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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.65

1.65    ! agc         1: /*     $NetBSD: ip6_input.c,v 1.64 2003/06/30 08:00:59 itojun 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.
1.65    ! agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.65    ! agc        65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.64 2003/06/30 08:00:59 itojun Exp $");
1.2       itojun     66:
                     67: #include "opt_inet.h"
1.4       thorpej    68: #include "opt_ipsec.h"
1.15      darrenr    69: #include "opt_pfil_hooks.h"
1.2       itojun     70:
                     71: #include <sys/param.h>
                     72: #include <sys/systm.h>
                     73: #include <sys/malloc.h>
                     74: #include <sys/mbuf.h>
                     75: #include <sys/domain.h>
                     76: #include <sys/protosw.h>
                     77: #include <sys/socket.h>
                     78: #include <sys/socketvar.h>
                     79: #include <sys/errno.h>
                     80: #include <sys/time.h>
                     81: #include <sys/kernel.h>
                     82: #include <sys/syslog.h>
                     83: #include <sys/proc.h>
1.46      simonb     84: #include <sys/sysctl.h>
1.2       itojun     85:
                     86: #include <net/if.h>
                     87: #include <net/if_types.h>
                     88: #include <net/if_dl.h>
                     89: #include <net/route.h>
                     90: #include <net/netisr.h>
1.15      darrenr    91: #ifdef PFIL_HOOKS
                     92: #include <net/pfil.h>
                     93: #endif
1.2       itojun     94:
                     95: #include <netinet/in.h>
1.9       itojun     96: #include <netinet/in_systm.h>
                     97: #ifdef INET
                     98: #include <netinet/ip.h>
                     99: #include <netinet/ip_icmp.h>
1.45      itojun    100: #endif /* INET */
1.14      itojun    101: #include <netinet/ip6.h>
1.2       itojun    102: #include <netinet6/in6_var.h>
1.11      itojun    103: #include <netinet6/ip6_var.h>
1.2       itojun    104: #include <netinet6/in6_pcb.h>
1.14      itojun    105: #include <netinet/icmp6.h>
1.2       itojun    106: #include <netinet6/in6_ifattach.h>
                    107: #include <netinet6/nd6.h>
                    108:
1.37      itojun    109: #ifdef IPSEC
                    110: #include <netinet6/ipsec.h>
                    111: #endif
                    112:
1.2       itojun    113: #include <netinet6/ip6protosw.h>
                    114:
                    115: /* we need it for NLOOP. */
                    116: #include "loop.h"
                    117: #include "faith.h"
                    118: #include "gif.h"
                    119: #include "bpfilter.h"
1.50      itojun    120:
                    121: #if NGIF > 0
                    122: #include <netinet6/in6_gif.h>
                    123: #endif
1.2       itojun    124:
1.9       itojun    125: #include <net/net_osdep.h>
                    126:
1.2       itojun    127: extern struct domain inet6domain;
                    128:
                    129: u_char ip6_protox[IPPROTO_MAX];
                    130: static int ip6qmaxlen = IFQ_MAXLEN;
                    131: struct in6_ifaddr *in6_ifaddr;
                    132: struct ifqueue ip6intrq;
                    133:
                    134: extern struct ifnet loif[NLOOP];
                    135: int ip6_forward_srcrt;                 /* XXX */
                    136: int ip6_sourcecheck;                   /* XXX */
                    137: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    138:
1.29      thorpej   139: #ifdef PFIL_HOOKS
                    140: struct pfil_head inet6_pfil_hook;
                    141: #endif
                    142:
1.2       itojun    143: struct ip6stat ip6stat;
                    144:
                    145: static void ip6_init2 __P((void *));
                    146:
1.5       itojun    147: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.62      itojun    148: static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int));
1.2       itojun    149:
                    150: /*
                    151:  * IP6 initialization: fill in IP6 protocol switch table.
                    152:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    153:  */
                    154: void
                    155: ip6_init()
                    156: {
1.35      itojun    157:        struct ip6protosw *pr;
                    158:        int i;
1.2       itojun    159:
                    160:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    161:        if (pr == 0)
                    162:                panic("ip6_init");
                    163:        for (i = 0; i < IPPROTO_MAX; i++)
                    164:                ip6_protox[i] = pr - inet6sw;
                    165:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    166:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    167:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    168:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    169:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    170:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    171:        nd6_init();
                    172:        frag6_init();
1.54      itojun    173:        ip6_flow_seq = arc4random();
1.2       itojun    174:
                    175:        ip6_init2((void *)0);
1.29      thorpej   176:
                    177: #ifdef PFIL_HOOKS
                    178:        /* Register our Packet Filter hook. */
1.33      thorpej   179:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    180:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   181:        i = pfil_head_register(&inet6_pfil_hook);
                    182:        if (i != 0)
                    183:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    184:                    "error %d\n", i);
                    185: #endif /* PFIL_HOOKS */
1.2       itojun    186: }
                    187:
                    188: static void
                    189: ip6_init2(dummy)
                    190:        void *dummy;
                    191: {
                    192:
                    193:        /* nd6_timer_init */
1.19      thorpej   194:        callout_init(&nd6_timer_ch);
                    195:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.2       itojun    196: }
                    197:
                    198: /*
                    199:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    200:  */
                    201: void
                    202: ip6intr()
                    203: {
                    204:        int s;
                    205:        struct mbuf *m;
                    206:
                    207:        for (;;) {
1.41      thorpej   208:                s = splnet();
1.2       itojun    209:                IF_DEQUEUE(&ip6intrq, m);
                    210:                splx(s);
                    211:                if (m == 0)
                    212:                        return;
                    213:                ip6_input(m);
                    214:        }
                    215: }
                    216:
                    217: extern struct  route_in6 ip6_forward_rt;
                    218:
                    219: void
                    220: ip6_input(m)
                    221:        struct mbuf *m;
                    222: {
1.9       itojun    223:        struct ip6_hdr *ip6;
1.2       itojun    224:        int off = sizeof(struct ip6_hdr), nest;
                    225:        u_int32_t plen;
1.5       itojun    226:        u_int32_t rtalert = ~0;
1.2       itojun    227:        int nxt, ours = 0;
1.9       itojun    228:        struct ifnet *deliverifp = NULL;
1.64      itojun    229:        int srcrt = 0;
1.2       itojun    230:
                    231: #ifdef IPSEC
                    232:        /*
                    233:         * should the inner packet be considered authentic?
                    234:         * see comment in ah4_input().
                    235:         */
1.49      itojun    236:        m->m_flags &= ~M_AUTHIPHDR;
                    237:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    238: #endif
1.9       itojun    239:
1.2       itojun    240:        /*
1.44      itojun    241:         * mbuf statistics
1.2       itojun    242:         */
                    243:        if (m->m_flags & M_EXT) {
                    244:                if (m->m_next)
                    245:                        ip6stat.ip6s_mext2m++;
                    246:                else
                    247:                        ip6stat.ip6s_mext1++;
                    248:        } else {
1.40      itojun    249: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2       itojun    250:                if (m->m_next) {
1.9       itojun    251:                        if (m->m_flags & M_LOOP) {
1.44      itojun    252:                                ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40      itojun    253:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    254:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    255:                        else
                    256:                                ip6stat.ip6s_m2m[0]++;
                    257:                } else
                    258:                        ip6stat.ip6s_m1++;
1.40      itojun    259: #undef M2MMAX
1.2       itojun    260:        }
                    261:
1.9       itojun    262:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    263:        ip6stat.ip6s_total++;
                    264:
1.57      thorpej   265:        /*
                    266:         * If the IPv6 header is not aligned, slurp it up into a new
                    267:         * mbuf with space for link headers, in the event we forward
                    268:         * it.  OTherwise, if it is aligned, make sure the entire base
                    269:         * IPv6 header is in the first mbuf of the chain.
                    270:         */
                    271:        if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    272:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    273:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    274:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    275:                        /* XXXJRT new stat, please */
                    276:                        ip6stat.ip6s_toosmall++;
                    277:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    278:                        return;
                    279:                }
                    280:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    281:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    282:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9       itojun    283:                        ip6stat.ip6s_toosmall++;
                    284:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    285:                        return;
                    286:                }
1.2       itojun    287:        }
                    288:
                    289:        ip6 = mtod(m, struct ip6_hdr *);
                    290:
                    291:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    292:                ip6stat.ip6s_badvers++;
1.9       itojun    293:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    294:                goto bad;
                    295:        }
1.15      darrenr   296:
                    297: #ifdef PFIL_HOOKS
                    298:        /*
                    299:         * Run through list of hooks for input packets.  If there are any
                    300:         * filters which require that additional packets in the flow are
                    301:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    302:         * Note that filters must _never_ set this flag, as another filter
                    303:         * in the list may have previously cleared it.
                    304:         */
1.39      itojun    305:        /*
                    306:         * let ipfilter look at packet on the wire,
                    307:         * not the decapsulated packet.
                    308:         */
                    309: #ifdef IPSEC
1.42      itojun    310:        if (!ipsec_getnhist(m))
1.39      itojun    311: #else
                    312:        if (1)
                    313: #endif
                    314:        {
1.64      itojun    315:                struct in6_addr odst;
                    316:
                    317:                odst = ip6->ip6_dst;
1.39      itojun    318:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    319:                                   PFIL_IN) != 0)
                    320:                        return;
                    321:                if (m == NULL)
                    322:                        return;
                    323:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    324:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    325:        }
1.15      darrenr   326: #endif /* PFIL_HOOKS */
                    327:
1.2       itojun    328:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    329:
1.30      thorpej   330: #ifdef ALTQ
                    331:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    332:                /* packet is dropped by traffic conditioner */
                    333:                return;
1.9       itojun    334:        }
                    335: #endif
                    336:
1.2       itojun    337:        /*
1.44      itojun    338:         * Check against address spoofing/corruption.
1.2       itojun    339:         */
                    340:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    341:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    342:                /*
                    343:                 * XXX: "badscope" is not very suitable for a multicast source.
                    344:                 */
1.2       itojun    345:                ip6stat.ip6s_badscope++;
1.9       itojun    346:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    347:                goto bad;
                    348:        }
1.13      itojun    349:        /*
1.44      itojun    350:         * The following check is not documented in specs.  A malicious
                    351:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    352:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    353:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    354:         *
1.44      itojun    355:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    356:         * support IPv4-less kernel compilation, we cannot support SIIT
                    357:         * environment at all.  So, it makes more sense for us to reject any
                    358:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       359:         * partial support for SIIT environment.
1.13      itojun    360:         */
                    361:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    362:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    363:                ip6stat.ip6s_badscope++;
                    364:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    365:                goto bad;
                    366:        }
1.17      itojun    367: #if 0
1.13      itojun    368:        /*
1.17      itojun    369:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    370:         *
                    371:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    372:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    373:         * is revised to forbid relaying case.
1.13      itojun    374:         */
                    375:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    376:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    377:                ip6stat.ip6s_badscope++;
                    378:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    379:                goto bad;
                    380:        }
                    381: #endif
1.35      itojun    382:
1.2       itojun    383:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    384:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    385:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    386:                        ours = 1;
1.9       itojun    387:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    388:                        goto hbhcheck;
                    389:                } else {
                    390:                        ip6stat.ip6s_badscope++;
1.9       itojun    391:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    392:                        goto bad;
                    393:                }
                    394:        }
                    395:
1.38      itojun    396:        /* drop packets if interface ID portion is already filled */
                    397:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    398:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
                    399:                    ip6->ip6_src.s6_addr16[1]) {
                    400:                        ip6stat.ip6s_badscope++;
                    401:                        goto bad;
                    402:                }
                    403:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
                    404:                    ip6->ip6_dst.s6_addr16[1]) {
                    405:                        ip6stat.ip6s_badscope++;
                    406:                        goto bad;
                    407:                }
                    408:        }
1.2       itojun    409:
1.40      itojun    410:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    411:                ip6->ip6_src.s6_addr16[1]
                    412:                        = htons(m->m_pkthdr.rcvif->if_index);
                    413:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    414:                ip6->ip6_dst.s6_addr16[1]
                    415:                        = htons(m->m_pkthdr.rcvif->if_index);
                    416:
                    417:        /*
                    418:         * We use rt->rt_ifp to determine if the address is ours or not.
                    419:         * If rt_ifp is lo0, the address is ours.
                    420:         * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
                    421:         * so any address under fe80::%lo0/64 will be mistakenly considered
                    422:         * local.  The special case is supplied to handle the case properly
                    423:         * by actually looking at interface addresses
                    424:         * (using in6ifa_ifpwithaddr).
                    425:         */
                    426:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
                    427:            IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    428:                if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
                    429:                        icmp6_error(m, ICMP6_DST_UNREACH,
                    430:                            ICMP6_DST_UNREACH_ADDR, 0);
                    431:                        /* m is already freed */
                    432:                        return;
1.21      itojun    433:                }
1.40      itojun    434:
                    435:                ours = 1;
                    436:                deliverifp = m->m_pkthdr.rcvif;
                    437:                goto hbhcheck;
1.9       itojun    438:        }
                    439:
1.2       itojun    440:        /*
                    441:         * Multicast check
                    442:         */
                    443:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    444:                struct  in6_multi *in6m = 0;
1.9       itojun    445:
                    446:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    447:                /*
                    448:                 * See if we belong to the destination multicast group on the
                    449:                 * arrival interface.
                    450:                 */
                    451:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    452:                if (in6m)
                    453:                        ours = 1;
                    454:                else if (!ip6_mrouter) {
                    455:                        ip6stat.ip6s_notmember++;
                    456:                        ip6stat.ip6s_cantforward++;
1.9       itojun    457:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    458:                        goto bad;
                    459:                }
1.9       itojun    460:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    461:                goto hbhcheck;
                    462:        }
                    463:
                    464:        /*
                    465:         *  Unicast check
                    466:         */
1.22      itojun    467:        if (ip6_forward_rt.ro_rt != NULL &&
1.55      itojun    468:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
1.22      itojun    469:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35      itojun    470:                               &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25      itojun    471:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    472:        else {
1.35      itojun    473:                struct sockaddr_in6 *dst6;
                    474:
1.2       itojun    475:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    476:                        /* route is down or destination is different */
1.25      itojun    477:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    478:                        RTFREE(ip6_forward_rt.ro_rt);
                    479:                        ip6_forward_rt.ro_rt = 0;
                    480:                }
1.22      itojun    481:
1.2       itojun    482:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35      itojun    483:                dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
                    484:                dst6->sin6_len = sizeof(struct sockaddr_in6);
                    485:                dst6->sin6_family = AF_INET6;
                    486:                dst6->sin6_addr = ip6->ip6_dst;
1.2       itojun    487:
1.9       itojun    488:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    489:        }
                    490:
                    491: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    492:
                    493:        /*
                    494:         * Accept the packet if the forwarding interface to the destination
                    495:         * according to the routing table is the loopback interface,
                    496:         * unless the associated route has a gateway.
                    497:         * Note that this approach causes to accept a packet if there is a
                    498:         * route to the loopback interface for the destination of the packet.
                    499:         * But we think it's even useful in some situations, e.g. when using
                    500:         * a special daemon which wants to intercept the packet.
                    501:         */
                    502:        if (ip6_forward_rt.ro_rt &&
                    503:            (ip6_forward_rt.ro_rt->rt_flags &
                    504:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.55      itojun    505:            !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2       itojun    506: #if 0
                    507:            /*
                    508:             * The check below is redundant since the comparison of
                    509:             * the destination and the key of the rtentry has
                    510:             * already done through looking up the routing table.
                    511:             */
                    512:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.55      itojun    513:            &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2       itojun    514: #endif
1.9       itojun    515:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    516:                struct in6_ifaddr *ia6 =
                    517:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    518:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    519:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    520:                /*
                    521:                 * packets to a tentative, duplicated, or somehow invalid
                    522:                 * address must not be accepted.
                    523:                 */
1.2       itojun    524:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    525:                        /* this address is ready */
1.2       itojun    526:                        ours = 1;
1.9       itojun    527:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    528:                        goto hbhcheck;
                    529:                } else {
1.24      itojun    530:                        /* address is not ready, so discard the packet. */
1.34      itojun    531:                        nd6log((LOG_INFO,
1.27      itojun    532:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    533:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    534:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    535:
                    536:                        goto bad;
1.2       itojun    537:                }
                    538:        }
                    539:
                    540:        /*
1.55      itojun    541:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    542:         */
                    543: #if defined(NFAITH) && 0 < NFAITH
                    544:        if (ip6_keepfaith) {
                    545:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    546:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    547:                        /* XXX do we need more sanity checks? */
                    548:                        ours = 1;
1.45      itojun    549:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9       itojun    550:                        goto hbhcheck;
                    551:                }
                    552:        }
                    553: #endif
                    554:
                    555: #if 0
                    556:     {
                    557:        /*
                    558:         * Last resort: check in6_ifaddr for incoming interface.
                    559:         * The code is here until I update the "goto ours hack" code above
                    560:         * working right.
                    561:         */
                    562:        struct ifaddr *ifa;
                    563:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    564:             ifa;
                    565:             ifa = ifa->ifa_list.tqe_next) {
                    566:                if (ifa->ifa_addr == NULL)
                    567:                        continue;       /* just for safety */
                    568:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    569:                        continue;
                    570:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    571:                        ours = 1;
                    572:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    573:                        goto hbhcheck;
                    574:                }
                    575:        }
1.9       itojun    576:     }
1.2       itojun    577: #endif
                    578:
                    579:        /*
                    580:         * Now there is no reason to process the packet if it's not our own
                    581:         * and we're not a router.
                    582:         */
                    583:        if (!ip6_forwarding) {
                    584:                ip6stat.ip6s_cantforward++;
1.9       itojun    585:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    586:                goto bad;
                    587:        }
                    588:
                    589:   hbhcheck:
                    590:        /*
                    591:         * Process Hop-by-Hop options header if it's contained.
                    592:         * m may be modified in ip6_hopopts_input().
                    593:         * If a JumboPayload option is included, plen will also be modified.
                    594:         */
                    595:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    596:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    597:                struct ip6_hbh *hbh;
                    598:
                    599:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    600: #if 0  /*touches NULL pointer*/
                    601:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    602: #endif
1.2       itojun    603:                        return; /* m have already been freed */
1.9       itojun    604:                }
1.22      itojun    605:
1.2       itojun    606:                /* adjust pointer */
                    607:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    608:
                    609:                /*
1.49      itojun    610:                 * if the payload length field is 0 and the next header field
1.22      itojun    611:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    612:                 * option MUST be included.
                    613:                 */
                    614:                if (ip6->ip6_plen == 0 && plen == 0) {
                    615:                        /*
                    616:                         * Note that if a valid jumbo payload option is
                    617:                         * contained, ip6_hoptops_input() must set a valid
1.55      itojun    618:                         * (non-zero) payload length to the variable plen.
1.22      itojun    619:                         */
                    620:                        ip6stat.ip6s_badoptions++;
                    621:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    622:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    623:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    624:                                    ICMP6_PARAMPROB_HEADER,
                    625:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    626:                        return;
                    627:                }
1.9       itojun    628:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    629:                        sizeof(struct ip6_hbh));
                    630:                if (hbh == NULL) {
                    631:                        ip6stat.ip6s_tooshort++;
                    632:                        return;
                    633:                }
1.57      thorpej   634:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    635:                nxt = hbh->ip6h_nxt;
1.2       itojun    636:
                    637:                /*
                    638:                 * accept the packet if a router alert option is included
                    639:                 * and we act as an IPv6 router.
                    640:                 */
1.5       itojun    641:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    642:                        ours = 1;
                    643:        } else
                    644:                nxt = ip6->ip6_nxt;
                    645:
                    646:        /*
                    647:         * Check that the amount of data in the buffers
                    648:         * is as at least much as the IPv6 header would have us expect.
                    649:         * Trim mbufs if longer than we expect.
                    650:         * Drop packet if shorter than we expect.
                    651:         */
                    652:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    653:                ip6stat.ip6s_tooshort++;
1.9       itojun    654:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    655:                goto bad;
                    656:        }
                    657:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    658:                if (m->m_len == m->m_pkthdr.len) {
                    659:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    660:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    661:                } else
                    662:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    663:        }
                    664:
                    665:        /*
                    666:         * Forward if desirable.
                    667:         */
                    668:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    669:                /*
                    670:                 * If we are acting as a multicast router, all
                    671:                 * incoming multicast packets are passed to the
                    672:                 * kernel-level multicast forwarding function.
                    673:                 * The packet is returned (relatively) intact; if
                    674:                 * ip6_mforward() returns a non-zero value, the packet
                    675:                 * must be discarded, else it may be accepted below.
                    676:                 */
                    677:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    678:                        ip6stat.ip6s_cantforward++;
                    679:                        m_freem(m);
                    680:                        return;
                    681:                }
                    682:                if (!ours) {
                    683:                        m_freem(m);
                    684:                        return;
                    685:                }
1.22      itojun    686:        } else if (!ours) {
1.64      itojun    687:                ip6_forward(m, srcrt);
1.2       itojun    688:                return;
1.56      itojun    689:        }
1.25      itojun    690:
                    691:        ip6 = mtod(m, struct ip6_hdr *);
                    692:
                    693:        /*
                    694:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    695:         * tcp/udp stack and bypass security checks (act as if it was from
                    696:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    697:         *
                    698:         * For SIIT end node behavior, you may want to disable the check.
                    699:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    700:         * source.
                    701:         */
                    702:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    703:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    704:                ip6stat.ip6s_badscope++;
                    705:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    706:                goto bad;
                    707:        }
1.2       itojun    708:
                    709:        /*
                    710:         * Tell launch routine the next header
                    711:         */
1.12      itojun    712: #ifdef IFA_STATS
1.28      itojun    713:        if (deliverifp != NULL) {
1.9       itojun    714:                struct in6_ifaddr *ia6;
                    715:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    716:                if (ia6)
                    717:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    718:        }
                    719: #endif
1.2       itojun    720:        ip6stat.ip6s_delivered++;
1.9       itojun    721:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    722:        nest = 0;
1.40      itojun    723:
1.2       itojun    724:        while (nxt != IPPROTO_DONE) {
                    725:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    726:                        ip6stat.ip6s_toomanyhdr++;
                    727:                        goto bad;
                    728:                }
1.8       itojun    729:
                    730:                /*
                    731:                 * protection against faulty packet - there should be
                    732:                 * more sanity checks in header chain processing.
                    733:                 */
                    734:                if (m->m_pkthdr.len < off) {
                    735:                        ip6stat.ip6s_tooshort++;
1.9       itojun    736:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    737:                        goto bad;
                    738:                }
                    739:
1.37      itojun    740: #ifdef IPSEC
                    741:                /*
                    742:                 * enforce IPsec policy checking if we are seeing last header.
                    743:                 * note that we do not visit this with protocols with pcb layer
                    744:                 * code - like udp/tcp/raw ip.
                    745:                 */
                    746:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    747:                    ipsec6_in_reject(m, NULL)) {
                    748:                        ipsec6stat.in_polvio++;
                    749:                        goto bad;
                    750:                }
                    751: #endif
1.56      itojun    752:
1.2       itojun    753:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    754:        }
                    755:        return;
                    756:  bad:
                    757:        m_freem(m);
                    758: }
                    759:
                    760: /*
                    761:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    762:  * included, the real payload length will be stored in plenp.
                    763:  */
                    764: static int
                    765: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    766:        u_int32_t *plenp;
1.5       itojun    767:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    768:        struct mbuf **mp;
                    769:        int *offp;
                    770: {
1.35      itojun    771:        struct mbuf *m = *mp;
1.2       itojun    772:        int off = *offp, hbhlen;
                    773:        struct ip6_hbh *hbh;
                    774:        u_int8_t *opt;
                    775:
                    776:        /* validation of the length of the header */
1.9       itojun    777:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    778:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    779:        if (hbh == NULL) {
                    780:                ip6stat.ip6s_tooshort++;
                    781:                return -1;
                    782:        }
                    783:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    784:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    785:                hbhlen);
                    786:        if (hbh == NULL) {
                    787:                ip6stat.ip6s_tooshort++;
                    788:                return -1;
                    789:        }
1.57      thorpej   790:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    791:        off += hbhlen;
                    792:        hbhlen -= sizeof(struct ip6_hbh);
                    793:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    794:
                    795:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    796:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    797:                return (-1);
1.2       itojun    798:
                    799:        *offp = off;
                    800:        *mp = m;
1.58      itojun    801:        return (0);
1.2       itojun    802: }
                    803:
                    804: /*
                    805:  * Search header for all Hop-by-hop options and process each option.
                    806:  * This function is separate from ip6_hopopts_input() in order to
                    807:  * handle a case where the sending node itself process its hop-by-hop
                    808:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    809:  *
                    810:  * The function assumes that hbh header is located right after the IPv6 header
                    811:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    812:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    813:  */
                    814: int
                    815: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    816:        struct mbuf *m;
                    817:        u_int8_t *opthead;
                    818:        int hbhlen;
1.5       itojun    819:        u_int32_t *rtalertp;
1.2       itojun    820:        u_int32_t *plenp;
                    821: {
                    822:        struct ip6_hdr *ip6;
                    823:        int optlen = 0;
                    824:        u_int8_t *opt = opthead;
                    825:        u_int16_t rtalert_val;
1.22      itojun    826:        u_int32_t jumboplen;
1.55      itojun    827:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    828:
                    829:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    830:                switch (*opt) {
                    831:                case IP6OPT_PAD1:
                    832:                        optlen = 1;
                    833:                        break;
                    834:                case IP6OPT_PADN:
                    835:                        if (hbhlen < IP6OPT_MINLEN) {
                    836:                                ip6stat.ip6s_toosmall++;
                    837:                                goto bad;
                    838:                        }
                    839:                        optlen = *(opt + 1) + 2;
                    840:                        break;
                    841:                case IP6OPT_RTALERT:
                    842:                        /* XXX may need check for alignment */
                    843:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    844:                                ip6stat.ip6s_toosmall++;
                    845:                                goto bad;
                    846:                        }
                    847:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    848:                                /* XXX stat */
                    849:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    850:                                    ICMP6_PARAMPROB_HEADER,
                    851:                                    erroff + opt + 1 - opthead);
                    852:                                return (-1);
1.35      itojun    853:                        }
                    854:                        optlen = IP6OPT_RTALERT_LEN;
                    855:                        bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    856:                        *rtalertp = ntohs(rtalert_val);
                    857:                        break;
                    858:                case IP6OPT_JUMBO:
1.22      itojun    859:                        /* XXX may need check for alignment */
                    860:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    861:                                ip6stat.ip6s_toosmall++;
                    862:                                goto bad;
                    863:                        }
1.35      itojun    864:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    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:                        }
1.22      itojun    871:                        optlen = IP6OPT_JUMBO_LEN;
                    872:
                    873:                        /*
                    874:                         * IPv6 packets that have non 0 payload length
1.35      itojun    875:                         * must not contain a jumbo payload option.
1.22      itojun    876:                         */
                    877:                        ip6 = mtod(m, struct ip6_hdr *);
                    878:                        if (ip6->ip6_plen) {
                    879:                                ip6stat.ip6s_badoptions++;
                    880:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    881:                                    ICMP6_PARAMPROB_HEADER,
                    882:                                    erroff + opt - opthead);
                    883:                                return (-1);
1.22      itojun    884:                        }
1.2       itojun    885:
1.22      itojun    886:                        /*
                    887:                         * We may see jumbolen in unaligned location, so
                    888:                         * we'd need to perform bcopy().
                    889:                         */
                    890:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    891:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    892:
                    893: #if 1
                    894:                        /*
                    895:                         * if there are multiple jumbo payload options,
                    896:                         * *plenp will be non-zero and the packet will be
                    897:                         * rejected.
                    898:                         * the behavior may need some debate in ipngwg -
                    899:                         * multiple options does not make sense, however,
                    900:                         * there's no explicit mention in specification.
                    901:                         */
                    902:                        if (*plenp != 0) {
                    903:                                ip6stat.ip6s_badoptions++;
                    904:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    905:                                    ICMP6_PARAMPROB_HEADER,
                    906:                                    erroff + opt + 2 - opthead);
                    907:                                return (-1);
1.22      itojun    908:                        }
1.8       itojun    909: #endif
1.2       itojun    910:
1.22      itojun    911:                        /*
                    912:                         * jumbo payload length must be larger than 65535.
                    913:                         */
                    914:                        if (jumboplen <= IPV6_MAXPACKET) {
                    915:                                ip6stat.ip6s_badoptions++;
                    916:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    917:                                    ICMP6_PARAMPROB_HEADER,
                    918:                                    erroff + opt + 2 - opthead);
                    919:                                return (-1);
1.22      itojun    920:                        }
                    921:                        *plenp = jumboplen;
                    922:
                    923:                        break;
1.35      itojun    924:                default:                /* unknown option */
                    925:                        if (hbhlen < IP6OPT_MINLEN) {
                    926:                                ip6stat.ip6s_toosmall++;
                    927:                                goto bad;
                    928:                        }
1.55      itojun    929:                        optlen = ip6_unknown_opt(opt, m,
                    930:                            erroff + opt - opthead);
                    931:                        if (optlen == -1)
                    932:                                return (-1);
1.35      itojun    933:                        optlen += 2;
                    934:                        break;
1.2       itojun    935:                }
                    936:        }
                    937:
1.55      itojun    938:        return (0);
1.2       itojun    939:
                    940:   bad:
                    941:        m_freem(m);
1.55      itojun    942:        return (-1);
1.2       itojun    943: }
                    944:
                    945: /*
                    946:  * Unknown option processing.
                    947:  * The third argument `off' is the offset from the IPv6 header to the option,
                    948:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    949:  * is not continuous in order to return an ICMPv6 error.
                    950:  */
                    951: int
                    952: ip6_unknown_opt(optp, m, off)
                    953:        u_int8_t *optp;
                    954:        struct mbuf *m;
                    955:        int off;
                    956: {
                    957:        struct ip6_hdr *ip6;
                    958:
1.35      itojun    959:        switch (IP6OPT_TYPE(*optp)) {
                    960:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun    961:                return ((int)*(optp + 1));
1.35      itojun    962:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                    963:                m_freem(m);
1.58      itojun    964:                return (-1);
1.35      itojun    965:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    966:                ip6stat.ip6s_badoptions++;
                    967:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun    968:                return (-1);
1.35      itojun    969:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    970:                ip6stat.ip6s_badoptions++;
                    971:                ip6 = mtod(m, struct ip6_hdr *);
                    972:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    973:                    (m->m_flags & (M_BCAST|M_MCAST)))
                    974:                        m_freem(m);
                    975:                else
                    976:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    977:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun    978:                return (-1);
1.2       itojun    979:        }
                    980:
                    981:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun    982:        return (-1);
1.2       itojun    983: }
                    984:
                    985: /*
1.9       itojun    986:  * Create the "control" list for this pcb.
                    987:  *
                    988:  * The routine will be called from upper layer handlers like tcp6_input().
                    989:  * Thus the routine assumes that the caller (tcp6_input) have already
                    990:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                    991:  * very first mbuf on the mbuf chain.
                    992:  * We may want to add some infinite loop prevention or sanity checks for safety.
                    993:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                    994:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun    995:  */
                    996: void
                    997: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun    998:        struct in6pcb *in6p;
                    999:        struct mbuf **mp;
                   1000:        struct ip6_hdr *ip6;
                   1001:        struct mbuf *m;
1.2       itojun   1002: {
                   1003:        struct proc *p = curproc;       /* XXX */
1.9       itojun   1004:        int privileged;
1.2       itojun   1005:
1.9       itojun   1006:        privileged = 0;
                   1007:        if (p && !suser(p->p_ucred, &p->p_acflag))
                   1008:                privileged++;
                   1009:
                   1010: #ifdef SO_TIMESTAMP
1.2       itojun   1011:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1012:                struct timeval tv;
                   1013:
                   1014:                microtime(&tv);
                   1015:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1.63      itojun   1016:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1017:                if (*mp)
                   1018:                        mp = &(*mp)->m_next;
                   1019:        }
1.9       itojun   1020: #endif
1.2       itojun   1021:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                   1022:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1.63      itojun   1023:                    sizeof(struct in6_addr), IPV6_RECVDSTADDR, IPPROTO_IPV6);
1.2       itojun   1024:                if (*mp)
                   1025:                        mp = &(*mp)->m_next;
                   1026:        }
                   1027:
                   1028: #ifdef noyet
                   1029:        /* options were tossed above */
                   1030:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                   1031:                /* broken */
                   1032:        /* ip6_srcroute doesn't do what we want here, need to fix */
                   1033:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                   1034:                /* broken */
                   1035: #endif
                   1036:
                   1037:        /* RFC 2292 sec. 5 */
1.35      itojun   1038:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1039:                struct in6_pktinfo pi6;
                   1040:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                   1041:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                   1042:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                   1043:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                   1044:                                        ? m->m_pkthdr.rcvif->if_index
                   1045:                                        : 0;
                   1046:                *mp = sbcreatecontrol((caddr_t) &pi6,
1.63      itojun   1047:                    sizeof(struct in6_pktinfo), IPV6_PKTINFO, IPPROTO_IPV6);
1.2       itojun   1048:                if (*mp)
                   1049:                        mp = &(*mp)->m_next;
                   1050:        }
                   1051:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1052:                int hlim = ip6->ip6_hlim & 0xff;
1.63      itojun   1053:                *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
                   1054:                    IPV6_HOPLIMIT, IPPROTO_IPV6);
1.2       itojun   1055:                if (*mp)
                   1056:                        mp = &(*mp)->m_next;
                   1057:        }
                   1058:        /* IN6P_NEXTHOP - for outgoing packet only */
                   1059:
                   1060:        /*
                   1061:         * IPV6_HOPOPTS socket option. We require super-user privilege
                   1062:         * for the option, but it might be too strict, since there might
                   1063:         * be some hop-by-hop options which can be returned to normal user.
                   1064:         * See RFC 2292 section 6.
                   1065:         */
1.35      itojun   1066:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2       itojun   1067:                /*
                   1068:                 * Check if a hop-by-hop options header is contatined in the
                   1069:                 * received packet, and if so, store the options as ancillary
                   1070:                 * data. Note that a hop-by-hop options header must be
                   1071:                 * just after the IPv6 header, which fact is assured through
                   1072:                 * the IPv6 input processing.
                   1073:                 */
                   1074:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1075:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1076:                        struct ip6_hbh *hbh;
                   1077:                        int hbhlen;
1.62      itojun   1078:                        struct mbuf *ext;
1.9       itojun   1079:
1.62      itojun   1080:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
                   1081:                            ip6->ip6_nxt);
                   1082:                        if (ext == NULL) {
1.9       itojun   1083:                                ip6stat.ip6s_tooshort++;
                   1084:                                return;
                   1085:                        }
1.62      itojun   1086:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1087:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1088:                        if (hbhlen != ext->m_len) {
                   1089:                                m_freem(ext);
1.9       itojun   1090:                                ip6stat.ip6s_tooshort++;
                   1091:                                return;
                   1092:                        }
1.2       itojun   1093:
                   1094:                        /*
                   1095:                         * XXX: We copy whole the header even if a jumbo
                   1096:                         * payload option is included, which option is to
                   1097:                         * be removed before returning in the RFC 2292.
                   1098:                         * But it's too painful operation...
                   1099:                         */
1.9       itojun   1100:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.63      itojun   1101:                            IPV6_HOPOPTS, IPPROTO_IPV6);
1.2       itojun   1102:                        if (*mp)
                   1103:                                mp = &(*mp)->m_next;
1.62      itojun   1104:                        m_freem(ext);
1.2       itojun   1105:                }
                   1106:        }
                   1107:
                   1108:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1109:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1110:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.60      simonb   1111:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1112:
                   1113:                /*
                   1114:                 * Search for destination options headers or routing
                   1115:                 * header(s) through the header chain, and stores each
                   1116:                 * header as ancillary data.
                   1117:                 * Note that the order of the headers remains in
                   1118:                 * the chain of ancillary data.
                   1119:                 */
1.35      itojun   1120:                while (1) {     /* is explicit loop prevention necessary? */
1.62      itojun   1121:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1122:                        int elen;
1.62      itojun   1123:                        struct mbuf *ext = NULL;
1.9       itojun   1124:
1.62      itojun   1125:                        /*
                   1126:                         * if it is not an extension header, don't try to
                   1127:                         * pull it from the chain.
                   1128:                         */
                   1129:                        switch (nxt) {
                   1130:                        case IPPROTO_DSTOPTS:
                   1131:                        case IPPROTO_ROUTING:
                   1132:                        case IPPROTO_HOPOPTS:
                   1133:                        case IPPROTO_AH: /* is it possible? */
                   1134:                                break;
                   1135:                        default:
                   1136:                                goto loopend;
                   1137:                        }
                   1138:
                   1139:                        ext = ip6_pullexthdr(m, off, nxt);
                   1140:                        if (ext == NULL) {
1.9       itojun   1141:                                ip6stat.ip6s_tooshort++;
                   1142:                                return;
                   1143:                        }
1.62      itojun   1144:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1145:                        if (nxt == IPPROTO_AH)
                   1146:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1147:                        else
                   1148:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1149:                        if (elen != ext->m_len) {
                   1150:                                m_freem(ext);
1.9       itojun   1151:                                ip6stat.ip6s_tooshort++;
                   1152:                                return;
                   1153:                        }
1.57      thorpej  1154:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1155:
1.35      itojun   1156:                        switch (nxt) {
1.62      itojun   1157:                        case IPPROTO_DSTOPTS:
1.35      itojun   1158:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1159:                                        break;
                   1160:
                   1161:                                /*
                   1162:                                 * We also require super-user privilege for
                   1163:                                 * the option.
                   1164:                                 * See the comments on IN6_HOPOPTS.
                   1165:                                 */
                   1166:                                if (!privileged)
                   1167:                                        break;
                   1168:
                   1169:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63      itojun   1170:                                    IPV6_DSTOPTS, IPPROTO_IPV6);
1.35      itojun   1171:                                if (*mp)
                   1172:                                        mp = &(*mp)->m_next;
                   1173:                                break;
                   1174:
                   1175:                        case IPPROTO_ROUTING:
                   1176:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1177:                                        break;
                   1178:
                   1179:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63      itojun   1180:                                    IPV6_RTHDR, IPPROTO_IPV6);
1.35      itojun   1181:                                if (*mp)
                   1182:                                        mp = &(*mp)->m_next;
                   1183:                                break;
                   1184:
1.62      itojun   1185:                        case IPPROTO_HOPOPTS:
                   1186:                        case IPPROTO_AH: /* is it possible? */
                   1187:                                break;
                   1188:
1.35      itojun   1189:                        default:
                   1190:                                /*
1.62      itojun   1191:                                 * other cases have been filtered in the above.
                   1192:                                 * none will visit this case.  here we supply
                   1193:                                 * the code just in case (nxt overwritten or
                   1194:                                 * other cases).
1.35      itojun   1195:                                 */
1.62      itojun   1196:                                m_freem(ext);
1.35      itojun   1197:                                goto loopend;
                   1198:
1.2       itojun   1199:                        }
                   1200:
                   1201:                        /* proceed with the next header. */
1.9       itojun   1202:                        off += elen;
1.2       itojun   1203:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1204:                        ip6e = NULL;
                   1205:                        m_freem(ext);
                   1206:                        ext = NULL;
1.2       itojun   1207:                }
                   1208:          loopend:
1.62      itojun   1209:                ;
1.2       itojun   1210:        }
1.62      itojun   1211: }
                   1212:
                   1213: /*
                   1214:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1215:  * contains the result, or NULL on error.
                   1216:  */
                   1217: static struct mbuf *
                   1218: ip6_pullexthdr(m, off, nxt)
                   1219:        struct mbuf *m;
                   1220:        size_t off;
                   1221:        int nxt;
                   1222: {
                   1223:        struct ip6_ext ip6e;
                   1224:        size_t elen;
                   1225:        struct mbuf *n;
                   1226:
                   1227: #ifdef DIAGNOSTIC
                   1228:        switch (nxt) {
                   1229:        case IPPROTO_DSTOPTS:
                   1230:        case IPPROTO_ROUTING:
                   1231:        case IPPROTO_HOPOPTS:
                   1232:        case IPPROTO_AH: /* is it possible? */
                   1233:                break;
                   1234:        default:
                   1235:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1236:        }
1.62      itojun   1237: #endif
1.2       itojun   1238:
1.62      itojun   1239:        m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1240:        if (nxt == IPPROTO_AH)
                   1241:                elen = (ip6e.ip6e_len + 2) << 2;
                   1242:        else
                   1243:                elen = (ip6e.ip6e_len + 1) << 3;
                   1244:
                   1245:        MGET(n, M_DONTWAIT, MT_DATA);
                   1246:        if (n && elen >= MLEN) {
                   1247:                MCLGET(n, M_DONTWAIT);
                   1248:                if ((n->m_flags & M_EXT) == 0) {
                   1249:                        m_free(n);
                   1250:                        n = NULL;
                   1251:                }
                   1252:        }
                   1253:        if (!n)
                   1254:                return NULL;
                   1255:
                   1256:        n->m_len = 0;
                   1257:        if (elen >= M_TRAILINGSPACE(n)) {
                   1258:                m_free(n);
                   1259:                return NULL;
                   1260:        }
                   1261:
                   1262:        m_copydata(m, off, elen, mtod(n, caddr_t));
                   1263:        n->m_len = elen;
                   1264:        return n;
1.2       itojun   1265: }
                   1266:
                   1267: /*
                   1268:  * Get pointer to the previous header followed by the header
                   1269:  * currently processed.
                   1270:  * XXX: This function supposes that
                   1271:  *     M includes all headers,
                   1272:  *     the next header field and the header length field of each header
                   1273:  *     are valid, and
                   1274:  *     the sum of each header length equals to OFF.
                   1275:  * Because of these assumptions, this function must be called very
                   1276:  * carefully. Moreover, it will not be used in the near future when
                   1277:  * we develop `neater' mechanism to process extension headers.
                   1278:  */
1.58      itojun   1279: u_int8_t *
1.2       itojun   1280: ip6_get_prevhdr(m, off)
                   1281:        struct mbuf *m;
                   1282:        int off;
                   1283: {
                   1284:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1285:
                   1286:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1287:                return (&ip6->ip6_nxt);
1.2       itojun   1288:        else {
                   1289:                int len, nxt;
                   1290:                struct ip6_ext *ip6e = NULL;
                   1291:
                   1292:                nxt = ip6->ip6_nxt;
                   1293:                len = sizeof(struct ip6_hdr);
                   1294:                while (len < off) {
                   1295:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1296:
1.35      itojun   1297:                        switch (nxt) {
1.2       itojun   1298:                        case IPPROTO_FRAGMENT:
                   1299:                                len += sizeof(struct ip6_frag);
                   1300:                                break;
                   1301:                        case IPPROTO_AH:
                   1302:                                len += (ip6e->ip6e_len + 2) << 2;
                   1303:                                break;
                   1304:                        default:
                   1305:                                len += (ip6e->ip6e_len + 1) << 3;
                   1306:                                break;
                   1307:                        }
                   1308:                        nxt = ip6e->ip6e_nxt;
                   1309:                }
                   1310:                if (ip6e)
1.58      itojun   1311:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1312:                else
                   1313:                        return NULL;
1.18      itojun   1314:        }
                   1315: }
                   1316:
                   1317: /*
                   1318:  * get next header offset.  m will be retained.
                   1319:  */
                   1320: int
                   1321: ip6_nexthdr(m, off, proto, nxtp)
                   1322:        struct mbuf *m;
                   1323:        int off;
                   1324:        int proto;
                   1325:        int *nxtp;
                   1326: {
                   1327:        struct ip6_hdr ip6;
                   1328:        struct ip6_ext ip6e;
                   1329:        struct ip6_frag fh;
                   1330:
                   1331:        /* just in case */
                   1332:        if (m == NULL)
                   1333:                panic("ip6_nexthdr: m == NULL");
                   1334:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1335:                return -1;
                   1336:
                   1337:        switch (proto) {
                   1338:        case IPPROTO_IPV6:
                   1339:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1340:                        return -1;
                   1341:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1342:                if (nxtp)
                   1343:                        *nxtp = ip6.ip6_nxt;
                   1344:                off += sizeof(ip6);
                   1345:                return off;
                   1346:
                   1347:        case IPPROTO_FRAGMENT:
                   1348:                /*
                   1349:                 * terminate parsing if it is not the first fragment,
                   1350:                 * it does not make sense to parse through it.
                   1351:                 */
                   1352:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1353:                        return -1;
                   1354:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
                   1355:                if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
                   1356:                        return -1;
                   1357:                if (nxtp)
                   1358:                        *nxtp = fh.ip6f_nxt;
                   1359:                off += sizeof(struct ip6_frag);
                   1360:                return off;
                   1361:
                   1362:        case IPPROTO_AH:
                   1363:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1364:                        return -1;
                   1365:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1366:                if (nxtp)
                   1367:                        *nxtp = ip6e.ip6e_nxt;
                   1368:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1369:                if (m->m_pkthdr.len < off)
                   1370:                        return -1;
1.18      itojun   1371:                return off;
                   1372:
                   1373:        case IPPROTO_HOPOPTS:
                   1374:        case IPPROTO_ROUTING:
                   1375:        case IPPROTO_DSTOPTS:
                   1376:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1377:                        return -1;
                   1378:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1379:                if (nxtp)
                   1380:                        *nxtp = ip6e.ip6e_nxt;
                   1381:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1382:                if (m->m_pkthdr.len < off)
                   1383:                        return -1;
1.18      itojun   1384:                return off;
                   1385:
                   1386:        case IPPROTO_NONE:
                   1387:        case IPPROTO_ESP:
                   1388:        case IPPROTO_IPCOMP:
                   1389:                /* give up */
                   1390:                return -1;
                   1391:
                   1392:        default:
                   1393:                return -1;
                   1394:        }
                   1395: }
                   1396:
                   1397: /*
                   1398:  * get offset for the last header in the chain.  m will be kept untainted.
                   1399:  */
                   1400: int
                   1401: ip6_lasthdr(m, off, proto, nxtp)
                   1402:        struct mbuf *m;
                   1403:        int off;
                   1404:        int proto;
                   1405:        int *nxtp;
                   1406: {
                   1407:        int newoff;
                   1408:        int nxt;
                   1409:
                   1410:        if (!nxtp) {
                   1411:                nxt = -1;
                   1412:                nxtp = &nxt;
                   1413:        }
                   1414:        while (1) {
                   1415:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1416:                if (newoff < 0)
                   1417:                        return off;
                   1418:                else if (newoff < off)
                   1419:                        return -1;      /* invalid */
                   1420:                else if (newoff == off)
                   1421:                        return newoff;
                   1422:
                   1423:                off = newoff;
                   1424:                proto = *nxtp;
1.2       itojun   1425:        }
                   1426: }
                   1427:
                   1428: /*
                   1429:  * System control for IP6
                   1430:  */
                   1431:
                   1432: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1433:        0,              0,              0,              0,
                   1434:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1435:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1436:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1437:        0,              0,              0,              0,
                   1438:        ENOPROTOOPT
                   1439: };
                   1440:
                   1441: int
                   1442: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1443:        int *name;
                   1444:        u_int namelen;
                   1445:        void *oldp;
                   1446:        size_t *oldlenp;
                   1447:        void *newp;
                   1448:        size_t newlen;
                   1449: {
1.26      itojun   1450:        int old, error;
                   1451:
1.2       itojun   1452:        /* All sysctl names at this level are terminal. */
                   1453:        if (namelen != 1)
                   1454:                return ENOTDIR;
                   1455:
                   1456:        switch (name[0]) {
                   1457:
                   1458:        case IPV6CTL_FORWARDING:
                   1459:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1460:                                  &ip6_forwarding);
                   1461:        case IPV6CTL_SENDREDIRECTS:
                   1462:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1463:                                &ip6_sendredirects);
                   1464:        case IPV6CTL_DEFHLIM:
                   1465:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                   1466:        case IPV6CTL_MAXFRAGPACKETS:
                   1467:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1468:                                &ip6_maxfragpackets);
                   1469:        case IPV6CTL_ACCEPT_RTADV:
                   1470:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1471:                                &ip6_accept_rtadv);
                   1472:        case IPV6CTL_KEEPFAITH:
                   1473:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                   1474:        case IPV6CTL_LOG_INTERVAL:
                   1475:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1476:                                &ip6_log_interval);
                   1477:        case IPV6CTL_HDRNESTLIMIT:
                   1478:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1479:                                &ip6_hdrnestlimit);
                   1480:        case IPV6CTL_DAD_COUNT:
                   1481:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1482:        case IPV6CTL_AUTO_FLOWLABEL:
                   1483:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1484:                                &ip6_auto_flowlabel);
                   1485:        case IPV6CTL_DEFMCASTHLIM:
                   1486:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1487:                                &ip6_defmcasthlim);
1.51      itojun   1488: #if NGIF > 0
1.2       itojun   1489:        case IPV6CTL_GIF_HLIM:
                   1490:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1491:                                &ip6_gif_hlim);
1.51      itojun   1492: #endif
1.2       itojun   1493:        case IPV6CTL_KAME_VERSION:
                   1494:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9       itojun   1495:        case IPV6CTL_USE_DEPRECATED:
                   1496:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1497:                                &ip6_use_deprecated);
1.10      itojun   1498:        case IPV6CTL_RR_PRUNE:
                   1499:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.43      itojun   1500:        case IPV6CTL_V6ONLY:
                   1501: #ifdef INET6_BINDV6ONLY
                   1502:                return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
                   1503: #else
                   1504:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26      itojun   1505: #endif
                   1506:        case IPV6CTL_ANONPORTMIN:
                   1507:                old = ip6_anonportmin;
                   1508:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1509:                    &ip6_anonportmin);
                   1510:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
                   1511:                    ip6_anonportmin > 65535
                   1512: #ifndef IPNOPRIVPORTS
                   1513:                    || ip6_anonportmin < IPV6PORT_RESERVED
                   1514: #endif
                   1515:                    ) {
                   1516:                        ip6_anonportmin = old;
                   1517:                        return (EINVAL);
                   1518:                }
                   1519:                return (error);
                   1520:        case IPV6CTL_ANONPORTMAX:
                   1521:                old = ip6_anonportmax;
                   1522:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1523:                    &ip6_anonportmax);
                   1524:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
                   1525:                    ip6_anonportmax > 65535
                   1526: #ifndef IPNOPRIVPORTS
                   1527:                    || ip6_anonportmax < IPV6PORT_RESERVED
                   1528: #endif
                   1529:                    ) {
                   1530:                        ip6_anonportmax = old;
                   1531:                        return (EINVAL);
                   1532:                }
                   1533:                return (error);
                   1534: #ifndef IPNOPRIVPORTS
                   1535:        case IPV6CTL_LOWPORTMIN:
                   1536:                old = ip6_lowportmin;
                   1537:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1538:                    &ip6_lowportmin);
                   1539:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1540:                    ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
                   1541:                    ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
                   1542:                        ip6_lowportmin = old;
                   1543:                        return (EINVAL);
                   1544:                }
                   1545:                return (error);
                   1546:        case IPV6CTL_LOWPORTMAX:
                   1547:                old = ip6_lowportmax;
                   1548:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1549:                    &ip6_lowportmax);
                   1550:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1551:                    ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
                   1552:                    ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
                   1553:                        ip6_lowportmax = old;
                   1554:                        return (EINVAL);
                   1555:                }
                   1556:                return (error);
1.11      itojun   1557: #endif
1.53      itojun   1558:        case IPV6CTL_MAXFRAGS:
                   1559:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
1.2       itojun   1560:        default:
                   1561:                return EOPNOTSUPP;
                   1562:        }
                   1563:        /* NOTREACHED */
                   1564: }

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