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turns printfs back on
[freebsd-src/fkvm-freebsd.git] / usr.sbin / rtadvd / config.c
blob5eadcc563e06944a5d9206eb6e6ff782c8bea403
1 /* $FreeBSD$ */
2 /* $KAME: config.c,v 1.84 2003/08/05 12:34:23 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/param.h>
34 #include <sys/ioctl.h>
35 #include <sys/socket.h>
36 #include <sys/time.h>
37 #include <sys/sysctl.h>
38
39 #include <net/if.h>
40 #include <net/if_var.h>
41 #include <net/route.h>
42 #include <net/if_dl.h>
43
44 #include <netinet/in.h>
45 #include <netinet/in_var.h>
46 #include <netinet/ip6.h>
47 #include <netinet6/ip6_var.h>
48 #include <netinet/icmp6.h>
49 #include <netinet6/nd6.h>
50
51 #include <arpa/inet.h>
52
53 #include <stdio.h>
54 #include <syslog.h>
55 #include <errno.h>
56 #include <string.h>
57 #include <search.h>
58 #include <stdlib.h>
59 #include <unistd.h>
60 #include <ifaddrs.h>
61
62 #include "rtadvd.h"
63 #include "advcap.h"
64 #include "timer.h"
65 #include "if.h"
66 #include "config.h"
67
68 static time_t prefix_timo = (60 * 120); /* 2 hours.
69 * XXX: should be configurable. */
70 extern struct rainfo *ralist;
71
72 static struct rtadvd_timer *prefix_timeout(void *);
73 static void makeentry(char *, size_t, int, char *);
74 static int getinet6sysctl(int);
75
76 void
77 getconfig(intface)
78 char *intface;
79 {
80 int stat, i;
81 char tbuf[BUFSIZ];
82 struct rainfo *tmp;
83 long val;
84 int64_t val64;
85 char buf[BUFSIZ];
86 char *bp = buf;
87 char *addr, *flagstr;
88 static int forwarding = -1;
89
90 #define MUSTHAVE(var, cap) \
91 do { \
92 int64_t t; \
93 if ((t = agetnum(cap)) < 0) { \
94 fprintf(stderr, "rtadvd: need %s for interface %s\n", \
95 cap, intface); \
96 exit(1); \
97 } \
98 var = t; \
99 } while (0)
100 #define MAYHAVE(var, cap, def) \
101 do { \
102 if ((var = agetnum(cap)) < 0) \
103 var = def; \
104 } while (0)
105
106 if ((stat = agetent(tbuf, intface)) <= 0) {
107 memset(tbuf, 0, sizeof(tbuf));
108 syslog(LOG_INFO,
109 "<%s> %s isn't defined in the configuration file"
110 " or the configuration file doesn't exist."
111 " Treat it as default",
112 __func__, intface);
113 }
114
115 tmp = (struct rainfo *)malloc(sizeof(*ralist));
116 if (tmp == NULL) {
117 syslog(LOG_INFO, "<%s> %s: can't allocate enough memory",
118 __func__, intface);
119 exit(1);
120 }
121 memset(tmp, 0, sizeof(*tmp));
122 tmp->prefix.next = tmp->prefix.prev = &tmp->prefix;
123 #ifdef ROUTEINFO
124 tmp->route.next = tmp->route.prev = &tmp->route;
125 #endif
126
127 /* check if we are allowed to forward packets (if not determined) */
128 if (forwarding < 0) {
129 if ((forwarding = getinet6sysctl(IPV6CTL_FORWARDING)) < 0)
130 exit(1);
131 }
132
133 /* get interface information */
134 if (agetflag("nolladdr"))
135 tmp->advlinkopt = 0;
136 else
137 tmp->advlinkopt = 1;
138 if (tmp->advlinkopt) {
139 if ((tmp->sdl = if_nametosdl(intface)) == NULL) {
140 syslog(LOG_ERR,
141 "<%s> can't get information of %s",
142 __func__, intface);
143 exit(1);
144 }
145 tmp->ifindex = tmp->sdl->sdl_index;
146 } else
147 tmp->ifindex = if_nametoindex(intface);
148 strncpy(tmp->ifname, intface, sizeof(tmp->ifname));
149 if ((tmp->phymtu = if_getmtu(intface)) == 0) {
150 tmp->phymtu = IPV6_MMTU;
151 syslog(LOG_WARNING,
152 "<%s> can't get interface mtu of %s. Treat as %d",
153 __func__, intface, IPV6_MMTU);
154 }
155
156 /*
157 * set router configuration variables.
158 */
159 MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL);
160 if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) {
161 syslog(LOG_ERR,
162 "<%s> maxinterval (%ld) on %s is invalid "
163 "(must be between %u and %u)", __func__, val,
164 intface, MIN_MAXINTERVAL, MAX_MAXINTERVAL);
165 exit(1);
166 }
167 tmp->maxinterval = (u_int)val;
168 MAYHAVE(val, "mininterval", tmp->maxinterval/3);
169 if (val < MIN_MININTERVAL || val > (tmp->maxinterval * 3) / 4) {
170 syslog(LOG_ERR,
171 "<%s> mininterval (%ld) on %s is invalid "
172 "(must be between %d and %d)",
173 __func__, val, intface, MIN_MININTERVAL,
174 (tmp->maxinterval * 3) / 4);
175 exit(1);
176 }
177 tmp->mininterval = (u_int)val;
178
179 MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT);
180 tmp->hoplimit = val & 0xff;
181
182 if ((flagstr = (char *)agetstr("raflags", &bp))) {
183 val = 0;
184 if (strchr(flagstr, 'm'))
185 val |= ND_RA_FLAG_MANAGED;
186 if (strchr(flagstr, 'o'))
187 val |= ND_RA_FLAG_OTHER;
188 if (strchr(flagstr, 'h'))
189 val |= ND_RA_FLAG_RTPREF_HIGH;
190 if (strchr(flagstr, 'l')) {
191 if ((val & ND_RA_FLAG_RTPREF_HIGH)) {
192 syslog(LOG_ERR, "<%s> the \'h\' and \'l\'"
193 " router flags are exclusive", __func__);
194 exit(1);
195 }
196 val |= ND_RA_FLAG_RTPREF_LOW;
197 }
198 } else {
199 MAYHAVE(val, "raflags", 0);
200 }
201 tmp->managedflg = val & ND_RA_FLAG_MANAGED;
202 tmp->otherflg = val & ND_RA_FLAG_OTHER;
203 #ifndef ND_RA_FLAG_RTPREF_MASK
204 #define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */
205 #define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */
206 #endif
207 tmp->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
208 if (tmp->rtpref == ND_RA_FLAG_RTPREF_RSV) {
209 syslog(LOG_ERR, "<%s> invalid router preference (%02x) on %s",
210 __func__, tmp->rtpref, intface);
211 exit(1);
212 }
213
214 MAYHAVE(val, "rltime", tmp->maxinterval * 3);
215 if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) {
216 syslog(LOG_ERR,
217 "<%s> router lifetime (%ld) on %s is invalid "
218 "(must be 0 or between %d and %d)",
219 __func__, val, intface,
220 tmp->maxinterval,
221 MAXROUTERLIFETIME);
222 exit(1);
223 }
224 /*
225 * Basically, hosts MUST NOT send Router Advertisement messages at any
226 * time (RFC 2461, Section 6.2.3). However, it would sometimes be
227 * useful to allow hosts to advertise some parameters such as prefix
228 * information and link MTU. Thus, we allow hosts to invoke rtadvd
229 * only when router lifetime (on every advertising interface) is
230 * explicitly set zero. (see also the above section)
231 */
232 if (val && forwarding == 0) {
233 syslog(LOG_ERR,
234 "<%s> non zero router lifetime is specified for %s, "
235 "which must not be allowed for hosts. you must "
236 "change router lifetime or enable IPv6 forwarding.",
237 __func__, intface);
238 exit(1);
239 }
240 tmp->lifetime = val & 0xffff;
241
242 MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME);
243 if (val < 0 || val > MAXREACHABLETIME) {
244 syslog(LOG_ERR,
245 "<%s> reachable time (%ld) on %s is invalid "
246 "(must be no greater than %d)",
247 __func__, val, intface, MAXREACHABLETIME);
248 exit(1);
249 }
250 tmp->reachabletime = (u_int32_t)val;
251
252 MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER);
253 if (val64 < 0 || val64 > 0xffffffff) {
254 syslog(LOG_ERR, "<%s> retrans time (%lld) on %s out of range",
255 __func__, (long long)val64, intface);
256 exit(1);
257 }
258 tmp->retranstimer = (u_int32_t)val64;
259
260 if (agetnum("hapref") != -1 || agetnum("hatime") != -1) {
261 syslog(LOG_ERR,
262 "<%s> mobile-ip6 configuration not supported",
263 __func__);
264 exit(1);
265 }
266 /* prefix information */
267
268 /*
269 * This is an implementation specific parameter to consider
270 * link propagation delays and poorly synchronized clocks when
271 * checking consistency of advertised lifetimes.
272 */
273 MAYHAVE(val, "clockskew", 0);
274 tmp->clockskew = val;
275
276 tmp->pfxs = 0;
277 for (i = -1; i < MAXPREFIX; i++) {
278 struct prefix *pfx;
279 char entbuf[256];
280
281 makeentry(entbuf, sizeof(entbuf), i, "addr");
282 addr = (char *)agetstr(entbuf, &bp);
283 if (addr == NULL)
284 continue;
285
286 /* allocate memory to store prefix information */
287 if ((pfx = malloc(sizeof(struct prefix))) == NULL) {
288 syslog(LOG_ERR,
289 "<%s> can't allocate enough memory",
290 __func__);
291 exit(1);
292 }
293 memset(pfx, 0, sizeof(*pfx));
294
295 /* link into chain */
296 insque(pfx, &tmp->prefix);
297 tmp->pfxs++;
298 pfx->rainfo = tmp;
299
300 pfx->origin = PREFIX_FROM_CONFIG;
301
302 if (inet_pton(AF_INET6, addr, &pfx->prefix) != 1) {
303 syslog(LOG_ERR,
304 "<%s> inet_pton failed for %s",
305 __func__, addr);
306 exit(1);
307 }
308 if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) {
309 syslog(LOG_ERR,
310 "<%s> multicast prefix (%s) must "
311 "not be advertised on %s",
312 __func__, addr, intface);
313 exit(1);
314 }
315 if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix))
316 syslog(LOG_NOTICE,
317 "<%s> link-local prefix (%s) will be"
318 " advertised on %s",
319 __func__, addr, intface);
320
321 makeentry(entbuf, sizeof(entbuf), i, "prefixlen");
322 MAYHAVE(val, entbuf, 64);
323 if (val < 0 || val > 128) {
324 syslog(LOG_ERR, "<%s> prefixlen (%ld) for %s "
325 "on %s out of range",
326 __func__, val, addr, intface);
327 exit(1);
328 }
329 pfx->prefixlen = (int)val;
330
331 makeentry(entbuf, sizeof(entbuf), i, "pinfoflags");
332 if ((flagstr = (char *)agetstr(entbuf, &bp))) {
333 val = 0;
334 if (strchr(flagstr, 'l'))
335 val |= ND_OPT_PI_FLAG_ONLINK;
336 if (strchr(flagstr, 'a'))
337 val |= ND_OPT_PI_FLAG_AUTO;
338 } else {
339 MAYHAVE(val, entbuf,
340 (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO));
341 }
342 pfx->onlinkflg = val & ND_OPT_PI_FLAG_ONLINK;
343 pfx->autoconfflg = val & ND_OPT_PI_FLAG_AUTO;
344
345 makeentry(entbuf, sizeof(entbuf), i, "vltime");
346 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
347 if (val64 < 0 || val64 > 0xffffffff) {
348 syslog(LOG_ERR, "<%s> vltime (%lld) for "
349 "%s/%d on %s is out of range",
350 __func__, (long long)val64,
351 addr, pfx->prefixlen, intface);
352 exit(1);
353 }
354 pfx->validlifetime = (u_int32_t)val64;
355
356 makeentry(entbuf, sizeof(entbuf), i, "vltimedecr");
357 if (agetflag(entbuf)) {
358 struct timeval now;
359 gettimeofday(&now, 0);
360 pfx->vltimeexpire =
361 now.tv_sec + pfx->validlifetime;
362 }
363
364 makeentry(entbuf, sizeof(entbuf), i, "pltime");
365 MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME);
366 if (val64 < 0 || val64 > 0xffffffff) {
367 syslog(LOG_ERR,
368 "<%s> pltime (%lld) for %s/%d on %s "
369 "is out of range",
370 __func__, (long long)val64,
371 addr, pfx->prefixlen, intface);
372 exit(1);
373 }
374 pfx->preflifetime = (u_int32_t)val64;
375
376 makeentry(entbuf, sizeof(entbuf), i, "pltimedecr");
377 if (agetflag(entbuf)) {
378 struct timeval now;
379 gettimeofday(&now, 0);
380 pfx->pltimeexpire =
381 now.tv_sec + pfx->preflifetime;
382 }
383 }
384 if (tmp->pfxs == 0)
385 get_prefix(tmp);
386
387 MAYHAVE(val, "mtu", 0);
388 if (val < 0 || val > 0xffffffff) {
389 syslog(LOG_ERR,
390 "<%s> mtu (%ld) on %s out of range",
391 __func__, val, intface);
392 exit(1);
393 }
394 tmp->linkmtu = (u_int32_t)val;
395 if (tmp->linkmtu == 0) {
396 char *mtustr;
397
398 if ((mtustr = (char *)agetstr("mtu", &bp)) &&
399 strcmp(mtustr, "auto") == 0)
400 tmp->linkmtu = tmp->phymtu;
401 }
402 else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) {
403 syslog(LOG_ERR,
404 "<%s> advertised link mtu (%lu) on %s is invalid (must "
405 "be between least MTU (%d) and physical link MTU (%d)",
406 __func__, (unsigned long)tmp->linkmtu, intface,
407 IPV6_MMTU, tmp->phymtu);
408 exit(1);
409 }
410
411 #ifdef SIOCSIFINFO_IN6
412 {
413 struct in6_ndireq ndi;
414 int s;
415
416 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
417 syslog(LOG_ERR, "<%s> socket: %s", __func__,
418 strerror(errno));
419 exit(1);
420 }
421 memset(&ndi, 0, sizeof(ndi));
422 strncpy(ndi.ifname, intface, IFNAMSIZ);
423 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&ndi) < 0) {
424 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFINFO_IN6 at %s: %s",
425 __func__, intface, strerror(errno));
426 }
427
428 /* reflect the RA info to the host variables in kernel */
429 ndi.ndi.chlim = tmp->hoplimit;
430 ndi.ndi.retrans = tmp->retranstimer;
431 ndi.ndi.basereachable = tmp->reachabletime;
432 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&ndi) < 0) {
433 syslog(LOG_INFO, "<%s> ioctl:SIOCSIFINFO_IN6 at %s: %s",
434 __func__, intface, strerror(errno));
435 }
436 close(s);
437 }
438 #endif
439
440 /* route information */
441 #ifdef ROUTEINFO
442 tmp->routes = 0;
443 for (i = -1; i < MAXROUTE; i++) {
444 struct rtinfo *rti;
445 char entbuf[256], oentbuf[256];
446
447 makeentry(entbuf, sizeof(entbuf), i, "rtprefix");
448 addr = (char *)agetstr(entbuf, &bp);
449 if (addr == NULL) {
450 makeentry(oentbuf, sizeof(oentbuf), i, "rtrprefix");
451 addr = (char *)agetstr(oentbuf, &bp);
452 if (addr) {
453 fprintf(stderr, "%s was obsoleted. Use %s.\n",
454 oentbuf, entbuf);
455 }
456 }
457 if (addr == NULL)
458 continue;
459
460 /* allocate memory to store prefix information */
461 if ((rti = malloc(sizeof(struct rtinfo))) == NULL) {
462 syslog(LOG_ERR,
463 "<%s> can't allocate enough memory",
464 __func__);
465 exit(1);
466 }
467 memset(rti, 0, sizeof(*rti));
468
469 /* link into chain */
470 insque(rti, &tmp->route);
471 tmp->routes++;
472
473 if (inet_pton(AF_INET6, addr, &rti->prefix) != 1) {
474 syslog(LOG_ERR, "<%s> inet_pton failed for %s",
475 __func__, addr);
476 exit(1);
477 }
478 #if 0
479 /*
480 * XXX: currently there's no restriction in route information
481 * prefix according to
482 * draft-ietf-ipngwg-router-selection-00.txt.
483 * However, I think the similar restriction be necessary.
484 */
485 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
486 if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) {
487 syslog(LOG_ERR,
488 "<%s> multicast route (%s) must "
489 "not be advertised on %s",
490 __func__, addr, intface);
491 exit(1);
492 }
493 if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) {
494 syslog(LOG_NOTICE,
495 "<%s> link-local route (%s) will "
496 "be advertised on %s",
497 __func__, addr, intface);
498 exit(1);
499 }
500 #endif
501
502 makeentry(entbuf, sizeof(entbuf), i, "rtplen");
503 /* XXX: 256 is a magic number for compatibility check. */
504 MAYHAVE(val, entbuf, 256);
505 if (val == 256) {
506 makeentry(oentbuf, sizeof(oentbuf), i, "rtrplen");
507 MAYHAVE(val, oentbuf, 256);
508 if (val != 256) {
509 fprintf(stderr, "%s was obsoleted. Use %s.\n",
510 oentbuf, entbuf);
511 } else
512 val = 64;
513 }
514 if (val < 0 || val > 128) {
515 syslog(LOG_ERR, "<%s> prefixlen (%ld) for %s on %s "
516 "out of range",
517 __func__, val, addr, intface);
518 exit(1);
519 }
520 rti->prefixlen = (int)val;
521
522 makeentry(entbuf, sizeof(entbuf), i, "rtflags");
523 if ((flagstr = (char *)agetstr(entbuf, &bp))) {
524 val = 0;
525 if (strchr(flagstr, 'h'))
526 val |= ND_RA_FLAG_RTPREF_HIGH;
527 if (strchr(flagstr, 'l')) {
528 if ((val & ND_RA_FLAG_RTPREF_HIGH)) {
529 syslog(LOG_ERR,
530 "<%s> the \'h\' and \'l\' route"
531 " preferences are exclusive",
532 __func__);
533 exit(1);
534 }
535 val |= ND_RA_FLAG_RTPREF_LOW;
536 }
537 } else
538 MAYHAVE(val, entbuf, 256); /* XXX */
539 if (val == 256) {
540 makeentry(oentbuf, sizeof(oentbuf), i, "rtrflags");
541 MAYHAVE(val, oentbuf, 256);
542 if (val != 256) {
543 fprintf(stderr, "%s was obsoleted. Use %s.\n",
544 oentbuf, entbuf);
545 } else
546 val = 0;
547 }
548 rti->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
549 if (rti->rtpref == ND_RA_FLAG_RTPREF_RSV) {
550 syslog(LOG_ERR, "<%s> invalid route preference (%02x) "
551 "for %s/%d on %s",
552 __func__, rti->rtpref, addr,
553 rti->prefixlen, intface);
554 exit(1);
555 }
556
557 /*
558 * Since the spec does not a default value, we should make
559 * this entry mandatory. However, FreeBSD 4.4 has shipped
560 * with this field being optional, we use the router lifetime
561 * as an ad-hoc default value with a warning message.
562 */
563 makeentry(entbuf, sizeof(entbuf), i, "rtltime");
564 MAYHAVE(val64, entbuf, -1);
565 if (val64 == -1) {
566 makeentry(oentbuf, sizeof(oentbuf), i, "rtrltime");
567 MAYHAVE(val64, oentbuf, -1);
568 if (val64 != -1) {
569 fprintf(stderr, "%s was obsoleted. Use %s.\n",
570 oentbuf, entbuf);
571 } else {
572 fprintf(stderr, "%s should be specified "
573 "for interface %s.\n",
574 entbuf, intface);
575 val64 = tmp->lifetime;
576 }
577 }
578 if (val64 < 0 || val64 > 0xffffffff) {
579 syslog(LOG_ERR, "<%s> route lifetime (%lld) for "
580 "%s/%d on %s out of range", __func__,
581 (long long)val64, addr, rti->prefixlen, intface);
582 exit(1);
583 }
584 rti->ltime = (u_int32_t)val64;
585 }
586 #endif
587
588 /* okey */
589 tmp->next = ralist;
590 ralist = tmp;
591
592 /* construct the sending packet */
593 make_packet(tmp);
594
595 /* set timer */
596 tmp->timer = rtadvd_add_timer(ra_timeout, ra_timer_update,
597 tmp, tmp);
598 ra_timer_update((void *)tmp, &tmp->timer->tm);
599 rtadvd_set_timer(&tmp->timer->tm, tmp->timer);
600 }
601
602 void
603 get_prefix(struct rainfo *rai)
604 {
605 struct ifaddrs *ifap, *ifa;
606 struct prefix *pp;
607 struct in6_addr *a;
608 u_char *p, *ep, *m, *lim;
609 u_char ntopbuf[INET6_ADDRSTRLEN];
610
611 if (getifaddrs(&ifap) < 0) {
612 syslog(LOG_ERR,
613 "<%s> can't get interface addresses",
614 __func__);
615 exit(1);
616 }
617
618 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
619 int plen;
620
621 if (strcmp(ifa->ifa_name, rai->ifname) != 0)
622 continue;
623 if (ifa->ifa_addr->sa_family != AF_INET6)
624 continue;
625 a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
626 if (IN6_IS_ADDR_LINKLOCAL(a))
627 continue;
628 /* get prefix length */
629 m = (u_char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
630 lim = (u_char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len;
631 plen = prefixlen(m, lim);
632 if (plen <= 0 || plen > 128) {
633 syslog(LOG_ERR, "<%s> failed to get prefixlen "
634 "or prefix is invalid",
635 __func__);
636 exit(1);
637 }
638 if (plen == 128) /* XXX */
639 continue;
640 if (find_prefix(rai, a, plen)) {
641 /* ignore a duplicated prefix. */
642 continue;
643 }
644
645 /* allocate memory to store prefix info. */
646 if ((pp = malloc(sizeof(*pp))) == NULL) {
647 syslog(LOG_ERR,
648 "<%s> can't get allocate buffer for prefix",
649 __func__);
650 exit(1);
651 }
652 memset(pp, 0, sizeof(*pp));
653
654 /* set prefix, sweep bits outside of prefixlen */
655 pp->prefixlen = plen;
656 memcpy(&pp->prefix, a, sizeof(*a));
657 p = (u_char *)&pp->prefix;
658 ep = (u_char *)(&pp->prefix + 1);
659 while (m < lim && p < ep)
660 *p++ &= *m++;
661 while (p < ep)
662 *p++ = 0x00;
663 if (!inet_ntop(AF_INET6, &pp->prefix, ntopbuf,
664 sizeof(ntopbuf))) {
665 syslog(LOG_ERR, "<%s> inet_ntop failed", __func__);
666 exit(1);
667 }
668 syslog(LOG_DEBUG,
669 "<%s> add %s/%d to prefix list on %s",
670 __func__, ntopbuf, pp->prefixlen, rai->ifname);
671
672 /* set other fields with protocol defaults */
673 pp->validlifetime = DEF_ADVVALIDLIFETIME;
674 pp->preflifetime = DEF_ADVPREFERREDLIFETIME;
675 pp->onlinkflg = 1;
676 pp->autoconfflg = 1;
677 pp->origin = PREFIX_FROM_KERNEL;
678 pp->rainfo = rai;
679
680 /* link into chain */
681 insque(pp, &rai->prefix);
682
683 /* counter increment */
684 rai->pfxs++;
685 }
686
687 freeifaddrs(ifap);
688 }
689
690 static void
691 makeentry(buf, len, id, string)
692 char *buf;
693 size_t len;
694 int id;
695 char *string;
696 {
697
698 if (id < 0)
699 strlcpy(buf, string, len);
700 else
701 snprintf(buf, len, "%s%d", string, id);
702 }
703
704 /*
705 * Add a prefix to the list of specified interface and reconstruct
706 * the outgoing packet.
707 * The prefix must not be in the list.
708 * XXX: other parameters of the prefix (e.g. lifetime) should be
709 * able to be specified.
710 */
711 static void
712 add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr)
713 {
714 struct prefix *prefix;
715 u_char ntopbuf[INET6_ADDRSTRLEN];
716
717 if ((prefix = malloc(sizeof(*prefix))) == NULL) {
718 syslog(LOG_ERR, "<%s> memory allocation failed",
719 __func__);
720 return; /* XXX: error or exit? */
721 }
722 memset(prefix, 0, sizeof(*prefix));
723 prefix->prefix = ipr->ipr_prefix.sin6_addr;
724 prefix->prefixlen = ipr->ipr_plen;
725 prefix->validlifetime = ipr->ipr_vltime;
726 prefix->preflifetime = ipr->ipr_pltime;
727 prefix->onlinkflg = ipr->ipr_raf_onlink;
728 prefix->autoconfflg = ipr->ipr_raf_auto;
729 prefix->origin = PREFIX_FROM_DYNAMIC;
730
731 insque(prefix, &rai->prefix);
732 prefix->rainfo = rai;
733
734 syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s",
735 __func__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr,
736 ntopbuf, INET6_ADDRSTRLEN),
737 ipr->ipr_plen, rai->ifname);
738
739 /* free the previous packet */
740 free(rai->ra_data);
741 rai->ra_data = NULL;
742
743 /* reconstruct the packet */
744 rai->pfxs++;
745 make_packet(rai);
746 }
747
748 /*
749 * Delete a prefix to the list of specified interface and reconstruct
750 * the outgoing packet.
751 * The prefix must be in the list.
752 */
753 void
754 delete_prefix(struct prefix *prefix)
755 {
756 u_char ntopbuf[INET6_ADDRSTRLEN];
757 struct rainfo *rai = prefix->rainfo;
758
759 remque(prefix);
760 syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s",
761 __func__, inet_ntop(AF_INET6, &prefix->prefix,
762 ntopbuf, INET6_ADDRSTRLEN),
763 prefix->prefixlen, rai->ifname);
764 if (prefix->timer)
765 rtadvd_remove_timer(&prefix->timer);
766 free(prefix);
767 rai->pfxs--;
768 }
769
770 void
771 invalidate_prefix(struct prefix *prefix)
772 {
773 u_char ntopbuf[INET6_ADDRSTRLEN];
774 struct timeval timo;
775 struct rainfo *rai = prefix->rainfo;
776
777 if (prefix->timer) { /* sanity check */
778 syslog(LOG_ERR,
779 "<%s> assumption failure: timer already exists",
780 __func__);
781 exit(1);
782 }
783
784 syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, "
785 "will expire in %ld seconds", __func__,
786 inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, INET6_ADDRSTRLEN),
787 prefix->prefixlen, rai->ifname, (long)prefix_timo);
788
789 /* set the expiration timer */
790 prefix->timer = rtadvd_add_timer(prefix_timeout, NULL, prefix, NULL);
791 if (prefix->timer == NULL) {
792 syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. "
793 "remove the prefix", __func__);
794 delete_prefix(prefix);
795 }
796 timo.tv_sec = prefix_timo;
797 timo.tv_usec = 0;
798 rtadvd_set_timer(&timo, prefix->timer);
799 }
800
801 static struct rtadvd_timer *
802 prefix_timeout(void *arg)
803 {
804 struct prefix *prefix = (struct prefix *)arg;
805
806 delete_prefix(prefix);
807
808 return(NULL);
809 }
810
811 void
812 update_prefix(struct prefix * prefix)
813 {
814 u_char ntopbuf[INET6_ADDRSTRLEN];
815 struct rainfo *rai = prefix->rainfo;
816
817 if (prefix->timer == NULL) { /* sanity check */
818 syslog(LOG_ERR,
819 "<%s> assumption failure: timer does not exist",
820 __func__);
821 exit(1);
822 }
823
824 syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s",
825 __func__, inet_ntop(AF_INET6, &prefix->prefix, ntopbuf,
826 INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname);
827
828 /* stop the expiration timer */
829 rtadvd_remove_timer(&prefix->timer);
830 }
831
832 /*
833 * Try to get an in6_prefixreq contents for a prefix which matches
834 * ipr->ipr_prefix and ipr->ipr_plen and belongs to
835 * the interface whose name is ipr->ipr_name[].
836 */
837 static int
838 init_prefix(struct in6_prefixreq *ipr)
839 {
840 #if 0
841 int s;
842
843 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
844 syslog(LOG_ERR, "<%s> socket: %s", __func__,
845 strerror(errno));
846 exit(1);
847 }
848
849 if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) {
850 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __func__,
851 strerror(errno));
852
853 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
854 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
855 ipr->ipr_raf_onlink = 1;
856 ipr->ipr_raf_auto = 1;
857 /* omit other field initialization */
858 }
859 else if (ipr->ipr_origin < PR_ORIG_RR) {
860 u_char ntopbuf[INET6_ADDRSTRLEN];
861
862 syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is"
863 "lower than PR_ORIG_RR(router renumbering)."
864 "This should not happen if I am router", __func__,
865 inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
866 sizeof(ntopbuf)), ipr->ipr_origin);
867 close(s);
868 return 1;
869 }
870
871 close(s);
872 return 0;
873 #else
874 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
875 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
876 ipr->ipr_raf_onlink = 1;
877 ipr->ipr_raf_auto = 1;
878 return 0;
879 #endif
880 }
881
882 void
883 make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen)
884 {
885 struct in6_prefixreq ipr;
886
887 memset(&ipr, 0, sizeof(ipr));
888 if (if_indextoname(ifindex, ipr.ipr_name) == NULL) {
889 syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't"
890 "exist. This should not happen! %s", __func__,
891 ifindex, strerror(errno));
892 exit(1);
893 }
894 ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix);
895 ipr.ipr_prefix.sin6_family = AF_INET6;
896 ipr.ipr_prefix.sin6_addr = *addr;
897 ipr.ipr_plen = plen;
898
899 if (init_prefix(&ipr))
900 return; /* init failed by some error */
901 add_prefix(rai, &ipr);
902 }
903
904 void
905 make_packet(struct rainfo *rainfo)
906 {
907 size_t packlen, lladdroptlen = 0;
908 char *buf;
909 struct nd_router_advert *ra;
910 struct nd_opt_prefix_info *ndopt_pi;
911 struct nd_opt_mtu *ndopt_mtu;
912 #ifdef ROUTEINFO
913 struct nd_opt_route_info *ndopt_rti;
914 struct rtinfo *rti;
915 #endif
916 struct prefix *pfx;
917
918 /* calculate total length */
919 packlen = sizeof(struct nd_router_advert);
920 if (rainfo->advlinkopt) {
921 if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) {
922 syslog(LOG_INFO,
923 "<%s> link-layer address option has"
924 " null length on %s. Treat as not included.",
925 __func__, rainfo->ifname);
926 rainfo->advlinkopt = 0;
927 }
928 packlen += lladdroptlen;
929 }
930 if (rainfo->pfxs)
931 packlen += sizeof(struct nd_opt_prefix_info) * rainfo->pfxs;
932 if (rainfo->linkmtu)
933 packlen += sizeof(struct nd_opt_mtu);
934 #ifdef ROUTEINFO
935 for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next)
936 packlen += sizeof(struct nd_opt_route_info) +
937 ((rti->prefixlen + 0x3f) >> 6) * 8;
938 #endif
939
940 /* allocate memory for the packet */
941 if ((buf = malloc(packlen)) == NULL) {
942 syslog(LOG_ERR,
943 "<%s> can't get enough memory for an RA packet",
944 __func__);
945 exit(1);
946 }
947 if (rainfo->ra_data) {
948 /* free the previous packet */
949 free(rainfo->ra_data);
950 rainfo->ra_data = NULL;
951 }
952 rainfo->ra_data = buf;
953 /* XXX: what if packlen > 576? */
954 rainfo->ra_datalen = packlen;
955
956 /*
957 * construct the packet
958 */
959 ra = (struct nd_router_advert *)buf;
960 ra->nd_ra_type = ND_ROUTER_ADVERT;
961 ra->nd_ra_code = 0;
962 ra->nd_ra_cksum = 0;
963 ra->nd_ra_curhoplimit = (u_int8_t)(0xff & rainfo->hoplimit);
964 ra->nd_ra_flags_reserved = 0; /* just in case */
965 /*
966 * XXX: the router preference field, which is a 2-bit field, should be
967 * initialized before other fields.
968 */
969 ra->nd_ra_flags_reserved = 0xff & rainfo->rtpref;
970 ra->nd_ra_flags_reserved |=
971 rainfo->managedflg ? ND_RA_FLAG_MANAGED : 0;
972 ra->nd_ra_flags_reserved |=
973 rainfo->otherflg ? ND_RA_FLAG_OTHER : 0;
974 ra->nd_ra_router_lifetime = htons(rainfo->lifetime);
975 ra->nd_ra_reachable = htonl(rainfo->reachabletime);
976 ra->nd_ra_retransmit = htonl(rainfo->retranstimer);
977 buf += sizeof(*ra);
978
979 if (rainfo->advlinkopt) {
980 lladdropt_fill(rainfo->sdl, (struct nd_opt_hdr *)buf);
981 buf += lladdroptlen;
982 }
983
984 if (rainfo->linkmtu) {
985 ndopt_mtu = (struct nd_opt_mtu *)buf;
986 ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU;
987 ndopt_mtu->nd_opt_mtu_len = 1;
988 ndopt_mtu->nd_opt_mtu_reserved = 0;
989 ndopt_mtu->nd_opt_mtu_mtu = htonl(rainfo->linkmtu);
990 buf += sizeof(struct nd_opt_mtu);
991 }
992
993 for (pfx = rainfo->prefix.next;
994 pfx != &rainfo->prefix; pfx = pfx->next) {
995 u_int32_t vltime, pltime;
996 struct timeval now;
997
998 ndopt_pi = (struct nd_opt_prefix_info *)buf;
999 ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
1000 ndopt_pi->nd_opt_pi_len = 4;
1001 ndopt_pi->nd_opt_pi_prefix_len = pfx->prefixlen;
1002 ndopt_pi->nd_opt_pi_flags_reserved = 0;
1003 if (pfx->onlinkflg)
1004 ndopt_pi->nd_opt_pi_flags_reserved |=
1005 ND_OPT_PI_FLAG_ONLINK;
1006 if (pfx->autoconfflg)
1007 ndopt_pi->nd_opt_pi_flags_reserved |=
1008 ND_OPT_PI_FLAG_AUTO;
1009 if (pfx->timer)
1010 vltime = 0;
1011 else {
1012 if (pfx->vltimeexpire || pfx->pltimeexpire)
1013 gettimeofday(&now, NULL);
1014 if (pfx->vltimeexpire == 0)
1015 vltime = pfx->validlifetime;
1016 else
1017 vltime = (pfx->vltimeexpire > now.tv_sec) ?
1018 pfx->vltimeexpire - now.tv_sec : 0;
1019 }
1020 if (pfx->timer)
1021 pltime = 0;
1022 else {
1023 if (pfx->pltimeexpire == 0)
1024 pltime = pfx->preflifetime;
1025 else
1026 pltime = (pfx->pltimeexpire > now.tv_sec) ?
1027 pfx->pltimeexpire - now.tv_sec : 0;
1028 }
1029 if (vltime < pltime) {
1030 /*
1031 * this can happen if vltime is decrement but pltime
1032 * is not.
1033 */
1034 pltime = vltime;
1035 }
1036 ndopt_pi->nd_opt_pi_valid_time = htonl(vltime);
1037 ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime);
1038 ndopt_pi->nd_opt_pi_reserved2 = 0;
1039 ndopt_pi->nd_opt_pi_prefix = pfx->prefix;
1040
1041 buf += sizeof(struct nd_opt_prefix_info);
1042 }
1043
1044 #ifdef ROUTEINFO
1045 for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next) {
1046 u_int8_t psize = (rti->prefixlen + 0x3f) >> 6;
1047
1048 ndopt_rti = (struct nd_opt_route_info *)buf;
1049 ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO;
1050 ndopt_rti->nd_opt_rti_len = 1 + psize;
1051 ndopt_rti->nd_opt_rti_prefixlen = rti->prefixlen;
1052 ndopt_rti->nd_opt_rti_flags = 0xff & rti->rtpref;
1053 ndopt_rti->nd_opt_rti_lifetime = htonl(rti->ltime);
1054 memcpy(ndopt_rti + 1, &rti->prefix, psize * 8);
1055 buf += sizeof(struct nd_opt_route_info) + psize * 8;
1056 }
1057 #endif
1058
1059 return;
1060 }
1061
1062 static int
1063 getinet6sysctl(int code)
1064 {
1065 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
1066 int value;
1067 size_t size;
1068
1069 mib[3] = code;
1070 size = sizeof(value);
1071 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
1072 < 0) {
1073 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
1074 __func__, code,
1075 strerror(errno));
1076 return(-1);
1077 }
1078 else
1079 return(value);
1080 }
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