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 <linux/if.h> 22#include <linux/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 fprintf(stderr, "Usage: ip tunnel { add | change | del | show | prl | 6rd } [ NAME ]\n"); 36 fprintf(stderr, " [ mode { ipip | gre | sit | isatap } ] [ remote ADDR ] [ local ADDR ]\n"); 37 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n"); 38 fprintf(stderr, " [ prl-default ADDR ] [ prl-nodefault ADDR ] [ prl-delete ADDR ]\n"); 39 fprintf(stderr, " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n"); 40 fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n"); 41 fprintf(stderr, "\n"); 42 fprintf(stderr, "Where: NAME := STRING\n"); 43 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n"); 44 fprintf(stderr, " TOS := { NUMBER | inherit }\n"); 45 fprintf(stderr, " TTL := { 1..255 | inherit }\n"); 46 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n"); 47 exit(-1); 48} 49 50static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p) 51{ 52 int count = 0; 53 char medium[IFNAMSIZ]; 54 int isatap = 0; 55 56 memset(p, 0, sizeof(*p)); 57 memset(&medium, 0, sizeof(medium)); 58 59 p->iph.version = 4; 60 p->iph.ihl = 5; 61#ifndef IP_DF 62#define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 63#endif 64 p->iph.frag_off = htons(IP_DF); 65 66 while (argc > 0) { 67 if (strcmp(*argv, "mode") == 0) { 68 NEXT_ARG(); 69 if (strcmp(*argv, "ipip") == 0 || 70 strcmp(*argv, "ip/ip") == 0) { 71 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) { 72 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 73 exit(-1); 74 } 75 p->iph.protocol = IPPROTO_IPIP; 76 } else if (strcmp(*argv, "gre") == 0 || 77 strcmp(*argv, "gre/ip") == 0) { 78 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) { 79 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 80 exit(-1); 81 } 82 p->iph.protocol = IPPROTO_GRE; 83 } else if (strcmp(*argv, "sit") == 0 || 84 strcmp(*argv, "ipv6/ip") == 0) { 85 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) { 86 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 87 exit(-1); 88 } 89 p->iph.protocol = IPPROTO_IPV6; 90 } else if (strcmp(*argv, "isatap") == 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 isatap++; 97 } else { 98 fprintf(stderr,"Cannot guess tunnel mode.\n"); 99 exit(-1); 100 } 101 } else if (strcmp(*argv, "key") == 0) { 102 unsigned uval; 103 NEXT_ARG(); 104 p->i_flags |= GRE_KEY; 105 p->o_flags |= GRE_KEY; 106 if (strchr(*argv, '.')) 107 p->i_key = p->o_key = get_addr32(*argv); 108 else { 109 if (get_unsigned(&uval, *argv, 0)<0) { 110 fprintf(stderr, "invalid value of \"key\"\n"); 111 exit(-1); 112 } 113 p->i_key = p->o_key = htonl(uval); 114 } 115 } else if (strcmp(*argv, "ikey") == 0) { 116 unsigned uval; 117 NEXT_ARG(); 118 p->i_flags |= GRE_KEY; 119 if (strchr(*argv, '.')) 120 p->i_key = get_addr32(*argv); 121 else { 122 if (get_unsigned(&uval, *argv, 0)<0) { 123 fprintf(stderr, "invalid value of \"ikey\"\n"); 124 exit(-1); 125 } 126 p->i_key = htonl(uval); 127 } 128 } else if (strcmp(*argv, "okey") == 0) { 129 unsigned uval; 130 NEXT_ARG(); 131 p->o_flags |= GRE_KEY; 132 if (strchr(*argv, '.')) 133 p->o_key = get_addr32(*argv); 134 else { 135 if (get_unsigned(&uval, *argv, 0)<0) { 136 fprintf(stderr, "invalid value of \"okey\"\n"); 137 exit(-1); 138 } 139 p->o_key = htonl(uval); 140 } 141 } else if (strcmp(*argv, "seq") == 0) { 142 p->i_flags |= GRE_SEQ; 143 p->o_flags |= GRE_SEQ; 144 } else if (strcmp(*argv, "iseq") == 0) { 145 p->i_flags |= GRE_SEQ; 146 } else if (strcmp(*argv, "oseq") == 0) { 147 p->o_flags |= GRE_SEQ; 148 } else if (strcmp(*argv, "csum") == 0) { 149 p->i_flags |= GRE_CSUM; 150 p->o_flags |= GRE_CSUM; 151 } else if (strcmp(*argv, "icsum") == 0) { 152 p->i_flags |= GRE_CSUM; 153 } else if (strcmp(*argv, "ocsum") == 0) { 154 p->o_flags |= GRE_CSUM; 155 } else if (strcmp(*argv, "nopmtudisc") == 0) { 156 p->iph.frag_off = 0; 157 } else if (strcmp(*argv, "pmtudisc") == 0) { 158 p->iph.frag_off = htons(IP_DF); 159 } else if (strcmp(*argv, "remote") == 0) { 160 NEXT_ARG(); 161 if (strcmp(*argv, "any")) 162 p->iph.daddr = get_addr32(*argv); 163 } else if (strcmp(*argv, "local") == 0) { 164 NEXT_ARG(); 165 if (strcmp(*argv, "any")) 166 p->iph.saddr = get_addr32(*argv); 167 } else if (strcmp(*argv, "dev") == 0) { 168 NEXT_ARG(); 169 strncpy(medium, *argv, IFNAMSIZ-1); 170 } else if (strcmp(*argv, "ttl") == 0 || 171 strcmp(*argv, "hoplimit") == 0) { 172 unsigned uval; 173 NEXT_ARG(); 174 if (strcmp(*argv, "inherit") != 0) { 175 if (get_unsigned(&uval, *argv, 0)) 176 invarg("invalid TTL\n", *argv); 177 if (uval > 255) 178 invarg("TTL must be <=255\n", *argv); 179 p->iph.ttl = uval; 180 } 181 } else if (strcmp(*argv, "tos") == 0 || 182 strcmp(*argv, "tclass") == 0 || 183 matches(*argv, "dsfield") == 0) { 184 __u32 uval; 185 NEXT_ARG(); 186 if (strcmp(*argv, "inherit") != 0) { 187 if (rtnl_dsfield_a2n(&uval, *argv)) 188 invarg("bad TOS value", *argv); 189 p->iph.tos = uval; 190 } else 191 p->iph.tos = 1; 192 } else { 193 if (strcmp(*argv, "name") == 0) { 194 NEXT_ARG(); 195 } else if (matches(*argv, "help") == 0) 196 usage(); 197 if (p->name[0]) 198 duparg2("name", *argv); 199 strncpy(p->name, *argv, IFNAMSIZ); 200 if (cmd == SIOCCHGTUNNEL && count == 0) { 201 struct ip_tunnel_parm old_p; 202 memset(&old_p, 0, sizeof(old_p)); 203 if (tnl_get_ioctl(*argv, &old_p)) 204 return -1; 205 *p = old_p; 206 } 207 } 208 count++; 209 argc--; argv++; 210 } 211 212 213 if (p->iph.protocol == 0) { 214 if (memcmp(p->name, "gre", 3) == 0) 215 p->iph.protocol = IPPROTO_GRE; 216 else if (memcmp(p->name, "ipip", 4) == 0) 217 p->iph.protocol = IPPROTO_IPIP; 218 else if (memcmp(p->name, "sit", 3) == 0) 219 p->iph.protocol = IPPROTO_IPV6; 220 else if (memcmp(p->name, "isatap", 6) == 0) { 221 p->iph.protocol = IPPROTO_IPV6; 222 isatap++; 223 } 224 } 225 226 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) { 227 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) { 228 fprintf(stderr, "Keys are not allowed with ipip and sit.\n"); 229 return -1; 230 } 231 } 232 233 if (medium[0]) { 234 p->link = tnl_ioctl_get_ifindex(medium); 235 if (p->link == 0) 236 return -1; 237 } 238 239 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) { 240 p->i_key = p->iph.daddr; 241 p->i_flags |= GRE_KEY; 242 } 243 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) { 244 p->o_key = p->iph.daddr; 245 p->o_flags |= GRE_KEY; 246 } 247 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) { 248 fprintf(stderr, "Broadcast tunnel requires a source address.\n"); 249 return -1; 250 } 251 if (isatap) 252 p->i_flags |= SIT_ISATAP; 253 254 return 0; 255} 256 257 258static int do_add(int cmd, int argc, char **argv) 259{ 260 struct ip_tunnel_parm p; 261 262 if (parse_args(argc, argv, cmd, &p) < 0) 263 return -1; 264 265 if (p.iph.ttl && p.iph.frag_off == 0) { 266 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n"); 267 return -1; 268 } 269 270 switch (p.iph.protocol) { 271 case IPPROTO_IPIP: 272 return tnl_add_ioctl(cmd, "tunl0", p.name, &p); 273 case IPPROTO_GRE: 274 return tnl_add_ioctl(cmd, "gre0", p.name, &p); 275 case IPPROTO_IPV6: 276 return tnl_add_ioctl(cmd, "sit0", p.name, &p); 277 default: 278 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n"); 279 return -1; 280 } 281 return -1; 282} 283 284static int do_del(int argc, char **argv) 285{ 286 struct ip_tunnel_parm p; 287 288 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0) 289 return -1; 290 291 switch (p.iph.protocol) { 292 case IPPROTO_IPIP: 293 return tnl_del_ioctl("tunl0", p.name, &p); 294 case IPPROTO_GRE: 295 return tnl_del_ioctl("gre0", p.name, &p); 296 case IPPROTO_IPV6: 297 return tnl_del_ioctl("sit0", p.name, &p); 298 default: 299 return tnl_del_ioctl(p.name, p.name, &p); 300 } 301 return -1; 302} 303 304static void print_tunnel(struct ip_tunnel_parm *p) 305{ 306 struct ip_tunnel_6rd ip6rd; 307 char s1[1024]; 308 char s2[1024]; 309 char s3[64]; 310 char s4[64]; 311 312 memset(&ip6rd, 0, sizeof(ip6rd)); 313 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3)); 314 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4)); 315 316 /* Do not use format_host() for local addr, 317 * symbolic name will not be useful. 318 */ 319 printf("%s: %s/ip remote %s local %s ", 320 p->name, 321 tnl_strproto(p->iph.protocol), 322 p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any", 323 p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any"); 324 325 if (p->i_flags & SIT_ISATAP) { 326 struct ip_tunnel_prl prl[16]; 327 int i; 328 329 memset(prl, 0, sizeof(prl)); 330 prl[0].datalen = sizeof(prl) - sizeof(prl[0]); 331 prl[0].addr = htonl(INADDR_ANY); 332 333 if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl)) 334 for (i = 1; i < sizeof(prl) / sizeof(prl[0]); i++) 335 { 336 if (prl[i].addr != htonl(INADDR_ANY)) { 337 printf(" %s %s ", 338 (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr", 339 format_host(AF_INET, 4, &prl[i].addr, s1, sizeof(s1))); 340 } 341 } 342 } 343 344 if (p->link) { 345 char *n = tnl_ioctl_get_ifname(p->link); 346 if (n) 347 printf(" dev %s ", n); 348 } 349 350 if (p->iph.ttl) 351 printf(" ttl %d ", p->iph.ttl); 352 else 353 printf(" ttl inherit "); 354 355 if (p->iph.tos) { 356 SPRINT_BUF(b1); 357 printf(" tos"); 358 if (p->iph.tos&1) 359 printf(" inherit"); 360 if (p->iph.tos&~1) 361 printf("%c%s ", p->iph.tos&1 ? '/' : ' ', 362 rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1))); 363 } 364 365 if (!(p->iph.frag_off&htons(IP_DF))) 366 printf(" nopmtudisc"); 367 368 if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) { 369 printf(" 6rd-prefix %s/%u ", 370 inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)), 371 ip6rd.prefixlen); 372 if (ip6rd.relay_prefix) { 373 printf("6rd-relay_prefix %s/%u ", 374 format_host(AF_INET, 4, &ip6rd.relay_prefix, s1, sizeof(s1)), 375 ip6rd.relay_prefixlen); 376 } 377 } 378 379 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key) 380 printf(" key %s", s3); 381 else if ((p->i_flags|p->o_flags)&GRE_KEY) { 382 if (p->i_flags&GRE_KEY) 383 printf(" ikey %s ", s3); 384 if (p->o_flags&GRE_KEY) 385 printf(" okey %s ", s4); 386 } 387 388 if (p->i_flags&GRE_SEQ) 389 printf("%s Drop packets out of sequence.\n", _SL_); 390 if (p->i_flags&GRE_CSUM) 391 printf("%s Checksum in received packet is required.", _SL_); 392 if (p->o_flags&GRE_SEQ) 393 printf("%s Sequence packets on output.", _SL_); 394 if (p->o_flags&GRE_CSUM) 395 printf("%s Checksum output packets.", _SL_); 396} 397 398static int do_tunnels_list(struct ip_tunnel_parm *p) 399{ 400 char name[IFNAMSIZ]; 401 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops, 402 rx_fifo, rx_frame, 403 tx_bytes, tx_packets, tx_errs, tx_drops, 404 tx_fifo, tx_colls, tx_carrier, rx_multi; 405 int type; 406 struct ip_tunnel_parm p1; 407 408 char buf[512]; 409 FILE *fp = fopen("/proc/net/dev", "r"); 410 if (fp == NULL) { 411 perror("fopen"); 412 return -1; 413 } 414 415 fgets(buf, sizeof(buf), fp); 416 fgets(buf, sizeof(buf), fp); 417 418 while (fgets(buf, sizeof(buf), fp) != NULL) { 419 char *ptr; 420 buf[sizeof(buf) - 1] = 0; 421 if ((ptr = strchr(buf, ':')) == NULL || 422 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) { 423 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n"); 424 fclose(fp); 425 return -1; 426 } 427 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld", 428 &rx_bytes, &rx_packets, &rx_errs, &rx_drops, 429 &rx_fifo, &rx_frame, &rx_multi, 430 &tx_bytes, &tx_packets, &tx_errs, &tx_drops, 431 &tx_fifo, &tx_colls, &tx_carrier) != 14) 432 continue; 433 if (p->name[0] && strcmp(p->name, name)) 434 continue; 435 type = tnl_ioctl_get_iftype(name); 436 if (type == -1) { 437 fprintf(stderr, "Failed to get type of [%s]\n", name); 438 continue; 439 } 440 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT) 441 continue; 442 memset(&p1, 0, sizeof(p1)); 443 if (tnl_get_ioctl(name, &p1)) 444 continue; 445 if ((p->link && p1.link != p->link) || 446 (p->name[0] && strcmp(p1.name, p->name)) || 447 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) || 448 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) || 449 (p->i_key && p1.i_key != p->i_key)) 450 continue; 451 print_tunnel(&p1); 452 if (show_stats) { 453 printf("%s", _SL_); 454 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_); 455 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s", 456 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_); 457 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_); 458 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld", 459 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops); 460 } 461 printf("\n"); 462 } 463 fclose(fp); 464 return 0; 465} 466 467static int do_show(int argc, char **argv) 468{ 469 int err; 470 struct ip_tunnel_parm p; 471 472 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0) 473 return -1; 474 475 switch (p.iph.protocol) { 476 case IPPROTO_IPIP: 477 err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p); 478 break; 479 case IPPROTO_GRE: 480 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p); 481 break; 482 case IPPROTO_IPV6: 483 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p); 484 break; 485 default: 486 do_tunnels_list(&p); 487 return 0; 488 } 489 if (err) 490 return -1; 491 492 print_tunnel(&p); 493 printf("\n"); 494 return 0; 495} 496 497static int do_prl(int argc, char **argv) 498{ 499 struct ip_tunnel_prl p; 500 int count = 0; 501 int devname = 0; 502 int cmd = 0; 503 char medium[IFNAMSIZ]; 504 505 memset(&p, 0, sizeof(p)); 506 memset(&medium, 0, sizeof(medium)); 507 508 while (argc > 0) { 509 if (strcmp(*argv, "prl-default") == 0) { 510 NEXT_ARG(); 511 cmd = SIOCADDPRL; 512 p.addr = get_addr32(*argv); 513 p.flags |= PRL_DEFAULT; 514 count++; 515 } else if (strcmp(*argv, "prl-nodefault") == 0) { 516 NEXT_ARG(); 517 cmd = SIOCADDPRL; 518 p.addr = get_addr32(*argv); 519 count++; 520 } else if (strcmp(*argv, "prl-delete") == 0) { 521 NEXT_ARG(); 522 cmd = SIOCDELPRL; 523 p.addr = get_addr32(*argv); 524 count++; 525 } else if (strcmp(*argv, "dev") == 0) { 526 NEXT_ARG(); 527 strncpy(medium, *argv, IFNAMSIZ-1); 528 devname++; 529 } else { 530 fprintf(stderr,"%s: Invalid PRL parameter.\n", *argv); 531 exit(-1); 532 } 533 if (count > 1) { 534 fprintf(stderr,"One PRL entry at a time.\n"); 535 exit(-1); 536 } 537 argc--; argv++; 538 } 539 if (devname == 0) { 540 fprintf(stderr, "Must specify dev.\n"); 541 exit(-1); 542 } 543 544 return tnl_prl_ioctl(cmd, medium, &p); 545} 546 547static int do_6rd(int argc, char **argv) 548{ 549 struct ip_tunnel_6rd ip6rd; 550 int devname = 0; 551 int cmd = 0; 552 char medium[IFNAMSIZ]; 553 inet_prefix prefix; 554 555 memset(&ip6rd, 0, sizeof(ip6rd)); 556 memset(&medium, 0, sizeof(medium)); 557 558 while (argc > 0) { 559 if (strcmp(*argv, "6rd-prefix") == 0) { 560 NEXT_ARG(); 561 if (get_prefix(&prefix, *argv, AF_INET6)) 562 invarg("invalid 6rd_prefix\n", *argv); 563 cmd = SIOCADD6RD; 564 memcpy(&ip6rd.prefix, prefix.data, 16); 565 ip6rd.prefixlen = prefix.bitlen; 566 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) { 567 NEXT_ARG(); 568 if (get_prefix(&prefix, *argv, AF_INET)) 569 invarg("invalid 6rd-relay_prefix\n", *argv); 570 cmd = SIOCADD6RD; 571 memcpy(&ip6rd.relay_prefix, prefix.data, 4); 572 ip6rd.relay_prefixlen = prefix.bitlen; 573 } else if (strcmp(*argv, "6rd-reset") == 0) { 574 cmd = SIOCDEL6RD; 575 } else if (strcmp(*argv, "dev") == 0) { 576 NEXT_ARG(); 577 strncpy(medium, *argv, IFNAMSIZ-1); 578 devname++; 579 } else { 580 fprintf(stderr,"%s: Invalid 6RD parameter.\n", *argv); 581 exit(-1); 582 } 583 argc--; argv++; 584 } 585 if (devname == 0) { 586 fprintf(stderr, "Must specify dev.\n"); 587 exit(-1); 588 } 589 590 return tnl_6rd_ioctl(cmd, medium, &ip6rd); 591} 592 593int do_iptunnel(int argc, char **argv) 594{ 595 switch (preferred_family) { 596 case AF_UNSPEC: 597 preferred_family = AF_INET; 598 break; 599 case AF_INET: 600 break; 601 /* 602 * This is silly enough but we have no easy way to make it 603 * protocol-independent because of unarranged structure between 604 * IPv4 and IPv6. 605 */ 606 case AF_INET6: 607 return do_ip6tunnel(argc, argv); 608 default: 609 fprintf(stderr, "Unsupported family:%d\n", preferred_family); 610 exit(-1); 611 } 612 613 if (argc > 0) { 614 if (matches(*argv, "add") == 0) 615 return do_add(SIOCADDTUNNEL, argc-1, argv+1); 616 if (matches(*argv, "change") == 0) 617 return do_add(SIOCCHGTUNNEL, argc-1, argv+1); 618 if (matches(*argv, "del") == 0) 619 return do_del(argc-1, argv+1); 620 if (matches(*argv, "show") == 0 || 621 matches(*argv, "lst") == 0 || 622 matches(*argv, "list") == 0) 623 return do_show(argc-1, argv+1); 624 if (matches(*argv, "prl") == 0) 625 return do_prl(argc-1, argv+1); 626 if (matches(*argv, "6rd") == 0) 627 return do_6rd(argc-1, argv+1); 628 if (matches(*argv, "help") == 0) 629 usage(); 630 } else 631 return do_show(0, NULL); 632 633 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv); 634 exit(-1); 635} 636