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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.52.2.3

1.52.2.3! gehenna     1: /*     $NetBSD: ip6_input.c,v 1.57 2002/06/30 22:40:39 thorpej Exp $   */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      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.
1.21      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:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
                     45:  * 3. All advertising materials mentioning features or use of this software
                     46:  *    must display the following acknowledgement:
                     47:  *     This product includes software developed by the University of
                     48:  *     California, Berkeley and its contributors.
                     49:  * 4. Neither the name of the University nor the names of its contributors
                     50:  *    may be used to endorse or promote products derived from this software
                     51:  *    without specific prior written permission.
                     52:  *
                     53:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     54:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     55:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     56:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     57:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     58:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     59:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     60:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     61:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     62:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     63:  * SUCH DAMAGE.
                     64:  *
                     65:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     66:  */
1.48      lukem      67:
                     68: #include <sys/cdefs.h>
1.52.2.3! gehenna    69: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.57 2002/06/30 22:40:39 thorpej Exp $");
1.2       itojun     70:
                     71: #include "opt_inet.h"
1.4       thorpej    72: #include "opt_ipsec.h"
1.15      darrenr    73: #include "opt_pfil_hooks.h"
1.2       itojun     74:
                     75: #include <sys/param.h>
                     76: #include <sys/systm.h>
                     77: #include <sys/malloc.h>
                     78: #include <sys/mbuf.h>
                     79: #include <sys/domain.h>
                     80: #include <sys/protosw.h>
                     81: #include <sys/socket.h>
                     82: #include <sys/socketvar.h>
                     83: #include <sys/errno.h>
                     84: #include <sys/time.h>
                     85: #include <sys/kernel.h>
                     86: #include <sys/syslog.h>
                     87: #include <sys/proc.h>
1.46      simonb     88: #include <sys/sysctl.h>
1.2       itojun     89:
                     90: #include <net/if.h>
                     91: #include <net/if_types.h>
                     92: #include <net/if_dl.h>
                     93: #include <net/route.h>
                     94: #include <net/netisr.h>
1.15      darrenr    95: #ifdef PFIL_HOOKS
                     96: #include <net/pfil.h>
                     97: #endif
1.2       itojun     98:
                     99: #include <netinet/in.h>
1.9       itojun    100: #include <netinet/in_systm.h>
                    101: #ifdef INET
                    102: #include <netinet/ip.h>
                    103: #include <netinet/ip_icmp.h>
1.45      itojun    104: #endif /* INET */
1.14      itojun    105: #include <netinet/ip6.h>
1.2       itojun    106: #include <netinet6/in6_var.h>
1.11      itojun    107: #include <netinet6/ip6_var.h>
1.2       itojun    108: #include <netinet6/in6_pcb.h>
1.14      itojun    109: #include <netinet/icmp6.h>
1.2       itojun    110: #include <netinet6/in6_ifattach.h>
                    111: #include <netinet6/nd6.h>
                    112:
1.37      itojun    113: #ifdef IPSEC
                    114: #include <netinet6/ipsec.h>
                    115: #endif
                    116:
1.2       itojun    117: #include <netinet6/ip6protosw.h>
                    118:
                    119: /* we need it for NLOOP. */
                    120: #include "loop.h"
                    121: #include "faith.h"
                    122: #include "gif.h"
                    123: #include "bpfilter.h"
1.50      itojun    124:
                    125: #if NGIF > 0
                    126: #include <netinet6/in6_gif.h>
                    127: #endif
1.2       itojun    128:
1.9       itojun    129: #include <net/net_osdep.h>
                    130:
1.2       itojun    131: extern struct domain inet6domain;
                    132:
                    133: u_char ip6_protox[IPPROTO_MAX];
                    134: static int ip6qmaxlen = IFQ_MAXLEN;
                    135: struct in6_ifaddr *in6_ifaddr;
                    136: struct ifqueue ip6intrq;
                    137:
                    138: extern struct ifnet loif[NLOOP];
                    139: int ip6_forward_srcrt;                 /* XXX */
                    140: int ip6_sourcecheck;                   /* XXX */
                    141: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    142:
1.29      thorpej   143: #ifdef PFIL_HOOKS
                    144: struct pfil_head inet6_pfil_hook;
                    145: #endif
                    146:
1.2       itojun    147: struct ip6stat ip6stat;
                    148:
                    149: static void ip6_init2 __P((void *));
                    150:
1.5       itojun    151: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2       itojun    152:
                    153: /*
                    154:  * IP6 initialization: fill in IP6 protocol switch table.
                    155:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    156:  */
                    157: void
                    158: ip6_init()
                    159: {
1.35      itojun    160:        struct ip6protosw *pr;
                    161:        int i;
1.2       itojun    162:
                    163:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    164:        if (pr == 0)
                    165:                panic("ip6_init");
                    166:        for (i = 0; i < IPPROTO_MAX; i++)
                    167:                ip6_protox[i] = pr - inet6sw;
                    168:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    169:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    170:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    171:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    172:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    173:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    174:        nd6_init();
                    175:        frag6_init();
1.52.2.1  gehenna   176:        ip6_flow_seq = arc4random();
1.2       itojun    177:
                    178:        ip6_init2((void *)0);
1.29      thorpej   179:
                    180: #ifdef PFIL_HOOKS
                    181:        /* Register our Packet Filter hook. */
1.33      thorpej   182:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    183:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   184:        i = pfil_head_register(&inet6_pfil_hook);
                    185:        if (i != 0)
                    186:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    187:                    "error %d\n", i);
                    188: #endif /* PFIL_HOOKS */
1.2       itojun    189: }
                    190:
                    191: static void
                    192: ip6_init2(dummy)
                    193:        void *dummy;
                    194: {
                    195:
                    196:        /* nd6_timer_init */
1.19      thorpej   197:        callout_init(&nd6_timer_ch);
                    198:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.2       itojun    199: }
                    200:
                    201: /*
                    202:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    203:  */
                    204: void
                    205: ip6intr()
                    206: {
                    207:        int s;
                    208:        struct mbuf *m;
                    209:
                    210:        for (;;) {
1.41      thorpej   211:                s = splnet();
1.2       itojun    212:                IF_DEQUEUE(&ip6intrq, m);
                    213:                splx(s);
                    214:                if (m == 0)
                    215:                        return;
                    216:                ip6_input(m);
                    217:        }
                    218: }
                    219:
                    220: extern struct  route_in6 ip6_forward_rt;
                    221:
                    222: void
                    223: ip6_input(m)
                    224:        struct mbuf *m;
                    225: {
1.9       itojun    226:        struct ip6_hdr *ip6;
1.2       itojun    227:        int off = sizeof(struct ip6_hdr), nest;
                    228:        u_int32_t plen;
1.5       itojun    229:        u_int32_t rtalert = ~0;
1.2       itojun    230:        int nxt, ours = 0;
1.9       itojun    231:        struct ifnet *deliverifp = NULL;
1.2       itojun    232:
                    233: #ifdef IPSEC
                    234:        /*
                    235:         * should the inner packet be considered authentic?
                    236:         * see comment in ah4_input().
                    237:         */
1.49      itojun    238:        m->m_flags &= ~M_AUTHIPHDR;
                    239:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    240: #endif
1.9       itojun    241:
1.2       itojun    242:        /*
1.44      itojun    243:         * mbuf statistics
1.2       itojun    244:         */
                    245:        if (m->m_flags & M_EXT) {
                    246:                if (m->m_next)
                    247:                        ip6stat.ip6s_mext2m++;
                    248:                else
                    249:                        ip6stat.ip6s_mext1++;
                    250:        } else {
1.40      itojun    251: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2       itojun    252:                if (m->m_next) {
1.9       itojun    253:                        if (m->m_flags & M_LOOP) {
1.44      itojun    254:                                ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40      itojun    255:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    256:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    257:                        else
                    258:                                ip6stat.ip6s_m2m[0]++;
                    259:                } else
                    260:                        ip6stat.ip6s_m1++;
1.40      itojun    261: #undef M2MMAX
1.2       itojun    262:        }
                    263:
1.9       itojun    264:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    265:        ip6stat.ip6s_total++;
                    266:
                    267: #ifndef PULLDOWN_TEST
                    268:        /* XXX is the line really necessary? */
1.2       itojun    269:        IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9       itojun    270: #endif
1.2       itojun    271:
1.52.2.3! gehenna   272:        /*
        !           273:         * If the IPv6 header is not aligned, slurp it up into a new
        !           274:         * mbuf with space for link headers, in the event we forward
        !           275:         * it.  OTherwise, if it is aligned, make sure the entire base
        !           276:         * IPv6 header is in the first mbuf of the chain.
        !           277:         */
        !           278:        if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
        !           279:                struct ifnet *inifp = m->m_pkthdr.rcvif;
        !           280:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
        !           281:                                  (max_linkhdr + 3) & ~3)) == NULL) {
        !           282:                        /* XXXJRT new stat, please */
        !           283:                        ip6stat.ip6s_toosmall++;
        !           284:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
        !           285:                        return;
        !           286:                }
        !           287:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
        !           288:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.52.2.2  gehenna   289:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9       itojun    290:                        ip6stat.ip6s_toosmall++;
                    291:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    292:                        return;
                    293:                }
1.2       itojun    294:        }
                    295:
                    296:        ip6 = mtod(m, struct ip6_hdr *);
                    297:
                    298:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    299:                ip6stat.ip6s_badvers++;
1.9       itojun    300:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    301:                goto bad;
                    302:        }
1.15      darrenr   303:
                    304: #ifdef PFIL_HOOKS
                    305:        /*
                    306:         * Run through list of hooks for input packets.  If there are any
                    307:         * filters which require that additional packets in the flow are
                    308:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    309:         * Note that filters must _never_ set this flag, as another filter
                    310:         * in the list may have previously cleared it.
                    311:         */
1.39      itojun    312:        /*
                    313:         * let ipfilter look at packet on the wire,
                    314:         * not the decapsulated packet.
                    315:         */
                    316: #ifdef IPSEC
1.42      itojun    317:        if (!ipsec_getnhist(m))
1.39      itojun    318: #else
                    319:        if (1)
                    320: #endif
                    321:        {
                    322:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    323:                                   PFIL_IN) != 0)
                    324:                        return;
                    325:                if (m == NULL)
                    326:                        return;
                    327:                ip6 = mtod(m, struct ip6_hdr *);
                    328:        }
1.15      darrenr   329: #endif /* PFIL_HOOKS */
                    330:
1.2       itojun    331:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    332:
1.30      thorpej   333: #ifdef ALTQ
                    334:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    335:                /* packet is dropped by traffic conditioner */
                    336:                return;
1.9       itojun    337:        }
                    338: #endif
                    339:
1.2       itojun    340:        /*
1.44      itojun    341:         * Check against address spoofing/corruption.
1.2       itojun    342:         */
                    343:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    344:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.52.2.2  gehenna   345:                /*
                    346:                 * XXX: "badscope" is not very suitable for a multicast source.
                    347:                 */
1.2       itojun    348:                ip6stat.ip6s_badscope++;
1.9       itojun    349:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    350:                goto bad;
                    351:        }
1.13      itojun    352:        /*
1.44      itojun    353:         * The following check is not documented in specs.  A malicious
                    354:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    355:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    356:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    357:         *
1.44      itojun    358:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    359:         * support IPv4-less kernel compilation, we cannot support SIIT
                    360:         * environment at all.  So, it makes more sense for us to reject any
                    361:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       362:         * partial support for SIIT environment.
1.13      itojun    363:         */
                    364:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    365:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    366:                ip6stat.ip6s_badscope++;
                    367:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    368:                goto bad;
                    369:        }
1.17      itojun    370: #if 0
1.13      itojun    371:        /*
1.17      itojun    372:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    373:         *
                    374:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    375:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    376:         * is revised to forbid relaying case.
1.13      itojun    377:         */
                    378:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    379:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    380:                ip6stat.ip6s_badscope++;
                    381:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    382:                goto bad;
                    383:        }
                    384: #endif
1.35      itojun    385:
1.2       itojun    386:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    387:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    388:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    389:                        ours = 1;
1.9       itojun    390:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    391:                        goto hbhcheck;
                    392:                } else {
                    393:                        ip6stat.ip6s_badscope++;
1.9       itojun    394:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    395:                        goto bad;
                    396:                }
                    397:        }
                    398:
1.38      itojun    399:        /* drop packets if interface ID portion is already filled */
                    400:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    401:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
                    402:                    ip6->ip6_src.s6_addr16[1]) {
                    403:                        ip6stat.ip6s_badscope++;
                    404:                        goto bad;
                    405:                }
                    406:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
                    407:                    ip6->ip6_dst.s6_addr16[1]) {
                    408:                        ip6stat.ip6s_badscope++;
                    409:                        goto bad;
                    410:                }
                    411:        }
1.2       itojun    412:
1.40      itojun    413:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    414:                ip6->ip6_src.s6_addr16[1]
                    415:                        = htons(m->m_pkthdr.rcvif->if_index);
                    416:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    417:                ip6->ip6_dst.s6_addr16[1]
                    418:                        = htons(m->m_pkthdr.rcvif->if_index);
                    419:
                    420:        /*
                    421:         * We use rt->rt_ifp to determine if the address is ours or not.
                    422:         * If rt_ifp is lo0, the address is ours.
                    423:         * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
                    424:         * so any address under fe80::%lo0/64 will be mistakenly considered
                    425:         * local.  The special case is supplied to handle the case properly
                    426:         * by actually looking at interface addresses
                    427:         * (using in6ifa_ifpwithaddr).
                    428:         */
                    429:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
                    430:            IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    431:                if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
                    432:                        icmp6_error(m, ICMP6_DST_UNREACH,
                    433:                            ICMP6_DST_UNREACH_ADDR, 0);
                    434:                        /* m is already freed */
                    435:                        return;
1.21      itojun    436:                }
1.40      itojun    437:
                    438:                ours = 1;
                    439:                deliverifp = m->m_pkthdr.rcvif;
                    440:                goto hbhcheck;
1.9       itojun    441:        }
                    442:
1.2       itojun    443:        /*
                    444:         * Multicast check
                    445:         */
                    446:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    447:                struct  in6_multi *in6m = 0;
1.9       itojun    448:
                    449:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    450:                /*
                    451:                 * See if we belong to the destination multicast group on the
                    452:                 * arrival interface.
                    453:                 */
                    454:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    455:                if (in6m)
                    456:                        ours = 1;
                    457:                else if (!ip6_mrouter) {
                    458:                        ip6stat.ip6s_notmember++;
                    459:                        ip6stat.ip6s_cantforward++;
1.9       itojun    460:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    461:                        goto bad;
                    462:                }
1.9       itojun    463:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    464:                goto hbhcheck;
                    465:        }
                    466:
                    467:        /*
                    468:         *  Unicast check
                    469:         */
1.22      itojun    470:        if (ip6_forward_rt.ro_rt != NULL &&
1.52.2.2  gehenna   471:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
1.22      itojun    472:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35      itojun    473:                               &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25      itojun    474:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    475:        else {
1.35      itojun    476:                struct sockaddr_in6 *dst6;
                    477:
1.2       itojun    478:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    479:                        /* route is down or destination is different */
1.25      itojun    480:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    481:                        RTFREE(ip6_forward_rt.ro_rt);
                    482:                        ip6_forward_rt.ro_rt = 0;
                    483:                }
1.22      itojun    484:
1.2       itojun    485:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35      itojun    486:                dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
                    487:                dst6->sin6_len = sizeof(struct sockaddr_in6);
                    488:                dst6->sin6_family = AF_INET6;
                    489:                dst6->sin6_addr = ip6->ip6_dst;
1.2       itojun    490:
1.9       itojun    491:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    492:        }
                    493:
                    494: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    495:
                    496:        /*
                    497:         * Accept the packet if the forwarding interface to the destination
                    498:         * according to the routing table is the loopback interface,
                    499:         * unless the associated route has a gateway.
                    500:         * Note that this approach causes to accept a packet if there is a
                    501:         * route to the loopback interface for the destination of the packet.
                    502:         * But we think it's even useful in some situations, e.g. when using
                    503:         * a special daemon which wants to intercept the packet.
                    504:         */
                    505:        if (ip6_forward_rt.ro_rt &&
                    506:            (ip6_forward_rt.ro_rt->rt_flags &
                    507:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.52.2.2  gehenna   508:            !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2       itojun    509: #if 0
                    510:            /*
                    511:             * The check below is redundant since the comparison of
                    512:             * the destination and the key of the rtentry has
                    513:             * already done through looking up the routing table.
                    514:             */
                    515:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.52.2.2  gehenna   516:            &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2       itojun    517: #endif
1.9       itojun    518:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    519:                struct in6_ifaddr *ia6 =
                    520:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    521:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    522:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    523:                /*
                    524:                 * packets to a tentative, duplicated, or somehow invalid
                    525:                 * address must not be accepted.
                    526:                 */
1.2       itojun    527:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    528:                        /* this address is ready */
1.2       itojun    529:                        ours = 1;
1.9       itojun    530:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    531:                        goto hbhcheck;
                    532:                } else {
1.24      itojun    533:                        /* address is not ready, so discard the packet. */
1.34      itojun    534:                        nd6log((LOG_INFO,
1.27      itojun    535:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    536:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    537:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    538:
                    539:                        goto bad;
1.2       itojun    540:                }
                    541:        }
                    542:
                    543:        /*
1.52.2.2  gehenna   544:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    545:         */
                    546: #if defined(NFAITH) && 0 < NFAITH
                    547:        if (ip6_keepfaith) {
                    548:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    549:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    550:                        /* XXX do we need more sanity checks? */
                    551:                        ours = 1;
1.45      itojun    552:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9       itojun    553:                        goto hbhcheck;
                    554:                }
                    555:        }
                    556: #endif
                    557:
                    558: #if 0
                    559:     {
                    560:        /*
                    561:         * Last resort: check in6_ifaddr for incoming interface.
                    562:         * The code is here until I update the "goto ours hack" code above
                    563:         * working right.
                    564:         */
                    565:        struct ifaddr *ifa;
                    566:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    567:             ifa;
                    568:             ifa = ifa->ifa_list.tqe_next) {
                    569:                if (ifa->ifa_addr == NULL)
                    570:                        continue;       /* just for safety */
                    571:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    572:                        continue;
                    573:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    574:                        ours = 1;
                    575:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    576:                        goto hbhcheck;
                    577:                }
                    578:        }
1.9       itojun    579:     }
1.2       itojun    580: #endif
                    581:
                    582:        /*
                    583:         * Now there is no reason to process the packet if it's not our own
                    584:         * and we're not a router.
                    585:         */
                    586:        if (!ip6_forwarding) {
                    587:                ip6stat.ip6s_cantforward++;
1.9       itojun    588:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    589:                goto bad;
                    590:        }
                    591:
                    592:   hbhcheck:
                    593:        /*
                    594:         * Process Hop-by-Hop options header if it's contained.
                    595:         * m may be modified in ip6_hopopts_input().
                    596:         * If a JumboPayload option is included, plen will also be modified.
                    597:         */
                    598:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    599:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    600:                struct ip6_hbh *hbh;
                    601:
                    602:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    603: #if 0  /*touches NULL pointer*/
                    604:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    605: #endif
1.2       itojun    606:                        return; /* m have already been freed */
1.9       itojun    607:                }
1.22      itojun    608:
1.2       itojun    609:                /* adjust pointer */
                    610:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    611:
                    612:                /*
1.49      itojun    613:                 * if the payload length field is 0 and the next header field
1.22      itojun    614:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    615:                 * option MUST be included.
                    616:                 */
                    617:                if (ip6->ip6_plen == 0 && plen == 0) {
                    618:                        /*
                    619:                         * Note that if a valid jumbo payload option is
                    620:                         * contained, ip6_hoptops_input() must set a valid
1.52.2.2  gehenna   621:                         * (non-zero) payload length to the variable plen.
1.22      itojun    622:                         */
                    623:                        ip6stat.ip6s_badoptions++;
                    624:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    625:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    626:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    627:                                    ICMP6_PARAMPROB_HEADER,
                    628:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    629:                        return;
                    630:                }
1.9       itojun    631: #ifndef PULLDOWN_TEST
                    632:                /* ip6_hopopts_input() ensures that mbuf is contiguous */
                    633:                hbh = (struct ip6_hbh *)(ip6 + 1);
                    634: #else
                    635:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    636:                        sizeof(struct ip6_hbh));
                    637:                if (hbh == NULL) {
                    638:                        ip6stat.ip6s_tooshort++;
                    639:                        return;
                    640:                }
                    641: #endif
1.52.2.3! gehenna   642:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    643:                nxt = hbh->ip6h_nxt;
1.2       itojun    644:
                    645:                /*
                    646:                 * accept the packet if a router alert option is included
                    647:                 * and we act as an IPv6 router.
                    648:                 */
1.5       itojun    649:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    650:                        ours = 1;
                    651:        } else
                    652:                nxt = ip6->ip6_nxt;
                    653:
                    654:        /*
                    655:         * Check that the amount of data in the buffers
                    656:         * is as at least much as the IPv6 header would have us expect.
                    657:         * Trim mbufs if longer than we expect.
                    658:         * Drop packet if shorter than we expect.
                    659:         */
                    660:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    661:                ip6stat.ip6s_tooshort++;
1.9       itojun    662:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    663:                goto bad;
                    664:        }
                    665:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    666:                if (m->m_len == m->m_pkthdr.len) {
                    667:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    668:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    669:                } else
                    670:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    671:        }
                    672:
                    673:        /*
                    674:         * Forward if desirable.
                    675:         */
                    676:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    677:                /*
                    678:                 * If we are acting as a multicast router, all
                    679:                 * incoming multicast packets are passed to the
                    680:                 * kernel-level multicast forwarding function.
                    681:                 * The packet is returned (relatively) intact; if
                    682:                 * ip6_mforward() returns a non-zero value, the packet
                    683:                 * must be discarded, else it may be accepted below.
                    684:                 */
                    685:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    686:                        ip6stat.ip6s_cantforward++;
                    687:                        m_freem(m);
                    688:                        return;
                    689:                }
                    690:                if (!ours) {
                    691:                        m_freem(m);
                    692:                        return;
                    693:                }
1.22      itojun    694:        } else if (!ours) {
1.2       itojun    695:                ip6_forward(m, 0);
                    696:                return;
1.52.2.2  gehenna   697:        }
1.25      itojun    698:
                    699:        ip6 = mtod(m, struct ip6_hdr *);
                    700:
                    701:        /*
                    702:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    703:         * tcp/udp stack and bypass security checks (act as if it was from
                    704:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    705:         *
                    706:         * For SIIT end node behavior, you may want to disable the check.
                    707:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    708:         * source.
                    709:         */
                    710:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    711:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    712:                ip6stat.ip6s_badscope++;
                    713:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    714:                goto bad;
                    715:        }
1.2       itojun    716:
                    717:        /*
                    718:         * Tell launch routine the next header
                    719:         */
1.12      itojun    720: #ifdef IFA_STATS
1.28      itojun    721:        if (deliverifp != NULL) {
1.9       itojun    722:                struct in6_ifaddr *ia6;
                    723:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    724:                if (ia6)
                    725:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    726:        }
                    727: #endif
1.2       itojun    728:        ip6stat.ip6s_delivered++;
1.9       itojun    729:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    730:        nest = 0;
1.40      itojun    731:
1.2       itojun    732:        while (nxt != IPPROTO_DONE) {
                    733:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    734:                        ip6stat.ip6s_toomanyhdr++;
                    735:                        goto bad;
                    736:                }
1.8       itojun    737:
                    738:                /*
                    739:                 * protection against faulty packet - there should be
                    740:                 * more sanity checks in header chain processing.
                    741:                 */
                    742:                if (m->m_pkthdr.len < off) {
                    743:                        ip6stat.ip6s_tooshort++;
1.9       itojun    744:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    745:                        goto bad;
                    746:                }
                    747:
1.37      itojun    748: #ifdef IPSEC
                    749:                /*
                    750:                 * enforce IPsec policy checking if we are seeing last header.
                    751:                 * note that we do not visit this with protocols with pcb layer
                    752:                 * code - like udp/tcp/raw ip.
                    753:                 */
                    754:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    755:                    ipsec6_in_reject(m, NULL)) {
                    756:                        ipsec6stat.in_polvio++;
                    757:                        goto bad;
                    758:                }
                    759: #endif
1.52.2.2  gehenna   760:
1.2       itojun    761:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    762:        }
                    763:        return;
                    764:  bad:
                    765:        m_freem(m);
                    766: }
                    767:
                    768: /*
                    769:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    770:  * included, the real payload length will be stored in plenp.
                    771:  */
                    772: static int
                    773: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    774:        u_int32_t *plenp;
1.5       itojun    775:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    776:        struct mbuf **mp;
                    777:        int *offp;
                    778: {
1.35      itojun    779:        struct mbuf *m = *mp;
1.2       itojun    780:        int off = *offp, hbhlen;
                    781:        struct ip6_hbh *hbh;
                    782:        u_int8_t *opt;
                    783:
                    784:        /* validation of the length of the header */
1.9       itojun    785: #ifndef PULLDOWN_TEST
1.2       itojun    786:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
                    787:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    788:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    789:
                    790:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
                    791:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9       itojun    792: #else
                    793:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    794:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    795:        if (hbh == NULL) {
                    796:                ip6stat.ip6s_tooshort++;
                    797:                return -1;
                    798:        }
                    799:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    800:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    801:                hbhlen);
                    802:        if (hbh == NULL) {
                    803:                ip6stat.ip6s_tooshort++;
                    804:                return -1;
                    805:        }
                    806: #endif
1.52.2.3! gehenna   807:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    808:        off += hbhlen;
                    809:        hbhlen -= sizeof(struct ip6_hbh);
                    810:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    811:
                    812:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    813:                                hbhlen, rtalertp, plenp) < 0)
                    814:                return(-1);
                    815:
                    816:        *offp = off;
                    817:        *mp = m;
                    818:        return(0);
                    819: }
                    820:
                    821: /*
                    822:  * Search header for all Hop-by-hop options and process each option.
                    823:  * This function is separate from ip6_hopopts_input() in order to
                    824:  * handle a case where the sending node itself process its hop-by-hop
                    825:  * options header. In such a case, the function is called from ip6_output().
1.52.2.2  gehenna   826:  *
                    827:  * The function assumes that hbh header is located right after the IPv6 header
                    828:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    829:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    830:  */
                    831: int
                    832: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    833:        struct mbuf *m;
                    834:        u_int8_t *opthead;
                    835:        int hbhlen;
1.5       itojun    836:        u_int32_t *rtalertp;
1.2       itojun    837:        u_int32_t *plenp;
                    838: {
                    839:        struct ip6_hdr *ip6;
                    840:        int optlen = 0;
                    841:        u_int8_t *opt = opthead;
                    842:        u_int16_t rtalert_val;
1.22      itojun    843:        u_int32_t jumboplen;
1.52.2.2  gehenna   844:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    845:
                    846:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    847:                switch (*opt) {
                    848:                case IP6OPT_PAD1:
                    849:                        optlen = 1;
                    850:                        break;
                    851:                case IP6OPT_PADN:
                    852:                        if (hbhlen < IP6OPT_MINLEN) {
                    853:                                ip6stat.ip6s_toosmall++;
                    854:                                goto bad;
                    855:                        }
                    856:                        optlen = *(opt + 1) + 2;
                    857:                        break;
                    858:                case IP6OPT_RTALERT:
                    859:                        /* XXX may need check for alignment */
                    860:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    861:                                ip6stat.ip6s_toosmall++;
                    862:                                goto bad;
                    863:                        }
                    864:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.52.2.2  gehenna   865:                                /* XXX stat */
                    866:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    867:                                    ICMP6_PARAMPROB_HEADER,
                    868:                                    erroff + opt + 1 - opthead);
                    869:                                return (-1);
1.35      itojun    870:                        }
                    871:                        optlen = IP6OPT_RTALERT_LEN;
                    872:                        bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    873:                        *rtalertp = ntohs(rtalert_val);
                    874:                        break;
                    875:                case IP6OPT_JUMBO:
1.22      itojun    876:                        /* XXX may need check for alignment */
                    877:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    878:                                ip6stat.ip6s_toosmall++;
                    879:                                goto bad;
                    880:                        }
1.35      itojun    881:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.52.2.2  gehenna   882:                                /* XXX stat */
                    883:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    884:                                    ICMP6_PARAMPROB_HEADER,
                    885:                                    erroff + opt + 1 - opthead);
                    886:                                return (-1);
1.35      itojun    887:                        }
1.22      itojun    888:                        optlen = IP6OPT_JUMBO_LEN;
                    889:
                    890:                        /*
                    891:                         * IPv6 packets that have non 0 payload length
1.35      itojun    892:                         * must not contain a jumbo payload option.
1.22      itojun    893:                         */
                    894:                        ip6 = mtod(m, struct ip6_hdr *);
                    895:                        if (ip6->ip6_plen) {
                    896:                                ip6stat.ip6s_badoptions++;
                    897:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.52.2.2  gehenna   898:                                    ICMP6_PARAMPROB_HEADER,
                    899:                                    erroff + opt - opthead);
                    900:                                return (-1);
1.22      itojun    901:                        }
1.2       itojun    902:
1.22      itojun    903:                        /*
                    904:                         * We may see jumbolen in unaligned location, so
                    905:                         * we'd need to perform bcopy().
                    906:                         */
                    907:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    908:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    909:
                    910: #if 1
                    911:                        /*
                    912:                         * if there are multiple jumbo payload options,
                    913:                         * *plenp will be non-zero and the packet will be
                    914:                         * rejected.
                    915:                         * the behavior may need some debate in ipngwg -
                    916:                         * multiple options does not make sense, however,
                    917:                         * there's no explicit mention in specification.
                    918:                         */
                    919:                        if (*plenp != 0) {
                    920:                                ip6stat.ip6s_badoptions++;
                    921:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.52.2.2  gehenna   922:                                    ICMP6_PARAMPROB_HEADER,
                    923:                                    erroff + opt + 2 - opthead);
                    924:                                return (-1);
1.22      itojun    925:                        }
1.8       itojun    926: #endif
1.2       itojun    927:
1.22      itojun    928:                        /*
                    929:                         * jumbo payload length must be larger than 65535.
                    930:                         */
                    931:                        if (jumboplen <= IPV6_MAXPACKET) {
                    932:                                ip6stat.ip6s_badoptions++;
                    933:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.52.2.2  gehenna   934:                                    ICMP6_PARAMPROB_HEADER,
                    935:                                    erroff + opt + 2 - opthead);
                    936:                                return (-1);
1.22      itojun    937:                        }
                    938:                        *plenp = jumboplen;
                    939:
                    940:                        break;
1.35      itojun    941:                default:                /* unknown option */
                    942:                        if (hbhlen < IP6OPT_MINLEN) {
                    943:                                ip6stat.ip6s_toosmall++;
                    944:                                goto bad;
                    945:                        }
1.52.2.2  gehenna   946:                        optlen = ip6_unknown_opt(opt, m,
                    947:                            erroff + opt - opthead);
                    948:                        if (optlen == -1)
                    949:                                return (-1);
1.35      itojun    950:                        optlen += 2;
                    951:                        break;
1.2       itojun    952:                }
                    953:        }
                    954:
1.52.2.2  gehenna   955:        return (0);
1.2       itojun    956:
                    957:   bad:
                    958:        m_freem(m);
1.52.2.2  gehenna   959:        return (-1);
1.2       itojun    960: }
                    961:
                    962: /*
                    963:  * Unknown option processing.
                    964:  * The third argument `off' is the offset from the IPv6 header to the option,
                    965:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    966:  * is not continuous in order to return an ICMPv6 error.
                    967:  */
                    968: int
                    969: ip6_unknown_opt(optp, m, off)
                    970:        u_int8_t *optp;
                    971:        struct mbuf *m;
                    972:        int off;
                    973: {
                    974:        struct ip6_hdr *ip6;
                    975:
1.35      itojun    976:        switch (IP6OPT_TYPE(*optp)) {
                    977:        case IP6OPT_TYPE_SKIP: /* ignore the option */
                    978:                return((int)*(optp + 1));
                    979:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                    980:                m_freem(m);
                    981:                return(-1);
                    982:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    983:                ip6stat.ip6s_badoptions++;
                    984:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
                    985:                return(-1);
                    986:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    987:                ip6stat.ip6s_badoptions++;
                    988:                ip6 = mtod(m, struct ip6_hdr *);
                    989:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    990:                    (m->m_flags & (M_BCAST|M_MCAST)))
                    991:                        m_freem(m);
                    992:                else
                    993:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    994:                                    ICMP6_PARAMPROB_OPTION, off);
                    995:                return(-1);
1.2       itojun    996:        }
                    997:
                    998:        m_freem(m);             /* XXX: NOTREACHED */
                    999:        return(-1);
                   1000: }
                   1001:
                   1002: /*
1.9       itojun   1003:  * Create the "control" list for this pcb.
                   1004:  *
                   1005:  * The routine will be called from upper layer handlers like tcp6_input().
                   1006:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1007:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1008:  * very first mbuf on the mbuf chain.
                   1009:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1010:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1011:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1012:  */
                   1013: void
                   1014: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun   1015:        struct in6pcb *in6p;
                   1016:        struct mbuf **mp;
                   1017:        struct ip6_hdr *ip6;
                   1018:        struct mbuf *m;
1.2       itojun   1019: {
                   1020:        struct proc *p = curproc;       /* XXX */
1.9       itojun   1021:        int privileged;
1.2       itojun   1022:
1.9       itojun   1023:        privileged = 0;
                   1024:        if (p && !suser(p->p_ucred, &p->p_acflag))
                   1025:                privileged++;
                   1026:
                   1027: #ifdef SO_TIMESTAMP
1.2       itojun   1028:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1029:                struct timeval tv;
                   1030:
                   1031:                microtime(&tv);
                   1032:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1033:                        SCM_TIMESTAMP, SOL_SOCKET);
                   1034:                if (*mp)
                   1035:                        mp = &(*mp)->m_next;
                   1036:        }
1.9       itojun   1037: #endif
1.2       itojun   1038:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                   1039:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
                   1040:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
                   1041:                        IPPROTO_IPV6);
                   1042:                if (*mp)
                   1043:                        mp = &(*mp)->m_next;
                   1044:        }
                   1045:
                   1046: #ifdef noyet
                   1047:        /* options were tossed above */
                   1048:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                   1049:                /* broken */
                   1050:        /* ip6_srcroute doesn't do what we want here, need to fix */
                   1051:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                   1052:                /* broken */
                   1053: #endif
                   1054:
                   1055:        /* RFC 2292 sec. 5 */
1.35      itojun   1056:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1057:                struct in6_pktinfo pi6;
                   1058:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                   1059:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                   1060:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                   1061:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                   1062:                                        ? m->m_pkthdr.rcvif->if_index
                   1063:                                        : 0;
                   1064:                *mp = sbcreatecontrol((caddr_t) &pi6,
                   1065:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
                   1066:                        IPPROTO_IPV6);
                   1067:                if (*mp)
                   1068:                        mp = &(*mp)->m_next;
                   1069:        }
                   1070:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1071:                int hlim = ip6->ip6_hlim & 0xff;
                   1072:                *mp = sbcreatecontrol((caddr_t) &hlim,
                   1073:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
                   1074:                if (*mp)
                   1075:                        mp = &(*mp)->m_next;
                   1076:        }
                   1077:        /* IN6P_NEXTHOP - for outgoing packet only */
                   1078:
                   1079:        /*
                   1080:         * IPV6_HOPOPTS socket option. We require super-user privilege
                   1081:         * for the option, but it might be too strict, since there might
                   1082:         * be some hop-by-hop options which can be returned to normal user.
                   1083:         * See RFC 2292 section 6.
                   1084:         */
1.35      itojun   1085:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2       itojun   1086:                /*
                   1087:                 * Check if a hop-by-hop options header is contatined in the
                   1088:                 * received packet, and if so, store the options as ancillary
                   1089:                 * data. Note that a hop-by-hop options header must be
                   1090:                 * just after the IPv6 header, which fact is assured through
                   1091:                 * the IPv6 input processing.
                   1092:                 */
                   1093:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1094:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1095:                        struct ip6_hbh *hbh;
                   1096:                        int hbhlen;
                   1097:
                   1098: #ifndef PULLDOWN_TEST
                   1099:                        hbh = (struct ip6_hbh *)(ip6 + 1);
                   1100:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1101: #else
                   1102:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1103:                                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                   1104:                        if (hbh == NULL) {
                   1105:                                ip6stat.ip6s_tooshort++;
                   1106:                                return;
                   1107:                        }
                   1108:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1109:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1110:                                sizeof(struct ip6_hdr), hbhlen);
                   1111:                        if (hbh == NULL) {
                   1112:                                ip6stat.ip6s_tooshort++;
                   1113:                                return;
                   1114:                        }
                   1115: #endif
1.2       itojun   1116:
                   1117:                        /*
                   1118:                         * XXX: We copy whole the header even if a jumbo
                   1119:                         * payload option is included, which option is to
                   1120:                         * be removed before returning in the RFC 2292.
                   1121:                         * But it's too painful operation...
                   1122:                         */
1.9       itojun   1123:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2       itojun   1124:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
                   1125:                        if (*mp)
                   1126:                                mp = &(*mp)->m_next;
                   1127:                }
                   1128:        }
                   1129:
                   1130:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1131:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1132:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1133:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
                   1134:
                   1135:                /*
                   1136:                 * Search for destination options headers or routing
                   1137:                 * header(s) through the header chain, and stores each
                   1138:                 * header as ancillary data.
                   1139:                 * Note that the order of the headers remains in
                   1140:                 * the chain of ancillary data.
                   1141:                 */
1.35      itojun   1142:                while (1) {     /* is explicit loop prevention necessary? */
1.9       itojun   1143:                        struct ip6_ext *ip6e;
                   1144:                        int elen;
                   1145:
                   1146: #ifndef PULLDOWN_TEST
                   1147:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
                   1148:                        if (nxt == IPPROTO_AH)
                   1149:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1150:                        else
                   1151:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1152: #else
                   1153:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
                   1154:                                sizeof(struct ip6_ext));
                   1155:                        if (ip6e == NULL) {
                   1156:                                ip6stat.ip6s_tooshort++;
                   1157:                                return;
                   1158:                        }
                   1159:                        if (nxt == IPPROTO_AH)
                   1160:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1161:                        else
                   1162:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1163:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
                   1164:                        if (ip6e == NULL) {
                   1165:                                ip6stat.ip6s_tooshort++;
                   1166:                                return;
                   1167:                        }
                   1168: #endif
1.52.2.3! gehenna  1169:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1170:
1.35      itojun   1171:                        switch (nxt) {
                   1172:                        case IPPROTO_DSTOPTS:
                   1173:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1174:                                        break;
                   1175:
                   1176:                                /*
                   1177:                                 * We also require super-user privilege for
                   1178:                                 * the option.
                   1179:                                 * See the comments on IN6_HOPOPTS.
                   1180:                                 */
                   1181:                                if (!privileged)
                   1182:                                        break;
                   1183:
                   1184:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1185:                                                      IPV6_DSTOPTS,
                   1186:                                                      IPPROTO_IPV6);
                   1187:                                if (*mp)
                   1188:                                        mp = &(*mp)->m_next;
                   1189:                                break;
                   1190:
                   1191:                        case IPPROTO_ROUTING:
                   1192:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1193:                                        break;
                   1194:
                   1195:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1196:                                                      IPV6_RTHDR,
                   1197:                                                      IPPROTO_IPV6);
                   1198:                                if (*mp)
                   1199:                                        mp = &(*mp)->m_next;
                   1200:                                break;
                   1201:
                   1202:                        case IPPROTO_UDP:
                   1203:                        case IPPROTO_TCP:
                   1204:                        case IPPROTO_ICMPV6:
                   1205:                        default:
                   1206:                                /*
                   1207:                                 * stop search if we encounter an upper
                   1208:                                 * layer protocol headers.
                   1209:                                 */
                   1210:                                goto loopend;
                   1211:
                   1212:                        case IPPROTO_HOPOPTS:
                   1213:                        case IPPROTO_AH: /* is it possible? */
                   1214:                                break;
1.2       itojun   1215:                        }
                   1216:
                   1217:                        /* proceed with the next header. */
1.9       itojun   1218:                        off += elen;
1.2       itojun   1219:                        nxt = ip6e->ip6e_nxt;
                   1220:                }
                   1221:          loopend:
1.36      cgd      1222:                ;
1.2       itojun   1223:        }
1.9       itojun   1224:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun   1225:                /* to be done */
                   1226:        }
1.9       itojun   1227:        if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2       itojun   1228:                /* to be done */
                   1229:        }
                   1230:        /* IN6P_RTHDR - to be done */
                   1231:
                   1232: }
                   1233:
                   1234: /*
                   1235:  * Get pointer to the previous header followed by the header
                   1236:  * currently processed.
                   1237:  * XXX: This function supposes that
                   1238:  *     M includes all headers,
                   1239:  *     the next header field and the header length field of each header
                   1240:  *     are valid, and
                   1241:  *     the sum of each header length equals to OFF.
                   1242:  * Because of these assumptions, this function must be called very
                   1243:  * carefully. Moreover, it will not be used in the near future when
                   1244:  * we develop `neater' mechanism to process extension headers.
                   1245:  */
                   1246: char *
                   1247: ip6_get_prevhdr(m, off)
                   1248:        struct mbuf *m;
                   1249:        int off;
                   1250: {
                   1251:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1252:
                   1253:        if (off == sizeof(struct ip6_hdr))
                   1254:                return(&ip6->ip6_nxt);
                   1255:        else {
                   1256:                int len, nxt;
                   1257:                struct ip6_ext *ip6e = NULL;
                   1258:
                   1259:                nxt = ip6->ip6_nxt;
                   1260:                len = sizeof(struct ip6_hdr);
                   1261:                while (len < off) {
                   1262:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1263:
1.35      itojun   1264:                        switch (nxt) {
1.2       itojun   1265:                        case IPPROTO_FRAGMENT:
                   1266:                                len += sizeof(struct ip6_frag);
                   1267:                                break;
                   1268:                        case IPPROTO_AH:
                   1269:                                len += (ip6e->ip6e_len + 2) << 2;
                   1270:                                break;
                   1271:                        default:
                   1272:                                len += (ip6e->ip6e_len + 1) << 3;
                   1273:                                break;
                   1274:                        }
                   1275:                        nxt = ip6e->ip6e_nxt;
                   1276:                }
                   1277:                if (ip6e)
                   1278:                        return(&ip6e->ip6e_nxt);
                   1279:                else
                   1280:                        return NULL;
1.18      itojun   1281:        }
                   1282: }
                   1283:
                   1284: /*
                   1285:  * get next header offset.  m will be retained.
                   1286:  */
                   1287: int
                   1288: ip6_nexthdr(m, off, proto, nxtp)
                   1289:        struct mbuf *m;
                   1290:        int off;
                   1291:        int proto;
                   1292:        int *nxtp;
                   1293: {
                   1294:        struct ip6_hdr ip6;
                   1295:        struct ip6_ext ip6e;
                   1296:        struct ip6_frag fh;
                   1297:
                   1298:        /* just in case */
                   1299:        if (m == NULL)
                   1300:                panic("ip6_nexthdr: m == NULL");
                   1301:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1302:                return -1;
                   1303:
                   1304:        switch (proto) {
                   1305:        case IPPROTO_IPV6:
                   1306:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1307:                        return -1;
                   1308:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1309:                if (nxtp)
                   1310:                        *nxtp = ip6.ip6_nxt;
                   1311:                off += sizeof(ip6);
                   1312:                return off;
                   1313:
                   1314:        case IPPROTO_FRAGMENT:
                   1315:                /*
                   1316:                 * terminate parsing if it is not the first fragment,
                   1317:                 * it does not make sense to parse through it.
                   1318:                 */
                   1319:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1320:                        return -1;
                   1321:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
                   1322:                if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
                   1323:                        return -1;
                   1324:                if (nxtp)
                   1325:                        *nxtp = fh.ip6f_nxt;
                   1326:                off += sizeof(struct ip6_frag);
                   1327:                return off;
                   1328:
                   1329:        case IPPROTO_AH:
                   1330:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1331:                        return -1;
                   1332:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1333:                if (nxtp)
                   1334:                        *nxtp = ip6e.ip6e_nxt;
                   1335:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1336:                if (m->m_pkthdr.len < off)
                   1337:                        return -1;
1.18      itojun   1338:                return off;
                   1339:
                   1340:        case IPPROTO_HOPOPTS:
                   1341:        case IPPROTO_ROUTING:
                   1342:        case IPPROTO_DSTOPTS:
                   1343:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1344:                        return -1;
                   1345:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1346:                if (nxtp)
                   1347:                        *nxtp = ip6e.ip6e_nxt;
                   1348:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1349:                if (m->m_pkthdr.len < off)
                   1350:                        return -1;
1.18      itojun   1351:                return off;
                   1352:
                   1353:        case IPPROTO_NONE:
                   1354:        case IPPROTO_ESP:
                   1355:        case IPPROTO_IPCOMP:
                   1356:                /* give up */
                   1357:                return -1;
                   1358:
                   1359:        default:
                   1360:                return -1;
                   1361:        }
                   1362:
                   1363:        return -1;
                   1364: }
                   1365:
                   1366: /*
                   1367:  * get offset for the last header in the chain.  m will be kept untainted.
                   1368:  */
                   1369: int
                   1370: ip6_lasthdr(m, off, proto, nxtp)
                   1371:        struct mbuf *m;
                   1372:        int off;
                   1373:        int proto;
                   1374:        int *nxtp;
                   1375: {
                   1376:        int newoff;
                   1377:        int nxt;
                   1378:
                   1379:        if (!nxtp) {
                   1380:                nxt = -1;
                   1381:                nxtp = &nxt;
                   1382:        }
                   1383:        while (1) {
                   1384:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1385:                if (newoff < 0)
                   1386:                        return off;
                   1387:                else if (newoff < off)
                   1388:                        return -1;      /* invalid */
                   1389:                else if (newoff == off)
                   1390:                        return newoff;
                   1391:
                   1392:                off = newoff;
                   1393:                proto = *nxtp;
1.2       itojun   1394:        }
                   1395: }
                   1396:
                   1397: /*
                   1398:  * System control for IP6
                   1399:  */
                   1400:
                   1401: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1402:        0,              0,              0,              0,
                   1403:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1404:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1405:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1406:        0,              0,              0,              0,
                   1407:        ENOPROTOOPT
                   1408: };
                   1409:
                   1410: int
                   1411: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1412:        int *name;
                   1413:        u_int namelen;
                   1414:        void *oldp;
                   1415:        size_t *oldlenp;
                   1416:        void *newp;
                   1417:        size_t newlen;
                   1418: {
1.26      itojun   1419:        int old, error;
                   1420:
1.2       itojun   1421:        /* All sysctl names at this level are terminal. */
                   1422:        if (namelen != 1)
                   1423:                return ENOTDIR;
                   1424:
                   1425:        switch (name[0]) {
                   1426:
                   1427:        case IPV6CTL_FORWARDING:
                   1428:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1429:                                  &ip6_forwarding);
                   1430:        case IPV6CTL_SENDREDIRECTS:
                   1431:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1432:                                &ip6_sendredirects);
                   1433:        case IPV6CTL_DEFHLIM:
                   1434:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                   1435:        case IPV6CTL_MAXFRAGPACKETS:
                   1436:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1437:                                &ip6_maxfragpackets);
                   1438:        case IPV6CTL_ACCEPT_RTADV:
                   1439:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1440:                                &ip6_accept_rtadv);
                   1441:        case IPV6CTL_KEEPFAITH:
                   1442:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                   1443:        case IPV6CTL_LOG_INTERVAL:
                   1444:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1445:                                &ip6_log_interval);
                   1446:        case IPV6CTL_HDRNESTLIMIT:
                   1447:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1448:                                &ip6_hdrnestlimit);
                   1449:        case IPV6CTL_DAD_COUNT:
                   1450:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1451:        case IPV6CTL_AUTO_FLOWLABEL:
                   1452:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1453:                                &ip6_auto_flowlabel);
                   1454:        case IPV6CTL_DEFMCASTHLIM:
                   1455:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1456:                                &ip6_defmcasthlim);
1.51      itojun   1457: #if NGIF > 0
1.2       itojun   1458:        case IPV6CTL_GIF_HLIM:
                   1459:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1460:                                &ip6_gif_hlim);
1.51      itojun   1461: #endif
1.2       itojun   1462:        case IPV6CTL_KAME_VERSION:
                   1463:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9       itojun   1464:        case IPV6CTL_USE_DEPRECATED:
                   1465:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1466:                                &ip6_use_deprecated);
1.10      itojun   1467:        case IPV6CTL_RR_PRUNE:
                   1468:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.43      itojun   1469:        case IPV6CTL_V6ONLY:
                   1470: #ifdef INET6_BINDV6ONLY
                   1471:                return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
                   1472: #else
                   1473:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26      itojun   1474: #endif
                   1475:        case IPV6CTL_ANONPORTMIN:
                   1476:                old = ip6_anonportmin;
                   1477:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1478:                    &ip6_anonportmin);
                   1479:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
                   1480:                    ip6_anonportmin > 65535
                   1481: #ifndef IPNOPRIVPORTS
                   1482:                    || ip6_anonportmin < IPV6PORT_RESERVED
                   1483: #endif
                   1484:                    ) {
                   1485:                        ip6_anonportmin = old;
                   1486:                        return (EINVAL);
                   1487:                }
                   1488:                return (error);
                   1489:        case IPV6CTL_ANONPORTMAX:
                   1490:                old = ip6_anonportmax;
                   1491:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1492:                    &ip6_anonportmax);
                   1493:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
                   1494:                    ip6_anonportmax > 65535
                   1495: #ifndef IPNOPRIVPORTS
                   1496:                    || ip6_anonportmax < IPV6PORT_RESERVED
                   1497: #endif
                   1498:                    ) {
                   1499:                        ip6_anonportmax = old;
                   1500:                        return (EINVAL);
                   1501:                }
                   1502:                return (error);
                   1503: #ifndef IPNOPRIVPORTS
                   1504:        case IPV6CTL_LOWPORTMIN:
                   1505:                old = ip6_lowportmin;
                   1506:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1507:                    &ip6_lowportmin);
                   1508:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1509:                    ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
                   1510:                    ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
                   1511:                        ip6_lowportmin = old;
                   1512:                        return (EINVAL);
                   1513:                }
                   1514:                return (error);
                   1515:        case IPV6CTL_LOWPORTMAX:
                   1516:                old = ip6_lowportmax;
                   1517:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1518:                    &ip6_lowportmax);
                   1519:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1520:                    ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
                   1521:                    ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
                   1522:                        ip6_lowportmax = old;
                   1523:                        return (EINVAL);
                   1524:                }
                   1525:                return (error);
1.11      itojun   1526: #endif
1.52.2.1  gehenna  1527:        case IPV6CTL_MAXFRAGS:
                   1528:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
1.2       itojun   1529:        default:
                   1530:                return EOPNOTSUPP;
                   1531:        }
                   1532:        /* NOTREACHED */
                   1533: }

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