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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.37.2.11

1.37.2.11! nathanw     1: /*     $NetBSD: ip6_input.c,v 1.37.2.10 2002/06/24 22:11:50 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>
1.37.2.11! nathanw    69: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.37.2.10 2002/06/24 22:11:50 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>
                     87: #include <sys/proc.h>
1.37.2.7  nathanw    88: #include <sys/sysctl.h>
1.2       itojun     89:
                     90: #include <net/if.h>
                     91: #include <net/if_types.h>
                     92: #include <net/if_dl.h>
                     93: #include <net/route.h>
                     94: #include <net/netisr.h>
1.15      darrenr    95: #ifdef PFIL_HOOKS
                     96: #include <net/pfil.h>
                     97: #endif
1.2       itojun     98:
                     99: #include <netinet/in.h>
1.9       itojun    100: #include <netinet/in_systm.h>
                    101: #ifdef INET
                    102: #include <netinet/ip.h>
                    103: #include <netinet/ip_icmp.h>
1.37.2.7  nathanw   104: #endif /* INET */
1.14      itojun    105: #include <netinet/ip6.h>
1.2       itojun    106: #include <netinet6/in6_var.h>
1.11      itojun    107: #include <netinet6/ip6_var.h>
1.2       itojun    108: #include <netinet6/in6_pcb.h>
1.14      itojun    109: #include <netinet/icmp6.h>
1.2       itojun    110: #include <netinet6/in6_ifattach.h>
                    111: #include <netinet6/nd6.h>
                    112:
1.37      itojun    113: #ifdef IPSEC
                    114: #include <netinet6/ipsec.h>
                    115: #endif
                    116:
1.2       itojun    117: #include <netinet6/ip6protosw.h>
                    118:
                    119: /* we need it for NLOOP. */
                    120: #include "loop.h"
                    121: #include "faith.h"
                    122: #include "gif.h"
                    123: #include "bpfilter.h"
                    124:
1.37.2.8  nathanw   125: #if NGIF > 0
                    126: #include <netinet6/in6_gif.h>
                    127: #endif
                    128:
1.9       itojun    129: #include <net/net_osdep.h>
                    130:
1.2       itojun    131: extern struct domain inet6domain;
                    132:
                    133: u_char ip6_protox[IPPROTO_MAX];
                    134: static int ip6qmaxlen = IFQ_MAXLEN;
                    135: struct in6_ifaddr *in6_ifaddr;
                    136: struct ifqueue ip6intrq;
                    137:
                    138: extern struct ifnet loif[NLOOP];
                    139: int ip6_forward_srcrt;                 /* XXX */
                    140: int ip6_sourcecheck;                   /* XXX */
                    141: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    142:
1.29      thorpej   143: #ifdef PFIL_HOOKS
                    144: struct pfil_head inet6_pfil_hook;
                    145: #endif
                    146:
1.2       itojun    147: struct ip6stat ip6stat;
                    148:
                    149: static void ip6_init2 __P((void *));
                    150:
1.5       itojun    151: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2       itojun    152:
                    153: /*
                    154:  * IP6 initialization: fill in IP6 protocol switch table.
                    155:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    156:  */
                    157: void
                    158: ip6_init()
                    159: {
1.35      itojun    160:        struct ip6protosw *pr;
                    161:        int i;
1.2       itojun    162:
                    163:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    164:        if (pr == 0)
                    165:                panic("ip6_init");
                    166:        for (i = 0; i < IPPROTO_MAX; i++)
                    167:                ip6_protox[i] = pr - inet6sw;
                    168:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    169:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    170:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    171:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    172:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    173:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    174:        nd6_init();
                    175:        frag6_init();
1.37.2.9  nathanw   176:        ip6_flow_seq = arc4random();
1.2       itojun    177:
                    178:        ip6_init2((void *)0);
1.29      thorpej   179:
                    180: #ifdef PFIL_HOOKS
                    181:        /* Register our Packet Filter hook. */
1.33      thorpej   182:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    183:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   184:        i = pfil_head_register(&inet6_pfil_hook);
                    185:        if (i != 0)
                    186:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    187:                    "error %d\n", i);
                    188: #endif /* PFIL_HOOKS */
1.2       itojun    189: }
                    190:
                    191: static void
                    192: ip6_init2(dummy)
                    193:        void *dummy;
                    194: {
                    195:
                    196:        /* nd6_timer_init */
1.19      thorpej   197:        callout_init(&nd6_timer_ch);
                    198:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.2       itojun    199: }
                    200:
                    201: /*
                    202:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    203:  */
                    204: void
                    205: ip6intr()
                    206: {
                    207:        int s;
                    208:        struct mbuf *m;
                    209:
                    210:        for (;;) {
1.37.2.4  nathanw   211:                s = splnet();
1.2       itojun    212:                IF_DEQUEUE(&ip6intrq, m);
                    213:                splx(s);
                    214:                if (m == 0)
                    215:                        return;
                    216:                ip6_input(m);
                    217:        }
                    218: }
                    219:
                    220: extern struct  route_in6 ip6_forward_rt;
                    221:
                    222: void
                    223: ip6_input(m)
                    224:        struct mbuf *m;
                    225: {
1.9       itojun    226:        struct ip6_hdr *ip6;
1.2       itojun    227:        int off = sizeof(struct ip6_hdr), nest;
                    228:        u_int32_t plen;
1.5       itojun    229:        u_int32_t rtalert = ~0;
1.2       itojun    230:        int nxt, ours = 0;
1.9       itojun    231:        struct ifnet *deliverifp = NULL;
1.2       itojun    232:
                    233: #ifdef IPSEC
                    234:        /*
                    235:         * should the inner packet be considered authentic?
                    236:         * see comment in ah4_input().
                    237:         */
1.37.2.8  nathanw   238:        m->m_flags &= ~M_AUTHIPHDR;
                    239:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    240: #endif
1.9       itojun    241:
1.2       itojun    242:        /*
1.37.2.6  nathanw   243:         * mbuf statistics
1.2       itojun    244:         */
                    245:        if (m->m_flags & M_EXT) {
                    246:                if (m->m_next)
                    247:                        ip6stat.ip6s_mext2m++;
                    248:                else
                    249:                        ip6stat.ip6s_mext1++;
                    250:        } else {
1.37.2.3  nathanw   251: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2       itojun    252:                if (m->m_next) {
1.9       itojun    253:                        if (m->m_flags & M_LOOP) {
1.37.2.6  nathanw   254:                                ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.37.2.3  nathanw   255:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    256:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    257:                        else
                    258:                                ip6stat.ip6s_m2m[0]++;
                    259:                } else
                    260:                        ip6stat.ip6s_m1++;
1.37.2.3  nathanw   261: #undef M2MMAX
1.2       itojun    262:        }
                    263:
1.9       itojun    264:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    265:        ip6stat.ip6s_total++;
                    266:
                    267: #ifndef PULLDOWN_TEST
                    268:        /* XXX is the line really necessary? */
1.2       itojun    269:        IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9       itojun    270: #endif
1.2       itojun    271:
1.9       itojun    272:        if (m->m_len < sizeof(struct ip6_hdr)) {
                    273:                struct ifnet *inifp;
                    274:                inifp = m->m_pkthdr.rcvif;
1.37.2.9  nathanw   275:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9       itojun    276:                        ip6stat.ip6s_toosmall++;
                    277:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    278:                        return;
                    279:                }
1.2       itojun    280:        }
                    281:
                    282:        ip6 = mtod(m, struct ip6_hdr *);
                    283:
                    284:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    285:                ip6stat.ip6s_badvers++;
1.9       itojun    286:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    287:                goto bad;
                    288:        }
1.15      darrenr   289:
                    290: #ifdef PFIL_HOOKS
                    291:        /*
                    292:         * Run through list of hooks for input packets.  If there are any
                    293:         * filters which require that additional packets in the flow are
                    294:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    295:         * Note that filters must _never_ set this flag, as another filter
                    296:         * in the list may have previously cleared it.
                    297:         */
1.37.2.3  nathanw   298:        /*
                    299:         * let ipfilter look at packet on the wire,
                    300:         * not the decapsulated packet.
                    301:         */
                    302: #ifdef IPSEC
1.37.2.5  nathanw   303:        if (!ipsec_getnhist(m))
1.37.2.3  nathanw   304: #else
                    305:        if (1)
                    306: #endif
                    307:        {
                    308:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    309:                                   PFIL_IN) != 0)
                    310:                        return;
                    311:                if (m == NULL)
                    312:                        return;
                    313:                ip6 = mtod(m, struct ip6_hdr *);
                    314:        }
1.15      darrenr   315: #endif /* PFIL_HOOKS */
                    316:
1.2       itojun    317:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    318:
1.30      thorpej   319: #ifdef ALTQ
                    320:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    321:                /* packet is dropped by traffic conditioner */
                    322:                return;
1.9       itojun    323:        }
                    324: #endif
                    325:
1.2       itojun    326:        /*
1.37.2.6  nathanw   327:         * Check against address spoofing/corruption.
1.2       itojun    328:         */
                    329:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    330:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.37.2.9  nathanw   331:                /*
                    332:                 * XXX: "badscope" is not very suitable for a multicast source.
                    333:                 */
1.2       itojun    334:                ip6stat.ip6s_badscope++;
1.9       itojun    335:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    336:                goto bad;
                    337:        }
1.13      itojun    338:        /*
1.37.2.6  nathanw   339:         * The following check is not documented in specs.  A malicious
                    340:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    341:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    342:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    343:         *
1.37.2.6  nathanw   344:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    345:         * support IPv4-less kernel compilation, we cannot support SIIT
                    346:         * environment at all.  So, it makes more sense for us to reject any
                    347:         * malicious packets for non-SIIT environment, than try to do a
1.37.2.9  nathanw   348:         * partial support for SIIT environment.
1.13      itojun    349:         */
                    350:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    351:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    352:                ip6stat.ip6s_badscope++;
                    353:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    354:                goto bad;
                    355:        }
1.17      itojun    356: #if 0
1.13      itojun    357:        /*
1.17      itojun    358:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    359:         *
                    360:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    361:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    362:         * is revised to forbid relaying case.
1.13      itojun    363:         */
                    364:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    365:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    366:                ip6stat.ip6s_badscope++;
                    367:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    368:                goto bad;
                    369:        }
                    370: #endif
1.35      itojun    371:
1.2       itojun    372:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    373:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    374:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    375:                        ours = 1;
1.9       itojun    376:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    377:                        goto hbhcheck;
                    378:                } else {
                    379:                        ip6stat.ip6s_badscope++;
1.9       itojun    380:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    381:                        goto bad;
                    382:                }
                    383:        }
                    384:
1.37.2.3  nathanw   385:        /* drop packets if interface ID portion is already filled */
                    386:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    387:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
                    388:                    ip6->ip6_src.s6_addr16[1]) {
                    389:                        ip6stat.ip6s_badscope++;
                    390:                        goto bad;
                    391:                }
                    392:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
                    393:                    ip6->ip6_dst.s6_addr16[1]) {
                    394:                        ip6stat.ip6s_badscope++;
                    395:                        goto bad;
                    396:                }
1.2       itojun    397:        }
                    398:
1.37.2.3  nathanw   399:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    400:                ip6->ip6_src.s6_addr16[1]
                    401:                        = htons(m->m_pkthdr.rcvif->if_index);
                    402:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    403:                ip6->ip6_dst.s6_addr16[1]
                    404:                        = htons(m->m_pkthdr.rcvif->if_index);
                    405:
                    406:        /*
                    407:         * We use rt->rt_ifp to determine if the address is ours or not.
                    408:         * If rt_ifp is lo0, the address is ours.
                    409:         * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
                    410:         * so any address under fe80::%lo0/64 will be mistakenly considered
                    411:         * local.  The special case is supplied to handle the case properly
                    412:         * by actually looking at interface addresses
                    413:         * (using in6ifa_ifpwithaddr).
                    414:         */
                    415:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
                    416:            IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    417:                if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
                    418:                        icmp6_error(m, ICMP6_DST_UNREACH,
                    419:                            ICMP6_DST_UNREACH_ADDR, 0);
                    420:                        /* m is already freed */
                    421:                        return;
1.21      itojun    422:                }
1.37.2.3  nathanw   423:
                    424:                ours = 1;
                    425:                deliverifp = m->m_pkthdr.rcvif;
                    426:                goto hbhcheck;
1.9       itojun    427:        }
                    428:
1.2       itojun    429:        /*
                    430:         * Multicast check
                    431:         */
                    432:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    433:                struct  in6_multi *in6m = 0;
1.9       itojun    434:
                    435:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    436:                /*
                    437:                 * See if we belong to the destination multicast group on the
                    438:                 * arrival interface.
                    439:                 */
                    440:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    441:                if (in6m)
                    442:                        ours = 1;
                    443:                else if (!ip6_mrouter) {
                    444:                        ip6stat.ip6s_notmember++;
                    445:                        ip6stat.ip6s_cantforward++;
1.9       itojun    446:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    447:                        goto bad;
                    448:                }
1.9       itojun    449:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    450:                goto hbhcheck;
                    451:        }
                    452:
                    453:        /*
                    454:         *  Unicast check
                    455:         */
1.22      itojun    456:        if (ip6_forward_rt.ro_rt != NULL &&
1.37.2.9  nathanw   457:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
1.22      itojun    458:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.35      itojun    459:                               &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25      itojun    460:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    461:        else {
1.35      itojun    462:                struct sockaddr_in6 *dst6;
                    463:
1.2       itojun    464:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    465:                        /* route is down or destination is different */
1.25      itojun    466:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    467:                        RTFREE(ip6_forward_rt.ro_rt);
                    468:                        ip6_forward_rt.ro_rt = 0;
                    469:                }
1.22      itojun    470:
1.2       itojun    471:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35      itojun    472:                dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
                    473:                dst6->sin6_len = sizeof(struct sockaddr_in6);
                    474:                dst6->sin6_family = AF_INET6;
                    475:                dst6->sin6_addr = ip6->ip6_dst;
1.2       itojun    476:
1.9       itojun    477:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    478:        }
                    479:
                    480: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    481:
                    482:        /*
                    483:         * Accept the packet if the forwarding interface to the destination
                    484:         * according to the routing table is the loopback interface,
                    485:         * unless the associated route has a gateway.
                    486:         * Note that this approach causes to accept a packet if there is a
                    487:         * route to the loopback interface for the destination of the packet.
                    488:         * But we think it's even useful in some situations, e.g. when using
                    489:         * a special daemon which wants to intercept the packet.
                    490:         */
                    491:        if (ip6_forward_rt.ro_rt &&
                    492:            (ip6_forward_rt.ro_rt->rt_flags &
                    493:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.37.2.9  nathanw   494:            !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2       itojun    495: #if 0
                    496:            /*
                    497:             * The check below is redundant since the comparison of
                    498:             * the destination and the key of the rtentry has
                    499:             * already done through looking up the routing table.
                    500:             */
                    501:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.37.2.9  nathanw   502:            &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2       itojun    503: #endif
1.9       itojun    504:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    505:                struct in6_ifaddr *ia6 =
                    506:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    507:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    508:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    509:                /*
                    510:                 * packets to a tentative, duplicated, or somehow invalid
                    511:                 * address must not be accepted.
                    512:                 */
1.2       itojun    513:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    514:                        /* this address is ready */
1.2       itojun    515:                        ours = 1;
1.9       itojun    516:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    517:                        goto hbhcheck;
                    518:                } else {
1.24      itojun    519:                        /* address is not ready, so discard the packet. */
1.34      itojun    520:                        nd6log((LOG_INFO,
1.27      itojun    521:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    522:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    523:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    524:
                    525:                        goto bad;
1.2       itojun    526:                }
                    527:        }
                    528:
                    529:        /*
1.37.2.9  nathanw   530:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    531:         */
                    532: #if defined(NFAITH) && 0 < NFAITH
                    533:        if (ip6_keepfaith) {
                    534:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    535:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    536:                        /* XXX do we need more sanity checks? */
                    537:                        ours = 1;
1.37.2.7  nathanw   538:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9       itojun    539:                        goto hbhcheck;
                    540:                }
                    541:        }
                    542: #endif
                    543:
                    544: #if 0
                    545:     {
                    546:        /*
                    547:         * Last resort: check in6_ifaddr for incoming interface.
                    548:         * The code is here until I update the "goto ours hack" code above
                    549:         * working right.
                    550:         */
                    551:        struct ifaddr *ifa;
                    552:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    553:             ifa;
                    554:             ifa = ifa->ifa_list.tqe_next) {
                    555:                if (ifa->ifa_addr == NULL)
                    556:                        continue;       /* just for safety */
                    557:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    558:                        continue;
                    559:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    560:                        ours = 1;
                    561:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    562:                        goto hbhcheck;
                    563:                }
                    564:        }
1.9       itojun    565:     }
1.2       itojun    566: #endif
                    567:
                    568:        /*
                    569:         * Now there is no reason to process the packet if it's not our own
                    570:         * and we're not a router.
                    571:         */
                    572:        if (!ip6_forwarding) {
                    573:                ip6stat.ip6s_cantforward++;
1.9       itojun    574:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    575:                goto bad;
                    576:        }
                    577:
                    578:   hbhcheck:
                    579:        /*
                    580:         * Process Hop-by-Hop options header if it's contained.
                    581:         * m may be modified in ip6_hopopts_input().
                    582:         * If a JumboPayload option is included, plen will also be modified.
                    583:         */
                    584:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    585:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    586:                struct ip6_hbh *hbh;
                    587:
                    588:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    589: #if 0  /*touches NULL pointer*/
                    590:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    591: #endif
1.2       itojun    592:                        return; /* m have already been freed */
1.9       itojun    593:                }
1.22      itojun    594:
1.2       itojun    595:                /* adjust pointer */
                    596:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    597:
                    598:                /*
1.37.2.8  nathanw   599:                 * if the payload length field is 0 and the next header field
1.22      itojun    600:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    601:                 * option MUST be included.
                    602:                 */
                    603:                if (ip6->ip6_plen == 0 && plen == 0) {
                    604:                        /*
                    605:                         * Note that if a valid jumbo payload option is
                    606:                         * contained, ip6_hoptops_input() must set a valid
1.37.2.9  nathanw   607:                         * (non-zero) payload length to the variable plen.
1.22      itojun    608:                         */
                    609:                        ip6stat.ip6s_badoptions++;
                    610:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    611:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    612:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    613:                                    ICMP6_PARAMPROB_HEADER,
                    614:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    615:                        return;
                    616:                }
1.9       itojun    617: #ifndef PULLDOWN_TEST
                    618:                /* ip6_hopopts_input() ensures that mbuf is contiguous */
                    619:                hbh = (struct ip6_hbh *)(ip6 + 1);
                    620: #else
                    621:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    622:                        sizeof(struct ip6_hbh));
                    623:                if (hbh == NULL) {
                    624:                        ip6stat.ip6s_tooshort++;
                    625:                        return;
                    626:                }
                    627: #endif
                    628:                nxt = hbh->ip6h_nxt;
1.2       itojun    629:
                    630:                /*
                    631:                 * accept the packet if a router alert option is included
                    632:                 * and we act as an IPv6 router.
                    633:                 */
1.5       itojun    634:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    635:                        ours = 1;
                    636:        } else
                    637:                nxt = ip6->ip6_nxt;
                    638:
                    639:        /*
                    640:         * Check that the amount of data in the buffers
                    641:         * is as at least much as the IPv6 header would have us expect.
                    642:         * Trim mbufs if longer than we expect.
                    643:         * Drop packet if shorter than we expect.
                    644:         */
                    645:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    646:                ip6stat.ip6s_tooshort++;
1.9       itojun    647:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    648:                goto bad;
                    649:        }
                    650:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    651:                if (m->m_len == m->m_pkthdr.len) {
                    652:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    653:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    654:                } else
                    655:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    656:        }
                    657:
                    658:        /*
                    659:         * Forward if desirable.
                    660:         */
                    661:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    662:                /*
                    663:                 * If we are acting as a multicast router, all
                    664:                 * incoming multicast packets are passed to the
                    665:                 * kernel-level multicast forwarding function.
                    666:                 * The packet is returned (relatively) intact; if
                    667:                 * ip6_mforward() returns a non-zero value, the packet
                    668:                 * must be discarded, else it may be accepted below.
                    669:                 */
                    670:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    671:                        ip6stat.ip6s_cantforward++;
                    672:                        m_freem(m);
                    673:                        return;
                    674:                }
                    675:                if (!ours) {
                    676:                        m_freem(m);
                    677:                        return;
                    678:                }
1.22      itojun    679:        } else if (!ours) {
1.2       itojun    680:                ip6_forward(m, 0);
                    681:                return;
1.37.2.9  nathanw   682:        }
1.25      itojun    683:
                    684:        ip6 = mtod(m, struct ip6_hdr *);
                    685:
                    686:        /*
                    687:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    688:         * tcp/udp stack and bypass security checks (act as if it was from
                    689:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    690:         *
                    691:         * For SIIT end node behavior, you may want to disable the check.
                    692:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    693:         * source.
                    694:         */
                    695:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    696:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    697:                ip6stat.ip6s_badscope++;
                    698:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    699:                goto bad;
                    700:        }
1.2       itojun    701:
                    702:        /*
                    703:         * Tell launch routine the next header
                    704:         */
1.12      itojun    705: #ifdef IFA_STATS
1.28      itojun    706:        if (deliverifp != NULL) {
1.9       itojun    707:                struct in6_ifaddr *ia6;
                    708:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    709:                if (ia6)
                    710:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    711:        }
                    712: #endif
1.2       itojun    713:        ip6stat.ip6s_delivered++;
1.9       itojun    714:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    715:        nest = 0;
1.37.2.3  nathanw   716:
1.2       itojun    717:        while (nxt != IPPROTO_DONE) {
                    718:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    719:                        ip6stat.ip6s_toomanyhdr++;
                    720:                        goto bad;
                    721:                }
1.8       itojun    722:
                    723:                /*
                    724:                 * protection against faulty packet - there should be
                    725:                 * more sanity checks in header chain processing.
                    726:                 */
                    727:                if (m->m_pkthdr.len < off) {
                    728:                        ip6stat.ip6s_tooshort++;
1.9       itojun    729:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    730:                        goto bad;
                    731:                }
                    732:
1.37      itojun    733: #ifdef IPSEC
                    734:                /*
                    735:                 * enforce IPsec policy checking if we are seeing last header.
                    736:                 * note that we do not visit this with protocols with pcb layer
                    737:                 * code - like udp/tcp/raw ip.
                    738:                 */
                    739:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    740:                    ipsec6_in_reject(m, NULL)) {
                    741:                        ipsec6stat.in_polvio++;
                    742:                        goto bad;
                    743:                }
                    744: #endif
1.37.2.9  nathanw   745:
1.2       itojun    746:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    747:        }
                    748:        return;
                    749:  bad:
                    750:        m_freem(m);
                    751: }
                    752:
                    753: /*
                    754:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    755:  * included, the real payload length will be stored in plenp.
                    756:  */
                    757: static int
                    758: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    759:        u_int32_t *plenp;
1.5       itojun    760:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    761:        struct mbuf **mp;
                    762:        int *offp;
                    763: {
1.35      itojun    764:        struct mbuf *m = *mp;
1.2       itojun    765:        int off = *offp, hbhlen;
                    766:        struct ip6_hbh *hbh;
                    767:        u_int8_t *opt;
                    768:
                    769:        /* validation of the length of the header */
1.9       itojun    770: #ifndef PULLDOWN_TEST
1.2       itojun    771:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
                    772:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    773:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    774:
                    775:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
                    776:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9       itojun    777: #else
                    778:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    779:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    780:        if (hbh == NULL) {
                    781:                ip6stat.ip6s_tooshort++;
                    782:                return -1;
                    783:        }
                    784:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    785:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    786:                hbhlen);
                    787:        if (hbh == NULL) {
                    788:                ip6stat.ip6s_tooshort++;
                    789:                return -1;
                    790:        }
                    791: #endif
1.2       itojun    792:        off += hbhlen;
                    793:        hbhlen -= sizeof(struct ip6_hbh);
                    794:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    795:
                    796:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    797:                                hbhlen, rtalertp, plenp) < 0)
                    798:                return(-1);
                    799:
                    800:        *offp = off;
                    801:        *mp = m;
                    802:        return(0);
                    803: }
                    804:
                    805: /*
                    806:  * Search header for all Hop-by-hop options and process each option.
                    807:  * This function is separate from ip6_hopopts_input() in order to
                    808:  * handle a case where the sending node itself process its hop-by-hop
                    809:  * options header. In such a case, the function is called from ip6_output().
1.37.2.9  nathanw   810:  *
                    811:  * The function assumes that hbh header is located right after the IPv6 header
                    812:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    813:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    814:  */
                    815: int
                    816: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    817:        struct mbuf *m;
                    818:        u_int8_t *opthead;
                    819:        int hbhlen;
1.5       itojun    820:        u_int32_t *rtalertp;
1.2       itojun    821:        u_int32_t *plenp;
                    822: {
                    823:        struct ip6_hdr *ip6;
                    824:        int optlen = 0;
                    825:        u_int8_t *opt = opthead;
                    826:        u_int16_t rtalert_val;
1.22      itojun    827:        u_int32_t jumboplen;
1.37.2.9  nathanw   828:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    829:
                    830:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    831:                switch (*opt) {
                    832:                case IP6OPT_PAD1:
                    833:                        optlen = 1;
                    834:                        break;
                    835:                case IP6OPT_PADN:
                    836:                        if (hbhlen < IP6OPT_MINLEN) {
                    837:                                ip6stat.ip6s_toosmall++;
                    838:                                goto bad;
                    839:                        }
                    840:                        optlen = *(opt + 1) + 2;
                    841:                        break;
                    842:                case IP6OPT_RTALERT:
                    843:                        /* XXX may need check for alignment */
                    844:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    845:                                ip6stat.ip6s_toosmall++;
                    846:                                goto bad;
                    847:                        }
                    848:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.37.2.9  nathanw   849:                                /* XXX stat */
                    850:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    851:                                    ICMP6_PARAMPROB_HEADER,
                    852:                                    erroff + opt + 1 - opthead);
                    853:                                return (-1);
1.35      itojun    854:                        }
                    855:                        optlen = IP6OPT_RTALERT_LEN;
                    856:                        bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    857:                        *rtalertp = ntohs(rtalert_val);
                    858:                        break;
                    859:                case IP6OPT_JUMBO:
1.22      itojun    860:                        /* XXX may need check for alignment */
                    861:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    862:                                ip6stat.ip6s_toosmall++;
                    863:                                goto bad;
                    864:                        }
1.35      itojun    865:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.37.2.9  nathanw   866:                                /* XXX stat */
                    867:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    868:                                    ICMP6_PARAMPROB_HEADER,
                    869:                                    erroff + opt + 1 - opthead);
                    870:                                return (-1);
1.35      itojun    871:                        }
1.22      itojun    872:                        optlen = IP6OPT_JUMBO_LEN;
                    873:
                    874:                        /*
                    875:                         * IPv6 packets that have non 0 payload length
1.35      itojun    876:                         * must not contain a jumbo payload option.
1.22      itojun    877:                         */
                    878:                        ip6 = mtod(m, struct ip6_hdr *);
                    879:                        if (ip6->ip6_plen) {
                    880:                                ip6stat.ip6s_badoptions++;
                    881:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.37.2.9  nathanw   882:                                    ICMP6_PARAMPROB_HEADER,
                    883:                                    erroff + opt - opthead);
                    884:                                return (-1);
1.22      itojun    885:                        }
1.2       itojun    886:
1.22      itojun    887:                        /*
                    888:                         * We may see jumbolen in unaligned location, so
                    889:                         * we'd need to perform bcopy().
                    890:                         */
                    891:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    892:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    893:
                    894: #if 1
                    895:                        /*
                    896:                         * if there are multiple jumbo payload options,
                    897:                         * *plenp will be non-zero and the packet will be
                    898:                         * rejected.
                    899:                         * the behavior may need some debate in ipngwg -
                    900:                         * multiple options does not make sense, however,
                    901:                         * there's no explicit mention in specification.
                    902:                         */
                    903:                        if (*plenp != 0) {
                    904:                                ip6stat.ip6s_badoptions++;
                    905:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.37.2.9  nathanw   906:                                    ICMP6_PARAMPROB_HEADER,
                    907:                                    erroff + opt + 2 - opthead);
                    908:                                return (-1);
1.22      itojun    909:                        }
1.8       itojun    910: #endif
1.2       itojun    911:
1.22      itojun    912:                        /*
                    913:                         * jumbo payload length must be larger than 65535.
                    914:                         */
                    915:                        if (jumboplen <= IPV6_MAXPACKET) {
                    916:                                ip6stat.ip6s_badoptions++;
                    917:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.37.2.9  nathanw   918:                                    ICMP6_PARAMPROB_HEADER,
                    919:                                    erroff + opt + 2 - opthead);
                    920:                                return (-1);
1.22      itojun    921:                        }
                    922:                        *plenp = jumboplen;
                    923:
                    924:                        break;
1.35      itojun    925:                default:                /* unknown option */
                    926:                        if (hbhlen < IP6OPT_MINLEN) {
                    927:                                ip6stat.ip6s_toosmall++;
                    928:                                goto bad;
                    929:                        }
1.37.2.9  nathanw   930:                        optlen = ip6_unknown_opt(opt, m,
                    931:                            erroff + opt - opthead);
                    932:                        if (optlen == -1)
                    933:                                return (-1);
1.35      itojun    934:                        optlen += 2;
                    935:                        break;
1.2       itojun    936:                }
                    937:        }
                    938:
1.37.2.9  nathanw   939:        return (0);
1.2       itojun    940:
                    941:   bad:
                    942:        m_freem(m);
1.37.2.9  nathanw   943:        return (-1);
1.2       itojun    944: }
                    945:
                    946: /*
                    947:  * Unknown option processing.
                    948:  * The third argument `off' is the offset from the IPv6 header to the option,
                    949:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    950:  * is not continuous in order to return an ICMPv6 error.
                    951:  */
                    952: int
                    953: ip6_unknown_opt(optp, m, off)
                    954:        u_int8_t *optp;
                    955:        struct mbuf *m;
                    956:        int off;
                    957: {
                    958:        struct ip6_hdr *ip6;
                    959:
1.35      itojun    960:        switch (IP6OPT_TYPE(*optp)) {
                    961:        case IP6OPT_TYPE_SKIP: /* ignore the option */
                    962:                return((int)*(optp + 1));
                    963:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                    964:                m_freem(m);
                    965:                return(-1);
                    966:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    967:                ip6stat.ip6s_badoptions++;
                    968:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
                    969:                return(-1);
                    970:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    971:                ip6stat.ip6s_badoptions++;
                    972:                ip6 = mtod(m, struct ip6_hdr *);
                    973:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    974:                    (m->m_flags & (M_BCAST|M_MCAST)))
                    975:                        m_freem(m);
                    976:                else
                    977:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    978:                                    ICMP6_PARAMPROB_OPTION, off);
                    979:                return(-1);
1.2       itojun    980:        }
                    981:
                    982:        m_freem(m);             /* XXX: NOTREACHED */
                    983:        return(-1);
                    984: }
                    985:
                    986: /*
1.9       itojun    987:  * Create the "control" list for this pcb.
                    988:  *
                    989:  * The routine will be called from upper layer handlers like tcp6_input().
                    990:  * Thus the routine assumes that the caller (tcp6_input) have already
                    991:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                    992:  * very first mbuf on the mbuf chain.
                    993:  * We may want to add some infinite loop prevention or sanity checks for safety.
                    994:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                    995:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun    996:  */
                    997: void
                    998: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun    999:        struct in6pcb *in6p;
                   1000:        struct mbuf **mp;
                   1001:        struct ip6_hdr *ip6;
                   1002:        struct mbuf *m;
1.2       itojun   1003: {
1.37.2.10  nathanw  1004:        struct proc *p = curproc;       /* XXX */
1.9       itojun   1005:        int privileged;
1.2       itojun   1006:
1.9       itojun   1007:        privileged = 0;
                   1008:        if (p && !suser(p->p_ucred, &p->p_acflag))
                   1009:                privileged++;
                   1010:
                   1011: #ifdef SO_TIMESTAMP
1.2       itojun   1012:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1013:                struct timeval tv;
                   1014:
                   1015:                microtime(&tv);
                   1016:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                   1017:                        SCM_TIMESTAMP, SOL_SOCKET);
                   1018:                if (*mp)
                   1019:                        mp = &(*mp)->m_next;
                   1020:        }
1.9       itojun   1021: #endif
1.2       itojun   1022:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                   1023:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
                   1024:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
                   1025:                        IPPROTO_IPV6);
                   1026:                if (*mp)
                   1027:                        mp = &(*mp)->m_next;
                   1028:        }
                   1029:
                   1030: #ifdef noyet
                   1031:        /* options were tossed above */
                   1032:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                   1033:                /* broken */
                   1034:        /* ip6_srcroute doesn't do what we want here, need to fix */
                   1035:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                   1036:                /* broken */
                   1037: #endif
                   1038:
                   1039:        /* RFC 2292 sec. 5 */
1.35      itojun   1040:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1041:                struct in6_pktinfo pi6;
                   1042:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                   1043:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                   1044:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                   1045:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                   1046:                                        ? m->m_pkthdr.rcvif->if_index
                   1047:                                        : 0;
                   1048:                *mp = sbcreatecontrol((caddr_t) &pi6,
                   1049:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
                   1050:                        IPPROTO_IPV6);
                   1051:                if (*mp)
                   1052:                        mp = &(*mp)->m_next;
                   1053:        }
                   1054:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1055:                int hlim = ip6->ip6_hlim & 0xff;
                   1056:                *mp = sbcreatecontrol((caddr_t) &hlim,
                   1057:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
                   1058:                if (*mp)
                   1059:                        mp = &(*mp)->m_next;
                   1060:        }
                   1061:        /* IN6P_NEXTHOP - for outgoing packet only */
                   1062:
                   1063:        /*
                   1064:         * IPV6_HOPOPTS socket option. We require super-user privilege
                   1065:         * for the option, but it might be too strict, since there might
                   1066:         * be some hop-by-hop options which can be returned to normal user.
                   1067:         * See RFC 2292 section 6.
                   1068:         */
1.35      itojun   1069:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2       itojun   1070:                /*
                   1071:                 * Check if a hop-by-hop options header is contatined in the
                   1072:                 * received packet, and if so, store the options as ancillary
                   1073:                 * data. Note that a hop-by-hop options header must be
                   1074:                 * just after the IPv6 header, which fact is assured through
                   1075:                 * the IPv6 input processing.
                   1076:                 */
                   1077:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1078:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1079:                        struct ip6_hbh *hbh;
                   1080:                        int hbhlen;
                   1081:
                   1082: #ifndef PULLDOWN_TEST
                   1083:                        hbh = (struct ip6_hbh *)(ip6 + 1);
                   1084:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1085: #else
                   1086:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1087:                                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                   1088:                        if (hbh == NULL) {
                   1089:                                ip6stat.ip6s_tooshort++;
                   1090:                                return;
                   1091:                        }
                   1092:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1093:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1094:                                sizeof(struct ip6_hdr), hbhlen);
                   1095:                        if (hbh == NULL) {
                   1096:                                ip6stat.ip6s_tooshort++;
                   1097:                                return;
                   1098:                        }
                   1099: #endif
1.2       itojun   1100:
                   1101:                        /*
                   1102:                         * XXX: We copy whole the header even if a jumbo
                   1103:                         * payload option is included, which option is to
                   1104:                         * be removed before returning in the RFC 2292.
                   1105:                         * But it's too painful operation...
                   1106:                         */
1.9       itojun   1107:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2       itojun   1108:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
                   1109:                        if (*mp)
                   1110:                                mp = &(*mp)->m_next;
                   1111:                }
                   1112:        }
                   1113:
                   1114:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1115:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1116:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1117:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
                   1118:
                   1119:                /*
                   1120:                 * Search for destination options headers or routing
                   1121:                 * header(s) through the header chain, and stores each
                   1122:                 * header as ancillary data.
                   1123:                 * Note that the order of the headers remains in
                   1124:                 * the chain of ancillary data.
                   1125:                 */
1.35      itojun   1126:                while (1) {     /* is explicit loop prevention necessary? */
1.9       itojun   1127:                        struct ip6_ext *ip6e;
                   1128:                        int elen;
                   1129:
                   1130: #ifndef PULLDOWN_TEST
                   1131:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
                   1132:                        if (nxt == IPPROTO_AH)
                   1133:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1134:                        else
                   1135:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1136: #else
                   1137:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
                   1138:                                sizeof(struct ip6_ext));
                   1139:                        if (ip6e == NULL) {
                   1140:                                ip6stat.ip6s_tooshort++;
                   1141:                                return;
                   1142:                        }
                   1143:                        if (nxt == IPPROTO_AH)
                   1144:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1145:                        else
                   1146:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1147:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
                   1148:                        if (ip6e == NULL) {
                   1149:                                ip6stat.ip6s_tooshort++;
                   1150:                                return;
                   1151:                        }
                   1152: #endif
1.2       itojun   1153:
1.35      itojun   1154:                        switch (nxt) {
                   1155:                        case IPPROTO_DSTOPTS:
                   1156:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1157:                                        break;
                   1158:
                   1159:                                /*
                   1160:                                 * We also require super-user privilege for
                   1161:                                 * the option.
                   1162:                                 * See the comments on IN6_HOPOPTS.
                   1163:                                 */
                   1164:                                if (!privileged)
                   1165:                                        break;
                   1166:
                   1167:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1168:                                                      IPV6_DSTOPTS,
                   1169:                                                      IPPROTO_IPV6);
                   1170:                                if (*mp)
                   1171:                                        mp = &(*mp)->m_next;
                   1172:                                break;
                   1173:
                   1174:                        case IPPROTO_ROUTING:
                   1175:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1176:                                        break;
                   1177:
                   1178:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
                   1179:                                                      IPV6_RTHDR,
                   1180:                                                      IPPROTO_IPV6);
                   1181:                                if (*mp)
                   1182:                                        mp = &(*mp)->m_next;
                   1183:                                break;
                   1184:
                   1185:                        case IPPROTO_UDP:
                   1186:                        case IPPROTO_TCP:
                   1187:                        case IPPROTO_ICMPV6:
                   1188:                        default:
                   1189:                                /*
                   1190:                                 * stop search if we encounter an upper
                   1191:                                 * layer protocol headers.
                   1192:                                 */
                   1193:                                goto loopend;
                   1194:
                   1195:                        case IPPROTO_HOPOPTS:
                   1196:                        case IPPROTO_AH: /* is it possible? */
                   1197:                                break;
1.2       itojun   1198:                        }
                   1199:
                   1200:                        /* proceed with the next header. */
1.9       itojun   1201:                        off += elen;
1.2       itojun   1202:                        nxt = ip6e->ip6e_nxt;
                   1203:                }
                   1204:          loopend:
1.36      cgd      1205:                ;
1.2       itojun   1206:        }
1.9       itojun   1207:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun   1208:                /* to be done */
                   1209:        }
1.9       itojun   1210:        if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2       itojun   1211:                /* to be done */
                   1212:        }
                   1213:        /* IN6P_RTHDR - to be done */
                   1214:
                   1215: }
                   1216:
                   1217: /*
                   1218:  * Get pointer to the previous header followed by the header
                   1219:  * currently processed.
                   1220:  * XXX: This function supposes that
                   1221:  *     M includes all headers,
                   1222:  *     the next header field and the header length field of each header
                   1223:  *     are valid, and
                   1224:  *     the sum of each header length equals to OFF.
                   1225:  * Because of these assumptions, this function must be called very
                   1226:  * carefully. Moreover, it will not be used in the near future when
                   1227:  * we develop `neater' mechanism to process extension headers.
                   1228:  */
                   1229: char *
                   1230: ip6_get_prevhdr(m, off)
                   1231:        struct mbuf *m;
                   1232:        int off;
                   1233: {
                   1234:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1235:
                   1236:        if (off == sizeof(struct ip6_hdr))
                   1237:                return(&ip6->ip6_nxt);
                   1238:        else {
                   1239:                int len, nxt;
                   1240:                struct ip6_ext *ip6e = NULL;
                   1241:
                   1242:                nxt = ip6->ip6_nxt;
                   1243:                len = sizeof(struct ip6_hdr);
                   1244:                while (len < off) {
                   1245:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1246:
1.35      itojun   1247:                        switch (nxt) {
1.2       itojun   1248:                        case IPPROTO_FRAGMENT:
                   1249:                                len += sizeof(struct ip6_frag);
                   1250:                                break;
                   1251:                        case IPPROTO_AH:
                   1252:                                len += (ip6e->ip6e_len + 2) << 2;
                   1253:                                break;
                   1254:                        default:
                   1255:                                len += (ip6e->ip6e_len + 1) << 3;
                   1256:                                break;
                   1257:                        }
                   1258:                        nxt = ip6e->ip6e_nxt;
                   1259:                }
                   1260:                if (ip6e)
                   1261:                        return(&ip6e->ip6e_nxt);
                   1262:                else
                   1263:                        return NULL;
1.18      itojun   1264:        }
                   1265: }
                   1266:
                   1267: /*
                   1268:  * get next header offset.  m will be retained.
                   1269:  */
                   1270: int
                   1271: ip6_nexthdr(m, off, proto, nxtp)
                   1272:        struct mbuf *m;
                   1273:        int off;
                   1274:        int proto;
                   1275:        int *nxtp;
                   1276: {
                   1277:        struct ip6_hdr ip6;
                   1278:        struct ip6_ext ip6e;
                   1279:        struct ip6_frag fh;
                   1280:
                   1281:        /* just in case */
                   1282:        if (m == NULL)
                   1283:                panic("ip6_nexthdr: m == NULL");
                   1284:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1285:                return -1;
                   1286:
                   1287:        switch (proto) {
                   1288:        case IPPROTO_IPV6:
                   1289:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1290:                        return -1;
                   1291:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1292:                if (nxtp)
                   1293:                        *nxtp = ip6.ip6_nxt;
                   1294:                off += sizeof(ip6);
                   1295:                return off;
                   1296:
                   1297:        case IPPROTO_FRAGMENT:
                   1298:                /*
                   1299:                 * terminate parsing if it is not the first fragment,
                   1300:                 * it does not make sense to parse through it.
                   1301:                 */
                   1302:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1303:                        return -1;
                   1304:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
                   1305:                if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
                   1306:                        return -1;
                   1307:                if (nxtp)
                   1308:                        *nxtp = fh.ip6f_nxt;
                   1309:                off += sizeof(struct ip6_frag);
                   1310:                return off;
                   1311:
                   1312:        case IPPROTO_AH:
                   1313:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1314:                        return -1;
                   1315:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1316:                if (nxtp)
                   1317:                        *nxtp = ip6e.ip6e_nxt;
                   1318:                off += (ip6e.ip6e_len + 2) << 2;
1.37.2.7  nathanw  1319:                if (m->m_pkthdr.len < off)
                   1320:                        return -1;
1.18      itojun   1321:                return off;
                   1322:
                   1323:        case IPPROTO_HOPOPTS:
                   1324:        case IPPROTO_ROUTING:
                   1325:        case IPPROTO_DSTOPTS:
                   1326:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1327:                        return -1;
                   1328:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1329:                if (nxtp)
                   1330:                        *nxtp = ip6e.ip6e_nxt;
                   1331:                off += (ip6e.ip6e_len + 1) << 3;
1.37.2.7  nathanw  1332:                if (m->m_pkthdr.len < off)
                   1333:                        return -1;
1.18      itojun   1334:                return off;
                   1335:
                   1336:        case IPPROTO_NONE:
                   1337:        case IPPROTO_ESP:
                   1338:        case IPPROTO_IPCOMP:
                   1339:                /* give up */
                   1340:                return -1;
                   1341:
                   1342:        default:
                   1343:                return -1;
                   1344:        }
                   1345:
                   1346:        return -1;
                   1347: }
                   1348:
                   1349: /*
                   1350:  * get offset for the last header in the chain.  m will be kept untainted.
                   1351:  */
                   1352: int
                   1353: ip6_lasthdr(m, off, proto, nxtp)
                   1354:        struct mbuf *m;
                   1355:        int off;
                   1356:        int proto;
                   1357:        int *nxtp;
                   1358: {
                   1359:        int newoff;
                   1360:        int nxt;
                   1361:
                   1362:        if (!nxtp) {
                   1363:                nxt = -1;
                   1364:                nxtp = &nxt;
                   1365:        }
                   1366:        while (1) {
                   1367:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1368:                if (newoff < 0)
                   1369:                        return off;
                   1370:                else if (newoff < off)
                   1371:                        return -1;      /* invalid */
                   1372:                else if (newoff == off)
                   1373:                        return newoff;
                   1374:
                   1375:                off = newoff;
                   1376:                proto = *nxtp;
1.2       itojun   1377:        }
                   1378: }
                   1379:
                   1380: /*
                   1381:  * System control for IP6
                   1382:  */
                   1383:
                   1384: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1385:        0,              0,              0,              0,
                   1386:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1387:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1388:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1389:        0,              0,              0,              0,
                   1390:        ENOPROTOOPT
                   1391: };
                   1392:
                   1393: int
                   1394: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1395:        int *name;
                   1396:        u_int namelen;
                   1397:        void *oldp;
                   1398:        size_t *oldlenp;
                   1399:        void *newp;
                   1400:        size_t newlen;
                   1401: {
1.26      itojun   1402:        int old, error;
                   1403:
1.2       itojun   1404:        /* All sysctl names at this level are terminal. */
                   1405:        if (namelen != 1)
                   1406:                return ENOTDIR;
                   1407:
                   1408:        switch (name[0]) {
                   1409:
                   1410:        case IPV6CTL_FORWARDING:
                   1411:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1412:                                  &ip6_forwarding);
                   1413:        case IPV6CTL_SENDREDIRECTS:
                   1414:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1415:                                &ip6_sendredirects);
                   1416:        case IPV6CTL_DEFHLIM:
                   1417:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                   1418:        case IPV6CTL_MAXFRAGPACKETS:
                   1419:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1420:                                &ip6_maxfragpackets);
                   1421:        case IPV6CTL_ACCEPT_RTADV:
                   1422:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1423:                                &ip6_accept_rtadv);
                   1424:        case IPV6CTL_KEEPFAITH:
                   1425:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                   1426:        case IPV6CTL_LOG_INTERVAL:
                   1427:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1428:                                &ip6_log_interval);
                   1429:        case IPV6CTL_HDRNESTLIMIT:
                   1430:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1431:                                &ip6_hdrnestlimit);
                   1432:        case IPV6CTL_DAD_COUNT:
                   1433:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1434:        case IPV6CTL_AUTO_FLOWLABEL:
                   1435:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1436:                                &ip6_auto_flowlabel);
                   1437:        case IPV6CTL_DEFMCASTHLIM:
                   1438:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1439:                                &ip6_defmcasthlim);
1.37.2.8  nathanw  1440: #if NGIF > 0
1.2       itojun   1441:        case IPV6CTL_GIF_HLIM:
                   1442:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1443:                                &ip6_gif_hlim);
1.37.2.8  nathanw  1444: #endif
1.2       itojun   1445:        case IPV6CTL_KAME_VERSION:
                   1446:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9       itojun   1447:        case IPV6CTL_USE_DEPRECATED:
                   1448:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1449:                                &ip6_use_deprecated);
1.10      itojun   1450:        case IPV6CTL_RR_PRUNE:
                   1451:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.37.2.6  nathanw  1452:        case IPV6CTL_V6ONLY:
                   1453: #ifdef INET6_BINDV6ONLY
                   1454:                return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
                   1455: #else
                   1456:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
1.26      itojun   1457: #endif
                   1458:        case IPV6CTL_ANONPORTMIN:
                   1459:                old = ip6_anonportmin;
                   1460:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1461:                    &ip6_anonportmin);
                   1462:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
                   1463:                    ip6_anonportmin > 65535
                   1464: #ifndef IPNOPRIVPORTS
                   1465:                    || ip6_anonportmin < IPV6PORT_RESERVED
                   1466: #endif
                   1467:                    ) {
                   1468:                        ip6_anonportmin = old;
                   1469:                        return (EINVAL);
                   1470:                }
                   1471:                return (error);
                   1472:        case IPV6CTL_ANONPORTMAX:
                   1473:                old = ip6_anonportmax;
                   1474:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1475:                    &ip6_anonportmax);
                   1476:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
                   1477:                    ip6_anonportmax > 65535
                   1478: #ifndef IPNOPRIVPORTS
                   1479:                    || ip6_anonportmax < IPV6PORT_RESERVED
                   1480: #endif
                   1481:                    ) {
                   1482:                        ip6_anonportmax = old;
                   1483:                        return (EINVAL);
                   1484:                }
                   1485:                return (error);
                   1486: #ifndef IPNOPRIVPORTS
                   1487:        case IPV6CTL_LOWPORTMIN:
                   1488:                old = ip6_lowportmin;
                   1489:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1490:                    &ip6_lowportmin);
                   1491:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1492:                    ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
                   1493:                    ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
                   1494:                        ip6_lowportmin = old;
                   1495:                        return (EINVAL);
                   1496:                }
                   1497:                return (error);
                   1498:        case IPV6CTL_LOWPORTMAX:
                   1499:                old = ip6_lowportmax;
                   1500:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1501:                    &ip6_lowportmax);
                   1502:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1503:                    ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
                   1504:                    ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
                   1505:                        ip6_lowportmax = old;
                   1506:                        return (EINVAL);
                   1507:                }
                   1508:                return (error);
1.11      itojun   1509: #endif
1.37.2.9  nathanw  1510:        case IPV6CTL_MAXFRAGS:
                   1511:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
1.2       itojun   1512:        default:
                   1513:                return EOPNOTSUPP;
                   1514:        }
                   1515:        /* NOTREACHED */
                   1516: }

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