diff options
Diffstat (limited to 'sys/netinet6/nd6_rtr.c')
| -rw-r--r-- | sys/netinet6/nd6_rtr.c | 1982 |
1 files changed, 1982 insertions, 0 deletions
diff --git a/sys/netinet6/nd6_rtr.c b/sys/netinet6/nd6_rtr.c new file mode 100644 index 0000000..651a14d --- /dev/null +++ b/sys/netinet6/nd6_rtr.c @@ -0,0 +1,1982 @@ +/* $FreeBSD$ */ +/* $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 <sys/param.h> +#include <sys/systm.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/sockio.h> +#include <sys/time.h> +#include <sys/kernel.h> +#include <sys/errno.h> +#include <sys/syslog.h> +#include <sys/queue.h> + +#include <net/if.h> +#include <net/if_types.h> +#include <net/if_dl.h> +#include <net/route.h> +#include <net/radix.h> + +#include <netinet/in.h> +#include <netinet6/in6_var.h> +#include <netinet6/in6_ifattach.h> +#include <netinet/ip6.h> +#include <netinet6/ip6_var.h> +#include <netinet6/nd6.h> +#include <netinet/icmp6.h> +#include <netinet6/scope6_var.h> + +#include <net/net_osdep.h> + +#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; + + if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) + storedlifetime = ND6_INFINITE_LIFETIME; + else if (IFA6_IS_INVALID(ifa6)) + storedlifetime = 0; + else + storedlifetime = lt6_tmp.ia6t_expire - time_second; + + /* when not updating, keep the current stored lifetime. */ + lt6_tmp.ia6t_vltime = storedlifetime; + + 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 an 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) +{ + /* 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); +} |
