1 /*
2 * Copyright (C)2006 USAGI/WIDE Project
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses>.
16 */
17 /*
18 * Author:
19 * Masahide NAKAMURA @USAGI
20 */
21
22 #include <stdio.h>
23 #include <string.h>
24 #include <stdlib.h>
25 #include <unistd.h>
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <arpa/inet.h>
29 #include <sys/ioctl.h>
30 #include <linux/ip.h>
31 #include <linux/if.h>
32 #include <linux/if_arp.h>
33 #include <linux/if_tunnel.h>
34 #include <linux/ip6_tunnel.h>
35
36 #include "utils.h"
37 #include "tunnel.h"
38 #include "ip_common.h"
39
40 #define IP6_FLOWINFO_TCLASS htonl(0x0FF00000)
41 #define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF)
42
43 #define DEFAULT_TNL_HOP_LIMIT (64)
44
45 static void usage(void) __attribute__((noreturn));
46
usage(void)47 static void usage(void)
48 {
49 fprintf(stderr, "Usage: ip -f inet6 tunnel { add | change | del | show } [ NAME ]\n");
50 fprintf(stderr, " [ mode { ip6ip6 | ipip6 | ip6gre | vti6 | any } ]\n");
51 fprintf(stderr, " [ remote ADDR local ADDR ] [ dev PHYS_DEV ]\n");
52 fprintf(stderr, " [ encaplimit ELIM ]\n");
53 fprintf(stderr, " [ hoplimit TTL ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n");
54 fprintf(stderr, " [ dscp inherit ]\n");
55 fprintf(stderr, " [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]\n");
56 fprintf(stderr, "\n");
57 fprintf(stderr, "Where: NAME := STRING\n");
58 fprintf(stderr, " ADDR := IPV6_ADDRESS\n");
59 fprintf(stderr, " ELIM := { none | 0..255 }(default=%d)\n",
60 IPV6_DEFAULT_TNL_ENCAP_LIMIT);
61 fprintf(stderr, " TTL := 0..255 (default=%d)\n",
62 DEFAULT_TNL_HOP_LIMIT);
63 fprintf(stderr, " TCLASS := { 0x0..0xff | inherit }\n");
64 fprintf(stderr, " FLOWLABEL := { 0x0..0xfffff | inherit }\n");
65 fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
66 exit(-1);
67 }
68
print_tunnel(struct ip6_tnl_parm2 * p)69 static void print_tunnel(struct ip6_tnl_parm2 *p)
70 {
71 char s1[1024];
72 char s2[1024];
73
74 /* Do not use format_host() for local addr,
75 * symbolic name will not be useful.
76 */
77 printf("%s: %s/ipv6 remote %s local %s",
78 p->name,
79 tnl_strproto(p->proto),
80 format_host_r(AF_INET6, 16, &p->raddr, s1, sizeof(s1)),
81 rt_addr_n2a_r(AF_INET6, 16, &p->laddr, s2, sizeof(s2)));
82 if (p->link) {
83 const char *n = ll_index_to_name(p->link);
84
85 if (n)
86 printf(" dev %s", n);
87 }
88
89 if (p->flags & IP6_TNL_F_IGN_ENCAP_LIMIT)
90 printf(" encaplimit none");
91 else
92 printf(" encaplimit %u", p->encap_limit);
93
94 printf(" hoplimit %u", p->hop_limit);
95
96 if (p->flags & IP6_TNL_F_USE_ORIG_TCLASS)
97 printf(" tclass inherit");
98 else {
99 __u32 val = ntohl(p->flowinfo & IP6_FLOWINFO_TCLASS);
100
101 printf(" tclass 0x%02x", (__u8)(val >> 20));
102 }
103
104 if (p->flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
105 printf(" flowlabel inherit");
106 else
107 printf(" flowlabel 0x%05x", ntohl(p->flowinfo & IP6_FLOWINFO_FLOWLABEL));
108
109 printf(" (flowinfo 0x%08x)", ntohl(p->flowinfo));
110
111 if (p->flags & IP6_TNL_F_RCV_DSCP_COPY)
112 printf(" dscp inherit");
113
114 if ((p->i_flags & GRE_KEY) && (p->o_flags & GRE_KEY) &&
115 p->o_key == p->i_key)
116 printf(" key %u", ntohl(p->i_key));
117 else {
118 if (p->i_flags & GRE_KEY)
119 printf(" ikey %u", ntohl(p->i_key));
120 if (p->o_flags & GRE_KEY)
121 printf(" okey %u", ntohl(p->o_key));
122 }
123
124 if (p->proto == IPPROTO_GRE) {
125 if (p->i_flags & GRE_SEQ)
126 printf("%s Drop packets out of sequence.", _SL_);
127 if (p->i_flags & GRE_CSUM)
128 printf("%s Checksum in received packet is required.", _SL_);
129 if (p->o_flags & GRE_SEQ)
130 printf("%s Sequence packets on output.", _SL_);
131 if (p->o_flags & GRE_CSUM)
132 printf("%s Checksum output packets.", _SL_);
133 }
134 }
135
parse_args(int argc,char ** argv,int cmd,struct ip6_tnl_parm2 * p)136 static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm2 *p)
137 {
138 int count = 0;
139 const char *medium = NULL;
140
141 while (argc > 0) {
142 if (strcmp(*argv, "mode") == 0) {
143 NEXT_ARG();
144 if (strcmp(*argv, "ipv6/ipv6") == 0 ||
145 strcmp(*argv, "ip6ip6") == 0)
146 p->proto = IPPROTO_IPV6;
147 else if (strcmp(*argv, "vti6") == 0) {
148 p->proto = IPPROTO_IPV6;
149 p->i_flags |= VTI_ISVTI;
150 } else if (strcmp(*argv, "ip/ipv6") == 0 ||
151 strcmp(*argv, "ipv4/ipv6") == 0 ||
152 strcmp(*argv, "ipip6") == 0 ||
153 strcmp(*argv, "ip4ip6") == 0)
154 p->proto = IPPROTO_IPIP;
155 else if (strcmp(*argv, "ip6gre") == 0 ||
156 strcmp(*argv, "gre/ipv6") == 0)
157 p->proto = IPPROTO_GRE;
158 else if (strcmp(*argv, "any/ipv6") == 0 ||
159 strcmp(*argv, "any") == 0)
160 p->proto = 0;
161 else {
162 fprintf(stderr, "Unknown tunnel mode \"%s\"\n", *argv);
163 exit(-1);
164 }
165 } else if (strcmp(*argv, "remote") == 0) {
166 inet_prefix raddr;
167
168 NEXT_ARG();
169 get_prefix(&raddr, *argv, preferred_family);
170 if (raddr.family == AF_UNSPEC)
171 invarg("\"remote\" address family is AF_UNSPEC", *argv);
172 memcpy(&p->raddr, &raddr.data, sizeof(p->raddr));
173 } else if (strcmp(*argv, "local") == 0) {
174 inet_prefix laddr;
175
176 NEXT_ARG();
177 get_prefix(&laddr, *argv, preferred_family);
178 if (laddr.family == AF_UNSPEC)
179 invarg("\"local\" address family is AF_UNSPEC", *argv);
180 memcpy(&p->laddr, &laddr.data, sizeof(p->laddr));
181 } else if (strcmp(*argv, "dev") == 0) {
182 NEXT_ARG();
183 medium = *argv;
184 } else if (strcmp(*argv, "encaplimit") == 0) {
185 NEXT_ARG();
186 if (strcmp(*argv, "none") == 0) {
187 p->flags |= IP6_TNL_F_IGN_ENCAP_LIMIT;
188 } else {
189 __u8 uval;
190
191 if (get_u8(&uval, *argv, 0) < -1)
192 invarg("invalid ELIM", *argv);
193 p->encap_limit = uval;
194 p->flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT;
195 }
196 } else if (strcmp(*argv, "hoplimit") == 0 ||
197 strcmp(*argv, "ttl") == 0 ||
198 strcmp(*argv, "hlim") == 0) {
199 __u8 uval;
200
201 NEXT_ARG();
202 if (get_u8(&uval, *argv, 0))
203 invarg("invalid TTL", *argv);
204 p->hop_limit = uval;
205 } else if (strcmp(*argv, "tclass") == 0 ||
206 strcmp(*argv, "tc") == 0 ||
207 strcmp(*argv, "tos") == 0 ||
208 matches(*argv, "dsfield") == 0) {
209 __u8 uval;
210
211 NEXT_ARG();
212 p->flowinfo &= ~IP6_FLOWINFO_TCLASS;
213 if (strcmp(*argv, "inherit") == 0)
214 p->flags |= IP6_TNL_F_USE_ORIG_TCLASS;
215 else {
216 if (get_u8(&uval, *argv, 16))
217 invarg("invalid TClass", *argv);
218 p->flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS;
219 p->flags &= ~IP6_TNL_F_USE_ORIG_TCLASS;
220 }
221 } else if (strcmp(*argv, "flowlabel") == 0 ||
222 strcmp(*argv, "fl") == 0) {
223 __u32 uval;
224
225 NEXT_ARG();
226 p->flowinfo &= ~IP6_FLOWINFO_FLOWLABEL;
227 if (strcmp(*argv, "inherit") == 0)
228 p->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL;
229 else {
230 if (get_u32(&uval, *argv, 16))
231 invarg("invalid Flowlabel", *argv);
232 if (uval > 0xFFFFF)
233 invarg("invalid Flowlabel", *argv);
234 p->flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL;
235 p->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL;
236 }
237 } else if (strcmp(*argv, "dscp") == 0) {
238 NEXT_ARG();
239 if (strcmp(*argv, "inherit") != 0)
240 invarg("not inherit", *argv);
241 p->flags |= IP6_TNL_F_RCV_DSCP_COPY;
242 } else if (strcmp(*argv, "key") == 0) {
243 NEXT_ARG();
244 p->i_flags |= GRE_KEY;
245 p->o_flags |= GRE_KEY;
246 p->i_key = p->o_key = tnl_parse_key("key", *argv);
247 } else if (strcmp(*argv, "ikey") == 0) {
248 NEXT_ARG();
249 p->i_flags |= GRE_KEY;
250 p->i_key = tnl_parse_key("ikey", *argv);
251 } else if (strcmp(*argv, "okey") == 0) {
252 NEXT_ARG();
253 p->o_flags |= GRE_KEY;
254 p->o_key = tnl_parse_key("okey", *argv);
255 } else if (strcmp(*argv, "seq") == 0) {
256 p->i_flags |= GRE_SEQ;
257 p->o_flags |= GRE_SEQ;
258 } else if (strcmp(*argv, "iseq") == 0) {
259 p->i_flags |= GRE_SEQ;
260 } else if (strcmp(*argv, "oseq") == 0) {
261 p->o_flags |= GRE_SEQ;
262 } else if (strcmp(*argv, "csum") == 0) {
263 p->i_flags |= GRE_CSUM;
264 p->o_flags |= GRE_CSUM;
265 } else if (strcmp(*argv, "icsum") == 0) {
266 p->i_flags |= GRE_CSUM;
267 } else if (strcmp(*argv, "ocsum") == 0) {
268 p->o_flags |= GRE_CSUM;
269 } else {
270 if (strcmp(*argv, "name") == 0) {
271 NEXT_ARG();
272 } else if (matches(*argv, "help") == 0)
273 usage();
274 if (p->name[0])
275 duparg2("name", *argv);
276 if (get_ifname(p->name, *argv))
277 invarg("\"name\" not a valid ifname", *argv);
278 if (cmd == SIOCCHGTUNNEL && count == 0) {
279 struct ip6_tnl_parm2 old_p = {};
280
281 if (tnl_get_ioctl(*argv, &old_p))
282 return -1;
283 *p = old_p;
284 }
285 }
286 count++;
287 argc--; argv++;
288 }
289 if (medium) {
290 p->link = ll_name_to_index(medium);
291 if (p->link == 0) {
292 fprintf(stderr, "Cannot find device \"%s\"\n", medium);
293 return -1;
294 }
295 }
296 return 0;
297 }
298
ip6_tnl_parm_init(struct ip6_tnl_parm2 * p,int apply_default)299 static void ip6_tnl_parm_init(struct ip6_tnl_parm2 *p, int apply_default)
300 {
301 memset(p, 0, sizeof(*p));
302 p->proto = IPPROTO_IPV6;
303 if (apply_default) {
304 p->hop_limit = DEFAULT_TNL_HOP_LIMIT;
305 p->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT;
306 }
307 }
308
309 /*
310 * @p1: user specified parameter
311 * @p2: database entry
312 */
ip6_tnl_parm_match(const struct ip6_tnl_parm2 * p1,const struct ip6_tnl_parm2 * p2)313 static int ip6_tnl_parm_match(const struct ip6_tnl_parm2 *p1,
314 const struct ip6_tnl_parm2 *p2)
315 {
316 return ((!p1->link || p1->link == p2->link) &&
317 (!p1->name[0] || strcmp(p1->name, p2->name) == 0) &&
318 (IN6_IS_ADDR_UNSPECIFIED(&p1->laddr) ||
319 IN6_ARE_ADDR_EQUAL(&p1->laddr, &p2->laddr)) &&
320 (IN6_IS_ADDR_UNSPECIFIED(&p1->raddr) ||
321 IN6_ARE_ADDR_EQUAL(&p1->raddr, &p2->raddr)) &&
322 (!p1->proto || !p2->proto || p1->proto == p2->proto) &&
323 (!p1->encap_limit || p1->encap_limit == p2->encap_limit) &&
324 (!p1->hop_limit || p1->hop_limit == p2->hop_limit) &&
325 (!(p1->flowinfo & IP6_FLOWINFO_TCLASS) ||
326 !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_TCLASS)) &&
327 (!(p1->flowinfo & IP6_FLOWINFO_FLOWLABEL) ||
328 !((p1->flowinfo ^ p2->flowinfo) & IP6_FLOWINFO_FLOWLABEL)) &&
329 (!p1->flags || (p1->flags & p2->flags)));
330 }
331
do_tunnels_list(struct ip6_tnl_parm2 * p)332 static int do_tunnels_list(struct ip6_tnl_parm2 *p)
333 {
334 char buf[512];
335 int err = -1;
336 FILE *fp = fopen("/proc/net/dev", "r");
337
338 if (fp == NULL) {
339 perror("fopen");
340 return -1;
341 }
342
343 /* skip two lines at the begenning of the file */
344 if (!fgets(buf, sizeof(buf), fp) ||
345 !fgets(buf, sizeof(buf), fp)) {
346 fprintf(stderr, "/proc/net/dev read error\n");
347 goto end;
348 }
349
350 while (fgets(buf, sizeof(buf), fp) != NULL) {
351 char name[IFNAMSIZ];
352 int index, type;
353 struct ip6_tnl_parm2 p1 = {};
354 char *ptr;
355
356 buf[sizeof(buf) - 1] = '\0';
357 if ((ptr = strchr(buf, ':')) == NULL ||
358 (*ptr++ = 0, sscanf(buf, "%s", name) != 1)) {
359 fprintf(stderr, "Wrong format for /proc/net/dev. Giving up.\n");
360 goto end;
361 }
362 if (p->name[0] && strcmp(p->name, name))
363 continue;
364 index = ll_name_to_index(name);
365 if (index == 0)
366 continue;
367 type = ll_index_to_type(index);
368 if (type == -1) {
369 fprintf(stderr, "Failed to get type of \"%s\"\n", name);
370 continue;
371 }
372 if (type != ARPHRD_TUNNEL6 && type != ARPHRD_IP6GRE)
373 continue;
374 ip6_tnl_parm_init(&p1, 0);
375 if (type == ARPHRD_IP6GRE)
376 p1.proto = IPPROTO_GRE;
377 strcpy(p1.name, name);
378 p1.link = ll_name_to_index(p1.name);
379 if (p1.link == 0)
380 continue;
381 if (tnl_get_ioctl(p1.name, &p1))
382 continue;
383 if (!ip6_tnl_parm_match(p, &p1))
384 continue;
385 print_tunnel(&p1);
386 if (show_stats)
387 tnl_print_stats(ptr);
388 printf("\n");
389 }
390 err = 0;
391 end:
392 fclose(fp);
393 return err;
394 }
395
do_show(int argc,char ** argv)396 static int do_show(int argc, char **argv)
397 {
398 struct ip6_tnl_parm2 p;
399
400 ll_init_map(&rth);
401 ip6_tnl_parm_init(&p, 0);
402 p.proto = 0; /* default to any */
403
404 if (parse_args(argc, argv, SIOCGETTUNNEL, &p) < 0)
405 return -1;
406
407 if (!p.name[0] || show_stats)
408 do_tunnels_list(&p);
409 else {
410 if (tnl_get_ioctl(p.name, &p))
411 return -1;
412 print_tunnel(&p);
413 printf("\n");
414 }
415
416 return 0;
417 }
418
do_add(int cmd,int argc,char ** argv)419 static int do_add(int cmd, int argc, char **argv)
420 {
421 struct ip6_tnl_parm2 p;
422 const char *basedev = "ip6tnl0";
423
424 ip6_tnl_parm_init(&p, 1);
425
426 if (parse_args(argc, argv, cmd, &p) < 0)
427 return -1;
428
429 if (p.proto == IPPROTO_GRE)
430 basedev = "ip6gre0";
431 else if (p.i_flags & VTI_ISVTI)
432 basedev = "ip6_vti0";
433
434 return tnl_add_ioctl(cmd, basedev, p.name, &p);
435 }
436
do_del(int argc,char ** argv)437 static int do_del(int argc, char **argv)
438 {
439 struct ip6_tnl_parm2 p;
440 const char *basedev = "ip6tnl0";
441
442 ip6_tnl_parm_init(&p, 1);
443
444 if (parse_args(argc, argv, SIOCDELTUNNEL, &p) < 0)
445 return -1;
446
447 if (p.proto == IPPROTO_GRE)
448 basedev = "ip6gre0";
449 else if (p.i_flags & VTI_ISVTI)
450 basedev = "ip6_vti0";
451
452 return tnl_del_ioctl(basedev, p.name, &p);
453 }
454
do_ip6tunnel(int argc,char ** argv)455 int do_ip6tunnel(int argc, char **argv)
456 {
457 switch (preferred_family) {
458 case AF_UNSPEC:
459 preferred_family = AF_INET6;
460 break;
461 case AF_INET6:
462 break;
463 default:
464 fprintf(stderr, "Unsupported protocol family: %d\n", preferred_family);
465 exit(-1);
466 }
467
468 if (argc > 0) {
469 if (matches(*argv, "add") == 0)
470 return do_add(SIOCADDTUNNEL, argc - 1, argv + 1);
471 if (matches(*argv, "change") == 0)
472 return do_add(SIOCCHGTUNNEL, argc - 1, argv + 1);
473 if (matches(*argv, "delete") == 0)
474 return do_del(argc - 1, argv + 1);
475 if (matches(*argv, "show") == 0 ||
476 matches(*argv, "lst") == 0 ||
477 matches(*argv, "list") == 0)
478 return do_show(argc - 1, argv + 1);
479 if (matches(*argv, "help") == 0)
480 usage();
481 } else
482 return do_show(0, NULL);
483
484 fprintf(stderr, "Command \"%s\" is unknown, try \"ip -f inet6 tunnel help\".\n", *argv);
485 exit(-1);
486 }
487