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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.116

1.116   ! thorpej     1: /*     $NetBSD: ip6_input.c,v 1.115 2008/04/08 23:37:43 thorpej Exp $  */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
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>
1.116   ! thorpej    65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.115 2008/04/08 23:37:43 thorpej Exp $");
1.2       itojun     66:
                     67: #include "opt_inet.h"
1.85      rpaulo     68: #include "opt_inet6.h"
1.4       thorpej    69: #include "opt_ipsec.h"
1.15      darrenr    70: #include "opt_pfil_hooks.h"
1.2       itojun     71:
                     72: #include <sys/param.h>
                     73: #include <sys/systm.h>
                     74: #include <sys/malloc.h>
                     75: #include <sys/mbuf.h>
                     76: #include <sys/domain.h>
                     77: #include <sys/protosw.h>
                     78: #include <sys/socket.h>
                     79: #include <sys/socketvar.h>
                     80: #include <sys/errno.h>
                     81: #include <sys/time.h>
                     82: #include <sys/kernel.h>
                     83: #include <sys/syslog.h>
                     84: #include <sys/proc.h>
1.46      simonb     85: #include <sys/sysctl.h>
1.2       itojun     86:
                     87: #include <net/if.h>
                     88: #include <net/if_types.h>
                     89: #include <net/if_dl.h>
                     90: #include <net/route.h>
                     91: #include <net/netisr.h>
1.15      darrenr    92: #ifdef PFIL_HOOKS
                     93: #include <net/pfil.h>
                     94: #endif
1.2       itojun     95:
                     96: #include <netinet/in.h>
1.9       itojun     97: #include <netinet/in_systm.h>
                     98: #ifdef INET
                     99: #include <netinet/ip.h>
                    100: #include <netinet/ip_icmp.h>
1.45      itojun    101: #endif /* INET */
1.14      itojun    102: #include <netinet/ip6.h>
1.2       itojun    103: #include <netinet6/in6_var.h>
1.11      itojun    104: #include <netinet6/ip6_var.h>
1.116   ! thorpej   105: #include <netinet6/ip6_private.h>
1.2       itojun    106: #include <netinet6/in6_pcb.h>
1.14      itojun    107: #include <netinet/icmp6.h>
1.81      rpaulo    108: #include <netinet6/scope6_var.h>
1.2       itojun    109: #include <netinet6/in6_ifattach.h>
                    110: #include <netinet6/nd6.h>
                    111:
1.37      itojun    112: #ifdef IPSEC
                    113: #include <netinet6/ipsec.h>
                    114: #endif
                    115:
1.94      degroote  116: #ifdef FAST_IPSEC
                    117: #include <netipsec/ipsec.h>
                    118: #include <netipsec/ipsec6.h>
                    119: #include <netipsec/key.h>
                    120: #endif /* FAST_IPSEC */
                    121:
1.2       itojun    122: #include <netinet6/ip6protosw.h>
                    123:
                    124: #include "faith.h"
                    125: #include "gif.h"
1.50      itojun    126:
                    127: #if NGIF > 0
                    128: #include <netinet6/in6_gif.h>
                    129: #endif
1.2       itojun    130:
1.9       itojun    131: #include <net/net_osdep.h>
                    132:
1.2       itojun    133: extern struct domain inet6domain;
                    134:
                    135: u_char ip6_protox[IPPROTO_MAX];
                    136: static int ip6qmaxlen = IFQ_MAXLEN;
                    137: struct in6_ifaddr *in6_ifaddr;
                    138: struct ifqueue ip6intrq;
                    139:
1.108     ad        140: extern callout_t in6_tmpaddrtimer_ch;
1.83      rpaulo    141:
1.2       itojun    142: int ip6_forward_srcrt;                 /* XXX */
                    143: int ip6_sourcecheck;                   /* XXX */
                    144: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    145:
1.29      thorpej   146: #ifdef PFIL_HOOKS
                    147: struct pfil_head inet6_pfil_hook;
                    148: #endif
                    149:
1.116   ! thorpej   150: percpu_t *ip6stat_percpu;
1.2       itojun    151:
1.111     dyoung    152: static void ip6_init2(void *);
1.112     dyoung    153: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    154:
1.111     dyoung    155: static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
                    156: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.2       itojun    157:
                    158: /*
                    159:  * IP6 initialization: fill in IP6 protocol switch table.
                    160:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    161:  */
                    162: void
1.114     matt      163: ip6_init(void)
1.2       itojun    164: {
1.78      christos  165:        const struct ip6protosw *pr;
1.35      itojun    166:        int i;
1.2       itojun    167:
1.78      christos  168:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    169:        if (pr == 0)
                    170:                panic("ip6_init");
                    171:        for (i = 0; i < IPPROTO_MAX; i++)
                    172:                ip6_protox[i] = pr - inet6sw;
1.78      christos  173:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    174:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    175:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    176:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    177:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    178:        ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81      rpaulo    179:        scope6_init();
                    180:        addrsel_policy_init();
1.2       itojun    181:        nd6_init();
                    182:        frag6_init();
1.83      rpaulo    183:        ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    184:
                    185:        ip6_init2((void *)0);
1.98      liamjfoy  186: #ifdef GATEWAY
1.99      liamjfoy  187:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  188: #endif
1.29      thorpej   189:
                    190: #ifdef PFIL_HOOKS
                    191:        /* Register our Packet Filter hook. */
1.33      thorpej   192:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    193:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   194:        i = pfil_head_register(&inet6_pfil_hook);
                    195:        if (i != 0)
                    196:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    197:                    "error %d\n", i);
                    198: #endif /* PFIL_HOOKS */
1.116   ! thorpej   199:
        !           200:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2       itojun    201: }
                    202:
                    203: static void
1.90      christos  204: ip6_init2(void *dummy)
1.2       itojun    205: {
                    206:
                    207:        /* nd6_timer_init */
1.108     ad        208:        callout_init(&nd6_timer_ch, 0);
1.19      thorpej   209:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    210:
                    211:        /* timer for regeneranation of temporary addresses randomize ID */
1.108     ad        212:        callout_init(&in6_tmpaddrtimer_ch, 0);
1.83      rpaulo    213:        callout_reset(&in6_tmpaddrtimer_ch,
                    214:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    215:                       ip6_temp_regen_advance) * hz,
                    216:                      in6_tmpaddrtimer, NULL);
1.2       itojun    217: }
                    218:
                    219: /*
                    220:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    221:  */
                    222: void
1.114     matt      223: ip6intr(void)
1.2       itojun    224: {
                    225:        int s;
                    226:        struct mbuf *m;
                    227:
                    228:        for (;;) {
1.41      thorpej   229:                s = splnet();
1.2       itojun    230:                IF_DEQUEUE(&ip6intrq, m);
                    231:                splx(s);
                    232:                if (m == 0)
                    233:                        return;
1.83      rpaulo    234:                /* drop the packet if IPv6 operation is disabled on the IF */
                    235:                if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    236:                        m_freem(m);
                    237:                        return;
                    238:                }
1.2       itojun    239:                ip6_input(m);
                    240:        }
                    241: }
                    242:
1.103     dyoung    243: extern struct  route ip6_forward_rt;
1.2       itojun    244:
                    245: void
1.96      dyoung    246: ip6_input(struct mbuf *m)
1.2       itojun    247: {
1.9       itojun    248:        struct ip6_hdr *ip6;
1.105     dyoung    249:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    250:        u_int32_t plen;
1.5       itojun    251:        u_int32_t rtalert = ~0;
1.104     yamt      252:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    253:        struct ifnet *deliverifp = NULL;
1.64      itojun    254:        int srcrt = 0;
1.105     dyoung    255:        const struct rtentry *rt;
                    256:        union {
                    257:                struct sockaddr         dst;
                    258:                struct sockaddr_in6     dst6;
                    259:        } u;
1.94      degroote  260: #ifdef FAST_IPSEC
                    261:        struct m_tag *mtag;
                    262:        struct tdb_ident *tdbi;
                    263:        struct secpolicy *sp;
                    264:        int s, error;
                    265: #endif
1.2       itojun    266:
                    267: #ifdef IPSEC
                    268:        /*
                    269:         * should the inner packet be considered authentic?
                    270:         * see comment in ah4_input().
                    271:         */
1.49      itojun    272:        m->m_flags &= ~M_AUTHIPHDR;
                    273:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    274: #endif
1.9       itojun    275:
1.2       itojun    276:        /*
1.81      rpaulo    277:         * make sure we don't have onion peering information into m_tag.
                    278:         */
                    279:        ip6_delaux(m);
                    280:
                    281:        /*
1.44      itojun    282:         * mbuf statistics
1.2       itojun    283:         */
                    284:        if (m->m_flags & M_EXT) {
                    285:                if (m->m_next)
1.116   ! thorpej   286:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    287:                else
1.116   ! thorpej   288:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    289:        } else {
1.115     thorpej   290: #define M2MMAX 32
1.2       itojun    291:                if (m->m_next) {
1.9       itojun    292:                        if (m->m_flags & M_LOOP) {
1.116   ! thorpej   293:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115     thorpej   294:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116   ! thorpej   295:                                IP6_STATINC(IP6_STAT_M2M +
        !           296:                                            m->m_pkthdr.rcvif->if_index);
1.115     thorpej   297:                        } else
1.116   ! thorpej   298:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    299:                } else
1.116   ! thorpej   300:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    301: #undef M2MMAX
1.2       itojun    302:        }
                    303:
1.9       itojun    304:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116   ! thorpej   305:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    306:
1.57      thorpej   307:        /*
                    308:         * If the IPv6 header is not aligned, slurp it up into a new
                    309:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    310:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   311:         * IPv6 header is in the first mbuf of the chain.
                    312:         */
1.97      christos  313:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   314:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    315:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    316:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    317:                        /* XXXJRT new stat, please */
1.116   ! thorpej   318:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.57      thorpej   319:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    320:                        return;
                    321:                }
                    322:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    323:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    324:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116   ! thorpej   325:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.9       itojun    326:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    327:                        return;
                    328:                }
1.2       itojun    329:        }
                    330:
                    331:        ip6 = mtod(m, struct ip6_hdr *);
                    332:
                    333:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116   ! thorpej   334:                IP6_STATINC(IP6_STAT_BADVERS);
1.9       itojun    335:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    336:                goto bad;
                    337:        }
1.15      darrenr   338:
1.98      liamjfoy  339: #if defined(IPSEC)
                    340:        /* IPv6 fast forwarding is not compatible with IPsec. */
                    341:        m->m_flags &= ~M_CANFASTFWD;
                    342: #else
                    343:        /*
                    344:         * Assume that we can create a fast-forward IP flow entry
                    345:         * based on this packet.
                    346:         */
                    347:        m->m_flags |= M_CANFASTFWD;
                    348: #endif
                    349:
1.15      darrenr   350: #ifdef PFIL_HOOKS
                    351:        /*
                    352:         * Run through list of hooks for input packets.  If there are any
                    353:         * filters which require that additional packets in the flow are
                    354:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    355:         * Note that filters must _never_ set this flag, as another filter
                    356:         * in the list may have previously cleared it.
                    357:         */
1.39      itojun    358:        /*
                    359:         * let ipfilter look at packet on the wire,
                    360:         * not the decapsulated packet.
                    361:         */
                    362: #ifdef IPSEC
1.42      itojun    363:        if (!ipsec_getnhist(m))
1.94      degroote  364: #elif defined(FAST_IPSEC)
                    365:        if (!ipsec_indone(m))
1.39      itojun    366: #else
                    367:        if (1)
                    368: #endif
                    369:        {
1.64      itojun    370:                struct in6_addr odst;
                    371:
                    372:                odst = ip6->ip6_dst;
1.39      itojun    373:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    374:                                   PFIL_IN) != 0)
                    375:                        return;
                    376:                if (m == NULL)
                    377:                        return;
                    378:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    379:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    380:        }
1.15      darrenr   381: #endif /* PFIL_HOOKS */
                    382:
1.116   ! thorpej   383:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    384:
1.30      thorpej   385: #ifdef ALTQ
                    386:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    387:                /* packet is dropped by traffic conditioner */
                    388:                return;
1.9       itojun    389:        }
                    390: #endif
                    391:
1.2       itojun    392:        /*
1.44      itojun    393:         * Check against address spoofing/corruption.
1.2       itojun    394:         */
                    395:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    396:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    397:                /*
                    398:                 * XXX: "badscope" is not very suitable for a multicast source.
                    399:                 */
1.116   ! thorpej   400:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.9       itojun    401:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    402:                goto bad;
                    403:        }
1.13      itojun    404:        /*
1.44      itojun    405:         * The following check is not documented in specs.  A malicious
                    406:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    407:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    408:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    409:         *
1.44      itojun    410:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    411:         * support IPv4-less kernel compilation, we cannot support SIIT
                    412:         * environment at all.  So, it makes more sense for us to reject any
                    413:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       414:         * partial support for SIIT environment.
1.13      itojun    415:         */
                    416:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    417:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116   ! thorpej   418:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    419:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    420:                goto bad;
                    421:        }
1.17      itojun    422: #if 0
1.13      itojun    423:        /*
1.17      itojun    424:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    425:         *
                    426:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    427:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    428:         * is revised to forbid relaying case.
1.13      itojun    429:         */
                    430:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    431:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116   ! thorpej   432:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    433:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    434:                goto bad;
                    435:        }
                    436: #endif
1.35      itojun    437:
1.2       itojun    438:        /*
1.82      yamt      439:         * Disambiguate address scope zones (if there is ambiguity).
                    440:         * We first make sure that the original source or destination address
                    441:         * is not in our internal form for scoped addresses.  Such addresses
                    442:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    443:         * to the usage conflict.
                    444:         * in6_setscope() then also checks and rejects the cases where src or
                    445:         * dst are the loopback address and the receiving interface
                    446:         * is not loopback.
                    447:         */
1.88      bouyer    448:        if (__predict_false(
                    449:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    450:                goto bad;
                    451:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      452:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116   ! thorpej   453:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      454:                goto bad;
                    455:        }
                    456:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    457:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116   ! thorpej   458:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      459:                goto bad;
                    460:        }
                    461:
                    462:        /*
1.2       itojun    463:         * Multicast check
                    464:         */
                    465:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    466:                struct  in6_multi *in6m = 0;
1.9       itojun    467:
                    468:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    469:                /*
                    470:                 * See if we belong to the destination multicast group on the
                    471:                 * arrival interface.
                    472:                 */
                    473:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    474:                if (in6m)
                    475:                        ours = 1;
                    476:                else if (!ip6_mrouter) {
1.116   ! thorpej   477:                        uint64_t *ip6s = IP6_STAT_GETREF();
        !           478:                        ip6s[IP6_STAT_NOTMEMBER]++;
        !           479:                        ip6s[IP6_STAT_CANTFORWARD]++;
        !           480:                        IP6_STAT_PUTREF();
1.9       itojun    481:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    482:                        goto bad;
                    483:                }
1.9       itojun    484:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    485:                goto hbhcheck;
                    486:        }
                    487:
1.105     dyoung    488:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    489:
1.2       itojun    490:        /*
                    491:         *  Unicast check
                    492:         */
1.105     dyoung    493:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
                    494:        if (hit)
1.116   ! thorpej   495:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     496:        else
1.116   ! thorpej   497:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    498:
1.109     dyoung    499: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2       itojun    500:
                    501:        /*
                    502:         * Accept the packet if the forwarding interface to the destination
                    503:         * according to the routing table is the loopback interface,
                    504:         * unless the associated route has a gateway.
                    505:         * Note that this approach causes to accept a packet if there is a
                    506:         * route to the loopback interface for the destination of the packet.
                    507:         * But we think it's even useful in some situations, e.g. when using
                    508:         * a special daemon which wants to intercept the packet.
                    509:         */
1.105     dyoung    510:        if (rt != NULL &&
                    511:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    512:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    513: #if 0
                    514:            /*
                    515:             * The check below is redundant since the comparison of
                    516:             * the destination and the key of the rtentry has
                    517:             * already done through looking up the routing table.
                    518:             */
1.109     dyoung    519:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2       itojun    520: #endif
1.105     dyoung    521:            rt->rt_ifp->if_type == IFT_LOOP) {
                    522:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    523:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    524:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    525:                /*
                    526:                 * packets to a tentative, duplicated, or somehow invalid
                    527:                 * address must not be accepted.
                    528:                 */
1.2       itojun    529:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    530:                        /* this address is ready */
1.2       itojun    531:                        ours = 1;
1.9       itojun    532:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    533:                        goto hbhcheck;
                    534:                } else {
1.24      itojun    535:                        /* address is not ready, so discard the packet. */
1.34      itojun    536:                        nd6log((LOG_INFO,
1.27      itojun    537:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    538:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    539:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    540:
                    541:                        goto bad;
1.2       itojun    542:                }
                    543:        }
                    544:
                    545:        /*
1.55      itojun    546:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    547:         */
                    548: #if defined(NFAITH) && 0 < NFAITH
                    549:        if (ip6_keepfaith) {
1.105     dyoung    550:                if (rt != NULL && rt->rt_ifp != NULL &&
                    551:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    552:                        /* XXX do we need more sanity checks? */
                    553:                        ours = 1;
1.105     dyoung    554:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    555:                        goto hbhcheck;
                    556:                }
                    557:        }
                    558: #endif
                    559:
                    560: #if 0
                    561:     {
                    562:        /*
                    563:         * Last resort: check in6_ifaddr for incoming interface.
                    564:         * The code is here until I update the "goto ours hack" code above
                    565:         * working right.
                    566:         */
                    567:        struct ifaddr *ifa;
1.113     dyoung    568:        IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9       itojun    569:                if (ifa->ifa_addr == NULL)
                    570:                        continue;       /* just for safety */
                    571:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    572:                        continue;
                    573:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    574:                        ours = 1;
                    575:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    576:                        goto hbhcheck;
                    577:                }
                    578:        }
1.9       itojun    579:     }
1.2       itojun    580: #endif
                    581:
                    582:        /*
                    583:         * Now there is no reason to process the packet if it's not our own
                    584:         * and we're not a router.
                    585:         */
                    586:        if (!ip6_forwarding) {
1.116   ! thorpej   587:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9       itojun    588:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    589:                goto bad;
                    590:        }
                    591:
                    592:   hbhcheck:
                    593:        /*
1.81      rpaulo    594:         * record address information into m_tag, if we don't have one yet.
                    595:         * note that we are unable to record it, if the address is not listed
                    596:         * as our interface address (e.g. multicast addresses, addresses
                    597:         * within FAITH prefixes and such).
                    598:         */
1.111     dyoung    599:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    600:                struct in6_ifaddr *ia6;
                    601:
                    602:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111     dyoung    603:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    604:                        /*
                    605:                         * XXX maybe we should drop the packet here,
                    606:                         * as we could not provide enough information
                    607:                         * to the upper layers.
                    608:                         */
1.81      rpaulo    609:                }
                    610:        }
                    611:
                    612:        /*
1.2       itojun    613:         * Process Hop-by-Hop options header if it's contained.
                    614:         * m may be modified in ip6_hopopts_input().
                    615:         * If a JumboPayload option is included, plen will also be modified.
                    616:         */
                    617:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    618:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    619:                struct ip6_hbh *hbh;
                    620:
                    621:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    622: #if 0  /*touches NULL pointer*/
                    623:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    624: #endif
1.2       itojun    625:                        return; /* m have already been freed */
1.9       itojun    626:                }
1.22      itojun    627:
1.2       itojun    628:                /* adjust pointer */
                    629:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    630:
                    631:                /*
1.49      itojun    632:                 * if the payload length field is 0 and the next header field
1.22      itojun    633:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    634:                 * option MUST be included.
                    635:                 */
                    636:                if (ip6->ip6_plen == 0 && plen == 0) {
                    637:                        /*
                    638:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    639:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    640:                         * (non-zero) payload length to the variable plen.
1.22      itojun    641:                         */
1.116   ! thorpej   642:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    643:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    644:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    645:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    646:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  647:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    648:                        return;
                    649:                }
1.9       itojun    650:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    651:                        sizeof(struct ip6_hbh));
                    652:                if (hbh == NULL) {
1.116   ! thorpej   653:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    654:                        return;
                    655:                }
1.57      thorpej   656:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    657:                nxt = hbh->ip6h_nxt;
1.2       itojun    658:
                    659:                /*
                    660:                 * accept the packet if a router alert option is included
                    661:                 * and we act as an IPv6 router.
                    662:                 */
1.5       itojun    663:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    664:                        ours = 1;
                    665:        } else
                    666:                nxt = ip6->ip6_nxt;
                    667:
                    668:        /*
                    669:         * Check that the amount of data in the buffers
                    670:         * is as at least much as the IPv6 header would have us expect.
                    671:         * Trim mbufs if longer than we expect.
                    672:         * Drop packet if shorter than we expect.
                    673:         */
                    674:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116   ! thorpej   675:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    676:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    677:                goto bad;
                    678:        }
                    679:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    680:                if (m->m_len == m->m_pkthdr.len) {
                    681:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    682:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    683:                } else
                    684:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    685:        }
                    686:
                    687:        /*
                    688:         * Forward if desirable.
                    689:         */
                    690:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    691:                /*
                    692:                 * If we are acting as a multicast router, all
                    693:                 * incoming multicast packets are passed to the
                    694:                 * kernel-level multicast forwarding function.
                    695:                 * The packet is returned (relatively) intact; if
                    696:                 * ip6_mforward() returns a non-zero value, the packet
                    697:                 * must be discarded, else it may be accepted below.
                    698:                 */
                    699:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116   ! thorpej   700:                        IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2       itojun    701:                        m_freem(m);
                    702:                        return;
                    703:                }
                    704:                if (!ours) {
                    705:                        m_freem(m);
                    706:                        return;
                    707:                }
1.22      itojun    708:        } else if (!ours) {
1.64      itojun    709:                ip6_forward(m, srcrt);
1.2       itojun    710:                return;
1.56      itojun    711:        }
1.25      itojun    712:
                    713:        ip6 = mtod(m, struct ip6_hdr *);
                    714:
                    715:        /*
                    716:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    717:         * tcp/udp stack and bypass security checks (act as if it was from
                    718:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    719:         *
                    720:         * For SIIT end node behavior, you may want to disable the check.
                    721:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    722:         * source.
                    723:         */
                    724:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    725:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116   ! thorpej   726:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.25      itojun    727:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    728:                goto bad;
                    729:        }
1.2       itojun    730:
                    731:        /*
                    732:         * Tell launch routine the next header
                    733:         */
1.12      itojun    734: #ifdef IFA_STATS
1.28      itojun    735:        if (deliverifp != NULL) {
1.9       itojun    736:                struct in6_ifaddr *ia6;
                    737:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    738:                if (ia6)
                    739:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    740:        }
                    741: #endif
1.116   ! thorpej   742:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    743:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    744:        nest = 0;
1.40      itojun    745:
1.104     yamt      746:        rh_present = 0;
1.2       itojun    747:        while (nxt != IPPROTO_DONE) {
                    748:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116   ! thorpej   749:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104     yamt      750:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    751:                        goto bad;
                    752:                }
1.8       itojun    753:
                    754:                /*
                    755:                 * protection against faulty packet - there should be
                    756:                 * more sanity checks in header chain processing.
                    757:                 */
                    758:                if (m->m_pkthdr.len < off) {
1.116   ! thorpej   759:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    760:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    761:                        goto bad;
                    762:                }
                    763:
1.104     yamt      764:                if (nxt == IPPROTO_ROUTING) {
                    765:                        if (rh_present++) {
                    766:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
                    767:                                    ifs6_in_hdrerr);
1.116   ! thorpej   768:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      769:                                goto bad;
                    770:                        }
                    771:                }
                    772:
1.37      itojun    773: #ifdef IPSEC
                    774:                /*
                    775:                 * enforce IPsec policy checking if we are seeing last header.
                    776:                 * note that we do not visit this with protocols with pcb layer
                    777:                 * code - like udp/tcp/raw ip.
                    778:                 */
                    779:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    780:                    ipsec6_in_reject(m, NULL)) {
                    781:                        ipsec6stat.in_polvio++;
                    782:                        goto bad;
                    783:                }
                    784: #endif
1.94      degroote  785: #ifdef FAST_IPSEC
                    786:        /*
                    787:         * enforce IPsec policy checking if we are seeing last header.
                    788:         * note that we do not visit this with protocols with pcb layer
                    789:         * code - like udp/tcp/raw ip.
                    790:         */
                    791:        if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
                    792:                /*
                    793:                 * Check if the packet has already had IPsec processing
                    794:                 * done.  If so, then just pass it along.  This tag gets
                    795:                 * set during AH, ESP, etc. input handling, before the
                    796:                 * packet is returned to the ip input queue for delivery.
                    797:                 */
                    798:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    799:                s = splsoftnet();
                    800:                if (mtag != NULL) {
                    801:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    802:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    803:                } else {
                    804:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    805:                                                                        IP_FORWARDING, &error);
                    806:                }
                    807:                if (sp != NULL) {
                    808:                        /*
                    809:                         * Check security policy against packet attributes.
                    810:                         */
                    811:                        error = ipsec_in_reject(sp, m);
                    812:                        KEY_FREESP(&sp);
                    813:                } else {
                    814:                        /* XXX error stat??? */
                    815:                        error = EINVAL;
                    816:                        DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
                    817:                }
                    818:                splx(s);
                    819:                if (error)
                    820:                        goto bad;
                    821:        }
                    822: #endif /* FAST_IPSEC */
                    823:
1.56      itojun    824:
1.2       itojun    825:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    826:        }
                    827:        return;
                    828:  bad:
                    829:        m_freem(m);
                    830: }
                    831:
                    832: /*
1.81      rpaulo    833:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    834:  */
                    835: static struct m_tag *
1.112     dyoung    836: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    837: {
                    838:        struct m_tag *mtag;
                    839:
                    840:        mtag = ip6_addaux(m);
1.112     dyoung    841:        if (mtag != NULL) {
                    842:                struct ip6aux *ip6a;
                    843:
                    844:                ip6a = (struct ip6aux *)(mtag + 1);
                    845:                in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
                    846:                ip6a->ip6a_src = ia->ia_addr.sin6_addr;
                    847:                ip6a->ip6a_flags = ia->ia6_flags;
                    848:        }
1.81      rpaulo    849:        return mtag;    /* NULL if failed to set */
                    850: }
                    851:
1.112     dyoung    852: const struct ip6aux *
1.107     christos  853: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    854: {
                    855:        struct m_tag *mtag;
                    856:
                    857:        mtag = ip6_findaux(m);
1.112     dyoung    858:        if (mtag != NULL)
                    859:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    860:        else
                    861:                return NULL;
                    862: }
                    863:
                    864: /*
1.2       itojun    865:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    866:  * included, the real payload length will be stored in plenp.
1.107     christos  867:  *
                    868:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    869:  */
                    870: static int
1.107     christos  871: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
                    872:        struct mbuf **mp, int *offp)
1.2       itojun    873: {
1.35      itojun    874:        struct mbuf *m = *mp;
1.2       itojun    875:        int off = *offp, hbhlen;
                    876:        struct ip6_hbh *hbh;
                    877:
                    878:        /* validation of the length of the header */
1.9       itojun    879:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    880:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    881:        if (hbh == NULL) {
1.116   ! thorpej   882:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    883:                return -1;
                    884:        }
                    885:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    886:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    887:                hbhlen);
                    888:        if (hbh == NULL) {
1.116   ! thorpej   889:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    890:                return -1;
                    891:        }
1.57      thorpej   892:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    893:        off += hbhlen;
                    894:        hbhlen -= sizeof(struct ip6_hbh);
                    895:
                    896:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    897:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    898:                return (-1);
1.2       itojun    899:
                    900:        *offp = off;
                    901:        *mp = m;
1.58      itojun    902:        return (0);
1.2       itojun    903: }
                    904:
                    905: /*
                    906:  * Search header for all Hop-by-hop options and process each option.
                    907:  * This function is separate from ip6_hopopts_input() in order to
                    908:  * handle a case where the sending node itself process its hop-by-hop
                    909:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    910:  *
                    911:  * The function assumes that hbh header is located right after the IPv6 header
                    912:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    913:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    914:  */
                    915: int
1.107     christos  916: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
                    917:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    918: {
                    919:        struct ip6_hdr *ip6;
                    920:        int optlen = 0;
                    921:        u_int8_t *opt = opthead;
                    922:        u_int16_t rtalert_val;
1.22      itojun    923:        u_int32_t jumboplen;
1.55      itojun    924:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    925:
                    926:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    927:                switch (*opt) {
                    928:                case IP6OPT_PAD1:
                    929:                        optlen = 1;
                    930:                        break;
                    931:                case IP6OPT_PADN:
                    932:                        if (hbhlen < IP6OPT_MINLEN) {
1.116   ! thorpej   933:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    934:                                goto bad;
                    935:                        }
                    936:                        optlen = *(opt + 1) + 2;
                    937:                        break;
                    938:                case IP6OPT_RTALERT:
                    939:                        /* XXX may need check for alignment */
                    940:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116   ! thorpej   941:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    942:                                goto bad;
                    943:                        }
                    944:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    945:                                /* XXX stat */
                    946:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    947:                                    ICMP6_PARAMPROB_HEADER,
                    948:                                    erroff + opt + 1 - opthead);
                    949:                                return (-1);
1.35      itojun    950:                        }
                    951:                        optlen = IP6OPT_RTALERT_LEN;
1.97      christos  952:                        bcopy((void *)(opt + 2), (void *)&rtalert_val, 2);
1.35      itojun    953:                        *rtalertp = ntohs(rtalert_val);
                    954:                        break;
                    955:                case IP6OPT_JUMBO:
1.22      itojun    956:                        /* XXX may need check for alignment */
                    957:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116   ! thorpej   958:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    959:                                goto bad;
                    960:                        }
1.35      itojun    961:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    962:                                /* XXX stat */
                    963:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    964:                                    ICMP6_PARAMPROB_HEADER,
                    965:                                    erroff + opt + 1 - opthead);
                    966:                                return (-1);
1.35      itojun    967:                        }
1.22      itojun    968:                        optlen = IP6OPT_JUMBO_LEN;
                    969:
                    970:                        /*
                    971:                         * IPv6 packets that have non 0 payload length
1.35      itojun    972:                         * must not contain a jumbo payload option.
1.22      itojun    973:                         */
                    974:                        ip6 = mtod(m, struct ip6_hdr *);
                    975:                        if (ip6->ip6_plen) {
1.116   ! thorpej   976:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    977:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    978:                                    ICMP6_PARAMPROB_HEADER,
                    979:                                    erroff + opt - opthead);
                    980:                                return (-1);
1.22      itojun    981:                        }
1.2       itojun    982:
1.22      itojun    983:                        /*
                    984:                         * We may see jumbolen in unaligned location, so
                    985:                         * we'd need to perform bcopy().
                    986:                         */
                    987:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    988:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    989:
                    990: #if 1
                    991:                        /*
                    992:                         * if there are multiple jumbo payload options,
                    993:                         * *plenp will be non-zero and the packet will be
                    994:                         * rejected.
                    995:                         * the behavior may need some debate in ipngwg -
                    996:                         * multiple options does not make sense, however,
                    997:                         * there's no explicit mention in specification.
                    998:                         */
                    999:                        if (*plenp != 0) {
1.116   ! thorpej  1000:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun   1001:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1002:                                    ICMP6_PARAMPROB_HEADER,
                   1003:                                    erroff + opt + 2 - opthead);
                   1004:                                return (-1);
1.22      itojun   1005:                        }
1.8       itojun   1006: #endif
1.2       itojun   1007:
1.22      itojun   1008:                        /*
                   1009:                         * jumbo payload length must be larger than 65535.
                   1010:                         */
                   1011:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116   ! thorpej  1012:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun   1013:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1014:                                    ICMP6_PARAMPROB_HEADER,
                   1015:                                    erroff + opt + 2 - opthead);
                   1016:                                return (-1);
1.22      itojun   1017:                        }
                   1018:                        *plenp = jumboplen;
                   1019:
                   1020:                        break;
1.35      itojun   1021:                default:                /* unknown option */
                   1022:                        if (hbhlen < IP6OPT_MINLEN) {
1.116   ! thorpej  1023:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun   1024:                                goto bad;
                   1025:                        }
1.55      itojun   1026:                        optlen = ip6_unknown_opt(opt, m,
                   1027:                            erroff + opt - opthead);
                   1028:                        if (optlen == -1)
                   1029:                                return (-1);
1.35      itojun   1030:                        optlen += 2;
                   1031:                        break;
1.2       itojun   1032:                }
                   1033:        }
                   1034:
1.55      itojun   1035:        return (0);
1.2       itojun   1036:
                   1037:   bad:
                   1038:        m_freem(m);
1.55      itojun   1039:        return (-1);
1.2       itojun   1040: }
                   1041:
                   1042: /*
                   1043:  * Unknown option processing.
                   1044:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1045:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1046:  * is not continuous in order to return an ICMPv6 error.
                   1047:  */
                   1048: int
1.107     christos 1049: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun   1050: {
                   1051:        struct ip6_hdr *ip6;
                   1052:
1.35      itojun   1053:        switch (IP6OPT_TYPE(*optp)) {
                   1054:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1055:                return ((int)*(optp + 1));
1.35      itojun   1056:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1057:                m_freem(m);
1.58      itojun   1058:                return (-1);
1.35      itojun   1059:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116   ! thorpej  1060:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1061:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1062:                return (-1);
1.35      itojun   1063:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116   ! thorpej  1064:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1065:                ip6 = mtod(m, struct ip6_hdr *);
                   1066:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1067:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1068:                        m_freem(m);
                   1069:                else
                   1070:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1071:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1072:                return (-1);
1.2       itojun   1073:        }
                   1074:
                   1075:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1076:        return (-1);
1.2       itojun   1077: }
                   1078:
                   1079: /*
1.9       itojun   1080:  * Create the "control" list for this pcb.
                   1081:  *
                   1082:  * The routine will be called from upper layer handlers like tcp6_input().
                   1083:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1084:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1085:  * very first mbuf on the mbuf chain.
                   1086:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1087:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1088:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1089:  */
                   1090: void
1.107     christos 1091: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
                   1092:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1093: {
1.85      rpaulo   1094: #ifdef RFC2292
                   1095: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1096: #else
                   1097: #define IS2292(x, y)   (y)
                   1098: #endif
                   1099:
1.9       itojun   1100: #ifdef SO_TIMESTAMP
1.2       itojun   1101:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1102:                struct timeval tv;
                   1103:
                   1104:                microtime(&tv);
1.97      christos 1105:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1106:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1107:                if (*mp)
                   1108:                        mp = &(*mp)->m_next;
                   1109:        }
1.9       itojun   1110: #endif
1.87      rpaulo   1111:
                   1112:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1113:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1114:                return;
                   1115:
1.2       itojun   1116:        /* RFC 2292 sec. 5 */
1.35      itojun   1117:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1118:                struct in6_pktinfo pi6;
1.85      rpaulo   1119:
1.2       itojun   1120:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1.81      rpaulo   1121:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1122:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1123:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1124:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1125:                    sizeof(struct in6_pktinfo),
                   1126:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1127:                if (*mp)
                   1128:                        mp = &(*mp)->m_next;
                   1129:        }
1.85      rpaulo   1130:
1.2       itojun   1131:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1132:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1133:
1.97      christos 1134:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1135:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1136:                if (*mp)
                   1137:                        mp = &(*mp)->m_next;
                   1138:        }
                   1139:
                   1140:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1141:                u_int32_t flowinfo;
                   1142:                int tclass;
                   1143:
                   1144:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1145:                flowinfo >>= 20;
                   1146:
                   1147:                tclass = flowinfo & 0xff;
1.97      christos 1148:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1149:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1150:
1.2       itojun   1151:                if (*mp)
                   1152:                        mp = &(*mp)->m_next;
                   1153:        }
                   1154:
                   1155:        /*
1.75      itojun   1156:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1157:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1158:         * strict, since there might be some hop-by-hop options which can be
                   1159:         * returned to normal user.
1.85      rpaulo   1160:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1161:         */
1.75      itojun   1162:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1163:                /*
                   1164:                 * Check if a hop-by-hop options header is contatined in the
                   1165:                 * received packet, and if so, store the options as ancillary
                   1166:                 * data. Note that a hop-by-hop options header must be
                   1167:                 * just after the IPv6 header, which fact is assured through
                   1168:                 * the IPv6 input processing.
                   1169:                 */
1.78      christos 1170:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1171:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1172:                        struct ip6_hbh *hbh;
                   1173:                        int hbhlen;
1.62      itojun   1174:                        struct mbuf *ext;
1.9       itojun   1175:
1.62      itojun   1176:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1177:                            xip6->ip6_nxt);
1.62      itojun   1178:                        if (ext == NULL) {
1.116   ! thorpej  1179:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1180:                                return;
                   1181:                        }
1.62      itojun   1182:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1183:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1184:                        if (hbhlen != ext->m_len) {
                   1185:                                m_freem(ext);
1.116   ! thorpej  1186:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1187:                                return;
                   1188:                        }
1.2       itojun   1189:
                   1190:                        /*
                   1191:                         * XXX: We copy whole the header even if a jumbo
                   1192:                         * payload option is included, which option is to
                   1193:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1194:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1195:                         */
1.97      christos 1196:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1197:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1198:                            IPPROTO_IPV6);
1.2       itojun   1199:                        if (*mp)
                   1200:                                mp = &(*mp)->m_next;
1.62      itojun   1201:                        m_freem(ext);
1.2       itojun   1202:                }
                   1203:        }
                   1204:
                   1205:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1206:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1207:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1208:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1209:
                   1210:                /*
                   1211:                 * Search for destination options headers or routing
                   1212:                 * header(s) through the header chain, and stores each
                   1213:                 * header as ancillary data.
                   1214:                 * Note that the order of the headers remains in
                   1215:                 * the chain of ancillary data.
                   1216:                 */
1.86      rpaulo   1217:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1218:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1219:                        int elen;
1.62      itojun   1220:                        struct mbuf *ext = NULL;
1.9       itojun   1221:
1.62      itojun   1222:                        /*
                   1223:                         * if it is not an extension header, don't try to
                   1224:                         * pull it from the chain.
                   1225:                         */
                   1226:                        switch (nxt) {
                   1227:                        case IPPROTO_DSTOPTS:
                   1228:                        case IPPROTO_ROUTING:
                   1229:                        case IPPROTO_HOPOPTS:
                   1230:                        case IPPROTO_AH: /* is it possible? */
                   1231:                                break;
                   1232:                        default:
                   1233:                                goto loopend;
                   1234:                        }
                   1235:
                   1236:                        ext = ip6_pullexthdr(m, off, nxt);
                   1237:                        if (ext == NULL) {
1.116   ! thorpej  1238:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1239:                                return;
                   1240:                        }
1.62      itojun   1241:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1242:                        if (nxt == IPPROTO_AH)
                   1243:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1244:                        else
                   1245:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1246:                        if (elen != ext->m_len) {
                   1247:                                m_freem(ext);
1.116   ! thorpej  1248:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1249:                                return;
                   1250:                        }
1.57      thorpej  1251:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1252:
1.35      itojun   1253:                        switch (nxt) {
1.62      itojun   1254:                        case IPPROTO_DSTOPTS:
1.35      itojun   1255:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1256:                                        break;
                   1257:
1.97      christos 1258:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1259:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1260:                                    IPPROTO_IPV6);
1.35      itojun   1261:                                if (*mp)
                   1262:                                        mp = &(*mp)->m_next;
                   1263:                                break;
                   1264:
                   1265:                        case IPPROTO_ROUTING:
                   1266:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1267:                                        break;
                   1268:
1.97      christos 1269:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1270:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1271:                                    IPPROTO_IPV6);
1.35      itojun   1272:                                if (*mp)
                   1273:                                        mp = &(*mp)->m_next;
                   1274:                                break;
                   1275:
1.62      itojun   1276:                        case IPPROTO_HOPOPTS:
                   1277:                        case IPPROTO_AH: /* is it possible? */
                   1278:                                break;
                   1279:
1.35      itojun   1280:                        default:
                   1281:                                /*
1.62      itojun   1282:                                 * other cases have been filtered in the above.
                   1283:                                 * none will visit this case.  here we supply
                   1284:                                 * the code just in case (nxt overwritten or
                   1285:                                 * other cases).
1.35      itojun   1286:                                 */
1.62      itojun   1287:                                m_freem(ext);
1.35      itojun   1288:                                goto loopend;
                   1289:
1.2       itojun   1290:                        }
                   1291:
                   1292:                        /* proceed with the next header. */
1.9       itojun   1293:                        off += elen;
1.2       itojun   1294:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1295:                        ip6e = NULL;
                   1296:                        m_freem(ext);
                   1297:                        ext = NULL;
1.2       itojun   1298:                }
                   1299:          loopend:
1.62      itojun   1300:                ;
1.2       itojun   1301:        }
1.62      itojun   1302: }
1.85      rpaulo   1303: #undef IS2292
                   1304:
                   1305:
                   1306: void
1.95      dyoung   1307: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1308:     uint32_t *mtu)
1.85      rpaulo   1309: {
                   1310:        struct socket *so;
                   1311:        struct mbuf *m_mtu;
                   1312:        struct ip6_mtuinfo mtuctl;
                   1313:
                   1314:        so = in6p->in6p_socket;
                   1315:
                   1316:        if (mtu == NULL)
                   1317:                return;
                   1318:
                   1319: #ifdef DIAGNOSTIC
                   1320:        if (so == NULL)         /* I believe this is impossible */
                   1321:                panic("ip6_notify_pmtu: socket is NULL");
                   1322: #endif
                   1323:
                   1324:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1325:        mtuctl.ip6m_mtu = *mtu;
                   1326:        mtuctl.ip6m_addr = *dst;
                   1327:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1328:                return;
                   1329:
1.97      christos 1330:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1331:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1332:                return;
                   1333:
1.95      dyoung   1334:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1335:            == 0) {
                   1336:                m_freem(m_mtu);
                   1337:                /* XXX: should count statistics */
                   1338:        } else
                   1339:                sorwakeup(so);
                   1340:
                   1341:        return;
                   1342: }
1.62      itojun   1343:
                   1344: /*
                   1345:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1346:  * contains the result, or NULL on error.
                   1347:  */
                   1348: static struct mbuf *
1.107     christos 1349: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1350: {
                   1351:        struct ip6_ext ip6e;
                   1352:        size_t elen;
                   1353:        struct mbuf *n;
                   1354:
                   1355: #ifdef DIAGNOSTIC
                   1356:        switch (nxt) {
                   1357:        case IPPROTO_DSTOPTS:
                   1358:        case IPPROTO_ROUTING:
                   1359:        case IPPROTO_HOPOPTS:
                   1360:        case IPPROTO_AH: /* is it possible? */
                   1361:                break;
                   1362:        default:
                   1363:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1364:        }
1.62      itojun   1365: #endif
1.2       itojun   1366:
1.97      christos 1367:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1368:        if (nxt == IPPROTO_AH)
                   1369:                elen = (ip6e.ip6e_len + 2) << 2;
                   1370:        else
                   1371:                elen = (ip6e.ip6e_len + 1) << 3;
                   1372:
                   1373:        MGET(n, M_DONTWAIT, MT_DATA);
                   1374:        if (n && elen >= MLEN) {
                   1375:                MCLGET(n, M_DONTWAIT);
                   1376:                if ((n->m_flags & M_EXT) == 0) {
                   1377:                        m_free(n);
                   1378:                        n = NULL;
                   1379:                }
                   1380:        }
                   1381:        if (!n)
                   1382:                return NULL;
                   1383:
                   1384:        n->m_len = 0;
                   1385:        if (elen >= M_TRAILINGSPACE(n)) {
                   1386:                m_free(n);
                   1387:                return NULL;
                   1388:        }
                   1389:
1.97      christos 1390:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1391:        n->m_len = elen;
                   1392:        return n;
1.2       itojun   1393: }
                   1394:
                   1395: /*
                   1396:  * Get pointer to the previous header followed by the header
                   1397:  * currently processed.
                   1398:  * XXX: This function supposes that
                   1399:  *     M includes all headers,
                   1400:  *     the next header field and the header length field of each header
                   1401:  *     are valid, and
                   1402:  *     the sum of each header length equals to OFF.
                   1403:  * Because of these assumptions, this function must be called very
                   1404:  * carefully. Moreover, it will not be used in the near future when
                   1405:  * we develop `neater' mechanism to process extension headers.
                   1406:  */
1.58      itojun   1407: u_int8_t *
1.107     christos 1408: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1409: {
                   1410:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1411:
                   1412:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1413:                return (&ip6->ip6_nxt);
1.2       itojun   1414:        else {
                   1415:                int len, nxt;
                   1416:                struct ip6_ext *ip6e = NULL;
                   1417:
                   1418:                nxt = ip6->ip6_nxt;
                   1419:                len = sizeof(struct ip6_hdr);
                   1420:                while (len < off) {
1.97      christos 1421:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1422:
1.35      itojun   1423:                        switch (nxt) {
1.2       itojun   1424:                        case IPPROTO_FRAGMENT:
                   1425:                                len += sizeof(struct ip6_frag);
                   1426:                                break;
                   1427:                        case IPPROTO_AH:
                   1428:                                len += (ip6e->ip6e_len + 2) << 2;
                   1429:                                break;
                   1430:                        default:
                   1431:                                len += (ip6e->ip6e_len + 1) << 3;
                   1432:                                break;
                   1433:                        }
                   1434:                        nxt = ip6e->ip6e_nxt;
                   1435:                }
                   1436:                if (ip6e)
1.58      itojun   1437:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1438:                else
                   1439:                        return NULL;
1.18      itojun   1440:        }
                   1441: }
                   1442:
                   1443: /*
                   1444:  * get next header offset.  m will be retained.
                   1445:  */
                   1446: int
1.107     christos 1447: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1448: {
                   1449:        struct ip6_hdr ip6;
                   1450:        struct ip6_ext ip6e;
                   1451:        struct ip6_frag fh;
                   1452:
                   1453:        /* just in case */
                   1454:        if (m == NULL)
                   1455:                panic("ip6_nexthdr: m == NULL");
                   1456:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1457:                return -1;
                   1458:
                   1459:        switch (proto) {
                   1460:        case IPPROTO_IPV6:
1.83      rpaulo   1461:                /* do not chase beyond intermediate IPv6 headers */
                   1462:                if (off != 0)
                   1463:                        return -1;
1.18      itojun   1464:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1465:                        return -1;
1.97      christos 1466:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1467:                if (nxtp)
                   1468:                        *nxtp = ip6.ip6_nxt;
                   1469:                off += sizeof(ip6);
                   1470:                return off;
                   1471:
                   1472:        case IPPROTO_FRAGMENT:
                   1473:                /*
                   1474:                 * terminate parsing if it is not the first fragment,
                   1475:                 * it does not make sense to parse through it.
                   1476:                 */
                   1477:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1478:                        return -1;
1.97      christos 1479:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1480:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1481:                        return -1;
                   1482:                if (nxtp)
                   1483:                        *nxtp = fh.ip6f_nxt;
                   1484:                off += sizeof(struct ip6_frag);
                   1485:                return off;
                   1486:
                   1487:        case IPPROTO_AH:
                   1488:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1489:                        return -1;
1.97      christos 1490:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1491:                if (nxtp)
                   1492:                        *nxtp = ip6e.ip6e_nxt;
                   1493:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1494:                if (m->m_pkthdr.len < off)
                   1495:                        return -1;
1.18      itojun   1496:                return off;
                   1497:
                   1498:        case IPPROTO_HOPOPTS:
                   1499:        case IPPROTO_ROUTING:
                   1500:        case IPPROTO_DSTOPTS:
                   1501:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1502:                        return -1;
1.97      christos 1503:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1504:                if (nxtp)
                   1505:                        *nxtp = ip6e.ip6e_nxt;
                   1506:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1507:                if (m->m_pkthdr.len < off)
                   1508:                        return -1;
1.18      itojun   1509:                return off;
                   1510:
                   1511:        case IPPROTO_NONE:
                   1512:        case IPPROTO_ESP:
                   1513:        case IPPROTO_IPCOMP:
                   1514:                /* give up */
                   1515:                return -1;
                   1516:
                   1517:        default:
                   1518:                return -1;
                   1519:        }
                   1520: }
                   1521:
                   1522: /*
                   1523:  * get offset for the last header in the chain.  m will be kept untainted.
                   1524:  */
                   1525: int
1.107     christos 1526: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1527: {
                   1528:        int newoff;
                   1529:        int nxt;
                   1530:
                   1531:        if (!nxtp) {
                   1532:                nxt = -1;
                   1533:                nxtp = &nxt;
                   1534:        }
1.86      rpaulo   1535:        for (;;) {
1.18      itojun   1536:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1537:                if (newoff < 0)
                   1538:                        return off;
                   1539:                else if (newoff < off)
                   1540:                        return -1;      /* invalid */
                   1541:                else if (newoff == off)
                   1542:                        return newoff;
                   1543:
                   1544:                off = newoff;
                   1545:                proto = *nxtp;
1.2       itojun   1546:        }
                   1547: }
                   1548:
1.81      rpaulo   1549: struct m_tag *
1.107     christos 1550: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1551: {
                   1552:        struct m_tag *mtag;
                   1553:
                   1554:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1555:        if (!mtag) {
                   1556:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1557:                    M_NOWAIT);
                   1558:                if (mtag) {
                   1559:                        m_tag_prepend(m, mtag);
                   1560:                        bzero(mtag + 1, sizeof(struct ip6aux));
                   1561:                }
                   1562:        }
                   1563:        return mtag;
                   1564: }
                   1565:
                   1566: struct m_tag *
1.107     christos 1567: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1568: {
                   1569:        struct m_tag *mtag;
                   1570:
                   1571:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1572:        return mtag;
                   1573: }
                   1574:
                   1575: void
1.107     christos 1576: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1577: {
                   1578:        struct m_tag *mtag;
                   1579:
                   1580:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1581:        if (mtag)
                   1582:                m_tag_delete(m, mtag);
                   1583: }
                   1584:
1.98      liamjfoy 1585: #ifdef GATEWAY
                   1586: /*
                   1587:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1588:  * we could reduce this value, call ip6flow_reap();
                   1589:  */
                   1590: static int
1.101     liamjfoy 1591: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98      liamjfoy 1592: {
                   1593:         int s;
                   1594:
                   1595:         s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.100     liamjfoy 1596:         if (s || newp == NULL)
1.98      liamjfoy 1597:                 return (s);
                   1598:
                   1599:         s = splsoftnet();
                   1600:         ip6flow_reap(0);
                   1601:         splx(s);
                   1602:
                   1603:         return (0);
                   1604: }
1.99      liamjfoy 1605:
                   1606: static int
                   1607: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1608: {
                   1609:        int error, tmp;
                   1610:        struct sysctlnode node;
                   1611:
                   1612:        node = *rnode;
                   1613:        tmp = ip6_hashsize;
                   1614:        node.sysctl_data = &tmp;
                   1615:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1616:        if (error || newp == NULL)
                   1617:                return (error);
                   1618:
                   1619:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1620:                /*
                   1621:                 * Can only fail due to malloc()
                   1622:                 */
                   1623:                if (ip6flow_invalidate_all(tmp))
                   1624:                        return ENOMEM;
                   1625:        } else {
                   1626:                /*
                   1627:                 * EINVAL if not a power of 2
                   1628:                 */
                   1629:                return EINVAL;
                   1630:        }
                   1631:
                   1632:        return (0);
                   1633: }
1.98      liamjfoy 1634: #endif /* GATEWAY */
                   1635:
1.2       itojun   1636: /*
                   1637:  * System control for IP6
                   1638:  */
                   1639:
                   1640: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1641:        0,              0,              0,              0,
                   1642:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1643:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1644:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1645:        0,              0,              0,              0,
                   1646:        ENOPROTOOPT
                   1647: };
                   1648:
1.116   ! thorpej  1649: static void
        !          1650: ip6stat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci)
        !          1651: {
        !          1652:        uint64_t *ip6sc = v1;
        !          1653:        uint64_t *ip6s = v2;
        !          1654:        u_int i;
        !          1655:
        !          1656:        for (i = 0; i < IP6_NSTATS; i++)
        !          1657:                ip6s[i] += ip6sc[i];
        !          1658: }
        !          1659:
        !          1660: static void
        !          1661: ip6stat_convert_to_user(uint64_t *ip6s)
        !          1662: {
        !          1663:
        !          1664:        memset(ip6s, 0, sizeof(uint64_t) * IP6_NSTATS);
        !          1665:        percpu_foreach(ip6stat_percpu, ip6stat_convert_to_user_cb, ip6s);
        !          1666: }
        !          1667:
        !          1668: static int
        !          1669: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
        !          1670: {
        !          1671:        struct sysctlnode node;
        !          1672:        uint64_t ip6s[IP6_NSTATS];
        !          1673:
        !          1674:        ip6stat_convert_to_user(ip6s);
        !          1675:        node = *rnode;
        !          1676:        node.sysctl_data = ip6s;
        !          1677:        node.sysctl_size = sizeof(ip6s);
        !          1678:        return (sysctl_lookup(SYSCTLFN_CALL(&node)));
        !          1679: }
        !          1680:
1.70      atatat   1681: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2       itojun   1682: {
1.85      rpaulo   1683: #ifdef RFC2292
                   1684: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1685: #else
                   1686: #define IS2292(x, y)   (y)
                   1687: #endif
1.26      itojun   1688:
1.73      atatat   1689:        sysctl_createv(clog, 0, NULL, NULL,
                   1690:                       CTLFLAG_PERMANENT,
1.70      atatat   1691:                       CTLTYPE_NODE, "net", NULL,
                   1692:                       NULL, 0, NULL, 0,
                   1693:                       CTL_NET, CTL_EOL);
1.73      atatat   1694:        sysctl_createv(clog, 0, NULL, NULL,
                   1695:                       CTLFLAG_PERMANENT,
1.74      atatat   1696:                       CTLTYPE_NODE, "inet6",
                   1697:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1698:                       NULL, 0, NULL, 0,
                   1699:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1700:        sysctl_createv(clog, 0, NULL, NULL,
                   1701:                       CTLFLAG_PERMANENT,
1.74      atatat   1702:                       CTLTYPE_NODE, "ip6",
                   1703:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1704:                       NULL, 0, NULL, 0,
                   1705:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1706:
1.73      atatat   1707:        sysctl_createv(clog, 0, NULL, NULL,
                   1708:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1709:                       CTLTYPE_INT, "forwarding",
                   1710:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1711:                       NULL, 0, &ip6_forwarding, 0,
                   1712:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1713:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1714:        sysctl_createv(clog, 0, NULL, NULL,
                   1715:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1716:                       CTLTYPE_INT, "redirect",
                   1717:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1718:                       NULL, 0, &ip6_sendredirects, 0,
                   1719:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1720:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1721:        sysctl_createv(clog, 0, NULL, NULL,
                   1722:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1723:                       CTLTYPE_INT, "hlim",
                   1724:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1725:                       NULL, 0, &ip6_defhlim, 0,
                   1726:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1727:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1728: #ifdef notyet
1.73      atatat   1729:        sysctl_createv(clog, 0, NULL, NULL,
                   1730:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1731:                       CTLTYPE_INT, "mtu", NULL,
                   1732:                       NULL, 0, &, 0,
                   1733:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1734:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1735: #endif
                   1736: #ifdef __no_idea__
1.73      atatat   1737:        sysctl_createv(clog, 0, NULL, NULL,
                   1738:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1739:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1740:                       NULL, 0, &?, 0,
                   1741:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1742:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1743:        sysctl_createv(clog, 0, NULL, NULL,
                   1744:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1745:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1746:                       NULL, 0, &?, sizeof(?),
                   1747:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1748:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1749:        sysctl_createv(clog, 0, NULL, NULL,
                   1750:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1751:                       CTLTYPE_?, "mrtproto", NULL,
                   1752:                       NULL, 0, &?, sizeof(?),
                   1753:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1754:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1755: #endif
1.73      atatat   1756:        sysctl_createv(clog, 0, NULL, NULL,
                   1757:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1758:                       CTLTYPE_INT, "maxfragpackets",
                   1759:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1760:                                    "for reassembly"),
1.70      atatat   1761:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1762:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1763:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1764: #ifdef __no_idea__
1.73      atatat   1765:        sysctl_createv(clog, 0, NULL, NULL,
                   1766:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1767:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1768:                       NULL, 0, &?, 0,
                   1769:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1770:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1771:        sysctl_createv(clog, 0, NULL, NULL,
                   1772:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1773:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1774:                       NULL, 0, &?, 0,
                   1775:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1776:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1777: #endif
1.73      atatat   1778:        sysctl_createv(clog, 0, NULL, NULL,
                   1779:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1780:                       CTLTYPE_INT, "accept_rtadv",
                   1781:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1782:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1783:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1784:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1785:        sysctl_createv(clog, 0, NULL, NULL,
                   1786:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1787:                       CTLTYPE_INT, "keepfaith",
                   1788:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1789:                       NULL, 0, &ip6_keepfaith, 0,
                   1790:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1791:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1792:        sysctl_createv(clog, 0, NULL, NULL,
                   1793:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1794:                       CTLTYPE_INT, "log_interval",
                   1795:                       SYSCTL_DESCR("Minumum interval between logging "
                   1796:                                    "unroutable packets"),
1.70      atatat   1797:                       NULL, 0, &ip6_log_interval, 0,
                   1798:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1799:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1800:        sysctl_createv(clog, 0, NULL, NULL,
                   1801:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1802:                       CTLTYPE_INT, "hdrnestlimit",
                   1803:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1804:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1805:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1806:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1807:        sysctl_createv(clog, 0, NULL, NULL,
                   1808:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1809:                       CTLTYPE_INT, "dad_count",
                   1810:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1811:                                    "probes to send"),
1.70      atatat   1812:                       NULL, 0, &ip6_dad_count, 0,
                   1813:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1814:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1815:        sysctl_createv(clog, 0, NULL, NULL,
                   1816:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1817:                       CTLTYPE_INT, "auto_flowlabel",
                   1818:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1819:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1820:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1821:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1822:        sysctl_createv(clog, 0, NULL, NULL,
                   1823:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1824:                       CTLTYPE_INT, "defmcasthlim",
                   1825:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1826:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1827:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1828:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1829: #if NGIF > 0
1.73      atatat   1830:        sysctl_createv(clog, 0, NULL, NULL,
                   1831:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1832:                       CTLTYPE_INT, "gifhlim",
                   1833:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1834:                       NULL, 0, &ip6_gif_hlim, 0,
                   1835:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1836:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1837: #endif /* NGIF */
1.73      atatat   1838:        sysctl_createv(clog, 0, NULL, NULL,
                   1839:                       CTLFLAG_PERMANENT,
1.74      atatat   1840:                       CTLTYPE_STRING, "kame_version",
                   1841:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1842:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1843:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1844:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1845:        sysctl_createv(clog, 0, NULL, NULL,
                   1846:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1847:                       CTLTYPE_INT, "use_deprecated",
                   1848:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1849:                                    "source addresses"),
1.70      atatat   1850:                       NULL, 0, &ip6_use_deprecated, 0,
                   1851:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1852:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1853:        sysctl_createv(clog, 0, NULL, NULL,
                   1854:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1855:                       CTLTYPE_INT, "rr_prune", NULL,
                   1856:                       NULL, 0, &ip6_rr_prune, 0,
                   1857:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1858:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1859:        sysctl_createv(clog, 0, NULL, NULL,
                   1860:                       CTLFLAG_PERMANENT
1.70      atatat   1861: #ifndef INET6_BINDV6ONLY
1.73      atatat   1862:                       |CTLFLAG_READWRITE,
1.70      atatat   1863: #endif
1.74      atatat   1864:                       CTLTYPE_INT, "v6only",
                   1865:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1866:                                    "to PF_INET sockets"),
1.70      atatat   1867:                       NULL, 0, &ip6_v6only, 0,
                   1868:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1869:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1870:        sysctl_createv(clog, 0, NULL, NULL,
                   1871:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1872:                       CTLTYPE_INT, "anonportmin",
                   1873:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1874:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1875:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1876:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1877:        sysctl_createv(clog, 0, NULL, NULL,
                   1878:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1879:                       CTLTYPE_INT, "anonportmax",
                   1880:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1881:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1882:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1883:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1884: #ifndef IPNOPRIVPORTS
1.73      atatat   1885:        sysctl_createv(clog, 0, NULL, NULL,
                   1886:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1887:                       CTLTYPE_INT, "lowportmin",
                   1888:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1889:                                    "to assign"),
1.70      atatat   1890:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1891:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1892:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1893:        sysctl_createv(clog, 0, NULL, NULL,
                   1894:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1895:                       CTLTYPE_INT, "lowportmax",
                   1896:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1897:                                    "to assign"),
1.70      atatat   1898:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1899:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1900:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1901: #endif /* IPNOPRIVPORTS */
1.73      atatat   1902:        sysctl_createv(clog, 0, NULL, NULL,
                   1903:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1904:                       CTLTYPE_INT, "use_tempaddr",
                   1905:                       SYSCTL_DESCR("Use temporary address"),
                   1906:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1907:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1908:                       CTL_CREATE, CTL_EOL);
                   1909:        sysctl_createv(clog, 0, NULL, NULL,
                   1910:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1911:                       CTLTYPE_INT, "temppltime",
                   1912:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1913:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1914:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1915:                       CTL_CREATE, CTL_EOL);
                   1916:        sysctl_createv(clog, 0, NULL, NULL,
                   1917:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1918:                       CTLTYPE_INT, "tempvltime",
                   1919:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1920:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1921:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1922:                       CTL_CREATE, CTL_EOL);
                   1923:        sysctl_createv(clog, 0, NULL, NULL,
                   1924:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1925:                       CTLTYPE_INT, "maxfrags",
                   1926:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1927:                       NULL, 0, &ip6_maxfrags, 0,
                   1928:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1929:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1930:        sysctl_createv(clog, 0, NULL, NULL,
                   1931:                       CTLFLAG_PERMANENT,
                   1932:                       CTLTYPE_STRUCT, "stats",
                   1933:                       SYSCTL_DESCR("IPv6 statistics"),
1.116   ! thorpej  1934:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1935:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1936:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1937:        sysctl_createv(clog, 0, NULL, NULL,
                   1938:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1939:                       CTLTYPE_INT, "use_defaultzone",
                   1940:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1941:                       NULL, 0, &ip6_use_defzone, 0,
                   1942:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1943:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1944:        sysctl_createv(clog, 0, NULL, NULL,
                   1945:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1946:                       CTLTYPE_INT, "mcast_pmtu",
                   1947:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1948:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1949:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1950:                       CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1951: #ifdef GATEWAY
                   1952:        sysctl_createv(clog, 0, NULL, NULL,
                   1953:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1954:                        CTLTYPE_INT, "maxflows",
                   1955:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1956:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1957:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1958:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1959:        sysctl_createv(clog, 0, NULL, NULL,
                   1960:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1961:                        CTLTYPE_INT, "hashsize",
                   1962:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1963:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1964:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1965:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1966: #endif
1.2       itojun   1967: }
1.116   ! thorpej  1968:
        !          1969: void
        !          1970: ip6_statinc(u_int stat)
        !          1971: {
        !          1972:
        !          1973:        KASSERT(stat < IP6_NSTATS);
        !          1974:        IP6_STATINC(stat);
        !          1975: }

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