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//==========================================================================
//
//      src/sys/netinet6/nd6_rtr.c
//
//==========================================================================
//####BSDCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from OpenBSD, 
// FreeBSD or other sources, and are covered by the appropriate
// copyright disclaimers included herein.
//
// Portions created by Red Hat are
// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
//
// -------------------------------------------
//
//####BSDCOPYRIGHTEND####
//==========================================================================
 
/*      $KAME: nd6_rtr.c,v 1.187 2001/12/18 02:01:25 itojun 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 <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/errno.h>
#include <sys/queue.h>
#ifdef __OpenBSD__
#include <dev/rndvar.h>
#endif
 
#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>
 
#ifdef MIP6
#include <netinet6/mip6.h>
#endif /* MIP6 */
 
#define SDL(s)  ((struct sockaddr_dl *)s)
 
static int rtpref __P((struct nd_defrouter *));
static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *));
static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *));
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_delreq __P((struct nd_defrouter *));
static void defrouter_addifreq __P((struct ifnet *));
static void defrouter_delifreq __P((void));
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;
static struct ifaddr *nd6_defif_installed = NULL;
 
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;
int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
 
/* RTPREF_MEDIUM has to be 0! */
#define RTPREF_HIGH     1
#define RTPREF_MEDIUM   0
#define RTPREF_LOW      (-1)
#define RTPREF_INVALID  (-2)
 
/*
 * 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;
 
        /*
         * We only accept RAs only when
         * the system-wide variable allows the acceptance, and
         * per-interface variable allows RAs on the receiving interface.
         */
        if (ip6_accept_rtadv == 0)
                goto freeit;
        if (!(nd_ifinfo[ifp->if_index].flags & ND6_IFF_ACCEPT_RTADV))
                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;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
        long time_second = time.tv_sec;
#endif
 
        Bzero(&dr0, sizeof(dr0));
        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) {
                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;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
                long time_second = time.tv_sec;
#endif
 
                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;
#ifdef MIP6
                        pr.ndpr_raf_router = (pi->nd_opt_pi_flags_reserved &
                                              ND_OPT_PI_FLAG_ROUTER) ? 1 : 0;
#endif /* MIP6 */
                        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);
                        pr.ndpr_lastupdate = time_second;
 
                        if (in6_init_prefix_ltimes(&pr))
                                continue; /* prefix lifetime init failed */
#ifdef MIP6
                        if (MIP6_IS_MN) {
                                if (mip6_prefix_list_update(&saddr6, &pr, dr, m)) {
                                        mip6log((LOG_ERR,
                                                 "%s:%d: "
                                                 "prefix info processing "
                                                 "failed\n",
                                                 __FILE__, __LINE__));
                                        goto freeit;
                                }
                        }
#endif /* MIP6 */
                        (void)prelist_update(&pr, dr, m);
                }
        }
 
#ifdef MIP6
        if (MIP6_IS_MN) {
                /* check reachability of all routers. */
                mip6_probe_routers();
        }
 
        /* update home agent list. */
        if ((MIP6_IS_MN || MIP6_IS_HA)
            && dr
            && (dr->flags & ND_RA_FLAG_HOME_AGENT)) {
                if (mip6_ha_list_update_hainfo(&mip6_ha_list,
                                               dr, ndopts.nd_opts_hai)) {
                        mip6log((LOG_ERR,
                                 "%s:%d: global HA list update failed\n",
                                 __FILE__, __LINE__));
                }
        }
        if (dr == NULL) {
                struct mip6_ha *mha;
 
                /* the home agent is shutting down. */
                mha = mip6_ha_list_find_withaddr(&mip6_ha_list, &saddr6);
                if (mha) {
                        if (mip6_ha_list_remove(&mip6_ha_list, mha)) {
                                mip6log((LOG_ERR,
                                         "%s:%d: HA entry remove failed.\n",
                                         __FILE__, __LINE__));
                        }
                }
        }
#endif /* MIP6 */
 
        /*
         * 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));
#if (defined(__bsdi__) && _BSDI_VERSION >= 199802) /* BSDI4 */
        /* maybe this is unnecessary */
        info.rti_flags = rt->rt_flags;
#endif
        info.rti_info[RTAX_DST] = rt_key(rt);
        info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
        info.rti_info[RTAX_NETMASK] = rt_mask(rt);
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
        info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addrlist->ifa_addr;
#else
        info.rti_info[RTAX_IFP] =
                (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist);
#endif
        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;
        int error;
 
        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;
 
#ifdef __NetBSD__
        s = splsoftnet();
#else
        s = splnet();
#endif
        error = 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--;
        }
        if (error == 0)
                new->installed = 1;
        splx(s);
        return;
}
 
/* Add a route to a given interface as default */
static void
defrouter_addifreq(ifp)
        struct ifnet *ifp;
{
        struct sockaddr_in6 def, mask;
        struct ifaddr *ifa;
        struct rtentry *newrt = NULL;
        int error, flags;
#if (defined(__bsdi__) && _BSDI_VERSION >= 199802)
        struct rt_addrinfo info;
#endif
 
        /* remove one if we have already installed one */
        if (nd6_defif_installed)
                defrouter_delifreq();
 
        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;
#if (defined(__bsdi__) && _BSDI_VERSION >= 199802)
        bzero(&info, sizeof(info));
        info.rti_info[RTAX_DST] = (struct sockaddr *)&def;
        info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)ifa->ifa_addr;
        info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&mask;
        info.rti_info[RTAX_IFA] = (struct sockaddr *)ifa->ifa_addr;
        info.rti_flags = flags;
        error = rtrequest1(RTM_ADD, &info, &newrt);
#else
        error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr,
                          (struct sockaddr *)&mask, flags, &newrt);
#endif
        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--;
                }
        }
 
        nd6_defif_installed = ifa;
        IFAREF(ifa);
}
 
/* Remove a default route points to interface */
static void
defrouter_delifreq()
{
        struct sockaddr_in6 def, mask;
        struct rtentry *oldrt = NULL;
 
        if (!nd6_defif_installed)
                return;
 
        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;
 
        rtrequest(RTM_DELETE, (struct sockaddr *)&def,
            (struct sockaddr *)nd6_defif_installed->ifa_addr,
            (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
        if (oldrt) {
                nd6_rtmsg(RTM_DELETE, oldrt);
                if (oldrt->rt_refcnt <= 0) {
                        /*
                         * XXX: borrowed from the RTM_DELETE case of
                         * rtrequest().
                         */
                        oldrt->rt_refcnt++;
                        rtfree(oldrt);
                }
        }
 
        IFAFREE(nd6_defif_installed);
        nd6_defif_installed = NULL;
}
 
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
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->installed) {
                deldr = dr;
                defrouter_delreq(dr);
        }
        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);
}
 
/*
 * Remove the default route for a given router.
 * This is just a subroutine function for defrouter_select(), and should
 * not be called from anywhere else.
 */
static void
defrouter_delreq(dr)
        struct nd_defrouter *dr;
{
        struct sockaddr_in6 def, mask, gw;
        struct rtentry *oldrt = NULL;
 
        Bzero(&def, sizeof(def));
        Bzero(&mask, sizeof(mask));
        Bzero(&gw, sizeof(gw));
 
        def.sin6_len = mask.sin6_len = gw.sin6_len =
            sizeof(struct sockaddr_in6);
        def.sin6_family = mask.sin6_family = gw.sin6_family = AF_INET6;
        if (dr)
                gw.sin6_addr = dr->rtaddr;
 
        rtrequest(RTM_DELETE, (struct sockaddr *)&def,
            dr ? (struct sockaddr *)&gw : NULL,
            (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
        if (oldrt) {
                nd6_rtmsg(RTM_DELETE, oldrt);
                if (oldrt->rt_refcnt <= 0) {
                        /*
                         * XXX: borrowed from the RTM_DELETE case of
                         * rtrequest().
                         */
                        oldrt->rt_refcnt++;
                        rtfree(oldrt);
                }
        }
 
        if (dr)
                dr->installed = 0;
}
 
/*
 * remove all default routes from default router list
 */
void
defrouter_reset()
{
        struct nd_defrouter *dr;
 
        for (dr = TAILQ_FIRST(&nd_defrouter); dr;
             dr = TAILQ_NEXT(dr, dr_entry))
                defrouter_delreq(dr);
        defrouter_delifreq();
 
        /*
         * XXX should we also nuke any default routers in the kernel, by
         * going through them by rtalloc1()?
         */
}
 
/*
 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
 * draft-ietf-ipngwg-router-selection:
 * 1) Routers that are reachable or probably reachable should be preferred.
 *    If we have more than one (probably) reachable router, prefer ones
 *    with the highest router preference.
 * 2) When no routers on the list are known to be reachable or
 *    probably reachable, routers SHOULD be selected in a round-robin
 *    fashion, regardless of router preference values.
 * 3) If the Default Router List is empty, assume that all
 *    destinations are on-link.
 *
 * We assume nd_defrouter is sorted by router preference value.
 * Since the code below covers both with and without router preference cases,
 * we do not need to classify the cases by ifdef.
 *
 * At this moment, we do not try to install more than one default router,
 * even when the multipath routing is available, because we're not sure about
 * the benefits for stub hosts comparing to the risk of making the code
 * complicated and the possibility of introducing bugs.
 */
void
defrouter_select()
{
#ifdef __NetBSD__
        int s = splsoftnet();
#else
        int s = splnet();
#endif
        struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
        struct rtentry *rt = NULL;
        struct llinfo_nd6 *ln = NULL;
 
        /*
         * This function should be called only when acting as an autoconfigured
         * host.  Although the remaining part of this function is not effective
         * if the node is not an autoconfigured host, we explicitly exclude
         * such cases here for safety.
         */
        if (ip6_forwarding || !ip6_accept_rtadv) {
                nd6log((LOG_WARNING,
                    "defrouter_select: called unexpectedly (forwarding=%d, "
                    "accept_rtadv=%d)\n", ip6_forwarding, ip6_accept_rtadv));
                splx(s);
                return;
        }
 
        /*
         * Let's handle easy case (3) first:
         * If default router list is empty, we should probably install
         * an interface route and assume that all destinations are on-link.
         */
        if (!TAILQ_FIRST(&nd_defrouter)) {
                /*
                 * XXX: The specification does not say this mechanism should
                 * be restricted to hosts, but this would be not useful
                 * (even harmful) for routers.
                 * This test is meaningless due to a test at the beginning of
                 * the function, but we intentionally keep it to make the note
                 * clear.
                 */
                if (!ip6_forwarding) {
                        if (nd6_defifp) {
                                /*
                                 * Install a route to the default interface
                                 * as default route.
                                 */
                                defrouter_addifreq(nd6_defifp);
                        } else {
                                /*
                                 * purge the existing route.
                                 * XXX: is this really correct?
                                 */
                                defrouter_delifreq();
                                nd6log((LOG_INFO, "defrouter_select: "
                                    "there's no default router and no default"
                                    " interface\n"));
                        }
                }
                splx(s);
                return;
        }
 
        /*
         * If we have a default route for the default interface, delete it.
         * Note that the existence of the route is checked in the delete
         * function.
         */
        defrouter_delifreq();
 
        /*
         * Search for a (probably) reachable router from the list.
         * We just pick up the first reachable one (if any), assuming that
         * the ordering rule of the list described in defrtrlist_update().
         */
        for (dr = TAILQ_FIRST(&nd_defrouter); dr;
             dr = TAILQ_NEXT(dr, dr_entry)) {
                if (!selected_dr &&
                    (rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
                    (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
                    ND6_IS_LLINFO_PROBREACH(ln)) {
                        selected_dr = dr;
                }
 
                if (dr->installed && !installed_dr)
                        installed_dr = dr;
                else if (dr->installed && installed_dr) {
                        /* this should not happen.  warn for diagnosis. */
                        log(LOG_ERR, "defrouter_select: more than one router"
                            " is installed\n");
                }
        }
        /*
         * If none of the default routers was found to be reachable,
         * round-robin the list regardless of preference.
         * Otherwise, if we have an installed router, check if the selected
         * (reachable) router should really be preferred to the installed one.
         * We only prefer the new router when the old one is not reachable
         * or when the new one has a really higher preference value.
         */
        if (!selected_dr) {
                if (!installed_dr || !TAILQ_NEXT(installed_dr, dr_entry))
                        selected_dr = TAILQ_FIRST(&nd_defrouter);
                else
                        selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
        } else if (installed_dr &&
                   (rt = nd6_lookup(&installed_dr->rtaddr, 0,
                                    installed_dr->ifp)) &&
                   (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
                   ND6_IS_LLINFO_PROBREACH(ln) &&
                   rtpref(selected_dr) <= rtpref(installed_dr)) {
                        selected_dr = installed_dr;
        }
 
        /*
         * If the selected router is different than the installed one,
         * remove the installed router and install the selected one.
         * Note that the selected router is never NULL here.
         */
        if (installed_dr != selected_dr) {
                if (installed_dr)
                        defrouter_delreq(installed_dr);
                defrouter_addreq(selected_dr);
        }
 
        splx(s);
        return;
}
 
/*
 * for default router selection
 * regards router-preference field as a 2-bit signed integer
 */
static int
rtpref(struct nd_defrouter *dr)
{
#ifdef RTPREF
        switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
        case ND_RA_FLAG_RTPREF_HIGH:
                return RTPREF_HIGH;
        case ND_RA_FLAG_RTPREF_MEDIUM:
        case ND_RA_FLAG_RTPREF_RSV:
                return RTPREF_MEDIUM;
        case ND_RA_FLAG_RTPREF_LOW:
                return RTPREF_LOW;
        default:
                /*
                 * This case should never happen.  If it did, it would mean a
                 * serious bug of kernel internal.  We thus always bark here.
                 * Or, can we even panic?
                 */
                log(LOG_ERR, "rtpref: impossible RA flag %x", dr->flags);
                return RTPREF_INVALID;
        }
        /* NOT REACH HERE */
#else
        return RTPREF_MEDIUM;
#endif
}
 
static struct nd_defrouter *
defrtrlist_update(new)
        struct nd_defrouter *new;
{
        struct nd_defrouter *dr, *n;
#ifdef __NetBSD__
        int s = splsoftnet();
#else
        int s = splnet();
#endif
 
        if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
                /* entry exists */
                if (new->rtlifetime == 0) {
                        defrtrlist_del(dr);
                        dr = NULL;
                } else {
                        int oldpref = rtpref(dr);
 
                        /* override */
                        dr->flags = new->flags; /* xxx flag check */
                        dr->rtlifetime = new->rtlifetime;
                        dr->expire = new->expire;
 
                        /*
                         * If the preference does not change, there's no need
                         * to sort the entries.
                         */
                        if (rtpref(new) == oldpref) {
                                splx(s);
                                return(dr);
                        }
 
                        /*
                         * preferred router may be changed, so relocate
                         * this router.
                         * XXX: calling TAILQ_REMOVE directly is a bad manner.
                         * However, since defrtrlist_del() has many side
                         * effects, we intentionally do so here.
                         * defrouter_select() below will handle routing
                         * changes later.
                         */
                        TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
                        n = dr;
                        goto insert;
                }
                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:
        /*
         * Insert the new router in the Default Router List;
         * The Default Router List should be in the descending order
         * of router-preferece.  Routers with the same preference are
         * sorted in the arriving time order.
         */
 
        /* insert at the end of the group */
        for (dr = TAILQ_FIRST(&nd_defrouter); dr;
             dr = TAILQ_NEXT(dr, dr_entry)) {
                if (rtpref(n) > rtpref(dr))
                        break;
        }
        if (dr)
                TAILQ_INSERT_BEFORE(dr, n, dr_entry);
        else
                TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
 
        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];
 
#ifdef __NetBSD__
        s = splsoftnet();
#else
        s = splnet();
#endif
        /* 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? */
 
#ifdef __NetBSD__
        s = splsoftnet();
#else
        s = splnet();
#endif
 
        /* 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;
#ifdef __NetBSD__
        int s = splsoftnet();
#else
        int s = splnet();
#endif
        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;
                        pr->ndpr_lastupdate = new->ndpr_lastupdate;
                }
 
                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;
 
                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 sure 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 end;
 
        /*
         * 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.
         */
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
        for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
#elif defined(__FreeBSD__) && __FreeBSD__ >= 4
        TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
#else
        for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next)
#endif
        {
                struct in6_ifaddr *ifa6;
                int ifa_plen;
                u_int32_t storedlifetime;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
                long time_second = time.tv_sec;
#endif
 
                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)
                /*
                 * RFC2462 introduces the notion of StoredLifetime to the
                 * "two hours" rule as follows:
                 *   the Lifetime associated with the previously autoconfigured
                 *   address.
                 * Our interpretation of this definition is "the remaining
                 * lifetime to expiration at the evaluation time".  One might
                 * be wondering if this interpretation is really conform to the
                 * RFC, because the text can read that "Lifetimes" are never
                 * decreased, and our definition of the "storedlifetime" below
                 * essentially reduces the "Valid Lifetime" advertised in the
                 * previous RA.  But, this is due to the wording of the text,
                 * and our interpretation is the same as an author's intention.
                 * See the discussion in the IETF ipngwg ML in August 2001,
                 * with the Subject "StoredLifetime in RFC 2462".
                 */
                lt6_tmp = ifa6->ia6_lifetime;
                if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
                        storedlifetime = ND6_INFINITE_LIFETIME;
                else if (time_second - ifa6->ia6_updatetime >
                         lt6_tmp.ia6t_vltime) {
                        /*
                         * The case of "invalid" address.  We should usually
                         * not see this case.
                         */
                        storedlifetime = 0;
                } else
                        storedlifetime = lt6_tmp.ia6t_vltime -
                                (time_second - ifa6->ia6_updatetime);
                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, &lt6_tmp);
 
                /*
                 * We need to treat lifetimes for temporary addresses
                 * differently, according to
                 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.3 (1);
                 * we only update the lifetimes when they are in the maximum
                 * intervals.
                 */
                if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
                        u_int32_t maxvltime, maxpltime;
 
                        if (ip6_temp_valid_lifetime >
                            (u_int32_t)(time_second - ifa6->ia6_createtime)) {
                                maxvltime = ip6_temp_valid_lifetime -
                                        (time_second - ifa6->ia6_createtime);
                        } else
                                maxvltime = 0;
                        if (ip6_temp_preferred_lifetime >
                            (u_int32_t)((time_second - ifa6->ia6_createtime) +
                                        ip6_desync_factor)) {
                                maxpltime = ip6_temp_preferred_lifetime -
                                        (time_second - ifa6->ia6_createtime) -
                                        ip6_desync_factor;
                        } else
                                maxpltime = 0;
 
                        if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
                            lt6_tmp.ia6t_vltime > maxvltime) {
                                lt6_tmp.ia6t_vltime = maxvltime;
                        }
                        if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
                            lt6_tmp.ia6t_pltime > maxpltime) {
                                lt6_tmp.ia6t_pltime = maxpltime;
                        }
                }
 
                ifa6->ia6_lifetime = lt6_tmp;
                ifa6->ia6_updatetime = time_second;
        }
        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) {
                        /*
                         * note that we should use pr (not new) for reference.
                         */
                        pr->ndpr_refcnt++;
                        ia6->ia6_ndpr = pr;
 
                        /*
                         * draft-ietf-ipngwg-temp-addresses-v2-00 3.3 (2).
                         * When a new public address is created as described
                         * in RFC2462, also create a new temporary address.
                         *
                         * draft-ietf-ipngwg-temp-addresses-v2-00 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. */
                }
        }
 
 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 != NULL || TAILQ_FIRST(&nd_defrouter) != NULL) {
                /*
                 * There is at least one prefix that has a reachable router,
                 * or at least a router which probably does not advertise
                 * any prefixes.  The latter would be the case when we move
                 * to a new link where we have a router that does not provide
                 * prefixes and we configure an address by hand.
                 * 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))
                        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;
                }
        }
 
#ifdef MIP6
        if (MIP6_IS_MN) {
                int coa_changed = 0;
 
                hif_save_location();
                coa_changed = mip6_select_coa2();
                (void)mip6_process_pfxlist_status_change(&hif_coa);
                if (coa_changed == 1)
                        mip6_process_movement();
                else
                        hif_restore_location();
        }
#endif /* MIP6 */
}
 
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 */
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
                for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
#elif defined(__FreeBSD__) && __FreeBSD__ >= 4
                TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
#else
                for (ifa = ifp->if_addrlist.tqh_first;
                     ifa;
                     ifa = ifa->ifa_list.tqe_next)
#endif
                {
                        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;
        /* rtrequest() will probably set RTF_UP, but we're not sure. */
        rtflags = ifa->ifa_flags | 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) {
                if (rt->rt_refcnt <= 0) {
                        /* XXX: we should free the entry ourselves. */
                        rt->rt_refcnt++;
                        rtfree(rt);
                }
        }
 
        return(error);
}
 
static struct in6_ifaddr *
in6_ifadd(pr)
        struct nd_prefix *pr;
{
        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_prefixlen2mask(&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.
         */
        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 */
        ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
            (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
        ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
            (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
        ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
            (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
        ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
            (ib->ia_addr.sin6_addr.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 */
 
        /* 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 is always non-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, *ia;
        struct in6_aliasreq ifra;
        int i, error;
        int trylimit = 3;       /* XXX: adhoc value */
        u_int32_t randid[2];
        u_int32_t vltime0, pltime0;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
        time_t time_second = (time_t)time.tv_sec;
#endif
 
        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:
        if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
                            (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
                            forcegen)) {
                nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
                        "random IFID\n"));
                return(EINVAL);
        }
        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]));
 
        /*
         * in6_get_tmpifid() quite likely provided a unique interface ID.
         * However, we may still have a chance to see collision, because
         * there may be a time lag between generation of the ID and generation
         * of the address.  So, we'll do one more sanity check.
         */
        for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
                if (SA6_ARE_ADDR_EQUAL(&ia->ia_addr,
                                       &ifra.ifra_addr)) {
                        if (trylimit-- == 0) {
                                /*
                                 * Give up.  Something strange should have
                                 * happened.
                                 */
                                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_vltime != ND6_INFINITE_LIFETIME) {
                vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
                        (ia0->ia6_lifetime.ia6t_vltime -
                         (time_second - ia0->ia6_updatetime));
                if (vltime0 > ip6_temp_valid_lifetime)
                        vltime0 = ip6_temp_valid_lifetime;
        } else
                vltime0 = ip6_temp_valid_lifetime;
        if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
                pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
                        (ia0->ia6_lifetime.ia6t_pltime -
                         (time_second - ia0->ia6_updatetime));
                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)
{
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
        long time_second = time.tv_sec;
#endif
 
        /* 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)
{
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
        long time_second = time.tv_sec;
#endif
 
        /* 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];
#ifdef __NetBSD__
        int s = splsoftnet();
#else
        int s = splnet();
#endif
 
        /* 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);
 
        rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
        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) {
#if defined(__FreeBSD__) && __FreeBSD__ >= 5
                        nd6_defifp = ifnet_byindex[nd6_defifindex];
#else
                        nd6_defifp = ifindex2ifnet[nd6_defifindex];
#endif
                } else
                        nd6_defifp = NULL;
 
                /*
                 * Rescan default router list, refresh default route(s).
                 */
                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);
}
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Line No.	Rev	Author	Line
1	27	unneback	`//==========================================================================`
2			`//`
3			`// src/sys/netinet6/nd6_rtr.c`
4			`//`
5			`//==========================================================================`
6			`//####BSDCOPYRIGHTBEGIN####`
7			`//`
8			`// -------------------------------------------`
9			`//`
10			`// Portions of this software may have been derived from OpenBSD,`
11			`// FreeBSD or other sources, and are covered by the appropriate`
12			`// copyright disclaimers included herein.`
13			`//`
14			`// Portions created by Red Hat are`
15			`// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.`
16			`//`
17			`// -------------------------------------------`
18			`//`
19			`//####BSDCOPYRIGHTEND####`
20			`//==========================================================================`
21
22			`/* $KAME: nd6_rtr.c,v 1.187 2001/12/18 02:01:25 itojun Exp $ */`
23
24			`/*`
25			`* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.`
26			`* All rights reserved.`
27			`*`
28			`* Redistribution and use in source and binary forms, with or without`
29			`* modification, are permitted provided that the following conditions`
30			`* are met:`
31			`* 1. Redistributions of source code must retain the above copyright`
32			`* notice, this list of conditions and the following disclaimer.`
33			`* 2. Redistributions in binary form must reproduce the above copyright`
34			`* notice, this list of conditions and the following disclaimer in the`
35			`* documentation and/or other materials provided with the distribution.`
36			`* 3. Neither the name of the project nor the names of its contributors`
37			`* may be used to endorse or promote products derived from this software`
38			`* without specific prior written permission.`
39			`*`
40			* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND