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af_inet6.c revision 1.20 
      1 /*	$NetBSD: af_inet6.c,v 1.20 2008/05/12 15:35:50 dyoung Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *      The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __RCSID("$NetBSD: af_inet6.c,v 1.20 2008/05/12 15:35:50 dyoung Exp $");
     35 #endif /* not lint */
     36 
     37 #include <sys/param.h>
     38 #include <sys/ioctl.h>
     39 #include <sys/socket.h>
     40 
     41 #include <net/if.h>
     42 #include <netinet/in.h>
     43 #include <netinet/in_var.h>
     44 #include <netinet6/nd6.h>
     45 
     46 #include <err.h>
     47 #include <errno.h>
     48 #include <ifaddrs.h>
     49 #include <netdb.h>
     50 #include <string.h>
     51 #include <stdlib.h>
     52 #include <stdio.h>
     53 #include <util.h>
     54 
     55 #include "env.h"
     56 #include "parse.h"
     57 #include "extern.h"
     58 #include "af_inet6.h"
     59 #include "af_inetany.h"
     60 
     61 struct in6_ifreq    in6_ridreq = {
     62 	.ifr_addr = {
     63 		.sin6_family = AF_INET6,
     64 		.sin6_addr = {
     65 			.s6_addr =
     66 			    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
     67 		}
     68 	}
     69 };
     70 
     71 struct in6_aliasreq in6_addreq = {
     72 	.ifra_prefixmask = {
     73 		.sin6_len = sizeof(in6_addreq.ifra_prefixmask),
     74 		.sin6_addr = {
     75 			.s6_addr =
     76 			    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}}},
     77 	.ifra_lifetime = {
     78 		  .ia6t_pltime = ND6_INFINITE_LIFETIME
     79 		, .ia6t_vltime = ND6_INFINITE_LIFETIME
     80 	}
     81 };
     82 
     83 static const struct kwinst ia6flagskw[] = {
     84 	  IFKW("anycast",	IN6_IFF_ANYCAST)
     85 	, IFKW("tentative",	IN6_IFF_TENTATIVE)
     86 	, IFKW("deprecated",	IN6_IFF_DEPRECATED)
     87 };
     88 
     89 static struct pinteger parse_pltime = PINTEGER_INITIALIZER(&parse_pltime,
     90     "pltime", 0, NULL, "pltime", &command_root.pb_parser);
     91 
     92 static struct pinteger parse_vltime = PINTEGER_INITIALIZER(&parse_vltime,
     93     "vltime", 0, NULL, "vltime", &command_root.pb_parser);
     94 
     95 static const struct kwinst inet6kw[] = {
     96 	  {.k_word = "pltime", .k_nextparser = &parse_pltime.pi_parser}
     97 	, {.k_word = "vltime", .k_nextparser = &parse_vltime.pi_parser}
     98 	, {.k_word = "eui64", .k_key = "eui64", .k_type = KW_T_BOOL,
     99 	   .k_bool = true, .k_nextparser = &command_root.pb_parser}
    100 };
    101 
    102 struct pkw ia6flags = PKW_INITIALIZER(&ia6flags, "ia6flags", NULL,
    103     "ia6flag", ia6flagskw, __arraycount(ia6flagskw), &command_root.pb_parser);
    104 struct pkw inet6 = PKW_INITIALIZER(&inet6, "IPv6 keywords", NULL,
    105     NULL, inet6kw, __arraycount(inet6kw), NULL);
    106 
    107 static void in6_delscopeid(struct sockaddr_in6 *sin6);
    108 static int setia6lifetime(prop_dictionary_t, int64_t, time_t *, uint32_t *);
    109 static void in6_alias(const char *, prop_dictionary_t, prop_dictionary_t,
    110     struct in6_ifreq *);
    111 
    112 static int
    113 prefix(void *val, int size)
    114 {
    115 	u_char *pname = (u_char *)val;
    116 	int byte, bit, plen = 0;
    117 
    118 	for (byte = 0; byte < size; byte++, plen += 8)
    119 		if (pname[byte] != 0xff)
    120 			break;
    121 	if (byte == size)
    122 		return (plen);
    123 	for (bit = 7; bit != 0; bit--, plen++)
    124 		if (!(pname[byte] & (1 << bit)))
    125 			break;
    126 	for (; bit != 0; bit--)
    127 		if (pname[byte] & (1 << bit))
    128 			return(0);
    129 	byte++;
    130 	for (; byte < size; byte++)
    131 		if (pname[byte])
    132 			return(0);
    133 	return (plen);
    134 }
    135 
    136 int
    137 setia6flags_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    138 {
    139 	int64_t ia6flag;
    140 
    141 	if (!prop_dictionary_get_int64(env, "ia6flag", &ia6flag)) {
    142 		errno = ENOENT;
    143 		return -1;
    144 	}
    145 
    146 	if (ia6flag < 0) {
    147 		ia6flag = -ia6flag;
    148 		ifra->ifra_flags &= ~ia6flag;
    149 	} else
    150 		ifra->ifra_flags |= ia6flag;
    151 	return 0;
    152 }
    153 
    154 int
    155 setia6pltime_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    156 {
    157 	int64_t pltime;
    158 
    159 	if (!prop_dictionary_get_int64(env, "pltime", &pltime)) {
    160 		errno = ENOENT;
    161 		return -1;
    162 	}
    163 
    164 	return setia6lifetime(env, pltime,
    165 	    &ifra->ifra_lifetime.ia6t_preferred,
    166 	    &ifra->ifra_lifetime.ia6t_pltime);
    167 }
    168 
    169 int
    170 setia6vltime_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    171 {
    172 	int64_t vltime;
    173 
    174 	if (!prop_dictionary_get_int64(env, "vltime", &vltime)) {
    175 		errno = ENOENT;
    176 		return -1;
    177 	}
    178 
    179 	return setia6lifetime(env, vltime,
    180 		&ifra->ifra_lifetime.ia6t_expire,
    181 		&ifra->ifra_lifetime.ia6t_vltime);
    182 }
    183 
    184 static int
    185 setia6lifetime(prop_dictionary_t env, int64_t val, time_t *timep,
    186     uint32_t *ivalp)
    187 {
    188 	time_t t;
    189 	int af;
    190 
    191 	if ((af = getaf(env)) == -1 || af != AF_INET6) {
    192 		errx(EXIT_FAILURE,
    193 		    "inet6 address lifetime not allowed for the AF");
    194 	}
    195 
    196 	t = time(NULL);
    197 	*timep = t + val;
    198 	*ivalp = val;
    199 	return 0;
    200 }
    201 
    202 int
    203 setia6eui64_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    204 {
    205 	char buf[2][80];
    206 	struct ifaddrs *ifap, *ifa;
    207 	const struct sockaddr_in6 *sin6 = NULL;
    208 	const struct in6_addr *lladdr = NULL;
    209 	struct in6_addr *in6;
    210 	const char *ifname;
    211 	bool doit = false;
    212 	int af;
    213 
    214 	if (!prop_dictionary_get_bool(env, "eui64", &doit) || !doit) {
    215 		errno = ENOENT;
    216 		return -1;
    217 	}
    218 
    219 	if ((ifname = getifname(env)) == NULL)
    220 		return -1;
    221 
    222 	af = getaf(env);
    223 	if (af != AF_INET6) {
    224 		errx(EXIT_FAILURE,
    225 		    "eui64 address modifier not allowed for the AF");
    226 	}
    227  	in6 = &ifra->ifra_addr.sin6_addr;
    228 	if (memcmp(&in6addr_any.s6_addr[8], &in6->s6_addr[8], 8) != 0) {
    229 		union {
    230 			struct sockaddr_in6 sin6;
    231 			struct sockaddr sa;
    232 		} any = {.sin6 = {.sin6_family = AF_INET6}};
    233 		memcpy(&any.sin6.sin6_addr, &in6addr_any,
    234 		    sizeof(any.sin6.sin6_addr));
    235 		(void)sockaddr_snprintf(buf[0], sizeof(buf[0]), "%a%%S",
    236 		    &any.sa);
    237 		(void)sockaddr_snprintf(buf[1], sizeof(buf[1]), "%a%%S",
    238 		    (const struct sockaddr *)&ifra->ifra_addr);
    239 		errx(EXIT_FAILURE, "interface index is already filled, %s | %s",
    240 		    buf[0], buf[1]);
    241 	}
    242 	if (getifaddrs(&ifap) != 0)
    243 		err(EXIT_FAILURE, "getifaddrs");
    244 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
    245 		if (ifa->ifa_addr->sa_family == AF_INET6 &&
    246 		    strcmp(ifa->ifa_name, ifname) == 0) {
    247 			sin6 = (const struct sockaddr_in6 *)ifa->ifa_addr;
    248 			if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
    249 				lladdr = &sin6->sin6_addr;
    250 				break;
    251 			}
    252 		}
    253 	}
    254 	if (!lladdr)
    255 		errx(EXIT_FAILURE, "could not determine link local address");
    256 
    257  	memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);
    258 
    259 	freeifaddrs(ifap);
    260 	return 0;
    261 }
    262 
    263 /* KAME idiosyncrasy */
    264 static void
    265 in6_delscopeid(struct sockaddr_in6 *sin6)
    266 {
    267 	if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
    268 	    sin6->sin6_scope_id == 0)
    269 		return;
    270 
    271 	*(u_int16_t *)&sin6->sin6_addr.s6_addr[2] = htons(sin6->sin6_scope_id);
    272 	sin6->sin6_scope_id = 0;
    273 }
    274 
    275 /* KAME idiosyncrasy */
    276 void
    277 in6_fillscopeid(struct sockaddr_in6 *sin6)
    278 {
    279 	if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
    280 		sin6->sin6_scope_id =
    281 			ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
    282 		sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
    283 	}
    284 }
    285 
    286 /* XXX not really an alias */
    287 void
    288 in6_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv,
    289     struct in6_ifreq *creq)
    290 {
    291 	struct in6_ifreq ifr6;
    292 	struct sockaddr_in6 *sin6;
    293 	char hbuf[NI_MAXHOST];
    294 	u_int32_t scopeid;
    295 	int s;
    296 	const int niflag = NI_NUMERICHOST;
    297 	unsigned short flags;
    298 
    299 	/* Get the non-alias address for this interface. */
    300 	if ((s = getsock(AF_INET6)) == -1) {
    301 		if (errno == EAFNOSUPPORT)
    302 			return;
    303 		err(EXIT_FAILURE, "socket");
    304 	}
    305 
    306 	sin6 = &creq->ifr_addr;
    307 
    308 	in6_fillscopeid(sin6);
    309 	scopeid = sin6->sin6_scope_id;
    310 	if (getnameinfo((const struct sockaddr *)sin6, sin6->sin6_len,
    311 			hbuf, sizeof(hbuf), NULL, 0, niflag))
    312 		strlcpy(hbuf, "", sizeof(hbuf));	/* some message? */
    313 	printf("\tinet6 %s", hbuf);
    314 
    315 	if (getifflags(env, oenv, &flags) == -1)
    316 		err(EXIT_FAILURE, "%s: getifflags", __func__);
    317 
    318 	if (flags & IFF_POINTOPOINT) {
    319 		ifr6 = *creq;
    320 		if (ioctl(s, SIOCGIFDSTADDR_IN6, &ifr6) == -1) {
    321 			if (errno != EADDRNOTAVAIL)
    322 				warn("SIOCGIFDSTADDR_IN6");
    323 			memset(&ifr6.ifr_addr, 0, sizeof(ifr6.ifr_addr));
    324 			ifr6.ifr_addr.sin6_family = AF_INET6;
    325 			ifr6.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
    326 		}
    327 		sin6 = &ifr6.ifr_addr;
    328 		in6_fillscopeid(sin6);
    329 		hbuf[0] = '\0';
    330 		if (getnameinfo((struct sockaddr *)sin6, sin6->sin6_len,
    331 				hbuf, sizeof(hbuf), NULL, 0, niflag))
    332 			strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
    333 		printf(" -> %s", hbuf);
    334 	}
    335 
    336 	ifr6 = *creq;
    337 	if (ioctl(s, SIOCGIFNETMASK_IN6, &ifr6) == -1) {
    338 		if (errno != EADDRNOTAVAIL)
    339 			warn("SIOCGIFNETMASK_IN6");
    340 	} else {
    341 		sin6 = &ifr6.ifr_addr;
    342 		printf(" prefixlen %d", prefix(&sin6->sin6_addr,
    343 					       sizeof(struct in6_addr)));
    344 	}
    345 
    346 	ifr6 = *creq;
    347 	if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == -1) {
    348 		if (errno != EADDRNOTAVAIL)
    349 			warn("SIOCGIFAFLAG_IN6");
    350 	} else {
    351 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_ANYCAST)
    352 			printf(" anycast");
    353 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_TENTATIVE)
    354 			printf(" tentative");
    355 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DUPLICATED)
    356 			printf(" duplicated");
    357 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DETACHED)
    358 			printf(" detached");
    359 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DEPRECATED)
    360 			printf(" deprecated");
    361 	}
    362 
    363 	if (scopeid)
    364 		printf(" scopeid 0x%x", scopeid);
    365 
    366 	if (Lflag) {
    367 		struct in6_addrlifetime *lifetime;
    368 		ifr6 = *creq;
    369 		lifetime = &ifr6.ifr_ifru.ifru_lifetime;
    370 		if (ioctl(s, SIOCGIFALIFETIME_IN6, &ifr6) == -1) {
    371 			if (errno != EADDRNOTAVAIL)
    372 				warn("SIOCGIFALIFETIME_IN6");
    373 		} else if (lifetime->ia6t_preferred || lifetime->ia6t_expire) {
    374 			time_t t = time(NULL);
    375 			printf(" pltime ");
    376 			if (lifetime->ia6t_preferred) {
    377 				printf("%lu",
    378 				    (unsigned long)(lifetime->ia6t_preferred -
    379 				        MIN(t, lifetime->ia6t_preferred)));
    380 			} else
    381 				printf("infty");
    382 
    383 			printf(" vltime ");
    384 			if (lifetime->ia6t_expire) {
    385 				printf("%lu",
    386 				    (unsigned long)(lifetime->ia6t_expire -
    387 				        MIN(t, lifetime->ia6t_expire)));
    388 			} else
    389 				printf("infty");
    390 		}
    391 	}
    392 
    393 	printf("\n");
    394 }
    395 
    396 void
    397 in6_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
    398 {
    399 	struct ifaddrs *ifap, *ifa;
    400 	struct in6_ifreq ifr;
    401 	const char *ifname;
    402 
    403 	if ((ifname = getifname(env)) == NULL)
    404 		err(EXIT_FAILURE, "%s: getifname", __func__);
    405 
    406 	if (getifaddrs(&ifap) != 0)
    407 		err(EXIT_FAILURE, "getifaddrs");
    408 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
    409 		if (strcmp(ifname, ifa->ifa_name) != 0)
    410 			continue;
    411 		if (ifa->ifa_addr->sa_family != AF_INET6)
    412 			continue;
    413 		if (sizeof(ifr.ifr_addr) < ifa->ifa_addr->sa_len)
    414 			continue;
    415 
    416 		memset(&ifr, 0, sizeof(ifr));
    417 		estrlcpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
    418 		memcpy(&ifr.ifr_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len);
    419 		in6_alias(ifname, env, oenv, &ifr);
    420 	}
    421 	freeifaddrs(ifap);
    422 }
    423 
    424 static int
    425 in6_pre_aifaddr(prop_dictionary_t env, struct afparam *param)
    426 {
    427 	struct in6_aliasreq *ifra = param->req.buf;
    428 
    429 	setia6eui64_impl(env, ifra);
    430 	setia6vltime_impl(env, ifra);
    431 	setia6pltime_impl(env, ifra);
    432 	setia6flags_impl(env, ifra);
    433 	in6_delscopeid(&ifra->ifra_addr);
    434 	in6_delscopeid(&ifra->ifra_dstaddr);
    435 
    436 	return 0;
    437 }
    438 
    439 void
    440 in6_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
    441 {
    442 	struct in6_ifreq in6_ifr = {
    443 		.ifr_addr = {
    444 			.sin6_family = AF_INET6,
    445 			.sin6_len = sizeof(in6_ifr.ifr_addr),
    446 			.sin6_addr = {
    447 				.s6_addr =
    448 				    {0xff, 0xff, 0xff, 0xff,
    449 				     0xff, 0xff, 0xff, 0xff}
    450 			}
    451 		}
    452 	};
    453 	static struct sockaddr_in6 in6_defmask = {
    454 		.sin6_family = AF_INET6,
    455 		.sin6_len = sizeof(in6_defmask),
    456 		.sin6_addr = {
    457 			.s6_addr = {0xff, 0xff, 0xff, 0xff,
    458 			            0xff, 0xff, 0xff, 0xff}
    459 		}
    460 	};
    461 
    462 	struct in6_aliasreq in6_ifra = {
    463 		.ifra_prefixmask = {
    464 			.sin6_family = AF_INET6,
    465 			.sin6_len = sizeof(in6_ifra.ifra_prefixmask),
    466 			.sin6_addr = {
    467 				.s6_addr =
    468 				    {0xff, 0xff, 0xff, 0xff,
    469 				     0xff, 0xff, 0xff, 0xff}}},
    470 		.ifra_lifetime = {
    471 			  .ia6t_pltime = ND6_INFINITE_LIFETIME
    472 			, .ia6t_vltime = ND6_INFINITE_LIFETIME
    473 		}
    474 	};
    475 	struct afparam in6param = {
    476 		  .req = BUFPARAM(in6_ifra)
    477 		, .dgreq = BUFPARAM(in6_ifr)
    478 		, .name = {
    479 			{.buf = in6_ifr.ifr_name,
    480 			 .buflen = sizeof(in6_ifr.ifr_name)},
    481 			{.buf = in6_ifra.ifra_name,
    482 			 .buflen = sizeof(in6_ifra.ifra_name)}
    483 		  }
    484 		, .dgaddr = BUFPARAM(in6_ifr.ifr_addr)
    485 		, .addr = BUFPARAM(in6_ifra.ifra_addr)
    486 		, .dst = BUFPARAM(in6_ifra.ifra_dstaddr)
    487 		, .brd = BUFPARAM(in6_ifra.ifra_broadaddr)
    488 		, .mask = BUFPARAM(in6_ifra.ifra_prefixmask)
    489 		, .aifaddr = IFADDR_PARAM(SIOCAIFADDR_IN6)
    490 		, .difaddr = IFADDR_PARAM(SIOCDIFADDR_IN6)
    491 		, .gifaddr = IFADDR_PARAM(SIOCGIFADDR_IN6)
    492 		, .defmask = BUFPARAM(in6_defmask)
    493 		, .pre_aifaddr = in6_pre_aifaddr
    494 	};
    495 	commit_address(env, oenv, &in6param);
    496 }
    497