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sys/bsd/netinet6/nd6_rtr.c
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1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.11 2002/04/19 04:46:23 suz Exp $ */ 2 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 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 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/malloc.h> 37 #include <sys/mbuf.h> 38 #include <sys/socket.h> 39 #include <sys/sockio.h> 40 #include <sys/time.h> 41 #include <sys/kernel.h> 42 #include <sys/errno.h> 43 #include <sys/syslog.h> 44 #include <sys/queue.h> 45 46 #include <net/if.h> 47 #include <net/if_types.h> 48 #include <net/if_dl.h> 49 #include <net/route.h> 50 #include <net/radix.h> 51 52 #include <netinet/in.h> 53 #include <netinet6/in6_var.h> 54 #include <netinet6/in6_ifattach.h> 55 #include <netinet/ip6.h> 56 #include <netinet6/ip6_var.h> 57 #include <netinet6/nd6.h> 58 #include <netinet/icmp6.h> 59 #include <netinet6/scope6_var.h> 60 61 #include <net/net_osdep.h> 62 63 #define SDL(s) ((struct sockaddr_dl *)s) 64 65 static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *)); 66 static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *, 67 struct in6_addr *)); 68 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *, 69 struct nd_defrouter *)); 70 static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *)); 71 static void pfxrtr_del __P((struct nd_pfxrouter *)); 72 static struct nd_pfxrouter *find_pfxlist_reachable_router 73 __P((struct nd_prefix *)); 74 static void defrouter_addifreq __P((struct ifnet *)); 75 static void nd6_rtmsg __P((int, struct rtentry *)); 76 77 static void in6_init_address_ltimes __P((struct nd_prefix *ndpr, 78 struct in6_addrlifetime *lt6)); 79 80 static int rt6_deleteroute __P((struct radix_node *, void *)); 81 82 extern int nd6_recalc_reachtm_interval; 83 84 static struct ifnet *nd6_defifp; 85 int nd6_defifindex; 86 87 int ip6_use_tempaddr = 0; 88 89 int ip6_desync_factor; 90 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; 91 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; 92 /* 93 * shorter lifetimes for debugging purposes. 94 int ip6_temp_preferred_lifetime = 800; 95 static int ip6_temp_valid_lifetime = 1800; 96 */ 97 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; 98 99 /* 100 * Receive Router Solicitation Message - just for routers. 101 * Router solicitation/advertisement is mostly managed by userland program 102 * (rtadvd) so here we have no function like nd6_ra_output(). 103 * 104 * Based on RFC 2461 105 */ 106 void 107 nd6_rs_input(m, off, icmp6len) 108 struct mbuf *m; 109 int off, icmp6len; 110 { 111 struct ifnet *ifp = m->m_pkthdr.rcvif; 112 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 113 struct nd_router_solicit *nd_rs; 114 struct in6_addr saddr6 = ip6->ip6_src; 115 #if 0 116 struct in6_addr daddr6 = ip6->ip6_dst; 117 #endif 118 char *lladdr = NULL; 119 int lladdrlen = 0; 120 #if 0 121 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL; 122 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; 123 struct rtentry *rt = NULL; 124 int is_newentry; 125 #endif 126 union nd_opts ndopts; 127 128 /* If I'm not a router, ignore it. */ 129 if (ip6_accept_rtadv != 0 || (ifp->if_eflags & IFEF_ACCEPT_RTADVD) || ip6_forwarding != 1) 130 goto freeit; 131 132 /* Sanity checks */ 133 if (ip6->ip6_hlim != 255) { 134 nd6log((LOG_ERR, 135 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 136 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 137 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 138 goto bad; 139 } 140 141 /* 142 * Don't update the neighbor cache, if src = ::. 143 * This indicates that the src has no IP address assigned yet. 144 */ 145 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 146 goto freeit; 147 148 #ifndef PULLDOWN_TEST 149 IP6_EXTHDR_CHECK(m, off, icmp6len,); 150 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 151 #else 152 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 153 if (nd_rs == NULL) { 154 icmp6stat.icp6s_tooshort++; 155 return; 156 } 157 #endif 158 159 icmp6len -= sizeof(*nd_rs); 160 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 161 if (nd6_options(&ndopts) < 0) { 162 nd6log((LOG_INFO, 163 "nd6_rs_input: invalid ND option, ignored\n")); 164 /* nd6_options have incremented stats */ 165 goto freeit; 166 } 167 168 if (ndopts.nd_opts_src_lladdr) { 169 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 170 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 171 } 172 173 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 174 nd6log((LOG_INFO, 175 "nd6_rs_input: lladdrlen mismatch for %s " 176 "(if %d, RS packet %d)\n", 177 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 178 goto bad; 179 } 180 181 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 182 183 freeit: 184 m_freem(m); 185 return; 186 187 bad: 188 icmp6stat.icp6s_badrs++; 189 m_freem(m); 190 } 191 192 /* 193 * Receive Router Advertisement Message. 194 * 195 * Based on RFC 2461 196 * TODO: on-link bit on prefix information 197 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 198 */ 199 void 200 nd6_ra_input(m, off, icmp6len) 201 struct mbuf *m; 202 int off, icmp6len; 203 { 204 struct ifnet *ifp = m->m_pkthdr.rcvif; 205 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 206 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 207 struct nd_router_advert *nd_ra; 208 struct in6_addr saddr6 = ip6->ip6_src; 209 #if 0 210 struct in6_addr daddr6 = ip6->ip6_dst; 211 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 212 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 213 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 214 #endif 215 union nd_opts ndopts; 216 struct nd_defrouter *dr; 217 218 if (ip6_accept_rtadv == 0 && ((ifp->if_eflags & IFEF_ACCEPT_RTADVD) == 0)) 219 goto freeit; 220 221 if (ip6->ip6_hlim != 255) { 222 nd6log((LOG_ERR, 223 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 224 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 225 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 226 goto bad; 227 } 228 229 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 230 nd6log((LOG_ERR, 231 "nd6_ra_input: src %s is not link-local\n", 232 ip6_sprintf(&saddr6))); 233 goto bad; 234 } 235 236 #ifndef PULLDOWN_TEST 237 IP6_EXTHDR_CHECK(m, off, icmp6len,); 238 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 239 #else 240 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 241 if (nd_ra == NULL) { 242 icmp6stat.icp6s_tooshort++; 243 return; 244 } 245 #endif 246 247 icmp6len -= sizeof(*nd_ra); 248 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 249 if (nd6_options(&ndopts) < 0) { 250 nd6log((LOG_INFO, 251 "nd6_ra_input: invalid ND option, ignored\n")); 252 /* nd6_options have incremented stats */ 253 goto freeit; 254 } 255 256 { 257 struct nd_defrouter dr0; 258 u_int32_t advreachable = nd_ra->nd_ra_reachable; 259 260 dr0.rtaddr = saddr6; 261 dr0.flags = nd_ra->nd_ra_flags_reserved; 262 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 263 dr0.expire = time_second + dr0.rtlifetime; 264 dr0.ifp = ifp; 265 dr0.advint = 0; /* Mobile IPv6 */ 266 dr0.advint_expire = 0; /* Mobile IPv6 */ 267 dr0.advints_lost = 0; /* Mobile IPv6 */ 268 /* unspecified or not? (RFC 2461 6.3.4) */ 269 if (advreachable) { 270 advreachable = ntohl(advreachable); 271 if (advreachable <= MAX_REACHABLE_TIME && 272 ndi->basereachable != advreachable) { 273 ndi->basereachable = advreachable; 274 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 275 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 276 } 277 } 278 if (nd_ra->nd_ra_retransmit) 279 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 280 if (nd_ra->nd_ra_curhoplimit) 281 ndi->chlim = nd_ra->nd_ra_curhoplimit; 282 dr = defrtrlist_update(&dr0); 283 } 284 285 /* 286 * prefix 287 */ 288 if (ndopts.nd_opts_pi) { 289 struct nd_opt_hdr *pt; 290 struct nd_opt_prefix_info *pi = NULL; 291 struct nd_prefix pr; 292 293 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 294 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 295 pt = (struct nd_opt_hdr *)((caddr_t)pt + 296 (pt->nd_opt_len << 3))) { 297 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 298 continue; 299 pi = (struct nd_opt_prefix_info *)pt; 300 301 if (pi->nd_opt_pi_len != 4) { 302 nd6log((LOG_INFO, 303 "nd6_ra_input: invalid option " 304 "len %d for prefix information option, " 305 "ignored\n", pi->nd_opt_pi_len)); 306 continue; 307 } 308 309 if (128 < pi->nd_opt_pi_prefix_len) { 310 nd6log((LOG_INFO, 311 "nd6_ra_input: invalid prefix " 312 "len %d for prefix information option, " 313 "ignored\n", pi->nd_opt_pi_prefix_len)); 314 continue; 315 } 316 317 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 318 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 319 nd6log((LOG_INFO, 320 "nd6_ra_input: invalid prefix " 321 "%s, ignored\n", 322 ip6_sprintf(&pi->nd_opt_pi_prefix))); 323 continue; 324 } 325 326 /* aggregatable unicast address, rfc2374 */ 327 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 328 && pi->nd_opt_pi_prefix_len != 64) { 329 nd6log((LOG_INFO, 330 "nd6_ra_input: invalid prefixlen " 331 "%d for rfc2374 prefix %s, ignored\n", 332 pi->nd_opt_pi_prefix_len, 333 ip6_sprintf(&pi->nd_opt_pi_prefix))); 334 continue; 335 } 336 337 bzero(&pr, sizeof(pr)); 338 pr.ndpr_prefix.sin6_family = AF_INET6; 339 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 340 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 341 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 342 343 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 344 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 345 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 346 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 347 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 348 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 349 pr.ndpr_pltime = 350 ntohl(pi->nd_opt_pi_preferred_time); 351 352 if (in6_init_prefix_ltimes(&pr)) 353 continue; /* prefix lifetime init failed */ 354 355 (void)prelist_update(&pr, dr, m); 356 } 357 } 358 359 /* 360 * MTU 361 */ 362 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 363 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 364 365 /* lower bound */ 366 if (mtu < IPV6_MMTU) { 367 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 368 "mtu=%d sent from %s, ignoring\n", 369 mtu, ip6_sprintf(&ip6->ip6_src))); 370 goto skip; 371 } 372 373 /* upper bound */ 374 if (ndi->maxmtu) { 375 if (mtu <= ndi->maxmtu) { 376 int change = (ndi->linkmtu != mtu); 377 378 ndi->linkmtu = mtu; 379 if (change) /* in6_maxmtu may change */ 380 in6_setmaxmtu(); 381 } else { 382 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 383 "mtu=%d sent from %s; " 384 "exceeds maxmtu %d, ignoring\n", 385 mtu, ip6_sprintf(&ip6->ip6_src), 386 ndi->maxmtu)); 387 } 388 } else { 389 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 390 "mtu=%d sent from %s; maxmtu unknown, " 391 "ignoring\n", 392 mtu, ip6_sprintf(&ip6->ip6_src))); 393 } 394 } 395 396 skip: 397 398 /* 399 * Source link layer address 400 */ 401 { 402 char *lladdr = NULL; 403 int lladdrlen = 0; 404 405 if (ndopts.nd_opts_src_lladdr) { 406 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 407 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 408 } 409 410 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 411 nd6log((LOG_INFO, 412 "nd6_ra_input: lladdrlen mismatch for %s " 413 "(if %d, RA packet %d)\n", 414 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 415 goto bad; 416 } 417 418 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 419 420 /* 421 * Installing a link-layer address might change the state of the 422 * router's neighbor cache, which might also affect our on-link 423 * detection of adveritsed prefixes. 424 */ 425 pfxlist_onlink_check(); 426 } 427 428 freeit: 429 m_freem(m); 430 return; 431 432 bad: 433 icmp6stat.icp6s_badra++; 434 m_freem(m); 435 } 436 437 /* 438 * default router list proccessing sub routines 439 */ 440 441 /* tell the change to user processes watching the routing socket. */ 442 static void 443 nd6_rtmsg(cmd, rt) 444 int cmd; 445 struct rtentry *rt; 446 { 447 struct rt_addrinfo info; 448 449 bzero((caddr_t)&info, sizeof(info)); 450 info.rti_info[RTAX_DST] = rt_key(rt); 451 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 452 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 453 info.rti_info[RTAX_IFP] = 454 TAILQ_FIRST(&rt->rt_ifp->if_addrlist)->ifa_addr; 455 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 456 457 rt_missmsg(cmd, &info, rt->rt_flags, 0); 458 } 459 460 void 461 defrouter_addreq(new) 462 struct nd_defrouter *new; 463 { 464 struct sockaddr_in6 def, mask, gate; 465 struct rtentry *newrt = NULL; 466 int s; 467 468 Bzero(&def, sizeof(def)); 469 Bzero(&mask, sizeof(mask)); 470 Bzero(&gate, sizeof(gate)); 471 472 def.sin6_len = mask.sin6_len = gate.sin6_len 473 = sizeof(struct sockaddr_in6); 474 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 475 gate.sin6_addr = new->rtaddr; 476 477 s = splnet(); 478 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, 479 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 480 RTF_GATEWAY, &newrt); 481 if (newrt) { 482 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 483 rtunref(newrt); 484 } 485 splx(s); 486 return; 487 } 488 489 /* Add a route to a given interface as default */ 490 void 491 defrouter_addifreq(ifp) 492 struct ifnet *ifp; 493 { 494 struct sockaddr_in6 def, mask; 495 struct ifaddr *ifa; 496 struct rtentry *newrt = NULL; 497 int error, flags; 498 499 bzero(&def, sizeof(def)); 500 bzero(&mask, sizeof(mask)); 501 502 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 503 def.sin6_family = mask.sin6_family = AF_INET6; 504 505 /* 506 * Search for an ifaddr beloging to the specified interface. 507 * XXX: An IPv6 address are required to be assigned on the interface. 508 */ 509 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 510 nd6log((LOG_ERR, /* better error? */ 511 "defrouter_addifreq: failed to find an ifaddr " 512 "to install a route to interface %s\n", 513 if_name(ifp))); 514 return; 515 } 516 517 flags = ifa->ifa_flags; 518 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, 519 (struct sockaddr *)&mask, flags, &newrt); 520 if (error != 0) { 521 nd6log((LOG_ERR, 522 "defrouter_addifreq: failed to install a route to " 523 "interface %s (errno = %d)\n", 524 if_name(ifp), error)); 525 526 if (newrt) /* maybe unnecessary, but do it for safety */ 527 rtunref(newrt); 528 } else { 529 if (newrt) { 530 nd6_rtmsg(RTM_ADD, newrt); 531 rtunref(newrt); 532 } 533 in6_post_msg(ifp, KEV_INET6_DEFROUTER, (struct in6_ifaddr *)ifa); 534 } 535 } 536 537 struct nd_defrouter * 538 defrouter_lookup(addr, ifp) 539 struct in6_addr *addr; 540 struct ifnet *ifp; 541 { 542 struct nd_defrouter *dr; 543 544 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 545 dr = TAILQ_NEXT(dr, dr_entry)) { 546 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 547 return(dr); 548 } 549 550 return(NULL); /* search failed */ 551 } 552 553 void 554 defrouter_delreq(dr, dofree) 555 struct nd_defrouter *dr; 556 int dofree; 557 { 558 struct sockaddr_in6 def, mask, gate; 559 struct rtentry *oldrt = NULL; 560 561 Bzero(&def, sizeof(def)); 562 Bzero(&mask, sizeof(mask)); 563 Bzero(&gate, sizeof(gate)); 564 565 def.sin6_len = mask.sin6_len = gate.sin6_len 566 = sizeof(struct sockaddr_in6); 567 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 568 gate.sin6_addr = dr->rtaddr; 569 570 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 571 (struct sockaddr *)&gate, 572 (struct sockaddr *)&mask, 573 RTF_GATEWAY, &oldrt); 574 if (oldrt) { 575 nd6_rtmsg(RTM_DELETE, oldrt); 576 if (oldrt->rt_refcnt <= 0) { 577 /* 578 * XXX: borrowed from the RTM_DELETE case of 579 * rtrequest(). 580 */ 581 rtref(oldrt); 582 rtfree(oldrt); 583 } 584 } 585 586 if (dofree) /* XXX: necessary? */ 587 FREE(dr, M_IP6NDP); 588 } 589 590 void 591 defrtrlist_del(dr) 592 struct nd_defrouter *dr; 593 { 594 struct nd_defrouter *deldr = NULL; 595 struct nd_prefix *pr; 596 597 /* 598 * Flush all the routing table entries that use the router 599 * as a next hop. 600 */ 601 if (!ip6_forwarding && (ip6_accept_rtadv || (dr->ifp->if_eflags & IFEF_ACCEPT_RTADVD))) { 602 /* above is a good condition? */ 603 rt6_flush(&dr->rtaddr, dr->ifp); 604 } 605 606 if (dr == TAILQ_FIRST(&nd_defrouter)) 607 deldr = dr; /* The router is primary. */ 608 609 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 610 611 /* 612 * Also delete all the pointers to the router in each prefix lists. 613 */ 614 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 615 struct nd_pfxrouter *pfxrtr; 616 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 617 pfxrtr_del(pfxrtr); 618 } 619 pfxlist_onlink_check(); 620 621 /* 622 * If the router is the primary one, choose a new one. 623 * Note that defrouter_select() will remove the current gateway 624 * from the routing table. 625 */ 626 if (deldr) 627 defrouter_select(); 628 629 FREE(dr, M_IP6NDP); 630 } 631 632 /* 633 * Default Router Selection according to Section 6.3.6 of RFC 2461: 634 * 1) Routers that are reachable or probably reachable should be 635 * preferred. 636 * 2) When no routers on the list are known to be reachable or 637 * probably reachable, routers SHOULD be selected in a round-robin 638 * fashion. 639 * 3) If the Default Router List is empty, assume that all 640 * destinations are on-link. 641 */ 642 void 643 defrouter_select() 644 { 645 int s = splnet(); 646 struct nd_defrouter *dr, anydr; 647 struct rtentry *rt = NULL; 648 struct llinfo_nd6 *ln = NULL; 649 650 /* 651 * Search for a (probably) reachable router from the list. 652 */ 653 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 654 dr = TAILQ_NEXT(dr, dr_entry)) { 655 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 656 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 657 ND6_IS_LLINFO_PROBREACH(ln)) { 658 /* Got it, and move it to the head */ 659 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 660 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 661 break; 662 } 663 } 664 665 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 666 /* 667 * De-install the previous default gateway and install 668 * a new one. 669 * Note that if there is no reachable router in the list, 670 * the head entry will be used anyway. 671 * XXX: do we have to check the current routing table entry? 672 */ 673 bzero(&anydr, sizeof(anydr)); 674 defrouter_delreq(&anydr, 0); 675 defrouter_addreq(dr); 676 } 677 else { 678 /* 679 * The Default Router List is empty, so install the default 680 * route to an inteface. 681 * XXX: The specification does not say this mechanism should 682 * be restricted to hosts, but this would be not useful 683 * (even harmful) for routers. 684 */ 685 if (!ip6_forwarding) { 686 /* 687 * De-install the current default route 688 * in advance. 689 */ 690 bzero(&anydr, sizeof(anydr)); 691 defrouter_delreq(&anydr, 0); 692 if (nd6_defifp) { 693 /* 694 * Install a route to the default interface 695 * as default route. 696 * XXX: we enable this for host only, because 697 * this may override a default route installed 698 * a user process (e.g. routing daemon) in a 699 * router case. 700 */ 701 defrouter_addifreq(nd6_defifp); 702 } else { 703 nd6log((LOG_INFO, "defrouter_select: " 704 "there's no default router and no default" 705 " interface\n")); 706 } 707 } 708 } 709 710 splx(s); 711 return; 712 } 713 714 static struct nd_defrouter * 715 defrtrlist_update(new) 716 struct nd_defrouter *new; 717 { 718 struct nd_defrouter *dr, *n; 719 int s = splnet(); 720 721 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 722 /* entry exists */ 723 if (new->rtlifetime == 0) { 724 defrtrlist_del(dr); 725 dr = NULL; 726 } else { 727 /* override */ 728 dr->flags = new->flags; /* xxx flag check */ 729 dr->rtlifetime = new->rtlifetime; 730 dr->expire = new->expire; 731 } 732 splx(s); 733 return(dr); 734 } 735 736 /* entry does not exist */ 737 if (new->rtlifetime == 0) { 738 splx(s); 739 return(NULL); 740 } 741 742 n = (struct nd_defrouter *)_MALLOC(sizeof(*n), M_IP6NDP, M_NOWAIT); 743 if (n == NULL) { 744 splx(s); 745 return(NULL); 746 } 747 bzero(n, sizeof(*n)); 748 *n = *new; 749 750 /* 751 * Insert the new router at the end of the Default Router List. 752 * If there is no other router, install it anyway. Otherwise, 753 * just continue to use the current default router. 754 */ 755 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 756 if (TAILQ_FIRST(&nd_defrouter) == n) 757 defrouter_select(); 758 splx(s); 759 760 return(n); 761 } 762 763 static struct nd_pfxrouter * 764 pfxrtr_lookup(pr, dr) 765 struct nd_prefix *pr; 766 struct nd_defrouter *dr; 767 { 768 struct nd_pfxrouter *search; 769 770 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 771 if (search->router == dr) 772 break; 773 } 774 775 return(search); 776 } 777 778 static void 779 pfxrtr_add(pr, dr) 780 struct nd_prefix *pr; 781 struct nd_defrouter *dr; 782 { 783 struct nd_pfxrouter *new; 784 785 new = (struct nd_pfxrouter *)_MALLOC(sizeof(*new), M_IP6NDP, M_NOWAIT); 786 if (new == NULL) 787 return; 788 bzero(new, sizeof(*new)); 789 new->router = dr; 790 791 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 792 793 pfxlist_onlink_check(); 794 } 795 796 static void 797 pfxrtr_del(pfr) 798 struct nd_pfxrouter *pfr; 799 { 800 LIST_REMOVE(pfr, pfr_entry); 801 FREE(pfr, M_IP6NDP); 802 } 803 804 struct nd_prefix * 805 nd6_prefix_lookup(pr) 806 struct nd_prefix *pr; 807 { 808 struct nd_prefix *search; 809 810 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 811 if (pr->ndpr_ifp == search->ndpr_ifp && 812 pr->ndpr_plen == search->ndpr_plen && 813 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 814 &search->ndpr_prefix.sin6_addr, 815 pr->ndpr_plen) 816 ) { 817 break; 818 } 819 } 820 821 return(search); 822 } 823 824 int 825 nd6_prelist_add(pr, dr, newp) 826 struct nd_prefix *pr, **newp; 827 struct nd_defrouter *dr; 828 { 829 struct nd_prefix *new = NULL; 830 int i, s; 831 832 new = (struct nd_prefix *)_MALLOC(sizeof(*new), M_IP6NDP, M_NOWAIT); 833 if (new == NULL) 834 return ENOMEM; 835 bzero(new, sizeof(*new)); 836 *new = *pr; 837 if (newp != NULL) 838 *newp = new; 839 840 /* initilization */ 841 LIST_INIT(&new->ndpr_advrtrs); 842 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 843 /* make prefix in the canonical form */ 844 for (i = 0; i < 4; i++) 845 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 846 new->ndpr_mask.s6_addr32[i]; 847 848 s = splnet(); 849 /* link ndpr_entry to nd_prefix list */ 850 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 851 splx(s); 852 853 /* ND_OPT_PI_FLAG_ONLINK processing */ 854 if (new->ndpr_raf_onlink) { 855 int e; 856 857 if ((e = nd6_prefix_onlink(new)) != 0) { 858 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 859 "the prefix %s/%d on-link on %s (errno=%d)\n", 860 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 861 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 862 /* proceed anyway. XXX: is it correct? */ 863 } 864 } 865 866 if (dr) { 867 pfxrtr_add(new, dr); 868 } 869 870 return 0; 871 } 872 873 void 874 prelist_remove(pr) 875 struct nd_prefix *pr; 876 { 877 struct nd_pfxrouter *pfr, *next; 878 int e, s; 879 880 /* make sure to invalidate the prefix until it is really freed. */ 881 pr->ndpr_vltime = 0; 882 pr->ndpr_pltime = 0; 883 #if 0 884 /* 885 * Though these flags are now meaningless, we'd rather keep the value 886 * not to confuse users when executing "ndp -p". 887 */ 888 pr->ndpr_raf_onlink = 0; 889 pr->ndpr_raf_auto = 0; 890 #endif 891 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && 892 (e = nd6_prefix_offlink(pr)) != 0) { 893 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 894 "on %s, errno=%d\n", 895 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 896 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 897 /* what should we do? */ 898 } 899 900 if (pr->ndpr_refcnt > 0) 901 return; /* notice here? */ 902 903 s = splnet(); 904 905 /* unlink ndpr_entry from nd_prefix list */ 906 LIST_REMOVE(pr, ndpr_entry); 907 908 /* free list of routers that adversed the prefix */ 909 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 910 next = pfr->pfr_next; 911 912 FREE(pfr, M_IP6NDP); 913 } 914 splx(s); 915 916 FREE(pr, M_IP6NDP); 917 918 pfxlist_onlink_check(); 919 } 920 921 int 922 prelist_update(new, dr, m) 923 struct nd_prefix *new; 924 struct nd_defrouter *dr; /* may be NULL */ 925 struct mbuf *m; 926 { 927 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 928 struct ifaddr *ifa; 929 struct ifnet *ifp = new->ndpr_ifp; 930 struct nd_prefix *pr; 931 int s = splnet(); 932 int error = 0; 933 int newprefix = 0; 934 int auth; 935 struct in6_addrlifetime lt6_tmp; 936 937 auth = 0; 938 if (m) { 939 /* 940 * Authenticity for NA consists authentication for 941 * both IP header and IP datagrams, doesn't it ? 942 */ 943 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 944 auth = (m->m_flags & M_AUTHIPHDR 945 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 946 #endif 947 } 948 949 950 if ((pr = nd6_prefix_lookup(new)) != NULL) { 951 /* 952 * nd6_prefix_lookup() ensures that pr and new have the same 953 * prefix on a same interface. 954 */ 955 956 /* 957 * Update prefix information. Note that the on-link (L) bit 958 * and the autonomous (A) bit should NOT be changed from 1 959 * to 0. 960 */ 961 if (new->ndpr_raf_onlink == 1) 962 pr->ndpr_raf_onlink = 1; 963 if (new->ndpr_raf_auto == 1) 964 pr->ndpr_raf_auto = 1; 965 if (new->ndpr_raf_onlink) { 966 pr->ndpr_vltime = new->ndpr_vltime; 967 pr->ndpr_pltime = new->ndpr_pltime; 968 pr->ndpr_preferred = new->ndpr_preferred; 969 pr->ndpr_expire = new->ndpr_expire; 970 } 971 972 if (new->ndpr_raf_onlink && 973 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 974 int e; 975 976 if ((e = nd6_prefix_onlink(pr)) != 0) { 977 nd6log((LOG_ERR, 978 "prelist_update: failed to make " 979 "the prefix %s/%d on-link on %s " 980 "(errno=%d)\n", 981 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 982 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 983 /* proceed anyway. XXX: is it correct? */ 984 } 985 } 986 987 if (dr && pfxrtr_lookup(pr, dr) == NULL) 988 pfxrtr_add(pr, dr); 989 } else { 990 struct nd_prefix *newpr = NULL; 991 992 newprefix = 1; 993 994 if (new->ndpr_vltime == 0) 995 goto end; 996 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 997 goto end; 998 999 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 1000 1001 error = nd6_prelist_add(new, dr, &newpr); 1002 if (error != 0 || newpr == NULL) { 1003 nd6log((LOG_NOTICE, "prelist_update: " 1004 "nd6_prelist_add failed for %s/%d on %s " 1005 "errno=%d, returnpr=%p\n", 1006 ip6_sprintf(&new->ndpr_prefix.sin6_addr), 1007 new->ndpr_plen, if_name(new->ndpr_ifp), 1008 error, newpr)); 1009 goto end; /* we should just give up in this case. */ 1010 } 1011 1012 /* 1013 * XXX: from the ND point of view, we can ignore a prefix 1014 * with the on-link bit being zero. However, we need a 1015 * prefix structure for references from autoconfigured 1016 * addresses. Thus, we explicitly make suret that the prefix 1017 * itself expires now. 1018 */ 1019 if (newpr->ndpr_raf_onlink == 0) { 1020 newpr->ndpr_vltime = 0; 1021 newpr->ndpr_pltime = 0; 1022 in6_init_prefix_ltimes(newpr); 1023 } 1024 1025 pr = newpr; 1026 } 1027 1028 /* 1029 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1030 * Note that pr must be non NULL at this point. 1031 */ 1032 1033 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1034 if (!new->ndpr_raf_auto) 1035 goto afteraddrconf; 1036 1037 /* 1038 * 5.5.3 (b). the link-local prefix should have been ignored in 1039 * nd6_ra_input. 1040 */ 1041 1042 /* 1043 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. 1044 * This should have been done in nd6_ra_input. 1045 */ 1046 1047 /* 1048 * 5.5.3 (d). If the prefix advertised does not match the prefix of an 1049 * address already in the list, and the Valid Lifetime is not 0, 1050 * form an address. Note that even a manually configured address 1051 * should reject autoconfiguration of a new address. 1052 */ 1053 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1054 { 1055 struct in6_ifaddr *ifa6; 1056 int ifa_plen; 1057 u_int32_t storedlifetime; 1058 1059 if (ifa->ifa_addr->sa_family != AF_INET6) 1060 continue; 1061 1062 ifa6 = (struct in6_ifaddr *)ifa; 1063 1064 /* 1065 * Spec is not clear here, but I believe we should concentrate 1066 * on unicast (i.e. not anycast) addresses. 1067 * XXX: other ia6_flags? detached or duplicated? 1068 */ 1069 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1070 continue; 1071 1072 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); 1073 if (ifa_plen != new->ndpr_plen || 1074 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, 1075 &new->ndpr_prefix.sin6_addr, 1076 ifa_plen)) 1077 continue; 1078 1079 if (ia6_match == NULL) /* remember the first one */ 1080 ia6_match = ifa6; 1081 1082 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1083 continue; 1084 1085 /* 1086 * An already autoconfigured address matched. Now that we 1087 * are sure there is at least one matched address, we can 1088 * proceed to 5.5.3. (e): update the lifetimes according to the 1089 * "two hours" rule and the privacy extension. 1090 */ 1091 #define TWOHOUR (120*60) 1092 lt6_tmp = ifa6->ia6_lifetime; 1093 1094 storedlifetime = IFA6_IS_INVALID(ifa6) ? 0 : 1095 (lt6_tmp.ia6t_expire - time_second); 1096 1097 if (TWOHOUR < new->ndpr_vltime || 1098 storedlifetime < new->ndpr_vltime) { 1099 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1100 } else if (storedlifetime <= TWOHOUR 1101 #if 0 1102 /* 1103 * This condition is logically redundant, so we just 1104 * omit it. 1105 * See IPng 6712, 6717, and 6721. 1106 */ 1107 && new->ndpr_vltime <= storedlifetime 1108 #endif 1109 ) { 1110 if (auth) { 1111 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1112 } 1113 } else { 1114 /* 1115 * new->ndpr_vltime <= TWOHOUR && 1116 * TWOHOUR < storedlifetime 1117 */ 1118 lt6_tmp.ia6t_vltime = TWOHOUR; 1119 } 1120 1121 /* The 2 hour rule is not imposed for preferred lifetime. */ 1122 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1123 1124 in6_init_address_ltimes(pr, <6_tmp); 1125 1126 /* 1127 * When adjusting the lifetimes of an existing temporary 1128 * address, only lower the lifetimes. 1129 * RFC 3041 3.3. (1). 1130 * XXX: how should we modify ia6t_[pv]ltime? 1131 */ 1132 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 1133 if (lt6_tmp.ia6t_expire == 0 || /* no expire */ 1134 lt6_tmp.ia6t_expire > 1135 ifa6->ia6_lifetime.ia6t_expire) { 1136 lt6_tmp.ia6t_expire = 1137 ifa6->ia6_lifetime.ia6t_expire; 1138 } 1139 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ 1140 lt6_tmp.ia6t_preferred > 1141 ifa6->ia6_lifetime.ia6t_preferred) { 1142 lt6_tmp.ia6t_preferred = 1143 ifa6->ia6_lifetime.ia6t_preferred; 1144 } 1145 } 1146 1147 ifa6->ia6_lifetime = lt6_tmp; 1148 } 1149 if (ia6_match == NULL && new->ndpr_vltime) { 1150 /* 1151 * No address matched and the valid lifetime is non-zero. 1152 * Create a new address. 1153 */ 1154 if ((ia6 = in6_ifadd(new, NULL)) != NULL) { 1155 /* 1156 * note that we should use pr (not new) for reference. 1157 */ 1158 pr->ndpr_refcnt++; 1159 ia6->ia6_ndpr = pr; 1160 1161 #if 0 1162 /* XXXYYY Don't do this, according to Jinmei. */ 1163 pr->ndpr_addr = new->ndpr_addr; 1164 #endif 1165 1166 /* 1167 * RFC 3041 3.3 (2). 1168 * When a new public address is created as described 1169 * in RFC2462, also create a new temporary address. 1170 * 1171 * RFC 3041 3.5. 1172 * When an interface connects to a new link, a new 1173 * randomized interface identifier should be generated 1174 * immediately together with a new set of temporary 1175 * addresses. Thus, we specifiy 1 as the 2nd arg of 1176 * in6_tmpifadd(). 1177 */ 1178 if (ip6_use_tempaddr) { 1179 int e; 1180 if ((e = in6_tmpifadd(ia6, 1)) != 0) { 1181 nd6log((LOG_NOTICE, "prelist_update: " 1182 "failed to create a temporary " 1183 "address, errno=%d\n", 1184 e)); 1185 } 1186 } 1187 1188 /* 1189 * A newly added address might affect the status 1190 * of other addresses, so we check and update it. 1191 * XXX: what if address duplication happens? 1192 */ 1193 pfxlist_onlink_check(); 1194 } else { 1195 /* just set an error. do not bark here. */ 1196 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1197 } 1198 } 1199 1200 afteraddrconf: 1201 1202 end: 1203 splx(s); 1204 return error; 1205 } 1206 1207 /* 1208 * A supplement function used in the on-link detection below; 1209 * detect if a given prefix has a (probably) reachable advertising router. 1210 * XXX: lengthy function name... 1211 */ 1212 static struct nd_pfxrouter * 1213 find_pfxlist_reachable_router(pr) 1214 struct nd_prefix *pr; 1215 { 1216 struct nd_pfxrouter *pfxrtr; 1217 struct rtentry *rt; 1218 struct llinfo_nd6 *ln; 1219 1220 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1221 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1222 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1223 pfxrtr->router->ifp)) && 1224 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1225 ND6_IS_LLINFO_PROBREACH(ln)) 1226 break; /* found */ 1227 } 1228 1229 return(pfxrtr); 1230 1231 } 1232 1233 /* 1234 * Check if each prefix in the prefix list has at least one available router 1235 * that advertised the prefix (a router is "available" if its neighbor cache 1236 * entry is reachable or probably reachable). 1237 * If the check fails, the prefix may be off-link, because, for example, 1238 * we have moved from the network but the lifetime of the prefix has not 1239 * expired yet. So we should not use the prefix if there is another prefix 1240 * that has an available router. 1241 * But, if there is no prefix that has an available router, we still regards 1242 * all the prefixes as on-link. This is because we can't tell if all the 1243 * routers are simply dead or if we really moved from the network and there 1244 * is no router around us. 1245 */ 1246 void 1247 pfxlist_onlink_check() 1248 { 1249 struct nd_prefix *pr; 1250 struct in6_ifaddr *ifa; 1251 1252 /* 1253 * Check if there is a prefix that has a reachable advertising 1254 * router. 1255 */ 1256 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1257 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1258 break; 1259 } 1260 1261 if (pr) { 1262 /* 1263 * There is at least one prefix that has a reachable router. 1264 * Detach prefixes which have no reachable advertising 1265 * router, and attach other prefixes. 1266 */ 1267 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1268 /* XXX: a link-local prefix should never be detached */ 1269 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1270 continue; 1271 1272 /* 1273 * we aren't interested in prefixes without the L bit 1274 * set. 1275 */ 1276 if (pr->ndpr_raf_onlink == 0) 1277 continue; 1278 1279 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1280 find_pfxlist_reachable_router(pr) == NULL) 1281 pr->ndpr_stateflags |= NDPRF_DETACHED; 1282 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1283 find_pfxlist_reachable_router(pr) != 0) 1284 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1285 } 1286 } else { 1287 /* there is no prefix that has a reachable router */ 1288 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1289 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1290 continue; 1291 1292 if (pr->ndpr_raf_onlink == 0) 1293 continue; 1294 1295 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1296 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1297 } 1298 } 1299 1300 /* 1301 * Remove each interface route associated with a (just) detached 1302 * prefix, and reinstall the interface route for a (just) attached 1303 * prefix. Note that all attempt of reinstallation does not 1304 * necessarily success, when a same prefix is shared among multiple 1305 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1306 * so we don't have to care about them. 1307 */ 1308 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1309 int e; 1310 1311 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1312 continue; 1313 1314 if (pr->ndpr_raf_onlink == 0) 1315 continue; 1316 1317 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1318 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1319 if ((e = nd6_prefix_offlink(pr)) != 0) { 1320 nd6log((LOG_ERR, 1321 "pfxlist_onlink_check: failed to " 1322 "make %s/%d offlink, errno=%d\n", 1323 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1324 pr->ndpr_plen, e)); 1325 } 1326 } 1327 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1328 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && 1329 pr->ndpr_raf_onlink) { 1330 if ((e = nd6_prefix_onlink(pr)) != 0) { 1331 nd6log((LOG_ERR, 1332 "pfxlist_onlink_check: failed to " 1333 "make %s/%d offlink, errno=%d\n", 1334 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1335 pr->ndpr_plen, e)); 1336 } 1337 } 1338 } 1339 1340 /* 1341 * Changes on the prefix status might affect address status as well. 1342 * Make sure that all addresses derived from an attached prefix are 1343 * attached, and that all addresses derived from a detached prefix are 1344 * detached. Note, however, that a manually configured address should 1345 * always be attached. 1346 * The precise detection logic is same as the one for prefixes. 1347 */ 1348 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1349 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1350 continue; 1351 1352 if (ifa->ia6_ndpr == NULL) { 1353 /* 1354 * This can happen when we first configure the address 1355 * (i.e. the address exists, but the prefix does not). 1356 * XXX: complicated relationships... 1357 */ 1358 continue; 1359 } 1360 1361 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1362 break; 1363 } 1364 if (ifa) { 1365 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1366 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1367 continue; 1368 1369 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1370 continue; 1371 1372 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1373 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1374 else 1375 ifa->ia6_flags |= IN6_IFF_DETACHED; 1376 } 1377 } 1378 else { 1379 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1380 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1381 continue; 1382 1383 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1384 } 1385 } 1386 } 1387 1388 int 1389 nd6_prefix_onlink(pr) 1390 struct nd_prefix *pr; 1391 { 1392 struct ifaddr *ifa; 1393 struct ifnet *ifp = pr->ndpr_ifp; 1394 struct sockaddr_in6 mask6; 1395 struct nd_prefix *opr; 1396 u_long rtflags; 1397 int error = 0; 1398 struct rtentry *rt = NULL; 1399 1400 /* sanity check */ 1401 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1402 nd6log((LOG_ERR, 1403 "nd6_prefix_onlink: %s/%d is already on-link\n", 1404 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1405 return(EEXIST)); 1406 } 1407 1408 /* 1409 * Add the interface route associated with the prefix. Before 1410 * installing the route, check if there's the same prefix on another 1411 * interface, and the prefix has already installed the interface route. 1412 * Although such a configuration is expected to be rare, we explicitly 1413 * allow it. 1414 */ 1415 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1416 if (opr == pr) 1417 continue; 1418 1419 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1420 continue; 1421 1422 if (opr->ndpr_plen == pr->ndpr_plen && 1423 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1424 &opr->ndpr_prefix.sin6_addr, 1425 pr->ndpr_plen)) 1426 return(0); 1427 } 1428 1429 /* 1430 * We prefer link-local addresses as the associated interface address. 1431 */ 1432 /* search for a link-local addr */ 1433 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1434 IN6_IFF_NOTREADY| 1435 IN6_IFF_ANYCAST); 1436 if (ifa == NULL) { 1437 /* XXX: freebsd does not have ifa_ifwithaf */ 1438 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1439 { 1440 if (ifa->ifa_addr->sa_family == AF_INET6) 1441 break; 1442 } 1443 /* should we care about ia6_flags? */ 1444 } 1445 if (ifa == NULL) { 1446 /* 1447 * This can still happen, when, for example, we receive an RA 1448 * containing a prefix with the L bit set and the A bit clear, 1449 * after removing all IPv6 addresses on the receiving 1450 * interface. This should, of course, be rare though. 1451 */ 1452 nd6log((LOG_NOTICE, 1453 "nd6_prefix_onlink: failed to find any ifaddr" 1454 " to add route for a prefix(%s/%d) on %s\n", 1455 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1456 pr->ndpr_plen, if_name(ifp))); 1457 return(0); 1458 } 1459 1460 /* 1461 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1462 * ifa->ifa_rtrequest = nd6_rtrequest; 1463 */ 1464 bzero(&mask6, sizeof(mask6)); 1465 mask6.sin6_len = sizeof(mask6); 1466 mask6.sin6_addr = pr->ndpr_mask; 1467 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1468 if (nd6_need_cache(ifp)) { 1469 /* explicitly set in case ifa_flags does not set the flag. */ 1470 rtflags |= RTF_CLONING; 1471 } else { 1472 /* 1473 * explicitly clear the cloning bit in case ifa_flags sets it. 1474 */ 1475 rtflags &= ~RTF_CLONING; 1476 } 1477 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1478 ifa->ifa_addr, (struct sockaddr *)&mask6, 1479 rtflags, &rt); 1480 if (error == 0) { 1481 if (rt != NULL) /* this should be non NULL, though */ 1482 nd6_rtmsg(RTM_ADD, rt); 1483 pr->ndpr_stateflags |= NDPRF_ONLINK; 1484 } 1485 else { 1486 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1487 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1488 "errno = %d\n", 1489 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1490 pr->ndpr_plen, if_name(ifp), 1491 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1492 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1493 } 1494 1495 if (rt != NULL) 1496 rtunref(rt); 1497 1498 return(error); 1499 } 1500 1501 int 1502 nd6_prefix_offlink(pr) 1503 struct nd_prefix *pr; 1504 { 1505 int error = 0; 1506 struct ifnet *ifp = pr->ndpr_ifp; 1507 struct nd_prefix *opr; 1508 struct sockaddr_in6 sa6, mask6; 1509 struct rtentry *rt = NULL; 1510 1511 /* sanity check */ 1512 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1513 nd6log((LOG_ERR, 1514 "nd6_prefix_offlink: %s/%d is already off-link\n", 1515 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); 1516 return(EEXIST); 1517 } 1518 1519 bzero(&sa6, sizeof(sa6)); 1520 sa6.sin6_family = AF_INET6; 1521 sa6.sin6_len = sizeof(sa6); 1522 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1523 sizeof(struct in6_addr)); 1524 bzero(&mask6, sizeof(mask6)); 1525 mask6.sin6_family = AF_INET6; 1526 mask6.sin6_len = sizeof(sa6); 1527 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1528 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1529 (struct sockaddr *)&mask6, 0, &rt); 1530 if (error == 0) { 1531 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1532 1533 /* report the route deletion to the routing socket. */ 1534 if (rt != NULL) 1535 nd6_rtmsg(RTM_DELETE, rt); 1536 1537 /* 1538 * There might be the same prefix on another interface, 1539 * the prefix which could not be on-link just because we have 1540 * the interface route (see comments in nd6_prefix_onlink). 1541 * If there's one, try to make the prefix on-link on the 1542 * interface. 1543 */ 1544 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1545 if (opr == pr) 1546 continue; 1547 1548 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) 1549 continue; 1550 1551 /* 1552 * KAME specific: detached prefixes should not be 1553 * on-link. 1554 */ 1555 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1556 continue; 1557 1558 if (opr->ndpr_plen == pr->ndpr_plen && 1559 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1560 &opr->ndpr_prefix.sin6_addr, 1561 pr->ndpr_plen)) { 1562 int e; 1563 1564 if ((e = nd6_prefix_onlink(opr)) != 0) { 1565 nd6log((LOG_ERR, 1566 "nd6_prefix_offlink: failed to " 1567 "recover a prefix %s/%d from %s " 1568 "to %s (errno = %d)\n", 1569 ip6_sprintf(&opr->ndpr_prefix.sin6_addr), 1570 opr->ndpr_plen, if_name(ifp), 1571 if_name(opr->ndpr_ifp), e)); 1572 } 1573 } 1574 } 1575 } 1576 else { 1577 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1578 nd6log((LOG_ERR, 1579 "nd6_prefix_offlink: failed to delete route: " 1580 "%s/%d on %s (errno = %d)\n", 1581 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), 1582 error)); 1583 } 1584 1585 if (rt != NULL) { 1586 if (rt->rt_refcnt <= 0) { 1587 /* XXX: we should free the entry ourselves. */ 1588 rtref(rt); 1589 rtfree(rt); 1590 } 1591 } 1592 1593 return(error); 1594 } 1595 1596 static struct in6_ifaddr * 1597 in6_ifadd(pr, ifid) 1598 struct nd_prefix *pr; 1599 struct in6_addr *ifid; /* Mobile IPv6 addition */ 1600 { 1601 struct ifnet *ifp = pr->ndpr_ifp; 1602 struct ifaddr *ifa; 1603 struct in6_aliasreq ifra; 1604 struct in6_ifaddr *ia, *ib; 1605 int error, plen0; 1606 struct in6_addr mask; 1607 int prefixlen = pr->ndpr_plen; 1608 1609 in6_len2mask(&mask, prefixlen); 1610 1611 /* 1612 * find a link-local address (will be interface ID). 1613 * Is it really mandatory? Theoretically, a global or a site-local 1614 * address can be configured without a link-local address, if we 1615 * have a unique interface identifier... 1616 * 1617 * it is not mandatory to have a link-local address, we can generate 1618 * interface identifier on the fly. we do this because: 1619 * (1) it should be the easiest way to find interface identifier. 1620 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1621 * for multiple addresses on a single interface, and possible shortcut 1622 * of DAD. we omitted DAD for this reason in the past. 1623 * (3) a user can prevent autoconfiguration of global address 1624 * by removing link-local address by hand (this is partly because we 1625 * don't have other way to control the use of IPv6 on a interface. 1626 * this has been our design choice - cf. NRL's "ifconfig auto"). 1627 * (4) it is easier to manage when an interface has addresses 1628 * with the same interface identifier, than to have multiple addresses 1629 * with different interface identifiers. 1630 * 1631 * Mobile IPv6 addition: allow for caller to specify a wished interface 1632 * ID. This is to not break connections when moving addresses between 1633 * interfaces. 1634 */ 1635 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1636 if (ifa) 1637 ib = (struct in6_ifaddr *)ifa; 1638 else 1639 return NULL; 1640 1641 #if 0 /* don't care link local addr state, and always do DAD */ 1642 /* if link-local address is not eligible, do not autoconfigure. */ 1643 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1644 printf("in6_ifadd: link-local address not ready\n"); 1645 return NULL; 1646 } 1647 #endif 1648 1649 /* prefixlen + ifidlen must be equal to 128 */ 1650 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1651 if (prefixlen != plen0) { 1652 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1653 "(prefix=%d ifid=%d)\n", 1654 if_name(ifp), prefixlen, 128 - plen0)); 1655 return NULL; 1656 } 1657 1658 /* make ifaddr */ 1659 1660 bzero(&ifra, sizeof(ifra)); 1661 /* 1662 * in6_update_ifa() does not use ifra_name, but we accurately set it 1663 * for safety. 1664 */ 1665 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1666 ifra.ifra_addr.sin6_family = AF_INET6; 1667 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1668 /* prefix */ 1669 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1670 sizeof(ifra.ifra_addr.sin6_addr)); 1671 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1672 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1673 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1674 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1675 1676 /* interface ID */ 1677 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1678 ifid = &ib->ia_addr.sin6_addr; 1679 ifra.ifra_addr.sin6_addr.s6_addr32[0] 1680 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1681 ifra.ifra_addr.sin6_addr.s6_addr32[1] 1682 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1683 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1684 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1685 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1686 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1687 1688 /* new prefix mask. */ 1689 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1690 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1691 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1692 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1693 1694 /* 1695 * lifetime. 1696 * XXX: in6_init_address_ltimes would override these values later. 1697 * We should reconsider this logic. 1698 */ 1699 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1700 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1701 1702 /* XXX: scope zone ID? */ 1703 1704 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1705 /* 1706 * temporarily set the nopfx flag to avoid conflict. 1707 * XXX: we should reconsider the entire mechanism about prefix 1708 * manipulation. 1709 */ 1710 ifra.ifra_flags |= IN6_IFF_NOPFX; 1711 1712 /* 1713 * keep the new address, regardless of the result of in6_update_ifa. 1714 * XXX: this address is now meaningless. 1715 * We should reconsider its role. 1716 */ 1717 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1718 1719 /* allocate ifaddr structure, link into chain, etc. */ 1720 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1721 nd6log((LOG_ERR, 1722 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1723 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1724 error)); 1725 return(NULL); /* ifaddr must not have been allocated. */ 1726 } 1727 1728 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1729 1730 in6_post_msg(ifp, KEV_INET6_NEW_RTADV_ADDR, ia); 1731 1732 return(ia); /* this must NOT be NULL. */ 1733 } 1734 1735 int 1736 in6_tmpifadd(ia0, forcegen) 1737 const struct in6_ifaddr *ia0; /* corresponding public address */ 1738 int forcegen; 1739 { 1740 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1741 struct in6_ifaddr *newia; 1742 struct in6_aliasreq ifra; 1743 int i, error; 1744 int trylimit = 3; /* XXX: adhoc value */ 1745 u_int32_t randid[2]; 1746 time_t vltime0, pltime0; 1747 1748 bzero(&ifra, sizeof(ifra)); 1749 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1750 ifra.ifra_addr = ia0->ia_addr; 1751 /* copy prefix mask */ 1752 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1753 /* clear the old IFID */ 1754 for (i = 0; i < 4; i++) { 1755 ifra.ifra_addr.sin6_addr.s6_addr32[i] 1756 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1757 } 1758 1759 again: 1760 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1761 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], 1762 forcegen); 1763 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1764 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1765 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1766 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1767 1768 /* 1769 * If by chance the new temporary address is the same as an address 1770 * already assigned to the interface, generate a new randomized 1771 * interface identifier and repeat this step. 1772 * RFC 3041 3.3 (4). 1773 */ 1774 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1775 if (trylimit-- == 0) { 1776 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1777 "a unique random IFID\n")); 1778 return(EEXIST); 1779 } 1780 forcegen = 1; 1781 goto again; 1782 } 1783 1784 /* 1785 * The Valid Lifetime is the lower of the Valid Lifetime of the 1786 * public address or TEMP_VALID_LIFETIME. 1787 * The Preferred Lifetime is the lower of the Preferred Lifetime 1788 * of the public address or TEMP_PREFERRED_LIFETIME - 1789 * DESYNC_FACTOR. 1790 */ 1791 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1792 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1793 (ia0->ia6_lifetime.ia6t_expire - time_second); 1794 if (vltime0 > ip6_temp_valid_lifetime) 1795 vltime0 = ip6_temp_valid_lifetime; 1796 } else 1797 vltime0 = ip6_temp_valid_lifetime; 1798 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1799 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1800 (ia0->ia6_lifetime.ia6t_preferred - time_second); 1801 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){ 1802 pltime0 = ip6_temp_preferred_lifetime - 1803 ip6_desync_factor; 1804 } 1805 } else 1806 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1807 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1808 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1809 1810 /* 1811 * A temporary address is created only if this calculated Preferred 1812 * Lifetime is greater than REGEN_ADVANCE time units. 1813 */ 1814 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1815 return(0); 1816 1817 /* XXX: scope zone ID? */ 1818 1819 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1820 1821 /* allocate ifaddr structure, link into chain, etc. */ 1822 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1823 return(error); 1824 1825 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1826 if (newia == NULL) { /* XXX: can it happen? */ 1827 nd6log((LOG_ERR, 1828 "in6_tmpifadd: ifa update succeeded, but we got " 1829 "no ifaddr\n")); 1830 return(EINVAL); /* XXX */ 1831 } 1832 newia->ia6_ndpr = ia0->ia6_ndpr; 1833 newia->ia6_ndpr->ndpr_refcnt++; 1834 1835 /* 1836 * A newly added address might affect the status of other addresses. 1837 * XXX: when the temporary address is generated with a new public 1838 * address, the onlink check is redundant. However, it would be safe 1839 * to do the check explicitly everywhere a new address is generated, 1840 * and, in fact, we surely need the check when we create a new 1841 * temporary address due to deprecation of an old temporary address. 1842 */ 1843 pfxlist_onlink_check(); 1844 1845 return(0); 1846 } 1847 1848 int 1849 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1850 { 1851 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1852 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1853 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1854 "(%d) is greater than valid lifetime(%d)\n", 1855 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1856 return (EINVAL); 1857 } 1858 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1859 ndpr->ndpr_preferred = 0; 1860 else 1861 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1862 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1863 ndpr->ndpr_expire = 0; 1864 else 1865 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1866 1867 return 0; 1868 } 1869 1870 static void 1871 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1872 { 1873 /* Valid lifetime must not be updated unless explicitly specified. */ 1874 /* init ia6t_expire */ 1875 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1876 lt6->ia6t_expire = 0; 1877 else { 1878 lt6->ia6t_expire = time_second; 1879 lt6->ia6t_expire += lt6->ia6t_vltime; 1880 } 1881 1882 /* init ia6t_preferred */ 1883 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1884 lt6->ia6t_preferred = 0; 1885 else { 1886 lt6->ia6t_preferred = time_second; 1887 lt6->ia6t_preferred += lt6->ia6t_pltime; 1888 } 1889 } 1890 1891 /* 1892 * Delete all the routing table entries that use the specified gateway. 1893 * XXX: this function causes search through all entries of routing table, so 1894 * it shouldn't be called when acting as a router. 1895 */ 1896 void 1897 rt6_flush(gateway, ifp) 1898 struct in6_addr *gateway; 1899 struct ifnet *ifp; 1900 { 1901 struct radix_node_head *rnh = rt_tables[AF_INET6]; 1902 int s = splnet(); 1903 1904 /* We'll care only link-local addresses */ 1905 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 1906 splx(s); 1907 return; 1908 } 1909 /* XXX: hack for KAME's link-local address kludge */ 1910 gateway->s6_addr16[1] = htons(ifp->if_index); 1911 1912 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1913 splx(s); 1914 } 1915 1916 static int 1917 rt6_deleteroute(rn, arg) 1918 struct radix_node *rn; 1919 void *arg; 1920 { 1921 #define SIN6(s) ((struct sockaddr_in6 *)s) 1922 struct rtentry *rt = (struct rtentry *)rn; 1923 struct in6_addr *gate = (struct in6_addr *)arg; 1924 1925 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1926 return(0); 1927 1928 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1929 return(0); 1930 1931 /* 1932 * Do not delete a static route. 1933 * XXX: this seems to be a bit ad-hoc. Should we consider the 1934 * 'cloned' bit instead? 1935 */ 1936 if ((rt->rt_flags & RTF_STATIC) != 0) 1937 return(0); 1938 1939 /* 1940 * We delete only host route. This means, in particular, we don't 1941 * delete default route. 1942 */ 1943 if ((rt->rt_flags & RTF_HOST) == 0) 1944 return(0); 1945 1946 return(rtrequest(RTM_DELETE, rt_key(rt), 1947 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1948 #undef SIN6 1949 } 1950 1951 int 1952 nd6_setdefaultiface(ifindex) 1953 int ifindex; 1954 { 1955 int error = 0; 1956 1957 if (ifindex < 0 || if_index < ifindex) 1958 return(EINVAL); 1959 1960 if (nd6_defifindex != ifindex) { 1961 nd6_defifindex = ifindex; 1962 if (nd6_defifindex > 0) 1963 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1964 else 1965 nd6_defifp = NULL; 1966 1967 /* 1968 * If the Default Router List is empty, install a route 1969 * to the specified interface as default or remove the default 1970 * route when the default interface becomes canceled. 1971 * The check for the queue is actually redundant, but 1972 * we do this here to avoid re-install the default route 1973 * if the list is NOT empty. 1974 */ 1975 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1976 defrouter_select(); 1977 1978 /* 1979 * Our current implementation assumes one-to-one maping between 1980 * interfaces and links, so it would be natural to use the 1981 * default interface as the default link. 1982 */ 1983 scope6_setdefault(nd6_defifp); 1984 } 1985 1986 return(error); 1987 }
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