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Annotation of src/sys/netinet6/in6_ifattach.c, Revision 1.79

1.79    ! dyoung      1: /*     $NetBSD: in6_ifattach.c,v 1.78 2007/12/05 23:47:18 dyoung Exp $ */
1.37      itojun      2: /*     $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei Exp $  */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.24      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.24      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
1.39      lukem      32:
                     33: #include <sys/cdefs.h>
1.79    ! dyoung     34: __KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.78 2007/12/05 23:47:18 dyoung Exp $");
1.2       itojun     35:
                     36: #include <sys/param.h>
                     37: #include <sys/systm.h>
                     38: #include <sys/malloc.h>
                     39: #include <sys/socket.h>
                     40: #include <sys/sockio.h>
1.13      itojun     41: #include <sys/kernel.h>
1.34      itojun     42: #include <sys/syslog.h>
1.13      itojun     43: #include <sys/md5.h>
1.2       itojun     44:
                     45: #include <net/if.h>
                     46: #include <net/if_dl.h>
                     47: #include <net/if_types.h>
                     48: #include <net/route.h>
                     49:
                     50: #include <netinet/in.h>
                     51: #include <netinet/in_var.h>
                     52:
1.19      itojun     53: #include <netinet/ip6.h>
1.2       itojun     54: #include <netinet6/in6_ifattach.h>
                     55: #include <netinet6/ip6_var.h>
                     56: #include <netinet6/nd6.h>
1.55      itojun     57: #include <netinet6/ip6_mroute.h>
1.63      rpaulo     58: #include <netinet6/scope6_var.h>
1.2       itojun     59:
1.13      itojun     60: #include <net/net_osdep.h>
                     61:
1.2       itojun     62: unsigned long in6_maxmtu = 0;
                     63:
1.48      itojun     64: int ip6_auto_linklocal = 1;    /* enable by default */
                     65:
1.72      ad         66: callout_t in6_tmpaddrtimer_ch;
1.64      rpaulo     67:
                     68:
                     69: #if 0
1.74      dyoung     70: static int get_hostid_ifid(struct ifnet *, struct in6_addr *);
1.64      rpaulo     71: #endif
1.74      dyoung     72: static int get_rand_ifid(struct ifnet *, struct in6_addr *);
                     73: static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
                     74: static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
                     75: static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
                     76: static int in6_ifattach_loopback(struct ifnet *);
1.25      itojun     77:
                     78: #define EUI64_GBIT     0x01
                     79: #define EUI64_UBIT     0x02
1.54      perry      80: #define EUI64_TO_IFID(in6)     do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0)
1.25      itojun     81: #define EUI64_GROUP(in6)       ((in6)->s6_addr[8] & EUI64_GBIT)
                     82: #define EUI64_INDIVIDUAL(in6)  (!EUI64_GROUP(in6))
                     83: #define EUI64_LOCAL(in6)       ((in6)->s6_addr[8] & EUI64_UBIT)
                     84: #define EUI64_UNIVERSAL(in6)   (!EUI64_LOCAL(in6))
                     85:
                     86: #define IFID_LOCAL(in6)                (!EUI64_LOCAL(in6))
                     87: #define IFID_UNIVERSAL(in6)    (!EUI64_UNIVERSAL(in6))
                     88:
1.64      rpaulo     89: #define GEN_TEMPID_RETRY_MAX 5
                     90:
                     91: #if 0
                     92: /*
                     93:  * Generate a last-resort interface identifier from hostid.
                     94:  * works only for certain architectures (like sparc).
                     95:  * also, using hostid itself may constitute a privacy threat, much worse
                     96:  * than MAC addresses (hostids are used for software licensing).
                     97:  * maybe we should use MD5(hostid) instead.
1.71      christos   98:  *
                     99:  * in6 - upper 64bits are preserved
1.64      rpaulo    100:  */
                    101: static int
1.71      christos  102: get_hostid_ifid(struct ifnet *ifp, struct in6_addr *in6)
1.64      rpaulo    103: {
                    104:        int off, len;
                    105:        static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
                    106:        static const uint8_t allone[8] =
                    107:            { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
                    108:
                    109:        if (!hostid)
                    110:                return -1;
                    111:
                    112:        /* get up to 8 bytes from the hostid field - should we get */
                    113:        len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid);
                    114:        off = sizeof(*in6) - len;
                    115:        memcpy(&in6->s6_addr[off], &hostid, len);
                    116:
                    117:        /* make sure we do not return anything bogus */
                    118:        if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero)))
                    119:                return -1;
                    120:        if (memcmp(&in6->s6_addr[8], allone, sizeof(allone)))
                    121:                return -1;
                    122:
                    123:        /* make sure to set "u" bit to local, and "g" bit to individual. */
                    124:        in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
                    125:        in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
                    126:
                    127:        /* convert EUI64 into IPv6 interface identifier */
                    128:        EUI64_TO_IFID(in6);
                    129:
                    130:        return 0;
                    131: }
                    132: #endif
                    133:
1.25      itojun    134: /*
                    135:  * Generate a last-resort interface identifier, when the machine has no
                    136:  * IEEE802/EUI64 address sources.
                    137:  * The goal here is to get an interface identifier that is
                    138:  * (1) random enough and (2) does not change across reboot.
                    139:  * We currently use MD5(hostname) for it.
                    140:  */
                    141: static int
1.67      christos  142: get_rand_ifid(struct ifnet *ifp,
1.66      christos  143:        struct in6_addr *in6)   /* upper 64bits are preserved */
1.25      itojun    144: {
                    145:        MD5_CTX ctxt;
                    146:        u_int8_t digest[16];
                    147:
                    148: #if 0
                    149:        /* we need at least several letters as seed for ifid */
                    150:        if (hostnamelen < 3)
                    151:                return -1;
                    152: #endif
                    153:
                    154:        /* generate 8 bytes of pseudo-random value. */
1.64      rpaulo    155:        memset(&ctxt, 0, sizeof(ctxt));
1.25      itojun    156:        MD5Init(&ctxt);
1.50      itojun    157:        MD5Update(&ctxt, (u_char *)hostname, hostnamelen);
1.25      itojun    158:        MD5Final(digest, &ctxt);
                    159:
                    160:        /* assumes sizeof(digest) > sizeof(ifid) */
1.64      rpaulo    161:        memcpy(&in6->s6_addr[8], digest, 8);
1.2       itojun    162:
1.25      itojun    163:        /* make sure to set "u" bit to local, and "g" bit to individual. */
                    164:        in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
                    165:        in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
                    166:
                    167:        /* convert EUI64 into IPv6 interface identifier */
                    168:        EUI64_TO_IFID(in6);
                    169:
                    170:        return 0;
                    171: }
1.2       itojun    172:
1.64      rpaulo    173: static int
1.71      christos  174: generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
1.64      rpaulo    175: {
                    176:        MD5_CTX ctxt;
                    177:        u_int8_t seed[16], digest[16], nullbuf[8];
                    178:        u_int32_t val32;
                    179:        /*
                    180:         * interface ID for subnet anycast addresses.
                    181:         * XXX: we assume the unicast address range that requires IDs
                    182:         * in EUI-64 format.
                    183:         */
                    184:        static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff,
                    185:            0xff, 0xff, 0xff, 0x80 };
                    186:        static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe };
                    187:        int badid, retry = 0;
                    188:
                    189:        /* If there's no hisotry, start with a random seed. */
                    190:        memset(nullbuf, 0, sizeof(nullbuf));
                    191:        if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
                    192:                int i;
                    193:
                    194:                for (i = 0; i < 2; i++) {
                    195:                        val32 = arc4random();
                    196:                        memcpy(seed + sizeof(val32) * i, &val32, sizeof(val32));
                    197:                }
                    198:        } else
                    199:                memcpy(seed, seed0, 8);
                    200:
                    201:        /* copy the right-most 64-bits of the given address */
                    202:        /* XXX assumption on the size of IFID */
                    203:        memcpy(&seed[8], seed1, 8);
                    204:
                    205:   again:
                    206:        /* for debugging purposes only */
                    207: #if 0
                    208:        {
                    209:                int i;
                    210:
                    211:                printf("generate_tmp_ifid: new randomized ID from: ");
                    212:                for (i = 0; i < 16; i++)
                    213:                        printf("%02x", seed[i]);
                    214:                printf(" ");
                    215:        }
                    216: #endif
                    217:
                    218:        /* generate 16 bytes of pseudo-random value. */
                    219:        memset(&ctxt, 0, sizeof(ctxt));
                    220:        MD5Init(&ctxt);
                    221:        MD5Update(&ctxt, seed, sizeof(seed));
                    222:        MD5Final(digest, &ctxt);
                    223:
                    224:        /*
                    225:         * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (3)
                    226:         * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
                    227:         * left-most bit is numbered 0) to zero.
                    228:         */
                    229:        memcpy(ret, digest, 8);
                    230:        ret[0] &= ~EUI64_UBIT;
                    231:
                    232:        /*
                    233:         * Reject inappropriate identifiers according to
                    234:         * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4)
                    235:         * At this moment, we reject following cases:
                    236:         * - all 0 identifier
                    237:         * - identifiers that conflict with reserved subnet anycast addresses,
                    238:         *   which are defined in RFC 2526.
                    239:         * - identifiers that conflict with ISATAP addresses
                    240:         * - identifiers used in our own addresses
                    241:         */
                    242:        badid = 0;
                    243:        if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0)
                    244:                badid = 1;
                    245:        else if (memcmp(anycast_id, ret, 7) == 0 &&
                    246:            (anycast_id[7] & ret[7]) == anycast_id[7]) {
                    247:                badid = 1;
                    248:        } else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0)
                    249:                badid = 1;
                    250:        else {
                    251:                struct in6_ifaddr *ia;
                    252:
                    253:                for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
                    254:                        if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8],
                    255:                            ret, 8)) {
                    256:                                badid = 1;
                    257:                                break;
                    258:                        }
                    259:                }
                    260:        }
                    261:
                    262:        /*
                    263:         * In the event that an unacceptable identifier has been generated,
                    264:         * restart the process, using the right-most 64 bits of the MD5 digest
                    265:         * obtained in place of the history value.
                    266:         */
                    267:        if (badid) {
                    268:                /* for debugging purposes only */
                    269: #if 0
                    270:                {
                    271:                        int i;
                    272:
                    273:                        printf("unacceptable random ID: ");
                    274:                        for (i = 0; i < 16; i++)
                    275:                                printf("%02x", digest[i]);
                    276:                        printf("\n");
                    277:                }
                    278: #endif
                    279:
                    280:                if (++retry < GEN_TEMPID_RETRY_MAX) {
                    281:                        memcpy(seed, &digest[8], 8);
                    282:                        goto again;
                    283:                } else {
                    284:                        /*
                    285:                         * We're so unlucky.  Give up for now, and return
                    286:                         * all 0 IDs to tell the caller not to make a
                    287:                         * temporary address.
                    288:                         */
                    289:                        nd6log((LOG_NOTICE,
                    290:                            "generate_tmp_ifid: never found a good ID\n"));
                    291:                        memset(ret, 0, 8);
                    292:                }
                    293:        }
                    294:
                    295:        /*
                    296:         * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6)
                    297:         * Take the rightmost 64-bits of the MD5 digest and save them in
                    298:         * stable storage as the history value to be used in the next
                    299:         * iteration of the algorithm.
                    300:         */
                    301:        memcpy(seed0, &digest[8], 8);
                    302:
                    303:        /* for debugging purposes only */
                    304: #if 0
                    305:        {
                    306:                int i;
                    307:
                    308:                printf("to: ");
                    309:                for (i = 0; i < 16; i++)
                    310:                        printf("%02x", digest[i]);
                    311:                printf("\n");
                    312:        }
                    313: #endif
                    314:
                    315:        return 0;
                    316: }
1.25      itojun    317: /*
                    318:  * Get interface identifier for the specified interface.
1.71      christos  319:  * XXX assumes single sockaddr_dl (AF_LINK address) per an interfacea
                    320:  *
                    321:  * in6 - upper 64bits are preserved
1.25      itojun    322:  */
1.64      rpaulo    323: int
1.71      christos  324: in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
1.2       itojun    325: {
1.25      itojun    326:        struct ifaddr *ifa;
1.73      dyoung    327:        const struct sockaddr_dl *sdl;
                    328:        const char *addr;
1.25      itojun    329:        size_t addrlen;
                    330:        static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
                    331:        static u_int8_t allone[8] =
                    332:                { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
                    333:
1.76      dyoung    334:        IFADDR_FOREACH(ifa, ifp) {
1.25      itojun    335:                if (ifa->ifa_addr->sa_family != AF_LINK)
                    336:                        continue;
1.73      dyoung    337:                sdl = satocsdl(ifa->ifa_addr);
1.25      itojun    338:                if (sdl == NULL)
                    339:                        continue;
                    340:                if (sdl->sdl_alen == 0)
                    341:                        continue;
                    342:
                    343:                goto found;
                    344:        }
                    345:
                    346:        return -1;
                    347:
                    348: found:
1.73      dyoung    349:        addr = CLLADDR(sdl);
1.25      itojun    350:        addrlen = sdl->sdl_alen;
                    351:
1.48      itojun    352:        switch (ifp->if_type) {
                    353:        case IFT_IEEE1394:
                    354:        case IFT_IEEE80211:
                    355:                /* IEEE1394 uses 16byte length address starting with EUI64 */
                    356:                if (addrlen > 8)
                    357:                        addrlen = 8;
                    358:                break;
                    359:        default:
                    360:                break;
                    361:        }
                    362:
1.25      itojun    363:        /* get EUI64 */
                    364:        switch (ifp->if_type) {
1.48      itojun    365:        /* IEEE802/EUI64 cases - what others? */
1.25      itojun    366:        case IFT_ETHER:
                    367:        case IFT_FDDI:
                    368:        case IFT_ATM:
1.32      onoe      369:        case IFT_IEEE1394:
1.48      itojun    370:        case IFT_IEEE80211:
1.25      itojun    371:                /* look at IEEE802/EUI64 only */
                    372:                if (addrlen != 8 && addrlen != 6)
                    373:                        return -1;
1.13      itojun    374:
1.25      itojun    375:                /*
                    376:                 * check for invalid MAC address - on bsdi, we see it a lot
                    377:                 * since wildboar configures all-zero MAC on pccard before
                    378:                 * card insertion.
                    379:                 */
1.64      rpaulo    380:                if (memcmp(addr, allzero, addrlen) == 0)
1.25      itojun    381:                        return -1;
1.64      rpaulo    382:                if (memcmp(addr, allone, addrlen) == 0)
1.25      itojun    383:                        return -1;
                    384:
                    385:                /* make EUI64 address */
                    386:                if (addrlen == 8)
1.64      rpaulo    387:                        memcpy(&in6->s6_addr[8], addr, 8);
1.25      itojun    388:                else if (addrlen == 6) {
                    389:                        in6->s6_addr[8] = addr[0];
                    390:                        in6->s6_addr[9] = addr[1];
                    391:                        in6->s6_addr[10] = addr[2];
                    392:                        in6->s6_addr[11] = 0xff;
1.26      itojun    393:                        in6->s6_addr[12] = 0xfe;
1.25      itojun    394:                        in6->s6_addr[13] = addr[3];
                    395:                        in6->s6_addr[14] = addr[4];
                    396:                        in6->s6_addr[15] = addr[5];
                    397:                }
1.7       itojun    398:                break;
1.25      itojun    399:
                    400:        case IFT_ARCNET:
                    401:                if (addrlen != 1)
                    402:                        return -1;
                    403:                if (!addr[0])
                    404:                        return -1;
                    405:
1.64      rpaulo    406:                memset(&in6->s6_addr[8], 0, 8);
1.25      itojun    407:                in6->s6_addr[15] = addr[0];
                    408:
1.27      itojun    409:                /*
                    410:                 * due to insufficient bitwidth, we mark it local.
                    411:                 */
1.25      itojun    412:                in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
                    413:                in6->s6_addr[8] |= EUI64_UBIT;  /* u bit to "local" */
1.7       itojun    414:                break;
1.25      itojun    415:
                    416:        case IFT_GIF:
                    417: #ifdef IFT_STF
                    418:        case IFT_STF:
                    419: #endif
                    420:                /*
1.34      itojun    421:                 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
1.27      itojun    422:                 * however, IPv4 address is not very suitable as unique
                    423:                 * identifier source (can be renumbered).
                    424:                 * we don't do this.
1.25      itojun    425:                 */
                    426:                return -1;
                    427:
1.7       itojun    428:        default:
1.25      itojun    429:                return -1;
                    430:        }
                    431:
                    432:        /* sanity check: g bit must not indicate "group" */
                    433:        if (EUI64_GROUP(in6))
                    434:                return -1;
                    435:
                    436:        /* convert EUI64 into IPv6 interface identifier */
                    437:        EUI64_TO_IFID(in6);
                    438:
                    439:        /*
                    440:         * sanity check: ifid must not be all zero, avoid conflict with
                    441:         * subnet router anycast
                    442:         */
                    443:        if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
1.64      rpaulo    444:            memcmp(&in6->s6_addr[9], allzero, 7) == 0) {
1.25      itojun    445:                return -1;
1.7       itojun    446:        }
                    447:
                    448:        return 0;
1.2       itojun    449: }
                    450:
                    451: /*
1.25      itojun    452:  * Get interface identifier for the specified interface.  If it is not
                    453:  * available on ifp0, borrow interface identifier from other information
                    454:  * sources.
1.71      christos  455:  *
                    456:  * altifp - secondary EUI64 source
1.13      itojun    457:  */
                    458: static int
1.71      christos  459: get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
                    460:        struct in6_addr *in6)
1.13      itojun    461: {
1.25      itojun    462:        struct ifnet *ifp;
                    463:
                    464:        /* first, try to get it from the interface itself */
1.64      rpaulo    465:        if (in6_get_hw_ifid(ifp0, in6) == 0) {
1.34      itojun    466:                nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
                    467:                    if_name(ifp0)));
1.25      itojun    468:                goto success;
                    469:        }
                    470:
                    471:        /* try secondary EUI64 source. this basically is for ATM PVC */
1.64      rpaulo    472:        if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
1.34      itojun    473:                nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
                    474:                    if_name(ifp0), if_name(altifp)));
1.25      itojun    475:                goto success;
                    476:        }
                    477:
                    478:        /* next, try to get it from some other hardware interface */
1.68      dyoung    479:        TAILQ_FOREACH(ifp, &ifnet, if_list) {
1.25      itojun    480:                if (ifp == ifp0)
                    481:                        continue;
1.64      rpaulo    482:                if (in6_get_hw_ifid(ifp, in6) != 0)
1.25      itojun    483:                        continue;
1.27      itojun    484:
1.25      itojun    485:                /*
                    486:                 * to borrow ifid from other interface, ifid needs to be
                    487:                 * globally unique
                    488:                 */
                    489:                if (IFID_UNIVERSAL(in6)) {
1.34      itojun    490:                        nd6log((LOG_DEBUG,
                    491:                            "%s: borrow interface identifier from %s\n",
                    492:                            if_name(ifp0), if_name(ifp)));
1.25      itojun    493:                        goto success;
                    494:                }
                    495:        }
1.13      itojun    496:
1.64      rpaulo    497: #if 0
                    498:        /* get from hostid - only for certain architectures */
                    499:        if (get_hostid_ifid(ifp, in6) == 0) {
                    500:                nd6log((LOG_DEBUG,
                    501:                    "%s: interface identifier generated by hostid\n",
                    502:                    if_name(ifp0)));
                    503:                goto success;
                    504:        }
                    505: #endif
                    506:
1.25      itojun    507:        /* last resort: get from random number source */
                    508:        if (get_rand_ifid(ifp, in6) == 0) {
1.34      itojun    509:                nd6log((LOG_DEBUG,
                    510:                    "%s: interface identifier generated by random number\n",
                    511:                    if_name(ifp0)));
1.25      itojun    512:                goto success;
                    513:        }
1.13      itojun    514:
1.31      itojun    515:        printf("%s: failed to get interface identifier\n", if_name(ifp0));
1.25      itojun    516:        return -1;
1.13      itojun    517:
1.25      itojun    518: success:
1.47      itojun    519:        nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
                    520:            if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
                    521:            in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
                    522:            in6->s6_addr[14], in6->s6_addr[15]));
1.13      itojun    523:        return 0;
                    524: }
                    525:
1.71      christos  526: /*
                    527:  * altifp - secondary EUI64 source
                    528:  */
                    529:
1.25      itojun    530: static int
1.71      christos  531: in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
1.48      itojun    532: {
1.25      itojun    533:        struct in6_ifaddr *ia;
1.48      itojun    534:        struct in6_aliasreq ifra;
1.64      rpaulo    535:        struct nd_prefixctl pr0;
1.48      itojun    536:        int i, error;
1.25      itojun    537:
                    538:        /*
1.48      itojun    539:         * configure link-local address.
1.25      itojun    540:         */
1.64      rpaulo    541:        memset(&ifra, 0, sizeof(ifra));
1.2       itojun    542:
1.25      itojun    543:        /*
1.48      itojun    544:         * in6_update_ifa() does not use ifra_name, but we accurately set it
                    545:         * for safety.
1.25      itojun    546:         */
1.48      itojun    547:        strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1.2       itojun    548:
1.48      itojun    549:        ifra.ifra_addr.sin6_family = AF_INET6;
                    550:        ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1.63      rpaulo    551:        ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
1.48      itojun    552:        ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
                    553:        if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
                    554:                ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
                    555:                ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
                    556:        } else {
                    557:                if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
                    558:                        nd6log((LOG_ERR,
                    559:                            "%s: no ifid available\n", if_name(ifp)));
1.69      dyoung    560:                        return -1;
1.25      itojun    561:                }
                    562:        }
1.63      rpaulo    563:        if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
1.69      dyoung    564:                return -1;
1.25      itojun    565:
1.75      dyoung    566:        sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask64, 0, 0, 0);
1.48      itojun    567:        /* link-local addresses should NEVER expire. */
                    568:        ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
                    569:        ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
1.25      itojun    570:
1.48      itojun    571:        /*
                    572:         * Now call in6_update_ifa() to do a bunch of procedures to configure
1.70      dyoung    573:         * a link-local address. We can set the 3rd argument to NULL, because
1.48      itojun    574:         * we know there's no other link-local address on the interface
                    575:         * and therefore we are adding one (instead of updating one).
                    576:         */
1.64      rpaulo    577:        if ((error = in6_update_ifa(ifp, &ifra, NULL,
                    578:            IN6_IFAUPDATE_DADDELAY)) != 0) {
1.25      itojun    579:                /*
1.48      itojun    580:                 * XXX: When the interface does not support IPv6, this call
                    581:                 * would fail in the SIOCSIFADDR ioctl.  I believe the
                    582:                 * notification is rather confusing in this case, so just
                    583:                 * suppress it.  (jinmei@kame.net 20010130)
1.25      itojun    584:                 */
1.48      itojun    585:                if (error != EAFNOSUPPORT)
1.49      itojun    586:                        nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
1.48      itojun    587:                            "configure a link-local address on %s "
                    588:                            "(errno=%d)\n",
1.49      itojun    589:                            if_name(ifp), error));
1.69      dyoung    590:                return -1;
1.25      itojun    591:        }
                    592:
1.48      itojun    593:        ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
                    594: #ifdef DIAGNOSTIC
                    595:        if (!ia) {
                    596:                panic("ia == NULL in in6_ifattach_linklocal");
                    597:                /* NOTREACHED */
                    598:        }
                    599: #endif
1.25      itojun    600:
1.48      itojun    601:        /*
                    602:         * Make the link-local prefix (fe80::/64%link) as on-link.
                    603:         * Since we'd like to manage prefixes separately from addresses,
                    604:         * we make an ND6 prefix structure for the link-local prefix,
                    605:         * and add it to the prefix list as a never-expire prefix.
                    606:         * XXX: this change might affect some existing code base...
                    607:         */
1.64      rpaulo    608:        memset(&pr0, 0, sizeof(pr0));
1.48      itojun    609:        pr0.ndpr_ifp = ifp;
                    610:        /* this should be 64 at this moment. */
                    611:        pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
                    612:        pr0.ndpr_prefix = ifra.ifra_addr;
                    613:        /* apply the mask for safety. (nd6_prelist_add will apply it again) */
                    614:        for (i = 0; i < 4; i++) {
                    615:                pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
                    616:                    in6mask64.s6_addr32[i];
                    617:        }
                    618:        /*
                    619:         * Initialize parameters.  The link-local prefix must always be
                    620:         * on-link, and its lifetimes never expire.
                    621:         */
                    622:        pr0.ndpr_raf_onlink = 1;
                    623:        pr0.ndpr_raf_auto = 1;  /* probably meaningless */
                    624:        pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
                    625:        pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
                    626:        /*
                    627:         * Since there is no other link-local addresses, nd6_prefix_lookup()
                    628:         * probably returns NULL.  However, we cannot always expect the result.
                    629:         * For example, if we first remove the (only) existing link-local
                    630:         * address, and then reconfigure another one, the prefix is still
                    631:         * valid with referring to the old link-local address.
                    632:         */
                    633:        if (nd6_prefix_lookup(&pr0) == NULL) {
                    634:                if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
1.69      dyoung    635:                        return error;
1.25      itojun    636:        }
                    637:
                    638:        return 0;
                    639: }
                    640:
1.71      christos  641: /*
                    642:  * ifp - mut be IFT_LOOP
                    643:  */
                    644:
1.25      itojun    645: static int
1.71      christos  646: in6_ifattach_loopback(struct ifnet *ifp)
1.25      itojun    647: {
1.48      itojun    648:        struct in6_aliasreq ifra;
                    649:        int error;
                    650:
1.64      rpaulo    651:        memset(&ifra, 0, sizeof(ifra));
1.25      itojun    652:
                    653:        /*
1.48      itojun    654:         * in6_update_ifa() does not use ifra_name, but we accurately set it
                    655:         * for safety.
1.25      itojun    656:         */
1.48      itojun    657:        strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
                    658:
1.75      dyoung    659:        sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask128, 0, 0, 0);
1.25      itojun    660:
                    661:        /*
                    662:         * Always initialize ia_dstaddr (= broadcast address) to loopback
1.48      itojun    663:         * address.  Follows IPv4 practice - see in_ifinit().
                    664:         */
1.75      dyoung    665:        sockaddr_in6_init(&ifra.ifra_dstaddr, &in6addr_loopback, 0, 0, 0);
1.48      itojun    666:
1.75      dyoung    667:        sockaddr_in6_init(&ifra.ifra_addr, &in6addr_loopback, 0, 0, 0);
1.48      itojun    668:
                    669:        /* the loopback  address should NEVER expire. */
                    670:        ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
                    671:        ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
                    672:
                    673:        /* we don't need to perform DAD on loopback interfaces. */
                    674:        ifra.ifra_flags |= IN6_IFF_NODAD;
                    675:
                    676:        /*
                    677:         * We are sure that this is a newly assigned address, so we can set
                    678:         * NULL to the 3rd arg.
                    679:         */
1.64      rpaulo    680:        if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
1.49      itojun    681:                nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
1.48      itojun    682:                    "the loopback address on %s (errno=%d)\n",
1.49      itojun    683:                    if_name(ifp), error));
1.69      dyoung    684:                return -1;
1.48      itojun    685:        }
1.25      itojun    686:
1.48      itojun    687:        return 0;
                    688: }
                    689:
                    690: /*
                    691:  * compute NI group address, based on the current hostname setting.
                    692:  * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
                    693:  *
                    694:  * when ifp == NULL, the caller is responsible for filling scopeid.
                    695:  */
                    696: int
1.71      christos  697: in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
                    698:        struct sockaddr_in6 *sa6)
1.48      itojun    699: {
                    700:        const char *p;
1.52      itojun    701:        u_int8_t *q;
1.48      itojun    702:        MD5_CTX ctxt;
                    703:        u_int8_t digest[16];
1.50      itojun    704:        u_int8_t l;
                    705:        u_int8_t n[64]; /* a single label must not exceed 63 chars */
1.25      itojun    706:
1.48      itojun    707:        if (!namelen || !name)
1.25      itojun    708:                return -1;
1.48      itojun    709:
                    710:        p = name;
                    711:        while (p && *p && *p != '.' && p - name < namelen)
                    712:                p++;
                    713:        if (p - name > sizeof(n) - 1)
                    714:                return -1;      /* label too long */
                    715:        l = p - name;
1.50      itojun    716:        strncpy((char *)n, name, l);
1.48      itojun    717:        n[(int)l] = '\0';
                    718:        for (q = n; *q; q++) {
                    719:                if ('A' <= *q && *q <= 'Z')
                    720:                        *q = *q - 'A' + 'a';
1.2       itojun    721:        }
1.25      itojun    722:
1.48      itojun    723:        /* generate 8 bytes of pseudo-random value. */
1.64      rpaulo    724:        memset(&ctxt, 0, sizeof(ctxt));
1.48      itojun    725:        MD5Init(&ctxt);
                    726:        MD5Update(&ctxt, &l, sizeof(l));
                    727:        MD5Update(&ctxt, n, l);
                    728:        MD5Final(digest, &ctxt);
                    729:
1.64      rpaulo    730:        memset(sa6, 0, sizeof(*sa6));
1.48      itojun    731:        sa6->sin6_family = AF_INET6;
                    732:        sa6->sin6_len = sizeof(*sa6);
                    733:        sa6->sin6_addr.s6_addr16[0] = htons(0xff02);
                    734:        sa6->sin6_addr.s6_addr8[11] = 2;
1.64      rpaulo    735:        memcpy(&sa6->sin6_addr.s6_addr32[3], digest,
1.48      itojun    736:            sizeof(sa6->sin6_addr.s6_addr32[3]));
1.63      rpaulo    737:        if (in6_setscope(&sa6->sin6_addr, ifp, NULL))
1.69      dyoung    738:                return -1; /* XXX: should not fail */
1.48      itojun    739:
1.25      itojun    740:        return 0;
1.2       itojun    741: }
                    742:
1.17      itojun    743: /*
                    744:  * XXX multiple loopback interface needs more care.  for instance,
                    745:  * nodelocal address needs to be configured onto only one of them.
1.25      itojun    746:  * XXX multiple link-local address case
1.71      christos  747:  *
                    748:  * altifp - secondary EUI64 source
1.17      itojun    749:  */
1.2       itojun    750: void
1.71      christos  751: in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
1.2       itojun    752: {
1.25      itojun    753:        struct in6_ifaddr *ia;
                    754:        struct in6_addr in6;
1.13      itojun    755:
1.38      itojun    756:        /* some of the interfaces are inherently not IPv6 capable */
                    757:        switch (ifp->if_type) {
1.42      itojun    758:        case IFT_BRIDGE:
1.59      christos  759: #ifdef IFT_PFLOG
1.58      itojun    760:        case IFT_PFLOG:
1.59      christos  761: #endif
                    762: #ifdef IFT_PFSYNC
1.58      itojun    763:        case IFT_PFSYNC:
1.59      christos  764: #endif
1.42      itojun    765:                return;
1.38      itojun    766:        }
                    767:
1.46      itojun    768:        /*
                    769:         * if link mtu is too small, don't try to configure IPv6.
                    770:         * remember there could be some link-layer that has special
                    771:         * fragmentation logic.
                    772:         */
1.49      itojun    773:        if (ifp->if_mtu < IPV6_MMTU) {
                    774:                nd6log((LOG_INFO, "in6_ifattach: "
                    775:                    "%s has too small MTU, IPv6 not enabled\n",
                    776:                    if_name(ifp)));
1.46      itojun    777:                return;
1.49      itojun    778:        }
1.46      itojun    779:
1.37      itojun    780:        /* create a multicast kludge storage (if we have not had one) */
                    781:        in6_createmkludge(ifp);
1.2       itojun    782:
                    783:        /*
1.25      itojun    784:         * quirks based on interface type
1.2       itojun    785:         */
1.25      itojun    786:        switch (ifp->if_type) {
                    787: #ifdef IFT_STF
                    788:        case IFT_STF:
                    789:                /*
1.38      itojun    790:                 * 6to4 interface is a very special kind of beast.
                    791:                 * no multicast, no linklocal.  RFC2529 specifies how to make
                    792:                 * linklocals for 6to4 interface, but there's no use and
                    793:                 * it is rather harmful to have one.
1.25      itojun    794:                 */
1.46      itojun    795:                return;
1.25      itojun    796: #endif
1.65      liamjfoy  797:        case IFT_CARP:
                    798:                return;
1.25      itojun    799:        default:
                    800:                break;
1.7       itojun    801:        }
1.2       itojun    802:
                    803:        /*
1.25      itojun    804:         * usually, we require multicast capability to the interface
1.2       itojun    805:         */
1.25      itojun    806:        if ((ifp->if_flags & IFF_MULTICAST) == 0) {
1.49      itojun    807:                nd6log((LOG_INFO, "in6_ifattach: "
1.38      itojun    808:                    "%s is not multicast capable, IPv6 not enabled\n",
1.49      itojun    809:                    if_name(ifp)));
1.25      itojun    810:                return;
                    811:        }
1.15      thorpej   812:
1.2       itojun    813:        /*
1.48      itojun    814:         * assign loopback address for loopback interface.
                    815:         * XXX multiple loopback interface case.
1.2       itojun    816:         */
1.48      itojun    817:        if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
                    818:                in6 = in6addr_loopback;
1.25      itojun    819:                if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
                    820:                        if (in6_ifattach_loopback(ifp) != 0)
                    821:                                return;
                    822:                }
                    823:        }
1.2       itojun    824:
                    825:        /*
1.48      itojun    826:         * assign a link-local address, if there's none.
1.2       itojun    827:         */
1.48      itojun    828:        if (ip6_auto_linklocal) {
                    829:                ia = in6ifa_ifpforlinklocal(ifp, 0);
1.70      dyoung    830:                if (ia == NULL && in6_ifattach_linklocal(ifp, altifp) != 0) {
                    831:                        printf("%s: cannot assign link-local address\n",
                    832:                            ifp->if_xname);
1.2       itojun    833:                }
                    834:        }
                    835: }
                    836:
1.17      itojun    837: /*
                    838:  * NOTE: in6_ifdetach() does not support loopback if at this moment.
1.41      itojun    839:  * We don't need this function in bsdi, because interfaces are never removed
                    840:  * from the ifnet list in bsdi.
1.17      itojun    841:  */
1.2       itojun    842: void
1.71      christos  843: in6_ifdetach(struct ifnet *ifp)
1.2       itojun    844: {
                    845:        struct in6_ifaddr *ia, *oia;
1.30      itojun    846:        struct ifaddr *ifa, *next;
1.2       itojun    847:        struct rtentry *rt;
                    848:        short rtflags;
1.48      itojun    849:        struct in6_multi_mship *imm;
1.55      itojun    850:
                    851:        /* remove ip6_mrouter stuff */
                    852:        ip6_mrouter_detach(ifp);
1.18      itojun    853:
                    854:        /* remove neighbor management table */
                    855:        nd6_purge(ifp);
                    856:
1.76      dyoung    857:        /* XXX this code is duplicated in in6_purgeif() --dyoung */
1.30      itojun    858:        /* nuke any of IPv6 addresses we have */
1.78      dyoung    859:        if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr);
1.30      itojun    860:
1.76      dyoung    861:        /* XXX isn't this code is redundant, given the above? --dyoung */
                    862:        /* XXX doesn't this code replicate code in in6_purgeaddr() ? --dyoung */
1.30      itojun    863:        /* undo everything done by in6_ifattach(), just in case */
1.77      dyoung    864:        for (ifa = IFADDR_FIRST(ifp); ifa != NULL; ifa = next) {
                    865:                next = IFADDR_NEXT(ifa);
1.30      itojun    866:
1.2       itojun    867:                if (ifa->ifa_addr->sa_family != AF_INET6
                    868:                 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
                    869:                        continue;
                    870:                }
                    871:
                    872:                ia = (struct in6_ifaddr *)ifa;
                    873:
1.48      itojun    874:                /*
                    875:                 * leave from multicast groups we have joined for the interface
                    876:                 */
1.68      dyoung    877:                while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1.48      itojun    878:                        LIST_REMOVE(imm, i6mm_chain);
                    879:                        in6_leavegroup(imm);
                    880:                }
                    881:
1.2       itojun    882:                /* remove from the routing table */
1.48      itojun    883:                if ((ia->ia_flags & IFA_ROUTE) &&
                    884:                    (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) {
1.2       itojun    885:                        rtflags = rt->rt_flags;
                    886:                        rtfree(rt);
1.47      itojun    887:                        rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
                    888:                            (struct sockaddr *)&ia->ia_addr,
                    889:                            (struct sockaddr *)&ia->ia_prefixmask,
                    890:                            rtflags, (struct rtentry **)0);
1.2       itojun    891:                }
                    892:
                    893:                /* remove from the linked list */
1.79    ! dyoung    894:                ifa_remove(ifp, &ia->ia_ifa);
1.2       itojun    895:
                    896:                /* also remove from the IPv6 address chain(itojun&jinmei) */
                    897:                oia = ia;
                    898:                if (oia == (ia = in6_ifaddr))
                    899:                        in6_ifaddr = ia->ia_next;
                    900:                else {
                    901:                        while (ia->ia_next && (ia->ia_next != oia))
                    902:                                ia = ia->ia_next;
                    903:                        if (ia->ia_next)
                    904:                                ia->ia_next = oia->ia_next;
1.34      itojun    905:                        else {
1.48      itojun    906:                                nd6log((LOG_ERR,
1.47      itojun    907:                                    "%s: didn't unlink in6ifaddr from list\n",
                    908:                                    if_name(ifp)));
1.34      itojun    909:                        }
1.2       itojun    910:                }
                    911:
1.30      itojun    912:                IFAFREE(&oia->ia_ifa);
1.16      itojun    913:        }
                    914:
1.17      itojun    915:        /* cleanup multicast address kludge table, if there is any */
                    916:        in6_purgemkludge(ifp);
1.30      itojun    917:
1.41      itojun    918:        /*
                    919:         * remove neighbor management table.  we call it twice just to make
                    920:         * sure we nuke everything.  maybe we need just one call.
                    921:         * XXX: since the first call did not release addresses, some prefixes
                    922:         * might remain.  We should call nd6_purge() again to release the
                    923:         * prefixes after removing all addresses above.
                    924:         * (Or can we just delay calling nd6_purge until at this point?)
                    925:         */
1.30      itojun    926:        nd6_purge(ifp);
1.2       itojun    927: }
1.64      rpaulo    928:
                    929: int
1.71      christos  930: in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
                    931:        const u_int8_t *baseid, int generate)
1.64      rpaulo    932: {
                    933:        u_int8_t nullbuf[8];
                    934:        struct nd_ifinfo *ndi = ND_IFINFO(ifp);
                    935:
                    936:        memset(nullbuf, 0, sizeof(nullbuf));
                    937:        if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
                    938:                /* we've never created a random ID.  Create a new one. */
                    939:                generate = 1;
                    940:        }
                    941:
                    942:        if (generate) {
                    943:                memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1));
                    944:
                    945:                /* generate_tmp_ifid will update seedn and buf */
                    946:                (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
                    947:                    ndi->randomid);
                    948:        }
                    949:        memcpy(retbuf, ndi->randomid, 8);
                    950:        if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) {
                    951:                /* generate_tmp_ifid could not found a good ID. */
1.69      dyoung    952:                return -1;
1.64      rpaulo    953:        }
                    954:
1.69      dyoung    955:        return 0;
1.64      rpaulo    956: }
                    957:
                    958: void
1.67      christos  959: in6_tmpaddrtimer(void *ignored_arg)
1.64      rpaulo    960: {
                    961:        struct nd_ifinfo *ndi;
                    962:        u_int8_t nullbuf[8];
                    963:        struct ifnet *ifp;
                    964:        int s = splsoftnet();
                    965:
                    966:        callout_reset(&in6_tmpaddrtimer_ch,
                    967:            (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    968:            ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL);
                    969:
                    970:        memset(nullbuf, 0, sizeof(nullbuf));
1.69      dyoung    971:        TAILQ_FOREACH(ifp, &ifnet, if_list) {
1.64      rpaulo    972:                ndi = ND_IFINFO(ifp);
                    973:                if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
                    974:                        /*
                    975:                         * We've been generating a random ID on this interface.
                    976:                         * Create a new one.
                    977:                         */
                    978:                        (void)generate_tmp_ifid(ndi->randomseed0,
                    979:                            ndi->randomseed1, ndi->randomid);
                    980:                }
                    981:        }
                    982:
                    983:        splx(s);
                    984: }

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