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Allow he in tunnel name
[mirror_iproute2.git] / ip / 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 * Phil Karn <karn@ka9q.ampr.org> 990408: "pmtudisc" flag
17 */
18
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <arpa/inet.h>
26 #include <sys/ioctl.h>
27 #include <linux/if.h>
28 #include <linux/if_arp.h>
29 #include <linux/ip.h>
30 #include <linux/if_tunnel.h>
31
32 #include "rt_names.h"
33 #include "utils.h"
34 #include "ip_common.h"
35 #include "tunnel.h"
36
37 static void usage(void) __attribute__((noreturn));
38
39 static void usage(void)
40 {
41 fprintf(stderr, "Usage: ip tunnel { add | change | del | show } [ NAME ]\n");
42 fprintf(stderr, " [ mode { ipip | gre | sit | isatap } ] [ remote ADDR ] [ local ADDR ]\n");
43 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
44 fprintf(stderr, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
45 fprintf(stderr, "\n");
46 fprintf(stderr, "Where: NAME := STRING\n");
47 fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n");
48 fprintf(stderr, " TOS := { NUMBER | inherit }\n");
49 fprintf(stderr, " TTL := { 1..255 | inherit }\n");
50 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
51 exit(-1);
52 }
53
54 static int parse_args(int argc, char **argv, int cmd, struct ip_tunnel_parm *p)
55 {
56 int count = 0;
57 char medium[IFNAMSIZ];
58 int isatap = 0;
59
60 memset(p, 0, sizeof(*p));
61 memset(&medium, 0, sizeof(medium));
62
63 p->iph.version = 4;
64 p->iph.ihl = 5;
65 #ifndef IP_DF
66 #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
67 #endif
68 p->iph.frag_off = htons(IP_DF);
69
70 while (argc > 0) {
71 if (strcmp(*argv, "mode") == 0) {
72 NEXT_ARG();
73 if (strcmp(*argv, "ipip") == 0 ||
74 strcmp(*argv, "ip/ip") == 0) {
75 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPIP) {
76 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
77 exit(-1);
78 }
79 p->iph.protocol = IPPROTO_IPIP;
80 } else if (strcmp(*argv, "gre") == 0 ||
81 strcmp(*argv, "gre/ip") == 0) {
82 if (p->iph.protocol && p->iph.protocol != IPPROTO_GRE) {
83 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
84 exit(-1);
85 }
86 p->iph.protocol = IPPROTO_GRE;
87 } else if (strcmp(*argv, "sit") == 0 ||
88 strcmp(*argv, "ipv6/ip") == 0) {
89 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
90 fprintf(stderr,"You managed to ask for more than one tunnel mode.\n");
91 exit(-1);
92 }
93 p->iph.protocol = IPPROTO_IPV6;
94 } else if (strcmp(*argv, "isatap") == 0) {
95 if (p->iph.protocol && p->iph.protocol != IPPROTO_IPV6) {
96 fprintf(stderr, "You managed to ask for more than one tunnel mode.\n");
97 exit(-1);
98 }
99 p->iph.protocol = IPPROTO_IPV6;
100 isatap++;
101 } else {
102 fprintf(stderr,"Cannot guess tunnel mode.\n");
103 exit(-1);
104 }
105 } else if (strcmp(*argv, "key") == 0) {
106 unsigned uval;
107 NEXT_ARG();
108 p->i_flags |= GRE_KEY;
109 p->o_flags |= GRE_KEY;
110 if (strchr(*argv, '.'))
111 p->i_key = p->o_key = get_addr32(*argv);
112 else {
113 if (get_unsigned(&uval, *argv, 0)<0) {
114 fprintf(stderr, "invalid value of \"key\"\n");
115 exit(-1);
116 }
117 p->i_key = p->o_key = htonl(uval);
118 }
119 } else if (strcmp(*argv, "ikey") == 0) {
120 unsigned uval;
121 NEXT_ARG();
122 p->i_flags |= GRE_KEY;
123 if (strchr(*argv, '.'))
124 p->i_key = get_addr32(*argv);
125 else {
126 if (get_unsigned(&uval, *argv, 0)<0) {
127 fprintf(stderr, "invalid value of \"ikey\"\n");
128 exit(-1);
129 }
130 p->i_key = htonl(uval);
131 }
132 } else if (strcmp(*argv, "okey") == 0) {
133 unsigned uval;
134 NEXT_ARG();
135 p->o_flags |= GRE_KEY;
136 if (strchr(*argv, '.'))
137 p->o_key = get_addr32(*argv);
138 else {
139 if (get_unsigned(&uval, *argv, 0)<0) {
140 fprintf(stderr, "invalid value of \"okey\"\n");
141 exit(-1);
142 }
143 p->o_key = htonl(uval);
144 }
145 } else if (strcmp(*argv, "seq") == 0) {
146 p->i_flags |= GRE_SEQ;
147 p->o_flags |= GRE_SEQ;
148 } else if (strcmp(*argv, "iseq") == 0) {
149 p->i_flags |= GRE_SEQ;
150 } else if (strcmp(*argv, "oseq") == 0) {
151 p->o_flags |= GRE_SEQ;
152 } else if (strcmp(*argv, "csum") == 0) {
153 p->i_flags |= GRE_CSUM;
154 p->o_flags |= GRE_CSUM;
155 } else if (strcmp(*argv, "icsum") == 0) {
156 p->i_flags |= GRE_CSUM;
157 } else if (strcmp(*argv, "ocsum") == 0) {
158 p->o_flags |= GRE_CSUM;
159 } else if (strcmp(*argv, "nopmtudisc") == 0) {
160 p->iph.frag_off = 0;
161 } else if (strcmp(*argv, "pmtudisc") == 0) {
162 p->iph.frag_off = htons(IP_DF);
163 } else if (strcmp(*argv, "remote") == 0) {
164 NEXT_ARG();
165 if (strcmp(*argv, "any"))
166 p->iph.daddr = get_addr32(*argv);
167 } else if (strcmp(*argv, "local") == 0) {
168 NEXT_ARG();
169 if (strcmp(*argv, "any"))
170 p->iph.saddr = get_addr32(*argv);
171 } else if (strcmp(*argv, "dev") == 0) {
172 NEXT_ARG();
173 strncpy(medium, *argv, IFNAMSIZ-1);
174 } else if (strcmp(*argv, "ttl") == 0 ||
175 strcmp(*argv, "hoplimit") == 0) {
176 unsigned uval;
177 NEXT_ARG();
178 if (strcmp(*argv, "inherit") != 0) {
179 if (get_unsigned(&uval, *argv, 0))
180 invarg("invalid TTL\n", *argv);
181 if (uval > 255)
182 invarg("TTL must be <=255\n", *argv);
183 p->iph.ttl = uval;
184 }
185 } else if (strcmp(*argv, "tos") == 0 ||
186 strcmp(*argv, "tclass") == 0 ||
187 matches(*argv, "dsfield") == 0) {
188 __u32 uval;
189 NEXT_ARG();
190 if (strcmp(*argv, "inherit") != 0) {
191 if (rtnl_dsfield_a2n(&uval, *argv))
192 invarg("bad TOS value", *argv);
193 p->iph.tos = uval;
194 } else
195 p->iph.tos = 1;
196 } else {
197 if (strcmp(*argv, "name") == 0) {
198 NEXT_ARG();
199 } else if (matches(*argv, "help") == 0)
200 usage();
201 if (p->name[0])
202 duparg2("name", *argv);
203 strncpy(p->name, *argv, IFNAMSIZ);
204 if (cmd == SIOCCHGTUNNEL && count == 0) {
205 struct ip_tunnel_parm old_p;
206 memset(&old_p, 0, sizeof(old_p));
207 if (tnl_get_ioctl(*argv, &old_p))
208 return -1;
209 *p = old_p;
210 }
211 }
212 count++;
213 argc--; argv++;
214 }
215
216
217 if (p->iph.protocol == 0) {
218 if (memcmp(p->name, "gre", 3) == 0)
219 p->iph.protocol = IPPROTO_GRE;
220 else if (memcmp(p->name, "ipip", 4) == 0)
221 p->iph.protocol = IPPROTO_IPIP;
222 else if (memcmp(p->name, "sit", 3) == 0)
223 p->iph.protocol = IPPROTO_IPV6;
224 else if (memcmp(p->name, "isatap", 6) == 0) {
225 p->iph.protocol = IPPROTO_IPV6;
226 isatap++;
227 }
228 }
229
230 if (p->iph.protocol == IPPROTO_IPIP || p->iph.protocol == IPPROTO_IPV6) {
231 if ((p->i_flags & GRE_KEY) || (p->o_flags & GRE_KEY)) {
232 fprintf(stderr, "Keys are not allowed with ipip and sit.\n");
233 return -1;
234 }
235 }
236
237 if (medium[0]) {
238 p->link = tnl_ioctl_get_ifindex(medium);
239 if (p->link == 0)
240 return -1;
241 }
242
243 if (p->i_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
244 p->i_key = p->iph.daddr;
245 p->i_flags |= GRE_KEY;
246 }
247 if (p->o_key == 0 && IN_MULTICAST(ntohl(p->iph.daddr))) {
248 p->o_key = p->iph.daddr;
249 p->o_flags |= GRE_KEY;
250 }
251 if (IN_MULTICAST(ntohl(p->iph.daddr)) && !p->iph.saddr) {
252 fprintf(stderr, "Broadcast tunnel requires a source address.\n");
253 return -1;
254 }
255 if (isatap) {
256 if (p->iph.daddr) {
257 fprintf(stderr, "no remote with isatap.\n");
258 return -1;
259 }
260 p->i_flags |= SIT_ISATAP;
261 }
262
263 return 0;
264 }
265
266
267 static int do_add(int cmd, int argc, char **argv)
268 {
269 struct ip_tunnel_parm p;
270
271 if (parse_args(argc, argv, cmd, &p) < 0)
272 return -1;
273
274 if (p.iph.ttl && p.iph.frag_off == 0) {
275 fprintf(stderr, "ttl != 0 and noptmudisc are incompatible\n");
276 return -1;
277 }
278
279 switch (p.iph.protocol) {
280 case IPPROTO_IPIP:
281 return tnl_add_ioctl(cmd, "tunl0", p.name, &p);
282 case IPPROTO_GRE:
283 return tnl_add_ioctl(cmd, "gre0", p.name, &p);
284 case IPPROTO_IPV6:
285 return tnl_add_ioctl(cmd, "sit0", p.name, &p);
286 default:
287 fprintf(stderr, "cannot determine tunnel mode (ipip, gre or sit)\n");
288 return -1;
289 }
290 return -1;
291 }
292
293 static int do_del(int argc, char **argv)
294 {
295 struct ip_tunnel_parm p;
296
297 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
298 return -1;
299
300 switch (p.iph.protocol) {
301 case IPPROTO_IPIP:
302 return tnl_del_ioctl("tunl0", p.name, &p);
303 case IPPROTO_GRE:
304 return tnl_del_ioctl("gre0", p.name, &p);
305 case IPPROTO_IPV6:
306 return tnl_del_ioctl("sit0", p.name, &p);
307 default:
308 return tnl_del_ioctl(p.name, p.name, &p);
309 }
310 return -1;
311 }
312
313 static void print_tunnel(struct ip_tunnel_parm *p)
314 {
315 char s1[1024];
316 char s2[1024];
317 char s3[64];
318 char s4[64];
319
320 inet_ntop(AF_INET, &p->i_key, s3, sizeof(s3));
321 inet_ntop(AF_INET, &p->o_key, s4, sizeof(s4));
322
323 /* Do not use format_host() for local addr,
324 * symbolic name will not be useful.
325 */
326 printf("%s: %s/ip remote %s local %s ",
327 p->name,
328 tnl_strproto(p->iph.protocol),
329 p->iph.daddr ? format_host(AF_INET, 4, &p->iph.daddr, s1, sizeof(s1)) : "any",
330 p->iph.saddr ? rt_addr_n2a(AF_INET, 4, &p->iph.saddr, s2, sizeof(s2)) : "any");
331
332 if (p->link) {
333 char *n = tnl_ioctl_get_ifname(p->link);
334 if (n)
335 printf(" dev %s ", n);
336 }
337
338 if (p->iph.ttl)
339 printf(" ttl %d ", p->iph.ttl);
340 else
341 printf(" ttl inherit ");
342
343 if (p->iph.tos) {
344 SPRINT_BUF(b1);
345 printf(" tos");
346 if (p->iph.tos&1)
347 printf(" inherit");
348 if (p->iph.tos&~1)
349 printf("%c%s ", p->iph.tos&1 ? '/' : ' ',
350 rtnl_dsfield_n2a(p->iph.tos&~1, b1, sizeof(b1)));
351 }
352
353 if (!(p->iph.frag_off&htons(IP_DF)))
354 printf(" nopmtudisc");
355
356 if ((p->i_flags&GRE_KEY) && (p->o_flags&GRE_KEY) && p->o_key == p->i_key)
357 printf(" key %s", s3);
358 else if ((p->i_flags|p->o_flags)&GRE_KEY) {
359 if (p->i_flags&GRE_KEY)
360 printf(" ikey %s ", s3);
361 if (p->o_flags&GRE_KEY)
362 printf(" okey %s ", s4);
363 }
364
365 if (p->i_flags&GRE_SEQ)
366 printf("%s Drop packets out of sequence.\n", _SL_);
367 if (p->i_flags&GRE_CSUM)
368 printf("%s Checksum in received packet is required.", _SL_);
369 if (p->o_flags&GRE_SEQ)
370 printf("%s Sequence packets on output.", _SL_);
371 if (p->o_flags&GRE_CSUM)
372 printf("%s Checksum output packets.", _SL_);
373 }
374
375 static int do_tunnels_list(struct ip_tunnel_parm *p)
376 {
377 char name[IFNAMSIZ];
378 unsigned long rx_bytes, rx_packets, rx_errs, rx_drops,
379 rx_fifo, rx_frame,
380 tx_bytes, tx_packets, tx_errs, tx_drops,
381 tx_fifo, tx_colls, tx_carrier, rx_multi;
382 int type;
383 struct ip_tunnel_parm p1;
384
385 char buf[512];
386 FILE *fp = fopen("/proc/net/dev", "r");
387 if (fp == NULL) {
388 perror("fopen");
389 return -1;
390 }
391
392 fgets(buf, sizeof(buf), fp);
393 fgets(buf, sizeof(buf), fp);
394
395 while (fgets(buf, sizeof(buf), fp) != NULL) {
396 char *ptr;
397 buf[sizeof(buf) - 1] = 0;
398 if ((ptr = strchr(buf, ':')) == NULL ||
399 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
400 fprintf(stderr, "Wrong format of /proc/net/dev. Sorry.\n");
401 return -1;
402 }
403 if (sscanf(ptr, "%ld%ld%ld%ld%ld%ld%ld%*d%ld%ld%ld%ld%ld%ld%ld",
404 &rx_bytes, &rx_packets, &rx_errs, &rx_drops,
405 &rx_fifo, &rx_frame, &rx_multi,
406 &tx_bytes, &tx_packets, &tx_errs, &tx_drops,
407 &tx_fifo, &tx_colls, &tx_carrier) != 14)
408 continue;
409 if (p->name[0] && strcmp(p->name, name))
410 continue;
411 type = tnl_ioctl_get_iftype(name);
412 if (type == -1) {
413 fprintf(stderr, "Failed to get type of [%s]\n", name);
414 continue;
415 }
416 if (type != ARPHRD_TUNNEL && type != ARPHRD_IPGRE && type != ARPHRD_SIT)
417 continue;
418 memset(&p1, 0, sizeof(p1));
419 if (tnl_get_ioctl(name, &p1))
420 continue;
421 if ((p->link && p1.link != p->link) ||
422 (p->name[0] && strcmp(p1.name, p->name)) ||
423 (p->iph.daddr && p1.iph.daddr != p->iph.daddr) ||
424 (p->iph.saddr && p1.iph.saddr != p->iph.saddr) ||
425 (p->i_key && p1.i_key != p->i_key))
426 continue;
427 print_tunnel(&p1);
428 if (show_stats) {
429 printf("%s", _SL_);
430 printf("RX: Packets Bytes Errors CsumErrs OutOfSeq Mcasts%s", _SL_);
431 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-8ld%s",
432 rx_packets, rx_bytes, rx_errs, rx_frame, rx_fifo, rx_multi, _SL_);
433 printf("TX: Packets Bytes Errors DeadLoop NoRoute NoBufs%s", _SL_);
434 printf(" %-10ld %-12ld %-6ld %-8ld %-8ld %-6ld",
435 tx_packets, tx_bytes, tx_errs, tx_colls, tx_carrier, tx_drops);
436 }
437 printf("\n");
438 }
439 return 0;
440 }
441
442 static int do_show(int argc, char **argv)
443 {
444 int err;
445 struct ip_tunnel_parm p;
446
447 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
448 return -1;
449
450 switch (p.iph.protocol) {
451 case IPPROTO_IPIP:
452 err = tnl_get_ioctl(p.name[0] ? p.name : "tunl0", &p);
453 break;
454 case IPPROTO_GRE:
455 err = tnl_get_ioctl(p.name[0] ? p.name : "gre0", &p);
456 break;
457 case IPPROTO_IPV6:
458 err = tnl_get_ioctl(p.name[0] ? p.name : "sit0", &p);
459 break;
460 default:
461 do_tunnels_list(&p);
462 return 0;
463 }
464 if (err)
465 return -1;
466
467 print_tunnel(&p);
468 printf("\n");
469 return 0;
470 }
471
472 int do_iptunnel(int argc, char **argv)
473 {
474 switch (preferred_family) {
475 case AF_UNSPEC:
476 preferred_family = AF_INET;
477 break;
478 case AF_INET:
479 break;
480 /*
481 * This is silly enough but we have no easy way to make it
482 * protocol-independent because of unarranged structure between
483 * IPv4 and IPv6.
484 */
485 case AF_INET6:
486 return do_ip6tunnel(argc, argv);
487 default:
488 fprintf(stderr, "Unsupported family:%d\n", preferred_family);
489 exit(-1);
490 }
491
492 if (argc > 0) {
493 if (matches(*argv, "add") == 0)
494 return do_add(SIOCADDTUNNEL, argc-1, argv+1);
495 if (matches(*argv, "change") == 0)
496 return do_add(SIOCCHGTUNNEL, argc-1, argv+1);
497 if (matches(*argv, "del") == 0)
498 return do_del(argc-1, argv+1);
499 if (matches(*argv, "show") == 0 ||
500 matches(*argv, "lst") == 0 ||
501 matches(*argv, "list") == 0)
502 return do_show(argc-1, argv+1);
503 if (matches(*argv, "help") == 0)
504 usage();
505 } else
506 return do_show(0, NULL);
507
508 fprintf(stderr, "Command \"%s\" is unknown, try \"ip tunnel help\".\n", *argv);
509 exit(-1);
510 }
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