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 "qemu-common.h"
  25 #include "net.h"
  26 #include "console.h"
  27 #include "sysemu.h"
  28 #include "qemu-timer.h"
  29 #include "qemu-char.h"
  30 #include "audio/audio.h"
  31
  32 #include <unistd.h>
  33 #include <fcntl.h>
  34 #include <signal.h>
  35 #include <time.h>
  36 #include <errno.h>
  37 #include <sys/time.h>
  38 #include <zlib.h>
  39
  40 #ifndef _WIN32
  41 #include <sys/times.h>
  42 #include <sys/wait.h>
  43 #include <termios.h>
  44 #include <sys/mman.h>
  45 #include <sys/ioctl.h>
  46 #include <sys/resource.h>
  47 #include <sys/socket.h>
  48 #include <netinet/in.h>
  49 #include <net/if.h>
  50 #ifdef __NetBSD__
  51 #include <net/if_tap.h>
  52 #endif
  53 #ifdef __linux__
  54 #include <linux/if_tun.h>
  55 #endif
  56 #include <arpa/inet.h>
  57 #include <dirent.h>
  58 #include <netdb.h>
  59 #include <sys/select.h>
  60 #ifdef _BSD
  61 #include <sys/stat.h>
  62 #ifdef __FreeBSD__
  63 #include <libutil.h>
  64 #else
  65 #include <util.h>
  66 #endif
  67 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
  68 #include <freebsd/stdlib.h>
  69 #else
  70 #ifdef __linux__
  71 #include <pty.h>
  72 #include <malloc.h>
  73 #include <linux/rtc.h>
  74
  75 /* For the benefit of older linux systems which don't supply it,
  76    we use a local copy of hpet.h. */
  77 /* #include <linux/hpet.h> */
  78 #include "hpet.h"
  79
  80 #include <linux/ppdev.h>
  81 #include <linux/parport.h>
  82 #endif
  83 #ifdef __sun__
  84 #include <sys/stat.h>
  85 #include <sys/ethernet.h>
  86 #include <sys/sockio.h>
  87 #include <netinet/arp.h>
  88 #include <netinet/in.h>
  89 #include <netinet/in_systm.h>
  90 #include <netinet/ip.h>
  91 #include <netinet/ip_icmp.h> // must come after ip.h
  92 #include <netinet/udp.h>
  93 #include <netinet/tcp.h>
  94 #include <net/if.h>
  95 #include <syslog.h>
  96 #include <stropts.h>
  97 #endif
  98 #endif
  99 #endif
 100
 101 #include "qemu_socket.h"
 102
 103 #if defined(CONFIG_SLIRP)
 104 #include "libslirp.h"
 105 #endif
 106
 107 #if defined(__OpenBSD__)
 108 #include <util.h>
 109 #endif
 110
 111 #if defined(CONFIG_VDE)
 112 #include <libvdeplug.h>
 113 #endif
 114
 115 #ifdef _WIN32
 116 #include <malloc.h>
 117 #include <sys/timeb.h>
 118 #include <mmsystem.h>
 119 #define getopt_long_only getopt_long
 120 #define memalign(align, size) malloc(size)
 121 #endif
 122
 123 // FIXME: #include "qemu-kvm.h"
 124
 125 static VLANState *first_vlan;
 126
 127 /***********************************************************/
 128 /* network device redirectors */
 129
 130 #if defined(DEBUG_NET) || defined(DEBUG_SLIRP)
 131 static void hex_dump(FILE *f, const uint8_t *buf, int size)
 132 {
 133     int len, i, j, c;
 134
 135     for(i=0;i<size;i+=16) {
 136         len = size - i;
 137         if (len > 16)
 138             len = 16;
 139         fprintf(f, "%08x ", i);
 140         for(j=0;j<16;j++) {
 141             if (j < len)
 142                 fprintf(f, " %02x", buf[i+j]);
 143             else
 144                 fprintf(f, "   ");
 145         }
 146         fprintf(f, " ");
 147         for(j=0;j<len;j++) {
 148             c = buf[i+j];
 149             if (c < ' ' || c > '~')
 150                 c = '.';
 151             fprintf(f, "%c", c);
 152         }
 153         fprintf(f, "\n");
 154     }
 155 }
 156 #endif
 157
 158 static int parse_macaddr(uint8_t *macaddr, const char *p)
 159 {
 160     int i;
 161     char *last_char;
 162     long int offset;
 163
 164     errno = 0;
 165     offset = strtol(p, &last_char, 0);
 166     if (0 == errno && '\0' == *last_char &&
 167             offset >= 0 && offset <= 0xFFFFFF) {
 168         macaddr[3] = (offset & 0xFF0000) >> 16;
 169         macaddr[4] = (offset & 0xFF00) >> 8;
 170         macaddr[5] = offset & 0xFF;
 171         return 0;
 172     } else {
 173         for(i = 0; i < 6; i++) {
 174             macaddr[i] = strtol(p, (char **)&p, 16);
 175             if (i == 5) {
 176                 if (*p != '\0')
 177                     return -1;
 178             } else {
 179                 if (*p != ':' && *p != '-')
 180                     return -1;
 181                 p++;
 182             }
 183         }
 184         return 0;
 185     }
 186
 187     return -1;
 188 }
 189
 190 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
 191 {
 192     const char *p, *p1;
 193     int len;
 194     p = *pp;
 195     p1 = strchr(p, sep);
 196     if (!p1)
 197         return -1;
 198     len = p1 - p;
 199     p1++;
 200     if (buf_size > 0) {
 201         if (len > buf_size - 1)
 202             len = buf_size - 1;
 203         memcpy(buf, p, len);
 204         buf[len] = '\0';
 205     }
 206     *pp = p1;
 207     return 0;
 208 }
 209
 210 int parse_host_src_port(struct sockaddr_in *haddr,
 211                         struct sockaddr_in *saddr,
 212                         const char *input_str)
 213 {
 214     char *str = strdup(input_str);
 215     char *host_str = str;
 216     char *src_str;
 217     const char *src_str2;
 218     char *ptr;
 219
 220     /*
 221      * Chop off any extra arguments at the end of the string which
 222      * would start with a comma, then fill in the src port information
 223      * if it was provided else use the "any address" and "any port".
 224      */
 225     if ((ptr = strchr(str,',')))
 226         *ptr = '\0';
 227
 228     if ((src_str = strchr(input_str,'@'))) {
 229         *src_str = '\0';
 230         src_str++;
 231     }
 232
 233     if (parse_host_port(haddr, host_str) < 0)
 234         goto fail;
 235
 236     src_str2 = src_str;
 237     if (!src_str || *src_str == '\0')
 238         src_str2 = ":0";
 239
 240     if (parse_host_port(saddr, src_str2) < 0)
 241         goto fail;
 242
 243     free(str);
 244     return(0);
 245
 246 fail:
 247     free(str);
 248     return -1;
 249 }
 250
 251 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 252 {
 253     char buf[512];
 254     struct hostent *he;
 255     const char *p, *r;
 256     int port;
 257
 258     p = str;
 259     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 260         return -1;
 261     saddr->sin_family = AF_INET;
 262     if (buf[0] == '\0') {
 263         saddr->sin_addr.s_addr = 0;
 264     } else {
 265         if (qemu_isdigit(buf[0])) {
 266             if (!inet_aton(buf, &saddr->sin_addr))
 267                 return -1;
 268         } else {
 269             if ((he = gethostbyname(buf)) == NULL)
 270                 return - 1;
 271             saddr->sin_addr = *(struct in_addr *)he->h_addr;
 272         }
 273     }
 274     port = strtol(p, (char **)&r, 0);
 275     if (r == p)
 276         return -1;
 277     saddr->sin_port = htons(port);
 278     return 0;
 279 }
 280
 281 #if !defined(_WIN32) && 0
 282 static int parse_unix_path(struct sockaddr_un *uaddr, const char *str)
 283 {
 284     const char *p;
 285     int len;
 286
 287     len = MIN(108, strlen(str));
 288     p = strchr(str, ',');
 289     if (p)
 290         len = MIN(len, p - str);
 291
 292     memset(uaddr, 0, sizeof(*uaddr));
 293
 294     uaddr->sun_family = AF_UNIX;
 295     memcpy(uaddr->sun_path, str, len);
 296
 297     return 0;
 298 }
 299 #endif
 300
 301 void qemu_format_nic_info_str(VLANClientState *vc, uint8_t macaddr[6])
 302 {
 303     snprintf(vc->info_str, sizeof(vc->info_str),
 304              "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
 305              vc->model,
 306              macaddr[0], macaddr[1], macaddr[2],
 307              macaddr[3], macaddr[4], macaddr[5]);
 308 }
 309
 310 static char *assign_name(VLANClientState *vc1, const char *model)
 311 {
 312     VLANState *vlan;
 313     char buf[256];
 314     int id = 0;
 315
 316     for (vlan = first_vlan; vlan; vlan = vlan->next) {
 317         VLANClientState *vc;
 318
 319         for (vc = vlan->first_client; vc; vc = vc->next)
 320             if (vc != vc1 && strcmp(vc->model, model) == 0)
 321                 id++;
 322     }
 323
 324     snprintf(buf, sizeof(buf), "%s.%d", model, id);
 325
 326     return strdup(buf);
 327 }
 328
 329 VLANClientState *qemu_new_vlan_client(VLANState *vlan,
 330                                       const char *model,
 331                                       const char *name,
 332                                       IOReadHandler *fd_read,
 333                                       IOCanRWHandler *fd_can_read,
 334                                       NetCleanup *cleanup,
 335                                       void *opaque)
 336 {
 337     VLANClientState *vc, **pvc;
 338     vc = qemu_mallocz(sizeof(VLANClientState));
 339     vc->model = strdup(model);
 340     if (name)
 341         vc->name = strdup(name);
 342     else
 343         vc->name = assign_name(vc, model);
 344     vc->fd_read = fd_read;
 345     vc->fd_can_read = fd_can_read;
 346     vc->cleanup = cleanup;
 347     vc->opaque = opaque;
 348     vc->vlan = vlan;
 349
 350     vc->next = NULL;
 351     pvc = &vlan->first_client;
 352     while (*pvc != NULL)
 353         pvc = &(*pvc)->next;
 354     *pvc = vc;
 355     return vc;
 356 }
 357
 358 void qemu_del_vlan_client(VLANClientState *vc)
 359 {
 360     VLANClientState **pvc = &vc->vlan->first_client;
 361
 362     while (*pvc != NULL)
 363         if (*pvc == vc) {
 364             *pvc = vc->next;
 365             if (vc->cleanup) {
 366                 vc->cleanup(vc);
 367             }
 368             free(vc->name);
 369             free(vc->model);
 370             qemu_free(vc);
 371             break;
 372         } else
 373             pvc = &(*pvc)->next;
 374 }
 375
 376 VLANClientState *qemu_find_vlan_client(VLANState *vlan, void *opaque)
 377 {
 378     VLANClientState **pvc = &vlan->first_client;
 379
 380     while (*pvc != NULL)
 381         if ((*pvc)->opaque == opaque)
 382             return *pvc;
 383         else
 384             pvc = &(*pvc)->next;
 385
 386     return NULL;
 387 }
 388
 389 int qemu_can_send_packet(VLANClientState *vc1)
 390 {
 391     VLANState *vlan = vc1->vlan;
 392     VLANClientState *vc;
 393
 394     for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
 395         if (vc != vc1) {
 396             if (vc->fd_can_read && vc->fd_can_read(vc->opaque))
 397                 return 1;
 398         }
 399     }
 400     return 0;
 401 }
 402
 403 int qemu_send_packet(VLANClientState *vc1, const uint8_t *buf, int size)
 404 {
 405     VLANState *vlan = vc1->vlan;
 406     VLANClientState *vc;
 407     int ret = -EAGAIN;
 408
 409     if (vc1->link_down)
 410         return 0;
 411
 412 #ifdef DEBUG_NET
 413     printf("vlan %d send:\n", vlan->id);
 414     hex_dump(stdout, buf, size);
 415 #endif
 416     for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
 417         if (vc != vc1 && !vc->link_down) {
 418             if (!vc->fd_can_read || vc->fd_can_read(vc->opaque)) {
 419                 vc->fd_read(vc->opaque, buf, size);
 420                 ret = 0;
 421             }
 422         }
 423     }
 424     return ret;
 425 }
 426
 427 static ssize_t vc_sendv_compat(VLANClientState *vc, const struct iovec *iov,
 428                                int iovcnt)
 429 {
 430     uint8_t buffer[4096];
 431     size_t offset = 0;
 432     int i;
 433
 434     for (i = 0; i < iovcnt; i++) {
 435         size_t len;
 436
 437         len = MIN(sizeof(buffer) - offset, iov[i].iov_len);
 438         memcpy(buffer + offset, iov[i].iov_base, len);
 439         offset += len;
 440     }
 441
 442     vc->fd_read(vc->opaque, buffer, offset);
 443
 444     return offset;
 445 }
 446
 447 static ssize_t calc_iov_length(const struct iovec *iov, int iovcnt)
 448 {
 449     size_t offset = 0;
 450     int i;
 451
 452     for (i = 0; i < iovcnt; i++)
 453         offset += iov[i].iov_len;
 454     return offset;
 455 }
 456
 457 ssize_t qemu_sendv_packet(VLANClientState *vc1, const struct iovec *iov,
 458                           int iovcnt)
 459 {
 460     VLANState *vlan = vc1->vlan;
 461     VLANClientState *vc;
 462     ssize_t max_len = 0;
 463
 464     if (vc1->link_down)
 465         return calc_iov_length(iov, iovcnt);
 466
 467     for (vc = vlan->first_client; vc != NULL; vc = vc->next) {
 468         ssize_t len = 0;
 469
 470         if (vc == vc1)
 471             continue;
 472
 473         if (vc->link_down)
 474             len = calc_iov_length(iov, iovcnt);
 475         if (vc->fd_readv)
 476             len = vc->fd_readv(vc->opaque, iov, iovcnt);
 477         else if (vc->fd_read)
 478             len = vc_sendv_compat(vc, iov, iovcnt);
 479
 480         max_len = MAX(max_len, len);
 481     }
 482
 483     return max_len;
 484 }
 485
 486 #if defined(CONFIG_SLIRP)
 487
 488 /* slirp network adapter */
 489
 490 static int slirp_inited;
 491 static int slirp_restrict;
 492 static char *slirp_ip;
 493 static VLANClientState *slirp_vc;
 494
 495 int slirp_can_output(void)
 496 {
 497     return !slirp_vc || qemu_can_send_packet(slirp_vc);
 498 }
 499
 500 void slirp_output(const uint8_t *pkt, int pkt_len)
 501 {
 502 #ifdef DEBUG_SLIRP
 503     printf("slirp output:\n");
 504     hex_dump(stdout, pkt, pkt_len);
 505 #endif
 506     if (!slirp_vc)
 507         return;
 508     qemu_send_packet(slirp_vc, pkt, pkt_len);
 509 }
 510
 511 int slirp_is_inited(void)
 512 {
 513     return slirp_inited;
 514 }
 515
 516 static void slirp_receive(void *opaque, const uint8_t *buf, int size)
 517 {
 518 #ifdef DEBUG_SLIRP
 519     printf("slirp input:\n");
 520     hex_dump(stdout, buf, size);
 521 #endif
 522     slirp_input(buf, size);
 523 }
 524
 525 static int net_slirp_init(VLANState *vlan, const char *model, const char *name)
 526 {
 527     if (!slirp_inited) {
 528         slirp_inited = 1;
 529         slirp_init(slirp_restrict, slirp_ip);
 530     }
 531     slirp_vc = qemu_new_vlan_client(vlan, model, name,
 532                                     slirp_receive, NULL, NULL, NULL);
 533     slirp_vc->info_str[0] = '\0';
 534     return 0;
 535 }
 536
 537 void net_slirp_redir(const char *redir_str)
 538 {
 539     int is_udp;
 540     char buf[256], *r;
 541     const char *p;
 542     struct in_addr guest_addr;
 543     int host_port, guest_port;
 544
 545     if (!slirp_inited) {
 546         slirp_inited = 1;
 547         slirp_init(slirp_restrict, slirp_ip);
 548     }
 549
 550     p = redir_str;
 551     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 552         goto fail;
 553     if (!strcmp(buf, "tcp")) {
 554         is_udp = 0;
 555     } else if (!strcmp(buf, "udp")) {
 556         is_udp = 1;
 557     } else {
 558         goto fail;
 559     }
 560
 561     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 562         goto fail;
 563     host_port = strtol(buf, &r, 0);
 564     if (r == buf)
 565         goto fail;
 566
 567     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
 568         goto fail;
 569     if (buf[0] == '\0') {
 570         pstrcpy(buf, sizeof(buf), "10.0.2.15");
 571     }
 572     if (!inet_aton(buf, &guest_addr))
 573         goto fail;
 574
 575     guest_port = strtol(p, &r, 0);
 576     if (r == p)
 577         goto fail;
 578
 579     if (slirp_redir(is_udp, host_port, guest_addr, guest_port) < 0) {
 580         fprintf(stderr, "qemu: could not set up redirection\n");
 581         exit(1);
 582     }
 583     return;
 584  fail:
 585     fprintf(stderr, "qemu: syntax: -redir [tcp|udp]:host-port:[guest-host]:guest-port\n");
 586     exit(1);
 587 }
 588
 589 #ifndef _WIN32
 590
 591 static char smb_dir[1024];
 592
 593 static void erase_dir(char *dir_name)
 594 {
 595     DIR *d;
 596     struct dirent *de;
 597     char filename[1024];
 598
 599     /* erase all the files in the directory */
 600     if ((d = opendir(dir_name)) != 0) {
 601         for(;;) {
 602             de = readdir(d);
 603             if (!de)
 604                 break;
 605             if (strcmp(de->d_name, ".") != 0 &&
 606                 strcmp(de->d_name, "..") != 0) {
 607                 snprintf(filename, sizeof(filename), "%s/%s",
 608                          smb_dir, de->d_name);
 609                 if (unlink(filename) != 0)  /* is it a directory? */
 610                     erase_dir(filename);
 611             }
 612         }
 613         closedir(d);
 614         rmdir(dir_name);
 615     }
 616 }
 617
 618 /* automatic user mode samba server configuration */
 619 static void smb_exit(void)
 620 {
 621     erase_dir(smb_dir);
 622 }
 623
 624 /* automatic user mode samba server configuration */
 625 void net_slirp_smb(const char *exported_dir)
 626 {
 627     char smb_conf[1024];
 628     char smb_cmdline[1024];
 629     FILE *f;
 630
 631     if (!slirp_inited) {
 632         slirp_inited = 1;
 633         slirp_init(slirp_restrict, slirp_ip);
 634     }
 635
 636     /* XXX: better tmp dir construction */
 637     snprintf(smb_dir, sizeof(smb_dir), "/tmp/qemu-smb.%d", getpid());
 638     if (mkdir(smb_dir, 0700) < 0) {
 639         fprintf(stderr, "qemu: could not create samba server dir '%s'\n", smb_dir);
 640         exit(1);
 641     }
 642     snprintf(smb_conf, sizeof(smb_conf), "%s/%s", smb_dir, "smb.conf");
 643
 644     f = fopen(smb_conf, "w");
 645     if (!f) {
 646         fprintf(stderr, "qemu: could not create samba server configuration file '%s'\n", smb_conf);
 647         exit(1);
 648     }
 649     fprintf(f,
 650             "[global]\n"
 651             "private dir=%s\n"
 652             "smb ports=0\n"
 653             "socket address=127.0.0.1\n"
 654             "pid directory=%s\n"
 655             "lock directory=%s\n"
 656             "log file=%s/log.smbd\n"
 657             "smb passwd file=%s/smbpasswd\n"
 658             "security = share\n"
 659             "[qemu]\n"
 660             "path=%s\n"
 661             "read only=no\n"
 662             "guest ok=yes\n",
 663             smb_dir,
 664             smb_dir,
 665             smb_dir,
 666             smb_dir,
 667             smb_dir,
 668             exported_dir
 669             );
 670     fclose(f);
 671     atexit(smb_exit);
 672
 673     snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s",
 674              SMBD_COMMAND, smb_conf);
 675
 676     slirp_add_exec(0, smb_cmdline, 4, 139);
 677 }
 678
 679 #endif /* !defined(_WIN32) */
 680 void do_info_slirp(void)
 681 {
 682     slirp_stats();
 683 }
 684
 685 struct VMChannel {
 686     CharDriverState *hd;
 687     int port;
 688 } *vmchannels;
 689
 690 static int vmchannel_can_read(void *opaque)
 691 {
 692     struct VMChannel *vmc = (struct VMChannel*)opaque;
 693     return slirp_socket_can_recv(4, vmc->port);
 694 }
 695
 696 static void vmchannel_read(void *opaque, const uint8_t *buf, int size)
 697 {
 698     struct VMChannel *vmc = (struct VMChannel*)opaque;
 699     slirp_socket_recv(4, vmc->port, buf, size);
 700 }
 701
 702 #endif /* CONFIG_SLIRP */
 703
 704 #ifdef _WIN32
 705
 706 int tap_has_vnet_hdr(void *opaque)
 707 {
 708     return 0;
 709 }
 710
 711 void tap_using_vnet_hdr(void *opaque, int using_vnet_hdr)
 712 {
 713 }
 714
 715 #else /* !defined(_WIN32) */
 716
 717 /* Maximum GSO packet size (64k) plus plenty of room for
 718  * the ethernet and virtio_net headers
 719  */
 720 #define TAP_BUFSIZE (4096 + 65536)
 721
 722 #ifdef IFF_VNET_HDR
 723 #include <linux/virtio_net.h>
 724 #endif
 725
 726 typedef struct TAPState {
 727     VLANClientState *vc;
 728     int fd;
 729     char down_script[1024];
 730     char down_script_arg[128];
 731     char buf[TAP_BUFSIZE];
 732     int size;
 733     unsigned int has_vnet_hdr : 1;
 734     unsigned int using_vnet_hdr : 1;
 735 } TAPState;
 736
 737 static int launch_script(const char *setup_script, const char *ifname, int fd);
 738
 739 static ssize_t tap_receive_iov(void *opaque, const struct iovec *iov,
 740                                int iovcnt)
 741 {
 742     TAPState *s = opaque;
 743     ssize_t len;
 744
 745     do {
 746         len = writev(s->fd, iov, iovcnt);
 747     } while (len == -1 && (errno == EINTR || errno == EAGAIN));
 748
 749     return len;
 750 }
 751
 752 static void tap_receive(void *opaque, const uint8_t *buf, int size)
 753 {
 754     struct iovec iov[2];
 755     int i = 0;
 756
 757 #ifdef IFF_VNET_HDR
 758     TAPState *s = opaque;
 759     struct virtio_net_hdr hdr = { 0, };
 760
 761     if (s->has_vnet_hdr && !s->using_vnet_hdr) {
 762         iov[i].iov_base = &hdr;
 763         iov[i].iov_len  = sizeof(hdr);
 764         i++;
 765     }
 766 #endif
 767
 768     iov[i].iov_base = (char *) buf;
 769     iov[i].iov_len  = size;
 770     i++;
 771
 772     tap_receive_iov(opaque, iov, i);
 773 }
 774
 775 static int tap_can_send(void *opaque)
 776 {
 777     TAPState *s = opaque;
 778     VLANClientState *vc;
 779     int can_receive = 0;
 780
 781     /* Check to see if any of our clients can receive a packet */
 782     for (vc = s->vc->vlan->first_client; vc; vc = vc->next) {
 783         /* Skip ourselves */
 784         if (vc == s->vc)
 785             continue;
 786
 787         if (!vc->fd_can_read) {
 788             /* no fd_can_read handler, they always can receive */
 789             can_receive = 1;
 790         } else
 791             can_receive = vc->fd_can_read(vc->opaque);
 792
 793         /* Once someone can receive, we try to send a packet */
 794         if (can_receive)
 795             break;
 796     }
 797
 798     return can_receive;
 799 }
 800
 801 static int tap_send_packet(TAPState *s)
 802 {
 803     uint8_t *buf = (uint8_t *)s->buf;
 804     int size = s->size;
 805
 806 #ifdef IFF_VNET_HDR
 807     if (s->has_vnet_hdr && !s->using_vnet_hdr) {
 808         buf += sizeof(struct virtio_net_hdr);
 809         size -= sizeof(struct virtio_net_hdr);
 810     }
 811 #endif
 812
 813     return qemu_send_packet(s->vc, buf, size);
 814 }
 815
 816 static void tap_send(void *opaque)
 817 {
 818     TAPState *s = opaque;
 819
 820     /* First try to send any buffered packet */
 821     if (s->size > 0) {
 822         int err;
 823
 824         /* If noone can receive the packet, buffer it */
 825         err = tap_send_packet(s);
 826         if (err == -EAGAIN)
 827             return;
 828     }
 829
 830     /* Read packets until we hit EAGAIN */
 831     do {
 832 #ifdef __sun__
 833         struct strbuf sbuf;
 834         int f = 0;
 835         sbuf.maxlen = sizeof(s->buf);
 836         sbuf.buf = s->buf;
 837         s->size = getmsg(s->fd, NULL, &sbuf, &f) >=0 ? sbuf.len : -1;
 838 #else
 839         // FIXME: kvm_sleep_begin();
 840         s->size = read(s->fd, s->buf, sizeof(s->buf));
 841         // FIXME: kvm_sleep_end();
 842 #endif
 843
 844         if (s->size == -1 && errno == EINTR)
 845             continue;
 846
 847         if (s->size > 0) {
 848             int err;
 849
 850             /* If noone can receive the packet, buffer it */
 851             err = tap_send_packet(s);
 852             if (err == -EAGAIN)
 853                 break;
 854         }
 855     } while (s->size > 0);
 856 }
 857
 858 int tap_has_vnet_hdr(void *opaque)
 859 {
 860     VLANClientState *vc = opaque;
 861     TAPState *s = vc->opaque;
 862
 863     return s ? s->has_vnet_hdr : 0;
 864 }
 865
 866 void tap_using_vnet_hdr(void *opaque, int using_vnet_hdr)
 867 {
 868     VLANClientState *vc = opaque;
 869     TAPState *s = vc->opaque;
 870
 871     if (!s || !s->has_vnet_hdr)
 872         return;
 873
 874     s->using_vnet_hdr = using_vnet_hdr != 0;
 875 }
 876
 877 static int tap_probe_vnet_hdr(int fd)
 878 {
 879 #if defined(TUNGETIFF) && defined(IFF_VNET_HDR)
 880     struct ifreq ifr;
 881
 882     if (ioctl(fd, TUNGETIFF, &ifr) != 0) {
 883         fprintf(stderr, "TUNGETIFF ioctl() failed: %s\n", strerror(errno));
 884         return 0;
 885     }
 886
 887     return ifr.ifr_flags & IFF_VNET_HDR;
 888 #else
 889     return 0;
 890 #endif
 891 }
 892
 893 #ifdef TUNSETOFFLOAD
 894 static void tap_set_offload(VLANClientState *vc, int csum, int tso4, int tso6,
 895                             int ecn)
 896 {
 897     TAPState *s = vc->opaque;
 898     unsigned int offload = 0;
 899
 900     if (csum) {
 901         offload |= TUN_F_CSUM;
 902         if (tso4)
 903             offload |= TUN_F_TSO4;
 904         if (tso6)
 905             offload |= TUN_F_TSO6;
 906         if ((tso4 || tso6) && ecn)
 907             offload |= TUN_F_TSO_ECN;
 908     }
 909
 910     if (ioctl(s->fd, TUNSETOFFLOAD, offload) != 0)
 911         fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n",
 912                 strerror(errno));
 913 }
 914 #endif /* TUNSETOFFLOAD */
 915
 916 static void tap_cleanup(VLANClientState *vc)
 917 {
 918     TAPState *s = vc->opaque;
 919
 920     if (s->down_script[0])
 921         launch_script(s->down_script, s->down_script_arg, s->fd);
 922
 923     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 924     close(s->fd);
 925     qemu_free(s);
 926 }
 927
 928 /* fd support */
 929
 930 static TAPState *net_tap_fd_init(VLANState *vlan,
 931                                  const char *model,
 932                                  const char *name,
 933                                  int fd,
 934                                  int vnet_hdr)
 935 {
 936     TAPState *s;
 937
 938     s = qemu_mallocz(sizeof(TAPState));
 939     s->fd = fd;
 940     s->has_vnet_hdr = vnet_hdr != 0;
 941     s->vc = qemu_new_vlan_client(vlan, model, name, tap_receive,
 942                                  NULL, tap_cleanup, s);
 943 #ifdef HAVE_IOVEC
 944     s->vc->fd_readv = tap_receive_iov;
 945 #endif
 946 #ifdef TUNSETOFFLOAD
 947     s->vc->set_offload = tap_set_offload;
 948 #endif
 949     qemu_set_fd_handler2(s->fd, tap_can_send, tap_send, NULL, s);
 950     snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd);
 951     return s;
 952 }
 953
 954 #if defined (_BSD) || defined (__FreeBSD_kernel__)
 955 static int tap_open(char *ifname, int ifname_size)
 956 {
 957     int fd;
 958     char *dev;
 959     struct stat s;
 960
 961     TFR(fd = open("/dev/tap", O_RDWR));
 962     if (fd < 0) {
 963         fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n");
 964         return -1;
 965     }
 966
 967     fstat(fd, &s);
 968     dev = devname(s.st_rdev, S_IFCHR);
 969     pstrcpy(ifname, ifname_size, dev);
 970
 971     fcntl(fd, F_SETFL, O_NONBLOCK);
 972     return fd;
 973 }
 974 #elif defined(__sun__)
 975 #define TUNNEWPPA       (('T'<<16) | 0x0001)
 976 /*
 977  * Allocate TAP device, returns opened fd.
 978  * Stores dev name in the first arg(must be large enough).
 979  */
 980 int tap_alloc(char *dev, size_t dev_size)
 981 {
 982     int tap_fd, if_fd, ppa = -1;
 983     static int ip_fd = 0;
 984     char *ptr;
 985
 986     static int arp_fd = 0;
 987     int ip_muxid, arp_muxid;
 988     struct strioctl  strioc_if, strioc_ppa;
 989     int link_type = I_PLINK;;
 990     struct lifreq ifr;
 991     char actual_name[32] = "";
 992
 993     memset(&ifr, 0x0, sizeof(ifr));
 994
 995     if( *dev ){
 996        ptr = dev;
 997        while( *ptr && !qemu_isdigit((int)*ptr) ) ptr++;
 998        ppa = atoi(ptr);
 999     }
1000
1001     /* Check if IP device was opened */
1002     if( ip_fd )
1003        close(ip_fd);
1004
1005     TFR(ip_fd = open("/dev/udp", O_RDWR, 0));
1006     if (ip_fd < 0) {
1007        syslog(LOG_ERR, "Can't open /dev/ip (actually /dev/udp)");
1008        return -1;
1009     }
1010
1011     TFR(tap_fd = open("/dev/tap", O_RDWR, 0));
1012     if (tap_fd < 0) {
1013        syslog(LOG_ERR, "Can't open /dev/tap");
1014        return -1;
1015     }
1016
1017     /* Assign a new PPA and get its unit number. */
1018     strioc_ppa.ic_cmd = TUNNEWPPA;
1019     strioc_ppa.ic_timout = 0;
1020     strioc_ppa.ic_len = sizeof(ppa);
1021     strioc_ppa.ic_dp = (char *)&ppa;
1022     if ((ppa = ioctl (tap_fd, I_STR, &strioc_ppa)) < 0)
1023        syslog (LOG_ERR, "Can't assign new interface");
1024
1025     TFR(if_fd = open("/dev/tap", O_RDWR, 0));
1026     if (if_fd < 0) {
1027        syslog(LOG_ERR, "Can't open /dev/tap (2)");
1028        return -1;
1029     }
1030     if(ioctl(if_fd, I_PUSH, "ip") < 0){
1031        syslog(LOG_ERR, "Can't push IP module");
1032        return -1;
1033     }
1034
1035     if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0)
1036         syslog(LOG_ERR, "Can't get flags\n");
1037
1038     snprintf (actual_name, 32, "tap%d", ppa);
1039     pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name);
1040
1041     ifr.lifr_ppa = ppa;
1042     /* Assign ppa according to the unit number returned by tun device */
1043
1044     if (ioctl (if_fd, SIOCSLIFNAME, &ifr) < 0)
1045         syslog (LOG_ERR, "Can't set PPA %d", ppa);
1046     if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) <0)
1047         syslog (LOG_ERR, "Can't get flags\n");
1048     /* Push arp module to if_fd */
1049     if (ioctl (if_fd, I_PUSH, "arp") < 0)
1050         syslog (LOG_ERR, "Can't push ARP module (2)");
1051
1052     /* Push arp module to ip_fd */
1053     if (ioctl (ip_fd, I_POP, NULL) < 0)
1054         syslog (LOG_ERR, "I_POP failed\n");
1055     if (ioctl (ip_fd, I_PUSH, "arp") < 0)
1056         syslog (LOG_ERR, "Can't push ARP module (3)\n");
1057     /* Open arp_fd */
1058     TFR(arp_fd = open ("/dev/tap", O_RDWR, 0));
1059     if (arp_fd < 0)
1060        syslog (LOG_ERR, "Can't open %s\n", "/dev/tap");
1061
1062     /* Set ifname to arp */
1063     strioc_if.ic_cmd = SIOCSLIFNAME;
1064     strioc_if.ic_timout = 0;
1065     strioc_if.ic_len = sizeof(ifr);
1066     strioc_if.ic_dp = (char *)&ifr;
1067     if (ioctl(arp_fd, I_STR, &strioc_if) < 0){
1068         syslog (LOG_ERR, "Can't set ifname to arp\n");
1069     }
1070
1071     if((ip_muxid = ioctl(ip_fd, I_LINK, if_fd)) < 0){
1072        syslog(LOG_ERR, "Can't link TAP device to IP");
1073        return -1;
1074     }
1075
1076     if ((arp_muxid = ioctl (ip_fd, link_type, arp_fd)) < 0)
1077         syslog (LOG_ERR, "Can't link TAP device to ARP");
1078
1079     close (if_fd);
1080
1081     memset(&ifr, 0x0, sizeof(ifr));
1082     pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name);
1083     ifr.lifr_ip_muxid  = ip_muxid;
1084     ifr.lifr_arp_muxid = arp_muxid;
1085
1086     if (ioctl (ip_fd, SIOCSLIFMUXID, &ifr) < 0)
1087     {
1088       ioctl (ip_fd, I_PUNLINK , arp_muxid);
1089       ioctl (ip_fd, I_PUNLINK, ip_muxid);
1090       syslog (LOG_ERR, "Can't set multiplexor id");
1091     }
1092
1093     snprintf(dev, dev_size, "tap%d", ppa);
1094     return tap_fd;
1095 }
1096
1097 static int tap_open(char *ifname, int ifname_size, int *vnet_hdr)
1098 {
1099     char  dev[10]="";
1100     int fd;
1101     if( (fd = tap_alloc(dev, sizeof(dev))) < 0 ){
1102        fprintf(stderr, "Cannot allocate TAP device\n");
1103        return -1;
1104     }
1105     pstrcpy(ifname, ifname_size, dev);
1106     fcntl(fd, F_SETFL, O_NONBLOCK);
1107     return fd;
1108 }
1109 #elif defined (_AIX)
1110 static int tap_open(char *ifname, int ifname_size)
1111 {
1112     fprintf (stderr, "no tap on AIX\n");
1113     return -1;
1114 }
1115 #else
1116 static int tap_open(char *ifname, int ifname_size, int *vnet_hdr)
1117 {
1118     struct ifreq ifr;
1119     int fd, ret;
1120
1121     TFR(fd = open("/dev/net/tun", O_RDWR));
1122     if (fd < 0) {
1123         fprintf(stderr, "warning: could not open /dev/net/tun: no virtual network emulation\n");
1124         return -1;
1125     }
1126     memset(&ifr, 0, sizeof(ifr));
1127     ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
1128
1129 #if defined(TUNGETFEATURES) && defined(IFF_VNET_HDR)
1130     {
1131         unsigned int features;
1132
1133         if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
1134             features & IFF_VNET_HDR) {
1135             *vnet_hdr = 1;
1136             ifr.ifr_flags |= IFF_VNET_HDR;
1137         }
1138     }
1139 #endif
1140
1141     if (ifname[0] != '\0')
1142         pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname);
1143     else
1144         pstrcpy(ifr.ifr_name, IFNAMSIZ, "tap%d");
1145     ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
1146     if (ret != 0) {
1147         fprintf(stderr, "warning: could not configure /dev/net/tun: no virtual network emulation\n");
1148         close(fd);
1149         return -1;
1150     }
1151     pstrcpy(ifname, ifname_size, ifr.ifr_name);
1152     fcntl(fd, F_SETFL, O_NONBLOCK);
1153     return fd;
1154 }
1155 #endif
1156
1157 static int launch_script(const char *setup_script, const char *ifname, int fd)
1158 {
1159     int pid, status;
1160     char *args[3];
1161     char **parg;
1162
1163         /* try to launch network script */
1164         pid = fork();
1165         if (pid >= 0) {
1166             if (pid == 0) {
1167                 int open_max = sysconf (_SC_OPEN_MAX), i;
1168                 for (i = 0; i < open_max; i++)
1169                     if (i != STDIN_FILENO &&
1170                         i != STDOUT_FILENO &&
1171                         i != STDERR_FILENO &&
1172                         i != fd)
1173                         close(i);
1174
1175                 parg = args;
1176                 *parg++ = (char *)setup_script;
1177                 *parg++ = (char *)ifname;
1178                 *parg++ = NULL;
1179                 execv(setup_script, args);
1180                 _exit(1);
1181             }
1182             while (waitpid(pid, &status, 0) != pid);
1183             if (!WIFEXITED(status) ||
1184                 WEXITSTATUS(status) != 0) {
1185                 fprintf(stderr, "%s: could not launch network script\n",
1186                         setup_script);
1187                 return -1;
1188             }
1189         }
1190     return 0;
1191 }
1192
1193 static int net_tap_init(VLANState *vlan, const char *model,
1194                         const char *name, const char *ifname1,
1195                         const char *setup_script, const char *down_script)
1196 {
1197     TAPState *s;
1198     int fd;
1199     int vnet_hdr;
1200     char ifname[128];
1201
1202     if (ifname1 != NULL)
1203         pstrcpy(ifname, sizeof(ifname), ifname1);
1204     else
1205         ifname[0] = '\0';
1206     vnet_hdr = 0;
1207     TFR(fd = tap_open(ifname, sizeof(ifname), &vnet_hdr));
1208     if (fd < 0)
1209         return -1;
1210
1211     if (!setup_script || !strcmp(setup_script, "no"))
1212         setup_script = "";
1213     if (setup_script[0] != '\0') {
1214         if (launch_script(setup_script, ifname, fd))
1215             return -1;
1216     }
1217     s = net_tap_fd_init(vlan, model, name, fd, vnet_hdr);
1218     if (!s)
1219         return -1;
1220
1221     snprintf(s->vc->info_str, sizeof(s->vc->info_str),
1222              "ifname=%s,script=%s,downscript=%s",
1223              ifname, setup_script, down_script);
1224     if (down_script && strcmp(down_script, "no")) {
1225         snprintf(s->down_script, sizeof(s->down_script), "%s", down_script);
1226         snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname);
1227     }
1228     return 0;
1229 }
1230
1231 #endif /* !_WIN32 */
1232
1233 #if defined(CONFIG_VDE)
1234 typedef struct VDEState {
1235     VLANClientState *vc;
1236     VDECONN *vde;
1237 } VDEState;
1238
1239 static void vde_to_qemu(void *opaque)
1240 {
1241     VDEState *s = opaque;
1242     uint8_t buf[4096];
1243     int size;
1244
1245     size = vde_recv(s->vde, buf, sizeof(buf), 0);
1246     if (size > 0) {
1247         qemu_send_packet(s->vc, buf, size);
1248     }
1249 }
1250
1251 static void vde_from_qemu(void *opaque, const uint8_t *buf, int size)
1252 {
1253     VDEState *s = opaque;
1254     int ret;
1255     for(;;) {
1256         ret = vde_send(s->vde, buf, size, 0);
1257         if (ret < 0 && errno == EINTR) {
1258         } else {
1259             break;
1260         }
1261     }
1262 }
1263
1264 static void vde_cleanup(VLANClientState *vc)
1265 {
1266     VDEState *s = vc->opaque;
1267     qemu_set_fd_handler(vde_datafd(s->vde), NULL, NULL, NULL);
1268     vde_close(s->vde);
1269     qemu_free(s);
1270 }
1271
1272 static int net_vde_init(VLANState *vlan, const char *model,
1273                         const char *name, const char *sock,
1274                         int port, const char *group, int mode)
1275 {
1276     VDEState *s;
1277     char *init_group = strlen(group) ? (char *)group : NULL;
1278     char *init_sock = strlen(sock) ? (char *)sock : NULL;
1279
1280     struct vde_open_args args = {
1281         .port = port,
1282         .group = init_group,
1283         .mode = mode,
1284     };
1285
1286     s = qemu_mallocz(sizeof(VDEState));
1287     s->vde = vde_open(init_sock, "QEMU", &args);
1288     if (!s->vde){
1289         free(s);
1290         return -1;
1291     }
1292     s->vc = qemu_new_vlan_client(vlan, model, name, vde_from_qemu,
1293                                  NULL, vde_cleanup, s);
1294     qemu_set_fd_handler(vde_datafd(s->vde), vde_to_qemu, NULL, s);
1295     snprintf(s->vc->info_str, sizeof(s->vc->info_str), "sock=%s,fd=%d",
1296              sock, vde_datafd(s->vde));
1297     return 0;
1298 }
1299 #endif
1300
1301 /* network connection */
1302 typedef struct NetSocketState {
1303     VLANClientState *vc;
1304     int fd;
1305     int state; /* 0 = getting length, 1 = getting data */
1306     unsigned int index;
1307     unsigned int packet_len;
1308     uint8_t buf[4096];
1309     struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
1310 } NetSocketState;
1311
1312 typedef struct NetSocketListenState {
1313     VLANState *vlan;
1314     char *model;
1315     char *name;
1316     int fd;
1317 } NetSocketListenState;
1318
1319 /* XXX: we consider we can send the whole packet without blocking */
1320 static void net_socket_receive(void *opaque, const uint8_t *buf, int size)
1321 {
1322     NetSocketState *s = opaque;
1323     uint32_t len;
1324     len = htonl(size);
1325
1326     send_all(s->fd, (const uint8_t *)&len, sizeof(len));
1327     send_all(s->fd, buf, size);
1328 }
1329
1330 static void net_socket_receive_dgram(void *opaque, const uint8_t *buf, int size)
1331 {
1332     NetSocketState *s = opaque;
1333     sendto(s->fd, buf, size, 0,
1334            (struct sockaddr *)&s->dgram_dst, sizeof(s->dgram_dst));
1335 }
1336
1337 static void net_socket_send(void *opaque)
1338 {
1339     NetSocketState *s = opaque;
1340     int size, err;
1341     unsigned l;
1342     uint8_t buf1[4096];
1343     const uint8_t *buf;
1344
1345     size = recv(s->fd, buf1, sizeof(buf1), 0);
1346     if (size < 0) {
1347         err = socket_error();
1348         if (err != EWOULDBLOCK)
1349             goto eoc;
1350     } else if (size == 0) {
1351         /* end of connection */
1352     eoc:
1353         qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
1354         closesocket(s->fd);
1355         return;
1356     }
1357     buf = buf1;
1358     while (size > 0) {
1359         /* reassemble a packet from the network */
1360         switch(s->state) {
1361         case 0:
1362             l = 4 - s->index;
1363             if (l > size)
1364                 l = size;
1365             memcpy(s->buf + s->index, buf, l);
1366             buf += l;
1367             size -= l;
1368             s->index += l;
1369             if (s->index == 4) {
1370                 /* got length */
1371                 s->packet_len = ntohl(*(uint32_t *)s->buf);
1372                 s->index = 0;
1373                 s->state = 1;
1374             }
1375             break;
1376         case 1:
1377             l = s->packet_len - s->index;
1378             if (l > size)
1379                 l = size;
1380             if (s->index + l <= sizeof(s->buf)) {
1381                 memcpy(s->buf + s->index, buf, l);
1382             } else {
1383                 fprintf(stderr, "serious error: oversized packet received,"
1384                     "connection terminated.\n");
1385                 s->state = 0;
1386                 goto eoc;
1387             }
1388
1389             s->index += l;
1390             buf += l;
1391             size -= l;
1392             if (s->index >= s->packet_len) {
1393                 qemu_send_packet(s->vc, s->buf, s->packet_len);
1394                 s->index = 0;
1395                 s->state = 0;
1396             }
1397             break;
1398         }
1399     }
1400 }
1401
1402 static void net_socket_send_dgram(void *opaque)
1403 {
1404     NetSocketState *s = opaque;
1405     int size;
1406
1407     size = recv(s->fd, s->buf, sizeof(s->buf), 0);
1408     if (size < 0)
1409         return;
1410     if (size == 0) {
1411         /* end of connection */
1412         qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
1413         return;
1414     }
1415     qemu_send_packet(s->vc, s->buf, size);
1416 }
1417
1418 static int net_socket_mcast_create(struct sockaddr_in *mcastaddr)
1419 {
1420     struct ip_mreq imr;
1421     int fd;
1422     int val, ret;
1423     if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
1424         fprintf(stderr, "qemu: error: specified mcastaddr \"%s\" (0x%08x) does not contain a multicast address\n",
1425                 inet_ntoa(mcastaddr->sin_addr),
1426                 (int)ntohl(mcastaddr->sin_addr.s_addr));
1427         return -1;
1428
1429     }
1430     fd = socket(PF_INET, SOCK_DGRAM, 0);
1431     if (fd < 0) {
1432         perror("socket(PF_INET, SOCK_DGRAM)");
1433         return -1;
1434     }
1435
1436     val = 1;
1437     ret=setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
1438                    (const char *)&val, sizeof(val));
1439     if (ret < 0) {
1440         perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
1441         goto fail;
1442     }
1443
1444     ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
1445     if (ret < 0) {
1446         perror("bind");
1447         goto fail;
1448     }
1449
1450     /* Add host to multicast group */
1451     imr.imr_multiaddr = mcastaddr->sin_addr;
1452     imr.imr_interface.s_addr = htonl(INADDR_ANY);
1453
1454     ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1455                      (const char *)&imr, sizeof(struct ip_mreq));
1456     if (ret < 0) {
1457         perror("setsockopt(IP_ADD_MEMBERSHIP)");
1458         goto fail;
1459     }
1460
1461     /* Force mcast msgs to loopback (eg. several QEMUs in same host */
1462     val = 1;
1463     ret=setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1464                    (const char *)&val, sizeof(val));
1465     if (ret < 0) {
1466         perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
1467         goto fail;
1468     }
1469
1470     socket_set_nonblock(fd);
1471     return fd;
1472 fail:
1473     if (fd >= 0)
1474         closesocket(fd);
1475     return -1;
1476 }
1477
1478 static void net_socket_cleanup(VLANClientState *vc)
1479 {
1480     NetSocketState *s = vc->opaque;
1481     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
1482     close(s->fd);
1483     qemu_free(s);
1484 }
1485
1486 static NetSocketState *net_socket_fd_init_dgram(VLANState *vlan,
1487                                                 const char *model,
1488                                                 const char *name,
1489                                                 int fd, int is_connected)
1490 {
1491     struct sockaddr_in saddr;
1492     int newfd;
1493     socklen_t saddr_len;
1494     NetSocketState *s;
1495
1496     /* fd passed: multicast: "learn" dgram_dst address from bound address and save it
1497      * Because this may be "shared" socket from a "master" process, datagrams would be recv()
1498      * by ONLY ONE process: we must "clone" this dgram socket --jjo
1499      */
1500
1501     if (is_connected) {
1502         if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
1503             /* must be bound */
1504             if (saddr.sin_addr.s_addr==0) {
1505                 fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, cannot setup multicast dst addr\n",
1506                         fd);
1507                 return NULL;
1508             }
1509             /* clone dgram socket */
1510             newfd = net_socket_mcast_create(&saddr);
1511             if (newfd < 0) {
1512                 /* error already reported by net_socket_mcast_create() */
1513                 close(fd);
1514                 return NULL;
1515             }
1516             /* clone newfd to fd, close newfd */
1517             dup2(newfd, fd);
1518             close(newfd);
1519
1520         } else {
1521             fprintf(stderr, "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
1522                     fd, strerror(errno));
1523             return NULL;
1524         }
1525     }
1526
1527     s = qemu_mallocz(sizeof(NetSocketState));
1528     s->fd = fd;
1529
1530     s->vc = qemu_new_vlan_client(vlan, model, name, net_socket_receive_dgram,
1531                                  NULL, net_socket_cleanup, s);
1532     qemu_set_fd_handler(s->fd, net_socket_send_dgram, NULL, s);
1533
1534     /* mcast: save bound address as dst */
1535     if (is_connected) s->dgram_dst=saddr;
1536
1537     snprintf(s->vc->info_str, sizeof(s->vc->info_str),
1538             "socket: fd=%d (%s mcast=%s:%d)",
1539             fd, is_connected? "cloned" : "",
1540             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
1541     return s;
1542 }
1543
1544 static void net_socket_connect(void *opaque)
1545 {
1546     NetSocketState *s = opaque;
1547     qemu_set_fd_handler(s->fd, net_socket_send, NULL, s);
1548 }
1549
1550 static NetSocketState *net_socket_fd_init_stream(VLANState *vlan,
1551                                                  const char *model,
1552                                                  const char *name,
1553                                                  int fd, int is_connected)
1554 {
1555     NetSocketState *s;
1556     s = qemu_mallocz(sizeof(NetSocketState));
1557     s->fd = fd;
1558     s->vc = qemu_new_vlan_client(vlan, model, name, net_socket_receive,
1559                                  NULL, net_socket_cleanup, s);
1560     snprintf(s->vc->info_str, sizeof(s->vc->info_str),
1561              "socket: fd=%d", fd);
1562     if (is_connected) {
1563         net_socket_connect(s);
1564     } else {
1565         qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
1566     }
1567     return s;
1568 }
1569
1570 static NetSocketState *net_socket_fd_init(VLANState *vlan,
1571                                           const char *model, const char *name,
1572                                           int fd, int is_connected)
1573 {
1574     int so_type=-1, optlen=sizeof(so_type);
1575
1576     if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
1577         (socklen_t *)&optlen)< 0) {
1578         fprintf(stderr, "qemu: error: getsockopt(SO_TYPE) for fd=%d failed\n", fd);
1579         return NULL;
1580     }
1581     switch(so_type) {
1582     case SOCK_DGRAM:
1583         return net_socket_fd_init_dgram(vlan, model, name, fd, is_connected);
1584     case SOCK_STREAM:
1585         return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
1586     default:
1587         /* who knows ... this could be a eg. a pty, do warn and continue as stream */
1588         fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
1589         return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
1590     }
1591     return NULL;
1592 }
1593
1594 static void net_socket_accept(void *opaque)
1595 {
1596     NetSocketListenState *s = opaque;
1597     NetSocketState *s1;
1598     struct sockaddr_in saddr;
1599     socklen_t len;
1600     int fd;
1601
1602     for(;;) {
1603         len = sizeof(saddr);
1604         fd = accept(s->fd, (struct sockaddr *)&saddr, &len);
1605         if (fd < 0 && errno != EINTR) {
1606             return;
1607         } else if (fd >= 0) {
1608             break;
1609         }
1610     }
1611     s1 = net_socket_fd_init(s->vlan, s->model, s->name, fd, 1);
1612     if (!s1) {
1613         closesocket(fd);
1614     } else {
1615         snprintf(s1->vc->info_str, sizeof(s1->vc->info_str),
1616                  "socket: connection from %s:%d",
1617                  inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
1618     }
1619 }
1620
1621 static int net_socket_listen_init(VLANState *vlan,
1622                                   const char *model,
1623                                   const char *name,
1624                                   const char *host_str)
1625 {
1626     NetSocketListenState *s;
1627     int fd, val, ret;
1628     struct sockaddr_in saddr;
1629
1630     if (parse_host_port(&saddr, host_str) < 0)
1631         return -1;
1632
1633     s = qemu_mallocz(sizeof(NetSocketListenState));
1634
1635     fd = socket(PF_INET, SOCK_STREAM, 0);
1636     if (fd < 0) {
1637         perror("socket");
1638         return -1;
1639     }
1640     socket_set_nonblock(fd);
1641
1642     /* allow fast reuse */
1643     val = 1;
1644     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
1645
1646     ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
1647     if (ret < 0) {
1648         perror("bind");
1649         return -1;
1650     }
1651     ret = listen(fd, 0);
1652     if (ret < 0) {
1653         perror("listen");
1654         return -1;
1655     }
1656     s->vlan = vlan;
1657     s->model = strdup(model);
1658     s->name = strdup(name);
1659     s->fd = fd;
1660     qemu_set_fd_handler(fd, net_socket_accept, NULL, s);
1661     return 0;
1662 }
1663
1664 static int net_socket_connect_init(VLANState *vlan,
1665                                    const char *model,
1666                                    const char *name,
1667                                    const char *host_str)
1668 {
1669     NetSocketState *s;
1670     int fd, connected, ret, err;
1671     struct sockaddr_in saddr;
1672
1673     if (parse_host_port(&saddr, host_str) < 0)
1674         return -1;
1675
1676     fd = socket(PF_INET, SOCK_STREAM, 0);
1677     if (fd < 0) {
1678         perror("socket");
1679         return -1;
1680     }
1681     socket_set_nonblock(fd);
1682
1683     connected = 0;
1684     for(;;) {
1685         ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
1686         if (ret < 0) {
1687             err = socket_error();
1688             if (err == EINTR || err == EWOULDBLOCK) {
1689             } else if (err == EINPROGRESS) {
1690                 break;
1691 #ifdef _WIN32
1692             } else if (err == WSAEALREADY) {
1693                 break;
1694 #endif
1695             } else {
1696                 perror("connect");
1697                 closesocket(fd);
1698                 return -1;
1699             }
1700         } else {
1701             connected = 1;
1702             break;
1703         }
1704     }
1705     s = net_socket_fd_init(vlan, model, name, fd, connected);
1706     if (!s)
1707         return -1;
1708     snprintf(s->vc->info_str, sizeof(s->vc->info_str),
1709              "socket: connect to %s:%d",
1710              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
1711     return 0;
1712 }
1713
1714 static int net_socket_mcast_init(VLANState *vlan,
1715                                  const char *model,
1716                                  const char *name,
1717                                  const char *host_str)
1718 {
1719     NetSocketState *s;
1720     int fd;
1721     struct sockaddr_in saddr;
1722
1723     if (parse_host_port(&saddr, host_str) < 0)
1724         return -1;
1725
1726
1727     fd = net_socket_mcast_create(&saddr);
1728     if (fd < 0)
1729         return -1;
1730
1731     s = net_socket_fd_init(vlan, model, name, fd, 0);
1732     if (!s)
1733         return -1;
1734
1735     s->dgram_dst = saddr;
1736
1737     snprintf(s->vc->info_str, sizeof(s->vc->info_str),
1738              "socket: mcast=%s:%d",
1739              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
1740     return 0;
1741
1742 }
1743
1744 /* find or alloc a new VLAN */
1745 VLANState *qemu_find_vlan(int id)
1746 {
1747     VLANState **pvlan, *vlan;
1748     for(vlan = first_vlan; vlan != NULL; vlan = vlan->next) {
1749         if (vlan->id == id)
1750             return vlan;
1751     }
1752     vlan = qemu_mallocz(sizeof(VLANState));
1753     vlan->id = id;
1754     vlan->next = NULL;
1755     pvlan = &first_vlan;
1756     while (*pvlan != NULL)
1757         pvlan = &(*pvlan)->next;
1758     *pvlan = vlan;
1759     return vlan;
1760 }
1761
1762 static int nic_get_free_idx(void)
1763 {
1764     int index;
1765
1766     for (index = 0; index < MAX_NICS; index++)
1767         if (!nd_table[index].used)
1768             return index;
1769     return -1;
1770 }
1771
1772 void qemu_check_nic_model(NICInfo *nd, const char *model)
1773 {
1774     const char *models[2];
1775
1776     models[0] = model;
1777     models[1] = NULL;
1778
1779     qemu_check_nic_model_list(nd, models, model);
1780 }
1781
1782 void qemu_check_nic_model_list(NICInfo *nd, const char * const *models,
1783                                const char *default_model)
1784 {
1785     int i, exit_status = 0;
1786
1787     if (!nd->model)
1788         nd->model = strdup(default_model);
1789
1790     if (strcmp(nd->model, "?") != 0) {
1791         for (i = 0 ; models[i]; i++)
1792             if (strcmp(nd->model, models[i]) == 0)
1793                 return;
1794
1795         fprintf(stderr, "qemu: Unsupported NIC model: %s\n", nd->model);
1796         exit_status = 1;
1797     }
1798
1799     fprintf(stderr, "qemu: Supported NIC models: ");
1800     for (i = 0 ; models[i]; i++)
1801         fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
1802
1803     exit(exit_status);
1804 }
1805
1806 int net_client_init(const char *device, const char *p)
1807 {
1808     char buf[1024];
1809     int vlan_id, ret;
1810     VLANState *vlan;
1811     char *name = NULL;
1812
1813     vlan_id = 0;
1814     if (get_param_value(buf, sizeof(buf), "vlan", p)) {
1815         vlan_id = strtol(buf, NULL, 0);
1816     }
1817     vlan = qemu_find_vlan(vlan_id);
1818
1819     if (get_param_value(buf, sizeof(buf), "name", p)) {
1820         name = strdup(buf);
1821     }
1822     if (!strcmp(device, "nic")) {
1823         NICInfo *nd;
1824         uint8_t *macaddr;
1825         int idx = nic_get_free_idx();
1826
1827         if (idx == -1 || nb_nics >= MAX_NICS) {
1828             fprintf(stderr, "Too Many NICs\n");
1829             ret = -1;
1830             goto out;
1831         }
1832         nd = &nd_table[idx];
1833         macaddr = nd->macaddr;
1834         macaddr[0] = 0x52;
1835         macaddr[1] = 0x54;
1836         macaddr[2] = 0x00;
1837         macaddr[3] = 0x12;
1838         macaddr[4] = 0x34;
1839         macaddr[5] = 0x56 + idx;
1840
1841         if (get_param_value(buf, sizeof(buf), "macaddr", p)) {
1842             if (parse_macaddr(macaddr, buf) < 0) {
1843                 fprintf(stderr, "invalid syntax for ethernet address\n");
1844                 ret = -1;
1845                 goto out;
1846             }
1847         }
1848         if (get_param_value(buf, sizeof(buf), "model", p)) {
1849             nd->model = strdup(buf);
1850         }
1851         nd->vlan = vlan;
1852         nd->name = name;
1853         nd->used = 1;
1854         name = NULL;
1855         nb_nics++;
1856         vlan->nb_guest_devs++;
1857         ret = idx;
1858     } else
1859     if (!strcmp(device, "none")) {
1860         /* does nothing. It is needed to signal that no network cards
1861            are wanted */
1862         ret = 0;
1863     } else
1864 #ifdef CONFIG_SLIRP
1865     if (!strcmp(device, "user")) {
1866         if (get_param_value(buf, sizeof(buf), "hostname", p)) {
1867             pstrcpy(slirp_hostname, sizeof(slirp_hostname), buf);
1868         }
1869         if (get_param_value(buf, sizeof(buf), "restrict", p)) {
1870             slirp_restrict = (buf[0] == 'y') ? 1 : 0;
1871         }
1872         if (get_param_value(buf, sizeof(buf), "ip", p)) {
1873             slirp_ip = strdup(buf);
1874         }
1875         vlan->nb_host_devs++;
1876         ret = net_slirp_init(vlan, device, name);
1877     } else if (!strcmp(device, "channel")) {
1878         long port;
1879         char name[20], *devname;
1880         struct VMChannel *vmc;
1881
1882         port = strtol(p, &devname, 10);
1883         devname++;
1884         if (port < 1 || port > 65535) {
1885             fprintf(stderr, "vmchannel wrong port number\n");
1886             ret = -1;
1887             goto out;
1888         }
1889         vmc = malloc(sizeof(struct VMChannel));
1890         snprintf(name, 20, "vmchannel%ld", port);
1891         vmc->hd = qemu_chr_open(name, devname, NULL);
1892         if (!vmc->hd) {
1893             fprintf(stderr, "qemu: could not open vmchannel device"
1894                     "'%s'\n", devname);
1895             ret = -1;
1896             goto out;
1897         }
1898         vmc->port = port;
1899         slirp_add_exec(3, vmc->hd, 4, port);
1900         qemu_chr_add_handlers(vmc->hd, vmchannel_can_read, vmchannel_read,
1901                 NULL, vmc);
1902         ret = 0;
1903     } else
1904 #endif
1905 #ifdef _WIN32
1906     if (!strcmp(device, "tap")) {
1907         char ifname[64];
1908         if (get_param_value(ifname, sizeof(ifname), "ifname", p) <= 0) {
1909             fprintf(stderr, "tap: no interface name\n");
1910             ret = -1;
1911             goto out;
1912         }
1913         vlan->nb_host_devs++;
1914         ret = tap_win32_init(vlan, device, name, ifname);
1915     } else
1916 #elif defined (_AIX)
1917 #else
1918     if (!strcmp(device, "tap")) {
1919         char ifname[64];
1920         char setup_script[1024], down_script[1024];
1921         int fd;
1922         vlan->nb_host_devs++;
1923         if (get_param_value(buf, sizeof(buf), "fd", p) > 0) {
1924             fd = strtol(buf, NULL, 0);
1925             fcntl(fd, F_SETFL, O_NONBLOCK);
1926             ret = -1;
1927                 if (net_tap_fd_init(vlan, device, name, fd,
1928                                     tap_probe_vnet_hdr(fd)))
1929                 ret = 0;
1930         } else {
1931             if (get_param_value(ifname, sizeof(ifname), "ifname", p) <= 0) {
1932                 ifname[0] = '\0';
1933             }
1934             if (get_param_value(setup_script, sizeof(setup_script), "script", p) == 0) {
1935                 pstrcpy(setup_script, sizeof(setup_script), DEFAULT_NETWORK_SCRIPT);
1936             }
1937             if (get_param_value(down_script, sizeof(down_script), "downscript", p) == 0) {
1938                 pstrcpy(down_script, sizeof(down_script), DEFAULT_NETWORK_DOWN_SCRIPT);
1939             }
1940             ret = net_tap_init(vlan, device, name, ifname, setup_script, down_script);
1941         }
1942     } else
1943 #endif
1944     if (!strcmp(device, "socket")) {
1945         if (get_param_value(buf, sizeof(buf), "fd", p) > 0) {
1946             int fd;
1947             fd = strtol(buf, NULL, 0);
1948             ret = -1;
1949             if (net_socket_fd_init(vlan, device, name, fd, 1))
1950                 ret = 0;
1951         } else if (get_param_value(buf, sizeof(buf), "listen", p) > 0) {
1952             ret = net_socket_listen_init(vlan, device, name, buf);
1953         } else if (get_param_value(buf, sizeof(buf), "connect", p) > 0) {
1954             ret = net_socket_connect_init(vlan, device, name, buf);
1955         } else if (get_param_value(buf, sizeof(buf), "mcast", p) > 0) {
1956             ret = net_socket_mcast_init(vlan, device, name, buf);
1957         } else {
1958             fprintf(stderr, "Unknown socket options: %s\n", p);
1959             ret = -1;
1960             goto out;
1961         }
1962         vlan->nb_host_devs++;
1963     } else
1964 #ifdef CONFIG_VDE
1965     if (!strcmp(device, "vde")) {
1966         char vde_sock[1024], vde_group[512];
1967         int vde_port, vde_mode;
1968         vlan->nb_host_devs++;
1969         if (get_param_value(vde_sock, sizeof(vde_sock), "sock", p) <= 0) {
1970             vde_sock[0] = '\0';
1971         }
1972         if (get_param_value(buf, sizeof(buf), "port", p) > 0) {
1973             vde_port = strtol(buf, NULL, 10);
1974         } else {
1975             vde_port = 0;
1976         }
1977         if (get_param_value(vde_group, sizeof(vde_group), "group", p) <= 0) {
1978             vde_group[0] = '\0';
1979         }
1980         if (get_param_value(buf, sizeof(buf), "mode", p) > 0) {
1981             vde_mode = strtol(buf, NULL, 8);
1982         } else {
1983             vde_mode = 0700;
1984         }
1985         ret = net_vde_init(vlan, device, name, vde_sock, vde_port, vde_group, vde_mode);
1986     } else
1987 #endif
1988     {
1989         fprintf(stderr, "Unknown network device: %s\n", device);
1990         ret = -1;
1991         goto out;
1992     }
1993     if (ret < 0) {
1994         fprintf(stderr, "Could not initialize device '%s'\n", device);
1995     }
1996 out:
1997     if (name)
1998         free(name);
1999     return ret;
2000 }
2001
2002 void net_client_uninit(NICInfo *nd)
2003 {
2004     nd->vlan->nb_guest_devs--;
2005     nb_nics--;
2006     nd->used = 0;
2007     free((void *)nd->model);
2008 }
2009
2010 static int net_host_check_device(const char *device)
2011 {
2012     int i;
2013     const char *valid_param_list[] = { "tap", "socket"
2014 #ifdef CONFIG_SLIRP
2015                                        ,"user"
2016 #endif
2017 #ifdef CONFIG_VDE
2018                                        ,"vde"
2019 #endif
2020     };
2021     for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
2022         if (!strncmp(valid_param_list[i], device,
2023                      strlen(valid_param_list[i])))
2024             return 1;
2025     }
2026
2027     return 0;
2028 }
2029
2030 void net_host_device_add(const char *device, const char *opts)
2031 {
2032     if (!net_host_check_device(device)) {
2033         term_printf("invalid host network device %s\n", device);
2034         return;
2035     }
2036     net_client_init(device, opts);
2037 }
2038
2039 void net_host_device_remove(int vlan_id, const char *device)
2040 {
2041     VLANState *vlan;
2042     VLANClientState *vc;
2043
2044     vlan = qemu_find_vlan(vlan_id);
2045
2046    for(vc = vlan->first_client; vc != NULL; vc = vc->next)
2047         if (!strcmp(vc->name, device))
2048             break;
2049
2050     if (!vc) {
2051         term_printf("can't find device %s\n", device);
2052         return;
2053     }
2054     qemu_del_vlan_client(vc);
2055 }
2056
2057 int net_client_parse(const char *str)
2058 {
2059     const char *p;
2060     char *q;
2061     char device[64];
2062
2063     p = str;
2064     q = device;
2065     while (*p != '\0' && *p != ',') {
2066         if ((q - device) < sizeof(device) - 1)
2067             *q++ = *p;
2068         p++;
2069     }
2070     *q = '\0';
2071     if (*p == ',')
2072         p++;
2073
2074     return net_client_init(device, p);
2075 }
2076
2077 void do_info_network(void)
2078 {
2079     VLANState *vlan;
2080     VLANClientState *vc;
2081
2082     for(vlan = first_vlan; vlan != NULL; vlan = vlan->next) {
2083         term_printf("VLAN %d devices:\n", vlan->id);
2084         for(vc = vlan->first_client; vc != NULL; vc = vc->next)
2085             term_printf("  %s: %s\n", vc->name, vc->info_str);
2086     }
2087 }
2088
2089 int do_set_link(const char *name, const char *up_or_down)
2090 {
2091     VLANState *vlan;
2092     VLANClientState *vc = NULL;
2093
2094     for (vlan = first_vlan; vlan != NULL; vlan = vlan->next)
2095         for (vc = vlan->first_client; vc != NULL; vc = vc->next)
2096             if (strcmp(vc->name, name) == 0)
2097                 goto done;
2098 done:
2099
2100     if (!vc) {
2101         term_printf("could not find network device '%s'", name);
2102         return 0;
2103     }
2104
2105     if (strcmp(up_or_down, "up") == 0)
2106         vc->link_down = 0;
2107     else if (strcmp(up_or_down, "down") == 0)
2108         vc->link_down = 1;
2109     else
2110         term_printf("invalid link status '%s'; only 'up' or 'down' valid\n",
2111                     up_or_down);
2112
2113     if (vc->link_status_changed)
2114         vc->link_status_changed(vc);
2115
2116     return 1;
2117 }
2118
2119 void net_cleanup(void)
2120 {
2121     VLANState *vlan;
2122
2123     /* close network clients */
2124     for(vlan = first_vlan; vlan != NULL; vlan = vlan->next) {
2125         VLANClientState *vc = vlan->first_client;
2126
2127         while (vc) {
2128             VLANClientState *next = vc->next;
2129
2130             qemu_del_vlan_client(vc);
2131
2132             vc = next;
2133         }
2134     }
2135 }
2136
2137 void net_client_check(void)
2138 {
2139     VLANState *vlan;
2140
2141     for(vlan = first_vlan; vlan != NULL; vlan = vlan->next) {
2142         if (vlan->nb_guest_devs == 0 && vlan->nb_host_devs == 0)
2143             continue;
2144         if (vlan->nb_guest_devs == 0)
2145             fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);
2146         if (vlan->nb_host_devs == 0)
2147             fprintf(stderr,
2148                     "Warning: vlan %d is not connected to host network\n",
2149                     vlan->id);
2150     }
2151 }