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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.73.2.1.2.1

1.73.2.1.2.1! riz         1: /*     $NetBSD: ip6_input.c,v 1.73.2.1 2004/05/28 07:23:48 tron Exp $  */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
1.65      agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.73.2.1.2.1! riz        65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.73.2.1 2004/05/28 07:23:48 tron Exp $");
1.2       itojun     66:
                     67: #include "opt_inet.h"
1.4       thorpej    68: #include "opt_ipsec.h"
1.15      darrenr    69: #include "opt_pfil_hooks.h"
1.2       itojun     70:
                     71: #include <sys/param.h>
                     72: #include <sys/systm.h>
                     73: #include <sys/malloc.h>
                     74: #include <sys/mbuf.h>
                     75: #include <sys/domain.h>
                     76: #include <sys/protosw.h>
                     77: #include <sys/socket.h>
                     78: #include <sys/socketvar.h>
                     79: #include <sys/errno.h>
                     80: #include <sys/time.h>
                     81: #include <sys/kernel.h>
                     82: #include <sys/syslog.h>
                     83: #include <sys/proc.h>
1.46      simonb     84: #include <sys/sysctl.h>
1.2       itojun     85:
                     86: #include <net/if.h>
                     87: #include <net/if_types.h>
                     88: #include <net/if_dl.h>
                     89: #include <net/route.h>
                     90: #include <net/netisr.h>
1.15      darrenr    91: #ifdef PFIL_HOOKS
                     92: #include <net/pfil.h>
                     93: #endif
1.2       itojun     94:
                     95: #include <netinet/in.h>
1.9       itojun     96: #include <netinet/in_systm.h>
                     97: #ifdef INET
                     98: #include <netinet/ip.h>
                     99: #include <netinet/ip_icmp.h>
1.45      itojun    100: #endif /* INET */
1.14      itojun    101: #include <netinet/ip6.h>
1.2       itojun    102: #include <netinet6/in6_var.h>
1.11      itojun    103: #include <netinet6/ip6_var.h>
1.2       itojun    104: #include <netinet6/in6_pcb.h>
1.14      itojun    105: #include <netinet/icmp6.h>
1.2       itojun    106: #include <netinet6/in6_ifattach.h>
                    107: #include <netinet6/nd6.h>
                    108:
1.37      itojun    109: #ifdef IPSEC
                    110: #include <netinet6/ipsec.h>
                    111: #endif
                    112:
1.2       itojun    113: #include <netinet6/ip6protosw.h>
                    114:
                    115: /* we need it for NLOOP. */
                    116: #include "loop.h"
                    117: #include "faith.h"
                    118: #include "gif.h"
                    119: #include "bpfilter.h"
1.50      itojun    120:
                    121: #if NGIF > 0
                    122: #include <netinet6/in6_gif.h>
                    123: #endif
1.2       itojun    124:
1.9       itojun    125: #include <net/net_osdep.h>
                    126:
1.2       itojun    127: extern struct domain inet6domain;
                    128:
                    129: u_char ip6_protox[IPPROTO_MAX];
                    130: static int ip6qmaxlen = IFQ_MAXLEN;
                    131: struct in6_ifaddr *in6_ifaddr;
                    132: struct ifqueue ip6intrq;
                    133:
                    134: extern struct ifnet loif[NLOOP];
                    135: int ip6_forward_srcrt;                 /* XXX */
                    136: int ip6_sourcecheck;                   /* XXX */
                    137: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    138:
1.29      thorpej   139: #ifdef PFIL_HOOKS
                    140: struct pfil_head inet6_pfil_hook;
                    141: #endif
                    142:
1.2       itojun    143: struct ip6stat ip6stat;
                    144:
                    145: static void ip6_init2 __P((void *));
                    146:
1.5       itojun    147: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.62      itojun    148: static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int));
1.2       itojun    149:
                    150: /*
                    151:  * IP6 initialization: fill in IP6 protocol switch table.
                    152:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    153:  */
                    154: void
                    155: ip6_init()
                    156: {
1.35      itojun    157:        struct ip6protosw *pr;
                    158:        int i;
1.2       itojun    159:
                    160:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    161:        if (pr == 0)
                    162:                panic("ip6_init");
                    163:        for (i = 0; i < IPPROTO_MAX; i++)
                    164:                ip6_protox[i] = pr - inet6sw;
                    165:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    166:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    167:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    168:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    169:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    170:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    171:        nd6_init();
                    172:        frag6_init();
                    173:
                    174:        ip6_init2((void *)0);
1.29      thorpej   175:
                    176: #ifdef PFIL_HOOKS
                    177:        /* Register our Packet Filter hook. */
1.33      thorpej   178:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    179:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   180:        i = pfil_head_register(&inet6_pfil_hook);
                    181:        if (i != 0)
                    182:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    183:                    "error %d\n", i);
                    184: #endif /* PFIL_HOOKS */
1.2       itojun    185: }
                    186:
                    187: static void
                    188: ip6_init2(dummy)
                    189:        void *dummy;
                    190: {
                    191:
                    192:        /* nd6_timer_init */
1.19      thorpej   193:        callout_init(&nd6_timer_ch);
                    194:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.2       itojun    195: }
                    196:
                    197: /*
                    198:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    199:  */
                    200: void
                    201: ip6intr()
                    202: {
                    203:        int s;
                    204:        struct mbuf *m;
                    205:
                    206:        for (;;) {
1.41      thorpej   207:                s = splnet();
1.2       itojun    208:                IF_DEQUEUE(&ip6intrq, m);
                    209:                splx(s);
                    210:                if (m == 0)
                    211:                        return;
                    212:                ip6_input(m);
                    213:        }
                    214: }
                    215:
                    216: extern struct  route_in6 ip6_forward_rt;
                    217:
                    218: void
                    219: ip6_input(m)
                    220:        struct mbuf *m;
                    221: {
1.9       itojun    222:        struct ip6_hdr *ip6;
1.2       itojun    223:        int off = sizeof(struct ip6_hdr), nest;
                    224:        u_int32_t plen;
1.5       itojun    225:        u_int32_t rtalert = ~0;
1.2       itojun    226:        int nxt, ours = 0;
1.9       itojun    227:        struct ifnet *deliverifp = NULL;
1.64      itojun    228:        int srcrt = 0;
1.2       itojun    229:
                    230: #ifdef IPSEC
                    231:        /*
                    232:         * should the inner packet be considered authentic?
                    233:         * see comment in ah4_input().
                    234:         */
1.49      itojun    235:        m->m_flags &= ~M_AUTHIPHDR;
                    236:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    237: #endif
1.9       itojun    238:
1.2       itojun    239:        /*
1.44      itojun    240:         * mbuf statistics
1.2       itojun    241:         */
                    242:        if (m->m_flags & M_EXT) {
                    243:                if (m->m_next)
                    244:                        ip6stat.ip6s_mext2m++;
                    245:                else
                    246:                        ip6stat.ip6s_mext1++;
                    247:        } else {
1.40      itojun    248: #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
1.2       itojun    249:                if (m->m_next) {
1.9       itojun    250:                        if (m->m_flags & M_LOOP) {
1.44      itojun    251:                                ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
1.40      itojun    252:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    253:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    254:                        else
                    255:                                ip6stat.ip6s_m2m[0]++;
                    256:                } else
                    257:                        ip6stat.ip6s_m1++;
1.40      itojun    258: #undef M2MMAX
1.2       itojun    259:        }
                    260:
1.9       itojun    261:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    262:        ip6stat.ip6s_total++;
                    263:
1.57      thorpej   264:        /*
                    265:         * If the IPv6 header is not aligned, slurp it up into a new
                    266:         * mbuf with space for link headers, in the event we forward
                    267:         * it.  OTherwise, if it is aligned, make sure the entire base
                    268:         * IPv6 header is in the first mbuf of the chain.
                    269:         */
                    270:        if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) {
                    271:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    272:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    273:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    274:                        /* XXXJRT new stat, please */
                    275:                        ip6stat.ip6s_toosmall++;
                    276:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    277:                        return;
                    278:                }
                    279:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    280:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    281:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9       itojun    282:                        ip6stat.ip6s_toosmall++;
                    283:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    284:                        return;
                    285:                }
1.2       itojun    286:        }
                    287:
                    288:        ip6 = mtod(m, struct ip6_hdr *);
                    289:
                    290:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    291:                ip6stat.ip6s_badvers++;
1.9       itojun    292:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    293:                goto bad;
                    294:        }
1.15      darrenr   295:
                    296: #ifdef PFIL_HOOKS
                    297:        /*
                    298:         * Run through list of hooks for input packets.  If there are any
                    299:         * filters which require that additional packets in the flow are
                    300:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    301:         * Note that filters must _never_ set this flag, as another filter
                    302:         * in the list may have previously cleared it.
                    303:         */
1.39      itojun    304:        /*
                    305:         * let ipfilter look at packet on the wire,
                    306:         * not the decapsulated packet.
                    307:         */
                    308: #ifdef IPSEC
1.42      itojun    309:        if (!ipsec_getnhist(m))
1.39      itojun    310: #else
                    311:        if (1)
                    312: #endif
                    313:        {
1.64      itojun    314:                struct in6_addr odst;
                    315:
                    316:                odst = ip6->ip6_dst;
1.39      itojun    317:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    318:                                   PFIL_IN) != 0)
                    319:                        return;
                    320:                if (m == NULL)
                    321:                        return;
                    322:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    323:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    324:        }
1.15      darrenr   325: #endif /* PFIL_HOOKS */
                    326:
1.2       itojun    327:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    328:
1.30      thorpej   329: #ifdef ALTQ
                    330:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    331:                /* packet is dropped by traffic conditioner */
                    332:                return;
1.9       itojun    333:        }
                    334: #endif
                    335:
1.2       itojun    336:        /*
1.44      itojun    337:         * Check against address spoofing/corruption.
1.2       itojun    338:         */
                    339:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    340:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    341:                /*
                    342:                 * XXX: "badscope" is not very suitable for a multicast source.
                    343:                 */
1.2       itojun    344:                ip6stat.ip6s_badscope++;
1.9       itojun    345:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    346:                goto bad;
                    347:        }
1.13      itojun    348:        /*
1.44      itojun    349:         * The following check is not documented in specs.  A malicious
                    350:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    351:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    352:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    353:         *
1.44      itojun    354:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    355:         * support IPv4-less kernel compilation, we cannot support SIIT
                    356:         * environment at all.  So, it makes more sense for us to reject any
                    357:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       358:         * partial support for SIIT environment.
1.13      itojun    359:         */
                    360:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    361:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    362:                ip6stat.ip6s_badscope++;
                    363:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    364:                goto bad;
                    365:        }
1.17      itojun    366: #if 0
1.13      itojun    367:        /*
1.17      itojun    368:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    369:         *
                    370:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    371:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    372:         * is revised to forbid relaying case.
1.13      itojun    373:         */
                    374:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    375:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    376:                ip6stat.ip6s_badscope++;
                    377:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    378:                goto bad;
                    379:        }
                    380: #endif
1.35      itojun    381:
1.2       itojun    382:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    383:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    384:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    385:                        ours = 1;
1.9       itojun    386:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    387:                        goto hbhcheck;
                    388:                } else {
                    389:                        ip6stat.ip6s_badscope++;
1.9       itojun    390:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    391:                        goto bad;
                    392:                }
                    393:        }
                    394:
1.38      itojun    395:        /* drop packets if interface ID portion is already filled */
                    396:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
                    397:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
                    398:                    ip6->ip6_src.s6_addr16[1]) {
                    399:                        ip6stat.ip6s_badscope++;
                    400:                        goto bad;
                    401:                }
                    402:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
                    403:                    ip6->ip6_dst.s6_addr16[1]) {
                    404:                        ip6stat.ip6s_badscope++;
                    405:                        goto bad;
                    406:                }
                    407:        }
1.2       itojun    408:
1.40      itojun    409:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    410:                ip6->ip6_src.s6_addr16[1]
                    411:                        = htons(m->m_pkthdr.rcvif->if_index);
                    412:        if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    413:                ip6->ip6_dst.s6_addr16[1]
                    414:                        = htons(m->m_pkthdr.rcvif->if_index);
                    415:
                    416:        /*
                    417:         * We use rt->rt_ifp to determine if the address is ours or not.
                    418:         * If rt_ifp is lo0, the address is ours.
                    419:         * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
                    420:         * so any address under fe80::%lo0/64 will be mistakenly considered
                    421:         * local.  The special case is supplied to handle the case properly
                    422:         * by actually looking at interface addresses
                    423:         * (using in6ifa_ifpwithaddr).
                    424:         */
                    425:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
                    426:            IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    427:                if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
                    428:                        icmp6_error(m, ICMP6_DST_UNREACH,
                    429:                            ICMP6_DST_UNREACH_ADDR, 0);
                    430:                        /* m is already freed */
                    431:                        return;
1.21      itojun    432:                }
1.40      itojun    433:
                    434:                ours = 1;
                    435:                deliverifp = m->m_pkthdr.rcvif;
                    436:                goto hbhcheck;
1.9       itojun    437:        }
                    438:
1.2       itojun    439:        /*
                    440:         * Multicast check
                    441:         */
                    442:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    443:                struct  in6_multi *in6m = 0;
1.9       itojun    444:
                    445:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    446:                /*
                    447:                 * See if we belong to the destination multicast group on the
                    448:                 * arrival interface.
                    449:                 */
                    450:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    451:                if (in6m)
                    452:                        ours = 1;
                    453:                else if (!ip6_mrouter) {
                    454:                        ip6stat.ip6s_notmember++;
                    455:                        ip6stat.ip6s_cantforward++;
1.9       itojun    456:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    457:                        goto bad;
                    458:                }
1.9       itojun    459:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    460:                goto hbhcheck;
                    461:        }
                    462:
                    463:        /*
                    464:         *  Unicast check
                    465:         */
1.22      itojun    466:        if (ip6_forward_rt.ro_rt != NULL &&
1.55      itojun    467:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
1.22      itojun    468:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.72      itojun    469:            &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
1.25      itojun    470:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    471:        else {
1.35      itojun    472:                struct sockaddr_in6 *dst6;
                    473:
1.2       itojun    474:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    475:                        /* route is down or destination is different */
1.25      itojun    476:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    477:                        RTFREE(ip6_forward_rt.ro_rt);
                    478:                        ip6_forward_rt.ro_rt = 0;
                    479:                }
1.22      itojun    480:
1.2       itojun    481:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
1.35      itojun    482:                dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
                    483:                dst6->sin6_len = sizeof(struct sockaddr_in6);
                    484:                dst6->sin6_family = AF_INET6;
                    485:                dst6->sin6_addr = ip6->ip6_dst;
1.2       itojun    486:
1.9       itojun    487:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    488:        }
                    489:
                    490: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    491:
                    492:        /*
                    493:         * Accept the packet if the forwarding interface to the destination
                    494:         * according to the routing table is the loopback interface,
                    495:         * unless the associated route has a gateway.
                    496:         * Note that this approach causes to accept a packet if there is a
                    497:         * route to the loopback interface for the destination of the packet.
                    498:         * But we think it's even useful in some situations, e.g. when using
                    499:         * a special daemon which wants to intercept the packet.
                    500:         */
                    501:        if (ip6_forward_rt.ro_rt &&
                    502:            (ip6_forward_rt.ro_rt->rt_flags &
                    503:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.55      itojun    504:            !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2       itojun    505: #if 0
                    506:            /*
                    507:             * The check below is redundant since the comparison of
                    508:             * the destination and the key of the rtentry has
                    509:             * already done through looking up the routing table.
                    510:             */
                    511:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.55      itojun    512:            &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2       itojun    513: #endif
1.9       itojun    514:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    515:                struct in6_ifaddr *ia6 =
                    516:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    517:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    518:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    519:                /*
                    520:                 * packets to a tentative, duplicated, or somehow invalid
                    521:                 * address must not be accepted.
                    522:                 */
1.2       itojun    523:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    524:                        /* this address is ready */
1.2       itojun    525:                        ours = 1;
1.9       itojun    526:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    527:                        goto hbhcheck;
                    528:                } else {
1.24      itojun    529:                        /* address is not ready, so discard the packet. */
1.34      itojun    530:                        nd6log((LOG_INFO,
1.27      itojun    531:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    532:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    533:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    534:
                    535:                        goto bad;
1.2       itojun    536:                }
                    537:        }
                    538:
                    539:        /*
1.55      itojun    540:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    541:         */
                    542: #if defined(NFAITH) && 0 < NFAITH
                    543:        if (ip6_keepfaith) {
1.71      itojun    544:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp &&
                    545:                    ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    546:                        /* XXX do we need more sanity checks? */
                    547:                        ours = 1;
1.45      itojun    548:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9       itojun    549:                        goto hbhcheck;
                    550:                }
                    551:        }
                    552: #endif
                    553:
                    554: #if 0
                    555:     {
                    556:        /*
                    557:         * Last resort: check in6_ifaddr for incoming interface.
                    558:         * The code is here until I update the "goto ours hack" code above
                    559:         * working right.
                    560:         */
                    561:        struct ifaddr *ifa;
                    562:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    563:             ifa;
                    564:             ifa = ifa->ifa_list.tqe_next) {
                    565:                if (ifa->ifa_addr == NULL)
                    566:                        continue;       /* just for safety */
                    567:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    568:                        continue;
                    569:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    570:                        ours = 1;
                    571:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    572:                        goto hbhcheck;
                    573:                }
                    574:        }
1.9       itojun    575:     }
1.2       itojun    576: #endif
                    577:
                    578:        /*
                    579:         * Now there is no reason to process the packet if it's not our own
                    580:         * and we're not a router.
                    581:         */
                    582:        if (!ip6_forwarding) {
                    583:                ip6stat.ip6s_cantforward++;
1.9       itojun    584:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    585:                goto bad;
                    586:        }
                    587:
                    588:   hbhcheck:
                    589:        /*
                    590:         * Process Hop-by-Hop options header if it's contained.
                    591:         * m may be modified in ip6_hopopts_input().
                    592:         * If a JumboPayload option is included, plen will also be modified.
                    593:         */
                    594:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    595:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    596:                struct ip6_hbh *hbh;
                    597:
                    598:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    599: #if 0  /*touches NULL pointer*/
                    600:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    601: #endif
1.2       itojun    602:                        return; /* m have already been freed */
1.9       itojun    603:                }
1.22      itojun    604:
1.2       itojun    605:                /* adjust pointer */
                    606:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    607:
                    608:                /*
1.49      itojun    609:                 * if the payload length field is 0 and the next header field
1.22      itojun    610:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    611:                 * option MUST be included.
                    612:                 */
                    613:                if (ip6->ip6_plen == 0 && plen == 0) {
                    614:                        /*
                    615:                         * Note that if a valid jumbo payload option is
                    616:                         * contained, ip6_hoptops_input() must set a valid
1.55      itojun    617:                         * (non-zero) payload length to the variable plen.
1.22      itojun    618:                         */
                    619:                        ip6stat.ip6s_badoptions++;
                    620:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    621:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    622:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    623:                                    ICMP6_PARAMPROB_HEADER,
                    624:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    625:                        return;
                    626:                }
1.9       itojun    627:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    628:                        sizeof(struct ip6_hbh));
                    629:                if (hbh == NULL) {
                    630:                        ip6stat.ip6s_tooshort++;
                    631:                        return;
                    632:                }
1.57      thorpej   633:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    634:                nxt = hbh->ip6h_nxt;
1.2       itojun    635:
                    636:                /*
                    637:                 * accept the packet if a router alert option is included
                    638:                 * and we act as an IPv6 router.
                    639:                 */
1.5       itojun    640:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    641:                        ours = 1;
                    642:        } else
                    643:                nxt = ip6->ip6_nxt;
                    644:
                    645:        /*
                    646:         * Check that the amount of data in the buffers
                    647:         * is as at least much as the IPv6 header would have us expect.
                    648:         * Trim mbufs if longer than we expect.
                    649:         * Drop packet if shorter than we expect.
                    650:         */
                    651:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    652:                ip6stat.ip6s_tooshort++;
1.9       itojun    653:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    654:                goto bad;
                    655:        }
                    656:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    657:                if (m->m_len == m->m_pkthdr.len) {
                    658:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    659:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    660:                } else
                    661:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    662:        }
                    663:
                    664:        /*
                    665:         * Forward if desirable.
                    666:         */
                    667:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    668:                /*
                    669:                 * If we are acting as a multicast router, all
                    670:                 * incoming multicast packets are passed to the
                    671:                 * kernel-level multicast forwarding function.
                    672:                 * The packet is returned (relatively) intact; if
                    673:                 * ip6_mforward() returns a non-zero value, the packet
                    674:                 * must be discarded, else it may be accepted below.
                    675:                 */
                    676:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    677:                        ip6stat.ip6s_cantforward++;
                    678:                        m_freem(m);
                    679:                        return;
                    680:                }
                    681:                if (!ours) {
                    682:                        m_freem(m);
                    683:                        return;
                    684:                }
1.22      itojun    685:        } else if (!ours) {
1.64      itojun    686:                ip6_forward(m, srcrt);
1.2       itojun    687:                return;
1.56      itojun    688:        }
1.25      itojun    689:
                    690:        ip6 = mtod(m, struct ip6_hdr *);
                    691:
                    692:        /*
                    693:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    694:         * tcp/udp stack and bypass security checks (act as if it was from
                    695:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    696:         *
                    697:         * For SIIT end node behavior, you may want to disable the check.
                    698:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    699:         * source.
                    700:         */
                    701:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    702:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    703:                ip6stat.ip6s_badscope++;
                    704:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    705:                goto bad;
                    706:        }
1.2       itojun    707:
                    708:        /*
                    709:         * Tell launch routine the next header
                    710:         */
1.12      itojun    711: #ifdef IFA_STATS
1.28      itojun    712:        if (deliverifp != NULL) {
1.9       itojun    713:                struct in6_ifaddr *ia6;
                    714:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    715:                if (ia6)
                    716:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    717:        }
                    718: #endif
1.2       itojun    719:        ip6stat.ip6s_delivered++;
1.9       itojun    720:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    721:        nest = 0;
1.40      itojun    722:
1.2       itojun    723:        while (nxt != IPPROTO_DONE) {
                    724:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    725:                        ip6stat.ip6s_toomanyhdr++;
                    726:                        goto bad;
                    727:                }
1.8       itojun    728:
                    729:                /*
                    730:                 * protection against faulty packet - there should be
                    731:                 * more sanity checks in header chain processing.
                    732:                 */
                    733:                if (m->m_pkthdr.len < off) {
                    734:                        ip6stat.ip6s_tooshort++;
1.9       itojun    735:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    736:                        goto bad;
                    737:                }
                    738:
1.37      itojun    739: #ifdef IPSEC
                    740:                /*
                    741:                 * enforce IPsec policy checking if we are seeing last header.
                    742:                 * note that we do not visit this with protocols with pcb layer
                    743:                 * code - like udp/tcp/raw ip.
                    744:                 */
                    745:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    746:                    ipsec6_in_reject(m, NULL)) {
                    747:                        ipsec6stat.in_polvio++;
                    748:                        goto bad;
                    749:                }
                    750: #endif
1.56      itojun    751:
1.2       itojun    752:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    753:        }
                    754:        return;
                    755:  bad:
                    756:        m_freem(m);
                    757: }
                    758:
                    759: /*
                    760:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    761:  * included, the real payload length will be stored in plenp.
                    762:  */
                    763: static int
                    764: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    765:        u_int32_t *plenp;
1.5       itojun    766:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    767:        struct mbuf **mp;
                    768:        int *offp;
                    769: {
1.35      itojun    770:        struct mbuf *m = *mp;
1.2       itojun    771:        int off = *offp, hbhlen;
                    772:        struct ip6_hbh *hbh;
                    773:
                    774:        /* validation of the length of the header */
1.9       itojun    775:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    776:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    777:        if (hbh == NULL) {
                    778:                ip6stat.ip6s_tooshort++;
                    779:                return -1;
                    780:        }
                    781:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    782:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    783:                hbhlen);
                    784:        if (hbh == NULL) {
                    785:                ip6stat.ip6s_tooshort++;
                    786:                return -1;
                    787:        }
1.57      thorpej   788:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    789:        off += hbhlen;
                    790:        hbhlen -= sizeof(struct ip6_hbh);
                    791:
                    792:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    793:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    794:                return (-1);
1.2       itojun    795:
                    796:        *offp = off;
                    797:        *mp = m;
1.58      itojun    798:        return (0);
1.2       itojun    799: }
                    800:
                    801: /*
                    802:  * Search header for all Hop-by-hop options and process each option.
                    803:  * This function is separate from ip6_hopopts_input() in order to
                    804:  * handle a case where the sending node itself process its hop-by-hop
                    805:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    806:  *
                    807:  * The function assumes that hbh header is located right after the IPv6 header
                    808:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    809:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    810:  */
                    811: int
                    812: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    813:        struct mbuf *m;
                    814:        u_int8_t *opthead;
                    815:        int hbhlen;
1.5       itojun    816:        u_int32_t *rtalertp;
1.2       itojun    817:        u_int32_t *plenp;
                    818: {
                    819:        struct ip6_hdr *ip6;
                    820:        int optlen = 0;
                    821:        u_int8_t *opt = opthead;
                    822:        u_int16_t rtalert_val;
1.22      itojun    823:        u_int32_t jumboplen;
1.55      itojun    824:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    825:
                    826:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    827:                switch (*opt) {
                    828:                case IP6OPT_PAD1:
                    829:                        optlen = 1;
                    830:                        break;
                    831:                case IP6OPT_PADN:
                    832:                        if (hbhlen < IP6OPT_MINLEN) {
                    833:                                ip6stat.ip6s_toosmall++;
                    834:                                goto bad;
                    835:                        }
                    836:                        optlen = *(opt + 1) + 2;
                    837:                        break;
                    838:                case IP6OPT_RTALERT:
                    839:                        /* XXX may need check for alignment */
                    840:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    841:                                ip6stat.ip6s_toosmall++;
                    842:                                goto bad;
                    843:                        }
                    844:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    845:                                /* XXX stat */
                    846:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    847:                                    ICMP6_PARAMPROB_HEADER,
                    848:                                    erroff + opt + 1 - opthead);
                    849:                                return (-1);
1.35      itojun    850:                        }
                    851:                        optlen = IP6OPT_RTALERT_LEN;
                    852:                        bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    853:                        *rtalertp = ntohs(rtalert_val);
                    854:                        break;
                    855:                case IP6OPT_JUMBO:
1.22      itojun    856:                        /* XXX may need check for alignment */
                    857:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    858:                                ip6stat.ip6s_toosmall++;
                    859:                                goto bad;
                    860:                        }
1.35      itojun    861:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    862:                                /* XXX stat */
                    863:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    864:                                    ICMP6_PARAMPROB_HEADER,
                    865:                                    erroff + opt + 1 - opthead);
                    866:                                return (-1);
1.35      itojun    867:                        }
1.22      itojun    868:                        optlen = IP6OPT_JUMBO_LEN;
                    869:
                    870:                        /*
                    871:                         * IPv6 packets that have non 0 payload length
1.35      itojun    872:                         * must not contain a jumbo payload option.
1.22      itojun    873:                         */
                    874:                        ip6 = mtod(m, struct ip6_hdr *);
                    875:                        if (ip6->ip6_plen) {
                    876:                                ip6stat.ip6s_badoptions++;
                    877:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    878:                                    ICMP6_PARAMPROB_HEADER,
                    879:                                    erroff + opt - opthead);
                    880:                                return (-1);
1.22      itojun    881:                        }
1.2       itojun    882:
1.22      itojun    883:                        /*
                    884:                         * We may see jumbolen in unaligned location, so
                    885:                         * we'd need to perform bcopy().
                    886:                         */
                    887:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    888:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    889:
                    890: #if 1
                    891:                        /*
                    892:                         * if there are multiple jumbo payload options,
                    893:                         * *plenp will be non-zero and the packet will be
                    894:                         * rejected.
                    895:                         * the behavior may need some debate in ipngwg -
                    896:                         * multiple options does not make sense, however,
                    897:                         * there's no explicit mention in specification.
                    898:                         */
                    899:                        if (*plenp != 0) {
                    900:                                ip6stat.ip6s_badoptions++;
                    901:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    902:                                    ICMP6_PARAMPROB_HEADER,
                    903:                                    erroff + opt + 2 - opthead);
                    904:                                return (-1);
1.22      itojun    905:                        }
1.8       itojun    906: #endif
1.2       itojun    907:
1.22      itojun    908:                        /*
                    909:                         * jumbo payload length must be larger than 65535.
                    910:                         */
                    911:                        if (jumboplen <= IPV6_MAXPACKET) {
                    912:                                ip6stat.ip6s_badoptions++;
                    913:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    914:                                    ICMP6_PARAMPROB_HEADER,
                    915:                                    erroff + opt + 2 - opthead);
                    916:                                return (-1);
1.22      itojun    917:                        }
                    918:                        *plenp = jumboplen;
                    919:
                    920:                        break;
1.35      itojun    921:                default:                /* unknown option */
                    922:                        if (hbhlen < IP6OPT_MINLEN) {
                    923:                                ip6stat.ip6s_toosmall++;
                    924:                                goto bad;
                    925:                        }
1.55      itojun    926:                        optlen = ip6_unknown_opt(opt, m,
                    927:                            erroff + opt - opthead);
                    928:                        if (optlen == -1)
                    929:                                return (-1);
1.35      itojun    930:                        optlen += 2;
                    931:                        break;
1.2       itojun    932:                }
                    933:        }
                    934:
1.55      itojun    935:        return (0);
1.2       itojun    936:
                    937:   bad:
                    938:        m_freem(m);
1.55      itojun    939:        return (-1);
1.2       itojun    940: }
                    941:
                    942: /*
                    943:  * Unknown option processing.
                    944:  * The third argument `off' is the offset from the IPv6 header to the option,
                    945:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    946:  * is not continuous in order to return an ICMPv6 error.
                    947:  */
                    948: int
                    949: ip6_unknown_opt(optp, m, off)
                    950:        u_int8_t *optp;
                    951:        struct mbuf *m;
                    952:        int off;
                    953: {
                    954:        struct ip6_hdr *ip6;
                    955:
1.35      itojun    956:        switch (IP6OPT_TYPE(*optp)) {
                    957:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun    958:                return ((int)*(optp + 1));
1.35      itojun    959:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                    960:                m_freem(m);
1.58      itojun    961:                return (-1);
1.35      itojun    962:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    963:                ip6stat.ip6s_badoptions++;
                    964:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun    965:                return (-1);
1.35      itojun    966:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    967:                ip6stat.ip6s_badoptions++;
                    968:                ip6 = mtod(m, struct ip6_hdr *);
                    969:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    970:                    (m->m_flags & (M_BCAST|M_MCAST)))
                    971:                        m_freem(m);
                    972:                else
                    973:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    974:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun    975:                return (-1);
1.2       itojun    976:        }
                    977:
                    978:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun    979:        return (-1);
1.2       itojun    980: }
                    981:
                    982: /*
1.9       itojun    983:  * Create the "control" list for this pcb.
                    984:  *
                    985:  * The routine will be called from upper layer handlers like tcp6_input().
                    986:  * Thus the routine assumes that the caller (tcp6_input) have already
                    987:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                    988:  * very first mbuf on the mbuf chain.
                    989:  * We may want to add some infinite loop prevention or sanity checks for safety.
                    990:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                    991:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun    992:  */
                    993: void
                    994: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun    995:        struct in6pcb *in6p;
                    996:        struct mbuf **mp;
                    997:        struct ip6_hdr *ip6;
                    998:        struct mbuf *m;
1.2       itojun    999: {
                   1000:        struct proc *p = curproc;       /* XXX */
1.9       itojun   1001:        int privileged;
1.2       itojun   1002:
1.9       itojun   1003:        privileged = 0;
                   1004:        if (p && !suser(p->p_ucred, &p->p_acflag))
                   1005:                privileged++;
                   1006:
                   1007: #ifdef SO_TIMESTAMP
1.2       itojun   1008:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1009:                struct timeval tv;
                   1010:
                   1011:                microtime(&tv);
                   1012:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1.63      itojun   1013:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1014:                if (*mp)
                   1015:                        mp = &(*mp)->m_next;
                   1016:        }
1.9       itojun   1017: #endif
1.73.2.1.2.1! riz      1018:
        !          1019:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
        !          1020:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) !=3D IPV6_VERSION)
        !          1021:                return;
        !          1022:
1.2       itojun   1023:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                   1024:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
1.63      itojun   1025:                    sizeof(struct in6_addr), IPV6_RECVDSTADDR, IPPROTO_IPV6);
1.2       itojun   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,
1.63      itojun   1049:                    sizeof(struct in6_pktinfo), IPV6_PKTINFO, IPPROTO_IPV6);
1.2       itojun   1050:                if (*mp)
                   1051:                        mp = &(*mp)->m_next;
                   1052:        }
                   1053:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1054:                int hlim = ip6->ip6_hlim & 0xff;
1.63      itojun   1055:                *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
                   1056:                    IPV6_HOPLIMIT, IPPROTO_IPV6);
1.2       itojun   1057:                if (*mp)
                   1058:                        mp = &(*mp)->m_next;
                   1059:        }
                   1060:        /* IN6P_NEXTHOP - for outgoing packet only */
                   1061:
                   1062:        /*
                   1063:         * IPV6_HOPOPTS socket option. We require super-user privilege
                   1064:         * for the option, but it might be too strict, since there might
                   1065:         * be some hop-by-hop options which can be returned to normal user.
                   1066:         * See RFC 2292 section 6.
                   1067:         */
1.35      itojun   1068:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1.2       itojun   1069:                /*
                   1070:                 * Check if a hop-by-hop options header is contatined in the
                   1071:                 * received packet, and if so, store the options as ancillary
                   1072:                 * data. Note that a hop-by-hop options header must be
                   1073:                 * just after the IPv6 header, which fact is assured through
                   1074:                 * the IPv6 input processing.
                   1075:                 */
                   1076:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1077:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1078:                        struct ip6_hbh *hbh;
                   1079:                        int hbhlen;
1.62      itojun   1080:                        struct mbuf *ext;
1.9       itojun   1081:
1.62      itojun   1082:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
                   1083:                            ip6->ip6_nxt);
                   1084:                        if (ext == NULL) {
1.9       itojun   1085:                                ip6stat.ip6s_tooshort++;
                   1086:                                return;
                   1087:                        }
1.62      itojun   1088:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1089:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1090:                        if (hbhlen != ext->m_len) {
                   1091:                                m_freem(ext);
1.9       itojun   1092:                                ip6stat.ip6s_tooshort++;
                   1093:                                return;
                   1094:                        }
1.2       itojun   1095:
                   1096:                        /*
                   1097:                         * XXX: We copy whole the header even if a jumbo
                   1098:                         * payload option is included, which option is to
                   1099:                         * be removed before returning in the RFC 2292.
                   1100:                         * But it's too painful operation...
                   1101:                         */
1.9       itojun   1102:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.63      itojun   1103:                            IPV6_HOPOPTS, IPPROTO_IPV6);
1.2       itojun   1104:                        if (*mp)
                   1105:                                mp = &(*mp)->m_next;
1.62      itojun   1106:                        m_freem(ext);
1.2       itojun   1107:                }
                   1108:        }
                   1109:
                   1110:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1111:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1112:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1.60      simonb   1113:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1114:
                   1115:                /*
                   1116:                 * Search for destination options headers or routing
                   1117:                 * header(s) through the header chain, and stores each
                   1118:                 * header as ancillary data.
                   1119:                 * Note that the order of the headers remains in
                   1120:                 * the chain of ancillary data.
                   1121:                 */
1.35      itojun   1122:                while (1) {     /* is explicit loop prevention necessary? */
1.62      itojun   1123:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1124:                        int elen;
1.62      itojun   1125:                        struct mbuf *ext = NULL;
1.9       itojun   1126:
1.62      itojun   1127:                        /*
                   1128:                         * if it is not an extension header, don't try to
                   1129:                         * pull it from the chain.
                   1130:                         */
                   1131:                        switch (nxt) {
                   1132:                        case IPPROTO_DSTOPTS:
                   1133:                        case IPPROTO_ROUTING:
                   1134:                        case IPPROTO_HOPOPTS:
                   1135:                        case IPPROTO_AH: /* is it possible? */
                   1136:                                break;
                   1137:                        default:
                   1138:                                goto loopend;
                   1139:                        }
                   1140:
                   1141:                        ext = ip6_pullexthdr(m, off, nxt);
                   1142:                        if (ext == NULL) {
1.9       itojun   1143:                                ip6stat.ip6s_tooshort++;
                   1144:                                return;
                   1145:                        }
1.62      itojun   1146:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1147:                        if (nxt == IPPROTO_AH)
                   1148:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1149:                        else
                   1150:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1151:                        if (elen != ext->m_len) {
                   1152:                                m_freem(ext);
1.9       itojun   1153:                                ip6stat.ip6s_tooshort++;
                   1154:                                return;
                   1155:                        }
1.57      thorpej  1156:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1157:
1.35      itojun   1158:                        switch (nxt) {
1.62      itojun   1159:                        case IPPROTO_DSTOPTS:
1.35      itojun   1160:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1161:                                        break;
                   1162:
                   1163:                                /*
                   1164:                                 * We also require super-user privilege for
                   1165:                                 * the option.
                   1166:                                 * See the comments on IN6_HOPOPTS.
                   1167:                                 */
                   1168:                                if (!privileged)
                   1169:                                        break;
                   1170:
                   1171:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63      itojun   1172:                                    IPV6_DSTOPTS, IPPROTO_IPV6);
1.35      itojun   1173:                                if (*mp)
                   1174:                                        mp = &(*mp)->m_next;
                   1175:                                break;
                   1176:
                   1177:                        case IPPROTO_ROUTING:
                   1178:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1179:                                        break;
                   1180:
                   1181:                                *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.63      itojun   1182:                                    IPV6_RTHDR, IPPROTO_IPV6);
1.35      itojun   1183:                                if (*mp)
                   1184:                                        mp = &(*mp)->m_next;
                   1185:                                break;
                   1186:
1.62      itojun   1187:                        case IPPROTO_HOPOPTS:
                   1188:                        case IPPROTO_AH: /* is it possible? */
                   1189:                                break;
                   1190:
1.35      itojun   1191:                        default:
                   1192:                                /*
1.62      itojun   1193:                                 * other cases have been filtered in the above.
                   1194:                                 * none will visit this case.  here we supply
                   1195:                                 * the code just in case (nxt overwritten or
                   1196:                                 * other cases).
1.35      itojun   1197:                                 */
1.62      itojun   1198:                                m_freem(ext);
1.35      itojun   1199:                                goto loopend;
                   1200:
1.2       itojun   1201:                        }
                   1202:
                   1203:                        /* proceed with the next header. */
1.9       itojun   1204:                        off += elen;
1.2       itojun   1205:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1206:                        ip6e = NULL;
                   1207:                        m_freem(ext);
                   1208:                        ext = NULL;
1.2       itojun   1209:                }
                   1210:          loopend:
1.62      itojun   1211:                ;
1.2       itojun   1212:        }
1.62      itojun   1213: }
                   1214:
                   1215: /*
                   1216:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1217:  * contains the result, or NULL on error.
                   1218:  */
                   1219: static struct mbuf *
                   1220: ip6_pullexthdr(m, off, nxt)
                   1221:        struct mbuf *m;
                   1222:        size_t off;
                   1223:        int nxt;
                   1224: {
                   1225:        struct ip6_ext ip6e;
                   1226:        size_t elen;
                   1227:        struct mbuf *n;
                   1228:
                   1229: #ifdef DIAGNOSTIC
                   1230:        switch (nxt) {
                   1231:        case IPPROTO_DSTOPTS:
                   1232:        case IPPROTO_ROUTING:
                   1233:        case IPPROTO_HOPOPTS:
                   1234:        case IPPROTO_AH: /* is it possible? */
                   1235:                break;
                   1236:        default:
                   1237:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1238:        }
1.62      itojun   1239: #endif
1.2       itojun   1240:
1.62      itojun   1241:        m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1242:        if (nxt == IPPROTO_AH)
                   1243:                elen = (ip6e.ip6e_len + 2) << 2;
                   1244:        else
                   1245:                elen = (ip6e.ip6e_len + 1) << 3;
                   1246:
                   1247:        MGET(n, M_DONTWAIT, MT_DATA);
                   1248:        if (n && elen >= MLEN) {
                   1249:                MCLGET(n, M_DONTWAIT);
                   1250:                if ((n->m_flags & M_EXT) == 0) {
                   1251:                        m_free(n);
                   1252:                        n = NULL;
                   1253:                }
                   1254:        }
                   1255:        if (!n)
                   1256:                return NULL;
                   1257:
                   1258:        n->m_len = 0;
                   1259:        if (elen >= M_TRAILINGSPACE(n)) {
                   1260:                m_free(n);
                   1261:                return NULL;
                   1262:        }
                   1263:
                   1264:        m_copydata(m, off, elen, mtod(n, caddr_t));
                   1265:        n->m_len = elen;
                   1266:        return n;
1.2       itojun   1267: }
                   1268:
                   1269: /*
                   1270:  * Get pointer to the previous header followed by the header
                   1271:  * currently processed.
                   1272:  * XXX: This function supposes that
                   1273:  *     M includes all headers,
                   1274:  *     the next header field and the header length field of each header
                   1275:  *     are valid, and
                   1276:  *     the sum of each header length equals to OFF.
                   1277:  * Because of these assumptions, this function must be called very
                   1278:  * carefully. Moreover, it will not be used in the near future when
                   1279:  * we develop `neater' mechanism to process extension headers.
                   1280:  */
1.58      itojun   1281: u_int8_t *
1.2       itojun   1282: ip6_get_prevhdr(m, off)
                   1283:        struct mbuf *m;
                   1284:        int off;
                   1285: {
                   1286:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1287:
                   1288:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1289:                return (&ip6->ip6_nxt);
1.2       itojun   1290:        else {
                   1291:                int len, nxt;
                   1292:                struct ip6_ext *ip6e = NULL;
                   1293:
                   1294:                nxt = ip6->ip6_nxt;
                   1295:                len = sizeof(struct ip6_hdr);
                   1296:                while (len < off) {
                   1297:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1298:
1.35      itojun   1299:                        switch (nxt) {
1.2       itojun   1300:                        case IPPROTO_FRAGMENT:
                   1301:                                len += sizeof(struct ip6_frag);
                   1302:                                break;
                   1303:                        case IPPROTO_AH:
                   1304:                                len += (ip6e->ip6e_len + 2) << 2;
                   1305:                                break;
                   1306:                        default:
                   1307:                                len += (ip6e->ip6e_len + 1) << 3;
                   1308:                                break;
                   1309:                        }
                   1310:                        nxt = ip6e->ip6e_nxt;
                   1311:                }
                   1312:                if (ip6e)
1.58      itojun   1313:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1314:                else
                   1315:                        return NULL;
1.18      itojun   1316:        }
                   1317: }
                   1318:
                   1319: /*
                   1320:  * get next header offset.  m will be retained.
                   1321:  */
                   1322: int
                   1323: ip6_nexthdr(m, off, proto, nxtp)
                   1324:        struct mbuf *m;
                   1325:        int off;
                   1326:        int proto;
                   1327:        int *nxtp;
                   1328: {
                   1329:        struct ip6_hdr ip6;
                   1330:        struct ip6_ext ip6e;
                   1331:        struct ip6_frag fh;
                   1332:
                   1333:        /* just in case */
                   1334:        if (m == NULL)
                   1335:                panic("ip6_nexthdr: m == NULL");
                   1336:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1337:                return -1;
                   1338:
                   1339:        switch (proto) {
                   1340:        case IPPROTO_IPV6:
                   1341:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1342:                        return -1;
                   1343:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1344:                if (nxtp)
                   1345:                        *nxtp = ip6.ip6_nxt;
                   1346:                off += sizeof(ip6);
                   1347:                return off;
                   1348:
                   1349:        case IPPROTO_FRAGMENT:
                   1350:                /*
                   1351:                 * terminate parsing if it is not the first fragment,
                   1352:                 * it does not make sense to parse through it.
                   1353:                 */
                   1354:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1355:                        return -1;
                   1356:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1.67      itojun   1357:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1358:                        return -1;
                   1359:                if (nxtp)
                   1360:                        *nxtp = fh.ip6f_nxt;
                   1361:                off += sizeof(struct ip6_frag);
                   1362:                return off;
                   1363:
                   1364:        case IPPROTO_AH:
                   1365:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1366:                        return -1;
                   1367:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1368:                if (nxtp)
                   1369:                        *nxtp = ip6e.ip6e_nxt;
                   1370:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1371:                if (m->m_pkthdr.len < off)
                   1372:                        return -1;
1.18      itojun   1373:                return off;
                   1374:
                   1375:        case IPPROTO_HOPOPTS:
                   1376:        case IPPROTO_ROUTING:
                   1377:        case IPPROTO_DSTOPTS:
                   1378:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1379:                        return -1;
                   1380:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1381:                if (nxtp)
                   1382:                        *nxtp = ip6e.ip6e_nxt;
                   1383:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1384:                if (m->m_pkthdr.len < off)
                   1385:                        return -1;
1.18      itojun   1386:                return off;
                   1387:
                   1388:        case IPPROTO_NONE:
                   1389:        case IPPROTO_ESP:
                   1390:        case IPPROTO_IPCOMP:
                   1391:                /* give up */
                   1392:                return -1;
                   1393:
                   1394:        default:
                   1395:                return -1;
                   1396:        }
                   1397: }
                   1398:
                   1399: /*
                   1400:  * get offset for the last header in the chain.  m will be kept untainted.
                   1401:  */
                   1402: int
                   1403: ip6_lasthdr(m, off, proto, nxtp)
                   1404:        struct mbuf *m;
                   1405:        int off;
                   1406:        int proto;
                   1407:        int *nxtp;
                   1408: {
                   1409:        int newoff;
                   1410:        int nxt;
                   1411:
                   1412:        if (!nxtp) {
                   1413:                nxt = -1;
                   1414:                nxtp = &nxt;
                   1415:        }
                   1416:        while (1) {
                   1417:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1418:                if (newoff < 0)
                   1419:                        return off;
                   1420:                else if (newoff < off)
                   1421:                        return -1;      /* invalid */
                   1422:                else if (newoff == off)
                   1423:                        return newoff;
                   1424:
                   1425:                off = newoff;
                   1426:                proto = *nxtp;
1.2       itojun   1427:        }
                   1428: }
                   1429:
                   1430: /*
                   1431:  * System control for IP6
                   1432:  */
                   1433:
                   1434: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1435:        0,              0,              0,              0,
                   1436:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1437:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1438:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1439:        0,              0,              0,              0,
                   1440:        ENOPROTOOPT
                   1441: };
                   1442:
1.70      atatat   1443: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2       itojun   1444: {
1.26      itojun   1445:
1.73      atatat   1446:        sysctl_createv(clog, 0, NULL, NULL,
                   1447:                       CTLFLAG_PERMANENT,
1.70      atatat   1448:                       CTLTYPE_NODE, "net", NULL,
                   1449:                       NULL, 0, NULL, 0,
                   1450:                       CTL_NET, CTL_EOL);
1.73      atatat   1451:        sysctl_createv(clog, 0, NULL, NULL,
                   1452:                       CTLFLAG_PERMANENT,
1.73.2.1  tron     1453:                       CTLTYPE_NODE, "inet6",
                   1454:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1455:                       NULL, 0, NULL, 0,
                   1456:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1457:        sysctl_createv(clog, 0, NULL, NULL,
                   1458:                       CTLFLAG_PERMANENT,
1.73.2.1  tron     1459:                       CTLTYPE_NODE, "ip6",
                   1460:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1461:                       NULL, 0, NULL, 0,
                   1462:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1463:
1.73      atatat   1464:        sysctl_createv(clog, 0, NULL, NULL,
                   1465:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1466:                       CTLTYPE_INT, "forwarding",
                   1467:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1468:                       NULL, 0, &ip6_forwarding, 0,
                   1469:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1470:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1471:        sysctl_createv(clog, 0, NULL, NULL,
                   1472:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1473:                       CTLTYPE_INT, "redirect",
                   1474:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1475:                       NULL, 0, &ip6_sendredirects, 0,
                   1476:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1477:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1478:        sysctl_createv(clog, 0, NULL, NULL,
                   1479:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1480:                       CTLTYPE_INT, "hlim",
                   1481:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1482:                       NULL, 0, &ip6_defhlim, 0,
                   1483:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1484:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1485: #ifdef notyet
1.73      atatat   1486:        sysctl_createv(clog, 0, NULL, NULL,
                   1487:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1488:                       CTLTYPE_INT, "mtu", NULL,
                   1489:                       NULL, 0, &, 0,
                   1490:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1491:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1492: #endif
                   1493: #ifdef __no_idea__
1.73      atatat   1494:        sysctl_createv(clog, 0, NULL, NULL,
                   1495:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1496:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1497:                       NULL, 0, &?, 0,
                   1498:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1499:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1500:        sysctl_createv(clog, 0, NULL, NULL,
                   1501:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1502:                       CTLTYPE_STRUCT, "stats", NULL,
                   1503:                       NULL, 0, &?, sizeof(?),
                   1504:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1505:                       IPV6CTL_STATS, CTL_EOL);
1.73      atatat   1506:        sysctl_createv(clog, 0, NULL, NULL,
                   1507:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1508:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1509:                       NULL, 0, &?, sizeof(?),
                   1510:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1511:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1512:        sysctl_createv(clog, 0, NULL, NULL,
                   1513:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1514:                       CTLTYPE_?, "mrtproto", NULL,
                   1515:                       NULL, 0, &?, sizeof(?),
                   1516:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1517:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1518: #endif
1.73      atatat   1519:        sysctl_createv(clog, 0, NULL, NULL,
                   1520:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1521:                       CTLTYPE_INT, "maxfragpackets",
                   1522:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1523:                                    "for reassembly"),
1.70      atatat   1524:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1525:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1526:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1527: #ifdef __no_idea__
1.73      atatat   1528:        sysctl_createv(clog, 0, NULL, NULL,
                   1529:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1530:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1531:                       NULL, 0, &?, 0,
                   1532:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1533:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1534:        sysctl_createv(clog, 0, NULL, NULL,
                   1535:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1536:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1537:                       NULL, 0, &?, 0,
                   1538:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1539:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1540: #endif
1.73      atatat   1541:        sysctl_createv(clog, 0, NULL, NULL,
                   1542:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1543:                       CTLTYPE_INT, "accept_rtadv",
                   1544:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1545:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1546:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1547:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1548:        sysctl_createv(clog, 0, NULL, NULL,
                   1549:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1550:                       CTLTYPE_INT, "keepfaith",
                   1551:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1552:                       NULL, 0, &ip6_keepfaith, 0,
                   1553:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1554:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1555:        sysctl_createv(clog, 0, NULL, NULL,
                   1556:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1557:                       CTLTYPE_INT, "log_interval",
                   1558:                       SYSCTL_DESCR("Minumum interval between logging "
                   1559:                                    "unroutable packets"),
1.70      atatat   1560:                       NULL, 0, &ip6_log_interval, 0,
                   1561:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1562:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1563:        sysctl_createv(clog, 0, NULL, NULL,
                   1564:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1565:                       CTLTYPE_INT, "hdrnestlimit",
                   1566:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1567:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1568:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1569:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1570:        sysctl_createv(clog, 0, NULL, NULL,
                   1571:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1572:                       CTLTYPE_INT, "dad_count",
                   1573:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1574:                                    "probes to send"),
1.70      atatat   1575:                       NULL, 0, &ip6_dad_count, 0,
                   1576:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1577:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1578:        sysctl_createv(clog, 0, NULL, NULL,
                   1579:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1580:                       CTLTYPE_INT, "auto_flowlabel",
                   1581:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1582:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1583:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1584:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1585:        sysctl_createv(clog, 0, NULL, NULL,
                   1586:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1587:                       CTLTYPE_INT, "defmcasthlim",
                   1588:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1589:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1590:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1591:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1592: #if NGIF > 0
1.73      atatat   1593:        sysctl_createv(clog, 0, NULL, NULL,
                   1594:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1595:                       CTLTYPE_INT, "gifhlim",
                   1596:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1597:                       NULL, 0, &ip6_gif_hlim, 0,
                   1598:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1599:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1600: #endif /* NGIF */
1.73      atatat   1601:        sysctl_createv(clog, 0, NULL, NULL,
                   1602:                       CTLFLAG_PERMANENT,
1.73.2.1  tron     1603:                       CTLTYPE_STRING, "kame_version",
                   1604:                       SYSCTL_DESCR("KAME Version"),
1.70      atatat   1605:                       NULL, 0, __KAME_VERSION, 0,
                   1606:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1607:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1608:        sysctl_createv(clog, 0, NULL, NULL,
                   1609:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1610:                       CTLTYPE_INT, "use_deprecated",
                   1611:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1612:                                    "source addresses"),
1.70      atatat   1613:                       NULL, 0, &ip6_use_deprecated, 0,
                   1614:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1615:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1616:        sysctl_createv(clog, 0, NULL, NULL,
                   1617:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1618:                       CTLTYPE_INT, "rr_prune", NULL,
                   1619:                       NULL, 0, &ip6_rr_prune, 0,
                   1620:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1621:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1622:        sysctl_createv(clog, 0, NULL, NULL,
                   1623:                       CTLFLAG_PERMANENT
1.70      atatat   1624: #ifndef INET6_BINDV6ONLY
1.73      atatat   1625:                       |CTLFLAG_READWRITE,
1.70      atatat   1626: #endif
1.73.2.1  tron     1627:                       CTLTYPE_INT, "v6only",
                   1628:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1629:                                    "to PF_INET sockets"),
1.70      atatat   1630:                       NULL, 0, &ip6_v6only, 0,
                   1631:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1632:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1633:        sysctl_createv(clog, 0, NULL, NULL,
                   1634:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1635:                       CTLTYPE_INT, "anonportmin",
                   1636:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1637:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1638:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1639:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1640:        sysctl_createv(clog, 0, NULL, NULL,
                   1641:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1642:                       CTLTYPE_INT, "anonportmax",
                   1643:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1644:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1645:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1646:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1647: #ifndef IPNOPRIVPORTS
1.73      atatat   1648:        sysctl_createv(clog, 0, NULL, NULL,
                   1649:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1650:                       CTLTYPE_INT, "lowportmin",
                   1651:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1652:                                    "to assign"),
1.70      atatat   1653:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1654:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1655:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1656:        sysctl_createv(clog, 0, NULL, NULL,
                   1657:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1658:                       CTLTYPE_INT, "lowportmax",
                   1659:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1660:                                    "to assign"),
1.70      atatat   1661:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1662:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1663:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1664: #endif /* IPNOPRIVPORTS */
1.73      atatat   1665:        sysctl_createv(clog, 0, NULL, NULL,
                   1666:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.73.2.1  tron     1667:                       CTLTYPE_INT, "maxfrags",
                   1668:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1669:                       NULL, 0, &ip6_maxfrags, 0,
                   1670:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1671:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.2       itojun   1672: }

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