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//==========================================================================
//
//      src/sys/netinet6/in6.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: in6.c,v 1.256 2001/12/24 10:39:29 jinmei Exp $   */
 
/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
 
/*
 * 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/errno.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
 
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/if_dl.h>
 
#include <netinet/in.h>
#include <netinet/in_var.h>
#ifdef __NetBSD__
#include <net/if_ether.h>
#else
#include <netinet/if_ether.h>
#endif
#ifndef SCOPEDROUTING
#if defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#endif
#endif
 
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/mld6_var.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/scope6_var.h>
#ifndef SCOPEDROUTING
#if defined(__NetBSD__) || (defined(__bsdi__) && _BSDI_VERSION < 199802) || defined(__FreeBSD__)
#include <netinet6/in6_pcb.h>
#endif
#endif
 
#ifdef MIP6
#include <netinet6/mip6.h>
#endif /* MIP6 */
 
/*
 * Definitions of some costant IP6 addresses.
 */
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
const struct in6_addr in6addr_nodelocal_allnodes =
        IN6ADDR_NODELOCAL_ALLNODES_INIT;
const struct in6_addr in6addr_linklocal_allnodes =
        IN6ADDR_LINKLOCAL_ALLNODES_INIT;
const struct in6_addr in6addr_linklocal_allrouters =
        IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 
const struct in6_addr in6mask0 = IN6MASK0;
const struct in6_addr in6mask32 = IN6MASK32;
const struct in6_addr in6mask64 = IN6MASK64;
const struct in6_addr in6mask96 = IN6MASK96;
const struct in6_addr in6mask128 = IN6MASK128;
 
const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
                                     0, 0, IN6ADDR_ANY_INIT, 0};
 
#if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3)
static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
        struct ifnet *, struct proc *));
#else
static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
        struct ifnet *));
#endif
static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
                           struct sockaddr_in6 *, int));
static void in6_unlink_ifa __P((struct in6_ifaddr *, struct ifnet *));
 
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
struct in6_multihead in6_multihead;     /* XXX BSS initialization */
#else
/*
 * This structure is used to keep track of in6_multi chains which belong to
 * deleted interface addresses.
 */
static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */
 
struct multi6_kludge {
        LIST_ENTRY(multi6_kludge) mk_entry;
        struct ifnet *mk_ifp;
        struct in6_multihead mk_head;
};
#endif
 
#ifdef MEASURE_PERFORMANCE
static void in6h_delifa __P((struct in6_ifaddr *));
static void in6h_addhash __P((struct in6hash *));
static void in6h_delhash __P((struct in6hash *));
#endif
 
/*
 * Subroutine for in6_ifaddloop() and in6_ifremloop().
 * This routine does actual work.
 */
static void
in6_ifloop_request(int cmd, struct ifaddr *ifa)
{
        struct sockaddr_in6 all1_sa;
        struct rtentry *nrt = NULL;
        int e;
 
        bzero(&all1_sa, sizeof(all1_sa));
        all1_sa.sin6_family = AF_INET6;
        all1_sa.sin6_len = sizeof(struct sockaddr_in6);
        all1_sa.sin6_addr = in6mask128;
 
        /*
         * We specify the address itself as the gateway, and set the
         * RTF_LLINFO flag, so that the corresponding host route would have
         * the flag, and thus applications that assume traditional behavior
         * would be happy.  Note that we assume the caller of the function
         * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
         * which changes the outgoing interface to the loopback interface.
         */
        e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr,
                      (struct sockaddr *)&all1_sa,
                      RTF_UP|RTF_HOST|RTF_LLINFO, &nrt);
        if (e != 0) {
                log(LOG_ERR, "in6_ifloop_request: "
                    "%s operation failed for %s (errno=%d)\n",
                    cmd == RTM_ADD ? "ADD" : "DELETE",
                    ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr),
                    e);
        }
 
        /*
         * Make sure rt_ifa be equal to IFA, the second argument of the
         * function.
         * We need this because when we refer to rt_ifa->ia6_flags in
         * ip6_input, we assume that the rt_ifa points to the address instead
         * of the loopback address.
         */
        if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) {
                IFAFREE(nrt->rt_ifa);
                IFAREF(ifa);
                nrt->rt_ifa = ifa;
        }
 
        /*
         * Report the addition/removal of the address to the routing socket.
         * XXX: since we called rtinit for a p2p interface with a destination,
         *      we end up reporting twice in such a case.  Should we rather
         *      omit the second report?
         */
        if (nrt) {
                rt_newaddrmsg(cmd, ifa, e, nrt);
                if (cmd == RTM_DELETE) {
                        if (nrt->rt_refcnt <= 0) {
                                /* XXX: we should free the entry ourselves. */
                                nrt->rt_refcnt++;
                                rtfree(nrt);
                        }
                } else {
                        /* the cmd must be RTM_ADD here */
                        nrt->rt_refcnt--;
                }
        }
}
 
/*
 * Add ownaddr as loopback rtentry.  We previously add the route only if
 * necessary (ex. on a p2p link).  However, since we now manage addresses
 * separately from prefixes, we should always add the route.  We can't
 * rely on the cloning mechanism from the corresponding interface route
 * any more.
 */
static void
in6_ifaddloop(struct ifaddr *ifa)
{
        struct rtentry *rt;
 
        /* If there is no loopback entry, allocate one. */
        rt = rtalloc1(ifa->ifa_addr, 0
#ifdef __FreeBSD__
                      , 0
#endif /* __FreeBSD__ */
                );
        if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
            (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0)
                in6_ifloop_request(RTM_ADD, ifa);
        if (rt)
                rt->rt_refcnt--;
}
 
/*
 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
 * if it exists.
 */
static void
in6_ifremloop(struct ifaddr *ifa)
{
        struct in6_ifaddr *ia;
        struct rtentry *rt;
        int ia_count = 0;
 
        /*
         * Some of BSD variants do not remove cloned routes
         * from an interface direct route, when removing the direct route
         * (see comments in net/net_osdep.h).  Even for variants that do remove
         * cloned routes, they could fail to remove the cloned routes when
         * we handle multple addresses that share a common prefix.
         * So, we should remove the route corresponding to the deleted address
         * regardless of the result of in6_is_ifloop_auto().
         */
 
        /*
         * Delete the entry only if exact one ifa exists.  More than one ifa
         * can exist if we assign a same single address to multiple
         * (probably p2p) interfaces.
         * XXX: we should avoid such a configuration in IPv6...
         */
        for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
                        ia_count++;
                        if (ia_count > 1)
                                break;
                }
        }
 
        if (ia_count == 1) {
                /*
                 * Before deleting, check if a corresponding loopbacked host
                 * route surely exists.  With this check, we can avoid to
                 * delete an interface direct route whose destination is same
                 * as the address being removed.  This can happen when remofing
                 * a subnet-router anycast address on an interface attahced
                 * to a shared medium.
                 */
                rt = rtalloc1(ifa->ifa_addr, 0
#ifdef __FreeBSD__
                              , 0
#endif /* __FreeBSD__ */
                        );
                if (rt != NULL && (rt->rt_flags & RTF_HOST) != 0 &&
                    (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
                        rt->rt_refcnt--;
                        in6_ifloop_request(RTM_DELETE, ifa);
                }
        }
}
 
int
in6_ifindex2scopeid(idx)
        int idx;
{
        struct ifnet *ifp;
        struct ifaddr *ifa;
        struct sockaddr_in6 *sin6;
 
        if (idx < 0 || if_index < idx)
                return -1;
#if defined(__FreeBSD__) && __FreeBSD__ >= 5
        ifp = ifnet_byindex(idx);
#else
        ifp = ifindex2ifnet[idx];
#endif
        if (!ifp)
                return -1;
 
#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)
                        continue;
                sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
                if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
                        return sin6->sin6_scope_id & 0xffff;
        }
 
        return -1;
}
 
int
in6_mask2len(mask, lim0)
        struct in6_addr *mask;
        u_char *lim0;
{
        int x = 0, y;
        u_char *lim = lim0, *p;
 
        if (lim0 == NULL ||
            lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */
                lim = (u_char *)mask + sizeof(*mask);
        for (p = (u_char *)mask; p < lim; x++, p++) {
                if (*p != 0xff)
                        break;
        }
        y = 0;
        if (p < lim) {
                for (y = 0; y < 8; y++) {
                        if ((*p & (0x80 >> y)) == 0)
                                break;
                }
        }
 
        /*
         * when the limit pointer is given, do a stricter check on the
         * remaining bits.
         */
        if (p < lim) {
                if (y != 0 && (*p & (0x00ff >> y)) != 0)
                        return(-1);
                for (p = p + 1; p < lim; p++)
                        if (*p != 0)
                                return(-1);
        }
 
        return x * 8 + y;
}
 
#define ifa2ia6(ifa)    ((struct in6_ifaddr *)(ifa))
#define ia62ifa(ia6)    (&((ia6)->ia_ifa))
 
int
#if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3)
in6_control(so, cmd, data, ifp, p)
        struct  socket *so;
        u_long cmd;
        caddr_t data;
        struct ifnet *ifp;
        struct proc *p;
#else
in6_control(so, cmd, data, ifp)
        struct  socket *so;
        u_long cmd;
        caddr_t data;
        struct ifnet *ifp;
#endif
{
        struct  in6_ifreq *ifr = (struct in6_ifreq *)data;
        struct  in6_ifaddr *ia = NULL;
        struct  in6_aliasreq *ifra = (struct in6_aliasreq *)data;
        struct sockaddr_in6 *sa6;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
        time_t time_second = (time_t)time.tv_sec;
#endif
 
        switch (cmd) {
        case SIOCGETSGCNT_IN6:
        case SIOCGETMIFCNT_IN6:
                return (mrt6_ioctl(cmd, data));
        }
 
        switch(cmd) {
        case SIOCAADDRCTL_POLICY:
        case SIOCDADDRCTL_POLICY:
                return(in6_src_ioctl(cmd, data));
        }
 
#ifdef MIP6
        switch (cmd) {
        case SIOCENABLEMN:
        case SIOCENABLEHA:
                return(mip6_ioctl(cmd, data));
        case SIOCGBC:
                return(mip6_ioctl(cmd, data));
        }
#endif /* MIP6 */
 
        if (ifp == NULL)
                return(EOPNOTSUPP);
 
        switch (cmd) {
        case SIOCSNDFLUSH_IN6:
        case SIOCSPFXFLUSH_IN6:
        case SIOCSRTRFLUSH_IN6:
        case SIOCSDEFIFACE_IN6:
        case SIOCSIFINFO_FLAGS:
                /* fall through */
        case OSIOCGIFINFO_IN6:
        case SIOCGIFINFO_IN6:
        case SIOCGDRLST_IN6:
        case SIOCGPRLST_IN6:
        case SIOCGNBRINFO_IN6:
        case SIOCGDEFIFACE_IN6:
                return(nd6_ioctl(cmd, data, ifp));
        }
 
        switch (cmd) {
        case SIOCSIFPREFIX_IN6:
        case SIOCDIFPREFIX_IN6:
        case SIOCAIFPREFIX_IN6:
        case SIOCCIFPREFIX_IN6:
        case SIOCSGIFPREFIX_IN6:
        case SIOCGIFPREFIX_IN6:
                log(LOG_NOTICE,
                    "prefix ioctls are now invalidated. "
                    "please use ifconfig.\n");
                return(EOPNOTSUPP);
        }
 
        switch (cmd) {
        case SIOCSSCOPE6:
                return(scope6_set(ifp, ifr->ifr_ifru.ifru_scope_id));
        case SIOCGSCOPE6:
                return(scope6_get(ifp, ifr->ifr_ifru.ifru_scope_id));
        case SIOCGSCOPE6DEF:
                return(scope6_get_default(ifr->ifr_ifru.ifru_scope_id));
        }
 
        switch (cmd) {
        case SIOCALIFADDR:
        case SIOCDLIFADDR:
                /* fall through */
        case SIOCGLIFADDR:
#if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3)
                return in6_lifaddr_ioctl(so, cmd, data, ifp, p);
#else
                return in6_lifaddr_ioctl(so, cmd, data, ifp);
#endif
        }
 
        /*
         * Find address for this interface, if it exists.
         *
         * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
         * only, and used the first interface address as the target of other
         * operations (without checking ifra_addr).  This was because netinet
         * code/API assumed at most 1 interface address per interface.
         * Since IPv6 allows a node to assign multiple addresses
         * on a single interface, we almost always look and check the
         * presence of ifra_addr, and reject invalid ones here.
         * It also decreases duplicated code among SIOC*_IN6 operations.
         */
        switch (cmd) {
        case SIOCAIFADDR_IN6:
        case SIOCSIFPHYADDR_IN6:
                sa6 = &ifra->ifra_addr;
                break;
        case SIOCSIFADDR_IN6:
        case SIOCGIFADDR_IN6:
        case SIOCSIFDSTADDR_IN6:
        case SIOCSIFNETMASK_IN6:
        case SIOCGIFDSTADDR_IN6:
        case SIOCGIFNETMASK_IN6:
        case SIOCDIFADDR_IN6:
        case SIOCGIFPSRCADDR_IN6:
        case SIOCGIFPDSTADDR_IN6:
        case SIOCGIFAFLAG_IN6:
        case SIOCSNDFLUSH_IN6:
        case SIOCSPFXFLUSH_IN6:
        case SIOCSRTRFLUSH_IN6:
        case SIOCGIFALIFETIME_IN6:
        case SIOCSIFALIFETIME_IN6:
        case SIOCGIFSTAT_IN6:
        case SIOCGIFSTAT_ICMP6:
                sa6 = &ifr->ifr_addr;
                break;
        default:
                sa6 = NULL;
                break;
        }
        if (sa6 && sa6->sin6_family == AF_INET6) {
                if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
                        if (sa6->sin6_addr.s6_addr16[1] == 0) {
                                /* link ID is not embedded by the user */
                                sa6->sin6_addr.s6_addr16[1] =
                                        htons(ifp->if_index);
                        } else if (sa6->sin6_addr.s6_addr16[1] !=
                                    htons(ifp->if_index)) {
                                return(EINVAL); /* link ID contradicts */
                        }
                        if (sa6->sin6_scope_id) {
                                if (sa6->sin6_scope_id !=
                                    (u_int32_t)ifp->if_index)
                                        return(EINVAL);
                                sa6->sin6_scope_id = 0; /* XXX: good way? */
                        }
                }
                ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
        } else
                ia = NULL;
 
        switch (cmd) {
        case SIOCSIFADDR_IN6:
        case SIOCSIFDSTADDR_IN6:
        case SIOCSIFNETMASK_IN6:
                /*
                 * Since IPv6 allows a node to assign multiple addresses
                 * on a single interface, SIOCSIFxxx ioctls are deprecated.
                 */
                return(EINVAL);
 
        case SIOCDIFADDR_IN6:
                /*
                 * for IPv4, we look for existing in_ifaddr here to allow
                 * "ifconfig if0 delete" to remove the first IPv4 address on
                 * the interface.  For IPv6, as the spec allows multiple
                 * interface address from the day one, we consider "remove the
                 * first one" semantics to be not preferable.
                 */
                if (ia == NULL)
                        return(EADDRNOTAVAIL);
                /* FALLTHROUGH */
        case SIOCAIFADDR_IN6:
                /*
                 * We always require users to specify a valid IPv6 address for
                 * the corresponding operation.
                 */
                if (ifra->ifra_addr.sin6_family != AF_INET6 ||
                    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
                        return(EAFNOSUPPORT);
 
                break;
 
        case SIOCGIFADDR_IN6:
                /* This interface is basically deprecated. use SIOCGIFCONF. */
                /* fall through */
        case SIOCGIFAFLAG_IN6:
        case SIOCGIFNETMASK_IN6:
        case SIOCGIFDSTADDR_IN6:
        case SIOCGIFALIFETIME_IN6:
                /* must think again about its semantics */
                if (ia == NULL)
                        return(EADDRNOTAVAIL);
                break;
        case SIOCSIFALIFETIME_IN6:
            {
                struct in6_addrlifetime *lt;
 
                if (ia == NULL)
                        return(EADDRNOTAVAIL);
                /* sanity for overflow - beware unsigned */
                lt = &ifr->ifr_ifru.ifru_lifetime;
                if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
                 && lt->ia6t_vltime + time_second < time_second) {
                        return EINVAL;
                }
                if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
                 && lt->ia6t_pltime + time_second < time_second) {
                        return EINVAL;
                }
                break;
            }
        }
 
        switch (cmd) {
 
        case SIOCGIFADDR_IN6:
                ifr->ifr_addr = ia->ia_addr;
                break;
 
        case SIOCGIFDSTADDR_IN6:
                if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
                        return(EINVAL);
                /*
                 * XXX: should we check if ifa_dstaddr is NULL and return
                 * an error?
                 */
                ifr->ifr_dstaddr = ia->ia_dstaddr;
                break;
 
        case SIOCGIFNETMASK_IN6:
                ifr->ifr_addr = ia->ia_prefixmask;
                break;
 
        case SIOCGIFAFLAG_IN6:
                ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
                break;
 
        case SIOCGIFSTAT_IN6:
                if (ifp == NULL)
                        return EINVAL;
                if (in6_ifstat == NULL || ifp->if_index >= in6_ifstatmax
                 || in6_ifstat[ifp->if_index] == NULL) {
                        /* return EAFNOSUPPORT? */
                        bzero(&ifr->ifr_ifru.ifru_stat,
                                sizeof(ifr->ifr_ifru.ifru_stat));
                } else
                        ifr->ifr_ifru.ifru_stat = *in6_ifstat[ifp->if_index];
                break;
 
        case SIOCGIFSTAT_ICMP6:
                if (ifp == NULL)
                        return EINVAL;
                if (icmp6_ifstat == NULL || ifp->if_index >= icmp6_ifstatmax ||
                    icmp6_ifstat[ifp->if_index] == NULL) {
                        /* return EAFNOSUPPORT? */
                        bzero(&ifr->ifr_ifru.ifru_stat,
                                sizeof(ifr->ifr_ifru.ifru_icmp6stat));
                } else
                        ifr->ifr_ifru.ifru_icmp6stat =
                                *icmp6_ifstat[ifp->if_index];
                break;
 
        case SIOCGIFALIFETIME_IN6:
                ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
                if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
                        time_t maxexpire;
                        struct in6_addrlifetime *retlt = &ifr->ifr_ifru.ifru_lifetime;
 
                        /*
                         * XXX: adjust expiration time assuming time_t is
                         * signed.
                         */
                        maxexpire = (-1) &
                                ~(1 << ((sizeof(maxexpire) * 8) - 1));
                        if (ia->ia6_lifetime.ia6t_vltime <
                            maxexpire - ia->ia6_updatetime) {
                                retlt->ia6t_expire = ia->ia6_updatetime +
                                        ia->ia6_lifetime.ia6t_vltime;
                        } else
                                retlt->ia6t_expire = maxexpire;
                }
                if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
                        time_t maxexpire;
                        struct in6_addrlifetime *retlt = &ifr->ifr_ifru.ifru_lifetime;
 
                        /*
                         * XXX: adjust expiration time assuming time_t is
                         * signed.
                         */
                        maxexpire = (-1) &
                                ~(1 << ((sizeof(maxexpire) * 8) - 1));
                        if (ia->ia6_lifetime.ia6t_pltime <
                            maxexpire - ia->ia6_updatetime) {
                                retlt->ia6t_preferred = ia->ia6_updatetime +
                                        ia->ia6_lifetime.ia6t_pltime;
                        } else
                                retlt->ia6t_preferred = maxexpire;
                }
                break;
 
        case SIOCSIFALIFETIME_IN6:
                ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
                /* for sanity */
                if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
                        ia->ia6_lifetime.ia6t_expire =
                                time_second + ia->ia6_lifetime.ia6t_vltime;
                } else
                        ia->ia6_lifetime.ia6t_expire = 0;
                if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
                        ia->ia6_lifetime.ia6t_preferred =
                                time_second + ia->ia6_lifetime.ia6t_pltime;
                } else
                        ia->ia6_lifetime.ia6t_preferred = 0;
                break;
 
        case SIOCAIFADDR_IN6:
        {
                int i, error = 0;
                struct nd_prefix pr0, *pr;
 
                /*
                 * first, make or update the interface address structure,
                 * and link it to the list.
                 */
                if ((error = in6_update_ifa(ifp, ifra, ia)) != 0)
                        return(error);
                if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
                    == NULL) {
                        /*
                         * this can happen when the user specify the 0 valid
                         * lifetime.
                         */
                        break;
                }
 
                /*
                 * then, make the prefix on-link on the interface.
                 * XXX: we'd rather create the prefix before the address, but
                 * we need at least one address to install the corresponding
                 * interface route, so we configure the address first.
                 */
 
                /*
                 * convert mask to prefix length (prefixmask has already
                 * been validated in in6_update_ifa().
                 */
                bzero(&pr0, sizeof(pr0));
                pr0.ndpr_ifp = ifp;
                pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
                                             NULL);
                if (pr0.ndpr_plen == 128)
                        break;  /* we don't need to install a host route. */
                pr0.ndpr_prefix = ifra->ifra_addr;
                pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
                /* apply the mask for safety. */
                for (i = 0; i < 4; i++) {
                        pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
                                ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
                }
                /*
                 * XXX: since we don't have an API to set prefix (not address)
                 * lifetimes, we just use the same lifetimes as addresses.
                 * The (temporarily) installed lifetimes can be overridden by
                 * later advertised RAs (when accept_rtadv is non 0), which is
                 * an intended behavior.
                 */
                pr0.ndpr_raf_onlink = 1; /* should be configurable? */
                pr0.ndpr_raf_auto =
                        ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
                pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
                pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
 
                /* add the prefix if there's one. */
                if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
                        /*
                         * nd6_prelist_add will install the corresponding
                         * interface route.
                         */
                        if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
                                return(error);
                        if (pr == NULL) {
                                log(LOG_ERR, "nd6_prelist_add succeeded but "
                                    "no prefix\n");
                                return(EINVAL); /* XXX panic here? */
                        }
                }
                if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
                    ia->ia6_ndpr == NULL) { /* new autoconfed addr */
                        ia->ia6_ndpr = pr;
                        pr->ndpr_refcnt++;
 
                        /*
                         * If this is the first autoconf address from
                         * the prefix, create a temporary address
                         * as well (when specified).
                         */
                        if (ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
                                int e;
                                if ((e = in6_tmpifadd(ia, 1)) != 0) {
                                        log(LOG_NOTICE, "in6_control: failed "
                                            "to create a temporary address, "
                                            "errno=%d\n",
                                            e);
                                }
                        }
                }
 
                /*
                 * this might affect the status of autoconfigured addresses,
                 * that is, this address might make other addresses detached.
                 */
                pfxlist_onlink_check();
 
                break;
        }
 
        case SIOCDIFADDR_IN6:
        {
                int i = 0, purgeprefix = 0;
                struct nd_prefix pr0, *pr = NULL;
 
                /*
                 * If the address being deleted is the only one that owns
                 * the corresponding prefix, expire the prefix as well.
                 * XXX: theoretically, we don't have to worry about such
                 * relationship, since we separate the address management
                 * and the prefix management.  We do this, however, to provide
                 * as much backward compatibility as possible in terms of
                 * the ioctl operation.
                 */
                bzero(&pr0, sizeof(pr0));
                pr0.ndpr_ifp = ifp;
                pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr,
                                             NULL);
                if (pr0.ndpr_plen == 128)
                        goto purgeaddr;
                pr0.ndpr_prefix = ia->ia_addr;
                pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr;
                for (i = 0; i < 4; i++) {
                        pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
                                ia->ia_prefixmask.sin6_addr.s6_addr32[i];
                }
                /*
                 * The logic of the following condition is a bit complicated.
                 * We expire the prefix when
                 * 1. the address obeys autoconfiguration and it is the
                 *    only owner of the associated prefix, or
                 * 2. the address does not obey autoconf and there is no
                 *    other owner of the prefix.
                 */
                if ((pr = nd6_prefix_lookup(&pr0)) != NULL &&
                    (((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 &&
                      pr->ndpr_refcnt == 1) ||
                     ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0 &&
                      pr->ndpr_refcnt == 0)))
                        purgeprefix = 1;
 
          purgeaddr:
                in6_purgeaddr(&ia->ia_ifa);
                if (pr && purgeprefix)
                        prelist_remove(pr);
                break;
        }
 
        default:
                if (ifp == NULL || ifp->if_ioctl == 0)
                        return(EOPNOTSUPP);
                return((*ifp->if_ioctl)(ifp, cmd, data));
        }
 
        return(0);
}
 
/*
 * Update parameters of an IPv6 interface address.
 * If necessary, a new entry is created and linked into address chains.
 * This function is separated from in6_control().
 * XXX: should this be performed under splnet()?
 */
static int
_in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
                struct in6_ifaddr *ia)
{
        int error = 0, hostIsNew = 0, plen = -1;
        struct in6_ifaddr *oia;
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
        struct ifaddr *ifa;
#endif
        struct sockaddr_in6 dst6;
        struct in6_addrlifetime *lt;
        struct in6_multi_mship *imm;
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
        time_t time_second = (time_t)time.tv_sec;
#endif
#ifdef MEASURE_PERFORMANCE
        int new_ifa = 0;
#endif
        struct rtentry *rt;
 
        /* Validate parameters */
        if (ifp == NULL || ifra == NULL) /* this maybe redundant */
                return(EINVAL);
 
        /*
         * The destination address for a p2p link must have a family
         * of AF_UNSPEC or AF_INET6.
         */
        if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
            ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
            ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
                return(EAFNOSUPPORT);
        /*
         * validate ifra_prefixmask.  don't check sin6_family, netmask
         * does not carry fields other than sin6_len.
         */
        if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
                return(EINVAL);
        /*
         * Because the IPv6 address architecture is classless, we require
         * users to specify a (non 0) prefix length (mask) for a new address.
         * We also require the prefix (when specified) mask is valid, and thus
         * reject a non-consecutive mask.
         */
        if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
                return(EINVAL);
        if (ifra->ifra_prefixmask.sin6_len != 0) {
                plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
                                    (u_char *)&ifra->ifra_prefixmask +
                                    ifra->ifra_prefixmask.sin6_len);
                if (plen <= 0)
                        return(EINVAL);
        }
        else {
                /*
                 * In this case, ia must not be NULL.  We just use its prefix
                 * length.
                 */
                plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
        }
        /*
         * If the destination address on a p2p interface is specified,
         * and the address is a scoped one, validate/set the scope
         * zone identifier.
         */
        dst6 = ifra->ifra_dstaddr;
        if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) &&
            (dst6.sin6_family == AF_INET6)) {
                int64_t zoneid;
 
#ifndef SCOPEDROUTING
                if ((error = in6_recoverscope(&dst6,
                                              &ifra->ifra_dstaddr.sin6_addr,
                                              ifp)) != 0)
                        return(error);
#endif
                if ((zoneid = in6_addr2zoneid(ifp, &dst6.sin6_addr)) < 0)
                        return(EINVAL);
                if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */
                        dst6.sin6_scope_id = zoneid;
                else if (dst6.sin6_scope_id != zoneid)
                        return(EINVAL); /* scope ID mismatch. */
                if ((error = in6_embedscope(&dst6.sin6_addr, &dst6)) != 0)
                        return(error);
#ifndef SCOPEDROUTING
                dst6.sin6_scope_id = 0; /* XXX */
#endif
        }
        /*
         * The destination address can be specified only for a p2p or a
         * loopback interface.  If specified, the corresponding prefix length
         * must be 128.
         */
        if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
#ifdef FORCE_P2PPLEN
                int i;
#endif
 
                if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
                        /* XXX: noisy message */
                        log(LOG_INFO, "in6_update_ifa: a destination can be "
                            "specified for a p2p or a loopback IF only\n");
                        return(EINVAL);
                }
                if (plen != 128) {
                        log(LOG_INFO, "in6_update_ifa: prefixlen should be "
                            "128 when dstaddr is specified\n");
#ifdef FORCE_P2PPLEN
                        /*
                         * To be compatible with old configurations,
                         * such as ifconfig gif0 inet6 2001::1 2001::2
                         * prefixlen 126, we override the specified
                         * prefixmask as if the prefix length was 128.
                         */
                        ifra->ifra_prefixmask.sin6_len
                                = sizeof(struct sockaddr_in6);
                        for (i = 0; i < 4; i++)
                                ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] =
                                        0xffffffff;
                        plen = 128;
#else
                        return(EINVAL);
#endif
                }
        }
        /* lifetime consistency check */
        lt = &ifra->ifra_lifetime;
        if (lt->ia6t_pltime > lt->ia6t_vltime)
                return(EINVAL);
        if (lt->ia6t_vltime == 0) {
                /*
                 * the following log might be noisy, but this is a typical
                 * configuration mistake or a tool's bug.
                 */
                log(LOG_INFO,
                    "in6_update_ifa: valid lifetime is 0 for %s\n",
                    ip6_sprintf(&ifra->ifra_addr.sin6_addr));
 
                if (ia == NULL)
                        return(0); /* there's nothing to do */
        }
 
        /*
         * If this is a new address, allocate a new ifaddr and link it
         * into chains.
         */
        if (ia == NULL) {
                hostIsNew = 1;
                /*
                 * When in6_update_ifa() is called in a process of a received
                 * RA, it is called under an interrupt context.  So, we should
                 * call malloc with M_NOWAIT.
                 */
                ia = (struct in6_ifaddr *)
                        malloc(sizeof(*ia), M_IFADDR, M_NOWAIT);
                if (ia == NULL)
                        return (ENOBUFS);
                bzero((caddr_t)ia, sizeof(*ia));
                LIST_INIT(&ia->ia6_memberships);
                /* Initialize the address and masks, and put time stamp */
                ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
                ia->ia_addr.sin6_family = AF_INET6;
                ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
                ia->ia6_createtime = ia->ia6_updatetime = time_second;
                if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
                        /*
                         * XXX: some functions expect that ifa_dstaddr is not
                         * NULL for p2p interfaces.
                         */
                        ia->ia_ifa.ifa_dstaddr
                                = (struct sockaddr *)&ia->ia_dstaddr;
                } else {
                        ia->ia_ifa.ifa_dstaddr = NULL;
                }
                ia->ia_ifa.ifa_netmask
                        = (struct sockaddr *)&ia->ia_prefixmask;
 
                ia->ia_ifp = ifp;
                if ((oia = in6_ifaddr) != NULL) {
                        for ( ; oia->ia_next; oia = oia->ia_next)
                                continue;
                        oia->ia_next = ia;
                } else
                        in6_ifaddr = ia;
#ifdef __NetBSD__
                /* gain a refcnt for the link from in6_ifaddr */
                IFAREF(&ia->ia_ifa);
#endif
 
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
                if ((ifa = ifp->if_addrlist) != NULL) {
                        for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
                                continue;
                        ifa->ifa_next = ia62ifa(ia);
                } else
                        ifp->if_addrlist = ia62ifa(ia);
#else
                TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa,
                                  ifa_list);
                log_(LOG_ADDR) {
                    diag_printf("%s.%d - After inserting %p into list %p\n",
                                __FUNCTION__, __LINE__,
                                &ia->ia_ifa, &ifp->if_addrlist);
                    _show_ifp(ifp);
                }
#endif
#ifdef __NetBSD__
                /* gain another refcnt for the link from if_addrlist */
                IFAREF(&ia->ia_ifa);
#endif
 
#ifdef MEASURE_PERFORMANCE
                new_ifa = 1;
#endif
        }
 
        /* set prefix mask */
        if (ifra->ifra_prefixmask.sin6_len) {
                /*
                 * We prohibit changing the prefix length of an existing
                 * address, because
                 * + such an operation should be rare in IPv6, and
                 * + the operation would confuse prefix management.
                 */
                if (ia->ia_prefixmask.sin6_len &&
                    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
                        log(LOG_INFO, "in6_update_ifa: the prefix length of an"
                            " existing (%s) address should not be changed\n",
                            ip6_sprintf(&ia->ia_addr.sin6_addr));
                        error = EINVAL;
                        goto unlink;
                }
                ia->ia_prefixmask = ifra->ifra_prefixmask;
        }
 
        /*
         * If a new destination address is specified, scrub the old one and
         * install the new destination.  Note that the interface must be
         * p2p or loopback (see the check above.)
         */
        if (dst6.sin6_family == AF_INET6 &&
            !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr,
                                &ia->ia_dstaddr.sin6_addr)) {
                int e;
 
                if ((ia->ia_flags & IFA_ROUTE) != 0 &&
                    (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
                    != 0) {
                        log(LOG_ERR, "in6_update_ifa: failed to remove "
                            "a route to the old destination: %s\n",
                            ip6_sprintf(&ia->ia_addr.sin6_addr));
                        /* proceed anyway... */
                }
                else
                        ia->ia_flags &= ~IFA_ROUTE;
                ia->ia_dstaddr = dst6;
        }
 
        /*
         * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
         * to see if the address is deprecated or invalidated, but initialize
         * these members for applications.
         */
        ia->ia6_lifetime = ifra->ifra_lifetime;
        if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
                ia->ia6_lifetime.ia6t_expire =
                        time_second + ia->ia6_lifetime.ia6t_vltime;
        } else
                ia->ia6_lifetime.ia6t_expire = 0;
        if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
                ia->ia6_lifetime.ia6t_preferred =
                        time_second + ia->ia6_lifetime.ia6t_pltime;
        } else
                ia->ia6_lifetime.ia6t_preferred = 0;
 
        /* reset the interface and routing table appropriately. */
        if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
                goto unlink;
 
        /*
         * Make the address tentative before joining multicast addresses,
         * so that corresponding MLD responses would not have a tentative
         * source address.
         */
        ia->ia6_flags = ifra->ifra_flags;
        ia->ia6_flags &= ~IN6_IFF_DUPLICATED;   /* safety */
#ifdef MIP6
        if (hostIsNew && in6if_do_dad(ifp) && mip6_ifa_need_dad(ia))
#else /* MIP6 */
        if (hostIsNew && in6if_do_dad(ifp))
#endif /* MIP6 */
                ia->ia6_flags |= IN6_IFF_TENTATIVE;
 
        /*
         * Beyond this point, we should call in6_purgeaddr upon an error,
         * not just go to unlink.
         */
 
        if ((ifp->if_flags & IFF_MULTICAST) != 0) {
                struct sockaddr_in6 mltaddr, mltmask;
 
                if (hostIsNew) {
                        /*
                         * join solicited multicast addr for new host id
                         */
                        struct in6_addr llsol;
                        bzero(&llsol, sizeof(struct in6_addr));
                        llsol.s6_addr16[0] = htons(0xff02);
                        llsol.s6_addr16[1] = htons(ifp->if_index);
                        llsol.s6_addr32[1] = 0;
                        llsol.s6_addr32[2] = htonl(1);
                        llsol.s6_addr32[3] =
                                ifra->ifra_addr.sin6_addr.s6_addr32[3];
                        llsol.s6_addr8[12] = 0xff;
                        imm = in6_joingroup(ifp, &llsol, &error);
                        if (imm) {
                                LIST_INSERT_HEAD(&ia->ia6_memberships, imm,
                                    i6mm_chain);
                        } else {
                                log(LOG_ERR,
                                    "in6_update_ifa: addmulti failed for "
                                    "%s on %s (errno=%d)\n",
                                    ip6_sprintf(&llsol),
                                    if_name(ifp), error);
                                goto cleanup;
                        }
                }
 
                bzero(&mltmask, sizeof(mltmask));
                mltmask.sin6_len = sizeof(struct sockaddr_in6);
                mltmask.sin6_family = AF_INET6;
                mltmask.sin6_addr = in6mask32;
 
                /*
                 * join link-local all-nodes address
                 */
                bzero(&mltaddr, sizeof(mltaddr));
                mltaddr.sin6_len = sizeof(struct sockaddr_in6);
                mltaddr.sin6_family = AF_INET6;
                mltaddr.sin6_addr = in6addr_linklocal_allnodes;
                mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
 
#ifdef __FreeBSD__
                rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
#else
                rt = rtalloc1((struct sockaddr *)&mltaddr, 0);
#endif
                if (rt) {
                        /* 32bit came from "mltmask" */
                        if (memcmp(&mltaddr.sin6_addr,
                            &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
                            32 / 8)) {
                                RTFREE(rt);
                                rt = NULL;
                        }
                }
                if (!rt) {
#if (defined(__bsdi__) && _BSDI_VERSION >= 199802)
                        struct rt_addrinfo info;
 
                        bzero(&info, sizeof(info));
                        info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr;
                        info.rti_info[RTAX_GATEWAY] =
                                (struct sockaddr *)&ia->ia_addr;
                        info.rti_info[RTAX_NETMASK] =
                                (struct sockaddr *)&mltmask;
                        info.rti_info[RTAX_IFA] =
                                (struct sockaddr *)&ia->ia_addr;
                        /* XXX: we need RTF_CLONING to fake nd6_rtrequest */
                        info.rti_flags = RTF_UP | RTF_CLONING;
                        error = rtrequest1(RTM_ADD, &info, NULL);
#else
                        error = rtrequest(RTM_ADD,
                                          (struct sockaddr *)&mltaddr,
                                          (struct sockaddr *)&ia->ia_addr,
                                          (struct sockaddr *)&mltmask,
                                          RTF_UP | RTF_CLONING,
                                          (struct rtentry **)0);
#endif
                        if (error)
                                goto cleanup;
                } else {
                        RTFREE(rt);
                }
                imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
                if (imm) {
                        LIST_INSERT_HEAD(&ia->ia6_memberships, imm,
                            i6mm_chain);
                } else {
                        log(LOG_WARNING,
                            "in6_update_ifa: addmulti failed for "
                            "%s on %s (errno=%d)\n",
                            ip6_sprintf(&mltaddr.sin6_addr),
                            if_name(ifp), error);
                        goto cleanup;
                }
 
                /*
                 * join node information group address
                 */
#ifdef __FreeBSD__
#define hostnamelen     strlen(hostname)
#endif
                if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
                    == 0) {
                        imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
                        if (imm) {
                                LIST_INSERT_HEAD(&ia->ia6_memberships, imm,
                                    i6mm_chain);
                        } else {
                                log(LOG_WARNING, "in6_update_ifa: "
                                    "addmulti failed for "
                                    "%s on %s (errno=%d)\n",
                                    ip6_sprintf(&mltaddr.sin6_addr),
                                    if_name(ifp), error);
                                /* XXX not very fatal, go on... */
                        }
                }
#ifdef __FreeBSD__
#undef hostnamelen
#endif
 
                /*
                 * join interface-local all-nodes address, on loopback.
                 * (ff01::1%ifN, and ff01::%ifN/32)
                 */
                mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
                mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
#ifdef __FreeBSD__
                rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
#else
                rt = rtalloc1((struct sockaddr *)&mltaddr, 0);
#endif
                if (rt) {
                        /* 32bit came from "mltmask" */
                        if (memcmp(&mltaddr.sin6_addr,
                            &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
                            32 / 8)) {
                                RTFREE(rt);
                                rt = NULL;
                        }
                }
                if (!rt) {
#if (defined(__bsdi__) && _BSDI_VERSION >= 199802)
                        struct rt_addrinfo info;
 
                        bzero(&info, sizeof(info));
                        info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr;
                        info.rti_info[RTAX_GATEWAY] =
                                (struct sockaddr *)&ia->ia_addr;
                        info.rti_info[RTAX_NETMASK] =
                                (struct sockaddr *)&mltmask;
                        info.rti_info[RTAX_IFA] =
                                (struct sockaddr *)&ia->ia_addr;
                        info.rti_flags = RTF_UP | RTF_CLONING;
                        error = rtrequest1(RTM_ADD, &info, NULL);
#else
                        error = rtrequest(RTM_ADD,
                                          (struct sockaddr *)&mltaddr,
                                          (struct sockaddr *)&ia->ia_addr,
                                          (struct sockaddr *)&mltmask,
                                          RTF_UP | RTF_CLONING,
                                          (struct rtentry **)0);
#endif
                        if (error)
                                goto cleanup;
                } else {
                        RTFREE(rt);
                }
 
                imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error);
                if (imm) {
                        LIST_INSERT_HEAD(&ia->ia6_memberships, imm,
                            i6mm_chain);
                } else {
                        log(LOG_WARNING, "in6_update_ifa: "
                            "addmulti failed for %s on %s "
                            "(errno=%d)\n",
                            ip6_sprintf(&mltaddr.sin6_addr),
                            if_name(ifp), error);
                        goto cleanup;
                }
        }
 
#ifdef MEASURE_PERFORMANCE
        {
                int s = splnet();
                if (new_ifa)
                        in6h_addifa(ia);
                else
                        in6h_rebuild(0);
                splx(s);
        }
#endif
 
        /*
         * make sure to initialize ND6 information.  this is to workaround
         * issues with interfaces with IPv6 addresses, which have never brought
         * up.  We are assuming that it is safe to nd6_ifattach multiple times.
         */
        nd6_ifattach(ifp);
 
        /*
         * Perform DAD, if needed.
         * XXX It may be of use, if we can administratively
         * disable DAD.
         */
#ifdef MIP6
        if (hostIsNew && in6if_do_dad(ifp) && mip6_ifa_need_dad(ia) &&
            (ifra->ifra_flags & IN6_IFF_NODAD) == 0)
#else /* MIP6 */
        if (hostIsNew && in6if_do_dad(ifp) &&
            (ifra->ifra_flags & IN6_IFF_NODAD) == 0)
#endif /* MIP6 */
        {
                nd6_dad_start((struct ifaddr *)ia, NULL);
        }
 
        return(error);
 
  unlink:
        /*
         * XXX: if a change of an existing address failed, keep the entry
         * anyway.
         */
        if (hostIsNew)
                in6_unlink_ifa(ia, ifp);
        return(error);
 
  cleanup:
        in6_purgeaddr(&ia->ia_ifa);
        return error;
}
 
void
in6_purgeaddr(ifa)
        struct ifaddr *ifa;
{
        struct ifnet *ifp = ifa->ifa_ifp;
        struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
        struct in6_multi_mship *imm;
 
        /* stop DAD processing */
        nd6_dad_stop(ifa);
 
        /*
         * delete route to the destination of the address being purged.
         * The interface must be p2p or loopback in this case.
         */
        if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
                int e;
 
                if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
                    != 0) {
                        log(LOG_ERR, "in6_purgeaddr: failed to remove "
                            "a route to the p2p destination: %s on %s, "
                            "errno=%d\n",
                            ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
                            e);
                        /* proceed anyway... */
                }
                else
                        ia->ia_flags &= ~IFA_ROUTE;
        }
 
        /* Remove ownaddr's loopback rtentry, if it exists. */
        in6_ifremloop(&(ia->ia_ifa));
 
        /*
         * leave from multicast groups we have joined for the interface
         */
        while ((imm = ia->ia6_memberships.lh_first) != NULL) {
                LIST_REMOVE(imm, i6mm_chain);
                in6_leavegroup(imm);
        }
 
        in6_unlink_ifa(ia, ifp);
}
 
int
in6_update_ifa(ifp, ifra, ia)
        struct ifnet *ifp;
        struct in6_aliasreq *ifra;
        struct in6_ifaddr *ia;
{
    int res;
    int s = splnet();
//    extern int irq_level;
//    if (irq_level) {
//        diag_printf("%s - called from IRQ!\n", __FUNCTION__);
//    }
    res = _in6_update_ifa(ifp, ifra, ia);
    splx(s);
    return res;
}
 
static void
in6_unlink_ifa(ia, ifp)
        struct in6_ifaddr *ia;
        struct ifnet *ifp;
{
        struct in6_ifaddr *oia;
#ifdef __NetBSD__
        int     s = splsoftnet();
#else
        int     s = splnet();
#endif
 
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
        struct ifaddr *ifa;
#endif
 
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
        if ((ifa = ifp->if_addrlist) == ia62ifa(ia))
                ifp->if_addrlist = ifa->ifa_next;
        else {
                while (ifa->ifa_next &&
                       (ifa->ifa_next != ia62ifa(ia)))
                        ifa = ifa->ifa_next;
                if (ifa->ifa_next)
                        ifa->ifa_next = ia62ifa(ia)->ifa_next;
                else {
                        /* search failed */
                        printf("Couldn't unlink in6_ifaddr from ifp\n");
                }
        }
#else
        TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
        log_(LOG_ADDR) {
            diag_printf("%s.%d - After removing %p into list %p\n",
                        __FUNCTION__, __LINE__,
                        &ia->ia_ifa, &ifp->if_addrlist);
            _show_ifp(ifp);
        }
#endif
#ifdef __NetBSD__
        /* release a refcnt for the link from if_addrlist */
        IFAFREE(&ia->ia_ifa);
#endif
 
        oia = ia;
        if (oia == (ia = in6_ifaddr))
                in6_ifaddr = ia->ia_next;
        else {
                while (ia->ia_next && (ia->ia_next != oia))
                        ia = ia->ia_next;
                if (ia->ia_next)
                        ia->ia_next = oia->ia_next;
                else {
                        /* search failed */
                        printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
                }
        }
 
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
        if (oia->ia6_multiaddrs.lh_first != NULL) {
#ifdef __NetBSD__
                /*
                 * XXX thorpej@netbsd.org -- if the interface is going
                 * XXX away, don't save the multicast entries, delete them!
                 */
                if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) {
                        struct in6_multi *in6m;
 
                        while ((in6m =
                            LIST_FIRST(&oia->ia6_multiaddrs)) != NULL)
                                in6_delmulti(in6m);
                } else
                        in6_savemkludge(oia);
#else
                in6_savemkludge(oia);
#endif
        }
#endif
 
#ifdef MEASURE_PERFORMANCE
        in6h_delifa(oia);
#endif
 
        /*
         * When an autoconfigured address is being removed, release the
         * reference to the base prefix.  Also, since the release might
         * affect the status of other (detached) addresses, call
         * pfxlist_onlink_check().
         */
        if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) {
                if (oia->ia6_ndpr == NULL) {
                        log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address "
                            "%p has no prefix\n", oia);
                } else {
                        oia->ia6_ndpr->ndpr_refcnt--;
                        oia->ia6_flags &= ~IN6_IFF_AUTOCONF;
                        oia->ia6_ndpr = NULL;
                }
 
                pfxlist_onlink_check();
        }
 
        /*
         * release another refcnt for the link from in6_ifaddr.
         * Note that we should decrement the refcnt at least once for all *BSD.
         */
        IFAFREE(&oia->ia_ifa);
 
        splx(s);
}
 
void
in6_purgeif(ifp)
        struct ifnet *ifp;
{
        struct ifaddr *ifa, *nifa;
 
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
        for (ifa = ifp->if_addrlist; ifa; ifa = nifa)
#else
        for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa)
#endif
        {
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
                nifa = ifa->ifa_next;
#else
                nifa = TAILQ_NEXT(ifa, ifa_list);
#endif
                if (ifa->ifa_addr->sa_family != AF_INET6)
                        continue;
                in6_purgeaddr(ifa);
        }
 
#if !(defined(__bsdi__) && _BSDI_VERSION >= 199802)
        in6_ifdetach(ifp);
#endif
}
 
/*
 * SIOC[GAD]LIFADDR.
 *      SIOCGLIFADDR: get first address. (?)
 *      SIOCGLIFADDR with IFLR_PREFIX:
 *              get first address that matches the specified prefix.
 *      SIOCALIFADDR: add the specified address.
 *      SIOCALIFADDR with IFLR_PREFIX:
 *              add the specified prefix, filling hostid part from
 *              the first link-local address.  prefixlen must be <= 64.
 *      SIOCDLIFADDR: delete the specified address.
 *      SIOCDLIFADDR with IFLR_PREFIX:
 *              delete the first address that matches the specified prefix.
 * return values:
 *      EINVAL on invalid parameters
 *      EADDRNOTAVAIL on prefix match failed/specified address not found
 *      other values may be returned from in6_ioctl()
 *
 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
 * this is to accomodate address naming scheme other than RFC2374,
 * in the future.
 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
 * address encoding scheme. (see figure on page 8)
 */
static int
#if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3)
in6_lifaddr_ioctl(so, cmd, data, ifp, p)
        struct socket *so;
        u_long cmd;
        caddr_t data;
        struct ifnet *ifp;
        struct proc *p;
#else
in6_lifaddr_ioctl(so, cmd, data, ifp)
        struct socket *so;
        u_long cmd;
        caddr_t data;
        struct ifnet *ifp;
#endif
{
        struct if_laddrreq *iflr = (struct if_laddrreq *)data;
        struct ifaddr *ifa;
        struct sockaddr *sa;
        int64_t zoneid;
 
        /* sanity checks */
        if (!data || !ifp) {
                panic("invalid argument to in6_lifaddr_ioctl");
                /* NOTREACHED */
        }
 
        switch (cmd) {
        case SIOCGLIFADDR:
                /* address must be specified on GET with IFLR_PREFIX */
                if ((iflr->flags & IFLR_PREFIX) == 0)
                        break;
                /* FALLTHROUGH */
        case SIOCALIFADDR:
        case SIOCDLIFADDR:
                /* address must be specified on ADD and DELETE */
                sa = (struct sockaddr *)&iflr->addr;
                if (sa->sa_family != AF_INET6)
                        return EINVAL;
                if (sa->sa_len != sizeof(struct sockaddr_in6))
                        return EINVAL;
                /* XXX need improvement */
                sa = (struct sockaddr *)&iflr->dstaddr;
                if (sa->sa_family && sa->sa_family != AF_INET6)
                        return EINVAL;
                if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
                        return EINVAL;
                break;
        default: /* shouldn't happen */
#if 0
                panic("invalid cmd to in6_lifaddr_ioctl");
                /* NOTREACHED */
#else
                return EOPNOTSUPP;
#endif
        }
        if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
                return EINVAL;
 
        switch (cmd) {
        case SIOCALIFADDR:
            {
                struct in6_aliasreq ifra;
                struct in6_addr *hostid = NULL;
                int prefixlen;
 
                if ((iflr->flags & IFLR_PREFIX) != 0) {
                        struct sockaddr_in6 *sin6;
 
                        /*
                         * hostid is to fill in the hostid part of the
                         * address.  hostid points to the first link-local
                         * address attached to the interface.
                         */
                        ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
                        if (!ifa)
                                return EADDRNOTAVAIL;
                        hostid = IFA_IN6(ifa);
 
                        /* prefixlen must be <= 64. */
                        if (64 < iflr->prefixlen)
                                return EINVAL;
                        prefixlen = iflr->prefixlen;
 
                        /* hostid part must be zero. */
                        sin6 = (struct sockaddr_in6 *)&iflr->addr;
                        if (sin6->sin6_addr.s6_addr32[2] != 0
                         || sin6->sin6_addr.s6_addr32[3] != 0) {
                                return EINVAL;
                        }
                } else
                        prefixlen = iflr->prefixlen;
 
                /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
                bzero(&ifra, sizeof(ifra));
                bcopy(iflr->iflr_name, ifra.ifra_name,
                        sizeof(ifra.ifra_name));
 
                bcopy(&iflr->addr, &ifra.ifra_addr,
                        ((struct sockaddr *)&iflr->addr)->sa_len);
                if (hostid) {
                        /* fill in hostid part */
                        ifra.ifra_addr.sin6_addr.s6_addr32[2] =
                                hostid->s6_addr32[2];
                        ifra.ifra_addr.sin6_addr.s6_addr32[3] =
                                hostid->s6_addr32[3];
                }
 
                if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
                        bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
                                ((struct sockaddr *)&iflr->dstaddr)->sa_len);
                        if (hostid) {
                                ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
                                        hostid->s6_addr32[2];
                                ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
                                        hostid->s6_addr32[3];
                        }
                }
 
                ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
                in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
 
                ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
#if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3)
                return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, p);
#else
                return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp);
#endif
            }
        case SIOCGLIFADDR:
        case SIOCDLIFADDR:
            {
                struct in6_ifaddr *ia;
                struct in6_addr mask, candidate, match;
                struct sockaddr_in6 *sin6;
                int cmp;
 
                bzero(&mask, sizeof(mask));
                if (iflr->flags & IFLR_PREFIX) {
                        /* lookup a prefix rather than address. */
                        in6_prefixlen2mask(&mask, iflr->prefixlen);
 
                        sin6 = (struct sockaddr_in6 *)&iflr->addr;
                        bcopy(&sin6->sin6_addr, &match, sizeof(match));
                        match.s6_addr32[0] &= mask.s6_addr32[0];
                        match.s6_addr32[1] &= mask.s6_addr32[1];
                        match.s6_addr32[2] &= mask.s6_addr32[2];
                        match.s6_addr32[3] &= mask.s6_addr32[3];
 
                        /* if you set extra bits, that's wrong */
                        if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
                                return EINVAL;
 
                        cmp = 1;
                } else {
                        if (cmd == SIOCGLIFADDR) {
                                /* on getting an address, take the 1st match */
                                cmp = 0; /* XXX */
                        } else {
                                /* on deleting an address, do exact match */
                                in6_prefixlen2mask(&mask, 128);
                                sin6 = (struct sockaddr_in6 *)&iflr->addr;
                                bcopy(&sin6->sin6_addr, &match, sizeof(match));
 
                                cmp = 1;
                        }
                }
 
#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)
                                continue;
                        if (!cmp)
                                break;
 
                        bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
#ifndef SCOPEDROUTING
                        /*
                         * XXX: this is adhoc, but is necessary to allow
                         * a user to specify fe80::/64 (not /10) for a
                         * link-local address.
                         */
                        if (IN6_IS_ADDR_LINKLOCAL(&candidate))
                                candidate.s6_addr16[1] = 0;
#endif
                        candidate.s6_addr32[0] &= mask.s6_addr32[0];
                        candidate.s6_addr32[1] &= mask.s6_addr32[1];
                        candidate.s6_addr32[2] &= mask.s6_addr32[2];
                        candidate.s6_addr32[3] &= mask.s6_addr32[3];
                        if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
                                break;
                }
                if (!ifa)
                        return EADDRNOTAVAIL;
                ia = ifa2ia6(ifa);
 
                if (cmd == SIOCGLIFADDR) {
#ifndef SCOPEDROUTING
                        struct sockaddr_in6 *s6;
#endif
 
                        /* fill in the if_laddrreq structure */
                        bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
#ifndef SCOPEDROUTING           /* XXX see above */
                        s6 = (struct sockaddr_in6 *)&iflr->addr;
                        if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
                                s6->sin6_addr.s6_addr16[1] = 0;
                                zoneid = in6_addr2zoneid(ifp, &s6->sin6_addr);
                                if (zoneid < 0) /* XXX: should not happen */
                                        return(EINVAL);
                                s6->sin6_scope_id = zoneid;
                        }
#endif
                        if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
                                bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
                                        ia->ia_dstaddr.sin6_len);
#ifndef SCOPEDROUTING           /* XXX see above */
                                s6 = (struct sockaddr_in6 *)&iflr->dstaddr;
                                if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
                                        s6->sin6_addr.s6_addr16[1] = 0;
                                        zoneid = in6_addr2zoneid(ifp,
                                                                 &s6->sin6_addr);
                                        if (zoneid < 0) /* XXX */
                                                return(EINVAL);
                                        s6->sin6_scope_id = zoneid;
                                }
#endif
                        } else
                                bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 
                        iflr->prefixlen =
                                in6_mask2len(&ia->ia_prefixmask.sin6_addr,
                                             NULL);
 
                        iflr->flags = ia->ia6_flags;    /* XXX */
 
                        return 0;
                } else {
                        struct in6_aliasreq ifra;
 
                        /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
                        bzero(&ifra, sizeof(ifra));
                        bcopy(iflr->iflr_name, ifra.ifra_name,
                                sizeof(ifra.ifra_name));
 
                        bcopy(&ia->ia_addr, &ifra.ifra_addr,
                                ia->ia_addr.sin6_len);
                        if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
                                bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
                                        ia->ia_dstaddr.sin6_len);
                        } else {
                                bzero(&ifra.ifra_dstaddr,
                                    sizeof(ifra.ifra_dstaddr));
                        }
                        bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
                                ia->ia_prefixmask.sin6_len);
 
                        ifra.ifra_flags = ia->ia6_flags;
#if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3)
                        return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
                                ifp, p);
#else
                        return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
                                ifp);
#endif
                }
            }
        }
 
        return EOPNOTSUPP;      /* just for safety */
}
 
/*
 * Initialize an interface's intetnet6 address
 * and routing table entry.
 */
static int
in6_ifinit(ifp, ia, sin6, newhost)
        struct ifnet *ifp;
        struct in6_ifaddr *ia;
        struct sockaddr_in6 *sin6;
        int newhost;
{
        int     error = 0, plen, ifacount = 0;
        int     s = splimp();
        struct ifaddr *ifa;
 
        /*
         * Give the interface a chance to initialize
         * if this is its first address,
         * and to validate the address if necessary.
         */
#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 == NULL)
                        continue;       /* just for safety */
                if (ifa->ifa_addr->sa_family != AF_INET6)
                        continue;
                ifacount++;
        }
 
        ia->ia_addr = *sin6;
 
        if (ifacount <= 1 && ifp->if_ioctl &&
            (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
                splx(s);
                return(error);
        }
        splx(s);
 
        ia->ia_ifa.ifa_metric = ifp->if_metric;
 
        /* we could do in(6)_socktrim here, but just omit it at this moment. */
 
        /*
         * Special case:
         * If the destination address is specified for a point-to-point
         * interface, install a route to the destination as an interface
         * direct route.
         */
        plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
        if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) {
                if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD,
                                    RTF_UP | RTF_HOST)) != 0)
                        return(error);
                ia->ia_flags |= IFA_ROUTE;
        }
        if (plen < 128) {
                /*
                 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
                 */
                ia->ia_ifa.ifa_flags |= RTF_CLONING;
        }
 
        /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
        if (newhost) {
                /* set the rtrequest function to create llinfo */
                ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
                in6_ifaddloop(&(ia->ia_ifa));
        }
 
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
        if (ifp->if_flags & IFF_MULTICAST)
                in6_restoremkludge(ia, ifp);
#endif
 
        return(error);
}
 
#if !(defined(__FreeBSD__) && __FreeBSD__ >= 3)
/*
 * Multicast address kludge:
 * If there were any multicast addresses attached to this interface address,
 * either move them to another address on this interface, or save them until
 * such time as this interface is reconfigured for IPv6.
 */
void
in6_savemkludge(oia)
        struct in6_ifaddr *oia;
{
        struct in6_ifaddr *ia;
        struct in6_multi *in6m, *next;
 
        IFP_TO_IA6(oia->ia_ifp, ia);
        if (ia) {       /* there is another address */
                for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){
                        next = in6m->in6m_entry.le_next;
                        IFAFREE(&in6m->in6m_ia->ia_ifa);
                        IFAREF(&ia->ia_ifa);
                        in6m->in6m_ia = ia;
                        LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
                }
        } else {        /* last address on this if deleted, save */
                struct multi6_kludge *mk;
 
                for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
                        if (mk->mk_ifp == oia->ia_ifp)
                                break;
                }
                if (mk == NULL) /* this should not happen! */
                        panic("in6_savemkludge: no kludge space");
 
                for (in6m = oia->ia6_multiaddrs.lh_first; in6m; in6m = next){
                        next = in6m->in6m_entry.le_next;
                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
                        in6m->in6m_ia = NULL;
                        LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry);
                }
        }
}
 
/*
 * Continuation of multicast address hack:
 * If there was a multicast group list previously saved for this interface,
 * then we re-attach it to the first address configured on the i/f.
 */
void
in6_restoremkludge(ia, ifp)
        struct in6_ifaddr *ia;
        struct ifnet *ifp;
{
        struct multi6_kludge *mk;
 
        for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
                if (mk->mk_ifp == ifp) {
                        struct in6_multi *in6m, *next;
 
                        for (in6m = mk->mk_head.lh_first; in6m; in6m = next) {
                                next = in6m->in6m_entry.le_next;
                                in6m->in6m_ia = ia;
                                IFAREF(&ia->ia_ifa);
                                LIST_INSERT_HEAD(&ia->ia6_multiaddrs,
                                                 in6m, in6m_entry);
                        }
                        LIST_INIT(&mk->mk_head);
                        break;
                }
        }
}
 
/*
 * Allocate space for the kludge at interface initialization time.
 * Formerly, we dynamically allocated the space in in6_savemkludge() with
 * malloc(M_WAITOK).  However, it was wrong since the function could be called
 * under an interrupt context (software timer on address lifetime expiration).
 * Also, we cannot just give up allocating the strucutre, since the group
 * membership structure is very complex and we need to keep it anyway.
 * Of course, this function MUST NOT be called under an interrupt context.
 * Specifically, it is expected to be called only from in6_ifattach(), though
 * it is a global function.
 */
void
in6_createmkludge(ifp)
        struct ifnet *ifp;
{
        struct multi6_kludge *mk;
 
        for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
                /* If we've already had one, do not allocate. */
                if (mk->mk_ifp == ifp)
                        return;
        }
 
        mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK);
 
        bzero(mk, sizeof(*mk));
        LIST_INIT(&mk->mk_head);
        mk->mk_ifp = ifp;
        LIST_INSERT_HEAD(&in6_mk, mk, mk_entry);
}
 
void
in6_purgemkludge(ifp)
        struct ifnet *ifp;
{
        struct multi6_kludge *mk;
        struct in6_multi *in6m;
 
        for (mk = in6_mk.lh_first; mk; mk = mk->mk_entry.le_next) {
                if (mk->mk_ifp != ifp)
                        continue;
 
                /* leave from all multicast groups joined */
                while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL)
                        in6_delmulti(in6m);
                LIST_REMOVE(mk, mk_entry);
                free(mk, M_IPMADDR);
                break;
        }
}
 
/*
 * Add an address to the list of IP6 multicast addresses for a
 * given interface.
 */
struct  in6_multi *
in6_addmulti(maddr6, ifp, errorp)
        struct in6_addr *maddr6;
        struct ifnet *ifp;
        int *errorp;
{
        struct  in6_ifaddr *ia;
        struct  in6_ifreq ifr;
        struct  in6_multi *in6m;
#ifdef __NetBSD__
        int     s = splsoftnet();
#else
        int     s = splnet();
#endif
 
        *errorp = 0;
        /*
         * See if address already in list.
         */
        IN6_LOOKUP_MULTI(*maddr6, ifp, in6m);
        if (in6m != NULL) {
                /*
                 * Found it; just increment the refrence count.
                 */
                in6m->in6m_refcount++;
        } else {
                /*
                 * New address; allocate a new multicast record
                 * and link it into the interface's multicast list.
                 */
                in6m = (struct in6_multi *)
                        malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
                if (in6m == NULL) {
                        splx(s);
                        *errorp = ENOBUFS;
                        return(NULL);
                }
                in6m->in6m_addr = *maddr6;
                in6m->in6m_ifp = ifp;
                in6m->in6m_refcount = 1;
                IFP_TO_IA6(ifp, ia);
                if (ia == NULL) {
                        free(in6m, M_IPMADDR);
                        splx(s);
                        *errorp = EADDRNOTAVAIL; /* appropriate? */
                        return(NULL);
                }
                in6m->in6m_ia = ia;
                IFAREF(&ia->ia_ifa); /* gain a reference */
                LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry);
 
                /*
                 * Ask the network driver to update its multicast reception
                 * filter appropriately for the new address.
                 */
                bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6));
                ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
                ifr.ifr_addr.sin6_family = AF_INET6;
                ifr.ifr_addr.sin6_addr = *maddr6;
                if (ifp->if_ioctl == NULL)
                        *errorp = ENXIO; /* XXX: appropriate? */
                else
                        *errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI,
                                                    (caddr_t)&ifr);
                if (*errorp) {
                        LIST_REMOVE(in6m, in6m_entry);
                        free(in6m, M_IPMADDR);
                        IFAFREE(&ia->ia_ifa);
                        splx(s);
                        return(NULL);
                }
                /*
                 * Let MLD6 know that we have joined a new IP6 multicast
                 * group.
                 */
                mld6_start_listening(in6m);
        }
        splx(s);
        return(in6m);
}
 
/*
 * Delete a multicast address record.
 */
void
in6_delmulti(in6m)
        struct in6_multi *in6m;
{
        struct  in6_ifreq ifr;
#ifdef __NetBSD__
        int     s = splsoftnet();
#else
        int     s = splnet();
#endif
 
        if (--in6m->in6m_refcount == 0) {
                /*
                 * No remaining claims to this record; let MLD6 know
                 * that we are leaving the multicast group.
                 */
                mld6_stop_listening(in6m);
 
                /*
                 * Unlink from list.
                 */
                LIST_REMOVE(in6m, in6m_entry);
                if (in6m->in6m_ia) {
                        IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */
                }
 
                /*
                 * Notify the network driver to update its multicast
                 * reception filter.
                 */
                bzero(&ifr.ifr_addr, sizeof(struct sockaddr_in6));
                ifr.ifr_addr.sin6_len = sizeof(struct sockaddr_in6);
                ifr.ifr_addr.sin6_family = AF_INET6;
                ifr.ifr_addr.sin6_addr = in6m->in6m_addr;
                (*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp,
                                            SIOCDELMULTI, (caddr_t)&ifr);
                free(in6m, M_IPMADDR);
        }
        splx(s);
}
#else /* not FreeBSD3 */
/*
 * Add an address to the list of IP6 multicast addresses for a
 * given interface.
 */
struct  in6_multi *
in6_addmulti(maddr6, ifp, errorp)
        struct in6_addr *maddr6;
        struct ifnet *ifp;
        int *errorp;
{
        struct  in6_multi *in6m;
        struct sockaddr_in6 sin6;
        struct ifmultiaddr *ifma;
        int     s = splnet();
 
        *errorp = 0;
 
        /*
         * Call generic routine to add membership or increment
         * refcount.  It wants addresses in the form of a sockaddr,
         * so we build one here (being careful to zero the unused bytes).
         */
        bzero(&sin6, sizeof sin6);
        sin6.sin6_family = AF_INET6;
        sin6.sin6_len = sizeof sin6;
        sin6.sin6_addr = *maddr6;
        *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma);
        if (*errorp) {
                splx(s);
                return 0;
        }
 
        /*
         * If ifma->ifma_protospec is null, then if_addmulti() created
         * a new record.  Otherwise, we are done.
         */
        if (ifma->ifma_protospec != 0)
                return ifma->ifma_protospec;
 
        /* XXX - if_addmulti uses M_WAITOK.  Can this really be called
           at interrupt time?  If so, need to fix if_addmulti. XXX */
        in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
        if (in6m == NULL) {
                splx(s);
                return (NULL);
        }
 
        bzero(in6m, sizeof *in6m);
        in6m->in6m_addr = *maddr6;
        in6m->in6m_ifp = ifp;
        in6m->in6m_ifma = ifma;
        ifma->ifma_protospec = in6m;
        LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry);
 
        /*
         * Let MLD6 know that we have joined a new IP6 multicast
         * group.
         */
        mld6_start_listening(in6m);
        splx(s);
        return(in6m);
}
 
/*
 * Delete a multicast address record.
 */
void
in6_delmulti(in6m)
        struct in6_multi *in6m;
{
        struct ifmultiaddr *ifma = in6m->in6m_ifma;
        int     s = splnet();
 
        if (ifma->ifma_refcount == 1) {
                /*
                 * No remaining claims to this record; let MLD6 know
                 * that we are leaving the multicast group.
                 */
                mld6_stop_listening(in6m);
                ifma->ifma_protospec = 0;
                LIST_REMOVE(in6m, in6m_entry);
                free(in6m, M_IPMADDR);
        }
        /* XXX - should be separate API for when we have an ifma? */
        if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
        splx(s);
}
#endif /* not FreeBSD3 */
 
struct in6_multi_mship *
in6_joingroup(ifp, addr, errorp)
        struct ifnet *ifp;
        struct in6_addr *addr;
        int *errorp;
{
        struct in6_multi_mship *imm;
 
        imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT);
        if (!imm) {
                *errorp = ENOBUFS;
                return NULL;
        }
        imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp);
        if (!imm->i6mm_maddr) {
                /* *errorp is alrady set */
                free(imm, M_IPMADDR);
                return NULL;
        }
        return imm;
}
 
int
in6_leavegroup(imm)
        struct in6_multi_mship *imm;
{
 
        if (imm->i6mm_maddr)
                in6_delmulti(imm->i6mm_maddr);
        free(imm,  M_IPMADDR);
        return 0;
}
 
/*
 * Find an IPv6 interface link-local address specific to an interface.
 */
struct in6_ifaddr *
in6ifa_ifpforlinklocal(ifp, ignoreflags)
        struct ifnet *ifp;
        int ignoreflags;
{
        struct ifaddr *ifa;
 
#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 == NULL)
                        continue;       /* just for safety */
                if (ifa->ifa_addr->sa_family != AF_INET6)
                        continue;
                if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
                        if ((((struct in6_ifaddr *)ifa)->ia6_flags &
                             ignoreflags) != 0)
                                continue;
                        break;
                }
        }
 
        return((struct in6_ifaddr *)ifa);
}
 
 
/*
 * find the internet address corresponding to a given interface and address.
 */
static struct in6_ifaddr *
_in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
{
        struct ifaddr *ifa;
 
#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 == NULL)
                        continue;       /* just for safety */
                if (ifa->ifa_addr->sa_family != AF_INET6)
                        continue;
                if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
                        break;
        }
 
        return((struct in6_ifaddr *)ifa);
}
 
struct in6_ifaddr *
in6ifa_ifpwithaddr(ifp, addr)
        struct ifnet *ifp;
        struct in6_addr *addr;
{
    struct in6_ifaddr *_ifa = _in6ifa_ifpwithaddr(ifp, addr);
#if 0
    if (!_ifa) {
        struct ifaddr *ifa;
 
        diag_printf("%s\n", __FUNCTION__);
        diag_dump_buf(addr, 16);
        diag_printf("==============================================================\n");
        TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
        {
                if (ifa->ifa_addr == NULL)
                        continue;       /* just for safety */
                if (ifa->ifa_addr->sa_family != AF_INET6)
                        continue;
                diag_dump_buf(IFA_IN6(ifa), 16);
                diag_printf("--------------------------------------------------------------\n");
        }
    }
#endif
    return(_ifa);
}
 
/*
 * Convert IP6 address to printable (loggable) representation.
 */
static char digits[] = "0123456789abcdef";
static int ip6round = 0;
char *
ip6_sprintf(addr)
        const struct in6_addr *addr;
{
        static char ip6buf[8][48];
        int i;
        char *cp;
        const u_short *a = (const u_short *)addr;
        const u_char *d;
        int dcolon = 0;
 
        ip6round = (ip6round + 1) & 7;
        cp = ip6buf[ip6round];
 
        for (i = 0; i < 8; i++) {
                if (dcolon == 1) {
                        if (*a == 0) {
                                if (i == 7)
                                        *cp++ = ':';
                                a++;
                                continue;
                        } else
                                dcolon = 2;
                }
                if (*a == 0) {
                        if (dcolon == 0 && *(a + 1) == 0) {
                                if (i == 0)
                                        *cp++ = ':';
                                *cp++ = ':';
                                dcolon = 1;
                        } else {
                                *cp++ = '0';
                                *cp++ = ':';
                        }
                        a++;
                        continue;
                }
                d = (const u_char *)a;
                *cp++ = digits[*d >> 4];
                *cp++ = digits[*d++ & 0xf];
                *cp++ = digits[*d >> 4];
                *cp++ = digits[*d & 0xf];
                *cp++ = ':';
                a++;
        }
        *--cp = 0;
        return(ip6buf[ip6round]);
}
 
int
in6_localaddr(in6)
        struct in6_addr *in6;
{
        struct in6_ifaddr *ia;
 
        if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
                return 1;
 
        for (ia = in6_ifaddr; ia; ia = ia->ia_next)
                if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
                                              &ia->ia_prefixmask.sin6_addr))
                        return 1;
 
        return (0);
}
 
int
in6_is_addr_deprecated(sa6)
        struct sockaddr_in6 *sa6;
{
        struct in6_ifaddr *ia;
 
        for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
                if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
                                       &sa6->sin6_addr) &&
#ifdef SCOPEDROUTING
                    ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id &&
#endif
                    (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
                        return(1); /* true */
 
                /* XXX: do we still have to go thru the rest of the list? */
        }
 
        return(0);               /* false */
}
 
/*
 * return length of part which dst and src are equal
 * hard coding...
 */
int
in6_matchlen(src, dst)
struct in6_addr *src, *dst;
{
        int match = 0;
        u_char *s = (u_char *)src, *d = (u_char *)dst;
        u_char *lim = s + 16, r;
 
        while (s < lim)
                if ((r = (*d++ ^ *s++)) != 0) {
                        while (r < 128) {
                                match++;
                                r <<= 1;
                        }
                        break;
                } else
                        match += 8;
        return match;
}
 
/* XXX: to be scope conscious */
int
in6_are_prefix_equal(p1, p2, len)
        struct in6_addr *p1, *p2;
        int len;
{
        int bytelen, bitlen;
 
        /* sanity check */
        if (0 > len || len > 128) {
                log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
                    len);
                return(0);
        }
 
        bytelen = len / 8;
        bitlen = len % 8;
 
        if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
                return(0);
        if (p1->s6_addr[bytelen] >> (8 - bitlen) !=
            p2->s6_addr[bytelen] >> (8 - bitlen))
                return(0);
 
        return(1);
}
 
void
in6_prefixlen2mask(maskp, len)
        struct in6_addr *maskp;
        int len;
{
        u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
        int bytelen, bitlen, i;
 
        /* sanity check */
        if (0 > len || len > 128) {
                log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
                    len);
                return;
        }
 
        bzero(maskp, sizeof(*maskp));
        bytelen = len / 8;
        bitlen = len % 8;
        for (i = 0; i < bytelen; i++)
                maskp->s6_addr[i] = 0xff;
        if (bitlen)
                maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
}
 
/*
 * return the best address out of the same scope. if no address was
 * found, return the first valid address from designated IF.
 */
struct in6_ifaddr *
in6_ifawithifp(ifp, dst)
        struct ifnet *ifp;
        struct in6_addr *dst;
{
        int dst_scope = in6_addrscope(dst), blen = -1, tlen;
        struct ifaddr *ifa;
        struct in6_ifaddr *besta = 0;
        struct in6_ifaddr *dep[2];      /* last-resort: deprecated */
 
        dep[0] = dep[1] = NULL;
 
        /*
         * We first look for addresses in the same scope.
         * If there is one, return it.
         * If two or more, return one which matches the dst longest.
         * If none, return one of global addresses assigned other ifs.
         */
#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)
                        continue;
                if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
                        continue; /* XXX: is there any case to allow anycast? */
                if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
                        continue; /* don't use this interface */
                if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
                        continue;
                if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
                        if (ip6_use_deprecated)
                                dep[0] = (struct in6_ifaddr *)ifa;
                        continue;
                }
 
                if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
                        /*
                         * call in6_matchlen() as few as possible
                         */
                        if (besta) {
                                if (blen == -1)
                                        blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
                                tlen = in6_matchlen(IFA_IN6(ifa), dst);
                                if (tlen > blen) {
                                        blen = tlen;
                                        besta = (struct in6_ifaddr *)ifa;
                                }
                        } else
                                besta = (struct in6_ifaddr *)ifa;
                }
        }
        if (besta)
                return(besta);
 
#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)
                        continue;
                if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
                        continue; /* XXX: is there any case to allow anycast? */
                if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
                        continue; /* don't use this interface */
                if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
                        continue;
                if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
                        if (ip6_use_deprecated)
                                dep[1] = (struct in6_ifaddr *)ifa;
                        continue;
                }
 
                return (struct in6_ifaddr *)ifa;
        }
 
        /* use the last-resort values, that are, deprecated addresses */
        if (dep[0])
                return dep[0];
        if (dep[1])
                return dep[1];
 
        return NULL;
}
 
/*
 * perform DAD when interface becomes IFF_UP.
 */
void
in6_if_up(ifp)
        struct ifnet *ifp;
{
        struct ifaddr *ifa;
        struct in6_ifaddr *ia;
        int dad_delay;          /* delay ticks before DAD output */
 
        /*
         * special cases, like 6to4, are handled in in6_ifattach
         */
        in6_ifattach(ifp, NULL);
 
        dad_delay = 0;
#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)
                        continue;
                ia = (struct in6_ifaddr *)ifa;
                if (ia->ia6_flags & IN6_IFF_TENTATIVE)
                        nd6_dad_start(ifa, &dad_delay);
        }
}
 
int
in6if_do_dad(ifp)
        struct ifnet *ifp;
{
        if ((ifp->if_flags & IFF_LOOPBACK) != 0)
                return(0);
 
        switch (ifp->if_type) {
#ifdef IFT_DUMMY
        case IFT_DUMMY:
#endif
        case IFT_FAITH:
                /*
                 * These interfaces do not have the IFF_LOOPBACK flag,
                 * but loop packets back.  We do not have to do DAD on such
                 * interfaces.  We should even omit it, because loop-backed
                 * NS would confuse the DAD procedure.
                 */
                return(0);
        default:
                /*
                 * Our DAD routine requires the interface up and running.
                 * However, some interfaces can be up before the RUNNING
                 * status.  Additionaly, users may try to assign addresses
                 * before the interface becomes up (or running).
                 * We simply skip DAD in such a case as a work around.
                 * XXX: we should rather mark "tentative" on such addresses,
                 * and do DAD after the interface becomes ready.
                 */
                if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
                    (IFF_UP|IFF_RUNNING))
                        return(0);
 
                return(1);
        }
}
 
/*
 * Calculate max IPv6 MTU through all the interfaces and store it
 * to in6_maxmtu.
 */
void
in6_setmaxmtu()
{
        unsigned long maxmtu = 0;
        struct ifnet *ifp;
 
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
        for (ifp = ifnet; ifp; ifp = ifp->if_next)
#else
        for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
#endif
        {
                if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
                    nd_ifinfo[ifp->if_index].linkmtu > maxmtu)
                        maxmtu =  nd_ifinfo[ifp->if_index].linkmtu;
        }
        if (maxmtu)     /* update only when maxmtu is positive */
                in6_maxmtu = maxmtu;
}
 
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
/*
 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
 * v4 mapped addr or v4 compat addr
 */
void
in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
{
        bzero(sin, sizeof(*sin));
        sin->sin_len = sizeof(struct sockaddr_in);
        sin->sin_family = AF_INET;
        sin->sin_port = sin6->sin6_port;
        sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
}
 
/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
void
in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
{
        bzero(sin6, sizeof(*sin6));
        sin6->sin6_len = sizeof(struct sockaddr_in6);
        sin6->sin6_family = AF_INET6;
        sin6->sin6_port = sin->sin_port;
        sin6->sin6_addr.s6_addr32[0] = 0;
        sin6->sin6_addr.s6_addr32[1] = 0;
        sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
        sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
}
 
/* Convert sockaddr_in6 into sockaddr_in. */
void
in6_sin6_2_sin_in_sock(struct sockaddr *nam)
{
        struct sockaddr_in *sin_p;
        struct sockaddr_in6 sin6;
 
        /*
         * Save original sockaddr_in6 addr and convert it
         * to sockaddr_in.
         */
        sin6 = *(struct sockaddr_in6 *)nam;
        sin_p = (struct sockaddr_in *)nam;
        in6_sin6_2_sin(sin_p, &sin6);
}
 
/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
void
in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
{
        struct sockaddr_in *sin_p;
        struct sockaddr_in6 *sin6_p;
 
        MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
               M_WAITOK);
        sin_p = (struct sockaddr_in *)*nam;
        in6_sin_2_v4mapsin6(sin_p, sin6_p);
        FREE(*nam, M_SONAME);
        *nam = (struct sockaddr *)sin6_p;
}
#endif /* freebsd3 */
 
#ifdef MEASURE_PERFORMANCE
#define IN6_MAXADDRHASH 1000
#ifndef IN6_ADDRHASH
#ifndef INET6_SERVER
#define IN6_ADDRHASH    23
#else
#define IN6_ADDRHASH    997
#endif
#endif
 
static struct in6hash in6h_hash_any = { NULL, IN6ADDR_ANY_INIT, NULL, 0 };
struct in6hash *in6hash[IN6_MAXADDRHASH];/* hash buckets for local IPv6 addrs */
int in6_nhash = IN6_ADDRHASH;           /* number of hash buckets for addrs */
int in6_hash_nullhit;
 
#define HASH6(in6) ((in6)->s6_addr32[0]^(in6)->s6_addr32[1]^\
        (in6)->s6_addr32[2]^(in6)->s6_addr32[3])
 
/*
 * Initialize the hash by adding entries for IN6ADDR_ANY
 */
struct in6hash *ih_cache = NULL;
 
void
in6h_hashinit()
{
        in6h_addhash(&in6h_hash_any);
}
 
void
in6h_addifa(ia)
        struct in6_ifaddr *ia;
{
        if (ia->ia6_hash.in6h_ifa == NULL)
                ia->ia6_hash.in6h_ifa = ia;
 
        ia->ia6_hash.in6h_addr = IA6_SIN6(ia)->sin6_addr; /* scope? */
        if (IN6_IS_ADDR_UNSPECIFIED(&ia->ia6_hash.in6h_addr))
                return;
        in6h_addhash(&ia->ia6_hash);
}
 
/*
 * Rebuild the hash when any interface addresses have been changed.
 * Since this should happen infrequently we remove all the interfaces
 * from the hash and add them all back.  This insures that the order
 * of addresses in the hash is consistent.
 */
void
in6h_rebuild(newhashsiz)
        int newhashsiz;         /* can be 0, meaning unchange the size */
{
        struct in6_ifaddr *ia;
 
        if (newhashsiz > IN6_MAXADDRHASH)
                return;         /* XXX invalid */
 
        for (ia = in6_ifaddr; ia != NULL; ia = ia->ia_next)
                in6h_delifa(ia);
 
        if (newhashsiz)
                in6_nhash = newhashsiz;
 
        for (ia = in6_ifaddr; ia != NULL; ia = ia->ia_next)
                in6h_addifa(ia);
}
 
/* Remove hash entries for local address on an in6_ifaddr. */
void
in6h_delifa(ia)
        struct in6_ifaddr *ia;
{
        if (IN6_IS_ADDR_UNSPECIFIED(&ia->ia6_hash.in6h_addr))
                return;
        in6h_delhash(&ia->ia6_hash);
        ia->ia6_hash.in6h_addr = in6addr_any;
}
 
static void
in6h_addhash(ih)
        struct in6hash *ih;
{
        struct in6hash **prev;
 
        /* Add to tail of hash list, as address is at end of address list */
        for (prev = &in6hash[HASH6(&ih->in6h_addr) % in6_nhash]; *prev;
             prev = &((*prev)->in6h_next)) {
                /* however, we always prefer non-global addresses */
                if (IN6_IS_ADDR_LINKLOCAL(&(*prev)->in6h_addr))
                        break;
        }
        ih->in6h_next = *prev;
        *prev = ih;
}
 
static void
in6h_delhash(ih)
        struct in6hash *ih;
{
        struct in6hash **prev;
 
        ih_cache = NULL;
 
        for (prev = &in6hash[HASH6(&ih->in6h_addr) % in6_nhash];
             *prev != ih; prev = &((*prev)->in6h_next)) {
#ifdef DEBUG
                if (*prev == NULL)
                        panic("in6h_delhash: lost entry");
#endif
        }
        *prev = (*prev)->in6h_next;
}
 
/*
 * Look up hash structure for specified IP address
 * and (optional) interface; matches any interface
 * if ifp is null, or this address is not associated
 * with the specified interface.
 */
struct in6hash *
in6h_lookup(addr, ifp)
        const struct in6_addr *addr;
        struct ifnet *ifp;
{
        struct in6hash *ih, *maybe_ih = NULL;
 
        /* just for measurement */
        if ((ih = in6hash[HASH6(addr) % in6_nhash]) == NULL)
                in6_hash_nullhit++;
 
        for (; ih; ih = ih->in6h_next) {
                if (IN6_ARE_ADDR_EQUAL(&ih->in6h_addr, addr)) {
                        ih->in6h_hit++;
 
                        if (ih->in6h_ifa == NULL ||
                            ih->in6h_ifa->ia_ifp == ifp || ifp == NULL) {
                                ih_cache = ih;
                                return (ih);
                        }
                        if (maybe_ih == NULL)
                                maybe_ih = ih;
                }
                else
                        ih->in6h_miss++;
        }
        if (maybe_ih)
                ih_cache = maybe_ih;
        return (maybe_ih);
}
#endif /* MEASURE_PERFORMANCE */
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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [net/] [bsd_tcpip/] [v2_0/] [src/] [sys/] [netinet6/] [in6.c] - Blame information for rev 174

Line No.	Rev	Author	Line
1	27	unneback	`//==========================================================================`
2			`//`
3			`// src/sys/netinet6/in6.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: in6.c,v 1.256 2001/12/24 10:39:29 jinmei 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