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af_inet6.c revision 1.21 
      1 /*	$NetBSD: af_inet6.c,v 1.21 2008/05/12 20:58:16 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 1.21 2008/05/12 20:58:16 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 static const struct kwinst ia6flagskw[] = {
     62 	  IFKW("anycast",	IN6_IFF_ANYCAST)
     63 	, IFKW("tentative",	IN6_IFF_TENTATIVE)
     64 	, IFKW("deprecated",	IN6_IFF_DEPRECATED)
     65 };
     66 
     67 static struct pinteger parse_pltime = PINTEGER_INITIALIZER(&parse_pltime,
     68     "pltime", 0, NULL, "pltime", &command_root.pb_parser);
     69 
     70 static struct pinteger parse_vltime = PINTEGER_INITIALIZER(&parse_vltime,
     71     "vltime", 0, NULL, "vltime", &command_root.pb_parser);
     72 
     73 static const struct kwinst inet6kw[] = {
     74 	  {.k_word = "pltime", .k_nextparser = &parse_pltime.pi_parser}
     75 	, {.k_word = "vltime", .k_nextparser = &parse_vltime.pi_parser}
     76 	, {.k_word = "eui64", .k_key = "eui64", .k_type = KW_T_BOOL,
     77 	   .k_bool = true, .k_nextparser = &command_root.pb_parser}
     78 };
     79 
     80 struct pkw ia6flags = PKW_INITIALIZER(&ia6flags, "ia6flags", NULL,
     81     "ia6flag", ia6flagskw, __arraycount(ia6flagskw), &command_root.pb_parser);
     82 struct pkw inet6 = PKW_INITIALIZER(&inet6, "IPv6 keywords", NULL,
     83     NULL, inet6kw, __arraycount(inet6kw), NULL);
     84 
     85 static void in6_delscopeid(struct sockaddr_in6 *sin6);
     86 static int setia6lifetime(prop_dictionary_t, int64_t, time_t *, uint32_t *);
     87 static void in6_alias(const char *, prop_dictionary_t, prop_dictionary_t,
     88     struct in6_ifreq *);
     89 
     90 static int
     91 prefix(void *val, int size)
     92 {
     93 	u_char *pname = (u_char *)val;
     94 	int byte, bit, plen = 0;
     95 
     96 	for (byte = 0; byte < size; byte++, plen += 8)
     97 		if (pname[byte] != 0xff)
     98 			break;
     99 	if (byte == size)
    100 		return (plen);
    101 	for (bit = 7; bit != 0; bit--, plen++)
    102 		if (!(pname[byte] & (1 << bit)))
    103 			break;
    104 	for (; bit != 0; bit--)
    105 		if (pname[byte] & (1 << bit))
    106 			return(0);
    107 	byte++;
    108 	for (; byte < size; byte++)
    109 		if (pname[byte])
    110 			return(0);
    111 	return (plen);
    112 }
    113 
    114 int
    115 setia6flags_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    116 {
    117 	int64_t ia6flag;
    118 
    119 	if (!prop_dictionary_get_int64(env, "ia6flag", &ia6flag)) {
    120 		errno = ENOENT;
    121 		return -1;
    122 	}
    123 
    124 	if (ia6flag < 0) {
    125 		ia6flag = -ia6flag;
    126 		ifra->ifra_flags &= ~ia6flag;
    127 	} else
    128 		ifra->ifra_flags |= ia6flag;
    129 	return 0;
    130 }
    131 
    132 int
    133 setia6pltime_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    134 {
    135 	int64_t pltime;
    136 
    137 	if (!prop_dictionary_get_int64(env, "pltime", &pltime)) {
    138 		errno = ENOENT;
    139 		return -1;
    140 	}
    141 
    142 	return setia6lifetime(env, pltime,
    143 	    &ifra->ifra_lifetime.ia6t_preferred,
    144 	    &ifra->ifra_lifetime.ia6t_pltime);
    145 }
    146 
    147 int
    148 setia6vltime_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    149 {
    150 	int64_t vltime;
    151 
    152 	if (!prop_dictionary_get_int64(env, "vltime", &vltime)) {
    153 		errno = ENOENT;
    154 		return -1;
    155 	}
    156 
    157 	return setia6lifetime(env, vltime,
    158 		&ifra->ifra_lifetime.ia6t_expire,
    159 		&ifra->ifra_lifetime.ia6t_vltime);
    160 }
    161 
    162 static int
    163 setia6lifetime(prop_dictionary_t env, int64_t val, time_t *timep,
    164     uint32_t *ivalp)
    165 {
    166 	time_t t;
    167 	int af;
    168 
    169 	if ((af = getaf(env)) == -1 || af != AF_INET6) {
    170 		errx(EXIT_FAILURE,
    171 		    "inet6 address lifetime not allowed for the AF");
    172 	}
    173 
    174 	t = time(NULL);
    175 	*timep = t + val;
    176 	*ivalp = val;
    177 	return 0;
    178 }
    179 
    180 int
    181 setia6eui64_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    182 {
    183 	char buf[2][80];
    184 	struct ifaddrs *ifap, *ifa;
    185 	const struct sockaddr_in6 *sin6 = NULL;
    186 	const struct in6_addr *lladdr = NULL;
    187 	struct in6_addr *in6;
    188 	const char *ifname;
    189 	bool doit = false;
    190 	int af;
    191 
    192 	if (!prop_dictionary_get_bool(env, "eui64", &doit) || !doit) {
    193 		errno = ENOENT;
    194 		return -1;
    195 	}
    196 
    197 	if ((ifname = getifname(env)) == NULL)
    198 		return -1;
    199 
    200 	af = getaf(env);
    201 	if (af != AF_INET6) {
    202 		errx(EXIT_FAILURE,
    203 		    "eui64 address modifier not allowed for the AF");
    204 	}
    205  	in6 = &ifra->ifra_addr.sin6_addr;
    206 	if (memcmp(&in6addr_any.s6_addr[8], &in6->s6_addr[8], 8) != 0) {
    207 		union {
    208 			struct sockaddr_in6 sin6;
    209 			struct sockaddr sa;
    210 		} any = {.sin6 = {.sin6_family = AF_INET6}};
    211 		memcpy(&any.sin6.sin6_addr, &in6addr_any,
    212 		    sizeof(any.sin6.sin6_addr));
    213 		(void)sockaddr_snprintf(buf[0], sizeof(buf[0]), "%a%%S",
    214 		    &any.sa);
    215 		(void)sockaddr_snprintf(buf[1], sizeof(buf[1]), "%a%%S",
    216 		    (const struct sockaddr *)&ifra->ifra_addr);
    217 		errx(EXIT_FAILURE, "interface index is already filled, %s | %s",
    218 		    buf[0], buf[1]);
    219 	}
    220 	if (getifaddrs(&ifap) != 0)
    221 		err(EXIT_FAILURE, "getifaddrs");
    222 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
    223 		if (ifa->ifa_addr->sa_family == AF_INET6 &&
    224 		    strcmp(ifa->ifa_name, ifname) == 0) {
    225 			sin6 = (const struct sockaddr_in6 *)ifa->ifa_addr;
    226 			if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
    227 				lladdr = &sin6->sin6_addr;
    228 				break;
    229 			}
    230 		}
    231 	}
    232 	if (!lladdr)
    233 		errx(EXIT_FAILURE, "could not determine link local address");
    234 
    235  	memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);
    236 
    237 	freeifaddrs(ifap);
    238 	return 0;
    239 }
    240 
    241 /* KAME idiosyncrasy */
    242 static void
    243 in6_delscopeid(struct sockaddr_in6 *sin6)
    244 {
    245 	if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
    246 	    sin6->sin6_scope_id == 0)
    247 		return;
    248 
    249 	*(u_int16_t *)&sin6->sin6_addr.s6_addr[2] = htons(sin6->sin6_scope_id);
    250 	sin6->sin6_scope_id = 0;
    251 }
    252 
    253 /* KAME idiosyncrasy */
    254 void
    255 in6_fillscopeid(struct sockaddr_in6 *sin6)
    256 {
    257 	if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
    258 		sin6->sin6_scope_id =
    259 			ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
    260 		sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
    261 	}
    262 }
    263 
    264 /* XXX not really an alias */
    265 void
    266 in6_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv,
    267     struct in6_ifreq *creq)
    268 {
    269 	struct in6_ifreq ifr6;
    270 	struct sockaddr_in6 *sin6;
    271 	char hbuf[NI_MAXHOST];
    272 	u_int32_t scopeid;
    273 	int s;
    274 	const int niflag = NI_NUMERICHOST;
    275 	unsigned short flags;
    276 
    277 	/* Get the non-alias address for this interface. */
    278 	if ((s = getsock(AF_INET6)) == -1) {
    279 		if (errno == EAFNOSUPPORT)
    280 			return;
    281 		err(EXIT_FAILURE, "socket");
    282 	}
    283 
    284 	sin6 = &creq->ifr_addr;
    285 
    286 	in6_fillscopeid(sin6);
    287 	scopeid = sin6->sin6_scope_id;
    288 	if (getnameinfo((const struct sockaddr *)sin6, sin6->sin6_len,
    289 			hbuf, sizeof(hbuf), NULL, 0, niflag))
    290 		strlcpy(hbuf, "", sizeof(hbuf));	/* some message? */
    291 	printf("\tinet6 %s", hbuf);
    292 
    293 	if (getifflags(env, oenv, &flags) == -1)
    294 		err(EXIT_FAILURE, "%s: getifflags", __func__);
    295 
    296 	if (flags & IFF_POINTOPOINT) {
    297 		ifr6 = *creq;
    298 		if (ioctl(s, SIOCGIFDSTADDR_IN6, &ifr6) == -1) {
    299 			if (errno != EADDRNOTAVAIL)
    300 				warn("SIOCGIFDSTADDR_IN6");
    301 			memset(&ifr6.ifr_addr, 0, sizeof(ifr6.ifr_addr));
    302 			ifr6.ifr_addr.sin6_family = AF_INET6;
    303 			ifr6.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
    304 		}
    305 		sin6 = &ifr6.ifr_addr;
    306 		in6_fillscopeid(sin6);
    307 		hbuf[0] = '\0';
    308 		if (getnameinfo((struct sockaddr *)sin6, sin6->sin6_len,
    309 				hbuf, sizeof(hbuf), NULL, 0, niflag))
    310 			strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
    311 		printf(" -> %s", hbuf);
    312 	}
    313 
    314 	ifr6 = *creq;
    315 	if (ioctl(s, SIOCGIFNETMASK_IN6, &ifr6) == -1) {
    316 		if (errno != EADDRNOTAVAIL)
    317 			warn("SIOCGIFNETMASK_IN6");
    318 	} else {
    319 		sin6 = &ifr6.ifr_addr;
    320 		printf(" prefixlen %d", prefix(&sin6->sin6_addr,
    321 					       sizeof(struct in6_addr)));
    322 	}
    323 
    324 	ifr6 = *creq;
    325 	if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == -1) {
    326 		if (errno != EADDRNOTAVAIL)
    327 			warn("SIOCGIFAFLAG_IN6");
    328 	} else {
    329 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_ANYCAST)
    330 			printf(" anycast");
    331 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_TENTATIVE)
    332 			printf(" tentative");
    333 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DUPLICATED)
    334 			printf(" duplicated");
    335 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DETACHED)
    336 			printf(" detached");
    337 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DEPRECATED)
    338 			printf(" deprecated");
    339 	}
    340 
    341 	if (scopeid)
    342 		printf(" scopeid 0x%x", scopeid);
    343 
    344 	if (Lflag) {
    345 		struct in6_addrlifetime *lifetime;
    346 		ifr6 = *creq;
    347 		lifetime = &ifr6.ifr_ifru.ifru_lifetime;
    348 		if (ioctl(s, SIOCGIFALIFETIME_IN6, &ifr6) == -1) {
    349 			if (errno != EADDRNOTAVAIL)
    350 				warn("SIOCGIFALIFETIME_IN6");
    351 		} else if (lifetime->ia6t_preferred || lifetime->ia6t_expire) {
    352 			time_t t = time(NULL);
    353 			printf(" pltime ");
    354 			if (lifetime->ia6t_preferred) {
    355 				printf("%lu",
    356 				    (unsigned long)(lifetime->ia6t_preferred -
    357 				        MIN(t, lifetime->ia6t_preferred)));
    358 			} else
    359 				printf("infty");
    360 
    361 			printf(" vltime ");
    362 			if (lifetime->ia6t_expire) {
    363 				printf("%lu",
    364 				    (unsigned long)(lifetime->ia6t_expire -
    365 				        MIN(t, lifetime->ia6t_expire)));
    366 			} else
    367 				printf("infty");
    368 		}
    369 	}
    370 
    371 	printf("\n");
    372 }
    373 
    374 void
    375 in6_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
    376 {
    377 	struct ifaddrs *ifap, *ifa;
    378 	struct in6_ifreq ifr;
    379 	const char *ifname;
    380 
    381 	if ((ifname = getifname(env)) == NULL)
    382 		err(EXIT_FAILURE, "%s: getifname", __func__);
    383 
    384 	if (getifaddrs(&ifap) != 0)
    385 		err(EXIT_FAILURE, "getifaddrs");
    386 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
    387 		if (strcmp(ifname, ifa->ifa_name) != 0)
    388 			continue;
    389 		if (ifa->ifa_addr->sa_family != AF_INET6)
    390 			continue;
    391 		if (sizeof(ifr.ifr_addr) < ifa->ifa_addr->sa_len)
    392 			continue;
    393 
    394 		memset(&ifr, 0, sizeof(ifr));
    395 		estrlcpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
    396 		memcpy(&ifr.ifr_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len);
    397 		in6_alias(ifname, env, oenv, &ifr);
    398 	}
    399 	freeifaddrs(ifap);
    400 }
    401 
    402 static int
    403 in6_pre_aifaddr(prop_dictionary_t env, struct afparam *param)
    404 {
    405 	struct in6_aliasreq *ifra = param->req.buf;
    406 
    407 	setia6eui64_impl(env, ifra);
    408 	setia6vltime_impl(env, ifra);
    409 	setia6pltime_impl(env, ifra);
    410 	setia6flags_impl(env, ifra);
    411 	in6_delscopeid(&ifra->ifra_addr);
    412 	in6_delscopeid(&ifra->ifra_dstaddr);
    413 
    414 	return 0;
    415 }
    416 
    417 void
    418 in6_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
    419 {
    420 	struct in6_ifreq in6_ifr = {
    421 		.ifr_addr = {
    422 			.sin6_family = AF_INET6,
    423 			.sin6_len = sizeof(in6_ifr.ifr_addr),
    424 			.sin6_addr = {
    425 				.s6_addr =
    426 				    {0xff, 0xff, 0xff, 0xff,
    427 				     0xff, 0xff, 0xff, 0xff}
    428 			}
    429 		}
    430 	};
    431 	static struct sockaddr_in6 in6_defmask = {
    432 		.sin6_family = AF_INET6,
    433 		.sin6_len = sizeof(in6_defmask),
    434 		.sin6_addr = {
    435 			.s6_addr = {0xff, 0xff, 0xff, 0xff,
    436 			            0xff, 0xff, 0xff, 0xff}
    437 		}
    438 	};
    439 
    440 	struct in6_aliasreq in6_ifra = {
    441 		.ifra_prefixmask = {
    442 			.sin6_family = AF_INET6,
    443 			.sin6_len = sizeof(in6_ifra.ifra_prefixmask),
    444 			.sin6_addr = {
    445 				.s6_addr =
    446 				    {0xff, 0xff, 0xff, 0xff,
    447 				     0xff, 0xff, 0xff, 0xff}}},
    448 		.ifra_lifetime = {
    449 			  .ia6t_pltime = ND6_INFINITE_LIFETIME
    450 			, .ia6t_vltime = ND6_INFINITE_LIFETIME
    451 		}
    452 	};
    453 	struct afparam in6param = {
    454 		  .req = BUFPARAM(in6_ifra)
    455 		, .dgreq = BUFPARAM(in6_ifr)
    456 		, .name = {
    457 			{.buf = in6_ifr.ifr_name,
    458 			 .buflen = sizeof(in6_ifr.ifr_name)},
    459 			{.buf = in6_ifra.ifra_name,
    460 			 .buflen = sizeof(in6_ifra.ifra_name)}
    461 		  }
    462 		, .dgaddr = BUFPARAM(in6_ifr.ifr_addr)
    463 		, .addr = BUFPARAM(in6_ifra.ifra_addr)
    464 		, .dst = BUFPARAM(in6_ifra.ifra_dstaddr)
    465 		, .brd = BUFPARAM(in6_ifra.ifra_broadaddr)
    466 		, .mask = BUFPARAM(in6_ifra.ifra_prefixmask)
    467 		, .aifaddr = IFADDR_PARAM(SIOCAIFADDR_IN6)
    468 		, .difaddr = IFADDR_PARAM(SIOCDIFADDR_IN6)
    469 		, .gifaddr = IFADDR_PARAM(SIOCGIFADDR_IN6)
    470 		, .defmask = BUFPARAM(in6_defmask)
    471 		, .pre_aifaddr = in6_pre_aifaddr
    472 	};
    473 	commit_address(env, oenv, &in6param);
    474 }
    475