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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("$FreeBSD$"); 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(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(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(struct nd_prefix *, 85 struct in6_addrlifetime *); 86 87 static int nd6_prefix_onlink(struct nd_prefix *); 88 static int nd6_prefix_offlink(struct nd_prefix *); 89 90 static int rt6_deleteroute(struct radix_node *, void *); 91 92 VNET_DECLARE(int, nd6_recalc_reachtm_interval); 93 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval) 94 95 static VNET_DEFINE(struct ifnet *, nd6_defifp); 96 VNET_DEFINE(int, nd6_defifindex); 97 #define V_nd6_defifp VNET(nd6_defifp) 98 99 VNET_DEFINE(int, ip6_use_tempaddr) = 0; 100 101 VNET_DEFINE(int, ip6_desync_factor); 102 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME; 103 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME; 104 105 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE; 106 107 /* RTPREF_MEDIUM has to be 0! */ 108 #define RTPREF_HIGH 1 109 #define RTPREF_MEDIUM 0 110 #define RTPREF_LOW (-1) 111 #define RTPREF_RESERVED (-2) 112 #define RTPREF_INVALID (-3) /* internal */ 113 114 /* 115 * Receive Router Solicitation Message - just for routers. 116 * Router solicitation/advertisement is mostly managed by userland program 117 * (rtadvd) so here we have no function like nd6_ra_output(). 118 * 119 * Based on RFC 2461 120 */ 121 void 122 nd6_rs_input(struct mbuf *m, int off, int icmp6len) 123 { 124 struct ifnet *ifp = m->m_pkthdr.rcvif; 125 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 126 struct nd_router_solicit *nd_rs; 127 struct in6_addr saddr6 = ip6->ip6_src; 128 char *lladdr = NULL; 129 int lladdrlen = 0; 130 union nd_opts ndopts; 131 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 132 133 /* 134 * Accept RS only when V_ip6_forwarding=1 and the interface has 135 * no ND6_IFF_ACCEPT_RTADV. 136 */ 137 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) 138 goto freeit; 139 140 /* Sanity checks */ 141 if (ip6->ip6_hlim != 255) { 142 nd6log((LOG_ERR, 143 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 144 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 145 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 146 goto bad; 147 } 148 149 /* 150 * Don't update the neighbor cache, if src = ::. 151 * This indicates that the src has no IP address assigned yet. 152 */ 153 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 154 goto freeit; 155 156 #ifndef PULLDOWN_TEST 157 IP6_EXTHDR_CHECK(m, off, icmp6len,); 158 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 159 #else 160 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 161 if (nd_rs == NULL) { 162 ICMP6STAT_INC(icp6s_tooshort); 163 return; 164 } 165 #endif 166 167 icmp6len -= sizeof(*nd_rs); 168 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 169 if (nd6_options(&ndopts) < 0) { 170 nd6log((LOG_INFO, 171 "nd6_rs_input: invalid ND option, ignored\n")); 172 /* nd6_options have incremented stats */ 173 goto freeit; 174 } 175 176 if (ndopts.nd_opts_src_lladdr) { 177 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 178 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 179 } 180 181 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 182 nd6log((LOG_INFO, 183 "nd6_rs_input: lladdrlen mismatch for %s " 184 "(if %d, RS packet %d)\n", 185 ip6_sprintf(ip6bufs, &saddr6), 186 ifp->if_addrlen, lladdrlen - 2)); 187 goto bad; 188 } 189 190 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 191 192 freeit: 193 m_freem(m); 194 return; 195 196 bad: 197 ICMP6STAT_INC(icp6s_badrs); 198 m_freem(m); 199 } 200 201 /* 202 * Receive Router Advertisement Message. 203 * 204 * Based on RFC 2461 205 * TODO: on-link bit on prefix information 206 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 207 */ 208 void 209 nd6_ra_input(struct mbuf *m, int off, int icmp6len) 210 { 211 struct ifnet *ifp = m->m_pkthdr.rcvif; 212 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 213 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 214 struct nd_router_advert *nd_ra; 215 struct in6_addr saddr6 = ip6->ip6_src; 216 int mcast = 0; 217 union nd_opts ndopts; 218 struct nd_defrouter *dr; 219 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 220 221 /* 222 * We only accept RAs only when the per-interface flag 223 * ND6_IFF_ACCEPT_RTADV is on the receiving interface. 224 */ 225 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 226 goto freeit; 227 228 if (ip6->ip6_hlim != 255) { 229 nd6log((LOG_ERR, 230 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 231 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 232 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 233 goto bad; 234 } 235 236 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 237 nd6log((LOG_ERR, 238 "nd6_ra_input: src %s is not link-local\n", 239 ip6_sprintf(ip6bufs, &saddr6))); 240 goto bad; 241 } 242 243 #ifndef PULLDOWN_TEST 244 IP6_EXTHDR_CHECK(m, off, icmp6len,); 245 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 246 #else 247 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 248 if (nd_ra == NULL) { 249 ICMP6STAT_INC(icp6s_tooshort); 250 return; 251 } 252 #endif 253 254 icmp6len -= sizeof(*nd_ra); 255 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 256 if (nd6_options(&ndopts) < 0) { 257 nd6log((LOG_INFO, 258 "nd6_ra_input: invalid ND option, ignored\n")); 259 /* nd6_options have incremented stats */ 260 goto freeit; 261 } 262 263 { 264 struct nd_defrouter dr0; 265 u_int32_t advreachable = nd_ra->nd_ra_reachable; 266 267 /* remember if this is a multicasted advertisement */ 268 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 269 mcast = 1; 270 271 bzero(&dr0, sizeof(dr0)); 272 dr0.rtaddr = saddr6; 273 dr0.flags = nd_ra->nd_ra_flags_reserved; 274 /* 275 * Effectively-disable routes from RA messages when 276 * ND6_IFF_NO_RADR enabled on the receiving interface or 277 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1). 278 */ 279 if (ndi->flags & ND6_IFF_NO_RADR) 280 dr0.rtlifetime = 0; 281 else if (V_ip6_forwarding && !V_ip6_rfc6204w3) 282 dr0.rtlifetime = 0; 283 else 284 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 285 dr0.expire = time_second + dr0.rtlifetime; 286 dr0.ifp = ifp; 287 /* unspecified or not? (RFC 2461 6.3.4) */ 288 if (advreachable) { 289 advreachable = ntohl(advreachable); 290 if (advreachable <= MAX_REACHABLE_TIME && 291 ndi->basereachable != advreachable) { 292 ndi->basereachable = advreachable; 293 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 294 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */ 295 } 296 } 297 if (nd_ra->nd_ra_retransmit) 298 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 299 if (nd_ra->nd_ra_curhoplimit) { 300 if (ndi->chlim < nd_ra->nd_ra_curhoplimit) 301 ndi->chlim = nd_ra->nd_ra_curhoplimit; 302 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) { 303 log(LOG_ERR, "RA with a lower CurHopLimit sent from " 304 "%s on %s (current = %d, received = %d). " 305 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src), 306 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit); 307 } 308 } 309 dr = defrtrlist_update(&dr0); 310 } 311 312 /* 313 * prefix 314 */ 315 if (ndopts.nd_opts_pi) { 316 struct nd_opt_hdr *pt; 317 struct nd_opt_prefix_info *pi = NULL; 318 struct nd_prefixctl pr; 319 320 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 321 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 322 pt = (struct nd_opt_hdr *)((caddr_t)pt + 323 (pt->nd_opt_len << 3))) { 324 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 325 continue; 326 pi = (struct nd_opt_prefix_info *)pt; 327 328 if (pi->nd_opt_pi_len != 4) { 329 nd6log((LOG_INFO, 330 "nd6_ra_input: invalid option " 331 "len %d for prefix information option, " 332 "ignored\n", pi->nd_opt_pi_len)); 333 continue; 334 } 335 336 if (128 < pi->nd_opt_pi_prefix_len) { 337 nd6log((LOG_INFO, 338 "nd6_ra_input: invalid prefix " 339 "len %d for prefix information option, " 340 "ignored\n", pi->nd_opt_pi_prefix_len)); 341 continue; 342 } 343 344 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 345 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 346 nd6log((LOG_INFO, 347 "nd6_ra_input: invalid prefix " 348 "%s, ignored\n", 349 ip6_sprintf(ip6bufs, 350 &pi->nd_opt_pi_prefix))); 351 continue; 352 } 353 354 bzero(&pr, sizeof(pr)); 355 pr.ndpr_prefix.sin6_family = AF_INET6; 356 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 357 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 358 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 359 360 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 361 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 362 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 363 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 364 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 365 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 366 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); 367 (void)prelist_update(&pr, dr, m, mcast); 368 } 369 } 370 371 /* 372 * MTU 373 */ 374 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 375 u_long mtu; 376 u_long maxmtu; 377 378 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 379 380 /* lower bound */ 381 if (mtu < IPV6_MMTU) { 382 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 383 "mtu=%lu sent from %s, ignoring\n", 384 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src))); 385 goto skip; 386 } 387 388 /* upper bound */ 389 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) 390 ? ndi->maxmtu : ifp->if_mtu; 391 if (mtu <= maxmtu) { 392 int change = (ndi->linkmtu != mtu); 393 394 ndi->linkmtu = mtu; 395 if (change) /* in6_maxmtu may change */ 396 in6_setmaxmtu(); 397 } else { 398 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 399 "mtu=%lu sent from %s; " 400 "exceeds maxmtu %lu, ignoring\n", 401 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu)); 402 } 403 } 404 405 skip: 406 407 /* 408 * Source link layer address 409 */ 410 { 411 char *lladdr = NULL; 412 int lladdrlen = 0; 413 414 if (ndopts.nd_opts_src_lladdr) { 415 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 416 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 417 } 418 419 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 420 nd6log((LOG_INFO, 421 "nd6_ra_input: lladdrlen mismatch for %s " 422 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6), 423 ifp->if_addrlen, lladdrlen - 2)); 424 goto bad; 425 } 426 427 nd6_cache_lladdr(ifp, &saddr6, lladdr, 428 lladdrlen, ND_ROUTER_ADVERT, 0); 429 430 /* 431 * Installing a link-layer address might change the state of the 432 * router's neighbor cache, which might also affect our on-link 433 * detection of adveritsed prefixes. 434 */ 435 pfxlist_onlink_check(); 436 } 437 438 freeit: 439 m_freem(m); 440 return; 441 442 bad: 443 ICMP6STAT_INC(icp6s_badra); 444 m_freem(m); 445 } 446 447 /* 448 * default router list proccessing sub routines 449 */ 450 451 /* tell the change to user processes watching the routing socket. */ 452 static void 453 nd6_rtmsg(int cmd, struct rtentry *rt) 454 { 455 struct rt_addrinfo info; 456 struct ifnet *ifp; 457 struct ifaddr *ifa; 458 459 bzero((caddr_t)&info, sizeof(info)); 460 info.rti_info[RTAX_DST] = rt_key(rt); 461 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 462 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 463 ifp = rt->rt_ifp; 464 if (ifp != NULL) { 465 IF_ADDR_RLOCK(ifp); 466 ifa = TAILQ_FIRST(&ifp->if_addrhead); 467 info.rti_info[RTAX_IFP] = ifa->ifa_addr; 468 ifa_ref(ifa); 469 IF_ADDR_RUNLOCK(ifp); 470 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 471 } else 472 ifa = NULL; 473 474 rt_missmsg_fib(cmd, &info, rt->rt_flags, 0, rt->rt_fibnum); 475 if (ifa != NULL) 476 ifa_free(ifa); 477 } 478 479 static void 480 defrouter_addreq(struct nd_defrouter *new) 481 { 482 struct sockaddr_in6 def, mask, gate; 483 struct rtentry *newrt = NULL; 484 int s; 485 int error; 486 487 bzero(&def, sizeof(def)); 488 bzero(&mask, sizeof(mask)); 489 bzero(&gate, sizeof(gate)); 490 491 def.sin6_len = mask.sin6_len = gate.sin6_len = 492 sizeof(struct sockaddr_in6); 493 def.sin6_family = gate.sin6_family = AF_INET6; 494 gate.sin6_addr = new->rtaddr; 495 496 s = splnet(); 497 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def, 498 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 499 RTF_GATEWAY, &newrt, RT_DEFAULT_FIB); 500 if (newrt) { 501 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 502 RTFREE(newrt); 503 } 504 if (error == 0) 505 new->installed = 1; 506 splx(s); 507 return; 508 } 509 510 struct nd_defrouter * 511 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) 512 { 513 struct nd_defrouter *dr; 514 515 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 516 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 517 return (dr); 518 } 519 520 return (NULL); /* search failed */ 521 } 522 523 /* 524 * Remove the default route for a given router. 525 * This is just a subroutine function for defrouter_select(), and should 526 * not be called from anywhere else. 527 */ 528 static void 529 defrouter_delreq(struct nd_defrouter *dr) 530 { 531 struct sockaddr_in6 def, mask, gate; 532 struct rtentry *oldrt = NULL; 533 534 bzero(&def, sizeof(def)); 535 bzero(&mask, sizeof(mask)); 536 bzero(&gate, sizeof(gate)); 537 538 def.sin6_len = mask.sin6_len = gate.sin6_len = 539 sizeof(struct sockaddr_in6); 540 def.sin6_family = gate.sin6_family = AF_INET6; 541 gate.sin6_addr = dr->rtaddr; 542 543 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def, 544 (struct sockaddr *)&gate, 545 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, RT_DEFAULT_FIB); 546 if (oldrt) { 547 nd6_rtmsg(RTM_DELETE, oldrt); 548 RTFREE(oldrt); 549 } 550 551 dr->installed = 0; 552 } 553 554 /* 555 * remove all default routes from default router list 556 */ 557 void 558 defrouter_reset(void) 559 { 560 struct nd_defrouter *dr; 561 562 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) 563 defrouter_delreq(dr); 564 565 /* 566 * XXX should we also nuke any default routers in the kernel, by 567 * going through them by rtalloc1()? 568 */ 569 } 570 571 void 572 defrtrlist_del(struct nd_defrouter *dr) 573 { 574 struct nd_defrouter *deldr = NULL; 575 struct nd_prefix *pr; 576 577 /* 578 * Flush all the routing table entries that use the router 579 * as a next hop. 580 */ 581 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV) 582 rt6_flush(&dr->rtaddr, dr->ifp); 583 584 if (dr->installed) { 585 deldr = dr; 586 defrouter_delreq(dr); 587 } 588 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry); 589 590 /* 591 * Also delete all the pointers to the router in each prefix lists. 592 */ 593 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 594 struct nd_pfxrouter *pfxrtr; 595 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 596 pfxrtr_del(pfxrtr); 597 } 598 pfxlist_onlink_check(); 599 600 /* 601 * If the router is the primary one, choose a new one. 602 * Note that defrouter_select() will remove the current gateway 603 * from the routing table. 604 */ 605 if (deldr) 606 defrouter_select(); 607 608 free(dr, M_IP6NDP); 609 } 610 611 /* 612 * Default Router Selection according to Section 6.3.6 of RFC 2461 and 613 * draft-ietf-ipngwg-router-selection: 614 * 1) Routers that are reachable or probably reachable should be preferred. 615 * If we have more than one (probably) reachable router, prefer ones 616 * with the highest router preference. 617 * 2) When no routers on the list are known to be reachable or 618 * probably reachable, routers SHOULD be selected in a round-robin 619 * fashion, regardless of router preference values. 620 * 3) If the Default Router List is empty, assume that all 621 * destinations are on-link. 622 * 623 * We assume nd_defrouter is sorted by router preference value. 624 * Since the code below covers both with and without router preference cases, 625 * we do not need to classify the cases by ifdef. 626 * 627 * At this moment, we do not try to install more than one default router, 628 * even when the multipath routing is available, because we're not sure about 629 * the benefits for stub hosts comparing to the risk of making the code 630 * complicated and the possibility of introducing bugs. 631 */ 632 void 633 defrouter_select(void) 634 { 635 int s = splnet(); 636 struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL; 637 struct llentry *ln = NULL; 638 639 /* 640 * Let's handle easy case (3) first: 641 * If default router list is empty, there's nothing to be done. 642 */ 643 if (TAILQ_EMPTY(&V_nd_defrouter)) { 644 splx(s); 645 return; 646 } 647 648 /* 649 * Search for a (probably) reachable router from the list. 650 * We just pick up the first reachable one (if any), assuming that 651 * the ordering rule of the list described in defrtrlist_update(). 652 */ 653 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 654 IF_AFDATA_RLOCK(dr->ifp); 655 if (selected_dr == NULL && 656 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 657 ND6_IS_LLINFO_PROBREACH(ln)) { 658 selected_dr = dr; 659 } 660 IF_AFDATA_RUNLOCK(dr->ifp); 661 if (ln != NULL) { 662 LLE_RUNLOCK(ln); 663 ln = NULL; 664 } 665 666 if (dr->installed && installed_dr == NULL) 667 installed_dr = dr; 668 else if (dr->installed && installed_dr) { 669 /* this should not happen. warn for diagnosis. */ 670 log(LOG_ERR, "defrouter_select: more than one router" 671 " is installed\n"); 672 } 673 } 674 /* 675 * If none of the default routers was found to be reachable, 676 * round-robin the list regardless of preference. 677 * Otherwise, if we have an installed router, check if the selected 678 * (reachable) router should really be preferred to the installed one. 679 * We only prefer the new router when the old one is not reachable 680 * or when the new one has a really higher preference value. 681 */ 682 if (selected_dr == NULL) { 683 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry)) 684 selected_dr = TAILQ_FIRST(&V_nd_defrouter); 685 else 686 selected_dr = TAILQ_NEXT(installed_dr, dr_entry); 687 } else if (installed_dr) { 688 IF_AFDATA_RLOCK(installed_dr->ifp); 689 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) && 690 ND6_IS_LLINFO_PROBREACH(ln) && 691 rtpref(selected_dr) <= rtpref(installed_dr)) { 692 selected_dr = installed_dr; 693 } 694 IF_AFDATA_RUNLOCK(installed_dr->ifp); 695 if (ln != NULL) 696 LLE_RUNLOCK(ln); 697 } 698 699 /* 700 * If the selected router is different than the installed one, 701 * remove the installed router and install the selected one. 702 * Note that the selected router is never NULL here. 703 */ 704 if (installed_dr != selected_dr) { 705 if (installed_dr) 706 defrouter_delreq(installed_dr); 707 defrouter_addreq(selected_dr); 708 } 709 710 splx(s); 711 return; 712 } 713 714 /* 715 * for default router selection 716 * regards router-preference field as a 2-bit signed integer 717 */ 718 static int 719 rtpref(struct nd_defrouter *dr) 720 { 721 switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) { 722 case ND_RA_FLAG_RTPREF_HIGH: 723 return (RTPREF_HIGH); 724 case ND_RA_FLAG_RTPREF_MEDIUM: 725 case ND_RA_FLAG_RTPREF_RSV: 726 return (RTPREF_MEDIUM); 727 case ND_RA_FLAG_RTPREF_LOW: 728 return (RTPREF_LOW); 729 default: 730 /* 731 * This case should never happen. If it did, it would mean a 732 * serious bug of kernel internal. We thus always bark here. 733 * Or, can we even panic? 734 */ 735 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags); 736 return (RTPREF_INVALID); 737 } 738 /* NOTREACHED */ 739 } 740 741 static struct nd_defrouter * 742 defrtrlist_update(struct nd_defrouter *new) 743 { 744 struct nd_defrouter *dr, *n; 745 int s = splnet(); 746 747 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 748 /* entry exists */ 749 if (new->rtlifetime == 0) { 750 defrtrlist_del(dr); 751 dr = NULL; 752 } else { 753 int oldpref = rtpref(dr); 754 755 /* override */ 756 dr->flags = new->flags; /* xxx flag check */ 757 dr->rtlifetime = new->rtlifetime; 758 dr->expire = new->expire; 759 760 /* 761 * If the preference does not change, there's no need 762 * to sort the entries. Also make sure the selected 763 * router is still installed in the kernel. 764 */ 765 if (dr->installed && rtpref(new) == oldpref) { 766 splx(s); 767 return (dr); 768 } 769 770 /* 771 * preferred router may be changed, so relocate 772 * this router. 773 * XXX: calling TAILQ_REMOVE directly is a bad manner. 774 * However, since defrtrlist_del() has many side 775 * effects, we intentionally do so here. 776 * defrouter_select() below will handle routing 777 * changes later. 778 */ 779 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry); 780 n = dr; 781 goto insert; 782 } 783 splx(s); 784 return (dr); 785 } 786 787 /* entry does not exist */ 788 if (new->rtlifetime == 0) { 789 splx(s); 790 return (NULL); 791 } 792 793 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 794 if (n == NULL) { 795 splx(s); 796 return (NULL); 797 } 798 bzero(n, sizeof(*n)); 799 *n = *new; 800 801 insert: 802 /* 803 * Insert the new router in the Default Router List; 804 * The Default Router List should be in the descending order 805 * of router-preferece. Routers with the same preference are 806 * sorted in the arriving time order. 807 */ 808 809 /* insert at the end of the group */ 810 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 811 if (rtpref(n) > rtpref(dr)) 812 break; 813 } 814 if (dr) 815 TAILQ_INSERT_BEFORE(dr, n, dr_entry); 816 else 817 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry); 818 819 defrouter_select(); 820 821 splx(s); 822 823 return (n); 824 } 825 826 static struct nd_pfxrouter * 827 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 828 { 829 struct nd_pfxrouter *search; 830 831 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) { 832 if (search->router == dr) 833 break; 834 } 835 836 return (search); 837 } 838 839 static void 840 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 841 { 842 struct nd_pfxrouter *new; 843 844 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 845 if (new == NULL) 846 return; 847 bzero(new, sizeof(*new)); 848 new->router = dr; 849 850 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 851 852 pfxlist_onlink_check(); 853 } 854 855 static void 856 pfxrtr_del(struct nd_pfxrouter *pfr) 857 { 858 LIST_REMOVE(pfr, pfr_entry); 859 free(pfr, M_IP6NDP); 860 } 861 862 struct nd_prefix * 863 nd6_prefix_lookup(struct nd_prefixctl *key) 864 { 865 struct nd_prefix *search; 866 867 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) { 868 if (key->ndpr_ifp == search->ndpr_ifp && 869 key->ndpr_plen == search->ndpr_plen && 870 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr, 871 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) { 872 break; 873 } 874 } 875 876 return (search); 877 } 878 879 int 880 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr, 881 struct nd_prefix **newp) 882 { 883 struct nd_prefix *new = NULL; 884 int error = 0; 885 int i, s; 886 char ip6buf[INET6_ADDRSTRLEN]; 887 888 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 889 if (new == NULL) 890 return(ENOMEM); 891 bzero(new, sizeof(*new)); 892 new->ndpr_ifp = pr->ndpr_ifp; 893 new->ndpr_prefix = pr->ndpr_prefix; 894 new->ndpr_plen = pr->ndpr_plen; 895 new->ndpr_vltime = pr->ndpr_vltime; 896 new->ndpr_pltime = pr->ndpr_pltime; 897 new->ndpr_flags = pr->ndpr_flags; 898 if ((error = in6_init_prefix_ltimes(new)) != 0) { 899 free(new, M_IP6NDP); 900 return(error); 901 } 902 new->ndpr_lastupdate = time_second; 903 if (newp != NULL) 904 *newp = new; 905 906 /* initialization */ 907 LIST_INIT(&new->ndpr_advrtrs); 908 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 909 /* make prefix in the canonical form */ 910 for (i = 0; i < 4; i++) 911 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 912 new->ndpr_mask.s6_addr32[i]; 913 914 s = splnet(); 915 /* link ndpr_entry to nd_prefix list */ 916 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry); 917 splx(s); 918 919 /* ND_OPT_PI_FLAG_ONLINK processing */ 920 if (new->ndpr_raf_onlink) { 921 int e; 922 923 if ((e = nd6_prefix_onlink(new)) != 0) { 924 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 925 "the prefix %s/%d on-link on %s (errno=%d)\n", 926 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 927 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 928 /* proceed anyway. XXX: is it correct? */ 929 } 930 } 931 932 if (dr) 933 pfxrtr_add(new, dr); 934 935 return 0; 936 } 937 938 void 939 prelist_remove(struct nd_prefix *pr) 940 { 941 struct nd_pfxrouter *pfr, *next; 942 int e, s; 943 char ip6buf[INET6_ADDRSTRLEN]; 944 945 /* make sure to invalidate the prefix until it is really freed. */ 946 pr->ndpr_vltime = 0; 947 pr->ndpr_pltime = 0; 948 949 /* 950 * Though these flags are now meaningless, we'd rather keep the value 951 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users 952 * when executing "ndp -p". 953 */ 954 955 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && 956 (e = nd6_prefix_offlink(pr)) != 0) { 957 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 958 "on %s, errno=%d\n", 959 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 960 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 961 /* what should we do? */ 962 } 963 964 if (pr->ndpr_refcnt > 0) 965 return; /* notice here? */ 966 967 s = splnet(); 968 969 /* unlink ndpr_entry from nd_prefix list */ 970 LIST_REMOVE(pr, ndpr_entry); 971 972 /* free list of routers that adversed the prefix */ 973 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) { 974 free(pfr, M_IP6NDP); 975 } 976 splx(s); 977 978 free(pr, M_IP6NDP); 979 980 pfxlist_onlink_check(); 981 } 982 983 /* 984 * dr - may be NULL 985 */ 986 987 static int 988 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr, 989 struct mbuf *m, int mcast) 990 { 991 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 992 struct ifaddr *ifa; 993 struct ifnet *ifp = new->ndpr_ifp; 994 struct nd_prefix *pr; 995 int s = splnet(); 996 int error = 0; 997 int newprefix = 0; 998 int auth; 999 struct in6_addrlifetime lt6_tmp; 1000 char ip6buf[INET6_ADDRSTRLEN]; 1001 1002 auth = 0; 1003 if (m) { 1004 /* 1005 * Authenticity for NA consists authentication for 1006 * both IP header and IP datagrams, doesn't it ? 1007 */ 1008 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 1009 auth = ((m->m_flags & M_AUTHIPHDR) && 1010 (m->m_flags & M_AUTHIPDGM)); 1011 #endif 1012 } 1013 1014 if ((pr = nd6_prefix_lookup(new)) != NULL) { 1015 /* 1016 * nd6_prefix_lookup() ensures that pr and new have the same 1017 * prefix on a same interface. 1018 */ 1019 1020 /* 1021 * Update prefix information. Note that the on-link (L) bit 1022 * and the autonomous (A) bit should NOT be changed from 1 1023 * to 0. 1024 */ 1025 if (new->ndpr_raf_onlink == 1) 1026 pr->ndpr_raf_onlink = 1; 1027 if (new->ndpr_raf_auto == 1) 1028 pr->ndpr_raf_auto = 1; 1029 if (new->ndpr_raf_onlink) { 1030 pr->ndpr_vltime = new->ndpr_vltime; 1031 pr->ndpr_pltime = new->ndpr_pltime; 1032 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */ 1033 pr->ndpr_lastupdate = time_second; 1034 } 1035 1036 if (new->ndpr_raf_onlink && 1037 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1038 int e; 1039 1040 if ((e = nd6_prefix_onlink(pr)) != 0) { 1041 nd6log((LOG_ERR, 1042 "prelist_update: failed to make " 1043 "the prefix %s/%d on-link on %s " 1044 "(errno=%d)\n", 1045 ip6_sprintf(ip6buf, 1046 &pr->ndpr_prefix.sin6_addr), 1047 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 1048 /* proceed anyway. XXX: is it correct? */ 1049 } 1050 } 1051 1052 if (dr && pfxrtr_lookup(pr, dr) == NULL) 1053 pfxrtr_add(pr, dr); 1054 } else { 1055 struct nd_prefix *newpr = NULL; 1056 1057 newprefix = 1; 1058 1059 if (new->ndpr_vltime == 0) 1060 goto end; 1061 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 1062 goto end; 1063 1064 error = nd6_prelist_add(new, dr, &newpr); 1065 if (error != 0 || newpr == NULL) { 1066 nd6log((LOG_NOTICE, "prelist_update: " 1067 "nd6_prelist_add failed for %s/%d on %s " 1068 "errno=%d, returnpr=%p\n", 1069 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr), 1070 new->ndpr_plen, if_name(new->ndpr_ifp), 1071 error, newpr)); 1072 goto end; /* we should just give up in this case. */ 1073 } 1074 1075 /* 1076 * XXX: from the ND point of view, we can ignore a prefix 1077 * with the on-link bit being zero. However, we need a 1078 * prefix structure for references from autoconfigured 1079 * addresses. Thus, we explicitly make sure that the prefix 1080 * itself expires now. 1081 */ 1082 if (newpr->ndpr_raf_onlink == 0) { 1083 newpr->ndpr_vltime = 0; 1084 newpr->ndpr_pltime = 0; 1085 in6_init_prefix_ltimes(newpr); 1086 } 1087 1088 pr = newpr; 1089 } 1090 1091 /* 1092 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1093 * Note that pr must be non NULL at this point. 1094 */ 1095 1096 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1097 if (!new->ndpr_raf_auto) 1098 goto end; 1099 1100 /* 1101 * 5.5.3 (b). the link-local prefix should have been ignored in 1102 * nd6_ra_input. 1103 */ 1104 1105 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */ 1106 if (new->ndpr_pltime > new->ndpr_vltime) { 1107 error = EINVAL; /* XXX: won't be used */ 1108 goto end; 1109 } 1110 1111 /* 1112 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of 1113 * an address configured by stateless autoconfiguration already in the 1114 * list of addresses associated with the interface, and the Valid 1115 * Lifetime is not 0, form an address. We first check if we have 1116 * a matching prefix. 1117 * Note: we apply a clarification in rfc2462bis-02 here. We only 1118 * consider autoconfigured addresses while RFC2462 simply said 1119 * "address". 1120 */ 1121 IF_ADDR_RLOCK(ifp); 1122 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1123 struct in6_ifaddr *ifa6; 1124 u_int32_t remaininglifetime; 1125 1126 if (ifa->ifa_addr->sa_family != AF_INET6) 1127 continue; 1128 1129 ifa6 = (struct in6_ifaddr *)ifa; 1130 1131 /* 1132 * We only consider autoconfigured addresses as per rfc2462bis. 1133 */ 1134 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) 1135 continue; 1136 1137 /* 1138 * Spec is not clear here, but I believe we should concentrate 1139 * on unicast (i.e. not anycast) addresses. 1140 * XXX: other ia6_flags? detached or duplicated? 1141 */ 1142 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1143 continue; 1144 1145 /* 1146 * Ignore the address if it is not associated with a prefix 1147 * or is associated with a prefix that is different from this 1148 * one. (pr is never NULL here) 1149 */ 1150 if (ifa6->ia6_ndpr != pr) 1151 continue; 1152 1153 if (ia6_match == NULL) /* remember the first one */ 1154 ia6_match = ifa6; 1155 1156 /* 1157 * An already autoconfigured address matched. Now that we 1158 * are sure there is at least one matched address, we can 1159 * proceed to 5.5.3. (e): update the lifetimes according to the 1160 * "two hours" rule and the privacy extension. 1161 * We apply some clarifications in rfc2462bis: 1162 * - use remaininglifetime instead of storedlifetime as a 1163 * variable name 1164 * - remove the dead code in the "two-hour" rule 1165 */ 1166 #define TWOHOUR (120*60) 1167 lt6_tmp = ifa6->ia6_lifetime; 1168 1169 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1170 remaininglifetime = ND6_INFINITE_LIFETIME; 1171 else if (time_second - ifa6->ia6_updatetime > 1172 lt6_tmp.ia6t_vltime) { 1173 /* 1174 * The case of "invalid" address. We should usually 1175 * not see this case. 1176 */ 1177 remaininglifetime = 0; 1178 } else 1179 remaininglifetime = lt6_tmp.ia6t_vltime - 1180 (time_second - ifa6->ia6_updatetime); 1181 1182 /* when not updating, keep the current stored lifetime. */ 1183 lt6_tmp.ia6t_vltime = remaininglifetime; 1184 1185 if (TWOHOUR < new->ndpr_vltime || 1186 remaininglifetime < new->ndpr_vltime) { 1187 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1188 } else if (remaininglifetime <= TWOHOUR) { 1189 if (auth) { 1190 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1191 } 1192 } else { 1193 /* 1194 * new->ndpr_vltime <= TWOHOUR && 1195 * TWOHOUR < remaininglifetime 1196 */ 1197 lt6_tmp.ia6t_vltime = TWOHOUR; 1198 } 1199 1200 /* The 2 hour rule is not imposed for preferred lifetime. */ 1201 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1202 1203 in6_init_address_ltimes(pr, <6_tmp); 1204 1205 /* 1206 * We need to treat lifetimes for temporary addresses 1207 * differently, according to 1208 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1); 1209 * we only update the lifetimes when they are in the maximum 1210 * intervals. 1211 */ 1212 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 1213 u_int32_t maxvltime, maxpltime; 1214 1215 if (V_ip6_temp_valid_lifetime > 1216 (u_int32_t)((time_second - ifa6->ia6_createtime) + 1217 V_ip6_desync_factor)) { 1218 maxvltime = V_ip6_temp_valid_lifetime - 1219 (time_second - ifa6->ia6_createtime) - 1220 V_ip6_desync_factor; 1221 } else 1222 maxvltime = 0; 1223 if (V_ip6_temp_preferred_lifetime > 1224 (u_int32_t)((time_second - ifa6->ia6_createtime) + 1225 V_ip6_desync_factor)) { 1226 maxpltime = V_ip6_temp_preferred_lifetime - 1227 (time_second - ifa6->ia6_createtime) - 1228 V_ip6_desync_factor; 1229 } else 1230 maxpltime = 0; 1231 1232 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME || 1233 lt6_tmp.ia6t_vltime > maxvltime) { 1234 lt6_tmp.ia6t_vltime = maxvltime; 1235 } 1236 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME || 1237 lt6_tmp.ia6t_pltime > maxpltime) { 1238 lt6_tmp.ia6t_pltime = maxpltime; 1239 } 1240 } 1241 ifa6->ia6_lifetime = lt6_tmp; 1242 ifa6->ia6_updatetime = time_second; 1243 } 1244 IF_ADDR_RUNLOCK(ifp); 1245 if (ia6_match == NULL && new->ndpr_vltime) { 1246 int ifidlen; 1247 1248 /* 1249 * 5.5.3 (d) (continued) 1250 * No address matched and the valid lifetime is non-zero. 1251 * Create a new address. 1252 */ 1253 1254 /* 1255 * Prefix Length check: 1256 * If the sum of the prefix length and interface identifier 1257 * length does not equal 128 bits, the Prefix Information 1258 * option MUST be ignored. The length of the interface 1259 * identifier is defined in a separate link-type specific 1260 * document. 1261 */ 1262 ifidlen = in6_if2idlen(ifp); 1263 if (ifidlen < 0) { 1264 /* this should not happen, so we always log it. */ 1265 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n", 1266 if_name(ifp)); 1267 goto end; 1268 } 1269 if (ifidlen + pr->ndpr_plen != 128) { 1270 nd6log((LOG_INFO, 1271 "prelist_update: invalid prefixlen " 1272 "%d for %s, ignored\n", 1273 pr->ndpr_plen, if_name(ifp))); 1274 goto end; 1275 } 1276 1277 if ((ia6 = in6_ifadd(new, mcast)) != NULL) { 1278 /* 1279 * note that we should use pr (not new) for reference. 1280 */ 1281 pr->ndpr_refcnt++; 1282 ia6->ia6_ndpr = pr; 1283 1284 /* 1285 * RFC 3041 3.3 (2). 1286 * When a new public address is created as described 1287 * in RFC2462, also create a new temporary address. 1288 * 1289 * RFC 3041 3.5. 1290 * When an interface connects to a new link, a new 1291 * randomized interface identifier should be generated 1292 * immediately together with a new set of temporary 1293 * addresses. Thus, we specifiy 1 as the 2nd arg of 1294 * in6_tmpifadd(). 1295 */ 1296 if (V_ip6_use_tempaddr) { 1297 int e; 1298 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) { 1299 nd6log((LOG_NOTICE, "prelist_update: " 1300 "failed to create a temporary " 1301 "address, errno=%d\n", 1302 e)); 1303 } 1304 } 1305 ifa_free(&ia6->ia_ifa); 1306 1307 /* 1308 * A newly added address might affect the status 1309 * of other addresses, so we check and update it. 1310 * XXX: what if address duplication happens? 1311 */ 1312 pfxlist_onlink_check(); 1313 } else { 1314 /* just set an error. do not bark here. */ 1315 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1316 } 1317 } 1318 1319 end: 1320 splx(s); 1321 return error; 1322 } 1323 1324 /* 1325 * A supplement function used in the on-link detection below; 1326 * detect if a given prefix has a (probably) reachable advertising router. 1327 * XXX: lengthy function name... 1328 */ 1329 static struct nd_pfxrouter * 1330 find_pfxlist_reachable_router(struct nd_prefix *pr) 1331 { 1332 struct nd_pfxrouter *pfxrtr; 1333 struct llentry *ln; 1334 int canreach; 1335 1336 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) { 1337 IF_AFDATA_RLOCK(pfxrtr->router->ifp); 1338 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp); 1339 IF_AFDATA_RUNLOCK(pfxrtr->router->ifp); 1340 if (ln == NULL) 1341 continue; 1342 canreach = ND6_IS_LLINFO_PROBREACH(ln); 1343 LLE_RUNLOCK(ln); 1344 if (canreach) 1345 break; 1346 } 1347 return (pfxrtr); 1348 } 1349 1350 /* 1351 * Check if each prefix in the prefix list has at least one available router 1352 * that advertised the prefix (a router is "available" if its neighbor cache 1353 * entry is reachable or probably reachable). 1354 * If the check fails, the prefix may be off-link, because, for example, 1355 * we have moved from the network but the lifetime of the prefix has not 1356 * expired yet. So we should not use the prefix if there is another prefix 1357 * that has an available router. 1358 * But, if there is no prefix that has an available router, we still regards 1359 * all the prefixes as on-link. This is because we can't tell if all the 1360 * routers are simply dead or if we really moved from the network and there 1361 * is no router around us. 1362 */ 1363 void 1364 pfxlist_onlink_check() 1365 { 1366 struct nd_prefix *pr; 1367 struct in6_ifaddr *ifa; 1368 struct nd_defrouter *dr; 1369 struct nd_pfxrouter *pfxrtr = NULL; 1370 1371 /* 1372 * Check if there is a prefix that has a reachable advertising 1373 * router. 1374 */ 1375 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1376 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1377 break; 1378 } 1379 1380 /* 1381 * If we have no such prefix, check whether we still have a router 1382 * that does not advertise any prefixes. 1383 */ 1384 if (pr == NULL) { 1385 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 1386 struct nd_prefix *pr0; 1387 1388 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) { 1389 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL) 1390 break; 1391 } 1392 if (pfxrtr != NULL) 1393 break; 1394 } 1395 } 1396 if (pr != NULL || (!TAILQ_EMPTY(&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 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 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 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 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 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 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 static int 1552 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa) 1553 { 1554 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1555 struct radix_node_head *rnh; 1556 struct rtentry *rt; 1557 struct sockaddr_in6 mask6; 1558 u_long rtflags; 1559 int error, a_failure, fibnum; 1560 1561 /* 1562 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1563 * ifa->ifa_rtrequest = nd6_rtrequest; 1564 */ 1565 bzero(&mask6, sizeof(mask6)); 1566 mask6.sin6_len = sizeof(mask6); 1567 mask6.sin6_addr = pr->ndpr_mask; 1568 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP; 1569 1570 a_failure = 0; 1571 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 1572 1573 rt = NULL; 1574 error = in6_rtrequest(RTM_ADD, 1575 (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr, 1576 (struct sockaddr *)&mask6, rtflags, &rt, fibnum); 1577 if (error == 0) { 1578 KASSERT(rt != NULL, ("%s: in6_rtrequest return no " 1579 "error(%d) but rt is NULL, pr=%p, ifa=%p", __func__, 1580 error, pr, ifa)); 1581 1582 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6); 1583 /* XXX what if rhn == NULL? */ 1584 RADIX_NODE_HEAD_LOCK(rnh); 1585 RT_LOCK(rt); 1586 if (rt_setgate(rt, rt_key(rt), 1587 (struct sockaddr *)&null_sdl) == 0) { 1588 struct sockaddr_dl *dl; 1589 1590 dl = (struct sockaddr_dl *)rt->rt_gateway; 1591 dl->sdl_type = rt->rt_ifp->if_type; 1592 dl->sdl_index = rt->rt_ifp->if_index; 1593 } 1594 RADIX_NODE_HEAD_UNLOCK(rnh); 1595 nd6_rtmsg(RTM_ADD, rt); 1596 RT_UNLOCK(rt); 1597 pr->ndpr_stateflags |= NDPRF_ONLINK; 1598 } else { 1599 char ip6buf[INET6_ADDRSTRLEN]; 1600 char ip6bufg[INET6_ADDRSTRLEN]; 1601 char ip6bufm[INET6_ADDRSTRLEN]; 1602 struct sockaddr_in6 *sin6; 1603 1604 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1605 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add " 1606 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, " 1607 "flags=%lx errno = %d\n", 1608 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1609 pr->ndpr_plen, if_name(pr->ndpr_ifp), 1610 ip6_sprintf(ip6bufg, &sin6->sin6_addr), 1611 ip6_sprintf(ip6bufm, &mask6.sin6_addr), 1612 rtflags, error)); 1613 1614 /* Save last error to return, see rtinit(). */ 1615 a_failure = error; 1616 } 1617 1618 if (rt != NULL) { 1619 RT_LOCK(rt); 1620 RT_REMREF(rt); 1621 RT_UNLOCK(rt); 1622 } 1623 } 1624 1625 /* Return the last error we got. */ 1626 return (a_failure); 1627 } 1628 1629 static int 1630 nd6_prefix_onlink(struct nd_prefix *pr) 1631 { 1632 struct ifaddr *ifa; 1633 struct ifnet *ifp = pr->ndpr_ifp; 1634 struct nd_prefix *opr; 1635 int error = 0; 1636 char ip6buf[INET6_ADDRSTRLEN]; 1637 1638 /* sanity check */ 1639 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1640 nd6log((LOG_ERR, 1641 "nd6_prefix_onlink: %s/%d is already on-link\n", 1642 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1643 pr->ndpr_plen)); 1644 return (EEXIST); 1645 } 1646 1647 /* 1648 * Add the interface route associated with the prefix. Before 1649 * installing the route, check if there's the same prefix on another 1650 * interface, and the prefix has already installed the interface route. 1651 * Although such a configuration is expected to be rare, we explicitly 1652 * allow it. 1653 */ 1654 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { 1655 if (opr == pr) 1656 continue; 1657 1658 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1659 continue; 1660 1661 if (opr->ndpr_plen == pr->ndpr_plen && 1662 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1663 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) 1664 return (0); 1665 } 1666 1667 /* 1668 * We prefer link-local addresses as the associated interface address. 1669 */ 1670 /* search for a link-local addr */ 1671 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1672 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST); 1673 if (ifa == NULL) { 1674 /* XXX: freebsd does not have ifa_ifwithaf */ 1675 IF_ADDR_RLOCK(ifp); 1676 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1677 if (ifa->ifa_addr->sa_family == AF_INET6) 1678 break; 1679 } 1680 if (ifa != NULL) 1681 ifa_ref(ifa); 1682 IF_ADDR_RUNLOCK(ifp); 1683 /* should we care about ia6_flags? */ 1684 } 1685 if (ifa == NULL) { 1686 /* 1687 * This can still happen, when, for example, we receive an RA 1688 * containing a prefix with the L bit set and the A bit clear, 1689 * after removing all IPv6 addresses on the receiving 1690 * interface. This should, of course, be rare though. 1691 */ 1692 nd6log((LOG_NOTICE, 1693 "nd6_prefix_onlink: failed to find any ifaddr" 1694 " to add route for a prefix(%s/%d) on %s\n", 1695 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1696 pr->ndpr_plen, if_name(ifp))); 1697 return (0); 1698 } 1699 1700 error = nd6_prefix_onlink_rtrequest(pr, ifa); 1701 1702 if (ifa != NULL) 1703 ifa_free(ifa); 1704 1705 return (error); 1706 } 1707 1708 static int 1709 nd6_prefix_offlink(struct nd_prefix *pr) 1710 { 1711 int error = 0; 1712 struct ifnet *ifp = pr->ndpr_ifp; 1713 struct nd_prefix *opr; 1714 struct sockaddr_in6 sa6, mask6; 1715 struct rtentry *rt; 1716 char ip6buf[INET6_ADDRSTRLEN]; 1717 int fibnum, a_failure; 1718 1719 /* sanity check */ 1720 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1721 nd6log((LOG_ERR, 1722 "nd6_prefix_offlink: %s/%d is already off-link\n", 1723 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1724 pr->ndpr_plen)); 1725 return (EEXIST); 1726 } 1727 1728 bzero(&sa6, sizeof(sa6)); 1729 sa6.sin6_family = AF_INET6; 1730 sa6.sin6_len = sizeof(sa6); 1731 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1732 sizeof(struct in6_addr)); 1733 bzero(&mask6, sizeof(mask6)); 1734 mask6.sin6_family = AF_INET6; 1735 mask6.sin6_len = sizeof(sa6); 1736 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1737 1738 a_failure = 0; 1739 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 1740 rt = NULL; 1741 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1742 (struct sockaddr *)&mask6, 0, &rt, fibnum); 1743 if (error == 0) { 1744 /* report the route deletion to the routing socket. */ 1745 if (rt != NULL) 1746 nd6_rtmsg(RTM_DELETE, rt); 1747 } else { 1748 /* Save last error to return, see rtinit(). */ 1749 a_failure = error; 1750 } 1751 if (rt != NULL) { 1752 RTFREE(rt); 1753 } 1754 } 1755 error = a_failure; 1756 if (error == 0) { 1757 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1758 1759 /* 1760 * There might be the same prefix on another interface, 1761 * the prefix which could not be on-link just because we have 1762 * the interface route (see comments in nd6_prefix_onlink). 1763 * If there's one, try to make the prefix on-link on the 1764 * interface. 1765 */ 1766 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { 1767 if (opr == pr) 1768 continue; 1769 1770 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) 1771 continue; 1772 1773 /* 1774 * KAME specific: detached prefixes should not be 1775 * on-link. 1776 */ 1777 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1778 continue; 1779 1780 if (opr->ndpr_plen == pr->ndpr_plen && 1781 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1782 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { 1783 int e; 1784 1785 if ((e = nd6_prefix_onlink(opr)) != 0) { 1786 nd6log((LOG_ERR, 1787 "nd6_prefix_offlink: failed to " 1788 "recover a prefix %s/%d from %s " 1789 "to %s (errno = %d)\n", 1790 ip6_sprintf(ip6buf, 1791 &opr->ndpr_prefix.sin6_addr), 1792 opr->ndpr_plen, if_name(ifp), 1793 if_name(opr->ndpr_ifp), e)); 1794 } 1795 } 1796 } 1797 } else { 1798 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1799 nd6log((LOG_ERR, 1800 "nd6_prefix_offlink: failed to delete route: " 1801 "%s/%d on %s (errno = %d)\n", 1802 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen, 1803 if_name(ifp), error)); 1804 } 1805 1806 return (error); 1807 } 1808 1809 static struct in6_ifaddr * 1810 in6_ifadd(struct nd_prefixctl *pr, int mcast) 1811 { 1812 struct ifnet *ifp = pr->ndpr_ifp; 1813 struct ifaddr *ifa; 1814 struct in6_aliasreq ifra; 1815 struct in6_ifaddr *ia, *ib; 1816 int error, plen0; 1817 struct in6_addr mask; 1818 int prefixlen = pr->ndpr_plen; 1819 int updateflags; 1820 char ip6buf[INET6_ADDRSTRLEN]; 1821 1822 in6_prefixlen2mask(&mask, prefixlen); 1823 1824 /* 1825 * find a link-local address (will be interface ID). 1826 * Is it really mandatory? Theoretically, a global or a site-local 1827 * address can be configured without a link-local address, if we 1828 * have a unique interface identifier... 1829 * 1830 * it is not mandatory to have a link-local address, we can generate 1831 * interface identifier on the fly. we do this because: 1832 * (1) it should be the easiest way to find interface identifier. 1833 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1834 * for multiple addresses on a single interface, and possible shortcut 1835 * of DAD. we omitted DAD for this reason in the past. 1836 * (3) a user can prevent autoconfiguration of global address 1837 * by removing link-local address by hand (this is partly because we 1838 * don't have other way to control the use of IPv6 on an interface. 1839 * this has been our design choice - cf. NRL's "ifconfig auto"). 1840 * (4) it is easier to manage when an interface has addresses 1841 * with the same interface identifier, than to have multiple addresses 1842 * with different interface identifiers. 1843 */ 1844 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */ 1845 if (ifa) 1846 ib = (struct in6_ifaddr *)ifa; 1847 else 1848 return NULL; 1849 1850 /* prefixlen + ifidlen must be equal to 128 */ 1851 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1852 if (prefixlen != plen0) { 1853 ifa_free(ifa); 1854 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1855 "(prefix=%d ifid=%d)\n", 1856 if_name(ifp), prefixlen, 128 - plen0)); 1857 return NULL; 1858 } 1859 1860 /* make ifaddr */ 1861 1862 bzero(&ifra, sizeof(ifra)); 1863 /* 1864 * in6_update_ifa() does not use ifra_name, but we accurately set it 1865 * for safety. 1866 */ 1867 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1868 ifra.ifra_addr.sin6_family = AF_INET6; 1869 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1870 /* prefix */ 1871 ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr; 1872 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1873 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1874 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1875 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1876 1877 /* interface ID */ 1878 ifra.ifra_addr.sin6_addr.s6_addr32[0] |= 1879 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); 1880 ifra.ifra_addr.sin6_addr.s6_addr32[1] |= 1881 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); 1882 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1883 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); 1884 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1885 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); 1886 ifa_free(ifa); 1887 1888 /* new prefix mask. */ 1889 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1890 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1891 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1892 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1893 1894 /* lifetimes. */ 1895 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1896 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1897 1898 /* XXX: scope zone ID? */ 1899 1900 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1901 1902 /* 1903 * Make sure that we do not have this address already. This should 1904 * usually not happen, but we can still see this case, e.g., if we 1905 * have manually configured the exact address to be configured. 1906 */ 1907 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, 1908 &ifra.ifra_addr.sin6_addr); 1909 if (ifa != NULL) { 1910 ifa_free(ifa); 1911 /* this should be rare enough to make an explicit log */ 1912 log(LOG_INFO, "in6_ifadd: %s is already configured\n", 1913 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr)); 1914 return (NULL); 1915 } 1916 1917 /* 1918 * Allocate ifaddr structure, link into chain, etc. 1919 * If we are going to create a new address upon receiving a multicasted 1920 * RA, we need to impose a random delay before starting DAD. 1921 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2] 1922 */ 1923 updateflags = 0; 1924 if (mcast) 1925 updateflags |= IN6_IFAUPDATE_DADDELAY; 1926 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) { 1927 nd6log((LOG_ERR, 1928 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1929 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr), 1930 if_name(ifp), error)); 1931 return (NULL); /* ifaddr must not have been allocated. */ 1932 } 1933 1934 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1935 /* 1936 * XXXRW: Assumption of non-NULLness here might not be true with 1937 * fine-grained locking -- should we validate it? Or just return 1938 * earlier ifa rather than looking it up again? 1939 */ 1940 return (ia); /* this is always non-NULL and referenced. */ 1941 } 1942 1943 /* 1944 * ia0 - corresponding public address 1945 */ 1946 int 1947 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay) 1948 { 1949 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1950 struct in6_ifaddr *newia, *ia; 1951 struct in6_aliasreq ifra; 1952 int i, error; 1953 int trylimit = 3; /* XXX: adhoc value */ 1954 int updateflags; 1955 u_int32_t randid[2]; 1956 time_t vltime0, pltime0; 1957 1958 bzero(&ifra, sizeof(ifra)); 1959 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1960 ifra.ifra_addr = ia0->ia_addr; 1961 /* copy prefix mask */ 1962 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1963 /* clear the old IFID */ 1964 for (i = 0; i < 4; i++) { 1965 ifra.ifra_addr.sin6_addr.s6_addr32[i] &= 1966 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1967 } 1968 1969 again: 1970 if (in6_get_tmpifid(ifp, (u_int8_t *)randid, 1971 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) { 1972 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good " 1973 "random IFID\n")); 1974 return (EINVAL); 1975 } 1976 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1977 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1978 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1979 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1980 1981 /* 1982 * in6_get_tmpifid() quite likely provided a unique interface ID. 1983 * However, we may still have a chance to see collision, because 1984 * there may be a time lag between generation of the ID and generation 1985 * of the address. So, we'll do one more sanity check. 1986 */ 1987 IN6_IFADDR_RLOCK(); 1988 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1989 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1990 &ifra.ifra_addr.sin6_addr)) { 1991 if (trylimit-- == 0) { 1992 IN6_IFADDR_RUNLOCK(); 1993 /* 1994 * Give up. Something strange should have 1995 * happened. 1996 */ 1997 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to " 1998 "find a unique random IFID\n")); 1999 return (EEXIST); 2000 } 2001 IN6_IFADDR_RUNLOCK(); 2002 forcegen = 1; 2003 goto again; 2004 } 2005 } 2006 IN6_IFADDR_RUNLOCK(); 2007 2008 /* 2009 * The Valid Lifetime is the lower of the Valid Lifetime of the 2010 * public address or TEMP_VALID_LIFETIME. 2011 * The Preferred Lifetime is the lower of the Preferred Lifetime 2012 * of the public address or TEMP_PREFERRED_LIFETIME - 2013 * DESYNC_FACTOR. 2014 */ 2015 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 2016 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 2017 (ia0->ia6_lifetime.ia6t_vltime - 2018 (time_second - ia0->ia6_updatetime)); 2019 if (vltime0 > V_ip6_temp_valid_lifetime) 2020 vltime0 = V_ip6_temp_valid_lifetime; 2021 } else 2022 vltime0 = V_ip6_temp_valid_lifetime; 2023 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 2024 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 2025 (ia0->ia6_lifetime.ia6t_pltime - 2026 (time_second - ia0->ia6_updatetime)); 2027 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){ 2028 pltime0 = V_ip6_temp_preferred_lifetime - 2029 V_ip6_desync_factor; 2030 } 2031 } else 2032 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor; 2033 ifra.ifra_lifetime.ia6t_vltime = vltime0; 2034 ifra.ifra_lifetime.ia6t_pltime = pltime0; 2035 2036 /* 2037 * A temporary address is created only if this calculated Preferred 2038 * Lifetime is greater than REGEN_ADVANCE time units. 2039 */ 2040 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance) 2041 return (0); 2042 2043 /* XXX: scope zone ID? */ 2044 2045 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 2046 2047 /* allocate ifaddr structure, link into chain, etc. */ 2048 updateflags = 0; 2049 if (delay) 2050 updateflags |= IN6_IFAUPDATE_DADDELAY; 2051 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) 2052 return (error); 2053 2054 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 2055 if (newia == NULL) { /* XXX: can it happen? */ 2056 nd6log((LOG_ERR, 2057 "in6_tmpifadd: ifa update succeeded, but we got " 2058 "no ifaddr\n")); 2059 return (EINVAL); /* XXX */ 2060 } 2061 newia->ia6_ndpr = ia0->ia6_ndpr; 2062 newia->ia6_ndpr->ndpr_refcnt++; 2063 ifa_free(&newia->ia_ifa); 2064 2065 /* 2066 * A newly added address might affect the status of other addresses. 2067 * XXX: when the temporary address is generated with a new public 2068 * address, the onlink check is redundant. However, it would be safe 2069 * to do the check explicitly everywhere a new address is generated, 2070 * and, in fact, we surely need the check when we create a new 2071 * temporary address due to deprecation of an old temporary address. 2072 */ 2073 pfxlist_onlink_check(); 2074 2075 return (0); 2076 } 2077 2078 static int 2079 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 2080 { 2081 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 2082 ndpr->ndpr_preferred = 0; 2083 else 2084 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 2085 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 2086 ndpr->ndpr_expire = 0; 2087 else 2088 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 2089 2090 return 0; 2091 } 2092 2093 static void 2094 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 2095 { 2096 /* init ia6t_expire */ 2097 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 2098 lt6->ia6t_expire = 0; 2099 else { 2100 lt6->ia6t_expire = time_second; 2101 lt6->ia6t_expire += lt6->ia6t_vltime; 2102 } 2103 2104 /* init ia6t_preferred */ 2105 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 2106 lt6->ia6t_preferred = 0; 2107 else { 2108 lt6->ia6t_preferred = time_second; 2109 lt6->ia6t_preferred += lt6->ia6t_pltime; 2110 } 2111 } 2112 2113 /* 2114 * Delete all the routing table entries that use the specified gateway. 2115 * XXX: this function causes search through all entries of routing table, so 2116 * it shouldn't be called when acting as a router. 2117 */ 2118 void 2119 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 2120 { 2121 struct radix_node_head *rnh; 2122 u_int fibnum; 2123 int s = splnet(); 2124 2125 /* We'll care only link-local addresses */ 2126 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 2127 splx(s); 2128 return; 2129 } 2130 2131 /* XXX Do we really need to walk any but the default FIB? */ 2132 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 2133 rnh = rt_tables_get_rnh(fibnum, AF_INET6); 2134 if (rnh == NULL) 2135 continue; 2136 2137 RADIX_NODE_HEAD_LOCK(rnh); 2138 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 2139 RADIX_NODE_HEAD_UNLOCK(rnh); 2140 } 2141 splx(s); 2142 } 2143 2144 static int 2145 rt6_deleteroute(struct radix_node *rn, void *arg) 2146 { 2147 #define SIN6(s) ((struct sockaddr_in6 *)s) 2148 struct rtentry *rt = (struct rtentry *)rn; 2149 struct in6_addr *gate = (struct in6_addr *)arg; 2150 2151 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 2152 return (0); 2153 2154 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) { 2155 return (0); 2156 } 2157 2158 /* 2159 * Do not delete a static route. 2160 * XXX: this seems to be a bit ad-hoc. Should we consider the 2161 * 'cloned' bit instead? 2162 */ 2163 if ((rt->rt_flags & RTF_STATIC) != 0) 2164 return (0); 2165 2166 /* 2167 * We delete only host route. This means, in particular, we don't 2168 * delete default route. 2169 */ 2170 if ((rt->rt_flags & RTF_HOST) == 0) 2171 return (0); 2172 2173 return (in6_rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 2174 rt_mask(rt), rt->rt_flags, NULL, rt->rt_fibnum)); 2175 #undef SIN6 2176 } 2177 2178 int 2179 nd6_setdefaultiface(int ifindex) 2180 { 2181 int error = 0; 2182 2183 if (ifindex < 0 || V_if_index < ifindex) 2184 return (EINVAL); 2185 if (ifindex != 0 && !ifnet_byindex(ifindex)) 2186 return (EINVAL); 2187 2188 if (V_nd6_defifindex != ifindex) { 2189 V_nd6_defifindex = ifindex; 2190 if (V_nd6_defifindex > 0) 2191 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex); 2192 else 2193 V_nd6_defifp = NULL; 2194 2195 /* 2196 * Our current implementation assumes one-to-one maping between 2197 * interfaces and links, so it would be natural to use the 2198 * default interface as the default link. 2199 */ 2200 scope6_setdefault(V_nd6_defifp); 2201 } 2202 2203 return (error); 2204 }
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