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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.21

1.21    ! itojun      1: /*     $NetBSD: ip6_input.c,v 1.20 2000/04/12 10:36:45 itojun Exp $    */
        !             2: /*     $KAME: ip6_input.c,v 1.89 2000/05/19 19:59:05 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>
                     84: #include <sys/proc.h>
                     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>
                    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>
1.9       itojun    108: #include <netinet6/in6_prefix.h>
1.2       itojun    109:
1.9       itojun    110: #ifdef IPV6FIREWALL
                    111: #include <netinet6/ip6_fw.h>
                    112: #endif
1.2       itojun    113:
                    114: #include <netinet6/ip6protosw.h>
                    115:
                    116: /* we need it for NLOOP. */
                    117: #include "loop.h"
                    118: #include "faith.h"
                    119:
                    120: #include "gif.h"
                    121: #include "bpfilter.h"
                    122:
1.9       itojun    123: #include <net/net_osdep.h>
                    124:
1.2       itojun    125: extern struct domain inet6domain;
                    126:
                    127: u_char ip6_protox[IPPROTO_MAX];
                    128: static int ip6qmaxlen = IFQ_MAXLEN;
                    129: struct in6_ifaddr *in6_ifaddr;
                    130: struct ifqueue ip6intrq;
                    131:
                    132: extern struct ifnet loif[NLOOP];
                    133: int ip6_forward_srcrt;                 /* XXX */
                    134: int ip6_sourcecheck;                   /* XXX */
                    135: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    136:
                    137: #ifdef IPV6FIREWALL
                    138: /* firewall hooks */
                    139: ip6_fw_chk_t *ip6_fw_chk_ptr;
                    140: ip6_fw_ctl_t *ip6_fw_ctl_ptr;
1.2       itojun    141: #endif
                    142:
                    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 *));
1.2       itojun    148:
                    149: /*
                    150:  * IP6 initialization: fill in IP6 protocol switch table.
                    151:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    152:  */
                    153: void
                    154: ip6_init()
                    155: {
                    156:        register struct ip6protosw *pr;
                    157:        register int i;
                    158:        struct timeval tv;
                    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();
1.9       itojun    173: #ifdef IPV6FIREWALL
                    174:        ip6_fw_init();
                    175: #endif
1.2       itojun    176:        /*
                    177:         * in many cases, random() here does NOT return random number
                    178:         * as initialization during bootstrap time occur in fixed order.
                    179:         */
                    180:        microtime(&tv);
                    181:        ip6_flow_seq = random() ^ tv.tv_usec;
                    182:
                    183:        ip6_init2((void *)0);
                    184: }
                    185:
                    186: static void
                    187: ip6_init2(dummy)
                    188:        void *dummy;
                    189: {
                    190:        /*
                    191:         * to route local address of p2p link to loopback,
1.21    ! itojun    192:         * assign loopback address first.
1.2       itojun    193:         */
1.20      itojun    194:        in6_ifattach(&loif[0], NULL);
1.2       itojun    195:
                    196:        /* nd6_timer_init */
1.19      thorpej   197:        callout_init(&nd6_timer_ch);
                    198:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9       itojun    199:        /* router renumbering prefix list maintenance */
1.19      thorpej   200:        callout_init(&in6_rr_timer_ch);
                    201:        callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2       itojun    202: }
                    203:
                    204: /*
                    205:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    206:  */
                    207: void
                    208: ip6intr()
                    209: {
                    210:        int s;
                    211:        struct mbuf *m;
                    212:
                    213:        for (;;) {
                    214:                s = splimp();
                    215:                IF_DEQUEUE(&ip6intrq, m);
                    216:                splx(s);
                    217:                if (m == 0)
                    218:                        return;
                    219:                ip6_input(m);
                    220:        }
                    221: }
                    222:
                    223: extern struct  route_in6 ip6_forward_rt;
                    224:
                    225: void
                    226: ip6_input(m)
                    227:        struct mbuf *m;
                    228: {
1.9       itojun    229:        struct ip6_hdr *ip6;
1.2       itojun    230:        int off = sizeof(struct ip6_hdr), nest;
                    231:        u_int32_t plen;
1.5       itojun    232:        u_int32_t rtalert = ~0;
1.2       itojun    233:        int nxt, ours = 0;
1.9       itojun    234:        struct ifnet *deliverifp = NULL;
1.15      darrenr   235: #ifdef PFIL_HOOKS
                    236:        struct packet_filter_hook *pfh;
                    237:        struct mbuf *m0;
                    238:        int rv;
                    239: #endif /* PFIL_HOOKS */
1.2       itojun    240:
                    241: #ifdef IPSEC
                    242:        /*
                    243:         * should the inner packet be considered authentic?
                    244:         * see comment in ah4_input().
                    245:         */
                    246:        if (m) {
                    247:                m->m_flags &= ~M_AUTHIPHDR;
                    248:                m->m_flags &= ~M_AUTHIPDGM;
                    249:        }
                    250: #endif
1.9       itojun    251:
1.2       itojun    252:        /*
                    253:         * mbuf statistics by kazu
                    254:         */
                    255:        if (m->m_flags & M_EXT) {
                    256:                if (m->m_next)
                    257:                        ip6stat.ip6s_mext2m++;
                    258:                else
                    259:                        ip6stat.ip6s_mext1++;
                    260:        } else {
                    261:                if (m->m_next) {
1.9       itojun    262:                        if (m->m_flags & M_LOOP) {
1.2       itojun    263:                                ip6stat.ip6s_m2m[loif[0].if_index]++;   /*XXX*/
1.9       itojun    264:                        }
1.2       itojun    265:                        else if (m->m_pkthdr.rcvif->if_index <= 31)
                    266:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    267:                        else
                    268:                                ip6stat.ip6s_m2m[0]++;
                    269:                } else
                    270:                        ip6stat.ip6s_m1++;
                    271:        }
                    272:
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:         */
                    307:        m0 = m;
1.16      darrenr   308:        pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
1.15      darrenr   309:        for (; pfh; pfh = pfh->pfil_link.tqe_next)
                    310:                if (pfh->pfil_func) {
                    311:                        rv = pfh->pfil_func(ip6, sizeof(*ip6),
                    312:                                            m->m_pkthdr.rcvif, 0, &m0);
                    313:                        if (rv)
                    314:                                return;
                    315:                        m = m0;
                    316:                        if (m == NULL)
                    317:                                return;
                    318:                        ip6 = mtod(m, struct ip6_hdr *);
                    319:                }
                    320: #endif /* PFIL_HOOKS */
                    321:
1.2       itojun    322:
                    323:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    324:
1.9       itojun    325: #ifdef IPV6FIREWALL
                    326:        /*
                    327:         * Check with the firewall...
                    328:         */
                    329:        if (ip6_fw_chk_ptr) {
                    330:                u_short port = 0;
                    331:                /* If ipfw says divert, we have to just drop packet */
                    332:                /* use port as a dummy argument */
                    333:                if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
                    334:                        m_freem(m);
                    335:                        m = NULL;
                    336:                }
                    337:                if (!m)
                    338:                        return;
                    339:        }
                    340: #endif
                    341:
1.2       itojun    342:        /*
                    343:         * Scope check
                    344:         */
                    345:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    346:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
                    347:                ip6stat.ip6s_badscope++;
1.9       itojun    348:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    349:                goto bad;
                    350:        }
1.13      itojun    351:        /*
                    352:         * The following check is not documented in the spec.  Malicious party
                    353:         * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
                    354:         * bypass security checks (act as if it was from 127.0.0.1 by using
                    355:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    356:         */
                    357:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    358:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    359:                ip6stat.ip6s_badscope++;
                    360:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    361:                goto bad;
                    362:        }
1.17      itojun    363: #if 0
1.13      itojun    364:        /*
1.17      itojun    365:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    366:         *
                    367:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    368:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    369:         * is revised to forbid relaying case.
1.13      itojun    370:         */
                    371:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    372:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    373:                ip6stat.ip6s_badscope++;
                    374:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    375:                goto bad;
                    376:        }
                    377: #endif
1.2       itojun    378:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    379:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    380:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    381:                        ours = 1;
1.9       itojun    382:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    383:                        goto hbhcheck;
                    384:                } else {
                    385:                        ip6stat.ip6s_badscope++;
1.9       itojun    386:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    387:                        goto bad;
                    388:                }
                    389:        }
                    390:
1.21    ! itojun    391: #ifndef FAKE_LOOPBACK_IF
        !           392:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
        !           393: #else
        !           394:        if (1)
        !           395: #endif
        !           396:        {
1.2       itojun    397:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    398:                        ip6->ip6_src.s6_addr16[1]
                    399:                                = htons(m->m_pkthdr.rcvif->if_index);
                    400:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    401:                        ip6->ip6_dst.s6_addr16[1]
                    402:                                = htons(m->m_pkthdr.rcvif->if_index);
                    403:        }
                    404:
1.9       itojun    405:        /*
1.21    ! itojun    406:         * XXX we need this since we do not have "goto ours" hack route
        !           407:         * for some of our ifaddrs on loopback interface.
        !           408:         * we should correct it by changing in6_ifattach to install
        !           409:         * "goto ours" hack route.
1.9       itojun    410:         */
1.21    ! itojun    411:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
        !           412:                if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
        !           413:                        ours = 1;
        !           414:                        deliverifp = m->m_pkthdr.rcvif;
        !           415:                        goto hbhcheck;
        !           416:                }
1.9       itojun    417:        }
                    418:
1.2       itojun    419:        /*
                    420:         * Multicast check
                    421:         */
                    422:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    423:                struct  in6_multi *in6m = 0;
1.9       itojun    424:
                    425:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    426:                /*
                    427:                 * See if we belong to the destination multicast group on the
                    428:                 * arrival interface.
                    429:                 */
                    430:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    431:                if (in6m)
                    432:                        ours = 1;
                    433:                else if (!ip6_mrouter) {
                    434:                        ip6stat.ip6s_notmember++;
                    435:                        ip6stat.ip6s_cantforward++;
1.9       itojun    436:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    437:                        goto bad;
                    438:                }
1.9       itojun    439:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    440:                goto hbhcheck;
                    441:        }
                    442:
                    443:        /*
                    444:         *  Unicast check
                    445:         */
                    446:        if (ip6_forward_rt.ro_rt == 0 ||
                    447:            !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                    448:                                &ip6_forward_rt.ro_dst.sin6_addr)) {
                    449:                if (ip6_forward_rt.ro_rt) {
                    450:                        RTFREE(ip6_forward_rt.ro_rt);
                    451:                        ip6_forward_rt.ro_rt = 0;
                    452:                }
                    453:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
                    454:                ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
                    455:                ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
                    456:                ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
                    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:                /* packet to tentative address must not be received */
                    488:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    489:                        m->m_flags |= M_ANYCAST6;
                    490:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
                    491:                        /* this interface is ready */
                    492:                        ours = 1;
1.9       itojun    493:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    494:                        goto hbhcheck;
                    495:                } else {
                    496:                        /* this interface is not ready, fall through */
                    497:                }
                    498:        }
                    499:
                    500:        /*
                    501:         * FAITH(Firewall Aided Internet Translator)
                    502:         */
                    503: #if defined(NFAITH) && 0 < NFAITH
                    504:        if (ip6_keepfaith) {
                    505:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    506:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    507:                        /* XXX do we need more sanity checks? */
                    508:                        ours = 1;
1.9       itojun    509:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
                    510:                        goto hbhcheck;
                    511:                }
                    512:        }
                    513: #endif
                    514:
                    515: #if 0
                    516:     {
                    517:        /*
                    518:         * Last resort: check in6_ifaddr for incoming interface.
                    519:         * The code is here until I update the "goto ours hack" code above
                    520:         * working right.
                    521:         */
                    522:        struct ifaddr *ifa;
                    523:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    524:             ifa;
                    525:             ifa = ifa->ifa_list.tqe_next) {
                    526:                if (ifa->ifa_addr == NULL)
                    527:                        continue;       /* just for safety */
                    528:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    529:                        continue;
                    530:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    531:                        ours = 1;
                    532:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    533:                        goto hbhcheck;
                    534:                }
                    535:        }
1.9       itojun    536:     }
1.2       itojun    537: #endif
                    538:
                    539:        /*
                    540:         * Now there is no reason to process the packet if it's not our own
                    541:         * and we're not a router.
                    542:         */
                    543:        if (!ip6_forwarding) {
                    544:                ip6stat.ip6s_cantforward++;
1.9       itojun    545:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    546:                goto bad;
                    547:        }
                    548:
                    549:   hbhcheck:
                    550:        /*
                    551:         * Process Hop-by-Hop options header if it's contained.
                    552:         * m may be modified in ip6_hopopts_input().
                    553:         * If a JumboPayload option is included, plen will also be modified.
                    554:         */
                    555:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    556:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    557:                struct ip6_hbh *hbh;
                    558:
                    559:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    560: #if 0  /*touches NULL pointer*/
                    561:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    562: #endif
1.2       itojun    563:                        return; /* m have already been freed */
1.9       itojun    564:                }
1.2       itojun    565:                /* adjust pointer */
                    566:                ip6 = mtod(m, struct ip6_hdr *);
1.9       itojun    567: #ifndef PULLDOWN_TEST
                    568:                /* ip6_hopopts_input() ensures that mbuf is contiguous */
                    569:                hbh = (struct ip6_hbh *)(ip6 + 1);
                    570: #else
                    571:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    572:                        sizeof(struct ip6_hbh));
                    573:                if (hbh == NULL) {
                    574:                        ip6stat.ip6s_tooshort++;
                    575:                        return;
                    576:                }
                    577: #endif
                    578:                nxt = hbh->ip6h_nxt;
1.2       itojun    579:
                    580:                /*
                    581:                 * accept the packet if a router alert option is included
                    582:                 * and we act as an IPv6 router.
                    583:                 */
1.5       itojun    584:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    585:                        ours = 1;
                    586:        } else
                    587:                nxt = ip6->ip6_nxt;
                    588:
                    589:        /*
                    590:         * Check that the amount of data in the buffers
                    591:         * is as at least much as the IPv6 header would have us expect.
                    592:         * Trim mbufs if longer than we expect.
                    593:         * Drop packet if shorter than we expect.
                    594:         */
                    595:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    596:                ip6stat.ip6s_tooshort++;
1.9       itojun    597:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    598:                goto bad;
                    599:        }
                    600:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    601:                if (m->m_len == m->m_pkthdr.len) {
                    602:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    603:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    604:                } else
                    605:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    606:        }
                    607:
                    608:        /*
                    609:         * Forward if desirable.
                    610:         */
                    611:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    612:                /*
                    613:                 * If we are acting as a multicast router, all
                    614:                 * incoming multicast packets are passed to the
                    615:                 * kernel-level multicast forwarding function.
                    616:                 * The packet is returned (relatively) intact; if
                    617:                 * ip6_mforward() returns a non-zero value, the packet
                    618:                 * must be discarded, else it may be accepted below.
                    619:                 */
                    620:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    621:                        ip6stat.ip6s_cantforward++;
                    622:                        m_freem(m);
                    623:                        return;
                    624:                }
                    625:                if (!ours) {
                    626:                        m_freem(m);
                    627:                        return;
                    628:                }
                    629:        }
                    630:        else if (!ours) {
                    631:                ip6_forward(m, 0);
                    632:                return;
                    633:        }
                    634:
                    635:        /*
                    636:         * Tell launch routine the next header
                    637:         */
1.12      itojun    638: #ifdef IFA_STATS
1.9       itojun    639:        if (IFA_STATS && deliverifp != NULL) {
                    640:                struct in6_ifaddr *ia6;
                    641:                ip6 = mtod(m, struct ip6_hdr *);
                    642:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    643:                if (ia6)
                    644:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    645:        }
                    646: #endif
1.2       itojun    647:        ip6stat.ip6s_delivered++;
1.9       itojun    648:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    649:        nest = 0;
                    650:        while (nxt != IPPROTO_DONE) {
                    651:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    652:                        ip6stat.ip6s_toomanyhdr++;
                    653:                        goto bad;
                    654:                }
1.8       itojun    655:
                    656:                /*
                    657:                 * protection against faulty packet - there should be
                    658:                 * more sanity checks in header chain processing.
                    659:                 */
                    660:                if (m->m_pkthdr.len < off) {
                    661:                        ip6stat.ip6s_tooshort++;
1.9       itojun    662:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    663:                        goto bad;
                    664:                }
                    665:
1.2       itojun    666:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    667:        }
                    668:        return;
                    669:  bad:
                    670:        m_freem(m);
                    671: }
                    672:
                    673: /*
                    674:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    675:  * included, the real payload length will be stored in plenp.
                    676:  */
                    677: static int
                    678: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    679:        u_int32_t *plenp;
1.5       itojun    680:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    681:        struct mbuf **mp;
                    682:        int *offp;
                    683: {
                    684:        register struct mbuf *m = *mp;
                    685:        int off = *offp, hbhlen;
                    686:        struct ip6_hbh *hbh;
                    687:        u_int8_t *opt;
                    688:
                    689:        /* validation of the length of the header */
1.9       itojun    690: #ifndef PULLDOWN_TEST
1.2       itojun    691:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
                    692:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    693:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    694:
                    695:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
                    696:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9       itojun    697: #else
                    698:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    699:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    700:        if (hbh == NULL) {
                    701:                ip6stat.ip6s_tooshort++;
                    702:                return -1;
                    703:        }
                    704:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    705:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    706:                hbhlen);
                    707:        if (hbh == NULL) {
                    708:                ip6stat.ip6s_tooshort++;
                    709:                return -1;
                    710:        }
                    711: #endif
1.2       itojun    712:        off += hbhlen;
                    713:        hbhlen -= sizeof(struct ip6_hbh);
                    714:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    715:
                    716:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    717:                                hbhlen, rtalertp, plenp) < 0)
                    718:                return(-1);
                    719:
                    720:        *offp = off;
                    721:        *mp = m;
                    722:        return(0);
                    723: }
                    724:
                    725: /*
                    726:  * Search header for all Hop-by-hop options and process each option.
                    727:  * This function is separate from ip6_hopopts_input() in order to
                    728:  * handle a case where the sending node itself process its hop-by-hop
                    729:  * options header. In such a case, the function is called from ip6_output().
                    730:  */
                    731: int
                    732: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    733:        struct mbuf *m;
                    734:        u_int8_t *opthead;
                    735:        int hbhlen;
1.5       itojun    736:        u_int32_t *rtalertp;
1.2       itojun    737:        u_int32_t *plenp;
                    738: {
                    739:        struct ip6_hdr *ip6;
                    740:        int optlen = 0;
                    741:        u_int8_t *opt = opthead;
                    742:        u_int16_t rtalert_val;
                    743:
                    744:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
                    745:                switch(*opt) {
                    746:                 case IP6OPT_PAD1:
                    747:                         optlen = 1;
                    748:                         break;
                    749:                 case IP6OPT_PADN:
                    750:                         if (hbhlen < IP6OPT_MINLEN) {
                    751:                                 ip6stat.ip6s_toosmall++;
                    752:                                 goto bad;
                    753:                         }
                    754:                         optlen = *(opt + 1) + 2;
                    755:                         break;
                    756:                 case IP6OPT_RTALERT:
1.8       itojun    757:                         /* XXX may need check for alignment */
1.2       itojun    758:                         if (hbhlen < IP6OPT_RTALERT_LEN) {
                    759:                                 ip6stat.ip6s_toosmall++;
                    760:                                 goto bad;
                    761:                         }
                    762:                         if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
                    763:                                  /* XXX: should we discard the packet? */
                    764:                                 log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
                    765:                                     *(opt + 1));
                    766:                         optlen = IP6OPT_RTALERT_LEN;
                    767:                         bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    768:                         *rtalertp = ntohs(rtalert_val);
                    769:                         break;
                    770:                 case IP6OPT_JUMBO:
1.8       itojun    771:                         /* XXX may need check for alignment */
1.2       itojun    772:                         if (hbhlen < IP6OPT_JUMBO_LEN) {
                    773:                                 ip6stat.ip6s_toosmall++;
                    774:                                 goto bad;
                    775:                         }
                    776:                         if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
                    777:                                  /* XXX: should we discard the packet? */
                    778:                                 log(LOG_ERR, "length of jumbopayload opt "
                    779:                                     "is inconsistent(%d)",
                    780:                                     *(opt + 1));
                    781:                         optlen = IP6OPT_JUMBO_LEN;
                    782:
                    783:                         /*
                    784:                          * We can simply cast because of the alignment
                    785:                          * requirement of the jumbo payload option.
                    786:                          */
1.8       itojun    787: #if 0
1.2       itojun    788:                         *plenp = ntohl(*(u_int32_t *)(opt + 2));
1.8       itojun    789: #else
                    790:                         bcopy(opt + 2, plenp, sizeof(*plenp));
                    791:                         *plenp = htonl(*plenp);
                    792: #endif
1.2       itojun    793:                         if (*plenp <= IPV6_MAXPACKET) {
                    794:                                 /*
                    795:                                  * jumbo payload length must be larger
                    796:                                  * than 65535
                    797:                                  */
                    798:                                 ip6stat.ip6s_badoptions++;
                    799:                                 icmp6_error(m, ICMP6_PARAM_PROB,
                    800:                                             ICMP6_PARAMPROB_HEADER,
                    801:                                             sizeof(struct ip6_hdr) +
                    802:                                             sizeof(struct ip6_hbh) +
                    803:                                             opt + 2 - opthead);
                    804:                                 return(-1);
                    805:                         }
                    806:
                    807:                         ip6 = mtod(m, struct ip6_hdr *);
                    808:                         if (ip6->ip6_plen) {
                    809:                                 /*
                    810:                                  * IPv6 packets that have non 0 payload length
                    811:                                  * must not contain a jumbo paylod option.
                    812:                                  */
                    813:                                 ip6stat.ip6s_badoptions++;
                    814:                                 icmp6_error(m, ICMP6_PARAM_PROB,
                    815:                                             ICMP6_PARAMPROB_HEADER,
                    816:                                             sizeof(struct ip6_hdr) +
                    817:                                             sizeof(struct ip6_hbh) +
                    818:                                             opt - opthead);
                    819:                                 return(-1);
                    820:                         }
                    821:                         break;
                    822:                 default:               /* unknown option */
                    823:                         if (hbhlen < IP6OPT_MINLEN) {
                    824:                                 ip6stat.ip6s_toosmall++;
                    825:                                 goto bad;
                    826:                         }
                    827:                         if ((optlen = ip6_unknown_opt(opt, m,
                    828:                                                       sizeof(struct ip6_hdr) +
                    829:                                                       sizeof(struct ip6_hbh) +
                    830:                                                       opt - opthead)) == -1)
                    831:                                 return(-1);
                    832:                         optlen += 2;
                    833:                         break;
                    834:                }
                    835:        }
                    836:
                    837:        return(0);
                    838:
                    839:   bad:
                    840:        m_freem(m);
                    841:        return(-1);
                    842: }
                    843:
                    844: /*
                    845:  * Unknown option processing.
                    846:  * The third argument `off' is the offset from the IPv6 header to the option,
                    847:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    848:  * is not continuous in order to return an ICMPv6 error.
                    849:  */
                    850: int
                    851: ip6_unknown_opt(optp, m, off)
                    852:        u_int8_t *optp;
                    853:        struct mbuf *m;
                    854:        int off;
                    855: {
                    856:        struct ip6_hdr *ip6;
                    857:
                    858:        switch(IP6OPT_TYPE(*optp)) {
                    859:         case IP6OPT_TYPE_SKIP: /* ignore the option */
                    860:                 return((int)*(optp + 1));
                    861:         case IP6OPT_TYPE_DISCARD:      /* silently discard */
                    862:                 m_freem(m);
                    863:                 return(-1);
                    864:         case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    865:                 ip6stat.ip6s_badoptions++;
                    866:                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
                    867:                 return(-1);
                    868:         case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    869:                 ip6stat.ip6s_badoptions++;
                    870:                 ip6 = mtod(m, struct ip6_hdr *);
                    871:                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    872:                     (m->m_flags & (M_BCAST|M_MCAST)))
                    873:                         m_freem(m);
                    874:                 else
                    875:                         icmp6_error(m, ICMP6_PARAM_PROB,
                    876:                                     ICMP6_PARAMPROB_OPTION, off);
                    877:                 return(-1);
                    878:        }
                    879:
                    880:        m_freem(m);             /* XXX: NOTREACHED */
                    881:        return(-1);
                    882: }
                    883:
                    884: /*
1.9       itojun    885:  * Create the "control" list for this pcb.
                    886:  *
                    887:  * The routine will be called from upper layer handlers like tcp6_input().
                    888:  * Thus the routine assumes that the caller (tcp6_input) have already
                    889:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                    890:  * very first mbuf on the mbuf chain.
                    891:  * We may want to add some infinite loop prevention or sanity checks for safety.
                    892:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                    893:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun    894:  */
                    895: void
                    896: ip6_savecontrol(in6p, mp, ip6, m)
                    897:        register struct in6pcb *in6p;
                    898:        register struct mbuf **mp;
                    899:        register struct ip6_hdr *ip6;
                    900:        register struct mbuf *m;
                    901: {
                    902:        struct proc *p = curproc;       /* XXX */
1.9       itojun    903:        int privileged;
1.2       itojun    904:
1.9       itojun    905:        privileged = 0;
                    906:        if (p && !suser(p->p_ucred, &p->p_acflag))
                    907:                privileged++;
                    908:
                    909: #ifdef SO_TIMESTAMP
1.2       itojun    910:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                    911:                struct timeval tv;
                    912:
                    913:                microtime(&tv);
                    914:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                    915:                        SCM_TIMESTAMP, SOL_SOCKET);
                    916:                if (*mp)
                    917:                        mp = &(*mp)->m_next;
                    918:        }
1.9       itojun    919: #endif
1.2       itojun    920:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                    921:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
                    922:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
                    923:                        IPPROTO_IPV6);
                    924:                if (*mp)
                    925:                        mp = &(*mp)->m_next;
                    926:        }
                    927:
                    928: #ifdef noyet
                    929:        /* options were tossed above */
                    930:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                    931:                /* broken */
                    932:        /* ip6_srcroute doesn't do what we want here, need to fix */
                    933:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                    934:                /* broken */
                    935: #endif
                    936:
                    937:        /* RFC 2292 sec. 5 */
                    938:        if (in6p->in6p_flags & IN6P_PKTINFO) {
                    939:                struct in6_pktinfo pi6;
                    940:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                    941:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                    942:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                    943:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                    944:                                        ? m->m_pkthdr.rcvif->if_index
                    945:                                        : 0;
                    946:                *mp = sbcreatecontrol((caddr_t) &pi6,
                    947:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
                    948:                        IPPROTO_IPV6);
                    949:                if (*mp)
                    950:                        mp = &(*mp)->m_next;
                    951:        }
                    952:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                    953:                int hlim = ip6->ip6_hlim & 0xff;
                    954:                *mp = sbcreatecontrol((caddr_t) &hlim,
                    955:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
                    956:                if (*mp)
                    957:                        mp = &(*mp)->m_next;
                    958:        }
                    959:        /* IN6P_NEXTHOP - for outgoing packet only */
                    960:
                    961:        /*
                    962:         * IPV6_HOPOPTS socket option. We require super-user privilege
                    963:         * for the option, but it might be too strict, since there might
                    964:         * be some hop-by-hop options which can be returned to normal user.
                    965:         * See RFC 2292 section 6.
                    966:         */
1.9       itojun    967:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun    968:                /*
                    969:                 * Check if a hop-by-hop options header is contatined in the
                    970:                 * received packet, and if so, store the options as ancillary
                    971:                 * data. Note that a hop-by-hop options header must be
                    972:                 * just after the IPv6 header, which fact is assured through
                    973:                 * the IPv6 input processing.
                    974:                 */
                    975:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                    976:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    977:                        struct ip6_hbh *hbh;
                    978:                        int hbhlen;
                    979:
                    980: #ifndef PULLDOWN_TEST
                    981:                        hbh = (struct ip6_hbh *)(ip6 + 1);
                    982:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                    983: #else
                    984:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    985:                                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    986:                        if (hbh == NULL) {
                    987:                                ip6stat.ip6s_tooshort++;
                    988:                                return;
                    989:                        }
                    990:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                    991:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    992:                                sizeof(struct ip6_hdr), hbhlen);
                    993:                        if (hbh == NULL) {
                    994:                                ip6stat.ip6s_tooshort++;
                    995:                                return;
                    996:                        }
                    997: #endif
1.2       itojun    998:
                    999:                        /*
                   1000:                         * XXX: We copy whole the header even if a jumbo
                   1001:                         * payload option is included, which option is to
                   1002:                         * be removed before returning in the RFC 2292.
                   1003:                         * But it's too painful operation...
                   1004:                         */
1.9       itojun   1005:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2       itojun   1006:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
                   1007:                        if (*mp)
                   1008:                                mp = &(*mp)->m_next;
                   1009:                }
                   1010:        }
                   1011:
                   1012:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1013:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1014:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1015:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
                   1016:
                   1017:                /*
                   1018:                 * Search for destination options headers or routing
                   1019:                 * header(s) through the header chain, and stores each
                   1020:                 * header as ancillary data.
                   1021:                 * Note that the order of the headers remains in
                   1022:                 * the chain of ancillary data.
                   1023:                 */
                   1024:                while(1) {      /* is explicit loop prevention necessary? */
1.9       itojun   1025:                        struct ip6_ext *ip6e;
                   1026:                        int elen;
                   1027:
                   1028: #ifndef PULLDOWN_TEST
                   1029:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
                   1030:                        if (nxt == IPPROTO_AH)
                   1031:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1032:                        else
                   1033:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1034: #else
                   1035:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
                   1036:                                sizeof(struct ip6_ext));
                   1037:                        if (ip6e == NULL) {
                   1038:                                ip6stat.ip6s_tooshort++;
                   1039:                                return;
                   1040:                        }
                   1041:                        if (nxt == IPPROTO_AH)
                   1042:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1043:                        else
                   1044:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1045:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
                   1046:                        if (ip6e == NULL) {
                   1047:                                ip6stat.ip6s_tooshort++;
                   1048:                                return;
                   1049:                        }
                   1050: #endif
1.2       itojun   1051:
                   1052:                        switch(nxt) {
                   1053:                         case IPPROTO_DSTOPTS:
                   1054:                                 if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1055:                                         break;
                   1056:
                   1057:                                 /*
                   1058:                                  * We also require super-user privilege for
                   1059:                                  * the option.
                   1060:                                  * See the comments on IN6_HOPOPTS.
                   1061:                                  */
1.9       itojun   1062:                                 if (!privileged)
1.2       itojun   1063:                                         break;
                   1064:
1.9       itojun   1065:                                 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2       itojun   1066:                                                       IPV6_DSTOPTS,
                   1067:                                                       IPPROTO_IPV6);
                   1068:                                 if (*mp)
                   1069:                                         mp = &(*mp)->m_next;
                   1070:                                 break;
                   1071:
                   1072:                         case IPPROTO_ROUTING:
                   1073:                                 if (!in6p->in6p_flags & IN6P_RTHDR)
                   1074:                                         break;
                   1075:
1.9       itojun   1076:                                 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2       itojun   1077:                                                       IPV6_RTHDR,
                   1078:                                                       IPPROTO_IPV6);
                   1079:                                 if (*mp)
                   1080:                                         mp = &(*mp)->m_next;
                   1081:                                 break;
                   1082:
                   1083:                         case IPPROTO_UDP:
                   1084:                         case IPPROTO_TCP:
                   1085:                         case IPPROTO_ICMPV6:
                   1086:                         default:
                   1087:                                 /*
                   1088:                                  * stop search if we encounter an upper
                   1089:                                  * layer protocol headers.
                   1090:                                  */
                   1091:                                 goto loopend;
                   1092:
                   1093:                         case IPPROTO_HOPOPTS:
                   1094:                         case IPPROTO_AH: /* is it possible? */
                   1095:                                 break;
                   1096:                        }
                   1097:
                   1098:                        /* proceed with the next header. */
1.9       itojun   1099:                        off += elen;
1.2       itojun   1100:                        nxt = ip6e->ip6e_nxt;
                   1101:                }
                   1102:          loopend:
                   1103:        }
1.9       itojun   1104:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun   1105:                /* to be done */
                   1106:        }
1.9       itojun   1107:        if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2       itojun   1108:                /* to be done */
                   1109:        }
                   1110:        /* IN6P_RTHDR - to be done */
                   1111:
                   1112: }
                   1113:
                   1114: /*
                   1115:  * Get pointer to the previous header followed by the header
                   1116:  * currently processed.
                   1117:  * XXX: This function supposes that
                   1118:  *     M includes all headers,
                   1119:  *     the next header field and the header length field of each header
                   1120:  *     are valid, and
                   1121:  *     the sum of each header length equals to OFF.
                   1122:  * Because of these assumptions, this function must be called very
                   1123:  * carefully. Moreover, it will not be used in the near future when
                   1124:  * we develop `neater' mechanism to process extension headers.
                   1125:  */
                   1126: char *
                   1127: ip6_get_prevhdr(m, off)
                   1128:        struct mbuf *m;
                   1129:        int off;
                   1130: {
                   1131:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1132:
                   1133:        if (off == sizeof(struct ip6_hdr))
                   1134:                return(&ip6->ip6_nxt);
                   1135:        else {
                   1136:                int len, nxt;
                   1137:                struct ip6_ext *ip6e = NULL;
                   1138:
                   1139:                nxt = ip6->ip6_nxt;
                   1140:                len = sizeof(struct ip6_hdr);
                   1141:                while (len < off) {
                   1142:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1143:
                   1144:                        switch(nxt) {
                   1145:                        case IPPROTO_FRAGMENT:
                   1146:                                len += sizeof(struct ip6_frag);
                   1147:                                break;
                   1148:                        case IPPROTO_AH:
                   1149:                                len += (ip6e->ip6e_len + 2) << 2;
                   1150:                                break;
                   1151:                        default:
                   1152:                                len += (ip6e->ip6e_len + 1) << 3;
                   1153:                                break;
                   1154:                        }
                   1155:                        nxt = ip6e->ip6e_nxt;
                   1156:                }
                   1157:                if (ip6e)
                   1158:                        return(&ip6e->ip6e_nxt);
                   1159:                else
                   1160:                        return NULL;
1.18      itojun   1161:        }
                   1162: }
                   1163:
                   1164: /*
                   1165:  * get next header offset.  m will be retained.
                   1166:  */
                   1167: int
                   1168: ip6_nexthdr(m, off, proto, nxtp)
                   1169:        struct mbuf *m;
                   1170:        int off;
                   1171:        int proto;
                   1172:        int *nxtp;
                   1173: {
                   1174:        struct ip6_hdr ip6;
                   1175:        struct ip6_ext ip6e;
                   1176:        struct ip6_frag fh;
                   1177:
                   1178:        /* just in case */
                   1179:        if (m == NULL)
                   1180:                panic("ip6_nexthdr: m == NULL");
                   1181:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1182:                return -1;
                   1183:
                   1184:        switch (proto) {
                   1185:        case IPPROTO_IPV6:
                   1186:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1187:                        return -1;
                   1188:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1189:                if (nxtp)
                   1190:                        *nxtp = ip6.ip6_nxt;
                   1191:                off += sizeof(ip6);
                   1192:                return off;
                   1193:
                   1194:        case IPPROTO_FRAGMENT:
                   1195:                /*
                   1196:                 * terminate parsing if it is not the first fragment,
                   1197:                 * it does not make sense to parse through it.
                   1198:                 */
                   1199:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1200:                        return -1;
                   1201:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
                   1202:                if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
                   1203:                        return -1;
                   1204:                if (nxtp)
                   1205:                        *nxtp = fh.ip6f_nxt;
                   1206:                off += sizeof(struct ip6_frag);
                   1207:                return off;
                   1208:
                   1209:        case IPPROTO_AH:
                   1210:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1211:                        return -1;
                   1212:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1213:                if (nxtp)
                   1214:                        *nxtp = ip6e.ip6e_nxt;
                   1215:                off += (ip6e.ip6e_len + 2) << 2;
                   1216:                return off;
                   1217:
                   1218:        case IPPROTO_HOPOPTS:
                   1219:        case IPPROTO_ROUTING:
                   1220:        case IPPROTO_DSTOPTS:
                   1221:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1222:                        return -1;
                   1223:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1224:                if (nxtp)
                   1225:                        *nxtp = ip6e.ip6e_nxt;
                   1226:                off += (ip6e.ip6e_len + 1) << 3;
                   1227:                return off;
                   1228:
                   1229:        case IPPROTO_NONE:
                   1230:        case IPPROTO_ESP:
                   1231:        case IPPROTO_IPCOMP:
                   1232:                /* give up */
                   1233:                return -1;
                   1234:
                   1235:        default:
                   1236:                return -1;
                   1237:        }
                   1238:
                   1239:        return -1;
                   1240: }
                   1241:
                   1242: /*
                   1243:  * get offset for the last header in the chain.  m will be kept untainted.
                   1244:  */
                   1245: int
                   1246: ip6_lasthdr(m, off, proto, nxtp)
                   1247:        struct mbuf *m;
                   1248:        int off;
                   1249:        int proto;
                   1250:        int *nxtp;
                   1251: {
                   1252:        int newoff;
                   1253:        int nxt;
                   1254:
                   1255:        if (!nxtp) {
                   1256:                nxt = -1;
                   1257:                nxtp = &nxt;
                   1258:        }
                   1259:        while (1) {
                   1260:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1261:                if (newoff < 0)
                   1262:                        return off;
                   1263:                else if (newoff < off)
                   1264:                        return -1;      /* invalid */
                   1265:                else if (newoff == off)
                   1266:                        return newoff;
                   1267:
                   1268:                off = newoff;
                   1269:                proto = *nxtp;
1.2       itojun   1270:        }
                   1271: }
                   1272:
                   1273: /*
                   1274:  * System control for IP6
                   1275:  */
                   1276:
                   1277: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1278:        0,              0,              0,              0,
                   1279:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1280:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1281:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1282:        0,              0,              0,              0,
                   1283:        ENOPROTOOPT
                   1284: };
                   1285:
                   1286: #include <vm/vm.h>
                   1287: #include <sys/sysctl.h>
                   1288:
                   1289: int
                   1290: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1291:        int *name;
                   1292:        u_int namelen;
                   1293:        void *oldp;
                   1294:        size_t *oldlenp;
                   1295:        void *newp;
                   1296:        size_t newlen;
                   1297: {
                   1298:        /* All sysctl names at this level are terminal. */
                   1299:        if (namelen != 1)
                   1300:                return ENOTDIR;
                   1301:
                   1302:        switch (name[0]) {
                   1303:
                   1304:        case IPV6CTL_FORWARDING:
                   1305:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1306:                                  &ip6_forwarding);
                   1307:        case IPV6CTL_SENDREDIRECTS:
                   1308:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1309:                                &ip6_sendredirects);
                   1310:        case IPV6CTL_DEFHLIM:
                   1311:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                   1312:        case IPV6CTL_MAXFRAGPACKETS:
                   1313:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1314:                                &ip6_maxfragpackets);
                   1315:        case IPV6CTL_ACCEPT_RTADV:
                   1316:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1317:                                &ip6_accept_rtadv);
                   1318:        case IPV6CTL_KEEPFAITH:
                   1319:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                   1320:        case IPV6CTL_LOG_INTERVAL:
                   1321:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1322:                                &ip6_log_interval);
                   1323:        case IPV6CTL_HDRNESTLIMIT:
                   1324:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1325:                                &ip6_hdrnestlimit);
                   1326:        case IPV6CTL_DAD_COUNT:
                   1327:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1328:        case IPV6CTL_AUTO_FLOWLABEL:
                   1329:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1330:                                &ip6_auto_flowlabel);
                   1331:        case IPV6CTL_DEFMCASTHLIM:
                   1332:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1333:                                &ip6_defmcasthlim);
                   1334:        case IPV6CTL_GIF_HLIM:
                   1335:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1336:                                &ip6_gif_hlim);
                   1337:        case IPV6CTL_KAME_VERSION:
                   1338:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9       itojun   1339:        case IPV6CTL_USE_DEPRECATED:
                   1340:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1341:                                &ip6_use_deprecated);
1.10      itojun   1342:        case IPV6CTL_RR_PRUNE:
                   1343:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12      itojun   1344: #ifndef INET6_BINDV6ONLY
1.11      itojun   1345:        case IPV6CTL_BINDV6ONLY:
                   1346:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1347:                                &ip6_bindv6only);
                   1348: #endif
1.2       itojun   1349:        default:
                   1350:                return EOPNOTSUPP;
                   1351:        }
                   1352:        /* NOTREACHED */
                   1353: }

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