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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.37.2.8

1.37.2.8! nathanw     1: /*     $NetBSD: ip6_input.c,v 1.37.2.7 2001/11/14 19:18:09 nathanw Exp $       */
1.37.2.3  nathanw     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:
1.37.2.7  nathanw    68: #include <sys/cdefs.h>
1.37.2.8! nathanw    69: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.37.2.7 2001/11/14 19:18:09 nathanw Exp $");
1.37.2.7  nathanw    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>
1.37.2.1  nathanw    87: #include <sys/lwp.h>
1.2       itojun     88: #include <sys/proc.h>
1.37.2.7  nathanw    89: #include <sys/sysctl.h>
1.2       itojun     90:
                     91: #include <net/if.h>
                     92: #include <net/if_types.h>
                     93: #include <net/if_dl.h>
                     94: #include <net/route.h>
                     95: #include <net/netisr.h>
1.15      darrenr    96: #ifdef PFIL_HOOKS
                     97: #include <net/pfil.h>
                     98: #endif
1.2       itojun     99:
                    100: #include <netinet/in.h>
1.9       itojun    101: #include <netinet/in_systm.h>
                    102: #ifdef INET
                    103: #include <netinet/ip.h>
                    104: #include <netinet/ip_icmp.h>
1.37.2.7  nathanw   105: #endif /* INET */
1.14      itojun    106: #include <netinet/ip6.h>
1.2       itojun    107: #include <netinet6/in6_var.h>
1.11      itojun    108: #include <netinet6/ip6_var.h>
1.2       itojun    109: #include <netinet6/in6_pcb.h>
1.14      itojun    110: #include <netinet/icmp6.h>
1.2       itojun    111: #include <netinet6/in6_ifattach.h>
                    112: #include <netinet6/nd6.h>
1.9       itojun    113: #include <netinet6/in6_prefix.h>
1.2       itojun    114:
1.37      itojun    115: #ifdef IPSEC
                    116: #include <netinet6/ipsec.h>
                    117: #endif
                    118:
1.2       itojun    119: #include <netinet6/ip6protosw.h>
                    120:
                    121: /* we need it for NLOOP. */
                    122: #include "loop.h"
                    123: #include "faith.h"
                    124: #include "gif.h"
                    125: #include "bpfilter.h"
                    126:
1.37.2.8! nathanw   127: #if NGIF > 0
        !           128: #include <netinet6/in6_gif.h>
        !           129: #endif
        !           130:
1.9       itojun    131: #include <net/net_osdep.h>
                    132:
1.2       itojun    133: extern struct domain inet6domain;
                    134:
                    135: u_char ip6_protox[IPPROTO_MAX];
                    136: static int ip6qmaxlen = IFQ_MAXLEN;
                    137: struct in6_ifaddr *in6_ifaddr;
                    138: struct ifqueue ip6intrq;
                    139:
                    140: extern struct ifnet loif[NLOOP];
                    141: int ip6_forward_srcrt;                 /* XXX */
                    142: int ip6_sourcecheck;                   /* XXX */
                    143: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    144:
1.29      thorpej   145: #ifdef PFIL_HOOKS
                    146: struct pfil_head inet6_pfil_hook;
                    147: #endif
                    148:
1.2       itojun    149: struct ip6stat ip6stat;
                    150:
                    151: static void ip6_init2 __P((void *));
                    152:
1.5       itojun    153: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2       itojun    154:
                    155: /*
                    156:  * IP6 initialization: fill in IP6 protocol switch table.
                    157:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    158:  */
                    159: void
                    160: ip6_init()
                    161: {
1.35      itojun    162:        struct ip6protosw *pr;
                    163:        int i;
1.2       itojun    164:        struct timeval tv;
                    165:
                    166:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    167:        if (pr == 0)
                    168:                panic("ip6_init");
                    169:        for (i = 0; i < IPPROTO_MAX; i++)
                    170:                ip6_protox[i] = pr - inet6sw;
                    171:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    172:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    173:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    174:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    175:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    176:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    177:        nd6_init();
                    178:        frag6_init();
                    179:        /*
                    180:         * in many cases, random() here does NOT return random number
                    181:         * as initialization during bootstrap time occur in fixed order.
                    182:         */
                    183:        microtime(&tv);
                    184:        ip6_flow_seq = random() ^ tv.tv_usec;
                    185:
                    186:        ip6_init2((void *)0);
1.29      thorpej   187:
                    188: #ifdef PFIL_HOOKS
                    189:        /* Register our Packet Filter hook. */
1.33      thorpej   190:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    191:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   192:        i = pfil_head_register(&inet6_pfil_hook);
                    193:        if (i != 0)
                    194:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    195:                    "error %d\n", i);
                    196: #endif /* PFIL_HOOKS */
1.2       itojun    197: }
                    198:
                    199: static void
                    200: ip6_init2(dummy)
                    201:        void *dummy;
                    202: {
                    203:        /*
                    204:         * to route local address of p2p link to loopback,
1.21      itojun    205:         * assign loopback address first.
1.2       itojun    206:         */
1.20      itojun    207:        in6_ifattach(&loif[0], NULL);
1.2       itojun    208:
                    209:        /* nd6_timer_init */
1.19      thorpej   210:        callout_init(&nd6_timer_ch);
                    211:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9       itojun    212:        /* router renumbering prefix list maintenance */
1.19      thorpej   213:        callout_init(&in6_rr_timer_ch);
                    214:        callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2       itojun    215: }
                    216:
                    217: /*
                    218:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    219:  */
                    220: void
                    221: ip6intr()
                    222: {
                    223:        int s;
                    224:        struct mbuf *m;
                    225:
                    226:        for (;;) {
1.37.2.4  nathanw   227:                s = splnet();
1.2       itojun    228:                IF_DEQUEUE(&ip6intrq, m);
                    229:                splx(s);
                    230:                if (m == 0)
                    231:                        return;
                    232:                ip6_input(m);
                    233:        }
                    234: }
                    235:
                    236: extern struct  route_in6 ip6_forward_rt;
                    237:
                    238: void
                    239: ip6_input(m)
                    240:        struct mbuf *m;
                    241: {
1.9       itojun    242:        struct ip6_hdr *ip6;
1.2       itojun    243:        int off = sizeof(struct ip6_hdr), nest;
                    244:        u_int32_t plen;
1.5       itojun    245:        u_int32_t rtalert = ~0;
1.2       itojun    246:        int nxt, ours = 0;
1.9       itojun    247:        struct ifnet *deliverifp = NULL;
1.2       itojun    248:
                    249: #ifdef IPSEC
                    250:        /*
                    251:         * should the inner packet be considered authentic?
                    252:         * see comment in ah4_input().
                    253:         */
1.37.2.8! nathanw   254:        m->m_flags &= ~M_AUTHIPHDR;
        !           255:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    256: #endif
1.9       itojun    257:
1.2       itojun    258:        /*
1.37.2.6  nathanw   259:         * mbuf statistics
1.2       itojun    260:         */
                    261:        if (m->m_flags & M_EXT) {
                    262:                if (m->m_next)
                    263:                        ip6stat.ip6s_mext2m++;
                    264:                else
                    265:                        ip6stat.ip6s_mext1++;
                    266:        } else {
1.37.2.3  nathanw   267: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2       itojun    268:                if (m->m_next) {
1.9       itojun    269:                        if (m->m_flags & M_LOOP) {
1.37.2.6  nathanw   270:                                ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.37.2.3  nathanw   271:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    272:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    273:                        else
                    274:                                ip6stat.ip6s_m2m[0]++;
                    275:                } else
                    276:                        ip6stat.ip6s_m1++;
1.37.2.3  nathanw   277: #undef M2MMAX
1.2       itojun    278:        }
                    279:
1.9       itojun    280:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    281:        ip6stat.ip6s_total++;
                    282:
                    283: #ifndef PULLDOWN_TEST
                    284:        /* XXX is the line really necessary? */
1.2       itojun    285:        IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9       itojun    286: #endif
1.2       itojun    287:
1.9       itojun    288:        if (m->m_len < sizeof(struct ip6_hdr)) {
                    289:                struct ifnet *inifp;
                    290:                inifp = m->m_pkthdr.rcvif;
                    291:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
                    292:                        ip6stat.ip6s_toosmall++;
                    293:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    294:                        return;
                    295:                }
1.2       itojun    296:        }
                    297:
                    298:        ip6 = mtod(m, struct ip6_hdr *);
                    299:
                    300:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    301:                ip6stat.ip6s_badvers++;
1.9       itojun    302:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    303:                goto bad;
                    304:        }
1.15      darrenr   305:
                    306: #ifdef PFIL_HOOKS
                    307:        /*
                    308:         * Run through list of hooks for input packets.  If there are any
                    309:         * filters which require that additional packets in the flow are
                    310:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    311:         * Note that filters must _never_ set this flag, as another filter
                    312:         * in the list may have previously cleared it.
                    313:         */
1.37.2.3  nathanw   314:        /*
                    315:         * let ipfilter look at packet on the wire,
                    316:         * not the decapsulated packet.
                    317:         */
                    318: #ifdef IPSEC
1.37.2.5  nathanw   319:        if (!ipsec_getnhist(m))
1.37.2.3  nathanw   320: #else
                    321:        if (1)
                    322: #endif
                    323:        {
                    324:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    325:                                   PFIL_IN) != 0)
                    326:                        return;
                    327:                if (m == NULL)
                    328:                        return;
                    329:                ip6 = mtod(m, struct ip6_hdr *);
                    330:        }
1.15      darrenr   331: #endif /* PFIL_HOOKS */
                    332:
1.2       itojun    333:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    334:
1.30      thorpej   335: #ifdef ALTQ
                    336:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    337:                /* packet is dropped by traffic conditioner */
                    338:                return;
1.9       itojun    339:        }
                    340: #endif
                    341:
1.2       itojun    342:        /*
1.37.2.6  nathanw   343:         * Check against address spoofing/corruption.
1.2       itojun    344:         */
                    345:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    346:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
                    347:                ip6stat.ip6s_badscope++;
1.9       itojun    348:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    349:                goto bad;
                    350:        }
1.13      itojun    351:        /*
1.37.2.6  nathanw   352:         * The following check is not documented in specs.  A malicious
                    353:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    354:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    355:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    356:         *
1.37.2.6  nathanw   357:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    358:         * support IPv4-less kernel compilation, we cannot support SIIT
                    359:         * environment at all.  So, it makes more sense for us to reject any
                    360:         * malicious packets for non-SIIT environment, than try to do a
                    361:         * partical support for SIIT environment.
1.13      itojun    362:         */
                    363:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    364:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    365:                ip6stat.ip6s_badscope++;
                    366:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    367:                goto bad;
                    368:        }
1.17      itojun    369: #if 0
1.13      itojun    370:        /*
1.17      itojun    371:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    372:         *
                    373:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    374:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    375:         * is revised to forbid relaying case.
1.13      itojun    376:         */
                    377:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    378:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    379:                ip6stat.ip6s_badscope++;
                    380:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    381:                goto bad;
                    382:        }
                    383: #endif
1.35      itojun    384:
1.2       itojun    385:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    386:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    387:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    388:                        ours = 1;
1.9       itojun    389:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    390:                        goto hbhcheck;
                    391:                } else {
                    392:                        ip6stat.ip6s_badscope++;
1.9       itojun    393:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    394:                        goto bad;
                    395:                }
                    396:        }
                    397:
1.37.2.3  nathanw   398:        /* drop packets if interface ID portion is already filled */
                    399:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    400:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
                    401:                    ip6->ip6_src.s6_addr16[1]) {
                    402:                        ip6stat.ip6s_badscope++;
                    403:                        goto bad;
                    404:                }
                    405:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
                    406:                    ip6->ip6_dst.s6_addr16[1]) {
                    407:                        ip6stat.ip6s_badscope++;
                    408:                        goto bad;
                    409:                }
1.2       itojun    410:        }
                    411:
1.37.2.3  nathanw   412:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    413:                ip6->ip6_src.s6_addr16[1]
                    414:                        = htons(m->m_pkthdr.rcvif->if_index);
                    415:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    416:                ip6->ip6_dst.s6_addr16[1]
                    417:                        = htons(m->m_pkthdr.rcvif->if_index);
                    418:
                    419:        /*
                    420:         * We use rt->rt_ifp to determine if the address is ours or not.
                    421:         * If rt_ifp is lo0, the address is ours.
                    422:         * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
                    423:         * so any address under fe80::%lo0/64 will be mistakenly considered
                    424:         * local.  The special case is supplied to handle the case properly
                    425:         * by actually looking at interface addresses
                    426:         * (using in6ifa_ifpwithaddr).
                    427:         */
                    428:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
                    429:            IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    430:                if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
                    431:                        icmp6_error(m, ICMP6_DST_UNREACH,
                    432:                            ICMP6_DST_UNREACH_ADDR, 0);
                    433:                        /* m is already freed */
                    434:                        return;
1.21      itojun    435:                }
1.37.2.3  nathanw   436:
                    437:                ours = 1;
                    438:                deliverifp = m->m_pkthdr.rcvif;
                    439:                goto hbhcheck;
1.9       itojun    440:        }
                    441:
1.2       itojun    442:        /*
                    443:         * Multicast check
                    444:         */
                    445:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    446:                struct  in6_multi *in6m = 0;
1.9       itojun    447:
                    448:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    449:                /*
                    450:                 * See if we belong to the destination multicast group on the
                    451:                 * arrival interface.
                    452:                 */
                    453:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    454:                if (in6m)
                    455:                        ours = 1;
                    456:                else if (!ip6_mrouter) {
                    457:                        ip6stat.ip6s_notmember++;
                    458:                        ip6stat.ip6s_cantforward++;
1.9       itojun    459:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    460:                        goto bad;
                    461:                }
1.9       itojun    462:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    463:                goto hbhcheck;
                    464:        }
                    465:
                    466:        /*
                    467:         *  Unicast check
                    468:         */
1.22      itojun    469:        if (ip6_forward_rt.ro_rt != NULL &&
                    470:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
                    471:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35      itojun    472:                               &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25      itojun    473:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    474:        else {
1.35      itojun    475:                struct sockaddr_in6 *dst6;
                    476:
1.2       itojun    477:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    478:                        /* route is down or destination is different */
1.25      itojun    479:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    480:                        RTFREE(ip6_forward_rt.ro_rt);
                    481:                        ip6_forward_rt.ro_rt = 0;
                    482:                }
1.22      itojun    483:
1.2       itojun    484:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35      itojun    485:                dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
                    486:                dst6->sin6_len = sizeof(struct sockaddr_in6);
                    487:                dst6->sin6_family = AF_INET6;
                    488:                dst6->sin6_addr = ip6->ip6_dst;
1.2       itojun    489:
1.9       itojun    490:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    491:        }
                    492:
                    493: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    494:
                    495:        /*
                    496:         * Accept the packet if the forwarding interface to the destination
                    497:         * according to the routing table is the loopback interface,
                    498:         * unless the associated route has a gateway.
                    499:         * Note that this approach causes to accept a packet if there is a
                    500:         * route to the loopback interface for the destination of the packet.
                    501:         * But we think it's even useful in some situations, e.g. when using
                    502:         * a special daemon which wants to intercept the packet.
                    503:         */
                    504:        if (ip6_forward_rt.ro_rt &&
                    505:            (ip6_forward_rt.ro_rt->rt_flags &
                    506:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    507: #if 0
                    508:            /*
                    509:             * The check below is redundant since the comparison of
                    510:             * the destination and the key of the rtentry has
                    511:             * already done through looking up the routing table.
                    512:             */
                    513:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                    514:                               &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
                    515: #endif
1.9       itojun    516:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    517:                struct in6_ifaddr *ia6 =
                    518:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    519:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    520:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    521:                /*
                    522:                 * packets to a tentative, duplicated, or somehow invalid
                    523:                 * address must not be accepted.
                    524:                 */
1.2       itojun    525:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    526:                        /* this address is ready */
1.2       itojun    527:                        ours = 1;
1.9       itojun    528:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    529:                        goto hbhcheck;
                    530:                } else {
1.24      itojun    531:                        /* address is not ready, so discard the packet. */
1.34      itojun    532:                        nd6log((LOG_INFO,
1.27      itojun    533:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    534:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    535:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    536:
                    537:                        goto bad;
1.2       itojun    538:                }
                    539:        }
                    540:
                    541:        /*
                    542:         * FAITH(Firewall Aided Internet Translator)
                    543:         */
                    544: #if defined(NFAITH) && 0 < NFAITH
                    545:        if (ip6_keepfaith) {
                    546:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    547:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    548:                        /* XXX do we need more sanity checks? */
                    549:                        ours = 1;
1.37.2.7  nathanw   550:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9       itojun    551:                        goto hbhcheck;
                    552:                }
                    553:        }
                    554: #endif
                    555:
                    556: #if 0
                    557:     {
                    558:        /*
                    559:         * Last resort: check in6_ifaddr for incoming interface.
                    560:         * The code is here until I update the "goto ours hack" code above
                    561:         * working right.
                    562:         */
                    563:        struct ifaddr *ifa;
                    564:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    565:             ifa;
                    566:             ifa = ifa->ifa_list.tqe_next) {
                    567:                if (ifa->ifa_addr == NULL)
                    568:                        continue;       /* just for safety */
                    569:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    570:                        continue;
                    571:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    572:                        ours = 1;
                    573:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    574:                        goto hbhcheck;
                    575:                }
                    576:        }
1.9       itojun    577:     }
1.2       itojun    578: #endif
                    579:
                    580:        /*
                    581:         * Now there is no reason to process the packet if it's not our own
                    582:         * and we're not a router.
                    583:         */
                    584:        if (!ip6_forwarding) {
                    585:                ip6stat.ip6s_cantforward++;
1.9       itojun    586:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    587:                goto bad;
                    588:        }
                    589:
                    590:   hbhcheck:
                    591:        /*
                    592:         * Process Hop-by-Hop options header if it's contained.
                    593:         * m may be modified in ip6_hopopts_input().
                    594:         * If a JumboPayload option is included, plen will also be modified.
                    595:         */
                    596:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    597:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    598:                struct ip6_hbh *hbh;
                    599:
                    600:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    601: #if 0  /*touches NULL pointer*/
                    602:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    603: #endif
1.2       itojun    604:                        return; /* m have already been freed */
1.9       itojun    605:                }
1.22      itojun    606:
1.2       itojun    607:                /* adjust pointer */
                    608:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    609:
                    610:                /*
1.37.2.8! nathanw   611:                 * if the payload length field is 0 and the next header field
1.22      itojun    612:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    613:                 * option MUST be included.
                    614:                 */
                    615:                if (ip6->ip6_plen == 0 && plen == 0) {
                    616:                        /*
                    617:                         * Note that if a valid jumbo payload option is
                    618:                         * contained, ip6_hoptops_input() must set a valid
                    619:                         * (non-zero) payload length to the variable plen.
                    620:                         */
                    621:                        ip6stat.ip6s_badoptions++;
                    622:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    623:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    624:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    625:                                    ICMP6_PARAMPROB_HEADER,
                    626:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    627:                        return;
                    628:                }
1.9       itojun    629: #ifndef PULLDOWN_TEST
                    630:                /* ip6_hopopts_input() ensures that mbuf is contiguous */
                    631:                hbh = (struct ip6_hbh *)(ip6 + 1);
                    632: #else
                    633:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    634:                        sizeof(struct ip6_hbh));
                    635:                if (hbh == NULL) {
                    636:                        ip6stat.ip6s_tooshort++;
                    637:                        return;
                    638:                }
                    639: #endif
                    640:                nxt = hbh->ip6h_nxt;
1.2       itojun    641:
                    642:                /*
                    643:                 * accept the packet if a router alert option is included
                    644:                 * and we act as an IPv6 router.
                    645:                 */
1.5       itojun    646:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    647:                        ours = 1;
                    648:        } else
                    649:                nxt = ip6->ip6_nxt;
                    650:
                    651:        /*
                    652:         * Check that the amount of data in the buffers
                    653:         * is as at least much as the IPv6 header would have us expect.
                    654:         * Trim mbufs if longer than we expect.
                    655:         * Drop packet if shorter than we expect.
                    656:         */
                    657:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    658:                ip6stat.ip6s_tooshort++;
1.9       itojun    659:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    660:                goto bad;
                    661:        }
                    662:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    663:                if (m->m_len == m->m_pkthdr.len) {
                    664:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    665:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    666:                } else
                    667:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    668:        }
                    669:
                    670:        /*
                    671:         * Forward if desirable.
                    672:         */
                    673:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    674:                /*
                    675:                 * If we are acting as a multicast router, all
                    676:                 * incoming multicast packets are passed to the
                    677:                 * kernel-level multicast forwarding function.
                    678:                 * The packet is returned (relatively) intact; if
                    679:                 * ip6_mforward() returns a non-zero value, the packet
                    680:                 * must be discarded, else it may be accepted below.
                    681:                 */
                    682:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    683:                        ip6stat.ip6s_cantforward++;
                    684:                        m_freem(m);
                    685:                        return;
                    686:                }
                    687:                if (!ours) {
                    688:                        m_freem(m);
                    689:                        return;
                    690:                }
1.22      itojun    691:        } else if (!ours) {
1.2       itojun    692:                ip6_forward(m, 0);
                    693:                return;
                    694:        }
1.25      itojun    695:
                    696:        ip6 = mtod(m, struct ip6_hdr *);
                    697:
                    698:        /*
                    699:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    700:         * tcp/udp stack and bypass security checks (act as if it was from
                    701:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    702:         *
                    703:         * For SIIT end node behavior, you may want to disable the check.
                    704:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    705:         * source.
                    706:         */
                    707:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    708:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    709:                ip6stat.ip6s_badscope++;
                    710:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    711:                goto bad;
                    712:        }
1.2       itojun    713:
                    714:        /*
                    715:         * Tell launch routine the next header
                    716:         */
1.12      itojun    717: #ifdef IFA_STATS
1.28      itojun    718:        if (deliverifp != NULL) {
1.9       itojun    719:                struct in6_ifaddr *ia6;
                    720:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    721:                if (ia6)
                    722:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    723:        }
                    724: #endif
1.2       itojun    725:        ip6stat.ip6s_delivered++;
1.9       itojun    726:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    727:        nest = 0;
1.37.2.3  nathanw   728:
1.2       itojun    729:        while (nxt != IPPROTO_DONE) {
                    730:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    731:                        ip6stat.ip6s_toomanyhdr++;
                    732:                        goto bad;
                    733:                }
1.8       itojun    734:
                    735:                /*
                    736:                 * protection against faulty packet - there should be
                    737:                 * more sanity checks in header chain processing.
                    738:                 */
                    739:                if (m->m_pkthdr.len < off) {
                    740:                        ip6stat.ip6s_tooshort++;
1.9       itojun    741:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    742:                        goto bad;
                    743:                }
                    744:
1.37      itojun    745: #ifdef IPSEC
                    746:                /*
                    747:                 * enforce IPsec policy checking if we are seeing last header.
                    748:                 * note that we do not visit this with protocols with pcb layer
                    749:                 * code - like udp/tcp/raw ip.
                    750:                 */
                    751:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    752:                    ipsec6_in_reject(m, NULL)) {
                    753:                        ipsec6stat.in_polvio++;
                    754:                        goto bad;
                    755:                }
                    756: #endif
                    757:
1.2       itojun    758:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    759:        }
                    760:        return;
                    761:  bad:
                    762:        m_freem(m);
                    763: }
                    764:
                    765: /*
                    766:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    767:  * included, the real payload length will be stored in plenp.
                    768:  */
                    769: static int
                    770: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    771:        u_int32_t *plenp;
1.5       itojun    772:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    773:        struct mbuf **mp;
                    774:        int *offp;
                    775: {
1.35      itojun    776:        struct mbuf *m = *mp;
1.2       itojun    777:        int off = *offp, hbhlen;
                    778:        struct ip6_hbh *hbh;
                    779:        u_int8_t *opt;
                    780:
                    781:        /* validation of the length of the header */
1.9       itojun    782: #ifndef PULLDOWN_TEST
1.2       itojun    783:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
                    784:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    785:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    786:
                    787:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
                    788:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9       itojun    789: #else
                    790:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    791:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    792:        if (hbh == NULL) {
                    793:                ip6stat.ip6s_tooshort++;
                    794:                return -1;
                    795:        }
                    796:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    797:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    798:                hbhlen);
                    799:        if (hbh == NULL) {
                    800:                ip6stat.ip6s_tooshort++;
                    801:                return -1;
                    802:        }
                    803: #endif
1.2       itojun    804:        off += hbhlen;
                    805:        hbhlen -= sizeof(struct ip6_hbh);
                    806:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    807:
                    808:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    809:                                hbhlen, rtalertp, plenp) < 0)
                    810:                return(-1);
                    811:
                    812:        *offp = off;
                    813:        *mp = m;
                    814:        return(0);
                    815: }
                    816:
                    817: /*
                    818:  * Search header for all Hop-by-hop options and process each option.
                    819:  * This function is separate from ip6_hopopts_input() in order to
                    820:  * handle a case where the sending node itself process its hop-by-hop
                    821:  * options header. In such a case, the function is called from ip6_output().
                    822:  */
                    823: int
                    824: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    825:        struct mbuf *m;
                    826:        u_int8_t *opthead;
                    827:        int hbhlen;
1.5       itojun    828:        u_int32_t *rtalertp;
1.2       itojun    829:        u_int32_t *plenp;
                    830: {
                    831:        struct ip6_hdr *ip6;
                    832:        int optlen = 0;
                    833:        u_int8_t *opt = opthead;
                    834:        u_int16_t rtalert_val;
1.22      itojun    835:        u_int32_t jumboplen;
1.2       itojun    836:
                    837:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    838:                switch (*opt) {
                    839:                case IP6OPT_PAD1:
                    840:                        optlen = 1;
                    841:                        break;
                    842:                case IP6OPT_PADN:
                    843:                        if (hbhlen < IP6OPT_MINLEN) {
                    844:                                ip6stat.ip6s_toosmall++;
                    845:                                goto bad;
                    846:                        }
                    847:                        optlen = *(opt + 1) + 2;
                    848:                        break;
                    849:                case IP6OPT_RTALERT:
                    850:                        /* XXX may need check for alignment */
                    851:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    852:                                ip6stat.ip6s_toosmall++;
                    853:                                goto bad;
                    854:                        }
                    855:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
                    856:                                 /* XXX: should we discard the packet? */
                    857:                                log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
                    858:                                    *(opt + 1));
                    859:                        }
                    860:                        optlen = IP6OPT_RTALERT_LEN;
                    861:                        bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    862:                        *rtalertp = ntohs(rtalert_val);
                    863:                        break;
                    864:                case IP6OPT_JUMBO:
1.22      itojun    865:                        /* XXX may need check for alignment */
                    866:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    867:                                ip6stat.ip6s_toosmall++;
                    868:                                goto bad;
                    869:                        }
1.35      itojun    870:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
                    871:                                /* XXX: should we discard the packet? */
1.22      itojun    872:                                log(LOG_ERR, "length of jumbopayload opt "
1.27      itojun    873:                                    "is inconsistent(%d)\n",
1.22      itojun    874:                                    *(opt + 1));
1.35      itojun    875:                        }
1.22      itojun    876:                        optlen = IP6OPT_JUMBO_LEN;
                    877:
                    878:                        /*
                    879:                         * IPv6 packets that have non 0 payload length
1.35      itojun    880:                         * must not contain a jumbo payload option.
1.22      itojun    881:                         */
                    882:                        ip6 = mtod(m, struct ip6_hdr *);
                    883:                        if (ip6->ip6_plen) {
                    884:                                ip6stat.ip6s_badoptions++;
                    885:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    886:                                            ICMP6_PARAMPROB_HEADER,
                    887:                                            sizeof(struct ip6_hdr) +
                    888:                                            sizeof(struct ip6_hbh) +
                    889:                                            opt - opthead);
                    890:                                return(-1);
                    891:                        }
1.2       itojun    892:
1.22      itojun    893:                        /*
                    894:                         * We may see jumbolen in unaligned location, so
                    895:                         * we'd need to perform bcopy().
                    896:                         */
                    897:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    898:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    899:
                    900: #if 1
                    901:                        /*
                    902:                         * if there are multiple jumbo payload options,
                    903:                         * *plenp will be non-zero and the packet will be
                    904:                         * rejected.
                    905:                         * the behavior may need some debate in ipngwg -
                    906:                         * multiple options does not make sense, however,
                    907:                         * there's no explicit mention in specification.
                    908:                         */
                    909:                        if (*plenp != 0) {
                    910:                                ip6stat.ip6s_badoptions++;
                    911:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    912:                                            ICMP6_PARAMPROB_HEADER,
                    913:                                            sizeof(struct ip6_hdr) +
                    914:                                            sizeof(struct ip6_hbh) +
                    915:                                            opt + 2 - opthead);
                    916:                                return(-1);
                    917:                        }
1.8       itojun    918: #endif
1.2       itojun    919:
1.22      itojun    920:                        /*
                    921:                         * jumbo payload length must be larger than 65535.
                    922:                         */
                    923:                        if (jumboplen <= IPV6_MAXPACKET) {
                    924:                                ip6stat.ip6s_badoptions++;
                    925:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    926:                                            ICMP6_PARAMPROB_HEADER,
                    927:                                            sizeof(struct ip6_hdr) +
                    928:                                            sizeof(struct ip6_hbh) +
                    929:                                            opt + 2 - opthead);
                    930:                                return(-1);
                    931:                        }
                    932:                        *plenp = jumboplen;
                    933:
                    934:                        break;
1.35      itojun    935:                default:                /* unknown option */
                    936:                        if (hbhlen < IP6OPT_MINLEN) {
                    937:                                ip6stat.ip6s_toosmall++;
                    938:                                goto bad;
                    939:                        }
                    940:                        if ((optlen = ip6_unknown_opt(opt, m,
                    941:                                                      sizeof(struct ip6_hdr) +
                    942:                                                      sizeof(struct ip6_hbh) +
                    943:                                                      opt - opthead)) == -1)
                    944:                                return(-1);
                    945:                        optlen += 2;
                    946:                        break;
1.2       itojun    947:                }
                    948:        }
                    949:
                    950:        return(0);
                    951:
                    952:   bad:
                    953:        m_freem(m);
                    954:        return(-1);
                    955: }
                    956:
                    957: /*
                    958:  * Unknown option processing.
                    959:  * The third argument `off' is the offset from the IPv6 header to the option,
                    960:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    961:  * is not continuous in order to return an ICMPv6 error.
                    962:  */
                    963: int
                    964: ip6_unknown_opt(optp, m, off)
                    965:        u_int8_t *optp;
                    966:        struct mbuf *m;
                    967:        int off;
                    968: {
                    969:        struct ip6_hdr *ip6;
                    970:
1.35      itojun    971:        switch (IP6OPT_TYPE(*optp)) {
                    972:        case IP6OPT_TYPE_SKIP: /* ignore the option */
                    973:                return((int)*(optp + 1));
                    974:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                    975:                m_freem(m);
                    976:                return(-1);
                    977:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    978:                ip6stat.ip6s_badoptions++;
                    979:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
                    980:                return(-1);
                    981:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    982:                ip6stat.ip6s_badoptions++;
                    983:                ip6 = mtod(m, struct ip6_hdr *);
                    984:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    985:                    (m->m_flags & (M_BCAST|M_MCAST)))
                    986:                        m_freem(m);
                    987:                else
                    988:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    989:                                    ICMP6_PARAMPROB_OPTION, off);
                    990:                return(-1);
1.2       itojun    991:        }
                    992:
                    993:        m_freem(m);             /* XXX: NOTREACHED */
                    994:        return(-1);
                    995: }
                    996:
                    997: /*
1.9       itojun    998:  * Create the "control" list for this pcb.
                    999:  *
                   1000:  * The routine will be called from upper layer handlers like tcp6_input().
                   1001:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1002:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1003:  * very first mbuf on the mbuf chain.
                   1004:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1005:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1006:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1007:  */
                   1008: void
                   1009: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun   1010:        struct in6pcb *in6p;
                   1011:        struct mbuf **mp;
                   1012:        struct ip6_hdr *ip6;
                   1013:        struct mbuf *m;
1.2       itojun   1014: {
1.37.2.2  nathanw  1015:        struct proc *p = (curproc ? curproc->l_proc : 0);       /* XXX */
1.9       itojun   1016:        int privileged;
1.2       itojun   1017:
1.9       itojun   1018:        privileged = 0;
                   1019:        if (p && !suser(p->p_ucred, &p->p_acflag))
                   1020:                privileged++;
                   1021:
                   1022: #ifdef SO_TIMESTAMP
1.2       itojun   1023:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1024:                struct timeval tv;
                   1025:
                   1026:                microtime(&tv);
                   1027:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1028:                        SCM_TIMESTAMP, SOL_SOCKET);
                   1029:                if (*mp)
                   1030:                        mp = &(*mp)->m_next;
                   1031:        }
1.9       itojun   1032: #endif
1.2       itojun   1033:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                   1034:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
                   1035:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
                   1036:                        IPPROTO_IPV6);
                   1037:                if (*mp)
                   1038:                        mp = &(*mp)->m_next;
                   1039:        }
                   1040:
                   1041: #ifdef noyet
                   1042:        /* options were tossed above */
                   1043:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                   1044:                /* broken */
                   1045:        /* ip6_srcroute doesn't do what we want here, need to fix */
                   1046:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                   1047:                /* broken */
                   1048: #endif
                   1049:
                   1050:        /* RFC 2292 sec. 5 */
1.35      itojun   1051:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1052:                struct in6_pktinfo pi6;
                   1053:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                   1054:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                   1055:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                   1056:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                   1057:                                        ? m->m_pkthdr.rcvif->if_index
                   1058:                                        : 0;
                   1059:                *mp = sbcreatecontrol((caddr_t) &pi6,
                   1060:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
                   1061:                        IPPROTO_IPV6);
                   1062:                if (*mp)
                   1063:                        mp = &(*mp)->m_next;
                   1064:        }
                   1065:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1066:                int hlim = ip6->ip6_hlim & 0xff;
                   1067:                *mp = sbcreatecontrol((caddr_t) &hlim,
                   1068:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
                   1069:                if (*mp)
                   1070:                        mp = &(*mp)->m_next;
                   1071:        }
                   1072:        /* IN6P_NEXTHOP - for outgoing packet only */
                   1073:
                   1074:        /*
                   1075:         * IPV6_HOPOPTS socket option. We require super-user privilege
                   1076:         * for the option, but it might be too strict, since there might
                   1077:         * be some hop-by-hop options which can be returned to normal user.
                   1078:         * See RFC 2292 section 6.
                   1079:         */
1.35      itojun   1080:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2       itojun   1081:                /*
                   1082:                 * Check if a hop-by-hop options header is contatined in the
                   1083:                 * received packet, and if so, store the options as ancillary
                   1084:                 * data. Note that a hop-by-hop options header must be
                   1085:                 * just after the IPv6 header, which fact is assured through
                   1086:                 * the IPv6 input processing.
                   1087:                 */
                   1088:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1089:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1090:                        struct ip6_hbh *hbh;
                   1091:                        int hbhlen;
                   1092:
                   1093: #ifndef PULLDOWN_TEST
                   1094:                        hbh = (struct ip6_hbh *)(ip6 + 1);
                   1095:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1096: #else
                   1097:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1098:                                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                   1099:                        if (hbh == NULL) {
                   1100:                                ip6stat.ip6s_tooshort++;
                   1101:                                return;
                   1102:                        }
                   1103:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1104:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1105:                                sizeof(struct ip6_hdr), hbhlen);
                   1106:                        if (hbh == NULL) {
                   1107:                                ip6stat.ip6s_tooshort++;
                   1108:                                return;
                   1109:                        }
                   1110: #endif
1.2       itojun   1111:
                   1112:                        /*
                   1113:                         * XXX: We copy whole the header even if a jumbo
                   1114:                         * payload option is included, which option is to
                   1115:                         * be removed before returning in the RFC 2292.
                   1116:                         * But it's too painful operation...
                   1117:                         */
1.9       itojun   1118:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2       itojun   1119:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
                   1120:                        if (*mp)
                   1121:                                mp = &(*mp)->m_next;
                   1122:                }
                   1123:        }
                   1124:
                   1125:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1126:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1127:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1128:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
                   1129:
                   1130:                /*
                   1131:                 * Search for destination options headers or routing
                   1132:                 * header(s) through the header chain, and stores each
                   1133:                 * header as ancillary data.
                   1134:                 * Note that the order of the headers remains in
                   1135:                 * the chain of ancillary data.
                   1136:                 */
1.35      itojun   1137:                while (1) {     /* is explicit loop prevention necessary? */
1.9       itojun   1138:                        struct ip6_ext *ip6e;
                   1139:                        int elen;
                   1140:
                   1141: #ifndef PULLDOWN_TEST
                   1142:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
                   1143:                        if (nxt == IPPROTO_AH)
                   1144:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1145:                        else
                   1146:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1147: #else
                   1148:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
                   1149:                                sizeof(struct ip6_ext));
                   1150:                        if (ip6e == NULL) {
                   1151:                                ip6stat.ip6s_tooshort++;
                   1152:                                return;
                   1153:                        }
                   1154:                        if (nxt == IPPROTO_AH)
                   1155:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1156:                        else
                   1157:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1158:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
                   1159:                        if (ip6e == NULL) {
                   1160:                                ip6stat.ip6s_tooshort++;
                   1161:                                return;
                   1162:                        }
                   1163: #endif
1.2       itojun   1164:
1.35      itojun   1165:                        switch (nxt) {
                   1166:                        case IPPROTO_DSTOPTS:
                   1167:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1168:                                        break;
                   1169:
                   1170:                                /*
                   1171:                                 * We also require super-user privilege for
                   1172:                                 * the option.
                   1173:                                 * See the comments on IN6_HOPOPTS.
                   1174:                                 */
                   1175:                                if (!privileged)
                   1176:                                        break;
                   1177:
                   1178:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1179:                                                      IPV6_DSTOPTS,
                   1180:                                                      IPPROTO_IPV6);
                   1181:                                if (*mp)
                   1182:                                        mp = &(*mp)->m_next;
                   1183:                                break;
                   1184:
                   1185:                        case IPPROTO_ROUTING:
                   1186:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1187:                                        break;
                   1188:
                   1189:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1190:                                                      IPV6_RTHDR,
                   1191:                                                      IPPROTO_IPV6);
                   1192:                                if (*mp)
                   1193:                                        mp = &(*mp)->m_next;
                   1194:                                break;
                   1195:
                   1196:                        case IPPROTO_UDP:
                   1197:                        case IPPROTO_TCP:
                   1198:                        case IPPROTO_ICMPV6:
                   1199:                        default:
                   1200:                                /*
                   1201:                                 * stop search if we encounter an upper
                   1202:                                 * layer protocol headers.
                   1203:                                 */
                   1204:                                goto loopend;
                   1205:
                   1206:                        case IPPROTO_HOPOPTS:
                   1207:                        case IPPROTO_AH: /* is it possible? */
                   1208:                                break;
1.2       itojun   1209:                        }
                   1210:
                   1211:                        /* proceed with the next header. */
1.9       itojun   1212:                        off += elen;
1.2       itojun   1213:                        nxt = ip6e->ip6e_nxt;
                   1214:                }
                   1215:          loopend:
1.36      cgd      1216:                ;
1.2       itojun   1217:        }
1.9       itojun   1218:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun   1219:                /* to be done */
                   1220:        }
1.9       itojun   1221:        if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2       itojun   1222:                /* to be done */
                   1223:        }
                   1224:        /* IN6P_RTHDR - to be done */
                   1225:
                   1226: }
                   1227:
                   1228: /*
                   1229:  * Get pointer to the previous header followed by the header
                   1230:  * currently processed.
                   1231:  * XXX: This function supposes that
                   1232:  *     M includes all headers,
                   1233:  *     the next header field and the header length field of each header
                   1234:  *     are valid, and
                   1235:  *     the sum of each header length equals to OFF.
                   1236:  * Because of these assumptions, this function must be called very
                   1237:  * carefully. Moreover, it will not be used in the near future when
                   1238:  * we develop `neater' mechanism to process extension headers.
                   1239:  */
                   1240: char *
                   1241: ip6_get_prevhdr(m, off)
                   1242:        struct mbuf *m;
                   1243:        int off;
                   1244: {
                   1245:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1246:
                   1247:        if (off == sizeof(struct ip6_hdr))
                   1248:                return(&ip6->ip6_nxt);
                   1249:        else {
                   1250:                int len, nxt;
                   1251:                struct ip6_ext *ip6e = NULL;
                   1252:
                   1253:                nxt = ip6->ip6_nxt;
                   1254:                len = sizeof(struct ip6_hdr);
                   1255:                while (len < off) {
                   1256:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1257:
1.35      itojun   1258:                        switch (nxt) {
1.2       itojun   1259:                        case IPPROTO_FRAGMENT:
                   1260:                                len += sizeof(struct ip6_frag);
                   1261:                                break;
                   1262:                        case IPPROTO_AH:
                   1263:                                len += (ip6e->ip6e_len + 2) << 2;
                   1264:                                break;
                   1265:                        default:
                   1266:                                len += (ip6e->ip6e_len + 1) << 3;
                   1267:                                break;
                   1268:                        }
                   1269:                        nxt = ip6e->ip6e_nxt;
                   1270:                }
                   1271:                if (ip6e)
                   1272:                        return(&ip6e->ip6e_nxt);
                   1273:                else
                   1274:                        return NULL;
1.18      itojun   1275:        }
                   1276: }
                   1277:
                   1278: /*
                   1279:  * get next header offset.  m will be retained.
                   1280:  */
                   1281: int
                   1282: ip6_nexthdr(m, off, proto, nxtp)
                   1283:        struct mbuf *m;
                   1284:        int off;
                   1285:        int proto;
                   1286:        int *nxtp;
                   1287: {
                   1288:        struct ip6_hdr ip6;
                   1289:        struct ip6_ext ip6e;
                   1290:        struct ip6_frag fh;
                   1291:
                   1292:        /* just in case */
                   1293:        if (m == NULL)
                   1294:                panic("ip6_nexthdr: m == NULL");
                   1295:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1296:                return -1;
                   1297:
                   1298:        switch (proto) {
                   1299:        case IPPROTO_IPV6:
                   1300:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1301:                        return -1;
                   1302:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1303:                if (nxtp)
                   1304:                        *nxtp = ip6.ip6_nxt;
                   1305:                off += sizeof(ip6);
                   1306:                return off;
                   1307:
                   1308:        case IPPROTO_FRAGMENT:
                   1309:                /*
                   1310:                 * terminate parsing if it is not the first fragment,
                   1311:                 * it does not make sense to parse through it.
                   1312:                 */
                   1313:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1314:                        return -1;
                   1315:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
                   1316:                if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
                   1317:                        return -1;
                   1318:                if (nxtp)
                   1319:                        *nxtp = fh.ip6f_nxt;
                   1320:                off += sizeof(struct ip6_frag);
                   1321:                return off;
                   1322:
                   1323:        case IPPROTO_AH:
                   1324:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1325:                        return -1;
                   1326:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1327:                if (nxtp)
                   1328:                        *nxtp = ip6e.ip6e_nxt;
                   1329:                off += (ip6e.ip6e_len + 2) << 2;
1.37.2.7  nathanw  1330:                if (m->m_pkthdr.len < off)
                   1331:                        return -1;
1.18      itojun   1332:                return off;
                   1333:
                   1334:        case IPPROTO_HOPOPTS:
                   1335:        case IPPROTO_ROUTING:
                   1336:        case IPPROTO_DSTOPTS:
                   1337:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1338:                        return -1;
                   1339:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1340:                if (nxtp)
                   1341:                        *nxtp = ip6e.ip6e_nxt;
                   1342:                off += (ip6e.ip6e_len + 1) << 3;
1.37.2.7  nathanw  1343:                if (m->m_pkthdr.len < off)
                   1344:                        return -1;
1.18      itojun   1345:                return off;
                   1346:
                   1347:        case IPPROTO_NONE:
                   1348:        case IPPROTO_ESP:
                   1349:        case IPPROTO_IPCOMP:
                   1350:                /* give up */
                   1351:                return -1;
                   1352:
                   1353:        default:
                   1354:                return -1;
                   1355:        }
                   1356:
                   1357:        return -1;
                   1358: }
                   1359:
                   1360: /*
                   1361:  * get offset for the last header in the chain.  m will be kept untainted.
                   1362:  */
                   1363: int
                   1364: ip6_lasthdr(m, off, proto, nxtp)
                   1365:        struct mbuf *m;
                   1366:        int off;
                   1367:        int proto;
                   1368:        int *nxtp;
                   1369: {
                   1370:        int newoff;
                   1371:        int nxt;
                   1372:
                   1373:        if (!nxtp) {
                   1374:                nxt = -1;
                   1375:                nxtp = &nxt;
                   1376:        }
                   1377:        while (1) {
                   1378:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1379:                if (newoff < 0)
                   1380:                        return off;
                   1381:                else if (newoff < off)
                   1382:                        return -1;      /* invalid */
                   1383:                else if (newoff == off)
                   1384:                        return newoff;
                   1385:
                   1386:                off = newoff;
                   1387:                proto = *nxtp;
1.2       itojun   1388:        }
                   1389: }
                   1390:
                   1391: /*
                   1392:  * System control for IP6
                   1393:  */
                   1394:
                   1395: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1396:        0,              0,              0,              0,
                   1397:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1398:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1399:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1400:        0,              0,              0,              0,
                   1401:        ENOPROTOOPT
                   1402: };
                   1403:
                   1404: int
                   1405: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1406:        int *name;
                   1407:        u_int namelen;
                   1408:        void *oldp;
                   1409:        size_t *oldlenp;
                   1410:        void *newp;
                   1411:        size_t newlen;
                   1412: {
1.26      itojun   1413:        int old, error;
                   1414:
1.2       itojun   1415:        /* All sysctl names at this level are terminal. */
                   1416:        if (namelen != 1)
                   1417:                return ENOTDIR;
                   1418:
                   1419:        switch (name[0]) {
                   1420:
                   1421:        case IPV6CTL_FORWARDING:
                   1422:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1423:                                  &ip6_forwarding);
                   1424:        case IPV6CTL_SENDREDIRECTS:
                   1425:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1426:                                &ip6_sendredirects);
                   1427:        case IPV6CTL_DEFHLIM:
                   1428:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                   1429:        case IPV6CTL_MAXFRAGPACKETS:
                   1430:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1431:                                &ip6_maxfragpackets);
                   1432:        case IPV6CTL_ACCEPT_RTADV:
                   1433:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1434:                                &ip6_accept_rtadv);
                   1435:        case IPV6CTL_KEEPFAITH:
                   1436:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                   1437:        case IPV6CTL_LOG_INTERVAL:
                   1438:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1439:                                &ip6_log_interval);
                   1440:        case IPV6CTL_HDRNESTLIMIT:
                   1441:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1442:                                &ip6_hdrnestlimit);
                   1443:        case IPV6CTL_DAD_COUNT:
                   1444:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1445:        case IPV6CTL_AUTO_FLOWLABEL:
                   1446:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1447:                                &ip6_auto_flowlabel);
                   1448:        case IPV6CTL_DEFMCASTHLIM:
                   1449:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1450:                                &ip6_defmcasthlim);
1.37.2.8! nathanw  1451: #if NGIF > 0
1.2       itojun   1452:        case IPV6CTL_GIF_HLIM:
                   1453:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1454:                                &ip6_gif_hlim);
1.37.2.8! nathanw  1455: #endif
1.2       itojun   1456:        case IPV6CTL_KAME_VERSION:
                   1457:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9       itojun   1458:        case IPV6CTL_USE_DEPRECATED:
                   1459:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1460:                                &ip6_use_deprecated);
1.10      itojun   1461:        case IPV6CTL_RR_PRUNE:
                   1462:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.37.2.6  nathanw  1463:        case IPV6CTL_V6ONLY:
                   1464: #ifdef INET6_BINDV6ONLY
                   1465:                return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
                   1466: #else
                   1467:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26      itojun   1468: #endif
                   1469:        case IPV6CTL_ANONPORTMIN:
                   1470:                old = ip6_anonportmin;
                   1471:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1472:                    &ip6_anonportmin);
                   1473:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
                   1474:                    ip6_anonportmin > 65535
                   1475: #ifndef IPNOPRIVPORTS
                   1476:                    || ip6_anonportmin < IPV6PORT_RESERVED
                   1477: #endif
                   1478:                    ) {
                   1479:                        ip6_anonportmin = old;
                   1480:                        return (EINVAL);
                   1481:                }
                   1482:                return (error);
                   1483:        case IPV6CTL_ANONPORTMAX:
                   1484:                old = ip6_anonportmax;
                   1485:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1486:                    &ip6_anonportmax);
                   1487:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
                   1488:                    ip6_anonportmax > 65535
                   1489: #ifndef IPNOPRIVPORTS
                   1490:                    || ip6_anonportmax < IPV6PORT_RESERVED
                   1491: #endif
                   1492:                    ) {
                   1493:                        ip6_anonportmax = old;
                   1494:                        return (EINVAL);
                   1495:                }
                   1496:                return (error);
                   1497: #ifndef IPNOPRIVPORTS
                   1498:        case IPV6CTL_LOWPORTMIN:
                   1499:                old = ip6_lowportmin;
                   1500:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1501:                    &ip6_lowportmin);
                   1502:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1503:                    ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
                   1504:                    ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
                   1505:                        ip6_lowportmin = old;
                   1506:                        return (EINVAL);
                   1507:                }
                   1508:                return (error);
                   1509:        case IPV6CTL_LOWPORTMAX:
                   1510:                old = ip6_lowportmax;
                   1511:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1512:                    &ip6_lowportmax);
                   1513:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1514:                    ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
                   1515:                    ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
                   1516:                        ip6_lowportmax = old;
                   1517:                        return (EINVAL);
                   1518:                }
                   1519:                return (error);
1.11      itojun   1520: #endif
1.2       itojun   1521:        default:
                   1522:                return EOPNOTSUPP;
                   1523:        }
                   1524:        /* NOTREACHED */
                   1525: }

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