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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.2

1.2     ! itojun      1: /*
        !             2:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the project nor the names of its contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: /*
        !            31:  * Copyright (c) 1982, 1986, 1988, 1993
        !            32:  *     The Regents of the University of California.  All rights reserved.
        !            33:  *
        !            34:  * Redistribution and use in source and binary forms, with or without
        !            35:  * modification, are permitted provided that the following conditions
        !            36:  * are met:
        !            37:  * 1. Redistributions of source code must retain the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer.
        !            39:  * 2. Redistributions in binary form must reproduce the above copyright
        !            40:  *    notice, this list of conditions and the following disclaimer in the
        !            41:  *    documentation and/or other materials provided with the distribution.
        !            42:  * 3. All advertising materials mentioning features or use of this software
        !            43:  *    must display the following acknowledgement:
        !            44:  *     This product includes software developed by the University of
        !            45:  *     California, Berkeley and its contributors.
        !            46:  * 4. Neither the name of the University nor the names of its contributors
        !            47:  *    may be used to endorse or promote products derived from this software
        !            48:  *    without specific prior written permission.
        !            49:  *
        !            50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            60:  * SUCH DAMAGE.
        !            61:  *
        !            62:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
        !            63:  */
        !            64:
        !            65: #ifdef __FreeBSD__
        !            66: #include "opt_ip6fw.h"
        !            67: #endif
        !            68: #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
        !            69: #include "opt_inet.h"
        !            70: #endif
        !            71:
        !            72: #include <sys/param.h>
        !            73: #include <sys/systm.h>
        !            74: #include <sys/malloc.h>
        !            75: #include <sys/mbuf.h>
        !            76: #include <sys/domain.h>
        !            77: #include <sys/protosw.h>
        !            78: #include <sys/socket.h>
        !            79: #include <sys/socketvar.h>
        !            80: #include <sys/errno.h>
        !            81: #include <sys/time.h>
        !            82: #include <sys/kernel.h>
        !            83: #include <sys/syslog.h>
        !            84: #ifdef __NetBSD__
        !            85: #include <sys/proc.h>
        !            86: #endif
        !            87:
        !            88: #include <net/if.h>
        !            89: #include <net/if_types.h>
        !            90: #include <net/if_dl.h>
        !            91: #include <net/route.h>
        !            92: #include <net/netisr.h>
        !            93:
        !            94: #include <netinet/in.h>
        !            95: #include <netinet6/in6_var.h>
        !            96: #include <netinet/in_systm.h>
        !            97: #include <netinet6/ip6.h>
        !            98: #if !defined(__FreeBSD__) || __FreeBSD__ < 3
        !            99: #include <netinet6/in6_pcb.h>
        !           100: #else
        !           101: #include <netinet/in_pcb.h>
        !           102: #endif
        !           103: #include <netinet6/ip6_var.h>
        !           104: #include <netinet6/icmp6.h>
        !           105: #include <netinet6/in6_ifattach.h>
        !           106: #include <netinet6/nd6.h>
        !           107:
        !           108: #ifdef INET
        !           109: #include <netinet/ip.h>
        !           110: #include <netinet/ip_icmp.h>
        !           111: #endif /*INET*/
        !           112:
        !           113: #include <netinet6/ip6protosw.h>
        !           114:
        !           115: /* we need it for NLOOP. */
        !           116: #include "loop.h"
        !           117: #include "faith.h"
        !           118:
        !           119: #include "gif.h"
        !           120: #include "bpfilter.h"
        !           121:
        !           122: extern struct domain inet6domain;
        !           123: extern struct ip6protosw inet6sw[];
        !           124: #ifdef __bsdi__
        !           125: extern struct ifnet loif;
        !           126: #endif
        !           127:
        !           128: u_char ip6_protox[IPPROTO_MAX];
        !           129: static int ip6qmaxlen = IFQ_MAXLEN;
        !           130: struct in6_ifaddr *in6_ifaddr;
        !           131: struct ifqueue ip6intrq;
        !           132:
        !           133: #ifdef __NetBSD__
        !           134: extern struct ifnet loif[NLOOP];
        !           135: int ip6_forward_srcrt;                 /* XXX */
        !           136: int ip6_sourcecheck;                   /* XXX */
        !           137: int ip6_sourcecheck_interval;          /* XXX */
        !           138: #endif
        !           139:
        !           140: struct ip6stat ip6stat;
        !           141:
        !           142: static void ip6_init2 __P((void *));
        !           143:
        !           144: static int ip6_hopopts_input __P((u_int32_t *, long *, struct mbuf **, int *));
        !           145:
        !           146: /*
        !           147:  * IP6 initialization: fill in IP6 protocol switch table.
        !           148:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
        !           149:  */
        !           150: void
        !           151: ip6_init()
        !           152: {
        !           153:        register struct ip6protosw *pr;
        !           154:        register int i;
        !           155:        struct timeval tv;
        !           156:
        !           157:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
        !           158:        if (pr == 0)
        !           159:                panic("ip6_init");
        !           160:        for (i = 0; i < IPPROTO_MAX; i++)
        !           161:                ip6_protox[i] = pr - inet6sw;
        !           162:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
        !           163:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
        !           164:                if (pr->pr_domain->dom_family == PF_INET6 &&
        !           165:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
        !           166:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
        !           167:        ip6intrq.ifq_maxlen = ip6qmaxlen;
        !           168:        nd6_init();
        !           169:        frag6_init();
        !           170:        /*
        !           171:         * in many cases, random() here does NOT return random number
        !           172:         * as initialization during bootstrap time occur in fixed order.
        !           173:         */
        !           174:        microtime(&tv);
        !           175:        ip6_flow_seq = random() ^ tv.tv_usec;
        !           176:        in6_iflladdr = malloc(i, M_IFADDR, M_WAITOK);
        !           177:        bzero(in6_iflladdr, i);
        !           178:
        !           179:        ip6_init2((void *)0);
        !           180: }
        !           181:
        !           182: static void
        !           183: ip6_init2(dummy)
        !           184:        void *dummy;
        !           185: {
        !           186:        int i;
        !           187:
        !           188:        /*
        !           189:         * to route local address of p2p link to loopback,
        !           190:         * assign loopback address first.
        !           191:         */
        !           192:        for (i = 0; i < NLOOP; i++)
        !           193:                in6_ifattach(&loif[i], IN6_IFT_LOOP, NULL, 0);
        !           194:
        !           195:        /* get EUI64 from somewhere, attach pseudo interfaces */
        !           196:        if (in6_ifattach_getifid(NULL) == 0)
        !           197:                in6_ifattach_p2p();
        !           198:
        !           199:        /* nd6_timer_init */
        !           200:        timeout(nd6_timer, (caddr_t)0, hz);
        !           201: }
        !           202:
        !           203: #ifdef __FreeBSD__
        !           204: /* cheat */
        !           205: SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init2, NULL);
        !           206: #endif
        !           207:
        !           208: /*
        !           209:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
        !           210:  */
        !           211: void
        !           212: ip6intr()
        !           213: {
        !           214:        int s;
        !           215:        struct mbuf *m;
        !           216:
        !           217:        for (;;) {
        !           218:                s = splimp();
        !           219:                IF_DEQUEUE(&ip6intrq, m);
        !           220:                splx(s);
        !           221:                if (m == 0)
        !           222:                        return;
        !           223:                ip6_input(m);
        !           224:        }
        !           225: }
        !           226:
        !           227: #ifdef __FreeBSD__
        !           228: NETISR_SET(NETISR_IPV6, ip6intr);
        !           229: #endif
        !           230:
        !           231: extern struct  route_in6 ip6_forward_rt;
        !           232:
        !           233: void
        !           234: ip6_input(m)
        !           235:        struct mbuf *m;
        !           236: {
        !           237:        register struct ip6_hdr *ip6;
        !           238:        int off = sizeof(struct ip6_hdr), nest;
        !           239:        u_int32_t plen;
        !           240:        long rtalert = -1;
        !           241:        int nxt, ours = 0;
        !           242:
        !           243: #ifdef IPSEC
        !           244:        /*
        !           245:         * should the inner packet be considered authentic?
        !           246:         * see comment in ah4_input().
        !           247:         */
        !           248:        if (m) {
        !           249:                m->m_flags &= ~M_AUTHIPHDR;
        !           250:                m->m_flags &= ~M_AUTHIPDGM;
        !           251:        }
        !           252: #endif
        !           253:        /*
        !           254:         * mbuf statistics by kazu
        !           255:         */
        !           256:        if (m->m_flags & M_EXT) {
        !           257:                if (m->m_next)
        !           258:                        ip6stat.ip6s_mext2m++;
        !           259:                else
        !           260:                        ip6stat.ip6s_mext1++;
        !           261:        } else {
        !           262:                if (m->m_next) {
        !           263:                        if (m->m_flags & M_LOOP)
        !           264:                                ip6stat.ip6s_m2m[loif[0].if_index]++;   /*XXX*/
        !           265:                        else if (m->m_pkthdr.rcvif->if_index <= 31)
        !           266:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
        !           267:                        else
        !           268:                                ip6stat.ip6s_m2m[0]++;
        !           269:                } else
        !           270:                        ip6stat.ip6s_m1++;
        !           271:        }
        !           272:
        !           273:        IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
        !           274:
        !           275:        ip6stat.ip6s_total++;
        !           276:
        !           277:        if (m->m_len < sizeof(struct ip6_hdr) &&
        !           278:            (m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
        !           279:                ip6stat.ip6s_toosmall++;
        !           280:                return;
        !           281:        }
        !           282:
        !           283:        ip6 = mtod(m, struct ip6_hdr *);
        !           284:
        !           285:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
        !           286:                ip6stat.ip6s_badvers++;
        !           287:                goto bad;
        !           288:        }
        !           289:
        !           290:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
        !           291:
        !           292:        /*
        !           293:         * Scope check
        !           294:         */
        !           295:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
        !           296:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
        !           297:                ip6stat.ip6s_badscope++;
        !           298:                goto bad;
        !           299:        }
        !           300:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
        !           301:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
        !           302:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
        !           303:                        ours = 1;
        !           304:                        goto hbhcheck;
        !           305:                } else {
        !           306:                        ip6stat.ip6s_badscope++;
        !           307:                        goto bad;
        !           308:                }
        !           309:        }
        !           310:
        !           311:        if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
        !           312:                if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
        !           313:                        ours = 1;
        !           314:                        goto hbhcheck;
        !           315:                }
        !           316:        } else {
        !           317:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
        !           318:                        ip6->ip6_src.s6_addr16[1]
        !           319:                                = htons(m->m_pkthdr.rcvif->if_index);
        !           320:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
        !           321:                        ip6->ip6_dst.s6_addr16[1]
        !           322:                                = htons(m->m_pkthdr.rcvif->if_index);
        !           323:        }
        !           324:
        !           325:        /*
        !           326:         * Multicast check
        !           327:         */
        !           328:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
        !           329:                struct  in6_multi *in6m = 0;
        !           330:                /*
        !           331:                 * See if we belong to the destination multicast group on the
        !           332:                 * arrival interface.
        !           333:                 */
        !           334:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
        !           335:                if (in6m)
        !           336:                        ours = 1;
        !           337:                else if (!ip6_mrouter) {
        !           338:                        ip6stat.ip6s_notmember++;
        !           339:                        ip6stat.ip6s_cantforward++;
        !           340:                        goto bad;
        !           341:                }
        !           342:                goto hbhcheck;
        !           343:        }
        !           344:
        !           345:        /*
        !           346:         *  Unicast check
        !           347:         */
        !           348:        if (ip6_forward_rt.ro_rt == 0 ||
        !           349:            !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
        !           350:                                &ip6_forward_rt.ro_dst.sin6_addr)) {
        !           351:                if (ip6_forward_rt.ro_rt) {
        !           352:                        RTFREE(ip6_forward_rt.ro_rt);
        !           353:                        ip6_forward_rt.ro_rt = 0;
        !           354:                }
        !           355:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
        !           356:                ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
        !           357:                ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
        !           358:                ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
        !           359:
        !           360: #if defined(__bsdi__) || defined(__NetBSD__)
        !           361:                rtalloc((struct route *)&ip6_forward_rt);
        !           362: #endif
        !           363: #ifdef __FreeBSD__
        !           364:                rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
        !           365: #endif
        !           366:        }
        !           367:
        !           368: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
        !           369:
        !           370:        /*
        !           371:         * Accept the packet if the forwarding interface to the destination
        !           372:         * according to the routing table is the loopback interface,
        !           373:         * unless the associated route has a gateway.
        !           374:         * Note that this approach causes to accept a packet if there is a
        !           375:         * route to the loopback interface for the destination of the packet.
        !           376:         * But we think it's even useful in some situations, e.g. when using
        !           377:         * a special daemon which wants to intercept the packet.
        !           378:         */
        !           379:        if (ip6_forward_rt.ro_rt &&
        !           380:            (ip6_forward_rt.ro_rt->rt_flags &
        !           381:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
        !           382: #if 0
        !           383:            /*
        !           384:             * The check below is redundant since the comparison of
        !           385:             * the destination and the key of the rtentry has
        !           386:             * already done through looking up the routing table.
        !           387:             */
        !           388:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
        !           389:                               &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
        !           390: #endif
        !           391: #ifdef __bsdi__
        !           392:            ip6_foward.rt.ro_rt->rt_ifp == &loif
        !           393: #else
        !           394:            ip6_forward_rt.ro_rt->rt_ifp == &loif[0]
        !           395: #endif
        !           396:                ) {
        !           397:                struct in6_ifaddr *ia6 =
        !           398:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
        !           399:                /* packet to tentative address must not be received */
        !           400:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
        !           401:                        m->m_flags |= M_ANYCAST6;
        !           402:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
        !           403:                        /* this interface is ready */
        !           404:                        ours = 1;
        !           405:                        goto hbhcheck;
        !           406:                } else {
        !           407:                        /* this interface is not ready, fall through */
        !           408:                }
        !           409:        }
        !           410:
        !           411:        /*
        !           412:         * FAITH(Firewall Aided Internet Translator)
        !           413:         */
        !           414: #if defined(NFAITH) && 0 < NFAITH
        !           415:        if (ip6_keepfaith) {
        !           416:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
        !           417:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
        !           418:                        /* XXX do we need more sanity checks? */
        !           419:                        ours = 1;
        !           420:                        goto hbhcheck;
        !           421:                }
        !           422:        }
        !           423: #endif
        !           424:
        !           425:        /*
        !           426:         * Now there is no reason to process the packet if it's not our own
        !           427:         * and we're not a router.
        !           428:         */
        !           429:        if (!ip6_forwarding) {
        !           430:                ip6stat.ip6s_cantforward++;
        !           431:                goto bad;
        !           432:        }
        !           433:
        !           434:   hbhcheck:
        !           435:        /*
        !           436:         * Process Hop-by-Hop options header if it's contained.
        !           437:         * m may be modified in ip6_hopopts_input().
        !           438:         * If a JumboPayload option is included, plen will also be modified.
        !           439:         */
        !           440:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
        !           441:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
        !           442:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off))
        !           443:                        return; /* m have already been freed */
        !           444:                /* adjust pointer */
        !           445:                ip6 = mtod(m, struct ip6_hdr *);
        !           446:                nxt = ((struct ip6_hbh *)(ip6 + 1))->ip6h_nxt;
        !           447:
        !           448:                /*
        !           449:                 * accept the packet if a router alert option is included
        !           450:                 * and we act as an IPv6 router.
        !           451:                 */
        !           452:                if (rtalert >= 0 && ip6_forwarding)
        !           453:                        ours = 1;
        !           454:        } else
        !           455:                nxt = ip6->ip6_nxt;
        !           456:
        !           457:        /*
        !           458:         * Check that the amount of data in the buffers
        !           459:         * is as at least much as the IPv6 header would have us expect.
        !           460:         * Trim mbufs if longer than we expect.
        !           461:         * Drop packet if shorter than we expect.
        !           462:         */
        !           463:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
        !           464:                ip6stat.ip6s_tooshort++;
        !           465:                goto bad;
        !           466:        }
        !           467:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
        !           468:                if (m->m_len == m->m_pkthdr.len) {
        !           469:                        m->m_len = sizeof(struct ip6_hdr) + plen;
        !           470:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
        !           471:                } else
        !           472:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
        !           473:        }
        !           474:
        !           475:        /*
        !           476:         * Forward if desirable.
        !           477:         */
        !           478:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
        !           479:                /*
        !           480:                 * If we are acting as a multicast router, all
        !           481:                 * incoming multicast packets are passed to the
        !           482:                 * kernel-level multicast forwarding function.
        !           483:                 * The packet is returned (relatively) intact; if
        !           484:                 * ip6_mforward() returns a non-zero value, the packet
        !           485:                 * must be discarded, else it may be accepted below.
        !           486:                 */
        !           487:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
        !           488:                        ip6stat.ip6s_cantforward++;
        !           489:                        m_freem(m);
        !           490:                        return;
        !           491:                }
        !           492:                if (!ours) {
        !           493:                        m_freem(m);
        !           494:                        return;
        !           495:                }
        !           496:        }
        !           497:        else if (!ours) {
        !           498:                ip6_forward(m, 0);
        !           499:                return;
        !           500:        }
        !           501:
        !           502:        /*
        !           503:         * Tell launch routine the next header
        !           504:         */
        !           505:        ip6stat.ip6s_delivered++;
        !           506:        nest = 0;
        !           507:        while (nxt != IPPROTO_DONE) {
        !           508:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
        !           509:                        ip6stat.ip6s_toomanyhdr++;
        !           510:                        goto bad;
        !           511:                }
        !           512:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
        !           513:        }
        !           514:        return;
        !           515:  bad:
        !           516:        m_freem(m);
        !           517: }
        !           518:
        !           519: /*
        !           520:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
        !           521:  * included, the real payload length will be stored in plenp.
        !           522:  */
        !           523: static int
        !           524: ip6_hopopts_input(plenp, rtalertp, mp, offp)
        !           525:        u_int32_t *plenp;
        !           526:        long *rtalertp;         /* XXX: should be stored more smart way */
        !           527:        struct mbuf **mp;
        !           528:        int *offp;
        !           529: {
        !           530:        register struct mbuf *m = *mp;
        !           531:        int off = *offp, hbhlen;
        !           532:        struct ip6_hbh *hbh;
        !           533:        u_int8_t *opt;
        !           534:
        !           535:        /* validation of the length of the header */
        !           536:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
        !           537:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
        !           538:        hbhlen = (hbh->ip6h_len + 1) << 3;
        !           539:
        !           540:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
        !           541:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
        !           542:        off += hbhlen;
        !           543:        hbhlen -= sizeof(struct ip6_hbh);
        !           544:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
        !           545:
        !           546:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
        !           547:                                hbhlen, rtalertp, plenp) < 0)
        !           548:                return(-1);
        !           549:
        !           550:        *offp = off;
        !           551:        *mp = m;
        !           552:        return(0);
        !           553: }
        !           554:
        !           555: /*
        !           556:  * Search header for all Hop-by-hop options and process each option.
        !           557:  * This function is separate from ip6_hopopts_input() in order to
        !           558:  * handle a case where the sending node itself process its hop-by-hop
        !           559:  * options header. In such a case, the function is called from ip6_output().
        !           560:  */
        !           561: int
        !           562: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
        !           563:        struct mbuf *m;
        !           564:        u_int8_t *opthead;
        !           565:        int hbhlen;
        !           566:        long *rtalertp;
        !           567:        u_int32_t *plenp;
        !           568: {
        !           569:        struct ip6_hdr *ip6;
        !           570:        int optlen = 0;
        !           571:        u_int8_t *opt = opthead;
        !           572:        u_int16_t rtalert_val;
        !           573:
        !           574:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
        !           575:                switch(*opt) {
        !           576:                 case IP6OPT_PAD1:
        !           577:                         optlen = 1;
        !           578:                         break;
        !           579:                 case IP6OPT_PADN:
        !           580:                         if (hbhlen < IP6OPT_MINLEN) {
        !           581:                                 ip6stat.ip6s_toosmall++;
        !           582:                                 goto bad;
        !           583:                         }
        !           584:                         optlen = *(opt + 1) + 2;
        !           585:                         break;
        !           586:                 case IP6OPT_RTALERT:
        !           587:                         if (hbhlen < IP6OPT_RTALERT_LEN) {
        !           588:                                 ip6stat.ip6s_toosmall++;
        !           589:                                 goto bad;
        !           590:                         }
        !           591:                         if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
        !           592:                                  /* XXX: should we discard the packet? */
        !           593:                                 log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
        !           594:                                     *(opt + 1));
        !           595:                         optlen = IP6OPT_RTALERT_LEN;
        !           596:                         bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
        !           597:                         *rtalertp = ntohs(rtalert_val);
        !           598:                         break;
        !           599:                 case IP6OPT_JUMBO:
        !           600:                         if (hbhlen < IP6OPT_JUMBO_LEN) {
        !           601:                                 ip6stat.ip6s_toosmall++;
        !           602:                                 goto bad;
        !           603:                         }
        !           604:                         if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
        !           605:                                  /* XXX: should we discard the packet? */
        !           606:                                 log(LOG_ERR, "length of jumbopayload opt "
        !           607:                                     "is inconsistent(%d)",
        !           608:                                     *(opt + 1));
        !           609:                         optlen = IP6OPT_JUMBO_LEN;
        !           610:
        !           611:                         /*
        !           612:                          * We can simply cast because of the alignment
        !           613:                          * requirement of the jumbo payload option.
        !           614:                          */
        !           615:                         *plenp = ntohl(*(u_int32_t *)(opt + 2));
        !           616:                         if (*plenp <= IPV6_MAXPACKET) {
        !           617:                                 /*
        !           618:                                  * jumbo payload length must be larger
        !           619:                                  * than 65535
        !           620:                                  */
        !           621:                                 ip6stat.ip6s_badoptions++;
        !           622:                                 icmp6_error(m, ICMP6_PARAM_PROB,
        !           623:                                             ICMP6_PARAMPROB_HEADER,
        !           624:                                             sizeof(struct ip6_hdr) +
        !           625:                                             sizeof(struct ip6_hbh) +
        !           626:                                             opt + 2 - opthead);
        !           627:                                 return(-1);
        !           628:                         }
        !           629:
        !           630:                         ip6 = mtod(m, struct ip6_hdr *);
        !           631:                         if (ip6->ip6_plen) {
        !           632:                                 /*
        !           633:                                  * IPv6 packets that have non 0 payload length
        !           634:                                  * must not contain a jumbo paylod option.
        !           635:                                  */
        !           636:                                 ip6stat.ip6s_badoptions++;
        !           637:                                 icmp6_error(m, ICMP6_PARAM_PROB,
        !           638:                                             ICMP6_PARAMPROB_HEADER,
        !           639:                                             sizeof(struct ip6_hdr) +
        !           640:                                             sizeof(struct ip6_hbh) +
        !           641:                                             opt - opthead);
        !           642:                                 return(-1);
        !           643:                         }
        !           644:                         break;
        !           645:                 default:               /* unknown option */
        !           646:                         if (hbhlen < IP6OPT_MINLEN) {
        !           647:                                 ip6stat.ip6s_toosmall++;
        !           648:                                 goto bad;
        !           649:                         }
        !           650:                         if ((optlen = ip6_unknown_opt(opt, m,
        !           651:                                                       sizeof(struct ip6_hdr) +
        !           652:                                                       sizeof(struct ip6_hbh) +
        !           653:                                                       opt - opthead)) == -1)
        !           654:                                 return(-1);
        !           655:                         optlen += 2;
        !           656:                         break;
        !           657:                }
        !           658:        }
        !           659:
        !           660:        return(0);
        !           661:
        !           662:   bad:
        !           663:        m_freem(m);
        !           664:        return(-1);
        !           665: }
        !           666:
        !           667: /*
        !           668:  * Unknown option processing.
        !           669:  * The third argument `off' is the offset from the IPv6 header to the option,
        !           670:  * which is necessary if the IPv6 header the and option header and IPv6 header
        !           671:  * is not continuous in order to return an ICMPv6 error.
        !           672:  */
        !           673: int
        !           674: ip6_unknown_opt(optp, m, off)
        !           675:        u_int8_t *optp;
        !           676:        struct mbuf *m;
        !           677:        int off;
        !           678: {
        !           679:        struct ip6_hdr *ip6;
        !           680:
        !           681:        switch(IP6OPT_TYPE(*optp)) {
        !           682:         case IP6OPT_TYPE_SKIP: /* ignore the option */
        !           683:                 return((int)*(optp + 1));
        !           684:         case IP6OPT_TYPE_DISCARD:      /* silently discard */
        !           685:                 m_freem(m);
        !           686:                 return(-1);
        !           687:         case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
        !           688:                 ip6stat.ip6s_badoptions++;
        !           689:                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
        !           690:                 return(-1);
        !           691:         case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
        !           692:                 ip6stat.ip6s_badoptions++;
        !           693:                 ip6 = mtod(m, struct ip6_hdr *);
        !           694:                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
        !           695:                     (m->m_flags & (M_BCAST|M_MCAST)))
        !           696:                         m_freem(m);
        !           697:                 else
        !           698:                         icmp6_error(m, ICMP6_PARAM_PROB,
        !           699:                                     ICMP6_PARAMPROB_OPTION, off);
        !           700:                 return(-1);
        !           701:        }
        !           702:
        !           703:        m_freem(m);             /* XXX: NOTREACHED */
        !           704:        return(-1);
        !           705: }
        !           706:
        !           707: /*
        !           708:  * Create the "control" list for this pcb
        !           709:  */
        !           710: void
        !           711: ip6_savecontrol(in6p, mp, ip6, m)
        !           712:        register struct in6pcb *in6p;
        !           713:        register struct mbuf **mp;
        !           714:        register struct ip6_hdr *ip6;
        !           715:        register struct mbuf *m;
        !           716: {
        !           717: #ifdef __NetBSD__
        !           718:        struct proc *p = curproc;       /* XXX */
        !           719: #endif
        !           720: #ifdef __bsdi__
        !           721: # define sbcreatecontrol       so_cmsg
        !           722: #endif
        !           723:
        !           724:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
        !           725:                struct timeval tv;
        !           726:
        !           727:                microtime(&tv);
        !           728:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
        !           729:                        SCM_TIMESTAMP, SOL_SOCKET);
        !           730:                if (*mp)
        !           731:                        mp = &(*mp)->m_next;
        !           732:        }
        !           733:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
        !           734:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
        !           735:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
        !           736:                        IPPROTO_IPV6);
        !           737:                if (*mp)
        !           738:                        mp = &(*mp)->m_next;
        !           739:        }
        !           740:
        !           741: #ifdef noyet
        !           742:        /* options were tossed above */
        !           743:        if (in6p->in6p_flags & IN6P_RECVOPTS)
        !           744:                /* broken */
        !           745:        /* ip6_srcroute doesn't do what we want here, need to fix */
        !           746:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
        !           747:                /* broken */
        !           748: #endif
        !           749:
        !           750:        /* RFC 2292 sec. 5 */
        !           751:        if (in6p->in6p_flags & IN6P_PKTINFO) {
        !           752:                struct in6_pktinfo pi6;
        !           753:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
        !           754:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
        !           755:                        pi6.ipi6_addr.s6_addr16[1] = 0;
        !           756:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
        !           757:                                        ? m->m_pkthdr.rcvif->if_index
        !           758:                                        : 0;
        !           759:                *mp = sbcreatecontrol((caddr_t) &pi6,
        !           760:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
        !           761:                        IPPROTO_IPV6);
        !           762:                if (*mp)
        !           763:                        mp = &(*mp)->m_next;
        !           764:        }
        !           765:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
        !           766:                int hlim = ip6->ip6_hlim & 0xff;
        !           767:                *mp = sbcreatecontrol((caddr_t) &hlim,
        !           768:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
        !           769:                if (*mp)
        !           770:                        mp = &(*mp)->m_next;
        !           771:        }
        !           772:        /* IN6P_NEXTHOP - for outgoing packet only */
        !           773:
        !           774:        /*
        !           775:         * IPV6_HOPOPTS socket option. We require super-user privilege
        !           776:         * for the option, but it might be too strict, since there might
        !           777:         * be some hop-by-hop options which can be returned to normal user.
        !           778:         * See RFC 2292 section 6.
        !           779:         */
        !           780:        if ((in6p->in6p_flags & IN6P_HOPOPTS) &&
        !           781:            p && !suser(p->p_ucred, &p->p_acflag)) {
        !           782:                /*
        !           783:                 * Check if a hop-by-hop options header is contatined in the
        !           784:                 * received packet, and if so, store the options as ancillary
        !           785:                 * data. Note that a hop-by-hop options header must be
        !           786:                 * just after the IPv6 header, which fact is assured through
        !           787:                 * the IPv6 input processing.
        !           788:                 */
        !           789:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
        !           790:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
        !           791:                        struct ip6_hbh *hbh = (struct ip6_hbh *)(ip6 + 1);
        !           792:
        !           793:                        /*
        !           794:                         * XXX: We copy whole the header even if a jumbo
        !           795:                         * payload option is included, which option is to
        !           796:                         * be removed before returning in the RFC 2292.
        !           797:                         * But it's too painful operation...
        !           798:                         */
        !           799:                        *mp = sbcreatecontrol((caddr_t)hbh,
        !           800:                                              (hbh->ip6h_len + 1) << 3,
        !           801:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
        !           802:                        if (*mp)
        !           803:                                mp = &(*mp)->m_next;
        !           804:                }
        !           805:        }
        !           806:
        !           807:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
        !           808:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
        !           809:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
        !           810:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
        !           811:
        !           812:                /*
        !           813:                 * Search for destination options headers or routing
        !           814:                 * header(s) through the header chain, and stores each
        !           815:                 * header as ancillary data.
        !           816:                 * Note that the order of the headers remains in
        !           817:                 * the chain of ancillary data.
        !           818:                 */
        !           819:                while(1) {      /* is explicit loop prevention necessary? */
        !           820:                        struct ip6_ext *ip6e =
        !           821:                                (struct ip6_ext *)(mtod(m, caddr_t) + off);
        !           822:
        !           823:                        switch(nxt) {
        !           824:                         case IPPROTO_DSTOPTS:
        !           825:                                 if (!in6p->in6p_flags & IN6P_DSTOPTS)
        !           826:                                         break;
        !           827:
        !           828:                                 /*
        !           829:                                  * We also require super-user privilege for
        !           830:                                  * the option.
        !           831:                                  * See the comments on IN6_HOPOPTS.
        !           832:                                  */
        !           833:                                 if (!p || !suser(p->p_ucred, &p->p_acflag))
        !           834:                                         break;
        !           835:
        !           836:                                 *mp = sbcreatecontrol((caddr_t)ip6e,
        !           837:                                                       (ip6e->ip6e_len + 1) << 3,
        !           838:                                                       IPV6_DSTOPTS,
        !           839:                                                       IPPROTO_IPV6);
        !           840:                                 if (*mp)
        !           841:                                         mp = &(*mp)->m_next;
        !           842:                                 break;
        !           843:
        !           844:                         case IPPROTO_ROUTING:
        !           845:                                 if (!in6p->in6p_flags & IN6P_RTHDR)
        !           846:                                         break;
        !           847:
        !           848:                                 *mp = sbcreatecontrol((caddr_t)ip6e,
        !           849:                                                       (ip6e->ip6e_len + 1) << 3,
        !           850:                                                       IPV6_RTHDR,
        !           851:                                                       IPPROTO_IPV6);
        !           852:                                 if (*mp)
        !           853:                                         mp = &(*mp)->m_next;
        !           854:                                 break;
        !           855:
        !           856:                         case IPPROTO_UDP:
        !           857:                         case IPPROTO_TCP:
        !           858:                         case IPPROTO_ICMPV6:
        !           859:                         default:
        !           860:                                 /*
        !           861:                                  * stop search if we encounter an upper
        !           862:                                  * layer protocol headers.
        !           863:                                  */
        !           864:                                 goto loopend;
        !           865:
        !           866:                         case IPPROTO_HOPOPTS:
        !           867:                         case IPPROTO_AH: /* is it possible? */
        !           868:                                 break;
        !           869:                        }
        !           870:
        !           871:                        /* proceed with the next header. */
        !           872:                        if (nxt == IPPROTO_AH)
        !           873:                                off += (ip6e->ip6e_len + 2) << 2;
        !           874:                        else
        !           875:                                off += (ip6e->ip6e_len + 1) << 3;
        !           876:                        nxt = ip6e->ip6e_nxt;
        !           877:                }
        !           878:          loopend:
        !           879:        }
        !           880:        if ((in6p->in6p_flags & IN6P_HOPOPTS)
        !           881:         && p && !suser(p->p_ucred, &p->p_acflag)) {
        !           882:                /* to be done */
        !           883:        }
        !           884:        if ((in6p->in6p_flags & IN6P_DSTOPTS)
        !           885:         && p && !suser(p->p_ucred, &p->p_acflag)) {
        !           886:                /* to be done */
        !           887:        }
        !           888:        /* IN6P_RTHDR - to be done */
        !           889:
        !           890: #ifdef __bsdi__
        !           891: # undef sbcreatecontrol
        !           892: #endif
        !           893: }
        !           894:
        !           895: /*
        !           896:  * Get pointer to the previous header followed by the header
        !           897:  * currently processed.
        !           898:  * XXX: This function supposes that
        !           899:  *     M includes all headers,
        !           900:  *     the next header field and the header length field of each header
        !           901:  *     are valid, and
        !           902:  *     the sum of each header length equals to OFF.
        !           903:  * Because of these assumptions, this function must be called very
        !           904:  * carefully. Moreover, it will not be used in the near future when
        !           905:  * we develop `neater' mechanism to process extension headers.
        !           906:  */
        !           907: char *
        !           908: ip6_get_prevhdr(m, off)
        !           909:        struct mbuf *m;
        !           910:        int off;
        !           911: {
        !           912:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
        !           913:
        !           914:        if (off == sizeof(struct ip6_hdr))
        !           915:                return(&ip6->ip6_nxt);
        !           916:        else {
        !           917:                int len, nxt;
        !           918:                struct ip6_ext *ip6e = NULL;
        !           919:
        !           920:                nxt = ip6->ip6_nxt;
        !           921:                len = sizeof(struct ip6_hdr);
        !           922:                while (len < off) {
        !           923:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
        !           924:
        !           925:                        switch(nxt) {
        !           926:                        case IPPROTO_FRAGMENT:
        !           927:                                len += sizeof(struct ip6_frag);
        !           928:                                break;
        !           929:                        case IPPROTO_AH:
        !           930:                                len += (ip6e->ip6e_len + 2) << 2;
        !           931:                                break;
        !           932:                        default:
        !           933:                                len += (ip6e->ip6e_len + 1) << 3;
        !           934:                                break;
        !           935:                        }
        !           936:                        nxt = ip6e->ip6e_nxt;
        !           937:                }
        !           938:                if (ip6e)
        !           939:                        return(&ip6e->ip6e_nxt);
        !           940:                else
        !           941:                        return NULL;
        !           942:        }
        !           943: }
        !           944:
        !           945: /*
        !           946:  * System control for IP6
        !           947:  */
        !           948:
        !           949: u_char inet6ctlerrmap[PRC_NCMDS] = {
        !           950:        0,              0,              0,              0,
        !           951:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
        !           952:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
        !           953:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
        !           954:        0,              0,              0,              0,
        !           955:        ENOPROTOOPT
        !           956: };
        !           957:
        !           958: #ifdef __NetBSD__
        !           959: #include <vm/vm.h>
        !           960: #include <sys/sysctl.h>
        !           961:
        !           962: int
        !           963: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
        !           964:        int *name;
        !           965:        u_int namelen;
        !           966:        void *oldp;
        !           967:        size_t *oldlenp;
        !           968:        void *newp;
        !           969:        size_t newlen;
        !           970: {
        !           971:        /* All sysctl names at this level are terminal. */
        !           972:        if (namelen != 1)
        !           973:                return ENOTDIR;
        !           974:
        !           975:        switch (name[0]) {
        !           976:
        !           977:        case IPV6CTL_FORWARDING:
        !           978:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !           979:                                  &ip6_forwarding);
        !           980:        case IPV6CTL_SENDREDIRECTS:
        !           981:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !           982:                                &ip6_sendredirects);
        !           983:        case IPV6CTL_DEFHLIM:
        !           984:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
        !           985:        case IPV6CTL_MAXFRAGPACKETS:
        !           986:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !           987:                                &ip6_maxfragpackets);
        !           988:        case IPV6CTL_ACCEPT_RTADV:
        !           989:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !           990:                                &ip6_accept_rtadv);
        !           991:        case IPV6CTL_KEEPFAITH:
        !           992:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
        !           993:        case IPV6CTL_LOG_INTERVAL:
        !           994:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !           995:                                &ip6_log_interval);
        !           996:        case IPV6CTL_HDRNESTLIMIT:
        !           997:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !           998:                                &ip6_hdrnestlimit);
        !           999:        case IPV6CTL_DAD_COUNT:
        !          1000:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
        !          1001:        case IPV6CTL_AUTO_FLOWLABEL:
        !          1002:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !          1003:                                &ip6_auto_flowlabel);
        !          1004:        case IPV6CTL_DEFMCASTHLIM:
        !          1005:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !          1006:                                &ip6_defmcasthlim);
        !          1007:        case IPV6CTL_GIF_HLIM:
        !          1008:                return sysctl_int(oldp, oldlenp, newp, newlen,
        !          1009:                                &ip6_gif_hlim);
        !          1010:        case IPV6CTL_KAME_VERSION:
        !          1011:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
        !          1012:        default:
        !          1013:                return EOPNOTSUPP;
        !          1014:        }
        !          1015:        /* NOTREACHED */
        !          1016: }
        !          1017: #endif /* __NetBSD__ */

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