1/* $FreeBSD$ */ 2/* $KAME: config.c,v 1.84 2003/08/05 12:34:23 itojun Exp $ */ 3 4/* 5 * Copyright (C) 1998 WIDE Project. 6 * 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#include <sys/time.h> 38 39#include <net/if.h> 40#include <net/if_var.h> 41#include <net/route.h> 42#include <net/if_dl.h> 43 44#include <netinet/in.h> 45#include <netinet/in_var.h> 46#include <netinet/ip6.h> 47#include <netinet6/ip6_var.h> 48#include <netinet/icmp6.h> 49#include <netinet6/nd6.h> 50 51#include <arpa/inet.h> 52 53#include <stdio.h> 54#include <syslog.h> 55#include <errno.h> 56#include <inttypes.h> 57#include <netdb.h> 58#include <string.h> 59#include <search.h> 60#include <stdlib.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 becasue 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 279int 280rm_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 327struct ifinfo * 328getconfig(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 timeval now; 565 gettimeofday(&now, 0); 566 pfx->pfx_vltimeexpire = 567 now.tv_sec + pfx->pfx_validlifetime; 568 } 569 570 makeentry(entbuf, sizeof(entbuf), i, "pltime"); 571 MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME); 572 if (val64 < 0 || val64 > 0xffffffff) { 573 syslog(LOG_ERR, 574 "<%s> pltime (%" PRIu64 ") for %s/%d on %s " 575 "is out of range", 576 __func__, val64, 577 addr, pfx->pfx_prefixlen, ifi->ifi_ifname); 578 goto getconfig_free_pfx; 579 } 580 pfx->pfx_preflifetime = (uint32_t)val64; 581 582 makeentry(entbuf, sizeof(entbuf), i, "pltimedecr"); 583 if (agetflag(entbuf)) { 584 struct timeval now; 585 gettimeofday(&now, 0); 586 pfx->pfx_pltimeexpire = 587 now.tv_sec + pfx->pfx_preflifetime; 588 } 589 /* link into chain */ 590 TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); 591 rai->rai_pfxs++; 592 continue; 593getconfig_free_pfx: 594 free(pfx); 595 } 596 if (rai->rai_advifprefix && rai->rai_pfxs == 0) 597 get_prefix(rai); 598 599 MAYHAVE(val64, "mtu", 0); 600 if (val < 0 || val64 > 0xffffffff) { 601 syslog(LOG_ERR, 602 "<%s> mtu (%" PRIu64 ") on %s out of range", 603 __func__, val64, ifi->ifi_ifname); 604 goto getconfig_free_rai; 605 } 606 rai->rai_linkmtu = (uint32_t)val64; 607 if (rai->rai_linkmtu == 0) { 608 char *mtustr; 609 610 if ((mtustr = (char *)agetstr("mtu", &bp)) && 611 strcmp(mtustr, "auto") == 0) 612 rai->rai_linkmtu = ifi->ifi_phymtu; 613 } 614 else if (rai->rai_linkmtu < IPV6_MMTU || 615 rai->rai_linkmtu > ifi->ifi_phymtu) { 616 syslog(LOG_ERR, 617 "<%s> advertised link mtu (%" PRIu32 ") on %s is invalid (must " 618 "be between least MTU (%d) and physical link MTU (%d)", 619 __func__, rai->rai_linkmtu, ifi->ifi_ifname, 620 IPV6_MMTU, ifi->ifi_phymtu); 621 goto getconfig_free_rai; 622 } 623 624#ifdef SIOCSIFINFO_IN6 625 { 626 struct in6_ndireq ndi; 627 int s; 628 629 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 630 syslog(LOG_ERR, "<%s> socket: %s", __func__, 631 strerror(errno)); 632 exit(1); 633 } 634 memset(&ndi, 0, sizeof(ndi)); 635 strncpy(ndi.ifname, ifi->ifi_ifname, sizeof(ndi.ifname)); 636 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&ndi) < 0) 637 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFINFO_IN6 at %s: %s", 638 __func__, ifi->ifi_ifname, strerror(errno)); 639 640 /* reflect the RA info to the host variables in kernel */ 641 ndi.ndi.chlim = rai->rai_hoplimit; 642 ndi.ndi.retrans = rai->rai_retranstimer; 643 ndi.ndi.basereachable = rai->rai_reachabletime; 644 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&ndi) < 0) 645 syslog(LOG_INFO, "<%s> ioctl:SIOCSIFINFO_IN6 at %s: %s", 646 __func__, ifi->ifi_ifname, strerror(errno)); 647 648 close(s); 649 } 650#endif 651 652 /* route information */ 653 rai->rai_routes = 0; 654 for (i = -1; i < MAXROUTE; i++) { 655 struct rtinfo *rti; 656 657 makeentry(entbuf, sizeof(entbuf), i, "rtprefix"); 658 addr = (char *)agetstr(entbuf, &bp); 659 if (addr == NULL) { 660 makeentry(oentbuf, sizeof(oentbuf), i, "rtrprefix"); 661 addr = (char *)agetstr(oentbuf, &bp); 662 if (addr) 663 fprintf(stderr, "%s was obsoleted. Use %s.\n", 664 oentbuf, entbuf); 665 } 666 if (addr == NULL) 667 continue; 668 669 /* allocate memory to store prefix information */ 670 ELM_MALLOC(rti, exit(1)); 671 672 if (inet_pton(AF_INET6, addr, &rti->rti_prefix) != 1) { 673 syslog(LOG_ERR, "<%s> inet_pton failed for %s", 674 __func__, addr); 675 goto getconfig_free_rti; 676 } 677#if 0 678 /* 679 * XXX: currently there's no restriction in route information 680 * prefix according to 681 * draft-ietf-ipngwg-router-selection-00.txt. 682 * However, I think the similar restriction be necessary. 683 */ 684 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME); 685 if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) { 686 syslog(LOG_ERR, 687 "<%s> multicast route (%s) must " 688 "not be advertised on %s", 689 __func__, addr, ifi->ifi_ifname); 690 goto getconfig_free_rti; 691 } 692 if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) { 693 syslog(LOG_NOTICE, 694 "<%s> link-local route (%s) will " 695 "be advertised on %s", 696 __func__, addr, ifi->ifi_ifname); 697 goto getconfig_free_rti; 698 } 699#endif 700 701 makeentry(entbuf, sizeof(entbuf), i, "rtplen"); 702 /* XXX: 256 is a magic number for compatibility check. */ 703 MAYHAVE(val, entbuf, 256); 704 if (val == 256) { 705 makeentry(oentbuf, sizeof(oentbuf), i, "rtrplen"); 706 MAYHAVE(val, oentbuf, 256); 707 if (val != 256) 708 fprintf(stderr, "%s was obsoleted. Use %s.\n", 709 oentbuf, entbuf); 710 else 711 val = 64; 712 } 713 if (val < 0 || val > 128) { 714 syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s on %s " 715 "out of range", 716 __func__, val, addr, ifi->ifi_ifname); 717 goto getconfig_free_rti; 718 } 719 rti->rti_prefixlen = (int)val; 720 721 makeentry(entbuf, sizeof(entbuf), i, "rtflags"); 722 if ((flagstr = (char *)agetstr(entbuf, &bp))) { 723 val = 0; 724 if (strchr(flagstr, 'h')) 725 val |= ND_RA_FLAG_RTPREF_HIGH; 726 if (strchr(flagstr, 'l')) { 727 if ((val & ND_RA_FLAG_RTPREF_HIGH)) { 728 syslog(LOG_ERR, 729 "<%s> the \'h\' and \'l\' route" 730 " preferences are exclusive", 731 __func__); 732 goto getconfig_free_rti; 733 } 734 val |= ND_RA_FLAG_RTPREF_LOW; 735 } 736 } else 737 MAYHAVE(val, entbuf, 256); /* XXX */ 738 if (val == 256) { 739 makeentry(oentbuf, sizeof(oentbuf), i, "rtrflags"); 740 MAYHAVE(val, oentbuf, 256); 741 if (val != 256) { 742 fprintf(stderr, "%s was obsoleted. Use %s.\n", 743 oentbuf, entbuf); 744 } else 745 val = 0; 746 } 747 rti->rti_rtpref = val & ND_RA_FLAG_RTPREF_MASK; 748 if (rti->rti_rtpref == ND_RA_FLAG_RTPREF_RSV) { 749 syslog(LOG_ERR, "<%s> invalid route preference (%02x) " 750 "for %s/%d on %s", 751 __func__, rti->rti_rtpref, addr, 752 rti->rti_prefixlen, ifi->ifi_ifname); 753 goto getconfig_free_rti; 754 } 755 756 /* 757 * Since the spec does not a default value, we should make 758 * this entry mandatory. However, FreeBSD 4.4 has shipped 759 * with this field being optional, we use the router lifetime 760 * as an ad-hoc default value with a warning message. 761 */ 762 makeentry(entbuf, sizeof(entbuf), i, "rtltime"); 763 MAYHAVE(val64, entbuf, -1); 764 if (val64 == -1) { 765 makeentry(oentbuf, sizeof(oentbuf), i, "rtrltime"); 766 MAYHAVE(val64, oentbuf, -1); 767 if (val64 != -1) 768 fprintf(stderr, "%s was obsoleted. Use %s.\n", 769 oentbuf, entbuf); 770 else { 771 fprintf(stderr, "%s should be specified " 772 "for interface %s.\n", entbuf, 773 ifi->ifi_ifname); 774 val64 = rai->rai_lifetime; 775 } 776 } 777 if (val64 < 0 || val64 > 0xffffffff) { 778 syslog(LOG_ERR, "<%s> route lifetime (%" PRIu64 ") for " 779 "%s/%d on %s out of range", __func__, 780 val64, addr, rti->rti_prefixlen, 781 ifi->ifi_ifname); 782 goto getconfig_free_rti; 783 } 784 rti->rti_ltime = (uint32_t)val64; 785 786 /* link into chain */ 787 TAILQ_INSERT_TAIL(&rai->rai_route, rti, rti_next); 788 rai->rai_routes++; 789 continue; 790getconfig_free_rti: 791 free(rti); 792 } 793 794 /* DNS server and DNS search list information */ 795 for (i = -1; i < MAXRDNSSENT ; i++) { 796 struct rdnss *rdn; 797 struct rdnss_addr *rdna; 798 char *ap; 799 int c; 800 801 makeentry(entbuf, sizeof(entbuf), i, "rdnss"); 802 addr = (char *)agetstr(entbuf, &bp); 803 if (addr == NULL) 804 break; 805 ELM_MALLOC(rdn, exit(1)); 806 807 TAILQ_INIT(&rdn->rd_list); 808 809 for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) { 810 c = strcspn(ap, ","); 811 strncpy(abuf, ap, c); 812 abuf[c] = '\0'; 813 ELM_MALLOC(rdna, goto getconfig_free_rdn); 814 if (inet_pton(AF_INET6, abuf, &rdna->ra_dns) != 1) { 815 syslog(LOG_ERR, "<%s> inet_pton failed for %s", 816 __func__, abuf); 817 free(rdna); 818 goto getconfig_free_rdn; 819 } 820 TAILQ_INSERT_TAIL(&rdn->rd_list, rdna, ra_next); 821 } 822 823 makeentry(entbuf, sizeof(entbuf), i, "rdnssltime"); 824 MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2)); 825 if ((uint16_t)val < rai->rai_maxinterval || 826 (uint16_t)val > rai->rai_maxinterval * 2) { 827 syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid " 828 "(must be between %d and %d)", 829 entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval, 830 rai->rai_maxinterval * 2); 831 goto getconfig_free_rdn; 832 } 833 rdn->rd_ltime = val; 834 835 /* link into chain */ 836 TAILQ_INSERT_TAIL(&rai->rai_rdnss, rdn, rd_next); 837 continue; 838getconfig_free_rdn: 839 while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) { 840 TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next); 841 free(rdna); 842 } 843 free(rdn); 844 } 845 846 for (i = -1; i < MAXDNSSLENT ; i++) { 847 struct dnssl *dns; 848 struct dnssl_addr *dnsa; 849 char *ap; 850 int c; 851 852 makeentry(entbuf, sizeof(entbuf), i, "dnssl"); 853 addr = (char *)agetstr(entbuf, &bp); 854 if (addr == NULL) 855 break; 856 857 ELM_MALLOC(dns, exit(1)); 858 859 TAILQ_INIT(&dns->dn_list); 860 861 for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) { 862 c = strcspn(ap, ","); 863 strncpy(abuf, ap, c); 864 abuf[c] = '\0'; 865 ELM_MALLOC(dnsa, goto getconfig_free_dns); 866 dnsa->da_len = dname_labelenc(dnsa->da_dom, abuf); 867 syslog(LOG_DEBUG, "<%s>: dnsa->da_len = %d", __func__, 868 dnsa->da_len); 869 TAILQ_INSERT_TAIL(&dns->dn_list, dnsa, da_next); 870 } 871 872 makeentry(entbuf, sizeof(entbuf), i, "dnsslltime"); 873 MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2)); 874 if ((uint16_t)val < rai->rai_maxinterval || 875 (uint16_t)val > rai->rai_maxinterval * 2) { 876 syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid " 877 "(must be between %d and %d)", 878 entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval, 879 rai->rai_maxinterval * 2); 880 goto getconfig_free_dns; 881 } 882 dns->dn_ltime = val; 883 884 /* link into chain */ 885 TAILQ_INSERT_TAIL(&rai->rai_dnssl, dns, dn_next); 886 continue; 887getconfig_free_dns: 888 while ((dnsa = TAILQ_FIRST(&dns->dn_list)) != NULL) { 889 TAILQ_REMOVE(&dns->dn_list, dnsa, da_next); 890 free(dnsa); 891 } 892 free(dns); 893 } 894 /* construct the sending packet */ 895 make_packet(rai); 896 897 /* 898 * If an entry with the same ifindex exists, remove it first. 899 * Before the removal, RDNSS and DNSSL options with 900 * zero-lifetime will be sent. 901 */ 902 switch (ifi->ifi_state) { 903 case IFI_STATE_UNCONFIGURED: 904 /* UNCONFIGURED -> TRANSITIVE */ 905 906 error = sock_mc_join(&sock, ifi->ifi_ifindex); 907 if (error) 908 exit(1); 909 910 ifi->ifi_state = IFI_STATE_TRANSITIVE; 911 ifi->ifi_burstcount = MAX_INITIAL_RTR_ADVERTISEMENTS; 912 ifi->ifi_burstinterval = MAX_INITIAL_RTR_ADVERT_INTERVAL; 913 914 /* The same two rai mean initial burst */ 915 ifi->ifi_rainfo = rai; 916 ifi->ifi_rainfo_trans = rai; 917 TAILQ_INSERT_TAIL(&railist, rai, rai_next); 918 919 if (ifi->ifi_ra_timer == NULL) 920 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, 921 ra_timer_update, ifi, ifi); 922 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 923 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 924 ifi->ifi_ra_timer); 925 926 syslog(LOG_DEBUG, 927 "<%s> ifname=%s marked as TRANSITIVE (initial burst).", 928 __func__, ifi->ifi_ifname); 929 break; 930 case IFI_STATE_CONFIGURED: 931 /* CONFIGURED -> TRANSITIVE */ 932 rai_old = ifi->ifi_rainfo; 933 if (rai_old == NULL) { 934 syslog(LOG_ERR, 935 "<%s> ifi_rainfo is NULL" 936 " in IFI_STATE_CONFIGURED.", __func__); 937 ifi = NULL; 938 break; 939 } else { 940 struct rdnss *rdn; 941 struct dnssl *dns; 942 943 rai_old->rai_lifetime = 0; 944 TAILQ_FOREACH(rdn, &rai_old->rai_rdnss, rd_next) 945 rdn->rd_ltime = 0; 946 TAILQ_FOREACH(dns, &rai_old->rai_dnssl, dn_next) 947 dns->dn_ltime = 0; 948 949 ifi->ifi_rainfo_trans = rai_old; 950 ifi->ifi_state = IFI_STATE_TRANSITIVE; 951 ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS; 952 ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS; 953 954 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 955 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 956 ifi->ifi_ra_timer); 957 958 syslog(LOG_DEBUG, 959 "<%s> ifname=%s marked as TRANSITIVE" 960 " (transitional burst)", 961 __func__, ifi->ifi_ifname); 962 } 963 ifi->ifi_rainfo = rai; 964 TAILQ_INSERT_TAIL(&railist, rai, rai_next); 965 break; 966 case IFI_STATE_TRANSITIVE: 967 if (ifi->ifi_rainfo != NULL) { 968 if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) { 969 /* Reinitialize initial burst */ 970 rm_rainfo(ifi->ifi_rainfo); 971 ifi->ifi_rainfo = rai; 972 ifi->ifi_rainfo_trans = rai; 973 ifi->ifi_burstcount = 974 MAX_INITIAL_RTR_ADVERTISEMENTS; 975 ifi->ifi_burstinterval = 976 MAX_INITIAL_RTR_ADVERT_INTERVAL; 977 } else { 978 /* Replace ifi_rainfo with the new one */ 979 rm_rainfo(ifi->ifi_rainfo); 980 ifi->ifi_rainfo = rai; 981 } 982 TAILQ_INSERT_TAIL(&railist, rai, rai_next); 983 984 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 985 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 986 ifi->ifi_ra_timer); 987 } else { 988 /* XXX: NOTREACHED. Being shut down. */ 989 syslog(LOG_ERR, 990 "<%s> %s is shutting down. Skipped.", 991 __func__, ifi->ifi_ifname); 992 rm_rainfo(rai); 993 994 return (NULL); 995 } 996 break; 997 } 998 999 return (ifi); 1000 1001getconfig_free_rai: 1002 free(rai); 1003 return (NULL); 1004} 1005 1006void 1007get_prefix(struct rainfo *rai) 1008{ 1009 struct ifaddrs *ifap, *ifa; 1010 struct prefix *pfx; 1011 struct in6_addr *a; 1012 struct ifinfo *ifi; 1013 char *p, *ep, *m, *lim; 1014 char ntopbuf[INET6_ADDRSTRLEN]; 1015 1016 if (getifaddrs(&ifap) < 0) { 1017 syslog(LOG_ERR, 1018 "<%s> can't get interface addresses", 1019 __func__); 1020 exit(1); 1021 } 1022 ifi = rai->rai_ifinfo; 1023 1024 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 1025 int plen; 1026 1027 if (strcmp(ifa->ifa_name, ifi->ifi_ifname) != 0) 1028 continue; 1029 if (ifa->ifa_addr->sa_family != AF_INET6) 1030 continue; 1031 a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr; 1032 if (IN6_IS_ADDR_LINKLOCAL(a)) 1033 continue; 1034 1035 /* get prefix length */ 1036 m = (char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr; 1037 lim = (char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len; 1038 plen = prefixlen(m, lim); 1039 if (plen <= 0 || plen > 128) { 1040 syslog(LOG_ERR, "<%s> failed to get prefixlen " 1041 "or prefix is invalid", 1042 __func__); 1043 exit(1); 1044 } 1045 if (plen == 128) /* XXX */ 1046 continue; 1047 if (find_prefix(rai, a, plen)) { 1048 /* ignore a duplicated prefix. */ 1049 continue; 1050 } 1051 1052 /* allocate memory to store prefix info. */ 1053 ELM_MALLOC(pfx, exit(1)); 1054 1055 /* set prefix, sweep bits outside of prefixlen */ 1056 pfx->pfx_prefixlen = plen; 1057 memcpy(&pfx->pfx_prefix, a, sizeof(*a)); 1058 p = (char *)&pfx->pfx_prefix; 1059 ep = (char *)(&pfx->pfx_prefix + 1); 1060 while (m < lim && p < ep) 1061 *p++ &= *m++; 1062 while (p < ep) 1063 *p++ = 0x00; 1064 if (!inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, 1065 sizeof(ntopbuf))) { 1066 syslog(LOG_ERR, "<%s> inet_ntop failed", __func__); 1067 exit(1); 1068 } 1069 syslog(LOG_DEBUG, 1070 "<%s> add %s/%d to prefix list on %s", 1071 __func__, ntopbuf, pfx->pfx_prefixlen, ifi->ifi_ifname); 1072 1073 /* set other fields with protocol defaults */ 1074 pfx->pfx_validlifetime = DEF_ADVVALIDLIFETIME; 1075 pfx->pfx_preflifetime = DEF_ADVPREFERREDLIFETIME; 1076 pfx->pfx_onlinkflg = 1; 1077 pfx->pfx_autoconfflg = 1; 1078 pfx->pfx_origin = PREFIX_FROM_KERNEL; 1079 pfx->pfx_rainfo = rai; 1080 1081 /* link into chain */ 1082 TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); 1083 1084 /* counter increment */ 1085 rai->rai_pfxs++; 1086 } 1087 1088 freeifaddrs(ifap); 1089} 1090 1091static void 1092makeentry(char *buf, size_t len, int id, const char *string) 1093{ 1094 1095 if (id < 0) 1096 strlcpy(buf, string, len); 1097 else 1098 snprintf(buf, len, "%s%d", string, id); 1099} 1100 1101/* 1102 * Add a prefix to the list of specified interface and reconstruct 1103 * the outgoing packet. 1104 * The prefix must not be in the list. 1105 * XXX: other parameters of the prefix (e.g. lifetime) should be 1106 * able to be specified. 1107 */ 1108static void 1109add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr) 1110{ 1111 struct prefix *pfx; 1112 struct ifinfo *ifi; 1113 char ntopbuf[INET6_ADDRSTRLEN]; 1114 1115 ifi = rai->rai_ifinfo; 1116 ELM_MALLOC(pfx, return); 1117 pfx->pfx_prefix = ipr->ipr_prefix.sin6_addr; 1118 pfx->pfx_prefixlen = ipr->ipr_plen; 1119 pfx->pfx_validlifetime = ipr->ipr_vltime; 1120 pfx->pfx_preflifetime = ipr->ipr_pltime; 1121 pfx->pfx_onlinkflg = ipr->ipr_raf_onlink; 1122 pfx->pfx_autoconfflg = ipr->ipr_raf_auto; 1123 pfx->pfx_origin = PREFIX_FROM_DYNAMIC; 1124 pfx->pfx_rainfo = rai; 1125 1126 TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next); 1127 1128 syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s", 1129 __func__, 1130 inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, 1131 sizeof(ntopbuf)), ipr->ipr_plen, ifi->ifi_ifname); 1132 1133 rai->rai_pfxs++; 1134} 1135 1136/* 1137 * Delete a prefix to the list of specified interface and reconstruct 1138 * the outgoing packet. 1139 * The prefix must be in the list. 1140 */ 1141void 1142delete_prefix(struct prefix *pfx) 1143{ 1144 struct rainfo *rai; 1145 struct ifinfo *ifi; 1146 char ntopbuf[INET6_ADDRSTRLEN]; 1147 1148 rai = pfx->pfx_rainfo; 1149 ifi = rai->rai_ifinfo; 1150 TAILQ_REMOVE(&rai->rai_prefix, pfx, pfx_next); 1151 syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s", 1152 __func__, 1153 inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, 1154 sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname); 1155 if (pfx->pfx_timer) 1156 rtadvd_remove_timer(pfx->pfx_timer); 1157 free(pfx); 1158 1159 rai->rai_pfxs--; 1160} 1161 1162void 1163invalidate_prefix(struct prefix *pfx) 1164{ 1165 struct timeval timo; 1166 struct rainfo *rai; 1167 struct ifinfo *ifi; 1168 char ntopbuf[INET6_ADDRSTRLEN]; 1169 1170 rai = pfx->pfx_rainfo; 1171 ifi = rai->rai_ifinfo; 1172 if (pfx->pfx_timer) { /* sanity check */ 1173 syslog(LOG_ERR, 1174 "<%s> assumption failure: timer already exists", 1175 __func__); 1176 exit(1); 1177 } 1178 1179 syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, " 1180 "will expire in %ld seconds", __func__, 1181 inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, sizeof(ntopbuf)), 1182 pfx->pfx_prefixlen, ifi->ifi_ifname, (long)prefix_timo); 1183 1184 /* set the expiration timer */ 1185 pfx->pfx_timer = rtadvd_add_timer(prefix_timeout, NULL, pfx, NULL); 1186 if (pfx->pfx_timer == NULL) { 1187 syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. " 1188 "remove the prefix", __func__); 1189 delete_prefix(pfx); 1190 } 1191 timo.tv_sec = prefix_timo; 1192 timo.tv_usec = 0; 1193 rtadvd_set_timer(&timo, pfx->pfx_timer); 1194} 1195 1196static struct rtadvd_timer * 1197prefix_timeout(void *arg) 1198{ 1199 1200 delete_prefix((struct prefix *)arg); 1201 1202 return (NULL); 1203} 1204 1205void 1206update_prefix(struct prefix *pfx) 1207{ 1208 struct rainfo *rai; 1209 struct ifinfo *ifi; 1210 char ntopbuf[INET6_ADDRSTRLEN]; 1211 1212 rai = pfx->pfx_rainfo; 1213 ifi = rai->rai_ifinfo; 1214 if (pfx->pfx_timer == NULL) { /* sanity check */ 1215 syslog(LOG_ERR, 1216 "<%s> assumption failure: timer does not exist", 1217 __func__); 1218 exit(1); 1219 } 1220 1221 syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s", 1222 __func__, inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, 1223 sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname); 1224 1225 /* stop the expiration timer */ 1226 rtadvd_remove_timer(pfx->pfx_timer); 1227 pfx->pfx_timer = NULL; 1228} 1229 1230/* 1231 * Try to get an in6_prefixreq contents for a prefix which matches 1232 * ipr->ipr_prefix and ipr->ipr_plen and belongs to 1233 * the interface whose name is ipr->ipr_name[]. 1234 */ 1235static int 1236init_prefix(struct in6_prefixreq *ipr) 1237{ 1238#if 0 1239 int s; 1240 1241 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 1242 syslog(LOG_ERR, "<%s> socket: %s", __func__, 1243 strerror(errno)); 1244 exit(1); 1245 } 1246 1247 if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) { 1248 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __func__, 1249 strerror(errno)); 1250 1251 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME; 1252 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME; 1253 ipr->ipr_raf_onlink = 1; 1254 ipr->ipr_raf_auto = 1; 1255 /* omit other field initialization */ 1256 } 1257 else if (ipr->ipr_origin < PR_ORIG_RR) { 1258 char ntopbuf[INET6_ADDRSTRLEN]; 1259 1260 syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is" 1261 "lower than PR_ORIG_RR(router renumbering)." 1262 "This should not happen if I am router", __func__, 1263 inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf, 1264 sizeof(ntopbuf)), ipr->ipr_origin); 1265 close(s); 1266 return (1); 1267 } 1268 1269 close(s); 1270 return (0); 1271#else 1272 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME; 1273 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME; 1274 ipr->ipr_raf_onlink = 1; 1275 ipr->ipr_raf_auto = 1; 1276 return (0); 1277#endif 1278} 1279 1280void 1281make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen) 1282{ 1283 struct in6_prefixreq ipr; 1284 1285 memset(&ipr, 0, sizeof(ipr)); 1286 if (if_indextoname(ifindex, ipr.ipr_name) == NULL) { 1287 syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't" 1288 "exist. This should not happen! %s", __func__, 1289 ifindex, strerror(errno)); 1290 exit(1); 1291 } 1292 ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix); 1293 ipr.ipr_prefix.sin6_family = AF_INET6; 1294 ipr.ipr_prefix.sin6_addr = *addr; 1295 ipr.ipr_plen = plen; 1296 1297 if (init_prefix(&ipr)) 1298 return; /* init failed by some error */ 1299 add_prefix(rai, &ipr); 1300} 1301 1302void 1303make_packet(struct rainfo *rai) 1304{ 1305 size_t packlen, lladdroptlen = 0; 1306 char *buf; 1307 struct nd_router_advert *ra; 1308 struct nd_opt_prefix_info *ndopt_pi; 1309 struct nd_opt_mtu *ndopt_mtu; 1310 struct nd_opt_route_info *ndopt_rti; 1311 struct rtinfo *rti; 1312 struct nd_opt_rdnss *ndopt_rdnss; 1313 struct rdnss *rdn; 1314 struct nd_opt_dnssl *ndopt_dnssl; 1315 struct dnssl *dns; 1316 size_t len; 1317 struct prefix *pfx; 1318 struct ifinfo *ifi; 1319 1320 ifi = rai->rai_ifinfo; 1321 /* calculate total length */ 1322 packlen = sizeof(struct nd_router_advert); 1323 if (rai->rai_advlinkopt) { 1324 if ((lladdroptlen = lladdropt_length(&ifi->ifi_sdl)) == 0) { 1325 syslog(LOG_INFO, 1326 "<%s> link-layer address option has" 1327 " null length on %s. Treat as not included.", 1328 __func__, ifi->ifi_ifname); 1329 rai->rai_advlinkopt = 0; 1330 } 1331 packlen += lladdroptlen; 1332 } 1333 if (rai->rai_pfxs) 1334 packlen += sizeof(struct nd_opt_prefix_info) * rai->rai_pfxs; 1335 if (rai->rai_linkmtu) 1336 packlen += sizeof(struct nd_opt_mtu); 1337 1338 TAILQ_FOREACH(rti, &rai->rai_route, rti_next) 1339 packlen += sizeof(struct nd_opt_route_info) + 1340 ((rti->rti_prefixlen + 0x3f) >> 6) * 8; 1341 1342 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) { 1343 struct rdnss_addr *rdna; 1344 1345 packlen += sizeof(struct nd_opt_rdnss); 1346 TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next) 1347 packlen += sizeof(rdna->ra_dns); 1348 } 1349 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) { 1350 struct dnssl_addr *dnsa; 1351 1352 packlen += sizeof(struct nd_opt_dnssl); 1353 len = 0; 1354 TAILQ_FOREACH(dnsa, &dns->dn_list, da_next) 1355 len += dnsa->da_len; 1356 1357 /* A zero octet and 8 octet boundary */ 1358 len++; 1359 len += (len % 8) ? 8 - len % 8 : 0; 1360 1361 packlen += len; 1362 } 1363 /* allocate memory for the packet */ 1364 if ((buf = malloc(packlen)) == NULL) { 1365 syslog(LOG_ERR, 1366 "<%s> can't get enough memory for an RA packet", 1367 __func__); 1368 exit(1); 1369 } 1370 memset(buf, 0, packlen); 1371 if (rai->rai_ra_data) /* Free old data if any. */ 1372 free(rai->rai_ra_data); 1373 rai->rai_ra_data = buf; 1374 /* XXX: what if packlen > 576? */ 1375 rai->rai_ra_datalen = packlen; 1376 1377 /* 1378 * construct the packet 1379 */ 1380 ra = (struct nd_router_advert *)buf; 1381 ra->nd_ra_type = ND_ROUTER_ADVERT; 1382 ra->nd_ra_code = 0; 1383 ra->nd_ra_cksum = 0; 1384 ra->nd_ra_curhoplimit = (uint8_t)(0xff & rai->rai_hoplimit); 1385 ra->nd_ra_flags_reserved = 0; /* just in case */ 1386 /* 1387 * XXX: the router preference field, which is a 2-bit field, should be 1388 * initialized before other fields. 1389 */ 1390 ra->nd_ra_flags_reserved = 0xff & rai->rai_rtpref; 1391 ra->nd_ra_flags_reserved |= 1392 rai->rai_managedflg ? ND_RA_FLAG_MANAGED : 0; 1393 ra->nd_ra_flags_reserved |= 1394 rai->rai_otherflg ? ND_RA_FLAG_OTHER : 0; 1395 ra->nd_ra_router_lifetime = htons(rai->rai_lifetime); 1396 ra->nd_ra_reachable = htonl(rai->rai_reachabletime); 1397 ra->nd_ra_retransmit = htonl(rai->rai_retranstimer); 1398 buf += sizeof(*ra); 1399 1400 if (rai->rai_advlinkopt) { 1401 lladdropt_fill(&ifi->ifi_sdl, (struct nd_opt_hdr *)buf); 1402 buf += lladdroptlen; 1403 } 1404 1405 if (rai->rai_linkmtu) { 1406 ndopt_mtu = (struct nd_opt_mtu *)buf; 1407 ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU; 1408 ndopt_mtu->nd_opt_mtu_len = 1; 1409 ndopt_mtu->nd_opt_mtu_reserved = 0; 1410 ndopt_mtu->nd_opt_mtu_mtu = htonl(rai->rai_linkmtu); 1411 buf += sizeof(struct nd_opt_mtu); 1412 } 1413 1414 TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) { 1415 uint32_t vltime, pltime; 1416 struct timeval now; 1417 1418 ndopt_pi = (struct nd_opt_prefix_info *)buf; 1419 ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION; 1420 ndopt_pi->nd_opt_pi_len = 4; 1421 ndopt_pi->nd_opt_pi_prefix_len = pfx->pfx_prefixlen; 1422 ndopt_pi->nd_opt_pi_flags_reserved = 0; 1423 if (pfx->pfx_onlinkflg) 1424 ndopt_pi->nd_opt_pi_flags_reserved |= 1425 ND_OPT_PI_FLAG_ONLINK; 1426 if (pfx->pfx_autoconfflg) 1427 ndopt_pi->nd_opt_pi_flags_reserved |= 1428 ND_OPT_PI_FLAG_AUTO; 1429 if (pfx->pfx_timer) 1430 vltime = 0; 1431 else { 1432 if (pfx->pfx_vltimeexpire || pfx->pfx_pltimeexpire) 1433 gettimeofday(&now, NULL); 1434 if (pfx->pfx_vltimeexpire == 0) 1435 vltime = pfx->pfx_validlifetime; 1436 else 1437 vltime = ((time_t)pfx->pfx_vltimeexpire > now.tv_sec) ? 1438 pfx->pfx_vltimeexpire - now.tv_sec : 0; 1439 } 1440 if (pfx->pfx_timer) 1441 pltime = 0; 1442 else { 1443 if (pfx->pfx_pltimeexpire == 0) 1444 pltime = pfx->pfx_preflifetime; 1445 else 1446 pltime = ((time_t)pfx->pfx_pltimeexpire > now.tv_sec) ? 1447 pfx->pfx_pltimeexpire - now.tv_sec : 0; 1448 } 1449 if (vltime < pltime) { 1450 /* 1451 * this can happen if vltime is decrement but pltime 1452 * is not. 1453 */ 1454 pltime = vltime; 1455 } 1456 ndopt_pi->nd_opt_pi_valid_time = htonl(vltime); 1457 ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime); 1458 ndopt_pi->nd_opt_pi_reserved2 = 0; 1459 ndopt_pi->nd_opt_pi_prefix = pfx->pfx_prefix; 1460 1461 buf += sizeof(struct nd_opt_prefix_info); 1462 } 1463 1464 TAILQ_FOREACH(rti, &rai->rai_route, rti_next) { 1465 uint8_t psize = (rti->rti_prefixlen + 0x3f) >> 6; 1466 1467 ndopt_rti = (struct nd_opt_route_info *)buf; 1468 ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO; 1469 ndopt_rti->nd_opt_rti_len = 1 + psize; 1470 ndopt_rti->nd_opt_rti_prefixlen = rti->rti_prefixlen; 1471 ndopt_rti->nd_opt_rti_flags = 0xff & rti->rti_rtpref; 1472 ndopt_rti->nd_opt_rti_lifetime = htonl(rti->rti_ltime); 1473 memcpy(ndopt_rti + 1, &rti->rti_prefix, psize * 8); 1474 buf += sizeof(struct nd_opt_route_info) + psize * 8; 1475 } 1476 1477 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) { 1478 struct rdnss_addr *rdna; 1479 1480 ndopt_rdnss = (struct nd_opt_rdnss *)buf; 1481 ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS; 1482 ndopt_rdnss->nd_opt_rdnss_len = 0; 1483 ndopt_rdnss->nd_opt_rdnss_reserved = 0; 1484 ndopt_rdnss->nd_opt_rdnss_lifetime = htonl(rdn->rd_ltime); 1485 buf += sizeof(struct nd_opt_rdnss); 1486 1487 TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next) { 1488 memcpy(buf, &rdna->ra_dns, sizeof(rdna->ra_dns)); 1489 buf += sizeof(rdna->ra_dns); 1490 } 1491 /* Length field should be in 8 octets */ 1492 ndopt_rdnss->nd_opt_rdnss_len = (buf - (char *)ndopt_rdnss) / 8; 1493 1494 syslog(LOG_DEBUG, "<%s>: nd_opt_dnss_len = %d", __func__, 1495 ndopt_rdnss->nd_opt_rdnss_len); 1496 } 1497 1498 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) { 1499 struct dnssl_addr *dnsa; 1500 1501 ndopt_dnssl = (struct nd_opt_dnssl *)buf; 1502 ndopt_dnssl->nd_opt_dnssl_type = ND_OPT_DNSSL; 1503 ndopt_dnssl->nd_opt_dnssl_len = 0; 1504 ndopt_dnssl->nd_opt_dnssl_reserved = 0; 1505 ndopt_dnssl->nd_opt_dnssl_lifetime = htonl(dns->dn_ltime); 1506 buf += sizeof(*ndopt_dnssl); 1507 1508 TAILQ_FOREACH(dnsa, &dns->dn_list, da_next) { 1509 memcpy(buf, dnsa->da_dom, dnsa->da_len); 1510 buf += dnsa->da_len; 1511 } 1512 1513 /* A zero octet after encoded DNS server list. */ 1514 *buf++ = '\0'; 1515 1516 /* Padding to next 8 octets boundary */ 1517 len = buf - (char *)ndopt_dnssl; 1518 len += (len % 8) ? 8 - len % 8 : 0; 1519 1520 /* Length field must be in 8 octets */ 1521 ndopt_dnssl->nd_opt_dnssl_len = len / 8; 1522 1523 syslog(LOG_DEBUG, "<%s>: nd_opt_dnssl_len = %d", __func__, 1524 ndopt_dnssl->nd_opt_dnssl_len); 1525 } 1526 return; 1527} 1528