config.c revision 301809
1/* $FreeBSD: stable/10/usr.sbin/rtadvd/config.c 301809 2016-06-10 18:21:05Z ngie $ */ 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 */ 71static char entbuf[10 + 3 + NI_MAXHOST + 1]; 72static char oentbuf[10 + 3 + NI_MAXHOST + 1]; 73static char abuf[DNAME_LABELENC_MAXLEN]; 74 75static time_t prefix_timo = (60 * 120); /* 2 hours. 76 * XXX: should be configurable. */ 77 78static struct rtadvd_timer *prefix_timeout(void *); 79static void makeentry(char *, size_t, int, const char *); 80static size_t dname_labelenc(char *, const char *); 81 82/* Encode domain name label encoding in RFC 1035 Section 3.1 */ 83static size_t 84dname_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 135int 136loadconfig_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 148int 149loadconfig_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 188int 189rm_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 203int 204rm_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 } else { 233 /* recreate an empty entry */ 234 update_persist_ifinfo(&ifilist, ifi->ifi_ifname); 235 syslog(LOG_DEBUG, "<%s>: ifname=%s is persistent.", 236 __func__, ifi->ifi_ifname); 237 } 238 239 /* clean up rai if any */ 240 switch (ifi->ifi_state) { 241 case IFI_STATE_CONFIGURED: 242 if (ifi->ifi_rainfo != NULL) { 243 error = rm_rainfo(ifi->ifi_rainfo); 244 if (error) 245 return (error); 246 ifi->ifi_rainfo = NULL; 247 } 248 break; 249 case IFI_STATE_TRANSITIVE: 250 if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) { 251 if (ifi->ifi_rainfo != NULL) { 252 error = rm_rainfo(ifi->ifi_rainfo); 253 if (error) 254 return (error); 255 ifi->ifi_rainfo = NULL; 256 ifi->ifi_rainfo_trans = NULL; 257 } 258 } else { 259 if (ifi->ifi_rainfo != NULL) { 260 error = rm_rainfo(ifi->ifi_rainfo); 261 if (error) 262 return (error); 263 ifi->ifi_rainfo = NULL; 264 } 265 if (ifi->ifi_rainfo_trans != NULL) { 266 error = rm_rainfo(ifi->ifi_rainfo_trans); 267 if (error) 268 return (error); 269 ifi->ifi_rainfo_trans = NULL; 270 } 271 } 272 } 273 274 syslog(LOG_DEBUG, "<%s> leave (%s).", __func__, ifi->ifi_ifname); 275 if (!ifi->ifi_persist) 276 free(ifi); 277 return (0); 278} 279 280int 281rm_rainfo(struct rainfo *rai) 282{ 283 struct prefix *pfx; 284 struct soliciter *sol; 285 struct rdnss *rdn; 286 struct rdnss_addr *rdna; 287 struct dnssl *dns; 288 struct rtinfo *rti; 289 290 syslog(LOG_DEBUG, "<%s>: enter", __func__); 291 292 TAILQ_REMOVE(&railist, rai, rai_next); 293 if (rai->rai_ifinfo != NULL) 294 syslog(LOG_DEBUG, "<%s>: rainfo (idx=%d) removed.", 295 __func__, rai->rai_ifinfo->ifi_ifindex); 296 297 if (rai->rai_ra_data != NULL) 298 free(rai->rai_ra_data); 299 300 while ((pfx = TAILQ_FIRST(&rai->rai_prefix)) != NULL) 301 delete_prefix(pfx); 302 while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) { 303 TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next); 304 free(sol); 305 } 306 while ((rdn = TAILQ_FIRST(&rai->rai_rdnss)) != NULL) { 307 TAILQ_REMOVE(&rai->rai_rdnss, rdn, rd_next); 308 while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) { 309 TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next); 310 free(rdna); 311 } 312 free(rdn); 313 } 314 while ((dns = TAILQ_FIRST(&rai->rai_dnssl)) != NULL) { 315 TAILQ_REMOVE(&rai->rai_dnssl, dns, dn_next); 316 free(dns); 317 } 318 while ((rti = TAILQ_FIRST(&rai->rai_route)) != NULL) { 319 TAILQ_REMOVE(&rai->rai_route, rti, rti_next); 320 free(rti); 321 } 322 free(rai); 323 syslog(LOG_DEBUG, "<%s>: leave", __func__); 324 325 return (0); 326} 327 328struct ifinfo * 329getconfig(struct ifinfo *ifi) 330{ 331 int stat, i; 332 int error; 333 char tbuf[BUFSIZ]; 334 struct rainfo *rai; 335 struct rainfo *rai_old; 336 int32_t val; 337 int64_t val64; 338 char buf[BUFSIZ]; 339 char *bp = buf; 340 char *addr, *flagstr; 341 342 if (ifi == NULL) /* if does not exist */ 343 return (NULL); 344 345 if (ifi->ifi_state == IFI_STATE_TRANSITIVE && 346 ifi->ifi_rainfo == NULL) { 347 syslog(LOG_INFO, "<%s> %s is shutting down. Skipped.", 348 __func__, ifi->ifi_ifname); 349 return (NULL); 350 } 351 352 if ((stat = agetent(tbuf, ifi->ifi_ifname)) <= 0) { 353 memset(tbuf, 0, sizeof(tbuf)); 354 syslog(LOG_INFO, 355 "<%s> %s isn't defined in the configuration file" 356 " or the configuration file doesn't exist." 357 " Treat it as default", 358 __func__, ifi->ifi_ifname); 359 } 360 361 ELM_MALLOC(rai, exit(1)); 362 TAILQ_INIT(&rai->rai_prefix); 363 TAILQ_INIT(&rai->rai_route); 364 TAILQ_INIT(&rai->rai_rdnss); 365 TAILQ_INIT(&rai->rai_dnssl); 366 TAILQ_INIT(&rai->rai_soliciter); 367 rai->rai_ifinfo = ifi; 368 369 /* gather on-link prefixes from the network interfaces. */ 370 if (agetflag("noifprefix")) 371 rai->rai_advifprefix = 0; 372 else 373 rai->rai_advifprefix = 1; 374 375 /* get interface information */ 376 if (agetflag("nolladdr")) 377 rai->rai_advlinkopt = 0; 378 else 379 rai->rai_advlinkopt = 1; 380 if (rai->rai_advlinkopt) { 381 if (ifi->ifi_sdl.sdl_type == 0) { 382 syslog(LOG_ERR, 383 "<%s> can't get information of %s", 384 __func__, ifi->ifi_ifname); 385 goto getconfig_free_rai; 386 } 387 } 388 389 /* 390 * set router configuration variables. 391 */ 392 MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL); 393 if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) { 394 syslog(LOG_ERR, 395 "<%s> maxinterval (%" PRIu32 ") on %s is invalid " 396 "(must be between %u and %u)", __func__, val, 397 ifi->ifi_ifname, MIN_MAXINTERVAL, MAX_MAXINTERVAL); 398 goto getconfig_free_rai; 399 } 400 rai->rai_maxinterval = (uint16_t)val; 401 402 MAYHAVE(val, "mininterval", rai->rai_maxinterval/3); 403 if ((uint16_t)val < MIN_MININTERVAL || 404 (uint16_t)val > (rai->rai_maxinterval * 3) / 4) { 405 syslog(LOG_ERR, 406 "<%s> mininterval (%" PRIu32 ") on %s is invalid " 407 "(must be between %d and %d)", 408 __func__, val, ifi->ifi_ifname, MIN_MININTERVAL, 409 (rai->rai_maxinterval * 3) / 4); 410 goto getconfig_free_rai; 411 } 412 rai->rai_mininterval = (uint16_t)val; 413 414 MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT); 415 rai->rai_hoplimit = val & 0xff; 416 417 if ((flagstr = (char *)agetstr("raflags", &bp))) { 418 val = 0; 419 if (strchr(flagstr, 'm')) 420 val |= ND_RA_FLAG_MANAGED; 421 if (strchr(flagstr, 'o')) 422 val |= ND_RA_FLAG_OTHER; 423 if (strchr(flagstr, 'h')) 424 val |= ND_RA_FLAG_RTPREF_HIGH; 425 if (strchr(flagstr, 'l')) { 426 if ((val & ND_RA_FLAG_RTPREF_HIGH)) { 427 syslog(LOG_ERR, "<%s> the \'h\' and \'l\'" 428 " router flags are exclusive", __func__); 429 goto getconfig_free_rai; 430 } 431 val |= ND_RA_FLAG_RTPREF_LOW; 432 } 433 } else 434 MAYHAVE(val, "raflags", 0); 435 436 rai->rai_managedflg = val & ND_RA_FLAG_MANAGED; 437 rai->rai_otherflg = val & ND_RA_FLAG_OTHER; 438#ifndef ND_RA_FLAG_RTPREF_MASK 439#define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */ 440#define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */ 441#endif 442 rai->rai_rtpref = val & ND_RA_FLAG_RTPREF_MASK; 443 if (rai->rai_rtpref == ND_RA_FLAG_RTPREF_RSV) { 444 syslog(LOG_ERR, "<%s> invalid router preference (%02x) on %s", 445 __func__, rai->rai_rtpref, ifi->ifi_ifname); 446 goto getconfig_free_rai; 447 } 448 449 MAYHAVE(val, "rltime", rai->rai_maxinterval * 3); 450 if ((uint16_t)val && ((uint16_t)val < rai->rai_maxinterval || 451 (uint16_t)val > MAXROUTERLIFETIME)) { 452 syslog(LOG_ERR, 453 "<%s> router lifetime (%" PRIu32 ") on %s is invalid " 454 "(must be 0 or between %d and %d)", 455 __func__, val, ifi->ifi_ifname, rai->rai_maxinterval, 456 MAXROUTERLIFETIME); 457 goto getconfig_free_rai; 458 } 459 rai->rai_lifetime = val & 0xffff; 460 461 MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME); 462 if (val < 0 || val > MAXREACHABLETIME) { 463 syslog(LOG_ERR, 464 "<%s> reachable time (%" PRIu32 ") on %s is invalid " 465 "(must be no greater than %d)", 466 __func__, val, ifi->ifi_ifname, MAXREACHABLETIME); 467 goto getconfig_free_rai; 468 } 469 rai->rai_reachabletime = (uint32_t)val; 470 471 MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER); 472 if (val64 < 0 || val64 > 0xffffffff) { 473 syslog(LOG_ERR, "<%s> retrans time (%" PRIu64 ") on %s out of range", 474 __func__, val64, ifi->ifi_ifname); 475 goto getconfig_free_rai; 476 } 477 rai->rai_retranstimer = (uint32_t)val64; 478 479 if (agetnum("hapref") != -1 || agetnum("hatime") != -1) { 480 syslog(LOG_ERR, 481 "<%s> mobile-ip6 configuration not supported", 482 __func__); 483 goto getconfig_free_rai; 484 } 485 /* prefix information */ 486 487 /* 488 * This is an implementation specific parameter to consider 489 * link propagation delays and poorly synchronized clocks when 490 * checking consistency of advertised lifetimes. 491 */ 492 MAYHAVE(val, "clockskew", 0); 493 rai->rai_clockskew = val; 494 495 rai->rai_pfxs = 0; 496 for (i = -1; i < MAXPREFIX; i++) { 497 struct prefix *pfx; 498 499 makeentry(entbuf, sizeof(entbuf), i, "addr"); 500 addr = (char *)agetstr(entbuf, &bp); 501 if (addr == NULL) 502 continue; 503 504 /* allocate memory to store prefix information */ 505 ELM_MALLOC(pfx, exit(1)); 506 pfx->pfx_rainfo = rai; 507 pfx->pfx_origin = PREFIX_FROM_CONFIG; 508 509 if (inet_pton(AF_INET6, addr, &pfx->pfx_prefix) != 1) { 510 syslog(LOG_ERR, 511 "<%s> inet_pton failed for %s", 512 __func__, addr); 513 goto getconfig_free_pfx; 514 } 515 if (IN6_IS_ADDR_MULTICAST(&pfx->pfx_prefix)) { 516 syslog(LOG_ERR, 517 "<%s> multicast prefix (%s) must " 518 "not be advertised on %s", 519 __func__, addr, ifi->ifi_ifname); 520 goto getconfig_free_pfx; 521 } 522 if (IN6_IS_ADDR_LINKLOCAL(&pfx->pfx_prefix)) 523 syslog(LOG_NOTICE, 524 "<%s> link-local prefix (%s) will be" 525 " advertised on %s", 526 __func__, addr, ifi->ifi_ifname); 527 528 makeentry(entbuf, sizeof(entbuf), i, "prefixlen"); 529 MAYHAVE(val, entbuf, 64); 530 if (val < 0 || val > 128) { 531 syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s " 532 "on %s out of range", 533 __func__, val, addr, ifi->ifi_ifname); 534 goto getconfig_free_pfx; 535 } 536 pfx->pfx_prefixlen = (int)val; 537 538 makeentry(entbuf, sizeof(entbuf), i, "pinfoflags"); 539 if ((flagstr = (char *)agetstr(entbuf, &bp))) { 540 val = 0; 541 if (strchr(flagstr, 'l')) 542 val |= ND_OPT_PI_FLAG_ONLINK; 543 if (strchr(flagstr, 'a')) 544 val |= ND_OPT_PI_FLAG_AUTO; 545 } else { 546 MAYHAVE(val, entbuf, 547 (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO)); 548 } 549 pfx->pfx_onlinkflg = val & ND_OPT_PI_FLAG_ONLINK; 550 pfx->pfx_autoconfflg = val & ND_OPT_PI_FLAG_AUTO; 551 552 makeentry(entbuf, sizeof(entbuf), i, "vltime"); 553 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME); 554 if (val64 < 0 || val64 > 0xffffffff) { 555 syslog(LOG_ERR, "<%s> vltime (%" PRIu64 ") for " 556 "%s/%d on %s is out of range", 557 __func__, val64, 558 addr, pfx->pfx_prefixlen, ifi->ifi_ifname); 559 goto getconfig_free_pfx; 560 } 561 pfx->pfx_validlifetime = (uint32_t)val64; 562 563 makeentry(entbuf, sizeof(entbuf), i, "vltimedecr"); 564 if (agetflag(entbuf)) { 565 struct timespec now; 566 567 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 568 pfx->pfx_vltimeexpire = 569 now.tv_sec + pfx->pfx_validlifetime; 570 } 571 572 makeentry(entbuf, sizeof(entbuf), i, "pltime"); 573 MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME); 574 if (val64 < 0 || val64 > 0xffffffff) { 575 syslog(LOG_ERR, 576 "<%s> pltime (%" PRIu64 ") for %s/%d on %s " 577 "is out of range", 578 __func__, val64, 579 addr, pfx->pfx_prefixlen, ifi->ifi_ifname); 580 goto getconfig_free_pfx; 581 } 582 pfx->pfx_preflifetime = (uint32_t)val64; 583 584 makeentry(entbuf, sizeof(entbuf), i, "pltimedecr"); 585 if (agetflag(entbuf)) { 586 struct timespec now; 587 588 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 589 pfx->pfx_pltimeexpire = 590 now.tv_sec + pfx->pfx_preflifetime; 591 } 592 /* link into chain */ 593 TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); 594 rai->rai_pfxs++; 595 continue; 596getconfig_free_pfx: 597 free(pfx); 598 } 599 if (rai->rai_advifprefix && rai->rai_pfxs == 0) 600 get_prefix(rai); 601 602 MAYHAVE(val64, "mtu", 0); 603 if (val < 0 || val64 > 0xffffffff) { 604 syslog(LOG_ERR, 605 "<%s> mtu (%" PRIu64 ") on %s out of range", 606 __func__, val64, ifi->ifi_ifname); 607 goto getconfig_free_rai; 608 } 609 rai->rai_linkmtu = (uint32_t)val64; 610 if (rai->rai_linkmtu == 0) { 611 char *mtustr; 612 613 if ((mtustr = (char *)agetstr("mtu", &bp)) && 614 strcmp(mtustr, "auto") == 0) 615 rai->rai_linkmtu = ifi->ifi_phymtu; 616 } 617 else if (rai->rai_linkmtu < IPV6_MMTU || 618 rai->rai_linkmtu > ifi->ifi_phymtu) { 619 syslog(LOG_ERR, 620 "<%s> advertised link mtu (%" PRIu32 ") on %s is invalid (must " 621 "be between least MTU (%d) and physical link MTU (%d)", 622 __func__, rai->rai_linkmtu, ifi->ifi_ifname, 623 IPV6_MMTU, ifi->ifi_phymtu); 624 goto getconfig_free_rai; 625 } 626 627#ifdef SIOCSIFINFO_IN6 628 { 629 struct in6_ndireq ndi; 630 int s; 631 632 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 633 syslog(LOG_ERR, "<%s> socket: %s", __func__, 634 strerror(errno)); 635 exit(1); 636 } 637 memset(&ndi, 0, sizeof(ndi)); 638 strlcpy(ndi.ifname, ifi->ifi_ifname, sizeof(ndi.ifname)); 639 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&ndi) < 0) 640 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFINFO_IN6 at %s: %s", 641 __func__, ifi->ifi_ifname, strerror(errno)); 642 643 /* reflect the RA info to the host variables in kernel */ 644 ndi.ndi.chlim = rai->rai_hoplimit; 645 ndi.ndi.retrans = rai->rai_retranstimer; 646 ndi.ndi.basereachable = rai->rai_reachabletime; 647 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&ndi) < 0) 648 syslog(LOG_INFO, "<%s> ioctl:SIOCSIFINFO_IN6 at %s: %s", 649 __func__, ifi->ifi_ifname, strerror(errno)); 650 651 close(s); 652 } 653#endif 654 655 /* route information */ 656 rai->rai_routes = 0; 657 for (i = -1; i < MAXROUTE; i++) { 658 struct rtinfo *rti; 659 660 makeentry(entbuf, sizeof(entbuf), i, "rtprefix"); 661 addr = (char *)agetstr(entbuf, &bp); 662 if (addr == NULL) { 663 makeentry(oentbuf, sizeof(oentbuf), i, "rtrprefix"); 664 addr = (char *)agetstr(oentbuf, &bp); 665 if (addr) 666 fprintf(stderr, "%s was obsoleted. Use %s.\n", 667 oentbuf, entbuf); 668 } 669 if (addr == NULL) 670 continue; 671 672 /* allocate memory to store prefix information */ 673 ELM_MALLOC(rti, exit(1)); 674 675 if (inet_pton(AF_INET6, addr, &rti->rti_prefix) != 1) { 676 syslog(LOG_ERR, "<%s> inet_pton failed for %s", 677 __func__, addr); 678 goto getconfig_free_rti; 679 } 680#if 0 681 /* 682 * XXX: currently there's no restriction in route information 683 * prefix according to 684 * draft-ietf-ipngwg-router-selection-00.txt. 685 * However, I think the similar restriction be necessary. 686 */ 687 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME); 688 if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) { 689 syslog(LOG_ERR, 690 "<%s> multicast route (%s) must " 691 "not be advertised on %s", 692 __func__, addr, ifi->ifi_ifname); 693 goto getconfig_free_rti; 694 } 695 if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) { 696 syslog(LOG_NOTICE, 697 "<%s> link-local route (%s) will " 698 "be advertised on %s", 699 __func__, addr, ifi->ifi_ifname); 700 goto getconfig_free_rti; 701 } 702#endif 703 704 makeentry(entbuf, sizeof(entbuf), i, "rtplen"); 705 /* XXX: 256 is a magic number for compatibility check. */ 706 MAYHAVE(val, entbuf, 256); 707 if (val == 256) { 708 makeentry(oentbuf, sizeof(oentbuf), i, "rtrplen"); 709 MAYHAVE(val, oentbuf, 256); 710 if (val != 256) 711 fprintf(stderr, "%s was obsoleted. Use %s.\n", 712 oentbuf, entbuf); 713 else 714 val = 64; 715 } 716 if (val < 0 || val > 128) { 717 syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s on %s " 718 "out of range", 719 __func__, val, addr, ifi->ifi_ifname); 720 goto getconfig_free_rti; 721 } 722 rti->rti_prefixlen = (int)val; 723 724 makeentry(entbuf, sizeof(entbuf), i, "rtflags"); 725 if ((flagstr = (char *)agetstr(entbuf, &bp))) { 726 val = 0; 727 if (strchr(flagstr, 'h')) 728 val |= ND_RA_FLAG_RTPREF_HIGH; 729 if (strchr(flagstr, 'l')) { 730 if ((val & ND_RA_FLAG_RTPREF_HIGH)) { 731 syslog(LOG_ERR, 732 "<%s> the \'h\' and \'l\' route" 733 " preferences are exclusive", 734 __func__); 735 goto getconfig_free_rti; 736 } 737 val |= ND_RA_FLAG_RTPREF_LOW; 738 } 739 } else 740 MAYHAVE(val, entbuf, 256); /* XXX */ 741 if (val == 256) { 742 makeentry(oentbuf, sizeof(oentbuf), i, "rtrflags"); 743 MAYHAVE(val, oentbuf, 256); 744 if (val != 256) { 745 fprintf(stderr, "%s was obsoleted. Use %s.\n", 746 oentbuf, entbuf); 747 } else 748 val = 0; 749 } 750 rti->rti_rtpref = val & ND_RA_FLAG_RTPREF_MASK; 751 if (rti->rti_rtpref == ND_RA_FLAG_RTPREF_RSV) { 752 syslog(LOG_ERR, "<%s> invalid route preference (%02x) " 753 "for %s/%d on %s", 754 __func__, rti->rti_rtpref, addr, 755 rti->rti_prefixlen, ifi->ifi_ifname); 756 goto getconfig_free_rti; 757 } 758 759 /* 760 * Since the spec does not a default value, we should make 761 * this entry mandatory. However, FreeBSD 4.4 has shipped 762 * with this field being optional, we use the router lifetime 763 * as an ad-hoc default value with a warning message. 764 */ 765 makeentry(entbuf, sizeof(entbuf), i, "rtltime"); 766 MAYHAVE(val64, entbuf, -1); 767 if (val64 == -1) { 768 makeentry(oentbuf, sizeof(oentbuf), i, "rtrltime"); 769 MAYHAVE(val64, oentbuf, -1); 770 if (val64 != -1) 771 fprintf(stderr, "%s was obsoleted. Use %s.\n", 772 oentbuf, entbuf); 773 else { 774 fprintf(stderr, "%s should be specified " 775 "for interface %s.\n", entbuf, 776 ifi->ifi_ifname); 777 val64 = rai->rai_lifetime; 778 } 779 } 780 if (val64 < 0 || val64 > 0xffffffff) { 781 syslog(LOG_ERR, "<%s> route lifetime (%" PRIu64 ") for " 782 "%s/%d on %s out of range", __func__, 783 val64, addr, rti->rti_prefixlen, 784 ifi->ifi_ifname); 785 goto getconfig_free_rti; 786 } 787 rti->rti_ltime = (uint32_t)val64; 788 789 /* link into chain */ 790 TAILQ_INSERT_TAIL(&rai->rai_route, rti, rti_next); 791 rai->rai_routes++; 792 continue; 793getconfig_free_rti: 794 free(rti); 795 } 796 797 /* DNS server and DNS search list information */ 798 for (i = -1; i < MAXRDNSSENT ; i++) { 799 struct rdnss *rdn; 800 struct rdnss_addr *rdna; 801 char *ap; 802 int c; 803 804 makeentry(entbuf, sizeof(entbuf), i, "rdnss"); 805 addr = (char *)agetstr(entbuf, &bp); 806 if (addr == NULL) 807 break; 808 ELM_MALLOC(rdn, exit(1)); 809 810 TAILQ_INIT(&rdn->rd_list); 811 812 for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) { 813 c = strcspn(ap, ","); 814 strncpy(abuf, ap, c); 815 abuf[c] = '\0'; 816 ELM_MALLOC(rdna, goto getconfig_free_rdn); 817 if (inet_pton(AF_INET6, abuf, &rdna->ra_dns) != 1) { 818 syslog(LOG_ERR, "<%s> inet_pton failed for %s", 819 __func__, abuf); 820 free(rdna); 821 goto getconfig_free_rdn; 822 } 823 TAILQ_INSERT_TAIL(&rdn->rd_list, rdna, ra_next); 824 } 825 826 makeentry(entbuf, sizeof(entbuf), i, "rdnssltime"); 827 MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2)); 828 if ((uint16_t)val < rai->rai_maxinterval || 829 (uint16_t)val > rai->rai_maxinterval * 2) { 830 syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid " 831 "(must be between %d and %d)", 832 entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval, 833 rai->rai_maxinterval * 2); 834 goto getconfig_free_rdn; 835 } 836 rdn->rd_ltime = val; 837 838 /* link into chain */ 839 TAILQ_INSERT_TAIL(&rai->rai_rdnss, rdn, rd_next); 840 continue; 841getconfig_free_rdn: 842 while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) { 843 TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next); 844 free(rdna); 845 } 846 free(rdn); 847 } 848 849 for (i = -1; i < MAXDNSSLENT ; i++) { 850 struct dnssl *dns; 851 struct dnssl_addr *dnsa; 852 char *ap; 853 int c; 854 855 makeentry(entbuf, sizeof(entbuf), i, "dnssl"); 856 addr = (char *)agetstr(entbuf, &bp); 857 if (addr == NULL) 858 break; 859 860 ELM_MALLOC(dns, exit(1)); 861 862 TAILQ_INIT(&dns->dn_list); 863 864 for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) { 865 c = strcspn(ap, ","); 866 strncpy(abuf, ap, c); 867 abuf[c] = '\0'; 868 ELM_MALLOC(dnsa, goto getconfig_free_dns); 869 dnsa->da_len = dname_labelenc(dnsa->da_dom, abuf); 870 syslog(LOG_DEBUG, "<%s>: dnsa->da_len = %d", __func__, 871 dnsa->da_len); 872 TAILQ_INSERT_TAIL(&dns->dn_list, dnsa, da_next); 873 } 874 875 makeentry(entbuf, sizeof(entbuf), i, "dnsslltime"); 876 MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2)); 877 if ((uint16_t)val < rai->rai_maxinterval || 878 (uint16_t)val > rai->rai_maxinterval * 2) { 879 syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid " 880 "(must be between %d and %d)", 881 entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval, 882 rai->rai_maxinterval * 2); 883 goto getconfig_free_dns; 884 } 885 dns->dn_ltime = val; 886 887 /* link into chain */ 888 TAILQ_INSERT_TAIL(&rai->rai_dnssl, dns, dn_next); 889 continue; 890getconfig_free_dns: 891 while ((dnsa = TAILQ_FIRST(&dns->dn_list)) != NULL) { 892 TAILQ_REMOVE(&dns->dn_list, dnsa, da_next); 893 free(dnsa); 894 } 895 free(dns); 896 } 897 /* construct the sending packet */ 898 make_packet(rai); 899 900 /* 901 * If an entry with the same ifindex exists, remove it first. 902 * Before the removal, RDNSS and DNSSL options with 903 * zero-lifetime will be sent. 904 */ 905 switch (ifi->ifi_state) { 906 case IFI_STATE_UNCONFIGURED: 907 /* UNCONFIGURED -> TRANSITIVE */ 908 909 error = sock_mc_join(&sock, ifi->ifi_ifindex); 910 if (error) 911 exit(1); 912 913 ifi->ifi_state = IFI_STATE_TRANSITIVE; 914 ifi->ifi_burstcount = MAX_INITIAL_RTR_ADVERTISEMENTS; 915 ifi->ifi_burstinterval = MAX_INITIAL_RTR_ADVERT_INTERVAL; 916 917 /* The same two rai mean initial burst */ 918 ifi->ifi_rainfo = rai; 919 ifi->ifi_rainfo_trans = rai; 920 TAILQ_INSERT_TAIL(&railist, rai, rai_next); 921 922 if (ifi->ifi_ra_timer == NULL) 923 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, 924 ra_timer_update, ifi, ifi); 925 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 926 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 927 ifi->ifi_ra_timer); 928 929 syslog(LOG_DEBUG, 930 "<%s> ifname=%s marked as TRANSITIVE (initial burst).", 931 __func__, ifi->ifi_ifname); 932 break; 933 case IFI_STATE_CONFIGURED: 934 /* CONFIGURED -> TRANSITIVE */ 935 rai_old = ifi->ifi_rainfo; 936 if (rai_old == NULL) { 937 syslog(LOG_ERR, 938 "<%s> ifi_rainfo is NULL" 939 " in IFI_STATE_CONFIGURED.", __func__); 940 ifi = NULL; 941 break; 942 } else { 943 struct rdnss *rdn; 944 struct dnssl *dns; 945 946 rai_old->rai_lifetime = 0; 947 TAILQ_FOREACH(rdn, &rai_old->rai_rdnss, rd_next) 948 rdn->rd_ltime = 0; 949 TAILQ_FOREACH(dns, &rai_old->rai_dnssl, dn_next) 950 dns->dn_ltime = 0; 951 952 ifi->ifi_rainfo_trans = rai_old; 953 ifi->ifi_state = IFI_STATE_TRANSITIVE; 954 ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS; 955 ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS; 956 957 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 958 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 959 ifi->ifi_ra_timer); 960 961 syslog(LOG_DEBUG, 962 "<%s> ifname=%s marked as TRANSITIVE" 963 " (transitional burst)", 964 __func__, ifi->ifi_ifname); 965 } 966 ifi->ifi_rainfo = rai; 967 TAILQ_INSERT_TAIL(&railist, rai, rai_next); 968 break; 969 case IFI_STATE_TRANSITIVE: 970 if (ifi->ifi_rainfo != NULL) { 971 if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) { 972 /* Reinitialize initial burst */ 973 rm_rainfo(ifi->ifi_rainfo); 974 ifi->ifi_rainfo = rai; 975 ifi->ifi_rainfo_trans = rai; 976 ifi->ifi_burstcount = 977 MAX_INITIAL_RTR_ADVERTISEMENTS; 978 ifi->ifi_burstinterval = 979 MAX_INITIAL_RTR_ADVERT_INTERVAL; 980 } else { 981 /* Replace ifi_rainfo with the new one */ 982 rm_rainfo(ifi->ifi_rainfo); 983 ifi->ifi_rainfo = rai; 984 } 985 TAILQ_INSERT_TAIL(&railist, rai, rai_next); 986 987 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 988 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 989 ifi->ifi_ra_timer); 990 } else { 991 /* XXX: NOTREACHED. Being shut down. */ 992 syslog(LOG_ERR, 993 "<%s> %s is shutting down. Skipped.", 994 __func__, ifi->ifi_ifname); 995 rm_rainfo(rai); 996 997 return (NULL); 998 } 999 break; 1000 } 1001 1002 return (ifi); 1003 1004getconfig_free_rai: 1005 free(rai); 1006 return (NULL); 1007} 1008 1009void 1010get_prefix(struct rainfo *rai) 1011{ 1012 struct ifaddrs *ifap, *ifa; 1013 struct prefix *pfx; 1014 struct in6_addr *a; 1015 struct ifinfo *ifi; 1016 char *p, *ep, *m, *lim; 1017 char ntopbuf[INET6_ADDRSTRLEN]; 1018 1019 if (getifaddrs(&ifap) < 0) { 1020 syslog(LOG_ERR, 1021 "<%s> can't get interface addresses", 1022 __func__); 1023 exit(1); 1024 } 1025 ifi = rai->rai_ifinfo; 1026 1027 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1028 int plen; 1029 1030 if (strcmp(ifa->ifa_name, ifi->ifi_ifname) != 0) 1031 continue; 1032 if (ifa->ifa_addr->sa_family != AF_INET6) 1033 continue; 1034 a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 1035 if (IN6_IS_ADDR_LINKLOCAL(a)) 1036 continue; 1037 1038 /* get prefix length */ 1039 m = (char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 1040 lim = (char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len; 1041 plen = prefixlen(m, lim); 1042 if (plen <= 0 || plen > 128) { 1043 syslog(LOG_ERR, "<%s> failed to get prefixlen " 1044 "or prefix is invalid", 1045 __func__); 1046 exit(1); 1047 } 1048 if (plen == 128) /* XXX */ 1049 continue; 1050 if (find_prefix(rai, a, plen)) { 1051 /* ignore a duplicated prefix. */ 1052 continue; 1053 } 1054 1055 /* allocate memory to store prefix info. */ 1056 ELM_MALLOC(pfx, exit(1)); 1057 1058 /* set prefix, sweep bits outside of prefixlen */ 1059 pfx->pfx_prefixlen = plen; 1060 memcpy(&pfx->pfx_prefix, a, sizeof(*a)); 1061 p = (char *)&pfx->pfx_prefix; 1062 ep = (char *)(&pfx->pfx_prefix + 1); 1063 while (m < lim && p < ep) 1064 *p++ &= *m++; 1065 while (p < ep) 1066 *p++ = 0x00; 1067 if (!inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, 1068 sizeof(ntopbuf))) { 1069 syslog(LOG_ERR, "<%s> inet_ntop failed", __func__); 1070 exit(1); 1071 } 1072 syslog(LOG_DEBUG, 1073 "<%s> add %s/%d to prefix list on %s", 1074 __func__, ntopbuf, pfx->pfx_prefixlen, ifi->ifi_ifname); 1075 1076 /* set other fields with protocol defaults */ 1077 pfx->pfx_validlifetime = DEF_ADVVALIDLIFETIME; 1078 pfx->pfx_preflifetime = DEF_ADVPREFERREDLIFETIME; 1079 pfx->pfx_onlinkflg = 1; 1080 pfx->pfx_autoconfflg = 1; 1081 pfx->pfx_origin = PREFIX_FROM_KERNEL; 1082 pfx->pfx_rainfo = rai; 1083 1084 /* link into chain */ 1085 TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); 1086 1087 /* counter increment */ 1088 rai->rai_pfxs++; 1089 } 1090 1091 freeifaddrs(ifap); 1092} 1093 1094static void 1095makeentry(char *buf, size_t len, int id, const char *string) 1096{ 1097 1098 if (id < 0) 1099 strlcpy(buf, string, len); 1100 else 1101 snprintf(buf, len, "%s%d", string, id); 1102} 1103 1104/* 1105 * Add a prefix to the list of specified interface and reconstruct 1106 * the outgoing packet. 1107 * The prefix must not be in the list. 1108 * XXX: other parameters of the prefix (e.g. lifetime) should be 1109 * able to be specified. 1110 */ 1111static void 1112add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr) 1113{ 1114 struct prefix *pfx; 1115 struct ifinfo *ifi; 1116 char ntopbuf[INET6_ADDRSTRLEN]; 1117 1118 ifi = rai->rai_ifinfo; 1119 ELM_MALLOC(pfx, return); 1120 pfx->pfx_prefix = ipr->ipr_prefix.sin6_addr; 1121 pfx->pfx_prefixlen = ipr->ipr_plen; 1122 pfx->pfx_validlifetime = ipr->ipr_vltime; 1123 pfx->pfx_preflifetime = ipr->ipr_pltime; 1124 pfx->pfx_onlinkflg = ipr->ipr_raf_onlink; 1125 pfx->pfx_autoconfflg = ipr->ipr_raf_auto; 1126 pfx->pfx_origin = PREFIX_FROM_DYNAMIC; 1127 pfx->pfx_rainfo = rai; 1128 1129 TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); 1130 1131 syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s", 1132 __func__, 1133 inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, 1134 sizeof(ntopbuf)), ipr->ipr_plen, ifi->ifi_ifname); 1135 1136 rai->rai_pfxs++; 1137} 1138 1139/* 1140 * Delete a prefix to the list of specified interface and reconstruct 1141 * the outgoing packet. 1142 * The prefix must be in the list. 1143 */ 1144void 1145delete_prefix(struct prefix *pfx) 1146{ 1147 struct rainfo *rai; 1148 struct ifinfo *ifi; 1149 char ntopbuf[INET6_ADDRSTRLEN]; 1150 1151 rai = pfx->pfx_rainfo; 1152 ifi = rai->rai_ifinfo; 1153 TAILQ_REMOVE(&rai->rai_prefix, pfx, pfx_next); 1154 syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s", 1155 __func__, 1156 inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, 1157 sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname); 1158 if (pfx->pfx_timer) 1159 rtadvd_remove_timer(pfx->pfx_timer); 1160 free(pfx); 1161 1162 rai->rai_pfxs--; 1163} 1164 1165void 1166invalidate_prefix(struct prefix *pfx) 1167{ 1168 struct timespec timo; 1169 struct rainfo *rai; 1170 struct ifinfo *ifi; 1171 char ntopbuf[INET6_ADDRSTRLEN]; 1172 1173 rai = pfx->pfx_rainfo; 1174 ifi = rai->rai_ifinfo; 1175 if (pfx->pfx_timer) { /* sanity check */ 1176 syslog(LOG_ERR, 1177 "<%s> assumption failure: timer already exists", 1178 __func__); 1179 exit(1); 1180 } 1181 1182 syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, " 1183 "will expire in %ld seconds", __func__, 1184 inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, sizeof(ntopbuf)), 1185 pfx->pfx_prefixlen, ifi->ifi_ifname, (long)prefix_timo); 1186 1187 /* set the expiration timer */ 1188 pfx->pfx_timer = rtadvd_add_timer(prefix_timeout, NULL, pfx, NULL); 1189 if (pfx->pfx_timer == NULL) { 1190 syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. " 1191 "remove the prefix", __func__); 1192 delete_prefix(pfx); 1193 } 1194 timo.tv_sec = prefix_timo; 1195 timo.tv_nsec = 0; 1196 rtadvd_set_timer(&timo, pfx->pfx_timer); 1197} 1198 1199static struct rtadvd_timer * 1200prefix_timeout(void *arg) 1201{ 1202 1203 delete_prefix((struct prefix *)arg); 1204 1205 return (NULL); 1206} 1207 1208void 1209update_prefix(struct prefix *pfx) 1210{ 1211 struct rainfo *rai; 1212 struct ifinfo *ifi; 1213 char ntopbuf[INET6_ADDRSTRLEN]; 1214 1215 rai = pfx->pfx_rainfo; 1216 ifi = rai->rai_ifinfo; 1217 if (pfx->pfx_timer == NULL) { /* sanity check */ 1218 syslog(LOG_ERR, 1219 "<%s> assumption failure: timer does not exist", 1220 __func__); 1221 exit(1); 1222 } 1223 1224 syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s", 1225 __func__, inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, 1226 sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname); 1227 1228 /* stop the expiration timer */ 1229 rtadvd_remove_timer(pfx->pfx_timer); 1230 pfx->pfx_timer = NULL; 1231} 1232 1233/* 1234 * Try to get an in6_prefixreq contents for a prefix which matches 1235 * ipr->ipr_prefix and ipr->ipr_plen and belongs to 1236 * the interface whose name is ipr->ipr_name[]. 1237 */ 1238static int 1239init_prefix(struct in6_prefixreq *ipr) 1240{ 1241#if 0 1242 int s; 1243 1244 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1245 syslog(LOG_ERR, "<%s> socket: %s", __func__, 1246 strerror(errno)); 1247 exit(1); 1248 } 1249 1250 if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) { 1251 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __func__, 1252 strerror(errno)); 1253 1254 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME; 1255 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME; 1256 ipr->ipr_raf_onlink = 1; 1257 ipr->ipr_raf_auto = 1; 1258 /* omit other field initialization */ 1259 } 1260 else if (ipr->ipr_origin < PR_ORIG_RR) { 1261 char ntopbuf[INET6_ADDRSTRLEN]; 1262 1263 syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is" 1264 "lower than PR_ORIG_RR(router renumbering)." 1265 "This should not happen if I am router", __func__, 1266 inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, 1267 sizeof(ntopbuf)), ipr->ipr_origin); 1268 close(s); 1269 return (1); 1270 } 1271 1272 close(s); 1273 return (0); 1274#else 1275 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME; 1276 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME; 1277 ipr->ipr_raf_onlink = 1; 1278 ipr->ipr_raf_auto = 1; 1279 return (0); 1280#endif 1281} 1282 1283void 1284make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen) 1285{ 1286 struct in6_prefixreq ipr; 1287 1288 memset(&ipr, 0, sizeof(ipr)); 1289 if (if_indextoname(ifindex, ipr.ipr_name) == NULL) { 1290 syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't " 1291 "exist. This should not happen! %s", __func__, 1292 ifindex, strerror(errno)); 1293 exit(1); 1294 } 1295 ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix); 1296 ipr.ipr_prefix.sin6_family = AF_INET6; 1297 ipr.ipr_prefix.sin6_addr = *addr; 1298 ipr.ipr_plen = plen; 1299 1300 if (init_prefix(&ipr)) 1301 return; /* init failed by some error */ 1302 add_prefix(rai, &ipr); 1303} 1304 1305void 1306make_packet(struct rainfo *rai) 1307{ 1308 size_t packlen, lladdroptlen = 0; 1309 char *buf; 1310 struct nd_router_advert *ra; 1311 struct nd_opt_prefix_info *ndopt_pi; 1312 struct nd_opt_mtu *ndopt_mtu; 1313 struct nd_opt_route_info *ndopt_rti; 1314 struct rtinfo *rti; 1315 struct nd_opt_rdnss *ndopt_rdnss; 1316 struct rdnss *rdn; 1317 struct nd_opt_dnssl *ndopt_dnssl; 1318 struct dnssl *dns; 1319 size_t len; 1320 struct prefix *pfx; 1321 struct ifinfo *ifi; 1322 1323 ifi = rai->rai_ifinfo; 1324 /* calculate total length */ 1325 packlen = sizeof(struct nd_router_advert); 1326 if (rai->rai_advlinkopt) { 1327 if ((lladdroptlen = lladdropt_length(&ifi->ifi_sdl)) == 0) { 1328 syslog(LOG_INFO, 1329 "<%s> link-layer address option has" 1330 " null length on %s. Treat as not included.", 1331 __func__, ifi->ifi_ifname); 1332 rai->rai_advlinkopt = 0; 1333 } 1334 packlen += lladdroptlen; 1335 } 1336 if (rai->rai_pfxs) 1337 packlen += sizeof(struct nd_opt_prefix_info) * rai->rai_pfxs; 1338 if (rai->rai_linkmtu) 1339 packlen += sizeof(struct nd_opt_mtu); 1340 1341 TAILQ_FOREACH(rti, &rai->rai_route, rti_next) 1342 packlen += sizeof(struct nd_opt_route_info) + 1343 ((rti->rti_prefixlen + 0x3f) >> 6) * 8; 1344 1345 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) { 1346 struct rdnss_addr *rdna; 1347 1348 packlen += sizeof(struct nd_opt_rdnss); 1349 TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next) 1350 packlen += sizeof(rdna->ra_dns); 1351 } 1352 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) { 1353 struct dnssl_addr *dnsa; 1354 1355 packlen += sizeof(struct nd_opt_dnssl); 1356 len = 0; 1357 TAILQ_FOREACH(dnsa, &dns->dn_list, da_next) 1358 len += dnsa->da_len; 1359 1360 /* A zero octet and 8 octet boundary */ 1361 len++; 1362 len += (len % 8) ? 8 - len % 8 : 0; 1363 1364 packlen += len; 1365 } 1366 /* allocate memory for the packet */ 1367 if ((buf = malloc(packlen)) == NULL) { 1368 syslog(LOG_ERR, 1369 "<%s> can't get enough memory for an RA packet", 1370 __func__); 1371 exit(1); 1372 } 1373 memset(buf, 0, packlen); 1374 if (rai->rai_ra_data) /* Free old data if any. */ 1375 free(rai->rai_ra_data); 1376 rai->rai_ra_data = buf; 1377 /* XXX: what if packlen > 576? */ 1378 rai->rai_ra_datalen = packlen; 1379 1380 /* 1381 * construct the packet 1382 */ 1383 ra = (struct nd_router_advert *)buf; 1384 ra->nd_ra_type = ND_ROUTER_ADVERT; 1385 ra->nd_ra_code = 0; 1386 ra->nd_ra_cksum = 0; 1387 ra->nd_ra_curhoplimit = (uint8_t)(0xff & rai->rai_hoplimit); 1388 ra->nd_ra_flags_reserved = 0; /* just in case */ 1389 /* 1390 * XXX: the router preference field, which is a 2-bit field, should be 1391 * initialized before other fields. 1392 */ 1393 ra->nd_ra_flags_reserved = 0xff & rai->rai_rtpref; 1394 ra->nd_ra_flags_reserved |= 1395 rai->rai_managedflg ? ND_RA_FLAG_MANAGED : 0; 1396 ra->nd_ra_flags_reserved |= 1397 rai->rai_otherflg ? ND_RA_FLAG_OTHER : 0; 1398 ra->nd_ra_router_lifetime = htons(rai->rai_lifetime); 1399 ra->nd_ra_reachable = htonl(rai->rai_reachabletime); 1400 ra->nd_ra_retransmit = htonl(rai->rai_retranstimer); 1401 buf += sizeof(*ra); 1402 1403 if (rai->rai_advlinkopt) { 1404 lladdropt_fill(&ifi->ifi_sdl, (struct nd_opt_hdr *)buf); 1405 buf += lladdroptlen; 1406 } 1407 1408 if (rai->rai_linkmtu) { 1409 ndopt_mtu = (struct nd_opt_mtu *)buf; 1410 ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU; 1411 ndopt_mtu->nd_opt_mtu_len = 1; 1412 ndopt_mtu->nd_opt_mtu_reserved = 0; 1413 ndopt_mtu->nd_opt_mtu_mtu = htonl(rai->rai_linkmtu); 1414 buf += sizeof(struct nd_opt_mtu); 1415 } 1416 1417 TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) { 1418 uint32_t vltime, pltime; 1419 struct timespec now; 1420 1421 ndopt_pi = (struct nd_opt_prefix_info *)buf; 1422 ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION; 1423 ndopt_pi->nd_opt_pi_len = 4; 1424 ndopt_pi->nd_opt_pi_prefix_len = pfx->pfx_prefixlen; 1425 ndopt_pi->nd_opt_pi_flags_reserved = 0; 1426 if (pfx->pfx_onlinkflg) 1427 ndopt_pi->nd_opt_pi_flags_reserved |= 1428 ND_OPT_PI_FLAG_ONLINK; 1429 if (pfx->pfx_autoconfflg) 1430 ndopt_pi->nd_opt_pi_flags_reserved |= 1431 ND_OPT_PI_FLAG_AUTO; 1432 if (pfx->pfx_timer) 1433 vltime = 0; 1434 else { 1435 if (pfx->pfx_vltimeexpire || pfx->pfx_pltimeexpire) 1436 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 1437 if (pfx->pfx_vltimeexpire == 0) 1438 vltime = pfx->pfx_validlifetime; 1439 else 1440 vltime = ((time_t)pfx->pfx_vltimeexpire > now.tv_sec) ? 1441 pfx->pfx_vltimeexpire - now.tv_sec : 0; 1442 } 1443 if (pfx->pfx_timer) 1444 pltime = 0; 1445 else { 1446 if (pfx->pfx_pltimeexpire == 0) 1447 pltime = pfx->pfx_preflifetime; 1448 else 1449 pltime = ((time_t)pfx->pfx_pltimeexpire > now.tv_sec) ? 1450 pfx->pfx_pltimeexpire - now.tv_sec : 0; 1451 } 1452 if (vltime < pltime) { 1453 /* 1454 * this can happen if vltime is decrement but pltime 1455 * is not. 1456 */ 1457 pltime = vltime; 1458 } 1459 ndopt_pi->nd_opt_pi_valid_time = htonl(vltime); 1460 ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime); 1461 ndopt_pi->nd_opt_pi_reserved2 = 0; 1462 ndopt_pi->nd_opt_pi_prefix = pfx->pfx_prefix; 1463 1464 buf += sizeof(struct nd_opt_prefix_info); 1465 } 1466 1467 TAILQ_FOREACH(rti, &rai->rai_route, rti_next) { 1468 uint8_t psize = (rti->rti_prefixlen + 0x3f) >> 6; 1469 1470 ndopt_rti = (struct nd_opt_route_info *)buf; 1471 ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO; 1472 ndopt_rti->nd_opt_rti_len = 1 + psize; 1473 ndopt_rti->nd_opt_rti_prefixlen = rti->rti_prefixlen; 1474 ndopt_rti->nd_opt_rti_flags = 0xff & rti->rti_rtpref; 1475 ndopt_rti->nd_opt_rti_lifetime = htonl(rti->rti_ltime); 1476 memcpy(ndopt_rti + 1, &rti->rti_prefix, psize * 8); 1477 buf += sizeof(struct nd_opt_route_info) + psize * 8; 1478 } 1479 1480 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) { 1481 struct rdnss_addr *rdna; 1482 1483 ndopt_rdnss = (struct nd_opt_rdnss *)buf; 1484 ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS; 1485 ndopt_rdnss->nd_opt_rdnss_len = 0; 1486 ndopt_rdnss->nd_opt_rdnss_reserved = 0; 1487 ndopt_rdnss->nd_opt_rdnss_lifetime = htonl(rdn->rd_ltime); 1488 buf += sizeof(struct nd_opt_rdnss); 1489 1490 TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next) { 1491 memcpy(buf, &rdna->ra_dns, sizeof(rdna->ra_dns)); 1492 buf += sizeof(rdna->ra_dns); 1493 } 1494 /* Length field should be in 8 octets */ 1495 ndopt_rdnss->nd_opt_rdnss_len = (buf - (char *)ndopt_rdnss) / 8; 1496 1497 syslog(LOG_DEBUG, "<%s>: nd_opt_dnss_len = %d", __func__, 1498 ndopt_rdnss->nd_opt_rdnss_len); 1499 } 1500 1501 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) { 1502 struct dnssl_addr *dnsa; 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 len += (len % 8) ? 8 - len % 8 : 0; 1522 1523 /* Length field must be in 8 octets */ 1524 ndopt_dnssl->nd_opt_dnssl_len = len / 8; 1525 1526 syslog(LOG_DEBUG, "<%s>: nd_opt_dnssl_len = %d", __func__, 1527 ndopt_dnssl->nd_opt_dnssl_len); 1528 } 1529 return; 1530} 1531