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