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af_inet6.c revision 1.29 
      1 /*	$NetBSD: af_inet6.c,v 1.29 2013/10/19 15:50:26 christos 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 1.29 2013/10/19 15:50:26 christos 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 #include "prog_ops.h"
     61 
     62 static void in6_constructor(void) __attribute__((constructor));
     63 static void in6_alias(const char *, prop_dictionary_t, prop_dictionary_t,
     64     struct in6_ifreq *);
     65 static void in6_commit_address(prop_dictionary_t, prop_dictionary_t);
     66 
     67 static int setia6eui64_impl(prop_dictionary_t, struct in6_aliasreq *);
     68 static int setia6flags_impl(prop_dictionary_t, struct in6_aliasreq *);
     69 static int setia6pltime_impl(prop_dictionary_t, struct in6_aliasreq *);
     70 static int setia6vltime_impl(prop_dictionary_t, struct in6_aliasreq *);
     71 
     72 static int setia6lifetime(prop_dictionary_t, int64_t, time_t *, uint32_t *);
     73 
     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 == NULL)
    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 /* XXX not really an alias */
    260 void
    261 in6_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv,
    262     struct in6_ifreq *creq)
    263 {
    264 	struct in6_ifreq ifr6;
    265 	struct sockaddr_in6 *sin6;
    266 	char hbuf[NI_MAXHOST];
    267 	u_int32_t scopeid;
    268 	int s;
    269 	const int niflag = Nflag ? 0 : NI_NUMERICHOST;
    270 	unsigned short flags;
    271 
    272 	/* Get the non-alias address for this interface. */
    273 	if ((s = getsock(AF_INET6)) == -1) {
    274 		if (errno == EAFNOSUPPORT)
    275 			return;
    276 		err(EXIT_FAILURE, "socket");
    277 	}
    278 
    279 	sin6 = &creq->ifr_addr;
    280 
    281 	inet6_getscopeid(sin6, INET6_IS_ADDR_LINKLOCAL);
    282 	scopeid = sin6->sin6_scope_id;
    283 	if (getnameinfo((const struct sockaddr *)sin6, sin6->sin6_len,
    284 			hbuf, sizeof(hbuf), NULL, 0, niflag))
    285 		strlcpy(hbuf, "", sizeof(hbuf));	/* some message? */
    286 	printf("\tinet6 %s", hbuf);
    287 
    288 	if (getifflags(env, oenv, &flags) == -1)
    289 		err(EXIT_FAILURE, "%s: getifflags", __func__);
    290 
    291 	if (flags & IFF_POINTOPOINT) {
    292 		ifr6 = *creq;
    293 		if (prog_ioctl(s, SIOCGIFDSTADDR_IN6, &ifr6) == -1) {
    294 			if (errno != EADDRNOTAVAIL)
    295 				warn("SIOCGIFDSTADDR_IN6");
    296 			memset(&ifr6.ifr_addr, 0, sizeof(ifr6.ifr_addr));
    297 			ifr6.ifr_addr.sin6_family = AF_INET6;
    298 			ifr6.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
    299 		}
    300 		sin6 = &ifr6.ifr_addr;
    301 		inet6_getscopeid(sin6, INET6_IS_ADDR_LINKLOCAL);
    302 		hbuf[0] = '\0';
    303 		if (getnameinfo((struct sockaddr *)sin6, sin6->sin6_len,
    304 				hbuf, sizeof(hbuf), NULL, 0, niflag))
    305 			strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */
    306 		printf(" -> %s", hbuf);
    307 	}
    308 
    309 	ifr6 = *creq;
    310 	if (prog_ioctl(s, SIOCGIFNETMASK_IN6, &ifr6) == -1) {
    311 		if (errno != EADDRNOTAVAIL)
    312 			warn("SIOCGIFNETMASK_IN6");
    313 	} else {
    314 		sin6 = &ifr6.ifr_addr;
    315 		printf(" prefixlen %d", prefix(&sin6->sin6_addr,
    316 					       sizeof(struct in6_addr)));
    317 	}
    318 
    319 	ifr6 = *creq;
    320 	if (prog_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == -1) {
    321 		if (errno != EADDRNOTAVAIL)
    322 			warn("SIOCGIFAFLAG_IN6");
    323 	} else {
    324 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_ANYCAST)
    325 			printf(" anycast");
    326 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_TENTATIVE)
    327 			printf(" tentative");
    328 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DUPLICATED)
    329 			printf(" duplicated");
    330 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DETACHED)
    331 			printf(" detached");
    332 		if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DEPRECATED)
    333 			printf(" deprecated");
    334 	}
    335 
    336 	if (scopeid)
    337 		printf(" scopeid 0x%x", scopeid);
    338 
    339 	if (get_flag('L')) {
    340 		struct in6_addrlifetime *lifetime;
    341 		ifr6 = *creq;
    342 		lifetime = &ifr6.ifr_ifru.ifru_lifetime;
    343 		if (prog_ioctl(s, SIOCGIFALIFETIME_IN6, &ifr6) == -1) {
    344 			if (errno != EADDRNOTAVAIL)
    345 				warn("SIOCGIFALIFETIME_IN6");
    346 		} else if (lifetime->ia6t_preferred || lifetime->ia6t_expire) {
    347 			time_t t = time(NULL);
    348 			printf(" pltime ");
    349 			if (lifetime->ia6t_preferred) {
    350 				printf("%lu",
    351 				    (unsigned long)(lifetime->ia6t_preferred -
    352 				        MIN(t, lifetime->ia6t_preferred)));
    353 			} else
    354 				printf("infty");
    355 
    356 			printf(" vltime ");
    357 			if (lifetime->ia6t_expire) {
    358 				printf("%lu",
    359 				    (unsigned long)(lifetime->ia6t_expire -
    360 				        MIN(t, lifetime->ia6t_expire)));
    361 			} else
    362 				printf("infty");
    363 		}
    364 	}
    365 }
    366 
    367 static void
    368 in6_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force)
    369 {
    370 	struct ifaddrs *ifap, *ifa;
    371 	struct in6_ifreq ifr;
    372 	const char *ifname;
    373 	bool printprefs = false;
    374 
    375 	if ((ifname = getifname(env)) == NULL)
    376 		err(EXIT_FAILURE, "%s: getifname", __func__);
    377 
    378 	if (getifaddrs(&ifap) != 0)
    379 		err(EXIT_FAILURE, "getifaddrs");
    380 	printprefs = ifa_any_preferences(ifname, ifap, AF_INET6);
    381 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
    382 		if (strcmp(ifname, ifa->ifa_name) != 0)
    383 			continue;
    384 		if (ifa->ifa_addr->sa_family != AF_INET6)
    385 			continue;
    386 		if (sizeof(ifr.ifr_addr) < ifa->ifa_addr->sa_len)
    387 			continue;
    388 
    389 		memset(&ifr, 0, sizeof(ifr));
    390 		estrlcpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
    391 		memcpy(&ifr.ifr_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len);
    392 		in6_alias(ifname, env, oenv, &ifr);
    393 		if (printprefs)
    394 			ifa_print_preference(ifa->ifa_name, ifa->ifa_addr);
    395 		printf("\n");
    396 	}
    397 	freeifaddrs(ifap);
    398 }
    399 
    400 static int
    401 in6_pre_aifaddr(prop_dictionary_t env, const struct afparam *param)
    402 {
    403 	struct in6_aliasreq *ifra = param->req.buf;
    404 
    405 	setia6eui64_impl(env, ifra);
    406 	setia6vltime_impl(env, ifra);
    407 	setia6pltime_impl(env, ifra);
    408 	setia6flags_impl(env, ifra);
    409 	inet6_putscopeid(&ifra->ifra_addr, INET6_IS_ADDR_LINKLOCAL);
    410 	inet6_putscopeid(&ifra->ifra_dstaddr, INET6_IS_ADDR_LINKLOCAL);
    411 
    412 	return 0;
    413 }
    414 
    415 static void
    416 in6_commit_address(prop_dictionary_t env, prop_dictionary_t oenv)
    417 {
    418 	struct in6_ifreq in6_ifr = {
    419 		.ifr_addr = {
    420 			.sin6_family = AF_INET6,
    421 			.sin6_len = sizeof(in6_ifr.ifr_addr),
    422 			.sin6_addr = {
    423 				.s6_addr =
    424 				    {0xff, 0xff, 0xff, 0xff,
    425 				     0xff, 0xff, 0xff, 0xff}
    426 			}
    427 		}
    428 	};
    429 	static struct sockaddr_in6 in6_defmask = {
    430 		.sin6_family = AF_INET6,
    431 		.sin6_len = sizeof(in6_defmask),
    432 		.sin6_addr = {
    433 			.s6_addr = {0xff, 0xff, 0xff, 0xff,
    434 			            0xff, 0xff, 0xff, 0xff}
    435 		}
    436 	};
    437 
    438 	struct in6_aliasreq in6_ifra = {
    439 		.ifra_prefixmask = {
    440 			.sin6_family = AF_INET6,
    441 			.sin6_len = sizeof(in6_ifra.ifra_prefixmask),
    442 			.sin6_addr = {
    443 				.s6_addr =
    444 				    {0xff, 0xff, 0xff, 0xff,
    445 				     0xff, 0xff, 0xff, 0xff}}},
    446 		.ifra_lifetime = {
    447 			  .ia6t_pltime = ND6_INFINITE_LIFETIME
    448 			, .ia6t_vltime = ND6_INFINITE_LIFETIME
    449 		}
    450 	};
    451 	struct afparam in6param = {
    452 		  .req = BUFPARAM(in6_ifra)
    453 		, .dgreq = BUFPARAM(in6_ifr)
    454 		, .name = {
    455 			{.buf = in6_ifr.ifr_name,
    456 			 .buflen = sizeof(in6_ifr.ifr_name)},
    457 			{.buf = in6_ifra.ifra_name,
    458 			 .buflen = sizeof(in6_ifra.ifra_name)}
    459 		  }
    460 		, .dgaddr = BUFPARAM(in6_ifr.ifr_addr)
    461 		, .addr = BUFPARAM(in6_ifra.ifra_addr)
    462 		, .dst = BUFPARAM(in6_ifra.ifra_dstaddr)
    463 		, .brd = BUFPARAM(in6_ifra.ifra_broadaddr)
    464 		, .mask = BUFPARAM(in6_ifra.ifra_prefixmask)
    465 		, .aifaddr = IFADDR_PARAM(SIOCAIFADDR_IN6)
    466 		, .difaddr = IFADDR_PARAM(SIOCDIFADDR_IN6)
    467 		, .gifaddr = IFADDR_PARAM(SIOCGIFADDR_IN6)
    468 		, .defmask = BUFPARAM(in6_defmask)
    469 		, .pre_aifaddr = in6_pre_aifaddr
    470 	};
    471 	commit_address(env, oenv, &in6param);
    472 }
    473 
    474 static void
    475 in6_usage(prop_dictionary_t env)
    476 {
    477 	fprintf(stderr,
    478 	    "\t[ anycast | -anycast ] [ deprecated | -deprecated ]\n"
    479 	    "\t[ tentative | -tentative ] [ pltime n ] [ vltime n ] "
    480 	    "[ eui64 ]\n");
    481 }
    482 
    483 static void
    484 in6_constructor(void)
    485 {
    486 	if (register_flag('L') != 0)
    487 		err(EXIT_FAILURE, __func__);
    488 	register_family(&in6af);
    489 	usage_func_init(&usage, in6_usage);
    490 	register_usage(&usage);
    491 	cmdloop_branch_init(&branch[0], &ia6flags.pk_parser);
    492 	cmdloop_branch_init(&branch[1], &inet6.pk_parser);
    493 	register_cmdloop_branch(&branch[0]);
    494 	register_cmdloop_branch(&branch[1]);
    495 }
    496