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 13#include <stdio.h> 14#include <stdlib.h> 15#include <string.h> 16#include <unistd.h> 17#include <sys/types.h> 18#include <sys/socket.h> 19#include <arpa/inet.h> 20#include <sys/ioctl.h> 21#include <net/if.h> 22#include <net/if_arp.h> 23#include <linux/ip.h> 24#include <linux/if_tunnel.h> 25 26#include "rt_names.h" 27#include "utils.h" 28#include "ip_common.h" 29#include "tunnel.h" 30 31static void usage(void) __attribute__((noreturn)); 32 33static void usage(void) 34{ 35#ifdef NO_IPV6 36 fprintf(stderr, "Usage: ip tunnel { add | change | del | show } [ NAME ]\n"); 37#else 38 fprintf(stderr, "Usage: ip tunnel { add | change | del | show | prl | 6rd } [ NAME ]\n"); 39#endif 40 fprintf(stderr, " [ mode { ipip | gre | sit | isatap } ] [ remote ADDR ] [ local ADDR ]\n"); 41 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"); 42 fprintf(stderr, " [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n"); 43#ifndef NO_IPV6 44 fprintf(stderr, " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n"); 45#endif 46 fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n"); 47 fprintf(stderr, "\n"); 48 fprintf(stderr, "Where: NAME := STRING\n"); 49 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n"); 50 fprintf(stderr, " TOS := { NUMBER | inherit }\n"); 51 fprintf(stderr, " TTL := { 1..255 | inherit }\n"); 52 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n"); 53 exit(-1); 54} 55 56static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p) 57{ 58 int count = 0; 59 char medium[IFNAMSIZ]; 60 int isatap = 0; 61 62 memset(p, 0, sizeof(*p)); 63 memset(&medium, 0, sizeof(medium)); 64 65 p->iph.version = 4; 66 p->iph.ihl = 5; 67#ifndef IP_DF 68#define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 69#endif 70 p->iph.frag_off = htons(IP_DF); 71 72 while (argc > 0) { 73 if (strcmp(*argv, "mode") == 0) { 74 NEXT_ARG(); 75 if (strcmp(*argv, "ipip") == 0 || 76 strcmp(*argv, "ip/ip") == 0) { 77 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) { 78 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 79 exit(-1); 80 } 81 p->iph.protocol = IPPROTO_IPIP; 82 } else if (strcmp(*argv, "gre") == 0 || 83 strcmp(*argv, "gre/ip") == 0) { 84 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) { 85 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 86 exit(-1); 87 } 88 p->iph.protocol = IPPROTO_GRE; 89 } else if (strcmp(*argv, "sit") == 0 || 90 strcmp(*argv, "ipv6/ip") == 0) { 91 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) { 92 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 93 exit(-1); 94 } 95 p->iph.protocol = IPPROTO_IPV6; 96 } else if (strcmp(*argv, "isatap") == 0) { 97 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) { 98 fprintf(stderr, "You managed to ask for more than one tunnel mode.\n"); 99 exit(-1); 100 } 101 p->iph.protocol = IPPROTO_IPV6; 102 isatap++; 103 } else { 104 fprintf(stderr,"Cannot guess tunnel mode.\n"); 105 exit(-1); 106 } 107 } else if (strcmp(*argv, "key") == 0) { 108 unsigned uval; 109 NEXT_ARG(); 110 p->i_flags |= GRE_KEY; 111 p->o_flags |= GRE_KEY; 112 if (strchr(*argv, '.')) 113 p->i_key = p->o_key = get_addr32(*argv); 114 else { 115 if (get_unsigned(&uval, *argv, 0)<0) { 116 fprintf(stderr, "invalid value of \"key\"\n"); 117 exit(-1); 118 } 119 p->i_key = p->o_key = htonl(uval); 120 } 121 } else if (strcmp(*argv, "ikey") == 0) { 122 unsigned uval; 123 NEXT_ARG(); 124 p->i_flags |= GRE_KEY; 125 if (strchr(*argv, '.')) 126 p->i_key = get_addr32(*argv); 127 else { 128 if (get_unsigned(&uval, *argv, 0)<0) { 129 fprintf(stderr, "invalid value of \"ikey\"\n"); 130 exit(-1); 131 } 132 p->i_key = htonl(uval); 133 } 134 } else if (strcmp(*argv, "okey") == 0) { 135 unsigned uval; 136 NEXT_ARG(); 137 p->o_flags |= GRE_KEY; 138 if (strchr(*argv, '.')) 139 p->o_key = get_addr32(*argv); 140 else { 141 if (get_unsigned(&uval, *argv, 0)<0) { 142 fprintf(stderr, "invalid value of \"okey\"\n"); 143 exit(-1); 144 } 145 p->o_key = htonl(uval); 146 } 147 } else if (strcmp(*argv, "seq") == 0) { 148 p->i_flags |= GRE_SEQ; 149 p->o_flags |= GRE_SEQ; 150 } else if (strcmp(*argv, "iseq") == 0) { 151 p->i_flags |= GRE_SEQ; 152 } else if (strcmp(*argv, "oseq") == 0) { 153 p->o_flags |= GRE_SEQ; 154 } else if (strcmp(*argv, "csum") == 0) { 155 p->i_flags |= GRE_CSUM; 156 p->o_flags |= GRE_CSUM; 157 } else if (strcmp(*argv, "icsum") == 0) { 158 p->i_flags |= GRE_CSUM; 159 } else if (strcmp(*argv, "ocsum") == 0) { 160 p->o_flags |= GRE_CSUM; 161 } else if (strcmp(*argv, "nopmtudisc") == 0) { 162 p->iph.frag_off = 0; 163 } else if (strcmp(*argv, "pmtudisc") == 0) { 164 p->iph.frag_off = htons(IP_DF); 165 } else if (strcmp(*argv, "remote") == 0) { 166 NEXT_ARG(); 167 if (strcmp(*argv, "any")) 168 p->iph.daddr = get_addr32(*argv); 169 } else if (strcmp(*argv, "local") == 0) { 170 NEXT_ARG(); 171 if (strcmp(*argv, "any")) 172 p->iph.saddr = get_addr32(*argv); 173 } else if (strcmp(*argv, "dev") == 0) { 174 NEXT_ARG(); 175 strncpy(medium, *argv, IFNAMSIZ-1); 176 } else if (strcmp(*argv, "ttl") == 0 || 177 strcmp(*argv, "hoplimit") == 0) { 178 unsigned uval; 179 NEXT_ARG(); 180 if (strcmp(*argv, "inherit") != 0) { 181 if (get_unsigned(&uval, *argv, 0)) 182 invarg("invalid TTL\n", *argv); 183 if (uval > 255) 184 invarg("TTL must be <=255\n", *argv); 185 p->iph.ttl = uval; 186 } 187 } else if (strcmp(*argv, "tos") == 0 || 188 strcmp(*argv, "tclass") == 0 || 189 matches(*argv, "dsfield") == 0) { 190 __u32 uval; 191 NEXT_ARG(); 192 if (strcmp(*argv, "inherit") != 0) { 193 if (rtnl_dsfield_a2n(&uval, *argv)) 194 invarg("bad TOS value", *argv); 195 p->iph.tos = uval; 196 } else 197 p->iph.tos = 1; 198 } else { 199 if (strcmp(*argv, "name") == 0) { 200 NEXT_ARG(); 201 } else if (matches(*argv, "help") == 0) 202 usage(); 203 if (p->name[0]) 204 duparg2("name", *argv); 205 strncpy(p->name, *argv, IFNAMSIZ); 206 if (cmd == SIOCCHGTUNNEL && count == 0) { 207 struct ip_tunnel_parm old_p; 208 memset(&old_p, 0, sizeof(old_p)); 209 if (tnl_get_ioctl(*argv, &old_p)) 210 return -1; 211 *p = old_p; 212 } 213 } 214 count++; 215 argc--; argv++; 216 } 217 218 219 if (p->iph.protocol == 0) { 220 if (memcmp(p->name, "gre", 3) == 0) 221 p->iph.protocol = IPPROTO_GRE; 222 else if (memcmp(p->name, "ipip", 4) == 0) 223 p->iph.protocol = IPPROTO_IPIP; 224 else if (memcmp(p->name, "sit", 3) == 0) 225 p->iph.protocol = IPPROTO_IPV6; 226 else if (memcmp(p->name, "isatap", 6) == 0) { 227 p->iph.protocol = IPPROTO_IPV6; 228 isatap++; 229 } 230 } 231 232 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) { 233 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) { 234 fprintf(stderr, "Keys are not allowed with ipip and sit.\n"); 235 return -1; 236 } 237 } 238 239 if (medium[0]) { 240 p->link = if_nametoindex(medium); 241 if (p->link == 0) 242 return -1; 243 } 244 245 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) { 246 p->i_key = p->iph.daddr; 247 p->i_flags |= GRE_KEY; 248 } 249 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) { 250 p->o_key = p->iph.daddr; 251 p->o_flags |= GRE_KEY; 252 } 253 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) { 254 fprintf(stderr, "Broadcast tunnel requires a source address.\n"); 255 return -1; 256 } 257 if (isatap) 258 p->i_flags |= SIT_ISATAP; 259 260 return 0; 261} 262 263 264static int do_add(int cmd, int argc, char **argv) 265{ 266 struct ip_tunnel_parm p; 267 268 if (parse_args(argc, argv, cmd, &p) < 0) 269 return -1; 270 271 if (p.iph.ttl && p.iph.frag_off == 0) { 272 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n"); 273 return -1; 274 } 275 276 switch (p.iph.protocol) { 277 case IPPROTO_IPIP: 278 return tnl_add_ioctl(cmd, "tunl0", p.name, &p); 279 case IPPROTO_GRE: 280 return tnl_add_ioctl(cmd, "gre0", p.name, &p); 281 case IPPROTO_IPV6: 282 return tnl_add_ioctl(cmd, "sit0", p.name, &p); 283 default: 284 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n"); 285 return -1; 286 } 287 return -1; 288} 289 290static int do_del(int argc, char **argv) 291{ 292 struct ip_tunnel_parm p; 293 294 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0) 295 return -1; 296 297 switch (p.iph.protocol) { 298 case IPPROTO_IPIP: 299 return tnl_del_ioctl("tunl0", p.name, &p); 300 case IPPROTO_GRE: 301 return tnl_del_ioctl("gre0", p.name, &p); 302 case IPPROTO_IPV6: 303 return tnl_del_ioctl("sit0", p.name, &p); 304 default: 305 return tnl_del_ioctl(p.name, p.name, &p); 306 } 307 return -1; 308} 309 310static void print_tunnel(struct ip_tunnel_parm *p) 311{ 312#ifndef NO_IPV6 313 struct ip_tunnel_6rd ip6rd; 314#endif 315 char s1[1024]; 316 char s2[1024]; 317 318#ifndef NO_IPV6 319 memset(&ip6rd, 0, sizeof(ip6rd)); 320#endif 321 322 /* Do not use format_host() for local addr, 323 * symbolic name will not be useful. 324 */ 325 printf("%s: %s/ip remote %s local %s ", 326 p->name, 327 tnl_strproto(p->iph.protocol), 328 p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any", 329 p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any"); 330 331 if (p->i_flags & SIT_ISATAP) { 332 struct ip_tunnel_prl prl[16]; 333 int i; 334 335 memset(prl, 0, sizeof(prl)); 336 prl[0].datalen = sizeof(prl) - sizeof(prl[0]); 337 prl[0].addr = htonl(INADDR_ANY); 338 339 if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl)) 340 for (i = 1; i < sizeof(prl) / sizeof(prl[0]); i++) 341 { 342 if (prl[i].addr != htonl(INADDR_ANY)) { 343 printf(" %s %s ", 344 (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr", 345 format_host(AF_INET, 4, &prl[i].addr, s1, sizeof(s1))); 346 } 347 } 348 } 349 350 if (p->link) { 351 const char *n = ll_index_to_name(p->link); 352 if (n) 353 printf(" dev %s ", n); 354 } 355 356 if (p->iph.ttl) 357 printf(" ttl %d ", p->iph.ttl); 358 else 359 printf(" ttl inherit "); 360 361 if (p->iph.tos) { 362 SPRINT_BUF(b1); 363 printf(" tos"); 364 if (p->iph.tos&1) 365 printf(" inherit"); 366 if (p->iph.tos&~1) 367 printf("%c%s ", p->iph.tos&1 ? '/' : ' ', 368 rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1))); 369 } 370 371 if (!(p->iph.frag_off&htons(IP_DF))) 372 printf(" nopmtudisc"); 373 374#ifndef NO_IPV6 375 if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) { 376 printf(" 6rd-prefix %s/%u ", 377 inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)), 378 ip6rd.prefixlen); 379 if (ip6rd.relay_prefix) { 380 printf("6rd-relay_prefix %s/%u ", 381 format_host(AF_INET, 4, &ip6rd.relay_prefix, s1, sizeof(s1)), 382 ip6rd.relay_prefixlen); 383 } 384 } 385#endif 386 387 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key) 388 printf(" key %u", ntohl(p->i_key)); 389 else if ((p->i_flags|p->o_flags)&GRE_KEY) { 390 if (p->i_flags&GRE_KEY) 391 printf(" ikey %u ", ntohl(p->i_key)); 392 if (p->o_flags&GRE_KEY) 393 printf(" okey %u ", ntohl(p->o_key)); 394 } 395 396 if (p->i_flags&GRE_SEQ) 397 printf("%s Drop packets out of sequence.\n", _SL_); 398 if (p->i_flags&GRE_CSUM) 399 printf("%s Checksum in received packet is required.", _SL_); 400 if (p->o_flags&GRE_SEQ) 401 printf("%s Sequence packets on output.", _SL_); 402 if (p->o_flags&GRE_CSUM) 403 printf("%s Checksum output packets.", _SL_); 404} 405 406static int do_tunnels_list(struct ip_tunnel_parm *p) 407{ 408 char name[IFNAMSIZ]; 409 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops, 410 rx_fifo, rx_frame, 411 tx_bytes, tx_packets, tx_errs, tx_drops, 412 tx_fifo, tx_colls, tx_carrier, rx_multi; 413 struct ip_tunnel_parm p1; 414 415 char buf[512]; 416 FILE *fp = fopen("/proc/net/dev", "r"); 417 if (fp == NULL) { 418 perror("fopen"); 419 return -1; 420 } 421 422 /* skip header lines */ 423 if (!fgets(buf, sizeof(buf), fp) || 424 !fgets(buf, sizeof(buf), fp)) { 425 fprintf(stderr, "/proc/net/dev read error\n"); 426 fclose(fp); 427 return -1; 428 } 429 430 while (fgets(buf, sizeof(buf), fp) != NULL) { 431 int index, type; 432 char *ptr; 433 buf[sizeof(buf) - 1] = 0; 434 if ((ptr = strchr(buf, ':')) == NULL || 435 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) { 436 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n"); 437 fclose(fp); 438 return -1; 439 } 440 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld", 441 &rx_bytes, &rx_packets, &rx_errs, &rx_drops, 442 &rx_fifo, &rx_frame, &rx_multi, 443 &tx_bytes, &tx_packets, &tx_errs, &tx_drops, 444 &tx_fifo, &tx_colls, &tx_carrier) != 14) 445 continue; 446 if (p->name[0] && strcmp(p->name, name)) 447 continue; 448 index = ll_name_to_index(name); 449 if (index == 0) 450 continue; 451 type = ll_index_to_type(index); 452 if (type == -1) { 453 fprintf(stderr, "Failed to get type of [%s]\n", name); 454 continue; 455 } 456 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT) 457 continue; 458 memset(&p1, 0, sizeof(p1)); 459 if (tnl_get_ioctl(name, &p1)) 460 continue; 461 if ((p->link && p1.link != p->link) || 462 (p->name[0] && strcmp(p1.name, p->name)) || 463 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) || 464 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) || 465 (p->i_key && p1.i_key != p->i_key)) 466 continue; 467 print_tunnel(&p1); 468 if (show_stats) { 469 printf("%s", _SL_); 470 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_); 471 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s", 472 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_); 473 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_); 474 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld", 475 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops); 476 } 477 printf("\n"); 478 } 479 fclose(fp); 480 return 0; 481} 482 483static int do_show(int argc, char **argv) 484{ 485 int err; 486 struct ip_tunnel_parm p; 487 488 ll_init_map(&rth); 489 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0) 490 return -1; 491 492 switch (p.iph.protocol) { 493 case IPPROTO_IPIP: 494 err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p); 495 break; 496 case IPPROTO_GRE: 497 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p); 498 break; 499 case IPPROTO_IPV6: 500 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p); 501 break; 502 default: 503 do_tunnels_list(&p); 504 return 0; 505 } 506 if (err) 507 return -1; 508 509 print_tunnel(&p); 510 printf("\n"); 511 return 0; 512} 513 514static int do_prl(int argc, char **argv) 515{ 516 struct ip_tunnel_prl p; 517 int count = 0; 518 int devname = 0; 519 int cmd = 0; 520 char medium[IFNAMSIZ]; 521 522 memset(&p, 0, sizeof(p)); 523 memset(&medium, 0, sizeof(medium)); 524 525 while (argc > 0) { 526 if (strcmp(*argv, "prl-default") == 0) { 527 NEXT_ARG(); 528 cmd = SIOCADDPRL; 529 p.addr = get_addr32(*argv); 530 p.flags |= PRL_DEFAULT; 531 count++; 532 } else if (strcmp(*argv, "prl-nodefault") == 0) { 533 NEXT_ARG(); 534 cmd = SIOCADDPRL; 535 p.addr = get_addr32(*argv); 536 count++; 537 } else if (strcmp(*argv, "prl-delete") == 0) { 538 NEXT_ARG(); 539 cmd = SIOCDELPRL; 540 p.addr = get_addr32(*argv); 541 count++; 542 } else if (strcmp(*argv, "dev") == 0) { 543 NEXT_ARG(); 544 strncpy(medium, *argv, IFNAMSIZ-1); 545 devname++; 546 } else { 547 fprintf(stderr,"%s: Invalid PRL parameter.\n", *argv); 548 exit(-1); 549 } 550 if (count > 1) { 551 fprintf(stderr,"One PRL entry at a time.\n"); 552 exit(-1); 553 } 554 argc--; argv++; 555 } 556 if (devname == 0) { 557 fprintf(stderr, "Must specify dev.\n"); 558 exit(-1); 559 } 560 561 return tnl_prl_ioctl(cmd, medium, &p); 562} 563 564#ifndef NO_IPV6 565static int do_6rd(int argc, char **argv) 566{ 567 struct ip_tunnel_6rd ip6rd; 568 int devname = 0; 569 int cmd = 0; 570 char medium[IFNAMSIZ]; 571 inet_prefix prefix; 572 573 memset(&ip6rd, 0, sizeof(ip6rd)); 574 memset(&medium, 0, sizeof(medium)); 575 576 while (argc > 0) { 577 if (strcmp(*argv, "6rd-prefix") == 0) { 578 NEXT_ARG(); 579 if (get_prefix(&prefix, *argv, AF_INET6)) 580 invarg("invalid 6rd_prefix\n", *argv); 581 cmd = SIOCADD6RD; 582 memcpy(&ip6rd.prefix, prefix.data, 16); 583 ip6rd.prefixlen = prefix.bitlen; 584 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) { 585 NEXT_ARG(); 586 if (get_prefix(&prefix, *argv, AF_INET)) 587 invarg("invalid 6rd-relay_prefix\n", *argv); 588 cmd = SIOCADD6RD; 589 memcpy(&ip6rd.relay_prefix, prefix.data, 4); 590 ip6rd.relay_prefixlen = prefix.bitlen; 591 } else if (strcmp(*argv, "6rd-reset") == 0) { 592 cmd = SIOCDEL6RD; 593 } else if (strcmp(*argv, "dev") == 0) { 594 NEXT_ARG(); 595 strncpy(medium, *argv, IFNAMSIZ-1); 596 devname++; 597 } else { 598 fprintf(stderr,"%s: Invalid 6RD parameter.\n", *argv); 599 exit(-1); 600 } 601 argc--; argv++; 602 } 603 if (devname == 0) { 604 fprintf(stderr, "Must specify dev.\n"); 605 exit(-1); 606 } 607 608 return tnl_6rd_ioctl(cmd, medium, &ip6rd); 609} 610#endif 611 612int do_iptunnel(int argc, char **argv) 613{ 614 switch (preferred_family) { 615 case AF_UNSPEC: 616 preferred_family = AF_INET; 617 break; 618 case AF_INET: 619 break; 620#ifndef NO_IPV6 621 /* 622 * This is silly enough but we have no easy way to make it 623 * protocol-independent because of unarranged structure between 624 * IPv4 and IPv6. 625 */ 626 case AF_INET6: 627 return do_ip6tunnel(argc, argv); 628#endif 629 default: 630 fprintf(stderr, "Unsupported family:%d\n", preferred_family); 631 exit(-1); 632 } 633 634 if (argc > 0) { 635 if (matches(*argv, "add") == 0) 636 return do_add(SIOCADDTUNNEL, argc-1, argv+1); 637 if (matches(*argv, "change") == 0) 638 return do_add(SIOCCHGTUNNEL, argc-1, argv+1); 639 if (matches(*argv, "del") == 0) 640 return do_del(argc-1, argv+1); 641 if (matches(*argv, "show") == 0 || 642 matches(*argv, "lst") == 0 || 643 matches(*argv, "list") == 0) 644 return do_show(argc-1, argv+1); 645 if (matches(*argv, "prl") == 0) 646 return do_prl(argc-1, argv+1); 647#ifndef NO_IPV6 648 if (matches(*argv, "6rd") == 0) 649 return do_6rd(argc-1, argv+1); 650#endif 651 if (matches(*argv, "help") == 0) 652 usage(); 653 } else 654 return do_show(0, NULL); 655 656 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv); 657 exit(-1); 658} 659