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af_inet6.c revision 1.5.18.2
      1 /*	$NetBSD: af_inet6.c,v 1.5.18.2 2008/09/28 11:17:11 mjf 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 1.5.18.2 2008/09/28 11:17:11 mjf 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 "extern.h"
     57 #include "parse.h"
     58 #include "extern.h"
     59 #include "af_inetany.h"
     60 
     61 static void in6_constructor(void) __attribute__((constructor));
     62 static void in6_alias(const char *, prop_dictionary_t, prop_dictionary_t,
     63     struct in6_ifreq *);
     64 static void in6_commit_address(prop_dictionary_t, prop_dictionary_t);
     65 
     66 static int setia6eui64_impl(prop_dictionary_t, struct in6_aliasreq *);
     67 static int setia6flags_impl(prop_dictionary_t, struct in6_aliasreq *);
     68 static int setia6pltime_impl(prop_dictionary_t, struct in6_aliasreq *);
     69 static int setia6vltime_impl(prop_dictionary_t, struct in6_aliasreq *);
     70 
     71 static int setia6lifetime(prop_dictionary_t, int64_t, time_t *, uint32_t *);
     72 
     73 static void in6_delscopeid(struct sockaddr_in6 *sin6);
     74 static void in6_status(prop_dictionary_t, prop_dictionary_t, bool);
     75 
     76 static struct usage_func usage;
     77 static cmdloop_branch_t branch[2];
     78 
     79 static const struct kwinst ia6flagskw[] = {
     80 	  IFKW("anycast",	IN6_IFF_ANYCAST)
     81 	, IFKW("tentative",	IN6_IFF_TENTATIVE)
     82 	, IFKW("deprecated",	IN6_IFF_DEPRECATED)
     83 };
     84 
     85 static struct pinteger parse_pltime = PINTEGER_INITIALIZER(&parse_pltime,
     86     "pltime", 0, NULL, "pltime", &command_root.pb_parser);
     87 
     88 static struct pinteger parse_vltime = PINTEGER_INITIALIZER(&parse_vltime,
     89     "vltime", 0, NULL, "vltime", &command_root.pb_parser);
     90 
     91 static const struct kwinst inet6kw[] = {
     92 	  {.k_word = "pltime", .k_nextparser = &parse_pltime.pi_parser}
     93 	, {.k_word = "vltime", .k_nextparser = &parse_vltime.pi_parser}
     94 	, {.k_word = "eui64", .k_key = "eui64", .k_type = KW_T_BOOL,
     95 	   .k_bool = true, .k_nextparser = &command_root.pb_parser}
     96 };
     97 
     98 struct pkw ia6flags = PKW_INITIALIZER(&ia6flags, "ia6flags", NULL,
     99     "ia6flag", ia6flagskw, __arraycount(ia6flagskw), &command_root.pb_parser);
    100 struct pkw inet6 = PKW_INITIALIZER(&inet6, "IPv6 keywords", NULL,
    101     NULL, inet6kw, __arraycount(inet6kw), NULL);
    102 
    103 static struct afswtch in6af = {
    104 	.af_name = "inet6", .af_af = AF_INET6, .af_status = in6_status,
    105 	.af_addr_commit = in6_commit_address
    106 };
    107 
    108 static int
    109 prefix(void *val, int size)
    110 {
    111 	u_char *pname = (u_char *)val;
    112 	int byte, bit, plen = 0;
    113 
    114 	for (byte = 0; byte < size; byte++, plen += 8)
    115 		if (pname[byte] != 0xff)
    116 			break;
    117 	if (byte == size)
    118 		return (plen);
    119 	for (bit = 7; bit != 0; bit--, plen++)
    120 		if (!(pname[byte] & (1 << bit)))
    121 			break;
    122 	for (; bit != 0; bit--)
    123 		if (pname[byte] & (1 << bit))
    124 			return(0);
    125 	byte++;
    126 	for (; byte < size; byte++)
    127 		if (pname[byte])
    128 			return(0);
    129 	return (plen);
    130 }
    131 
    132 int
    133 setia6flags_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    134 {
    135 	int64_t ia6flag;
    136 
    137 	if (!prop_dictionary_get_int64(env, "ia6flag", &ia6flag)) {
    138 		errno = ENOENT;
    139 		return -1;
    140 	}
    141 
    142 	if (ia6flag < 0) {
    143 		ia6flag = -ia6flag;
    144 		ifra->ifra_flags &= ~ia6flag;
    145 	} else
    146 		ifra->ifra_flags |= ia6flag;
    147 	return 0;
    148 }
    149 
    150 int
    151 setia6pltime_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    152 {
    153 	int64_t pltime;
    154 
    155 	if (!prop_dictionary_get_int64(env, "pltime", &pltime)) {
    156 		errno = ENOENT;
    157 		return -1;
    158 	}
    159 
    160 	return setia6lifetime(env, pltime,
    161 	    &ifra->ifra_lifetime.ia6t_preferred,
    162 	    &ifra->ifra_lifetime.ia6t_pltime);
    163 }
    164 
    165 int
    166 setia6vltime_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    167 {
    168 	int64_t vltime;
    169 
    170 	if (!prop_dictionary_get_int64(env, "vltime", &vltime)) {
    171 		errno = ENOENT;
    172 		return -1;
    173 	}
    174 
    175 	return setia6lifetime(env, vltime,
    176 		&ifra->ifra_lifetime.ia6t_expire,
    177 		&ifra->ifra_lifetime.ia6t_vltime);
    178 }
    179 
    180 static int
    181 setia6lifetime(prop_dictionary_t env, int64_t val, time_t *timep,
    182     uint32_t *ivalp)
    183 {
    184 	time_t t;
    185 	int af;
    186 
    187 	if ((af = getaf(env)) == -1 || af != AF_INET6) {
    188 		errx(EXIT_FAILURE,
    189 		    "inet6 address lifetime not allowed for the AF");
    190 	}
    191 
    192 	t = time(NULL);
    193 	*timep = t + val;
    194 	*ivalp = val;
    195 	return 0;
    196 }
    197 
    198 int
    199 setia6eui64_impl(prop_dictionary_t env, struct in6_aliasreq *ifra)
    200 {
    201 	char buf[2][80];
    202 	struct ifaddrs *ifap, *ifa;
    203 	const struct sockaddr_in6 *sin6 = NULL;
    204 	const struct in6_addr *lladdr = NULL;
    205 	struct in6_addr *in6;
    206 	const char *ifname;
    207 	bool doit = false;
    208 	int af;
    209 
    210 	if (!prop_dictionary_get_bool(env, "eui64", &doit) || !doit) {
    211 		errno = ENOENT;
    212 		return -1;
    213 	}
    214 
    215 	if ((ifname = getifname(env)) == NULL)
    216 		return -1;
    217 
    218 	af = getaf(env);
    219 	if (af != AF_INET6) {
    220 		errx(EXIT_FAILURE,
    221 		    "eui64 address modifier not allowed for the AF");
    222 	}
    223  	in6 = &ifra->ifra_addr.sin6_addr;
    224 	if (memcmp(&in6addr_any.s6_addr[8], &in6->s6_addr[8], 8) != 0) {
    225 		union {
    226 			struct sockaddr_in6 sin6;
    227 			struct sockaddr sa;
    228 		} any = {.sin6 = {.sin6_family = AF_INET6}};
    229 		memcpy(&any.sin6.sin6_addr, &in6addr_any,
    230 		    sizeof(any.sin6.sin6_addr));
    231 		(void)sockaddr_snprintf(buf[0], sizeof(buf[0]), "%a%%S",
    232 		    &any.sa);
    233 		(void)sockaddr_snprintf(buf[1], sizeof(buf[1]), "%a%%S",
    234 		    (const struct sockaddr *)&ifra->ifra_addr);
    235 		errx(EXIT_FAILURE, "interface index is already filled, %s | %s",
    236 		    buf[0], buf[1]);
    237 	}
    238 	if (getifaddrs(&ifap) != 0)
    239 		err(EXIT_FAILURE, "getifaddrs");
    240 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
    241 		if (ifa->ifa_addr->sa_family == AF_INET6 &&
    242 		    strcmp(ifa->ifa_name, ifname) == 0) {
    243 			sin6 = (const struct sockaddr_in6 *)ifa->ifa_addr;
    244 			if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
    245 				lladdr = &sin6->sin6_addr;
    246 				break;
    247 			}
    248 		}
    249 	}
    250 	if (!lladdr)
    251 		errx(EXIT_FAILURE, "could not determine link local address");
    252 
    253  	memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);
    254 
    255 	freeifaddrs(ifap);
    256 	return 0;
    257 }
    258 
    259 /* KAME idiosyncrasy */
    260 static void
    261 in6_delscopeid(struct sockaddr_in6 *sin6)
    262 {
    263 	if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
    264 	    sin6->sin6_scope_id == 0)
    265 		return;
    266 
    267 	*(u_int16_t *)&sin6->sin6_addr.s6_addr[2] = htons(sin6->sin6_scope_id);
    268 	sin6->sin6_scope_id = 0;
    269 }
    270 
    271 /* XXX not really an alias */
    272 void
    273 in6_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv,
    274     struct in6_ifreq *creq)
    275 {
    276 	struct in6_ifreq ifr6;
    277 	struct sockaddr_in6 *sin6;
    278 	char hbuf[NI_MAXHOST];
    279 	u_int32_t scopeid;
    280 	int s;
    281 	const int niflag = NI_NUMERICHOST;
    282 	unsigned short flags;
    283 
    284 	/* Get the non-alias address for this interface. */
    285 	if ((s = getsock(AF_INET6)) == -1) {
    286 		if (errno == EAFNOSUPPORT)
    287 			return;
    288 		err(EXIT_FAILURE, "socket");
    289 	}
    290 
    291 	sin6 = &creq->ifr_addr;
    292 
    293 	in6_fillscopeid(sin6);
    294 	scopeid = sin6->sin6_scope_id;
    295 	if (getnameinfo((const struct sockaddr *)sin6, sin6->sin6_len,
    296 			hbuf, sizeof(hbuf), NULL, 0, niflag))
    297 		strlcpy(hbuf, "", sizeof(hbuf));	/* some message? */
    298 	printf("\tinet6 %s", hbuf);
    299 
    300 	if (getifflags(env, oenv, &flags) == -1)
    301 		err(EXIT_FAILURE, "%s: getifflags", __func__);
    302 
    303 	if (flags & IFF_POINTOPOINT) {
    304 		ifr6 = *creq;
    305 		if (ioctl(s, SIOCGIFDSTADDR_IN6, &ifr6) == -1) {
    306 			if (errno != EADDRNOTAVAIL)
    307 				warn("SIOCGIFDSTADDR_IN6");
    308 			memset(&ifr6.ifr_addr, 0, sizeof(ifr6.ifr_addr));
    309 			ifr6.ifr_addr.sin6_family = AF_INET6;
    310 			ifr6.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
    311 		}
    312 		sin6 = &ifr6.ifr_addr;
    313 		in6_fillscopeid(sin6);
    314 		hbuf[0] = '\0';
    315 		if (getnameinfo((struct sockaddr *)sin6, sin6->sin6_len,
    316 				hbuf, sizeof(hbuf), NULL, 0, niflag))
    317 			strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
    318 		printf(" -> %s", hbuf);
    319 	}
    320 
    321 	ifr6 = *creq;
    322 	if (ioctl(s, SIOCGIFNETMASK_IN6, &ifr6) == -1) {
    323 		if (errno != EADDRNOTAVAIL)
    324 			warn("SIOCGIFNETMASK_IN6");
    325 	} else {
    326 		sin6 = &ifr6.ifr_addr;
    327 		printf(" prefixlen %d", prefix(&sin6->sin6_addr,
    328 					       sizeof(struct in6_addr)));
    329 	}
    330 
    331 	ifr6 = *creq;
    332 	if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == -1) {
    333 		if (errno != EADDRNOTAVAIL)
    334 			warn("SIOCGIFAFLAG_IN6");
    335 	} else {
    336 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_ANYCAST)
    337 			printf(" anycast");
    338 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_TENTATIVE)
    339 			printf(" tentative");
    340 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DUPLICATED)
    341 			printf(" duplicated");
    342 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DETACHED)
    343 			printf(" detached");
    344 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DEPRECATED)
    345 			printf(" deprecated");
    346 	}
    347 
    348 	if (scopeid)
    349 		printf(" scopeid 0x%x", scopeid);
    350 
    351 	if (get_flag('L')) {
    352 		struct in6_addrlifetime *lifetime;
    353 		ifr6 = *creq;
    354 		lifetime = &ifr6.ifr_ifru.ifru_lifetime;
    355 		if (ioctl(s, SIOCGIFALIFETIME_IN6, &ifr6) == -1) {
    356 			if (errno != EADDRNOTAVAIL)
    357 				warn("SIOCGIFALIFETIME_IN6");
    358 		} else if (lifetime->ia6t_preferred || lifetime->ia6t_expire) {
    359 			time_t t = time(NULL);
    360 			printf(" pltime ");
    361 			if (lifetime->ia6t_preferred) {
    362 				printf("%lu",
    363 				    (unsigned long)(lifetime->ia6t_preferred -
    364 				        MIN(t, lifetime->ia6t_preferred)));
    365 			} else
    366 				printf("infty");
    367 
    368 			printf(" vltime ");
    369 			if (lifetime->ia6t_expire) {
    370 				printf("%lu",
    371 				    (unsigned long)(lifetime->ia6t_expire -
    372 				        MIN(t, lifetime->ia6t_expire)));
    373 			} else
    374 				printf("infty");
    375 		}
    376 	}
    377 
    378 	printf("\n");
    379 }
    380 
    381 static void
    382 in6_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
    383 {
    384 	struct ifaddrs *ifap, *ifa;
    385 	struct in6_ifreq ifr;
    386 	const char *ifname;
    387 
    388 	if ((ifname = getifname(env)) == NULL)
    389 		err(EXIT_FAILURE, "%s: getifname", __func__);
    390 
    391 	if (getifaddrs(&ifap) != 0)
    392 		err(EXIT_FAILURE, "getifaddrs");
    393 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
    394 		if (strcmp(ifname, ifa->ifa_name) != 0)
    395 			continue;
    396 		if (ifa->ifa_addr->sa_family != AF_INET6)
    397 			continue;
    398 		if (sizeof(ifr.ifr_addr) < ifa->ifa_addr->sa_len)
    399 			continue;
    400 
    401 		memset(&ifr, 0, sizeof(ifr));
    402 		estrlcpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
    403 		memcpy(&ifr.ifr_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len);
    404 		in6_alias(ifname, env, oenv, &ifr);
    405 	}
    406 	freeifaddrs(ifap);
    407 }
    408 
    409 static int
    410 in6_pre_aifaddr(prop_dictionary_t env, const struct afparam *param)
    411 {
    412 	struct in6_aliasreq *ifra = param->req.buf;
    413 
    414 	setia6eui64_impl(env, ifra);
    415 	setia6vltime_impl(env, ifra);
    416 	setia6pltime_impl(env, ifra);
    417 	setia6flags_impl(env, ifra);
    418 	in6_delscopeid(&ifra->ifra_addr);
    419 	in6_delscopeid(&ifra->ifra_dstaddr);
    420 
    421 	return 0;
    422 }
    423 
    424 static void
    425 in6_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
    426 {
    427 	struct in6_ifreq in6_ifr = {
    428 		.ifr_addr = {
    429 			.sin6_family = AF_INET6,
    430 			.sin6_len = sizeof(in6_ifr.ifr_addr),
    431 			.sin6_addr = {
    432 				.s6_addr =
    433 				    {0xff, 0xff, 0xff, 0xff,
    434 				     0xff, 0xff, 0xff, 0xff}
    435 			}
    436 		}
    437 	};
    438 	static struct sockaddr_in6 in6_defmask = {
    439 		.sin6_family = AF_INET6,
    440 		.sin6_len = sizeof(in6_defmask),
    441 		.sin6_addr = {
    442 			.s6_addr = {0xff, 0xff, 0xff, 0xff,
    443 			            0xff, 0xff, 0xff, 0xff}
    444 		}
    445 	};
    446 
    447 	struct in6_aliasreq in6_ifra = {
    448 		.ifra_prefixmask = {
    449 			.sin6_family = AF_INET6,
    450 			.sin6_len = sizeof(in6_ifra.ifra_prefixmask),
    451 			.sin6_addr = {
    452 				.s6_addr =
    453 				    {0xff, 0xff, 0xff, 0xff,
    454 				     0xff, 0xff, 0xff, 0xff}}},
    455 		.ifra_lifetime = {
    456 			  .ia6t_pltime = ND6_INFINITE_LIFETIME
    457 			, .ia6t_vltime = ND6_INFINITE_LIFETIME
    458 		}
    459 	};
    460 	struct afparam in6param = {
    461 		  .req = BUFPARAM(in6_ifra)
    462 		, .dgreq = BUFPARAM(in6_ifr)
    463 		, .name = {
    464 			{.buf = in6_ifr.ifr_name,
    465 			 .buflen = sizeof(in6_ifr.ifr_name)},
    466 			{.buf = in6_ifra.ifra_name,
    467 			 .buflen = sizeof(in6_ifra.ifra_name)}
    468 		  }
    469 		, .dgaddr = BUFPARAM(in6_ifr.ifr_addr)
    470 		, .addr = BUFPARAM(in6_ifra.ifra_addr)
    471 		, .dst = BUFPARAM(in6_ifra.ifra_dstaddr)
    472 		, .brd = BUFPARAM(in6_ifra.ifra_broadaddr)
    473 		, .mask = BUFPARAM(in6_ifra.ifra_prefixmask)
    474 		, .aifaddr = IFADDR_PARAM(SIOCAIFADDR_IN6)
    475 		, .difaddr = IFADDR_PARAM(SIOCDIFADDR_IN6)
    476 		, .gifaddr = IFADDR_PARAM(SIOCGIFADDR_IN6)
    477 		, .defmask = BUFPARAM(in6_defmask)
    478 		, .pre_aifaddr = in6_pre_aifaddr
    479 	};
    480 	commit_address(env, oenv, &in6param);
    481 }
    482 
    483 static void
    484 in6_usage(prop_dictionary_t env)
    485 {
    486 	fprintf(stderr,
    487 	    "\t[ anycast | -anycast ] [ deprecated | -deprecated ]\n"
    488 	    "\t[ tentative | -tentative ] [ pltime n ] [ vltime n ] "
    489 	    "[ eui64 ]\n");
    490 }
    491 
    492 static void
    493 in6_constructor(void)
    494 {
    495 	if (register_flag('L') != 0)
    496 		err(EXIT_FAILURE, __func__);
    497 	register_family(&in6af);
    498 	usage_func_init(&usage, in6_usage);
    499 	register_usage(&usage);
    500 	cmdloop_branch_init(&branch[0], &ia6flags.pk_parser);
    501 	cmdloop_branch_init(&branch[1], &inet6.pk_parser);
    502 	register_cmdloop_branch(&branch[0]);
    503 	register_cmdloop_branch(&branch[1]);
    504 }
    505