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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.94.2.4

1.94.2.4! yamt        1: /*     $NetBSD: ip6_input.c,v 1.94.2.3 2007/03/24 14:56:12 yamt Exp $  */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
1.65      agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.94.2.4! yamt       65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.94.2.3 2007/03/24 14:56:12 yamt Exp $");
1.2       itojun     66:
                     67: #include "opt_inet.h"
1.85      rpaulo     68: #include "opt_inet6.h"
1.4       thorpej    69: #include "opt_ipsec.h"
1.15      darrenr    70: #include "opt_pfil_hooks.h"
1.2       itojun     71:
                     72: #include <sys/param.h>
                     73: #include <sys/systm.h>
                     74: #include <sys/malloc.h>
                     75: #include <sys/mbuf.h>
                     76: #include <sys/domain.h>
                     77: #include <sys/protosw.h>
                     78: #include <sys/socket.h>
                     79: #include <sys/socketvar.h>
                     80: #include <sys/errno.h>
                     81: #include <sys/time.h>
                     82: #include <sys/kernel.h>
                     83: #include <sys/syslog.h>
                     84: #include <sys/proc.h>
1.46      simonb     85: #include <sys/sysctl.h>
1.2       itojun     86:
                     87: #include <net/if.h>
                     88: #include <net/if_types.h>
                     89: #include <net/if_dl.h>
                     90: #include <net/route.h>
                     91: #include <net/netisr.h>
1.15      darrenr    92: #ifdef PFIL_HOOKS
                     93: #include <net/pfil.h>
                     94: #endif
1.2       itojun     95:
                     96: #include <netinet/in.h>
1.9       itojun     97: #include <netinet/in_systm.h>
                     98: #ifdef INET
                     99: #include <netinet/ip.h>
                    100: #include <netinet/ip_icmp.h>
1.45      itojun    101: #endif /* INET */
1.14      itojun    102: #include <netinet/ip6.h>
1.2       itojun    103: #include <netinet6/in6_var.h>
1.11      itojun    104: #include <netinet6/ip6_var.h>
1.2       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);
1.94.2.2  rmind     185: #ifdef GATEWAY
1.94.2.3  yamt      186:        ip6flow_init(ip6_hashsize);
1.94.2.2  rmind     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:
1.94.2.4! yamt      240: extern struct  route ip6_forward_rt;
1.2       itojun    241:
                    242: void
1.94.2.1  yamt      243: ip6_input(struct mbuf *m)
1.2       itojun    244: {
1.9       itojun    245:        struct ip6_hdr *ip6;
1.94.2.4! yamt      246:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    247:        u_int32_t plen;
1.5       itojun    248:        u_int32_t rtalert = ~0;
1.94.2.4! yamt      249:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    250:        struct ifnet *deliverifp = NULL;
1.64      itojun    251:        int srcrt = 0;
1.94.2.4! yamt      252:        const struct rtentry *rt;
        !           253:        union {
        !           254:                struct sockaddr         dst;
        !           255:                struct sockaddr_in6     dst6;
        !           256:        } u;
1.94      degroote  257: #ifdef FAST_IPSEC
                    258:        struct m_tag *mtag;
                    259:        struct tdb_ident *tdbi;
                    260:        struct secpolicy *sp;
                    261:        int s, error;
                    262: #endif
1.2       itojun    263:
                    264: #ifdef IPSEC
                    265:        /*
                    266:         * should the inner packet be considered authentic?
                    267:         * see comment in ah4_input().
                    268:         */
1.49      itojun    269:        m->m_flags &= ~M_AUTHIPHDR;
                    270:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    271: #endif
1.9       itojun    272:
1.2       itojun    273:        /*
1.81      rpaulo    274:         * make sure we don't have onion peering information into m_tag.
                    275:         */
                    276:        ip6_delaux(m);
                    277:
                    278:        /*
1.44      itojun    279:         * mbuf statistics
1.2       itojun    280:         */
                    281:        if (m->m_flags & M_EXT) {
                    282:                if (m->m_next)
                    283:                        ip6stat.ip6s_mext2m++;
                    284:                else
                    285:                        ip6stat.ip6s_mext1++;
                    286:        } else {
1.94.2.1  yamt      287: #define M2MMAX __arraycount(ip6stat.ip6s_m2m)
1.2       itojun    288:                if (m->m_next) {
1.9       itojun    289:                        if (m->m_flags & M_LOOP) {
1.77      peter     290:                                ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */
1.40      itojun    291:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
1.2       itojun    292:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    293:                        else
                    294:                                ip6stat.ip6s_m2m[0]++;
                    295:                } else
                    296:                        ip6stat.ip6s_m1++;
1.40      itojun    297: #undef M2MMAX
1.2       itojun    298:        }
                    299:
1.9       itojun    300:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    301:        ip6stat.ip6s_total++;
                    302:
1.57      thorpej   303:        /*
                    304:         * If the IPv6 header is not aligned, slurp it up into a new
                    305:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    306:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   307:         * IPv6 header is in the first mbuf of the chain.
                    308:         */
1.94.2.2  rmind     309:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   310:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    311:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    312:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    313:                        /* XXXJRT new stat, please */
                    314:                        ip6stat.ip6s_toosmall++;
                    315:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    316:                        return;
                    317:                }
                    318:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    319:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    320:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.9       itojun    321:                        ip6stat.ip6s_toosmall++;
                    322:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    323:                        return;
                    324:                }
1.2       itojun    325:        }
                    326:
                    327:        ip6 = mtod(m, struct ip6_hdr *);
                    328:
                    329:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    330:                ip6stat.ip6s_badvers++;
1.9       itojun    331:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    332:                goto bad;
                    333:        }
1.15      darrenr   334:
1.94.2.2  rmind     335: #if defined(IPSEC)
                    336:        /* IPv6 fast forwarding is not compatible with IPsec. */
                    337:        m->m_flags &= ~M_CANFASTFWD;
                    338: #else
                    339:        /*
                    340:         * Assume that we can create a fast-forward IP flow entry
                    341:         * based on this packet.
                    342:         */
                    343:        m->m_flags |= M_CANFASTFWD;
                    344: #endif
                    345:
1.15      darrenr   346: #ifdef PFIL_HOOKS
                    347:        /*
                    348:         * Run through list of hooks for input packets.  If there are any
                    349:         * filters which require that additional packets in the flow are
                    350:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    351:         * Note that filters must _never_ set this flag, as another filter
                    352:         * in the list may have previously cleared it.
                    353:         */
1.39      itojun    354:        /*
                    355:         * let ipfilter look at packet on the wire,
                    356:         * not the decapsulated packet.
                    357:         */
                    358: #ifdef IPSEC
1.42      itojun    359:        if (!ipsec_getnhist(m))
1.94      degroote  360: #elif defined(FAST_IPSEC)
                    361:        if (!ipsec_indone(m))
1.39      itojun    362: #else
                    363:        if (1)
                    364: #endif
                    365:        {
1.64      itojun    366:                struct in6_addr odst;
                    367:
                    368:                odst = ip6->ip6_dst;
1.39      itojun    369:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    370:                                   PFIL_IN) != 0)
                    371:                        return;
                    372:                if (m == NULL)
                    373:                        return;
                    374:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    375:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    376:        }
1.15      darrenr   377: #endif /* PFIL_HOOKS */
                    378:
1.2       itojun    379:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    380:
1.30      thorpej   381: #ifdef ALTQ
                    382:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    383:                /* packet is dropped by traffic conditioner */
                    384:                return;
1.9       itojun    385:        }
                    386: #endif
                    387:
1.2       itojun    388:        /*
1.44      itojun    389:         * Check against address spoofing/corruption.
1.2       itojun    390:         */
                    391:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    392:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    393:                /*
                    394:                 * XXX: "badscope" is not very suitable for a multicast source.
                    395:                 */
1.2       itojun    396:                ip6stat.ip6s_badscope++;
1.9       itojun    397:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    398:                goto bad;
                    399:        }
1.13      itojun    400:        /*
1.44      itojun    401:         * The following check is not documented in specs.  A malicious
                    402:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    403:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    404:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    405:         *
1.44      itojun    406:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    407:         * support IPv4-less kernel compilation, we cannot support SIIT
                    408:         * environment at all.  So, it makes more sense for us to reject any
                    409:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       410:         * partial support for SIIT environment.
1.13      itojun    411:         */
                    412:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    413:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    414:                ip6stat.ip6s_badscope++;
                    415:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    416:                goto bad;
                    417:        }
1.17      itojun    418: #if 0
1.13      itojun    419:        /*
1.17      itojun    420:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    421:         *
                    422:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    423:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    424:         * is revised to forbid relaying case.
1.13      itojun    425:         */
                    426:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    427:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    428:                ip6stat.ip6s_badscope++;
                    429:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    430:                goto bad;
                    431:        }
                    432: #endif
1.35      itojun    433:
1.2       itojun    434:        /*
1.82      yamt      435:         * Disambiguate address scope zones (if there is ambiguity).
                    436:         * We first make sure that the original source or destination address
                    437:         * is not in our internal form for scoped addresses.  Such addresses
                    438:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    439:         * to the usage conflict.
                    440:         * in6_setscope() then also checks and rejects the cases where src or
                    441:         * dst are the loopback address and the receiving interface
                    442:         * is not loopback.
                    443:         */
1.88      bouyer    444:        if (__predict_false(
                    445:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    446:                goto bad;
                    447:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      448:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
                    449:                ip6stat.ip6s_badscope++; /* XXX */
                    450:                goto bad;
                    451:        }
                    452:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    453:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
                    454:                ip6stat.ip6s_badscope++;
                    455:                goto bad;
                    456:        }
                    457:
                    458:        /*
1.2       itojun    459:         * Multicast check
                    460:         */
                    461:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    462:                struct  in6_multi *in6m = 0;
1.9       itojun    463:
                    464:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    465:                /*
                    466:                 * See if we belong to the destination multicast group on the
                    467:                 * arrival interface.
                    468:                 */
                    469:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    470:                if (in6m)
                    471:                        ours = 1;
                    472:                else if (!ip6_mrouter) {
                    473:                        ip6stat.ip6s_notmember++;
                    474:                        ip6stat.ip6s_cantforward++;
1.9       itojun    475:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    476:                        goto bad;
                    477:                }
1.9       itojun    478:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    479:                goto hbhcheck;
                    480:        }
                    481:
1.94.2.4! yamt      482:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
        !           483:
1.2       itojun    484:        /*
                    485:         *  Unicast check
                    486:         */
1.94.2.4! yamt      487:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
        !           488:        if (hit)
1.25      itojun    489:                ip6stat.ip6s_forward_cachehit++;
1.94.2.4! yamt      490:        else
1.93      joerg     491:                ip6stat.ip6s_forward_cachemiss++;
1.22      itojun    492:
1.2       itojun    493: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    494:
                    495:        /*
                    496:         * Accept the packet if the forwarding interface to the destination
                    497:         * according to the routing table is the loopback interface,
                    498:         * unless the associated route has a gateway.
                    499:         * Note that this approach causes to accept a packet if there is a
                    500:         * route to the loopback interface for the destination of the packet.
                    501:         * But we think it's even useful in some situations, e.g. when using
                    502:         * a special daemon which wants to intercept the packet.
                    503:         */
1.94.2.4! yamt      504:        if (rt != NULL &&
        !           505:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
        !           506:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    507: #if 0
                    508:            /*
                    509:             * The check below is redundant since the comparison of
                    510:             * the destination and the key of the rtentry has
                    511:             * already done through looking up the routing table.
                    512:             */
1.94.2.4! yamt      513:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_key(rt)->sin6_addr) &&
1.2       itojun    514: #endif
1.94.2.4! yamt      515:            rt->rt_ifp->if_type == IFT_LOOP) {
        !           516:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    517:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    518:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    519:                /*
                    520:                 * packets to a tentative, duplicated, or somehow invalid
                    521:                 * address must not be accepted.
                    522:                 */
1.2       itojun    523:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    524:                        /* this address is ready */
1.2       itojun    525:                        ours = 1;
1.9       itojun    526:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    527:                        goto hbhcheck;
                    528:                } else {
1.24      itojun    529:                        /* address is not ready, so discard the packet. */
1.34      itojun    530:                        nd6log((LOG_INFO,
1.27      itojun    531:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    532:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    533:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    534:
                    535:                        goto bad;
1.2       itojun    536:                }
                    537:        }
                    538:
                    539:        /*
1.55      itojun    540:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    541:         */
                    542: #if defined(NFAITH) && 0 < NFAITH
                    543:        if (ip6_keepfaith) {
1.94.2.4! yamt      544:                if (rt != NULL && rt->rt_ifp != NULL &&
        !           545:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    546:                        /* XXX do we need more sanity checks? */
                    547:                        ours = 1;
1.94.2.4! yamt      548:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    549:                        goto hbhcheck;
                    550:                }
                    551:        }
                    552: #endif
                    553:
                    554: #if 0
                    555:     {
                    556:        /*
                    557:         * Last resort: check in6_ifaddr for incoming interface.
                    558:         * The code is here until I update the "goto ours hack" code above
                    559:         * working right.
                    560:         */
                    561:        struct ifaddr *ifa;
1.91      dyoung    562:        TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) {
1.9       itojun    563:                if (ifa->ifa_addr == NULL)
                    564:                        continue;       /* just for safety */
                    565:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    566:                        continue;
                    567:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    568:                        ours = 1;
                    569:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    570:                        goto hbhcheck;
                    571:                }
                    572:        }
1.9       itojun    573:     }
1.2       itojun    574: #endif
                    575:
                    576:        /*
                    577:         * Now there is no reason to process the packet if it's not our own
                    578:         * and we're not a router.
                    579:         */
                    580:        if (!ip6_forwarding) {
                    581:                ip6stat.ip6s_cantforward++;
1.9       itojun    582:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    583:                goto bad;
                    584:        }
                    585:
                    586:   hbhcheck:
                    587:        /*
1.81      rpaulo    588:         * record address information into m_tag, if we don't have one yet.
                    589:         * note that we are unable to record it, if the address is not listed
                    590:         * as our interface address (e.g. multicast addresses, addresses
                    591:         * within FAITH prefixes and such).
                    592:         */
                    593:        if (deliverifp && !ip6_getdstifaddr(m)) {
                    594:                struct in6_ifaddr *ia6;
                    595:
                    596:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    597:                if (ia6) {
                    598:                        if (!ip6_setdstifaddr(m, ia6)) {
                    599:                                /*
                    600:                                 * XXX maybe we should drop the packet here,
                    601:                                 * as we could not provide enough information
                    602:                                 * to the upper layers.
                    603:                                 */
                    604:                        }
                    605:                }
                    606:        }
                    607:
                    608:        /*
1.2       itojun    609:         * Process Hop-by-Hop options header if it's contained.
                    610:         * m may be modified in ip6_hopopts_input().
                    611:         * If a JumboPayload option is included, plen will also be modified.
                    612:         */
                    613:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    614:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    615:                struct ip6_hbh *hbh;
                    616:
                    617:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    618: #if 0  /*touches NULL pointer*/
                    619:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    620: #endif
1.2       itojun    621:                        return; /* m have already been freed */
1.9       itojun    622:                }
1.22      itojun    623:
1.2       itojun    624:                /* adjust pointer */
                    625:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    626:
                    627:                /*
1.49      itojun    628:                 * if the payload length field is 0 and the next header field
1.22      itojun    629:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    630:                 * option MUST be included.
                    631:                 */
                    632:                if (ip6->ip6_plen == 0 && plen == 0) {
                    633:                        /*
                    634:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    635:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    636:                         * (non-zero) payload length to the variable plen.
1.22      itojun    637:                         */
                    638:                        ip6stat.ip6s_badoptions++;
                    639:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    640:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    641:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    642:                                    ICMP6_PARAMPROB_HEADER,
1.94.2.2  rmind     643:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    644:                        return;
                    645:                }
1.9       itojun    646:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    647:                        sizeof(struct ip6_hbh));
                    648:                if (hbh == NULL) {
                    649:                        ip6stat.ip6s_tooshort++;
                    650:                        return;
                    651:                }
1.57      thorpej   652:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    653:                nxt = hbh->ip6h_nxt;
1.2       itojun    654:
                    655:                /*
                    656:                 * accept the packet if a router alert option is included
                    657:                 * and we act as an IPv6 router.
                    658:                 */
1.5       itojun    659:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    660:                        ours = 1;
                    661:        } else
                    662:                nxt = ip6->ip6_nxt;
                    663:
                    664:        /*
                    665:         * Check that the amount of data in the buffers
                    666:         * is as at least much as the IPv6 header would have us expect.
                    667:         * Trim mbufs if longer than we expect.
                    668:         * Drop packet if shorter than we expect.
                    669:         */
                    670:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    671:                ip6stat.ip6s_tooshort++;
1.9       itojun    672:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    673:                goto bad;
                    674:        }
                    675:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    676:                if (m->m_len == m->m_pkthdr.len) {
                    677:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    678:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    679:                } else
                    680:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    681:        }
                    682:
                    683:        /*
                    684:         * Forward if desirable.
                    685:         */
                    686:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    687:                /*
                    688:                 * If we are acting as a multicast router, all
                    689:                 * incoming multicast packets are passed to the
                    690:                 * kernel-level multicast forwarding function.
                    691:                 * The packet is returned (relatively) intact; if
                    692:                 * ip6_mforward() returns a non-zero value, the packet
                    693:                 * must be discarded, else it may be accepted below.
                    694:                 */
                    695:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    696:                        ip6stat.ip6s_cantforward++;
                    697:                        m_freem(m);
                    698:                        return;
                    699:                }
                    700:                if (!ours) {
                    701:                        m_freem(m);
                    702:                        return;
                    703:                }
1.22      itojun    704:        } else if (!ours) {
1.64      itojun    705:                ip6_forward(m, srcrt);
1.2       itojun    706:                return;
1.56      itojun    707:        }
1.25      itojun    708:
                    709:        ip6 = mtod(m, struct ip6_hdr *);
                    710:
                    711:        /*
                    712:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    713:         * tcp/udp stack and bypass security checks (act as if it was from
                    714:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    715:         *
                    716:         * For SIIT end node behavior, you may want to disable the check.
                    717:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    718:         * source.
                    719:         */
                    720:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    721:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    722:                ip6stat.ip6s_badscope++;
                    723:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    724:                goto bad;
                    725:        }
1.2       itojun    726:
                    727:        /*
                    728:         * Tell launch routine the next header
                    729:         */
1.12      itojun    730: #ifdef IFA_STATS
1.28      itojun    731:        if (deliverifp != NULL) {
1.9       itojun    732:                struct in6_ifaddr *ia6;
                    733:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    734:                if (ia6)
                    735:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    736:        }
                    737: #endif
1.2       itojun    738:        ip6stat.ip6s_delivered++;
1.9       itojun    739:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    740:        nest = 0;
1.40      itojun    741:
1.94.2.4! yamt      742:        rh_present = 0;
1.2       itojun    743:        while (nxt != IPPROTO_DONE) {
                    744:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    745:                        ip6stat.ip6s_toomanyhdr++;
1.94.2.4! yamt      746:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    747:                        goto bad;
                    748:                }
1.8       itojun    749:
                    750:                /*
                    751:                 * protection against faulty packet - there should be
                    752:                 * more sanity checks in header chain processing.
                    753:                 */
                    754:                if (m->m_pkthdr.len < off) {
                    755:                        ip6stat.ip6s_tooshort++;
1.9       itojun    756:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    757:                        goto bad;
                    758:                }
                    759:
1.94.2.4! yamt      760:                if (nxt == IPPROTO_ROUTING) {
        !           761:                        if (rh_present++) {
        !           762:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
        !           763:                                    ifs6_in_hdrerr);
        !           764:                                ip6stat.ip6s_badoptions++;
        !           765:                                goto bad;
        !           766:                        }
        !           767:                }
        !           768:
1.37      itojun    769: #ifdef IPSEC
                    770:                /*
                    771:                 * enforce IPsec policy checking if we are seeing last header.
                    772:                 * note that we do not visit this with protocols with pcb layer
                    773:                 * code - like udp/tcp/raw ip.
                    774:                 */
                    775:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    776:                    ipsec6_in_reject(m, NULL)) {
                    777:                        ipsec6stat.in_polvio++;
                    778:                        goto bad;
                    779:                }
                    780: #endif
1.94      degroote  781: #ifdef FAST_IPSEC
                    782:        /*
                    783:         * enforce IPsec policy checking if we are seeing last header.
                    784:         * note that we do not visit this with protocols with pcb layer
                    785:         * code - like udp/tcp/raw ip.
                    786:         */
                    787:        if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
                    788:                /*
                    789:                 * Check if the packet has already had IPsec processing
                    790:                 * done.  If so, then just pass it along.  This tag gets
                    791:                 * set during AH, ESP, etc. input handling, before the
                    792:                 * packet is returned to the ip input queue for delivery.
                    793:                 */
                    794:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    795:                s = splsoftnet();
                    796:                if (mtag != NULL) {
                    797:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    798:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    799:                } else {
                    800:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    801:                                                                        IP_FORWARDING, &error);
                    802:                }
                    803:                if (sp != NULL) {
                    804:                        /*
                    805:                         * Check security policy against packet attributes.
                    806:                         */
                    807:                        error = ipsec_in_reject(sp, m);
                    808:                        KEY_FREESP(&sp);
                    809:                } else {
                    810:                        /* XXX error stat??? */
                    811:                        error = EINVAL;
                    812:                        DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
                    813:                        goto bad;
                    814:                }
                    815:                splx(s);
                    816:                if (error)
                    817:                        goto bad;
                    818:        }
                    819: #endif /* FAST_IPSEC */
                    820:
1.56      itojun    821:
1.2       itojun    822:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    823:        }
                    824:        return;
                    825:  bad:
                    826:        m_freem(m);
                    827: }
                    828:
                    829: /*
1.81      rpaulo    830:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    831:  */
                    832: static struct m_tag *
                    833: ip6_setdstifaddr(m, ia6)
                    834:        struct mbuf *m;
                    835:        struct in6_ifaddr *ia6;
                    836: {
                    837:        struct m_tag *mtag;
                    838:
                    839:        mtag = ip6_addaux(m);
                    840:        if (mtag)
                    841:                ((struct ip6aux *)(mtag + 1))->ip6a_dstia6 = ia6;
                    842:        return mtag;    /* NULL if failed to set */
                    843: }
                    844:
                    845: struct in6_ifaddr *
                    846: ip6_getdstifaddr(m)
                    847:        struct mbuf *m;
                    848: {
                    849:        struct m_tag *mtag;
                    850:
                    851:        mtag = ip6_findaux(m);
                    852:        if (mtag)
                    853:                return ((struct ip6aux *)(mtag + 1))->ip6a_dstia6;
                    854:        else
                    855:                return NULL;
                    856: }
                    857:
                    858: /*
1.2       itojun    859:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    860:  * included, the real payload length will be stored in plenp.
                    861:  */
                    862: static int
                    863: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    864:        u_int32_t *plenp;
1.5       itojun    865:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    866:        struct mbuf **mp;
                    867:        int *offp;
                    868: {
1.35      itojun    869:        struct mbuf *m = *mp;
1.2       itojun    870:        int off = *offp, hbhlen;
                    871:        struct ip6_hbh *hbh;
                    872:
                    873:        /* validation of the length of the header */
1.9       itojun    874:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    875:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    876:        if (hbh == NULL) {
                    877:                ip6stat.ip6s_tooshort++;
                    878:                return -1;
                    879:        }
                    880:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    881:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    882:                hbhlen);
                    883:        if (hbh == NULL) {
                    884:                ip6stat.ip6s_tooshort++;
                    885:                return -1;
                    886:        }
1.57      thorpej   887:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    888:        off += hbhlen;
                    889:        hbhlen -= sizeof(struct ip6_hbh);
                    890:
                    891:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    892:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    893:                return (-1);
1.2       itojun    894:
                    895:        *offp = off;
                    896:        *mp = m;
1.58      itojun    897:        return (0);
1.2       itojun    898: }
                    899:
                    900: /*
                    901:  * Search header for all Hop-by-hop options and process each option.
                    902:  * This function is separate from ip6_hopopts_input() in order to
                    903:  * handle a case where the sending node itself process its hop-by-hop
                    904:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    905:  *
                    906:  * The function assumes that hbh header is located right after the IPv6 header
                    907:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    908:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    909:  */
                    910: int
                    911: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    912:        struct mbuf *m;
                    913:        u_int8_t *opthead;
                    914:        int hbhlen;
1.5       itojun    915:        u_int32_t *rtalertp;
1.2       itojun    916:        u_int32_t *plenp;
                    917: {
                    918:        struct ip6_hdr *ip6;
                    919:        int optlen = 0;
                    920:        u_int8_t *opt = opthead;
                    921:        u_int16_t rtalert_val;
1.22      itojun    922:        u_int32_t jumboplen;
1.55      itojun    923:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    924:
                    925:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    926:                switch (*opt) {
                    927:                case IP6OPT_PAD1:
                    928:                        optlen = 1;
                    929:                        break;
                    930:                case IP6OPT_PADN:
                    931:                        if (hbhlen < IP6OPT_MINLEN) {
                    932:                                ip6stat.ip6s_toosmall++;
                    933:                                goto bad;
                    934:                        }
                    935:                        optlen = *(opt + 1) + 2;
                    936:                        break;
                    937:                case IP6OPT_RTALERT:
                    938:                        /* XXX may need check for alignment */
                    939:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
                    940:                                ip6stat.ip6s_toosmall++;
                    941:                                goto bad;
                    942:                        }
                    943:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    944:                                /* XXX stat */
                    945:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    946:                                    ICMP6_PARAMPROB_HEADER,
                    947:                                    erroff + opt + 1 - opthead);
                    948:                                return (-1);
1.35      itojun    949:                        }
                    950:                        optlen = IP6OPT_RTALERT_LEN;
1.94.2.2  rmind     951:                        bcopy((void *)(opt + 2), (void *)&rtalert_val, 2);
1.35      itojun    952:                        *rtalertp = ntohs(rtalert_val);
                    953:                        break;
                    954:                case IP6OPT_JUMBO:
1.22      itojun    955:                        /* XXX may need check for alignment */
                    956:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    957:                                ip6stat.ip6s_toosmall++;
                    958:                                goto bad;
                    959:                        }
1.35      itojun    960:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    961:                                /* XXX stat */
                    962:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    963:                                    ICMP6_PARAMPROB_HEADER,
                    964:                                    erroff + opt + 1 - opthead);
                    965:                                return (-1);
1.35      itojun    966:                        }
1.22      itojun    967:                        optlen = IP6OPT_JUMBO_LEN;
                    968:
                    969:                        /*
                    970:                         * IPv6 packets that have non 0 payload length
1.35      itojun    971:                         * must not contain a jumbo payload option.
1.22      itojun    972:                         */
                    973:                        ip6 = mtod(m, struct ip6_hdr *);
                    974:                        if (ip6->ip6_plen) {
                    975:                                ip6stat.ip6s_badoptions++;
                    976:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    977:                                    ICMP6_PARAMPROB_HEADER,
                    978:                                    erroff + opt - opthead);
                    979:                                return (-1);
1.22      itojun    980:                        }
1.2       itojun    981:
1.22      itojun    982:                        /*
                    983:                         * We may see jumbolen in unaligned location, so
                    984:                         * we'd need to perform bcopy().
                    985:                         */
                    986:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    987:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    988:
                    989: #if 1
                    990:                        /*
                    991:                         * if there are multiple jumbo payload options,
                    992:                         * *plenp will be non-zero and the packet will be
                    993:                         * rejected.
                    994:                         * the behavior may need some debate in ipngwg -
                    995:                         * multiple options does not make sense, however,
                    996:                         * there's no explicit mention in specification.
                    997:                         */
                    998:                        if (*plenp != 0) {
                    999:                                ip6stat.ip6s_badoptions++;
                   1000:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1001:                                    ICMP6_PARAMPROB_HEADER,
                   1002:                                    erroff + opt + 2 - opthead);
                   1003:                                return (-1);
1.22      itojun   1004:                        }
1.8       itojun   1005: #endif
1.2       itojun   1006:
1.22      itojun   1007:                        /*
                   1008:                         * jumbo payload length must be larger than 65535.
                   1009:                         */
                   1010:                        if (jumboplen <= IPV6_MAXPACKET) {
                   1011:                                ip6stat.ip6s_badoptions++;
                   1012:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1013:                                    ICMP6_PARAMPROB_HEADER,
                   1014:                                    erroff + opt + 2 - opthead);
                   1015:                                return (-1);
1.22      itojun   1016:                        }
                   1017:                        *plenp = jumboplen;
                   1018:
                   1019:                        break;
1.35      itojun   1020:                default:                /* unknown option */
                   1021:                        if (hbhlen < IP6OPT_MINLEN) {
                   1022:                                ip6stat.ip6s_toosmall++;
                   1023:                                goto bad;
                   1024:                        }
1.55      itojun   1025:                        optlen = ip6_unknown_opt(opt, m,
                   1026:                            erroff + opt - opthead);
                   1027:                        if (optlen == -1)
                   1028:                                return (-1);
1.35      itojun   1029:                        optlen += 2;
                   1030:                        break;
1.2       itojun   1031:                }
                   1032:        }
                   1033:
1.55      itojun   1034:        return (0);
1.2       itojun   1035:
                   1036:   bad:
                   1037:        m_freem(m);
1.55      itojun   1038:        return (-1);
1.2       itojun   1039: }
                   1040:
                   1041: /*
                   1042:  * Unknown option processing.
                   1043:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1044:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1045:  * is not continuous in order to return an ICMPv6 error.
                   1046:  */
                   1047: int
                   1048: ip6_unknown_opt(optp, m, off)
                   1049:        u_int8_t *optp;
                   1050:        struct mbuf *m;
                   1051:        int off;
                   1052: {
                   1053:        struct ip6_hdr *ip6;
                   1054:
1.35      itojun   1055:        switch (IP6OPT_TYPE(*optp)) {
                   1056:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1057:                return ((int)*(optp + 1));
1.35      itojun   1058:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1059:                m_freem(m);
1.58      itojun   1060:                return (-1);
1.35      itojun   1061:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                   1062:                ip6stat.ip6s_badoptions++;
                   1063:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1064:                return (-1);
1.35      itojun   1065:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                   1066:                ip6stat.ip6s_badoptions++;
                   1067:                ip6 = mtod(m, struct ip6_hdr *);
                   1068:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1069:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1070:                        m_freem(m);
                   1071:                else
                   1072:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1073:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1074:                return (-1);
1.2       itojun   1075:        }
                   1076:
                   1077:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1078:        return (-1);
1.2       itojun   1079: }
                   1080:
                   1081: /*
1.9       itojun   1082:  * Create the "control" list for this pcb.
                   1083:  *
                   1084:  * The routine will be called from upper layer handlers like tcp6_input().
                   1085:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1086:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1087:  * very first mbuf on the mbuf chain.
                   1088:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1089:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1090:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1091:  */
                   1092: void
                   1093: ip6_savecontrol(in6p, mp, ip6, m)
1.35      itojun   1094:        struct in6pcb *in6p;
                   1095:        struct mbuf **mp;
                   1096:        struct ip6_hdr *ip6;
                   1097:        struct mbuf *m;
1.2       itojun   1098: {
1.85      rpaulo   1099: #ifdef RFC2292
                   1100: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1101: #else
                   1102: #define IS2292(x, y)   (y)
                   1103: #endif
                   1104:
1.9       itojun   1105: #ifdef SO_TIMESTAMP
1.2       itojun   1106:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                   1107:                struct timeval tv;
                   1108:
                   1109:                microtime(&tv);
1.94.2.2  rmind    1110:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1111:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1112:                if (*mp)
                   1113:                        mp = &(*mp)->m_next;
                   1114:        }
1.9       itojun   1115: #endif
1.87      rpaulo   1116:
                   1117:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1118:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1119:                return;
                   1120:
1.2       itojun   1121:        /* RFC 2292 sec. 5 */
1.35      itojun   1122:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1123:                struct in6_pktinfo pi6;
1.85      rpaulo   1124:
1.2       itojun   1125:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1.81      rpaulo   1126:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1127:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1128:                    m->m_pkthdr.rcvif->if_index : 0;
1.94.2.2  rmind    1129:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1130:                    sizeof(struct in6_pktinfo),
                   1131:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1132:                if (*mp)
                   1133:                        mp = &(*mp)->m_next;
                   1134:        }
1.85      rpaulo   1135:
1.2       itojun   1136:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1137:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1138:
1.94.2.2  rmind    1139:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1140:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1141:                if (*mp)
                   1142:                        mp = &(*mp)->m_next;
                   1143:        }
                   1144:
                   1145:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1146:                u_int32_t flowinfo;
                   1147:                int tclass;
                   1148:
                   1149:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1150:                flowinfo >>= 20;
                   1151:
                   1152:                tclass = flowinfo & 0xff;
1.94.2.2  rmind    1153:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1154:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1155:
1.2       itojun   1156:                if (*mp)
                   1157:                        mp = &(*mp)->m_next;
                   1158:        }
                   1159:
                   1160:        /*
1.75      itojun   1161:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1162:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1163:         * strict, since there might be some hop-by-hop options which can be
                   1164:         * returned to normal user.
1.85      rpaulo   1165:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1166:         */
1.75      itojun   1167:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1168:                /*
                   1169:                 * Check if a hop-by-hop options header is contatined in the
                   1170:                 * received packet, and if so, store the options as ancillary
                   1171:                 * data. Note that a hop-by-hop options header must be
                   1172:                 * just after the IPv6 header, which fact is assured through
                   1173:                 * the IPv6 input processing.
                   1174:                 */
1.78      christos 1175:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1176:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1177:                        struct ip6_hbh *hbh;
                   1178:                        int hbhlen;
1.62      itojun   1179:                        struct mbuf *ext;
1.9       itojun   1180:
1.62      itojun   1181:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1182:                            xip6->ip6_nxt);
1.62      itojun   1183:                        if (ext == NULL) {
1.9       itojun   1184:                                ip6stat.ip6s_tooshort++;
                   1185:                                return;
                   1186:                        }
1.62      itojun   1187:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1188:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1189:                        if (hbhlen != ext->m_len) {
                   1190:                                m_freem(ext);
1.9       itojun   1191:                                ip6stat.ip6s_tooshort++;
                   1192:                                return;
                   1193:                        }
1.2       itojun   1194:
                   1195:                        /*
                   1196:                         * XXX: We copy whole the header even if a jumbo
                   1197:                         * payload option is included, which option is to
                   1198:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1199:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1200:                         */
1.94.2.2  rmind    1201:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1202:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1203:                            IPPROTO_IPV6);
1.2       itojun   1204:                        if (*mp)
                   1205:                                mp = &(*mp)->m_next;
1.62      itojun   1206:                        m_freem(ext);
1.2       itojun   1207:                }
                   1208:        }
                   1209:
                   1210:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1211:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1212:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1213:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1214:
                   1215:                /*
                   1216:                 * Search for destination options headers or routing
                   1217:                 * header(s) through the header chain, and stores each
                   1218:                 * header as ancillary data.
                   1219:                 * Note that the order of the headers remains in
                   1220:                 * the chain of ancillary data.
                   1221:                 */
1.86      rpaulo   1222:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1223:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1224:                        int elen;
1.62      itojun   1225:                        struct mbuf *ext = NULL;
1.9       itojun   1226:
1.62      itojun   1227:                        /*
                   1228:                         * if it is not an extension header, don't try to
                   1229:                         * pull it from the chain.
                   1230:                         */
                   1231:                        switch (nxt) {
                   1232:                        case IPPROTO_DSTOPTS:
                   1233:                        case IPPROTO_ROUTING:
                   1234:                        case IPPROTO_HOPOPTS:
                   1235:                        case IPPROTO_AH: /* is it possible? */
                   1236:                                break;
                   1237:                        default:
                   1238:                                goto loopend;
                   1239:                        }
                   1240:
                   1241:                        ext = ip6_pullexthdr(m, off, nxt);
                   1242:                        if (ext == NULL) {
1.9       itojun   1243:                                ip6stat.ip6s_tooshort++;
                   1244:                                return;
                   1245:                        }
1.62      itojun   1246:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1247:                        if (nxt == IPPROTO_AH)
                   1248:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1249:                        else
                   1250:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1251:                        if (elen != ext->m_len) {
                   1252:                                m_freem(ext);
1.9       itojun   1253:                                ip6stat.ip6s_tooshort++;
                   1254:                                return;
                   1255:                        }
1.57      thorpej  1256:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1257:
1.35      itojun   1258:                        switch (nxt) {
1.62      itojun   1259:                        case IPPROTO_DSTOPTS:
1.35      itojun   1260:                                if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1261:                                        break;
                   1262:
1.94.2.2  rmind    1263:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1264:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1265:                                    IPPROTO_IPV6);
1.35      itojun   1266:                                if (*mp)
                   1267:                                        mp = &(*mp)->m_next;
                   1268:                                break;
                   1269:
                   1270:                        case IPPROTO_ROUTING:
                   1271:                                if (!in6p->in6p_flags & IN6P_RTHDR)
                   1272:                                        break;
                   1273:
1.94.2.2  rmind    1274:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1275:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1276:                                    IPPROTO_IPV6);
1.35      itojun   1277:                                if (*mp)
                   1278:                                        mp = &(*mp)->m_next;
                   1279:                                break;
                   1280:
1.62      itojun   1281:                        case IPPROTO_HOPOPTS:
                   1282:                        case IPPROTO_AH: /* is it possible? */
                   1283:                                break;
                   1284:
1.35      itojun   1285:                        default:
                   1286:                                /*
1.62      itojun   1287:                                 * other cases have been filtered in the above.
                   1288:                                 * none will visit this case.  here we supply
                   1289:                                 * the code just in case (nxt overwritten or
                   1290:                                 * other cases).
1.35      itojun   1291:                                 */
1.62      itojun   1292:                                m_freem(ext);
1.35      itojun   1293:                                goto loopend;
                   1294:
1.2       itojun   1295:                        }
                   1296:
                   1297:                        /* proceed with the next header. */
1.9       itojun   1298:                        off += elen;
1.2       itojun   1299:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1300:                        ip6e = NULL;
                   1301:                        m_freem(ext);
                   1302:                        ext = NULL;
1.2       itojun   1303:                }
                   1304:          loopend:
1.62      itojun   1305:                ;
1.2       itojun   1306:        }
1.62      itojun   1307: }
1.85      rpaulo   1308: #undef IS2292
                   1309:
                   1310:
                   1311: void
1.94.2.1  yamt     1312: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1313:     uint32_t *mtu)
1.85      rpaulo   1314: {
                   1315:        struct socket *so;
                   1316:        struct mbuf *m_mtu;
                   1317:        struct ip6_mtuinfo mtuctl;
                   1318:
                   1319:        so = in6p->in6p_socket;
                   1320:
                   1321:        if (mtu == NULL)
                   1322:                return;
                   1323:
                   1324: #ifdef DIAGNOSTIC
                   1325:        if (so == NULL)         /* I believe this is impossible */
                   1326:                panic("ip6_notify_pmtu: socket is NULL");
                   1327: #endif
                   1328:
                   1329:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1330:        mtuctl.ip6m_mtu = *mtu;
                   1331:        mtuctl.ip6m_addr = *dst;
                   1332:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1333:                return;
                   1334:
1.94.2.2  rmind    1335:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1336:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1337:                return;
                   1338:
1.94.2.1  yamt     1339:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1340:            == 0) {
                   1341:                m_freem(m_mtu);
                   1342:                /* XXX: should count statistics */
                   1343:        } else
                   1344:                sorwakeup(so);
                   1345:
                   1346:        return;
                   1347: }
1.62      itojun   1348:
                   1349: /*
                   1350:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1351:  * contains the result, or NULL on error.
                   1352:  */
                   1353: static struct mbuf *
                   1354: ip6_pullexthdr(m, off, nxt)
                   1355:        struct mbuf *m;
                   1356:        size_t off;
                   1357:        int nxt;
                   1358: {
                   1359:        struct ip6_ext ip6e;
                   1360:        size_t elen;
                   1361:        struct mbuf *n;
                   1362:
                   1363: #ifdef DIAGNOSTIC
                   1364:        switch (nxt) {
                   1365:        case IPPROTO_DSTOPTS:
                   1366:        case IPPROTO_ROUTING:
                   1367:        case IPPROTO_HOPOPTS:
                   1368:        case IPPROTO_AH: /* is it possible? */
                   1369:                break;
                   1370:        default:
                   1371:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1372:        }
1.62      itojun   1373: #endif
1.2       itojun   1374:
1.94.2.2  rmind    1375:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1376:        if (nxt == IPPROTO_AH)
                   1377:                elen = (ip6e.ip6e_len + 2) << 2;
                   1378:        else
                   1379:                elen = (ip6e.ip6e_len + 1) << 3;
                   1380:
                   1381:        MGET(n, M_DONTWAIT, MT_DATA);
                   1382:        if (n && elen >= MLEN) {
                   1383:                MCLGET(n, M_DONTWAIT);
                   1384:                if ((n->m_flags & M_EXT) == 0) {
                   1385:                        m_free(n);
                   1386:                        n = NULL;
                   1387:                }
                   1388:        }
                   1389:        if (!n)
                   1390:                return NULL;
                   1391:
                   1392:        n->m_len = 0;
                   1393:        if (elen >= M_TRAILINGSPACE(n)) {
                   1394:                m_free(n);
                   1395:                return NULL;
                   1396:        }
                   1397:
1.94.2.2  rmind    1398:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1399:        n->m_len = elen;
                   1400:        return n;
1.2       itojun   1401: }
                   1402:
                   1403: /*
                   1404:  * Get pointer to the previous header followed by the header
                   1405:  * currently processed.
                   1406:  * XXX: This function supposes that
                   1407:  *     M includes all headers,
                   1408:  *     the next header field and the header length field of each header
                   1409:  *     are valid, and
                   1410:  *     the sum of each header length equals to OFF.
                   1411:  * Because of these assumptions, this function must be called very
                   1412:  * carefully. Moreover, it will not be used in the near future when
                   1413:  * we develop `neater' mechanism to process extension headers.
                   1414:  */
1.58      itojun   1415: u_int8_t *
1.2       itojun   1416: ip6_get_prevhdr(m, off)
                   1417:        struct mbuf *m;
                   1418:        int off;
                   1419: {
                   1420:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1421:
                   1422:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1423:                return (&ip6->ip6_nxt);
1.2       itojun   1424:        else {
                   1425:                int len, nxt;
                   1426:                struct ip6_ext *ip6e = NULL;
                   1427:
                   1428:                nxt = ip6->ip6_nxt;
                   1429:                len = sizeof(struct ip6_hdr);
                   1430:                while (len < off) {
1.94.2.2  rmind    1431:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1432:
1.35      itojun   1433:                        switch (nxt) {
1.2       itojun   1434:                        case IPPROTO_FRAGMENT:
                   1435:                                len += sizeof(struct ip6_frag);
                   1436:                                break;
                   1437:                        case IPPROTO_AH:
                   1438:                                len += (ip6e->ip6e_len + 2) << 2;
                   1439:                                break;
                   1440:                        default:
                   1441:                                len += (ip6e->ip6e_len + 1) << 3;
                   1442:                                break;
                   1443:                        }
                   1444:                        nxt = ip6e->ip6e_nxt;
                   1445:                }
                   1446:                if (ip6e)
1.58      itojun   1447:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1448:                else
                   1449:                        return NULL;
1.18      itojun   1450:        }
                   1451: }
                   1452:
                   1453: /*
                   1454:  * get next header offset.  m will be retained.
                   1455:  */
                   1456: int
                   1457: ip6_nexthdr(m, off, proto, nxtp)
                   1458:        struct mbuf *m;
                   1459:        int off;
                   1460:        int proto;
                   1461:        int *nxtp;
                   1462: {
                   1463:        struct ip6_hdr ip6;
                   1464:        struct ip6_ext ip6e;
                   1465:        struct ip6_frag fh;
                   1466:
                   1467:        /* just in case */
                   1468:        if (m == NULL)
                   1469:                panic("ip6_nexthdr: m == NULL");
                   1470:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1471:                return -1;
                   1472:
                   1473:        switch (proto) {
                   1474:        case IPPROTO_IPV6:
1.83      rpaulo   1475:                /* do not chase beyond intermediate IPv6 headers */
                   1476:                if (off != 0)
                   1477:                        return -1;
1.18      itojun   1478:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1479:                        return -1;
1.94.2.2  rmind    1480:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1481:                if (nxtp)
                   1482:                        *nxtp = ip6.ip6_nxt;
                   1483:                off += sizeof(ip6);
                   1484:                return off;
                   1485:
                   1486:        case IPPROTO_FRAGMENT:
                   1487:                /*
                   1488:                 * terminate parsing if it is not the first fragment,
                   1489:                 * it does not make sense to parse through it.
                   1490:                 */
                   1491:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1492:                        return -1;
1.94.2.2  rmind    1493:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1494:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1495:                        return -1;
                   1496:                if (nxtp)
                   1497:                        *nxtp = fh.ip6f_nxt;
                   1498:                off += sizeof(struct ip6_frag);
                   1499:                return off;
                   1500:
                   1501:        case IPPROTO_AH:
                   1502:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1503:                        return -1;
1.94.2.2  rmind    1504:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1505:                if (nxtp)
                   1506:                        *nxtp = ip6e.ip6e_nxt;
                   1507:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1508:                if (m->m_pkthdr.len < off)
                   1509:                        return -1;
1.18      itojun   1510:                return off;
                   1511:
                   1512:        case IPPROTO_HOPOPTS:
                   1513:        case IPPROTO_ROUTING:
                   1514:        case IPPROTO_DSTOPTS:
                   1515:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1516:                        return -1;
1.94.2.2  rmind    1517:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1518:                if (nxtp)
                   1519:                        *nxtp = ip6e.ip6e_nxt;
                   1520:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1521:                if (m->m_pkthdr.len < off)
                   1522:                        return -1;
1.18      itojun   1523:                return off;
                   1524:
                   1525:        case IPPROTO_NONE:
                   1526:        case IPPROTO_ESP:
                   1527:        case IPPROTO_IPCOMP:
                   1528:                /* give up */
                   1529:                return -1;
                   1530:
                   1531:        default:
                   1532:                return -1;
                   1533:        }
                   1534: }
                   1535:
                   1536: /*
                   1537:  * get offset for the last header in the chain.  m will be kept untainted.
                   1538:  */
                   1539: int
                   1540: ip6_lasthdr(m, off, proto, nxtp)
                   1541:        struct mbuf *m;
                   1542:        int off;
                   1543:        int proto;
                   1544:        int *nxtp;
                   1545: {
                   1546:        int newoff;
                   1547:        int nxt;
                   1548:
                   1549:        if (!nxtp) {
                   1550:                nxt = -1;
                   1551:                nxtp = &nxt;
                   1552:        }
1.86      rpaulo   1553:        for (;;) {
1.18      itojun   1554:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1555:                if (newoff < 0)
                   1556:                        return off;
                   1557:                else if (newoff < off)
                   1558:                        return -1;      /* invalid */
                   1559:                else if (newoff == off)
                   1560:                        return newoff;
                   1561:
                   1562:                off = newoff;
                   1563:                proto = *nxtp;
1.2       itojun   1564:        }
                   1565: }
                   1566:
1.81      rpaulo   1567: struct m_tag *
                   1568: ip6_addaux(m)
                   1569:        struct mbuf *m;
                   1570: {
                   1571:        struct m_tag *mtag;
                   1572:
                   1573:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1574:        if (!mtag) {
                   1575:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1576:                    M_NOWAIT);
                   1577:                if (mtag) {
                   1578:                        m_tag_prepend(m, mtag);
                   1579:                        bzero(mtag + 1, sizeof(struct ip6aux));
                   1580:                }
                   1581:        }
                   1582:        return mtag;
                   1583: }
                   1584:
                   1585: struct m_tag *
                   1586: ip6_findaux(m)
                   1587:        struct mbuf *m;
                   1588: {
                   1589:        struct m_tag *mtag;
                   1590:
                   1591:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1592:        return mtag;
                   1593: }
                   1594:
                   1595: void
                   1596: ip6_delaux(m)
                   1597:        struct mbuf *m;
                   1598: {
                   1599:        struct m_tag *mtag;
                   1600:
                   1601:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1602:        if (mtag)
                   1603:                m_tag_delete(m, mtag);
                   1604: }
                   1605:
1.94.2.2  rmind    1606: #ifdef GATEWAY
                   1607: /*
                   1608:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1609:  * we could reduce this value, call ip6flow_reap();
                   1610:  */
                   1611: static int
1.94.2.3  yamt     1612: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.94.2.2  rmind    1613: {
                   1614:         int s;
                   1615:
                   1616:         s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.94.2.3  yamt     1617:         if (s || newp == NULL)
1.94.2.2  rmind    1618:                 return (s);
                   1619:
                   1620:         s = splsoftnet();
                   1621:         ip6flow_reap(0);
                   1622:         splx(s);
                   1623:
                   1624:         return (0);
                   1625: }
1.94.2.3  yamt     1626:
                   1627: static int
                   1628: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1629: {
                   1630:        int error, tmp;
                   1631:        struct sysctlnode node;
                   1632:
                   1633:        node = *rnode;
                   1634:        tmp = ip6_hashsize;
                   1635:        node.sysctl_data = &tmp;
                   1636:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1637:        if (error || newp == NULL)
                   1638:                return (error);
                   1639:
                   1640:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1641:                /*
                   1642:                 * Can only fail due to malloc()
                   1643:                 */
                   1644:                if (ip6flow_invalidate_all(tmp))
                   1645:                        return ENOMEM;
                   1646:        } else {
                   1647:                /*
                   1648:                 * EINVAL if not a power of 2
                   1649:                 */
                   1650:                return EINVAL;
                   1651:        }
                   1652:
                   1653:        return (0);
                   1654: }
1.94.2.2  rmind    1655: #endif /* GATEWAY */
                   1656:
1.94.2.4! yamt     1657: static int
        !          1658: sysctl_net_inet6_ip6_rht0(SYSCTLFN_ARGS)
        !          1659: {
        !          1660:        int error, tmp;
        !          1661:        struct sysctlnode node;
        !          1662:
        !          1663:        node = *rnode;
        !          1664:        tmp = ip6_rht0;
        !          1665:        node.sysctl_data = &tmp;
        !          1666:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
        !          1667:        if (error || newp == NULL)
        !          1668:                return error;
        !          1669:
        !          1670:        switch (tmp) {
        !          1671:        case -1:        /* disable processing */
        !          1672:        case 0:         /* disable for host, enable for router */
        !          1673:        case 1:         /* enable for all */
        !          1674:                break;
        !          1675:        default:
        !          1676:                return EINVAL;
        !          1677:        }
        !          1678:        ip6_rht0 = tmp;
        !          1679:        return 0;
        !          1680: }
        !          1681:
1.2       itojun   1682: /*
                   1683:  * System control for IP6
                   1684:  */
                   1685:
                   1686: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1687:        0,              0,              0,              0,
                   1688:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1689:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1690:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1691:        0,              0,              0,              0,
                   1692:        ENOPROTOOPT
                   1693: };
                   1694:
1.70      atatat   1695: SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1.2       itojun   1696: {
1.85      rpaulo   1697: #ifdef RFC2292
                   1698: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1699: #else
                   1700: #define IS2292(x, y)   (y)
                   1701: #endif
1.26      itojun   1702:
1.73      atatat   1703:        sysctl_createv(clog, 0, NULL, NULL,
                   1704:                       CTLFLAG_PERMANENT,
1.70      atatat   1705:                       CTLTYPE_NODE, "net", NULL,
                   1706:                       NULL, 0, NULL, 0,
                   1707:                       CTL_NET, CTL_EOL);
1.73      atatat   1708:        sysctl_createv(clog, 0, NULL, NULL,
                   1709:                       CTLFLAG_PERMANENT,
1.74      atatat   1710:                       CTLTYPE_NODE, "inet6",
                   1711:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1712:                       NULL, 0, NULL, 0,
                   1713:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1714:        sysctl_createv(clog, 0, NULL, NULL,
                   1715:                       CTLFLAG_PERMANENT,
1.74      atatat   1716:                       CTLTYPE_NODE, "ip6",
                   1717:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1718:                       NULL, 0, NULL, 0,
                   1719:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1720:
1.73      atatat   1721:        sysctl_createv(clog, 0, NULL, NULL,
                   1722:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1723:                       CTLTYPE_INT, "forwarding",
                   1724:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1725:                       NULL, 0, &ip6_forwarding, 0,
                   1726:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1727:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1728:        sysctl_createv(clog, 0, NULL, NULL,
                   1729:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1730:                       CTLTYPE_INT, "redirect",
                   1731:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1732:                       NULL, 0, &ip6_sendredirects, 0,
                   1733:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1734:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1735:        sysctl_createv(clog, 0, NULL, NULL,
                   1736:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1737:                       CTLTYPE_INT, "hlim",
                   1738:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1739:                       NULL, 0, &ip6_defhlim, 0,
                   1740:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1741:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1742: #ifdef notyet
1.73      atatat   1743:        sysctl_createv(clog, 0, NULL, NULL,
                   1744:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1745:                       CTLTYPE_INT, "mtu", NULL,
                   1746:                       NULL, 0, &, 0,
                   1747:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1748:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1749: #endif
                   1750: #ifdef __no_idea__
1.73      atatat   1751:        sysctl_createv(clog, 0, NULL, NULL,
                   1752:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1753:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1754:                       NULL, 0, &?, 0,
                   1755:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1756:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1757:        sysctl_createv(clog, 0, NULL, NULL,
                   1758:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1759:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1760:                       NULL, 0, &?, sizeof(?),
                   1761:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1762:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1763:        sysctl_createv(clog, 0, NULL, NULL,
                   1764:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1765:                       CTLTYPE_?, "mrtproto", NULL,
                   1766:                       NULL, 0, &?, sizeof(?),
                   1767:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1768:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1769: #endif
1.73      atatat   1770:        sysctl_createv(clog, 0, NULL, NULL,
                   1771:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1772:                       CTLTYPE_INT, "maxfragpackets",
                   1773:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1774:                                    "for reassembly"),
1.70      atatat   1775:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1776:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1777:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1778: #ifdef __no_idea__
1.73      atatat   1779:        sysctl_createv(clog, 0, NULL, NULL,
                   1780:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1781:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1782:                       NULL, 0, &?, 0,
                   1783:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1784:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1785:        sysctl_createv(clog, 0, NULL, NULL,
                   1786:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1787:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1788:                       NULL, 0, &?, 0,
                   1789:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1790:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1791: #endif
1.73      atatat   1792:        sysctl_createv(clog, 0, NULL, NULL,
                   1793:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1794:                       CTLTYPE_INT, "accept_rtadv",
                   1795:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1796:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1797:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1798:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1799:        sysctl_createv(clog, 0, NULL, NULL,
                   1800:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1801:                       CTLTYPE_INT, "keepfaith",
                   1802:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1803:                       NULL, 0, &ip6_keepfaith, 0,
                   1804:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1805:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1806:        sysctl_createv(clog, 0, NULL, NULL,
                   1807:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1808:                       CTLTYPE_INT, "log_interval",
                   1809:                       SYSCTL_DESCR("Minumum interval between logging "
                   1810:                                    "unroutable packets"),
1.70      atatat   1811:                       NULL, 0, &ip6_log_interval, 0,
                   1812:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1813:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1814:        sysctl_createv(clog, 0, NULL, NULL,
                   1815:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1816:                       CTLTYPE_INT, "hdrnestlimit",
                   1817:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1818:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1819:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1820:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1821:        sysctl_createv(clog, 0, NULL, NULL,
                   1822:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1823:                       CTLTYPE_INT, "dad_count",
                   1824:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1825:                                    "probes to send"),
1.70      atatat   1826:                       NULL, 0, &ip6_dad_count, 0,
                   1827:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1828:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1829:        sysctl_createv(clog, 0, NULL, NULL,
                   1830:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1831:                       CTLTYPE_INT, "auto_flowlabel",
                   1832:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1833:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1834:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1835:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1836:        sysctl_createv(clog, 0, NULL, NULL,
                   1837:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1838:                       CTLTYPE_INT, "defmcasthlim",
                   1839:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1840:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1841:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1842:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1843: #if NGIF > 0
1.73      atatat   1844:        sysctl_createv(clog, 0, NULL, NULL,
                   1845:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1846:                       CTLTYPE_INT, "gifhlim",
                   1847:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1848:                       NULL, 0, &ip6_gif_hlim, 0,
                   1849:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1850:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1851: #endif /* NGIF */
1.73      atatat   1852:        sysctl_createv(clog, 0, NULL, NULL,
                   1853:                       CTLFLAG_PERMANENT,
1.74      atatat   1854:                       CTLTYPE_STRING, "kame_version",
                   1855:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1856:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1857:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1858:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1859:        sysctl_createv(clog, 0, NULL, NULL,
                   1860:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1861:                       CTLTYPE_INT, "use_deprecated",
                   1862:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1863:                                    "source addresses"),
1.70      atatat   1864:                       NULL, 0, &ip6_use_deprecated, 0,
                   1865:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1866:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1867:        sysctl_createv(clog, 0, NULL, NULL,
                   1868:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1869:                       CTLTYPE_INT, "rr_prune", NULL,
                   1870:                       NULL, 0, &ip6_rr_prune, 0,
                   1871:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1872:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1873:        sysctl_createv(clog, 0, NULL, NULL,
                   1874:                       CTLFLAG_PERMANENT
1.70      atatat   1875: #ifndef INET6_BINDV6ONLY
1.73      atatat   1876:                       |CTLFLAG_READWRITE,
1.70      atatat   1877: #endif
1.74      atatat   1878:                       CTLTYPE_INT, "v6only",
                   1879:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1880:                                    "to PF_INET sockets"),
1.70      atatat   1881:                       NULL, 0, &ip6_v6only, 0,
                   1882:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1883:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1884:        sysctl_createv(clog, 0, NULL, NULL,
                   1885:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1886:                       CTLTYPE_INT, "anonportmin",
                   1887:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1888:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1889:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1890:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1891:        sysctl_createv(clog, 0, NULL, NULL,
                   1892:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1893:                       CTLTYPE_INT, "anonportmax",
                   1894:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1895:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1896:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1897:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1898: #ifndef IPNOPRIVPORTS
1.73      atatat   1899:        sysctl_createv(clog, 0, NULL, NULL,
                   1900:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1901:                       CTLTYPE_INT, "lowportmin",
                   1902:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1903:                                    "to assign"),
1.70      atatat   1904:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1905:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1906:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1907:        sysctl_createv(clog, 0, NULL, NULL,
                   1908:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1909:                       CTLTYPE_INT, "lowportmax",
                   1910:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1911:                                    "to assign"),
1.70      atatat   1912:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1913:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1914:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1915: #endif /* IPNOPRIVPORTS */
1.73      atatat   1916:        sysctl_createv(clog, 0, NULL, NULL,
                   1917:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1918:                       CTLTYPE_INT, "use_tempaddr",
                   1919:                       SYSCTL_DESCR("Use temporary address"),
                   1920:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1921:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1922:                       CTL_CREATE, CTL_EOL);
                   1923:        sysctl_createv(clog, 0, NULL, NULL,
                   1924:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1925:                       CTLTYPE_INT, "temppltime",
                   1926:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1927:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1928:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1929:                       CTL_CREATE, CTL_EOL);
                   1930:        sysctl_createv(clog, 0, NULL, NULL,
                   1931:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1932:                       CTLTYPE_INT, "tempvltime",
                   1933:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1934:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1935:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1936:                       CTL_CREATE, CTL_EOL);
                   1937:        sysctl_createv(clog, 0, NULL, NULL,
                   1938:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1939:                       CTLTYPE_INT, "maxfrags",
                   1940:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1941:                       NULL, 0, &ip6_maxfrags, 0,
                   1942:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1943:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1944:        sysctl_createv(clog, 0, NULL, NULL,
                   1945:                       CTLFLAG_PERMANENT,
                   1946:                       CTLTYPE_STRUCT, "stats",
                   1947:                       SYSCTL_DESCR("IPv6 statistics"),
                   1948:                       NULL, 0, &ip6stat, sizeof(ip6stat),
                   1949:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1950:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1951:        sysctl_createv(clog, 0, NULL, NULL,
                   1952:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1953:                       CTLTYPE_INT, "use_defaultzone",
                   1954:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1955:                       NULL, 0, &ip6_use_defzone, 0,
                   1956:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1957:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1958:        sysctl_createv(clog, 0, NULL, NULL,
                   1959:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1960:                       CTLTYPE_INT, "mcast_pmtu",
                   1961:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1962:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1963:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1964:                       CTL_CREATE, CTL_EOL);
1.94.2.2  rmind    1965: #ifdef GATEWAY
                   1966:        sysctl_createv(clog, 0, NULL, NULL,
                   1967:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1968:                        CTLTYPE_INT, "maxflows",
                   1969:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.94.2.3  yamt     1970:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
                   1971:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1972:                        CTL_CREATE, CTL_EOL);
                   1973:        sysctl_createv(clog, 0, NULL, NULL,
                   1974:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1975:                        CTLTYPE_INT, "hashsize",
                   1976:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1977:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
1.94.2.2  rmind    1978:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1979:                        CTL_CREATE, CTL_EOL);
                   1980: #endif
1.94.2.4! yamt     1981:        sysctl_createv(clog, 0, NULL, NULL,
        !          1982:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
        !          1983:                        CTLTYPE_INT, "rht0",
        !          1984:                        SYSCTL_DESCR("Processing of routing header type 0 (IPv6)"),
        !          1985:                        sysctl_net_inet6_ip6_rht0, 0, &ip6_rht0, 0,
        !          1986:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
        !          1987:                        CTL_CREATE, CTL_EOL);
1.2       itojun   1988: }

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