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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.86.2.1

1.86.2.1! chap        1: /*     $NetBSD: ip6_input.c,v 1.88 2006/05/25 21:32:47 bouyer Exp $    */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
1.65      agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.86.2.1! chap       65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.88 2006/05/25 21:32:47 bouyer Exp $");
1.2       itojun     66:
                     67: #include "opt_inet.h"
1.85      rpaulo     68: #include "opt_inet6.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>
1.46      simonb     85: #include <sys/sysctl.h>
1.2       itojun     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>
1.45      itojun    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>
1.81      rpaulo    107: #include <netinet6/scope6_var.h>
1.2       itojun    108: #include <netinet6/in6_ifattach.h>
                    109: #include <netinet6/nd6.h>
                    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: #include "faith.h"
                    118: #include "gif.h"
1.50      itojun    119:
                    120: #if NGIF > 0
                    121: #include <netinet6/in6_gif.h>
                    122: #endif
1.2       itojun    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:
1.83      rpaulo    133: extern struct callout in6_tmpaddrtimer_ch;
                    134:
1.2       itojun    135: int ip6_forward_srcrt;                 /* XXX */
                    136: int ip6_sourcecheck;                   /* XXX */
                    137: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    138:
1.29      thorpej   139: #ifdef PFIL_HOOKS
                    140: struct pfil_head inet6_pfil_hook;
                    141: #endif
                    142:
1.2       itojun    143: struct ip6stat ip6stat;
                    144:
                    145: static void ip6_init2 __P((void *));
1.81      rpaulo    146: static struct m_tag *ip6_setdstifaddr __P((struct mbuf *, struct in6_ifaddr *));
1.2       itojun    147:
1.5       itojun    148: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.62      itojun    149: static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int));
1.2       itojun    150:
                    151: /*
                    152:  * IP6 initialization: fill in IP6 protocol switch table.
                    153:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    154:  */
                    155: void
                    156: ip6_init()
                    157: {
1.78      christos  158:        const struct ip6protosw *pr;
1.35      itojun    159:        int i;
1.2       itojun    160:
1.78      christos  161:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    162:        if (pr == 0)
                    163:                panic("ip6_init");
                    164:        for (i = 0; i < IPPROTO_MAX; i++)
                    165:                ip6_protox[i] = pr - inet6sw;
1.78      christos  166:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    167:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    168:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    169:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    170:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    171:        ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81      rpaulo    172:        scope6_init();
                    173:        addrsel_policy_init();
1.2       itojun    174:        nd6_init();
                    175:        frag6_init();
1.83      rpaulo    176:        ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    177:
                    178:        ip6_init2((void *)0);
1.29      thorpej   179:
                    180: #ifdef PFIL_HOOKS
                    181:        /* Register our Packet Filter hook. */
1.33      thorpej   182:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    183:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   184:        i = pfil_head_register(&inet6_pfil_hook);
                    185:        if (i != 0)
                    186:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    187:                    "error %d\n", i);
                    188: #endif /* PFIL_HOOKS */
1.2       itojun    189: }
                    190:
                    191: static void
                    192: ip6_init2(dummy)
                    193:        void *dummy;
                    194: {
                    195:
                    196:        /* nd6_timer_init */
1.19      thorpej   197:        callout_init(&nd6_timer_ch);
                    198:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    199:
                    200:        /* timer for regeneranation of temporary addresses randomize ID */
                    201:        callout_init(&in6_tmpaddrtimer_ch);
                    202:        callout_reset(&in6_tmpaddrtimer_ch,
                    203:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    204:                       ip6_temp_regen_advance) * hz,
                    205:                      in6_tmpaddrtimer, NULL);
1.2       itojun    206: }
                    207:
                    208: /*
                    209:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    210:  */
                    211: void
                    212: ip6intr()
                    213: {
                    214:        int s;
                    215:        struct mbuf *m;
                    216:
                    217:        for (;;) {
1.41      thorpej   218:                s = splnet();
1.2       itojun    219:                IF_DEQUEUE(&ip6intrq, m);
                    220:                splx(s);
                    221:                if (m == 0)
                    222:                        return;
1.83      rpaulo    223:                /* drop the packet if IPv6 operation is disabled on the IF */
                    224:                if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    225:                        m_freem(m);
                    226:                        return;
                    227:                }
1.2       itojun    228:                ip6_input(m);
                    229:        }
                    230: }
                    231:
                    232: extern struct  route_in6 ip6_forward_rt;
                    233:
                    234: void
                    235: ip6_input(m)
                    236:        struct mbuf *m;
                    237: {
1.9       itojun    238:        struct ip6_hdr *ip6;
1.2       itojun    239:        int off = sizeof(struct ip6_hdr), nest;
                    240:        u_int32_t plen;
1.5       itojun    241:        u_int32_t rtalert = ~0;
1.2       itojun    242:        int nxt, ours = 0;
1.9       itojun    243:        struct ifnet *deliverifp = NULL;
1.64      itojun    244:        int srcrt = 0;
1.2       itojun    245:
                    246: #ifdef IPSEC
                    247:        /*
                    248:         * should the inner packet be considered authentic?
                    249:         * see comment in ah4_input().
                    250:         */
1.49      itojun    251:        m->m_flags &= ~M_AUTHIPHDR;
                    252:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    253: #endif
1.9       itojun    254:
1.2       itojun    255:        /*
1.81      rpaulo    256:         * make sure we don't have onion peering information into m_tag.
                    257:         */
                    258:        ip6_delaux(m);
                    259:
                    260:        /*
1.44      itojun    261:         * mbuf statistics
1.2       itojun    262:         */
                    263:        if (m->m_flags & M_EXT) {
                    264:                if (m->m_next)
                    265:                        ip6stat.ip6s_mext2m++;
                    266:                else
                    267:                        ip6stat.ip6s_mext1++;
                    268:        } else {
1.40      itojun    269: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2       itojun    270:                if (m->m_next) {
1.9       itojun    271:                        if (m->m_flags & M_LOOP) {
1.77      peter     272:                                ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */
1.40      itojun    273:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    274:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    275:                        else
                    276:                                ip6stat.ip6s_m2m[0]++;
                    277:                } else
                    278:                        ip6stat.ip6s_m1++;
1.40      itojun    279: #undef M2MMAX
1.2       itojun    280:        }
                    281:
1.9       itojun    282:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    283:        ip6stat.ip6s_total++;
                    284:
1.57      thorpej   285:        /*
                    286:         * If the IPv6 header is not aligned, slurp it up into a new
                    287:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    288:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   289:         * IPv6 header is in the first mbuf of the chain.
                    290:         */
                    291:        if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    292:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    293:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    294:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    295:                        /* XXXJRT new stat, please */
                    296:                        ip6stat.ip6s_toosmall++;
                    297:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    298:                        return;
                    299:                }
                    300:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    301:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    302:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9       itojun    303:                        ip6stat.ip6s_toosmall++;
                    304:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    305:                        return;
                    306:                }
1.2       itojun    307:        }
                    308:
                    309:        ip6 = mtod(m, struct ip6_hdr *);
                    310:
                    311:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    312:                ip6stat.ip6s_badvers++;
1.9       itojun    313:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    314:                goto bad;
                    315:        }
1.15      darrenr   316:
                    317: #ifdef PFIL_HOOKS
                    318:        /*
                    319:         * Run through list of hooks for input packets.  If there are any
                    320:         * filters which require that additional packets in the flow are
                    321:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    322:         * Note that filters must _never_ set this flag, as another filter
                    323:         * in the list may have previously cleared it.
                    324:         */
1.39      itojun    325:        /*
                    326:         * let ipfilter look at packet on the wire,
                    327:         * not the decapsulated packet.
                    328:         */
                    329: #ifdef IPSEC
1.42      itojun    330:        if (!ipsec_getnhist(m))
1.39      itojun    331: #else
                    332:        if (1)
                    333: #endif
                    334:        {
1.64      itojun    335:                struct in6_addr odst;
                    336:
                    337:                odst = ip6->ip6_dst;
1.39      itojun    338:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    339:                                   PFIL_IN) != 0)
                    340:                        return;
                    341:                if (m == NULL)
                    342:                        return;
                    343:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    344:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    345:        }
1.15      darrenr   346: #endif /* PFIL_HOOKS */
                    347:
1.2       itojun    348:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    349:
1.30      thorpej   350: #ifdef ALTQ
                    351:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    352:                /* packet is dropped by traffic conditioner */
                    353:                return;
1.9       itojun    354:        }
                    355: #endif
                    356:
1.2       itojun    357:        /*
1.44      itojun    358:         * Check against address spoofing/corruption.
1.2       itojun    359:         */
                    360:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    361:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    362:                /*
                    363:                 * XXX: "badscope" is not very suitable for a multicast source.
                    364:                 */
1.2       itojun    365:                ip6stat.ip6s_badscope++;
1.9       itojun    366:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    367:                goto bad;
                    368:        }
1.13      itojun    369:        /*
1.44      itojun    370:         * The following check is not documented in specs.  A malicious
                    371:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    372:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    373:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    374:         *
1.44      itojun    375:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    376:         * support IPv4-less kernel compilation, we cannot support SIIT
                    377:         * environment at all.  So, it makes more sense for us to reject any
                    378:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       379:         * partial support for SIIT environment.
1.13      itojun    380:         */
                    381:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    382:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    383:                ip6stat.ip6s_badscope++;
                    384:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    385:                goto bad;
                    386:        }
1.17      itojun    387: #if 0
1.13      itojun    388:        /*
1.17      itojun    389:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    390:         *
                    391:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    392:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    393:         * is revised to forbid relaying case.
1.13      itojun    394:         */
                    395:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    396:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    397:                ip6stat.ip6s_badscope++;
                    398:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    399:                goto bad;
                    400:        }
                    401: #endif
1.35      itojun    402:
1.2       itojun    403:        /*
1.82      yamt      404:         * Disambiguate address scope zones (if there is ambiguity).
                    405:         * We first make sure that the original source or destination address
                    406:         * is not in our internal form for scoped addresses.  Such addresses
                    407:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    408:         * to the usage conflict.
                    409:         * in6_setscope() then also checks and rejects the cases where src or
                    410:         * dst are the loopback address and the receiving interface
                    411:         * is not loopback.
                    412:         */
1.86.2.1! chap      413:        if (__predict_false(
        !           414:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
        !           415:                goto bad;
        !           416:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      417:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
                    418:                ip6stat.ip6s_badscope++; /* XXX */
                    419:                goto bad;
                    420:        }
                    421:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    422:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
                    423:                ip6stat.ip6s_badscope++;
                    424:                goto bad;
                    425:        }
                    426:
                    427:        /*
1.2       itojun    428:         * Multicast check
                    429:         */
                    430:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    431:                struct  in6_multi *in6m = 0;
1.9       itojun    432:
                    433:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    434:                /*
                    435:                 * See if we belong to the destination multicast group on the
                    436:                 * arrival interface.
                    437:                 */
                    438:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    439:                if (in6m)
                    440:                        ours = 1;
                    441:                else if (!ip6_mrouter) {
                    442:                        ip6stat.ip6s_notmember++;
                    443:                        ip6stat.ip6s_cantforward++;
1.9       itojun    444:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    445:                        goto bad;
                    446:                }
1.9       itojun    447:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    448:                goto hbhcheck;
                    449:        }
                    450:
                    451:        /*
                    452:         *  Unicast check
                    453:         */
1.22      itojun    454:        if (ip6_forward_rt.ro_rt != NULL &&
1.55      itojun    455:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
1.22      itojun    456:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.72      itojun    457:            &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25      itojun    458:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    459:        else {
1.35      itojun    460:                struct sockaddr_in6 *dst6;
                    461:
1.2       itojun    462:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    463:                        /* route is down or destination is different */
1.25      itojun    464:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    465:                        RTFREE(ip6_forward_rt.ro_rt);
                    466:                        ip6_forward_rt.ro_rt = 0;
                    467:                }
1.22      itojun    468:
1.2       itojun    469:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35      itojun    470:                dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
                    471:                dst6->sin6_len = sizeof(struct sockaddr_in6);
                    472:                dst6->sin6_family = AF_INET6;
                    473:                dst6->sin6_addr = ip6->ip6_dst;
1.2       itojun    474:
1.9       itojun    475:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    476:        }
                    477:
                    478: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    479:
                    480:        /*
                    481:         * Accept the packet if the forwarding interface to the destination
                    482:         * according to the routing table is the loopback interface,
                    483:         * unless the associated route has a gateway.
                    484:         * Note that this approach causes to accept a packet if there is a
                    485:         * route to the loopback interface for the destination of the packet.
                    486:         * But we think it's even useful in some situations, e.g. when using
                    487:         * a special daemon which wants to intercept the packet.
                    488:         */
                    489:        if (ip6_forward_rt.ro_rt &&
                    490:            (ip6_forward_rt.ro_rt->rt_flags &
                    491:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.55      itojun    492:            !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2       itojun    493: #if 0
                    494:            /*
                    495:             * The check below is redundant since the comparison of
                    496:             * the destination and the key of the rtentry has
                    497:             * already done through looking up the routing table.
                    498:             */
                    499:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.55      itojun    500:            &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2       itojun    501: #endif
1.9       itojun    502:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    503:                struct in6_ifaddr *ia6 =
                    504:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    505:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    506:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    507:                /*
                    508:                 * packets to a tentative, duplicated, or somehow invalid
                    509:                 * address must not be accepted.
                    510:                 */
1.2       itojun    511:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    512:                        /* this address is ready */
1.2       itojun    513:                        ours = 1;
1.9       itojun    514:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    515:                        goto hbhcheck;
                    516:                } else {
1.24      itojun    517:                        /* address is not ready, so discard the packet. */
1.34      itojun    518:                        nd6log((LOG_INFO,
1.27      itojun    519:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    520:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    521:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    522:
                    523:                        goto bad;
1.2       itojun    524:                }
                    525:        }
                    526:
                    527:        /*
1.55      itojun    528:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    529:         */
                    530: #if defined(NFAITH) && 0 < NFAITH
                    531:        if (ip6_keepfaith) {
1.71      itojun    532:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp &&
                    533:                    ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    534:                        /* XXX do we need more sanity checks? */
                    535:                        ours = 1;
1.45      itojun    536:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9       itojun    537:                        goto hbhcheck;
                    538:                }
                    539:        }
                    540: #endif
                    541:
                    542: #if 0
                    543:     {
                    544:        /*
                    545:         * Last resort: check in6_ifaddr for incoming interface.
                    546:         * The code is here until I update the "goto ours hack" code above
                    547:         * working right.
                    548:         */
                    549:        struct ifaddr *ifa;
                    550:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    551:             ifa;
                    552:             ifa = ifa->ifa_list.tqe_next) {
                    553:                if (ifa->ifa_addr == NULL)
                    554:                        continue;       /* just for safety */
                    555:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    556:                        continue;
                    557:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    558:                        ours = 1;
                    559:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    560:                        goto hbhcheck;
                    561:                }
                    562:        }
1.9       itojun    563:     }
1.2       itojun    564: #endif
                    565:
                    566:        /*
                    567:         * Now there is no reason to process the packet if it's not our own
                    568:         * and we're not a router.
                    569:         */
                    570:        if (!ip6_forwarding) {
                    571:                ip6stat.ip6s_cantforward++;
1.9       itojun    572:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    573:                goto bad;
                    574:        }
                    575:
                    576:   hbhcheck:
                    577:        /*
1.81      rpaulo    578:         * record address information into m_tag, if we don't have one yet.
                    579:         * note that we are unable to record it, if the address is not listed
                    580:         * as our interface address (e.g. multicast addresses, addresses
                    581:         * within FAITH prefixes and such).
                    582:         */
                    583:        if (deliverifp && !ip6_getdstifaddr(m)) {
                    584:                struct in6_ifaddr *ia6;
                    585:
                    586:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    587:                if (ia6) {
                    588:                        if (!ip6_setdstifaddr(m, ia6)) {
                    589:                                /*
                    590:                                 * XXX maybe we should drop the packet here,
                    591:                                 * as we could not provide enough information
                    592:                                 * to the upper layers.
                    593:                                 */
                    594:                        }
                    595:                }
                    596:        }
                    597:
                    598:        /*
1.2       itojun    599:         * Process Hop-by-Hop options header if it's contained.
                    600:         * m may be modified in ip6_hopopts_input().
                    601:         * If a JumboPayload option is included, plen will also be modified.
                    602:         */
                    603:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    604:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    605:                struct ip6_hbh *hbh;
                    606:
                    607:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    608: #if 0  /*touches NULL pointer*/
                    609:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    610: #endif
1.2       itojun    611:                        return; /* m have already been freed */
1.9       itojun    612:                }
1.22      itojun    613:
1.2       itojun    614:                /* adjust pointer */
                    615:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    616:
                    617:                /*
1.49      itojun    618:                 * if the payload length field is 0 and the next header field
1.22      itojun    619:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    620:                 * option MUST be included.
                    621:                 */
                    622:                if (ip6->ip6_plen == 0 && plen == 0) {
                    623:                        /*
                    624:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    625:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    626:                         * (non-zero) payload length to the variable plen.
1.22      itojun    627:                         */
                    628:                        ip6stat.ip6s_badoptions++;
                    629:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    630:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    631:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    632:                                    ICMP6_PARAMPROB_HEADER,
                    633:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    634:                        return;
                    635:                }
1.9       itojun    636:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    637:                        sizeof(struct ip6_hbh));
                    638:                if (hbh == NULL) {
                    639:                        ip6stat.ip6s_tooshort++;
                    640:                        return;
                    641:                }
1.57      thorpej   642:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    643:                nxt = hbh->ip6h_nxt;
1.2       itojun    644:
                    645:                /*
                    646:                 * accept the packet if a router alert option is included
                    647:                 * and we act as an IPv6 router.
                    648:                 */
1.5       itojun    649:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    650:                        ours = 1;
                    651:        } else
                    652:                nxt = ip6->ip6_nxt;
                    653:
                    654:        /*
                    655:         * Check that the amount of data in the buffers
                    656:         * is as at least much as the IPv6 header would have us expect.
                    657:         * Trim mbufs if longer than we expect.
                    658:         * Drop packet if shorter than we expect.
                    659:         */
                    660:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    661:                ip6stat.ip6s_tooshort++;
1.9       itojun    662:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    663:                goto bad;
                    664:        }
                    665:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    666:                if (m->m_len == m->m_pkthdr.len) {
                    667:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    668:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    669:                } else
                    670:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    671:        }
                    672:
                    673:        /*
                    674:         * Forward if desirable.
                    675:         */
                    676:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    677:                /*
                    678:                 * If we are acting as a multicast router, all
                    679:                 * incoming multicast packets are passed to the
                    680:                 * kernel-level multicast forwarding function.
                    681:                 * The packet is returned (relatively) intact; if
                    682:                 * ip6_mforward() returns a non-zero value, the packet
                    683:                 * must be discarded, else it may be accepted below.
                    684:                 */
                    685:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    686:                        ip6stat.ip6s_cantforward++;
                    687:                        m_freem(m);
                    688:                        return;
                    689:                }
                    690:                if (!ours) {
                    691:                        m_freem(m);
                    692:                        return;
                    693:                }
1.22      itojun    694:        } else if (!ours) {
1.64      itojun    695:                ip6_forward(m, srcrt);
1.2       itojun    696:                return;
1.56      itojun    697:        }
1.25      itojun    698:
                    699:        ip6 = mtod(m, struct ip6_hdr *);
                    700:
                    701:        /*
                    702:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    703:         * tcp/udp stack and bypass security checks (act as if it was from
                    704:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    705:         *
                    706:         * For SIIT end node behavior, you may want to disable the check.
                    707:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    708:         * source.
                    709:         */
                    710:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    711:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    712:                ip6stat.ip6s_badscope++;
                    713:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    714:                goto bad;
                    715:        }
1.2       itojun    716:
                    717:        /*
                    718:         * Tell launch routine the next header
                    719:         */
1.12      itojun    720: #ifdef IFA_STATS
1.28      itojun    721:        if (deliverifp != NULL) {
1.9       itojun    722:                struct in6_ifaddr *ia6;
                    723:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    724:                if (ia6)
                    725:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    726:        }
                    727: #endif
1.2       itojun    728:        ip6stat.ip6s_delivered++;
1.9       itojun    729:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    730:        nest = 0;
1.40      itojun    731:
1.2       itojun    732:        while (nxt != IPPROTO_DONE) {
                    733:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    734:                        ip6stat.ip6s_toomanyhdr++;
                    735:                        goto bad;
                    736:                }
1.8       itojun    737:
                    738:                /*
                    739:                 * protection against faulty packet - there should be
                    740:                 * more sanity checks in header chain processing.
                    741:                 */
                    742:                if (m->m_pkthdr.len < off) {
                    743:                        ip6stat.ip6s_tooshort++;
1.9       itojun    744:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    745:                        goto bad;
                    746:                }
                    747:
1.37      itojun    748: #ifdef IPSEC
                    749:                /*
                    750:                 * enforce IPsec policy checking if we are seeing last header.
                    751:                 * note that we do not visit this with protocols with pcb layer
                    752:                 * code - like udp/tcp/raw ip.
                    753:                 */
                    754:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    755:                    ipsec6_in_reject(m, NULL)) {
                    756:                        ipsec6stat.in_polvio++;
                    757:                        goto bad;
                    758:                }
                    759: #endif
1.56      itojun    760:
1.2       itojun    761:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    762:        }
                    763:        return;
                    764:  bad:
                    765:        m_freem(m);
                    766: }
                    767:
                    768: /*
1.81      rpaulo    769:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    770:  */
                    771: static struct m_tag *
                    772: ip6_setdstifaddr(m, ia6)
                    773:        struct mbuf *m;
                    774:        struct in6_ifaddr *ia6;
                    775: {
                    776:        struct m_tag *mtag;
                    777:
                    778:        mtag = ip6_addaux(m);
                    779:        if (mtag)
                    780:                ((struct ip6aux *)(mtag + 1))->ip6a_dstia6 = ia6;
                    781:        return mtag;    /* NULL if failed to set */
                    782: }
                    783:
                    784: struct in6_ifaddr *
                    785: ip6_getdstifaddr(m)
                    786:        struct mbuf *m;
                    787: {
                    788:        struct m_tag *mtag;
                    789:
                    790:        mtag = ip6_findaux(m);
                    791:        if (mtag)
                    792:                return ((struct ip6aux *)(mtag + 1))->ip6a_dstia6;
                    793:        else
                    794:                return NULL;
                    795: }
                    796:
                    797: /*
1.2       itojun    798:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    799:  * included, the real payload length will be stored in plenp.
                    800:  */
                    801: static int
                    802: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    803:        u_int32_t *plenp;
1.5       itojun    804:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    805:        struct mbuf **mp;
                    806:        int *offp;
                    807: {
1.35      itojun    808:        struct mbuf *m = *mp;
1.2       itojun    809:        int off = *offp, hbhlen;
                    810:        struct ip6_hbh *hbh;
                    811:
                    812:        /* validation of the length of the header */
1.9       itojun    813:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    814:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    815:        if (hbh == NULL) {
                    816:                ip6stat.ip6s_tooshort++;
                    817:                return -1;
                    818:        }
                    819:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    820:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    821:                hbhlen);
                    822:        if (hbh == NULL) {
                    823:                ip6stat.ip6s_tooshort++;
                    824:                return -1;
                    825:        }
1.57      thorpej   826:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    827:        off += hbhlen;
                    828:        hbhlen -= sizeof(struct ip6_hbh);
                    829:
                    830:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    831:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    832:                return (-1);
1.2       itojun    833:
                    834:        *offp = off;
                    835:        *mp = m;
1.58      itojun    836:        return (0);
1.2       itojun    837: }
                    838:
                    839: /*
                    840:  * Search header for all Hop-by-hop options and process each option.
                    841:  * This function is separate from ip6_hopopts_input() in order to
                    842:  * handle a case where the sending node itself process its hop-by-hop
                    843:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    844:  *
                    845:  * The function assumes that hbh header is located right after the IPv6 header
                    846:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    847:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    848:  */
                    849: int
                    850: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    851:        struct mbuf *m;
                    852:        u_int8_t *opthead;
                    853:        int hbhlen;
1.5       itojun    854:        u_int32_t *rtalertp;
1.2       itojun    855:        u_int32_t *plenp;
                    856: {
                    857:        struct ip6_hdr *ip6;
                    858:        int optlen = 0;
                    859:        u_int8_t *opt = opthead;
                    860:        u_int16_t rtalert_val;
1.22      itojun    861:        u_int32_t jumboplen;
1.55      itojun    862:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    863:
                    864:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    865:                switch (*opt) {
                    866:                case IP6OPT_PAD1:
                    867:                        optlen = 1;
                    868:                        break;
                    869:                case IP6OPT_PADN:
                    870:                        if (hbhlen < IP6OPT_MINLEN) {
                    871:                                ip6stat.ip6s_toosmall++;
                    872:                                goto bad;
                    873:                        }
                    874:                        optlen = *(opt + 1) + 2;
                    875:                        break;
                    876:                case IP6OPT_RTALERT:
                    877:                        /* XXX may need check for alignment */
                    878:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    879:                                ip6stat.ip6s_toosmall++;
                    880:                                goto bad;
                    881:                        }
                    882:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    883:                                /* XXX stat */
                    884:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    885:                                    ICMP6_PARAMPROB_HEADER,
                    886:                                    erroff + opt + 1 - opthead);
                    887:                                return (-1);
1.35      itojun    888:                        }
                    889:                        optlen = IP6OPT_RTALERT_LEN;
                    890:                        bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    891:                        *rtalertp = ntohs(rtalert_val);
                    892:                        break;
                    893:                case IP6OPT_JUMBO:
1.22      itojun    894:                        /* XXX may need check for alignment */
                    895:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    896:                                ip6stat.ip6s_toosmall++;
                    897:                                goto bad;
                    898:                        }
1.35      itojun    899:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    900:                                /* XXX stat */
                    901:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    902:                                    ICMP6_PARAMPROB_HEADER,
                    903:                                    erroff + opt + 1 - opthead);
                    904:                                return (-1);
1.35      itojun    905:                        }
1.22      itojun    906:                        optlen = IP6OPT_JUMBO_LEN;
                    907:
                    908:                        /*
                    909:                         * IPv6 packets that have non 0 payload length
1.35      itojun    910:                         * must not contain a jumbo payload option.
1.22      itojun    911:                         */
                    912:                        ip6 = mtod(m, struct ip6_hdr *);
                    913:                        if (ip6->ip6_plen) {
                    914:                                ip6stat.ip6s_badoptions++;
                    915:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    916:                                    ICMP6_PARAMPROB_HEADER,
                    917:                                    erroff + opt - opthead);
                    918:                                return (-1);
1.22      itojun    919:                        }
1.2       itojun    920:
1.22      itojun    921:                        /*
                    922:                         * We may see jumbolen in unaligned location, so
                    923:                         * we'd need to perform bcopy().
                    924:                         */
                    925:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    926:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    927:
                    928: #if 1
                    929:                        /*
                    930:                         * if there are multiple jumbo payload options,
                    931:                         * *plenp will be non-zero and the packet will be
                    932:                         * rejected.
                    933:                         * the behavior may need some debate in ipngwg -
                    934:                         * multiple options does not make sense, however,
                    935:                         * there's no explicit mention in specification.
                    936:                         */
                    937:                        if (*plenp != 0) {
                    938:                                ip6stat.ip6s_badoptions++;
                    939:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    940:                                    ICMP6_PARAMPROB_HEADER,
                    941:                                    erroff + opt + 2 - opthead);
                    942:                                return (-1);
1.22      itojun    943:                        }
1.8       itojun    944: #endif
1.2       itojun    945:
1.22      itojun    946:                        /*
                    947:                         * jumbo payload length must be larger than 65535.
                    948:                         */
                    949:                        if (jumboplen <= IPV6_MAXPACKET) {
                    950:                                ip6stat.ip6s_badoptions++;
                    951:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    952:                                    ICMP6_PARAMPROB_HEADER,
                    953:                                    erroff + opt + 2 - opthead);
                    954:                                return (-1);
1.22      itojun    955:                        }
                    956:                        *plenp = jumboplen;
                    957:
                    958:                        break;
1.35      itojun    959:                default:                /* unknown option */
                    960:                        if (hbhlen < IP6OPT_MINLEN) {
                    961:                                ip6stat.ip6s_toosmall++;
                    962:                                goto bad;
                    963:                        }
1.55      itojun    964:                        optlen = ip6_unknown_opt(opt, m,
                    965:                            erroff + opt - opthead);
                    966:                        if (optlen == -1)
                    967:                                return (-1);
1.35      itojun    968:                        optlen += 2;
                    969:                        break;
1.2       itojun    970:                }
                    971:        }
                    972:
1.55      itojun    973:        return (0);
1.2       itojun    974:
                    975:   bad:
                    976:        m_freem(m);
1.55      itojun    977:        return (-1);
1.2       itojun    978: }
                    979:
                    980: /*
                    981:  * Unknown option processing.
                    982:  * The third argument `off' is the offset from the IPv6 header to the option,
                    983:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    984:  * is not continuous in order to return an ICMPv6 error.
                    985:  */
                    986: int
                    987: ip6_unknown_opt(optp, m, off)
                    988:        u_int8_t *optp;
                    989:        struct mbuf *m;
                    990:        int off;
                    991: {
                    992:        struct ip6_hdr *ip6;
                    993:
1.35      itojun    994:        switch (IP6OPT_TYPE(*optp)) {
                    995:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun    996:                return ((int)*(optp + 1));
1.35      itojun    997:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                    998:                m_freem(m);
1.58      itojun    999:                return (-1);
1.35      itojun   1000:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                   1001:                ip6stat.ip6s_badoptions++;
                   1002:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1003:                return (-1);
1.35      itojun   1004:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                   1005:                ip6stat.ip6s_badoptions++;
                   1006:                ip6 = mtod(m, struct ip6_hdr *);
                   1007:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1008:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1009:                        m_freem(m);
                   1010:                else
                   1011:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1012:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1013:                return (-1);
1.2       itojun   1014:        }
                   1015:
                   1016:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1017:        return (-1);
1.2       itojun   1018: }
                   1019:
                   1020: /*
1.9       itojun   1021:  * Create the "control" list for this pcb.
                   1022:  *
                   1023:  * The routine will be called from upper layer handlers like tcp6_input().
                   1024:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1025:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1026:  * very first mbuf on the mbuf chain.
                   1027:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1028:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1029:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1030:  */
                   1031: void
                   1032: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun   1033:        struct in6pcb *in6p;
                   1034:        struct mbuf **mp;
                   1035:        struct ip6_hdr *ip6;
                   1036:        struct mbuf *m;
1.2       itojun   1037: {
1.85      rpaulo   1038: #ifdef RFC2292
                   1039: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1040: #else
                   1041: #define IS2292(x, y)   (y)
                   1042: #endif
                   1043:
1.9       itojun   1044: #ifdef SO_TIMESTAMP
1.2       itojun   1045:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1046:                struct timeval tv;
                   1047:
                   1048:                microtime(&tv);
                   1049:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1.63      itojun   1050:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1051:                if (*mp)
                   1052:                        mp = &(*mp)->m_next;
                   1053:        }
1.9       itojun   1054: #endif
1.86.2.1! chap     1055:
        !          1056:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
        !          1057:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
        !          1058:                return;
        !          1059:
1.2       itojun   1060:        /* RFC 2292 sec. 5 */
1.35      itojun   1061:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1062:                struct in6_pktinfo pi6;
1.85      rpaulo   1063:
1.2       itojun   1064:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1.81      rpaulo   1065:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1066:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1067:                    m->m_pkthdr.rcvif->if_index : 0;
1.2       itojun   1068:                *mp = sbcreatecontrol((caddr_t) &pi6,
1.85      rpaulo   1069:                    sizeof(struct in6_pktinfo),
                   1070:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1071:                if (*mp)
                   1072:                        mp = &(*mp)->m_next;
                   1073:        }
1.85      rpaulo   1074:
1.2       itojun   1075:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1076:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1077:
1.63      itojun   1078:                *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1.85      rpaulo   1079:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1080:                if (*mp)
                   1081:                        mp = &(*mp)->m_next;
                   1082:        }
                   1083:
                   1084:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1085:                u_int32_t flowinfo;
                   1086:                int tclass;
                   1087:
                   1088:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1089:                flowinfo >>= 20;
                   1090:
                   1091:                tclass = flowinfo & 0xff;
                   1092:                *mp = sbcreatecontrol((caddr_t)&tclass, sizeof(tclass),
                   1093:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1094:
1.2       itojun   1095:                if (*mp)
                   1096:                        mp = &(*mp)->m_next;
                   1097:        }
                   1098:
                   1099:        /*
1.75      itojun   1100:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1101:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1102:         * strict, since there might be some hop-by-hop options which can be
                   1103:         * returned to normal user.
1.85      rpaulo   1104:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1105:         */
1.75      itojun   1106:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1107:                /*
                   1108:                 * Check if a hop-by-hop options header is contatined in the
                   1109:                 * received packet, and if so, store the options as ancillary
                   1110:                 * data. Note that a hop-by-hop options header must be
                   1111:                 * just after the IPv6 header, which fact is assured through
                   1112:                 * the IPv6 input processing.
                   1113:                 */
1.78      christos 1114:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1115:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1116:                        struct ip6_hbh *hbh;
                   1117:                        int hbhlen;
1.62      itojun   1118:                        struct mbuf *ext;
1.9       itojun   1119:
1.62      itojun   1120:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1121:                            xip6->ip6_nxt);
1.62      itojun   1122:                        if (ext == NULL) {
1.9       itojun   1123:                                ip6stat.ip6s_tooshort++;
                   1124:                                return;
                   1125:                        }
1.62      itojun   1126:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1127:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1128:                        if (hbhlen != ext->m_len) {
                   1129:                                m_freem(ext);
1.9       itojun   1130:                                ip6stat.ip6s_tooshort++;
                   1131:                                return;
                   1132:                        }
1.2       itojun   1133:
                   1134:                        /*
                   1135:                         * XXX: We copy whole the header even if a jumbo
                   1136:                         * payload option is included, which option is to
                   1137:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1138:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1139:                         */
1.9       itojun   1140:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.85      rpaulo   1141:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1142:                            IPPROTO_IPV6);
1.2       itojun   1143:                        if (*mp)
                   1144:                                mp = &(*mp)->m_next;
1.62      itojun   1145:                        m_freem(ext);
1.2       itojun   1146:                }
                   1147:        }
                   1148:
                   1149:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1150:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1151:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1152:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1153:
                   1154:                /*
                   1155:                 * Search for destination options headers or routing
                   1156:                 * header(s) through the header chain, and stores each
                   1157:                 * header as ancillary data.
                   1158:                 * Note that the order of the headers remains in
                   1159:                 * the chain of ancillary data.
                   1160:                 */
1.86      rpaulo   1161:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1162:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1163:                        int elen;
1.62      itojun   1164:                        struct mbuf *ext = NULL;
1.9       itojun   1165:
1.62      itojun   1166:                        /*
                   1167:                         * if it is not an extension header, don't try to
                   1168:                         * pull it from the chain.
                   1169:                         */
                   1170:                        switch (nxt) {
                   1171:                        case IPPROTO_DSTOPTS:
                   1172:                        case IPPROTO_ROUTING:
                   1173:                        case IPPROTO_HOPOPTS:
                   1174:                        case IPPROTO_AH: /* is it possible? */
                   1175:                                break;
                   1176:                        default:
                   1177:                                goto loopend;
                   1178:                        }
                   1179:
                   1180:                        ext = ip6_pullexthdr(m, off, nxt);
                   1181:                        if (ext == NULL) {
1.9       itojun   1182:                                ip6stat.ip6s_tooshort++;
                   1183:                                return;
                   1184:                        }
1.62      itojun   1185:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1186:                        if (nxt == IPPROTO_AH)
                   1187:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1188:                        else
                   1189:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1190:                        if (elen != ext->m_len) {
                   1191:                                m_freem(ext);
1.9       itojun   1192:                                ip6stat.ip6s_tooshort++;
                   1193:                                return;
                   1194:                        }
1.57      thorpej  1195:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1196:
1.35      itojun   1197:                        switch (nxt) {
1.62      itojun   1198:                        case IPPROTO_DSTOPTS:
1.35      itojun   1199:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1200:                                        break;
                   1201:
                   1202:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.85      rpaulo   1203:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1204:                                    IPPROTO_IPV6);
1.35      itojun   1205:                                if (*mp)
                   1206:                                        mp = &(*mp)->m_next;
                   1207:                                break;
                   1208:
                   1209:                        case IPPROTO_ROUTING:
                   1210:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1211:                                        break;
                   1212:
                   1213:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.85      rpaulo   1214:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1215:                                    IPPROTO_IPV6);
1.35      itojun   1216:                                if (*mp)
                   1217:                                        mp = &(*mp)->m_next;
                   1218:                                break;
                   1219:
1.62      itojun   1220:                        case IPPROTO_HOPOPTS:
                   1221:                        case IPPROTO_AH: /* is it possible? */
                   1222:                                break;
                   1223:
1.35      itojun   1224:                        default:
                   1225:                                /*
1.62      itojun   1226:                                 * other cases have been filtered in the above.
                   1227:                                 * none will visit this case.  here we supply
                   1228:                                 * the code just in case (nxt overwritten or
                   1229:                                 * other cases).
1.35      itojun   1230:                                 */
1.62      itojun   1231:                                m_freem(ext);
1.35      itojun   1232:                                goto loopend;
                   1233:
1.2       itojun   1234:                        }
                   1235:
                   1236:                        /* proceed with the next header. */
1.9       itojun   1237:                        off += elen;
1.2       itojun   1238:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1239:                        ip6e = NULL;
                   1240:                        m_freem(ext);
                   1241:                        ext = NULL;
1.2       itojun   1242:                }
                   1243:          loopend:
1.62      itojun   1244:                ;
1.2       itojun   1245:        }
1.62      itojun   1246: }
1.85      rpaulo   1247: #undef IS2292
                   1248:
                   1249:
                   1250: void
                   1251: ip6_notify_pmtu(struct in6pcb *in6p, struct sockaddr_in6 *dst, uint32_t *mtu)
                   1252: {
                   1253:        struct socket *so;
                   1254:        struct mbuf *m_mtu;
                   1255:        struct ip6_mtuinfo mtuctl;
                   1256:
                   1257:        so = in6p->in6p_socket;
                   1258:
                   1259:        if (mtu == NULL)
                   1260:                return;
                   1261:
                   1262: #ifdef DIAGNOSTIC
                   1263:        if (so == NULL)         /* I believe this is impossible */
                   1264:                panic("ip6_notify_pmtu: socket is NULL");
                   1265: #endif
                   1266:
                   1267:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1268:        mtuctl.ip6m_mtu = *mtu;
                   1269:        mtuctl.ip6m_addr = *dst;
                   1270:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1271:                return;
                   1272:
                   1273:        if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
                   1274:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1275:                return;
                   1276:
                   1277:        if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
                   1278:            == 0) {
                   1279:                m_freem(m_mtu);
                   1280:                /* XXX: should count statistics */
                   1281:        } else
                   1282:                sorwakeup(so);
                   1283:
                   1284:        return;
                   1285: }
1.62      itojun   1286:
                   1287: /*
                   1288:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1289:  * contains the result, or NULL on error.
                   1290:  */
                   1291: static struct mbuf *
                   1292: ip6_pullexthdr(m, off, nxt)
                   1293:        struct mbuf *m;
                   1294:        size_t off;
                   1295:        int nxt;
                   1296: {
                   1297:        struct ip6_ext ip6e;
                   1298:        size_t elen;
                   1299:        struct mbuf *n;
                   1300:
                   1301: #ifdef DIAGNOSTIC
                   1302:        switch (nxt) {
                   1303:        case IPPROTO_DSTOPTS:
                   1304:        case IPPROTO_ROUTING:
                   1305:        case IPPROTO_HOPOPTS:
                   1306:        case IPPROTO_AH: /* is it possible? */
                   1307:                break;
                   1308:        default:
                   1309:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1310:        }
1.62      itojun   1311: #endif
1.2       itojun   1312:
1.62      itojun   1313:        m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1314:        if (nxt == IPPROTO_AH)
                   1315:                elen = (ip6e.ip6e_len + 2) << 2;
                   1316:        else
                   1317:                elen = (ip6e.ip6e_len + 1) << 3;
                   1318:
                   1319:        MGET(n, M_DONTWAIT, MT_DATA);
                   1320:        if (n && elen >= MLEN) {
                   1321:                MCLGET(n, M_DONTWAIT);
                   1322:                if ((n->m_flags & M_EXT) == 0) {
                   1323:                        m_free(n);
                   1324:                        n = NULL;
                   1325:                }
                   1326:        }
                   1327:        if (!n)
                   1328:                return NULL;
                   1329:
                   1330:        n->m_len = 0;
                   1331:        if (elen >= M_TRAILINGSPACE(n)) {
                   1332:                m_free(n);
                   1333:                return NULL;
                   1334:        }
                   1335:
                   1336:        m_copydata(m, off, elen, mtod(n, caddr_t));
                   1337:        n->m_len = elen;
                   1338:        return n;
1.2       itojun   1339: }
                   1340:
                   1341: /*
                   1342:  * Get pointer to the previous header followed by the header
                   1343:  * currently processed.
                   1344:  * XXX: This function supposes that
                   1345:  *     M includes all headers,
                   1346:  *     the next header field and the header length field of each header
                   1347:  *     are valid, and
                   1348:  *     the sum of each header length equals to OFF.
                   1349:  * Because of these assumptions, this function must be called very
                   1350:  * carefully. Moreover, it will not be used in the near future when
                   1351:  * we develop `neater' mechanism to process extension headers.
                   1352:  */
1.58      itojun   1353: u_int8_t *
1.2       itojun   1354: ip6_get_prevhdr(m, off)
                   1355:        struct mbuf *m;
                   1356:        int off;
                   1357: {
                   1358:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1359:
                   1360:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1361:                return (&ip6->ip6_nxt);
1.2       itojun   1362:        else {
                   1363:                int len, nxt;
                   1364:                struct ip6_ext *ip6e = NULL;
                   1365:
                   1366:                nxt = ip6->ip6_nxt;
                   1367:                len = sizeof(struct ip6_hdr);
                   1368:                while (len < off) {
                   1369:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1370:
1.35      itojun   1371:                        switch (nxt) {
1.2       itojun   1372:                        case IPPROTO_FRAGMENT:
                   1373:                                len += sizeof(struct ip6_frag);
                   1374:                                break;
                   1375:                        case IPPROTO_AH:
                   1376:                                len += (ip6e->ip6e_len + 2) << 2;
                   1377:                                break;
                   1378:                        default:
                   1379:                                len += (ip6e->ip6e_len + 1) << 3;
                   1380:                                break;
                   1381:                        }
                   1382:                        nxt = ip6e->ip6e_nxt;
                   1383:                }
                   1384:                if (ip6e)
1.58      itojun   1385:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1386:                else
                   1387:                        return NULL;
1.18      itojun   1388:        }
                   1389: }
                   1390:
                   1391: /*
                   1392:  * get next header offset.  m will be retained.
                   1393:  */
                   1394: int
                   1395: ip6_nexthdr(m, off, proto, nxtp)
                   1396:        struct mbuf *m;
                   1397:        int off;
                   1398:        int proto;
                   1399:        int *nxtp;
                   1400: {
                   1401:        struct ip6_hdr ip6;
                   1402:        struct ip6_ext ip6e;
                   1403:        struct ip6_frag fh;
                   1404:
                   1405:        /* just in case */
                   1406:        if (m == NULL)
                   1407:                panic("ip6_nexthdr: m == NULL");
                   1408:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1409:                return -1;
                   1410:
                   1411:        switch (proto) {
                   1412:        case IPPROTO_IPV6:
1.83      rpaulo   1413:                /* do not chase beyond intermediate IPv6 headers */
                   1414:                if (off != 0)
                   1415:                        return -1;
1.18      itojun   1416:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1417:                        return -1;
                   1418:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1419:                if (nxtp)
                   1420:                        *nxtp = ip6.ip6_nxt;
                   1421:                off += sizeof(ip6);
                   1422:                return off;
                   1423:
                   1424:        case IPPROTO_FRAGMENT:
                   1425:                /*
                   1426:                 * terminate parsing if it is not the first fragment,
                   1427:                 * it does not make sense to parse through it.
                   1428:                 */
                   1429:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1430:                        return -1;
                   1431:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1.67      itojun   1432:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1433:                        return -1;
                   1434:                if (nxtp)
                   1435:                        *nxtp = fh.ip6f_nxt;
                   1436:                off += sizeof(struct ip6_frag);
                   1437:                return off;
                   1438:
                   1439:        case IPPROTO_AH:
                   1440:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1441:                        return -1;
                   1442:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1443:                if (nxtp)
                   1444:                        *nxtp = ip6e.ip6e_nxt;
                   1445:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1446:                if (m->m_pkthdr.len < off)
                   1447:                        return -1;
1.18      itojun   1448:                return off;
                   1449:
                   1450:        case IPPROTO_HOPOPTS:
                   1451:        case IPPROTO_ROUTING:
                   1452:        case IPPROTO_DSTOPTS:
                   1453:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1454:                        return -1;
                   1455:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1456:                if (nxtp)
                   1457:                        *nxtp = ip6e.ip6e_nxt;
                   1458:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1459:                if (m->m_pkthdr.len < off)
                   1460:                        return -1;
1.18      itojun   1461:                return off;
                   1462:
                   1463:        case IPPROTO_NONE:
                   1464:        case IPPROTO_ESP:
                   1465:        case IPPROTO_IPCOMP:
                   1466:                /* give up */
                   1467:                return -1;
                   1468:
                   1469:        default:
                   1470:                return -1;
                   1471:        }
                   1472: }
                   1473:
                   1474: /*
                   1475:  * get offset for the last header in the chain.  m will be kept untainted.
                   1476:  */
                   1477: int
                   1478: ip6_lasthdr(m, off, proto, nxtp)
                   1479:        struct mbuf *m;
                   1480:        int off;
                   1481:        int proto;
                   1482:        int *nxtp;
                   1483: {
                   1484:        int newoff;
                   1485:        int nxt;
                   1486:
                   1487:        if (!nxtp) {
                   1488:                nxt = -1;
                   1489:                nxtp = &nxt;
                   1490:        }
1.86      rpaulo   1491:        for (;;) {
1.18      itojun   1492:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1493:                if (newoff < 0)
                   1494:                        return off;
                   1495:                else if (newoff < off)
                   1496:                        return -1;      /* invalid */
                   1497:                else if (newoff == off)
                   1498:                        return newoff;
                   1499:
                   1500:                off = newoff;
                   1501:                proto = *nxtp;
1.2       itojun   1502:        }
                   1503: }
                   1504:
1.81      rpaulo   1505: struct m_tag *
                   1506: ip6_addaux(m)
                   1507:        struct mbuf *m;
                   1508: {
                   1509:        struct m_tag *mtag;
                   1510:
                   1511:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1512:        if (!mtag) {
                   1513:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1514:                    M_NOWAIT);
                   1515:                if (mtag) {
                   1516:                        m_tag_prepend(m, mtag);
                   1517:                        bzero(mtag + 1, sizeof(struct ip6aux));
                   1518:                }
                   1519:        }
                   1520:        return mtag;
                   1521: }
                   1522:
                   1523: struct m_tag *
                   1524: ip6_findaux(m)
                   1525:        struct mbuf *m;
                   1526: {
                   1527:        struct m_tag *mtag;
                   1528:
                   1529:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1530:        return mtag;
                   1531: }
                   1532:
                   1533: void
                   1534: ip6_delaux(m)
                   1535:        struct mbuf *m;
                   1536: {
                   1537:        struct m_tag *mtag;
                   1538:
                   1539:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1540:        if (mtag)
                   1541:                m_tag_delete(m, mtag);
                   1542: }
                   1543:
1.2       itojun   1544: /*
                   1545:  * System control for IP6
                   1546:  */
                   1547:
                   1548: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1549:        0,              0,              0,              0,
                   1550:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1551:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1552:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1553:        0,              0,              0,              0,
                   1554:        ENOPROTOOPT
                   1555: };
                   1556:
1.70      atatat   1557: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2       itojun   1558: {
1.85      rpaulo   1559: #ifdef RFC2292
                   1560: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1561: #else
                   1562: #define IS2292(x, y)   (y)
                   1563: #endif
1.26      itojun   1564:
1.73      atatat   1565:        sysctl_createv(clog, 0, NULL, NULL,
                   1566:                       CTLFLAG_PERMANENT,
1.70      atatat   1567:                       CTLTYPE_NODE, "net", NULL,
                   1568:                       NULL, 0, NULL, 0,
                   1569:                       CTL_NET, CTL_EOL);
1.73      atatat   1570:        sysctl_createv(clog, 0, NULL, NULL,
                   1571:                       CTLFLAG_PERMANENT,
1.74      atatat   1572:                       CTLTYPE_NODE, "inet6",
                   1573:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1574:                       NULL, 0, NULL, 0,
                   1575:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1576:        sysctl_createv(clog, 0, NULL, NULL,
                   1577:                       CTLFLAG_PERMANENT,
1.74      atatat   1578:                       CTLTYPE_NODE, "ip6",
                   1579:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1580:                       NULL, 0, NULL, 0,
                   1581:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1582:
1.73      atatat   1583:        sysctl_createv(clog, 0, NULL, NULL,
                   1584:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1585:                       CTLTYPE_INT, "forwarding",
                   1586:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1587:                       NULL, 0, &ip6_forwarding, 0,
                   1588:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1589:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1590:        sysctl_createv(clog, 0, NULL, NULL,
                   1591:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1592:                       CTLTYPE_INT, "redirect",
                   1593:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1594:                       NULL, 0, &ip6_sendredirects, 0,
                   1595:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1596:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1597:        sysctl_createv(clog, 0, NULL, NULL,
                   1598:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1599:                       CTLTYPE_INT, "hlim",
                   1600:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1601:                       NULL, 0, &ip6_defhlim, 0,
                   1602:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1603:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1604: #ifdef notyet
1.73      atatat   1605:        sysctl_createv(clog, 0, NULL, NULL,
                   1606:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1607:                       CTLTYPE_INT, "mtu", NULL,
                   1608:                       NULL, 0, &, 0,
                   1609:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1610:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1611: #endif
                   1612: #ifdef __no_idea__
1.73      atatat   1613:        sysctl_createv(clog, 0, NULL, NULL,
                   1614:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1615:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1616:                       NULL, 0, &?, 0,
                   1617:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1618:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1619:        sysctl_createv(clog, 0, NULL, NULL,
                   1620:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1621:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1622:                       NULL, 0, &?, sizeof(?),
                   1623:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1624:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1625:        sysctl_createv(clog, 0, NULL, NULL,
                   1626:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1627:                       CTLTYPE_?, "mrtproto", NULL,
                   1628:                       NULL, 0, &?, sizeof(?),
                   1629:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1630:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1631: #endif
1.73      atatat   1632:        sysctl_createv(clog, 0, NULL, NULL,
                   1633:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1634:                       CTLTYPE_INT, "maxfragpackets",
                   1635:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1636:                                    "for reassembly"),
1.70      atatat   1637:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1638:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1639:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1640: #ifdef __no_idea__
1.73      atatat   1641:        sysctl_createv(clog, 0, NULL, NULL,
                   1642:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1643:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1644:                       NULL, 0, &?, 0,
                   1645:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1646:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1647:        sysctl_createv(clog, 0, NULL, NULL,
                   1648:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1649:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1650:                       NULL, 0, &?, 0,
                   1651:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1652:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1653: #endif
1.73      atatat   1654:        sysctl_createv(clog, 0, NULL, NULL,
                   1655:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1656:                       CTLTYPE_INT, "accept_rtadv",
                   1657:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1658:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1659:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1660:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1661:        sysctl_createv(clog, 0, NULL, NULL,
                   1662:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1663:                       CTLTYPE_INT, "keepfaith",
                   1664:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1665:                       NULL, 0, &ip6_keepfaith, 0,
                   1666:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1667:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1668:        sysctl_createv(clog, 0, NULL, NULL,
                   1669:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1670:                       CTLTYPE_INT, "log_interval",
                   1671:                       SYSCTL_DESCR("Minumum interval between logging "
                   1672:                                    "unroutable packets"),
1.70      atatat   1673:                       NULL, 0, &ip6_log_interval, 0,
                   1674:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1675:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1676:        sysctl_createv(clog, 0, NULL, NULL,
                   1677:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1678:                       CTLTYPE_INT, "hdrnestlimit",
                   1679:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1680:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1681:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1682:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1683:        sysctl_createv(clog, 0, NULL, NULL,
                   1684:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1685:                       CTLTYPE_INT, "dad_count",
                   1686:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1687:                                    "probes to send"),
1.70      atatat   1688:                       NULL, 0, &ip6_dad_count, 0,
                   1689:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1690:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1691:        sysctl_createv(clog, 0, NULL, NULL,
                   1692:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1693:                       CTLTYPE_INT, "auto_flowlabel",
                   1694:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1695:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1696:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1697:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1698:        sysctl_createv(clog, 0, NULL, NULL,
                   1699:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1700:                       CTLTYPE_INT, "defmcasthlim",
                   1701:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1702:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1703:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1704:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1705: #if NGIF > 0
1.73      atatat   1706:        sysctl_createv(clog, 0, NULL, NULL,
                   1707:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1708:                       CTLTYPE_INT, "gifhlim",
                   1709:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1710:                       NULL, 0, &ip6_gif_hlim, 0,
                   1711:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1712:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1713: #endif /* NGIF */
1.73      atatat   1714:        sysctl_createv(clog, 0, NULL, NULL,
                   1715:                       CTLFLAG_PERMANENT,
1.74      atatat   1716:                       CTLTYPE_STRING, "kame_version",
                   1717:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1718:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1719:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1720:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1721:        sysctl_createv(clog, 0, NULL, NULL,
                   1722:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1723:                       CTLTYPE_INT, "use_deprecated",
                   1724:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1725:                                    "source addresses"),
1.70      atatat   1726:                       NULL, 0, &ip6_use_deprecated, 0,
                   1727:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1728:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1729:        sysctl_createv(clog, 0, NULL, NULL,
                   1730:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1731:                       CTLTYPE_INT, "rr_prune", NULL,
                   1732:                       NULL, 0, &ip6_rr_prune, 0,
                   1733:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1734:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1735:        sysctl_createv(clog, 0, NULL, NULL,
                   1736:                       CTLFLAG_PERMANENT
1.70      atatat   1737: #ifndef INET6_BINDV6ONLY
1.73      atatat   1738:                       |CTLFLAG_READWRITE,
1.70      atatat   1739: #endif
1.74      atatat   1740:                       CTLTYPE_INT, "v6only",
                   1741:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1742:                                    "to PF_INET sockets"),
1.70      atatat   1743:                       NULL, 0, &ip6_v6only, 0,
                   1744:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1745:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1746:        sysctl_createv(clog, 0, NULL, NULL,
                   1747:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1748:                       CTLTYPE_INT, "anonportmin",
                   1749:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1750:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1751:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1752:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1753:        sysctl_createv(clog, 0, NULL, NULL,
                   1754:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1755:                       CTLTYPE_INT, "anonportmax",
                   1756:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1757:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1758:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1759:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1760: #ifndef IPNOPRIVPORTS
1.73      atatat   1761:        sysctl_createv(clog, 0, NULL, NULL,
                   1762:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1763:                       CTLTYPE_INT, "lowportmin",
                   1764:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1765:                                    "to assign"),
1.70      atatat   1766:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1767:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1768:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1769:        sysctl_createv(clog, 0, NULL, NULL,
                   1770:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1771:                       CTLTYPE_INT, "lowportmax",
                   1772:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1773:                                    "to assign"),
1.70      atatat   1774:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1775:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1776:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1777: #endif /* IPNOPRIVPORTS */
1.73      atatat   1778:        sysctl_createv(clog, 0, NULL, NULL,
                   1779:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1780:                       CTLTYPE_INT, "use_tempaddr",
                   1781:                       SYSCTL_DESCR("Use temporary address"),
                   1782:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1783:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1784:                       CTL_CREATE, CTL_EOL);
                   1785:        sysctl_createv(clog, 0, NULL, NULL,
                   1786:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1787:                       CTLTYPE_INT, "temppltime",
                   1788:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1789:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1790:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1791:                       CTL_CREATE, CTL_EOL);
                   1792:        sysctl_createv(clog, 0, NULL, NULL,
                   1793:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1794:                       CTLTYPE_INT, "tempvltime",
                   1795:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1796:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1797:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1798:                       CTL_CREATE, CTL_EOL);
                   1799:        sysctl_createv(clog, 0, NULL, NULL,
                   1800:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1801:                       CTLTYPE_INT, "maxfrags",
                   1802:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1803:                       NULL, 0, &ip6_maxfrags, 0,
                   1804:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1805:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1806:        sysctl_createv(clog, 0, NULL, NULL,
                   1807:                       CTLFLAG_PERMANENT,
                   1808:                       CTLTYPE_STRUCT, "stats",
                   1809:                       SYSCTL_DESCR("IPv6 statistics"),
                   1810:                       NULL, 0, &ip6stat, sizeof(ip6stat),
                   1811:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1812:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1813:        sysctl_createv(clog, 0, NULL, NULL,
                   1814:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1815:                       CTLTYPE_INT, "use_defaultzone",
                   1816:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1817:                       NULL, 0, &ip6_use_defzone, 0,
                   1818:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1819:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1820:        sysctl_createv(clog, 0, NULL, NULL,
                   1821:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1822:                       CTLTYPE_INT, "mcast_pmtu",
                   1823:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1824:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1825:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1826:                       CTL_CREATE, CTL_EOL);
1.2       itojun   1827: }

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