nd6_rtr.c revision 64541
1/* $FreeBSD: head/sys/netinet6/nd6_rtr.c 64541 2000-08-11 12:29:04Z itojun $ */ 2/* $KAME: nd6_rtr.c,v 1.47 2000/08/08 08:58:42 jinmei Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include "opt_inet.h" 34#include "opt_inet6.h" 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/malloc.h> 39#include <sys/mbuf.h> 40#include <sys/socket.h> 41#include <sys/sockio.h> 42#include <sys/time.h> 43#include <sys/errno.h> 44#include <sys/syslog.h> 45 46#include <net/if.h> 47#include <net/if_types.h> 48#include <net/if_dl.h> 49#include <net/route.h> 50#include <net/radix.h> 51 52#include <netinet/in.h> 53#include <netinet6/in6_var.h> 54#include <netinet/ip6.h> 55#include <netinet6/ip6_var.h> 56#include <netinet6/nd6.h> 57#include <netinet/icmp6.h> 58#include <netinet6/scope6_var.h> 59 60#include <net/net_osdep.h> 61 62#define SDL(s) ((struct sockaddr_dl *)s) 63 64static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *)); 65static int prelist_add __P((struct nd_prefix *, struct nd_defrouter *)); 66static struct nd_prefix *prefix_lookup __P((struct nd_prefix *)); 67static struct in6_ifaddr *in6_ifadd __P((struct ifnet *, struct in6_addr *, 68 struct in6_addr *, int)); 69static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *, 70 struct nd_defrouter *)); 71static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *)); 72static void pfxrtr_del __P((struct nd_pfxrouter *)); 73static struct nd_pfxrouter *find_pfxlist_reachable_router 74 __P((struct nd_prefix *)); 75static void nd6_detach_prefix __P((struct nd_prefix *)); 76static void nd6_attach_prefix __P((struct nd_prefix *)); 77static void defrouter_addifreq __P((struct ifnet *)); 78#ifdef ND6_USE_RTSOCK 79static void defrouter_msg __P((int, struct rtentry *)); 80#endif 81 82static void in6_init_address_ltimes __P((struct nd_prefix *ndpr, 83 struct in6_addrlifetime *lt6, 84 int update_vltime)); 85 86static int rt6_deleteroute __P((struct radix_node *, void *)); 87 88extern int nd6_recalc_reachtm_interval; 89 90struct ifnet *nd6_defifp; 91int nd6_defifindex; 92 93/* 94 * Receive Router Solicitation Message - just for routers. 95 * Router solicitation/advertisement is mostly managed by userland program 96 * (rtadvd) so here we have no function like nd6_ra_output(). 97 * 98 * Based on RFC 2461 99 */ 100void 101nd6_rs_input(m, off, icmp6len) 102 struct mbuf *m; 103 int off, icmp6len; 104{ 105 struct ifnet *ifp = m->m_pkthdr.rcvif; 106 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 107 struct nd_router_solicit *nd_rs; 108 struct in6_addr saddr6 = ip6->ip6_src; 109#if 0 110 struct in6_addr daddr6 = ip6->ip6_dst; 111#endif 112 char *lladdr = NULL; 113 int lladdrlen = 0; 114#if 0 115 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL; 116 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; 117 struct rtentry *rt = NULL; 118 int is_newentry; 119#endif 120 union nd_opts ndopts; 121 122 /* If I'm not a router, ignore it. */ 123 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) 124 goto freeit; 125 126 /* Sanity checks */ 127 if (ip6->ip6_hlim != 255) { 128 log(LOG_ERR, 129 "nd6_rs_input: invalid hlim %d\n", ip6->ip6_hlim); 130 goto freeit; 131 } 132 133 /* 134 * Don't update the neighbor cache, if src = ::. 135 * This indicates that the src has no IP address assigned yet. 136 */ 137 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 138 goto freeit; 139 140#ifndef PULLDOWN_TEST 141 IP6_EXTHDR_CHECK(m, off, icmp6len,); 142 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 143#else 144 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 145 if (nd_rs == NULL) { 146 icmp6stat.icp6s_tooshort++; 147 return; 148 } 149#endif 150 151 icmp6len -= sizeof(*nd_rs); 152 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 153 if (nd6_options(&ndopts) < 0) { 154 log(LOG_INFO, "nd6_rs_input: invalid ND option, ignored\n"); 155 goto freeit; 156 } 157 158 if (ndopts.nd_opts_src_lladdr) { 159 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 160 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 161 } 162 163 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 164 log(LOG_INFO, 165 "nd6_rs_input: lladdrlen mismatch for %s " 166 "(if %d, RS packet %d)\n", 167 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2); 168 } 169 170 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 171 172 freeit: 173 m_freem(m); 174} 175 176/* 177 * Receive Router Advertisement Message. 178 * 179 * Based on RFC 2461 180 * TODO: on-link bit on prefix information 181 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 182 */ 183void 184nd6_ra_input(m, off, icmp6len) 185 struct mbuf *m; 186 int off, icmp6len; 187{ 188 struct ifnet *ifp = m->m_pkthdr.rcvif; 189 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 190 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 191 struct nd_router_advert *nd_ra; 192 struct in6_addr saddr6 = ip6->ip6_src; 193#if 0 194 struct in6_addr daddr6 = ip6->ip6_dst; 195 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 196 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 197 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 198#endif 199 union nd_opts ndopts; 200 struct nd_defrouter *dr; 201 202 if (ip6_accept_rtadv == 0) 203 goto freeit; 204 205 if (ip6->ip6_hlim != 255) { 206 log(LOG_ERR, 207 "nd6_ra_input: invalid hlim %d\n", ip6->ip6_hlim); 208 goto freeit; 209 } 210 211 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 212 log(LOG_ERR, 213 "nd6_ra_input: src %s is not link-local\n", 214 ip6_sprintf(&saddr6)); 215 goto freeit; 216 } 217 218#ifndef PULLDOWN_TEST 219 IP6_EXTHDR_CHECK(m, off, icmp6len,); 220 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 221#else 222 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 223 if (nd_ra == NULL) { 224 icmp6stat.icp6s_tooshort++; 225 return; 226 } 227#endif 228 229 icmp6len -= sizeof(*nd_ra); 230 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 231 if (nd6_options(&ndopts) < 0) { 232 log(LOG_INFO, "nd6_ra_input: invalid ND option, ignored\n"); 233 goto freeit; 234 } 235 236 { 237 struct nd_defrouter dr0; 238 u_int32_t advreachable = nd_ra->nd_ra_reachable; 239 240 dr0.rtaddr = saddr6; 241 dr0.flags = nd_ra->nd_ra_flags_reserved; 242 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 243 dr0.expire = time_second + dr0.rtlifetime; 244 dr0.ifp = ifp; 245 dr0.advint = 0; /* Mobile IPv6 */ 246 dr0.advint_expire = 0; /* Mobile IPv6 */ 247 dr0.advints_lost = 0; /* Mobile IPv6 */ 248 /* unspecified or not? (RFC 2461 6.3.4) */ 249 if (advreachable) { 250 NTOHL(advreachable); 251 if (advreachable <= MAX_REACHABLE_TIME && 252 ndi->basereachable != advreachable) { 253 ndi->basereachable = advreachable; 254 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 255 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 256 } 257 } 258 if (nd_ra->nd_ra_retransmit) 259 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 260 if (nd_ra->nd_ra_curhoplimit) 261 ndi->chlim = nd_ra->nd_ra_curhoplimit; 262 dr = defrtrlist_update(&dr0); 263 } 264 265 /* 266 * prefix 267 */ 268 if (ndopts.nd_opts_pi) { 269 struct nd_opt_hdr *pt; 270 struct nd_opt_prefix_info *pi; 271 struct nd_prefix pr; 272 273 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 274 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 275 pt = (struct nd_opt_hdr *)((caddr_t)pt + 276 (pt->nd_opt_len << 3))) { 277 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 278 continue; 279 pi = (struct nd_opt_prefix_info *)pt; 280 281 if (pi->nd_opt_pi_len != 4) { 282 log(LOG_INFO, "nd6_ra_input: invalid option " 283 "len %d for prefix information option, " 284 "ignored\n", pi->nd_opt_pi_len); 285 continue; 286 } 287 288 if (128 < pi->nd_opt_pi_prefix_len) { 289 log(LOG_INFO, "nd6_ra_input: invalid prefix " 290 "len %d for prefix information option, " 291 "ignored\n", pi->nd_opt_pi_prefix_len); 292 continue; 293 } 294 295 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 296 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 297 log(LOG_INFO, "nd6_ra_input: invalid prefix " 298 "%s, ignored\n", 299 ip6_sprintf(&pi->nd_opt_pi_prefix)); 300 continue; 301 } 302 303 /* aggregatable unicast address, rfc2374 */ 304 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 305 && pi->nd_opt_pi_prefix_len != 64) { 306 log(LOG_INFO, "nd6_ra_input: invalid prefixlen " 307 "%d for rfc2374 prefix %s, ignored\n", 308 pi->nd_opt_pi_prefix_len, 309 ip6_sprintf(&pi->nd_opt_pi_prefix)); 310 continue; 311 } 312 313 bzero(&pr, sizeof(pr)); 314 pr.ndpr_prefix.sin6_family = AF_INET6; 315 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 316 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 317 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 318 319 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 320 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 321 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 322 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 323 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 324 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 325 pr.ndpr_pltime = 326 ntohl(pi->nd_opt_pi_preferred_time); 327 328 if (in6_init_prefix_ltimes(&pr)) 329 continue; /* prefix lifetime init failed */ 330 331 (void)prelist_update(&pr, dr, m); 332 } 333 } 334 335 /* 336 * MTU 337 */ 338 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 339 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 340 341 /* lower bound */ 342 if (mtu < IPV6_MMTU) { 343 log(LOG_INFO, "nd6_ra_input: bogus mtu option " 344 "mtu=%d sent from %s, ignoring\n", 345 mtu, ip6_sprintf(&ip6->ip6_src)); 346 goto skip; 347 } 348 349 /* upper bound */ 350 if (ndi->maxmtu) { 351 if (mtu <= ndi->maxmtu) { 352 int change = (ndi->linkmtu != mtu); 353 354 ndi->linkmtu = mtu; 355 if (change) /* in6_maxmtu may change */ 356 in6_setmaxmtu(); 357 } else { 358 log(LOG_INFO, "nd6_ra_input: bogus mtu " 359 "mtu=%d sent from %s; " 360 "exceeds maxmtu %d, ignoring\n", 361 mtu, ip6_sprintf(&ip6->ip6_src), 362 ndi->maxmtu); 363 } 364 } else { 365 log(LOG_INFO, "nd6_ra_input: mtu option " 366 "mtu=%d sent from %s; maxmtu unknown, " 367 "ignoring\n", 368 mtu, ip6_sprintf(&ip6->ip6_src)); 369 } 370 } 371 372 skip: 373 374 /* 375 * Src linkaddress 376 */ 377 { 378 char *lladdr = NULL; 379 int lladdrlen = 0; 380 381 if (ndopts.nd_opts_src_lladdr) { 382 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 383 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 384 } 385 386 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 387 log(LOG_INFO, 388 "nd6_ra_input: lladdrlen mismatch for %s " 389 "(if %d, RA packet %d)\n", 390 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2); 391 } 392 393 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 394 395 /* 396 * Installing a link-layer address might change the state of the 397 * router's neighbor cache, which might also affect our on-link 398 * detection of adveritsed prefixes. 399 */ 400 pfxlist_onlink_check(); 401 } 402 403freeit: 404 m_freem(m); 405} 406 407/* 408 * default router list proccessing sub routines 409 */ 410 411#ifdef ND6_USE_RTSOCK 412/* tell the change to user processes watching the routing socket. */ 413static void 414defrouter_msg(cmd, rt) 415 int cmd; 416 struct rtentry *rt; 417{ 418 struct rt_addrinfo info; 419 420 bzero((caddr_t)&info, sizeof(info)); 421 info.rti_info[RTAX_DST] = rt_key(rt); 422 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 423 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 424 425 rt_missmsg(cmd, &info, rt->rt_flags, 0); 426} 427#endif 428 429void 430defrouter_addreq(new) 431 struct nd_defrouter *new; 432{ 433 struct sockaddr_in6 def, mask, gate; 434 struct rtentry *newrt = NULL; 435 int s; 436 437 Bzero(&def, sizeof(def)); 438 Bzero(&mask, sizeof(mask)); 439 Bzero(&gate, sizeof(gate)); 440 441 def.sin6_len = mask.sin6_len = gate.sin6_len 442 = sizeof(struct sockaddr_in6); 443 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 444 gate.sin6_addr = new->rtaddr; 445 446 s = splnet(); 447 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, 448 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 449 RTF_GATEWAY, &newrt); 450 if (newrt) { 451#ifdef ND6_USE_RTSOCK 452 defrouter_msg(RTM_ADD, newrt); /* tell user process */ 453#endif 454 newrt->rt_refcnt--; 455 } 456 splx(s); 457 return; 458} 459 460/* Add a route to a given interface as default */ 461void 462defrouter_addifreq(ifp) 463 struct ifnet *ifp; 464{ 465 struct sockaddr_in6 def, mask; 466 struct ifaddr *ifa; 467 struct rtentry *newrt = NULL; 468 int error, flags; 469 470 bzero(&def, sizeof(def)); 471 bzero(&mask, sizeof(mask)); 472 473 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 474 def.sin6_family = mask.sin6_family = AF_INET6; 475 476 /* 477 * Search for an ifaddr beloging to the specified interface. 478 * XXX: An IPv6 address are required to be assigned on the interface. 479 */ 480 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 481 log(LOG_ERR, /* better error? */ 482 "defrouter_addifreq: failed to find an ifaddr " 483 "to install a route to interface %s\n", 484 if_name(ifp)); 485 return; 486 } 487 488 flags = ifa->ifa_flags; 489 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) 490 flags &= ~RTF_CLONING; 491 if ((error = rtrequest(RTM_ADD, (struct sockaddr *)&def, 492 ifa->ifa_addr, (struct sockaddr *)&mask, 493 flags, &newrt)) != 0) { 494 log(LOG_ERR, 495 "defrouter_addifreq: failed to install a route to " 496 "interface %s (errno = %d)\n", 497 if_name(ifp), error); 498 499 if (newrt) /* maybe unnecessary, but do it for safety */ 500 newrt->rt_refcnt--; 501 } else { 502 if (newrt) { 503#ifdef ND6_USE_RTSOCK 504 defrouter_msg(RTM_ADD, newrt); 505#endif 506 newrt->rt_refcnt--; 507 } 508 } 509} 510 511struct nd_defrouter * 512defrouter_lookup(addr, ifp) 513 struct in6_addr *addr; 514 struct ifnet *ifp; 515{ 516 struct nd_defrouter *dr; 517 518 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 519 dr = TAILQ_NEXT(dr, dr_entry)) { 520 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 521 return(dr); 522 } 523 524 return(NULL); /* search failed */ 525} 526 527void 528defrouter_delreq(dr, dofree) 529 struct nd_defrouter *dr; 530 int dofree; 531{ 532 struct sockaddr_in6 def, mask, gate; 533 struct rtentry *oldrt = NULL; 534 535 Bzero(&def, sizeof(def)); 536 Bzero(&mask, sizeof(mask)); 537 Bzero(&gate, sizeof(gate)); 538 539 def.sin6_len = mask.sin6_len = gate.sin6_len 540 = sizeof(struct sockaddr_in6); 541 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 542 gate.sin6_addr = dr->rtaddr; 543 544 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 545 (struct sockaddr *)&gate, 546 (struct sockaddr *)&mask, 547 RTF_GATEWAY, &oldrt); 548 if (oldrt) { 549#ifdef ND6_USE_RTSOCK 550 defrouter_msg(RTM_DELETE, oldrt); 551#endif 552 if (oldrt->rt_refcnt <= 0) { 553 /* 554 * XXX: borrowed from the RTM_DELETE case of 555 * rtrequest(). 556 */ 557 oldrt->rt_refcnt++; 558 rtfree(oldrt); 559 } 560 } 561 562 if (dofree) /* XXX: necessary? */ 563 free(dr, M_IP6NDP); 564} 565 566void 567defrtrlist_del(dr) 568 struct nd_defrouter *dr; 569{ 570 struct nd_defrouter *deldr = NULL; 571 struct nd_prefix *pr; 572 573 /* 574 * Flush all the routing table entries that use the router 575 * as a next hop. 576 */ 577 if (!ip6_forwarding && ip6_accept_rtadv) { 578 /* above is a good condition? */ 579 rt6_flush(&dr->rtaddr, dr->ifp); 580 } 581 582 if (dr == TAILQ_FIRST(&nd_defrouter)) 583 deldr = dr; /* The router is primary. */ 584 585 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 586 587 /* 588 * Also delete all the pointers to the router in each prefix lists. 589 */ 590 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 591 struct nd_pfxrouter *pfxrtr; 592 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 593 pfxrtr_del(pfxrtr); 594 } 595 pfxlist_onlink_check(); 596 597 /* 598 * If the router is the primary one, choose a new one. 599 * Note that defrouter_select() will remove the current gateway 600 * from the routing table. 601 */ 602 if (deldr) 603 defrouter_select(); 604 605 free(dr, M_IP6NDP); 606} 607 608/* 609 * Default Router Selection according to Section 6.3.6 of RFC 2461: 610 * 1) Routers that are reachable or probably reachable should be 611 * preferred. 612 * 2) When no routers on the list are known to be reachable or 613 * probably reachable, routers SHOULD be selected in a round-robin 614 * fashion. 615 * 3) If the Default Router List is empty, assume that all 616 * destinations are on-link. 617 */ 618void 619defrouter_select() 620{ 621 int s = splnet(); 622 struct nd_defrouter *dr, anydr; 623 struct rtentry *rt = NULL; 624 struct llinfo_nd6 *ln = NULL; 625 626 /* 627 * Search for a (probably) reachable router from the list. 628 */ 629 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 630 dr = TAILQ_NEXT(dr, dr_entry)) { 631 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 632 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 633 ND6_IS_LLINFO_PROBREACH(ln)) { 634 /* Got it, and move it to the head */ 635 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 636 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 637 break; 638 } 639 } 640 641 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 642 /* 643 * De-install the previous default gateway and install 644 * a new one. 645 * Note that if there is no reachable router in the list, 646 * the head entry will be used anyway. 647 * XXX: do we have to check the current routing table entry? 648 */ 649 bzero(&anydr, sizeof(anydr)); 650 defrouter_delreq(&anydr, 0); 651 defrouter_addreq(dr); 652 } 653 else { 654 /* 655 * The Default Router List is empty, so install the default 656 * route to an inteface. 657 * XXX: The specification does not say this mechanism should 658 * be restricted to hosts, but this would be not useful 659 * (even harmful) for routers. 660 */ 661 if (!ip6_forwarding) { 662 /* 663 * De-install the current default route 664 * in advance. 665 */ 666 bzero(&anydr, sizeof(anydr)); 667 defrouter_delreq(&anydr, 0); 668 if (nd6_defifp) { 669 /* 670 * Install a route to the default interface 671 * as default route. 672 */ 673 defrouter_addifreq(nd6_defifp); 674 } 675#ifdef ND6_DEBUG 676 else /* noisy log? */ 677 log(LOG_INFO, "defrouter_select: " 678 "there's no default router and no default" 679 " interface\n"); 680#endif 681 } 682 } 683 684 splx(s); 685 return; 686} 687 688static struct nd_defrouter * 689defrtrlist_update(new) 690 struct nd_defrouter *new; 691{ 692 struct nd_defrouter *dr, *n; 693 int s = splnet(); 694 695 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 696 /* entry exists */ 697 if (new->rtlifetime == 0) { 698 defrtrlist_del(dr); 699 dr = NULL; 700 } else { 701 /* override */ 702 dr->flags = new->flags; /* xxx flag check */ 703 dr->rtlifetime = new->rtlifetime; 704 dr->expire = new->expire; 705 } 706 splx(s); 707 return(dr); 708 } 709 710 /* entry does not exist */ 711 if (new->rtlifetime == 0) { 712 splx(s); 713 return(NULL); 714 } 715 716 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 717 if (n == NULL) { 718 splx(s); 719 return(NULL); 720 } 721 bzero(n, sizeof(*n)); 722 *n = *new; 723 724 /* 725 * Insert the new router at the end of the Default Router List. 726 * If there is no other router, install it anyway. Otherwise, 727 * just continue to use the current default router. 728 */ 729 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 730 if (TAILQ_FIRST(&nd_defrouter) == n) 731 defrouter_select(); 732 splx(s); 733 734 return(n); 735} 736 737static struct nd_pfxrouter * 738pfxrtr_lookup(pr, dr) 739 struct nd_prefix *pr; 740 struct nd_defrouter *dr; 741{ 742 struct nd_pfxrouter *search; 743 744 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 745 if (search->router == dr) 746 break; 747 } 748 749 return(search); 750} 751 752static void 753pfxrtr_add(pr, dr) 754 struct nd_prefix *pr; 755 struct nd_defrouter *dr; 756{ 757 struct nd_pfxrouter *new; 758 759 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 760 if (new == NULL) 761 return; 762 bzero(new, sizeof(*new)); 763 new->router = dr; 764 765 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 766 767 pfxlist_onlink_check(); 768} 769 770static void 771pfxrtr_del(pfr) 772 struct nd_pfxrouter *pfr; 773{ 774 LIST_REMOVE(pfr, pfr_entry); 775 free(pfr, M_IP6NDP); 776} 777 778static struct nd_prefix * 779prefix_lookup(pr) 780 struct nd_prefix *pr; 781{ 782 struct nd_prefix *search; 783 784 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 785 if (pr->ndpr_ifp == search->ndpr_ifp && 786 pr->ndpr_plen == search->ndpr_plen && 787 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 788 &search->ndpr_prefix.sin6_addr, 789 pr->ndpr_plen) 790 ) { 791 break; 792 } 793 } 794 795 return(search); 796} 797 798static int 799prelist_add(pr, dr) 800 struct nd_prefix *pr; 801 struct nd_defrouter *dr; 802{ 803 struct nd_prefix *new; 804 int i, s; 805 806 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 807 if (new == NULL) 808 return ENOMEM; 809 bzero(new, sizeof(*new)); 810 *new = *pr; 811 812 /* initilization */ 813 new->ndpr_statef_onlink = pr->ndpr_statef_onlink; 814 LIST_INIT(&new->ndpr_advrtrs); 815 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 816 /* make prefix in the canonical form */ 817 for (i = 0; i < 4; i++) 818 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 819 new->ndpr_mask.s6_addr32[i]; 820 821 /* xxx ND_OPT_PI_FLAG_ONLINK processing */ 822 823 s = splnet(); 824 /* link ndpr_entry to nd_prefix list */ 825 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 826 splx(s); 827 828 if (dr) { 829 pfxrtr_add(new, dr); 830 } 831 832 return 0; 833} 834 835void 836prelist_remove(pr) 837 struct nd_prefix *pr; 838{ 839 struct nd_pfxrouter *pfr, *next; 840 int s; 841 842 s = splnet(); 843 /* unlink ndpr_entry from nd_prefix list */ 844 LIST_REMOVE(pr, ndpr_entry); 845 splx(s); 846 847 /* free list of routers that adversed the prefix */ 848 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 849 next = pfr->pfr_next; 850 851 free(pfr, M_IP6NDP); 852 } 853 free(pr, M_IP6NDP); 854 855 pfxlist_onlink_check(); 856} 857 858/* 859 * NOTE: We set address lifetime to keep 860 * address lifetime <= prefix lifetime 861 * invariant. This is to simplify on-link determination code. 862 * If onlink determination is udated, this routine may have to be updated too. 863 */ 864int 865prelist_update(new, dr, m) 866 struct nd_prefix *new; 867 struct nd_defrouter *dr; /* may be NULL */ 868 struct mbuf *m; 869{ 870 struct in6_ifaddr *ia6 = NULL; 871 struct nd_prefix *pr; 872 int s = splnet(); 873 int error = 0; 874 int auth; 875 struct in6_addrlifetime *lt6; 876 u_char onlink; /* Mobile IPv6 */ 877 878 auth = 0; 879 if (m) { 880 /* 881 * Authenticity for NA consists authentication for 882 * both IP header and IP datagrams, doesn't it ? 883 */ 884#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 885 auth = (m->m_flags & M_AUTHIPHDR 886 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 887#endif 888 } 889 890 if ((pr = prefix_lookup(new)) != NULL) { 891 if (pr->ndpr_ifp != new->ndpr_ifp) { 892 error = EADDRNOTAVAIL; 893 goto end; 894 } 895 896 /* update prefix information */ 897 pr->ndpr_flags = new->ndpr_flags; 898 pr->ndpr_vltime = new->ndpr_vltime; 899 pr->ndpr_pltime = new->ndpr_pltime; 900 pr->ndpr_preferred = new->ndpr_preferred; 901 pr->ndpr_expire = new->ndpr_expire; 902 903 /* 904 * RFC 2462 5.5.3 (d) or (e) 905 * We got a prefix which we have seen in the past. 906 */ 907 if (!new->ndpr_raf_auto) 908 goto noautoconf1; 909 910 if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 911 ia6 = NULL; 912 else 913 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 914 915 if (ia6 == NULL) { 916 /* 917 * Special case: 918 * (1) We have seen the prefix advertised before, but 919 * we have never performed autoconfig for this prefix. 920 * This is because Autonomous bit was 0 previously, or 921 * autoconfig failed due to some other reasons. 922 * (2) We have seen the prefix advertised before and 923 * we have performed autoconfig in the past, but 924 * we seem to have no interface address right now. 925 * This is because the interface address have expired. 926 * 927 * This prefix is fresh, with respect to autoconfig 928 * process. 929 * 930 * Add an address based on RFC 2462 5.5.3 (d). 931 */ 932 ia6 = in6_ifadd(pr->ndpr_ifp, 933 &pr->ndpr_prefix.sin6_addr, &pr->ndpr_addr, 934 new->ndpr_plen); 935 if (!ia6) { 936 error = EADDRNOTAVAIL; 937 log(LOG_ERR, "prelist_update: failed to add a " 938 "new address\n"); 939 goto noautoconf1; 940 } 941 942 lt6 = &ia6->ia6_lifetime; 943 944 /* address lifetime <= prefix lifetime */ 945 lt6->ia6t_vltime = new->ndpr_vltime; 946 lt6->ia6t_pltime = new->ndpr_pltime; 947 in6_init_address_ltimes(new, lt6, 1); 948 } else { 949#define TWOHOUR (120*60) 950 /* 951 * We have seen the prefix before, and we have added 952 * interface address in the past. We still have 953 * the interface address assigned. 954 * 955 * update address lifetime based on RFC 2462 956 * 5.5.3 (e). 957 */ 958 int update = 0; 959 960 lt6 = &ia6->ia6_lifetime; 961 962#if 0 /* RFC 2462 5.5.3 (e) */ 963 lt6->ia6t_pltime = new->ndpr_pltime; 964 if (TWOHOUR < new->ndpr_vltime 965 || lt6pr->nd < new->ndpr_vltime) { 966 lt6->ia6t_vltime = new->ndpr_vltime; 967 update++; 968 } else if (auth 969 && lt6->ia6t_vltime <= TWOHOUR0 970 && new->ndpr_vltime <= lt6->ia6t_vltime) { 971 lt6->ia6t_vltime = new->ndpr_vltime; 972 update++; 973 } else { 974 lt6->ia6t_vltime = TWOHOUR; 975 update++; 976 } 977 978 /* 2 hour rule is not imposed for pref lifetime */ 979 new->ndpr_apltime = new->ndpr_pltime; 980 lt6->ia6t_pltime = new->ndpr_pltime; 981#else /* update from Jim Bound, (ipng 6712) */ 982 if (TWOHOUR < new->ndpr_vltime 983 || lt6->ia6t_vltime < new->ndpr_vltime) { 984 lt6->ia6t_vltime = new->ndpr_vltime; 985 update++; 986 } else if (auth) { 987 lt6->ia6t_vltime = new->ndpr_vltime; 988 update++; 989 } 990 991 /* jim bound rule is not imposed for pref lifetime */ 992 lt6->ia6t_pltime = new->ndpr_pltime; 993#endif 994 in6_init_address_ltimes(new, lt6, update); 995 } 996 997 noautoconf1: 998 999#if 0 1000 /* address lifetime expire processing, RFC 2462 5.5.4. */ 1001 if (pr->ndpr_preferred && pr->ndpr_preferred < time_second) { 1002 struct in6_ifaddr *ia6; 1003 1004 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 1005 if (ia6) 1006 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 1007 } 1008#endif 1009 1010 onlink = pr->ndpr_statef_onlink; /* Mobile IPv6 */ 1011 1012 if (dr && pfxrtr_lookup(pr, dr) == NULL) 1013 pfxrtr_add(pr, dr); 1014 1015 } else { 1016 int error_tmp; 1017 1018 if (new->ndpr_vltime == 0) goto end; 1019 1020 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 1021 1022 /* 1023 * RFC 2462 5.5.3 (d) 1024 * We got a fresh prefix. Perform some sanity checks 1025 * and add an interface address by appending interface ID 1026 * to the advertised prefix. 1027 */ 1028 if (!new->ndpr_raf_auto) 1029 goto noautoconf2; 1030 1031 ia6 = in6_ifadd(new->ndpr_ifp, &new->ndpr_prefix.sin6_addr, 1032 &new->ndpr_addr, new->ndpr_plen); 1033 if (!ia6) { 1034 error = EADDRNOTAVAIL; 1035 log(LOG_ERR, "prelist_update: " 1036 "failed to add a new address\n"); 1037 goto noautoconf2; 1038 } 1039 /* set onlink bit if an interface route is configured */ 1040 new->ndpr_statef_onlink = (ia6->ia_flags & IFA_ROUTE) ? 1 : 0; 1041 1042 lt6 = &ia6->ia6_lifetime; 1043 1044 /* address lifetime <= prefix lifetime */ 1045 lt6->ia6t_vltime = new->ndpr_vltime; 1046 lt6->ia6t_pltime = new->ndpr_pltime; 1047 in6_init_address_ltimes(new, lt6, 1); 1048 1049 noautoconf2: 1050 error_tmp = prelist_add(new, dr); 1051 error = error_tmp ? error_tmp : error; 1052 } 1053 1054 end: 1055 splx(s); 1056 return error; 1057} 1058 1059/* 1060 * A supplement function used in the on-link detection below; 1061 * detect if a given prefix has a (probably) reachable advertising router. 1062 * XXX: lengthy function name... 1063 */ 1064struct nd_pfxrouter * 1065find_pfxlist_reachable_router(pr) 1066 struct nd_prefix *pr; 1067{ 1068 struct nd_pfxrouter *pfxrtr; 1069 struct rtentry *rt; 1070 struct llinfo_nd6 *ln; 1071 1072 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1073 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1074 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1075 pfxrtr->router->ifp)) && 1076 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1077 ND6_IS_LLINFO_PROBREACH(ln)) 1078 break; /* found */ 1079 } 1080 1081 return(pfxrtr); 1082 1083} 1084 1085/* 1086 * Check if each prefix in the prefix list has at least one available router 1087 * that advertised the prefix (A router is "available" if its neighbor cache 1088 * entry has reachable or probably reachable). 1089 * If the check fails, the prefix may be off-link, because, for example, 1090 * we have moved from the network but the lifetime of the prefix has not 1091 * been expired yet. So we should not use the prefix if there is another 1092 * prefix that has an available router. 1093 * But if there is no prefix that has an available router, we still regards 1094 * all the prefixes as on-link. This is because we can't tell if all the 1095 * routers are simply dead or if we really moved from the network and there 1096 * is no router around us. 1097 */ 1098void 1099pfxlist_onlink_check() 1100{ 1101 struct nd_prefix *pr; 1102 1103 /* 1104 * Check if there is a prefix that has a reachable advertising 1105 * router. 1106 */ 1107 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1108 if (find_pfxlist_reachable_router(pr)) 1109 break; 1110 } 1111 1112 if (pr) { 1113 /* 1114 * There is at least one prefix that has a reachable router. 1115 * First, detach prefixes which has no reachable advertising 1116 * router and then attach other prefixes. 1117 * The order is important since an attached prefix and a 1118 * detached prefix may have a same interface route. 1119 */ 1120 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1121 if (find_pfxlist_reachable_router(pr) == NULL && 1122 pr->ndpr_statef_onlink) { 1123 pr->ndpr_statef_onlink = 0; 1124 nd6_detach_prefix(pr); 1125 } 1126 } 1127 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1128 if (find_pfxlist_reachable_router(pr) && 1129 pr->ndpr_statef_onlink == 0) 1130 nd6_attach_prefix(pr); 1131 } 1132 } 1133 else { 1134 /* there is no prefix that has a reachable router */ 1135 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) 1136 if (pr->ndpr_statef_onlink == 0) 1137 nd6_attach_prefix(pr); 1138 } 1139} 1140 1141static void 1142nd6_detach_prefix(pr) 1143 struct nd_prefix *pr; 1144{ 1145 struct in6_ifaddr *ia6; 1146 struct sockaddr_in6 sa6, mask6; 1147 1148 /* 1149 * Delete the interface route associated with the prefix. 1150 */ 1151 bzero(&sa6, sizeof(sa6)); 1152 sa6.sin6_family = AF_INET6; 1153 sa6.sin6_len = sizeof(sa6); 1154 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1155 sizeof(struct in6_addr)); 1156 bzero(&mask6, sizeof(mask6)); 1157 mask6.sin6_family = AF_INET6; 1158 mask6.sin6_len = sizeof(sa6); 1159 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1160 { 1161 int e; 1162 1163 e = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1164 (struct sockaddr *)&mask6, 0, NULL); 1165 if (e) { 1166 log(LOG_ERR, 1167 "nd6_detach_prefix: failed to delete route: " 1168 "%s/%d (errno = %d)\n", 1169 ip6_sprintf(&sa6.sin6_addr), 1170 pr->ndpr_plen, 1171 e); 1172 } 1173 } 1174 1175 /* 1176 * Mark the address derived from the prefix detached so that 1177 * it won't be used as a source address for a new connection. 1178 */ 1179 if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 1180 ia6 = NULL; 1181 else 1182 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 1183 if (ia6) 1184 ia6->ia6_flags |= IN6_IFF_DETACHED; 1185} 1186 1187static void 1188nd6_attach_prefix(pr) 1189 struct nd_prefix *pr; 1190{ 1191 struct ifaddr *ifa; 1192 struct in6_ifaddr *ia6; 1193 1194 /* 1195 * Add the interface route associated with the prefix(if necessary) 1196 * Should we consider if the L bit is set in pr->ndpr_flags? 1197 */ 1198 ifa = ifaof_ifpforaddr((struct sockaddr *)&pr->ndpr_prefix, 1199 pr->ndpr_ifp); 1200 if (ifa == NULL) { 1201 log(LOG_ERR, 1202 "nd6_attach_prefix: failed to find any ifaddr" 1203 " to add route for a prefix(%s/%d)\n", 1204 ip6_sprintf(&pr->ndpr_addr), pr->ndpr_plen); 1205 } 1206 else { 1207 int e; 1208 struct sockaddr_in6 mask6; 1209 1210 bzero(&mask6, sizeof(mask6)); 1211 mask6.sin6_family = AF_INET6; 1212 mask6.sin6_len = sizeof(mask6); 1213 mask6.sin6_addr = pr->ndpr_mask; 1214 e = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1215 ifa->ifa_addr, (struct sockaddr *)&mask6, 1216 ifa->ifa_flags, NULL); 1217 if (e == 0) 1218 pr->ndpr_statef_onlink = 1; 1219 else { 1220 log(LOG_ERR, 1221 "nd6_attach_prefix: failed to add route for" 1222 " a prefix(%s/%d), errno = %d\n", 1223 ip6_sprintf(&pr->ndpr_addr), pr->ndpr_plen, e); 1224 } 1225 } 1226 1227 /* 1228 * Now the address derived from the prefix can be used as a source 1229 * for a new connection, so clear the detached flag. 1230 */ 1231 if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 1232 ia6 = NULL; 1233 else 1234 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 1235 if (ia6) { 1236 ia6->ia6_flags &= ~IN6_IFF_DETACHED; 1237 if (pr->ndpr_statef_onlink) 1238 ia6->ia_flags |= IFA_ROUTE; 1239 } 1240} 1241 1242static struct in6_ifaddr * 1243in6_ifadd(ifp, in6, addr, prefixlen) 1244 struct ifnet *ifp; 1245 struct in6_addr *in6; 1246 struct in6_addr *addr; 1247 int prefixlen; /* prefix len of the new prefix in "in6" */ 1248{ 1249 struct ifaddr *ifa; 1250 struct in6_ifaddr *ia, *ib, *oia; 1251 int s, error; 1252 struct in6_addr mask; 1253 1254 in6_len2mask(&mask, prefixlen); 1255 1256 /* find link-local address (will be interface ID) */ 1257 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1258 if (ifa) 1259 ib = (struct in6_ifaddr *)ifa; 1260 else 1261 return NULL; 1262 1263#if 0 /* don't care link local addr state, and always do DAD */ 1264 /* if link-local address is not eligible, do not autoconfigure. */ 1265 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1266 printf("in6_ifadd: link-local address not ready\n"); 1267 return NULL; 1268 } 1269#endif 1270 1271 /* prefixlen + ifidlen must be equal to 128 */ 1272 if (prefixlen != in6_mask2len(&ib->ia_prefixmask.sin6_addr)) { 1273 log(LOG_ERR, "in6_ifadd: wrong prefixlen for %s" 1274 "(prefix=%d ifid=%d)\n", if_name(ifp), 1275 prefixlen, 1276 128 - in6_mask2len(&ib->ia_prefixmask.sin6_addr)); 1277 return NULL; 1278 } 1279 1280 /* make ifaddr */ 1281 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_DONTWAIT); 1282 if (ia == NULL) { 1283 printf("ENOBUFS in in6_ifadd %d\n", __LINE__); 1284 return NULL; 1285 } 1286 1287 bzero((caddr_t)ia, sizeof(*ia)); 1288 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1289 if (ifp->if_flags & IFF_POINTOPOINT) 1290 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 1291 else 1292 ia->ia_ifa.ifa_dstaddr = NULL; 1293 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1294 ia->ia_ifp = ifp; 1295 1296 /* link to in6_ifaddr */ 1297 if ((oia = in6_ifaddr) != NULL) { 1298 for( ; oia->ia_next; oia = oia->ia_next) 1299 continue; 1300 oia->ia_next = ia; 1301 } else { 1302 /* 1303 * This should be impossible, since we have at least one 1304 * link-local address (see the beginning of this function). 1305 * XXX: should we rather panic here? 1306 */ 1307 printf("in6_ifadd: in6_ifaddr is NULL (impossible!)\n"); 1308 in6_ifaddr = ia; 1309 } 1310 /* gain a refcnt for the link from in6_ifaddr */ 1311 ia->ia_ifa.ifa_refcnt++; 1312 1313 /* link to if_addrlist */ 1314 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 1315 /* gain another refcnt for the link from if_addrlist */ 1316 ia->ia_ifa.ifa_refcnt++; 1317 1318 /* new address */ 1319 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 1320 ia->ia_addr.sin6_family = AF_INET6; 1321 /* prefix */ 1322 bcopy(in6, &ia->ia_addr.sin6_addr, sizeof(ia->ia_addr.sin6_addr)); 1323 ia->ia_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1324 ia->ia_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1325 ia->ia_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1326 ia->ia_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1327 /* interface ID */ 1328 ia->ia_addr.sin6_addr.s6_addr32[0] 1329 |= (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); 1330 ia->ia_addr.sin6_addr.s6_addr32[1] 1331 |= (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); 1332 ia->ia_addr.sin6_addr.s6_addr32[2] 1333 |= (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); 1334 ia->ia_addr.sin6_addr.s6_addr32[3] 1335 |= (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); 1336 1337 /* new prefix */ 1338 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1339 ia->ia_prefixmask.sin6_family = AF_INET6; 1340 bcopy(&mask, &ia->ia_prefixmask.sin6_addr, 1341 sizeof(ia->ia_prefixmask.sin6_addr)); 1342 1343 /* same routine */ 1344 ia->ia_ifa.ifa_rtrequest = 1345 (ifp->if_type == IFT_PPP) ? nd6_p2p_rtrequest : nd6_rtrequest; 1346 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1347 ia->ia_ifa.ifa_metric = ifp->if_metric; 1348 1349 /* add interface route */ 1350 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP|RTF_CLONING))) { 1351 log(LOG_NOTICE, "in6_ifadd: failed to add an interface route " 1352 "for %s/%d on %s, errno = %d\n", 1353 ip6_sprintf(&ia->ia_addr.sin6_addr), prefixlen, 1354 if_name(ifp), error); 1355 } else 1356 ia->ia_flags |= IFA_ROUTE; 1357 1358 *addr = ia->ia_addr.sin6_addr; 1359 1360 if (ifp->if_flags & IFF_MULTICAST) { 1361 int error; /* not used */ 1362 struct in6_addr sol6; 1363 1364 /* join solicited node multicast address */ 1365 bzero(&sol6, sizeof(sol6)); 1366 sol6.s6_addr16[0] = htons(0xff02); 1367 sol6.s6_addr16[1] = htons(ifp->if_index); 1368 sol6.s6_addr32[1] = 0; 1369 sol6.s6_addr32[2] = htonl(1); 1370 sol6.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; 1371 sol6.s6_addr8[12] = 0xff; 1372 (void)in6_addmulti(&sol6, ifp, &error); 1373 } 1374 1375 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1376 1377 /* 1378 * To make the interface up. Only AF_INET6 in ia is used... 1379 */ 1380 s = splimp(); 1381 if (ifp->if_ioctl && (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) { 1382 splx(s); 1383 return NULL; 1384 } 1385 splx(s); 1386 1387 /* Perform DAD, if needed. */ 1388 nd6_dad_start((struct ifaddr *)ia, NULL); 1389 1390 return ia; 1391} 1392 1393int 1394in6_ifdel(ifp, in6) 1395 struct ifnet *ifp; 1396 struct in6_addr *in6; 1397{ 1398 struct in6_ifaddr *ia = (struct in6_ifaddr *)NULL; 1399 struct in6_ifaddr *oia = (struct in6_ifaddr *)NULL; 1400 1401 if (!ifp) 1402 return -1; 1403 1404 ia = in6ifa_ifpwithaddr(ifp, in6); 1405 if (!ia) 1406 return -1; 1407 1408 if (ifp->if_flags & IFF_MULTICAST) { 1409 /* 1410 * delete solicited multicast addr for deleting host id 1411 */ 1412 struct in6_multi *in6m; 1413 struct in6_addr llsol; 1414 bzero(&llsol, sizeof(struct in6_addr)); 1415 llsol.s6_addr16[0] = htons(0xff02); 1416 llsol.s6_addr16[1] = htons(ifp->if_index); 1417 llsol.s6_addr32[1] = 0; 1418 llsol.s6_addr32[2] = htonl(1); 1419 llsol.s6_addr32[3] = 1420 ia->ia_addr.sin6_addr.s6_addr32[3]; 1421 llsol.s6_addr8[12] = 0xff; 1422 1423 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1424 if (in6m) 1425 in6_delmulti(in6m); 1426 } 1427 1428 if (ia->ia_flags & IFA_ROUTE) { 1429 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 1430 ia->ia_flags &= ~IFA_ROUTE; 1431 } 1432 1433 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 1434 IFAFREE(&ia->ia_ifa); 1435 1436 /* lladdr is never deleted */ 1437 oia = ia; 1438 if (oia == (ia = in6_ifaddr)) 1439 in6_ifaddr = ia->ia_next; 1440 else { 1441 while (ia->ia_next && (ia->ia_next != oia)) 1442 ia = ia->ia_next; 1443 if (ia->ia_next) 1444 ia->ia_next = oia->ia_next; 1445 else 1446 return -1; 1447 } 1448 1449 IFAFREE((&oia->ia_ifa)); 1450/* xxx 1451 rtrequest(RTM_DELETE, 1452 (struct sockaddr *)&ia->ia_addr, 1453 (struct sockaddr *)0 1454 (struct sockaddr *)&ia->ia_prefixmask, 1455 RTF_UP|RTF_CLONING, 1456 (struct rtentry **)0); 1457*/ 1458 return 0; 1459} 1460 1461int 1462in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1463{ 1464 1465 /* check if preferred lifetime > valid lifetime */ 1466 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1467 log(LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1468 "(%d) is greater than valid lifetime(%d)\n", 1469 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime); 1470 return (EINVAL); 1471 } 1472 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1473 ndpr->ndpr_preferred = 0; 1474 else 1475 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1476 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1477 ndpr->ndpr_expire = 0; 1478 else 1479 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1480 1481 return 0; 1482} 1483 1484static void 1485in6_init_address_ltimes(struct nd_prefix *new, 1486 struct in6_addrlifetime *lt6, 1487 int update_vltime) 1488{ 1489 1490 /* Valid lifetime must not be updated unless explicitly specified. */ 1491 if (update_vltime) { 1492 /* init ia6t_expire */ 1493 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1494 lt6->ia6t_expire = 0; 1495 else { 1496 lt6->ia6t_expire = time_second; 1497 lt6->ia6t_expire += lt6->ia6t_vltime; 1498 } 1499 /* Ensure addr lifetime <= prefix lifetime. */ 1500 if (new->ndpr_expire && lt6->ia6t_expire && 1501 new->ndpr_expire < lt6->ia6t_expire) 1502 lt6->ia6t_expire = new->ndpr_expire; 1503 } 1504 1505 /* init ia6t_preferred */ 1506 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1507 lt6->ia6t_preferred = 0; 1508 else { 1509 lt6->ia6t_preferred = time_second; 1510 lt6->ia6t_preferred += lt6->ia6t_pltime; 1511 } 1512 /* Ensure addr lifetime <= prefix lifetime. */ 1513 if (new->ndpr_preferred && lt6->ia6t_preferred 1514 && new->ndpr_preferred < lt6->ia6t_preferred) 1515 lt6->ia6t_preferred = new->ndpr_preferred; 1516} 1517 1518/* 1519 * Delete all the routing table entries that use the specified gateway. 1520 * XXX: this function causes search through all entries of routing table, so 1521 * it shouldn't be called when acting as a router. 1522 */ 1523void 1524rt6_flush(gateway, ifp) 1525 struct in6_addr *gateway; 1526 struct ifnet *ifp; 1527{ 1528 struct radix_node_head *rnh = rt_tables[AF_INET6]; 1529 int s = splnet(); 1530 1531 /* We'll care only link-local addresses */ 1532 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 1533 splx(s); 1534 return; 1535 } 1536 /* XXX: hack for KAME's link-local address kludge */ 1537 gateway->s6_addr16[1] = htons(ifp->if_index); 1538 1539 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1540 splx(s); 1541} 1542 1543static int 1544rt6_deleteroute(rn, arg) 1545 struct radix_node *rn; 1546 void *arg; 1547{ 1548#define SIN6(s) ((struct sockaddr_in6 *)s) 1549 struct rtentry *rt = (struct rtentry *)rn; 1550 struct in6_addr *gate = (struct in6_addr *)arg; 1551 1552 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1553 return(0); 1554 1555 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1556 return(0); 1557 1558 /* 1559 * We delete only host route. This means, in particular, we don't 1560 * delete default route. 1561 */ 1562 if ((rt->rt_flags & RTF_HOST) == 0) 1563 return(0); 1564 1565 return(rtrequest(RTM_DELETE, rt_key(rt), 1566 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1567#undef SIN6 1568} 1569 1570int 1571nd6_setdefaultiface(ifindex) 1572 int ifindex; 1573{ 1574 int error = 0; 1575 1576 if (ifindex < 0 || if_index < ifindex) 1577 return(EINVAL); 1578 1579 if (nd6_defifindex != ifindex) { 1580 nd6_defifindex = ifindex; 1581 if (nd6_defifindex > 0) 1582 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1583 else 1584 nd6_defifp = NULL; 1585 1586 /* 1587 * If the Default Router List is empty, install a route 1588 * to the specified interface as default or remove the default 1589 * route when the default interface becomes canceled. 1590 * The check for the queue is actually redundant, but 1591 * we do this here to avoid re-install the default route 1592 * if the list is NOT empty. 1593 */ 1594 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1595 defrouter_select(); 1596 1597 /* 1598 * Our current implementation assumes one-to-one maping between 1599 * interfaces and links, so it would be natural to use the 1600 * default interface as the default link. 1601 */ 1602 scope6_setdefault(nd6_defifp); 1603 } 1604 1605 return(error); 1606} 1607