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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.37.2.1

1.37.2.1! nathanw     1: /*     $NetBSD: ip6_input.c,v 1.37 2001/03/01 16:31:41 itojun Exp $    */
1.37      itojun      2: /*     $KAME: ip6_input.c,v 1.183 2001/03/01 15:15:23 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
                     45:  * 3. All advertising materials mentioning features or use of this software
                     46:  *    must display the following acknowledgement:
                     47:  *     This product includes software developed by the University of
                     48:  *     California, Berkeley and its contributors.
                     49:  * 4. Neither the name of the University nor the names of its contributors
                     50:  *    may be used to endorse or promote products derived from this software
                     51:  *    without specific prior written permission.
                     52:  *
                     53:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     54:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     55:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     56:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     57:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     58:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     59:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     60:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     61:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     62:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     63:  * SUCH DAMAGE.
                     64:  *
                     65:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     66:  */
                     67:
                     68: #include "opt_inet.h"
1.4       thorpej    69: #include "opt_ipsec.h"
1.15      darrenr    70: #include "opt_pfil_hooks.h"
1.2       itojun     71:
                     72: #include <sys/param.h>
                     73: #include <sys/systm.h>
                     74: #include <sys/malloc.h>
                     75: #include <sys/mbuf.h>
                     76: #include <sys/domain.h>
                     77: #include <sys/protosw.h>
                     78: #include <sys/socket.h>
                     79: #include <sys/socketvar.h>
                     80: #include <sys/errno.h>
                     81: #include <sys/time.h>
                     82: #include <sys/kernel.h>
                     83: #include <sys/syslog.h>
1.37.2.1! nathanw    84: #include <sys/lwp.h>
1.2       itojun     85: #include <sys/proc.h>
                     86:
                     87: #include <net/if.h>
                     88: #include <net/if_types.h>
                     89: #include <net/if_dl.h>
                     90: #include <net/route.h>
                     91: #include <net/netisr.h>
1.15      darrenr    92: #ifdef PFIL_HOOKS
                     93: #include <net/pfil.h>
                     94: #endif
1.2       itojun     95:
                     96: #include <netinet/in.h>
1.9       itojun     97: #include <netinet/in_systm.h>
                     98: #ifdef INET
                     99: #include <netinet/ip.h>
                    100: #include <netinet/ip_icmp.h>
                    101: #endif /*INET*/
1.14      itojun    102: #include <netinet/ip6.h>
1.2       itojun    103: #include <netinet6/in6_var.h>
1.11      itojun    104: #include <netinet6/ip6_var.h>
1.2       itojun    105: #include <netinet6/in6_pcb.h>
1.14      itojun    106: #include <netinet/icmp6.h>
1.2       itojun    107: #include <netinet6/in6_ifattach.h>
                    108: #include <netinet6/nd6.h>
1.9       itojun    109: #include <netinet6/in6_prefix.h>
1.2       itojun    110:
1.37      itojun    111: #ifdef IPSEC
                    112: #include <netinet6/ipsec.h>
                    113: #endif
                    114:
1.2       itojun    115: #include <netinet6/ip6protosw.h>
                    116:
                    117: /* we need it for NLOOP. */
                    118: #include "loop.h"
                    119: #include "faith.h"
                    120:
                    121: #include "gif.h"
                    122: #include "bpfilter.h"
                    123:
1.9       itojun    124: #include <net/net_osdep.h>
                    125:
1.2       itojun    126: extern struct domain inet6domain;
                    127:
                    128: u_char ip6_protox[IPPROTO_MAX];
                    129: static int ip6qmaxlen = IFQ_MAXLEN;
                    130: struct in6_ifaddr *in6_ifaddr;
                    131: struct ifqueue ip6intrq;
                    132:
                    133: extern struct ifnet loif[NLOOP];
                    134: int ip6_forward_srcrt;                 /* XXX */
                    135: int ip6_sourcecheck;                   /* XXX */
                    136: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    137:
1.29      thorpej   138: #ifdef PFIL_HOOKS
                    139: struct pfil_head inet6_pfil_hook;
                    140: #endif
                    141:
1.2       itojun    142: struct ip6stat ip6stat;
                    143:
                    144: static void ip6_init2 __P((void *));
                    145:
1.5       itojun    146: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2       itojun    147:
                    148: /*
                    149:  * IP6 initialization: fill in IP6 protocol switch table.
                    150:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    151:  */
                    152: void
                    153: ip6_init()
                    154: {
1.35      itojun    155:        struct ip6protosw *pr;
                    156:        int i;
1.2       itojun    157:        struct timeval tv;
                    158:
                    159:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    160:        if (pr == 0)
                    161:                panic("ip6_init");
                    162:        for (i = 0; i < IPPROTO_MAX; i++)
                    163:                ip6_protox[i] = pr - inet6sw;
                    164:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    165:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    166:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    167:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    168:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    169:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    170:        nd6_init();
                    171:        frag6_init();
                    172:        /*
                    173:         * in many cases, random() here does NOT return random number
                    174:         * as initialization during bootstrap time occur in fixed order.
                    175:         */
                    176:        microtime(&tv);
                    177:        ip6_flow_seq = random() ^ tv.tv_usec;
                    178:
                    179:        ip6_init2((void *)0);
1.29      thorpej   180:
                    181: #ifdef PFIL_HOOKS
                    182:        /* Register our Packet Filter hook. */
1.33      thorpej   183:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    184:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   185:        i = pfil_head_register(&inet6_pfil_hook);
                    186:        if (i != 0)
                    187:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    188:                    "error %d\n", i);
                    189: #endif /* PFIL_HOOKS */
1.2       itojun    190: }
                    191:
                    192: static void
                    193: ip6_init2(dummy)
                    194:        void *dummy;
                    195: {
                    196:        /*
                    197:         * to route local address of p2p link to loopback,
1.21      itojun    198:         * assign loopback address first.
1.2       itojun    199:         */
1.20      itojun    200:        in6_ifattach(&loif[0], NULL);
1.2       itojun    201:
                    202:        /* nd6_timer_init */
1.19      thorpej   203:        callout_init(&nd6_timer_ch);
                    204:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9       itojun    205:        /* router renumbering prefix list maintenance */
1.19      thorpej   206:        callout_init(&in6_rr_timer_ch);
                    207:        callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2       itojun    208: }
                    209:
                    210: /*
                    211:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    212:  */
                    213: void
                    214: ip6intr()
                    215: {
                    216:        int s;
                    217:        struct mbuf *m;
                    218:
                    219:        for (;;) {
                    220:                s = splimp();
                    221:                IF_DEQUEUE(&ip6intrq, m);
                    222:                splx(s);
                    223:                if (m == 0)
                    224:                        return;
                    225:                ip6_input(m);
                    226:        }
                    227: }
                    228:
                    229: extern struct  route_in6 ip6_forward_rt;
                    230:
                    231: void
                    232: ip6_input(m)
                    233:        struct mbuf *m;
                    234: {
1.9       itojun    235:        struct ip6_hdr *ip6;
1.2       itojun    236:        int off = sizeof(struct ip6_hdr), nest;
                    237:        u_int32_t plen;
1.5       itojun    238:        u_int32_t rtalert = ~0;
1.2       itojun    239:        int nxt, ours = 0;
1.9       itojun    240:        struct ifnet *deliverifp = NULL;
1.2       itojun    241:
                    242: #ifdef IPSEC
                    243:        /*
                    244:         * should the inner packet be considered authentic?
                    245:         * see comment in ah4_input().
                    246:         */
                    247:        if (m) {
                    248:                m->m_flags &= ~M_AUTHIPHDR;
                    249:                m->m_flags &= ~M_AUTHIPDGM;
                    250:        }
                    251: #endif
1.9       itojun    252:
1.2       itojun    253:        /*
                    254:         * mbuf statistics by kazu
                    255:         */
                    256:        if (m->m_flags & M_EXT) {
                    257:                if (m->m_next)
                    258:                        ip6stat.ip6s_mext2m++;
                    259:                else
                    260:                        ip6stat.ip6s_mext1++;
                    261:        } else {
                    262:                if (m->m_next) {
1.9       itojun    263:                        if (m->m_flags & M_LOOP) {
1.2       itojun    264:                                ip6stat.ip6s_m2m[loif[0].if_index]++;   /*XXX*/
1.22      itojun    265:                        } else if (m->m_pkthdr.rcvif->if_index <= 31)
1.2       itojun    266:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    267:                        else
                    268:                                ip6stat.ip6s_m2m[0]++;
                    269:                } else
                    270:                        ip6stat.ip6s_m1++;
                    271:        }
                    272:
1.9       itojun    273:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    274:        ip6stat.ip6s_total++;
                    275:
                    276: #ifndef PULLDOWN_TEST
                    277:        /* XXX is the line really necessary? */
1.2       itojun    278:        IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9       itojun    279: #endif
1.2       itojun    280:
1.9       itojun    281:        if (m->m_len < sizeof(struct ip6_hdr)) {
                    282:                struct ifnet *inifp;
                    283:                inifp = m->m_pkthdr.rcvif;
                    284:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
                    285:                        ip6stat.ip6s_toosmall++;
                    286:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    287:                        return;
                    288:                }
1.2       itojun    289:        }
                    290:
                    291:        ip6 = mtod(m, struct ip6_hdr *);
                    292:
                    293:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    294:                ip6stat.ip6s_badvers++;
1.9       itojun    295:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    296:                goto bad;
                    297:        }
1.15      darrenr   298:
                    299: #ifdef PFIL_HOOKS
                    300:        /*
                    301:         * Run through list of hooks for input packets.  If there are any
                    302:         * filters which require that additional packets in the flow are
                    303:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    304:         * Note that filters must _never_ set this flag, as another filter
                    305:         * in the list may have previously cleared it.
                    306:         */
1.29      thorpej   307:        if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    308:                           PFIL_IN) != 0)
                    309:                return;
                    310:        if (m == NULL)
                    311:                return;
                    312:        ip6 = mtod(m, struct ip6_hdr *);
1.15      darrenr   313: #endif /* PFIL_HOOKS */
                    314:
1.2       itojun    315:
                    316:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    317:
1.30      thorpej   318: #ifdef ALTQ
                    319:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    320:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    321:                /* packet is dropped by traffic conditioner */
                    322:                return;
1.9       itojun    323:        }
                    324: #endif
                    325:
1.2       itojun    326:        /*
                    327:         * Scope check
                    328:         */
                    329:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    330:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
                    331:                ip6stat.ip6s_badscope++;
1.9       itojun    332:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    333:                goto bad;
                    334:        }
1.13      itojun    335:        /*
                    336:         * The following check is not documented in the spec.  Malicious party
                    337:         * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
                    338:         * bypass security checks (act as if it was from 127.0.0.1 by using
                    339:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    340:         *
                    341:         * This check chokes if we are in SIIT cloud.  As none of BSDs support
                    342:         * IPv4-less kernel compilation, we cannot support SIIT environment
                    343:         * at all.  So, it makes more sense for us to reject any malicious
                    344:         * packets for non-SIIT environment, than try to do a partical support
                    345:         * for SIIT environment.
1.13      itojun    346:         */
                    347:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    348:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    349:                ip6stat.ip6s_badscope++;
                    350:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    351:                goto bad;
                    352:        }
1.17      itojun    353: #if 0
1.13      itojun    354:        /*
1.17      itojun    355:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    356:         *
                    357:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    358:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    359:         * is revised to forbid relaying case.
1.13      itojun    360:         */
                    361:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    362:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    363:                ip6stat.ip6s_badscope++;
                    364:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    365:                goto bad;
                    366:        }
                    367: #endif
1.35      itojun    368:
1.2       itojun    369:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    370:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    371:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    372:                        ours = 1;
1.9       itojun    373:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    374:                        goto hbhcheck;
                    375:                } else {
                    376:                        ip6stat.ip6s_badscope++;
1.9       itojun    377:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    378:                        goto bad;
                    379:                }
                    380:        }
                    381:
1.21      itojun    382: #ifndef FAKE_LOOPBACK_IF
                    383:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
                    384: #else
                    385:        if (1)
                    386: #endif
                    387:        {
1.2       itojun    388:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    389:                        ip6->ip6_src.s6_addr16[1]
                    390:                                = htons(m->m_pkthdr.rcvif->if_index);
                    391:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    392:                        ip6->ip6_dst.s6_addr16[1]
                    393:                                = htons(m->m_pkthdr.rcvif->if_index);
                    394:        }
                    395:
1.9       itojun    396:        /*
1.21      itojun    397:         * XXX we need this since we do not have "goto ours" hack route
                    398:         * for some of our ifaddrs on loopback interface.
                    399:         * we should correct it by changing in6_ifattach to install
                    400:         * "goto ours" hack route.
1.9       itojun    401:         */
1.21      itojun    402:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
                    403:                if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    404:                        ours = 1;
                    405:                        deliverifp = m->m_pkthdr.rcvif;
                    406:                        goto hbhcheck;
                    407:                }
1.9       itojun    408:        }
                    409:
1.2       itojun    410:        /*
                    411:         * Multicast check
                    412:         */
                    413:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    414:                struct  in6_multi *in6m = 0;
1.9       itojun    415:
                    416:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    417:                /*
                    418:                 * See if we belong to the destination multicast group on the
                    419:                 * arrival interface.
                    420:                 */
                    421:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    422:                if (in6m)
                    423:                        ours = 1;
                    424:                else if (!ip6_mrouter) {
                    425:                        ip6stat.ip6s_notmember++;
                    426:                        ip6stat.ip6s_cantforward++;
1.9       itojun    427:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    428:                        goto bad;
                    429:                }
1.9       itojun    430:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    431:                goto hbhcheck;
                    432:        }
                    433:
                    434:        /*
                    435:         *  Unicast check
                    436:         */
1.22      itojun    437:        if (ip6_forward_rt.ro_rt != NULL &&
                    438:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
                    439:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35      itojun    440:                               &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25      itojun    441:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    442:        else {
1.35      itojun    443:                struct sockaddr_in6 *dst6;
                    444:
1.2       itojun    445:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    446:                        /* route is down or destination is different */
1.25      itojun    447:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    448:                        RTFREE(ip6_forward_rt.ro_rt);
                    449:                        ip6_forward_rt.ro_rt = 0;
                    450:                }
1.22      itojun    451:
1.2       itojun    452:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35      itojun    453:                dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
                    454:                dst6->sin6_len = sizeof(struct sockaddr_in6);
                    455:                dst6->sin6_family = AF_INET6;
                    456:                dst6->sin6_addr = ip6->ip6_dst;
1.2       itojun    457:
1.9       itojun    458:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    459:        }
                    460:
                    461: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    462:
                    463:        /*
                    464:         * Accept the packet if the forwarding interface to the destination
                    465:         * according to the routing table is the loopback interface,
                    466:         * unless the associated route has a gateway.
                    467:         * Note that this approach causes to accept a packet if there is a
                    468:         * route to the loopback interface for the destination of the packet.
                    469:         * But we think it's even useful in some situations, e.g. when using
                    470:         * a special daemon which wants to intercept the packet.
                    471:         */
                    472:        if (ip6_forward_rt.ro_rt &&
                    473:            (ip6_forward_rt.ro_rt->rt_flags &
                    474:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    475: #if 0
                    476:            /*
                    477:             * The check below is redundant since the comparison of
                    478:             * the destination and the key of the rtentry has
                    479:             * already done through looking up the routing table.
                    480:             */
                    481:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                    482:                               &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
                    483: #endif
1.9       itojun    484:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    485:                struct in6_ifaddr *ia6 =
                    486:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    487:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    488:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    489:                /*
                    490:                 * packets to a tentative, duplicated, or somehow invalid
                    491:                 * address must not be accepted.
                    492:                 */
1.2       itojun    493:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    494:                        /* this address is ready */
1.2       itojun    495:                        ours = 1;
1.9       itojun    496:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    497:                        goto hbhcheck;
                    498:                } else {
1.24      itojun    499:                        /* address is not ready, so discard the packet. */
1.34      itojun    500:                        nd6log((LOG_INFO,
1.27      itojun    501:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    502:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    503:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    504:
                    505:                        goto bad;
1.2       itojun    506:                }
                    507:        }
                    508:
                    509:        /*
                    510:         * FAITH(Firewall Aided Internet Translator)
                    511:         */
                    512: #if defined(NFAITH) && 0 < NFAITH
                    513:        if (ip6_keepfaith) {
                    514:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    515:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    516:                        /* XXX do we need more sanity checks? */
                    517:                        ours = 1;
1.9       itojun    518:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
                    519:                        goto hbhcheck;
                    520:                }
                    521:        }
                    522: #endif
                    523:
                    524: #if 0
                    525:     {
                    526:        /*
                    527:         * Last resort: check in6_ifaddr for incoming interface.
                    528:         * The code is here until I update the "goto ours hack" code above
                    529:         * working right.
                    530:         */
                    531:        struct ifaddr *ifa;
                    532:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    533:             ifa;
                    534:             ifa = ifa->ifa_list.tqe_next) {
                    535:                if (ifa->ifa_addr == NULL)
                    536:                        continue;       /* just for safety */
                    537:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    538:                        continue;
                    539:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    540:                        ours = 1;
                    541:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    542:                        goto hbhcheck;
                    543:                }
                    544:        }
1.9       itojun    545:     }
1.2       itojun    546: #endif
                    547:
                    548:        /*
                    549:         * Now there is no reason to process the packet if it's not our own
                    550:         * and we're not a router.
                    551:         */
                    552:        if (!ip6_forwarding) {
                    553:                ip6stat.ip6s_cantforward++;
1.9       itojun    554:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    555:                goto bad;
                    556:        }
                    557:
                    558:   hbhcheck:
                    559:        /*
                    560:         * Process Hop-by-Hop options header if it's contained.
                    561:         * m may be modified in ip6_hopopts_input().
                    562:         * If a JumboPayload option is included, plen will also be modified.
                    563:         */
                    564:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    565:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    566:                struct ip6_hbh *hbh;
                    567:
                    568:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    569: #if 0  /*touches NULL pointer*/
                    570:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    571: #endif
1.2       itojun    572:                        return; /* m have already been freed */
1.9       itojun    573:                }
1.22      itojun    574:
1.2       itojun    575:                /* adjust pointer */
                    576:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    577:
                    578:                /*
                    579:                 * if the payload length field is 0 and the next header field
                    580:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    581:                 * option MUST be included.
                    582:                 */
                    583:                if (ip6->ip6_plen == 0 && plen == 0) {
                    584:                        /*
                    585:                         * Note that if a valid jumbo payload option is
                    586:                         * contained, ip6_hoptops_input() must set a valid
                    587:                         * (non-zero) payload length to the variable plen.
                    588:                         */
                    589:                        ip6stat.ip6s_badoptions++;
                    590:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    591:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    592:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    593:                                    ICMP6_PARAMPROB_HEADER,
                    594:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    595:                        return;
                    596:                }
1.9       itojun    597: #ifndef PULLDOWN_TEST
                    598:                /* ip6_hopopts_input() ensures that mbuf is contiguous */
                    599:                hbh = (struct ip6_hbh *)(ip6 + 1);
                    600: #else
                    601:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    602:                        sizeof(struct ip6_hbh));
                    603:                if (hbh == NULL) {
                    604:                        ip6stat.ip6s_tooshort++;
                    605:                        return;
                    606:                }
                    607: #endif
                    608:                nxt = hbh->ip6h_nxt;
1.2       itojun    609:
                    610:                /*
                    611:                 * accept the packet if a router alert option is included
                    612:                 * and we act as an IPv6 router.
                    613:                 */
1.5       itojun    614:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    615:                        ours = 1;
                    616:        } else
                    617:                nxt = ip6->ip6_nxt;
                    618:
                    619:        /*
                    620:         * Check that the amount of data in the buffers
                    621:         * is as at least much as the IPv6 header would have us expect.
                    622:         * Trim mbufs if longer than we expect.
                    623:         * Drop packet if shorter than we expect.
                    624:         */
                    625:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    626:                ip6stat.ip6s_tooshort++;
1.9       itojun    627:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    628:                goto bad;
                    629:        }
                    630:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    631:                if (m->m_len == m->m_pkthdr.len) {
                    632:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    633:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    634:                } else
                    635:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    636:        }
                    637:
                    638:        /*
                    639:         * Forward if desirable.
                    640:         */
                    641:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    642:                /*
                    643:                 * If we are acting as a multicast router, all
                    644:                 * incoming multicast packets are passed to the
                    645:                 * kernel-level multicast forwarding function.
                    646:                 * The packet is returned (relatively) intact; if
                    647:                 * ip6_mforward() returns a non-zero value, the packet
                    648:                 * must be discarded, else it may be accepted below.
                    649:                 */
                    650:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    651:                        ip6stat.ip6s_cantforward++;
                    652:                        m_freem(m);
                    653:                        return;
                    654:                }
                    655:                if (!ours) {
                    656:                        m_freem(m);
                    657:                        return;
                    658:                }
1.22      itojun    659:        } else if (!ours) {
1.2       itojun    660:                ip6_forward(m, 0);
                    661:                return;
                    662:        }
1.25      itojun    663:
                    664:        ip6 = mtod(m, struct ip6_hdr *);
                    665:
                    666:        /*
                    667:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    668:         * tcp/udp stack and bypass security checks (act as if it was from
                    669:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    670:         *
                    671:         * For SIIT end node behavior, you may want to disable the check.
                    672:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    673:         * source.
                    674:         */
                    675:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    676:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    677:                ip6stat.ip6s_badscope++;
                    678:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    679:                goto bad;
                    680:        }
1.2       itojun    681:
                    682:        /*
                    683:         * Tell launch routine the next header
                    684:         */
1.12      itojun    685: #ifdef IFA_STATS
1.28      itojun    686:        if (deliverifp != NULL) {
1.9       itojun    687:                struct in6_ifaddr *ia6;
                    688:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    689:                if (ia6)
                    690:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    691:        }
                    692: #endif
1.2       itojun    693:        ip6stat.ip6s_delivered++;
1.9       itojun    694:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    695:        nest = 0;
                    696:        while (nxt != IPPROTO_DONE) {
                    697:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    698:                        ip6stat.ip6s_toomanyhdr++;
                    699:                        goto bad;
                    700:                }
1.8       itojun    701:
                    702:                /*
                    703:                 * protection against faulty packet - there should be
                    704:                 * more sanity checks in header chain processing.
                    705:                 */
                    706:                if (m->m_pkthdr.len < off) {
                    707:                        ip6stat.ip6s_tooshort++;
1.9       itojun    708:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    709:                        goto bad;
                    710:                }
                    711:
1.37      itojun    712: #ifdef IPSEC
                    713:                /*
                    714:                 * enforce IPsec policy checking if we are seeing last header.
                    715:                 * note that we do not visit this with protocols with pcb layer
                    716:                 * code - like udp/tcp/raw ip.
                    717:                 */
                    718:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    719:                    ipsec6_in_reject(m, NULL)) {
                    720:                        ipsec6stat.in_polvio++;
                    721:                        goto bad;
                    722:                }
                    723: #endif
                    724:
1.2       itojun    725:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    726:        }
                    727:        return;
                    728:  bad:
                    729:        m_freem(m);
                    730: }
                    731:
                    732: /*
                    733:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    734:  * included, the real payload length will be stored in plenp.
                    735:  */
                    736: static int
                    737: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    738:        u_int32_t *plenp;
1.5       itojun    739:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    740:        struct mbuf **mp;
                    741:        int *offp;
                    742: {
1.35      itojun    743:        struct mbuf *m = *mp;
1.2       itojun    744:        int off = *offp, hbhlen;
                    745:        struct ip6_hbh *hbh;
                    746:        u_int8_t *opt;
                    747:
                    748:        /* validation of the length of the header */
1.9       itojun    749: #ifndef PULLDOWN_TEST
1.2       itojun    750:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
                    751:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    752:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    753:
                    754:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
                    755:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9       itojun    756: #else
                    757:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    758:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    759:        if (hbh == NULL) {
                    760:                ip6stat.ip6s_tooshort++;
                    761:                return -1;
                    762:        }
                    763:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    764:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    765:                hbhlen);
                    766:        if (hbh == NULL) {
                    767:                ip6stat.ip6s_tooshort++;
                    768:                return -1;
                    769:        }
                    770: #endif
1.2       itojun    771:        off += hbhlen;
                    772:        hbhlen -= sizeof(struct ip6_hbh);
                    773:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    774:
                    775:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    776:                                hbhlen, rtalertp, plenp) < 0)
                    777:                return(-1);
                    778:
                    779:        *offp = off;
                    780:        *mp = m;
                    781:        return(0);
                    782: }
                    783:
                    784: /*
                    785:  * Search header for all Hop-by-hop options and process each option.
                    786:  * This function is separate from ip6_hopopts_input() in order to
                    787:  * handle a case where the sending node itself process its hop-by-hop
                    788:  * options header. In such a case, the function is called from ip6_output().
                    789:  */
                    790: int
                    791: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    792:        struct mbuf *m;
                    793:        u_int8_t *opthead;
                    794:        int hbhlen;
1.5       itojun    795:        u_int32_t *rtalertp;
1.2       itojun    796:        u_int32_t *plenp;
                    797: {
                    798:        struct ip6_hdr *ip6;
                    799:        int optlen = 0;
                    800:        u_int8_t *opt = opthead;
                    801:        u_int16_t rtalert_val;
1.22      itojun    802:        u_int32_t jumboplen;
1.2       itojun    803:
                    804:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    805:                switch (*opt) {
                    806:                case IP6OPT_PAD1:
                    807:                        optlen = 1;
                    808:                        break;
                    809:                case IP6OPT_PADN:
                    810:                        if (hbhlen < IP6OPT_MINLEN) {
                    811:                                ip6stat.ip6s_toosmall++;
                    812:                                goto bad;
                    813:                        }
                    814:                        optlen = *(opt + 1) + 2;
                    815:                        break;
                    816:                case IP6OPT_RTALERT:
                    817:                        /* XXX may need check for alignment */
                    818:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    819:                                ip6stat.ip6s_toosmall++;
                    820:                                goto bad;
                    821:                        }
                    822:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
                    823:                                 /* XXX: should we discard the packet? */
                    824:                                log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
                    825:                                    *(opt + 1));
                    826:                        }
                    827:                        optlen = IP6OPT_RTALERT_LEN;
                    828:                        bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    829:                        *rtalertp = ntohs(rtalert_val);
                    830:                        break;
                    831:                case IP6OPT_JUMBO:
1.22      itojun    832:                        /* XXX may need check for alignment */
                    833:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    834:                                ip6stat.ip6s_toosmall++;
                    835:                                goto bad;
                    836:                        }
1.35      itojun    837:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
                    838:                                /* XXX: should we discard the packet? */
1.22      itojun    839:                                log(LOG_ERR, "length of jumbopayload opt "
1.27      itojun    840:                                    "is inconsistent(%d)\n",
1.22      itojun    841:                                    *(opt + 1));
1.35      itojun    842:                        }
1.22      itojun    843:                        optlen = IP6OPT_JUMBO_LEN;
                    844:
                    845:                        /*
                    846:                         * IPv6 packets that have non 0 payload length
1.35      itojun    847:                         * must not contain a jumbo payload option.
1.22      itojun    848:                         */
                    849:                        ip6 = mtod(m, struct ip6_hdr *);
                    850:                        if (ip6->ip6_plen) {
                    851:                                ip6stat.ip6s_badoptions++;
                    852:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    853:                                            ICMP6_PARAMPROB_HEADER,
                    854:                                            sizeof(struct ip6_hdr) +
                    855:                                            sizeof(struct ip6_hbh) +
                    856:                                            opt - opthead);
                    857:                                return(-1);
                    858:                        }
1.2       itojun    859:
1.22      itojun    860:                        /*
                    861:                         * We may see jumbolen in unaligned location, so
                    862:                         * we'd need to perform bcopy().
                    863:                         */
                    864:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    865:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    866:
                    867: #if 1
                    868:                        /*
                    869:                         * if there are multiple jumbo payload options,
                    870:                         * *plenp will be non-zero and the packet will be
                    871:                         * rejected.
                    872:                         * the behavior may need some debate in ipngwg -
                    873:                         * multiple options does not make sense, however,
                    874:                         * there's no explicit mention in specification.
                    875:                         */
                    876:                        if (*plenp != 0) {
                    877:                                ip6stat.ip6s_badoptions++;
                    878:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    879:                                            ICMP6_PARAMPROB_HEADER,
                    880:                                            sizeof(struct ip6_hdr) +
                    881:                                            sizeof(struct ip6_hbh) +
                    882:                                            opt + 2 - opthead);
                    883:                                return(-1);
                    884:                        }
1.8       itojun    885: #endif
1.2       itojun    886:
1.22      itojun    887:                        /*
                    888:                         * jumbo payload length must be larger than 65535.
                    889:                         */
                    890:                        if (jumboplen <= IPV6_MAXPACKET) {
                    891:                                ip6stat.ip6s_badoptions++;
                    892:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    893:                                            ICMP6_PARAMPROB_HEADER,
                    894:                                            sizeof(struct ip6_hdr) +
                    895:                                            sizeof(struct ip6_hbh) +
                    896:                                            opt + 2 - opthead);
                    897:                                return(-1);
                    898:                        }
                    899:                        *plenp = jumboplen;
                    900:
                    901:                        break;
1.35      itojun    902:                default:                /* unknown option */
                    903:                        if (hbhlen < IP6OPT_MINLEN) {
                    904:                                ip6stat.ip6s_toosmall++;
                    905:                                goto bad;
                    906:                        }
                    907:                        if ((optlen = ip6_unknown_opt(opt, m,
                    908:                                                      sizeof(struct ip6_hdr) +
                    909:                                                      sizeof(struct ip6_hbh) +
                    910:                                                      opt - opthead)) == -1)
                    911:                                return(-1);
                    912:                        optlen += 2;
                    913:                        break;
1.2       itojun    914:                }
                    915:        }
                    916:
                    917:        return(0);
                    918:
                    919:   bad:
                    920:        m_freem(m);
                    921:        return(-1);
                    922: }
                    923:
                    924: /*
                    925:  * Unknown option processing.
                    926:  * The third argument `off' is the offset from the IPv6 header to the option,
                    927:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    928:  * is not continuous in order to return an ICMPv6 error.
                    929:  */
                    930: int
                    931: ip6_unknown_opt(optp, m, off)
                    932:        u_int8_t *optp;
                    933:        struct mbuf *m;
                    934:        int off;
                    935: {
                    936:        struct ip6_hdr *ip6;
                    937:
1.35      itojun    938:        switch (IP6OPT_TYPE(*optp)) {
                    939:        case IP6OPT_TYPE_SKIP: /* ignore the option */
                    940:                return((int)*(optp + 1));
                    941:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                    942:                m_freem(m);
                    943:                return(-1);
                    944:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    945:                ip6stat.ip6s_badoptions++;
                    946:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
                    947:                return(-1);
                    948:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    949:                ip6stat.ip6s_badoptions++;
                    950:                ip6 = mtod(m, struct ip6_hdr *);
                    951:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    952:                    (m->m_flags & (M_BCAST|M_MCAST)))
                    953:                        m_freem(m);
                    954:                else
                    955:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    956:                                    ICMP6_PARAMPROB_OPTION, off);
                    957:                return(-1);
1.2       itojun    958:        }
                    959:
                    960:        m_freem(m);             /* XXX: NOTREACHED */
                    961:        return(-1);
                    962: }
                    963:
                    964: /*
1.9       itojun    965:  * Create the "control" list for this pcb.
                    966:  *
                    967:  * The routine will be called from upper layer handlers like tcp6_input().
                    968:  * Thus the routine assumes that the caller (tcp6_input) have already
                    969:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                    970:  * very first mbuf on the mbuf chain.
                    971:  * We may want to add some infinite loop prevention or sanity checks for safety.
                    972:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                    973:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun    974:  */
                    975: void
                    976: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun    977:        struct in6pcb *in6p;
                    978:        struct mbuf **mp;
                    979:        struct ip6_hdr *ip6;
                    980:        struct mbuf *m;
1.2       itojun    981: {
1.37.2.1! nathanw   982:        struct proc *p = curproc->l_proc;       /* XXX */
1.9       itojun    983:        int privileged;
1.2       itojun    984:
1.9       itojun    985:        privileged = 0;
                    986:        if (p && !suser(p->p_ucred, &p->p_acflag))
                    987:                privileged++;
                    988:
                    989: #ifdef SO_TIMESTAMP
1.2       itojun    990:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                    991:                struct timeval tv;
                    992:
                    993:                microtime(&tv);
                    994:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                    995:                        SCM_TIMESTAMP, SOL_SOCKET);
                    996:                if (*mp)
                    997:                        mp = &(*mp)->m_next;
                    998:        }
1.9       itojun    999: #endif
1.2       itojun   1000:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                   1001:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
                   1002:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
                   1003:                        IPPROTO_IPV6);
                   1004:                if (*mp)
                   1005:                        mp = &(*mp)->m_next;
                   1006:        }
                   1007:
                   1008: #ifdef noyet
                   1009:        /* options were tossed above */
                   1010:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                   1011:                /* broken */
                   1012:        /* ip6_srcroute doesn't do what we want here, need to fix */
                   1013:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                   1014:                /* broken */
                   1015: #endif
                   1016:
                   1017:        /* RFC 2292 sec. 5 */
1.35      itojun   1018:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1019:                struct in6_pktinfo pi6;
                   1020:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                   1021:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                   1022:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                   1023:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                   1024:                                        ? m->m_pkthdr.rcvif->if_index
                   1025:                                        : 0;
                   1026:                *mp = sbcreatecontrol((caddr_t) &pi6,
                   1027:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
                   1028:                        IPPROTO_IPV6);
                   1029:                if (*mp)
                   1030:                        mp = &(*mp)->m_next;
                   1031:        }
                   1032:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1033:                int hlim = ip6->ip6_hlim & 0xff;
                   1034:                *mp = sbcreatecontrol((caddr_t) &hlim,
                   1035:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
                   1036:                if (*mp)
                   1037:                        mp = &(*mp)->m_next;
                   1038:        }
                   1039:        /* IN6P_NEXTHOP - for outgoing packet only */
                   1040:
                   1041:        /*
                   1042:         * IPV6_HOPOPTS socket option. We require super-user privilege
                   1043:         * for the option, but it might be too strict, since there might
                   1044:         * be some hop-by-hop options which can be returned to normal user.
                   1045:         * See RFC 2292 section 6.
                   1046:         */
1.35      itojun   1047:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2       itojun   1048:                /*
                   1049:                 * Check if a hop-by-hop options header is contatined in the
                   1050:                 * received packet, and if so, store the options as ancillary
                   1051:                 * data. Note that a hop-by-hop options header must be
                   1052:                 * just after the IPv6 header, which fact is assured through
                   1053:                 * the IPv6 input processing.
                   1054:                 */
                   1055:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1056:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1057:                        struct ip6_hbh *hbh;
                   1058:                        int hbhlen;
                   1059:
                   1060: #ifndef PULLDOWN_TEST
                   1061:                        hbh = (struct ip6_hbh *)(ip6 + 1);
                   1062:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1063: #else
                   1064:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1065:                                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                   1066:                        if (hbh == NULL) {
                   1067:                                ip6stat.ip6s_tooshort++;
                   1068:                                return;
                   1069:                        }
                   1070:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1071:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1072:                                sizeof(struct ip6_hdr), hbhlen);
                   1073:                        if (hbh == NULL) {
                   1074:                                ip6stat.ip6s_tooshort++;
                   1075:                                return;
                   1076:                        }
                   1077: #endif
1.2       itojun   1078:
                   1079:                        /*
                   1080:                         * XXX: We copy whole the header even if a jumbo
                   1081:                         * payload option is included, which option is to
                   1082:                         * be removed before returning in the RFC 2292.
                   1083:                         * But it's too painful operation...
                   1084:                         */
1.9       itojun   1085:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2       itojun   1086:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
                   1087:                        if (*mp)
                   1088:                                mp = &(*mp)->m_next;
                   1089:                }
                   1090:        }
                   1091:
                   1092:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1093:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1094:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1095:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
                   1096:
                   1097:                /*
                   1098:                 * Search for destination options headers or routing
                   1099:                 * header(s) through the header chain, and stores each
                   1100:                 * header as ancillary data.
                   1101:                 * Note that the order of the headers remains in
                   1102:                 * the chain of ancillary data.
                   1103:                 */
1.35      itojun   1104:                while (1) {     /* is explicit loop prevention necessary? */
1.9       itojun   1105:                        struct ip6_ext *ip6e;
                   1106:                        int elen;
                   1107:
                   1108: #ifndef PULLDOWN_TEST
                   1109:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
                   1110:                        if (nxt == IPPROTO_AH)
                   1111:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1112:                        else
                   1113:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1114: #else
                   1115:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
                   1116:                                sizeof(struct ip6_ext));
                   1117:                        if (ip6e == NULL) {
                   1118:                                ip6stat.ip6s_tooshort++;
                   1119:                                return;
                   1120:                        }
                   1121:                        if (nxt == IPPROTO_AH)
                   1122:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1123:                        else
                   1124:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1125:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
                   1126:                        if (ip6e == NULL) {
                   1127:                                ip6stat.ip6s_tooshort++;
                   1128:                                return;
                   1129:                        }
                   1130: #endif
1.2       itojun   1131:
1.35      itojun   1132:                        switch (nxt) {
                   1133:                        case IPPROTO_DSTOPTS:
                   1134:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1135:                                        break;
                   1136:
                   1137:                                /*
                   1138:                                 * We also require super-user privilege for
                   1139:                                 * the option.
                   1140:                                 * See the comments on IN6_HOPOPTS.
                   1141:                                 */
                   1142:                                if (!privileged)
                   1143:                                        break;
                   1144:
                   1145:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1146:                                                      IPV6_DSTOPTS,
                   1147:                                                      IPPROTO_IPV6);
                   1148:                                if (*mp)
                   1149:                                        mp = &(*mp)->m_next;
                   1150:                                break;
                   1151:
                   1152:                        case IPPROTO_ROUTING:
                   1153:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1154:                                        break;
                   1155:
                   1156:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1157:                                                      IPV6_RTHDR,
                   1158:                                                      IPPROTO_IPV6);
                   1159:                                if (*mp)
                   1160:                                        mp = &(*mp)->m_next;
                   1161:                                break;
                   1162:
                   1163:                        case IPPROTO_UDP:
                   1164:                        case IPPROTO_TCP:
                   1165:                        case IPPROTO_ICMPV6:
                   1166:                        default:
                   1167:                                /*
                   1168:                                 * stop search if we encounter an upper
                   1169:                                 * layer protocol headers.
                   1170:                                 */
                   1171:                                goto loopend;
                   1172:
                   1173:                        case IPPROTO_HOPOPTS:
                   1174:                        case IPPROTO_AH: /* is it possible? */
                   1175:                                break;
1.2       itojun   1176:                        }
                   1177:
                   1178:                        /* proceed with the next header. */
1.9       itojun   1179:                        off += elen;
1.2       itojun   1180:                        nxt = ip6e->ip6e_nxt;
                   1181:                }
                   1182:          loopend:
1.36      cgd      1183:                ;
1.2       itojun   1184:        }
1.9       itojun   1185:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun   1186:                /* to be done */
                   1187:        }
1.9       itojun   1188:        if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2       itojun   1189:                /* to be done */
                   1190:        }
                   1191:        /* IN6P_RTHDR - to be done */
                   1192:
                   1193: }
                   1194:
                   1195: /*
                   1196:  * Get pointer to the previous header followed by the header
                   1197:  * currently processed.
                   1198:  * XXX: This function supposes that
                   1199:  *     M includes all headers,
                   1200:  *     the next header field and the header length field of each header
                   1201:  *     are valid, and
                   1202:  *     the sum of each header length equals to OFF.
                   1203:  * Because of these assumptions, this function must be called very
                   1204:  * carefully. Moreover, it will not be used in the near future when
                   1205:  * we develop `neater' mechanism to process extension headers.
                   1206:  */
                   1207: char *
                   1208: ip6_get_prevhdr(m, off)
                   1209:        struct mbuf *m;
                   1210:        int off;
                   1211: {
                   1212:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1213:
                   1214:        if (off == sizeof(struct ip6_hdr))
                   1215:                return(&ip6->ip6_nxt);
                   1216:        else {
                   1217:                int len, nxt;
                   1218:                struct ip6_ext *ip6e = NULL;
                   1219:
                   1220:                nxt = ip6->ip6_nxt;
                   1221:                len = sizeof(struct ip6_hdr);
                   1222:                while (len < off) {
                   1223:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1224:
1.35      itojun   1225:                        switch (nxt) {
1.2       itojun   1226:                        case IPPROTO_FRAGMENT:
                   1227:                                len += sizeof(struct ip6_frag);
                   1228:                                break;
                   1229:                        case IPPROTO_AH:
                   1230:                                len += (ip6e->ip6e_len + 2) << 2;
                   1231:                                break;
                   1232:                        default:
                   1233:                                len += (ip6e->ip6e_len + 1) << 3;
                   1234:                                break;
                   1235:                        }
                   1236:                        nxt = ip6e->ip6e_nxt;
                   1237:                }
                   1238:                if (ip6e)
                   1239:                        return(&ip6e->ip6e_nxt);
                   1240:                else
                   1241:                        return NULL;
1.18      itojun   1242:        }
                   1243: }
                   1244:
                   1245: /*
                   1246:  * get next header offset.  m will be retained.
                   1247:  */
                   1248: int
                   1249: ip6_nexthdr(m, off, proto, nxtp)
                   1250:        struct mbuf *m;
                   1251:        int off;
                   1252:        int proto;
                   1253:        int *nxtp;
                   1254: {
                   1255:        struct ip6_hdr ip6;
                   1256:        struct ip6_ext ip6e;
                   1257:        struct ip6_frag fh;
                   1258:
                   1259:        /* just in case */
                   1260:        if (m == NULL)
                   1261:                panic("ip6_nexthdr: m == NULL");
                   1262:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1263:                return -1;
                   1264:
                   1265:        switch (proto) {
                   1266:        case IPPROTO_IPV6:
                   1267:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1268:                        return -1;
                   1269:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1270:                if (nxtp)
                   1271:                        *nxtp = ip6.ip6_nxt;
                   1272:                off += sizeof(ip6);
                   1273:                return off;
                   1274:
                   1275:        case IPPROTO_FRAGMENT:
                   1276:                /*
                   1277:                 * terminate parsing if it is not the first fragment,
                   1278:                 * it does not make sense to parse through it.
                   1279:                 */
                   1280:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1281:                        return -1;
                   1282:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
                   1283:                if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
                   1284:                        return -1;
                   1285:                if (nxtp)
                   1286:                        *nxtp = fh.ip6f_nxt;
                   1287:                off += sizeof(struct ip6_frag);
                   1288:                return off;
                   1289:
                   1290:        case IPPROTO_AH:
                   1291:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1292:                        return -1;
                   1293:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1294:                if (nxtp)
                   1295:                        *nxtp = ip6e.ip6e_nxt;
                   1296:                off += (ip6e.ip6e_len + 2) << 2;
                   1297:                return off;
                   1298:
                   1299:        case IPPROTO_HOPOPTS:
                   1300:        case IPPROTO_ROUTING:
                   1301:        case IPPROTO_DSTOPTS:
                   1302:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1303:                        return -1;
                   1304:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1305:                if (nxtp)
                   1306:                        *nxtp = ip6e.ip6e_nxt;
                   1307:                off += (ip6e.ip6e_len + 1) << 3;
                   1308:                return off;
                   1309:
                   1310:        case IPPROTO_NONE:
                   1311:        case IPPROTO_ESP:
                   1312:        case IPPROTO_IPCOMP:
                   1313:                /* give up */
                   1314:                return -1;
                   1315:
                   1316:        default:
                   1317:                return -1;
                   1318:        }
                   1319:
                   1320:        return -1;
                   1321: }
                   1322:
                   1323: /*
                   1324:  * get offset for the last header in the chain.  m will be kept untainted.
                   1325:  */
                   1326: int
                   1327: ip6_lasthdr(m, off, proto, nxtp)
                   1328:        struct mbuf *m;
                   1329:        int off;
                   1330:        int proto;
                   1331:        int *nxtp;
                   1332: {
                   1333:        int newoff;
                   1334:        int nxt;
                   1335:
                   1336:        if (!nxtp) {
                   1337:                nxt = -1;
                   1338:                nxtp = &nxt;
                   1339:        }
                   1340:        while (1) {
                   1341:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1342:                if (newoff < 0)
                   1343:                        return off;
                   1344:                else if (newoff < off)
                   1345:                        return -1;      /* invalid */
                   1346:                else if (newoff == off)
                   1347:                        return newoff;
                   1348:
                   1349:                off = newoff;
                   1350:                proto = *nxtp;
1.2       itojun   1351:        }
                   1352: }
                   1353:
                   1354: /*
                   1355:  * System control for IP6
                   1356:  */
                   1357:
                   1358: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1359:        0,              0,              0,              0,
                   1360:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1361:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1362:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1363:        0,              0,              0,              0,
                   1364:        ENOPROTOOPT
                   1365: };
                   1366:
1.23      mrg      1367: #include <uvm/uvm_extern.h>
1.2       itojun   1368: #include <sys/sysctl.h>
                   1369:
                   1370: int
                   1371: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1372:        int *name;
                   1373:        u_int namelen;
                   1374:        void *oldp;
                   1375:        size_t *oldlenp;
                   1376:        void *newp;
                   1377:        size_t newlen;
                   1378: {
1.26      itojun   1379:        int old, error;
                   1380:
1.2       itojun   1381:        /* All sysctl names at this level are terminal. */
                   1382:        if (namelen != 1)
                   1383:                return ENOTDIR;
                   1384:
                   1385:        switch (name[0]) {
                   1386:
                   1387:        case IPV6CTL_FORWARDING:
                   1388:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1389:                                  &ip6_forwarding);
                   1390:        case IPV6CTL_SENDREDIRECTS:
                   1391:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1392:                                &ip6_sendredirects);
                   1393:        case IPV6CTL_DEFHLIM:
                   1394:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                   1395:        case IPV6CTL_MAXFRAGPACKETS:
                   1396:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1397:                                &ip6_maxfragpackets);
                   1398:        case IPV6CTL_ACCEPT_RTADV:
                   1399:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1400:                                &ip6_accept_rtadv);
                   1401:        case IPV6CTL_KEEPFAITH:
                   1402:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                   1403:        case IPV6CTL_LOG_INTERVAL:
                   1404:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1405:                                &ip6_log_interval);
                   1406:        case IPV6CTL_HDRNESTLIMIT:
                   1407:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1408:                                &ip6_hdrnestlimit);
                   1409:        case IPV6CTL_DAD_COUNT:
                   1410:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1411:        case IPV6CTL_AUTO_FLOWLABEL:
                   1412:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1413:                                &ip6_auto_flowlabel);
                   1414:        case IPV6CTL_DEFMCASTHLIM:
                   1415:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1416:                                &ip6_defmcasthlim);
                   1417:        case IPV6CTL_GIF_HLIM:
                   1418:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1419:                                &ip6_gif_hlim);
                   1420:        case IPV6CTL_KAME_VERSION:
                   1421:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9       itojun   1422:        case IPV6CTL_USE_DEPRECATED:
                   1423:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1424:                                &ip6_use_deprecated);
1.10      itojun   1425:        case IPV6CTL_RR_PRUNE:
                   1426:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12      itojun   1427: #ifndef INET6_BINDV6ONLY
1.11      itojun   1428:        case IPV6CTL_BINDV6ONLY:
                   1429:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1430:                                &ip6_bindv6only);
1.26      itojun   1431: #endif
                   1432:        case IPV6CTL_ANONPORTMIN:
                   1433:                old = ip6_anonportmin;
                   1434:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1435:                    &ip6_anonportmin);
                   1436:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
                   1437:                    ip6_anonportmin > 65535
                   1438: #ifndef IPNOPRIVPORTS
                   1439:                    || ip6_anonportmin < IPV6PORT_RESERVED
                   1440: #endif
                   1441:                    ) {
                   1442:                        ip6_anonportmin = old;
                   1443:                        return (EINVAL);
                   1444:                }
                   1445:                return (error);
                   1446:        case IPV6CTL_ANONPORTMAX:
                   1447:                old = ip6_anonportmax;
                   1448:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1449:                    &ip6_anonportmax);
                   1450:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
                   1451:                    ip6_anonportmax > 65535
                   1452: #ifndef IPNOPRIVPORTS
                   1453:                    || ip6_anonportmax < IPV6PORT_RESERVED
                   1454: #endif
                   1455:                    ) {
                   1456:                        ip6_anonportmax = old;
                   1457:                        return (EINVAL);
                   1458:                }
                   1459:                return (error);
                   1460: #ifndef IPNOPRIVPORTS
                   1461:        case IPV6CTL_LOWPORTMIN:
                   1462:                old = ip6_lowportmin;
                   1463:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1464:                    &ip6_lowportmin);
                   1465:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1466:                    ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
                   1467:                    ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
                   1468:                        ip6_lowportmin = old;
                   1469:                        return (EINVAL);
                   1470:                }
                   1471:                return (error);
                   1472:        case IPV6CTL_LOWPORTMAX:
                   1473:                old = ip6_lowportmax;
                   1474:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1475:                    &ip6_lowportmax);
                   1476:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1477:                    ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
                   1478:                    ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
                   1479:                        ip6_lowportmax = old;
                   1480:                        return (EINVAL);
                   1481:                }
                   1482:                return (error);
1.11      itojun   1483: #endif
1.2       itojun   1484:        default:
                   1485:                return EOPNOTSUPP;
                   1486:        }
                   1487:        /* NOTREACHED */
                   1488: }

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