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bsd-family-tree: Small sync with FreeBSD.
[dragonfly.git] / usr.sbin / rtadvd / config.c
blobf9b153b5c6e1d8c88384945d0d046d1dd9135174
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
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
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
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
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
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
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 *
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
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
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
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
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
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 *
1199 prefix_timeout(void *arg)
1200 {
1201
1202 delete_prefix((struct prefix *)arg);
1203
1204 return (NULL);
1205 }
1206
1207 void
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
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
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
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 }
DragonFly BSD