iptunnel.c

   1 /*
   2  * iptunnel.c          "ip tunnel"
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  *
  12  * Changes:
  13  *
  14  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  15  * Rani Assaf <rani@magic.metawire.com> 980930: do not allow key for ipip/sit
  16  * Bernd Eckenfels 990715: add linux/types.h (not clean but solves missing __u16
  17  * Arnaldo Carvalho de Melo 20010404: use setlocale
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <syslog.h>
  25 #include <fcntl.h>
  26 #include <sys/socket.h>
  27 #include <sys/ioctl.h>
  28 #include <netinet/in.h>
  29 #include <netinet/ip.h>
  30 #include <arpa/inet.h>
  31 #if defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
  32 #include <net/if.h>
  33 #include <net/if_arp.h>
  34 #else
  35 #include <linux/if.h>
  36 #include <linux/if_arp.h>
  37 #endif
  38 #include <linux/types.h>
  39 #include <linux/if_tunnel.h>
  40
  41 #include "config.h"
  42 #include "intl.h"
  43 #include "net-support.h"
  44 #include "version.h"
  45 #include "util.h"
  46
  47 #undef GRE_CSUM
  48 #define GRE_CSUM        htons(0x8000)
  49 #undef GRE_ROUTING
  50 #define GRE_ROUTING     htons(0x4000)
  51 #undef GRE_KEY
  52 #define GRE_KEY         htons(0x2000)
  53 #undef GRE_SEQ
  54 #define GRE_SEQ         htons(0x1000)
  55 #undef GRE_STRICT
  56 #define GRE_STRICT      htons(0x0800)
  57 #undef GRE_REC
  58 #define GRE_REC         htons(0x0700)
  59 #undef GRE_FLAGS
  60 #define GRE_FLAGS       htons(0x00F8)
  61 #undef GRE_VERSION
  62 #define GRE_VERSION     htons(0x0007)
  63
  64 /* Old versions of glibc do not define this */
  65 #if __GLIBC__ == 2 && __GLIBC_MINOR__ == 0
  66 #define IPPROTO_GRE     47
  67 #endif
  68
  69 #include "util-ank.h"
  70
  71 char *Release = RELEASE,
  72      *Version = "iptunnel 1.01",
  73      *Signature = "Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>";
  74
  75 static void version(void)
  76 {
  77         printf("%s\n%s\n%s\n", Release, Version, Signature);
  78         exit(E_VERSION);
  79 }
  80
  81 static void usage(void) __attribute__((noreturn));
  82
  83 static void usage(void)
  84 {
  85         fprintf(stderr, _("Usage: iptunnel { add | change | del | show } [ NAME ]\n"));
  86         fprintf(stderr, _("          [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]\n"));
  87         fprintf(stderr, _("          [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"));
  88         fprintf(stderr, _("          [ ttl TTL ] [ tos TOS ] [ nopmtudisc ] [ dev PHYS_DEV ]\n"));
  89         fprintf(stderr, _("       iptunnel -V | --version\n\n"));
  90         fprintf(stderr, _("Where: NAME := STRING\n"));
  91         fprintf(stderr, _("       ADDR := { IP_ADDRESS | any }\n"));
  92         fprintf(stderr, _("       TOS  := { NUMBER | inherit }\n"));
  93         fprintf(stderr, _("       TTL  := { 1..255 | inherit }\n"));
  94         fprintf(stderr, _("       KEY  := { DOTTED_QUAD | NUMBER }\n"));
  95         exit(-1);
  96 }
  97
  98 static int do_ioctl_get_ifindex(char *dev)
  99 {
 100         struct ifreq ifr;
 101         int fd;
 102         int err;
 103
 104         strcpy(ifr.ifr_name, dev);
 105         fd = socket(AF_INET, SOCK_DGRAM, 0);
 106         err = ioctl(fd, SIOCGIFINDEX, &ifr);
 107         if (err) {
 108                 perror("ioctl");
 109                 return 0;
 110         }
 111         close(fd);
 112         return ifr.ifr_ifindex;
 113 }
 114
 115 static int do_ioctl_get_iftype(char *dev)
 116 {
 117         struct ifreq ifr;
 118         int fd;
 119         int err;
 120
 121         strcpy(ifr.ifr_name, dev);
 122         fd = socket(AF_INET, SOCK_DGRAM, 0);
 123         err = ioctl(fd, SIOCGIFHWADDR, &ifr);
 124         if (err) {
 125                 perror("ioctl");
 126                 return -1;
 127         }
 128         close(fd);
 129         return ifr.ifr_addr.sa_family;
 130 }
 131
 132
 133 static char * do_ioctl_get_ifname(int idx)
 134 {
 135         static struct ifreq ifr;
 136         int fd;
 137         int err;
 138
 139         ifr.ifr_ifindex = idx;
 140         fd = socket(AF_INET, SOCK_DGRAM, 0);
 141         err = ioctl(fd, SIOCGIFNAME, &ifr);
 142         if (err) {
 143                 perror("ioctl");
 144                 return NULL;
 145         }
 146         close(fd);
 147         return ifr.ifr_name;
 148 }
 149
 150
 151
 152 static int do_get_ioctl(char *basedev, struct ip_tunnel_parm *p)
 153 {
 154         struct ifreq ifr;
 155         int fd;
 156         int err;
 157
 158         strcpy(ifr.ifr_name, basedev);
 159         ifr.ifr_ifru.ifru_data = (void*)p;
 160         fd = socket(AF_INET, SOCK_DGRAM, 0);
 161         err = ioctl(fd, SIOCGETTUNNEL, &ifr);
 162         if (err)
 163                 perror("ioctl");
 164         close(fd);
 165         return err;
 166 }
 167
 168 static int do_add_ioctl(int cmd, char *basedev, struct ip_tunnel_parm *p)
 169 {
 170         struct ifreq ifr;
 171         int fd;
 172         int err;
 173
 174         strcpy(ifr.ifr_name, basedev);
 175         ifr.ifr_ifru.ifru_data = (void*)p;
 176         fd = socket(AF_INET, SOCK_DGRAM, 0);
 177         err = ioctl(fd, cmd, &ifr);
 178         if (err)
 179                 perror("ioctl");
 180         close(fd);
 181         return err;
 182 }
 183
 184 static int do_del_ioctl(char *basedev, struct ip_tunnel_parm *p)
 185 {
 186         struct ifreq ifr;
 187         int fd;
 188         int err;
 189
 190         strcpy(ifr.ifr_name, basedev);
 191         ifr.ifr_ifru.ifru_data = (void*)p;
 192         fd = socket(AF_INET, SOCK_DGRAM, 0);
 193         err = ioctl(fd, SIOCDELTUNNEL, &ifr);
 194         if (err)
 195                 perror("ioctl");
 196         close(fd);
 197         return err;
 198 }
 199
 200 static int parse_args(int argc, char **argv, struct ip_tunnel_parm *p)
 201 {
 202         char medium[IFNAMSIZ];
 203
 204         memset(p, 0, sizeof(*p));
 205         memset(&medium, 0, sizeof(medium));
 206
 207         p->iph.version = 4;
 208         p->iph.ihl = 5;
 209 #ifndef IP_DF
 210 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
 211 #endif
 212         p->iph.frag_off = htons(IP_DF);
 213
 214         while (argc > 0) {
 215                 if (strcmp(*argv, "mode") == 0) {
 216                         NEXT_ARG();
 217                         if (strcmp(*argv, "ipip") == 0) {
 218                                 if (p->iph.protocol)
 219                                         usage();
 220                                 p->iph.protocol = IPPROTO_IPIP;
 221                         } else if (strcmp(*argv, "gre") == 0) {
 222                                 if (p->iph.protocol)
 223                                         usage();
 224                                 p->iph.protocol = IPPROTO_GRE;
 225                         } else if (strcmp(*argv, "sit") == 0) {
 226                                 if (p->iph.protocol)
 227                                         usage();
 228                                 p->iph.protocol = IPPROTO_IPV6;
 229                         } else
 230                                 usage();
 231                 } else if (strcmp(*argv, "key") == 0) {
 232                         unsigned uval;
 233                         NEXT_ARG();
 234                         p->i_flags |= GRE_KEY;
 235                         p->o_flags |= GRE_KEY;
 236                         if (strchr(*argv, '.'))
 237                                 p->i_key = p->o_key = get_addr32(*argv);
 238                         else {
 239                                 if (scan_number(*argv, &uval)<0)
 240                                         usage();
 241                                 p->i_key = p->o_key = htonl(uval);
 242                         }
 243                 } else if (strcmp(*argv, "ikey") == 0) {
 244                         unsigned uval;
 245                         NEXT_ARG();
 246                         p->i_flags |= GRE_KEY;
 247                         if (strchr(*argv, '.'))
 248                                 p->o_key = get_addr32(*argv);
 249                         else {
 250                                 if (scan_number(*argv, &uval)<0)
 251                                         usage();
 252                                 p->i_key = htonl(uval);
 253                         }
 254                 } else if (strcmp(*argv, "okey") == 0) {
 255                         unsigned uval;
 256                         NEXT_ARG();
 257                         p->o_flags |= GRE_KEY;
 258                         if (strchr(*argv, '.'))
 259                                 p->o_key = get_addr32(*argv);
 260                         else {
 261                                 if (scan_number(*argv, &uval)<0)
 262                                         usage();
 263                                 p->o_key = htonl(uval);
 264                         }
 265                 } else if (strcmp(*argv, "seq") == 0) {
 266                         p->i_flags |= GRE_SEQ;
 267                         p->o_flags |= GRE_SEQ;
 268                 } else if (strcmp(*argv, "iseq") == 0) {
 269                         p->i_flags |= GRE_SEQ;
 270                 } else if (strcmp(*argv, "oseq") == 0) {
 271                         p->o_flags |= GRE_SEQ;
 272                 } else if (strcmp(*argv, "csum") == 0) {
 273                         p->i_flags |= GRE_CSUM;
 274                         p->o_flags |= GRE_CSUM;
 275                 } else if (strcmp(*argv, "icsum") == 0) {
 276                         p->i_flags |= GRE_CSUM;
 277                 } else if (strcmp(*argv, "ocsum") == 0) {
 278                         p->o_flags |= GRE_CSUM;
 279                 } else if (strcmp(*argv, "nopmtudisc") == 0) {
 280                         p->iph.frag_off = 0;
 281                 } else if (strcmp(*argv, "remote") == 0) {
 282                         NEXT_ARG();
 283                         if (strcmp(*argv, "any"))
 284                                 p->iph.daddr = get_addr32(*argv);
 285                 } else if (strcmp(*argv, "local") == 0) {
 286                         NEXT_ARG();
 287                         if (strcmp(*argv, "any"))
 288                                 p->iph.saddr = get_addr32(*argv);
 289                 } else if (strcmp(*argv, "dev") == 0) {
 290                         NEXT_ARG();
 291                         safe_strncpy(medium, *argv, IFNAMSIZ-1);
 292                 } else if (strcmp(*argv, "ttl") == 0) {
 293                         unsigned uval;
 294                         NEXT_ARG();
 295                         if (strcmp(*argv, "inherit") != 0) {
 296                                 if (scan_number(*argv, &uval)<0)
 297                                         usage();
 298                                 if (uval > 255)
 299                                         usage();
 300                                 p->iph.ttl = uval;
 301                         }
 302                 } else if (strcmp(*argv, "tos") == 0) {
 303                         unsigned uval;
 304                         NEXT_ARG();
 305                         if (strcmp(*argv, "inherit") != 0) {
 306                                 if (scan_number(*argv, &uval)<0)
 307                                         usage();
 308                                 if (uval > 255)
 309                                         usage();
 310                                 p->iph.tos = uval;
 311                         } else
 312                                 p->iph.tos = 1;
 313                 } else {
 314                         if (p->name[0])
 315                                 usage();
 316                         safe_strncpy(p->name, *argv, IFNAMSIZ);
 317                 }
 318                 argc--; argv++;
 319         }
 320
 321         if (p->iph.protocol == 0) {
 322                 if (memcmp(p->name, "gre", 3) == 0)
 323                         p->iph.protocol = IPPROTO_GRE;
 324                 else if (memcmp(p->name, "ipip", 4) == 0)
 325                         p->iph.protocol = IPPROTO_IPIP;
 326                 else if (memcmp(p->name, "sit", 3) == 0)
 327                         p->iph.protocol = IPPROTO_IPV6;
 328         }
 329
 330         if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
 331                 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
 332                         fprintf(stderr, _("Keys are not allowed with ipip and sit.\n"));
 333                         return -1;
 334                 }
 335         }
 336
 337         if (medium[0]) {
 338                 p->link = do_ioctl_get_ifindex(medium);
 339                 if (p->link == 0)
 340                         return -1;
 341         }
 342
 343         if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
 344                 p->i_key = p->iph.daddr;
 345                 p->i_flags |= GRE_KEY;
 346         }
 347         if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
 348                 p->o_key = p->iph.daddr;
 349                 p->o_flags |= GRE_KEY;
 350         }
 351         if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
 352                 fprintf(stderr, _("Broadcast tunnel requires a source address.\n"));
 353                 return -1;
 354         }
 355         return 0;
 356 }
 357
 358
 359 static int do_add(int cmd, int argc, char **argv)
 360 {
 361         struct ip_tunnel_parm p;
 362
 363         if (parse_args(argc, argv, &p) < 0)
 364                 return -1;
 365
 366         if (p.iph.ttl && p.iph.frag_off == 0) {
 367                 fprintf(stderr, _("ttl != 0 and noptmudisc are incompatible\n"));
 368                 return -1;
 369         }
 370
 371         switch (p.iph.protocol) {
 372         case IPPROTO_IPIP:
 373                 return do_add_ioctl(cmd, "tunl0", &p);
 374         case IPPROTO_GRE:
 375                 return do_add_ioctl(cmd, "gre0", &p);
 376         case IPPROTO_IPV6:
 377                 return do_add_ioctl(cmd, "sit0", &p);
 378         default:
 379                 fprintf(stderr, _("cannot determine tunnel mode (ipip, gre or sit)\n"));
 380                 return -1;
 381         }
 382         return -1;
 383 }
 384
 385 int do_del(int argc, char **argv)
 386 {
 387         struct ip_tunnel_parm p;
 388
 389         if (parse_args(argc, argv, &p) < 0)
 390                 return -1;
 391
 392         switch (p.iph.protocol) {
 393         case IPPROTO_IPIP:
 394                 return do_del_ioctl(p.name[0] ? p.name : "tunl0", &p);
 395         case IPPROTO_GRE:
 396                 return do_del_ioctl(p.name[0] ? p.name : "gre0", &p);
 397         case IPPROTO_IPV6:
 398                 return do_del_ioctl(p.name[0] ? p.name : "sit0", &p);
 399         default:
 400                 return do_del_ioctl(p.name, &p);
 401         }
 402         return -1;
 403 }
 404
 405 void print_tunnel(struct ip_tunnel_parm *p)
 406 {
 407         char s1[256];
 408         char s2[256];
 409         char s3[64];
 410         char s4[64];
 411
 412         format_host(AF_INET, &p->iph.daddr, s1, sizeof(s1));
 413         format_host(AF_INET, &p->iph.saddr, s2, sizeof(s2));
 414         inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
 415         inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
 416
 417         printf(_("%s: %s/ip  remote %s  local %s "),
 418                p->name,
 419                p->iph.protocol == IPPROTO_IPIP ? "ip" :
 420                (p->iph.protocol == IPPROTO_GRE ? "gre" :
 421                 (p->iph.protocol == IPPROTO_IPV6 ? "ipv6" : _("unknown"))),
 422                p->iph.daddr ? s1 : "any", p->iph.saddr ? s2 : "any");
 423         if (p->link) {
 424                 char *n = do_ioctl_get_ifname(p->link);
 425                 if (n)
 426                         printf(" dev %s ", n);
 427         }
 428         if (p->iph.ttl)
 429                 printf(" ttl %d ", p->iph.ttl);
 430         else
 431                 printf(" ttl inherit ");
 432         if (p->iph.tos) {
 433                 printf(" tos");
 434                 if (p->iph.tos&1)
 435                         printf(" inherit");
 436                 if (p->iph.tos&~1)
 437                         printf("%c%02x ", p->iph.tos&1 ? '/' : ' ', p->iph.tos&~1);
 438         }
 439         if (!(p->iph.frag_off&htons(IP_DF)))
 440                 printf(" nopmtudisc");
 441
 442         if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
 443                 printf(" key %s", s3);
 444         else if ((p->i_flags|p->o_flags)&GRE_KEY) {
 445                 if (p->i_flags&GRE_KEY)
 446                         printf(" ikey %s ", s3);
 447                 if (p->o_flags&GRE_KEY)
 448                         printf(" okey %s ", s4);
 449         }
 450         printf("\n");
 451
 452         if (p->i_flags&GRE_SEQ)
 453                 printf(_("  Drop packets out of sequence.\n"));
 454         if (p->i_flags&GRE_CSUM)
 455                 printf(_("  Checksum in received packet is required.\n"));
 456         if (p->o_flags&GRE_SEQ)
 457                 printf(_("  Sequence packets on output.\n"));
 458         if (p->o_flags&GRE_CSUM)
 459                 printf(_("  Checksum output packets.\n"));
 460 }
 461
 462 static int do_tunnels_list(struct ip_tunnel_parm *p)
 463 {
 464         char name[IFNAMSIZ];
 465         unsigned long  rx_bytes, rx_packets, rx_errs, rx_drops,
 466         rx_fifo, rx_frame,
 467         tx_bytes, tx_packets, tx_errs, tx_drops,
 468         tx_fifo, tx_colls, tx_carrier, rx_multi;
 469         int type;
 470         struct ip_tunnel_parm p1;
 471
 472         char buf[512];
 473         FILE *fp = fopen("/proc/net/dev", "r");
 474         if (fp == NULL) {
 475                 perror("fopen");
 476                 return -1;
 477         }
 478
 479         fgets(buf, sizeof(buf), fp);
 480         fgets(buf, sizeof(buf), fp);
 481
 482         while (fgets(buf, sizeof(buf), fp) != NULL) {
 483                 char *ptr;
 484                 buf[sizeof(buf) - 1] = 0;
 485                 if ((ptr = strchr(buf, ':')) == NULL ||
 486                     (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
 487                         fprintf(stderr, _("Wrong format of /proc/net/dev. Sorry.\n"));
 488                         return -1;
 489                 }
 490                 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
 491                            &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
 492                            &rx_fifo, &rx_frame, &rx_multi,
 493                            &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
 494                            &tx_fifo, &tx_colls, &tx_carrier) != 14)
 495                         continue;
 496                 if (p->name[0] && strcmp(p->name, name))
 497                         continue;
 498                 type = do_ioctl_get_iftype(name);
 499                 if (type == -1) {
 500                         fprintf(stderr, _("Failed to get type of [%s]\n"), name);
 501                         continue;
 502                 }
 503                 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
 504                         continue;
 505                 memset(&p1, 0, sizeof(p1));
 506                 if (do_get_ioctl(name, &p1))
 507                         continue;
 508                 if ((p->link && p1.link != p->link) ||
 509                     (p->name[0] && strcmp(p1.name, p->name)) ||
 510                     (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
 511                     (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
 512                     (p->i_key && p1.i_key != p->i_key))
 513                         continue;
 514                 print_tunnel(&p1);
 515                 if (show_stats) {
 516                         printf(_("RX: Packets    Bytes        Errors CsumErrs OutOfSeq Mcasts\n"));
 517                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld\n",
 518                                rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi);
 519                         printf(_("TX: Packets    Bytes        Errors DeadLoop NoRoute  NoBufs\n"));
 520                         printf("    %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld\n\n",
 521                                tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
 522                 }
 523         }
 524         return 0;
 525 }
 526
 527 static int do_show(int argc, char **argv)
 528 {
 529         int err;
 530         struct ip_tunnel_parm p;
 531
 532         if (parse_args(argc, argv, &p) < 0)
 533                 return -1;
 534
 535         switch (p.iph.protocol) {
 536         case IPPROTO_IPIP:
 537                 err = do_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
 538                 break;
 539         case IPPROTO_GRE:
 540                 err = do_get_ioctl(p.name[0] ? p.name : "gre0", &p);
 541                 break;
 542         case IPPROTO_IPV6:
 543                 err = do_get_ioctl(p.name[0] ? p.name : "sit0", &p);
 544                 break;
 545         default:
 546                 do_tunnels_list(&p);
 547                 return 0;
 548         }
 549         if (err)
 550                 return -1;
 551
 552         print_tunnel(&p);
 553         return 0;
 554 }
 555
 556 int do_iptunnel(int argc, char **argv)
 557 {
 558         if (argc > 0) {
 559                 if (matches(*argv, "add") == 0)
 560                         return do_add(SIOCADDTUNNEL, argc-1, argv+1);
 561                 if (matches(*argv, "change") == 0)
 562                         return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
 563                 if (matches(*argv, "del") == 0)
 564                         return do_del(argc-1, argv+1);
 565                 if (matches(*argv, "show") == 0 ||
 566                     matches(*argv, "lst") == 0 ||
 567                     matches(*argv, "list") == 0)
 568                         return do_show(argc-1, argv+1);
 569         } else
 570                 return do_show(0, NULL);
 571
 572         usage();
 573 }
 574
 575
 576 int preferred_family = AF_UNSPEC;
 577 int show_stats = 0;
 578 int resolve_hosts = 0;
 579
 580 int main(int argc, char **argv)
 581 {
 582         char *basename;
 583
 584 #if I18N
 585         setlocale (LC_ALL, "");
 586         bindtextdomain("net-tools", "/usr/share/locale");
 587         textdomain("net-tools");
 588 #endif
 589
 590         basename = strrchr(argv[0], '/');
 591         if (basename == NULL)
 592                 basename = argv[0];
 593         else
 594                 basename++;
 595
 596         while (argc > 1) {
 597                 if (argv[1][0] != '-')
 598                         break;
 599                 if (matches(argv[1], "-family") == 0) {
 600                         argc--;
 601                         argv++;
 602                         if (argc <= 1)
 603                                 usage();
 604                         if (strcmp(argv[1], "inet") == 0)
 605                                 preferred_family = AF_INET;
 606                         else if (strcmp(argv[1], "inet6") == 0)
 607                                 preferred_family = AF_INET6;
 608                         else
 609                                 usage();
 610                 } else if (matches(argv[1], "-stats") == 0 ||
 611                            matches(argv[1], "-statistics") == 0) {
 612                         ++show_stats;
 613                 } else if (matches(argv[1], "-resolve") == 0) {
 614                         ++resolve_hosts;
 615                 } else if ((matches(argv[1], "-V") == 0) || (matches(argv[1], "--version") == 0)) {
 616                         version();
 617                 } else
 618                         usage();
 619                 argc--; argv++;
 620         }
 621
 622         return do_iptunnel(argc-1, argv+1);
 623 }