iov_length(iov, iovcnt);
 662     }
 663
 664     if (sender->peer) {
 665         queue = sender->peer->send_queue;
 666     } else {
 667         queue = sender->vlan->send_queue;
 668     }
 669
 670     return qemu_net_queue_send_iov(queue, sender,
 671                                    QEMU_NET_PACKET_FLAG_NONE,
 672                                    iov, iovcnt, sent_cb);
 673 }
 674
 675 ssize_t
 676 qemu_sendv_packet(VLANClientState *vc, const struct iovec *iov, int iovcnt)
 677 {
 678     return qemu_sendv_packet_async(vc, iov, iovcnt, NULL);
 679 }
 680
 681 /* find or alloc a new VLAN */
 682 VLANState *qemu_find_vlan(int id, int allocate)
 683 {
 684     VLANState *vlan;
 685
 686     QTAILQ_FOREACH(vlan, &vlans, next) {
 687         if (vlan->id == id) {
 688             return vlan;
 689         }
 690     }
 691
 692     if (!allocate) {
 693         return NULL;
 694     }
 695
 696     vlan = qemu_mallocz(sizeof(VLANState));
 697     vlan->id = id;
 698     QTAILQ_INIT(&vlan->clients);
 699
 700     vlan->send_queue = qemu_new_net_queue(qemu_vlan_deliver_packet,
 701                                           qemu_vlan_deliver_packet_iov,
 702                                           vlan);
 703
 704     QTAILQ_INSERT_TAIL(&vlans, vlan, next);
 705
 706     return vlan;
 707 }
 708
 709 VLANClientState *qemu_find_netdev(const char *id)
 710 {
 711     VLANClientState *vc;
 712
 713     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
 714         if (!strcmp(vc->name, id)) {
 715             return vc;
 716         }
 717     }
 718
 719     return NULL;
 720 }
 721
 722 static int nic_get_free_idx(void)
 723 {
 724     int index;
 725
 726     for (index = 0; index < MAX_NICS; index++)
 727         if (!nd_table[index].used)
 728             return index;
 729     return -1;
 730 }
 731
 732 int qemu_show_nic_models(const char *arg, const char *const *models)
 733 {
 734     int i;
 735
 736     if (!arg || strcmp(arg, "?"))
 737         return 0;
 738
 739     fprintf(stderr, "qemu: Supported NIC models: ");
 740     for (i = 0 ; models[i]; i++)
 741         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
 742     return 1;
 743 }
 744
 745 void qemu_check_nic_model(NICInfo *nd, const char *model)
 746 {
 747     const char *models[2];
 748
 749     models[0] = model;
 750     models[1] = NULL;
 751
 752     if (qemu_show_nic_models(nd->model, models))
 753         exit(0);
 754     if (qemu_find_nic_model(nd, models, model) < 0)
 755         exit(1);
 756 }
 757
 758 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
 759                         const char *default_model)
 760 {
 761     int i;
 762
 763     if (!nd->model)
 764         nd->model = qemu_strdup(default_model);
 765
 766     for (i = 0 ; models[i]; i++) {
 767         if (strcmp(nd->model, models[i]) == 0)
 768             return i;
 769     }
 770
 771     error_report("qemu: Unsupported NIC model: %s", nd->model);
 772     return -1;
 773 }
 774
 775 int net_handle_fd_param(Monitor *mon, const char *param)
 776 {
 777     int fd;
 778
 779     if (!qemu_isdigit(param[0]) && mon) {
 780
 781         fd = monitor_get_fd(mon, param);
 782         if (fd == -1) {
 783             error_report("No file descriptor named %s found", param);
 784             return -1;
 785         }
 786     } else {
 787         char *endptr = NULL;
 788
 789         fd = strtol(param, &endptr, 10);
 790         if (*endptr || (fd == 0 && param == endptr)) {
 791             return -1;
 792         }
 793     }
 794
 795     return fd;
 796 }
 797
 798 static int net_init_nic(QemuOpts *opts,
 799                         Monitor *mon,
 800                         const char *name,
 801                         VLANState *vlan)
 802 {
 803     int idx;
 804     NICInfo *nd;
 805     const char *netdev;
 806
 807     idx = nic_get_free_idx();
 808     if (idx == -1 || nb_nics >= MAX_NICS) {
 809         error_report("Too Many NICs");
 810         return -1;
 811     }
 812
 813     nd = &nd_table[idx];
 814
 815     memset(nd, 0, sizeof(*nd));
 816
 817     if ((netdev = qemu_opt_get(opts, "netdev"))) {
 818         nd->netdev = qemu_find_netdev(netdev);
 819         if (!nd->netdev) {
 820             error_report("netdev '%s' not found", netdev);
 821             return -1;
 822         }
 823     } else {
 824         assert(vlan);
 825         nd->vlan = vlan;
 826     }
 827     if (name) {
 828         nd->name = qemu_strdup(name);
 829     }
 830     if (qemu_opt_get(opts, "model")) {
 831         nd->model = qemu_strdup(qemu_opt_get(opts, "model"));
 832     }
 833     if (qemu_opt_get(opts, "addr")) {
 834         nd->devaddr = qemu_strdup(qemu_opt_get(opts, "addr"));
 835     }
 836
 837     nd->macaddr[0] = 0x52;
 838     nd->macaddr[1] = 0x54;
 839     nd->macaddr[2] = 0x00;
 840     nd->macaddr[3] = 0x12;
 841     nd->macaddr[4] = 0x34;
 842     nd->macaddr[5] = 0x56 + idx;
 843
 844     if (qemu_opt_get(opts, "macaddr") &&
 845         net_parse_macaddr(nd->macaddr, qemu_opt_get(opts, "macaddr")) < 0) {
 846         error_report("invalid syntax for ethernet address");
 847         return -1;
 848     }
 849
 850     nd->nvectors = qemu_opt_get_number(opts, "vectors",
 851                                        DEV_NVECTORS_UNSPECIFIED);
 852     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
 853         (nd->nvectors < 0 || nd->nvectors > 0x7ffffff)) {
 854         error_report("invalid # of vectors: %d", nd->nvectors);
 855         return -1;
 856     }
 857
 858     nd->used = 1;
 859     nb_nics++;
 860
 861     return idx;
 862 }
 863
 864 #define NET_COMMON_PARAMS_DESC                     \
 865     {                                              \
 866         .name = "type",                            \
 867         .type = QEMU_OPT_STRING,                   \
 868         .help = "net client type (nic, tap etc.)", \
 869      }, {                                          \
 870         .name = "vlan",                            \
 871         .type = QEMU_OPT_NUMBER,                   \
 872         .help = "vlan number",                     \
 873      }, {                                          \
 874         .name = "name",                            \
 875         .type = QEMU_OPT_STRING,                   \
 876         .help = "identifier for monitor commands", \
 877      }
 878
 879 typedef int (*net_client_init_func)(QemuOpts *opts,
 880                                     Monitor *mon,
 881                                     const char *name,
 882                                     VLANState *vlan);
 883
 884 /* magic number, but compiler will warn if too small */
 885 #define NET_MAX_DESC 20
 886
 887 static const struct {
 888     const char *type;
 889     net_client_init_func init;
 890     QemuOptDesc desc[NET_MAX_DESC];
 891 } net_client_types[] = {
 892     {
 893         .type = "none",
 894         .desc = {
 895             NET_COMMON_PARAMS_DESC,
 896             { /* end of list */ }
 897         },
 898     }, {
 899         .type = "nic",
 900         .init = net_init_nic,
 901         .desc = {
 902             NET_COMMON_PARAMS_DESC,
 903             {
 904                 .name = "netdev",
 905                 .type = QEMU_OPT_STRING,
 906                 .help = "id of -netdev to connect to",
 907             },
 908             {
 909                 .name = "macaddr",
 910                 .type = QEMU_OPT_STRING,
 911                 .help = "MAC address",
 912             }, {
 913                 .name = "model",
 914                 .type = QEMU_OPT_STRING,
 915                 .help = "device model (e1000, rtl8139, virtio etc.)",
 916             }, {
 917                 .name = "addr",
 918                 .type = QEMU_OPT_STRING,
 919                 .help = "PCI device address",
 920             }, {
 921                 .name = "vectors",
 922                 .type = QEMU_OPT_NUMBER,
 923                 .help = "number of MSI-x vectors, 0 to disable MSI-X",
 924             },
 925             { /* end of list */ }
 926         },
 927 #ifdef CONFIG_SLIRP
 928     }, {
 929         .type = "user",
 930         .init = net_init_slirp,
 931         .desc = {
 932             NET_COMMON_PARAMS_DESC,
 933             {
 934                 .name = "hostname",
 935                 .type = QEMU_OPT_STRING,
 936                 .help = "client hostname reported by the builtin DHCP server",
 937             }, {
 938                 .name = "restrict",
 939                 .type = QEMU_OPT_STRING,
 940                 .help = "isolate the guest from the host (y|yes|n|no)",
 941             }, {
 942                 .name = "ip",
 943                 .type = QEMU_OPT_STRING,
 944                 .help = "legacy parameter, use net= instead",
 945             }, {
 946                 .name = "net",
 947                 .type = QEMU_OPT_STRING,
 948                 .help = "IP address and optional netmask",
 949             }, {
 950                 .name = "host",
 951                 .type = QEMU_OPT_STRING,
 952                 .help = "guest-visible address of the host",
 953             }, {
 954                 .name = "tftp",
 955                 .type = QEMU_OPT_STRING,
 956                 .help = "root directory of the built-in TFTP server",
 957             }, {
 958                 .name = "bootfile",
 959                 .type = QEMU_OPT_STRING,
 960                 .help = "BOOTP filename, for use with tftp=",
 961             }, {
 962                 .name = "dhcpstart",
 963                 .type = QEMU_OPT_STRING,
 964                 .help = "the first of the 16 IPs the built-in DHCP server can assign",
 965             }, {
 966                 .name = "dns",
 967                 .type = QEMU_OPT_STRING,
 968                 .help = "guest-visible address of the virtual nameserver",
 969             }, {
 970                 .name = "smb",
 971                 .type = QEMU_OPT_STRING,
 972                 .help = "root directory of the built-in SMB server",
 973             }, {
 974                 .name = "smbserver",
 975                 .type = QEMU_OPT_STRING,
 976                 .help = "IP address of the built-in SMB server",
 977             }, {
 978                 .name = "hostfwd",
 979                 .type = QEMU_OPT_STRING,
 980                 .help = "guest port number to forward incoming TCP or UDP connections",
 981             }, {
 982                 .name = "guestfwd",
 983                 .type = QEMU_OPT_STRING,
 984                 .help = "IP address and port to forward guest TCP connections",
 985             },
 986             { /* end of list */ }
 987         },
 988 #endif
 989     }, {
 990         .type = "tap",
 991         .init = net_init_tap,
 992         .desc = {
 993             NET_COMMON_PARAMS_DESC,
 994             {
 995                 .name = "ifname",
 996                 .type = QEMU_OPT_STRING,
 997                 .help = "interface name",
 998             },
 999 #ifndef _WIN32
1000             {
1001                 .name = "fd",
1002                 .type = QEMU_OPT_STRING,
1003                 .help = "file descriptor of an already opened tap",
1004             }, {
1005                 .name = "script",
1006                 .type = QEMU_OPT_STRING,
1007                 .help = "script to initialize the interface",
1008             }, {
1009                 .name = "downscript",
1010                 .type = QEMU_OPT_STRING,
1011                 .help = "script to shut down the interface",
1012             }, {
1013                 .name = "sndbuf",
1014                 .type = QEMU_OPT_SIZE,
1015                 .help = "send buffer limit"
1016             }, {
1017                 .name = "vnet_hdr",
1018                 .type = QEMU_OPT_BOOL,
1019                 .help = "enable the IFF_VNET_HDR flag on the tap interface"
1020             }, {
1021                 .name = "vhost",
1022                 .type = QEMU_OPT_BOOL,
1023                 .help = "enable vhost-net network accelerator",
1024             }, {
1025                 .name = "vhostfd",
1026                 .type = QEMU_OPT_STRING,
1027                 .help = "file descriptor of an already opened vhost net device",
1028             },
1029 #endif /* _WIN32 */
1030             { /* end of list */ }
1031         },
1032     }, {
1033         .type = "socket",
1034         .init = net_init_socket,
1035         .desc = {
1036             NET_COMMON_PARAMS_DESC,
1037             {
1038                 .name = "fd",
1039                 .type = QEMU_OPT_STRING,
1040                 .help = "file descriptor of an already opened socket",
1041             }, {
1042                 .name = "listen",
1043                 .type = QEMU_OPT_STRING,
1044                 .help = "port number, and optional hostname, to listen on",
1045             }, {
1046                 .name = "connect",
1047                 .type = QEMU_OPT_STRING,
1048                 .help = "port number, and optional hostname, to connect to",
1049             }, {
1050                 .name = "mcast",
1051                 .type = QEMU_OPT_STRING,
1052                 .help = "UDP multicast address and port number",
1053             }, {
1054                 .name = "localaddr",
1055                 .type = QEMU_OPT_STRING,
1056                 .help = "source address for multicast packets",
1057             },
1058             { /* end of list */ }
1059         },
1060 #ifdef CONFIG_VDE
1061     }, {
1062         .type = "vde",
1063         .init = net_init_vde,
1064         .desc = {
1065             NET_COMMON_PARAMS_DESC,
1066             {
1067                 .name = "sock",
1068                 .type = QEMU_OPT_STRING,
1069                 .help = "socket path",
1070             }, {
1071                 .name = "port",
1072                 .type = QEMU_OPT_NUMBER,
1073                 .help = "port number",
1074             }, {
1075                 .name = "group",
1076                 .type = QEMU_OPT_STRING,
1077                 .help = "group owner of socket",
1078             }, {
1079                 .name = "mode",
1080                 .type = QEMU_OPT_NUMBER,
1081                 .help = "permissions for socket",
1082             },
1083             { /* end of list */ }
1084         },
1085 #endif
1086     }, {
1087         .type = "dump",
1088         .init = net_init_dump,
1089         .desc = {
1090             NET_COMMON_PARAMS_DESC,
1091             {
1092                 .name = "len",
1093                 .type = QEMU_OPT_SIZE,
1094                 .help = "per-packet size limit (64k default)",
1095             }, {
1096                 .name = "file",
1097                 .type = QEMU_OPT_STRING,
1098                 .help = "dump file path (default is qemu-vlan0.pcap)",
1099             },
1100             { /* end of list */ }
1101         },
1102     },
1103     { /* end of list */ }
1104 };
1105
1106 int net_client_init(Monitor *mon, QemuOpts *opts, int is_netdev)
1107 {
1108     const char *name;
1109     const char *type;
1110     int i;
1111
1112     type = qemu_opt_get(opts, "type");
1113     if (!type) {
1114         qerror_report(QERR_MISSING_PARAMETER, "type");
1115         return -1;
1116     }
1117
1118     if (is_netdev) {
1119         if (strcmp(type, "tap") != 0 &&
1120 #ifdef CONFIG_SLIRP
1121             strcmp(type, "user") != 0 &&
1122 #endif
1123 #ifdef CONFIG_VDE
1124             strcmp(type, "vde") != 0 &&
1125 #endif
1126             strcmp(type, "socket") != 0) {
1127             qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
1128                           "a netdev backend type");
1129             return -1;
1130         }
1131
1132         if (qemu_opt_get(opts, "vlan")) {
1133             qerror_report(QERR_INVALID_PARAMETER, "vlan");
1134             return -1;
1135         }
1136         if (qemu_opt_get(opts, "name")) {
1137             qerror_report(QERR_INVALID_PARAMETER, "name");
1138             return -1;
1139         }
1140         if (!qemu_opts_id(opts)) {
1141             qerror_report(QERR_MISSING_PARAMETER, "id");
1142             return -1;
1143         }
1144     }
1145
1146     name = qemu_opts_id(opts);
1147     if (!name) {
1148         name = qemu_opt_get(opts, "name");
1149     }
1150
1151     for (i = 0; net_client_types[i].type != NULL; i++) {
1152         if (!strcmp(net_client_types[i].type, type)) {
1153             VLANState *vlan = NULL;
1154             int ret;
1155
1156             if (qemu_opts_validate(opts, &net_client_types[i].desc[0]) == -1) {
1157                 return -1;
1158             }
1159
1160             /* Do not add to a vlan if it's a -netdev or a nic with a
1161              * netdev= parameter. */
1162             if (!(is_netdev ||
1163                   (strcmp(type, "nic") == 0 && qemu_opt_get(opts, "netdev")))) {
1164                 vlan = qemu_find_vlan(qemu_opt_get_number(opts, "vlan", 0), 1);
1165             }
1166
1167             ret = 0;
1168             if (net_client_types[i].init) {
1169                 ret = net_client_types[i].init(opts, mon, name, vlan);
1170                 if (ret < 0) {
1171                     /* TODO push error reporting into init() methods */
1172                     qerror_report(QERR_DEVICE_INIT_FAILED, type);
1173                     return -1;
1174                 }
1175             }
1176             return ret;
1177         }
1178     }
1179
1180     qerror_report(QERR_INVALID_PARAMETER_VALUE, "type",
1181                   "a network client type");
1182     return -1;
1183 }
1184
1185 static int net_host_check_device(const char *device)
1186 {
1187     int i;
1188     const char *valid_param_list[] = { "tap", "socket", "dump"
1189 #ifdef CONFIG_SLIRP
1190                                        ,"user"
1191 #endif
1192 #ifdef CONFIG_VDE
1193                                        ,"vde"
1194 #endif
1195     };
1196     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
1197         if (!strncmp(valid_param_list[i], device,
1198                      strlen(valid_param_list[i])))
1199             return 1;
1200     }
1201
1202     return 0;
1203 }
1204
1205 void net_host_device_add(Monitor *mon, const QDict *qdict)
1206 {
1207     const char *device = qdict_get_str(qdict, "device");
1208     const char *opts_str = qdict_get_try_str(qdict, "opts");
1209     QemuOpts *opts;
1210
1211     if (!net_host_check_device(device)) {
1212         monitor_printf(mon, "invalid host network device %s\n", device);
1213         return;
1214     }
1215
1216     opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
1217     if (!opts) {
1218         return;
1219     }
1220
1221     qemu_opt_set(opts, "type", device);
1222
1223     if (net_client_init(mon, opts, 0) < 0) {
1224         monitor_printf(mon, "adding host network device %s failed\n", device);
1225     }
1226 }
1227
1228 void net_host_device_remove(Monitor *mon, const QDict *qdict)
1229 {
1230     VLANClientState *vc;
1231     int vlan_id = qdict_get_int(qdict, "vlan_id");
1232     const char *device = qdict_get_str(qdict, "device");
1233
1234     vc = qemu_find_vlan_client_by_name(mon, vlan_id, device);
1235     if (!vc) {
1236         return;
1237     }
1238     if (!net_host_check_device(vc->model)) {
1239         monitor_printf(mon, "invalid host network device %s\n", device);
1240         return;
1241     }
1242     qemu_del_vlan_client(vc);
1243 }
1244
1245 int do_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
1246 {
1247     QemuOpts *opts;
1248     int res;
1249
1250     opts = qemu_opts_from_qdict(qemu_find_opts("netdev"), qdict);
1251     if (!opts) {
1252         return -1;
1253     }
1254
1255     res = net_client_init(mon, opts, 1);
1256     if (res < 0) {
1257         qemu_opts_del(opts);
1258     }
1259
1260     return res;
1261 }
1262
1263 int do_netdev_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
1264 {
1265     const char *id = qdict_get_str(qdict, "id");
1266     VLANClientState *vc;
1267
1268     vc = qemu_find_netdev(id);
1269     if (!vc || vc->info->type == NET_CLIENT_TYPE_NIC) {
1270         qerror_report(QERR_DEVICE_NOT_FOUND, id);
1271         return -1;
1272     }
1273     qemu_del_vlan_client(vc);
1274     qemu_opts_del(qemu_opts_find(qemu_find_opts("netdev"), id));
1275     return 0;
1276 }
1277
1278 void do_info_network(Monitor *mon)
1279 {
1280     VLANState *vlan;
1281     VLANClientState *vc;
1282
1283     QTAILQ_FOREACH(vlan, &vlans, next) {
1284         monitor_printf(mon, "VLAN %d devices:\n", vlan->id);
1285
1286         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1287             monitor_printf(mon, "  %s: %s\n", vc->name, vc->info_str);
1288         }
1289     }
1290     monitor_printf(mon, "Devices not on any VLAN:\n");
1291     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1292         monitor_printf(mon, "  %s: %s", vc->name, vc->info_str);
1293         if (vc->peer) {
1294             monitor_printf(mon, " peer=%s", vc->peer->name);
1295         }
1296         monitor_printf(mon, "\n");
1297     }
1298 }
1299
1300 int do_set_link(Monitor *mon, const QDict *qdict, QObject **ret_data)
1301 {
1302     VLANState *vlan;
1303     VLANClientState *vc = NULL;
1304     const char *name = qdict_get_str(qdict, "name");
1305     int up = qdict_get_bool(qdict, "up");
1306
1307     QTAILQ_FOREACH(vlan, &vlans, next) {
1308         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1309             if (strcmp(vc->name, name) == 0) {
1310                 goto done;
1311             }
1312         }
1313     }
1314     vc = qemu_find_netdev(name);
1315 done:
1316
1317     if (!vc) {
1318         qerror_report(QERR_DEVICE_NOT_FOUND, name);
1319         return -1;
1320     }
1321
1322     vc->link_down = !up;
1323
1324     if (vc->info->link_status_changed) {
1325         vc->info->link_status_changed(vc);
1326     }
1327
1328     /* Notify peer. Don't update peer link status: this makes it possible to
1329      * disconnect from host network without notifying the guest.
1330      * FIXME: is disconnected link status change operation useful?
1331      *
1332      * Current behaviour is compatible with qemu vlans where there could be
1333      * multiple clients that can still communicate with each other in
1334      * disconnected mode. For now maintain this compatibility. */
1335     if (vc->peer && vc->peer->info->link_status_changed) {
1336         vc->peer->info->link_status_changed(vc->peer);
1337     }
1338     return 0;
1339 }
1340
1341 void net_cleanup(void)
1342 {
1343     VLANState *vlan;
1344     VLANClientState *vc, *next_vc;
1345
1346     QTAILQ_FOREACH(vlan, &vlans, next) {
1347         QTAILQ_FOREACH_SAFE(vc, &vlan->clients, next, next_vc) {
1348             qemu_del_vlan_client(vc);
1349         }
1350     }
1351
1352     QTAILQ_FOREACH_SAFE(vc, &non_vlan_clients, next, next_vc) {
1353         qemu_del_vlan_client(vc);
1354     }
1355 }
1356
1357 void net_check_clients(void)
1358 {
1359     VLANState *vlan;
1360     VLANClientState *vc;
1361     int has_nic = 0, has_host_dev = 0;
1362
1363     QTAILQ_FOREACH(vlan, &vlans, next) {
1364         QTAILQ_FOREACH(vc, &vlan->clients, next) {
1365             switch (vc->info->type) {
1366             case NET_CLIENT_TYPE_NIC:
1367                 has_nic = 1;
1368                 break;
1369             case NET_CLIENT_TYPE_SLIRP:
1370             case NET_CLIENT_TYPE_TAP:
1371             case NET_CLIENT_TYPE_SOCKET:
1372             case NET_CLIENT_TYPE_VDE:
1373                 has_host_dev = 1;
1374                 break;
1375             default: ;
1376             }
1377         }
1378         if (has_host_dev && !has_nic)
1379             fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);
1380         if (has_nic && !has_host_dev)
1381             fprintf(stderr,
1382                     "Warning: vlan %d is not connected to host network\n",
1383                     vlan->id);
1384     }
1385     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
1386         if (!vc->peer) {
1387             fprintf(stderr, "Warning: %s %s has no peer\n",
1388                     vc->info->type == NET_CLIENT_TYPE_NIC ? "nic" : "netdev",
1389                     vc->name);
1390         }
1391     }
1392 }
1393
1394 static int net_init_client(QemuOpts *opts, void *dummy)
1395 {
1396     if (net_client_init(NULL, opts, 0) < 0)
1397         return -1;
1398     return 0;
1399 }
1400
1401 static int net_init_netdev(QemuOpts *opts, void *dummy)
1402 {
1403     return net_client_init(NULL, opts, 1);
1404 }
1405
1406 int net_init_clients(void)
1407 {
1408     QemuOptsList *net = qemu_find_opts("net");
1409
1410     if (default_net) {
1411         /* if no clients, we use a default config */
1412         qemu_opts_set(net, NULL, "type", "nic");
1413 #ifdef CONFIG_SLIRP
1414         qemu_opts_set(net, NULL, "type", "user");
1415 #endif
1416     }
1417
1418     QTAILQ_INIT(&vlans);
1419     QTAILQ_INIT(&non_vlan_clients);
1420
1421     if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1422         return -1;
1423
1424     if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1425         return -1;
1426     }
1427
1428     return 0;
1429 }
1430
1431 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1432 {
1433 #if defined(CONFIG_SLIRP)
1434     int ret;
1435     if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1436         return ret;
1437     }
1438 #endif
1439
1440     if (!qemu_opts_parse(opts_list, optarg, 1)) {
1441         return -1;
1442     }
1443
1444     default_net = 0;
1445     return 0;
1446 }