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
31 static void usage(void) __attribute__((noreturn));
32
usage(void)33 static 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
parse_args(int argc,char ** argv,int cmd,struct ip_tunnel_parm * p)50 static 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
do_add(int cmd,int argc,char ** argv)258 static 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
do_del(int argc,char ** argv)284 static 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
print_tunnel(struct ip_tunnel_parm * p)304 static 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
do_tunnels_list(struct ip_tunnel_parm * p)398 static 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
do_show(int argc,char ** argv)467 static 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
do_prl(int argc,char ** argv)497 static 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
do_6rd(int argc,char ** argv)547 static 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
do_iptunnel(int argc,char ** argv)593 int 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