af_inet6.c revision 222711 
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
31static const char rcsid[] =
32  "$FreeBSD: head/sbin/ifconfig/af_inet6.c 222711 2011-06-05 11:37:20Z hrs $";
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
59static	struct in6_ifreq in6_ridreq;
60static	struct in6_aliasreq in6_addreq =
61  { .ifra_flags = 0,
62    .ifra_lifetime = { 0, 0, ND6_INFINITE_LIFETIME, ND6_INFINITE_LIFETIME } };
63static	int ip6lifetime;
64
65static	void in6_fillscopeid(struct sockaddr_in6 *sin6);
66static	int prefix(void *, int);
67static	char *sec2str(time_t);
68static	int explicit_prefix = 0;
69
70extern void setnd6flags(const char *, int, int, const struct afswtch *);
71extern void setnd6defif(const char *, int, int, const struct afswtch *);
72extern void nd6_status(int);
73
74static	char addr_buf[MAXHOSTNAMELEN *2 + 1];	/*for getnameinfo()*/
75
76static void
77setifprefixlen(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
85static void
86setip6flags(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
98static void
99setip6lifetime(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
120static void
121setip6pltime(const char *seconds, int dummy __unused, int s,
122    const struct afswtch *afp)
123{
124	setip6lifetime("pltime", seconds, s, afp);
125}
126
127static void
128setip6vltime(const char *seconds, int dummy __unused, int s,
129    const struct afswtch *afp)
130{
131	setip6lifetime("vltime", seconds, s, afp);
132}
133
134static void
135setip6eui64(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
168static void
169in6_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
180static void
181in6_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))
314static 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
319static void
320in6_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
341static void
342in6_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
375static int
376prefix(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
399static char *
400sec2str(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
432static void
433in6_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
444static void
445in6_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
476static void
477in6_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
491static 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("accept_rtadv",	ND6_IFF_ACCEPT_RTADV,	setnd6flags),
501	DEF_CMD("-accept_rtadv",-ND6_IFF_ACCEPT_RTADV,	setnd6flags),
502	DEF_CMD("defaultif",	1,			setnd6defif),
503	DEF_CMD("-defaultif",	-1,			setnd6defif),
504	DEF_CMD("ifdisabled",	ND6_IFF_IFDISABLED,	setnd6flags),
505	DEF_CMD("-ifdisabled",	-ND6_IFF_IFDISABLED,	setnd6flags),
506	DEF_CMD("nud",		ND6_IFF_PERFORMNUD,	setnd6flags),
507	DEF_CMD("-nud",		-ND6_IFF_PERFORMNUD,	setnd6flags),
508	DEF_CMD("prefer_source",ND6_IFF_PREFER_SOURCE,	setnd6flags),
509	DEF_CMD("-prefer_source",-ND6_IFF_PREFER_SOURCE,setnd6flags),
510	DEF_CMD("auto_linklocal",ND6_IFF_AUTO_LINKLOCAL,setnd6flags),
511	DEF_CMD("-auto_linklocal",-ND6_IFF_AUTO_LINKLOCAL,setnd6flags),
512	DEF_CMD_ARG("pltime",        			setip6pltime),
513	DEF_CMD_ARG("vltime",        			setip6vltime),
514	DEF_CMD("eui64",	0,			setip6eui64),
515};
516
517static struct afswtch af_inet6 = {
518	.af_name	= "inet6",
519	.af_af		= AF_INET6,
520	.af_status	= in6_status,
521	.af_getaddr	= in6_getaddr,
522	.af_getprefix	= in6_getprefix,
523	.af_other_status = nd6_status,
524	.af_postproc	= in6_postproc,
525	.af_status_tunnel = in6_status_tunnel,
526	.af_settunnel	= in6_set_tunnel,
527	.af_difaddr	= SIOCDIFADDR_IN6,
528	.af_aifaddr	= SIOCAIFADDR_IN6,
529	.af_ridreq	= &in6_addreq,
530	.af_addreq	= &in6_addreq,
531};
532
533static void
534in6_Lopt_cb(const char *optarg __unused)
535{
536	ip6lifetime++;	/* print IPv6 address lifetime */
537}
538static struct option in6_Lopt = { .opt = "L", .opt_usage = "[-L]", .cb = in6_Lopt_cb };
539
540static __constructor void
541inet6_ctor(void)
542{
543#define	N(a)	(sizeof(a) / sizeof(a[0]))
544	size_t i;
545
546	if (!feature_present("inet6"))
547		return;
548
549	for (i = 0; i < N(inet6_cmds);  i++)
550		cmd_register(&inet6_cmds[i]);
551	af_register(&af_inet6);
552	opt_register(&in6_Lopt);
553#undef N
554}
555