[BACK]Return to ip6_input.c CVS log [TXT][DIR] Up to [cvs.NetBSD.org] / src / sys / netinet6

Annotation of src/sys/netinet6/ip6_input.c, Revision 1.41.2.2

1.41.2.2! thorpej     1: /*     $NetBSD: ip6_input.c,v 1.41.2.1 2001/08/25 06:17:05 thorpej Exp $       */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
                     45:  * 3. All advertising materials mentioning features or use of this software
                     46:  *    must display the following acknowledgement:
                     47:  *     This product includes software developed by the University of
                     48:  *     California, Berkeley and its contributors.
                     49:  * 4. Neither the name of the University nor the names of its contributors
                     50:  *    may be used to endorse or promote products derived from this software
                     51:  *    without specific prior written permission.
                     52:  *
                     53:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     54:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     55:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     56:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     57:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     58:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     59:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     60:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     61:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     62:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     63:  * SUCH DAMAGE.
                     64:  *
                     65:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     66:  */
                     67:
1.41.2.2! thorpej    68: #include <sys/cdefs.h>
        !            69: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.51 2001/12/22 01:40:03 itojun Exp $");
        !            70:
1.2       itojun     71: #include "opt_inet.h"
1.4       thorpej    72: #include "opt_ipsec.h"
1.15      darrenr    73: #include "opt_pfil_hooks.h"
1.2       itojun     74:
                     75: #include <sys/param.h>
                     76: #include <sys/systm.h>
                     77: #include <sys/malloc.h>
                     78: #include <sys/mbuf.h>
                     79: #include <sys/domain.h>
                     80: #include <sys/protosw.h>
                     81: #include <sys/socket.h>
                     82: #include <sys/socketvar.h>
                     83: #include <sys/errno.h>
                     84: #include <sys/time.h>
                     85: #include <sys/kernel.h>
                     86: #include <sys/syslog.h>
                     87: #include <sys/proc.h>
1.41.2.2! thorpej    88: #include <sys/sysctl.h>
1.2       itojun     89:
                     90: #include <net/if.h>
                     91: #include <net/if_types.h>
                     92: #include <net/if_dl.h>
                     93: #include <net/route.h>
                     94: #include <net/netisr.h>
1.15      darrenr    95: #ifdef PFIL_HOOKS
                     96: #include <net/pfil.h>
                     97: #endif
1.2       itojun     98:
                     99: #include <netinet/in.h>
1.9       itojun    100: #include <netinet/in_systm.h>
                    101: #ifdef INET
                    102: #include <netinet/ip.h>
                    103: #include <netinet/ip_icmp.h>
1.41.2.2! thorpej   104: #endif /* INET */
1.14      itojun    105: #include <netinet/ip6.h>
1.2       itojun    106: #include <netinet6/in6_var.h>
1.11      itojun    107: #include <netinet6/ip6_var.h>
1.2       itojun    108: #include <netinet6/in6_pcb.h>
1.14      itojun    109: #include <netinet/icmp6.h>
1.2       itojun    110: #include <netinet6/in6_ifattach.h>
                    111: #include <netinet6/nd6.h>
1.9       itojun    112: #include <netinet6/in6_prefix.h>
1.2       itojun    113:
1.37      itojun    114: #ifdef IPSEC
                    115: #include <netinet6/ipsec.h>
                    116: #endif
                    117:
1.2       itojun    118: #include <netinet6/ip6protosw.h>
                    119:
                    120: /* we need it for NLOOP. */
                    121: #include "loop.h"
                    122: #include "faith.h"
                    123: #include "gif.h"
                    124: #include "bpfilter.h"
                    125:
1.41.2.2! thorpej   126: #if NGIF > 0
        !           127: #include <netinet6/in6_gif.h>
        !           128: #endif
        !           129:
1.9       itojun    130: #include <net/net_osdep.h>
                    131:
1.2       itojun    132: extern struct domain inet6domain;
                    133:
                    134: u_char ip6_protox[IPPROTO_MAX];
                    135: static int ip6qmaxlen = IFQ_MAXLEN;
                    136: struct in6_ifaddr *in6_ifaddr;
                    137: struct ifqueue ip6intrq;
                    138:
                    139: extern struct ifnet loif[NLOOP];
                    140: int ip6_forward_srcrt;                 /* XXX */
                    141: int ip6_sourcecheck;                   /* XXX */
                    142: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    143:
1.29      thorpej   144: #ifdef PFIL_HOOKS
                    145: struct pfil_head inet6_pfil_hook;
                    146: #endif
                    147:
1.2       itojun    148: struct ip6stat ip6stat;
                    149:
                    150: static void ip6_init2 __P((void *));
                    151:
1.5       itojun    152: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2       itojun    153:
                    154: /*
                    155:  * IP6 initialization: fill in IP6 protocol switch table.
                    156:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    157:  */
                    158: void
                    159: ip6_init()
                    160: {
1.35      itojun    161:        struct ip6protosw *pr;
                    162:        int i;
1.2       itojun    163:        struct timeval tv;
                    164:
                    165:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    166:        if (pr == 0)
                    167:                panic("ip6_init");
                    168:        for (i = 0; i < IPPROTO_MAX; i++)
                    169:                ip6_protox[i] = pr - inet6sw;
                    170:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    171:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    172:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    173:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    174:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    175:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    176:        nd6_init();
                    177:        frag6_init();
                    178:        /*
                    179:         * in many cases, random() here does NOT return random number
                    180:         * as initialization during bootstrap time occur in fixed order.
                    181:         */
                    182:        microtime(&tv);
                    183:        ip6_flow_seq = random() ^ tv.tv_usec;
                    184:
                    185:        ip6_init2((void *)0);
1.29      thorpej   186:
                    187: #ifdef PFIL_HOOKS
                    188:        /* Register our Packet Filter hook. */
1.33      thorpej   189:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    190:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   191:        i = pfil_head_register(&inet6_pfil_hook);
                    192:        if (i != 0)
                    193:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    194:                    "error %d\n", i);
                    195: #endif /* PFIL_HOOKS */
1.2       itojun    196: }
                    197:
                    198: static void
                    199: ip6_init2(dummy)
                    200:        void *dummy;
                    201: {
                    202:        /*
                    203:         * to route local address of p2p link to loopback,
1.21      itojun    204:         * assign loopback address first.
1.2       itojun    205:         */
1.20      itojun    206:        in6_ifattach(&loif[0], NULL);
1.2       itojun    207:
                    208:        /* nd6_timer_init */
1.19      thorpej   209:        callout_init(&nd6_timer_ch);
                    210:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9       itojun    211:        /* router renumbering prefix list maintenance */
1.19      thorpej   212:        callout_init(&in6_rr_timer_ch);
                    213:        callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2       itojun    214: }
                    215:
                    216: /*
                    217:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    218:  */
                    219: void
                    220: ip6intr()
                    221: {
                    222:        int s;
                    223:        struct mbuf *m;
                    224:
                    225:        for (;;) {
1.41      thorpej   226:                s = splnet();
1.2       itojun    227:                IF_DEQUEUE(&ip6intrq, m);
                    228:                splx(s);
                    229:                if (m == 0)
                    230:                        return;
                    231:                ip6_input(m);
                    232:        }
                    233: }
                    234:
                    235: extern struct  route_in6 ip6_forward_rt;
                    236:
                    237: void
                    238: ip6_input(m)
                    239:        struct mbuf *m;
                    240: {
1.9       itojun    241:        struct ip6_hdr *ip6;
1.2       itojun    242:        int off = sizeof(struct ip6_hdr), nest;
                    243:        u_int32_t plen;
1.5       itojun    244:        u_int32_t rtalert = ~0;
1.2       itojun    245:        int nxt, ours = 0;
1.9       itojun    246:        struct ifnet *deliverifp = NULL;
1.2       itojun    247:
                    248: #ifdef IPSEC
                    249:        /*
                    250:         * should the inner packet be considered authentic?
                    251:         * see comment in ah4_input().
                    252:         */
1.41.2.2! thorpej   253:        m->m_flags &= ~M_AUTHIPHDR;
        !           254:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    255: #endif
1.9       itojun    256:
1.2       itojun    257:        /*
1.41.2.2! thorpej   258:         * mbuf statistics
1.2       itojun    259:         */
                    260:        if (m->m_flags & M_EXT) {
                    261:                if (m->m_next)
                    262:                        ip6stat.ip6s_mext2m++;
                    263:                else
                    264:                        ip6stat.ip6s_mext1++;
                    265:        } else {
1.40      itojun    266: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2       itojun    267:                if (m->m_next) {
1.9       itojun    268:                        if (m->m_flags & M_LOOP) {
1.41.2.2! thorpej   269:                                ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40      itojun    270:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    271:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    272:                        else
                    273:                                ip6stat.ip6s_m2m[0]++;
                    274:                } else
                    275:                        ip6stat.ip6s_m1++;
1.40      itojun    276: #undef M2MMAX
1.2       itojun    277:        }
                    278:
1.9       itojun    279:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    280:        ip6stat.ip6s_total++;
                    281:
                    282: #ifndef PULLDOWN_TEST
                    283:        /* XXX is the line really necessary? */
1.2       itojun    284:        IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9       itojun    285: #endif
1.2       itojun    286:
1.9       itojun    287:        if (m->m_len < sizeof(struct ip6_hdr)) {
                    288:                struct ifnet *inifp;
                    289:                inifp = m->m_pkthdr.rcvif;
                    290:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
                    291:                        ip6stat.ip6s_toosmall++;
                    292:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    293:                        return;
                    294:                }
1.2       itojun    295:        }
                    296:
                    297:        ip6 = mtod(m, struct ip6_hdr *);
                    298:
                    299:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    300:                ip6stat.ip6s_badvers++;
1.9       itojun    301:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    302:                goto bad;
                    303:        }
1.15      darrenr   304:
                    305: #ifdef PFIL_HOOKS
                    306:        /*
                    307:         * Run through list of hooks for input packets.  If there are any
                    308:         * filters which require that additional packets in the flow are
                    309:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    310:         * Note that filters must _never_ set this flag, as another filter
                    311:         * in the list may have previously cleared it.
                    312:         */
1.39      itojun    313:        /*
                    314:         * let ipfilter look at packet on the wire,
                    315:         * not the decapsulated packet.
                    316:         */
                    317: #ifdef IPSEC
1.41.2.1  thorpej   318:        if (!ipsec_getnhist(m))
1.39      itojun    319: #else
                    320:        if (1)
                    321: #endif
                    322:        {
                    323:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    324:                                   PFIL_IN) != 0)
                    325:                        return;
                    326:                if (m == NULL)
                    327:                        return;
                    328:                ip6 = mtod(m, struct ip6_hdr *);
                    329:        }
1.15      darrenr   330: #endif /* PFIL_HOOKS */
                    331:
1.2       itojun    332:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    333:
1.30      thorpej   334: #ifdef ALTQ
                    335:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    336:                /* packet is dropped by traffic conditioner */
                    337:                return;
1.9       itojun    338:        }
                    339: #endif
                    340:
1.2       itojun    341:        /*
1.41.2.2! thorpej   342:         * Check against address spoofing/corruption.
1.2       itojun    343:         */
                    344:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    345:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
                    346:                ip6stat.ip6s_badscope++;
1.9       itojun    347:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    348:                goto bad;
                    349:        }
1.13      itojun    350:        /*
1.41.2.2! thorpej   351:         * The following check is not documented in specs.  A malicious
        !           352:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
        !           353:         * and bypass security checks (act as if it was from 127.0.0.1 by using
        !           354:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    355:         *
1.41.2.2! thorpej   356:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
        !           357:         * support IPv4-less kernel compilation, we cannot support SIIT
        !           358:         * environment at all.  So, it makes more sense for us to reject any
        !           359:         * malicious packets for non-SIIT environment, than try to do a
        !           360:         * partical support for SIIT environment.
1.13      itojun    361:         */
                    362:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    363:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    364:                ip6stat.ip6s_badscope++;
                    365:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    366:                goto bad;
                    367:        }
1.17      itojun    368: #if 0
1.13      itojun    369:        /*
1.17      itojun    370:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    371:         *
                    372:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    373:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    374:         * is revised to forbid relaying case.
1.13      itojun    375:         */
                    376:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    377:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    378:                ip6stat.ip6s_badscope++;
                    379:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    380:                goto bad;
                    381:        }
                    382: #endif
1.35      itojun    383:
1.2       itojun    384:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    385:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    386:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    387:                        ours = 1;
1.9       itojun    388:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    389:                        goto hbhcheck;
                    390:                } else {
                    391:                        ip6stat.ip6s_badscope++;
1.9       itojun    392:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    393:                        goto bad;
                    394:                }
                    395:        }
                    396:
1.38      itojun    397:        /* drop packets if interface ID portion is already filled */
                    398:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    399:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
                    400:                    ip6->ip6_src.s6_addr16[1]) {
                    401:                        ip6stat.ip6s_badscope++;
                    402:                        goto bad;
                    403:                }
                    404:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
                    405:                    ip6->ip6_dst.s6_addr16[1]) {
                    406:                        ip6stat.ip6s_badscope++;
                    407:                        goto bad;
                    408:                }
                    409:        }
1.2       itojun    410:
1.40      itojun    411:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    412:                ip6->ip6_src.s6_addr16[1]
                    413:                        = htons(m->m_pkthdr.rcvif->if_index);
                    414:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    415:                ip6->ip6_dst.s6_addr16[1]
                    416:                        = htons(m->m_pkthdr.rcvif->if_index);
                    417:
                    418:        /*
                    419:         * We use rt->rt_ifp to determine if the address is ours or not.
                    420:         * If rt_ifp is lo0, the address is ours.
                    421:         * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
                    422:         * so any address under fe80::%lo0/64 will be mistakenly considered
                    423:         * local.  The special case is supplied to handle the case properly
                    424:         * by actually looking at interface addresses
                    425:         * (using in6ifa_ifpwithaddr).
                    426:         */
                    427:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
                    428:            IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    429:                if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
                    430:                        icmp6_error(m, ICMP6_DST_UNREACH,
                    431:                            ICMP6_DST_UNREACH_ADDR, 0);
                    432:                        /* m is already freed */
                    433:                        return;
1.21      itojun    434:                }
1.40      itojun    435:
                    436:                ours = 1;
                    437:                deliverifp = m->m_pkthdr.rcvif;
                    438:                goto hbhcheck;
1.9       itojun    439:        }
                    440:
1.2       itojun    441:        /*
                    442:         * Multicast check
                    443:         */
                    444:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    445:                struct  in6_multi *in6m = 0;
1.9       itojun    446:
                    447:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    448:                /*
                    449:                 * See if we belong to the destination multicast group on the
                    450:                 * arrival interface.
                    451:                 */
                    452:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    453:                if (in6m)
                    454:                        ours = 1;
                    455:                else if (!ip6_mrouter) {
                    456:                        ip6stat.ip6s_notmember++;
                    457:                        ip6stat.ip6s_cantforward++;
1.9       itojun    458:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    459:                        goto bad;
                    460:                }
1.9       itojun    461:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    462:                goto hbhcheck;
                    463:        }
                    464:
                    465:        /*
                    466:         *  Unicast check
                    467:         */
1.22      itojun    468:        if (ip6_forward_rt.ro_rt != NULL &&
                    469:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
                    470:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35      itojun    471:                               &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25      itojun    472:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    473:        else {
1.35      itojun    474:                struct sockaddr_in6 *dst6;
                    475:
1.2       itojun    476:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    477:                        /* route is down or destination is different */
1.25      itojun    478:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    479:                        RTFREE(ip6_forward_rt.ro_rt);
                    480:                        ip6_forward_rt.ro_rt = 0;
                    481:                }
1.22      itojun    482:
1.2       itojun    483:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35      itojun    484:                dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
                    485:                dst6->sin6_len = sizeof(struct sockaddr_in6);
                    486:                dst6->sin6_family = AF_INET6;
                    487:                dst6->sin6_addr = ip6->ip6_dst;
1.2       itojun    488:
1.9       itojun    489:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    490:        }
                    491:
                    492: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    493:
                    494:        /*
                    495:         * Accept the packet if the forwarding interface to the destination
                    496:         * according to the routing table is the loopback interface,
                    497:         * unless the associated route has a gateway.
                    498:         * Note that this approach causes to accept a packet if there is a
                    499:         * route to the loopback interface for the destination of the packet.
                    500:         * But we think it's even useful in some situations, e.g. when using
                    501:         * a special daemon which wants to intercept the packet.
                    502:         */
                    503:        if (ip6_forward_rt.ro_rt &&
                    504:            (ip6_forward_rt.ro_rt->rt_flags &
                    505:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    506: #if 0
                    507:            /*
                    508:             * The check below is redundant since the comparison of
                    509:             * the destination and the key of the rtentry has
                    510:             * already done through looking up the routing table.
                    511:             */
                    512:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                    513:                               &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
                    514: #endif
1.9       itojun    515:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    516:                struct in6_ifaddr *ia6 =
                    517:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    518:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    519:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    520:                /*
                    521:                 * packets to a tentative, duplicated, or somehow invalid
                    522:                 * address must not be accepted.
                    523:                 */
1.2       itojun    524:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    525:                        /* this address is ready */
1.2       itojun    526:                        ours = 1;
1.9       itojun    527:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    528:                        goto hbhcheck;
                    529:                } else {
1.24      itojun    530:                        /* address is not ready, so discard the packet. */
1.34      itojun    531:                        nd6log((LOG_INFO,
1.27      itojun    532:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    533:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    534:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    535:
                    536:                        goto bad;
1.2       itojun    537:                }
                    538:        }
                    539:
                    540:        /*
                    541:         * FAITH(Firewall Aided Internet Translator)
                    542:         */
                    543: #if defined(NFAITH) && 0 < NFAITH
                    544:        if (ip6_keepfaith) {
                    545:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    546:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    547:                        /* XXX do we need more sanity checks? */
                    548:                        ours = 1;
1.41.2.2! thorpej   549:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9       itojun    550:                        goto hbhcheck;
                    551:                }
                    552:        }
                    553: #endif
                    554:
                    555: #if 0
                    556:     {
                    557:        /*
                    558:         * Last resort: check in6_ifaddr for incoming interface.
                    559:         * The code is here until I update the "goto ours hack" code above
                    560:         * working right.
                    561:         */
                    562:        struct ifaddr *ifa;
                    563:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    564:             ifa;
                    565:             ifa = ifa->ifa_list.tqe_next) {
                    566:                if (ifa->ifa_addr == NULL)
                    567:                        continue;       /* just for safety */
                    568:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    569:                        continue;
                    570:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    571:                        ours = 1;
                    572:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    573:                        goto hbhcheck;
                    574:                }
                    575:        }
1.9       itojun    576:     }
1.2       itojun    577: #endif
                    578:
                    579:        /*
                    580:         * Now there is no reason to process the packet if it's not our own
                    581:         * and we're not a router.
                    582:         */
                    583:        if (!ip6_forwarding) {
                    584:                ip6stat.ip6s_cantforward++;
1.9       itojun    585:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    586:                goto bad;
                    587:        }
                    588:
                    589:   hbhcheck:
                    590:        /*
                    591:         * Process Hop-by-Hop options header if it's contained.
                    592:         * m may be modified in ip6_hopopts_input().
                    593:         * If a JumboPayload option is included, plen will also be modified.
                    594:         */
                    595:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    596:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    597:                struct ip6_hbh *hbh;
                    598:
                    599:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    600: #if 0  /*touches NULL pointer*/
                    601:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    602: #endif
1.2       itojun    603:                        return; /* m have already been freed */
1.9       itojun    604:                }
1.22      itojun    605:
1.2       itojun    606:                /* adjust pointer */
                    607:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    608:
                    609:                /*
1.41.2.2! thorpej   610:                 * if the payload length field is 0 and the next header field
1.22      itojun    611:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    612:                 * option MUST be included.
                    613:                 */
                    614:                if (ip6->ip6_plen == 0 && plen == 0) {
                    615:                        /*
                    616:                         * Note that if a valid jumbo payload option is
                    617:                         * contained, ip6_hoptops_input() must set a valid
                    618:                         * (non-zero) payload length to the variable plen.
                    619:                         */
                    620:                        ip6stat.ip6s_badoptions++;
                    621:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    622:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    623:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    624:                                    ICMP6_PARAMPROB_HEADER,
                    625:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    626:                        return;
                    627:                }
1.9       itojun    628: #ifndef PULLDOWN_TEST
                    629:                /* ip6_hopopts_input() ensures that mbuf is contiguous */
                    630:                hbh = (struct ip6_hbh *)(ip6 + 1);
                    631: #else
                    632:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    633:                        sizeof(struct ip6_hbh));
                    634:                if (hbh == NULL) {
                    635:                        ip6stat.ip6s_tooshort++;
                    636:                        return;
                    637:                }
                    638: #endif
                    639:                nxt = hbh->ip6h_nxt;
1.2       itojun    640:
                    641:                /*
                    642:                 * accept the packet if a router alert option is included
                    643:                 * and we act as an IPv6 router.
                    644:                 */
1.5       itojun    645:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    646:                        ours = 1;
                    647:        } else
                    648:                nxt = ip6->ip6_nxt;
                    649:
                    650:        /*
                    651:         * Check that the amount of data in the buffers
                    652:         * is as at least much as the IPv6 header would have us expect.
                    653:         * Trim mbufs if longer than we expect.
                    654:         * Drop packet if shorter than we expect.
                    655:         */
                    656:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    657:                ip6stat.ip6s_tooshort++;
1.9       itojun    658:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    659:                goto bad;
                    660:        }
                    661:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    662:                if (m->m_len == m->m_pkthdr.len) {
                    663:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    664:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    665:                } else
                    666:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    667:        }
                    668:
                    669:        /*
                    670:         * Forward if desirable.
                    671:         */
                    672:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    673:                /*
                    674:                 * If we are acting as a multicast router, all
                    675:                 * incoming multicast packets are passed to the
                    676:                 * kernel-level multicast forwarding function.
                    677:                 * The packet is returned (relatively) intact; if
                    678:                 * ip6_mforward() returns a non-zero value, the packet
                    679:                 * must be discarded, else it may be accepted below.
                    680:                 */
                    681:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    682:                        ip6stat.ip6s_cantforward++;
                    683:                        m_freem(m);
                    684:                        return;
                    685:                }
                    686:                if (!ours) {
                    687:                        m_freem(m);
                    688:                        return;
                    689:                }
1.22      itojun    690:        } else if (!ours) {
1.2       itojun    691:                ip6_forward(m, 0);
                    692:                return;
                    693:        }
1.25      itojun    694:
                    695:        ip6 = mtod(m, struct ip6_hdr *);
                    696:
                    697:        /*
                    698:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    699:         * tcp/udp stack and bypass security checks (act as if it was from
                    700:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    701:         *
                    702:         * For SIIT end node behavior, you may want to disable the check.
                    703:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    704:         * source.
                    705:         */
                    706:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    707:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    708:                ip6stat.ip6s_badscope++;
                    709:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    710:                goto bad;
                    711:        }
1.2       itojun    712:
                    713:        /*
                    714:         * Tell launch routine the next header
                    715:         */
1.12      itojun    716: #ifdef IFA_STATS
1.28      itojun    717:        if (deliverifp != NULL) {
1.9       itojun    718:                struct in6_ifaddr *ia6;
                    719:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    720:                if (ia6)
                    721:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    722:        }
                    723: #endif
1.2       itojun    724:        ip6stat.ip6s_delivered++;
1.9       itojun    725:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    726:        nest = 0;
1.40      itojun    727:
1.2       itojun    728:        while (nxt != IPPROTO_DONE) {
                    729:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    730:                        ip6stat.ip6s_toomanyhdr++;
                    731:                        goto bad;
                    732:                }
1.8       itojun    733:
                    734:                /*
                    735:                 * protection against faulty packet - there should be
                    736:                 * more sanity checks in header chain processing.
                    737:                 */
                    738:                if (m->m_pkthdr.len < off) {
                    739:                        ip6stat.ip6s_tooshort++;
1.9       itojun    740:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    741:                        goto bad;
                    742:                }
                    743:
1.37      itojun    744: #ifdef IPSEC
                    745:                /*
                    746:                 * enforce IPsec policy checking if we are seeing last header.
                    747:                 * note that we do not visit this with protocols with pcb layer
                    748:                 * code - like udp/tcp/raw ip.
                    749:                 */
                    750:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    751:                    ipsec6_in_reject(m, NULL)) {
                    752:                        ipsec6stat.in_polvio++;
                    753:                        goto bad;
                    754:                }
                    755: #endif
                    756:
1.2       itojun    757:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    758:        }
                    759:        return;
                    760:  bad:
                    761:        m_freem(m);
                    762: }
                    763:
                    764: /*
                    765:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    766:  * included, the real payload length will be stored in plenp.
                    767:  */
                    768: static int
                    769: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    770:        u_int32_t *plenp;
1.5       itojun    771:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    772:        struct mbuf **mp;
                    773:        int *offp;
                    774: {
1.35      itojun    775:        struct mbuf *m = *mp;
1.2       itojun    776:        int off = *offp, hbhlen;
                    777:        struct ip6_hbh *hbh;
                    778:        u_int8_t *opt;
                    779:
                    780:        /* validation of the length of the header */
1.9       itojun    781: #ifndef PULLDOWN_TEST
1.2       itojun    782:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
                    783:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    784:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    785:
                    786:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
                    787:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9       itojun    788: #else
                    789:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    790:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    791:        if (hbh == NULL) {
                    792:                ip6stat.ip6s_tooshort++;
                    793:                return -1;
                    794:        }
                    795:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    796:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    797:                hbhlen);
                    798:        if (hbh == NULL) {
                    799:                ip6stat.ip6s_tooshort++;
                    800:                return -1;
                    801:        }
                    802: #endif
1.2       itojun    803:        off += hbhlen;
                    804:        hbhlen -= sizeof(struct ip6_hbh);
                    805:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    806:
                    807:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    808:                                hbhlen, rtalertp, plenp) < 0)
                    809:                return(-1);
                    810:
                    811:        *offp = off;
                    812:        *mp = m;
                    813:        return(0);
                    814: }
                    815:
                    816: /*
                    817:  * Search header for all Hop-by-hop options and process each option.
                    818:  * This function is separate from ip6_hopopts_input() in order to
                    819:  * handle a case where the sending node itself process its hop-by-hop
                    820:  * options header. In such a case, the function is called from ip6_output().
                    821:  */
                    822: int
                    823: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    824:        struct mbuf *m;
                    825:        u_int8_t *opthead;
                    826:        int hbhlen;
1.5       itojun    827:        u_int32_t *rtalertp;
1.2       itojun    828:        u_int32_t *plenp;
                    829: {
                    830:        struct ip6_hdr *ip6;
                    831:        int optlen = 0;
                    832:        u_int8_t *opt = opthead;
                    833:        u_int16_t rtalert_val;
1.22      itojun    834:        u_int32_t jumboplen;
1.2       itojun    835:
                    836:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    837:                switch (*opt) {
                    838:                case IP6OPT_PAD1:
                    839:                        optlen = 1;
                    840:                        break;
                    841:                case IP6OPT_PADN:
                    842:                        if (hbhlen < IP6OPT_MINLEN) {
                    843:                                ip6stat.ip6s_toosmall++;
                    844:                                goto bad;
                    845:                        }
                    846:                        optlen = *(opt + 1) + 2;
                    847:                        break;
                    848:                case IP6OPT_RTALERT:
                    849:                        /* XXX may need check for alignment */
                    850:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    851:                                ip6stat.ip6s_toosmall++;
                    852:                                goto bad;
                    853:                        }
                    854:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
                    855:                                 /* XXX: should we discard the packet? */
                    856:                                log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
                    857:                                    *(opt + 1));
                    858:                        }
                    859:                        optlen = IP6OPT_RTALERT_LEN;
                    860:                        bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    861:                        *rtalertp = ntohs(rtalert_val);
                    862:                        break;
                    863:                case IP6OPT_JUMBO:
1.22      itojun    864:                        /* XXX may need check for alignment */
                    865:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    866:                                ip6stat.ip6s_toosmall++;
                    867:                                goto bad;
                    868:                        }
1.35      itojun    869:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
                    870:                                /* XXX: should we discard the packet? */
1.22      itojun    871:                                log(LOG_ERR, "length of jumbopayload opt "
1.27      itojun    872:                                    "is inconsistent(%d)\n",
1.22      itojun    873:                                    *(opt + 1));
1.35      itojun    874:                        }
1.22      itojun    875:                        optlen = IP6OPT_JUMBO_LEN;
                    876:
                    877:                        /*
                    878:                         * IPv6 packets that have non 0 payload length
1.35      itojun    879:                         * must not contain a jumbo payload option.
1.22      itojun    880:                         */
                    881:                        ip6 = mtod(m, struct ip6_hdr *);
                    882:                        if (ip6->ip6_plen) {
                    883:                                ip6stat.ip6s_badoptions++;
                    884:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    885:                                            ICMP6_PARAMPROB_HEADER,
                    886:                                            sizeof(struct ip6_hdr) +
                    887:                                            sizeof(struct ip6_hbh) +
                    888:                                            opt - opthead);
                    889:                                return(-1);
                    890:                        }
1.2       itojun    891:
1.22      itojun    892:                        /*
                    893:                         * We may see jumbolen in unaligned location, so
                    894:                         * we'd need to perform bcopy().
                    895:                         */
                    896:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    897:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    898:
                    899: #if 1
                    900:                        /*
                    901:                         * if there are multiple jumbo payload options,
                    902:                         * *plenp will be non-zero and the packet will be
                    903:                         * rejected.
                    904:                         * the behavior may need some debate in ipngwg -
                    905:                         * multiple options does not make sense, however,
                    906:                         * there's no explicit mention in specification.
                    907:                         */
                    908:                        if (*plenp != 0) {
                    909:                                ip6stat.ip6s_badoptions++;
                    910:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    911:                                            ICMP6_PARAMPROB_HEADER,
                    912:                                            sizeof(struct ip6_hdr) +
                    913:                                            sizeof(struct ip6_hbh) +
                    914:                                            opt + 2 - opthead);
                    915:                                return(-1);
                    916:                        }
1.8       itojun    917: #endif
1.2       itojun    918:
1.22      itojun    919:                        /*
                    920:                         * jumbo payload length must be larger than 65535.
                    921:                         */
                    922:                        if (jumboplen <= IPV6_MAXPACKET) {
                    923:                                ip6stat.ip6s_badoptions++;
                    924:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    925:                                            ICMP6_PARAMPROB_HEADER,
                    926:                                            sizeof(struct ip6_hdr) +
                    927:                                            sizeof(struct ip6_hbh) +
                    928:                                            opt + 2 - opthead);
                    929:                                return(-1);
                    930:                        }
                    931:                        *plenp = jumboplen;
                    932:
                    933:                        break;
1.35      itojun    934:                default:                /* unknown option */
                    935:                        if (hbhlen < IP6OPT_MINLEN) {
                    936:                                ip6stat.ip6s_toosmall++;
                    937:                                goto bad;
                    938:                        }
                    939:                        if ((optlen = ip6_unknown_opt(opt, m,
                    940:                                                      sizeof(struct ip6_hdr) +
                    941:                                                      sizeof(struct ip6_hbh) +
                    942:                                                      opt - opthead)) == -1)
                    943:                                return(-1);
                    944:                        optlen += 2;
                    945:                        break;
1.2       itojun    946:                }
                    947:        }
                    948:
                    949:        return(0);
                    950:
                    951:   bad:
                    952:        m_freem(m);
                    953:        return(-1);
                    954: }
                    955:
                    956: /*
                    957:  * Unknown option processing.
                    958:  * The third argument `off' is the offset from the IPv6 header to the option,
                    959:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    960:  * is not continuous in order to return an ICMPv6 error.
                    961:  */
                    962: int
                    963: ip6_unknown_opt(optp, m, off)
                    964:        u_int8_t *optp;
                    965:        struct mbuf *m;
                    966:        int off;
                    967: {
                    968:        struct ip6_hdr *ip6;
                    969:
1.35      itojun    970:        switch (IP6OPT_TYPE(*optp)) {
                    971:        case IP6OPT_TYPE_SKIP: /* ignore the option */
                    972:                return((int)*(optp + 1));
                    973:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                    974:                m_freem(m);
                    975:                return(-1);
                    976:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    977:                ip6stat.ip6s_badoptions++;
                    978:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
                    979:                return(-1);
                    980:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    981:                ip6stat.ip6s_badoptions++;
                    982:                ip6 = mtod(m, struct ip6_hdr *);
                    983:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    984:                    (m->m_flags & (M_BCAST|M_MCAST)))
                    985:                        m_freem(m);
                    986:                else
                    987:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    988:                                    ICMP6_PARAMPROB_OPTION, off);
                    989:                return(-1);
1.2       itojun    990:        }
                    991:
                    992:        m_freem(m);             /* XXX: NOTREACHED */
                    993:        return(-1);
                    994: }
                    995:
                    996: /*
1.9       itojun    997:  * Create the "control" list for this pcb.
                    998:  *
                    999:  * The routine will be called from upper layer handlers like tcp6_input().
                   1000:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1001:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1002:  * very first mbuf on the mbuf chain.
                   1003:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1004:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1005:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1006:  */
                   1007: void
                   1008: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun   1009:        struct in6pcb *in6p;
                   1010:        struct mbuf **mp;
                   1011:        struct ip6_hdr *ip6;
                   1012:        struct mbuf *m;
1.2       itojun   1013: {
                   1014:        struct proc *p = curproc;       /* XXX */
1.9       itojun   1015:        int privileged;
1.2       itojun   1016:
1.9       itojun   1017:        privileged = 0;
                   1018:        if (p && !suser(p->p_ucred, &p->p_acflag))
                   1019:                privileged++;
                   1020:
                   1021: #ifdef SO_TIMESTAMP
1.2       itojun   1022:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1023:                struct timeval tv;
                   1024:
                   1025:                microtime(&tv);
                   1026:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1027:                        SCM_TIMESTAMP, SOL_SOCKET);
                   1028:                if (*mp)
                   1029:                        mp = &(*mp)->m_next;
                   1030:        }
1.9       itojun   1031: #endif
1.2       itojun   1032:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                   1033:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
                   1034:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
                   1035:                        IPPROTO_IPV6);
                   1036:                if (*mp)
                   1037:                        mp = &(*mp)->m_next;
                   1038:        }
                   1039:
                   1040: #ifdef noyet
                   1041:        /* options were tossed above */
                   1042:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                   1043:                /* broken */
                   1044:        /* ip6_srcroute doesn't do what we want here, need to fix */
                   1045:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                   1046:                /* broken */
                   1047: #endif
                   1048:
                   1049:        /* RFC 2292 sec. 5 */
1.35      itojun   1050:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1051:                struct in6_pktinfo pi6;
                   1052:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                   1053:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                   1054:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                   1055:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                   1056:                                        ? m->m_pkthdr.rcvif->if_index
                   1057:                                        : 0;
                   1058:                *mp = sbcreatecontrol((caddr_t) &pi6,
                   1059:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
                   1060:                        IPPROTO_IPV6);
                   1061:                if (*mp)
                   1062:                        mp = &(*mp)->m_next;
                   1063:        }
                   1064:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1065:                int hlim = ip6->ip6_hlim & 0xff;
                   1066:                *mp = sbcreatecontrol((caddr_t) &hlim,
                   1067:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
                   1068:                if (*mp)
                   1069:                        mp = &(*mp)->m_next;
                   1070:        }
                   1071:        /* IN6P_NEXTHOP - for outgoing packet only */
                   1072:
                   1073:        /*
                   1074:         * IPV6_HOPOPTS socket option. We require super-user privilege
                   1075:         * for the option, but it might be too strict, since there might
                   1076:         * be some hop-by-hop options which can be returned to normal user.
                   1077:         * See RFC 2292 section 6.
                   1078:         */
1.35      itojun   1079:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2       itojun   1080:                /*
                   1081:                 * Check if a hop-by-hop options header is contatined in the
                   1082:                 * received packet, and if so, store the options as ancillary
                   1083:                 * data. Note that a hop-by-hop options header must be
                   1084:                 * just after the IPv6 header, which fact is assured through
                   1085:                 * the IPv6 input processing.
                   1086:                 */
                   1087:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1088:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1089:                        struct ip6_hbh *hbh;
                   1090:                        int hbhlen;
                   1091:
                   1092: #ifndef PULLDOWN_TEST
                   1093:                        hbh = (struct ip6_hbh *)(ip6 + 1);
                   1094:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1095: #else
                   1096:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1097:                                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                   1098:                        if (hbh == NULL) {
                   1099:                                ip6stat.ip6s_tooshort++;
                   1100:                                return;
                   1101:                        }
                   1102:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1103:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1104:                                sizeof(struct ip6_hdr), hbhlen);
                   1105:                        if (hbh == NULL) {
                   1106:                                ip6stat.ip6s_tooshort++;
                   1107:                                return;
                   1108:                        }
                   1109: #endif
1.2       itojun   1110:
                   1111:                        /*
                   1112:                         * XXX: We copy whole the header even if a jumbo
                   1113:                         * payload option is included, which option is to
                   1114:                         * be removed before returning in the RFC 2292.
                   1115:                         * But it's too painful operation...
                   1116:                         */
1.9       itojun   1117:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2       itojun   1118:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
                   1119:                        if (*mp)
                   1120:                                mp = &(*mp)->m_next;
                   1121:                }
                   1122:        }
                   1123:
                   1124:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1125:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1126:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1127:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
                   1128:
                   1129:                /*
                   1130:                 * Search for destination options headers or routing
                   1131:                 * header(s) through the header chain, and stores each
                   1132:                 * header as ancillary data.
                   1133:                 * Note that the order of the headers remains in
                   1134:                 * the chain of ancillary data.
                   1135:                 */
1.35      itojun   1136:                while (1) {     /* is explicit loop prevention necessary? */
1.9       itojun   1137:                        struct ip6_ext *ip6e;
                   1138:                        int elen;
                   1139:
                   1140: #ifndef PULLDOWN_TEST
                   1141:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
                   1142:                        if (nxt == IPPROTO_AH)
                   1143:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1144:                        else
                   1145:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1146: #else
                   1147:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
                   1148:                                sizeof(struct ip6_ext));
                   1149:                        if (ip6e == NULL) {
                   1150:                                ip6stat.ip6s_tooshort++;
                   1151:                                return;
                   1152:                        }
                   1153:                        if (nxt == IPPROTO_AH)
                   1154:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1155:                        else
                   1156:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1157:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
                   1158:                        if (ip6e == NULL) {
                   1159:                                ip6stat.ip6s_tooshort++;
                   1160:                                return;
                   1161:                        }
                   1162: #endif
1.2       itojun   1163:
1.35      itojun   1164:                        switch (nxt) {
                   1165:                        case IPPROTO_DSTOPTS:
                   1166:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1167:                                        break;
                   1168:
                   1169:                                /*
                   1170:                                 * We also require super-user privilege for
                   1171:                                 * the option.
                   1172:                                 * See the comments on IN6_HOPOPTS.
                   1173:                                 */
                   1174:                                if (!privileged)
                   1175:                                        break;
                   1176:
                   1177:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1178:                                                      IPV6_DSTOPTS,
                   1179:                                                      IPPROTO_IPV6);
                   1180:                                if (*mp)
                   1181:                                        mp = &(*mp)->m_next;
                   1182:                                break;
                   1183:
                   1184:                        case IPPROTO_ROUTING:
                   1185:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1186:                                        break;
                   1187:
                   1188:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1189:                                                      IPV6_RTHDR,
                   1190:                                                      IPPROTO_IPV6);
                   1191:                                if (*mp)
                   1192:                                        mp = &(*mp)->m_next;
                   1193:                                break;
                   1194:
                   1195:                        case IPPROTO_UDP:
                   1196:                        case IPPROTO_TCP:
                   1197:                        case IPPROTO_ICMPV6:
                   1198:                        default:
                   1199:                                /*
                   1200:                                 * stop search if we encounter an upper
                   1201:                                 * layer protocol headers.
                   1202:                                 */
                   1203:                                goto loopend;
                   1204:
                   1205:                        case IPPROTO_HOPOPTS:
                   1206:                        case IPPROTO_AH: /* is it possible? */
                   1207:                                break;
1.2       itojun   1208:                        }
                   1209:
                   1210:                        /* proceed with the next header. */
1.9       itojun   1211:                        off += elen;
1.2       itojun   1212:                        nxt = ip6e->ip6e_nxt;
                   1213:                }
                   1214:          loopend:
1.36      cgd      1215:                ;
1.2       itojun   1216:        }
1.9       itojun   1217:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun   1218:                /* to be done */
                   1219:        }
1.9       itojun   1220:        if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2       itojun   1221:                /* to be done */
                   1222:        }
                   1223:        /* IN6P_RTHDR - to be done */
                   1224:
                   1225: }
                   1226:
                   1227: /*
                   1228:  * Get pointer to the previous header followed by the header
                   1229:  * currently processed.
                   1230:  * XXX: This function supposes that
                   1231:  *     M includes all headers,
                   1232:  *     the next header field and the header length field of each header
                   1233:  *     are valid, and
                   1234:  *     the sum of each header length equals to OFF.
                   1235:  * Because of these assumptions, this function must be called very
                   1236:  * carefully. Moreover, it will not be used in the near future when
                   1237:  * we develop `neater' mechanism to process extension headers.
                   1238:  */
                   1239: char *
                   1240: ip6_get_prevhdr(m, off)
                   1241:        struct mbuf *m;
                   1242:        int off;
                   1243: {
                   1244:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1245:
                   1246:        if (off == sizeof(struct ip6_hdr))
                   1247:                return(&ip6->ip6_nxt);
                   1248:        else {
                   1249:                int len, nxt;
                   1250:                struct ip6_ext *ip6e = NULL;
                   1251:
                   1252:                nxt = ip6->ip6_nxt;
                   1253:                len = sizeof(struct ip6_hdr);
                   1254:                while (len < off) {
                   1255:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1256:
1.35      itojun   1257:                        switch (nxt) {
1.2       itojun   1258:                        case IPPROTO_FRAGMENT:
                   1259:                                len += sizeof(struct ip6_frag);
                   1260:                                break;
                   1261:                        case IPPROTO_AH:
                   1262:                                len += (ip6e->ip6e_len + 2) << 2;
                   1263:                                break;
                   1264:                        default:
                   1265:                                len += (ip6e->ip6e_len + 1) << 3;
                   1266:                                break;
                   1267:                        }
                   1268:                        nxt = ip6e->ip6e_nxt;
                   1269:                }
                   1270:                if (ip6e)
                   1271:                        return(&ip6e->ip6e_nxt);
                   1272:                else
                   1273:                        return NULL;
1.18      itojun   1274:        }
                   1275: }
                   1276:
                   1277: /*
                   1278:  * get next header offset.  m will be retained.
                   1279:  */
                   1280: int
                   1281: ip6_nexthdr(m, off, proto, nxtp)
                   1282:        struct mbuf *m;
                   1283:        int off;
                   1284:        int proto;
                   1285:        int *nxtp;
                   1286: {
                   1287:        struct ip6_hdr ip6;
                   1288:        struct ip6_ext ip6e;
                   1289:        struct ip6_frag fh;
                   1290:
                   1291:        /* just in case */
                   1292:        if (m == NULL)
                   1293:                panic("ip6_nexthdr: m == NULL");
                   1294:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1295:                return -1;
                   1296:
                   1297:        switch (proto) {
                   1298:        case IPPROTO_IPV6:
                   1299:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1300:                        return -1;
                   1301:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1302:                if (nxtp)
                   1303:                        *nxtp = ip6.ip6_nxt;
                   1304:                off += sizeof(ip6);
                   1305:                return off;
                   1306:
                   1307:        case IPPROTO_FRAGMENT:
                   1308:                /*
                   1309:                 * terminate parsing if it is not the first fragment,
                   1310:                 * it does not make sense to parse through it.
                   1311:                 */
                   1312:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1313:                        return -1;
                   1314:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
                   1315:                if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
                   1316:                        return -1;
                   1317:                if (nxtp)
                   1318:                        *nxtp = fh.ip6f_nxt;
                   1319:                off += sizeof(struct ip6_frag);
                   1320:                return off;
                   1321:
                   1322:        case IPPROTO_AH:
                   1323:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1324:                        return -1;
                   1325:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1326:                if (nxtp)
                   1327:                        *nxtp = ip6e.ip6e_nxt;
                   1328:                off += (ip6e.ip6e_len + 2) << 2;
1.41.2.2! thorpej  1329:                if (m->m_pkthdr.len < off)
        !          1330:                        return -1;
1.18      itojun   1331:                return off;
                   1332:
                   1333:        case IPPROTO_HOPOPTS:
                   1334:        case IPPROTO_ROUTING:
                   1335:        case IPPROTO_DSTOPTS:
                   1336:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1337:                        return -1;
                   1338:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1339:                if (nxtp)
                   1340:                        *nxtp = ip6e.ip6e_nxt;
                   1341:                off += (ip6e.ip6e_len + 1) << 3;
1.41.2.2! thorpej  1342:                if (m->m_pkthdr.len < off)
        !          1343:                        return -1;
1.18      itojun   1344:                return off;
                   1345:
                   1346:        case IPPROTO_NONE:
                   1347:        case IPPROTO_ESP:
                   1348:        case IPPROTO_IPCOMP:
                   1349:                /* give up */
                   1350:                return -1;
                   1351:
                   1352:        default:
                   1353:                return -1;
                   1354:        }
                   1355:
                   1356:        return -1;
                   1357: }
                   1358:
                   1359: /*
                   1360:  * get offset for the last header in the chain.  m will be kept untainted.
                   1361:  */
                   1362: int
                   1363: ip6_lasthdr(m, off, proto, nxtp)
                   1364:        struct mbuf *m;
                   1365:        int off;
                   1366:        int proto;
                   1367:        int *nxtp;
                   1368: {
                   1369:        int newoff;
                   1370:        int nxt;
                   1371:
                   1372:        if (!nxtp) {
                   1373:                nxt = -1;
                   1374:                nxtp = &nxt;
                   1375:        }
                   1376:        while (1) {
                   1377:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1378:                if (newoff < 0)
                   1379:                        return off;
                   1380:                else if (newoff < off)
                   1381:                        return -1;      /* invalid */
                   1382:                else if (newoff == off)
                   1383:                        return newoff;
                   1384:
                   1385:                off = newoff;
                   1386:                proto = *nxtp;
1.2       itojun   1387:        }
                   1388: }
                   1389:
                   1390: /*
                   1391:  * System control for IP6
                   1392:  */
                   1393:
                   1394: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1395:        0,              0,              0,              0,
                   1396:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1397:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1398:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1399:        0,              0,              0,              0,
                   1400:        ENOPROTOOPT
                   1401: };
                   1402:
                   1403: int
                   1404: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1405:        int *name;
                   1406:        u_int namelen;
                   1407:        void *oldp;
                   1408:        size_t *oldlenp;
                   1409:        void *newp;
                   1410:        size_t newlen;
                   1411: {
1.26      itojun   1412:        int old, error;
                   1413:
1.2       itojun   1414:        /* All sysctl names at this level are terminal. */
                   1415:        if (namelen != 1)
                   1416:                return ENOTDIR;
                   1417:
                   1418:        switch (name[0]) {
                   1419:
                   1420:        case IPV6CTL_FORWARDING:
                   1421:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1422:                                  &ip6_forwarding);
                   1423:        case IPV6CTL_SENDREDIRECTS:
                   1424:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1425:                                &ip6_sendredirects);
                   1426:        case IPV6CTL_DEFHLIM:
                   1427:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                   1428:        case IPV6CTL_MAXFRAGPACKETS:
                   1429:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1430:                                &ip6_maxfragpackets);
                   1431:        case IPV6CTL_ACCEPT_RTADV:
                   1432:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1433:                                &ip6_accept_rtadv);
                   1434:        case IPV6CTL_KEEPFAITH:
                   1435:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                   1436:        case IPV6CTL_LOG_INTERVAL:
                   1437:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1438:                                &ip6_log_interval);
                   1439:        case IPV6CTL_HDRNESTLIMIT:
                   1440:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1441:                                &ip6_hdrnestlimit);
                   1442:        case IPV6CTL_DAD_COUNT:
                   1443:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1444:        case IPV6CTL_AUTO_FLOWLABEL:
                   1445:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1446:                                &ip6_auto_flowlabel);
                   1447:        case IPV6CTL_DEFMCASTHLIM:
                   1448:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1449:                                &ip6_defmcasthlim);
1.41.2.2! thorpej  1450: #if NGIF > 0
1.2       itojun   1451:        case IPV6CTL_GIF_HLIM:
                   1452:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1453:                                &ip6_gif_hlim);
1.41.2.2! thorpej  1454: #endif
1.2       itojun   1455:        case IPV6CTL_KAME_VERSION:
                   1456:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9       itojun   1457:        case IPV6CTL_USE_DEPRECATED:
                   1458:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1459:                                &ip6_use_deprecated);
1.10      itojun   1460:        case IPV6CTL_RR_PRUNE:
                   1461:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.41.2.2! thorpej  1462:        case IPV6CTL_V6ONLY:
        !          1463: #ifdef INET6_BINDV6ONLY
        !          1464:                return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
        !          1465: #else
        !          1466:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26      itojun   1467: #endif
                   1468:        case IPV6CTL_ANONPORTMIN:
                   1469:                old = ip6_anonportmin;
                   1470:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1471:                    &ip6_anonportmin);
                   1472:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
                   1473:                    ip6_anonportmin > 65535
                   1474: #ifndef IPNOPRIVPORTS
                   1475:                    || ip6_anonportmin < IPV6PORT_RESERVED
                   1476: #endif
                   1477:                    ) {
                   1478:                        ip6_anonportmin = old;
                   1479:                        return (EINVAL);
                   1480:                }
                   1481:                return (error);
                   1482:        case IPV6CTL_ANONPORTMAX:
                   1483:                old = ip6_anonportmax;
                   1484:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1485:                    &ip6_anonportmax);
                   1486:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
                   1487:                    ip6_anonportmax > 65535
                   1488: #ifndef IPNOPRIVPORTS
                   1489:                    || ip6_anonportmax < IPV6PORT_RESERVED
                   1490: #endif
                   1491:                    ) {
                   1492:                        ip6_anonportmax = old;
                   1493:                        return (EINVAL);
                   1494:                }
                   1495:                return (error);
                   1496: #ifndef IPNOPRIVPORTS
                   1497:        case IPV6CTL_LOWPORTMIN:
                   1498:                old = ip6_lowportmin;
                   1499:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1500:                    &ip6_lowportmin);
                   1501:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1502:                    ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
                   1503:                    ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
                   1504:                        ip6_lowportmin = old;
                   1505:                        return (EINVAL);
                   1506:                }
                   1507:                return (error);
                   1508:        case IPV6CTL_LOWPORTMAX:
                   1509:                old = ip6_lowportmax;
                   1510:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1511:                    &ip6_lowportmax);
                   1512:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1513:                    ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
                   1514:                    ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
                   1515:                        ip6_lowportmax = old;
                   1516:                        return (EINVAL);
                   1517:                }
                   1518:                return (error);
1.11      itojun   1519: #endif
1.2       itojun   1520:        default:
                   1521:                return EOPNOTSUPP;
                   1522:        }
                   1523:        /* NOTREACHED */
                   1524: }

CVSweb <webmaster@jp.NetBSD.org>