1 /* $NetBSD: config.c,v 1.43 2019/11/11 13:42:49 roy Exp $ */ 2 /* $KAME: config.c,v 1.93 2005/10/17 14:40:02 suz 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/route.h> 41 #include <net/if_dl.h> 42 #ifdef __FreeBSD__ 43 #include <net/if_var.h> 44 #endif 45 46 #include <netinet/in.h> 47 #include <netinet/in_var.h> 48 #include <netinet/ip6.h> 49 #include <netinet6/ip6_var.h> 50 #include <netinet/icmp6.h> 51 #include <netinet6/nd6.h> 52 53 #include <arpa/inet.h> 54 55 #include <stdio.h> 56 #include <syslog.h> 57 #include <errno.h> 58 #include <string.h> 59 #include <stdlib.h> 60 #include <search.h> 61 #include <unistd.h> 62 #include <ifaddrs.h> 63 #include <inttypes.h> 64 65 #include "rtadvd.h" 66 #include "advcap.h" 67 #include "timer.h" 68 #include "if.h" 69 #include "config.h" 70 #include "logit.h" 71 #include "prog_ops.h" 72 73 #ifndef __arraycount 74 #define __arraycount(__x) (sizeof(__x) / sizeof(__x[0])) 75 #endif 76 77 static time_t prefix_timo = (60 * 120); /* 2 hours. 78 * XXX: should be configurable. */ 79 static struct rtadvd_timer *prefix_timeout(void *); 80 static void makeentry(char *, size_t, int, const char *); 81 static int getinet6sysctl(int); 82 83 static size_t 84 encode_domain(char *dst, const char *src) 85 { 86 ssize_t len; 87 char *odst, *p; 88 89 odst = dst; 90 while (src && (len = strlen(src)) != 0) { 91 p = strchr(src, '.'); 92 *dst++ = len = MIN(63, p == NULL ? len : p - src); 93 memcpy(dst, src, len); 94 dst += len; 95 if (p == NULL) 96 break; 97 src = p + 1; 98 } 99 *dst++ = '\0'; 100 101 return dst - odst; 102 } 103 104 void 105 free_rainfo(struct rainfo *rai) 106 { 107 struct soliciter *sol; 108 struct prefix *pfx; 109 struct rtinfo *rti; 110 struct rdnss *rdnss; 111 struct rdnss_addr *rdnsa; 112 struct dnssl *dnssl; 113 struct dnssl_domain *dnsd; 114 115 rtadvd_remove_timer(&rai->timer); 116 rtadvd_remove_timer(&rai->timer_sol); 117 118 while ((sol = TAILQ_FIRST(&rai->soliciter))) { 119 TAILQ_REMOVE(&rai->soliciter, sol, next); 120 free(sol); 121 } 122 123 while ((pfx = TAILQ_FIRST(&rai->prefix))) { 124 TAILQ_REMOVE(&rai->prefix, pfx, next); 125 free(pfx); 126 } 127 128 while ((rti = TAILQ_FIRST(&rai->route))) { 129 TAILQ_REMOVE(&rai->route, rti, next); 130 free(rti); 131 } 132 133 while ((rdnss = TAILQ_FIRST(&rai->rdnss))) { 134 TAILQ_REMOVE(&rai->rdnss, rdnss, next); 135 while ((rdnsa = TAILQ_FIRST(&rdnss->list))) { 136 TAILQ_REMOVE(&rdnss->list, rdnsa, next); 137 free(rdnsa); 138 } 139 free(rdnss); 140 } 141 142 while ((dnssl = TAILQ_FIRST(&rai->dnssl))) { 143 TAILQ_REMOVE(&rai->dnssl, dnssl, next); 144 while ((dnsd = TAILQ_FIRST(&dnssl->list))) { 145 TAILQ_REMOVE(&dnssl->list, dnsd, next); 146 free(dnsd); 147 } 148 free(dnssl); 149 } 150 151 free(rai->sdl); 152 free(rai->ra_data); 153 free(rai); 154 } 155 156 void 157 getconfig(const char *intface, int exithard) 158 { 159 int stat, c, i; 160 char tbuf[BUFSIZ]; 161 struct rainfo *tmp, *rai; 162 int32_t val; 163 int64_t val64; 164 char buf[BUFSIZ]; 165 char *bp = buf; 166 char *addr, *flagstr, *ap; 167 static int forwarding = -1; 168 char entbuf[256], abuf[256]; 169 struct rdnss *rdnss; 170 struct dnssl *dnssl; 171 172 #define MUSTHAVE(var, cap) \ 173 do { \ 174 int64_t t; \ 175 if ((t = agetnum(cap)) < 0) { \ 176 fprintf(stderr, "rtadvd: need %s for interface %s\n", \ 177 cap, intface); \ 178 goto errexit; \ 179 } \ 180 var = t; \ 181 } while (0) 182 #define MAYHAVE(var, cap, def) \ 183 do { \ 184 if ((var = agetnum(cap)) < 0) \ 185 var = def; \ 186 } while (0) 187 #define ELM_MALLOC(p) \ 188 do { \ 189 p = calloc(1, sizeof(*p)); \ 190 if (p == NULL) { \ 191 logit(LOG_ERR, "<%s> calloc failed: %m", \ 192 __func__); \ 193 goto errexit; \ 194 } \ 195 } while(/*CONSTCOND*/0) 196 197 if (if_nametoindex(intface) == 0) { 198 logit(LOG_INFO, "<%s> interface %s not found, ignoring", 199 __func__, intface); 200 return; 201 } 202 203 logit(LOG_DEBUG, "<%s> loading configuration for interface %s", 204 __func__, intface); 205 206 if ((stat = agetent(tbuf, intface)) <= 0) { 207 memset(tbuf, 0, sizeof(tbuf)); 208 logit(LOG_INFO, 209 "<%s> %s isn't defined in the configuration file" 210 " or the configuration file doesn't exist." 211 " Treat it as default", 212 __func__, intface); 213 } 214 215 ELM_MALLOC(tmp); 216 TAILQ_INIT(&tmp->soliciter); 217 TAILQ_INIT(&tmp->prefix); 218 TAILQ_INIT(&tmp->route); 219 TAILQ_INIT(&tmp->rdnss); 220 TAILQ_INIT(&tmp->dnssl); 221 222 /* check if we are allowed to forward packets (if not determined) */ 223 if (forwarding < 0) { 224 if ((forwarding = getinet6sysctl(IPV6CTL_FORWARDING)) < 0) 225 exit(1); 226 } 227 228 /* get interface information */ 229 if (agetflag("nolladdr")) 230 tmp->advlinkopt = 0; 231 else 232 tmp->advlinkopt = 1; 233 if (tmp->advlinkopt) { 234 if ((tmp->sdl = if_nametosdl(intface)) == NULL) { 235 logit(LOG_ERR, 236 "<%s> can't get information of %s", 237 __func__, intface); 238 goto errexit; 239 } 240 tmp->ifindex = tmp->sdl->sdl_index; 241 } else { 242 tmp->ifindex = if_nametoindex(intface); 243 if (tmp->ifindex == 0) { 244 logit(LOG_ERR, 245 "<%s> can't get information of %s", 246 __func__, intface); 247 goto errexit; 248 } 249 } 250 tmp->ifflags = if_getflags(tmp->ifindex, 0); 251 strlcpy(tmp->ifname, intface, sizeof(tmp->ifname)); 252 if ((tmp->phymtu = if_getmtu(intface)) == 0) { 253 tmp->phymtu = IPV6_MMTU; 254 logit(LOG_WARNING, 255 "<%s> can't get interface mtu of %s. Treat as %d", 256 __func__, intface, IPV6_MMTU); 257 } 258 259 /* 260 * set router configuration variables. 261 */ 262 MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL); 263 if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) { 264 logit(LOG_ERR, 265 "<%s> maxinterval (%d) on %s is invalid " 266 "(must be between %u and %u)", __func__, val, 267 intface, MIN_MAXINTERVAL, MAX_MAXINTERVAL); 268 goto errexit; 269 } 270 tmp->maxinterval = val; 271 MAYHAVE(val, "mininterval", tmp->maxinterval/3); 272 if (val < MIN_MININTERVAL || val > (tmp->maxinterval * 3) / 4) { 273 logit(LOG_ERR, 274 "<%s> mininterval (%d) on %s is invalid " 275 "(must be between %u and %d)", 276 __func__, val, intface, MIN_MININTERVAL, 277 (tmp->maxinterval * 3) / 4); 278 goto errexit; 279 } 280 tmp->mininterval = val; 281 282 MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT); 283 tmp->hoplimit = val & 0xff; 284 285 if ((flagstr = (char *)agetstr("raflags", &bp))) { 286 val = 0; 287 if (strchr(flagstr, 'm')) 288 val |= ND_RA_FLAG_MANAGED; 289 if (strchr(flagstr, 'o')) 290 val |= ND_RA_FLAG_OTHER; 291 if (strchr(flagstr, 'h')) 292 val |= ND_RA_FLAG_RTPREF_HIGH; 293 if (strchr(flagstr, 'l')) { 294 if ((val & ND_RA_FLAG_RTPREF_HIGH)) { 295 logit(LOG_ERR, "<%s> the \'h\' and \'l\'" 296 " router flags are exclusive", __func__); 297 goto errexit; 298 } 299 val |= ND_RA_FLAG_RTPREF_LOW; 300 } 301 } else { 302 MAYHAVE(val, "raflags", 0); 303 } 304 tmp->managedflg = val & ND_RA_FLAG_MANAGED; 305 tmp->otherflg = val & ND_RA_FLAG_OTHER; 306 #ifndef ND_RA_FLAG_RTPREF_MASK 307 #define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */ 308 #define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */ 309 #endif 310 tmp->rtpref = val & ND_RA_FLAG_RTPREF_MASK; 311 if (tmp->rtpref == ND_RA_FLAG_RTPREF_RSV) { 312 logit(LOG_ERR, "<%s> invalid router preference (%02x) on %s", 313 __func__, tmp->rtpref, intface); 314 goto errexit; 315 } 316 317 MAYHAVE(val, "rltime", DEF_ADVROUTERLIFETIME); 318 if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) { 319 logit(LOG_ERR, 320 "<%s> router lifetime (%d) on %s is invalid " 321 "(must be 0 or between %d and %d)", 322 __func__, val, intface, 323 tmp->maxinterval, MAXROUTERLIFETIME); 324 goto errexit; 325 } 326 /* 327 * Basically, hosts MUST NOT send Router Advertisement messages at any 328 * time (RFC 2461, Section 6.2.3). However, it would sometimes be 329 * useful to allow hosts to advertise some parameters such as prefix 330 * information and link MTU. Thus, we allow hosts to invoke rtadvd 331 * only when router lifetime (on every advertising interface) is 332 * explicitly set zero. (see also the above section) 333 */ 334 if (val && forwarding == 0) { 335 logit(LOG_ERR, 336 "<%s> non zero router lifetime is specified for %s, " 337 "which must not be allowed for hosts. you must " 338 "change router lifetime or enable IPv6 forwarding.", 339 __func__, intface); 340 goto errexit; 341 } 342 tmp->lifetime = val & 0xffff; 343 344 MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME); 345 if (val < 0 || val > MAXREACHABLETIME) { 346 logit(LOG_ERR, 347 "<%s> reachable time (%d) on %s is invalid " 348 "(must be no greater than %d)", 349 __func__, val, intface, MAXREACHABLETIME); 350 goto errexit; 351 } 352 tmp->reachabletime = (uint32_t)val; 353 354 MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER); 355 if (val64 < 0 || val64 > 0xffffffff) { 356 logit(LOG_ERR, "<%s> retrans time (%lld) on %s out of range", 357 __func__, (long long)val64, intface); 358 goto errexit; 359 } 360 tmp->retranstimer = (uint32_t)val64; 361 362 if (agetnum("hapref") != -1 || agetnum("hatime") != -1) { 363 logit(LOG_ERR, 364 "<%s> mobile-ip6 configuration not supported", 365 __func__); 366 goto errexit; 367 } 368 /* prefix information */ 369 370 /* 371 * This is an implementation specific parameter to consider 372 * link propagation delays and poorly synchronized clocks when 373 * checking consistency of advertised lifetimes. 374 */ 375 MAYHAVE(val, "clockskew", 0); 376 tmp->clockskew = val; 377 378 tmp->pfxs = 0; 379 for (i = -1; i < MAXPREFIX; i++) { 380 struct prefix *pfx; 381 382 makeentry(entbuf, sizeof(entbuf), i, "addr"); 383 addr = (char *)agetstr(entbuf, &bp); 384 if (addr == NULL) 385 continue; 386 387 /* allocate memory to store prefix information */ 388 if ((pfx = calloc(1, sizeof(*pfx))) == NULL) { 389 logit(LOG_ERR, 390 "<%s> can't allocate memory: %m", 391 __func__); 392 goto errexit; 393 } 394 395 TAILQ_INSERT_TAIL(&tmp->prefix, pfx, next); 396 tmp->pfxs++; 397 pfx->rainfo = tmp; 398 399 pfx->origin = PREFIX_FROM_CONFIG; 400 401 if (inet_pton(AF_INET6, addr, &pfx->prefix) != 1) { 402 logit(LOG_ERR, 403 "<%s> inet_pton failed for %s", 404 __func__, addr); 405 goto errexit; 406 } 407 if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) { 408 logit(LOG_ERR, 409 "<%s> multicast prefix (%s) must " 410 "not be advertised on %s", 411 __func__, addr, intface); 412 goto errexit; 413 } 414 if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix)) 415 logit(LOG_NOTICE, 416 "<%s> link-local prefix (%s) will be" 417 " advertised on %s", 418 __func__, addr, intface); 419 420 makeentry(entbuf, sizeof(entbuf), i, "prefixlen"); 421 MAYHAVE(val, entbuf, 64); 422 if (val < 0 || val > 128) { 423 logit(LOG_ERR, "<%s> prefixlen (%d) for %s " 424 "on %s out of range", 425 __func__, val, addr, intface); 426 goto errexit; 427 } 428 pfx->prefixlen = (int)val; 429 430 makeentry(entbuf, sizeof(entbuf), i, "pinfoflags"); 431 if ((flagstr = (char *)agetstr(entbuf, &bp))) { 432 val = 0; 433 if (strchr(flagstr, 'l')) 434 val |= ND_OPT_PI_FLAG_ONLINK; 435 if (strchr(flagstr, 'a')) 436 val |= ND_OPT_PI_FLAG_AUTO; 437 } else { 438 MAYHAVE(val, entbuf, 439 (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO)); 440 } 441 pfx->onlinkflg = val & ND_OPT_PI_FLAG_ONLINK; 442 pfx->autoconfflg = val & ND_OPT_PI_FLAG_AUTO; 443 444 makeentry(entbuf, sizeof(entbuf), i, "vltime"); 445 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME); 446 if (val64 < 0 || val64 > 0xffffffff) { 447 logit(LOG_ERR, "<%s> vltime (%lld) for " 448 "%s/%d on %s is out of range", 449 __func__, (long long)val64, 450 addr, pfx->prefixlen, intface); 451 goto errexit; 452 } 453 pfx->validlifetime = (uint32_t)val64; 454 455 makeentry(entbuf, sizeof(entbuf), i, "vltimedecr"); 456 if (agetflag(entbuf)) { 457 struct timespec now; 458 prog_clock_gettime(CLOCK_MONOTONIC, &now); 459 pfx->vltimeexpire = 460 now.tv_sec + pfx->validlifetime; 461 } 462 463 makeentry(entbuf, sizeof(entbuf), i, "pltime"); 464 MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME); 465 if (val64 < 0 || val64 > 0xffffffff) { 466 logit(LOG_ERR, 467 "<%s> pltime (%lld) for %s/%d on %s " 468 "is out of range", 469 __func__, (long long)val64, 470 addr, pfx->prefixlen, intface); 471 goto errexit; 472 } 473 pfx->preflifetime = (uint32_t)val64; 474 475 makeentry(entbuf, sizeof(entbuf), i, "pltimedecr"); 476 if (agetflag(entbuf)) { 477 struct timespec now; 478 prog_clock_gettime(CLOCK_MONOTONIC, &now); 479 pfx->pltimeexpire = 480 now.tv_sec + pfx->preflifetime; 481 } 482 } 483 if (TAILQ_FIRST(&tmp->prefix) == NULL && !agetflag("noifprefix")) 484 get_prefix(tmp); 485 486 MAYHAVE(val64, "mtu", 0); 487 if (val64 < 0 || val64 > 0xffffffff) { 488 logit(LOG_ERR, 489 "<%s> mtu (%" PRIi64 ") on %s out of range", 490 __func__, val64, intface); 491 goto errexit; 492 } 493 tmp->linkmtu = (uint32_t)val64; 494 if (tmp->linkmtu == 0) { 495 char *mtustr; 496 497 if ((mtustr = (char *)agetstr("mtu", &bp)) && 498 strcmp(mtustr, "auto") == 0) 499 tmp->linkmtu = tmp->phymtu; 500 } 501 else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) { 502 logit(LOG_ERR, 503 "<%s> advertised link mtu (%d) on %s is invalid (must " 504 "be between least MTU (%d) and physical link MTU (%d)", 505 __func__, tmp->linkmtu, intface, 506 IPV6_MMTU, tmp->phymtu); 507 goto errexit; 508 } 509 510 /* route information */ 511 for (i = -1; i < MAXROUTE; i++) { 512 struct rtinfo *rti; 513 char oentbuf[256]; 514 515 makeentry(entbuf, sizeof(entbuf), i, "rtprefix"); 516 addr = (char *)agetstr(entbuf, &bp); 517 if (addr == NULL) { 518 makeentry(oentbuf, sizeof(oentbuf), i, "rtrprefix"); 519 addr = (char *)agetstr(oentbuf, &bp); 520 if (addr) { 521 fprintf(stderr, "%s was obsoleted. Use %s.\n", 522 oentbuf, entbuf); 523 } 524 } 525 if (addr == NULL) 526 continue; 527 528 ELM_MALLOC(rti); 529 memset(rti, 0, sizeof(*rti)); 530 531 /* link into chain */ 532 TAILQ_INSERT_TAIL(&tmp->route, rti, next); 533 534 if (inet_pton(AF_INET6, addr, &rti->prefix) != 1) { 535 logit(LOG_ERR, "<%s> inet_pton failed for %s", 536 __func__, addr); 537 goto errexit; 538 } 539 #if 0 540 /* 541 * XXX: currently there's no restriction in route information 542 * prefix according to 543 * draft-ietf-ipngwg-router-selection-00.txt. 544 * However, I think the similar restriction be necessary. 545 */ 546 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME); 547 if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) { 548 logit(LOG_ERR, 549 "<%s> multicast route (%s) must " 550 "not be advertised on %s", 551 __func__, addr, intface); 552 goto errexit; 553 } 554 if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) { 555 logit(LOG_NOTICE, 556 "<%s> link-local route (%s) will " 557 "be advertised on %s", 558 __func__, addr, intface); 559 goto errexit; 560 } 561 #endif 562 563 makeentry(entbuf, sizeof(entbuf), i, "rtplen"); 564 /* XXX: 256 is a magic number for compatibility check. */ 565 MAYHAVE(val, entbuf, 256); 566 if (val == 256) { 567 makeentry(oentbuf, sizeof(oentbuf), i, "rtrplen"); 568 MAYHAVE(val, oentbuf, 256); 569 if (val != 256) { 570 fprintf(stderr, "%s was obsoleted. Use %s.\n", 571 oentbuf, entbuf); 572 } else 573 val = 64; 574 } 575 if (val < 0 || val > 128) { 576 logit(LOG_ERR, "<%s> prefixlen (%d) for %s on %s " 577 "out of range", 578 __func__, val, addr, intface); 579 goto errexit; 580 } 581 rti->prefixlen = (int)val; 582 583 makeentry(entbuf, sizeof(entbuf), i, "rtflags"); 584 if ((flagstr = (char *)agetstr(entbuf, &bp))) { 585 val = 0; 586 if (strchr(flagstr, 'h')) 587 val |= ND_RA_FLAG_RTPREF_HIGH; 588 if (strchr(flagstr, 'l')) { 589 if ((val & ND_RA_FLAG_RTPREF_HIGH)) { 590 logit(LOG_ERR, 591 "<%s> the \'h\' and \'l\' route" 592 " preferences are exclusive", 593 __func__); 594 goto errexit; 595 } 596 val |= ND_RA_FLAG_RTPREF_LOW; 597 } 598 } else 599 MAYHAVE(val, entbuf, 256); /* XXX */ 600 if (val == 256) { 601 makeentry(oentbuf, sizeof(oentbuf), i, "rtrflags"); 602 MAYHAVE(val, oentbuf, 256); 603 if (val != 256) { 604 fprintf(stderr, "%s was obsoleted. Use %s.\n", 605 oentbuf, entbuf); 606 } else 607 val = 0; 608 } 609 rti->rtpref = val & ND_RA_FLAG_RTPREF_MASK; 610 if (rti->rtpref == ND_RA_FLAG_RTPREF_RSV) { 611 logit(LOG_ERR, "<%s> invalid route preference (%02x) " 612 "for %s/%d on %s", 613 __func__, rti->rtpref, addr, 614 rti->prefixlen, intface); 615 goto errexit; 616 } 617 618 /* 619 * Since the spec does not a default value, we should make 620 * this entry mandatory. However, FreeBSD 4.4 has shipped 621 * with this field being optional, we use the router lifetime 622 * as an ad-hoc default value with a warning message. 623 */ 624 makeentry(entbuf, sizeof(entbuf), i, "rtltime"); 625 MAYHAVE(val64, entbuf, -1); 626 if (val64 == -1) { 627 makeentry(oentbuf, sizeof(oentbuf), i, "rtrltime"); 628 MAYHAVE(val64, oentbuf, -1); 629 if (val64 != -1) { 630 fprintf(stderr, "%s was obsoleted. Use %s.\n", 631 oentbuf, entbuf); 632 } else { 633 fprintf(stderr, "%s should be specified " 634 "for interface %s.\n", 635 entbuf, intface); 636 val64 = tmp->lifetime; 637 } 638 } 639 if (val64 < 0 || val64 > 0xffffffff) { 640 logit(LOG_ERR, "<%s> route lifetime (%lld) for " 641 "%s/%d on %s out of range", __func__, 642 (long long)val64, addr, rti->prefixlen, intface); 643 goto errexit; 644 } 645 rti->ltime = (uint32_t)val64; 646 } 647 648 /* RDNSS */ 649 for (i = -1; i < MAXRDNSS; i++) { 650 struct rdnss_addr *rdnsa; 651 652 makeentry(entbuf, sizeof(entbuf), i, "rdnss"); 653 addr = (char *)agetstr(entbuf, &bp); 654 if (addr == NULL) 655 continue; 656 657 ELM_MALLOC(rdnss); 658 TAILQ_INSERT_TAIL(&tmp->rdnss, rdnss, next); 659 TAILQ_INIT(&rdnss->list); 660 661 for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) { 662 c = strcspn(ap, ","); 663 strncpy(abuf, ap, c); 664 abuf[c] = '\0'; 665 ELM_MALLOC(rdnsa); 666 TAILQ_INSERT_TAIL(&rdnss->list, rdnsa, next); 667 if (inet_pton(AF_INET6, abuf, &rdnsa->addr) != 1) { 668 logit(LOG_ERR, "<%s> inet_pton failed for %s", 669 __func__, addr); 670 goto errexit; 671 } 672 } 673 674 makeentry(entbuf, sizeof(entbuf), i, "rdnssltime"); 675 MAYHAVE(val64, entbuf, tmp->maxinterval * 3 / 2); 676 if (val64 < 0 || val64 > 0xffffffff) { 677 logit(LOG_ERR, "<%s> %s (%lld) on %s is invalid", 678 __func__, entbuf, (long long)val64, intface); 679 goto errexit; 680 } 681 rdnss->lifetime = (uint32_t)val64; 682 683 } 684 685 /* DNSSL */ 686 TAILQ_INIT(&tmp->dnssl); 687 for (i = -1; i < MAXDNSSL; i++) { 688 struct dnssl_domain *dnsd; 689 690 makeentry(entbuf, sizeof(entbuf), i, "dnssl"); 691 addr = (char *)agetstr(entbuf, &bp); 692 if (addr == NULL) 693 continue; 694 695 ELM_MALLOC(dnssl); 696 TAILQ_INSERT_TAIL(&tmp->dnssl, dnssl, next); 697 TAILQ_INIT(&dnssl->list); 698 699 for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) { 700 c = strcspn(ap, ","); 701 strncpy(abuf, ap, c); 702 abuf[c] = '\0'; 703 ELM_MALLOC(dnsd); 704 TAILQ_INSERT_TAIL(&dnssl->list, dnsd, next); 705 dnsd->len = encode_domain(dnsd->domain, abuf); 706 } 707 708 makeentry(entbuf, sizeof(entbuf), i, "dnsslltime"); 709 MAYHAVE(val64, entbuf, tmp->maxinterval * 3 / 2); 710 if (val64 < 0 || val64 > 0xffffffff) { 711 logit(LOG_ERR, "<%s> %s (%lld) on %s is invalid", 712 __func__, entbuf, (long long)val64, intface); 713 goto errexit; 714 } 715 dnssl->lifetime = (uint32_t)val64; 716 717 } 718 719 TAILQ_FOREACH(rai, &ralist, next) { 720 if (rai->ifindex == tmp->ifindex) { 721 TAILQ_REMOVE(&ralist, rai, next); 722 if (Cflag) { 723 free_rainfo(rai); 724 rai = NULL; 725 break; 726 } 727 /* If we already have a leaving RA use that 728 * as this config hasn't been advertised */ 729 if (rai->leaving) { 730 tmp->leaving = rai->leaving; 731 free_rainfo(rai); 732 rai = tmp->leaving; 733 rai->leaving_for = tmp; 734 break; 735 } 736 rai->lifetime = 0; 737 TAILQ_FOREACH(rdnss, &rai->rdnss, next) 738 rdnss->lifetime = 0; 739 TAILQ_FOREACH(dnssl, &rai->dnssl, next) 740 dnssl->lifetime = 0; 741 rai->leaving_for = tmp; 742 tmp->leaving = rai; 743 rai->initcounter = MAX_INITIAL_RTR_ADVERTISEMENTS; 744 rai->mininterval = MIN_DELAY_BETWEEN_RAS; 745 rai->maxinterval = MIN_DELAY_BETWEEN_RAS; 746 rai->leaving_adv = MAX_FINAL_RTR_ADVERTISEMENTS; 747 if (rai->timer == NULL) 748 rai->timer = rtadvd_add_timer(ra_timeout, 749 ra_timer_update, 750 rai, rai); 751 ra_timer_update((void *)rai, &rai->timer->tm); 752 rtadvd_set_timer(&rai->timer->tm, rai->timer); 753 break; 754 } 755 } 756 757 /* okey */ 758 TAILQ_INSERT_TAIL(&ralist, tmp, next); 759 760 /* construct the sending packet */ 761 make_packet(tmp); 762 763 /* set timer */ 764 if (rai) 765 return; 766 tmp->timer = rtadvd_add_timer(ra_timeout, ra_timer_update, 767 tmp, tmp); 768 ra_timer_set_short_delay(tmp, tmp->timer); 769 tmp->timer_sol = rtadvd_add_timer(ra_timeout_sol, NULL, tmp, NULL); 770 771 return; 772 773 errexit: 774 if (exithard) 775 exit(1); 776 free_rainfo(tmp); 777 } 778 779 void 780 get_prefix(struct rainfo *rai) 781 { 782 struct ifaddrs *ifap, *ifa; 783 struct prefix *pp; 784 struct in6_addr *a; 785 unsigned char *p, *ep, *m, *lim; 786 char ntopbuf[INET6_ADDRSTRLEN]; 787 788 if (getifaddrs(&ifap) < 0) { 789 logit(LOG_ERR, 790 "<%s> can't get interface addresses", 791 __func__); 792 exit(1); 793 } 794 795 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 796 int plen; 797 798 if (strcmp(ifa->ifa_name, rai->ifname) != 0) 799 continue; 800 if (ifa->ifa_addr->sa_family != AF_INET6) 801 continue; 802 a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 803 if (IN6_IS_ADDR_LINKLOCAL(a)) 804 continue; 805 /* get prefix length */ 806 m = (unsigned char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 807 lim = (unsigned char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len; 808 plen = prefixlen(m, lim); 809 if (plen <= 0 || plen > 128) { 810 logit(LOG_ERR, "<%s> failed to get prefixlen " 811 "or prefix is invalid", 812 __func__); 813 exit(1); 814 } 815 if (plen == 128) /* XXX */ 816 continue; 817 if (find_prefix(rai, a, plen)) { 818 /* ignore a duplicated prefix. */ 819 continue; 820 } 821 822 /* allocate memory to store prefix info. */ 823 if ((pp = calloc(1, sizeof(*pp))) == NULL) { 824 logit(LOG_ERR, 825 "<%s> can't get allocate buffer for prefix", 826 __func__); 827 exit(1); 828 } 829 830 /* set prefix, sweep bits outside of prefixlen */ 831 pp->prefixlen = plen; 832 memcpy(&pp->prefix, a, sizeof(*a)); 833 if (1) 834 { 835 p = (unsigned char *)&pp->prefix; 836 ep = (unsigned char *)(&pp->prefix + 1); 837 while (m < lim && p < ep) 838 *p++ &= *m++; 839 while (p < ep) 840 *p++ = 0x00; 841 } 842 if (!inet_ntop(AF_INET6, &pp->prefix, ntopbuf, 843 sizeof(ntopbuf))) { 844 logit(LOG_ERR, "<%s> inet_ntop failed", __func__); 845 exit(1); 846 } 847 logit(LOG_DEBUG, 848 "<%s> add %s/%d to prefix list on %s", 849 __func__, ntopbuf, pp->prefixlen, rai->ifname); 850 851 /* set other fields with protocol defaults */ 852 pp->validlifetime = DEF_ADVVALIDLIFETIME; 853 pp->preflifetime = DEF_ADVPREFERREDLIFETIME; 854 pp->onlinkflg = 1; 855 pp->autoconfflg = 1; 856 pp->origin = PREFIX_FROM_KERNEL; 857 pp->rainfo = rai; 858 859 /* link into chain */ 860 TAILQ_INSERT_TAIL(&rai->prefix, pp, next); 861 rai->pfxs++; 862 } 863 864 freeifaddrs(ifap); 865 } 866 867 static void 868 makeentry(char *buf, size_t len, int id, const char *string) 869 { 870 871 if (id < 0) 872 strlcpy(buf, string, len); 873 else 874 snprintf(buf, len, "%s%d", string, id); 875 } 876 877 /* 878 * Add a prefix to the list of specified interface and reconstruct 879 * the outgoing packet. 880 * The prefix must not be in the list. 881 * XXX: other parameters of the prefix(e.g. lifetime) should be 882 * able to be specified. 883 */ 884 static void 885 add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr) 886 { 887 struct prefix *prefix; 888 char ntopbuf[INET6_ADDRSTRLEN]; 889 890 if ((prefix = calloc(1, sizeof(*prefix))) == NULL) { 891 logit(LOG_ERR, "<%s> memory allocation failed", 892 __func__); 893 return; /* XXX: error or exit? */ 894 } 895 prefix->prefix = ipr->ipr_prefix.sin6_addr; 896 prefix->prefixlen = ipr->ipr_plen; 897 prefix->validlifetime = ipr->ipr_vltime; 898 prefix->preflifetime = ipr->ipr_pltime; 899 prefix->onlinkflg = ipr->ipr_raf_onlink; 900 prefix->autoconfflg = ipr->ipr_raf_auto; 901 prefix->origin = PREFIX_FROM_DYNAMIC; 902 903 prefix->rainfo = rai; 904 TAILQ_INSERT_TAIL(&rai->prefix, prefix, next); 905 rai->pfxs++; 906 907 logit(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s", 908 __func__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, 909 ntopbuf, INET6_ADDRSTRLEN), 910 ipr->ipr_plen, rai->ifname); 911 912 /* free the previous packet */ 913 free(rai->ra_data); 914 rai->ra_data = NULL; 915 916 /* reconstruct the packet */ 917 make_packet(rai); 918 } 919 920 /* 921 * Delete a prefix to the list of specified interface and reconstruct 922 * the outgoing packet. 923 * The prefix must be in the list. 924 */ 925 void 926 delete_prefix(struct prefix *prefix) 927 { 928 char ntopbuf[INET6_ADDRSTRLEN]; 929 struct rainfo *rai = prefix->rainfo; 930 931 TAILQ_REMOVE(&rai->prefix, prefix, next); 932 rai->pfxs--; 933 logit(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s", 934 __func__, inet_ntop(AF_INET6, &prefix->prefix, 935 ntopbuf, INET6_ADDRSTRLEN), 936 prefix->prefixlen, rai->ifname); 937 rtadvd_remove_timer(&prefix->timer); 938 free(prefix); 939 } 940 941 void 942 invalidate_prefix(struct prefix *prefix) 943 { 944 char ntopbuf[INET6_ADDRSTRLEN]; 945 struct timespec timo; 946 struct rainfo *rai = prefix->rainfo; 947 948 if (prefix->timer) { /* sanity check */ 949 logit(LOG_ERR, 950 "<%s> assumption failure: timer already exists", 951 __func__); 952 exit(1); 953 } 954 955 logit(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, " 956 "will expire in %ld seconds", __func__, 957 inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, INET6_ADDRSTRLEN), 958 prefix->prefixlen, rai->ifname, (long)prefix_timo); 959 960 /* set the expiration timer */ 961 prefix->timer = rtadvd_add_timer(prefix_timeout, NULL, prefix, NULL); 962 if (prefix->timer == NULL) { 963 logit(LOG_ERR, "<%s> failed to add a timer for a prefix. " 964 "remove the prefix", __func__); 965 delete_prefix(prefix); 966 } 967 timo.tv_sec = prefix_timo; 968 timo.tv_nsec = 0; 969 rtadvd_set_timer(&timo, prefix->timer); 970 } 971 972 static struct rtadvd_timer * 973 prefix_timeout(void *arg) 974 { 975 struct prefix *prefix = (struct prefix *)arg; 976 977 delete_prefix(prefix); 978 979 return(NULL); 980 } 981 982 void 983 update_prefix(struct prefix * prefix) 984 { 985 char ntopbuf[INET6_ADDRSTRLEN]; 986 struct rainfo *rai = prefix->rainfo; 987 988 if (prefix->timer == NULL) { /* sanity check */ 989 logit(LOG_ERR, 990 "<%s> assumption failure: timer does not exist", 991 __func__); 992 exit(1); 993 } 994 995 logit(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s", 996 __func__, inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, 997 INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname); 998 999 /* stop the expiration timer */ 1000 rtadvd_remove_timer(&prefix->timer); 1001 } 1002 1003 /* 1004 * Try to get an in6_prefixreq contents for a prefix which matches 1005 * ipr->ipr_prefix and ipr->ipr_plen and belongs to 1006 * the interface whose name is ipr->ipr_name[]. 1007 */ 1008 static int 1009 init_prefix(struct in6_prefixreq *ipr) 1010 { 1011 #if 0 1012 int s; 1013 1014 if ((s = prog_socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1015 logit(LOG_ERR, "<%s> socket: %m", __func__); 1016 exit(1); 1017 } 1018 1019 if (prog_ioctl(s, SIOCGIFPREFIX_IN6, ipr) < 0) { 1020 logit(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX: %m", __func__); 1021 1022 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME; 1023 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME; 1024 ipr->ipr_raf_onlink = 1; 1025 ipr->ipr_raf_auto = 1; 1026 /* omit other field initialization */ 1027 } 1028 else if (ipr->ipr_origin < PR_ORIG_RR) { 1029 char ntopbuf[INET6_ADDRSTRLEN]; 1030 1031 logit(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is" 1032 "lower than PR_ORIG_RR(router renumbering)." 1033 "This should not happen if I am router", __func__, 1034 inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, 1035 sizeof(ntopbuf)), ipr->ipr_origin); 1036 prog_close(s); 1037 return 1; 1038 } 1039 1040 prog_close(s); 1041 return 0; 1042 #else 1043 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME; 1044 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME; 1045 ipr->ipr_raf_onlink = 1; 1046 ipr->ipr_raf_auto = 1; 1047 return 0; 1048 #endif 1049 } 1050 1051 void 1052 make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen) 1053 { 1054 struct in6_prefixreq ipr; 1055 1056 memset(&ipr, 0, sizeof(ipr)); 1057 if (if_indextoname(ifindex, ipr.ipr_name) == NULL) { 1058 logit(LOG_ERR, "<%s> Prefix added interface No.%d doesn't" 1059 "exist. This should not happen: %m", __func__, 1060 ifindex); 1061 exit(1); 1062 } 1063 ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix); 1064 ipr.ipr_prefix.sin6_family = AF_INET6; 1065 ipr.ipr_prefix.sin6_addr = *addr; 1066 ipr.ipr_plen = plen; 1067 1068 if (init_prefix(&ipr)) 1069 return; /* init failed by some error */ 1070 add_prefix(rai, &ipr); 1071 } 1072 1073 void 1074 make_packet(struct rainfo *rainfo) 1075 { 1076 size_t packlen, lladdroptlen = 0; 1077 char *buf; 1078 struct nd_router_advert *ra; 1079 struct nd_opt_prefix_info *ndopt_pi; 1080 struct nd_opt_mtu *ndopt_mtu; 1081 struct prefix *pfx; 1082 struct nd_opt_route_info *ndopt_rti; 1083 struct rtinfo *rti; 1084 struct nd_opt_rdnss *ndopt_rdnss; 1085 struct rdnss *rdns; 1086 struct rdnss_addr *rdnsa; 1087 struct nd_opt_dnssl *ndopt_dnssl; 1088 struct dnssl *dnsl; 1089 struct dnssl_domain *dnsd; 1090 size_t len, plen; 1091 1092 /* calculate total length */ 1093 packlen = sizeof(struct nd_router_advert); 1094 if (rainfo->advlinkopt) { 1095 if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) { 1096 logit(LOG_INFO, 1097 "<%s> link-layer address option has" 1098 " null length on %s. Treat as not included.", 1099 __func__, rainfo->ifname); 1100 rainfo->advlinkopt = 0; 1101 } 1102 packlen += lladdroptlen; 1103 } 1104 if (TAILQ_FIRST(&rainfo->prefix) != NULL) 1105 packlen += sizeof(struct nd_opt_prefix_info) * rainfo->pfxs; 1106 if (rainfo->linkmtu) 1107 packlen += sizeof(struct nd_opt_mtu); 1108 TAILQ_FOREACH(rti, &rainfo->route, next) 1109 packlen += sizeof(struct nd_opt_route_info) + 1110 ((rti->prefixlen + 0x3f) >> 6) * 8; 1111 1112 TAILQ_FOREACH(rdns, &rainfo->rdnss, next) { 1113 packlen += sizeof(struct nd_opt_rdnss); 1114 TAILQ_FOREACH(rdnsa, &rdns->list, next) 1115 packlen += sizeof(rdnsa->addr); 1116 } 1117 TAILQ_FOREACH(dnsl, &rainfo->dnssl, next) { 1118 packlen += sizeof(struct nd_opt_dnssl); 1119 len = 0; 1120 TAILQ_FOREACH(dnsd, &dnsl->list, next) 1121 len += dnsd->len; 1122 len += len % 8 ? 8 - len % 8 : 0; 1123 packlen += len; 1124 } 1125 1126 /* allocate memory for the packet */ 1127 if ((buf = realloc(rainfo->ra_data, packlen)) == NULL) { 1128 logit(LOG_ERR, 1129 "<%s> can't get enough memory for an RA packet %m", 1130 __func__); 1131 exit(1); 1132 } 1133 rainfo->ra_data = buf; 1134 /* XXX: what if packlen > 576? */ 1135 rainfo->ra_datalen = packlen; 1136 #define CHECKLEN(size) \ 1137 do { \ 1138 if (buf + size > rainfo->ra_data + packlen) { \ 1139 logit(LOG_ERR, \ 1140 "<%s, %d> RA packet does not fit in %zu",\ 1141 __func__, __LINE__, packlen); \ 1142 exit(1); \ 1143 } \ 1144 } while (/*CONSTCOND*/0) 1145 /* 1146 * construct the packet 1147 */ 1148 CHECKLEN(sizeof(*ra)); 1149 ra = (struct nd_router_advert *)buf; 1150 ra->nd_ra_type = ND_ROUTER_ADVERT; 1151 ra->nd_ra_code = 0; 1152 ra->nd_ra_cksum = 0; 1153 ra->nd_ra_curhoplimit = (uint8_t)(0xff & rainfo->hoplimit); 1154 ra->nd_ra_flags_reserved = 0; /* just in case */ 1155 /* 1156 * XXX: the router preference field, which is a 2-bit field, should be 1157 * initialized before other fields. 1158 */ 1159 ra->nd_ra_flags_reserved = 0xff & rainfo->rtpref; 1160 ra->nd_ra_flags_reserved |= 1161 rainfo->managedflg ? ND_RA_FLAG_MANAGED : 0; 1162 ra->nd_ra_flags_reserved |= 1163 rainfo->otherflg ? ND_RA_FLAG_OTHER : 0; 1164 ra->nd_ra_router_lifetime = htons(rainfo->lifetime); 1165 ra->nd_ra_reachable = htonl(rainfo->reachabletime); 1166 ra->nd_ra_retransmit = htonl(rainfo->retranstimer); 1167 buf += sizeof(*ra); 1168 1169 if (rainfo->advlinkopt) { 1170 CHECKLEN(sizeof(struct nd_opt_hdr)); 1171 lladdropt_fill(rainfo->sdl, (struct nd_opt_hdr *)buf); 1172 buf += lladdroptlen; 1173 } 1174 1175 if (rainfo->linkmtu) { 1176 CHECKLEN(sizeof(*ndopt_mtu)); 1177 ndopt_mtu = (struct nd_opt_mtu *)buf; 1178 ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU; 1179 ndopt_mtu->nd_opt_mtu_len = 1; 1180 ndopt_mtu->nd_opt_mtu_reserved = 0; 1181 ndopt_mtu->nd_opt_mtu_mtu = htonl(rainfo->linkmtu); 1182 buf += sizeof(struct nd_opt_mtu); 1183 } 1184 1185 TAILQ_FOREACH(pfx, &rainfo->prefix, next) { 1186 uint32_t vltime, pltime; 1187 struct timespec now; 1188 1189 CHECKLEN(sizeof(*ndopt_pi)); 1190 ndopt_pi = (struct nd_opt_prefix_info *)buf; 1191 ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION; 1192 ndopt_pi->nd_opt_pi_len = 4; 1193 ndopt_pi->nd_opt_pi_prefix_len = pfx->prefixlen; 1194 ndopt_pi->nd_opt_pi_flags_reserved = 0; 1195 if (pfx->onlinkflg) 1196 ndopt_pi->nd_opt_pi_flags_reserved |= 1197 ND_OPT_PI_FLAG_ONLINK; 1198 if (pfx->autoconfflg) 1199 ndopt_pi->nd_opt_pi_flags_reserved |= 1200 ND_OPT_PI_FLAG_AUTO; 1201 if (pfx->timer) 1202 vltime = 0; 1203 else { 1204 if (pfx->vltimeexpire || pfx->pltimeexpire) 1205 prog_clock_gettime(CLOCK_MONOTONIC, &now); 1206 if (pfx->vltimeexpire == 0) 1207 vltime = pfx->validlifetime; 1208 else 1209 vltime = (pfx->vltimeexpire > now.tv_sec) ? 1210 pfx->vltimeexpire - now.tv_sec : 0; 1211 } 1212 if (pfx->timer) 1213 pltime = 0; 1214 else { 1215 if (pfx->pltimeexpire == 0) 1216 pltime = pfx->preflifetime; 1217 else 1218 pltime = (pfx->pltimeexpire > now.tv_sec) ? 1219 pfx->pltimeexpire - now.tv_sec : 0; 1220 } 1221 if (vltime < pltime) { 1222 /* 1223 * this can happen if vltime is decrement but pltime 1224 * is not. 1225 */ 1226 pltime = vltime; 1227 } 1228 ndopt_pi->nd_opt_pi_valid_time = htonl(vltime); 1229 ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime); 1230 ndopt_pi->nd_opt_pi_reserved2 = 0; 1231 ndopt_pi->nd_opt_pi_prefix = pfx->prefix; 1232 1233 buf += sizeof(struct nd_opt_prefix_info); 1234 } 1235 1236 TAILQ_FOREACH(rti, &rainfo->route, next) { 1237 uint8_t psize = (rti->prefixlen + 0x3f) >> 6; 1238 1239 CHECKLEN(sizeof(*ndopt_rti)); 1240 ndopt_rti = (struct nd_opt_route_info *)buf; 1241 ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO; 1242 ndopt_rti->nd_opt_rti_len = 1 + psize; 1243 ndopt_rti->nd_opt_rti_prefixlen = rti->prefixlen; 1244 ndopt_rti->nd_opt_rti_flags = 0xff & rti->rtpref; 1245 ndopt_rti->nd_opt_rti_lifetime = htonl(rti->ltime); 1246 memcpy(ndopt_rti + 1, &rti->prefix, psize * 8); 1247 buf += sizeof(struct nd_opt_route_info) + psize * 8; 1248 } 1249 1250 TAILQ_FOREACH(rdns, &rainfo->rdnss, next) { 1251 CHECKLEN(sizeof(*ndopt_rdnss)); 1252 ndopt_rdnss = (struct nd_opt_rdnss *)buf; 1253 ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS; 1254 ndopt_rdnss->nd_opt_rdnss_len = 1; 1255 ndopt_rdnss->nd_opt_rdnss_reserved = 0; 1256 ndopt_rdnss->nd_opt_rdnss_lifetime = htonl(rdns->lifetime); 1257 buf += sizeof(*ndopt_rdnss); 1258 1259 TAILQ_FOREACH(rdnsa, &rdns->list, next) { 1260 CHECKLEN(sizeof(rdnsa->addr)); 1261 memcpy(buf, &rdnsa->addr, sizeof(rdnsa->addr)); 1262 ndopt_rdnss->nd_opt_rdnss_len += 2; 1263 buf += sizeof(rdnsa->addr); 1264 } 1265 } 1266 1267 TAILQ_FOREACH(dnsl, &rainfo->dnssl, next) { 1268 CHECKLEN(sizeof(*ndopt_dnssl)); 1269 ndopt_dnssl = (struct nd_opt_dnssl *)buf; 1270 ndopt_dnssl->nd_opt_dnssl_type = ND_OPT_DNSSL; 1271 ndopt_dnssl->nd_opt_dnssl_len = 0; 1272 ndopt_dnssl->nd_opt_dnssl_reserved = 0; 1273 ndopt_dnssl->nd_opt_dnssl_lifetime = htonl(dnsl->lifetime); 1274 buf += sizeof(*ndopt_dnssl); 1275 1276 TAILQ_FOREACH(dnsd, &dnsl->list, next) { 1277 CHECKLEN(dnsd->len); 1278 memcpy(buf, dnsd->domain, dnsd->len); 1279 buf += dnsd->len; 1280 } 1281 /* Ensure our length is padded correctly */ 1282 len = buf - (char *)ndopt_dnssl; 1283 plen = len % 8 ? 8 - len % 8 : 0; 1284 CHECKLEN(plen); 1285 memset(buf, 0, plen); 1286 buf += plen; 1287 ndopt_dnssl->nd_opt_dnssl_len = (len + plen) / 8; 1288 } 1289 memset(buf, 0, packlen - (buf - rainfo->ra_data)); 1290 } 1291 1292 static int 1293 getinet6sysctl(int code) 1294 { 1295 const int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, code }; 1296 int value; 1297 size_t size; 1298 1299 size = sizeof(value); 1300 if (prog_sysctl(mib, __arraycount(mib), &value, &size, NULL, 0) 1301 < 0) { 1302 logit(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %m", 1303 __func__, code); 1304 return -1; 1305 } 1306 else 1307 return value; 1308 } 1309