Annotation of sys/netinet6/nd6_rtr.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: nd6_rtr.c,v 1.43 2007/05/28 23:07:13 pyr Exp $ */
! 2: /* $KAME: nd6_rtr.c,v 1.97 2001/02/07 11:09:13 itojun 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 <sys/param.h>
! 34: #include <sys/systm.h>
! 35: #include <sys/malloc.h>
! 36: #include <sys/mbuf.h>
! 37: #include <sys/socket.h>
! 38: #include <sys/sockio.h>
! 39: #include <sys/time.h>
! 40: #include <sys/kernel.h>
! 41: #include <sys/errno.h>
! 42: #include <sys/ioctl.h>
! 43: #include <sys/syslog.h>
! 44: #include <sys/queue.h>
! 45: #include <dev/rndvar.h>
! 46:
! 47: #include <net/if.h>
! 48: #include <net/if_types.h>
! 49: #include <net/if_dl.h>
! 50: #include <net/route.h>
! 51: #include <net/radix.h>
! 52:
! 53: #include <netinet/in.h>
! 54: #include <netinet6/in6_var.h>
! 55: #include <netinet/ip6.h>
! 56: #include <netinet6/ip6_var.h>
! 57: #include <netinet6/nd6.h>
! 58: #include <netinet/icmp6.h>
! 59:
! 60: #define SDL(s) ((struct sockaddr_dl *)s)
! 61:
! 62: static int rtpref(struct nd_defrouter *);
! 63: static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
! 64: static struct in6_ifaddr *in6_ifadd(struct nd_prefix *);
! 65: static struct nd_pfxrouter *pfxrtr_lookup(struct nd_prefix *,
! 66: struct nd_defrouter *);
! 67: static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
! 68: static void pfxrtr_del(struct nd_pfxrouter *);
! 69: static struct nd_pfxrouter *find_pfxlist_reachable_router(struct nd_prefix *);
! 70: static void defrouter_delreq(struct nd_defrouter *);
! 71: static void nd6_rtmsg(int, struct rtentry *);
! 72:
! 73: static void in6_init_address_ltimes(struct nd_prefix *,
! 74: struct in6_addrlifetime *);
! 75:
! 76: static int rt6_deleteroute(struct radix_node *, void *);
! 77:
! 78: extern int nd6_recalc_reachtm_interval;
! 79:
! 80: static struct ifnet *nd6_defifp;
! 81: int nd6_defifindex;
! 82:
! 83: /*
! 84: * Receive Router Solicitation Message - just for routers.
! 85: * Router solicitation/advertisement is mostly managed by userland program
! 86: * (rtadvd) so here we have no function like nd6_ra_output().
! 87: *
! 88: * Based on RFC 2461
! 89: */
! 90: void
! 91: nd6_rs_input(m, off, icmp6len)
! 92: struct mbuf *m;
! 93: int off, icmp6len;
! 94: {
! 95: struct ifnet *ifp = m->m_pkthdr.rcvif;
! 96: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
! 97: struct nd_router_solicit *nd_rs;
! 98: struct in6_addr saddr6 = ip6->ip6_src;
! 99: #if 0
! 100: struct in6_addr daddr6 = ip6->ip6_dst;
! 101: #endif
! 102: char *lladdr = NULL;
! 103: int lladdrlen = 0;
! 104: #if 0
! 105: struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL;
! 106: struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL;
! 107: struct rtentry *rt = NULL;
! 108: int is_newentry;
! 109: #endif
! 110: union nd_opts ndopts;
! 111:
! 112: /* If I'm not a router, ignore it. */
! 113: if (ip6_accept_rtadv != 0 || !ip6_forwarding)
! 114: goto freeit;
! 115:
! 116: /* Sanity checks */
! 117: if (ip6->ip6_hlim != 255) {
! 118: nd6log((LOG_ERR,
! 119: "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
! 120: ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
! 121: ip6_sprintf(&ip6->ip6_dst), ifp->if_xname));
! 122: goto bad;
! 123: }
! 124:
! 125: /*
! 126: * Don't update the neighbor cache, if src = ::.
! 127: * This indicates that the src has no IP address assigned yet.
! 128: */
! 129: if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
! 130: goto freeit;
! 131:
! 132: IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
! 133: if (nd_rs == NULL) {
! 134: icmp6stat.icp6s_tooshort++;
! 135: return;
! 136: }
! 137:
! 138: icmp6len -= sizeof(*nd_rs);
! 139: nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
! 140: if (nd6_options(&ndopts) < 0) {
! 141: nd6log((LOG_INFO,
! 142: "nd6_rs_input: invalid ND option, ignored\n"));
! 143: /* nd6_options have incremented stats */
! 144: goto freeit;
! 145: }
! 146:
! 147: if (ndopts.nd_opts_src_lladdr) {
! 148: lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
! 149: lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
! 150: }
! 151:
! 152: if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
! 153: nd6log((LOG_INFO,
! 154: "nd6_rs_input: lladdrlen mismatch for %s "
! 155: "(if %d, RS packet %d)\n",
! 156: ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
! 157: goto bad;
! 158: }
! 159:
! 160: nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
! 161:
! 162: freeit:
! 163: m_freem(m);
! 164: return;
! 165:
! 166: bad:
! 167: icmp6stat.icp6s_badrs++;
! 168: m_freem(m);
! 169: }
! 170:
! 171: /*
! 172: * Receive Router Advertisement Message.
! 173: *
! 174: * Based on RFC 2461
! 175: * TODO: on-link bit on prefix information
! 176: * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
! 177: */
! 178: void
! 179: nd6_ra_input(m, off, icmp6len)
! 180: struct mbuf *m;
! 181: int off, icmp6len;
! 182: {
! 183: struct ifnet *ifp = m->m_pkthdr.rcvif;
! 184: struct nd_ifinfo *ndi = ND_IFINFO(ifp);
! 185: struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
! 186: struct nd_router_advert *nd_ra;
! 187: struct in6_addr saddr6 = ip6->ip6_src;
! 188: #if 0
! 189: struct in6_addr daddr6 = ip6->ip6_dst;
! 190: int flags; /* = nd_ra->nd_ra_flags_reserved; */
! 191: int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
! 192: int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
! 193: #endif
! 194: union nd_opts ndopts;
! 195: struct nd_defrouter *dr;
! 196:
! 197: /*
! 198: * We only accept RAs only when
! 199: * the system-wide variable allows the acceptance, and
! 200: * per-interface variable allows RAs on the receiving interface.
! 201: */
! 202: if (ip6_accept_rtadv == 0)
! 203: goto freeit;
! 204: if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
! 205: goto freeit;
! 206:
! 207: if (ip6->ip6_hlim != 255) {
! 208: nd6log((LOG_ERR,
! 209: "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
! 210: ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
! 211: ip6_sprintf(&ip6->ip6_dst), ifp->if_xname));
! 212: goto bad;
! 213: }
! 214:
! 215: if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
! 216: nd6log((LOG_ERR,
! 217: "nd6_ra_input: src %s is not link-local\n",
! 218: ip6_sprintf(&saddr6)));
! 219: goto bad;
! 220: }
! 221:
! 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:
! 228: icmp6len -= sizeof(*nd_ra);
! 229: nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
! 230: if (nd6_options(&ndopts) < 0) {
! 231: nd6log((LOG_INFO,
! 232: "nd6_ra_input: invalid ND option, ignored\n"));
! 233: /* nd6_options have incremented stats */
! 234: goto freeit;
! 235: }
! 236:
! 237: {
! 238: struct nd_defrouter dr0;
! 239: u_int32_t advreachable = nd_ra->nd_ra_reachable;
! 240:
! 241: Bzero(&dr0, sizeof(dr0));
! 242: dr0.rtaddr = saddr6;
! 243: dr0.flags = nd_ra->nd_ra_flags_reserved;
! 244: dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
! 245: dr0.expire = time_second + dr0.rtlifetime;
! 246: dr0.ifp = ifp;
! 247: /* unspecified or not? (RFC 2461 6.3.4) */
! 248: if (advreachable) {
! 249: NTOHL(advreachable);
! 250: if (advreachable <= MAX_REACHABLE_TIME &&
! 251: ndi->basereachable != advreachable) {
! 252: ndi->basereachable = advreachable;
! 253: ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
! 254: ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
! 255: }
! 256: }
! 257: if (nd_ra->nd_ra_retransmit)
! 258: ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
! 259: if (nd_ra->nd_ra_curhoplimit)
! 260: ndi->chlim = nd_ra->nd_ra_curhoplimit;
! 261: dr = defrtrlist_update(&dr0);
! 262: }
! 263:
! 264: /*
! 265: * prefix
! 266: */
! 267: if (ndopts.nd_opts_pi) {
! 268: struct nd_opt_hdr *pt;
! 269: struct nd_opt_prefix_info *pi = NULL;
! 270: struct nd_prefix pr;
! 271:
! 272: for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
! 273: pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
! 274: pt = (struct nd_opt_hdr *)((caddr_t)pt +
! 275: (pt->nd_opt_len << 3))) {
! 276: if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
! 277: continue;
! 278: pi = (struct nd_opt_prefix_info *)pt;
! 279:
! 280: if (pi->nd_opt_pi_len != 4) {
! 281: nd6log((LOG_INFO,
! 282: "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: nd6log((LOG_INFO,
! 290: "nd6_ra_input: invalid prefix "
! 291: "len %d for prefix information option, "
! 292: "ignored\n", pi->nd_opt_pi_prefix_len));
! 293: continue;
! 294: }
! 295:
! 296: if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
! 297: || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
! 298: nd6log((LOG_INFO,
! 299: "nd6_ra_input: invalid prefix "
! 300: "%s, ignored\n",
! 301: ip6_sprintf(&pi->nd_opt_pi_prefix)));
! 302: continue;
! 303: }
! 304:
! 305: /* aggregatable unicast address, rfc2374 */
! 306: if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20
! 307: && pi->nd_opt_pi_prefix_len != 64) {
! 308: nd6log((LOG_INFO,
! 309: "nd6_ra_input: invalid prefixlen "
! 310: "%d for rfc2374 prefix %s, ignored\n",
! 311: pi->nd_opt_pi_prefix_len,
! 312: ip6_sprintf(&pi->nd_opt_pi_prefix)));
! 313: continue;
! 314: }
! 315:
! 316: bzero(&pr, sizeof(pr));
! 317: pr.ndpr_prefix.sin6_family = AF_INET6;
! 318: pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
! 319: pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
! 320: pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
! 321:
! 322: pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
! 323: ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
! 324: pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
! 325: ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
! 326: pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
! 327: pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
! 328: pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
! 329: pr.ndpr_lastupdate = time_second;
! 330:
! 331: if (in6_init_prefix_ltimes(&pr))
! 332: continue; /* prefix lifetime init failed */
! 333:
! 334: (void)prelist_update(&pr, dr, m);
! 335: }
! 336: }
! 337:
! 338: /*
! 339: * MTU
! 340: */
! 341: if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
! 342: u_long mtu;
! 343: u_long maxmtu;
! 344:
! 345: mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
! 346:
! 347: /* lower bound */
! 348: if (mtu < IPV6_MMTU) {
! 349: nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
! 350: "mtu=%lu sent from %s, ignoring\n",
! 351: mtu, ip6_sprintf(&ip6->ip6_src)));
! 352: goto skip;
! 353: }
! 354:
! 355: /* upper bound */
! 356: maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
! 357: ? ndi->maxmtu : ifp->if_mtu;
! 358: if (mtu <= maxmtu) {
! 359: int change = (ndi->linkmtu != mtu);
! 360:
! 361: ndi->linkmtu = mtu;
! 362: if (change) /* in6_maxmtu may change */
! 363: in6_setmaxmtu();
! 364: } else {
! 365: nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
! 366: "mtu=%lu sent from %s; "
! 367: "exceeds maxmtu %lu, ignoring\n",
! 368: mtu, ip6_sprintf(&ip6->ip6_src), maxmtu));
! 369: }
! 370: }
! 371:
! 372: skip:
! 373:
! 374: /*
! 375: * Source link layer address
! 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: nd6log((LOG_INFO,
! 388: "nd6_ra_input: lladdrlen mismatch for %s "
! 389: "(if %d, RA packet %d)\n", ip6_sprintf(&saddr6),
! 390: ifp->if_addrlen, lladdrlen - 2));
! 391: goto bad;
! 392: }
! 393:
! 394: nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
! 395:
! 396: /*
! 397: * Installing a link-layer address might change the state of the
! 398: * router's neighbor cache, which might also affect our on-link
! 399: * detection of adveritsed prefixes.
! 400: */
! 401: pfxlist_onlink_check();
! 402: }
! 403:
! 404: freeit:
! 405: m_freem(m);
! 406: return;
! 407:
! 408: bad:
! 409: icmp6stat.icp6s_badra++;
! 410: m_freem(m);
! 411: }
! 412:
! 413: /*
! 414: * default router list processing sub routines
! 415: */
! 416:
! 417: /* tell the change to user processes watching the routing socket. */
! 418: static void
! 419: nd6_rtmsg(cmd, rt)
! 420: int cmd;
! 421: struct rtentry *rt;
! 422: {
! 423: struct rt_addrinfo info;
! 424:
! 425: bzero((caddr_t)&info, sizeof(info));
! 426: info.rti_info[RTAX_DST] = rt_key(rt);
! 427: info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
! 428: info.rti_info[RTAX_NETMASK] = rt_mask(rt);
! 429: if (rt->rt_ifp) {
! 430: info.rti_info[RTAX_IFP] =
! 431: TAILQ_FIRST(&rt->rt_ifp->if_addrlist)->ifa_addr;
! 432: info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
! 433: }
! 434:
! 435: rt_missmsg(cmd, &info, rt->rt_flags, rt->rt_ifp, 0, 0);
! 436: }
! 437:
! 438: void
! 439: defrouter_addreq(new)
! 440: struct nd_defrouter *new;
! 441: {
! 442: struct sockaddr_in6 def, mask, gate;
! 443: struct rtentry *newrt = NULL;
! 444: int s;
! 445: int error;
! 446:
! 447: Bzero(&def, sizeof(def));
! 448: Bzero(&mask, sizeof(mask));
! 449: Bzero(&gate, sizeof(gate)); /* for safety */
! 450:
! 451: def.sin6_len = mask.sin6_len = gate.sin6_len =
! 452: sizeof(struct sockaddr_in6);
! 453: def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
! 454: gate.sin6_addr = new->rtaddr;
! 455: gate.sin6_scope_id = 0; /* XXX */
! 456:
! 457: s = splsoftnet();
! 458: error = rtrequest(RTM_ADD, (struct sockaddr *)&def,
! 459: (struct sockaddr *)&gate, (struct sockaddr *)&mask,
! 460: RTF_GATEWAY, &newrt, 0);
! 461: if (newrt) {
! 462: nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
! 463: newrt->rt_refcnt--;
! 464: }
! 465: if (error == 0)
! 466: new->installed = 1;
! 467: splx(s);
! 468: return;
! 469: }
! 470:
! 471: struct nd_defrouter *
! 472: defrouter_lookup(addr, ifp)
! 473: struct in6_addr *addr;
! 474: struct ifnet *ifp;
! 475: {
! 476: struct nd_defrouter *dr;
! 477:
! 478: for (dr = TAILQ_FIRST(&nd_defrouter); dr;
! 479: dr = TAILQ_NEXT(dr, dr_entry)) {
! 480: if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) {
! 481: return (dr);
! 482: }
! 483: }
! 484:
! 485: return (NULL); /* search failed */
! 486: }
! 487:
! 488: void
! 489: defrtrlist_del(dr)
! 490: struct nd_defrouter *dr;
! 491: {
! 492: struct nd_defrouter *deldr = NULL;
! 493: struct nd_prefix *pr;
! 494:
! 495: /*
! 496: * Flush all the routing table entries that use the router
! 497: * as a next hop.
! 498: */
! 499: if (!ip6_forwarding && ip6_accept_rtadv) /* XXX: better condition? */
! 500: rt6_flush(&dr->rtaddr, dr->ifp);
! 501:
! 502: if (dr->installed) {
! 503: deldr = dr;
! 504: defrouter_delreq(dr);
! 505: }
! 506: TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
! 507:
! 508: /*
! 509: * Also delete all the pointers to the router in each prefix lists.
! 510: */
! 511: LIST_FOREACH(pr, &nd_prefix, ndpr_entry) {
! 512: struct nd_pfxrouter *pfxrtr;
! 513: if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
! 514: pfxrtr_del(pfxrtr);
! 515: }
! 516: pfxlist_onlink_check();
! 517:
! 518: /*
! 519: * If the router is the primary one, choose a new one.
! 520: * Note that defrouter_select() will remove the current gateway
! 521: * from the routing table.
! 522: */
! 523: if (deldr)
! 524: defrouter_select();
! 525:
! 526: free(dr, M_IP6NDP);
! 527: }
! 528:
! 529: /*
! 530: * Remove the default route for a given router.
! 531: * This is just a subroutine function for defrouter_select(), and should
! 532: * not be called from anywhere else.
! 533: */
! 534: static void
! 535: defrouter_delreq(dr)
! 536: struct nd_defrouter *dr;
! 537: {
! 538: struct sockaddr_in6 def, mask, gw;
! 539: struct rtentry *oldrt = NULL;
! 540:
! 541: #ifdef DIAGNOSTIC
! 542: if (!dr)
! 543: panic("dr == NULL in defrouter_delreq");
! 544: #endif
! 545:
! 546: Bzero(&def, sizeof(def));
! 547: Bzero(&mask, sizeof(mask));
! 548: Bzero(&gw, sizeof(gw)); /* for safety */
! 549:
! 550: def.sin6_len = mask.sin6_len = gw.sin6_len =
! 551: sizeof(struct sockaddr_in6);
! 552: def.sin6_family = mask.sin6_family = gw.sin6_family = AF_INET6;
! 553: gw.sin6_addr = dr->rtaddr;
! 554: gw.sin6_scope_id = 0; /* XXX */
! 555:
! 556: rtrequest(RTM_DELETE, (struct sockaddr *)&def,
! 557: (struct sockaddr *)&gw,
! 558: (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, 0);
! 559: if (oldrt) {
! 560: nd6_rtmsg(RTM_DELETE, oldrt);
! 561: if (oldrt->rt_refcnt <= 0) {
! 562: /*
! 563: * XXX: borrowed from the RTM_DELETE case of
! 564: * rtrequest().
! 565: */
! 566: oldrt->rt_refcnt++;
! 567: rtfree(oldrt);
! 568: }
! 569: }
! 570:
! 571: dr->installed = 0;
! 572: }
! 573:
! 574: /*
! 575: * remove all default routes from default router list
! 576: */
! 577: void
! 578: defrouter_reset()
! 579: {
! 580: struct nd_defrouter *dr;
! 581:
! 582: for (dr = TAILQ_FIRST(&nd_defrouter); dr;
! 583: dr = TAILQ_NEXT(dr, dr_entry))
! 584: defrouter_delreq(dr);
! 585:
! 586: /*
! 587: * XXX should we also nuke any default routers in the kernel, by
! 588: * going through them by rtalloc1()?
! 589: */
! 590: }
! 591:
! 592: /*
! 593: * Default Router Selection according to Section 6.3.6 of RFC 2461 and
! 594: * draft-ietf-ipngwg-router-selection:
! 595: * 1) Routers that are reachable or probably reachable should be preferred.
! 596: * If we have more than one (probably) reachable router, prefer ones
! 597: * with the highest router preference.
! 598: * 2) When no routers on the list are known to be reachable or
! 599: * probably reachable, routers SHOULD be selected in a round-robin
! 600: * fashion, regardless of router preference values.
! 601: * 3) If the Default Router List is empty, assume that all
! 602: * destinations are on-link.
! 603: *
! 604: * We assume nd_defrouter is sorted by router preference value.
! 605: * Since the code below covers both with and without router preference cases,
! 606: * we do not need to classify the cases by ifdef.
! 607: *
! 608: * At this moment, we do not try to install more than one default router,
! 609: * even when the multipath routing is available, because we're not sure about
! 610: * the benefits for stub hosts comparing to the risk of making the code
! 611: * complicated and the possibility of introducing bugs.
! 612: */
! 613: void
! 614: defrouter_select()
! 615: {
! 616: int s = splsoftnet();
! 617: struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
! 618: struct rtentry *rt = NULL;
! 619: struct llinfo_nd6 *ln = NULL;
! 620:
! 621: /*
! 622: * This function should be called only when acting as an autoconfigured
! 623: * host. Although the remaining part of this function is not effective
! 624: * if the node is not an autoconfigured host, we explicitly exclude
! 625: * such cases here for safety.
! 626: */
! 627: if (ip6_forwarding || !ip6_accept_rtadv) {
! 628: nd6log((LOG_WARNING,
! 629: "defrouter_select: called unexpectedly (forwarding=%d, "
! 630: "accept_rtadv=%d)\n", ip6_forwarding, ip6_accept_rtadv));
! 631: splx(s);
! 632: return;
! 633: }
! 634:
! 635: /*
! 636: * Let's handle easy case (3) first:
! 637: * If default router list is empty, there's nothing to be done.
! 638: */
! 639: if (!TAILQ_FIRST(&nd_defrouter)) {
! 640: splx(s);
! 641: return;
! 642: }
! 643:
! 644: /*
! 645: * Search for a (probably) reachable router from the list.
! 646: * We just pick up the first reachable one (if any), assuming that
! 647: * the ordering rule of the list described in defrtrlist_update().
! 648: */
! 649: for (dr = TAILQ_FIRST(&nd_defrouter); dr;
! 650: dr = TAILQ_NEXT(dr, dr_entry)) {
! 651: if (!selected_dr &&
! 652: (rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
! 653: (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
! 654: ND6_IS_LLINFO_PROBREACH(ln)) {
! 655: selected_dr = dr;
! 656: }
! 657:
! 658: if (dr->installed && !installed_dr)
! 659: installed_dr = dr;
! 660: else if (dr->installed && installed_dr) {
! 661: /* this should not happen. warn for diagnosis. */
! 662: log(LOG_ERR, "defrouter_select: more than one router"
! 663: " is installed\n");
! 664: }
! 665: }
! 666: /*
! 667: * If none of the default routers was found to be reachable,
! 668: * round-robin the list regardless of preference.
! 669: * Otherwise, if we have an installed router, check if the selected
! 670: * (reachable) router should really be preferred to the installed one.
! 671: * We only prefer the new router when the old one is not reachable
! 672: * or when the new one has a really higher preference value.
! 673: */
! 674: if (!selected_dr) {
! 675: if (!installed_dr || !TAILQ_NEXT(installed_dr, dr_entry))
! 676: selected_dr = TAILQ_FIRST(&nd_defrouter);
! 677: else
! 678: selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
! 679: } else if (installed_dr &&
! 680: (rt = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
! 681: (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
! 682: ND6_IS_LLINFO_PROBREACH(ln) &&
! 683: rtpref(selected_dr) <= rtpref(installed_dr)) {
! 684: selected_dr = installed_dr;
! 685: }
! 686:
! 687: /*
! 688: * If the selected router is different than the installed one,
! 689: * remove the installed router and install the selected one.
! 690: * Note that the selected router is never NULL here.
! 691: */
! 692: if (installed_dr != selected_dr) {
! 693: if (installed_dr)
! 694: defrouter_delreq(installed_dr);
! 695: defrouter_addreq(selected_dr);
! 696: }
! 697:
! 698: splx(s);
! 699: return;
! 700: }
! 701:
! 702: /*
! 703: * for default router selection
! 704: * regards router-preference field as a 2-bit signed integer
! 705: */
! 706: static int
! 707: rtpref(struct nd_defrouter *dr)
! 708: {
! 709: #ifdef RTPREF
! 710: switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
! 711: case ND_RA_FLAG_RTPREF_HIGH:
! 712: return RTPREF_HIGH;
! 713: case ND_RA_FLAG_RTPREF_MEDIUM:
! 714: case ND_RA_FLAG_RTPREF_RSV:
! 715: return RTPREF_MEDIUM;
! 716: case ND_RA_FLAG_RTPREF_LOW:
! 717: return RTPREF_LOW;
! 718: default:
! 719: /*
! 720: * This case should never happen. If it did, it would mean a
! 721: * serious bug of kernel internal. We thus always bark here.
! 722: * Or, can we even panic?
! 723: */
! 724: log(LOG_ERR, "rtpref: impossible RA flag %x", dr->flags);
! 725: return RTPREF_INVALID;
! 726: }
! 727: /* NOTREACHED */
! 728: #else
! 729: return 0;
! 730: #endif
! 731: }
! 732:
! 733: static struct nd_defrouter *
! 734: defrtrlist_update(new)
! 735: struct nd_defrouter *new;
! 736: {
! 737: struct nd_defrouter *dr, *n;
! 738: int s = splsoftnet();
! 739:
! 740: if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
! 741: /* entry exists */
! 742: if (new->rtlifetime == 0) {
! 743: defrtrlist_del(dr);
! 744: dr = NULL;
! 745: } else {
! 746: int oldpref = rtpref(dr);
! 747:
! 748: /* override */
! 749: dr->flags = new->flags; /* xxx flag check */
! 750: dr->rtlifetime = new->rtlifetime;
! 751: dr->expire = new->expire;
! 752:
! 753: /*
! 754: * If the preference does not change, there's no need
! 755: * to sort the entries.
! 756: */
! 757: if (rtpref(new) == oldpref) {
! 758: splx(s);
! 759: return (dr);
! 760: }
! 761:
! 762: /*
! 763: * preferred router may be changed, so relocate
! 764: * this router.
! 765: * XXX: calling TAILQ_REMOVE directly is a bad manner.
! 766: * However, since defrtrlist_del() has many side
! 767: * effects, we intentionally do so here.
! 768: * defrouter_select() below will handle routing
! 769: * changes later.
! 770: */
! 771: TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
! 772: n = dr;
! 773: goto insert;
! 774: }
! 775: splx(s);
! 776: return (dr);
! 777: }
! 778:
! 779: /* entry does not exist */
! 780: if (new->rtlifetime == 0) {
! 781: splx(s);
! 782: return (NULL);
! 783: }
! 784:
! 785: n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
! 786: if (n == NULL) {
! 787: splx(s);
! 788: return (NULL);
! 789: }
! 790: bzero(n, sizeof(*n));
! 791: *n = *new;
! 792:
! 793: insert:
! 794: /*
! 795: * Insert the new router in the Default Router List;
! 796: * The Default Router List should be in the descending order
! 797: * of router-preference. Routers with the same preference are
! 798: * sorted in the arriving time order.
! 799: */
! 800:
! 801: /* insert at the end of the group */
! 802: for (dr = TAILQ_FIRST(&nd_defrouter); dr;
! 803: dr = TAILQ_NEXT(dr, dr_entry)) {
! 804: if (rtpref(n) > rtpref(dr))
! 805: break;
! 806: }
! 807: if (dr)
! 808: TAILQ_INSERT_BEFORE(dr, n, dr_entry);
! 809: else
! 810: TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
! 811:
! 812: defrouter_select();
! 813:
! 814: splx(s);
! 815:
! 816: return (n);
! 817: }
! 818:
! 819: static struct nd_pfxrouter *
! 820: pfxrtr_lookup(pr, dr)
! 821: struct nd_prefix *pr;
! 822: struct nd_defrouter *dr;
! 823: {
! 824: struct nd_pfxrouter *search;
! 825:
! 826: LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) {
! 827: if (search->router == dr)
! 828: break;
! 829: }
! 830:
! 831: return (search);
! 832: }
! 833:
! 834: static void
! 835: pfxrtr_add(pr, dr)
! 836: struct nd_prefix *pr;
! 837: struct nd_defrouter *dr;
! 838: {
! 839: struct nd_pfxrouter *new;
! 840:
! 841: new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
! 842: if (new == NULL)
! 843: return;
! 844: bzero(new, sizeof(*new));
! 845: new->router = dr;
! 846:
! 847: LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
! 848:
! 849: pfxlist_onlink_check();
! 850: }
! 851:
! 852: static void
! 853: pfxrtr_del(pfr)
! 854: struct nd_pfxrouter *pfr;
! 855: {
! 856: LIST_REMOVE(pfr, pfr_entry);
! 857: free(pfr, M_IP6NDP);
! 858: }
! 859:
! 860: struct nd_prefix *
! 861: nd6_prefix_lookup(pr)
! 862: struct nd_prefix *pr;
! 863: {
! 864: struct nd_prefix *search;
! 865:
! 866: LIST_FOREACH(search, &nd_prefix, ndpr_entry) {
! 867: if (pr->ndpr_ifp == search->ndpr_ifp &&
! 868: pr->ndpr_plen == search->ndpr_plen &&
! 869: in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
! 870: &search->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
! 871: break;
! 872: }
! 873: }
! 874:
! 875: return (search);
! 876: }
! 877:
! 878: int
! 879: nd6_prelist_add(pr, dr, newp)
! 880: struct nd_prefix *pr, **newp;
! 881: struct nd_defrouter *dr;
! 882: {
! 883: struct nd_prefix *new = NULL;
! 884: int i, s;
! 885:
! 886: new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
! 887: if (new == NULL)
! 888: return ENOMEM;
! 889: bzero(new, sizeof(*new));
! 890: *new = *pr;
! 891: if (newp != NULL)
! 892: *newp = new;
! 893:
! 894: /* initialization */
! 895: LIST_INIT(&new->ndpr_advrtrs);
! 896: in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
! 897: /* make prefix in the canonical form */
! 898: for (i = 0; i < 4; i++)
! 899: new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
! 900: new->ndpr_mask.s6_addr32[i];
! 901:
! 902: s = splsoftnet();
! 903: /* link ndpr_entry to nd_prefix list */
! 904: LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
! 905: splx(s);
! 906:
! 907: /* ND_OPT_PI_FLAG_ONLINK processing */
! 908: if (new->ndpr_raf_onlink) {
! 909: int e;
! 910:
! 911: if ((e = nd6_prefix_onlink(new)) != 0) {
! 912: nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
! 913: "the prefix %s/%d on-link on %s (errno=%d)\n",
! 914: ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
! 915: pr->ndpr_plen, pr->ndpr_ifp->if_xname, e));
! 916: /* proceed anyway. XXX: is it correct? */
! 917: }
! 918: }
! 919:
! 920: if (dr)
! 921: pfxrtr_add(new, dr);
! 922:
! 923: return 0;
! 924: }
! 925:
! 926: void
! 927: prelist_remove(pr)
! 928: struct nd_prefix *pr;
! 929: {
! 930: struct nd_pfxrouter *pfr, *next;
! 931: int e, s;
! 932:
! 933: /* make sure to invalidate the prefix until it is really freed. */
! 934: pr->ndpr_vltime = 0;
! 935: pr->ndpr_pltime = 0;
! 936: #if 0
! 937: /*
! 938: * Though these flags are now meaningless, we'd rather keep the value
! 939: * not to confuse users when executing "ndp -p".
! 940: */
! 941: pr->ndpr_raf_onlink = 0;
! 942: pr->ndpr_raf_auto = 0;
! 943: #endif
! 944: if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
! 945: (e = nd6_prefix_offlink(pr)) != 0) {
! 946: nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
! 947: "on %s, errno=%d\n",
! 948: ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
! 949: pr->ndpr_plen, pr->ndpr_ifp->if_xname, e));
! 950: /* what should we do? */
! 951: }
! 952:
! 953: if (pr->ndpr_refcnt > 0)
! 954: return; /* notice here? */
! 955:
! 956: s = splsoftnet();
! 957:
! 958: /* unlink ndpr_entry from nd_prefix list */
! 959: LIST_REMOVE(pr, ndpr_entry);
! 960:
! 961: /* free list of routers that adversed the prefix */
! 962: for (pfr = LIST_FIRST(&pr->ndpr_advrtrs); pfr != NULL; pfr = next) {
! 963: next = LIST_NEXT(pfr, pfr_entry);
! 964:
! 965: free(pfr, M_IP6NDP);
! 966: }
! 967: splx(s);
! 968:
! 969: free(pr, M_IP6NDP);
! 970:
! 971: pfxlist_onlink_check();
! 972: }
! 973:
! 974: int
! 975: prelist_update(new, dr, m)
! 976: struct nd_prefix *new;
! 977: struct nd_defrouter *dr; /* may be NULL */
! 978: struct mbuf *m;
! 979: {
! 980: struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
! 981: struct ifaddr *ifa;
! 982: struct ifnet *ifp = new->ndpr_ifp;
! 983: struct nd_prefix *pr;
! 984: int s = splsoftnet();
! 985: int error = 0;
! 986: int newprefix = 0;
! 987: int auth;
! 988: struct in6_addrlifetime lt6_tmp;
! 989:
! 990: auth = 0;
! 991: if (m) {
! 992: /*
! 993: * Authenticity for NA consists authentication for
! 994: * both IP header and IP datagrams, doesn't it ?
! 995: */
! 996: auth = ((m->m_flags & M_AUTH_AH) && (m->m_flags & M_AUTH));
! 997: }
! 998:
! 999: if ((pr = nd6_prefix_lookup(new)) != NULL) {
! 1000: /*
! 1001: * nd6_prefix_lookup() ensures that pr and new have the same
! 1002: * prefix on a same interface.
! 1003: */
! 1004:
! 1005: /*
! 1006: * Update prefix information. Note that the on-link (L) bit
! 1007: * and the autonomous (A) bit should NOT be changed from 1
! 1008: * to 0.
! 1009: */
! 1010: if (new->ndpr_raf_onlink == 1)
! 1011: pr->ndpr_raf_onlink = 1;
! 1012: if (new->ndpr_raf_auto == 1)
! 1013: pr->ndpr_raf_auto = 1;
! 1014: if (new->ndpr_raf_onlink) {
! 1015: pr->ndpr_vltime = new->ndpr_vltime;
! 1016: pr->ndpr_pltime = new->ndpr_pltime;
! 1017: pr->ndpr_preferred = new->ndpr_preferred;
! 1018: pr->ndpr_expire = new->ndpr_expire;
! 1019: pr->ndpr_lastupdate = new->ndpr_lastupdate;
! 1020: }
! 1021:
! 1022: if (new->ndpr_raf_onlink &&
! 1023: (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
! 1024: int e;
! 1025:
! 1026: if ((e = nd6_prefix_onlink(pr)) != 0) {
! 1027: nd6log((LOG_ERR,
! 1028: "prelist_update: failed to make "
! 1029: "the prefix %s/%d on-link on %s "
! 1030: "(errno=%d)\n",
! 1031: ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
! 1032: pr->ndpr_plen, pr->ndpr_ifp->if_xname, e));
! 1033: /* proceed anyway. XXX: is it correct? */
! 1034: }
! 1035: }
! 1036:
! 1037: if (dr && pfxrtr_lookup(pr, dr) == NULL)
! 1038: pfxrtr_add(pr, dr);
! 1039: } else {
! 1040: struct nd_prefix *newpr = NULL;
! 1041:
! 1042: newprefix = 1;
! 1043:
! 1044: if (new->ndpr_vltime == 0)
! 1045: goto end;
! 1046: if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
! 1047: goto end;
! 1048:
! 1049: error = nd6_prelist_add(new, dr, &newpr);
! 1050: if (error != 0 || newpr == NULL) {
! 1051: nd6log((LOG_NOTICE, "prelist_update: "
! 1052: "nd6_prelist_add failed for %s/%d on %s "
! 1053: "errno=%d, returnpr=%p\n",
! 1054: ip6_sprintf(&new->ndpr_prefix.sin6_addr),
! 1055: new->ndpr_plen, new->ndpr_ifp->if_xname,
! 1056: error, newpr));
! 1057: goto end; /* we should just give up in this case. */
! 1058: }
! 1059:
! 1060: /*
! 1061: * XXX: from the ND point of view, we can ignore a prefix
! 1062: * with the on-link bit being zero. However, we need a
! 1063: * prefix structure for references from autoconfigured
! 1064: * addresses. Thus, we explicitly make sure that the prefix
! 1065: * itself expires now.
! 1066: */
! 1067: if (newpr->ndpr_raf_onlink == 0) {
! 1068: newpr->ndpr_vltime = 0;
! 1069: newpr->ndpr_pltime = 0;
! 1070: in6_init_prefix_ltimes(newpr);
! 1071: }
! 1072:
! 1073: pr = newpr;
! 1074: }
! 1075:
! 1076: /*
! 1077: * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
! 1078: * Note that pr must be non NULL at this point.
! 1079: */
! 1080:
! 1081: /* 5.5.3 (a). Ignore the prefix without the A bit set. */
! 1082: if (!new->ndpr_raf_auto)
! 1083: goto end;
! 1084:
! 1085: /*
! 1086: * 5.5.3 (b). the link-local prefix should have been ignored in
! 1087: * nd6_ra_input.
! 1088: */
! 1089:
! 1090: /*
! 1091: * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
! 1092: * This should have been done in nd6_ra_input.
! 1093: */
! 1094:
! 1095: /*
! 1096: * 5.5.3 (d). If the prefix advertised does not match the prefix of an
! 1097: * address already in the list, and the Valid Lifetime is not 0,
! 1098: * form an address. Note that even a manually configured address
! 1099: * should reject autoconfiguration of a new address.
! 1100: */
! 1101: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
! 1102: struct in6_ifaddr *ifa6;
! 1103: int ifa_plen;
! 1104: u_int32_t storedlifetime;
! 1105:
! 1106: if (ifa->ifa_addr->sa_family != AF_INET6)
! 1107: continue;
! 1108:
! 1109: ifa6 = (struct in6_ifaddr *)ifa;
! 1110:
! 1111: /*
! 1112: * Spec is not clear here, but I believe we should concentrate
! 1113: * on unicast (i.e. not anycast) addresses.
! 1114: * XXX: other ia6_flags? detached or duplicated?
! 1115: */
! 1116: if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
! 1117: continue;
! 1118:
! 1119: ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
! 1120: if (ifa_plen != new->ndpr_plen ||
! 1121: !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
! 1122: &new->ndpr_prefix.sin6_addr, ifa_plen))
! 1123: continue;
! 1124:
! 1125: if (ia6_match == NULL) /* remember the first one */
! 1126: ia6_match = ifa6;
! 1127:
! 1128: if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
! 1129: continue;
! 1130:
! 1131: /*
! 1132: * An already autoconfigured address matched. Now that we
! 1133: * are sure there is at least one matched address, we can
! 1134: * proceed to 5.5.3. (e): update the lifetimes according to the
! 1135: * "two hours" rule and the privacy extension.
! 1136: */
! 1137: #define TWOHOUR (120*60)
! 1138: /*
! 1139: * RFC2462 introduces the notion of StoredLifetime to the
! 1140: * "two hours" rule as follows:
! 1141: * the Lifetime associated with the previously autoconfigured
! 1142: * address.
! 1143: * Our interpretation of this definition is "the remaining
! 1144: * lifetime to expiration at the evaluation time". One might
! 1145: * be wondering if this interpretation is really conform to the
! 1146: * RFC, because the text can read that "Lifetimes" are never
! 1147: * decreased, and our definition of the "storedlifetime" below
! 1148: * essentially reduces the "Valid Lifetime" advertised in the
! 1149: * previous RA. But, this is due to the wording of the text,
! 1150: * and our interpretation is the same as an author's intention.
! 1151: * See the discussion in the IETF ipngwg ML in August 2001,
! 1152: * with the Subject "StoredLifetime in RFC 2462".
! 1153: */
! 1154: lt6_tmp = ifa6->ia6_lifetime;
! 1155: if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
! 1156: storedlifetime = ND6_INFINITE_LIFETIME;
! 1157: else if (time_second - ifa6->ia6_updatetime >
! 1158: lt6_tmp.ia6t_vltime) {
! 1159: /*
! 1160: * The case of "invalid" address. We should usually
! 1161: * not see this case.
! 1162: */
! 1163: storedlifetime = 0;
! 1164: } else
! 1165: storedlifetime = lt6_tmp.ia6t_vltime -
! 1166: (time_second - ifa6->ia6_updatetime);
! 1167: if (TWOHOUR < new->ndpr_vltime ||
! 1168: storedlifetime < new->ndpr_vltime) {
! 1169: lt6_tmp.ia6t_vltime = new->ndpr_vltime;
! 1170: } else if (storedlifetime <= TWOHOUR
! 1171: #if 0
! 1172: /*
! 1173: * This condition is logically redundant, so we just
! 1174: * omit it.
! 1175: * See IPng 6712, 6717, and 6721.
! 1176: */
! 1177: && new->ndpr_vltime <= storedlifetime
! 1178: #endif
! 1179: ) {
! 1180: if (auth) {
! 1181: lt6_tmp.ia6t_vltime = new->ndpr_vltime;
! 1182: }
! 1183: } else {
! 1184: /*
! 1185: * new->ndpr_vltime <= TWOHOUR &&
! 1186: * TWOHOUR < storedlifetime
! 1187: */
! 1188: lt6_tmp.ia6t_vltime = TWOHOUR;
! 1189: }
! 1190:
! 1191: /* The 2 hour rule is not imposed for preferred lifetime. */
! 1192: lt6_tmp.ia6t_pltime = new->ndpr_pltime;
! 1193:
! 1194: in6_init_address_ltimes(pr, <6_tmp);
! 1195:
! 1196: ifa6->ia6_lifetime = lt6_tmp;
! 1197: ifa6->ia6_updatetime = time_second;
! 1198: }
! 1199: if (ia6_match == NULL && new->ndpr_vltime) {
! 1200: /*
! 1201: * No address matched and the valid lifetime is non-zero.
! 1202: * Create a new address.
! 1203: */
! 1204: if ((ia6 = in6_ifadd(new)) != NULL) {
! 1205: /*
! 1206: * note that we should use pr (not new) for reference.
! 1207: */
! 1208: pr->ndpr_refcnt++;
! 1209: ia6->ia6_ndpr = pr;
! 1210:
! 1211: /*
! 1212: * A newly added address might affect the status
! 1213: * of other addresses, so we check and update it.
! 1214: * XXX: what if address duplication happens?
! 1215: */
! 1216: pfxlist_onlink_check();
! 1217: } else {
! 1218: /* just set an error. do not bark here. */
! 1219: error = EADDRNOTAVAIL; /* XXX: might be unused. */
! 1220: }
! 1221: }
! 1222:
! 1223: end:
! 1224: splx(s);
! 1225: return error;
! 1226: }
! 1227:
! 1228: /*
! 1229: * A supplement function used in the on-link detection below;
! 1230: * detect if a given prefix has a (probably) reachable advertising router.
! 1231: * XXX: lengthy function name...
! 1232: */
! 1233: static struct nd_pfxrouter *
! 1234: find_pfxlist_reachable_router(pr)
! 1235: struct nd_prefix *pr;
! 1236: {
! 1237: struct nd_pfxrouter *pfxrtr;
! 1238: struct rtentry *rt;
! 1239: struct llinfo_nd6 *ln;
! 1240:
! 1241: for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
! 1242: pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
! 1243: if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
! 1244: pfxrtr->router->ifp)) &&
! 1245: (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
! 1246: ND6_IS_LLINFO_PROBREACH(ln))
! 1247: break; /* found */
! 1248: }
! 1249:
! 1250: return (pfxrtr);
! 1251: }
! 1252:
! 1253: /*
! 1254: * Check if each prefix in the prefix list has at least one available router
! 1255: * that advertised the prefix (a router is "available" if its neighbor cache
! 1256: * entry is reachable or probably reachable).
! 1257: * If the check fails, the prefix may be off-link, because, for example,
! 1258: * we have moved from the network but the lifetime of the prefix has not
! 1259: * expired yet. So we should not use the prefix if there is another prefix
! 1260: * that has an available router.
! 1261: * But, if there is no prefix that has an available router, we still regards
! 1262: * all the prefixes as on-link. This is because we can't tell if all the
! 1263: * routers are simply dead or if we really moved from the network and there
! 1264: * is no router around us.
! 1265: */
! 1266: void
! 1267: pfxlist_onlink_check()
! 1268: {
! 1269: struct nd_prefix *pr;
! 1270: struct in6_ifaddr *ifa;
! 1271:
! 1272: /*
! 1273: * Check if there is a prefix that has a reachable advertising
! 1274: * router.
! 1275: */
! 1276: LIST_FOREACH(pr, &nd_prefix, ndpr_entry) {
! 1277: if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
! 1278: break;
! 1279: }
! 1280: if (pr != NULL || TAILQ_FIRST(&nd_defrouter) != NULL) {
! 1281: /*
! 1282: * There is at least one prefix that has a reachable router,
! 1283: * or at least a router which probably does not advertise
! 1284: * any prefixes. The latter would be the case when we move
! 1285: * to a new link where we have a router that does not provide
! 1286: * prefixes and we configure an address by hand.
! 1287: * Detach prefixes which have no reachable advertising
! 1288: * router, and attach other prefixes.
! 1289: */
! 1290: LIST_FOREACH(pr, &nd_prefix, ndpr_entry) {
! 1291: /* XXX: a link-local prefix should never be detached */
! 1292: if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
! 1293: continue;
! 1294:
! 1295: /*
! 1296: * we aren't interested in prefixes without the L bit
! 1297: * set.
! 1298: */
! 1299: if (pr->ndpr_raf_onlink == 0)
! 1300: continue;
! 1301:
! 1302: if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
! 1303: find_pfxlist_reachable_router(pr) == NULL)
! 1304: pr->ndpr_stateflags |= NDPRF_DETACHED;
! 1305: if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
! 1306: find_pfxlist_reachable_router(pr) != 0)
! 1307: pr->ndpr_stateflags &= ~NDPRF_DETACHED;
! 1308: }
! 1309: } else {
! 1310: /* there is no prefix that has a reachable router */
! 1311: LIST_FOREACH(pr, &nd_prefix, ndpr_entry) {
! 1312: if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
! 1313: continue;
! 1314:
! 1315: if (pr->ndpr_raf_onlink == 0)
! 1316: continue;
! 1317:
! 1318: if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
! 1319: pr->ndpr_stateflags &= ~NDPRF_DETACHED;
! 1320: }
! 1321: }
! 1322:
! 1323: /*
! 1324: * Remove each interface route associated with a (just) detached
! 1325: * prefix, and reinstall the interface route for a (just) attached
! 1326: * prefix. Note that all attempt of reinstallation does not
! 1327: * necessarily success, when a same prefix is shared among multiple
! 1328: * interfaces. Such cases will be handled in nd6_prefix_onlink,
! 1329: * so we don't have to care about them.
! 1330: */
! 1331: LIST_FOREACH(pr, &nd_prefix, ndpr_entry) {
! 1332: int e;
! 1333:
! 1334: if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
! 1335: continue;
! 1336:
! 1337: if (pr->ndpr_raf_onlink == 0)
! 1338: continue;
! 1339:
! 1340: if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
! 1341: (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
! 1342: if ((e = nd6_prefix_offlink(pr)) != 0) {
! 1343: nd6log((LOG_ERR,
! 1344: "pfxlist_onlink_check: failed to "
! 1345: "make %s/%d offlink, errno=%d\n",
! 1346: ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
! 1347: pr->ndpr_plen, e));
! 1348: }
! 1349: }
! 1350: if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
! 1351: (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
! 1352: pr->ndpr_raf_onlink) {
! 1353: if ((e = nd6_prefix_onlink(pr)) != 0) {
! 1354: nd6log((LOG_ERR,
! 1355: "pfxlist_onlink_check: failed to "
! 1356: "make %s/%d offlink, errno=%d\n",
! 1357: ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
! 1358: pr->ndpr_plen, e));
! 1359: }
! 1360: }
! 1361: }
! 1362:
! 1363: /*
! 1364: * Changes on the prefix status might affect address status as well.
! 1365: * Make sure that all addresses derived from an attached prefix are
! 1366: * attached, and that all addresses derived from a detached prefix are
! 1367: * detached. Note, however, that a manually configured address should
! 1368: * always be attached.
! 1369: * The precise detection logic is same as the one for prefixes.
! 1370: */
! 1371: for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
! 1372: if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
! 1373: continue;
! 1374:
! 1375: if (ifa->ia6_ndpr == NULL) {
! 1376: /*
! 1377: * This can happen when we first configure the address
! 1378: * (i.e. the address exists, but the prefix does not).
! 1379: * XXX: complicated relationships...
! 1380: */
! 1381: continue;
! 1382: }
! 1383:
! 1384: if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
! 1385: break;
! 1386: }
! 1387: if (ifa) {
! 1388: for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
! 1389: if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
! 1390: continue;
! 1391:
! 1392: if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
! 1393: continue;
! 1394:
! 1395: if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
! 1396: ifa->ia6_flags &= ~IN6_IFF_DETACHED;
! 1397: else
! 1398: ifa->ia6_flags |= IN6_IFF_DETACHED;
! 1399: }
! 1400: }
! 1401: else {
! 1402: for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
! 1403: if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
! 1404: continue;
! 1405:
! 1406: ifa->ia6_flags &= ~IN6_IFF_DETACHED;
! 1407: }
! 1408: }
! 1409: }
! 1410:
! 1411: int
! 1412: nd6_prefix_onlink(pr)
! 1413: struct nd_prefix *pr;
! 1414: {
! 1415: struct ifaddr *ifa;
! 1416: struct ifnet *ifp = pr->ndpr_ifp;
! 1417: struct sockaddr_in6 mask6;
! 1418: struct nd_prefix *opr;
! 1419: u_long rtflags;
! 1420: int error = 0;
! 1421: struct rtentry *rt = NULL;
! 1422:
! 1423: /* sanity check */
! 1424: if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
! 1425: nd6log((LOG_ERR,
! 1426: "nd6_prefix_onlink: %s/%d is already on-link\n",
! 1427: ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
! 1428: return (EEXIST);
! 1429: }
! 1430:
! 1431: /*
! 1432: * Add the interface route associated with the prefix. Before
! 1433: * installing the route, check if there's the same prefix on another
! 1434: * interface, and the prefix has already installed the interface route.
! 1435: * Although such a configuration is expected to be rare, we explicitly
! 1436: * allow it.
! 1437: */
! 1438: LIST_FOREACH(opr, &nd_prefix, ndpr_entry) {
! 1439: if (opr == pr)
! 1440: continue;
! 1441:
! 1442: if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
! 1443: continue;
! 1444:
! 1445: if (opr->ndpr_plen == pr->ndpr_plen &&
! 1446: in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
! 1447: &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
! 1448: return (0);
! 1449: }
! 1450:
! 1451: /*
! 1452: * We prefer link-local addresses as the associated interface address.
! 1453: */
! 1454: /* search for a link-local addr */
! 1455: ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
! 1456: IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
! 1457: if (ifa == NULL) {
! 1458: /* XXX: freebsd does not have ifa_ifwithaf */
! 1459: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
! 1460: if (ifa->ifa_addr->sa_family == AF_INET6)
! 1461: break;
! 1462: }
! 1463: /* should we care about ia6_flags? */
! 1464: }
! 1465: if (ifa == NULL) {
! 1466: /*
! 1467: * This can still happen, when, for example, we receive an RA
! 1468: * containing a prefix with the L bit set and the A bit clear,
! 1469: * after removing all IPv6 addresses on the receiving
! 1470: * interface. This should, of course, be rare though.
! 1471: */
! 1472: nd6log((LOG_NOTICE,
! 1473: "nd6_prefix_onlink: failed to find any ifaddr"
! 1474: " to add route for a prefix(%s/%d) on %s\n",
! 1475: ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
! 1476: pr->ndpr_plen, ifp->if_xname));
! 1477: return (0);
! 1478: }
! 1479:
! 1480: /*
! 1481: * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
! 1482: * ifa->ifa_rtrequest = nd6_rtrequest;
! 1483: */
! 1484: bzero(&mask6, sizeof(mask6));
! 1485: mask6.sin6_len = sizeof(mask6);
! 1486: mask6.sin6_addr = pr->ndpr_mask;
! 1487: /* rtrequest() will probably set RTF_UP, but we're not sure. */
! 1488: rtflags = ifa->ifa_flags | RTF_UP;
! 1489: if (nd6_need_cache(ifp)) {
! 1490: /* explicitly set in case ifa_flags does not set the flag. */
! 1491: rtflags |= RTF_CLONING;
! 1492: } else {
! 1493: /*
! 1494: * explicitly clear the cloning bit in case ifa_flags sets it.
! 1495: */
! 1496: rtflags &= ~RTF_CLONING;
! 1497: }
! 1498: error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
! 1499: ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt, 0);
! 1500: if (error == 0) {
! 1501: if (rt != NULL) /* this should be non NULL, though */
! 1502: nd6_rtmsg(RTM_ADD, rt);
! 1503: pr->ndpr_stateflags |= NDPRF_ONLINK;
! 1504: } else {
! 1505: nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
! 1506: " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
! 1507: "errno = %d\n",
! 1508: ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
! 1509: pr->ndpr_plen, ifp->if_xname,
! 1510: ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
! 1511: ip6_sprintf(&mask6.sin6_addr), rtflags, error));
! 1512: }
! 1513:
! 1514: if (rt != NULL)
! 1515: rt->rt_refcnt--;
! 1516:
! 1517: return (error);
! 1518: }
! 1519:
! 1520: int
! 1521: nd6_prefix_offlink(pr)
! 1522: struct nd_prefix *pr;
! 1523: {
! 1524: int error = 0;
! 1525: struct ifnet *ifp = pr->ndpr_ifp;
! 1526: struct nd_prefix *opr;
! 1527: struct sockaddr_in6 sa6, mask6;
! 1528: struct rtentry *rt = NULL;
! 1529:
! 1530: /* sanity check */
! 1531: if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
! 1532: nd6log((LOG_ERR,
! 1533: "nd6_prefix_offlink: %s/%d is already off-link\n",
! 1534: ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
! 1535: return (EEXIST);
! 1536: }
! 1537:
! 1538: bzero(&sa6, sizeof(sa6));
! 1539: sa6.sin6_family = AF_INET6;
! 1540: sa6.sin6_len = sizeof(sa6);
! 1541: bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
! 1542: sizeof(struct in6_addr));
! 1543: bzero(&mask6, sizeof(mask6));
! 1544: mask6.sin6_family = AF_INET6;
! 1545: mask6.sin6_len = sizeof(sa6);
! 1546: bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
! 1547: error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
! 1548: (struct sockaddr *)&mask6, 0, &rt, 0);
! 1549: if (error == 0) {
! 1550: pr->ndpr_stateflags &= ~NDPRF_ONLINK;
! 1551:
! 1552: /* report the route deletion to the routing socket. */
! 1553: if (rt != NULL)
! 1554: nd6_rtmsg(RTM_DELETE, rt);
! 1555:
! 1556: /*
! 1557: * There might be the same prefix on another interface,
! 1558: * the prefix which could not be on-link just because we have
! 1559: * the interface route (see comments in nd6_prefix_onlink).
! 1560: * If there's one, try to make the prefix on-link on the
! 1561: * interface.
! 1562: */
! 1563: LIST_FOREACH(opr, &nd_prefix, ndpr_entry) {
! 1564: if (opr == pr)
! 1565: continue;
! 1566:
! 1567: if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
! 1568: continue;
! 1569:
! 1570: /*
! 1571: * KAME specific: detached prefixes should not be
! 1572: * on-link.
! 1573: */
! 1574: if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
! 1575: continue;
! 1576:
! 1577: if (opr->ndpr_plen == pr->ndpr_plen &&
! 1578: in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
! 1579: &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
! 1580: int e;
! 1581:
! 1582: if ((e = nd6_prefix_onlink(opr)) != 0) {
! 1583: nd6log((LOG_ERR,
! 1584: "nd6_prefix_offlink: failed to "
! 1585: "recover a prefix %s/%d from %s "
! 1586: "to %s (errno = %d)\n",
! 1587: ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
! 1588: opr->ndpr_plen, ifp->if_xname,
! 1589: opr->ndpr_ifp->if_xname, e));
! 1590: }
! 1591: }
! 1592: }
! 1593: } else {
! 1594: /* XXX: can we still set the NDPRF_ONLINK flag? */
! 1595: nd6log((LOG_ERR,
! 1596: "nd6_prefix_offlink: failed to delete route: "
! 1597: "%s/%d on %s (errno = %d)\n",
! 1598: ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, ifp->if_xname,
! 1599: error));
! 1600: }
! 1601:
! 1602: if (rt != NULL) {
! 1603: if (rt->rt_refcnt <= 0) {
! 1604: /* XXX: we should free the entry ourselves. */
! 1605: rt->rt_refcnt++;
! 1606: rtfree(rt);
! 1607: }
! 1608: }
! 1609:
! 1610: return (error);
! 1611: }
! 1612:
! 1613: static struct in6_ifaddr *
! 1614: in6_ifadd(pr)
! 1615: struct nd_prefix *pr;
! 1616: {
! 1617: struct ifnet *ifp = pr->ndpr_ifp;
! 1618: struct ifaddr *ifa;
! 1619: struct in6_aliasreq ifra;
! 1620: struct in6_ifaddr *ia, *ib;
! 1621: int error, plen0;
! 1622: struct in6_addr mask;
! 1623: int prefixlen = pr->ndpr_plen;
! 1624:
! 1625: in6_prefixlen2mask(&mask, prefixlen);
! 1626:
! 1627: /*
! 1628: * find a link-local address (will be interface ID).
! 1629: * Is it really mandatory? Theoretically, a global or a site-local
! 1630: * address can be configured without a link-local address, if we
! 1631: * have a unique interface identifier...
! 1632: *
! 1633: * it is not mandatory to have a link-local address, we can generate
! 1634: * interface identifier on the fly. we do this because:
! 1635: * (1) it should be the easiest way to find interface identifier.
! 1636: * (2) RFC2462 5.4 suggesting the use of the same interface identifier
! 1637: * for multiple addresses on a single interface, and possible shortcut
! 1638: * of DAD. we omitted DAD for this reason in the past.
! 1639: * (3) a user can prevent autoconfiguration of global address
! 1640: * by removing link-local address by hand (this is partly because we
! 1641: * don't have other way to control the use of IPv6 on a interface.
! 1642: * this has been our design choice - cf. NRL's "ifconfig auto").
! 1643: * (4) it is easier to manage when an interface has addresses
! 1644: * with the same interface identifier, than to have multiple addresses
! 1645: * with different interface identifiers.
! 1646: */
! 1647: ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
! 1648: if (ifa)
! 1649: ib = (struct in6_ifaddr *)ifa;
! 1650: else
! 1651: return NULL;
! 1652:
! 1653: #if 0 /* don't care link local addr state, and always do DAD */
! 1654: /* if link-local address is not eligible, do not autoconfigure. */
! 1655: if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
! 1656: printf("in6_ifadd: link-local address not ready\n");
! 1657: return NULL;
! 1658: }
! 1659: #endif
! 1660:
! 1661: /* prefixlen + ifidlen must be equal to 128 */
! 1662: plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
! 1663: if (prefixlen != plen0) {
! 1664: nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
! 1665: "(prefix=%d ifid=%d)\n",
! 1666: ifp->if_xname, prefixlen, 128 - plen0));
! 1667: return NULL;
! 1668: }
! 1669:
! 1670: /* make ifaddr */
! 1671:
! 1672: bzero(&ifra, sizeof(ifra));
! 1673: /*
! 1674: * in6_update_ifa() does not use ifra_name, but we accurately set it
! 1675: * for safety.
! 1676: */
! 1677: strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name));
! 1678: ifra.ifra_addr.sin6_family = AF_INET6;
! 1679: ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
! 1680: /* prefix */
! 1681: bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
! 1682: sizeof(ifra.ifra_addr.sin6_addr));
! 1683: ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
! 1684: ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
! 1685: ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
! 1686: ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
! 1687:
! 1688: /* interface ID */
! 1689: ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
! 1690: (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
! 1691: ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
! 1692: (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
! 1693: ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
! 1694: (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
! 1695: ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
! 1696: (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
! 1697:
! 1698: /* new prefix mask. */
! 1699: ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
! 1700: ifra.ifra_prefixmask.sin6_family = AF_INET6;
! 1701: bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
! 1702: sizeof(ifra.ifra_prefixmask.sin6_addr));
! 1703:
! 1704: /*
! 1705: * lifetime.
! 1706: * XXX: in6_init_address_ltimes would override these values later.
! 1707: * We should reconsider this logic.
! 1708: */
! 1709: ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
! 1710: ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
! 1711:
! 1712: /* XXX: scope zone ID? */
! 1713:
! 1714: ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
! 1715:
! 1716: /* allocate ifaddr structure, link into chain, etc. */
! 1717: if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
! 1718: nd6log((LOG_ERR,
! 1719: "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
! 1720: ip6_sprintf(&ifra.ifra_addr.sin6_addr), ifp->if_xname,
! 1721: error));
! 1722: return (NULL); /* ifaddr must not have been allocated. */
! 1723: }
! 1724:
! 1725: ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
! 1726:
! 1727: return (ia); /* this is always non-NULL */
! 1728: }
! 1729:
! 1730: int
! 1731: in6_init_prefix_ltimes(struct nd_prefix *ndpr)
! 1732: {
! 1733:
! 1734: /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
! 1735: if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
! 1736: nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
! 1737: "(%d) is greater than valid lifetime(%d)\n",
! 1738: (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
! 1739: return (EINVAL);
! 1740: }
! 1741: if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
! 1742: ndpr->ndpr_preferred = 0;
! 1743: else
! 1744: ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
! 1745: if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
! 1746: ndpr->ndpr_expire = 0;
! 1747: else
! 1748: ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
! 1749:
! 1750: return 0;
! 1751: }
! 1752:
! 1753: static void
! 1754: in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
! 1755: {
! 1756:
! 1757: /* Valid lifetime must not be updated unless explicitly specified. */
! 1758: /* init ia6t_expire */
! 1759: if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
! 1760: lt6->ia6t_expire = 0;
! 1761: else {
! 1762: lt6->ia6t_expire = time_second;
! 1763: lt6->ia6t_expire += lt6->ia6t_vltime;
! 1764: }
! 1765:
! 1766: /* init ia6t_preferred */
! 1767: if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
! 1768: lt6->ia6t_preferred = 0;
! 1769: else {
! 1770: lt6->ia6t_preferred = time_second;
! 1771: lt6->ia6t_preferred += lt6->ia6t_pltime;
! 1772: }
! 1773: }
! 1774:
! 1775: /*
! 1776: * Delete all the routing table entries that use the specified gateway.
! 1777: * XXX: this function causes search through all entries of routing table, so
! 1778: * it shouldn't be called when acting as a router.
! 1779: */
! 1780: void
! 1781: rt6_flush(gateway, ifp)
! 1782: struct in6_addr *gateway;
! 1783: struct ifnet *ifp;
! 1784: {
! 1785: struct radix_node_head *rnh = rt_gettable(AF_INET6, 0);
! 1786: int s = splsoftnet();
! 1787:
! 1788: /* We'll care only link-local addresses */
! 1789: if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
! 1790: splx(s);
! 1791: return;
! 1792: }
! 1793: /* XXX: hack for KAME's link-local address kludge */
! 1794: gateway->s6_addr16[1] = htons(ifp->if_index);
! 1795:
! 1796: rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
! 1797: splx(s);
! 1798: }
! 1799:
! 1800: static int
! 1801: rt6_deleteroute(rn, arg)
! 1802: struct radix_node *rn;
! 1803: void *arg;
! 1804: {
! 1805: #define SIN6(s) ((struct sockaddr_in6 *)s)
! 1806: struct rtentry *rt = (struct rtentry *)rn;
! 1807: struct in6_addr *gate = (struct in6_addr *)arg;
! 1808:
! 1809: if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
! 1810: return (0);
! 1811:
! 1812: if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
! 1813: return (0);
! 1814:
! 1815: /*
! 1816: * Do not delete a static route.
! 1817: * XXX: this seems to be a bit ad-hoc. Should we consider the
! 1818: * 'cloned' bit instead?
! 1819: */
! 1820: if ((rt->rt_flags & RTF_STATIC) != 0)
! 1821: return (0);
! 1822:
! 1823: /*
! 1824: * We delete only host route. This means, in particular, we don't
! 1825: * delete default route.
! 1826: */
! 1827: if ((rt->rt_flags & RTF_HOST) == 0)
! 1828: return (0);
! 1829:
! 1830: return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
! 1831: rt_mask(rt), rt->rt_flags, 0, 0));
! 1832: #undef SIN6
! 1833: }
! 1834:
! 1835: int
! 1836: nd6_setdefaultiface(ifindex)
! 1837: int ifindex;
! 1838: {
! 1839: int error = 0;
! 1840:
! 1841: if (ifindex < 0 || if_indexlim <= ifindex)
! 1842: return (EINVAL);
! 1843: if (ifindex != 0 && !ifindex2ifnet[ifindex])
! 1844: return (EINVAL);
! 1845:
! 1846: if (nd6_defifindex != ifindex) {
! 1847: nd6_defifindex = ifindex;
! 1848: if (nd6_defifindex > 0) {
! 1849: nd6_defifp = ifindex2ifnet[nd6_defifindex];
! 1850: } else
! 1851: nd6_defifp = NULL;
! 1852: }
! 1853:
! 1854: return (error);
! 1855: }
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