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