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sys/netinet6/nd6_rtr.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/8.0/sys/netinet6/nd6_rtr.c 196674 2009-08-30 22:44:12Z qingli $"); 34 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/socket.h> 43 #include <sys/sockio.h> 44 #include <sys/time.h> 45 #include <sys/kernel.h> 46 #include <sys/lock.h> 47 #include <sys/errno.h> 48 #include <sys/rwlock.h> 49 #include <sys/syslog.h> 50 #include <sys/queue.h> 51 52 #include <net/if.h> 53 #include <net/if_types.h> 54 #include <net/if_dl.h> 55 #include <net/route.h> 56 #include <net/radix.h> 57 #include <net/vnet.h> 58 59 #include <netinet/in.h> 60 #include <net/if_llatbl.h> 61 #include <netinet6/in6_var.h> 62 #include <netinet6/in6_ifattach.h> 63 #include <netinet/ip6.h> 64 #include <netinet6/ip6_var.h> 65 #include <netinet6/nd6.h> 66 #include <netinet/icmp6.h> 67 #include <netinet6/scope6_var.h> 68 69 static int rtpref(struct nd_defrouter *); 70 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *); 71 static int prelist_update __P((struct nd_prefixctl *, struct nd_defrouter *, 72 struct mbuf *, int)); 73 static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int); 74 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *, 75 struct nd_defrouter *)); 76 static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *); 77 static void pfxrtr_del(struct nd_pfxrouter *); 78 static struct nd_pfxrouter *find_pfxlist_reachable_router 79 (struct nd_prefix *); 80 static void defrouter_delreq(struct nd_defrouter *); 81 static void nd6_rtmsg(int, struct rtentry *); 82 83 static int in6_init_prefix_ltimes(struct nd_prefix *); 84 static void in6_init_address_ltimes __P((struct nd_prefix *, 85 struct in6_addrlifetime *)); 86 87 static int rt6_deleteroute(struct radix_node *, void *); 88 89 VNET_DECLARE(int, nd6_recalc_reachtm_interval); 90 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval) 91 92 static VNET_DEFINE(struct ifnet *, nd6_defifp); 93 #define V_nd6_defifp VNET(nd6_defifp) 94 95 VNET_DEFINE(int, nd6_defifindex); 96 VNET_DEFINE(int, ip6_use_tempaddr); 97 VNET_DEFINE(int, ip6_desync_factor); 98 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime); 99 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime); 100 VNET_DEFINE(int, ip6_temp_regen_advance); 101 102 /* RTPREF_MEDIUM has to be 0! */ 103 #define RTPREF_HIGH 1 104 #define RTPREF_MEDIUM 0 105 #define RTPREF_LOW (-1) 106 #define RTPREF_RESERVED (-2) 107 #define RTPREF_INVALID (-3) /* internal */ 108 109 /* 110 * Receive Router Solicitation Message - just for routers. 111 * Router solicitation/advertisement is mostly managed by userland program 112 * (rtadvd) so here we have no function like nd6_ra_output(). 113 * 114 * Based on RFC 2461 115 */ 116 void 117 nd6_rs_input(struct mbuf *m, int off, int icmp6len) 118 { 119 struct ifnet *ifp = m->m_pkthdr.rcvif; 120 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 121 struct nd_router_solicit *nd_rs; 122 struct in6_addr saddr6 = ip6->ip6_src; 123 char *lladdr = NULL; 124 int lladdrlen = 0; 125 union nd_opts ndopts; 126 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 127 128 /* If I'm not a router, ignore it. */ 129 if (V_ip6_accept_rtadv != 0 || V_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(ip6bufs, &ip6->ip6_src), 137 ip6_sprintf(ip6bufd, &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_INC(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(ip6bufs, &saddr6), 178 ifp->if_addrlen, lladdrlen - 2)); 179 goto bad; 180 } 181 182 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 183 184 freeit: 185 m_freem(m); 186 return; 187 188 bad: 189 ICMP6STAT_INC(icp6s_badrs); 190 m_freem(m); 191 } 192 193 /* 194 * Receive Router Advertisement Message. 195 * 196 * Based on RFC 2461 197 * TODO: on-link bit on prefix information 198 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 199 */ 200 void 201 nd6_ra_input(struct mbuf *m, int off, int icmp6len) 202 { 203 struct ifnet *ifp = m->m_pkthdr.rcvif; 204 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 205 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 206 struct nd_router_advert *nd_ra; 207 struct in6_addr saddr6 = ip6->ip6_src; 208 int mcast = 0; 209 union nd_opts ndopts; 210 struct nd_defrouter *dr; 211 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 212 213 /* 214 * We only accept RAs only when 215 * the system-wide variable allows the acceptance, and 216 * per-interface variable allows RAs on the receiving interface. 217 */ 218 if (V_ip6_accept_rtadv == 0) 219 goto freeit; 220 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 221 goto freeit; 222 223 if (ip6->ip6_hlim != 255) { 224 nd6log((LOG_ERR, 225 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 226 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 227 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 228 goto bad; 229 } 230 231 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 232 nd6log((LOG_ERR, 233 "nd6_ra_input: src %s is not link-local\n", 234 ip6_sprintf(ip6bufs, &saddr6))); 235 goto bad; 236 } 237 238 #ifndef PULLDOWN_TEST 239 IP6_EXTHDR_CHECK(m, off, icmp6len,); 240 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 241 #else 242 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 243 if (nd_ra == NULL) { 244 ICMP6STAT_INC(icp6s_tooshort); 245 return; 246 } 247 #endif 248 249 icmp6len -= sizeof(*nd_ra); 250 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 251 if (nd6_options(&ndopts) < 0) { 252 nd6log((LOG_INFO, 253 "nd6_ra_input: invalid ND option, ignored\n")); 254 /* nd6_options have incremented stats */ 255 goto freeit; 256 } 257 258 { 259 struct nd_defrouter dr0; 260 u_int32_t advreachable = nd_ra->nd_ra_reachable; 261 262 /* remember if this is a multicasted advertisement */ 263 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 264 mcast = 1; 265 266 bzero(&dr0, sizeof(dr0)); 267 dr0.rtaddr = saddr6; 268 dr0.flags = nd_ra->nd_ra_flags_reserved; 269 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 270 dr0.expire = time_second + dr0.rtlifetime; 271 dr0.ifp = ifp; 272 /* unspecified or not? (RFC 2461 6.3.4) */ 273 if (advreachable) { 274 advreachable = ntohl(advreachable); 275 if (advreachable <= MAX_REACHABLE_TIME && 276 ndi->basereachable != advreachable) { 277 ndi->basereachable = advreachable; 278 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 279 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */ 280 } 281 } 282 if (nd_ra->nd_ra_retransmit) 283 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 284 if (nd_ra->nd_ra_curhoplimit) 285 ndi->chlim = nd_ra->nd_ra_curhoplimit; 286 dr = defrtrlist_update(&dr0); 287 } 288 289 /* 290 * prefix 291 */ 292 if (ndopts.nd_opts_pi) { 293 struct nd_opt_hdr *pt; 294 struct nd_opt_prefix_info *pi = NULL; 295 struct nd_prefixctl pr; 296 297 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 298 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 299 pt = (struct nd_opt_hdr *)((caddr_t)pt + 300 (pt->nd_opt_len << 3))) { 301 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 302 continue; 303 pi = (struct nd_opt_prefix_info *)pt; 304 305 if (pi->nd_opt_pi_len != 4) { 306 nd6log((LOG_INFO, 307 "nd6_ra_input: invalid option " 308 "len %d for prefix information option, " 309 "ignored\n", pi->nd_opt_pi_len)); 310 continue; 311 } 312 313 if (128 < pi->nd_opt_pi_prefix_len) { 314 nd6log((LOG_INFO, 315 "nd6_ra_input: invalid prefix " 316 "len %d for prefix information option, " 317 "ignored\n", pi->nd_opt_pi_prefix_len)); 318 continue; 319 } 320 321 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 322 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 323 nd6log((LOG_INFO, 324 "nd6_ra_input: invalid prefix " 325 "%s, ignored\n", 326 ip6_sprintf(ip6bufs, 327 &pi->nd_opt_pi_prefix))); 328 continue; 329 } 330 331 bzero(&pr, sizeof(pr)); 332 pr.ndpr_prefix.sin6_family = AF_INET6; 333 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 334 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 335 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 336 337 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 338 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 339 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 340 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 341 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 342 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 343 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); 344 (void)prelist_update(&pr, dr, m, mcast); 345 } 346 } 347 348 /* 349 * MTU 350 */ 351 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 352 u_long mtu; 353 u_long maxmtu; 354 355 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 356 357 /* lower bound */ 358 if (mtu < IPV6_MMTU) { 359 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 360 "mtu=%lu sent from %s, ignoring\n", 361 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src))); 362 goto skip; 363 } 364 365 /* upper bound */ 366 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) 367 ? ndi->maxmtu : ifp->if_mtu; 368 if (mtu <= maxmtu) { 369 int change = (ndi->linkmtu != mtu); 370 371 ndi->linkmtu = mtu; 372 if (change) /* in6_maxmtu may change */ 373 in6_setmaxmtu(); 374 } else { 375 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 376 "mtu=%lu sent from %s; " 377 "exceeds maxmtu %lu, ignoring\n", 378 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu)); 379 } 380 } 381 382 skip: 383 384 /* 385 * Source link layer address 386 */ 387 { 388 char *lladdr = NULL; 389 int lladdrlen = 0; 390 391 if (ndopts.nd_opts_src_lladdr) { 392 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 393 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 394 } 395 396 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 397 nd6log((LOG_INFO, 398 "nd6_ra_input: lladdrlen mismatch for %s " 399 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6), 400 ifp->if_addrlen, lladdrlen - 2)); 401 goto bad; 402 } 403 404 nd6_cache_lladdr(ifp, &saddr6, lladdr, 405 lladdrlen, ND_ROUTER_ADVERT, 0); 406 407 /* 408 * Installing a link-layer address might change the state of the 409 * router's neighbor cache, which might also affect our on-link 410 * detection of adveritsed prefixes. 411 */ 412 pfxlist_onlink_check(); 413 } 414 415 freeit: 416 m_freem(m); 417 return; 418 419 bad: 420 ICMP6STAT_INC(icp6s_badra); 421 m_freem(m); 422 } 423 424 /* 425 * default router list proccessing sub routines 426 */ 427 428 /* tell the change to user processes watching the routing socket. */ 429 static void 430 nd6_rtmsg(int cmd, struct rtentry *rt) 431 { 432 struct rt_addrinfo info; 433 struct ifnet *ifp; 434 struct ifaddr *ifa; 435 436 bzero((caddr_t)&info, sizeof(info)); 437 info.rti_info[RTAX_DST] = rt_key(rt); 438 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 439 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 440 ifp = rt->rt_ifp; 441 if (ifp != NULL) { 442 IF_ADDR_LOCK(ifp); 443 ifa = TAILQ_FIRST(&ifp->if_addrhead); 444 info.rti_info[RTAX_IFP] = ifa->ifa_addr; 445 ifa_ref(ifa); 446 IF_ADDR_UNLOCK(ifp); 447 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 448 } else 449 ifa = NULL; 450 451 rt_missmsg(cmd, &info, rt->rt_flags, 0); 452 if (ifa != NULL) 453 ifa_free(ifa); 454 } 455 456 void 457 defrouter_addreq(struct nd_defrouter *new) 458 { 459 struct sockaddr_in6 def, mask, gate; 460 struct rtentry *newrt = NULL; 461 int s; 462 int error; 463 464 bzero(&def, sizeof(def)); 465 bzero(&mask, sizeof(mask)); 466 bzero(&gate, sizeof(gate)); 467 468 def.sin6_len = mask.sin6_len = gate.sin6_len = 469 sizeof(struct sockaddr_in6); 470 def.sin6_family = gate.sin6_family = AF_INET6; 471 gate.sin6_addr = new->rtaddr; 472 473 s = splnet(); 474 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, 475 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 476 RTF_GATEWAY, &newrt); 477 if (newrt) { 478 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 479 RTFREE(newrt); 480 } 481 if (error == 0) 482 new->installed = 1; 483 splx(s); 484 return; 485 } 486 487 struct nd_defrouter * 488 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) 489 { 490 struct nd_defrouter *dr; 491 492 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr; 493 dr = TAILQ_NEXT(dr, dr_entry)) { 494 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 495 return (dr); 496 } 497 498 return (NULL); /* search failed */ 499 } 500 501 /* 502 * Remove the default route for a given router. 503 * This is just a subroutine function for defrouter_select(), and should 504 * not be called from anywhere else. 505 */ 506 static void 507 defrouter_delreq(struct nd_defrouter *dr) 508 { 509 struct sockaddr_in6 def, mask, gate; 510 struct rtentry *oldrt = NULL; 511 512 bzero(&def, sizeof(def)); 513 bzero(&mask, sizeof(mask)); 514 bzero(&gate, sizeof(gate)); 515 516 def.sin6_len = mask.sin6_len = gate.sin6_len = 517 sizeof(struct sockaddr_in6); 518 def.sin6_family = gate.sin6_family = AF_INET6; 519 gate.sin6_addr = dr->rtaddr; 520 521 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 522 (struct sockaddr *)&gate, 523 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt); 524 if (oldrt) { 525 nd6_rtmsg(RTM_DELETE, oldrt); 526 RTFREE(oldrt); 527 } 528 529 dr->installed = 0; 530 } 531 532 /* 533 * remove all default routes from default router list 534 */ 535 void 536 defrouter_reset(void) 537 { 538 struct nd_defrouter *dr; 539 540 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr; 541 dr = TAILQ_NEXT(dr, dr_entry)) 542 defrouter_delreq(dr); 543 544 /* 545 * XXX should we also nuke any default routers in the kernel, by 546 * going through them by rtalloc1()? 547 */ 548 } 549 550 void 551 defrtrlist_del(struct nd_defrouter *dr) 552 { 553 struct nd_defrouter *deldr = NULL; 554 struct nd_prefix *pr; 555 556 /* 557 * Flush all the routing table entries that use the router 558 * as a next hop. 559 */ 560 if (!V_ip6_forwarding && V_ip6_accept_rtadv) /* XXX: better condition? */ 561 rt6_flush(&dr->rtaddr, dr->ifp); 562 563 if (dr->installed) { 564 deldr = dr; 565 defrouter_delreq(dr); 566 } 567 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry); 568 569 /* 570 * Also delete all the pointers to the router in each prefix lists. 571 */ 572 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 573 struct nd_pfxrouter *pfxrtr; 574 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 575 pfxrtr_del(pfxrtr); 576 } 577 pfxlist_onlink_check(); 578 579 /* 580 * If the router is the primary one, choose a new one. 581 * Note that defrouter_select() will remove the current gateway 582 * from the routing table. 583 */ 584 if (deldr) 585 defrouter_select(); 586 587 free(dr, M_IP6NDP); 588 } 589 590 /* 591 * Default Router Selection according to Section 6.3.6 of RFC 2461 and 592 * draft-ietf-ipngwg-router-selection: 593 * 1) Routers that are reachable or probably reachable should be preferred. 594 * If we have more than one (probably) reachable router, prefer ones 595 * with the highest router preference. 596 * 2) When no routers on the list are known to be reachable or 597 * probably reachable, routers SHOULD be selected in a round-robin 598 * fashion, regardless of router preference values. 599 * 3) If the Default Router List is empty, assume that all 600 * destinations are on-link. 601 * 602 * We assume nd_defrouter is sorted by router preference value. 603 * Since the code below covers both with and without router preference cases, 604 * we do not need to classify the cases by ifdef. 605 * 606 * At this moment, we do not try to install more than one default router, 607 * even when the multipath routing is available, because we're not sure about 608 * the benefits for stub hosts comparing to the risk of making the code 609 * complicated and the possibility of introducing bugs. 610 */ 611 void 612 defrouter_select(void) 613 { 614 int s = splnet(); 615 struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL; 616 struct llentry *ln = NULL; 617 618 /* 619 * This function should be called only when acting as an autoconfigured 620 * host. Although the remaining part of this function is not effective 621 * if the node is not an autoconfigured host, we explicitly exclude 622 * such cases here for safety. 623 */ 624 if (V_ip6_forwarding || !V_ip6_accept_rtadv) { 625 nd6log((LOG_WARNING, 626 "defrouter_select: called unexpectedly (forwarding=%d, " 627 "accept_rtadv=%d)\n", V_ip6_forwarding, V_ip6_accept_rtadv)); 628 splx(s); 629 return; 630 } 631 632 /* 633 * Let's handle easy case (3) first: 634 * If default router list is empty, there's nothing to be done. 635 */ 636 if (!TAILQ_FIRST(&V_nd_defrouter)) { 637 splx(s); 638 return; 639 } 640 641 /* 642 * Search for a (probably) reachable router from the list. 643 * We just pick up the first reachable one (if any), assuming that 644 * the ordering rule of the list described in defrtrlist_update(). 645 */ 646 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr; 647 dr = TAILQ_NEXT(dr, dr_entry)) { 648 IF_AFDATA_LOCK(dr->ifp); 649 if (selected_dr == NULL && 650 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 651 ND6_IS_LLINFO_PROBREACH(ln)) { 652 selected_dr = dr; 653 } 654 IF_AFDATA_UNLOCK(dr->ifp); 655 if (ln != NULL) { 656 LLE_RUNLOCK(ln); 657 ln = NULL; 658 } 659 660 if (dr->installed && installed_dr == NULL) 661 installed_dr = dr; 662 else if (dr->installed && installed_dr) { 663 /* this should not happen. warn for diagnosis. */ 664 log(LOG_ERR, "defrouter_select: more than one router" 665 " is installed\n"); 666 } 667 } 668 /* 669 * If none of the default routers was found to be reachable, 670 * round-robin the list regardless of preference. 671 * Otherwise, if we have an installed router, check if the selected 672 * (reachable) router should really be preferred to the installed one. 673 * We only prefer the new router when the old one is not reachable 674 * or when the new one has a really higher preference value. 675 */ 676 if (selected_dr == NULL) { 677 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry)) 678 selected_dr = TAILQ_FIRST(&V_nd_defrouter); 679 else 680 selected_dr = TAILQ_NEXT(installed_dr, dr_entry); 681 } else if (installed_dr) { 682 IF_AFDATA_LOCK(installed_dr->ifp); 683 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) && 684 ND6_IS_LLINFO_PROBREACH(ln) && 685 rtpref(selected_dr) <= rtpref(installed_dr)) { 686 selected_dr = installed_dr; 687 } 688 IF_AFDATA_UNLOCK(installed_dr->ifp); 689 if (ln != NULL) 690 LLE_RUNLOCK(ln); 691 } 692 693 /* 694 * If the selected router is different than the installed one, 695 * remove the installed router and install the selected one. 696 * Note that the selected router is never NULL here. 697 */ 698 if (installed_dr != selected_dr) { 699 if (installed_dr) 700 defrouter_delreq(installed_dr); 701 defrouter_addreq(selected_dr); 702 } 703 704 splx(s); 705 return; 706 } 707 708 /* 709 * for default router selection 710 * regards router-preference field as a 2-bit signed integer 711 */ 712 static int 713 rtpref(struct nd_defrouter *dr) 714 { 715 switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) { 716 case ND_RA_FLAG_RTPREF_HIGH: 717 return (RTPREF_HIGH); 718 case ND_RA_FLAG_RTPREF_MEDIUM: 719 case ND_RA_FLAG_RTPREF_RSV: 720 return (RTPREF_MEDIUM); 721 case ND_RA_FLAG_RTPREF_LOW: 722 return (RTPREF_LOW); 723 default: 724 /* 725 * This case should never happen. If it did, it would mean a 726 * serious bug of kernel internal. We thus always bark here. 727 * Or, can we even panic? 728 */ 729 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags); 730 return (RTPREF_INVALID); 731 } 732 /* NOTREACHED */ 733 } 734 735 static struct nd_defrouter * 736 defrtrlist_update(struct nd_defrouter *new) 737 { 738 struct nd_defrouter *dr, *n; 739 int s = splnet(); 740 741 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 742 /* entry exists */ 743 if (new->rtlifetime == 0) { 744 defrtrlist_del(dr); 745 dr = NULL; 746 } else { 747 int oldpref = rtpref(dr); 748 749 /* override */ 750 dr->flags = new->flags; /* xxx flag check */ 751 dr->rtlifetime = new->rtlifetime; 752 dr->expire = new->expire; 753 754 /* 755 * If the preference does not change, there's no need 756 * to sort the entries. 757 */ 758 if (rtpref(new) == oldpref) { 759 splx(s); 760 return (dr); 761 } 762 763 /* 764 * preferred router may be changed, so relocate 765 * this router. 766 * XXX: calling TAILQ_REMOVE directly is a bad manner. 767 * However, since defrtrlist_del() has many side 768 * effects, we intentionally do so here. 769 * defrouter_select() below will handle routing 770 * changes later. 771 */ 772 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry); 773 n = dr; 774 goto insert; 775 } 776 splx(s); 777 return (dr); 778 } 779 780 /* entry does not exist */ 781 if (new->rtlifetime == 0) { 782 splx(s); 783 return (NULL); 784 } 785 786 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 787 if (n == NULL) { 788 splx(s); 789 return (NULL); 790 } 791 bzero(n, sizeof(*n)); 792 *n = *new; 793 794 insert: 795 /* 796 * Insert the new router in the Default Router List; 797 * The Default Router List should be in the descending order 798 * of router-preferece. Routers with the same preference are 799 * sorted in the arriving time order. 800 */ 801 802 /* insert at the end of the group */ 803 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr; 804 dr = TAILQ_NEXT(dr, dr_entry)) { 805 if (rtpref(n) > rtpref(dr)) 806 break; 807 } 808 if (dr) 809 TAILQ_INSERT_BEFORE(dr, n, dr_entry); 810 else 811 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry); 812 813 defrouter_select(); 814 815 splx(s); 816 817 return (n); 818 } 819 820 static struct nd_pfxrouter * 821 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 822 { 823 struct nd_pfxrouter *search; 824 825 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 826 if (search->router == dr) 827 break; 828 } 829 830 return (search); 831 } 832 833 static void 834 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 835 { 836 struct nd_pfxrouter *new; 837 838 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 839 if (new == NULL) 840 return; 841 bzero(new, sizeof(*new)); 842 new->router = dr; 843 844 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 845 846 pfxlist_onlink_check(); 847 } 848 849 static void 850 pfxrtr_del(struct nd_pfxrouter *pfr) 851 { 852 LIST_REMOVE(pfr, pfr_entry); 853 free(pfr, M_IP6NDP); 854 } 855 856 struct nd_prefix * 857 nd6_prefix_lookup(struct nd_prefixctl *key) 858 { 859 struct nd_prefix *search; 860 861 for (search = V_nd_prefix.lh_first; 862 search; search = search->ndpr_next) { 863 if (key->ndpr_ifp == search->ndpr_ifp && 864 key->ndpr_plen == search->ndpr_plen && 865 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr, 866 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) { 867 break; 868 } 869 } 870 871 return (search); 872 } 873 874 int 875 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr, 876 struct nd_prefix **newp) 877 { 878 struct nd_prefix *new = NULL; 879 int error = 0; 880 int i, s; 881 char ip6buf[INET6_ADDRSTRLEN]; 882 883 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 884 if (new == NULL) 885 return(ENOMEM); 886 bzero(new, sizeof(*new)); 887 new->ndpr_ifp = pr->ndpr_ifp; 888 new->ndpr_prefix = pr->ndpr_prefix; 889 new->ndpr_plen = pr->ndpr_plen; 890 new->ndpr_vltime = pr->ndpr_vltime; 891 new->ndpr_pltime = pr->ndpr_pltime; 892 new->ndpr_flags = pr->ndpr_flags; 893 if ((error = in6_init_prefix_ltimes(new)) != 0) { 894 free(new, M_IP6NDP); 895 return(error); 896 } 897 new->ndpr_lastupdate = time_second; 898 if (newp != NULL) 899 *newp = new; 900 901 /* initialization */ 902 LIST_INIT(&new->ndpr_advrtrs); 903 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 904 /* make prefix in the canonical form */ 905 for (i = 0; i < 4; i++) 906 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 907 new->ndpr_mask.s6_addr32[i]; 908 909 s = splnet(); 910 /* link ndpr_entry to nd_prefix list */ 911 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry); 912 splx(s); 913 914 /* ND_OPT_PI_FLAG_ONLINK processing */ 915 if (new->ndpr_raf_onlink) { 916 int e; 917 918 if ((e = nd6_prefix_onlink(new)) != 0) { 919 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 920 "the prefix %s/%d on-link on %s (errno=%d)\n", 921 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 922 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 923 /* proceed anyway. XXX: is it correct? */ 924 } 925 } 926 927 if (dr) 928 pfxrtr_add(new, dr); 929 930 return 0; 931 } 932 933 void 934 prelist_remove(struct nd_prefix *pr) 935 { 936 struct nd_pfxrouter *pfr, *next; 937 int e, s; 938 char ip6buf[INET6_ADDRSTRLEN]; 939 940 /* make sure to invalidate the prefix until it is really freed. */ 941 pr->ndpr_vltime = 0; 942 pr->ndpr_pltime = 0; 943 944 /* 945 * Though these flags are now meaningless, we'd rather keep the value 946 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users 947 * when executing "ndp -p". 948 */ 949 950 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && 951 (e = nd6_prefix_offlink(pr)) != 0) { 952 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 953 "on %s, errno=%d\n", 954 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 955 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 956 /* what should we do? */ 957 } 958 959 if (pr->ndpr_refcnt > 0) 960 return; /* notice here? */ 961 962 s = splnet(); 963 964 /* unlink ndpr_entry from nd_prefix list */ 965 LIST_REMOVE(pr, ndpr_entry); 966 967 /* free list of routers that adversed the prefix */ 968 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 969 next = pfr->pfr_next; 970 971 free(pfr, M_IP6NDP); 972 } 973 splx(s); 974 975 free(pr, M_IP6NDP); 976 977 pfxlist_onlink_check(); 978 } 979 980 /* 981 * dr - may be NULL 982 */ 983 984 static int 985 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr, 986 struct mbuf *m, int mcast) 987 { 988 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 989 struct ifaddr *ifa; 990 struct ifnet *ifp = new->ndpr_ifp; 991 struct nd_prefix *pr; 992 int s = splnet(); 993 int error = 0; 994 int newprefix = 0; 995 int auth; 996 struct in6_addrlifetime lt6_tmp; 997 char ip6buf[INET6_ADDRSTRLEN]; 998 999 auth = 0; 1000 if (m) { 1001 /* 1002 * Authenticity for NA consists authentication for 1003 * both IP header and IP datagrams, doesn't it ? 1004 */ 1005 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 1006 auth = ((m->m_flags & M_AUTHIPHDR) && 1007 (m->m_flags & M_AUTHIPDGM)); 1008 #endif 1009 } 1010 1011 if ((pr = nd6_prefix_lookup(new)) != NULL) { 1012 /* 1013 * nd6_prefix_lookup() ensures that pr and new have the same 1014 * prefix on a same interface. 1015 */ 1016 1017 /* 1018 * Update prefix information. Note that the on-link (L) bit 1019 * and the autonomous (A) bit should NOT be changed from 1 1020 * to 0. 1021 */ 1022 if (new->ndpr_raf_onlink == 1) 1023 pr->ndpr_raf_onlink = 1; 1024 if (new->ndpr_raf_auto == 1) 1025 pr->ndpr_raf_auto = 1; 1026 if (new->ndpr_raf_onlink) { 1027 pr->ndpr_vltime = new->ndpr_vltime; 1028 pr->ndpr_pltime = new->ndpr_pltime; 1029 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */ 1030 pr->ndpr_lastupdate = time_second; 1031 } 1032 1033 if (new->ndpr_raf_onlink && 1034 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1035 int e; 1036 1037 if ((e = nd6_prefix_onlink(pr)) != 0) { 1038 nd6log((LOG_ERR, 1039 "prelist_update: failed to make " 1040 "the prefix %s/%d on-link on %s " 1041 "(errno=%d)\n", 1042 ip6_sprintf(ip6buf, 1043 &pr->ndpr_prefix.sin6_addr), 1044 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 1045 /* proceed anyway. XXX: is it correct? */ 1046 } 1047 } 1048 1049 if (dr && pfxrtr_lookup(pr, dr) == NULL) 1050 pfxrtr_add(pr, dr); 1051 } else { 1052 struct nd_prefix *newpr = NULL; 1053 1054 newprefix = 1; 1055 1056 if (new->ndpr_vltime == 0) 1057 goto end; 1058 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 1059 goto end; 1060 1061 error = nd6_prelist_add(new, dr, &newpr); 1062 if (error != 0 || newpr == NULL) { 1063 nd6log((LOG_NOTICE, "prelist_update: " 1064 "nd6_prelist_add failed for %s/%d on %s " 1065 "errno=%d, returnpr=%p\n", 1066 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr), 1067 new->ndpr_plen, if_name(new->ndpr_ifp), 1068 error, newpr)); 1069 goto end; /* we should just give up in this case. */ 1070 } 1071 1072 /* 1073 * XXX: from the ND point of view, we can ignore a prefix 1074 * with the on-link bit being zero. However, we need a 1075 * prefix structure for references from autoconfigured 1076 * addresses. Thus, we explicitly make sure that the prefix 1077 * itself expires now. 1078 */ 1079 if (newpr->ndpr_raf_onlink == 0) { 1080 newpr->ndpr_vltime = 0; 1081 newpr->ndpr_pltime = 0; 1082 in6_init_prefix_ltimes(newpr); 1083 } 1084 1085 pr = newpr; 1086 } 1087 1088 /* 1089 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1090 * Note that pr must be non NULL at this point. 1091 */ 1092 1093 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1094 if (!new->ndpr_raf_auto) 1095 goto end; 1096 1097 /* 1098 * 5.5.3 (b). the link-local prefix should have been ignored in 1099 * nd6_ra_input. 1100 */ 1101 1102 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */ 1103 if (new->ndpr_pltime > new->ndpr_vltime) { 1104 error = EINVAL; /* XXX: won't be used */ 1105 goto end; 1106 } 1107 1108 /* 1109 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of 1110 * an address configured by stateless autoconfiguration already in the 1111 * list of addresses associated with the interface, and the Valid 1112 * Lifetime is not 0, form an address. We first check if we have 1113 * a matching prefix. 1114 * Note: we apply a clarification in rfc2462bis-02 here. We only 1115 * consider autoconfigured addresses while RFC2462 simply said 1116 * "address". 1117 */ 1118 IF_ADDR_LOCK(ifp); 1119 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1120 struct in6_ifaddr *ifa6; 1121 u_int32_t remaininglifetime; 1122 1123 if (ifa->ifa_addr->sa_family != AF_INET6) 1124 continue; 1125 1126 ifa6 = (struct in6_ifaddr *)ifa; 1127 1128 /* 1129 * We only consider autoconfigured addresses as per rfc2462bis. 1130 */ 1131 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) 1132 continue; 1133 1134 /* 1135 * Spec is not clear here, but I believe we should concentrate 1136 * on unicast (i.e. not anycast) addresses. 1137 * XXX: other ia6_flags? detached or duplicated? 1138 */ 1139 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1140 continue; 1141 1142 /* 1143 * Ignore the address if it is not associated with a prefix 1144 * or is associated with a prefix that is different from this 1145 * one. (pr is never NULL here) 1146 */ 1147 if (ifa6->ia6_ndpr != pr) 1148 continue; 1149 1150 if (ia6_match == NULL) /* remember the first one */ 1151 ia6_match = ifa6; 1152 1153 /* 1154 * An already autoconfigured address matched. Now that we 1155 * are sure there is at least one matched address, we can 1156 * proceed to 5.5.3. (e): update the lifetimes according to the 1157 * "two hours" rule and the privacy extension. 1158 * We apply some clarifications in rfc2462bis: 1159 * - use remaininglifetime instead of storedlifetime as a 1160 * variable name 1161 * - remove the dead code in the "two-hour" rule 1162 */ 1163 #define TWOHOUR (120*60) 1164 lt6_tmp = ifa6->ia6_lifetime; 1165 1166 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1167 remaininglifetime = ND6_INFINITE_LIFETIME; 1168 else if (time_second - ifa6->ia6_updatetime > 1169 lt6_tmp.ia6t_vltime) { 1170 /* 1171 * The case of "invalid" address. We should usually 1172 * not see this case. 1173 */ 1174 remaininglifetime = 0; 1175 } else 1176 remaininglifetime = lt6_tmp.ia6t_vltime - 1177 (time_second - ifa6->ia6_updatetime); 1178 1179 /* when not updating, keep the current stored lifetime. */ 1180 lt6_tmp.ia6t_vltime = remaininglifetime; 1181 1182 if (TWOHOUR < new->ndpr_vltime || 1183 remaininglifetime < new->ndpr_vltime) { 1184 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1185 } else if (remaininglifetime <= TWOHOUR) { 1186 if (auth) { 1187 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1188 } 1189 } else { 1190 /* 1191 * new->ndpr_vltime <= TWOHOUR && 1192 * TWOHOUR < remaininglifetime 1193 */ 1194 lt6_tmp.ia6t_vltime = TWOHOUR; 1195 } 1196 1197 /* The 2 hour rule is not imposed for preferred lifetime. */ 1198 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1199 1200 in6_init_address_ltimes(pr, <6_tmp); 1201 1202 /* 1203 * We need to treat lifetimes for temporary addresses 1204 * differently, according to 1205 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1); 1206 * we only update the lifetimes when they are in the maximum 1207 * intervals. 1208 */ 1209 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 1210 u_int32_t maxvltime, maxpltime; 1211 1212 if (V_ip6_temp_valid_lifetime > 1213 (u_int32_t)((time_second - ifa6->ia6_createtime) + 1214 V_ip6_desync_factor)) { 1215 maxvltime = V_ip6_temp_valid_lifetime - 1216 (time_second - ifa6->ia6_createtime) - 1217 V_ip6_desync_factor; 1218 } else 1219 maxvltime = 0; 1220 if (V_ip6_temp_preferred_lifetime > 1221 (u_int32_t)((time_second - ifa6->ia6_createtime) + 1222 V_ip6_desync_factor)) { 1223 maxpltime = V_ip6_temp_preferred_lifetime - 1224 (time_second - ifa6->ia6_createtime) - 1225 V_ip6_desync_factor; 1226 } else 1227 maxpltime = 0; 1228 1229 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME || 1230 lt6_tmp.ia6t_vltime > maxvltime) { 1231 lt6_tmp.ia6t_vltime = maxvltime; 1232 } 1233 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME || 1234 lt6_tmp.ia6t_pltime > maxpltime) { 1235 lt6_tmp.ia6t_pltime = maxpltime; 1236 } 1237 } 1238 ifa6->ia6_lifetime = lt6_tmp; 1239 ifa6->ia6_updatetime = time_second; 1240 } 1241 IF_ADDR_UNLOCK(ifp); 1242 if (ia6_match == NULL && new->ndpr_vltime) { 1243 int ifidlen; 1244 1245 /* 1246 * 5.5.3 (d) (continued) 1247 * No address matched and the valid lifetime is non-zero. 1248 * Create a new address. 1249 */ 1250 1251 /* 1252 * Prefix Length check: 1253 * If the sum of the prefix length and interface identifier 1254 * length does not equal 128 bits, the Prefix Information 1255 * option MUST be ignored. The length of the interface 1256 * identifier is defined in a separate link-type specific 1257 * document. 1258 */ 1259 ifidlen = in6_if2idlen(ifp); 1260 if (ifidlen < 0) { 1261 /* this should not happen, so we always log it. */ 1262 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n", 1263 if_name(ifp)); 1264 goto end; 1265 } 1266 if (ifidlen + pr->ndpr_plen != 128) { 1267 nd6log((LOG_INFO, 1268 "prelist_update: invalid prefixlen " 1269 "%d for %s, ignored\n", 1270 pr->ndpr_plen, if_name(ifp))); 1271 goto end; 1272 } 1273 1274 if ((ia6 = in6_ifadd(new, mcast)) != NULL) { 1275 /* 1276 * note that we should use pr (not new) for reference. 1277 */ 1278 pr->ndpr_refcnt++; 1279 ia6->ia6_ndpr = pr; 1280 1281 /* 1282 * RFC 3041 3.3 (2). 1283 * When a new public address is created as described 1284 * in RFC2462, also create a new temporary address. 1285 * 1286 * RFC 3041 3.5. 1287 * When an interface connects to a new link, a new 1288 * randomized interface identifier should be generated 1289 * immediately together with a new set of temporary 1290 * addresses. Thus, we specifiy 1 as the 2nd arg of 1291 * in6_tmpifadd(). 1292 */ 1293 if (V_ip6_use_tempaddr) { 1294 int e; 1295 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) { 1296 nd6log((LOG_NOTICE, "prelist_update: " 1297 "failed to create a temporary " 1298 "address, errno=%d\n", 1299 e)); 1300 } 1301 } 1302 ifa_free(&ia6->ia_ifa); 1303 1304 /* 1305 * A newly added address might affect the status 1306 * of other addresses, so we check and update it. 1307 * XXX: what if address duplication happens? 1308 */ 1309 pfxlist_onlink_check(); 1310 } else { 1311 /* just set an error. do not bark here. */ 1312 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1313 } 1314 } 1315 1316 end: 1317 splx(s); 1318 return error; 1319 } 1320 1321 /* 1322 * A supplement function used in the on-link detection below; 1323 * detect if a given prefix has a (probably) reachable advertising router. 1324 * XXX: lengthy function name... 1325 */ 1326 static struct nd_pfxrouter * 1327 find_pfxlist_reachable_router(struct nd_prefix *pr) 1328 { 1329 struct nd_pfxrouter *pfxrtr; 1330 struct llentry *ln; 1331 int canreach; 1332 1333 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr != NULL; 1334 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1335 IF_AFDATA_LOCK(pfxrtr->router->ifp); 1336 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp); 1337 IF_AFDATA_UNLOCK(pfxrtr->router->ifp); 1338 if (ln == NULL) 1339 continue; 1340 canreach = ND6_IS_LLINFO_PROBREACH(ln); 1341 LLE_RUNLOCK(ln); 1342 if (canreach) 1343 break; 1344 } 1345 return (pfxrtr); 1346 } 1347 1348 /* 1349 * Check if each prefix in the prefix list has at least one available router 1350 * that advertised the prefix (a router is "available" if its neighbor cache 1351 * entry is reachable or probably reachable). 1352 * If the check fails, the prefix may be off-link, because, for example, 1353 * we have moved from the network but the lifetime of the prefix has not 1354 * expired yet. So we should not use the prefix if there is another prefix 1355 * that has an available router. 1356 * But, if there is no prefix that has an available router, we still regards 1357 * all the prefixes as on-link. This is because we can't tell if all the 1358 * routers are simply dead or if we really moved from the network and there 1359 * is no router around us. 1360 */ 1361 void 1362 pfxlist_onlink_check() 1363 { 1364 struct nd_prefix *pr; 1365 struct in6_ifaddr *ifa; 1366 struct nd_defrouter *dr; 1367 struct nd_pfxrouter *pfxrtr = NULL; 1368 1369 /* 1370 * Check if there is a prefix that has a reachable advertising 1371 * router. 1372 */ 1373 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1374 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1375 break; 1376 } 1377 1378 /* 1379 * If we have no such prefix, check whether we still have a router 1380 * that does not advertise any prefixes. 1381 */ 1382 if (pr == NULL) { 1383 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr; 1384 dr = TAILQ_NEXT(dr, dr_entry)) { 1385 struct nd_prefix *pr0; 1386 1387 for (pr0 = V_nd_prefix.lh_first; pr0; 1388 pr0 = pr0->ndpr_next) { 1389 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL) 1390 break; 1391 } 1392 if (pfxrtr != NULL) 1393 break; 1394 } 1395 } 1396 if (pr != NULL || (TAILQ_FIRST(&V_nd_defrouter) && pfxrtr == NULL)) { 1397 /* 1398 * There is at least one prefix that has a reachable router, 1399 * or at least a router which probably does not advertise 1400 * any prefixes. The latter would be the case when we move 1401 * to a new link where we have a router that does not provide 1402 * prefixes and we configure an address by hand. 1403 * Detach prefixes which have no reachable advertising 1404 * router, and attach other prefixes. 1405 */ 1406 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1407 /* XXX: a link-local prefix should never be detached */ 1408 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1409 continue; 1410 1411 /* 1412 * we aren't interested in prefixes without the L bit 1413 * set. 1414 */ 1415 if (pr->ndpr_raf_onlink == 0) 1416 continue; 1417 1418 if (pr->ndpr_raf_auto == 0) 1419 continue; 1420 1421 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1422 find_pfxlist_reachable_router(pr) == NULL) 1423 pr->ndpr_stateflags |= NDPRF_DETACHED; 1424 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1425 find_pfxlist_reachable_router(pr) != 0) 1426 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1427 } 1428 } else { 1429 /* there is no prefix that has a reachable router */ 1430 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1431 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1432 continue; 1433 1434 if (pr->ndpr_raf_onlink == 0) 1435 continue; 1436 1437 if (pr->ndpr_raf_auto == 0) 1438 continue; 1439 1440 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1441 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1442 } 1443 } 1444 1445 /* 1446 * Remove each interface route associated with a (just) detached 1447 * prefix, and reinstall the interface route for a (just) attached 1448 * prefix. Note that all attempt of reinstallation does not 1449 * necessarily success, when a same prefix is shared among multiple 1450 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1451 * so we don't have to care about them. 1452 */ 1453 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1454 int e; 1455 char ip6buf[INET6_ADDRSTRLEN]; 1456 1457 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1458 continue; 1459 1460 if (pr->ndpr_raf_onlink == 0) 1461 continue; 1462 1463 if (pr->ndpr_raf_auto == 0) 1464 continue; 1465 1466 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1467 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1468 if ((e = nd6_prefix_offlink(pr)) != 0) { 1469 nd6log((LOG_ERR, 1470 "pfxlist_onlink_check: failed to " 1471 "make %s/%d offlink, errno=%d\n", 1472 ip6_sprintf(ip6buf, 1473 &pr->ndpr_prefix.sin6_addr), 1474 pr->ndpr_plen, e)); 1475 } 1476 } 1477 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1478 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && 1479 pr->ndpr_raf_onlink) { 1480 if ((e = nd6_prefix_onlink(pr)) != 0) { 1481 nd6log((LOG_ERR, 1482 "pfxlist_onlink_check: failed to " 1483 "make %s/%d onlink, errno=%d\n", 1484 ip6_sprintf(ip6buf, 1485 &pr->ndpr_prefix.sin6_addr), 1486 pr->ndpr_plen, e)); 1487 } 1488 } 1489 } 1490 1491 /* 1492 * Changes on the prefix status might affect address status as well. 1493 * Make sure that all addresses derived from an attached prefix are 1494 * attached, and that all addresses derived from a detached prefix are 1495 * detached. Note, however, that a manually configured address should 1496 * always be attached. 1497 * The precise detection logic is same as the one for prefixes. 1498 * 1499 * XXXRW: in6_ifaddrhead locking. 1500 */ 1501 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1502 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1503 continue; 1504 1505 if (ifa->ia6_ndpr == NULL) { 1506 /* 1507 * This can happen when we first configure the address 1508 * (i.e. the address exists, but the prefix does not). 1509 * XXX: complicated relationships... 1510 */ 1511 continue; 1512 } 1513 1514 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1515 break; 1516 } 1517 if (ifa) { 1518 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1519 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1520 continue; 1521 1522 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1523 continue; 1524 1525 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) { 1526 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1527 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1528 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1529 nd6_dad_start((struct ifaddr *)ifa, 0); 1530 } 1531 } else { 1532 ifa->ia6_flags |= IN6_IFF_DETACHED; 1533 } 1534 } 1535 } 1536 else { 1537 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1538 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1539 continue; 1540 1541 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1542 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1543 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1544 /* Do we need a delay in this case? */ 1545 nd6_dad_start((struct ifaddr *)ifa, 0); 1546 } 1547 } 1548 } 1549 } 1550 1551 int 1552 nd6_prefix_onlink(struct nd_prefix *pr) 1553 { 1554 struct ifaddr *ifa; 1555 struct ifnet *ifp = pr->ndpr_ifp; 1556 struct sockaddr_in6 mask6; 1557 struct nd_prefix *opr; 1558 u_long rtflags; 1559 int error = 0; 1560 struct radix_node_head *rnh; 1561 struct rtentry *rt = NULL; 1562 char ip6buf[INET6_ADDRSTRLEN]; 1563 struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1564 1565 /* sanity check */ 1566 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1567 nd6log((LOG_ERR, 1568 "nd6_prefix_onlink: %s/%d is already on-link\n", 1569 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1570 pr->ndpr_plen)); 1571 return (EEXIST); 1572 } 1573 1574 /* 1575 * Add the interface route associated with the prefix. Before 1576 * installing the route, check if there's the same prefix on another 1577 * interface, and the prefix has already installed the interface route. 1578 * Although such a configuration is expected to be rare, we explicitly 1579 * allow it. 1580 */ 1581 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1582 if (opr == pr) 1583 continue; 1584 1585 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1586 continue; 1587 1588 if (opr->ndpr_plen == pr->ndpr_plen && 1589 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1590 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) 1591 return (0); 1592 } 1593 1594 /* 1595 * We prefer link-local addresses as the associated interface address. 1596 */ 1597 /* search for a link-local addr */ 1598 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1599 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST); 1600 if (ifa == NULL) { 1601 /* XXX: freebsd does not have ifa_ifwithaf */ 1602 IF_ADDR_LOCK(ifp); 1603 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1604 if (ifa->ifa_addr->sa_family == AF_INET6) 1605 break; 1606 } 1607 if (ifa != NULL) 1608 ifa_ref(ifa); 1609 IF_ADDR_UNLOCK(ifp); 1610 /* should we care about ia6_flags? */ 1611 } 1612 if (ifa == NULL) { 1613 /* 1614 * This can still happen, when, for example, we receive an RA 1615 * containing a prefix with the L bit set and the A bit clear, 1616 * after removing all IPv6 addresses on the receiving 1617 * interface. This should, of course, be rare though. 1618 */ 1619 nd6log((LOG_NOTICE, 1620 "nd6_prefix_onlink: failed to find any ifaddr" 1621 " to add route for a prefix(%s/%d) on %s\n", 1622 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1623 pr->ndpr_plen, if_name(ifp))); 1624 return (0); 1625 } 1626 1627 /* 1628 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1629 * ifa->ifa_rtrequest = nd6_rtrequest; 1630 */ 1631 bzero(&mask6, sizeof(mask6)); 1632 mask6.sin6_len = sizeof(mask6); 1633 mask6.sin6_addr = pr->ndpr_mask; 1634 rtflags = ifa->ifa_flags | RTF_UP; 1635 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1636 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt); 1637 if (error == 0) { 1638 if (rt != NULL) /* this should be non NULL, though */ { 1639 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6); 1640 /* XXX what if rhn == NULL? */ 1641 RADIX_NODE_HEAD_LOCK(rnh); 1642 RT_LOCK(rt); 1643 if (!rt_setgate(rt, rt_key(rt), (struct sockaddr *)&null_sdl)) { 1644 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1645 rt->rt_ifp->if_type; 1646 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1647 rt->rt_ifp->if_index; 1648 } 1649 RADIX_NODE_HEAD_UNLOCK(rnh); 1650 nd6_rtmsg(RTM_ADD, rt); 1651 RT_UNLOCK(rt); 1652 } 1653 pr->ndpr_stateflags |= NDPRF_ONLINK; 1654 } else { 1655 char ip6bufg[INET6_ADDRSTRLEN], ip6bufm[INET6_ADDRSTRLEN]; 1656 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1657 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1658 "errno = %d\n", 1659 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1660 pr->ndpr_plen, if_name(ifp), 1661 ip6_sprintf(ip6bufg, &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1662 ip6_sprintf(ip6bufm, &mask6.sin6_addr), rtflags, error)); 1663 } 1664 1665 if (rt != NULL) { 1666 RT_LOCK(rt); 1667 RT_REMREF(rt); 1668 RT_UNLOCK(rt); 1669 } 1670 if (ifa != NULL) 1671 ifa_free(ifa); 1672 1673 return (error); 1674 } 1675 1676 int 1677 nd6_prefix_offlink(struct nd_prefix *pr) 1678 { 1679 int error = 0; 1680 struct ifnet *ifp = pr->ndpr_ifp; 1681 struct nd_prefix *opr; 1682 struct sockaddr_in6 sa6, mask6; 1683 struct rtentry *rt = NULL; 1684 char ip6buf[INET6_ADDRSTRLEN]; 1685 1686 /* sanity check */ 1687 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1688 nd6log((LOG_ERR, 1689 "nd6_prefix_offlink: %s/%d is already off-link\n", 1690 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1691 pr->ndpr_plen)); 1692 return (EEXIST); 1693 } 1694 1695 bzero(&sa6, sizeof(sa6)); 1696 sa6.sin6_family = AF_INET6; 1697 sa6.sin6_len = sizeof(sa6); 1698 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1699 sizeof(struct in6_addr)); 1700 bzero(&mask6, sizeof(mask6)); 1701 mask6.sin6_family = AF_INET6; 1702 mask6.sin6_len = sizeof(sa6); 1703 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1704 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1705 (struct sockaddr *)&mask6, 0, &rt); 1706 if (error == 0) { 1707 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1708 1709 /* report the route deletion to the routing socket. */ 1710 if (rt != NULL) 1711 nd6_rtmsg(RTM_DELETE, rt); 1712 1713 /* 1714 * There might be the same prefix on another interface, 1715 * the prefix which could not be on-link just because we have 1716 * the interface route (see comments in nd6_prefix_onlink). 1717 * If there's one, try to make the prefix on-link on the 1718 * interface. 1719 */ 1720 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1721 if (opr == pr) 1722 continue; 1723 1724 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) 1725 continue; 1726 1727 /* 1728 * KAME specific: detached prefixes should not be 1729 * on-link. 1730 */ 1731 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1732 continue; 1733 1734 if (opr->ndpr_plen == pr->ndpr_plen && 1735 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1736 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { 1737 int e; 1738 1739 if ((e = nd6_prefix_onlink(opr)) != 0) { 1740 nd6log((LOG_ERR, 1741 "nd6_prefix_offlink: failed to " 1742 "recover a prefix %s/%d from %s " 1743 "to %s (errno = %d)\n", 1744 ip6_sprintf(ip6buf, 1745 &opr->ndpr_prefix.sin6_addr), 1746 opr->ndpr_plen, if_name(ifp), 1747 if_name(opr->ndpr_ifp), e)); 1748 } 1749 } 1750 } 1751 } else { 1752 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1753 nd6log((LOG_ERR, 1754 "nd6_prefix_offlink: failed to delete route: " 1755 "%s/%d on %s (errno = %d)\n", 1756 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen, 1757 if_name(ifp), error)); 1758 } 1759 1760 if (rt != NULL) { 1761 RTFREE(rt); 1762 } 1763 1764 return (error); 1765 } 1766 1767 static struct in6_ifaddr * 1768 in6_ifadd(struct nd_prefixctl *pr, int mcast) 1769 { 1770 struct ifnet *ifp = pr->ndpr_ifp; 1771 struct ifaddr *ifa; 1772 struct in6_aliasreq ifra; 1773 struct in6_ifaddr *ia, *ib; 1774 int error, plen0; 1775 struct in6_addr mask; 1776 int prefixlen = pr->ndpr_plen; 1777 int updateflags; 1778 char ip6buf[INET6_ADDRSTRLEN]; 1779 1780 in6_prefixlen2mask(&mask, prefixlen); 1781 1782 /* 1783 * find a link-local address (will be interface ID). 1784 * Is it really mandatory? Theoretically, a global or a site-local 1785 * address can be configured without a link-local address, if we 1786 * have a unique interface identifier... 1787 * 1788 * it is not mandatory to have a link-local address, we can generate 1789 * interface identifier on the fly. we do this because: 1790 * (1) it should be the easiest way to find interface identifier. 1791 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1792 * for multiple addresses on a single interface, and possible shortcut 1793 * of DAD. we omitted DAD for this reason in the past. 1794 * (3) a user can prevent autoconfiguration of global address 1795 * by removing link-local address by hand (this is partly because we 1796 * don't have other way to control the use of IPv6 on an interface. 1797 * this has been our design choice - cf. NRL's "ifconfig auto"). 1798 * (4) it is easier to manage when an interface has addresses 1799 * with the same interface identifier, than to have multiple addresses 1800 * with different interface identifiers. 1801 */ 1802 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */ 1803 if (ifa) 1804 ib = (struct in6_ifaddr *)ifa; 1805 else 1806 return NULL; 1807 1808 /* prefixlen + ifidlen must be equal to 128 */ 1809 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1810 if (prefixlen != plen0) { 1811 ifa_free(ifa); 1812 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1813 "(prefix=%d ifid=%d)\n", 1814 if_name(ifp), prefixlen, 128 - plen0)); 1815 return NULL; 1816 } 1817 1818 /* make ifaddr */ 1819 1820 bzero(&ifra, sizeof(ifra)); 1821 /* 1822 * in6_update_ifa() does not use ifra_name, but we accurately set it 1823 * for safety. 1824 */ 1825 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1826 ifra.ifra_addr.sin6_family = AF_INET6; 1827 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1828 /* prefix */ 1829 ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr; 1830 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1831 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1832 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1833 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1834 1835 /* interface ID */ 1836 ifra.ifra_addr.sin6_addr.s6_addr32[0] |= 1837 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); 1838 ifra.ifra_addr.sin6_addr.s6_addr32[1] |= 1839 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); 1840 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1841 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); 1842 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1843 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); 1844 ifa_free(ifa); 1845 1846 /* new prefix mask. */ 1847 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1848 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1849 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1850 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1851 1852 /* lifetimes. */ 1853 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1854 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1855 1856 /* XXX: scope zone ID? */ 1857 1858 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1859 1860 /* 1861 * Make sure that we do not have this address already. This should 1862 * usually not happen, but we can still see this case, e.g., if we 1863 * have manually configured the exact address to be configured. 1864 */ 1865 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, 1866 &ifra.ifra_addr.sin6_addr); 1867 if (ifa != NULL) { 1868 ifa_free(ifa); 1869 /* this should be rare enough to make an explicit log */ 1870 log(LOG_INFO, "in6_ifadd: %s is already configured\n", 1871 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr)); 1872 return (NULL); 1873 } 1874 1875 /* 1876 * Allocate ifaddr structure, link into chain, etc. 1877 * If we are going to create a new address upon receiving a multicasted 1878 * RA, we need to impose a random delay before starting DAD. 1879 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2] 1880 */ 1881 updateflags = 0; 1882 if (mcast) 1883 updateflags |= IN6_IFAUPDATE_DADDELAY; 1884 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) { 1885 nd6log((LOG_ERR, 1886 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1887 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr), 1888 if_name(ifp), error)); 1889 return (NULL); /* ifaddr must not have been allocated. */ 1890 } 1891 1892 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1893 /* 1894 * XXXRW: Assumption of non-NULLness here might not be true with 1895 * fine-grained locking -- should we validate it? Or just return 1896 * earlier ifa rather than looking it up again? 1897 */ 1898 return (ia); /* this is always non-NULL and referenced. */ 1899 } 1900 1901 /* 1902 * ia0 - corresponding public address 1903 */ 1904 int 1905 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay) 1906 { 1907 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1908 struct in6_ifaddr *newia, *ia; 1909 struct in6_aliasreq ifra; 1910 int i, error; 1911 int trylimit = 3; /* XXX: adhoc value */ 1912 int updateflags; 1913 u_int32_t randid[2]; 1914 time_t vltime0, pltime0; 1915 1916 bzero(&ifra, sizeof(ifra)); 1917 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1918 ifra.ifra_addr = ia0->ia_addr; 1919 /* copy prefix mask */ 1920 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1921 /* clear the old IFID */ 1922 for (i = 0; i < 4; i++) { 1923 ifra.ifra_addr.sin6_addr.s6_addr32[i] &= 1924 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1925 } 1926 1927 again: 1928 if (in6_get_tmpifid(ifp, (u_int8_t *)randid, 1929 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) { 1930 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good " 1931 "random IFID\n")); 1932 return (EINVAL); 1933 } 1934 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1935 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1936 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1937 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1938 1939 /* 1940 * in6_get_tmpifid() quite likely provided a unique interface ID. 1941 * However, we may still have a chance to see collision, because 1942 * there may be a time lag between generation of the ID and generation 1943 * of the address. So, we'll do one more sanity check. 1944 */ 1945 IN6_IFADDR_RLOCK(); 1946 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1947 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1948 &ifra.ifra_addr.sin6_addr)) { 1949 if (trylimit-- == 0) { 1950 IN6_IFADDR_RUNLOCK(); 1951 /* 1952 * Give up. Something strange should have 1953 * happened. 1954 */ 1955 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to " 1956 "find a unique random IFID\n")); 1957 return (EEXIST); 1958 } 1959 IN6_IFADDR_RUNLOCK(); 1960 forcegen = 1; 1961 goto again; 1962 } 1963 } 1964 IN6_IFADDR_RUNLOCK(); 1965 1966 /* 1967 * The Valid Lifetime is the lower of the Valid Lifetime of the 1968 * public address or TEMP_VALID_LIFETIME. 1969 * The Preferred Lifetime is the lower of the Preferred Lifetime 1970 * of the public address or TEMP_PREFERRED_LIFETIME - 1971 * DESYNC_FACTOR. 1972 */ 1973 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1974 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1975 (ia0->ia6_lifetime.ia6t_vltime - 1976 (time_second - ia0->ia6_updatetime)); 1977 if (vltime0 > V_ip6_temp_valid_lifetime) 1978 vltime0 = V_ip6_temp_valid_lifetime; 1979 } else 1980 vltime0 = V_ip6_temp_valid_lifetime; 1981 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1982 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1983 (ia0->ia6_lifetime.ia6t_pltime - 1984 (time_second - ia0->ia6_updatetime)); 1985 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){ 1986 pltime0 = V_ip6_temp_preferred_lifetime - 1987 V_ip6_desync_factor; 1988 } 1989 } else 1990 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor; 1991 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1992 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1993 1994 /* 1995 * A temporary address is created only if this calculated Preferred 1996 * Lifetime is greater than REGEN_ADVANCE time units. 1997 */ 1998 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance) 1999 return (0); 2000 2001 /* XXX: scope zone ID? */ 2002 2003 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 2004 2005 /* allocate ifaddr structure, link into chain, etc. */ 2006 updateflags = 0; 2007 if (delay) 2008 updateflags |= IN6_IFAUPDATE_DADDELAY; 2009 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) 2010 return (error); 2011 2012 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 2013 if (newia == NULL) { /* XXX: can it happen? */ 2014 nd6log((LOG_ERR, 2015 "in6_tmpifadd: ifa update succeeded, but we got " 2016 "no ifaddr\n")); 2017 return (EINVAL); /* XXX */ 2018 } 2019 newia->ia6_ndpr = ia0->ia6_ndpr; 2020 newia->ia6_ndpr->ndpr_refcnt++; 2021 ifa_free(&newia->ia_ifa); 2022 2023 /* 2024 * A newly added address might affect the status of other addresses. 2025 * XXX: when the temporary address is generated with a new public 2026 * address, the onlink check is redundant. However, it would be safe 2027 * to do the check explicitly everywhere a new address is generated, 2028 * and, in fact, we surely need the check when we create a new 2029 * temporary address due to deprecation of an old temporary address. 2030 */ 2031 pfxlist_onlink_check(); 2032 2033 return (0); 2034 } 2035 2036 static int 2037 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 2038 { 2039 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 2040 ndpr->ndpr_preferred = 0; 2041 else 2042 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 2043 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 2044 ndpr->ndpr_expire = 0; 2045 else 2046 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 2047 2048 return 0; 2049 } 2050 2051 static void 2052 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 2053 { 2054 /* init ia6t_expire */ 2055 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 2056 lt6->ia6t_expire = 0; 2057 else { 2058 lt6->ia6t_expire = time_second; 2059 lt6->ia6t_expire += lt6->ia6t_vltime; 2060 } 2061 2062 /* init ia6t_preferred */ 2063 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 2064 lt6->ia6t_preferred = 0; 2065 else { 2066 lt6->ia6t_preferred = time_second; 2067 lt6->ia6t_preferred += lt6->ia6t_pltime; 2068 } 2069 } 2070 2071 /* 2072 * Delete all the routing table entries that use the specified gateway. 2073 * XXX: this function causes search through all entries of routing table, so 2074 * it shouldn't be called when acting as a router. 2075 */ 2076 void 2077 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 2078 { 2079 struct radix_node_head *rnh; 2080 int s = splnet(); 2081 2082 /* We'll care only link-local addresses */ 2083 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 2084 splx(s); 2085 return; 2086 } 2087 2088 rnh = rt_tables_get_rnh(0, AF_INET6); 2089 if (rnh == NULL) 2090 return; 2091 2092 RADIX_NODE_HEAD_LOCK(rnh); 2093 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 2094 RADIX_NODE_HEAD_UNLOCK(rnh); 2095 splx(s); 2096 } 2097 2098 static int 2099 rt6_deleteroute(struct radix_node *rn, void *arg) 2100 { 2101 #define SIN6(s) ((struct sockaddr_in6 *)s) 2102 struct rtentry *rt = (struct rtentry *)rn; 2103 struct in6_addr *gate = (struct in6_addr *)arg; 2104 2105 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 2106 return (0); 2107 2108 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) { 2109 return (0); 2110 } 2111 2112 /* 2113 * Do not delete a static route. 2114 * XXX: this seems to be a bit ad-hoc. Should we consider the 2115 * 'cloned' bit instead? 2116 */ 2117 if ((rt->rt_flags & RTF_STATIC) != 0) 2118 return (0); 2119 2120 /* 2121 * We delete only host route. This means, in particular, we don't 2122 * delete default route. 2123 */ 2124 if ((rt->rt_flags & RTF_HOST) == 0) 2125 return (0); 2126 2127 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 2128 rt_mask(rt), rt->rt_flags, 0)); 2129 #undef SIN6 2130 } 2131 2132 int 2133 nd6_setdefaultiface(int ifindex) 2134 { 2135 int error = 0; 2136 2137 if (ifindex < 0 || V_if_index < ifindex) 2138 return (EINVAL); 2139 if (ifindex != 0 && !ifnet_byindex(ifindex)) 2140 return (EINVAL); 2141 2142 if (V_nd6_defifindex != ifindex) { 2143 V_nd6_defifindex = ifindex; 2144 if (V_nd6_defifindex > 0) 2145 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex); 2146 else 2147 V_nd6_defifp = NULL; 2148 2149 /* 2150 * Our current implementation assumes one-to-one maping between 2151 * interfaces and links, so it would be natural to use the 2152 * default interface as the default link. 2153 */ 2154 scope6_setdefault(V_nd6_defifp); 2155 } 2156 2157 return (error); 2158 }
Cache object: 6f23f3465324c882fe501e930482507c
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