xref: /freebsd/sbin/ifconfig/af_inet6.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 1983, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #ifndef lint
31 static const char rcsid[] =
32   "$FreeBSD$";
33 #endif /* not lint */
34 
35 #include <sys/param.h>
36 #include <sys/ioctl.h>
37 #include <sys/socket.h>
38 #include <net/if.h>
39 
40 #include <err.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include <ifaddrs.h>
46 
47 #include <arpa/inet.h>
48 
49 #include <netinet/in.h>
50 #include <net/if_var.h>		/* for struct ifaddr */
51 #include <netinet/in_var.h>
52 #include <arpa/inet.h>
53 #include <netdb.h>
54 
55 #include <netinet6/nd6.h>	/* Define ND6_INFINITE_LIFETIME */
56 
57 #include "ifconfig.h"
58 
59 static	struct in6_ifreq in6_ridreq;
60 static	struct in6_aliasreq in6_addreq =
61   { { 0 },
62     { 0 },
63     { 0 },
64     { 0 },
65     0,
66     { 0, 0, ND6_INFINITE_LIFETIME, ND6_INFINITE_LIFETIME } };
67 static	int ip6lifetime;
68 
69 static	void in6_fillscopeid(struct sockaddr_in6 *sin6);
70 static	int prefix(void *, int);
71 static	char *sec2str(time_t);
72 static	int explicit_prefix = 0;
73 
74 static	char addr_buf[MAXHOSTNAMELEN *2 + 1];	/*for getnameinfo()*/
75 
76 static void
77 setifprefixlen(const char *addr, int dummy __unused, int s,
78     const struct afswtch *afp)
79 {
80         if (afp->af_getprefix != NULL)
81                 afp->af_getprefix(addr, MASK);
82 	explicit_prefix = 1;
83 }
84 
85 static void
86 setip6flags(const char *dummyaddr __unused, int flag, int dummysoc __unused,
87     const struct afswtch *afp)
88 {
89 	if (afp->af_af != AF_INET6)
90 		err(1, "address flags can be set only for inet6 addresses");
91 
92 	if (flag < 0)
93 		in6_addreq.ifra_flags &= ~(-flag);
94 	else
95 		in6_addreq.ifra_flags |= flag;
96 }
97 
98 static void
99 setip6lifetime(const char *cmd, const char *val, int s,
100     const struct afswtch *afp)
101 {
102 	time_t newval, t;
103 	char *ep;
104 
105 	t = time(NULL);
106 	newval = (time_t)strtoul(val, &ep, 0);
107 	if (val == ep)
108 		errx(1, "invalid %s", cmd);
109 	if (afp->af_af != AF_INET6)
110 		errx(1, "%s not allowed for the AF", cmd);
111 	if (strcmp(cmd, "vltime") == 0) {
112 		in6_addreq.ifra_lifetime.ia6t_expire = t + newval;
113 		in6_addreq.ifra_lifetime.ia6t_vltime = newval;
114 	} else if (strcmp(cmd, "pltime") == 0) {
115 		in6_addreq.ifra_lifetime.ia6t_preferred = t + newval;
116 		in6_addreq.ifra_lifetime.ia6t_pltime = newval;
117 	}
118 }
119 
120 static void
121 setip6pltime(const char *seconds, int dummy __unused, int s,
122     const struct afswtch *afp)
123 {
124 	setip6lifetime("pltime", seconds, s, afp);
125 }
126 
127 static void
128 setip6vltime(const char *seconds, int dummy __unused, int s,
129     const struct afswtch *afp)
130 {
131 	setip6lifetime("vltime", seconds, s, afp);
132 }
133 
134 static void
135 setip6eui64(const char *cmd, int dummy __unused, int s,
136     const struct afswtch *afp)
137 {
138 	struct ifaddrs *ifap, *ifa;
139 	const struct sockaddr_in6 *sin6 = NULL;
140 	const struct in6_addr *lladdr = NULL;
141 	struct in6_addr *in6;
142 
143 	if (afp->af_af != AF_INET6)
144 		errx(EXIT_FAILURE, "%s not allowed for the AF", cmd);
145  	in6 = (struct in6_addr *)&in6_addreq.ifra_addr.sin6_addr;
146 	if (memcmp(&in6addr_any.s6_addr[8], &in6->s6_addr[8], 8) != 0)
147 		errx(EXIT_FAILURE, "interface index is already filled");
148 	if (getifaddrs(&ifap) != 0)
149 		err(EXIT_FAILURE, "getifaddrs");
150 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
151 		if (ifa->ifa_addr->sa_family == AF_INET6 &&
152 		    strcmp(ifa->ifa_name, name) == 0) {
153 			sin6 = (const struct sockaddr_in6 *)ifa->ifa_addr;
154 			if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
155 				lladdr = &sin6->sin6_addr;
156 				break;
157 			}
158 		}
159 	}
160 	if (!lladdr)
161 		errx(EXIT_FAILURE, "could not determine link local address");
162 
163  	memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);
164 
165 	freeifaddrs(ifap);
166 }
167 
168 static void
169 in6_fillscopeid(struct sockaddr_in6 *sin6)
170 {
171 #if defined(__KAME__) && defined(KAME_SCOPEID)
172 	if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
173 		sin6->sin6_scope_id =
174 			ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
175 		sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
176 	}
177 #endif
178 }
179 
180 static void
181 in6_status(int s __unused, const struct ifaddrs *ifa)
182 {
183 	struct sockaddr_in6 *sin, null_sin;
184 	struct in6_ifreq ifr6;
185 	int s6;
186 	u_int32_t flags6;
187 	struct in6_addrlifetime lifetime;
188 	time_t t = time(NULL);
189 	int error;
190 	u_int32_t scopeid;
191 
192 	memset(&null_sin, 0, sizeof(null_sin));
193 
194 	sin = (struct sockaddr_in6 *)ifa->ifa_addr;
195 	if (sin == NULL)
196 		return;
197 
198 	strncpy(ifr6.ifr_name, ifr.ifr_name, sizeof(ifr.ifr_name));
199 	if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
200 		warn("socket(AF_INET6,SOCK_DGRAM)");
201 		return;
202 	}
203 	ifr6.ifr_addr = *sin;
204 	if (ioctl(s6, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
205 		warn("ioctl(SIOCGIFAFLAG_IN6)");
206 		close(s6);
207 		return;
208 	}
209 	flags6 = ifr6.ifr_ifru.ifru_flags6;
210 	memset(&lifetime, 0, sizeof(lifetime));
211 	ifr6.ifr_addr = *sin;
212 	if (ioctl(s6, SIOCGIFALIFETIME_IN6, &ifr6) < 0) {
213 		warn("ioctl(SIOCGIFALIFETIME_IN6)");
214 		close(s6);
215 		return;
216 	}
217 	lifetime = ifr6.ifr_ifru.ifru_lifetime;
218 	close(s6);
219 
220 	/* XXX: embedded link local addr check */
221 	if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) &&
222 	    *(u_short *)&sin->sin6_addr.s6_addr[2] != 0) {
223 		u_short index;
224 
225 		index = *(u_short *)&sin->sin6_addr.s6_addr[2];
226 		*(u_short *)&sin->sin6_addr.s6_addr[2] = 0;
227 		if (sin->sin6_scope_id == 0)
228 			sin->sin6_scope_id = ntohs(index);
229 	}
230 	scopeid = sin->sin6_scope_id;
231 
232 	error = getnameinfo((struct sockaddr *)sin, sin->sin6_len, addr_buf,
233 			    sizeof(addr_buf), NULL, 0, NI_NUMERICHOST);
234 	if (error != 0)
235 		inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
236 			  sizeof(addr_buf));
237 	printf("\tinet6 %s ", addr_buf);
238 
239 	if (ifa->ifa_flags & IFF_POINTOPOINT) {
240 		sin = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
241 		/*
242 		 * some of the interfaces do not have valid destination
243 		 * address.
244 		 */
245 		if (sin != NULL && sin->sin6_family == AF_INET6) {
246 			int error;
247 
248 			/* XXX: embedded link local addr check */
249 			if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr) &&
250 			    *(u_short *)&sin->sin6_addr.s6_addr[2] != 0) {
251 				u_short index;
252 
253 				index = *(u_short *)&sin->sin6_addr.s6_addr[2];
254 				*(u_short *)&sin->sin6_addr.s6_addr[2] = 0;
255 				if (sin->sin6_scope_id == 0)
256 					sin->sin6_scope_id = ntohs(index);
257 			}
258 
259 			error = getnameinfo((struct sockaddr *)sin,
260 					    sin->sin6_len, addr_buf,
261 					    sizeof(addr_buf), NULL, 0,
262 					    NI_NUMERICHOST);
263 			if (error != 0)
264 				inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
265 					  sizeof(addr_buf));
266 			printf("--> %s ", addr_buf);
267 		}
268 	}
269 
270 	sin = (struct sockaddr_in6 *)ifa->ifa_netmask;
271 	if (sin == NULL)
272 		sin = &null_sin;
273 	printf("prefixlen %d ", prefix(&sin->sin6_addr,
274 		sizeof(struct in6_addr)));
275 
276 	if ((flags6 & IN6_IFF_ANYCAST) != 0)
277 		printf("anycast ");
278 	if ((flags6 & IN6_IFF_TENTATIVE) != 0)
279 		printf("tentative ");
280 	if ((flags6 & IN6_IFF_DUPLICATED) != 0)
281 		printf("duplicated ");
282 	if ((flags6 & IN6_IFF_DETACHED) != 0)
283 		printf("detached ");
284 	if ((flags6 & IN6_IFF_DEPRECATED) != 0)
285 		printf("deprecated ");
286 	if ((flags6 & IN6_IFF_AUTOCONF) != 0)
287 		printf("autoconf ");
288 	if ((flags6 & IN6_IFF_TEMPORARY) != 0)
289 		printf("temporary ");
290 
291         if (scopeid)
292 		printf("scopeid 0x%x ", scopeid);
293 
294 	if (ip6lifetime && (lifetime.ia6t_preferred || lifetime.ia6t_expire)) {
295 		printf("pltime ");
296 		if (lifetime.ia6t_preferred) {
297 			printf("%s ", lifetime.ia6t_preferred < t
298 				? "0" : sec2str(lifetime.ia6t_preferred - t));
299 		} else
300 			printf("infty ");
301 
302 		printf("vltime ");
303 		if (lifetime.ia6t_expire) {
304 			printf("%s ", lifetime.ia6t_expire < t
305 				? "0" : sec2str(lifetime.ia6t_expire - t));
306 		} else
307 			printf("infty ");
308 	}
309 
310 	putchar('\n');
311 }
312 
313 #define	SIN6(x) ((struct sockaddr_in6 *) &(x))
314 static struct	sockaddr_in6 *sin6tab[] = {
315 	SIN6(in6_ridreq.ifr_addr), SIN6(in6_addreq.ifra_addr),
316 	SIN6(in6_addreq.ifra_prefixmask), SIN6(in6_addreq.ifra_dstaddr)
317 };
318 
319 static void
320 in6_getprefix(const char *plen, int which)
321 {
322 	struct sockaddr_in6 *sin = sin6tab[which];
323 	u_char *cp;
324 	int len = atoi(plen);
325 
326 	if ((len < 0) || (len > 128))
327 		errx(1, "%s: bad value", plen);
328 	sin->sin6_len = sizeof(*sin);
329 	if (which != MASK)
330 		sin->sin6_family = AF_INET6;
331 	if ((len == 0) || (len == 128)) {
332 		memset(&sin->sin6_addr, 0xff, sizeof(struct in6_addr));
333 		return;
334 	}
335 	memset((void *)&sin->sin6_addr, 0x00, sizeof(sin->sin6_addr));
336 	for (cp = (u_char *)&sin->sin6_addr; len > 7; len -= 8)
337 		*cp++ = 0xff;
338 	*cp = 0xff << (8 - len);
339 }
340 
341 static void
342 in6_getaddr(const char *s, int which)
343 {
344 	struct sockaddr_in6 *sin = sin6tab[which];
345 	struct addrinfo hints, *res;
346 	int error = -1;
347 
348 	newaddr &= 1;
349 
350 	sin->sin6_len = sizeof(*sin);
351 	if (which != MASK)
352 		sin->sin6_family = AF_INET6;
353 
354 	if (which == ADDR) {
355 		char *p = NULL;
356 		if((p = strrchr(s, '/')) != NULL) {
357 			*p = '\0';
358 			in6_getprefix(p + 1, MASK);
359 			explicit_prefix = 1;
360 		}
361 	}
362 
363 	if (sin->sin6_family == AF_INET6) {
364 		bzero(&hints, sizeof(struct addrinfo));
365 		hints.ai_family = AF_INET6;
366 		error = getaddrinfo(s, NULL, &hints, &res);
367 	}
368 	if (error != 0) {
369 		if (inet_pton(AF_INET6, s, &sin->sin6_addr) != 1)
370 			errx(1, "%s: bad value", s);
371 	} else
372 		bcopy(res->ai_addr, sin, res->ai_addrlen);
373 }
374 
375 static int
376 prefix(void *val, int size)
377 {
378         u_char *name = (u_char *)val;
379         int byte, bit, plen = 0;
380 
381         for (byte = 0; byte < size; byte++, plen += 8)
382                 if (name[byte] != 0xff)
383                         break;
384 	if (byte == size)
385 		return (plen);
386 	for (bit = 7; bit != 0; bit--, plen++)
387                 if (!(name[byte] & (1 << bit)))
388                         break;
389         for (; bit != 0; bit--)
390                 if (name[byte] & (1 << bit))
391                         return(0);
392         byte++;
393         for (; byte < size; byte++)
394                 if (name[byte])
395                         return(0);
396         return (plen);
397 }
398 
399 static char *
400 sec2str(time_t total)
401 {
402 	static char result[256];
403 	int days, hours, mins, secs;
404 	int first = 1;
405 	char *p = result;
406 
407 	if (0) {
408 		days = total / 3600 / 24;
409 		hours = (total / 3600) % 24;
410 		mins = (total / 60) % 60;
411 		secs = total % 60;
412 
413 		if (days) {
414 			first = 0;
415 			p += sprintf(p, "%dd", days);
416 		}
417 		if (!first || hours) {
418 			first = 0;
419 			p += sprintf(p, "%dh", hours);
420 		}
421 		if (!first || mins) {
422 			first = 0;
423 			p += sprintf(p, "%dm", mins);
424 		}
425 		sprintf(p, "%ds", secs);
426 	} else
427 		sprintf(result, "%lu", (unsigned long)total);
428 
429 	return(result);
430 }
431 
432 static void
433 in6_postproc(int s, const struct afswtch *afp)
434 {
435 	if (explicit_prefix == 0) {
436 		/* Aggregatable address architecture defines all prefixes
437 		   are 64. So, it is convenient to set prefixlen to 64 if
438 		   it is not specified. */
439 		setifprefixlen("64", 0, s, afp);
440 		/* in6_getprefix("64", MASK) if MASK is available here... */
441 	}
442 }
443 
444 static void
445 in6_status_tunnel(int s)
446 {
447 	char src[NI_MAXHOST];
448 	char dst[NI_MAXHOST];
449 	struct in6_ifreq in6_ifr;
450 	const struct sockaddr *sa = (const struct sockaddr *) &in6_ifr.ifr_addr;
451 
452 	memset(&in6_ifr, 0, sizeof(in6_ifr));
453 	strncpy(in6_ifr.ifr_name, name, IFNAMSIZ);
454 
455 	if (ioctl(s, SIOCGIFPSRCADDR_IN6, (caddr_t)&in6_ifr) < 0)
456 		return;
457 	if (sa->sa_family != AF_INET6)
458 		return;
459 	in6_fillscopeid(&in6_ifr.ifr_addr);
460 	if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0,
461 	    NI_NUMERICHOST) != 0)
462 		src[0] = '\0';
463 
464 	if (ioctl(s, SIOCGIFPDSTADDR_IN6, (caddr_t)&in6_ifr) < 0)
465 		return;
466 	if (sa->sa_family != AF_INET6)
467 		return;
468 	in6_fillscopeid(&in6_ifr.ifr_addr);
469 	if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0,
470 	    NI_NUMERICHOST) != 0)
471 		dst[0] = '\0';
472 
473 	printf("\ttunnel inet6 %s --> %s\n", src, dst);
474 }
475 
476 static void
477 in6_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
478 {
479 	struct in6_aliasreq in6_addreq;
480 
481 	memset(&in6_addreq, 0, sizeof(in6_addreq));
482 	strncpy(in6_addreq.ifra_name, name, IFNAMSIZ);
483 	memcpy(&in6_addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
484 	memcpy(&in6_addreq.ifra_dstaddr, dstres->ai_addr,
485 	    dstres->ai_addr->sa_len);
486 
487 	if (ioctl(s, SIOCSIFPHYADDR_IN6, &in6_addreq) < 0)
488 		warn("SIOCSIFPHYADDR_IN6");
489 }
490 
491 static struct cmd inet6_cmds[] = {
492 	DEF_CMD_ARG("prefixlen",			setifprefixlen),
493 	DEF_CMD("anycast",	IN6_IFF_ANYCAST,	setip6flags),
494 	DEF_CMD("tentative",	IN6_IFF_TENTATIVE,	setip6flags),
495 	DEF_CMD("-tentative",	-IN6_IFF_TENTATIVE,	setip6flags),
496 	DEF_CMD("deprecated",	IN6_IFF_DEPRECATED,	setip6flags),
497 	DEF_CMD("-deprecated", -IN6_IFF_DEPRECATED,	setip6flags),
498 	DEF_CMD("autoconf",	IN6_IFF_AUTOCONF,	setip6flags),
499 	DEF_CMD("-autoconf",	-IN6_IFF_AUTOCONF,	setip6flags),
500 	DEF_CMD_ARG("pltime",        			setip6pltime),
501 	DEF_CMD_ARG("vltime",        			setip6vltime),
502 	DEF_CMD("eui64",	0,			setip6eui64),
503 };
504 
505 static struct afswtch af_inet6 = {
506 	.af_name	= "inet6",
507 	.af_af		= AF_INET6,
508 	.af_status	= in6_status,
509 	.af_getaddr	= in6_getaddr,
510 	.af_getprefix	= in6_getprefix,
511 	.af_postproc	= in6_postproc,
512 	.af_status_tunnel = in6_status_tunnel,
513 	.af_settunnel	= in6_set_tunnel,
514 	.af_difaddr	= SIOCDIFADDR_IN6,
515 	.af_aifaddr	= SIOCAIFADDR_IN6,
516 	.af_ridreq	= &in6_addreq,
517 	.af_addreq	= &in6_addreq,
518 };
519 
520 static void
521 in6_Lopt_cb(const char *optarg __unused)
522 {
523 	ip6lifetime++;	/* print IPv6 address lifetime */
524 }
525 static struct option in6_Lopt = { "L", "[-L]", in6_Lopt_cb };
526 
527 static __constructor void
528 inet6_ctor(void)
529 {
530 #define	N(a)	(sizeof(a) / sizeof(a[0]))
531 	int i;
532 
533 	for (i = 0; i < N(inet6_cmds);  i++)
534 		cmd_register(&inet6_cmds[i]);
535 	af_register(&af_inet6);
536 	opt_register(&in6_Lopt);
537 #undef N
538 }
539