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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.104

1.104   ! yamt        1: /*     $NetBSD$        */
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>
1.104   ! yamt       65: __KERNEL_RCSID(0, "$NetBSD$");
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>
1.2       itojun    105: #include <netinet6/in6_pcb.h>
1.14      itojun    106: #include <netinet/icmp6.h>
1.81      rpaulo    107: #include <netinet6/scope6_var.h>
1.2       itojun    108: #include <netinet6/in6_ifattach.h>
                    109: #include <netinet6/nd6.h>
                    110:
1.37      itojun    111: #ifdef IPSEC
                    112: #include <netinet6/ipsec.h>
                    113: #endif
                    114:
1.94      degroote  115: #ifdef FAST_IPSEC
                    116: #include <netipsec/ipsec.h>
                    117: #include <netipsec/ipsec6.h>
                    118: #include <netipsec/key.h>
                    119: #endif /* FAST_IPSEC */
                    120:
1.2       itojun    121: #include <netinet6/ip6protosw.h>
                    122:
                    123: #include "faith.h"
                    124: #include "gif.h"
1.50      itojun    125:
                    126: #if NGIF > 0
                    127: #include <netinet6/in6_gif.h>
                    128: #endif
1.2       itojun    129:
1.9       itojun    130: #include <net/net_osdep.h>
                    131:
1.2       itojun    132: extern struct domain inet6domain;
                    133:
                    134: u_char ip6_protox[IPPROTO_MAX];
                    135: static int ip6qmaxlen = IFQ_MAXLEN;
                    136: struct in6_ifaddr *in6_ifaddr;
                    137: struct ifqueue ip6intrq;
                    138:
1.83      rpaulo    139: extern struct callout in6_tmpaddrtimer_ch;
                    140:
1.2       itojun    141: int ip6_forward_srcrt;                 /* XXX */
                    142: int ip6_sourcecheck;                   /* XXX */
                    143: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    144:
1.29      thorpej   145: #ifdef PFIL_HOOKS
                    146: struct pfil_head inet6_pfil_hook;
                    147: #endif
                    148:
1.2       itojun    149: struct ip6stat ip6stat;
                    150:
                    151: static void ip6_init2 __P((void *));
1.81      rpaulo    152: static struct m_tag *ip6_setdstifaddr __P((struct mbuf *, struct in6_ifaddr *));
1.2       itojun    153:
1.5       itojun    154: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.62      itojun    155: static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int));
1.2       itojun    156:
                    157: /*
                    158:  * IP6 initialization: fill in IP6 protocol switch table.
                    159:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    160:  */
                    161: void
                    162: ip6_init()
                    163: {
1.78      christos  164:        const struct ip6protosw *pr;
1.35      itojun    165:        int i;
1.2       itojun    166:
1.78      christos  167:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    168:        if (pr == 0)
                    169:                panic("ip6_init");
                    170:        for (i = 0; i < IPPROTO_MAX; i++)
                    171:                ip6_protox[i] = pr - inet6sw;
1.78      christos  172:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    173:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    174:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    175:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    176:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    177:        ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81      rpaulo    178:        scope6_init();
                    179:        addrsel_policy_init();
1.2       itojun    180:        nd6_init();
                    181:        frag6_init();
1.83      rpaulo    182:        ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    183:
                    184:        ip6_init2((void *)0);
1.98      liamjfoy  185: #ifdef GATEWAY
1.99      liamjfoy  186:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  187: #endif
1.29      thorpej   188:
                    189: #ifdef PFIL_HOOKS
                    190:        /* Register our Packet Filter hook. */
1.33      thorpej   191:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    192:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   193:        i = pfil_head_register(&inet6_pfil_hook);
                    194:        if (i != 0)
                    195:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    196:                    "error %d\n", i);
                    197: #endif /* PFIL_HOOKS */
1.2       itojun    198: }
                    199:
                    200: static void
1.90      christos  201: ip6_init2(void *dummy)
1.2       itojun    202: {
                    203:
                    204:        /* nd6_timer_init */
1.19      thorpej   205:        callout_init(&nd6_timer_ch);
                    206:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    207:
                    208:        /* timer for regeneranation of temporary addresses randomize ID */
                    209:        callout_init(&in6_tmpaddrtimer_ch);
                    210:        callout_reset(&in6_tmpaddrtimer_ch,
                    211:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    212:                       ip6_temp_regen_advance) * hz,
                    213:                      in6_tmpaddrtimer, NULL);
1.2       itojun    214: }
                    215:
                    216: /*
                    217:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    218:  */
                    219: void
                    220: ip6intr()
                    221: {
                    222:        int s;
                    223:        struct mbuf *m;
                    224:
                    225:        for (;;) {
1.41      thorpej   226:                s = splnet();
1.2       itojun    227:                IF_DEQUEUE(&ip6intrq, m);
                    228:                splx(s);
                    229:                if (m == 0)
                    230:                        return;
1.83      rpaulo    231:                /* drop the packet if IPv6 operation is disabled on the IF */
                    232:                if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    233:                        m_freem(m);
                    234:                        return;
                    235:                }
1.2       itojun    236:                ip6_input(m);
                    237:        }
                    238: }
                    239:
1.103     dyoung    240: extern struct  route ip6_forward_rt;
1.2       itojun    241:
                    242: void
1.96      dyoung    243: ip6_input(struct mbuf *m)
1.2       itojun    244: {
1.9       itojun    245:        struct ip6_hdr *ip6;
1.2       itojun    246:        int off = sizeof(struct ip6_hdr), nest;
                    247:        u_int32_t plen;
1.5       itojun    248:        u_int32_t rtalert = ~0;
1.104   ! yamt      249:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    250:        struct ifnet *deliverifp = NULL;
1.64      itojun    251:        int srcrt = 0;
1.103     dyoung    252:        const struct sockaddr_in6 *cdst;
1.94      degroote  253: #ifdef FAST_IPSEC
                    254:        struct m_tag *mtag;
                    255:        struct tdb_ident *tdbi;
                    256:        struct secpolicy *sp;
                    257:        int s, error;
                    258: #endif
1.2       itojun    259:
                    260: #ifdef IPSEC
                    261:        /*
                    262:         * should the inner packet be considered authentic?
                    263:         * see comment in ah4_input().
                    264:         */
1.49      itojun    265:        m->m_flags &= ~M_AUTHIPHDR;
                    266:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    267: #endif
1.9       itojun    268:
1.2       itojun    269:        /*
1.81      rpaulo    270:         * make sure we don't have onion peering information into m_tag.
                    271:         */
                    272:        ip6_delaux(m);
                    273:
                    274:        /*
1.44      itojun    275:         * mbuf statistics
1.2       itojun    276:         */
                    277:        if (m->m_flags & M_EXT) {
                    278:                if (m->m_next)
                    279:                        ip6stat.ip6s_mext2m++;
                    280:                else
                    281:                        ip6stat.ip6s_mext1++;
                    282:        } else {
1.96      dyoung    283: #define M2MMAX __arraycount(ip6stat.ip6s_m2m)
1.2       itojun    284:                if (m->m_next) {
1.9       itojun    285:                        if (m->m_flags & M_LOOP) {
1.77      peter     286:                                ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */
1.40      itojun    287:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    288:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    289:                        else
                    290:                                ip6stat.ip6s_m2m[0]++;
                    291:                } else
                    292:                        ip6stat.ip6s_m1++;
1.40      itojun    293: #undef M2MMAX
1.2       itojun    294:        }
                    295:
1.9       itojun    296:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    297:        ip6stat.ip6s_total++;
                    298:
1.57      thorpej   299:        /*
                    300:         * If the IPv6 header is not aligned, slurp it up into a new
                    301:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    302:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   303:         * IPv6 header is in the first mbuf of the chain.
                    304:         */
1.97      christos  305:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   306:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    307:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    308:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    309:                        /* XXXJRT new stat, please */
                    310:                        ip6stat.ip6s_toosmall++;
                    311:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    312:                        return;
                    313:                }
                    314:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    315:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    316:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9       itojun    317:                        ip6stat.ip6s_toosmall++;
                    318:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    319:                        return;
                    320:                }
1.2       itojun    321:        }
                    322:
                    323:        ip6 = mtod(m, struct ip6_hdr *);
                    324:
                    325:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    326:                ip6stat.ip6s_badvers++;
1.9       itojun    327:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    328:                goto bad;
                    329:        }
1.15      darrenr   330:
1.98      liamjfoy  331: #if defined(IPSEC)
                    332:        /* IPv6 fast forwarding is not compatible with IPsec. */
                    333:        m->m_flags &= ~M_CANFASTFWD;
                    334: #else
                    335:        /*
                    336:         * Assume that we can create a fast-forward IP flow entry
                    337:         * based on this packet.
                    338:         */
                    339:        m->m_flags |= M_CANFASTFWD;
                    340: #endif
                    341:
1.15      darrenr   342: #ifdef PFIL_HOOKS
                    343:        /*
                    344:         * Run through list of hooks for input packets.  If there are any
                    345:         * filters which require that additional packets in the flow are
                    346:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    347:         * Note that filters must _never_ set this flag, as another filter
                    348:         * in the list may have previously cleared it.
                    349:         */
1.39      itojun    350:        /*
                    351:         * let ipfilter look at packet on the wire,
                    352:         * not the decapsulated packet.
                    353:         */
                    354: #ifdef IPSEC
1.42      itojun    355:        if (!ipsec_getnhist(m))
1.94      degroote  356: #elif defined(FAST_IPSEC)
                    357:        if (!ipsec_indone(m))
1.39      itojun    358: #else
                    359:        if (1)
                    360: #endif
                    361:        {
1.64      itojun    362:                struct in6_addr odst;
                    363:
                    364:                odst = ip6->ip6_dst;
1.39      itojun    365:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    366:                                   PFIL_IN) != 0)
                    367:                        return;
                    368:                if (m == NULL)
                    369:                        return;
                    370:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    371:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    372:        }
1.15      darrenr   373: #endif /* PFIL_HOOKS */
                    374:
1.2       itojun    375:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    376:
1.30      thorpej   377: #ifdef ALTQ
                    378:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    379:                /* packet is dropped by traffic conditioner */
                    380:                return;
1.9       itojun    381:        }
                    382: #endif
                    383:
1.2       itojun    384:        /*
1.44      itojun    385:         * Check against address spoofing/corruption.
1.2       itojun    386:         */
                    387:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    388:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    389:                /*
                    390:                 * XXX: "badscope" is not very suitable for a multicast source.
                    391:                 */
1.2       itojun    392:                ip6stat.ip6s_badscope++;
1.9       itojun    393:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    394:                goto bad;
                    395:        }
1.13      itojun    396:        /*
1.44      itojun    397:         * The following check is not documented in specs.  A malicious
                    398:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    399:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    400:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    401:         *
1.44      itojun    402:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    403:         * support IPv4-less kernel compilation, we cannot support SIIT
                    404:         * environment at all.  So, it makes more sense for us to reject any
                    405:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       406:         * partial support for SIIT environment.
1.13      itojun    407:         */
                    408:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    409:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    410:                ip6stat.ip6s_badscope++;
                    411:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    412:                goto bad;
                    413:        }
1.17      itojun    414: #if 0
1.13      itojun    415:        /*
1.17      itojun    416:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    417:         *
                    418:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    419:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    420:         * is revised to forbid relaying case.
1.13      itojun    421:         */
                    422:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    423:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    424:                ip6stat.ip6s_badscope++;
                    425:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    426:                goto bad;
                    427:        }
                    428: #endif
1.35      itojun    429:
1.2       itojun    430:        /*
1.82      yamt      431:         * Disambiguate address scope zones (if there is ambiguity).
                    432:         * We first make sure that the original source or destination address
                    433:         * is not in our internal form for scoped addresses.  Such addresses
                    434:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    435:         * to the usage conflict.
                    436:         * in6_setscope() then also checks and rejects the cases where src or
                    437:         * dst are the loopback address and the receiving interface
                    438:         * is not loopback.
                    439:         */
1.88      bouyer    440:        if (__predict_false(
                    441:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    442:                goto bad;
                    443:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      444:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
                    445:                ip6stat.ip6s_badscope++; /* XXX */
                    446:                goto bad;
                    447:        }
                    448:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    449:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
                    450:                ip6stat.ip6s_badscope++;
                    451:                goto bad;
                    452:        }
                    453:
                    454:        /*
1.2       itojun    455:         * Multicast check
                    456:         */
                    457:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    458:                struct  in6_multi *in6m = 0;
1.9       itojun    459:
                    460:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    461:                /*
                    462:                 * See if we belong to the destination multicast group on the
                    463:                 * arrival interface.
                    464:                 */
                    465:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    466:                if (in6m)
                    467:                        ours = 1;
                    468:                else if (!ip6_mrouter) {
                    469:                        ip6stat.ip6s_notmember++;
                    470:                        ip6stat.ip6s_cantforward++;
1.9       itojun    471:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    472:                        goto bad;
                    473:                }
1.9       itojun    474:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    475:                goto hbhcheck;
                    476:        }
                    477:
1.103     dyoung    478:        cdst = satocsin6(rtcache_getdst(&ip6_forward_rt));
1.2       itojun    479:        /*
                    480:         *  Unicast check
                    481:         */
1.103     dyoung    482:        if (cdst == NULL)
                    483:                ;
                    484:        else if (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &cdst->sin6_addr))
                    485:                rtcache_free(&ip6_forward_rt);
1.93      joerg     486:        else
1.103     dyoung    487:                rtcache_check(&ip6_forward_rt);
1.93      joerg     488:        if (ip6_forward_rt.ro_rt != NULL) {
                    489:                /* XXX Revalidated route is accounted wrongly. */
1.25      itojun    490:                ip6stat.ip6s_forward_cachehit++;
1.93      joerg     491:        } else {
1.103     dyoung    492:                union {
                    493:                        struct sockaddr         dst;
                    494:                        struct sockaddr_in6     dst6;
                    495:                } u;
1.35      itojun    496:
1.93      joerg     497:                ip6stat.ip6s_forward_cachemiss++;
1.22      itojun    498:
1.103     dyoung    499:                sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    500:                rtcache_setdst(&ip6_forward_rt, &u.dst);
1.2       itojun    501:
1.103     dyoung    502:                rtcache_init(&ip6_forward_rt);
1.2       itojun    503:        }
                    504:
                    505: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    506:
                    507:        /*
                    508:         * Accept the packet if the forwarding interface to the destination
                    509:         * according to the routing table is the loopback interface,
                    510:         * unless the associated route has a gateway.
                    511:         * Note that this approach causes to accept a packet if there is a
                    512:         * route to the loopback interface for the destination of the packet.
                    513:         * But we think it's even useful in some situations, e.g. when using
                    514:         * a special daemon which wants to intercept the packet.
                    515:         */
1.91      dyoung    516:        if (ip6_forward_rt.ro_rt != NULL &&
1.2       itojun    517:            (ip6_forward_rt.ro_rt->rt_flags &
                    518:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
1.55      itojun    519:            !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
1.2       itojun    520: #if 0
                    521:            /*
                    522:             * The check below is redundant since the comparison of
                    523:             * the destination and the key of the rtentry has
                    524:             * already done through looking up the routing table.
                    525:             */
                    526:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
1.55      itojun    527:            &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
1.2       itojun    528: #endif
1.9       itojun    529:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    530:                struct in6_ifaddr *ia6 =
                    531:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    532:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    533:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    534:                /*
                    535:                 * packets to a tentative, duplicated, or somehow invalid
                    536:                 * address must not be accepted.
                    537:                 */
1.2       itojun    538:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    539:                        /* this address is ready */
1.2       itojun    540:                        ours = 1;
1.9       itojun    541:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    542:                        goto hbhcheck;
                    543:                } else {
1.24      itojun    544:                        /* address is not ready, so discard the packet. */
1.34      itojun    545:                        nd6log((LOG_INFO,
1.27      itojun    546:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    547:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    548:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    549:
                    550:                        goto bad;
1.2       itojun    551:                }
                    552:        }
                    553:
                    554:        /*
1.55      itojun    555:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    556:         */
                    557: #if defined(NFAITH) && 0 < NFAITH
                    558:        if (ip6_keepfaith) {
1.91      dyoung    559:                if (ip6_forward_rt.ro_rt != NULL &&
                    560:                    ip6_forward_rt.ro_rt->rt_ifp != NULL &&
1.71      itojun    561:                    ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    562:                        /* XXX do we need more sanity checks? */
                    563:                        ours = 1;
1.45      itojun    564:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
1.9       itojun    565:                        goto hbhcheck;
                    566:                }
                    567:        }
                    568: #endif
                    569:
                    570: #if 0
                    571:     {
                    572:        /*
                    573:         * Last resort: check in6_ifaddr for incoming interface.
                    574:         * The code is here until I update the "goto ours hack" code above
                    575:         * working right.
                    576:         */
                    577:        struct ifaddr *ifa;
1.91      dyoung    578:        TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
1.9       itojun    579:                if (ifa->ifa_addr == NULL)
                    580:                        continue;       /* just for safety */
                    581:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    582:                        continue;
                    583:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    584:                        ours = 1;
                    585:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    586:                        goto hbhcheck;
                    587:                }
                    588:        }
1.9       itojun    589:     }
1.2       itojun    590: #endif
                    591:
                    592:        /*
                    593:         * Now there is no reason to process the packet if it's not our own
                    594:         * and we're not a router.
                    595:         */
                    596:        if (!ip6_forwarding) {
                    597:                ip6stat.ip6s_cantforward++;
1.9       itojun    598:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    599:                goto bad;
                    600:        }
                    601:
                    602:   hbhcheck:
                    603:        /*
1.81      rpaulo    604:         * record address information into m_tag, if we don't have one yet.
                    605:         * note that we are unable to record it, if the address is not listed
                    606:         * as our interface address (e.g. multicast addresses, addresses
                    607:         * within FAITH prefixes and such).
                    608:         */
                    609:        if (deliverifp && !ip6_getdstifaddr(m)) {
                    610:                struct in6_ifaddr *ia6;
                    611:
                    612:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    613:                if (ia6) {
                    614:                        if (!ip6_setdstifaddr(m, ia6)) {
                    615:                                /*
                    616:                                 * XXX maybe we should drop the packet here,
                    617:                                 * as we could not provide enough information
                    618:                                 * to the upper layers.
                    619:                                 */
                    620:                        }
                    621:                }
                    622:        }
                    623:
                    624:        /*
1.2       itojun    625:         * Process Hop-by-Hop options header if it's contained.
                    626:         * m may be modified in ip6_hopopts_input().
                    627:         * If a JumboPayload option is included, plen will also be modified.
                    628:         */
                    629:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    630:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    631:                struct ip6_hbh *hbh;
                    632:
                    633:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    634: #if 0  /*touches NULL pointer*/
                    635:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    636: #endif
1.2       itojun    637:                        return; /* m have already been freed */
1.9       itojun    638:                }
1.22      itojun    639:
1.2       itojun    640:                /* adjust pointer */
                    641:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    642:
                    643:                /*
1.49      itojun    644:                 * if the payload length field is 0 and the next header field
1.22      itojun    645:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    646:                 * option MUST be included.
                    647:                 */
                    648:                if (ip6->ip6_plen == 0 && plen == 0) {
                    649:                        /*
                    650:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    651:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    652:                         * (non-zero) payload length to the variable plen.
1.22      itojun    653:                         */
                    654:                        ip6stat.ip6s_badoptions++;
                    655:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    656:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    657:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    658:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  659:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    660:                        return;
                    661:                }
1.9       itojun    662:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    663:                        sizeof(struct ip6_hbh));
                    664:                if (hbh == NULL) {
                    665:                        ip6stat.ip6s_tooshort++;
                    666:                        return;
                    667:                }
1.57      thorpej   668:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    669:                nxt = hbh->ip6h_nxt;
1.2       itojun    670:
                    671:                /*
                    672:                 * accept the packet if a router alert option is included
                    673:                 * and we act as an IPv6 router.
                    674:                 */
1.5       itojun    675:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    676:                        ours = 1;
                    677:        } else
                    678:                nxt = ip6->ip6_nxt;
                    679:
                    680:        /*
                    681:         * Check that the amount of data in the buffers
                    682:         * is as at least much as the IPv6 header would have us expect.
                    683:         * Trim mbufs if longer than we expect.
                    684:         * Drop packet if shorter than we expect.
                    685:         */
                    686:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    687:                ip6stat.ip6s_tooshort++;
1.9       itojun    688:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    689:                goto bad;
                    690:        }
                    691:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    692:                if (m->m_len == m->m_pkthdr.len) {
                    693:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    694:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    695:                } else
                    696:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    697:        }
                    698:
                    699:        /*
                    700:         * Forward if desirable.
                    701:         */
                    702:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    703:                /*
                    704:                 * If we are acting as a multicast router, all
                    705:                 * incoming multicast packets are passed to the
                    706:                 * kernel-level multicast forwarding function.
                    707:                 * The packet is returned (relatively) intact; if
                    708:                 * ip6_mforward() returns a non-zero value, the packet
                    709:                 * must be discarded, else it may be accepted below.
                    710:                 */
                    711:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    712:                        ip6stat.ip6s_cantforward++;
                    713:                        m_freem(m);
                    714:                        return;
                    715:                }
                    716:                if (!ours) {
                    717:                        m_freem(m);
                    718:                        return;
                    719:                }
1.22      itojun    720:        } else if (!ours) {
1.64      itojun    721:                ip6_forward(m, srcrt);
1.2       itojun    722:                return;
1.56      itojun    723:        }
1.25      itojun    724:
                    725:        ip6 = mtod(m, struct ip6_hdr *);
                    726:
                    727:        /*
                    728:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    729:         * tcp/udp stack and bypass security checks (act as if it was from
                    730:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    731:         *
                    732:         * For SIIT end node behavior, you may want to disable the check.
                    733:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    734:         * source.
                    735:         */
                    736:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    737:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    738:                ip6stat.ip6s_badscope++;
                    739:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    740:                goto bad;
                    741:        }
1.2       itojun    742:
                    743:        /*
                    744:         * Tell launch routine the next header
                    745:         */
1.12      itojun    746: #ifdef IFA_STATS
1.28      itojun    747:        if (deliverifp != NULL) {
1.9       itojun    748:                struct in6_ifaddr *ia6;
                    749:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    750:                if (ia6)
                    751:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    752:        }
                    753: #endif
1.2       itojun    754:        ip6stat.ip6s_delivered++;
1.9       itojun    755:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    756:        nest = 0;
1.40      itojun    757:
1.104   ! yamt      758:        rh_present = 0;
1.2       itojun    759:        while (nxt != IPPROTO_DONE) {
                    760:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    761:                        ip6stat.ip6s_toomanyhdr++;
1.104   ! yamt      762:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    763:                        goto bad;
                    764:                }
1.8       itojun    765:
                    766:                /*
                    767:                 * protection against faulty packet - there should be
                    768:                 * more sanity checks in header chain processing.
                    769:                 */
                    770:                if (m->m_pkthdr.len < off) {
                    771:                        ip6stat.ip6s_tooshort++;
1.9       itojun    772:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    773:                        goto bad;
                    774:                }
                    775:
1.104   ! yamt      776:                if (nxt == IPPROTO_ROUTING) {
        !           777:                        if (rh_present++) {
        !           778:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
        !           779:                                    ifs6_in_hdrerr);
        !           780:                                ip6stat.ip6s_badoptions++;
        !           781:                                goto bad;
        !           782:                        }
        !           783:                }
        !           784:
1.37      itojun    785: #ifdef 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[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    792:                    ipsec6_in_reject(m, NULL)) {
                    793:                        ipsec6stat.in_polvio++;
                    794:                        goto bad;
                    795:                }
                    796: #endif
1.94      degroote  797: #ifdef FAST_IPSEC
                    798:        /*
                    799:         * enforce IPsec policy checking if we are seeing last header.
                    800:         * note that we do not visit this with protocols with pcb layer
                    801:         * code - like udp/tcp/raw ip.
                    802:         */
                    803:        if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
                    804:                /*
                    805:                 * Check if the packet has already had IPsec processing
                    806:                 * done.  If so, then just pass it along.  This tag gets
                    807:                 * set during AH, ESP, etc. input handling, before the
                    808:                 * packet is returned to the ip input queue for delivery.
                    809:                 */
                    810:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    811:                s = splsoftnet();
                    812:                if (mtag != NULL) {
                    813:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    814:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    815:                } else {
                    816:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    817:                                                                        IP_FORWARDING, &error);
                    818:                }
                    819:                if (sp != NULL) {
                    820:                        /*
                    821:                         * Check security policy against packet attributes.
                    822:                         */
                    823:                        error = ipsec_in_reject(sp, m);
                    824:                        KEY_FREESP(&sp);
                    825:                } else {
                    826:                        /* XXX error stat??? */
                    827:                        error = EINVAL;
                    828:                        DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
                    829:                        goto bad;
                    830:                }
                    831:                splx(s);
                    832:                if (error)
                    833:                        goto bad;
                    834:        }
                    835: #endif /* FAST_IPSEC */
                    836:
1.56      itojun    837:
1.2       itojun    838:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    839:        }
                    840:        return;
                    841:  bad:
                    842:        m_freem(m);
                    843: }
                    844:
                    845: /*
1.81      rpaulo    846:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    847:  */
                    848: static struct m_tag *
                    849: ip6_setdstifaddr(m, ia6)
                    850:        struct mbuf *m;
                    851:        struct in6_ifaddr *ia6;
                    852: {
                    853:        struct m_tag *mtag;
                    854:
                    855:        mtag = ip6_addaux(m);
                    856:        if (mtag)
                    857:                ((struct ip6aux *)(mtag + 1))->ip6a_dstia6 = ia6;
                    858:        return mtag;    /* NULL if failed to set */
                    859: }
                    860:
                    861: struct in6_ifaddr *
                    862: ip6_getdstifaddr(m)
                    863:        struct mbuf *m;
                    864: {
                    865:        struct m_tag *mtag;
                    866:
                    867:        mtag = ip6_findaux(m);
                    868:        if (mtag)
                    869:                return ((struct ip6aux *)(mtag + 1))->ip6a_dstia6;
                    870:        else
                    871:                return NULL;
                    872: }
                    873:
                    874: /*
1.2       itojun    875:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    876:  * included, the real payload length will be stored in plenp.
                    877:  */
                    878: static int
                    879: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    880:        u_int32_t *plenp;
1.5       itojun    881:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    882:        struct mbuf **mp;
                    883:        int *offp;
                    884: {
1.35      itojun    885:        struct mbuf *m = *mp;
1.2       itojun    886:        int off = *offp, hbhlen;
                    887:        struct ip6_hbh *hbh;
                    888:
                    889:        /* validation of the length of the header */
1.9       itojun    890:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    891:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    892:        if (hbh == NULL) {
                    893:                ip6stat.ip6s_tooshort++;
                    894:                return -1;
                    895:        }
                    896:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    897:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    898:                hbhlen);
                    899:        if (hbh == NULL) {
                    900:                ip6stat.ip6s_tooshort++;
                    901:                return -1;
                    902:        }
1.57      thorpej   903:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    904:        off += hbhlen;
                    905:        hbhlen -= sizeof(struct ip6_hbh);
                    906:
                    907:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    908:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    909:                return (-1);
1.2       itojun    910:
                    911:        *offp = off;
                    912:        *mp = m;
1.58      itojun    913:        return (0);
1.2       itojun    914: }
                    915:
                    916: /*
                    917:  * Search header for all Hop-by-hop options and process each option.
                    918:  * This function is separate from ip6_hopopts_input() in order to
                    919:  * handle a case where the sending node itself process its hop-by-hop
                    920:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    921:  *
                    922:  * The function assumes that hbh header is located right after the IPv6 header
                    923:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    924:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    925:  */
                    926: int
                    927: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    928:        struct mbuf *m;
                    929:        u_int8_t *opthead;
                    930:        int hbhlen;
1.5       itojun    931:        u_int32_t *rtalertp;
1.2       itojun    932:        u_int32_t *plenp;
                    933: {
                    934:        struct ip6_hdr *ip6;
                    935:        int optlen = 0;
                    936:        u_int8_t *opt = opthead;
                    937:        u_int16_t rtalert_val;
1.22      itojun    938:        u_int32_t jumboplen;
1.55      itojun    939:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    940:
                    941:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    942:                switch (*opt) {
                    943:                case IP6OPT_PAD1:
                    944:                        optlen = 1;
                    945:                        break;
                    946:                case IP6OPT_PADN:
                    947:                        if (hbhlen < IP6OPT_MINLEN) {
                    948:                                ip6stat.ip6s_toosmall++;
                    949:                                goto bad;
                    950:                        }
                    951:                        optlen = *(opt + 1) + 2;
                    952:                        break;
                    953:                case IP6OPT_RTALERT:
                    954:                        /* XXX may need check for alignment */
                    955:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    956:                                ip6stat.ip6s_toosmall++;
                    957:                                goto bad;
                    958:                        }
                    959:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    960:                                /* XXX stat */
                    961:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    962:                                    ICMP6_PARAMPROB_HEADER,
                    963:                                    erroff + opt + 1 - opthead);
                    964:                                return (-1);
1.35      itojun    965:                        }
                    966:                        optlen = IP6OPT_RTALERT_LEN;
1.97      christos  967:                        bcopy((void *)(opt + 2), (void *)&rtalert_val, 2);
1.35      itojun    968:                        *rtalertp = ntohs(rtalert_val);
                    969:                        break;
                    970:                case IP6OPT_JUMBO:
1.22      itojun    971:                        /* XXX may need check for alignment */
                    972:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    973:                                ip6stat.ip6s_toosmall++;
                    974:                                goto bad;
                    975:                        }
1.35      itojun    976:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    977:                                /* XXX stat */
                    978:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    979:                                    ICMP6_PARAMPROB_HEADER,
                    980:                                    erroff + opt + 1 - opthead);
                    981:                                return (-1);
1.35      itojun    982:                        }
1.22      itojun    983:                        optlen = IP6OPT_JUMBO_LEN;
                    984:
                    985:                        /*
                    986:                         * IPv6 packets that have non 0 payload length
1.35      itojun    987:                         * must not contain a jumbo payload option.
1.22      itojun    988:                         */
                    989:                        ip6 = mtod(m, struct ip6_hdr *);
                    990:                        if (ip6->ip6_plen) {
                    991:                                ip6stat.ip6s_badoptions++;
                    992:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    993:                                    ICMP6_PARAMPROB_HEADER,
                    994:                                    erroff + opt - opthead);
                    995:                                return (-1);
1.22      itojun    996:                        }
1.2       itojun    997:
1.22      itojun    998:                        /*
                    999:                         * We may see jumbolen in unaligned location, so
                   1000:                         * we'd need to perform bcopy().
                   1001:                         */
                   1002:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                   1003:                        jumboplen = (u_int32_t)htonl(jumboplen);
                   1004:
                   1005: #if 1
                   1006:                        /*
                   1007:                         * if there are multiple jumbo payload options,
                   1008:                         * *plenp will be non-zero and the packet will be
                   1009:                         * rejected.
                   1010:                         * the behavior may need some debate in ipngwg -
                   1011:                         * multiple options does not make sense, however,
                   1012:                         * there's no explicit mention in specification.
                   1013:                         */
                   1014:                        if (*plenp != 0) {
                   1015:                                ip6stat.ip6s_badoptions++;
                   1016:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1017:                                    ICMP6_PARAMPROB_HEADER,
                   1018:                                    erroff + opt + 2 - opthead);
                   1019:                                return (-1);
1.22      itojun   1020:                        }
1.8       itojun   1021: #endif
1.2       itojun   1022:
1.22      itojun   1023:                        /*
                   1024:                         * jumbo payload length must be larger than 65535.
                   1025:                         */
                   1026:                        if (jumboplen <= IPV6_MAXPACKET) {
                   1027:                                ip6stat.ip6s_badoptions++;
                   1028:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1029:                                    ICMP6_PARAMPROB_HEADER,
                   1030:                                    erroff + opt + 2 - opthead);
                   1031:                                return (-1);
1.22      itojun   1032:                        }
                   1033:                        *plenp = jumboplen;
                   1034:
                   1035:                        break;
1.35      itojun   1036:                default:                /* unknown option */
                   1037:                        if (hbhlen < IP6OPT_MINLEN) {
                   1038:                                ip6stat.ip6s_toosmall++;
                   1039:                                goto bad;
                   1040:                        }
1.55      itojun   1041:                        optlen = ip6_unknown_opt(opt, m,
                   1042:                            erroff + opt - opthead);
                   1043:                        if (optlen == -1)
                   1044:                                return (-1);
1.35      itojun   1045:                        optlen += 2;
                   1046:                        break;
1.2       itojun   1047:                }
                   1048:        }
                   1049:
1.55      itojun   1050:        return (0);
1.2       itojun   1051:
                   1052:   bad:
                   1053:        m_freem(m);
1.55      itojun   1054:        return (-1);
1.2       itojun   1055: }
                   1056:
                   1057: /*
                   1058:  * Unknown option processing.
                   1059:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1060:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1061:  * is not continuous in order to return an ICMPv6 error.
                   1062:  */
                   1063: int
                   1064: ip6_unknown_opt(optp, m, off)
                   1065:        u_int8_t *optp;
                   1066:        struct mbuf *m;
                   1067:        int off;
                   1068: {
                   1069:        struct ip6_hdr *ip6;
                   1070:
1.35      itojun   1071:        switch (IP6OPT_TYPE(*optp)) {
                   1072:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1073:                return ((int)*(optp + 1));
1.35      itojun   1074:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1075:                m_freem(m);
1.58      itojun   1076:                return (-1);
1.35      itojun   1077:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                   1078:                ip6stat.ip6s_badoptions++;
                   1079:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1080:                return (-1);
1.35      itojun   1081:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                   1082:                ip6stat.ip6s_badoptions++;
                   1083:                ip6 = mtod(m, struct ip6_hdr *);
                   1084:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1085:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1086:                        m_freem(m);
                   1087:                else
                   1088:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1089:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1090:                return (-1);
1.2       itojun   1091:        }
                   1092:
                   1093:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1094:        return (-1);
1.2       itojun   1095: }
                   1096:
                   1097: /*
1.9       itojun   1098:  * Create the "control" list for this pcb.
                   1099:  *
                   1100:  * The routine will be called from upper layer handlers like tcp6_input().
                   1101:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1102:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1103:  * very first mbuf on the mbuf chain.
                   1104:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1105:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1106:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1107:  */
                   1108: void
                   1109: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun   1110:        struct in6pcb *in6p;
                   1111:        struct mbuf **mp;
                   1112:        struct ip6_hdr *ip6;
                   1113:        struct mbuf *m;
1.2       itojun   1114: {
1.85      rpaulo   1115: #ifdef RFC2292
                   1116: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1117: #else
                   1118: #define IS2292(x, y)   (y)
                   1119: #endif
                   1120:
1.9       itojun   1121: #ifdef SO_TIMESTAMP
1.2       itojun   1122:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1123:                struct timeval tv;
                   1124:
                   1125:                microtime(&tv);
1.97      christos 1126:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1127:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1128:                if (*mp)
                   1129:                        mp = &(*mp)->m_next;
                   1130:        }
1.9       itojun   1131: #endif
1.87      rpaulo   1132:
                   1133:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1134:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1135:                return;
                   1136:
1.2       itojun   1137:        /* RFC 2292 sec. 5 */
1.35      itojun   1138:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1139:                struct in6_pktinfo pi6;
1.85      rpaulo   1140:
1.2       itojun   1141:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1.81      rpaulo   1142:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1143:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1144:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1145:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1146:                    sizeof(struct in6_pktinfo),
                   1147:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1148:                if (*mp)
                   1149:                        mp = &(*mp)->m_next;
                   1150:        }
1.85      rpaulo   1151:
1.2       itojun   1152:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1153:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1154:
1.97      christos 1155:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1156:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1157:                if (*mp)
                   1158:                        mp = &(*mp)->m_next;
                   1159:        }
                   1160:
                   1161:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1162:                u_int32_t flowinfo;
                   1163:                int tclass;
                   1164:
                   1165:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1166:                flowinfo >>= 20;
                   1167:
                   1168:                tclass = flowinfo & 0xff;
1.97      christos 1169:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1170:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1171:
1.2       itojun   1172:                if (*mp)
                   1173:                        mp = &(*mp)->m_next;
                   1174:        }
                   1175:
                   1176:        /*
1.75      itojun   1177:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1178:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1179:         * strict, since there might be some hop-by-hop options which can be
                   1180:         * returned to normal user.
1.85      rpaulo   1181:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1182:         */
1.75      itojun   1183:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1184:                /*
                   1185:                 * Check if a hop-by-hop options header is contatined in the
                   1186:                 * received packet, and if so, store the options as ancillary
                   1187:                 * data. Note that a hop-by-hop options header must be
                   1188:                 * just after the IPv6 header, which fact is assured through
                   1189:                 * the IPv6 input processing.
                   1190:                 */
1.78      christos 1191:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1192:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1193:                        struct ip6_hbh *hbh;
                   1194:                        int hbhlen;
1.62      itojun   1195:                        struct mbuf *ext;
1.9       itojun   1196:
1.62      itojun   1197:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1198:                            xip6->ip6_nxt);
1.62      itojun   1199:                        if (ext == NULL) {
1.9       itojun   1200:                                ip6stat.ip6s_tooshort++;
                   1201:                                return;
                   1202:                        }
1.62      itojun   1203:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1204:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1205:                        if (hbhlen != ext->m_len) {
                   1206:                                m_freem(ext);
1.9       itojun   1207:                                ip6stat.ip6s_tooshort++;
                   1208:                                return;
                   1209:                        }
1.2       itojun   1210:
                   1211:                        /*
                   1212:                         * XXX: We copy whole the header even if a jumbo
                   1213:                         * payload option is included, which option is to
                   1214:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1215:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1216:                         */
1.97      christos 1217:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1218:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1219:                            IPPROTO_IPV6);
1.2       itojun   1220:                        if (*mp)
                   1221:                                mp = &(*mp)->m_next;
1.62      itojun   1222:                        m_freem(ext);
1.2       itojun   1223:                }
                   1224:        }
                   1225:
                   1226:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1227:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1228:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1229:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1230:
                   1231:                /*
                   1232:                 * Search for destination options headers or routing
                   1233:                 * header(s) through the header chain, and stores each
                   1234:                 * header as ancillary data.
                   1235:                 * Note that the order of the headers remains in
                   1236:                 * the chain of ancillary data.
                   1237:                 */
1.86      rpaulo   1238:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1239:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1240:                        int elen;
1.62      itojun   1241:                        struct mbuf *ext = NULL;
1.9       itojun   1242:
1.62      itojun   1243:                        /*
                   1244:                         * if it is not an extension header, don't try to
                   1245:                         * pull it from the chain.
                   1246:                         */
                   1247:                        switch (nxt) {
                   1248:                        case IPPROTO_DSTOPTS:
                   1249:                        case IPPROTO_ROUTING:
                   1250:                        case IPPROTO_HOPOPTS:
                   1251:                        case IPPROTO_AH: /* is it possible? */
                   1252:                                break;
                   1253:                        default:
                   1254:                                goto loopend;
                   1255:                        }
                   1256:
                   1257:                        ext = ip6_pullexthdr(m, off, nxt);
                   1258:                        if (ext == NULL) {
1.9       itojun   1259:                                ip6stat.ip6s_tooshort++;
                   1260:                                return;
                   1261:                        }
1.62      itojun   1262:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1263:                        if (nxt == IPPROTO_AH)
                   1264:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1265:                        else
                   1266:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1267:                        if (elen != ext->m_len) {
                   1268:                                m_freem(ext);
1.9       itojun   1269:                                ip6stat.ip6s_tooshort++;
                   1270:                                return;
                   1271:                        }
1.57      thorpej  1272:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1273:
1.35      itojun   1274:                        switch (nxt) {
1.62      itojun   1275:                        case IPPROTO_DSTOPTS:
1.35      itojun   1276:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1277:                                        break;
                   1278:
1.97      christos 1279:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1280:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1281:                                    IPPROTO_IPV6);
1.35      itojun   1282:                                if (*mp)
                   1283:                                        mp = &(*mp)->m_next;
                   1284:                                break;
                   1285:
                   1286:                        case IPPROTO_ROUTING:
                   1287:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1288:                                        break;
                   1289:
1.97      christos 1290:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1291:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1292:                                    IPPROTO_IPV6);
1.35      itojun   1293:                                if (*mp)
                   1294:                                        mp = &(*mp)->m_next;
                   1295:                                break;
                   1296:
1.62      itojun   1297:                        case IPPROTO_HOPOPTS:
                   1298:                        case IPPROTO_AH: /* is it possible? */
                   1299:                                break;
                   1300:
1.35      itojun   1301:                        default:
                   1302:                                /*
1.62      itojun   1303:                                 * other cases have been filtered in the above.
                   1304:                                 * none will visit this case.  here we supply
                   1305:                                 * the code just in case (nxt overwritten or
                   1306:                                 * other cases).
1.35      itojun   1307:                                 */
1.62      itojun   1308:                                m_freem(ext);
1.35      itojun   1309:                                goto loopend;
                   1310:
1.2       itojun   1311:                        }
                   1312:
                   1313:                        /* proceed with the next header. */
1.9       itojun   1314:                        off += elen;
1.2       itojun   1315:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1316:                        ip6e = NULL;
                   1317:                        m_freem(ext);
                   1318:                        ext = NULL;
1.2       itojun   1319:                }
                   1320:          loopend:
1.62      itojun   1321:                ;
1.2       itojun   1322:        }
1.62      itojun   1323: }
1.85      rpaulo   1324: #undef IS2292
                   1325:
                   1326:
                   1327: void
1.95      dyoung   1328: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1329:     uint32_t *mtu)
1.85      rpaulo   1330: {
                   1331:        struct socket *so;
                   1332:        struct mbuf *m_mtu;
                   1333:        struct ip6_mtuinfo mtuctl;
                   1334:
                   1335:        so = in6p->in6p_socket;
                   1336:
                   1337:        if (mtu == NULL)
                   1338:                return;
                   1339:
                   1340: #ifdef DIAGNOSTIC
                   1341:        if (so == NULL)         /* I believe this is impossible */
                   1342:                panic("ip6_notify_pmtu: socket is NULL");
                   1343: #endif
                   1344:
                   1345:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1346:        mtuctl.ip6m_mtu = *mtu;
                   1347:        mtuctl.ip6m_addr = *dst;
                   1348:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1349:                return;
                   1350:
1.97      christos 1351:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1352:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1353:                return;
                   1354:
1.95      dyoung   1355:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1356:            == 0) {
                   1357:                m_freem(m_mtu);
                   1358:                /* XXX: should count statistics */
                   1359:        } else
                   1360:                sorwakeup(so);
                   1361:
                   1362:        return;
                   1363: }
1.62      itojun   1364:
                   1365: /*
                   1366:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1367:  * contains the result, or NULL on error.
                   1368:  */
                   1369: static struct mbuf *
                   1370: ip6_pullexthdr(m, off, nxt)
                   1371:        struct mbuf *m;
                   1372:        size_t off;
                   1373:        int nxt;
                   1374: {
                   1375:        struct ip6_ext ip6e;
                   1376:        size_t elen;
                   1377:        struct mbuf *n;
                   1378:
                   1379: #ifdef DIAGNOSTIC
                   1380:        switch (nxt) {
                   1381:        case IPPROTO_DSTOPTS:
                   1382:        case IPPROTO_ROUTING:
                   1383:        case IPPROTO_HOPOPTS:
                   1384:        case IPPROTO_AH: /* is it possible? */
                   1385:                break;
                   1386:        default:
                   1387:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1388:        }
1.62      itojun   1389: #endif
1.2       itojun   1390:
1.97      christos 1391:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1392:        if (nxt == IPPROTO_AH)
                   1393:                elen = (ip6e.ip6e_len + 2) << 2;
                   1394:        else
                   1395:                elen = (ip6e.ip6e_len + 1) << 3;
                   1396:
                   1397:        MGET(n, M_DONTWAIT, MT_DATA);
                   1398:        if (n && elen >= MLEN) {
                   1399:                MCLGET(n, M_DONTWAIT);
                   1400:                if ((n->m_flags & M_EXT) == 0) {
                   1401:                        m_free(n);
                   1402:                        n = NULL;
                   1403:                }
                   1404:        }
                   1405:        if (!n)
                   1406:                return NULL;
                   1407:
                   1408:        n->m_len = 0;
                   1409:        if (elen >= M_TRAILINGSPACE(n)) {
                   1410:                m_free(n);
                   1411:                return NULL;
                   1412:        }
                   1413:
1.97      christos 1414:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1415:        n->m_len = elen;
                   1416:        return n;
1.2       itojun   1417: }
                   1418:
                   1419: /*
                   1420:  * Get pointer to the previous header followed by the header
                   1421:  * currently processed.
                   1422:  * XXX: This function supposes that
                   1423:  *     M includes all headers,
                   1424:  *     the next header field and the header length field of each header
                   1425:  *     are valid, and
                   1426:  *     the sum of each header length equals to OFF.
                   1427:  * Because of these assumptions, this function must be called very
                   1428:  * carefully. Moreover, it will not be used in the near future when
                   1429:  * we develop `neater' mechanism to process extension headers.
                   1430:  */
1.58      itojun   1431: u_int8_t *
1.2       itojun   1432: ip6_get_prevhdr(m, off)
                   1433:        struct mbuf *m;
                   1434:        int off;
                   1435: {
                   1436:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1437:
                   1438:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1439:                return (&ip6->ip6_nxt);
1.2       itojun   1440:        else {
                   1441:                int len, nxt;
                   1442:                struct ip6_ext *ip6e = NULL;
                   1443:
                   1444:                nxt = ip6->ip6_nxt;
                   1445:                len = sizeof(struct ip6_hdr);
                   1446:                while (len < off) {
1.97      christos 1447:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1448:
1.35      itojun   1449:                        switch (nxt) {
1.2       itojun   1450:                        case IPPROTO_FRAGMENT:
                   1451:                                len += sizeof(struct ip6_frag);
                   1452:                                break;
                   1453:                        case IPPROTO_AH:
                   1454:                                len += (ip6e->ip6e_len + 2) << 2;
                   1455:                                break;
                   1456:                        default:
                   1457:                                len += (ip6e->ip6e_len + 1) << 3;
                   1458:                                break;
                   1459:                        }
                   1460:                        nxt = ip6e->ip6e_nxt;
                   1461:                }
                   1462:                if (ip6e)
1.58      itojun   1463:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1464:                else
                   1465:                        return NULL;
1.18      itojun   1466:        }
                   1467: }
                   1468:
                   1469: /*
                   1470:  * get next header offset.  m will be retained.
                   1471:  */
                   1472: int
                   1473: ip6_nexthdr(m, off, proto, nxtp)
                   1474:        struct mbuf *m;
                   1475:        int off;
                   1476:        int proto;
                   1477:        int *nxtp;
                   1478: {
                   1479:        struct ip6_hdr ip6;
                   1480:        struct ip6_ext ip6e;
                   1481:        struct ip6_frag fh;
                   1482:
                   1483:        /* just in case */
                   1484:        if (m == NULL)
                   1485:                panic("ip6_nexthdr: m == NULL");
                   1486:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1487:                return -1;
                   1488:
                   1489:        switch (proto) {
                   1490:        case IPPROTO_IPV6:
1.83      rpaulo   1491:                /* do not chase beyond intermediate IPv6 headers */
                   1492:                if (off != 0)
                   1493:                        return -1;
1.18      itojun   1494:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1495:                        return -1;
1.97      christos 1496:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1497:                if (nxtp)
                   1498:                        *nxtp = ip6.ip6_nxt;
                   1499:                off += sizeof(ip6);
                   1500:                return off;
                   1501:
                   1502:        case IPPROTO_FRAGMENT:
                   1503:                /*
                   1504:                 * terminate parsing if it is not the first fragment,
                   1505:                 * it does not make sense to parse through it.
                   1506:                 */
                   1507:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1508:                        return -1;
1.97      christos 1509:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1510:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1511:                        return -1;
                   1512:                if (nxtp)
                   1513:                        *nxtp = fh.ip6f_nxt;
                   1514:                off += sizeof(struct ip6_frag);
                   1515:                return off;
                   1516:
                   1517:        case IPPROTO_AH:
                   1518:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1519:                        return -1;
1.97      christos 1520:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1521:                if (nxtp)
                   1522:                        *nxtp = ip6e.ip6e_nxt;
                   1523:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1524:                if (m->m_pkthdr.len < off)
                   1525:                        return -1;
1.18      itojun   1526:                return off;
                   1527:
                   1528:        case IPPROTO_HOPOPTS:
                   1529:        case IPPROTO_ROUTING:
                   1530:        case IPPROTO_DSTOPTS:
                   1531:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1532:                        return -1;
1.97      christos 1533:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1534:                if (nxtp)
                   1535:                        *nxtp = ip6e.ip6e_nxt;
                   1536:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1537:                if (m->m_pkthdr.len < off)
                   1538:                        return -1;
1.18      itojun   1539:                return off;
                   1540:
                   1541:        case IPPROTO_NONE:
                   1542:        case IPPROTO_ESP:
                   1543:        case IPPROTO_IPCOMP:
                   1544:                /* give up */
                   1545:                return -1;
                   1546:
                   1547:        default:
                   1548:                return -1;
                   1549:        }
                   1550: }
                   1551:
                   1552: /*
                   1553:  * get offset for the last header in the chain.  m will be kept untainted.
                   1554:  */
                   1555: int
                   1556: ip6_lasthdr(m, off, proto, nxtp)
                   1557:        struct mbuf *m;
                   1558:        int off;
                   1559:        int proto;
                   1560:        int *nxtp;
                   1561: {
                   1562:        int newoff;
                   1563:        int nxt;
                   1564:
                   1565:        if (!nxtp) {
                   1566:                nxt = -1;
                   1567:                nxtp = &nxt;
                   1568:        }
1.86      rpaulo   1569:        for (;;) {
1.18      itojun   1570:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1571:                if (newoff < 0)
                   1572:                        return off;
                   1573:                else if (newoff < off)
                   1574:                        return -1;      /* invalid */
                   1575:                else if (newoff == off)
                   1576:                        return newoff;
                   1577:
                   1578:                off = newoff;
                   1579:                proto = *nxtp;
1.2       itojun   1580:        }
                   1581: }
                   1582:
1.81      rpaulo   1583: struct m_tag *
                   1584: ip6_addaux(m)
                   1585:        struct mbuf *m;
                   1586: {
                   1587:        struct m_tag *mtag;
                   1588:
                   1589:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1590:        if (!mtag) {
                   1591:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1592:                    M_NOWAIT);
                   1593:                if (mtag) {
                   1594:                        m_tag_prepend(m, mtag);
                   1595:                        bzero(mtag + 1, sizeof(struct ip6aux));
                   1596:                }
                   1597:        }
                   1598:        return mtag;
                   1599: }
                   1600:
                   1601: struct m_tag *
                   1602: ip6_findaux(m)
                   1603:        struct mbuf *m;
                   1604: {
                   1605:        struct m_tag *mtag;
                   1606:
                   1607:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1608:        return mtag;
                   1609: }
                   1610:
                   1611: void
                   1612: ip6_delaux(m)
                   1613:        struct mbuf *m;
                   1614: {
                   1615:        struct m_tag *mtag;
                   1616:
                   1617:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1618:        if (mtag)
                   1619:                m_tag_delete(m, mtag);
                   1620: }
                   1621:
1.98      liamjfoy 1622: #ifdef GATEWAY
                   1623: /*
                   1624:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1625:  * we could reduce this value, call ip6flow_reap();
                   1626:  */
                   1627: static int
1.101     liamjfoy 1628: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98      liamjfoy 1629: {
                   1630:         int s;
                   1631:
                   1632:         s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.100     liamjfoy 1633:         if (s || newp == NULL)
1.98      liamjfoy 1634:                 return (s);
                   1635:
                   1636:         s = splsoftnet();
                   1637:         ip6flow_reap(0);
                   1638:         splx(s);
                   1639:
                   1640:         return (0);
                   1641: }
1.99      liamjfoy 1642:
                   1643: static int
                   1644: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1645: {
                   1646:        int error, tmp;
                   1647:        struct sysctlnode node;
                   1648:
                   1649:        node = *rnode;
                   1650:        tmp = ip6_hashsize;
                   1651:        node.sysctl_data = &tmp;
                   1652:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1653:        if (error || newp == NULL)
                   1654:                return (error);
                   1655:
                   1656:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1657:                /*
                   1658:                 * Can only fail due to malloc()
                   1659:                 */
                   1660:                if (ip6flow_invalidate_all(tmp))
                   1661:                        return ENOMEM;
                   1662:        } else {
                   1663:                /*
                   1664:                 * EINVAL if not a power of 2
                   1665:                 */
                   1666:                return EINVAL;
                   1667:        }
                   1668:
                   1669:        return (0);
                   1670: }
1.98      liamjfoy 1671: #endif /* GATEWAY */
                   1672:
1.102     christos 1673: static int
                   1674: sysctl_net_inet6_ip6_rht0(SYSCTLFN_ARGS)
                   1675: {
                   1676:        int error, tmp;
                   1677:        struct sysctlnode node;
                   1678:
                   1679:        node = *rnode;
                   1680:        tmp = ip6_rht0;
                   1681:        node.sysctl_data = &tmp;
                   1682:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1683:        if (error || newp == NULL)
                   1684:                return error;
                   1685:
                   1686:        switch (tmp) {
                   1687:        case -1:        /* disable processing */
                   1688:        case 0:         /* disable for host, enable for router */
                   1689:        case 1:         /* enable for all */
                   1690:                break;
                   1691:        default:
                   1692:                return EINVAL;
                   1693:        }
                   1694:        ip6_rht0 = tmp;
                   1695:        return 0;
                   1696: }
                   1697:
1.2       itojun   1698: /*
                   1699:  * System control for IP6
                   1700:  */
                   1701:
                   1702: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1703:        0,              0,              0,              0,
                   1704:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1705:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1706:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1707:        0,              0,              0,              0,
                   1708:        ENOPROTOOPT
                   1709: };
                   1710:
1.70      atatat   1711: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2       itojun   1712: {
1.85      rpaulo   1713: #ifdef RFC2292
                   1714: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1715: #else
                   1716: #define IS2292(x, y)   (y)
                   1717: #endif
1.26      itojun   1718:
1.73      atatat   1719:        sysctl_createv(clog, 0, NULL, NULL,
                   1720:                       CTLFLAG_PERMANENT,
1.70      atatat   1721:                       CTLTYPE_NODE, "net", NULL,
                   1722:                       NULL, 0, NULL, 0,
                   1723:                       CTL_NET, CTL_EOL);
1.73      atatat   1724:        sysctl_createv(clog, 0, NULL, NULL,
                   1725:                       CTLFLAG_PERMANENT,
1.74      atatat   1726:                       CTLTYPE_NODE, "inet6",
                   1727:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1728:                       NULL, 0, NULL, 0,
                   1729:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1730:        sysctl_createv(clog, 0, NULL, NULL,
                   1731:                       CTLFLAG_PERMANENT,
1.74      atatat   1732:                       CTLTYPE_NODE, "ip6",
                   1733:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1734:                       NULL, 0, NULL, 0,
                   1735:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1736:
1.73      atatat   1737:        sysctl_createv(clog, 0, NULL, NULL,
                   1738:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1739:                       CTLTYPE_INT, "forwarding",
                   1740:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1741:                       NULL, 0, &ip6_forwarding, 0,
                   1742:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1743:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1744:        sysctl_createv(clog, 0, NULL, NULL,
                   1745:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1746:                       CTLTYPE_INT, "redirect",
                   1747:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1748:                       NULL, 0, &ip6_sendredirects, 0,
                   1749:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1750:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1751:        sysctl_createv(clog, 0, NULL, NULL,
                   1752:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1753:                       CTLTYPE_INT, "hlim",
                   1754:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1755:                       NULL, 0, &ip6_defhlim, 0,
                   1756:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1757:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1758: #ifdef notyet
1.73      atatat   1759:        sysctl_createv(clog, 0, NULL, NULL,
                   1760:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1761:                       CTLTYPE_INT, "mtu", NULL,
                   1762:                       NULL, 0, &, 0,
                   1763:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1764:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1765: #endif
                   1766: #ifdef __no_idea__
1.73      atatat   1767:        sysctl_createv(clog, 0, NULL, NULL,
                   1768:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1769:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1770:                       NULL, 0, &?, 0,
                   1771:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1772:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1773:        sysctl_createv(clog, 0, NULL, NULL,
                   1774:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1775:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1776:                       NULL, 0, &?, sizeof(?),
                   1777:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1778:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1779:        sysctl_createv(clog, 0, NULL, NULL,
                   1780:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1781:                       CTLTYPE_?, "mrtproto", NULL,
                   1782:                       NULL, 0, &?, sizeof(?),
                   1783:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1784:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1785: #endif
1.73      atatat   1786:        sysctl_createv(clog, 0, NULL, NULL,
                   1787:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1788:                       CTLTYPE_INT, "maxfragpackets",
                   1789:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1790:                                    "for reassembly"),
1.70      atatat   1791:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1792:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1793:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1794: #ifdef __no_idea__
1.73      atatat   1795:        sysctl_createv(clog, 0, NULL, NULL,
                   1796:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1797:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1798:                       NULL, 0, &?, 0,
                   1799:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1800:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1801:        sysctl_createv(clog, 0, NULL, NULL,
                   1802:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1803:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1804:                       NULL, 0, &?, 0,
                   1805:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1806:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1807: #endif
1.73      atatat   1808:        sysctl_createv(clog, 0, NULL, NULL,
                   1809:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1810:                       CTLTYPE_INT, "accept_rtadv",
                   1811:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1812:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1813:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1814:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1815:        sysctl_createv(clog, 0, NULL, NULL,
                   1816:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1817:                       CTLTYPE_INT, "keepfaith",
                   1818:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1819:                       NULL, 0, &ip6_keepfaith, 0,
                   1820:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1821:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1822:        sysctl_createv(clog, 0, NULL, NULL,
                   1823:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1824:                       CTLTYPE_INT, "log_interval",
                   1825:                       SYSCTL_DESCR("Minumum interval between logging "
                   1826:                                    "unroutable packets"),
1.70      atatat   1827:                       NULL, 0, &ip6_log_interval, 0,
                   1828:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1829:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1830:        sysctl_createv(clog, 0, NULL, NULL,
                   1831:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1832:                       CTLTYPE_INT, "hdrnestlimit",
                   1833:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1834:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1835:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1836:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1837:        sysctl_createv(clog, 0, NULL, NULL,
                   1838:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1839:                       CTLTYPE_INT, "dad_count",
                   1840:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1841:                                    "probes to send"),
1.70      atatat   1842:                       NULL, 0, &ip6_dad_count, 0,
                   1843:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1844:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1845:        sysctl_createv(clog, 0, NULL, NULL,
                   1846:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1847:                       CTLTYPE_INT, "auto_flowlabel",
                   1848:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1849:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1850:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1851:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1852:        sysctl_createv(clog, 0, NULL, NULL,
                   1853:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1854:                       CTLTYPE_INT, "defmcasthlim",
                   1855:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1856:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1857:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1858:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1859: #if NGIF > 0
1.73      atatat   1860:        sysctl_createv(clog, 0, NULL, NULL,
                   1861:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1862:                       CTLTYPE_INT, "gifhlim",
                   1863:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1864:                       NULL, 0, &ip6_gif_hlim, 0,
                   1865:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1866:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1867: #endif /* NGIF */
1.73      atatat   1868:        sysctl_createv(clog, 0, NULL, NULL,
                   1869:                       CTLFLAG_PERMANENT,
1.74      atatat   1870:                       CTLTYPE_STRING, "kame_version",
                   1871:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1872:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1873:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1874:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1875:        sysctl_createv(clog, 0, NULL, NULL,
                   1876:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1877:                       CTLTYPE_INT, "use_deprecated",
                   1878:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1879:                                    "source addresses"),
1.70      atatat   1880:                       NULL, 0, &ip6_use_deprecated, 0,
                   1881:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1882:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1883:        sysctl_createv(clog, 0, NULL, NULL,
                   1884:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1885:                       CTLTYPE_INT, "rr_prune", NULL,
                   1886:                       NULL, 0, &ip6_rr_prune, 0,
                   1887:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1888:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1889:        sysctl_createv(clog, 0, NULL, NULL,
                   1890:                       CTLFLAG_PERMANENT
1.70      atatat   1891: #ifndef INET6_BINDV6ONLY
1.73      atatat   1892:                       |CTLFLAG_READWRITE,
1.70      atatat   1893: #endif
1.74      atatat   1894:                       CTLTYPE_INT, "v6only",
                   1895:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1896:                                    "to PF_INET sockets"),
1.70      atatat   1897:                       NULL, 0, &ip6_v6only, 0,
                   1898:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1899:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1900:        sysctl_createv(clog, 0, NULL, NULL,
                   1901:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1902:                       CTLTYPE_INT, "anonportmin",
                   1903:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1904:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1905:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1906:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1907:        sysctl_createv(clog, 0, NULL, NULL,
                   1908:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1909:                       CTLTYPE_INT, "anonportmax",
                   1910:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1911:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1912:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1913:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1914: #ifndef IPNOPRIVPORTS
1.73      atatat   1915:        sysctl_createv(clog, 0, NULL, NULL,
                   1916:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1917:                       CTLTYPE_INT, "lowportmin",
                   1918:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1919:                                    "to assign"),
1.70      atatat   1920:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1921:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1922:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1923:        sysctl_createv(clog, 0, NULL, NULL,
                   1924:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1925:                       CTLTYPE_INT, "lowportmax",
                   1926:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1927:                                    "to assign"),
1.70      atatat   1928:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1929:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1930:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1931: #endif /* IPNOPRIVPORTS */
1.73      atatat   1932:        sysctl_createv(clog, 0, NULL, NULL,
                   1933:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1934:                       CTLTYPE_INT, "use_tempaddr",
                   1935:                       SYSCTL_DESCR("Use temporary address"),
                   1936:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1937:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1938:                       CTL_CREATE, CTL_EOL);
                   1939:        sysctl_createv(clog, 0, NULL, NULL,
                   1940:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1941:                       CTLTYPE_INT, "temppltime",
                   1942:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1943:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1944:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1945:                       CTL_CREATE, CTL_EOL);
                   1946:        sysctl_createv(clog, 0, NULL, NULL,
                   1947:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1948:                       CTLTYPE_INT, "tempvltime",
                   1949:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1950:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1951:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1952:                       CTL_CREATE, CTL_EOL);
                   1953:        sysctl_createv(clog, 0, NULL, NULL,
                   1954:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1955:                       CTLTYPE_INT, "maxfrags",
                   1956:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1957:                       NULL, 0, &ip6_maxfrags, 0,
                   1958:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1959:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1960:        sysctl_createv(clog, 0, NULL, NULL,
                   1961:                       CTLFLAG_PERMANENT,
                   1962:                       CTLTYPE_STRUCT, "stats",
                   1963:                       SYSCTL_DESCR("IPv6 statistics"),
                   1964:                       NULL, 0, &ip6stat, sizeof(ip6stat),
                   1965:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1966:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1967:        sysctl_createv(clog, 0, NULL, NULL,
                   1968:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1969:                       CTLTYPE_INT, "use_defaultzone",
                   1970:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1971:                       NULL, 0, &ip6_use_defzone, 0,
                   1972:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1973:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1974:        sysctl_createv(clog, 0, NULL, NULL,
                   1975:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1976:                       CTLTYPE_INT, "mcast_pmtu",
                   1977:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1978:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1979:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1980:                       CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1981: #ifdef GATEWAY
                   1982:        sysctl_createv(clog, 0, NULL, NULL,
                   1983:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1984:                        CTLTYPE_INT, "maxflows",
                   1985:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1986:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1987:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1988:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1989:        sysctl_createv(clog, 0, NULL, NULL,
                   1990:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1991:                        CTLTYPE_INT, "hashsize",
                   1992:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1993:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1994:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1995:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1996: #endif
1.102     christos 1997:        sysctl_createv(clog, 0, NULL, NULL,
                   1998:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1999:                        CTLTYPE_INT, "rht0",
                   2000:                        SYSCTL_DESCR("Processing of routing header type 0 (IPv6)"),
                   2001:                        sysctl_net_inet6_ip6_rht0, 0, &ip6_rht0, 0,
                   2002:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   2003:                        CTL_CREATE, CTL_EOL);
1.2       itojun   2004: }

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