xref: /dragonfly/usr.sbin/rtadvd/config.c (revision cf8b8947)
1 /*	$FreeBSD: stable/10/usr.sbin/rtadvd/config.c 254955 2013-08-27 11:50:33Z hrs $	*/
2 /*	$KAME: config.c,v 1.84 2003/08/05 12:34:23 itojun Exp $	*/
3 
4 /*
5  * Copyright (C) 1998 WIDE Project.
6  * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. Neither the name of the project nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #include <sys/param.h>
35 #include <sys/ioctl.h>
36 #include <sys/socket.h>
37 
38 #include <net/if.h>
39 #include <net/if_var.h>
40 #include <net/route.h>
41 #include <net/if_dl.h>
42 
43 #include <netinet/in.h>
44 #include <netinet/in_var.h>
45 #include <netinet/ip6.h>
46 #include <netinet6/ip6_var.h>
47 #include <netinet/icmp6.h>
48 #include <netinet6/nd6.h>
49 
50 #include <arpa/inet.h>
51 
52 #include <stdio.h>
53 #include <syslog.h>
54 #include <errno.h>
55 #include <inttypes.h>
56 #include <netdb.h>
57 #include <string.h>
58 #include <search.h>
59 #include <stdlib.h>
60 #include <time.h>
61 #include <unistd.h>
62 #include <ifaddrs.h>
63 
64 #include "rtadvd.h"
65 #include "advcap.h"
66 #include "timer.h"
67 #include "if.h"
68 #include "config.h"
69 
70 /* label of tcapcode + number + domain name + zero octet */
71 static char entbuf[10 + 3 + NI_MAXHOST + 1];
72 static char oentbuf[10 + 3 + NI_MAXHOST + 1];
73 static char abuf[DNAME_LABELENC_MAXLEN];
74 
75 static time_t prefix_timo = (60 * 120);	/* 2 hours.
76 					 * XXX: should be configurable. */
77 
78 static struct rtadvd_timer *prefix_timeout(void *);
79 static void makeentry(char *, size_t, int, const char *);
80 static size_t dname_labelenc(char *, const char *);
81 
82 /* Encode domain name label encoding in RFC 1035 Section 3.1 */
83 static size_t
dname_labelenc(char * dst,const char * src)84 dname_labelenc(char *dst, const char *src)
85 {
86 	char *dst_origin;
87 	char *p;
88 	size_t len;
89 
90 	dst_origin = dst;
91 	len = strlen(src);
92 
93 	/* Length fields per 63 octets + '\0' (<= DNAME_LABELENC_MAXLEN) */
94 	memset(dst, 0, len + len / 64 + 1 + 1);
95 
96 	syslog(LOG_DEBUG, "<%s> labelenc = %s", __func__, src);
97 	while (src && (len = strlen(src)) != 0) {
98 		/* Put a length field with 63 octet limitation first. */
99 		p = strchr(src, '.');
100 		if (p == NULL)
101 			*dst++ = len = MIN(63, len);
102 		else
103 			*dst++ = len = MIN(63, p - src);
104 		/* Copy 63 octets at most. */
105 		memcpy(dst, src, len);
106 		dst += len;
107 		if (p == NULL) /* the last label */
108 			break;
109 		src = p + 1;
110 	}
111 	/* Always need a 0-length label at the tail. */
112 	*dst++ = '\0';
113 
114 	syslog(LOG_DEBUG, "<%s> labellen = %td", __func__, dst - dst_origin);
115 	return (dst - dst_origin);
116 }
117 
118 #define	MUSTHAVE(var, cap)						\
119     do {								\
120 	int64_t t;							\
121 	if ((t = agetnum(cap)) < 0) {					\
122 		fprintf(stderr, "rtadvd: need %s for interface %s\n",	\
123 			cap, intface);					\
124 		exit(1);						\
125 	}								\
126 	var = t;							\
127      } while (0)
128 
129 #define	MAYHAVE(var, cap, def)						\
130      do {								\
131 	if ((var = agetnum(cap)) < 0)					\
132 		var = def;						\
133      } while (0)
134 
135 int
loadconfig_index(int idx)136 loadconfig_index(int idx)
137 {
138 	char ifname[IFNAMSIZ];
139 
140 	syslog(LOG_DEBUG, "<%s> enter", __func__);
141 
142 	if (if_indextoname(idx, ifname) != NULL)
143 		return (loadconfig_ifname(ifname));
144 	else
145 		return (1);
146 }
147 
148 int
loadconfig_ifname(char * ifname)149 loadconfig_ifname(char *ifname)
150 {
151 	struct ifinfo *ifi;
152 
153 	syslog(LOG_DEBUG, "<%s> enter", __func__);
154 
155 	update_ifinfo(&ifilist, UPDATE_IFINFO_ALL);
156 	TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
157 		/* NULL means all IFs will be processed. */
158 		if (ifname != NULL &&
159 		    strcmp(ifi->ifi_ifname, ifname) != 0)
160 			continue;
161 
162 		if (!ifi->ifi_persist) {
163 			syslog(LOG_INFO,
164 			    "<%s> %s is not a target interface.  "
165 			    "Ignored at this moment.", __func__,
166 			    ifi->ifi_ifname);
167 			continue;
168 
169 		}
170 		if (ifi->ifi_ifindex == 0) {
171 			syslog(LOG_ERR,
172 			    "<%s> %s not found.  "
173 			    "Ignored at this moment.", __func__,
174 			    ifi->ifi_ifname);
175 			continue;
176 		}
177 		if (getconfig(ifi) == NULL) {
178 			syslog(LOG_ERR,
179 			    "<%s> invalid configuration for %s.  "
180 			    "Ignored at this moment.", __func__,
181 			    ifi->ifi_ifname);
182 			continue;
183 		}
184 	}
185 	return (0);
186 }
187 
188 int
rm_ifinfo_index(int idx)189 rm_ifinfo_index(int idx)
190 {
191 	struct ifinfo *ifi;
192 
193 	ifi = if_indextoifinfo(idx);
194 	if (ifi == NULL) {
195 		syslog(LOG_ERR, "<%s>: ifinfo not found (idx=%d)",
196 		    __func__, idx);
197 		return (-1);
198 	}
199 
200 	return (rm_ifinfo(ifi));
201 }
202 
203 int
rm_ifinfo(struct ifinfo * ifi)204 rm_ifinfo(struct ifinfo *ifi)
205 {
206 	int error;
207 
208 	syslog(LOG_DEBUG, "<%s> enter (%s).", __func__, ifi->ifi_ifname);
209 	switch (ifi->ifi_state) {
210 	case IFI_STATE_UNCONFIGURED:
211 		return (0);
212 		break;
213 	default:
214 		ifi->ifi_state = IFI_STATE_UNCONFIGURED;
215 		syslog(LOG_DEBUG,
216 		    "<%s> ifname=%s marked as UNCONFIGURED.",
217 		    __func__, ifi->ifi_ifname);
218 
219 		/* XXX: No MC leaving here because index is disappeared */
220 
221 		/* Inactivate timer */
222 		rtadvd_remove_timer(ifi->ifi_ra_timer);
223 		ifi->ifi_ra_timer = NULL;
224 		break;
225 	}
226 
227 	/* clean up ifi */
228 	if (!ifi->ifi_persist) {
229 		TAILQ_REMOVE(&ifilist, ifi, ifi_next);
230 		syslog(LOG_DEBUG, "<%s>: ifinfo (idx=%d) removed.",
231 		    __func__, ifi->ifi_ifindex);
232 		free(ifi);
233 	} else {
234 		/* recreate an empty entry */
235 		update_persist_ifinfo(&ifilist, ifi->ifi_ifname);
236 		syslog(LOG_DEBUG, "<%s>: ifname=%s is persistent.",
237 		    __func__, ifi->ifi_ifname);
238 	}
239 
240 	/* clean up rai if any */
241 	switch (ifi->ifi_state) {
242 	case IFI_STATE_CONFIGURED:
243 		if (ifi->ifi_rainfo != NULL) {
244 			error = rm_rainfo(ifi->ifi_rainfo);
245 			if (error)
246 				return (error);
247 			ifi->ifi_rainfo = NULL;
248 		}
249 		break;
250 	case IFI_STATE_TRANSITIVE:
251 		if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) {
252 			if (ifi->ifi_rainfo != NULL) {
253 				error = rm_rainfo(ifi->ifi_rainfo);
254 				if (error)
255 					return (error);
256 				ifi->ifi_rainfo = NULL;
257 				ifi->ifi_rainfo_trans = NULL;
258 			}
259 		} else {
260 			if (ifi->ifi_rainfo != NULL) {
261 				error = rm_rainfo(ifi->ifi_rainfo);
262 				if (error)
263 					return (error);
264 				ifi->ifi_rainfo = NULL;
265 			}
266 			if (ifi->ifi_rainfo_trans != NULL) {
267 				error = rm_rainfo(ifi->ifi_rainfo_trans);
268 				if (error)
269 					return (error);
270 				ifi->ifi_rainfo_trans = NULL;
271 			}
272 		}
273 	}
274 
275 	syslog(LOG_DEBUG, "<%s> leave (%s).", __func__, ifi->ifi_ifname);
276 	return (0);
277 }
278 
279 int
rm_rainfo(struct rainfo * rai)280 rm_rainfo(struct rainfo *rai)
281 {
282 	struct prefix *pfx;
283 	struct soliciter *sol;
284 	struct rdnss *rdn;
285 	struct rdnss_addr *rdna;
286 	struct dnssl *dns;
287 	struct rtinfo *rti;
288 
289 	syslog(LOG_DEBUG, "<%s>: enter",  __func__);
290 
291 	TAILQ_REMOVE(&railist, rai, rai_next);
292 	if (rai->rai_ifinfo != NULL)
293 		syslog(LOG_DEBUG, "<%s>: rainfo (idx=%d) removed.",
294 		    __func__, rai->rai_ifinfo->ifi_ifindex);
295 
296 	if (rai->rai_ra_data != NULL)
297 		free(rai->rai_ra_data);
298 
299 	while ((pfx = TAILQ_FIRST(&rai->rai_prefix)) != NULL)
300 		delete_prefix(pfx);
301 	while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) {
302 		TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next);
303 		free(sol);
304 	}
305 	while ((rdn = TAILQ_FIRST(&rai->rai_rdnss)) != NULL) {
306 		TAILQ_REMOVE(&rai->rai_rdnss, rdn, rd_next);
307 		while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) {
308 			TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next);
309 			free(rdna);
310 		}
311 		free(rdn);
312 	}
313 	while ((dns = TAILQ_FIRST(&rai->rai_dnssl)) != NULL) {
314 		TAILQ_REMOVE(&rai->rai_dnssl, dns, dn_next);
315 		free(dns);
316 	}
317 	while ((rti = TAILQ_FIRST(&rai->rai_route)) != NULL) {
318 		TAILQ_REMOVE(&rai->rai_route, rti, rti_next);
319 		free(rti);
320 	}
321 	free(rai);
322 	syslog(LOG_DEBUG, "<%s>: leave",  __func__);
323 
324 	return (0);
325 }
326 
327 struct ifinfo *
getconfig(struct ifinfo * ifi)328 getconfig(struct ifinfo *ifi)
329 {
330 	int stat, i;
331 	int error;
332 	char tbuf[BUFSIZ];
333 	struct rainfo *rai;
334 	struct rainfo *rai_old;
335 	int32_t val;
336 	int64_t val64;
337 	char buf[BUFSIZ];
338 	char *bp = buf;
339 	char *addr, *flagstr;
340 
341 	if (ifi == NULL)	/* if does not exist */
342 		return (NULL);
343 
344 	if (ifi->ifi_state == IFI_STATE_TRANSITIVE &&
345 	    ifi->ifi_rainfo == NULL) {
346 		syslog(LOG_INFO, "<%s> %s is shutting down.  Skipped.",
347 		    __func__, ifi->ifi_ifname);
348 		return (NULL);
349 	}
350 
351 	if ((stat = agetent(tbuf, ifi->ifi_ifname)) <= 0) {
352 		memset(tbuf, 0, sizeof(tbuf));
353 		syslog(LOG_INFO,
354 		    "<%s> %s isn't defined in the configuration file"
355 		    " or the configuration file doesn't exist."
356 		    " Treat it as default",
357 		     __func__, ifi->ifi_ifname);
358 	}
359 
360 	ELM_MALLOC(rai, exit(1));
361 	TAILQ_INIT(&rai->rai_prefix);
362 	TAILQ_INIT(&rai->rai_route);
363 	TAILQ_INIT(&rai->rai_rdnss);
364 	TAILQ_INIT(&rai->rai_dnssl);
365 	TAILQ_INIT(&rai->rai_soliciter);
366 	rai->rai_ifinfo = ifi;
367 
368 	/* gather on-link prefixes from the network interfaces. */
369 	if (agetflag("noifprefix"))
370 		rai->rai_advifprefix = 0;
371 	else
372 		rai->rai_advifprefix = 1;
373 
374 	/* get interface information */
375 	if (agetflag("nolladdr"))
376 		rai->rai_advlinkopt = 0;
377 	else
378 		rai->rai_advlinkopt = 1;
379 	if (rai->rai_advlinkopt) {
380 		if (ifi->ifi_sdl.sdl_type == 0) {
381 			syslog(LOG_ERR,
382 			    "<%s> can't get information of %s",
383 			    __func__, ifi->ifi_ifname);
384 			goto getconfig_free_rai;
385 		}
386 	}
387 
388 	/*
389 	 * set router configuration variables.
390 	 */
391 	MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL);
392 	if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) {
393 		syslog(LOG_ERR,
394 		    "<%s> maxinterval (%" PRIu32 ") on %s is invalid "
395 		    "(must be between %u and %u)", __func__, val,
396 		    ifi->ifi_ifname, MIN_MAXINTERVAL, MAX_MAXINTERVAL);
397 		goto getconfig_free_rai;
398 	}
399 	rai->rai_maxinterval = (uint16_t)val;
400 
401 	MAYHAVE(val, "mininterval", rai->rai_maxinterval/3);
402 	if ((uint16_t)val < MIN_MININTERVAL ||
403 	    (uint16_t)val > (rai->rai_maxinterval * 3) / 4) {
404 		syslog(LOG_ERR,
405 		    "<%s> mininterval (%" PRIu32 ") on %s is invalid "
406 		    "(must be between %d and %d)",
407 		    __func__, val, ifi->ifi_ifname, MIN_MININTERVAL,
408 		    (rai->rai_maxinterval * 3) / 4);
409 		goto getconfig_free_rai;
410 	}
411 	rai->rai_mininterval = (uint16_t)val;
412 
413 	MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT);
414 	rai->rai_hoplimit = val & 0xff;
415 
416 	if ((flagstr = (char *)agetstr("raflags", &bp))) {
417 		val = 0;
418 		if (strchr(flagstr, 'm'))
419 			val |= ND_RA_FLAG_MANAGED;
420 		if (strchr(flagstr, 'o'))
421 			val |= ND_RA_FLAG_OTHER;
422 		if (strchr(flagstr, 'h'))
423 			val |= ND_RA_FLAG_RTPREF_HIGH;
424 		if (strchr(flagstr, 'l')) {
425 			if ((val & ND_RA_FLAG_RTPREF_HIGH)) {
426 				syslog(LOG_ERR, "<%s> the \'h\' and \'l\'"
427 				    " router flags are exclusive", __func__);
428 				goto getconfig_free_rai;
429 			}
430 			val |= ND_RA_FLAG_RTPREF_LOW;
431 		}
432 	} else
433 		MAYHAVE(val, "raflags", 0);
434 
435 	rai->rai_managedflg = val & ND_RA_FLAG_MANAGED;
436 	rai->rai_otherflg = val & ND_RA_FLAG_OTHER;
437 #ifndef ND_RA_FLAG_RTPREF_MASK
438 #define ND_RA_FLAG_RTPREF_MASK	0x18 /* 00011000 */
439 #define ND_RA_FLAG_RTPREF_RSV	0x10 /* 00010000 */
440 #endif
441 	rai->rai_rtpref = val & ND_RA_FLAG_RTPREF_MASK;
442 	if (rai->rai_rtpref == ND_RA_FLAG_RTPREF_RSV) {
443 		syslog(LOG_ERR, "<%s> invalid router preference (%02x) on %s",
444 		    __func__, rai->rai_rtpref, ifi->ifi_ifname);
445 		goto getconfig_free_rai;
446 	}
447 
448 	MAYHAVE(val, "rltime", rai->rai_maxinterval * 3);
449 	if ((uint16_t)val && ((uint16_t)val < rai->rai_maxinterval ||
450 	    (uint16_t)val > MAXROUTERLIFETIME)) {
451 		syslog(LOG_ERR,
452 		    "<%s> router lifetime (%" PRIu32 ") on %s is invalid "
453 		    "(must be 0 or between %d and %d)",
454 		    __func__, val, ifi->ifi_ifname, rai->rai_maxinterval,
455 		    MAXROUTERLIFETIME);
456 		goto getconfig_free_rai;
457 	}
458 	rai->rai_lifetime = val & 0xffff;
459 
460 	MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME);
461 	if (val < 0 || val > MAXREACHABLETIME) {
462 		syslog(LOG_ERR,
463 		    "<%s> reachable time (%" PRIu32 ") on %s is invalid "
464 		    "(must be no greater than %d)",
465 		    __func__, val, ifi->ifi_ifname, MAXREACHABLETIME);
466 		goto getconfig_free_rai;
467 	}
468 	rai->rai_reachabletime = (uint32_t)val;
469 
470 	MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER);
471 	if (val64 < 0 || val64 > 0xffffffff) {
472 		syslog(LOG_ERR, "<%s> retrans time (%" PRIu64 ") on %s out of range",
473 		    __func__, val64, ifi->ifi_ifname);
474 		goto getconfig_free_rai;
475 	}
476 	rai->rai_retranstimer = (uint32_t)val64;
477 
478 	if (agetnum("hapref") != -1 || agetnum("hatime") != -1) {
479 		syslog(LOG_ERR,
480 		    "<%s> mobile-ip6 configuration not supported",
481 		    __func__);
482 		goto getconfig_free_rai;
483 	}
484 	/* prefix information */
485 
486 	/*
487 	 * This is an implementation specific parameter to consider
488 	 * link propagation delays and poorly synchronized clocks when
489 	 * checking consistency of advertised lifetimes.
490 	 */
491 	MAYHAVE(val, "clockskew", 0);
492 	rai->rai_clockskew = val;
493 
494 	rai->rai_pfxs = 0;
495 	for (i = -1; i < MAXPREFIX; i++) {
496 		struct prefix *pfx;
497 
498 		makeentry(entbuf, sizeof(entbuf), i, "addr");
499 		addr = (char *)agetstr(entbuf, &bp);
500 		if (addr == NULL)
501 			continue;
502 
503 		/* allocate memory to store prefix information */
504 		ELM_MALLOC(pfx, exit(1));
505 		pfx->pfx_rainfo = rai;
506 		pfx->pfx_origin = PREFIX_FROM_CONFIG;
507 
508 		if (inet_pton(AF_INET6, addr, &pfx->pfx_prefix) != 1) {
509 			syslog(LOG_ERR,
510 			    "<%s> inet_pton failed for %s",
511 			    __func__, addr);
512 			goto getconfig_free_pfx;
513 		}
514 		if (IN6_IS_ADDR_MULTICAST(&pfx->pfx_prefix)) {
515 			syslog(LOG_ERR,
516 			    "<%s> multicast prefix (%s) must "
517 			    "not be advertised on %s",
518 			    __func__, addr, ifi->ifi_ifname);
519 			goto getconfig_free_pfx;
520 		}
521 		if (IN6_IS_ADDR_LINKLOCAL(&pfx->pfx_prefix))
522 			syslog(LOG_NOTICE,
523 			    "<%s> link-local prefix (%s) will be"
524 			    " advertised on %s",
525 			    __func__, addr, ifi->ifi_ifname);
526 
527 		makeentry(entbuf, sizeof(entbuf), i, "prefixlen");
528 		MAYHAVE(val, entbuf, 64);
529 		if (val < 0 || val > 128) {
530 			syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s "
531 			    "on %s out of range",
532 			    __func__, val, addr, ifi->ifi_ifname);
533 			goto getconfig_free_pfx;
534 		}
535 		pfx->pfx_prefixlen = (int)val;
536 
537 		makeentry(entbuf, sizeof(entbuf), i, "pinfoflags");
538 		if ((flagstr = (char *)agetstr(entbuf, &bp))) {
539 			val = 0;
540 			if (strchr(flagstr, 'l'))
541 				val |= ND_OPT_PI_FLAG_ONLINK;
542 			if (strchr(flagstr, 'a'))
543 				val |= ND_OPT_PI_FLAG_AUTO;
544 		} else {
545 			MAYHAVE(val, entbuf,
546 			    (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO));
547 		}
548 		pfx->pfx_onlinkflg = val & ND_OPT_PI_FLAG_ONLINK;
549 		pfx->pfx_autoconfflg = val & ND_OPT_PI_FLAG_AUTO;
550 
551 		makeentry(entbuf, sizeof(entbuf), i, "vltime");
552 		MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
553 		if (val64 < 0 || val64 > 0xffffffff) {
554 			syslog(LOG_ERR, "<%s> vltime (%" PRIu64 ") for "
555 			    "%s/%d on %s is out of range",
556 			    __func__, val64,
557 			    addr, pfx->pfx_prefixlen, ifi->ifi_ifname);
558 			goto getconfig_free_pfx;
559 		}
560 		pfx->pfx_validlifetime = (uint32_t)val64;
561 
562 		makeentry(entbuf, sizeof(entbuf), i, "vltimedecr");
563 		if (agetflag(entbuf)) {
564 			struct timespec now;
565 
566 			clock_gettime(CLOCK_MONOTONIC_FAST, &now);
567 			pfx->pfx_vltimeexpire =
568 				now.tv_sec + pfx->pfx_validlifetime;
569 		}
570 
571 		makeentry(entbuf, sizeof(entbuf), i, "pltime");
572 		MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME);
573 		if (val64 < 0 || val64 > 0xffffffff) {
574 			syslog(LOG_ERR,
575 			    "<%s> pltime (%" PRIu64 ") for %s/%d on %s "
576 			    "is out of range",
577 			    __func__, val64,
578 			    addr, pfx->pfx_prefixlen, ifi->ifi_ifname);
579 			goto getconfig_free_pfx;
580 		}
581 		pfx->pfx_preflifetime = (uint32_t)val64;
582 
583 		makeentry(entbuf, sizeof(entbuf), i, "pltimedecr");
584 		if (agetflag(entbuf)) {
585 			struct timespec now;
586 
587 			clock_gettime(CLOCK_MONOTONIC_FAST, &now);
588 			pfx->pfx_pltimeexpire =
589 			    now.tv_sec + pfx->pfx_preflifetime;
590 		}
591 		/* link into chain */
592 		TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next);
593 		rai->rai_pfxs++;
594 		continue;
595 getconfig_free_pfx:
596 		free(pfx);
597 	}
598 	if (rai->rai_advifprefix && rai->rai_pfxs == 0)
599 		get_prefix(rai);
600 
601 	MAYHAVE(val64, "mtu", 0);
602 	if (val < 0 || val64 > 0xffffffff) {
603 		syslog(LOG_ERR,
604 		    "<%s> mtu (%" PRIu64 ") on %s out of range",
605 		    __func__, val64, ifi->ifi_ifname);
606 		goto getconfig_free_rai;
607 	}
608 	rai->rai_linkmtu = (uint32_t)val64;
609 	if (rai->rai_linkmtu == 0) {
610 		char *mtustr;
611 
612 		if ((mtustr = (char *)agetstr("mtu", &bp)) &&
613 		    strcmp(mtustr, "auto") == 0)
614 			rai->rai_linkmtu = ifi->ifi_phymtu;
615 	}
616 	else if (rai->rai_linkmtu < IPV6_MMTU ||
617 	    rai->rai_linkmtu > ifi->ifi_phymtu) {
618 		syslog(LOG_ERR,
619 		    "<%s> advertised link mtu (%" PRIu32 ") on %s is invalid (must "
620 		    "be between least MTU (%d) and physical link MTU (%d)",
621 		    __func__, rai->rai_linkmtu, ifi->ifi_ifname,
622 		    IPV6_MMTU, ifi->ifi_phymtu);
623 		goto getconfig_free_rai;
624 	}
625 
626 #ifdef SIOCSIFINFO_IN6
627 	{
628 		struct in6_ndireq ndi;
629 		int s;
630 
631 		if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
632 			syslog(LOG_ERR, "<%s> socket: %s", __func__,
633 			    strerror(errno));
634 			exit(1);
635 		}
636 		memset(&ndi, 0, sizeof(ndi));
637 		strncpy(ndi.ifname, ifi->ifi_ifname, sizeof(ndi.ifname));
638 		if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&ndi) < 0)
639 			syslog(LOG_INFO, "<%s> ioctl:SIOCGIFINFO_IN6 at %s: %s",
640 			    __func__, ifi->ifi_ifname, strerror(errno));
641 
642 		/* reflect the RA info to the host variables in kernel */
643 		ndi.ndi.chlim = rai->rai_hoplimit;
644 		ndi.ndi.retrans = rai->rai_retranstimer;
645 		ndi.ndi.basereachable = rai->rai_reachabletime;
646 		if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&ndi) < 0)
647 			syslog(LOG_INFO, "<%s> ioctl:SIOCSIFINFO_IN6 at %s: %s",
648 			    __func__, ifi->ifi_ifname, strerror(errno));
649 
650 		close(s);
651 	}
652 #endif
653 
654 	/* route information */
655 	rai->rai_routes = 0;
656 	for (i = -1; i < MAXROUTE; i++) {
657 		struct rtinfo *rti;
658 
659 		makeentry(entbuf, sizeof(entbuf), i, "rtprefix");
660 		addr = (char *)agetstr(entbuf, &bp);
661 		if (addr == NULL) {
662 			makeentry(oentbuf, sizeof(oentbuf), i, "rtrprefix");
663 			addr = (char *)agetstr(oentbuf, &bp);
664 			if (addr)
665 				fprintf(stderr, "%s was obsoleted.  Use %s.\n",
666 				    oentbuf, entbuf);
667 		}
668 		if (addr == NULL)
669 			continue;
670 
671 		/* allocate memory to store prefix information */
672 		ELM_MALLOC(rti, exit(1));
673 
674 		if (inet_pton(AF_INET6, addr, &rti->rti_prefix) != 1) {
675 			syslog(LOG_ERR, "<%s> inet_pton failed for %s",
676 			    __func__, addr);
677 			goto getconfig_free_rti;
678 		}
679 #if 0
680 		/*
681 		 * XXX: currently there's no restriction in route information
682 		 * prefix according to
683 		 * draft-ietf-ipngwg-router-selection-00.txt.
684 		 * However, I think the similar restriction be necessary.
685 		 */
686 		MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
687 		if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) {
688 			syslog(LOG_ERR,
689 			    "<%s> multicast route (%s) must "
690 			    "not be advertised on %s",
691 			    __func__, addr, ifi->ifi_ifname);
692 			goto getconfig_free_rti;
693 		}
694 		if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) {
695 			syslog(LOG_NOTICE,
696 			    "<%s> link-local route (%s) will "
697 			    "be advertised on %s",
698 			    __func__, addr, ifi->ifi_ifname);
699 			goto getconfig_free_rti;
700 		}
701 #endif
702 
703 		makeentry(entbuf, sizeof(entbuf), i, "rtplen");
704 		/* XXX: 256 is a magic number for compatibility check. */
705 		MAYHAVE(val, entbuf, 256);
706 		if (val == 256) {
707 			makeentry(oentbuf, sizeof(oentbuf), i, "rtrplen");
708 			MAYHAVE(val, oentbuf, 256);
709 			if (val != 256)
710 				fprintf(stderr, "%s was obsoleted.  Use %s.\n",
711 				    oentbuf, entbuf);
712 			else
713 				val = 64;
714 		}
715 		if (val < 0 || val > 128) {
716 			syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s on %s "
717 			    "out of range",
718 			    __func__, val, addr, ifi->ifi_ifname);
719 			goto getconfig_free_rti;
720 		}
721 		rti->rti_prefixlen = (int)val;
722 
723 		makeentry(entbuf, sizeof(entbuf), i, "rtflags");
724 		if ((flagstr = (char *)agetstr(entbuf, &bp))) {
725 			val = 0;
726 			if (strchr(flagstr, 'h'))
727 				val |= ND_RA_FLAG_RTPREF_HIGH;
728 			if (strchr(flagstr, 'l')) {
729 				if ((val & ND_RA_FLAG_RTPREF_HIGH)) {
730 					syslog(LOG_ERR,
731 					    "<%s> the \'h\' and \'l\' route"
732 					    " preferences are exclusive",
733 					    __func__);
734 					goto getconfig_free_rti;
735 				}
736 				val |= ND_RA_FLAG_RTPREF_LOW;
737 			}
738 		} else
739 			MAYHAVE(val, entbuf, 256); /* XXX */
740 		if (val == 256) {
741 			makeentry(oentbuf, sizeof(oentbuf), i, "rtrflags");
742 			MAYHAVE(val, oentbuf, 256);
743 			if (val != 256) {
744 				fprintf(stderr, "%s was obsoleted.  Use %s.\n",
745 				    oentbuf, entbuf);
746 			} else
747 				val = 0;
748 		}
749 		rti->rti_rtpref = val & ND_RA_FLAG_RTPREF_MASK;
750 		if (rti->rti_rtpref == ND_RA_FLAG_RTPREF_RSV) {
751 			syslog(LOG_ERR, "<%s> invalid route preference (%02x) "
752 			    "for %s/%d on %s",
753 			    __func__, rti->rti_rtpref, addr,
754 			    rti->rti_prefixlen, ifi->ifi_ifname);
755 			goto getconfig_free_rti;
756 		}
757 
758 		/*
759 		 * Since the spec does not a default value, we should make
760 		 * this entry mandatory.  However, FreeBSD 4.4 has shipped
761 		 * with this field being optional, we use the router lifetime
762 		 * as an ad-hoc default value with a warning message.
763 		 */
764 		makeentry(entbuf, sizeof(entbuf), i, "rtltime");
765 		MAYHAVE(val64, entbuf, -1);
766 		if (val64 == -1) {
767 			makeentry(oentbuf, sizeof(oentbuf), i, "rtrltime");
768 			MAYHAVE(val64, oentbuf, -1);
769 			if (val64 != -1)
770 				fprintf(stderr, "%s was obsoleted.  Use %s.\n",
771 				    oentbuf, entbuf);
772 			else {
773 				fprintf(stderr, "%s should be specified "
774 				    "for interface %s.\n", entbuf,
775 				    ifi->ifi_ifname);
776 				val64 = rai->rai_lifetime;
777 			}
778 		}
779 		if (val64 < 0 || val64 > 0xffffffff) {
780 			syslog(LOG_ERR, "<%s> route lifetime (%" PRIu64 ") for "
781 			    "%s/%d on %s out of range", __func__,
782 			    val64, addr, rti->rti_prefixlen,
783 			    ifi->ifi_ifname);
784 			goto getconfig_free_rti;
785 		}
786 		rti->rti_ltime = (uint32_t)val64;
787 
788 		/* link into chain */
789 		TAILQ_INSERT_TAIL(&rai->rai_route, rti, rti_next);
790 		rai->rai_routes++;
791 		continue;
792 getconfig_free_rti:
793 		free(rti);
794 	}
795 
796 	/* DNS server and DNS search list information */
797 	for (i = -1; i < MAXRDNSSENT ; i++) {
798 		struct rdnss *rdn;
799 		struct rdnss_addr *rdna;
800 		char *ap;
801 		int c;
802 
803 		makeentry(entbuf, sizeof(entbuf), i, "rdnss");
804 		addr = (char *)agetstr(entbuf, &bp);
805 		if (addr == NULL)
806 			break;
807 		ELM_MALLOC(rdn, exit(1));
808 
809 		TAILQ_INIT(&rdn->rd_list);
810 
811 		for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) {
812 			c = strcspn(ap, ",");
813 			strncpy(abuf, ap, c);
814 			abuf[c] = '\0';
815 			ELM_MALLOC(rdna, goto getconfig_free_rdn);
816 			if (inet_pton(AF_INET6, abuf, &rdna->ra_dns) != 1) {
817 				syslog(LOG_ERR, "<%s> inet_pton failed for %s",
818 				    __func__, abuf);
819 				free(rdna);
820 				goto getconfig_free_rdn;
821 			}
822 			TAILQ_INSERT_TAIL(&rdn->rd_list, rdna, ra_next);
823 		}
824 
825 		makeentry(entbuf, sizeof(entbuf), i, "rdnssltime");
826 		MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2));
827 		if ((uint16_t)val < rai->rai_maxinterval ||
828 		    (uint16_t)val > rai->rai_maxinterval * 2) {
829 			syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid "
830 			    "(must be between %d and %d)",
831 			    entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval,
832 			    rai->rai_maxinterval * 2);
833 			goto getconfig_free_rdn;
834 		}
835 		rdn->rd_ltime = val;
836 
837 		/* link into chain */
838 		TAILQ_INSERT_TAIL(&rai->rai_rdnss, rdn, rd_next);
839 		continue;
840 getconfig_free_rdn:
841 		while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) {
842 			TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next);
843 			free(rdna);
844 		}
845 		free(rdn);
846 	}
847 
848 	for (i = -1; i < MAXDNSSLENT ; i++) {
849 		struct dnssl *dns;
850 		struct dnssl_addr *dnsa;
851 		char *ap;
852 		int c;
853 
854 		makeentry(entbuf, sizeof(entbuf), i, "dnssl");
855 		addr = (char *)agetstr(entbuf, &bp);
856 		if (addr == NULL)
857 			break;
858 
859 		ELM_MALLOC(dns, exit(1));
860 
861 		TAILQ_INIT(&dns->dn_list);
862 
863 		for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) {
864 			c = strcspn(ap, ",");
865 			strncpy(abuf, ap, c);
866 			abuf[c] = '\0';
867 			ELM_MALLOC(dnsa, goto getconfig_free_dns);
868 			dnsa->da_len = dname_labelenc(dnsa->da_dom, abuf);
869 			syslog(LOG_DEBUG, "<%s>: dnsa->da_len = %d", __func__,
870 			    dnsa->da_len);
871 			TAILQ_INSERT_TAIL(&dns->dn_list, dnsa, da_next);
872 		}
873 
874 		makeentry(entbuf, sizeof(entbuf), i, "dnsslltime");
875 		MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2));
876 		if ((uint16_t)val < rai->rai_maxinterval ||
877 		    (uint16_t)val > rai->rai_maxinterval * 2) {
878 			syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid "
879 			    "(must be between %d and %d)",
880 			    entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval,
881 			    rai->rai_maxinterval * 2);
882 			goto getconfig_free_dns;
883 		}
884 		dns->dn_ltime = val;
885 
886 		/* link into chain */
887 		TAILQ_INSERT_TAIL(&rai->rai_dnssl, dns, dn_next);
888 		continue;
889 getconfig_free_dns:
890 		while ((dnsa = TAILQ_FIRST(&dns->dn_list)) != NULL) {
891 			TAILQ_REMOVE(&dns->dn_list, dnsa, da_next);
892 			free(dnsa);
893 		}
894 		free(dns);
895 	}
896 	/* construct the sending packet */
897 	make_packet(rai);
898 
899 	/*
900 	 * If an entry with the same ifindex exists, remove it first.
901 	 * Before the removal, RDNSS and DNSSL options with
902 	 * zero-lifetime will be sent.
903 	 */
904 	switch (ifi->ifi_state) {
905 	case IFI_STATE_UNCONFIGURED:
906 		/* UNCONFIGURED -> TRANSITIVE */
907 
908 		error = sock_mc_join(&sock, ifi->ifi_ifindex);
909 		if (error)
910 			exit(1);
911 
912 		ifi->ifi_state = IFI_STATE_TRANSITIVE;
913 		ifi->ifi_burstcount = MAX_INITIAL_RTR_ADVERTISEMENTS;
914 		ifi->ifi_burstinterval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
915 
916 		/* The same two rai mean initial burst */
917 		ifi->ifi_rainfo = rai;
918 		ifi->ifi_rainfo_trans = rai;
919 		TAILQ_INSERT_TAIL(&railist, rai, rai_next);
920 
921 		if (ifi->ifi_ra_timer == NULL)
922 			ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
923 			    ra_timer_update, ifi, ifi);
924 		ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
925 		rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
926 		    ifi->ifi_ra_timer);
927 
928 		syslog(LOG_DEBUG,
929 		    "<%s> ifname=%s marked as TRANSITIVE (initial burst).",
930 		    __func__, ifi->ifi_ifname);
931 		break;
932 	case IFI_STATE_CONFIGURED:
933 		/* CONFIGURED -> TRANSITIVE */
934 		rai_old = ifi->ifi_rainfo;
935 		if (rai_old == NULL) {
936 			syslog(LOG_ERR,
937 			    "<%s> ifi_rainfo is NULL"
938 			    " in IFI_STATE_CONFIGURED.", __func__);
939 			ifi = NULL;
940 			break;
941 		} else {
942 			struct rdnss *rdn;
943 			struct dnssl *dns;
944 
945 			rai_old->rai_lifetime = 0;
946 			TAILQ_FOREACH(rdn, &rai_old->rai_rdnss, rd_next)
947 			    rdn->rd_ltime = 0;
948 			TAILQ_FOREACH(dns, &rai_old->rai_dnssl, dn_next)
949 			    dns->dn_ltime = 0;
950 
951 			ifi->ifi_rainfo_trans = rai_old;
952 			ifi->ifi_state = IFI_STATE_TRANSITIVE;
953 			ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS;
954 			ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS;
955 
956 			ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
957 			rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
958 			    ifi->ifi_ra_timer);
959 
960 			syslog(LOG_DEBUG,
961 			    "<%s> ifname=%s marked as TRANSITIVE"
962 			    " (transitional burst)",
963 			    __func__, ifi->ifi_ifname);
964 		}
965 		ifi->ifi_rainfo = rai;
966 		TAILQ_INSERT_TAIL(&railist, rai, rai_next);
967 		break;
968 	case IFI_STATE_TRANSITIVE:
969 		if (ifi->ifi_rainfo != NULL) {
970 			if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) {
971 				/* Reinitialize initial burst */
972 				rm_rainfo(ifi->ifi_rainfo);
973 				ifi->ifi_rainfo = rai;
974 				ifi->ifi_rainfo_trans = rai;
975 				ifi->ifi_burstcount =
976 				    MAX_INITIAL_RTR_ADVERTISEMENTS;
977 				ifi->ifi_burstinterval =
978 				    MAX_INITIAL_RTR_ADVERT_INTERVAL;
979 			} else {
980 				/* Replace ifi_rainfo with the new one */
981 				rm_rainfo(ifi->ifi_rainfo);
982 				ifi->ifi_rainfo = rai;
983 			}
984 			TAILQ_INSERT_TAIL(&railist, rai, rai_next);
985 
986 			ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
987 			rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
988 			    ifi->ifi_ra_timer);
989 		} else {
990 			/* XXX: NOTREACHED.  Being shut down. */
991 			syslog(LOG_ERR,
992 			    "<%s> %s is shutting down.  Skipped.",
993 			    __func__, ifi->ifi_ifname);
994 			rm_rainfo(rai);
995 
996 			return (NULL);
997 		}
998 		break;
999 	}
1000 
1001 	return (ifi);
1002 
1003 getconfig_free_rai:
1004 	free(rai);
1005 	return (NULL);
1006 }
1007 
1008 void
get_prefix(struct rainfo * rai)1009 get_prefix(struct rainfo *rai)
1010 {
1011 	struct ifaddrs *ifap, *ifa;
1012 	struct prefix *pfx;
1013 	struct in6_addr *a;
1014 	struct ifinfo *ifi;
1015 	char *p, *ep, *m, *lim;
1016 	char ntopbuf[INET6_ADDRSTRLEN];
1017 
1018 	if (getifaddrs(&ifap) < 0) {
1019 		syslog(LOG_ERR,
1020 		    "<%s> can't get interface addresses",
1021 		    __func__);
1022 		exit(1);
1023 	}
1024 	ifi = rai->rai_ifinfo;
1025 
1026 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1027 		int plen;
1028 
1029 		if (strcmp(ifa->ifa_name, ifi->ifi_ifname) != 0)
1030 			continue;
1031 		if (ifa->ifa_addr->sa_family != AF_INET6)
1032 			continue;
1033 		a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
1034 		if (IN6_IS_ADDR_LINKLOCAL(a))
1035 			continue;
1036 
1037 		/* get prefix length */
1038 		m = (char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
1039 		lim = (char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len;
1040 		plen = prefixlen(m, lim);
1041 		if (plen <= 0 || plen > 128) {
1042 			syslog(LOG_ERR, "<%s> failed to get prefixlen "
1043 			    "or prefix is invalid",
1044 			    __func__);
1045 			exit(1);
1046 		}
1047 		if (plen == 128)	/* XXX */
1048 			continue;
1049 		if (find_prefix(rai, a, plen)) {
1050 			/* ignore a duplicated prefix. */
1051 			continue;
1052 		}
1053 
1054 		/* allocate memory to store prefix info. */
1055 		ELM_MALLOC(pfx, exit(1));
1056 
1057 		/* set prefix, sweep bits outside of prefixlen */
1058 		pfx->pfx_prefixlen = plen;
1059 		memcpy(&pfx->pfx_prefix, a, sizeof(*a));
1060 		p = (char *)&pfx->pfx_prefix;
1061 		ep = (char *)(&pfx->pfx_prefix + 1);
1062 		while (m < lim && p < ep)
1063 			*p++ &= *m++;
1064 		while (p < ep)
1065 			*p++ = 0x00;
1066 	        if (!inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf,
1067 	            sizeof(ntopbuf))) {
1068 			syslog(LOG_ERR, "<%s> inet_ntop failed", __func__);
1069 			exit(1);
1070 		}
1071 		syslog(LOG_DEBUG,
1072 		    "<%s> add %s/%d to prefix list on %s",
1073 		    __func__, ntopbuf, pfx->pfx_prefixlen, ifi->ifi_ifname);
1074 
1075 		/* set other fields with protocol defaults */
1076 		pfx->pfx_validlifetime = DEF_ADVVALIDLIFETIME;
1077 		pfx->pfx_preflifetime = DEF_ADVPREFERREDLIFETIME;
1078 		pfx->pfx_onlinkflg = 1;
1079 		pfx->pfx_autoconfflg = 1;
1080 		pfx->pfx_origin = PREFIX_FROM_KERNEL;
1081 		pfx->pfx_rainfo = rai;
1082 
1083 		/* link into chain */
1084 		TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next);
1085 
1086 		/* counter increment */
1087 		rai->rai_pfxs++;
1088 	}
1089 
1090 	freeifaddrs(ifap);
1091 }
1092 
1093 static void
makeentry(char * buf,size_t len,int id,const char * string)1094 makeentry(char *buf, size_t len, int id, const char *string)
1095 {
1096 
1097 	if (id < 0)
1098 		strlcpy(buf, string, len);
1099 	else
1100 		snprintf(buf, len, "%s%d", string, id);
1101 }
1102 
1103 /*
1104  * Add a prefix to the list of specified interface and reconstruct
1105  * the outgoing packet.
1106  * The prefix must not be in the list.
1107  * XXX: other parameters of the prefix (e.g. lifetime) should be
1108  * able to be specified.
1109  */
1110 static void
add_prefix(struct rainfo * rai,struct in6_prefixreq * ipr)1111 add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr)
1112 {
1113 	struct prefix *pfx;
1114 	struct ifinfo *ifi;
1115 	char ntopbuf[INET6_ADDRSTRLEN];
1116 
1117 	ifi = rai->rai_ifinfo;
1118 	ELM_MALLOC(pfx, return);
1119 	pfx->pfx_prefix = ipr->ipr_prefix.sin6_addr;
1120 	pfx->pfx_prefixlen = ipr->ipr_plen;
1121 	pfx->pfx_validlifetime = ipr->ipr_vltime;
1122 	pfx->pfx_preflifetime = ipr->ipr_pltime;
1123 	pfx->pfx_onlinkflg = ipr->ipr_raf_onlink;
1124 	pfx->pfx_autoconfflg = ipr->ipr_raf_auto;
1125 	pfx->pfx_origin = PREFIX_FROM_DYNAMIC;
1126 	pfx->pfx_rainfo = rai;
1127 
1128 	TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next);
1129 
1130 	syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s",
1131 	    __func__,
1132 	    inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
1133 		sizeof(ntopbuf)), ipr->ipr_plen, ifi->ifi_ifname);
1134 
1135 	rai->rai_pfxs++;
1136 }
1137 
1138 /*
1139  * Delete a prefix to the list of specified interface and reconstruct
1140  * the outgoing packet.
1141  * The prefix must be in the list.
1142  */
1143 void
delete_prefix(struct prefix * pfx)1144 delete_prefix(struct prefix *pfx)
1145 {
1146 	struct rainfo *rai;
1147 	struct ifinfo *ifi;
1148 	char ntopbuf[INET6_ADDRSTRLEN];
1149 
1150 	rai = pfx->pfx_rainfo;
1151 	ifi = rai->rai_ifinfo;
1152 	TAILQ_REMOVE(&rai->rai_prefix, pfx, pfx_next);
1153 	syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s",
1154 	    __func__,
1155 	    inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf,
1156 		sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname);
1157 	if (pfx->pfx_timer)
1158 		rtadvd_remove_timer(pfx->pfx_timer);
1159 	free(pfx);
1160 
1161 	rai->rai_pfxs--;
1162 }
1163 
1164 void
invalidate_prefix(struct prefix * pfx)1165 invalidate_prefix(struct prefix *pfx)
1166 {
1167 	struct timespec timo;
1168 	struct rainfo *rai;
1169 	struct ifinfo *ifi;
1170 	char ntopbuf[INET6_ADDRSTRLEN];
1171 
1172 	rai = pfx->pfx_rainfo;
1173 	ifi = rai->rai_ifinfo;
1174 	if (pfx->pfx_timer) {	/* sanity check */
1175 		syslog(LOG_ERR,
1176 		    "<%s> assumption failure: timer already exists",
1177 		    __func__);
1178 		exit(1);
1179 	}
1180 
1181 	syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, "
1182 	    "will expire in %ld seconds", __func__,
1183 	    inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, sizeof(ntopbuf)),
1184 	    pfx->pfx_prefixlen, ifi->ifi_ifname, (long)prefix_timo);
1185 
1186 	/* set the expiration timer */
1187 	pfx->pfx_timer = rtadvd_add_timer(prefix_timeout, NULL, pfx, NULL);
1188 	if (pfx->pfx_timer == NULL) {
1189 		syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. "
1190 		    "remove the prefix", __func__);
1191 		delete_prefix(pfx);
1192 	}
1193 	timo.tv_sec = prefix_timo;
1194 	timo.tv_nsec = 0;
1195 	rtadvd_set_timer(&timo, pfx->pfx_timer);
1196 }
1197 
1198 static struct rtadvd_timer *
prefix_timeout(void * arg)1199 prefix_timeout(void *arg)
1200 {
1201 
1202 	delete_prefix((struct prefix *)arg);
1203 
1204 	return (NULL);
1205 }
1206 
1207 void
update_prefix(struct prefix * pfx)1208 update_prefix(struct prefix *pfx)
1209 {
1210 	struct rainfo *rai;
1211 	struct ifinfo *ifi;
1212 	char ntopbuf[INET6_ADDRSTRLEN];
1213 
1214 	rai = pfx->pfx_rainfo;
1215 	ifi = rai->rai_ifinfo;
1216 	if (pfx->pfx_timer == NULL) { /* sanity check */
1217 		syslog(LOG_ERR,
1218 		    "<%s> assumption failure: timer does not exist",
1219 		    __func__);
1220 		exit(1);
1221 	}
1222 
1223 	syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s",
1224 	    __func__, inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf,
1225 		sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname);
1226 
1227 	/* stop the expiration timer */
1228 	rtadvd_remove_timer(pfx->pfx_timer);
1229 	pfx->pfx_timer = NULL;
1230 }
1231 
1232 /*
1233  * Try to get an in6_prefixreq contents for a prefix which matches
1234  * ipr->ipr_prefix and ipr->ipr_plen and belongs to
1235  * the interface whose name is ipr->ipr_name[].
1236  */
1237 static int
init_prefix(struct in6_prefixreq * ipr)1238 init_prefix(struct in6_prefixreq *ipr)
1239 {
1240 #if 0
1241 	int s;
1242 
1243 	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1244 		syslog(LOG_ERR, "<%s> socket: %s", __func__,
1245 		    strerror(errno));
1246 		exit(1);
1247 	}
1248 
1249 	if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) {
1250 		syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __func__,
1251 		    strerror(errno));
1252 
1253 		ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
1254 		ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
1255 		ipr->ipr_raf_onlink = 1;
1256 		ipr->ipr_raf_auto = 1;
1257 		/* omit other field initialization */
1258 	}
1259 	else if (ipr->ipr_origin < PR_ORIG_RR) {
1260 		char ntopbuf[INET6_ADDRSTRLEN];
1261 
1262 		syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is"
1263 		    "lower than PR_ORIG_RR(router renumbering)."
1264 		    "This should not happen if I am router", __func__,
1265 		    inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
1266 			sizeof(ntopbuf)), ipr->ipr_origin);
1267 		close(s);
1268 		return (1);
1269 	}
1270 
1271 	close(s);
1272 	return (0);
1273 #else
1274 	ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
1275 	ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
1276 	ipr->ipr_raf_onlink = 1;
1277 	ipr->ipr_raf_auto = 1;
1278 	return (0);
1279 #endif
1280 }
1281 
1282 void
make_prefix(struct rainfo * rai,int ifindex,struct in6_addr * addr,int plen)1283 make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen)
1284 {
1285 	struct in6_prefixreq ipr;
1286 
1287 	memset(&ipr, 0, sizeof(ipr));
1288 	if (if_indextoname(ifindex, ipr.ipr_name) == NULL) {
1289 		syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't "
1290 		    "exist. This should not happen! %s", __func__,
1291 		    ifindex, strerror(errno));
1292 		exit(1);
1293 	}
1294 	ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix);
1295 	ipr.ipr_prefix.sin6_family = AF_INET6;
1296 	ipr.ipr_prefix.sin6_addr = *addr;
1297 	ipr.ipr_plen = plen;
1298 
1299 	if (init_prefix(&ipr))
1300 		return; /* init failed by some error */
1301 	add_prefix(rai, &ipr);
1302 }
1303 
1304 void
make_packet(struct rainfo * rai)1305 make_packet(struct rainfo *rai)
1306 {
1307 	size_t packlen, lladdroptlen = 0;
1308 	char *buf;
1309 	struct nd_router_advert *ra;
1310 	struct nd_opt_prefix_info *ndopt_pi;
1311 	struct nd_opt_mtu *ndopt_mtu;
1312 	struct nd_opt_route_info *ndopt_rti;
1313 	struct rtinfo *rti;
1314 	struct nd_opt_rdnss *ndopt_rdnss;
1315 	struct rdnss *rdn;
1316 	struct nd_opt_dnssl *ndopt_dnssl;
1317 	struct dnssl *dns;
1318 	size_t len;
1319 	struct prefix *pfx;
1320 	struct ifinfo *ifi;
1321 
1322 	ifi = rai->rai_ifinfo;
1323 	/* calculate total length */
1324 	packlen = sizeof(struct nd_router_advert);
1325 	if (rai->rai_advlinkopt) {
1326 		if ((lladdroptlen = lladdropt_length(&ifi->ifi_sdl)) == 0) {
1327 			syslog(LOG_INFO,
1328 			    "<%s> link-layer address option has"
1329 			    " null length on %s.  Treat as not included.",
1330 			    __func__, ifi->ifi_ifname);
1331 			rai->rai_advlinkopt = 0;
1332 		}
1333 		packlen += lladdroptlen;
1334 	}
1335 	if (rai->rai_pfxs)
1336 		packlen += sizeof(struct nd_opt_prefix_info) * rai->rai_pfxs;
1337 	if (rai->rai_linkmtu)
1338 		packlen += sizeof(struct nd_opt_mtu);
1339 
1340 	TAILQ_FOREACH(rti, &rai->rai_route, rti_next)
1341 		packlen += sizeof(struct nd_opt_route_info) +
1342 			   ((rti->rti_prefixlen + 0x3f) >> 6) * 8;
1343 
1344 	TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) {
1345 		struct rdnss_addr *rdna;
1346 
1347 		packlen += sizeof(struct nd_opt_rdnss);
1348 		TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next)
1349 			packlen += sizeof(rdna->ra_dns);
1350 	}
1351 	TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) {
1352 		struct dnssl_addr *dnsa;
1353 
1354 		packlen += sizeof(struct nd_opt_dnssl);
1355 		len = 0;
1356 		TAILQ_FOREACH(dnsa, &dns->dn_list, da_next)
1357 			len += dnsa->da_len;
1358 
1359 		/* A zero octet and 8 octet boundary */
1360 		len++;
1361 		len += (len % 8) ? 8 - len % 8 : 0;
1362 
1363 		packlen += len;
1364 	}
1365 	/* allocate memory for the packet */
1366 	if ((buf = malloc(packlen)) == NULL) {
1367 		syslog(LOG_ERR,
1368 		    "<%s> can't get enough memory for an RA packet",
1369 		    __func__);
1370 		exit(1);
1371 	}
1372 	memset(buf, 0, packlen);
1373 	if (rai->rai_ra_data)	/* Free old data if any. */
1374 		free(rai->rai_ra_data);
1375 	rai->rai_ra_data = buf;
1376 	/* XXX: what if packlen > 576? */
1377 	rai->rai_ra_datalen = packlen;
1378 
1379 	/*
1380 	 * construct the packet
1381 	 */
1382 	ra = (struct nd_router_advert *)buf;
1383 	ra->nd_ra_type = ND_ROUTER_ADVERT;
1384 	ra->nd_ra_code = 0;
1385 	ra->nd_ra_cksum = 0;
1386 	ra->nd_ra_curhoplimit = (uint8_t)(0xff & rai->rai_hoplimit);
1387 	/*
1388 	 * XXX: the router preference field, which is a 2-bit field, should be
1389 	 * initialized before other fields.
1390 	 */
1391 	ra->nd_ra_flags_reserved = 0xff & rai->rai_rtpref;
1392 	ra->nd_ra_flags_reserved |=
1393 		rai->rai_managedflg ? ND_RA_FLAG_MANAGED : 0;
1394 	ra->nd_ra_flags_reserved |=
1395 		rai->rai_otherflg ? ND_RA_FLAG_OTHER : 0;
1396 	ra->nd_ra_router_lifetime = htons(rai->rai_lifetime);
1397 	ra->nd_ra_reachable = htonl(rai->rai_reachabletime);
1398 	ra->nd_ra_retransmit = htonl(rai->rai_retranstimer);
1399 	buf += sizeof(*ra);
1400 
1401 	if (rai->rai_advlinkopt) {
1402 		lladdropt_fill(&ifi->ifi_sdl, (struct nd_opt_hdr *)buf);
1403 		buf += lladdroptlen;
1404 	}
1405 
1406 	if (rai->rai_linkmtu) {
1407 		ndopt_mtu = (struct nd_opt_mtu *)buf;
1408 		ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU;
1409 		ndopt_mtu->nd_opt_mtu_len = 1;
1410 		ndopt_mtu->nd_opt_mtu_reserved = 0;
1411 		ndopt_mtu->nd_opt_mtu_mtu = htonl(rai->rai_linkmtu);
1412 		buf += sizeof(struct nd_opt_mtu);
1413 	}
1414 
1415 	TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) {
1416 		uint32_t vltime, pltime;
1417 		struct timespec now;
1418 
1419 		ndopt_pi = (struct nd_opt_prefix_info *)buf;
1420 		ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
1421 		ndopt_pi->nd_opt_pi_len = 4;
1422 		ndopt_pi->nd_opt_pi_prefix_len = pfx->pfx_prefixlen;
1423 		ndopt_pi->nd_opt_pi_flags_reserved = 0;
1424 		if (pfx->pfx_onlinkflg)
1425 			ndopt_pi->nd_opt_pi_flags_reserved |=
1426 				ND_OPT_PI_FLAG_ONLINK;
1427 		if (pfx->pfx_autoconfflg)
1428 			ndopt_pi->nd_opt_pi_flags_reserved |=
1429 				ND_OPT_PI_FLAG_AUTO;
1430 		if (pfx->pfx_timer)
1431 			vltime = 0;
1432 		else {
1433 			if (pfx->pfx_vltimeexpire || pfx->pfx_pltimeexpire)
1434 				clock_gettime(CLOCK_MONOTONIC_FAST, &now);
1435 			if (pfx->pfx_vltimeexpire == 0)
1436 				vltime = pfx->pfx_validlifetime;
1437 			else
1438 				vltime = ((time_t)pfx->pfx_vltimeexpire > now.tv_sec) ?
1439 				    pfx->pfx_vltimeexpire - now.tv_sec : 0;
1440 		}
1441 		if (pfx->pfx_timer)
1442 			pltime = 0;
1443 		else {
1444 			if (pfx->pfx_pltimeexpire == 0)
1445 				pltime = pfx->pfx_preflifetime;
1446 			else
1447 				pltime = ((time_t)pfx->pfx_pltimeexpire > now.tv_sec) ?
1448 				    pfx->pfx_pltimeexpire - now.tv_sec : 0;
1449 		}
1450 		if (vltime < pltime) {
1451 			/*
1452 			 * this can happen if vltime is decrement but pltime
1453 			 * is not.
1454 			 */
1455 			pltime = vltime;
1456 		}
1457 		ndopt_pi->nd_opt_pi_valid_time = htonl(vltime);
1458 		ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime);
1459 		ndopt_pi->nd_opt_pi_reserved2 = 0;
1460 		ndopt_pi->nd_opt_pi_prefix = pfx->pfx_prefix;
1461 
1462 		buf += sizeof(struct nd_opt_prefix_info);
1463 	}
1464 
1465 	TAILQ_FOREACH(rti, &rai->rai_route, rti_next) {
1466 		uint8_t psize = (rti->rti_prefixlen + 0x3f) >> 6;
1467 
1468 		ndopt_rti = (struct nd_opt_route_info *)buf;
1469 		ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO;
1470 		ndopt_rti->nd_opt_rti_len = 1 + psize;
1471 		ndopt_rti->nd_opt_rti_prefixlen = rti->rti_prefixlen;
1472 		ndopt_rti->nd_opt_rti_flags = 0xff & rti->rti_rtpref;
1473 		ndopt_rti->nd_opt_rti_lifetime = htonl(rti->rti_ltime);
1474 		memcpy(ndopt_rti + 1, &rti->rti_prefix, psize * 8);
1475 		buf += sizeof(struct nd_opt_route_info) + psize * 8;
1476 	}
1477 
1478 	TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) {
1479 		struct rdnss_addr *rdna;
1480 
1481 		ndopt_rdnss = (struct nd_opt_rdnss *)buf;
1482 		ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS;
1483 		ndopt_rdnss->nd_opt_rdnss_len = 0;
1484 		ndopt_rdnss->nd_opt_rdnss_reserved = 0;
1485 		ndopt_rdnss->nd_opt_rdnss_lifetime = htonl(rdn->rd_ltime);
1486 		buf += sizeof(struct nd_opt_rdnss);
1487 
1488 		TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next) {
1489 			memcpy(buf, &rdna->ra_dns, sizeof(rdna->ra_dns));
1490 			buf += sizeof(rdna->ra_dns);
1491 		}
1492 		/* Length field should be in 8 octets */
1493 		ndopt_rdnss->nd_opt_rdnss_len = (buf - (char *)ndopt_rdnss) / 8;
1494 
1495 		syslog(LOG_DEBUG, "<%s>: nd_opt_dnss_len = %d", __func__,
1496 		    ndopt_rdnss->nd_opt_rdnss_len);
1497 	}
1498 
1499 	TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) {
1500 		struct dnssl_addr *dnsa;
1501 		uint8_t modulo;
1502 		uint8_t pad_len;
1503 
1504 		ndopt_dnssl = (struct nd_opt_dnssl *)buf;
1505 		ndopt_dnssl->nd_opt_dnssl_type = ND_OPT_DNSSL;
1506 		ndopt_dnssl->nd_opt_dnssl_len = 0;
1507 		ndopt_dnssl->nd_opt_dnssl_reserved = 0;
1508 		ndopt_dnssl->nd_opt_dnssl_lifetime = htonl(dns->dn_ltime);
1509 		buf += sizeof(*ndopt_dnssl);
1510 
1511 		TAILQ_FOREACH(dnsa, &dns->dn_list, da_next) {
1512 			memcpy(buf, dnsa->da_dom, dnsa->da_len);
1513 			buf += dnsa->da_len;
1514 		}
1515 
1516 		/* A zero octet after encoded DNS server list. */
1517 		*buf++ = '\0';
1518 
1519 		/* Padding to next 8 octets boundary */
1520 		len = buf - (char *)ndopt_dnssl;
1521 		modulo = len % 8;
1522 		pad_len = (modulo != 0) ? (8 - modulo) : 0;
1523 		len += pad_len;
1524 		buf += pad_len;
1525 
1526 		/* Length field must be in 8 octets */
1527 		ndopt_dnssl->nd_opt_dnssl_len = len / 8;
1528 
1529 		syslog(LOG_DEBUG, "<%s>: nd_opt_dnssl_len = %d", __func__,
1530 		    ndopt_dnssl->nd_opt_dnssl_len);
1531 	}
1532 	return;
1533 }
1534