/* $FreeBSD$ */ /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define SDL(s) ((struct sockaddr_dl *)s) static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *)); static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *, struct in6_addr *)); static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *, struct nd_defrouter *)); static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *)); static void pfxrtr_del __P((struct nd_pfxrouter *)); static struct nd_pfxrouter *find_pfxlist_reachable_router __P((struct nd_prefix *)); static void defrouter_addifreq __P((struct ifnet *)); static void nd6_rtmsg __P((int, struct rtentry *)); static void in6_init_address_ltimes __P((struct nd_prefix *ndpr, struct in6_addrlifetime *lt6)); static int rt6_deleteroute __P((struct radix_node *, void *)); extern int nd6_recalc_reachtm_interval; static struct ifnet *nd6_defifp; int nd6_defifindex; int ip6_use_tempaddr = 0; int ip6_desync_factor; u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; /* * shorter lifetimes for debugging purposes. int ip6_temp_preferred_lifetime = 800; static int ip6_temp_valid_lifetime = 1800; */ int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; /* * Receive Router Solicitation Message - just for routers. * Router solicitation/advertisement is mostly managed by userland program * (rtadvd) so here we have no function like nd6_ra_output(). * * Based on RFC 2461 */ void nd6_rs_input(m, off, icmp6len) struct mbuf *m; int off, icmp6len; { struct ifnet *ifp = m->m_pkthdr.rcvif; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct nd_router_solicit *nd_rs; struct in6_addr saddr6 = ip6->ip6_src; #if 0 struct in6_addr daddr6 = ip6->ip6_dst; #endif char *lladdr = NULL; int lladdrlen = 0; #if 0 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL; struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; struct rtentry *rt = NULL; int is_newentry; #endif union nd_opts ndopts; /* If I'm not a router, ignore it. */ if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) goto freeit; /* Sanity checks */ if (ip6->ip6_hlim != 255) { nd6log((LOG_ERR, "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); goto bad; } /* * Don't update the neighbor cache, if src = ::. * This indicates that the src has no IP address assigned yet. */ if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) goto freeit; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len,); nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); if (nd_rs == NULL) { icmp6stat.icp6s_tooshort++; return; } #endif icmp6len -= sizeof(*nd_rs); nd6_option_init(nd_rs + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, "nd6_rs_input: invalid ND option, ignored\n")); /* nd6_options have incremented stats */ goto freeit; } if (ndopts.nd_opts_src_lladdr) { lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log((LOG_INFO, "nd6_rs_input: lladdrlen mismatch for %s " "(if %d, RS packet %d)\n", ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); goto bad; } nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); freeit: m_freem(m); return; bad: icmp6stat.icp6s_badrs++; m_freem(m); } /* * Receive Router Advertisement Message. * * Based on RFC 2461 * TODO: on-link bit on prefix information * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing */ void nd6_ra_input(m, off, icmp6len) struct mbuf *m; int off, icmp6len; { struct ifnet *ifp = m->m_pkthdr.rcvif; struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct nd_router_advert *nd_ra; struct in6_addr saddr6 = ip6->ip6_src; #if 0 struct in6_addr daddr6 = ip6->ip6_dst; int flags; /* = nd_ra->nd_ra_flags_reserved; */ int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); #endif union nd_opts ndopts; struct nd_defrouter *dr; if (ip6_accept_rtadv == 0) goto freeit; if (ip6->ip6_hlim != 255) { nd6log((LOG_ERR, "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); goto bad; } if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { nd6log((LOG_ERR, "nd6_ra_input: src %s is not link-local\n", ip6_sprintf(&saddr6))); goto bad; } #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, icmp6len,); nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); if (nd_ra == NULL) { icmp6stat.icp6s_tooshort++; return; } #endif icmp6len -= sizeof(*nd_ra); nd6_option_init(nd_ra + 1, icmp6len, &ndopts); if (nd6_options(&ndopts) < 0) { nd6log((LOG_INFO, "nd6_ra_input: invalid ND option, ignored\n")); /* nd6_options have incremented stats */ goto freeit; } { struct nd_defrouter dr0; u_int32_t advreachable = nd_ra->nd_ra_reachable; dr0.rtaddr = saddr6; dr0.flags = nd_ra->nd_ra_flags_reserved; dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); dr0.expire = time_second + dr0.rtlifetime; dr0.ifp = ifp; dr0.advint = 0; /* Mobile IPv6 */ dr0.advint_expire = 0; /* Mobile IPv6 */ dr0.advints_lost = 0; /* Mobile IPv6 */ /* unspecified or not? (RFC 2461 6.3.4) */ if (advreachable) { advreachable = ntohl(advreachable); if (advreachable <= MAX_REACHABLE_TIME && ndi->basereachable != advreachable) { ndi->basereachable = advreachable; ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ } } if (nd_ra->nd_ra_retransmit) ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); if (nd_ra->nd_ra_curhoplimit) ndi->chlim = nd_ra->nd_ra_curhoplimit; dr = defrtrlist_update(&dr0); } /* * prefix */ if (ndopts.nd_opts_pi) { struct nd_opt_hdr *pt; struct nd_opt_prefix_info *pi = NULL; struct nd_prefix pr; for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; pt = (struct nd_opt_hdr *)((caddr_t)pt + (pt->nd_opt_len << 3))) { if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) continue; pi = (struct nd_opt_prefix_info *)pt; if (pi->nd_opt_pi_len != 4) { nd6log((LOG_INFO, "nd6_ra_input: invalid option " "len %d for prefix information option, " "ignored\n", pi->nd_opt_pi_len)); continue; } if (128 < pi->nd_opt_pi_prefix_len) { nd6log((LOG_INFO, "nd6_ra_input: invalid prefix " "len %d for prefix information option, " "ignored\n", pi->nd_opt_pi_prefix_len)); continue; } if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { nd6log((LOG_INFO, "nd6_ra_input: invalid prefix " "%s, ignored\n", ip6_sprintf(&pi->nd_opt_pi_prefix))); continue; } /* aggregatable unicast address, rfc2374 */ if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 && pi->nd_opt_pi_prefix_len != 64) { nd6log((LOG_INFO, "nd6_ra_input: invalid prefixlen " "%d for rfc2374 prefix %s, ignored\n", pi->nd_opt_pi_prefix_len, ip6_sprintf(&pi->nd_opt_pi_prefix))); continue; } bzero(&pr, sizeof(pr)); pr.ndpr_prefix.sin6_family = AF_INET6; pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_AUTO) ? 1 : 0; pr.ndpr_plen = pi->nd_opt_pi_prefix_len; pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); if (in6_init_prefix_ltimes(&pr)) continue; /* prefix lifetime init failed */ (void)prelist_update(&pr, dr, m); } } /* * MTU */ if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); /* lower bound */ if (mtu < IPV6_MMTU) { nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " "mtu=%d sent from %s, ignoring\n", mtu, ip6_sprintf(&ip6->ip6_src))); goto skip; } /* upper bound */ if (ndi->maxmtu) { if (mtu <= ndi->maxmtu) { int change = (ndi->linkmtu != mtu); ndi->linkmtu = mtu; if (change) /* in6_maxmtu may change */ in6_setmaxmtu(); } else { nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " "mtu=%d sent from %s; " "exceeds maxmtu %d, ignoring\n", mtu, ip6_sprintf(&ip6->ip6_src), ndi->maxmtu)); } } else { nd6log((LOG_INFO, "nd6_ra_input: mtu option " "mtu=%d sent from %s; maxmtu unknown, " "ignoring\n", mtu, ip6_sprintf(&ip6->ip6_src))); } } skip: /* * Source link layer address */ { char *lladdr = NULL; int lladdrlen = 0; if (ndopts.nd_opts_src_lladdr) { lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; } if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { nd6log((LOG_INFO, "nd6_ra_input: lladdrlen mismatch for %s " "(if %d, RA packet %d)\n", ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); goto bad; } nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); /* * Installing a link-layer address might change the state of the * router's neighbor cache, which might also affect our on-link * detection of adveritsed prefixes. */ pfxlist_onlink_check(); } freeit: m_freem(m); return; bad: icmp6stat.icp6s_badra++; m_freem(m); } /* * default router list proccessing sub routines */ /* tell the change to user processes watching the routing socket. */ static void nd6_rtmsg(cmd, rt) int cmd; struct rtentry *rt; { struct rt_addrinfo info; bzero((caddr_t)&info, sizeof(info)); info.rti_info[RTAX_DST] = rt_key(rt); info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; info.rti_info[RTAX_NETMASK] = rt_mask(rt); info.rti_info[RTAX_IFP] = (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist); info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; rt_missmsg(cmd, &info, rt->rt_flags, 0); } void defrouter_addreq(new) struct nd_defrouter *new; { struct sockaddr_in6 def, mask, gate; struct rtentry *newrt = NULL; int s; Bzero(&def, sizeof(def)); Bzero(&mask, sizeof(mask)); Bzero(&gate, sizeof(gate)); def.sin6_len = mask.sin6_len = gate.sin6_len = sizeof(struct sockaddr_in6); def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; gate.sin6_addr = new->rtaddr; s = splnet(); (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY, &newrt); if (newrt) { nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ newrt->rt_refcnt--; } splx(s); return; } /* Add a route to a given interface as default */ void defrouter_addifreq(ifp) struct ifnet *ifp; { struct sockaddr_in6 def, mask; struct ifaddr *ifa; struct rtentry *newrt = NULL; int error, flags; bzero(&def, sizeof(def)); bzero(&mask, sizeof(mask)); def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); def.sin6_family = mask.sin6_family = AF_INET6; /* * Search for an ifaddr beloging to the specified interface. * XXX: An IPv6 address are required to be assigned on the interface. */ if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { nd6log((LOG_ERR, /* better error? */ "defrouter_addifreq: failed to find an ifaddr " "to install a route to interface %s\n", if_name(ifp))); return; } flags = ifa->ifa_flags; error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, (struct sockaddr *)&mask, flags, &newrt); if (error != 0) { nd6log((LOG_ERR, "defrouter_addifreq: failed to install a route to " "interface %s (errno = %d)\n", if_name(ifp), error)); if (newrt) /* maybe unnecessary, but do it for safety */ newrt->rt_refcnt--; } else { if (newrt) { nd6_rtmsg(RTM_ADD, newrt); newrt->rt_refcnt--; } } } struct nd_defrouter * defrouter_lookup(addr, ifp) struct in6_addr *addr; struct ifnet *ifp; { struct nd_defrouter *dr; for (dr = TAILQ_FIRST(&nd_defrouter); dr; dr = TAILQ_NEXT(dr, dr_entry)) { if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) return(dr); } return(NULL); /* search failed */ } void defrouter_delreq(dr, dofree) struct nd_defrouter *dr; int dofree; { struct sockaddr_in6 def, mask, gate; struct rtentry *oldrt = NULL; Bzero(&def, sizeof(def)); Bzero(&mask, sizeof(mask)); Bzero(&gate, sizeof(gate)); def.sin6_len = mask.sin6_len = gate.sin6_len = sizeof(struct sockaddr_in6); def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; gate.sin6_addr = dr->rtaddr; rtrequest(RTM_DELETE, (struct sockaddr *)&def, (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt); if (oldrt) { nd6_rtmsg(RTM_DELETE, oldrt); RTFREE(oldrt); } if (dofree) /* XXX: necessary? */ free(dr, M_IP6NDP); } void defrtrlist_del(dr) struct nd_defrouter *dr; { struct nd_defrouter *deldr = NULL; struct nd_prefix *pr; /* * Flush all the routing table entries that use the router * as a next hop. */ if (!ip6_forwarding && ip6_accept_rtadv) { /* above is a good condition? */ rt6_flush(&dr->rtaddr, dr->ifp); } if (dr == TAILQ_FIRST(&nd_defrouter)) deldr = dr; /* The router is primary. */ TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); /* * Also delete all the pointers to the router in each prefix lists. */ for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { struct nd_pfxrouter *pfxrtr; if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) pfxrtr_del(pfxrtr); } pfxlist_onlink_check(); /* * If the router is the primary one, choose a new one. * Note that defrouter_select() will remove the current gateway * from the routing table. */ if (deldr) defrouter_select(); free(dr, M_IP6NDP); } /* * Default Router Selection according to Section 6.3.6 of RFC 2461: * 1) Routers that are reachable or probably reachable should be * preferred. * 2) When no routers on the list are known to be reachable or * probably reachable, routers SHOULD be selected in a round-robin * fashion. * 3) If the Default Router List is empty, assume that all * destinations are on-link. */ void defrouter_select() { int s = splnet(); struct nd_defrouter *dr, anydr; struct rtentry *rt = NULL; struct llinfo_nd6 *ln = NULL; /* * Search for a (probably) reachable router from the list. */ for (dr = TAILQ_FIRST(&nd_defrouter); dr; dr = TAILQ_NEXT(dr, dr_entry)) { if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && ND6_IS_LLINFO_PROBREACH(ln)) { /* Got it, and move it to the head */ TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); break; } } if ((dr = TAILQ_FIRST(&nd_defrouter))) { /* * De-install the previous default gateway and install * a new one. * Note that if there is no reachable router in the list, * the head entry will be used anyway. * XXX: do we have to check the current routing table entry? */ bzero(&anydr, sizeof(anydr)); defrouter_delreq(&anydr, 0); defrouter_addreq(dr); } else { /* * The Default Router List is empty, so install the default * route to an inteface. * XXX: The specification does not say this mechanism should * be restricted to hosts, but this would be not useful * (even harmful) for routers. */ if (!ip6_forwarding) { /* * De-install the current default route * in advance. */ bzero(&anydr, sizeof(anydr)); defrouter_delreq(&anydr, 0); if (nd6_defifp) { /* * Install a route to the default interface * as default route. * XXX: we enable this for host only, because * this may override a default route installed * a user process (e.g. routing daemon) in a * router case. */ defrouter_addifreq(nd6_defifp); } else { nd6log((LOG_INFO, "defrouter_select: " "there's no default router and no default" " interface\n")); } } } splx(s); return; } static struct nd_defrouter * defrtrlist_update(new) struct nd_defrouter *new; { struct nd_defrouter *dr, *n; int s = splnet(); if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { /* entry exists */ if (new->rtlifetime == 0) { defrtrlist_del(dr); dr = NULL; } else { /* override */ dr->flags = new->flags; /* xxx flag check */ dr->rtlifetime = new->rtlifetime; dr->expire = new->expire; } splx(s); return(dr); } /* entry does not exist */ if (new->rtlifetime == 0) { splx(s); return(NULL); } n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); if (n == NULL) { splx(s); return(NULL); } bzero(n, sizeof(*n)); *n = *new; /* * Insert the new router at the end of the Default Router List. * If there is no other router, install it anyway. Otherwise, * just continue to use the current default router. */ TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); if (TAILQ_FIRST(&nd_defrouter) == n) defrouter_select(); splx(s); return(n); } static struct nd_pfxrouter * pfxrtr_lookup(pr, dr) struct nd_prefix *pr; struct nd_defrouter *dr; { struct nd_pfxrouter *search; for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { if (search->router == dr) break; } return(search); } static void pfxrtr_add(pr, dr) struct nd_prefix *pr; struct nd_defrouter *dr; { struct nd_pfxrouter *new; new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); if (new == NULL) return; bzero(new, sizeof(*new)); new->router = dr; LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); pfxlist_onlink_check(); } static void pfxrtr_del(pfr) struct nd_pfxrouter *pfr; { LIST_REMOVE(pfr, pfr_entry); free(pfr, M_IP6NDP); } struct nd_prefix * nd6_prefix_lookup(pr) struct nd_prefix *pr; { struct nd_prefix *search; for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { if (pr->ndpr_ifp == search->ndpr_ifp && pr->ndpr_plen == search->ndpr_plen && in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, &search->ndpr_prefix.sin6_addr, pr->ndpr_plen) ) { break; } } return(search); } int nd6_prelist_add(pr, dr, newp) struct nd_prefix *pr, **newp; struct nd_defrouter *dr; { struct nd_prefix *new = NULL; int i, s; new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); if (new == NULL) return ENOMEM; bzero(new, sizeof(*new)); *new = *pr; if (newp != NULL) *newp = new; /* initilization */ LIST_INIT(&new->ndpr_advrtrs); in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); /* make prefix in the canonical form */ for (i = 0; i < 4; i++) new->ndpr_prefix.sin6_addr.s6_addr32[i] &= new->ndpr_mask.s6_addr32[i]; s = splnet(); /* link ndpr_entry to nd_prefix list */ LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); splx(s); /* ND_OPT_PI_FLAG_ONLINK processing */ if (new->ndpr_raf_onlink) { int e; if ((e = nd6_prefix_onlink(new)) != 0) { nd6log((LOG_ERR, "nd6_prelist_add: failed to make " "the prefix %s/%d on-link on %s (errno=%d)\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); /* proceed anyway. XXX: is it correct? */ } } if (dr) { pfxrtr_add(new, dr); } return 0; } void prelist_remove(pr) struct nd_prefix *pr; { struct nd_pfxrouter *pfr, *next; int e, s; /* make sure to invalidate the prefix until it is really freed. */ pr->ndpr_vltime = 0; pr->ndpr_pltime = 0; #if 0 /* * Though these flags are now meaningless, we'd rather keep the value * not to confuse users when executing "ndp -p". */ pr->ndpr_raf_onlink = 0; pr->ndpr_raf_auto = 0; #endif if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && (e = nd6_prefix_offlink(pr)) != 0) { nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " "on %s, errno=%d\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); /* what should we do? */ } if (pr->ndpr_refcnt > 0) return; /* notice here? */ s = splnet(); /* unlink ndpr_entry from nd_prefix list */ LIST_REMOVE(pr, ndpr_entry); /* free list of routers that adversed the prefix */ for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { next = pfr->pfr_next; free(pfr, M_IP6NDP); } splx(s); free(pr, M_IP6NDP); pfxlist_onlink_check(); } int prelist_update(new, dr, m) struct nd_prefix *new; struct nd_defrouter *dr; /* may be NULL */ struct mbuf *m; { struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; struct ifaddr *ifa; struct ifnet *ifp = new->ndpr_ifp; struct nd_prefix *pr; int s = splnet(); int error = 0; int newprefix = 0; int auth; struct in6_addrlifetime lt6_tmp; auth = 0; if (m) { /* * Authenticity for NA consists authentication for * both IP header and IP datagrams, doesn't it ? */ #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) auth = (m->m_flags & M_AUTHIPHDR && m->m_flags & M_AUTHIPDGM) ? 1 : 0; #endif } if ((pr = nd6_prefix_lookup(new)) != NULL) { /* * nd6_prefix_lookup() ensures that pr and new have the same * prefix on a same interface. */ /* * Update prefix information. Note that the on-link (L) bit * and the autonomous (A) bit should NOT be changed from 1 * to 0. */ if (new->ndpr_raf_onlink == 1) pr->ndpr_raf_onlink = 1; if (new->ndpr_raf_auto == 1) pr->ndpr_raf_auto = 1; if (new->ndpr_raf_onlink) { pr->ndpr_vltime = new->ndpr_vltime; pr->ndpr_pltime = new->ndpr_pltime; pr->ndpr_preferred = new->ndpr_preferred; pr->ndpr_expire = new->ndpr_expire; } if (new->ndpr_raf_onlink && (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { int e; if ((e = nd6_prefix_onlink(pr)) != 0) { nd6log((LOG_ERR, "prelist_update: failed to make " "the prefix %s/%d on-link on %s " "(errno=%d)\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); /* proceed anyway. XXX: is it correct? */ } } if (dr && pfxrtr_lookup(pr, dr) == NULL) pfxrtr_add(pr, dr); } else { struct nd_prefix *newpr = NULL; newprefix = 1; if (new->ndpr_vltime == 0) goto end; if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) goto end; bzero(&new->ndpr_addr, sizeof(struct in6_addr)); error = nd6_prelist_add(new, dr, &newpr); if (error != 0 || newpr == NULL) { nd6log((LOG_NOTICE, "prelist_update: " "nd6_prelist_add failed for %s/%d on %s " "errno=%d, returnpr=%p\n", ip6_sprintf(&new->ndpr_prefix.sin6_addr), new->ndpr_plen, if_name(new->ndpr_ifp), error, newpr)); goto end; /* we should just give up in this case. */ } /* * XXX: from the ND point of view, we can ignore a prefix * with the on-link bit being zero. However, we need a * prefix structure for references from autoconfigured * addresses. Thus, we explicitly make suret that the prefix * itself expires now. */ if (newpr->ndpr_raf_onlink == 0) { newpr->ndpr_vltime = 0; newpr->ndpr_pltime = 0; in6_init_prefix_ltimes(newpr); } pr = newpr; } /* * Address autoconfiguration based on Section 5.5.3 of RFC 2462. * Note that pr must be non NULL at this point. */ /* 5.5.3 (a). Ignore the prefix without the A bit set. */ if (!new->ndpr_raf_auto) goto afteraddrconf; /* * 5.5.3 (b). the link-local prefix should have been ignored in * nd6_ra_input. */ /* * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. * This should have been done in nd6_ra_input. */ /* * 5.5.3 (d). If the prefix advertised does not match the prefix of an * address already in the list, and the Valid Lifetime is not 0, * form an address. Note that even a manually configured address * should reject autoconfiguration of a new address. */ TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { struct in6_ifaddr *ifa6; int ifa_plen; u_int32_t storedlifetime; if (ifa->ifa_addr->sa_family != AF_INET6) continue; ifa6 = (struct in6_ifaddr *)ifa; /* * Spec is not clear here, but I believe we should concentrate * on unicast (i.e. not anycast) addresses. * XXX: other ia6_flags? detached or duplicated? */ if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) continue; ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); if (ifa_plen != new->ndpr_plen || !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, &new->ndpr_prefix.sin6_addr, ifa_plen)) continue; if (ia6_match == NULL) /* remember the first one */ ia6_match = ifa6; if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0) continue; /* * An already autoconfigured address matched. Now that we * are sure there is at least one matched address, we can * proceed to 5.5.3. (e): update the lifetimes according to the * "two hours" rule and the privacy extension. */ #define TWOHOUR (120*60) lt6_tmp = ifa6->ia6_lifetime; storedlifetime = IFA6_IS_INVALID(ifa6) ? 0 : (lt6_tmp.ia6t_expire - time_second); if (TWOHOUR < new->ndpr_vltime || storedlifetime < new->ndpr_vltime) { lt6_tmp.ia6t_vltime = new->ndpr_vltime; } else if (storedlifetime <= TWOHOUR #if 0 /* * This condition is logically redundant, so we just * omit it. * See IPng 6712, 6717, and 6721. */ && new->ndpr_vltime <= storedlifetime #endif ) { if (auth) { lt6_tmp.ia6t_vltime = new->ndpr_vltime; } } else { /* * new->ndpr_vltime <= TWOHOUR && * TWOHOUR < storedlifetime */ lt6_tmp.ia6t_vltime = TWOHOUR; } /* The 2 hour rule is not imposed for preferred lifetime. */ lt6_tmp.ia6t_pltime = new->ndpr_pltime; in6_init_address_ltimes(pr, <6_tmp); /* * When adjusting the lifetimes of an existing temporary * address, only lower the lifetimes. * RFC 3041 3.3. (1). * XXX: how should we modify ia6t_[pv]ltime? */ if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { if (lt6_tmp.ia6t_expire == 0 || /* no expire */ lt6_tmp.ia6t_expire > ifa6->ia6_lifetime.ia6t_expire) { lt6_tmp.ia6t_expire = ifa6->ia6_lifetime.ia6t_expire; } if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ lt6_tmp.ia6t_preferred > ifa6->ia6_lifetime.ia6t_preferred) { lt6_tmp.ia6t_preferred = ifa6->ia6_lifetime.ia6t_preferred; } } ifa6->ia6_lifetime = lt6_tmp; } if (ia6_match == NULL && new->ndpr_vltime) { /* * No address matched and the valid lifetime is non-zero. * Create a new address. */ if ((ia6 = in6_ifadd(new, NULL)) != NULL) { /* * note that we should use pr (not new) for reference. */ pr->ndpr_refcnt++; ia6->ia6_ndpr = pr; #if 0 /* XXXYYY Don't do this, according to Jinmei. */ pr->ndpr_addr = new->ndpr_addr; #endif /* * RFC 3041 3.3 (2). * When a new public address is created as described * in RFC2462, also create a new temporary address. * * RFC 3041 3.5. * When an interface connects to a new link, a new * randomized interface identifier should be generated * immediately together with a new set of temporary * addresses. Thus, we specifiy 1 as the 2nd arg of * in6_tmpifadd(). */ if (ip6_use_tempaddr) { int e; if ((e = in6_tmpifadd(ia6, 1)) != 0) { nd6log((LOG_NOTICE, "prelist_update: " "failed to create a temporary " "address, errno=%d\n", e)); } } /* * A newly added address might affect the status * of other addresses, so we check and update it. * XXX: what if address duplication happens? */ pfxlist_onlink_check(); } else { /* just set an error. do not bark here. */ error = EADDRNOTAVAIL; /* XXX: might be unused. */ } } afteraddrconf: end: splx(s); return error; } /* * A supplement function used in the on-link detection below; * detect if a given prefix has a (probably) reachable advertising router. * XXX: lengthy function name... */ static struct nd_pfxrouter * find_pfxlist_reachable_router(pr) struct nd_prefix *pr; { struct nd_pfxrouter *pfxrtr; struct rtentry *rt; struct llinfo_nd6 *ln; for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp)) && (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && ND6_IS_LLINFO_PROBREACH(ln)) break; /* found */ } return(pfxrtr); } /* * Check if each prefix in the prefix list has at least one available router * that advertised the prefix (a router is "available" if its neighbor cache * entry is reachable or probably reachable). * If the check fails, the prefix may be off-link, because, for example, * we have moved from the network but the lifetime of the prefix has not * expired yet. So we should not use the prefix if there is another prefix * that has an available router. * But, if there is no prefix that has an available router, we still regards * all the prefixes as on-link. This is because we can't tell if all the * routers are simply dead or if we really moved from the network and there * is no router around us. */ void pfxlist_onlink_check() { struct nd_prefix *pr; struct in6_ifaddr *ifa; /* * Check if there is a prefix that has a reachable advertising * router. */ for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) break; } if (pr) { /* * There is at least one prefix that has a reachable router. * Detach prefixes which have no reachable advertising * router, and attach other prefixes. */ for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { /* XXX: a link-local prefix should never be detached */ if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) continue; /* * we aren't interested in prefixes without the L bit * set. */ if (pr->ndpr_raf_onlink == 0) continue; if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && find_pfxlist_reachable_router(pr) == NULL) pr->ndpr_stateflags |= NDPRF_DETACHED; if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && find_pfxlist_reachable_router(pr) != 0) pr->ndpr_stateflags &= ~NDPRF_DETACHED; } } else { /* there is no prefix that has a reachable router */ for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) continue; if (pr->ndpr_raf_onlink == 0) continue; if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0) pr->ndpr_stateflags &= ~NDPRF_DETACHED; } } /* * Remove each interface route associated with a (just) detached * prefix, and reinstall the interface route for a (just) attached * prefix. Note that all attempt of reinstallation does not * necessarily success, when a same prefix is shared among multiple * interfaces. Such cases will be handled in nd6_prefix_onlink, * so we don't have to care about them. */ for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { int e; if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) continue; if (pr->ndpr_raf_onlink == 0) continue; if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { if ((e = nd6_prefix_offlink(pr)) != 0) { nd6log((LOG_ERR, "pfxlist_onlink_check: failed to " "make %s/%d offlink, errno=%d\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, e)); } } if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && pr->ndpr_raf_onlink) { if ((e = nd6_prefix_onlink(pr)) != 0) { nd6log((LOG_ERR, "pfxlist_onlink_check: failed to " "make %s/%d offlink, errno=%d\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, e)); } } } /* * Changes on the prefix status might affect address status as well. * Make sure that all addresses derived from an attached prefix are * attached, and that all addresses derived from a detached prefix are * detached. Note, however, that a manually configured address should * always be attached. * The precise detection logic is same as the one for prefixes. */ for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) continue; if (ifa->ia6_ndpr == NULL) { /* * This can happen when we first configure the address * (i.e. the address exists, but the prefix does not). * XXX: complicated relationships... */ continue; } if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) break; } if (ifa) { for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) continue; if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ continue; if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) ifa->ia6_flags &= ~IN6_IFF_DETACHED; else ifa->ia6_flags |= IN6_IFF_DETACHED; } } else { for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) continue; ifa->ia6_flags &= ~IN6_IFF_DETACHED; } } } int nd6_prefix_onlink(pr) struct nd_prefix *pr; { struct ifaddr *ifa; struct ifnet *ifp = pr->ndpr_ifp; struct sockaddr_in6 mask6; struct nd_prefix *opr; u_long rtflags; int error = 0; struct rtentry *rt = NULL; /* sanity check */ if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { nd6log((LOG_ERR, "nd6_prefix_onlink: %s/%d is already on-link\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); return(EEXIST)); } /* * Add the interface route associated with the prefix. Before * installing the route, check if there's the same prefix on another * interface, and the prefix has already installed the interface route. * Although such a configuration is expected to be rare, we explicitly * allow it. */ for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { if (opr == pr) continue; if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) continue; if (opr->ndpr_plen == pr->ndpr_plen && in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) return(0); } /* * We prefer link-local addresses as the associated interface address. */ /* search for a link-local addr */ ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, IN6_IFF_NOTREADY| IN6_IFF_ANYCAST); if (ifa == NULL) { /* XXX: freebsd does not have ifa_ifwithaf */ TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == AF_INET6) break; } /* should we care about ia6_flags? */ } if (ifa == NULL) { /* * This can still happen, when, for example, we receive an RA * containing a prefix with the L bit set and the A bit clear, * after removing all IPv6 addresses on the receiving * interface. This should, of course, be rare though. */ nd6log((LOG_NOTICE, "nd6_prefix_onlink: failed to find any ifaddr" " to add route for a prefix(%s/%d) on %s\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(ifp))); return(0); } /* * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. * ifa->ifa_rtrequest = nd6_rtrequest; */ bzero(&mask6, sizeof(mask6)); mask6.sin6_len = sizeof(mask6); mask6.sin6_addr = pr->ndpr_mask; rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; if (nd6_need_cache(ifp)) { /* explicitly set in case ifa_flags does not set the flag. */ rtflags |= RTF_CLONING; } else { /* * explicitly clear the cloning bit in case ifa_flags sets it. */ rtflags &= ~RTF_CLONING; } error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt); if (error == 0) { if (rt != NULL) /* this should be non NULL, though */ nd6_rtmsg(RTM_ADD, rt); pr->ndpr_stateflags |= NDPRF_ONLINK; } else { nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " "errno = %d\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen, if_name(ifp), ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), ip6_sprintf(&mask6.sin6_addr), rtflags, error)); } if (rt != NULL) rt->rt_refcnt--; return(error); } int nd6_prefix_offlink(pr) struct nd_prefix *pr; { int error = 0; struct ifnet *ifp = pr->ndpr_ifp; struct nd_prefix *opr; struct sockaddr_in6 sa6, mask6; struct rtentry *rt = NULL; /* sanity check */ if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { nd6log((LOG_ERR, "nd6_prefix_offlink: %s/%d is already off-link\n", ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); return(EEXIST); } bzero(&sa6, sizeof(sa6)); sa6.sin6_family = AF_INET6; sa6.sin6_len = sizeof(sa6); bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, sizeof(struct in6_addr)); bzero(&mask6, sizeof(mask6)); mask6.sin6_family = AF_INET6; mask6.sin6_len = sizeof(sa6); bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, (struct sockaddr *)&mask6, 0, &rt); if (error == 0) { pr->ndpr_stateflags &= ~NDPRF_ONLINK; /* report the route deletion to the routing socket. */ if (rt != NULL) nd6_rtmsg(RTM_DELETE, rt); /* * There might be the same prefix on another interface, * the prefix which could not be on-link just because we have * the interface route (see comments in nd6_prefix_onlink). * If there's one, try to make the prefix on-link on the * interface. */ for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { if (opr == pr) continue; if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) continue; /* * KAME specific: detached prefixes should not be * on-link. */ if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) continue; if (opr->ndpr_plen == pr->ndpr_plen && in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { int e; if ((e = nd6_prefix_onlink(opr)) != 0) { nd6log((LOG_ERR, "nd6_prefix_offlink: failed to " "recover a prefix %s/%d from %s " "to %s (errno = %d)\n", ip6_sprintf(&opr->ndpr_prefix.sin6_addr), opr->ndpr_plen, if_name(ifp), if_name(opr->ndpr_ifp), e)); } } } } else { /* XXX: can we still set the NDPRF_ONLINK flag? */ nd6log((LOG_ERR, "nd6_prefix_offlink: failed to delete route: " "%s/%d on %s (errno = %d)\n", ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), error)); } if (rt != NULL) RTFREE(rt); return(error); } static struct in6_ifaddr * in6_ifadd(pr, ifid) struct nd_prefix *pr; struct in6_addr *ifid; /* Mobile IPv6 addition */ { struct ifnet *ifp = pr->ndpr_ifp; struct ifaddr *ifa; struct in6_aliasreq ifra; struct in6_ifaddr *ia, *ib; int error, plen0; struct in6_addr mask; int prefixlen = pr->ndpr_plen; in6_len2mask(&mask, prefixlen); /* * find a link-local address (will be interface ID). * Is it really mandatory? Theoretically, a global or a site-local * address can be configured without a link-local address, if we * have a unique interface identifier... * * it is not mandatory to have a link-local address, we can generate * interface identifier on the fly. we do this because: * (1) it should be the easiest way to find interface identifier. * (2) RFC2462 5.4 suggesting the use of the same interface identifier * for multiple addresses on a single interface, and possible shortcut * of DAD. we omitted DAD for this reason in the past. * (3) a user can prevent autoconfiguration of global address * by removing link-local address by hand (this is partly because we * don't have other way to control the use of IPv6 on a interface. * this has been our design choice - cf. NRL's "ifconfig auto"). * (4) it is easier to manage when an interface has addresses * with the same interface identifier, than to have multiple addresses * with different interface identifiers. * * Mobile IPv6 addition: allow for caller to specify a wished interface * ID. This is to not break connections when moving addresses between * interfaces. */ ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ if (ifa) ib = (struct in6_ifaddr *)ifa; else return NULL; #if 0 /* don't care link local addr state, and always do DAD */ /* if link-local address is not eligible, do not autoconfigure. */ if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { printf("in6_ifadd: link-local address not ready\n"); return NULL; } #endif /* prefixlen + ifidlen must be equal to 128 */ plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); if (prefixlen != plen0) { nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " "(prefix=%d ifid=%d)\n", if_name(ifp), prefixlen, 128 - plen0)); return NULL; } /* make ifaddr */ bzero(&ifra, sizeof(ifra)); /* * in6_update_ifa() does not use ifra_name, but we accurately set it * for safety. */ strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); ifra.ifra_addr.sin6_family = AF_INET6; ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); /* prefix */ bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, sizeof(ifra.ifra_addr.sin6_addr)); ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; /* interface ID */ if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) ifid = &ib->ia_addr.sin6_addr; ifra.ifra_addr.sin6_addr.s6_addr32[0] |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); ifra.ifra_addr.sin6_addr.s6_addr32[1] |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); ifra.ifra_addr.sin6_addr.s6_addr32[2] |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); ifra.ifra_addr.sin6_addr.s6_addr32[3] |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); /* new prefix mask. */ ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); ifra.ifra_prefixmask.sin6_family = AF_INET6; bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, sizeof(ifra.ifra_prefixmask.sin6_addr)); /* * lifetime. * XXX: in6_init_address_ltimes would override these values later. * We should reconsider this logic. */ ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; /* XXX: scope zone ID? */ ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ /* * temporarily set the nopfx flag to avoid conflict. * XXX: we should reconsider the entire mechanism about prefix * manipulation. */ ifra.ifra_flags |= IN6_IFF_NOPFX; /* * keep the new address, regardless of the result of in6_update_ifa. * XXX: this address is now meaningless. * We should reconsider its role. */ pr->ndpr_addr = ifra.ifra_addr.sin6_addr; /* allocate ifaddr structure, link into chain, etc. */ if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { nd6log((LOG_ERR, "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), error)); return(NULL); /* ifaddr must not have been allocated. */ } ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); return(ia); /* this must NOT be NULL. */ } int in6_tmpifadd(ia0, forcegen) const struct in6_ifaddr *ia0; /* corresponding public address */ int forcegen; { struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; struct in6_ifaddr *newia; struct in6_aliasreq ifra; int i, error; int trylimit = 3; /* XXX: adhoc value */ u_int32_t randid[2]; time_t vltime0, pltime0; bzero(&ifra, sizeof(ifra)); strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); ifra.ifra_addr = ia0->ia_addr; /* copy prefix mask */ ifra.ifra_prefixmask = ia0->ia_prefixmask; /* clear the old IFID */ for (i = 0; i < 4; i++) { ifra.ifra_addr.sin6_addr.s6_addr32[i] &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; } again: in6_get_tmpifid(ifp, (u_int8_t *)randid, (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen); ifra.ifra_addr.sin6_addr.s6_addr32[2] |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); ifra.ifra_addr.sin6_addr.s6_addr32[3] |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); /* * If by chance the new temporary address is the same as an address * already assigned to the interface, generate a new randomized * interface identifier and repeat this step. * RFC 3041 3.3 (4). */ if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { if (trylimit-- == 0) { nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " "a unique random IFID\n")); return(EEXIST); } forcegen = 1; goto again; } /* * The Valid Lifetime is the lower of the Valid Lifetime of the * public address or TEMP_VALID_LIFETIME. * The Preferred Lifetime is the lower of the Preferred Lifetime * of the public address or TEMP_PREFERRED_LIFETIME - * DESYNC_FACTOR. */ if (ia0->ia6_lifetime.ia6t_expire != 0) { vltime0 = IFA6_IS_INVALID(ia0) ? 0 : (ia0->ia6_lifetime.ia6t_expire - time_second); if (vltime0 > ip6_temp_valid_lifetime) vltime0 = ip6_temp_valid_lifetime; } else vltime0 = ip6_temp_valid_lifetime; if (ia0->ia6_lifetime.ia6t_preferred != 0) { pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : (ia0->ia6_lifetime.ia6t_preferred - time_second); if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){ pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; } } else pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; ifra.ifra_lifetime.ia6t_vltime = vltime0; ifra.ifra_lifetime.ia6t_pltime = pltime0; /* * A temporary address is created only if this calculated Preferred * Lifetime is greater than REGEN_ADVANCE time units. */ if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) return(0); /* XXX: scope zone ID? */ ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); /* allocate ifaddr structure, link into chain, etc. */ if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) return(error); newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); if (newia == NULL) { /* XXX: can it happen? */ nd6log((LOG_ERR, "in6_tmpifadd: ifa update succeeded, but we got " "no ifaddr\n")); return(EINVAL); /* XXX */ } newia->ia6_ndpr = ia0->ia6_ndpr; newia->ia6_ndpr->ndpr_refcnt++; /* * A newly added address might affect the status of other addresses. * XXX: when the temporary address is generated with a new public * address, the onlink check is redundant. However, it would be safe * to do the check explicitly everywhere a new address is generated, * and, in fact, we surely need the check when we create a new * temporary address due to deprecation of an old temporary address. */ pfxlist_onlink_check(); return(0); } int in6_init_prefix_ltimes(struct nd_prefix *ndpr) { /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" "(%d) is greater than valid lifetime(%d)\n", (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); return (EINVAL); } if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) ndpr->ndpr_preferred = 0; else ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) ndpr->ndpr_expire = 0; else ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; return 0; } static void in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) { /* Valid lifetime must not be updated unless explicitly specified. */ /* init ia6t_expire */ if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) lt6->ia6t_expire = 0; else { lt6->ia6t_expire = time_second; lt6->ia6t_expire += lt6->ia6t_vltime; } /* init ia6t_preferred */ if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) lt6->ia6t_preferred = 0; else { lt6->ia6t_preferred = time_second; lt6->ia6t_preferred += lt6->ia6t_pltime; } } /* * Delete all the routing table entries that use the specified gateway. * XXX: this function causes search through all entries of routing table, so * it shouldn't be called when acting as a router. */ void rt6_flush(gateway, ifp) struct in6_addr *gateway; struct ifnet *ifp; { struct radix_node_head *rnh = rt_tables[AF_INET6]; int s = splnet(); /* We'll care only link-local addresses */ if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { splx(s); return; } /* XXX: hack for KAME's link-local address kludge */ gateway->s6_addr16[1] = htons(ifp->if_index); RADIX_NODE_HEAD_LOCK(rnh); rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); RADIX_NODE_HEAD_UNLOCK(rnh); splx(s); } static int rt6_deleteroute(rn, arg) struct radix_node *rn; void *arg; { #define SIN6(s) ((struct sockaddr_in6 *)s) struct rtentry *rt = (struct rtentry *)rn; struct in6_addr *gate = (struct in6_addr *)arg; if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) return(0); if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) return(0); /* * Do not delete a static route. * XXX: this seems to be a bit ad-hoc. Should we consider the * 'cloned' bit instead? */ if ((rt->rt_flags & RTF_STATIC) != 0) return(0); /* * We delete only host route. This means, in particular, we don't * delete default route. */ if ((rt->rt_flags & RTF_HOST) == 0) return(0); return(rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); #undef SIN6 } int nd6_setdefaultiface(ifindex) int ifindex; { int error = 0; if (ifindex < 0 || if_index < ifindex) return(EINVAL); if (nd6_defifindex != ifindex) { nd6_defifindex = ifindex; if (nd6_defifindex > 0) nd6_defifp = ifnet_byindex(nd6_defifindex); else nd6_defifp = NULL; /* * If the Default Router List is empty, install a route * to the specified interface as default or remove the default * route when the default interface becomes canceled. * The check for the queue is actually redundant, but * we do this here to avoid re-install the default route * if the list is NOT empty. */ if (TAILQ_FIRST(&nd_defrouter) == NULL) defrouter_select(); /* * Our current implementation assumes one-to-one maping between * interfaces and links, so it would be natural to use the * default interface as the default link. */ scope6_setdefault(nd6_defifp); } return(error); }