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 (at) 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 31 static void usage(void) __attribute__((noreturn)); 32 33 static void usage(void) 34 { 35 fprintf(stderr, "Usage: ip tunnel { add | change | del | show | prl } [ 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, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n"); 40 fprintf(stderr, "\n"); 41 fprintf(stderr, "Where: NAME := STRING\n"); 42 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n"); 43 fprintf(stderr, " TOS := { NUMBER | inherit }\n"); 44 fprintf(stderr, " TTL := { 1..255 | inherit }\n"); 45 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n"); 46 exit(-1); 47 } 48 49 static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p) 50 { 51 int count = 0; 52 char medium[IFNAMSIZ]; 53 int isatap = 0; 54 55 memset(p, 0, sizeof(*p)); 56 memset(&medium, 0, sizeof(medium)); 57 58 p->iph.version = 4; 59 p->iph.ihl = 5; 60 #ifndef IP_DF 61 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 62 #endif 63 p->iph.frag_off = htons(IP_DF); 64 65 while (argc > 0) { 66 if (strcmp(*argv, "mode") == 0) { 67 NEXT_ARG(); 68 if (strcmp(*argv, "ipip") == 0 || 69 strcmp(*argv, "ip/ip") == 0) { 70 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) { 71 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 72 exit(-1); 73 } 74 p->iph.protocol = IPPROTO_IPIP; 75 } else if (strcmp(*argv, "gre") == 0 || 76 strcmp(*argv, "gre/ip") == 0) { 77 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) { 78 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 79 exit(-1); 80 } 81 p->iph.protocol = IPPROTO_GRE; 82 } else if (strcmp(*argv, "sit") == 0 || 83 strcmp(*argv, "ipv6/ip") == 0) { 84 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) { 85 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n"); 86 exit(-1); 87 } 88 p->iph.protocol = IPPROTO_IPV6; 89 } else if (strcmp(*argv, "isatap") == 0) { 90 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) { 91 fprintf(stderr, "You managed to ask for more than one tunnel mode.\n"); 92 exit(-1); 93 } 94 p->iph.protocol = IPPROTO_IPV6; 95 isatap++; 96 } else { 97 fprintf(stderr,"Cannot guess tunnel mode.\n"); 98 exit(-1); 99 } 100 } else if (strcmp(*argv, "key") == 0) { 101 unsigned uval; 102 NEXT_ARG(); 103 p->i_flags |= GRE_KEY; 104 p->o_flags |= GRE_KEY; 105 if (strchr(*argv, '.')) 106 p->i_key = p->o_key = get_addr32(*argv); 107 else { 108 if (get_unsigned(&uval, *argv, 0)<0) { 109 fprintf(stderr, "invalid value of \"key\"\n"); 110 exit(-1); 111 } 112 p->i_key = p->o_key = htonl(uval); 113 } 114 } else if (strcmp(*argv, "ikey") == 0) { 115 unsigned uval; 116 NEXT_ARG(); 117 p->i_flags |= GRE_KEY; 118 if (strchr(*argv, '.')) 119 p->i_key = get_addr32(*argv); 120 else { 121 if (get_unsigned(&uval, *argv, 0)<0) { 122 fprintf(stderr, "invalid value of \"ikey\"\n"); 123 exit(-1); 124 } 125 p->i_key = htonl(uval); 126 } 127 } else if (strcmp(*argv, "okey") == 0) { 128 unsigned uval; 129 NEXT_ARG(); 130 p->o_flags |= GRE_KEY; 131 if (strchr(*argv, '.')) 132 p->o_key = get_addr32(*argv); 133 else { 134 if (get_unsigned(&uval, *argv, 0)<0) { 135 fprintf(stderr, "invalid value of \"okey\"\n"); 136 exit(-1); 137 } 138 p->o_key = htonl(uval); 139 } 140 } else if (strcmp(*argv, "seq") == 0) { 141 p->i_flags |= GRE_SEQ; 142 p->o_flags |= GRE_SEQ; 143 } else if (strcmp(*argv, "iseq") == 0) { 144 p->i_flags |= GRE_SEQ; 145 } else if (strcmp(*argv, "oseq") == 0) { 146 p->o_flags |= GRE_SEQ; 147 } else if (strcmp(*argv, "csum") == 0) { 148 p->i_flags |= GRE_CSUM; 149 p->o_flags |= GRE_CSUM; 150 } else if (strcmp(*argv, "icsum") == 0) { 151 p->i_flags |= GRE_CSUM; 152 } else if (strcmp(*argv, "ocsum") == 0) { 153 p->o_flags |= GRE_CSUM; 154 } else if (strcmp(*argv, "nopmtudisc") == 0) { 155 p->iph.frag_off = 0; 156 } else if (strcmp(*argv, "pmtudisc") == 0) { 157 p->iph.frag_off = htons(IP_DF); 158 } else if (strcmp(*argv, "remote") == 0) { 159 NEXT_ARG(); 160 if (strcmp(*argv, "any")) 161 p->iph.daddr = get_addr32(*argv); 162 } else if (strcmp(*argv, "local") == 0) { 163 NEXT_ARG(); 164 if (strcmp(*argv, "any")) 165 p->iph.saddr = get_addr32(*argv); 166 } else if (strcmp(*argv, "dev") == 0) { 167 NEXT_ARG(); 168 strncpy(medium, *argv, IFNAMSIZ-1); 169 } else if (strcmp(*argv, "ttl") == 0 || 170 strcmp(*argv, "hoplimit") == 0) { 171 unsigned uval; 172 NEXT_ARG(); 173 if (strcmp(*argv, "inherit") != 0) { 174 if (get_unsigned(&uval, *argv, 0)) 175 invarg("invalid TTL\n", *argv); 176 if (uval > 255) 177 invarg("TTL must be <=255\n", *argv); 178 p->iph.ttl = uval; 179 } 180 } else if (strcmp(*argv, "tos") == 0 || 181 strcmp(*argv, "tclass") == 0 || 182 matches(*argv, "dsfield") == 0) { 183 __u32 uval; 184 NEXT_ARG(); 185 if (strcmp(*argv, "inherit") != 0) { 186 if (rtnl_dsfield_a2n(&uval, *argv)) 187 invarg("bad TOS value", *argv); 188 p->iph.tos = uval; 189 } else 190 p->iph.tos = 1; 191 } else { 192 if (strcmp(*argv, "name") == 0) { 193 NEXT_ARG(); 194 } else if (matches(*argv, "help") == 0) 195 usage(); 196 if (p->name[0]) 197 duparg2("name", *argv); 198 strncpy(p->name, *argv, IFNAMSIZ); 199 if (cmd == SIOCCHGTUNNEL && count == 0) { 200 struct ip_tunnel_parm old_p; 201 memset(&old_p, 0, sizeof(old_p)); 202 if (tnl_get_ioctl(*argv, &old_p)) 203 return -1; 204 *p = old_p; 205 } 206 } 207 count++; 208 argc--; argv++; 209 } 210 211 212 if (p->iph.protocol == 0) { 213 if (memcmp(p->name, "gre", 3) == 0) 214 p->iph.protocol = IPPROTO_GRE; 215 else if (memcmp(p->name, "ipip", 4) == 0) 216 p->iph.protocol = IPPROTO_IPIP; 217 else if (memcmp(p->name, "sit", 3) == 0) 218 p->iph.protocol = IPPROTO_IPV6; 219 else if (memcmp(p->name, "isatap", 6) == 0) { 220 p->iph.protocol = IPPROTO_IPV6; 221 isatap++; 222 } 223 } 224 225 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) { 226 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) { 227 fprintf(stderr, "Keys are not allowed with ipip and sit.\n"); 228 return -1; 229 } 230 } 231 232 if (medium[0]) { 233 p->link = tnl_ioctl_get_ifindex(medium); 234 if (p->link == 0) 235 return -1; 236 } 237 238 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) { 239 p->i_key = p->iph.daddr; 240 p->i_flags |= GRE_KEY; 241 } 242 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) { 243 p->o_key = p->iph.daddr; 244 p->o_flags |= GRE_KEY; 245 } 246 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) { 247 fprintf(stderr, "Broadcast tunnel requires a source address.\n"); 248 return -1; 249 } 250 if (isatap) 251 p->i_flags |= SIT_ISATAP; 252 253 return 0; 254 } 255 256 257 static int do_add(int cmd, int argc, char **argv) 258 { 259 struct ip_tunnel_parm p; 260 261 if (parse_args(argc, argv, cmd, &p) < 0) 262 return -1; 263 264 if (p.iph.ttl && p.iph.frag_off == 0) { 265 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n"); 266 return -1; 267 } 268 269 switch (p.iph.protocol) { 270 case IPPROTO_IPIP: 271 return tnl_add_ioctl(cmd, "tunl0", p.name, &p); 272 case IPPROTO_GRE: 273 return tnl_add_ioctl(cmd, "gre0", p.name, &p); 274 case IPPROTO_IPV6: 275 return tnl_add_ioctl(cmd, "sit0", p.name, &p); 276 default: 277 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n"); 278 return -1; 279 } 280 return -1; 281 } 282 283 static int do_del(int argc, char **argv) 284 { 285 struct ip_tunnel_parm p; 286 287 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0) 288 return -1; 289 290 switch (p.iph.protocol) { 291 case IPPROTO_IPIP: 292 return tnl_del_ioctl("tunl0", p.name, &p); 293 case IPPROTO_GRE: 294 return tnl_del_ioctl("gre0", p.name, &p); 295 case IPPROTO_IPV6: 296 return tnl_del_ioctl("sit0", p.name, &p); 297 default: 298 return tnl_del_ioctl(p.name, p.name, &p); 299 } 300 return -1; 301 } 302 303 static void print_tunnel(struct ip_tunnel_parm *p) 304 { 305 char s1[1024]; 306 char s2[1024]; 307 char s3[64]; 308 char s4[64]; 309 310 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3)); 311 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4)); 312 313 /* Do not use format_host() for local addr, 314 * symbolic name will not be useful. 315 */ 316 printf("%s: %s/ip remote %s local %s ", 317 p->name, 318 tnl_strproto(p->iph.protocol), 319 p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any", 320 p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any"); 321 322 if (p->i_flags & SIT_ISATAP) { 323 struct ip_tunnel_prl prl[16]; 324 int i; 325 326 memset(prl, 0, sizeof(prl)); 327 prl[0].datalen = sizeof(prl) - sizeof(prl[0]); 328 prl[0].addr = htonl(INADDR_ANY); 329 330 if (!tnl_prl_ioctl(SIOCGETPRL, p->name, prl)) 331 for (i = 1; i < sizeof(prl) / sizeof(prl[0]); i++) 332 { 333 if (prl[i].addr != htonl(INADDR_ANY)) { 334 printf(" %s %s ", 335 (prl[i].flags & PRL_DEFAULT) ? "pdr" : "pr", 336 format_host(AF_INET, 4, &prl[i].addr, s1, sizeof(s1))); 337 } 338 } 339 } 340 341 if (p->link) { 342 char *n = tnl_ioctl_get_ifname(p->link); 343 if (n) 344 printf(" dev %s ", n); 345 } 346 347 if (p->iph.ttl) 348 printf(" ttl %d ", p->iph.ttl); 349 else 350 printf(" ttl inherit "); 351 352 if (p->iph.tos) { 353 SPRINT_BUF(b1); 354 printf(" tos"); 355 if (p->iph.tos&1) 356 printf(" inherit"); 357 if (p->iph.tos&~1) 358 printf("%c%s ", p->iph.tos&1 ? '/' : ' ', 359 rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1))); 360 } 361 362 if (!(p->iph.frag_off&htons(IP_DF))) 363 printf(" nopmtudisc"); 364 365 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key) 366 printf(" key %s", s3); 367 else if ((p->i_flags|p->o_flags)&GRE_KEY) { 368 if (p->i_flags&GRE_KEY) 369 printf(" ikey %s ", s3); 370 if (p->o_flags&GRE_KEY) 371 printf(" okey %s ", s4); 372 } 373 374 if (p->i_flags&GRE_SEQ) 375 printf("%s Drop packets out of sequence.\n", _SL_); 376 if (p->i_flags&GRE_CSUM) 377 printf("%s Checksum in received packet is required.", _SL_); 378 if (p->o_flags&GRE_SEQ) 379 printf("%s Sequence packets on output.", _SL_); 380 if (p->o_flags&GRE_CSUM) 381 printf("%s Checksum output packets.", _SL_); 382 } 383 384 static int do_tunnels_list(struct ip_tunnel_parm *p) 385 { 386 char name[IFNAMSIZ]; 387 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops, 388 rx_fifo, rx_frame, 389 tx_bytes, tx_packets, tx_errs, tx_drops, 390 tx_fifo, tx_colls, tx_carrier, rx_multi; 391 int type; 392 struct ip_tunnel_parm p1; 393 394 char buf[512]; 395 FILE *fp = fopen("/proc/net/dev", "r"); 396 if (fp == NULL) { 397 perror("fopen"); 398 return -1; 399 } 400 401 fgets(buf, sizeof(buf), fp); 402 fgets(buf, sizeof(buf), fp); 403 404 while (fgets(buf, sizeof(buf), fp) != NULL) { 405 char *ptr; 406 buf[sizeof(buf) - 1] = 0; 407 if ((ptr = strchr(buf, ':')) == NULL || 408 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) { 409 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n"); 410 return -1; 411 } 412 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld", 413 &rx_bytes, &rx_packets, &rx_errs, &rx_drops, 414 &rx_fifo, &rx_frame, &rx_multi, 415 &tx_bytes, &tx_packets, &tx_errs, &tx_drops, 416 &tx_fifo, &tx_colls, &tx_carrier) != 14) 417 continue; 418 if (p->name[0] && strcmp(p->name, name)) 419 continue; 420 type = tnl_ioctl_get_iftype(name); 421 if (type == -1) { 422 fprintf(stderr, "Failed to get type of [%s]\n", name); 423 continue; 424 } 425 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT) 426 continue; 427 memset(&p1, 0, sizeof(p1)); 428 if (tnl_get_ioctl(name, &p1)) 429 continue; 430 if ((p->link && p1.link != p->link) || 431 (p->name[0] && strcmp(p1.name, p->name)) || 432 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) || 433 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) || 434 (p->i_key && p1.i_key != p->i_key)) 435 continue; 436 print_tunnel(&p1); 437 if (show_stats) { 438 printf("%s", _SL_); 439 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_); 440 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s", 441 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_); 442 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_); 443 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld", 444 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops); 445 } 446 printf("\n"); 447 } 448 return 0; 449 } 450 451 static int do_show(int argc, char **argv) 452 { 453 int err; 454 struct ip_tunnel_parm p; 455 456 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0) 457 return -1; 458 459 switch (p.iph.protocol) { 460 case IPPROTO_IPIP: 461 err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p); 462 break; 463 case IPPROTO_GRE: 464 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p); 465 break; 466 case IPPROTO_IPV6: 467 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p); 468 break; 469 default: 470 do_tunnels_list(&p); 471 return 0; 472 } 473 if (err) 474 return -1; 475 476 print_tunnel(&p); 477 printf("\n"); 478 return 0; 479 } 480 481 static int do_prl(int argc, char **argv) 482 { 483 struct ip_tunnel_prl p; 484 int count = 0; 485 int devname = 0; 486 int cmd = 0; 487 char medium[IFNAMSIZ]; 488 489 memset(&p, 0, sizeof(p)); 490 memset(&medium, 0, sizeof(medium)); 491 492 while (argc > 0) { 493 if (strcmp(*argv, "prl-default") == 0) { 494 NEXT_ARG(); 495 cmd = SIOCADDPRL; 496 p.addr = get_addr32(*argv); 497 p.flags |= PRL_DEFAULT; 498 count++; 499 } else if (strcmp(*argv, "prl-nodefault") == 0) { 500 NEXT_ARG(); 501 cmd = SIOCADDPRL; 502 p.addr = get_addr32(*argv); 503 count++; 504 } else if (strcmp(*argv, "prl-delete") == 0) { 505 NEXT_ARG(); 506 cmd = SIOCDELPRL; 507 p.addr = get_addr32(*argv); 508 count++; 509 } else if (strcmp(*argv, "dev") == 0) { 510 NEXT_ARG(); 511 strncpy(medium, *argv, IFNAMSIZ-1); 512 devname++; 513 } else { 514 fprintf(stderr,"%s: Invalid PRL parameter.\n", *argv); 515 exit(-1); 516 } 517 if (count > 1) { 518 fprintf(stderr,"One PRL entry at a time.\n"); 519 exit(-1); 520 } 521 argc--; argv++; 522 } 523 if (devname == 0) { 524 fprintf(stderr, "Must specify dev.\n"); 525 exit(-1); 526 } 527 528 return tnl_prl_ioctl(cmd, medium, &p); 529 } 530 531 int do_iptunnel(int argc, char **argv) 532 { 533 switch (preferred_family) { 534 case AF_UNSPEC: 535 preferred_family = AF_INET; 536 break; 537 case AF_INET: 538 break; 539 /* 540 * This is silly enough but we have no easy way to make it 541 * protocol-independent because of unarranged structure between 542 * IPv4 and IPv6. 543 */ 544 case AF_INET6: 545 return do_ip6tunnel(argc, argv); 546 default: 547 fprintf(stderr, "Unsupported family:%d\n", preferred_family); 548 exit(-1); 549 } 550 551 if (argc > 0) { 552 if (matches(*argv, "add") == 0) 553 return do_add(SIOCADDTUNNEL, argc-1, argv+1); 554 if (matches(*argv, "change") == 0) 555 return do_add(SIOCCHGTUNNEL, argc-1, argv+1); 556 if (matches(*argv, "del") == 0) 557 return do_del(argc-1, argv+1); 558 if (matches(*argv, "show") == 0 || 559 matches(*argv, "lst") == 0 || 560 matches(*argv, "list") == 0) 561 return do_show(argc-1, argv+1); 562 if (matches(*argv, "prl") == 0) 563 return do_prl(argc-1, argv+1); 564 if (matches(*argv, "help") == 0) 565 usage(); 566 } else 567 return do_show(0, NULL); 568 569 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv); 570 exit(-1); 571 } 572
