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[dragonfly.git] / sys / netinet6 / in6_prefix.c

/*      $FreeBSD: src/sys/netinet6/in6_prefix.c,v 1.4.2.3 2001/07/03 11:01:52 ume Exp $ */
/*      $DragonFly: src/sys/netinet6/in6_prefix.c,v 1.13 2008/03/07 11:34:21 sephe Exp $        */
/*      $KAME: in6_prefix.c,v 1.47 2001/03/25 08:41:39 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.
 */

/*
 * Copyright (c) 1982, 1986, 1991, 1993
 *      The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *      @(#)in.c        8.2 (Berkeley) 11/15/93
 */

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <sys/thread2.h>

#include <net/if.h>

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet6/in6_prefix.h>
#include <netinet6/ip6_var.h>

static MALLOC_DEFINE(M_IP6RR, "ip6rr", "IPv6 Router Renumbering Prefix");
static MALLOC_DEFINE(M_RR_ADDR, "rp_addr", "IPv6 Router Renumbering Ifid");

struct rr_prhead rr_prefix;

struct callout in6_rr_timer_ch;

#include <net/net_osdep.h>

static void     add_each_addr (struct socket *so, struct rr_prefix *rpp,
                                   struct rp_addr *rap);
static int create_ra_entry (struct rp_addr **rapp);
static int add_each_prefix (struct socket *so, struct rr_prefix *rpp);
static void free_rp_entries (struct rr_prefix *rpp);
static int link_stray_ia6s (struct rr_prefix *rpp);
static void     rp_remove (struct rr_prefix *rpp);

/*
 * Copy bits from src to tgt, from off bit for len bits.
 * Caller must specify collect tgtsize and srcsize.
 */
static void
bit_copy(char *tgt, u_int tgtsize, char *src, u_int srcsize,
         u_int off, u_int len)
{
        char *sp, *tp;

        /* arg values check */
        if (srcsize < off || srcsize < (off + len) ||
            tgtsize < off || tgtsize < (off + len)) {
                log(LOG_ERR,
                    "in6_prefix.c: bit_copy: invalid args: srcsize %d,\n"
                    "tgtsize %d, off %d, len %d\n", srcsize, tgtsize, off,
                    len);
                return;
        }

        /* search start point */
        for (sp = src, tp = tgt; off >= 8; sp++, tp++)
                off-=8;
        /* copy starting bits */
        if (off) {
                char setbit;
                int startbits;

                startbits = min((8 - off), len);

                for (setbit = (0x80 >> off); startbits;
                     setbit >>= 1, startbits--, len--)
                                *tp  |= (setbit & *sp);
                tp++;
                sp++;
        }
        /* copy midium bits */
        for (; len >= 8; sp++, tp++) {
                *tp = *sp;
                len-=8;
        }
        /* copy ending bits */
        if (len) {
                char setbit;

                for (setbit = 0x80; len; setbit >>= 1, len--)
                        *tp  |= (setbit & *sp);
        }
}

static struct ifprefix *
in6_prefixwithifp(struct ifnet *ifp, int plen, struct in6_addr *dst)
{
        struct ifprefix *ifpr;

        /* search matched prefix */
        for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
             ifpr = TAILQ_NEXT(ifpr, ifpr_list))
        {
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                if (plen <= in6_matchlen(dst, IFPR_IN6(ifpr)))
                        break;
        }
        return (ifpr);
}

/*
 * Search prefix which matches arg prefix as specified in
 * draft-ietf-ipngwg-router-renum-08.txt
 */
static struct rr_prefix *
search_matched_prefix(struct ifnet *ifp, struct in6_prefixreq *ipr)
{
        struct ifprefix *ifpr;
        struct ifaddr_container *ifac;
        struct ifaddr *ifa;
        struct rr_prefix *rpp;

        /* search matched prefix */
        ifpr = in6_prefixwithifp(ifp, ipr->ipr_plen,
                                 &ipr->ipr_prefix.sin6_addr);
        if (ifpr != NULL)
                return ifpr2rp(ifpr);

        /*
         * search matched addr, and then search prefix
         * which matches the addr
         */

        TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
                ifa = ifac->ifa;

                if (ifa->ifa_addr->sa_family != AF_INET6)
                        continue;
                if (ipr->ipr_plen <=
                    in6_matchlen(&ipr->ipr_prefix.sin6_addr, IFA_IN6(ifa)))
                        break;
        }
        if (ifac == NULL)
                return NULL;

        rpp = ifpr2rp(((struct in6_ifaddr *)ifa)->ia6_ifpr);
        if (rpp != 0)
                return rpp;

        for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
             ifpr = TAILQ_NEXT(ifpr, ifpr_list))
        {
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                if (ifpr->ifpr_plen <= in6_matchlen(IFA_IN6(ifa),
                                                    IFPR_IN6(ifpr)))
                        break;
        }
        if (ifpr != NULL)
                log(LOG_ERR,  "in6_prefix.c: search_matched_prefix: addr %s"
                    "has no pointer to prefix %s\n", ip6_sprintf(IFA_IN6(ifa)),
                    ip6_sprintf(IFPR_IN6(ifpr)));
        return ifpr2rp(ifpr);
}

/*
 * Search prefix which matches arg prefix as specified in
 * draft-ietf-ipngwg-router-renum-08.txt, and mark it if exists.
 * Return 1 if anything matched, and 0 if nothing matched.
 */
static int
mark_matched_prefixes(u_long cmd, struct ifnet *ifp, struct in6_rrenumreq *irr)
{
        struct ifaddr_container *ifac;
        struct ifprefix *ifpr;
        int matchlen, matched = 0;

        /* search matched prefixes */
        for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
             ifpr = TAILQ_NEXT(ifpr, ifpr_list))
        {
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                matchlen = in6_matchlen(&irr->irr_matchprefix.sin6_addr,
                                        IFPR_IN6(ifpr));
                if (irr->irr_m_minlen > ifpr->ifpr_plen ||
                    irr->irr_m_maxlen < ifpr->ifpr_plen ||
                    irr->irr_m_len > matchlen)
                        continue;
                matched = 1;
                ifpr2rp(ifpr)->rp_statef_addmark = 1;
                if (cmd == SIOCCIFPREFIX_IN6)
                        ifpr2rp(ifpr)->rp_statef_delmark = 1;
        }

        /*
         * search matched addr, and then search prefixes
         * which matche the addr
         */
        TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
                struct ifaddr *ifa = ifac->ifa;
                struct rr_prefix *rpp;

                if (ifa->ifa_addr->sa_family != AF_INET6)
                        continue;
                matchlen = in6_matchlen(&irr->irr_matchprefix.sin6_addr,
                                        IFA_IN6(ifa));
                if (irr->irr_m_minlen > matchlen ||
                    irr->irr_m_maxlen < matchlen || irr->irr_m_len > matchlen)
                        continue;
                rpp = ifpr2rp(((struct in6_ifaddr *)ifa)->ia6_ifpr);
                if (rpp != 0) {
                        matched = 1;
                        rpp->rp_statef_addmark = 1;
                        if (cmd == SIOCCIFPREFIX_IN6)
                                rpp->rp_statef_delmark = 1;
                } else
                        log(LOG_WARNING, "in6_prefix.c: mark_matched_prefixes:"
                            "no back pointer to ifprefix for %s. "
                            "ND autoconfigured addr?\n",
                            ip6_sprintf(IFA_IN6(ifa)));
        }
        return matched;
}

/*
 * Mark global prefixes as to be deleted.
 */
static void
delmark_global_prefixes(struct ifnet *ifp, struct in6_rrenumreq *irr)
{
        struct ifprefix *ifpr;

        /* search matched prefixes */
        for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
             ifpr = TAILQ_NEXT(ifpr, ifpr_list))
        {
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                /* mark delete global prefix */
                if (in6_addrscope(RP_IN6(ifpr2rp(ifpr))) ==
                    IPV6_ADDR_SCOPE_GLOBAL)
                        ifpr2rp(ifpr)->rp_statef_delmark = 1;
        }
}

/* Unmark prefixes */
static void
unmark_prefixes(struct ifnet *ifp)
{
        struct ifprefix *ifpr;

        /* unmark all prefix */
        for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
             ifpr = TAILQ_NEXT(ifpr, ifpr_list))
        {
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                /* unmark prefix */
                ifpr2rp(ifpr)->rp_statef_addmark = 0;
                ifpr2rp(ifpr)->rp_statef_delmark = 0;
        }
}

static void
init_prefix_ltimes(struct rr_prefix *rpp)
{

        if (rpp->rp_pltime == RR_INFINITE_LIFETIME ||
            rpp->rp_rrf_decrprefd == 0)
                rpp->rp_preferred = 0;
        else
                rpp->rp_preferred = time_second + rpp->rp_pltime;
        if (rpp->rp_vltime == RR_INFINITE_LIFETIME ||
            rpp->rp_rrf_decrvalid == 0)
                rpp->rp_expire = 0;
        else
                rpp->rp_expire = time_second + rpp->rp_vltime;
}

static int
rr_are_ifid_equal(struct in6_addr *ii1, struct in6_addr *ii2, int ii_len)
{
        int ii_bytelen, ii_bitlen;
        int p_bytelen, p_bitlen;

        /* sanity check */
        if (1 > ii_len ||
            ii_len > 124) { /* as RFC2373, prefix is at least 4 bit */
                log(LOG_ERR, "rr_are_ifid_equal: invalid ifid length(%d)\n",
                    ii_len);
                return (0);
        }

        ii_bytelen = ii_len / 8;
        ii_bitlen = ii_len % 8;

        p_bytelen = sizeof(struct in6_addr) - ii_bytelen - 1;
        p_bitlen = 8 - ii_bitlen;

        if (bcmp(ii1->s6_addr + p_bytelen + 1, ii2->s6_addr + p_bytelen + 1,
                 ii_bytelen))
                return (0);
        if (((ii1->s6_addr[p_bytelen] << p_bitlen) & 0xff) !=
            ((ii2->s6_addr[p_bytelen] << p_bitlen) & 0xff))
                return (0);

        return (1);
}

static struct rp_addr *
search_ifidwithprefix(struct rr_prefix *rpp, struct in6_addr *ifid)
{
        struct rp_addr *rap;

        LIST_FOREACH(rap, &rpp->rp_addrhead, ra_entry)
        {
                if (rr_are_ifid_equal(ifid, &rap->ra_ifid,
                                      (sizeof(struct in6_addr) << 3) -
                                      rpp->rp_plen))
                        break;
        }
        return rap;
}

static int
assign_ra_entry(struct rr_prefix *rpp, int iilen, struct in6_ifaddr *ia)
{
        int error = 0;
        struct rp_addr *rap;

        if ((error = create_ra_entry(&rap)) != 0)
                return error;

        /* copy interface id part */
        bit_copy((caddr_t)&rap->ra_ifid, sizeof(rap->ra_ifid) << 3,
                 (caddr_t)IA6_IN6(ia),
                 sizeof(*IA6_IN6(ia)) << 3, rpp->rp_plen, iilen);
        /* link to ia, and put into list */
        rap->ra_addr = ia;
        crit_enter();
        _IFAREF(&rap->ra_addr->ia_ifa, 0);
#if 0 /* Can't do this now, because rpp may be on th stack. should fix it? */
        ia->ia6_ifpr = rp2ifpr(rpp);
#endif
        LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
        crit_exit();

        return 0;
}

/*
 * add a link-local address to an interface.  we will add new interface address
 * (prefix database + new interface id).
 */
static int
in6_prefix_add_llifid(int iilen, struct in6_ifaddr *ia)
{
        struct rr_prefix *rpp;
        struct rp_addr *rap;
        struct socket so;
        int error;

        if ((error = create_ra_entry(&rap)) != 0)
                return (error);
        /* copy interface id part */
        bit_copy((caddr_t)&rap->ra_ifid, sizeof(rap->ra_ifid) << 3,
                 (caddr_t)IA6_IN6(ia), sizeof(*IA6_IN6(ia)) << 3,
                 64, (sizeof(rap->ra_ifid) << 3) - 64);
        /* XXX: init dummy so */
        bzero(&so, sizeof(so));
        /* insert into list */
        LIST_FOREACH(rpp, &rr_prefix, rp_entry)
        {
                /*
                 * do not attempt to add an address, if ifp does not match
                 */
                if (rpp->rp_ifp != ia->ia_ifp)
                        continue;

                crit_enter();
                LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
                crit_exit();
                add_each_addr(&so, rpp, rap);
        }
        return 0;
}

/*
 * add an address to an interface.  if the interface id portion is new,
 * we will add new interface address (prefix database + new interface id).
 */
int
in6_prefix_add_ifid(int iilen, struct in6_ifaddr *ia)
{
        int plen = (sizeof(*IA6_IN6(ia)) << 3) - iilen;
        struct ifprefix *ifpr;
        struct rp_addr *rap;
        int error = 0;

        if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
                return (in6_prefix_add_llifid(iilen, ia));
        ifpr = in6_prefixwithifp(ia->ia_ifp, plen, IA6_IN6(ia));
        if (ifpr == NULL) {
                struct rr_prefix rp;
                struct socket so;
                int pplen = (plen == 128) ? 64 : plen; /* XXX hardcoded 64 is bad */

                /* allocate a prefix for ia, with default properties */

                /* init rp */
                bzero(&rp, sizeof(rp));
                rp.rp_type = IN6_PREFIX_RR;
                rp.rp_ifp = ia->ia_ifp;
                rp.rp_plen = pplen;
                rp.rp_prefix.sin6_len = sizeof(rp.rp_prefix);
                rp.rp_prefix.sin6_family = AF_INET6;
                bit_copy((char *)RP_IN6(&rp), sizeof(*RP_IN6(&rp)) << 3,
                         (char *)&ia->ia_addr.sin6_addr,
                         sizeof(ia->ia_addr.sin6_addr) << 3,
                         0, pplen);
                rp.rp_vltime = rp.rp_pltime = RR_INFINITE_LIFETIME;
                rp.rp_raf_onlink = 1;
                rp.rp_raf_auto = 1;
                /* Is some FlagMasks for rrf necessary? */
                rp.rp_rrf_decrvalid = rp.rp_rrf_decrprefd = 0;
                rp.rp_origin = PR_ORIG_RR; /* can be renumbered */

                /* create ra_entry */
                error = link_stray_ia6s(&rp);
                if (error != 0) {
                        free_rp_entries(&rp);
                        return error;
                }

                /* XXX: init dummy so */
                bzero(&so, sizeof(so));

                error = add_each_prefix(&so, &rp);

                /* free each rp_addr entry */
                free_rp_entries(&rp);

                if (error != 0)
                        return error;

                /* search again */
                ifpr = in6_prefixwithifp(ia->ia_ifp, pplen, IA6_IN6(ia));
                if (ifpr == NULL)
                        return 0;
        }
        rap = search_ifidwithprefix(ifpr2rp(ifpr), IA6_IN6(ia));
        if (rap != NULL) {
                if (rap->ra_addr == NULL) {
                        rap->ra_addr = ia;
                        crit_enter();   /* XXX MP not MP safe */
                        _IFAREF(&rap->ra_addr->ia_ifa, 0);
                        crit_exit();
                } else if (rap->ra_addr != ia) {
                        /* There may be some inconsistencies between addrs. */
                        log(LOG_ERR, "ip6_prefix.c: addr %s/%d matched prefix"
                            " already has another ia %p(%s) on its ifid list\n",
                            ip6_sprintf(IA6_IN6(ia)), plen,
                            rap->ra_addr,
                            ip6_sprintf(IA6_IN6(rap->ra_addr)));
                        return EADDRINUSE /* XXX */;
                }
                ia->ia6_ifpr = ifpr;
                return 0;
        }
        error = assign_ra_entry(ifpr2rp(ifpr), iilen, ia);
        if (error == 0)
                ia->ia6_ifpr = ifpr;
        return (error);
}

void
in6_prefix_remove_ifid(int iilen, struct in6_ifaddr *ia)
{
        struct rp_addr *rap;

        if (ia->ia6_ifpr == NULL)
                return;
        rap = search_ifidwithprefix(ifpr2rp(ia->ia6_ifpr), IA6_IN6(ia));
        if (rap != NULL) {
                crit_enter();
                LIST_REMOVE(rap, ra_entry);
                if (rap->ra_addr)
                        _IFAFREE(&rap->ra_addr->ia_ifa, 0);
                crit_exit();
                kfree(rap, M_RR_ADDR);
        }

        if (LIST_EMPTY(&ifpr2rp(ia->ia6_ifpr)->rp_addrhead))
                rp_remove(ifpr2rp(ia->ia6_ifpr));
}

void
in6_purgeprefix(struct ifnet *ifp)
{
        struct ifprefix *ifpr, *nextifpr;

        /* delete prefixes before ifnet goes away */
        for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr;
             ifpr = nextifpr)
        {
                nextifpr = TAILQ_NEXT(ifpr, ifpr_list);
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                delete_each_prefix(ifpr2rp(ifpr), PR_ORIG_KERNEL);
        }
}

static void
add_each_addr(struct socket *so, struct rr_prefix *rpp, struct rp_addr *rap)
{
        struct in6_ifaddr *ia6;
        struct in6_aliasreq ifra;
        int error;

        /* init ifra */
        bzero(&ifra, sizeof(ifra));
        strncpy(ifra.ifra_name, if_name(rpp->rp_ifp), sizeof(ifra.ifra_name));
        ifra.ifra_addr.sin6_family = ifra.ifra_prefixmask.sin6_family =
                AF_INET6;
        ifra.ifra_addr.sin6_len = ifra.ifra_prefixmask.sin6_len =
                sizeof(ifra.ifra_addr);
        /* copy prefix part */
        bit_copy((char *)&ifra.ifra_addr.sin6_addr,
                 sizeof(ifra.ifra_addr.sin6_addr) << 3,
                 (char *)RP_IN6(rpp), sizeof(*RP_IN6(rpp)) << 3,
                 0, rpp->rp_plen);
        /* copy interface id part */
        bit_copy((char *)&ifra.ifra_addr.sin6_addr,
                 sizeof(ifra.ifra_addr.sin6_addr) << 3,
                 (char *)&rap->ra_ifid, sizeof(rap->ra_ifid) << 3,
                 rpp->rp_plen, (sizeof(rap->ra_ifid) << 3) - rpp->rp_plen);
        in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, rpp->rp_plen);
        /* don't care ifra_flags for now */

        /*
         * XXX: if we did this with finite lifetime values, the lifetimes would
         *      decrese in time and never incremented.
         *      we should need more clarifications on the prefix mechanism...
         */
        ifra.ifra_lifetime.ia6t_vltime = rpp->rp_vltime;
        ifra.ifra_lifetime.ia6t_pltime = rpp->rp_pltime;

        ia6 = in6ifa_ifpwithaddr(rpp->rp_ifp, &ifra.ifra_addr.sin6_addr);
        if (ia6 != NULL) {
                if (ia6->ia6_ifpr == NULL) {
                        crit_enter();   /* XXX MP not MP safe */
                        /* link this addr and the prefix each other */
                        if (rap->ra_addr)
                                _IFAFREE(&rap->ra_addr->ia_ifa, 0);
                        rap->ra_addr = ia6;
                        _IFAREF(&rap->ra_addr->ia_ifa, 0);
                        crit_exit();
                        ia6->ia6_ifpr = rp2ifpr(rpp);
                        return;
                }
                if (ia6->ia6_ifpr == rp2ifpr(rpp)) {
                        crit_enter();   /* XXX MP not MP safe */
                        if (rap->ra_addr)
                                _IFAFREE(&rap->ra_addr->ia_ifa, 0);
                        rap->ra_addr = ia6;
                        _IFAREF(&rap->ra_addr->ia_ifa, 0);
                        crit_exit();
                        return;
                }
                /*
                 * The addr is already assigned to other
                 * prefix.
                 * There may be some inconsistencies between
                 * prefixes.
                 * e.g. overraped prefixes with common starting
                 *      part and different plefixlen.
                 *      Or, completely duplicated prefixes?
                 * log it and return.
                 */
                log(LOG_ERR,
                    "in6_prefix.c: add_each_addr: addition of an addr %s/%d "
                    "failed because there is already another addr %s/%d\n",
                    ip6_sprintf(&ifra.ifra_addr.sin6_addr), rpp->rp_plen,
                    ip6_sprintf(IA6_IN6(ia6)),
                    in6_mask2len(&ia6->ia_prefixmask.sin6_addr, NULL));
                return;
        }
        /* propagate ANYCAST flag if it is set for ancestor addr */
        if (rap->ra_flags.anycast != 0)
                ifra.ifra_flags |= IN6_IFF_ANYCAST;
        error = in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, rpp->rp_ifp,
                            curthread);
        if (error != 0) {
                log(LOG_ERR, "in6_prefix.c: add_each_addr: addition of an addr"
                    "%s/%d failed because in6_control failed for error %d\n",
                    ip6_sprintf(&ifra.ifra_addr.sin6_addr), rpp->rp_plen,
                    error);
                return;
        }

        /*
         * link beween this addr and the prefix will be done
         * in in6_prefix_add_ifid
         */
}

static int
rrpr_update(struct socket *so, struct rr_prefix *new)
{
        struct rr_prefix *rpp;
        struct ifprefix *ifpr;
        struct rp_addr *rap;

        /* search existing prefix */
        for (ifpr = TAILQ_FIRST(&new->rp_ifp->if_prefixhead); ifpr;
             ifpr = TAILQ_NEXT(ifpr, ifpr_list))
        {
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                if (ifpr->ifpr_plen == new->rp_plen &&
                    in6_are_prefix_equal(IFPR_IN6(ifpr), RP_IN6(new),
                                         ifpr->ifpr_plen))
                        break;
        }
        rpp = ifpr2rp(ifpr);
        if (rpp != NULL) {
                /*
                 * We got a prefix which we have seen in the past.
                 */
                /*
                 * If the origin of the already-installed prefix is more
                 * preferable than the new one, ignore installation request.
                 */
                if (rpp->rp_origin > new->rp_origin)
                        return (EPERM);

                /* update prefix information */
                rpp->rp_flags.prf_ra = new->rp_flags.prf_ra;
                if (rpp->rp_origin >= PR_ORIG_RR)
                        rpp->rp_flags.prf_rr = new->rp_flags.prf_rr;
                rpp->rp_vltime = new->rp_vltime;
                rpp->rp_pltime = new->rp_pltime;
                rpp->rp_expire = new->rp_expire;
                rpp->rp_preferred = new->rp_preferred;
                rpp->rp_statef_delmark = 0; /* cancel deletion */
                /*
                 * Interface id related update.
                 *  add rp_addr entries in new into rpp, if they have not
                 *  been already included in rpp.
                 */
                while (!LIST_EMPTY(&new->rp_addrhead))
                {
                        rap = LIST_FIRST(&new->rp_addrhead);
                        LIST_REMOVE(rap, ra_entry);
                        if (search_ifidwithprefix(rpp, &rap->ra_ifid)
                            != NULL) {
                                if (rap->ra_addr) {
                                        crit_enter();   /* XXX MP not MP safe */
                                        _IFAFREE(&rap->ra_addr->ia_ifa, 0);
                                        crit_exit();
                                }
                                kfree(rap, M_RR_ADDR);
                                continue;
                        }
                        crit_enter();
                        LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
                        crit_exit();
                }
        } else {
                /*
                 * We got a fresh prefix.
                 */
                /* create new prefix */
                rpp = (struct rr_prefix *)kmalloc(sizeof(*rpp), M_IP6RR,
                                                 M_NOWAIT);
                if (rpp == NULL) {
                        log(LOG_ERR, "in6_prefix.c: rrpr_update:%d"
                            ": ENOBUFS for rr_prefix\n", __LINE__);
                        return (ENOBUFS);
                }
                /* initilization */
                *rpp = *new;
                LIST_INIT(&rpp->rp_addrhead);
                /*  move rp_addr entries of new to rpp */
                while (!LIST_EMPTY(&new->rp_addrhead))
                {
                        rap = LIST_FIRST(&new->rp_addrhead);
                        LIST_REMOVE(rap, ra_entry);
                        LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
                }

                /* let rp_ifpr.ifpr_prefix point rr_prefix. */
                rpp->rp_ifpr.ifpr_prefix = (struct sockaddr *)&rpp->rp_prefix;
                /* link rr_prefix entry to if_prefixlist */
                {
                        struct ifnet *ifp = rpp->rp_ifp;
                        struct ifprefix *ifpr;

                        if ((ifpr = TAILQ_FIRST(&ifp->if_prefixhead))
                            != NULL) {
                                for ( ; TAILQ_NEXT(ifpr, ifpr_list);
                                      ifpr = TAILQ_NEXT(ifpr, ifpr_list))
                                        continue;
                                TAILQ_NEXT(ifpr, ifpr_list) = rp2ifpr(rpp);
                        } else
                                TAILQ_FIRST(&ifp->if_prefixhead) =
                                        rp2ifpr(rpp);
                        rp2ifpr(rpp)->ifpr_type = IN6_PREFIX_RR;
                }
                /* link rr_prefix entry to rr_prefix list */
                crit_enter();
                LIST_INSERT_HEAD(&rr_prefix, rpp, rp_entry);
                crit_exit();
        }

        if (!new->rp_raf_auto)
                return 0;

        /*
         * Add an address for each interface id, if it is not yet
         * If it existed but not pointing to the prefix yet,
         * init the prefix pointer.
         */
        LIST_FOREACH(rap, &rpp->rp_addrhead, ra_entry)
        {
                if (rap->ra_addr != NULL) {
                        if (rap->ra_addr->ia6_ifpr == NULL)
                                rap->ra_addr->ia6_ifpr = rp2ifpr(rpp);
                        continue;
                }
                add_each_addr(so, rpp, rap);
        }
        return 0;
}

static int
add_each_prefix(struct socket *so, struct rr_prefix *rpp)
{
        init_prefix_ltimes(rpp);
        return (rrpr_update(so, rpp));
}

static void
rp_remove(struct rr_prefix *rpp)
{
        crit_enter();
        /* unlink rp_entry from if_prefixlist */
        {
                struct ifnet *ifp = rpp->rp_ifp;
                struct ifprefix *ifpr;

                if ((ifpr = TAILQ_FIRST(&ifp->if_prefixhead)) == rp2ifpr(rpp))
                        TAILQ_FIRST(&ifp->if_prefixhead) =
                                TAILQ_NEXT(ifpr, ifpr_list);
                else {
                        while (TAILQ_NEXT(ifpr, ifpr_list) != NULL &&
                               (TAILQ_NEXT(ifpr, ifpr_list) != rp2ifpr(rpp)))
                                ifpr = TAILQ_NEXT(ifpr, ifpr_list);
                        if (TAILQ_NEXT(ifpr, ifpr_list))
                                TAILQ_NEXT(ifpr, ifpr_list) =
                                        TAILQ_NEXT(rp2ifpr(rpp), ifpr_list);
                        else
                                kprintf("Couldn't unlink rr_prefix from ifp\n");
                }
        }
        /* unlink rp_entry from rr_prefix list */
        LIST_REMOVE(rpp, rp_entry);
        crit_exit();
        kfree(rpp, M_IP6RR);
}

static int
create_ra_entry(struct rp_addr **rapp)
{
        *rapp = (struct rp_addr *)kmalloc(sizeof(struct rp_addr), M_RR_ADDR,
                                         M_NOWAIT | M_ZERO);
        if (*rapp == NULL) {
                log(LOG_ERR, "in6_prefix.c: init_newprefix:%d: ENOBUFS"
                    "for rp_addr\n", __LINE__);
                return ENOBUFS;
        }

        return 0;
}

static int
init_newprefix(struct in6_rrenumreq *irr, struct ifprefix *ifpr,
               struct rr_prefix *rpp)
{
        struct rp_addr *orap;

        /* init rp */
        bzero(rpp, sizeof(*rpp));
        rpp->rp_type = IN6_PREFIX_RR;
        rpp->rp_ifp = ifpr->ifpr_ifp;
        rpp->rp_plen = ifpr->ifpr_plen;
        rpp->rp_prefix.sin6_len = sizeof(rpp->rp_prefix);
        rpp->rp_prefix.sin6_family = AF_INET6;
        bit_copy((char *)RP_IN6(rpp), sizeof(*RP_IN6(rpp)) << 3,
                 (char *)&irr->irr_useprefix.sin6_addr,
                 sizeof(irr->irr_useprefix.sin6_addr) << 3,
                 0, irr->irr_u_uselen);
        /* copy keeplen part if necessary as necessary len */
        if (irr->irr_u_uselen < ifpr->ifpr_plen)
                bit_copy((char *)RP_IN6(rpp), sizeof(*RP_IN6(rpp)) << 3,
                         (char *)IFPR_IN6(ifpr), sizeof(*IFPR_IN6(ifpr)) << 3,
                         irr->irr_u_uselen,
                         min(ifpr->ifpr_plen - irr->irr_u_uselen,
                             irr->irr_u_keeplen));
        LIST_FOREACH(orap, &(ifpr2rp(ifpr)->rp_addrhead), ra_entry)
        {
                struct rp_addr *rap;
                int error = 0;

                if ((error = create_ra_entry(&rap)) != 0)
                        return error;
                rap->ra_ifid = orap->ra_ifid;
                rap->ra_flags.anycast = (orap->ra_addr != NULL &&
                                         (orap->ra_addr->ia6_flags &
                                          IN6_IFF_ANYCAST) != 0) ? 1 : 0;
                LIST_INSERT_HEAD(&rpp->rp_addrhead, rap, ra_entry);
        }
        rpp->rp_vltime = irr->irr_vltime;
        rpp->rp_pltime = irr->irr_pltime;
        rpp->rp_raf_onlink = irr->irr_raf_mask_onlink ? irr->irr_raf_onlink :
                ifpr2rp(ifpr)->rp_raf_onlink;
        rpp->rp_raf_auto = irr->irr_raf_mask_auto ? irr->irr_raf_auto :
                ifpr2rp(ifpr)->rp_raf_auto;
        /* Is some FlagMasks for rrf necessary? */
        rpp->rp_rrf = irr->irr_rrf;
        rpp->rp_origin = irr->irr_origin;

        return 0;
}

static void
free_rp_entries(struct rr_prefix *rpp)
{
        /*
         * This func is only called with rpp on stack(not on list).
         * So no crit_enter() here
         */
        while (!LIST_EMPTY(&rpp->rp_addrhead))
        {
                struct rp_addr *rap;

                rap = LIST_FIRST(&rpp->rp_addrhead);
                LIST_REMOVE(rap, ra_entry);
                if (rap->ra_addr) {
                        crit_enter();   /* XXX MP not MP safe */
                        _IFAFREE(&rap->ra_addr->ia_ifa, 0);
                        crit_exit();
                }
                kfree(rap, M_RR_ADDR);
        }
}

static int
add_useprefixes(struct socket *so, struct ifnet *ifp,
                struct in6_rrenumreq *irr)
{
        struct ifprefix *ifpr, *nextifpr;
        struct rr_prefix rp;
        int error = 0;

        /* add prefixes to each of marked prefix */
        for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr; ifpr = nextifpr)
        {
                nextifpr = TAILQ_NEXT(ifpr, ifpr_list);
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                if (ifpr2rp(ifpr)->rp_statef_addmark) {
                        if ((error = init_newprefix(irr, ifpr, &rp)) != 0)
                                break;
                        error = add_each_prefix(so, &rp);
                }
        }
        /* free each rp_addr entry */
        free_rp_entries(&rp);

        return error;
}

static void
unprefer_prefix(struct rr_prefix *rpp)
{
        struct rp_addr *rap;

        for (rap = rpp->rp_addrhead.lh_first; rap != NULL;
             rap = rap->ra_entry.le_next) {
                if (rap->ra_addr == NULL)
                        continue;
                rap->ra_addr->ia6_lifetime.ia6t_preferred = time_second;
                rap->ra_addr->ia6_lifetime.ia6t_pltime = 0;
        }
}

int
delete_each_prefix(struct rr_prefix *rpp, u_char origin)
{
        int error = 0;

        if (rpp->rp_origin > origin)
                return (EPERM);

        while (rpp->rp_addrhead.lh_first != NULL) {
                struct rp_addr *rap;

                crit_enter();
                rap = LIST_FIRST(&rpp->rp_addrhead);
                if (rap == NULL) {
                        crit_exit();
                        break;
                }
                LIST_REMOVE(rap, ra_entry);
                crit_exit();
                if (rap->ra_addr == NULL) {
                        kfree(rap, M_RR_ADDR);
                        continue;
                }
                rap->ra_addr->ia6_ifpr = NULL;

                in6_purgeaddr(&rap->ra_addr->ia_ifa);
                crit_enter();   /* XXX MP not MP safe */
                _IFAFREE(&rap->ra_addr->ia_ifa, 0);
                crit_exit();
                kfree(rap, M_RR_ADDR);
        }
        rp_remove(rpp);

        return error;
}

static void
delete_prefixes(struct ifnet *ifp, u_char origin)
{
        struct ifprefix *ifpr, *nextifpr;

        /* delete prefixes marked as tobe deleted */
        for (ifpr = TAILQ_FIRST(&ifp->if_prefixhead); ifpr; ifpr = nextifpr)
        {
                nextifpr = TAILQ_NEXT(ifpr, ifpr_list);
                if (ifpr->ifpr_prefix->sa_family != AF_INET6 ||
                    ifpr->ifpr_type != IN6_PREFIX_RR)
                        continue;
                if (ifpr2rp(ifpr)->rp_statef_delmark)
                        delete_each_prefix(ifpr2rp(ifpr), origin);
        }
}

static int
link_stray_ia6s(struct rr_prefix *rpp)
{
        struct ifaddr_container *ifac;

        TAILQ_FOREACH(ifac, &rpp->rp_ifp->if_addrheads[mycpuid], ifa_link) {
                struct ifaddr *ifa = ifac->ifa;
                struct rp_addr *rap;
                struct rr_prefix *orpp;
                int error = 0;

                if (ifa->ifa_addr->sa_family != AF_INET6)
                        continue;
                if (rpp->rp_plen > in6_matchlen(RP_IN6(rpp), IFA_IN6(ifa)))
                        continue;

                orpp = ifpr2rp(((struct in6_ifaddr *)ifa)->ia6_ifpr);
                if (orpp != NULL) {
                        if (!in6_are_prefix_equal(RP_IN6(orpp), RP_IN6(rpp),
                                                  rpp->rp_plen))
                                log(LOG_ERR, "in6_prefix.c: link_stray_ia6s:"
                                    "addr %s/%d already linked to a prefix"
                                    "and it matches also %s/%d\n",
                                    ip6_sprintf(IFA_IN6(ifa)), orpp->rp_plen,
                                    ip6_sprintf(RP_IN6(rpp)),
                                    rpp->rp_plen);
                        continue;
                }
                if ((error = assign_ra_entry(rpp,
                                              (sizeof(rap->ra_ifid) << 3) -
                                              rpp->rp_plen,
                                              (struct in6_ifaddr *)ifa)) != 0)
                        return error;
        }
        return 0;
}

/* XXX assumes that permission is already checked by the caller */
int
in6_prefix_ioctl(struct socket *so, u_long cmd, caddr_t data,
                 struct ifnet *ifp)
{
        struct ifaddr_container *ifac;
        struct rr_prefix *rpp, rp_tmp;
        struct rp_addr *rap;
        struct in6_prefixreq *ipr = (struct in6_prefixreq *)data;
        struct in6_rrenumreq *irr = (struct in6_rrenumreq *)data;
        int error = 0;

        /*
         * Failsafe for errneous address config program.
         * Let's hope rrenumd don't make a mistakes.
         */
        if (ipr->ipr_origin <= PR_ORIG_RA)
                ipr->ipr_origin = PR_ORIG_STATIC;

        switch (cmd) {
        case SIOCSGIFPREFIX_IN6:
                delmark_global_prefixes(ifp, irr);
                /* FALL THROUGH */
        case SIOCAIFPREFIX_IN6:
        case SIOCCIFPREFIX_IN6:
                /* check if preferred lifetime > valid lifetime */
                if (irr->irr_pltime > irr->irr_vltime) {
                        log(LOG_NOTICE,
                            "in6_prefix_ioctl: preferred lifetime"
                            "(%ld) is greater than valid lifetime(%ld)\n",
                            (u_long)irr->irr_pltime, (u_long)irr->irr_vltime);
                        error = EINVAL;
                        break;
                }
                if (mark_matched_prefixes(cmd, ifp, irr)) {
                        if (irr->irr_u_uselen != 0)
                                if ((error = add_useprefixes(so, ifp, irr))
                                    != 0)
                                        goto failed;
                        if (cmd != SIOCAIFPREFIX_IN6)
                                delete_prefixes(ifp, irr->irr_origin);
                } else
                        return (EADDRNOTAVAIL);
        failed:
                unmark_prefixes(ifp);
                break;
        case SIOCGIFPREFIX_IN6:
                rpp = search_matched_prefix(ifp, ipr);
                if (rpp == NULL || ifp != rpp->rp_ifp)
                        return (EADDRNOTAVAIL);

                ipr->ipr_origin = rpp->rp_origin;
                ipr->ipr_plen = rpp->rp_plen;
                ipr->ipr_vltime = rpp->rp_vltime;
                ipr->ipr_pltime = rpp->rp_pltime;
                ipr->ipr_flags = rpp->rp_flags;
                ipr->ipr_prefix = rpp->rp_prefix;

                break;
        case SIOCSIFPREFIX_IN6:
                /* check if preferred lifetime > valid lifetime */
                if (ipr->ipr_pltime > ipr->ipr_vltime) {
                        log(LOG_NOTICE,
                            "in6_prefix_ioctl: preferred lifetime"
                            "(%ld) is greater than valid lifetime(%ld)\n",
                            (u_long)ipr->ipr_pltime, (u_long)ipr->ipr_vltime);
                        error = EINVAL;
                        break;
                }

                /* init rp_tmp */
                bzero((caddr_t)&rp_tmp, sizeof(rp_tmp));
                rp_tmp.rp_ifp = ifp;
                rp_tmp.rp_plen = ipr->ipr_plen;
                rp_tmp.rp_prefix = ipr->ipr_prefix;
                rp_tmp.rp_vltime = ipr->ipr_vltime;
                rp_tmp.rp_pltime = ipr->ipr_pltime;
                rp_tmp.rp_flags = ipr->ipr_flags;
                rp_tmp.rp_origin = ipr->ipr_origin;

                /* create rp_addr entries, usually at least for lladdr */
                if ((error = link_stray_ia6s(&rp_tmp)) != 0) {
                        free_rp_entries(&rp_tmp);
                        break;
                }
                TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_list) {
                        struct ifaddr *ifa = ifac->ifa;

                        if (ifa->ifa_addr == NULL)
                                continue;       /* just for safety */
                        if (ifa->ifa_addr->sa_family != AF_INET6)
                                continue;
                        if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa)) == 0)
                                continue;

                        if ((error = create_ra_entry(&rap)) != 0) {
                                free_rp_entries(&rp_tmp);
                                goto bad;
                        }
                        /* copy interface id part */
                        bit_copy((caddr_t)&rap->ra_ifid,
                                 sizeof(rap->ra_ifid) << 3,
                                 (caddr_t)IFA_IN6(ifa),
                                 sizeof(*IFA_IN6(ifa)) << 3,
                                 rp_tmp.rp_plen,
                                 (sizeof(rap->ra_ifid) << 3) - rp_tmp.rp_plen);
                        /* insert into list */
                        LIST_INSERT_HEAD(&rp_tmp.rp_addrhead, rap, ra_entry);
                }

                error = add_each_prefix(so, &rp_tmp);

                /* free each rp_addr entry */
                free_rp_entries(&rp_tmp);

                break;
        case SIOCDIFPREFIX_IN6:
                rpp = search_matched_prefix(ifp, ipr);
                if (rpp == NULL || ifp != rpp->rp_ifp)
                        return (EADDRNOTAVAIL);

                error = delete_each_prefix(rpp, ipr->ipr_origin);
                break;
        }
bad:
        return error;
}

void
in6_rr_timer(void *ignored_arg)
{
        struct rr_prefix *rpp;

        callout_reset(&in6_rr_timer_ch, ip6_rr_prune * hz,
            in6_rr_timer, NULL);

        crit_enter();
        /* expire */
        rpp = LIST_FIRST(&rr_prefix);
        while (rpp) {
                if (rpp->rp_expire && rpp->rp_expire < time_second) {
                        struct rr_prefix *next_rpp;

                        next_rpp = LIST_NEXT(rpp, rp_entry);
                        delete_each_prefix(rpp, PR_ORIG_KERNEL);
                        rpp = next_rpp;
                        continue;
                }
                if (rpp->rp_preferred && rpp->rp_preferred < time_second)
                        unprefer_prefix(rpp);
                rpp = LIST_NEXT(rpp, rp_entry);
        }
        crit_exit();
}