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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.132.2.1

1.132.2.1! yamt        1: /*     $NetBSD: ip6_input.c,v 1.132 2011/06/01 22:59:44 dyoung 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>
1.132.2.1! yamt       65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.132 2011/06/01 22:59:44 dyoung Exp $");
1.2       itojun     66:
1.129     joerg      67: #include "opt_gateway.h"
1.2       itojun     68: #include "opt_inet.h"
1.85      rpaulo     69: #include "opt_inet6.h"
1.4       thorpej    70: #include "opt_ipsec.h"
1.15      darrenr    71: #include "opt_pfil_hooks.h"
1.123     christos   72: #include "opt_compat_netbsd.h"
1.2       itojun     73:
                     74: #include <sys/param.h>
                     75: #include <sys/systm.h>
                     76: #include <sys/malloc.h>
                     77: #include <sys/mbuf.h>
                     78: #include <sys/domain.h>
                     79: #include <sys/protosw.h>
                     80: #include <sys/socket.h>
                     81: #include <sys/socketvar.h>
                     82: #include <sys/errno.h>
                     83: #include <sys/time.h>
                     84: #include <sys/kernel.h>
                     85: #include <sys/syslog.h>
                     86: #include <sys/proc.h>
1.46      simonb     87: #include <sys/sysctl.h>
1.132.2.1! yamt       88: #include <sys/cprng.h>
1.2       itojun     89:
                     90: #include <net/if.h>
                     91: #include <net/if_types.h>
                     92: #include <net/if_dl.h>
                     93: #include <net/route.h>
                     94: #include <net/netisr.h>
1.15      darrenr    95: #ifdef PFIL_HOOKS
                     96: #include <net/pfil.h>
                     97: #endif
1.2       itojun     98:
                     99: #include <netinet/in.h>
1.9       itojun    100: #include <netinet/in_systm.h>
                    101: #ifdef INET
                    102: #include <netinet/ip.h>
                    103: #include <netinet/ip_icmp.h>
1.45      itojun    104: #endif /* INET */
1.14      itojun    105: #include <netinet/ip6.h>
1.2       itojun    106: #include <netinet6/in6_var.h>
1.11      itojun    107: #include <netinet6/ip6_var.h>
1.116     thorpej   108: #include <netinet6/ip6_private.h>
1.2       itojun    109: #include <netinet6/in6_pcb.h>
1.14      itojun    110: #include <netinet/icmp6.h>
1.81      rpaulo    111: #include <netinet6/scope6_var.h>
1.2       itojun    112: #include <netinet6/in6_ifattach.h>
                    113: #include <netinet6/nd6.h>
                    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:
1.123     christos  121: #ifdef COMPAT_50
                    122: #include <compat/sys/time.h>
                    123: #include <compat/sys/socket.h>
                    124: #endif
                    125:
1.2       itojun    126: #include <netinet6/ip6protosw.h>
                    127:
                    128: #include "faith.h"
                    129: #include "gif.h"
1.50      itojun    130:
                    131: #if NGIF > 0
                    132: #include <netinet6/in6_gif.h>
                    133: #endif
1.2       itojun    134:
1.9       itojun    135: #include <net/net_osdep.h>
                    136:
1.2       itojun    137: extern struct domain inet6domain;
                    138:
                    139: u_char ip6_protox[IPPROTO_MAX];
                    140: static int ip6qmaxlen = IFQ_MAXLEN;
                    141: struct in6_ifaddr *in6_ifaddr;
                    142: struct ifqueue ip6intrq;
                    143:
1.108     ad        144: extern callout_t in6_tmpaddrtimer_ch;
1.83      rpaulo    145:
1.2       itojun    146: int ip6_forward_srcrt;                 /* XXX */
                    147: int ip6_sourcecheck;                   /* XXX */
                    148: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    149:
1.29      thorpej   150: #ifdef PFIL_HOOKS
                    151: struct pfil_head inet6_pfil_hook;
                    152: #endif
                    153:
1.116     thorpej   154: percpu_t *ip6stat_percpu;
1.2       itojun    155:
1.111     dyoung    156: static void ip6_init2(void *);
1.112     dyoung    157: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    158:
1.132.2.1! yamt      159: static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
        !           160:        u_int32_t *);
1.111     dyoung    161: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128     pooka     162: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2       itojun    163:
                    164: /*
                    165:  * IP6 initialization: fill in IP6 protocol switch table.
                    166:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    167:  */
                    168: void
1.114     matt      169: ip6_init(void)
1.2       itojun    170: {
1.78      christos  171:        const struct ip6protosw *pr;
1.35      itojun    172:        int i;
1.2       itojun    173:
1.128     pooka     174:        sysctl_net_inet6_ip6_setup(NULL);
1.78      christos  175:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    176:        if (pr == 0)
                    177:                panic("ip6_init");
                    178:        for (i = 0; i < IPPROTO_MAX; i++)
                    179:                ip6_protox[i] = pr - inet6sw;
1.78      christos  180:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    181:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    182:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    183:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    184:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    185:        ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81      rpaulo    186:        scope6_init();
                    187:        addrsel_policy_init();
1.2       itojun    188:        nd6_init();
                    189:        frag6_init();
1.132.2.1! yamt      190:        ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    191:
1.132.2.1! yamt      192:        ip6_init2(NULL);
1.98      liamjfoy  193: #ifdef GATEWAY
1.99      liamjfoy  194:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  195: #endif
1.29      thorpej   196:
                    197: #ifdef PFIL_HOOKS
                    198:        /* Register our Packet Filter hook. */
1.33      thorpej   199:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    200:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   201:        i = pfil_head_register(&inet6_pfil_hook);
                    202:        if (i != 0)
                    203:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    204:                    "error %d\n", i);
                    205: #endif /* PFIL_HOOKS */
1.116     thorpej   206:
                    207:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2       itojun    208: }
                    209:
                    210: static void
1.90      christos  211: ip6_init2(void *dummy)
1.2       itojun    212: {
                    213:
                    214:        /* nd6_timer_init */
1.118     ad        215:        callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19      thorpej   216:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    217:
                    218:        /* timer for regeneranation of temporary addresses randomize ID */
1.118     ad        219:        callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83      rpaulo    220:        callout_reset(&in6_tmpaddrtimer_ch,
                    221:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    222:                       ip6_temp_regen_advance) * hz,
                    223:                      in6_tmpaddrtimer, NULL);
1.2       itojun    224: }
                    225:
                    226: /*
                    227:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    228:  */
                    229: void
1.114     matt      230: ip6intr(void)
1.2       itojun    231: {
                    232:        int s;
                    233:        struct mbuf *m;
                    234:
1.118     ad        235:        mutex_enter(softnet_lock);
                    236:        KERNEL_LOCK(1, NULL);
1.2       itojun    237:        for (;;) {
1.41      thorpej   238:                s = splnet();
1.2       itojun    239:                IF_DEQUEUE(&ip6intrq, m);
                    240:                splx(s);
                    241:                if (m == 0)
1.118     ad        242:                        break;
1.83      rpaulo    243:                /* drop the packet if IPv6 operation is disabled on the IF */
                    244:                if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    245:                        m_freem(m);
1.118     ad        246:                        break;
1.83      rpaulo    247:                }
1.2       itojun    248:                ip6_input(m);
                    249:        }
1.118     ad        250:        KERNEL_UNLOCK_ONE(NULL);
                    251:        mutex_exit(softnet_lock);
1.2       itojun    252: }
                    253:
1.103     dyoung    254: extern struct  route ip6_forward_rt;
1.2       itojun    255:
                    256: void
1.96      dyoung    257: ip6_input(struct mbuf *m)
1.2       itojun    258: {
1.9       itojun    259:        struct ip6_hdr *ip6;
1.105     dyoung    260:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    261:        u_int32_t plen;
1.5       itojun    262:        u_int32_t rtalert = ~0;
1.104     yamt      263:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    264:        struct ifnet *deliverifp = NULL;
1.64      itojun    265:        int srcrt = 0;
1.105     dyoung    266:        const struct rtentry *rt;
                    267:        union {
                    268:                struct sockaddr         dst;
                    269:                struct sockaddr_in6     dst6;
                    270:        } u;
1.94      degroote  271: #ifdef FAST_IPSEC
                    272:        struct m_tag *mtag;
                    273:        struct tdb_ident *tdbi;
                    274:        struct secpolicy *sp;
                    275:        int s, error;
                    276: #endif
1.2       itojun    277:
                    278:        /*
1.81      rpaulo    279:         * make sure we don't have onion peering information into m_tag.
                    280:         */
                    281:        ip6_delaux(m);
                    282:
                    283:        /*
1.44      itojun    284:         * mbuf statistics
1.2       itojun    285:         */
                    286:        if (m->m_flags & M_EXT) {
                    287:                if (m->m_next)
1.116     thorpej   288:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    289:                else
1.116     thorpej   290:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    291:        } else {
1.115     thorpej   292: #define M2MMAX 32
1.2       itojun    293:                if (m->m_next) {
1.9       itojun    294:                        if (m->m_flags & M_LOOP) {
1.116     thorpej   295:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115     thorpej   296:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116     thorpej   297:                                IP6_STATINC(IP6_STAT_M2M +
                    298:                                            m->m_pkthdr.rcvif->if_index);
1.115     thorpej   299:                        } else
1.116     thorpej   300:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    301:                } else
1.116     thorpej   302:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    303: #undef M2MMAX
1.2       itojun    304:        }
                    305:
1.9       itojun    306:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116     thorpej   307:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    308:
1.57      thorpej   309:        /*
                    310:         * If the IPv6 header is not aligned, slurp it up into a new
                    311:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    312:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   313:         * IPv6 header is in the first mbuf of the chain.
                    314:         */
1.97      christos  315:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   316:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    317:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    318:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    319:                        /* XXXJRT new stat, please */
1.116     thorpej   320:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.57      thorpej   321:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    322:                        return;
                    323:                }
                    324:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    325:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    326:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116     thorpej   327:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.9       itojun    328:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    329:                        return;
                    330:                }
1.2       itojun    331:        }
                    332:
                    333:        ip6 = mtod(m, struct ip6_hdr *);
                    334:
                    335:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116     thorpej   336:                IP6_STATINC(IP6_STAT_BADVERS);
1.9       itojun    337:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    338:                goto bad;
                    339:        }
1.15      darrenr   340:
1.98      liamjfoy  341:        /*
                    342:         * Assume that we can create a fast-forward IP flow entry
                    343:         * based on this packet.
                    344:         */
                    345:        m->m_flags |= M_CANFASTFWD;
                    346:
1.15      darrenr   347: #ifdef PFIL_HOOKS
                    348:        /*
                    349:         * Run through list of hooks for input packets.  If there are any
                    350:         * filters which require that additional packets in the flow are
                    351:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    352:         * Note that filters must _never_ set this flag, as another filter
                    353:         * in the list may have previously cleared it.
                    354:         */
1.39      itojun    355:        /*
                    356:         * let ipfilter look at packet on the wire,
                    357:         * not the decapsulated packet.
                    358:         */
1.132.2.1! yamt      359: #if defined(FAST_IPSEC)
1.94      degroote  360:        if (!ipsec_indone(m))
1.39      itojun    361: #else
                    362:        if (1)
                    363: #endif
                    364:        {
1.64      itojun    365:                struct in6_addr odst;
                    366:
                    367:                odst = ip6->ip6_dst;
1.39      itojun    368:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    369:                                   PFIL_IN) != 0)
                    370:                        return;
                    371:                if (m == NULL)
                    372:                        return;
                    373:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    374:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    375:        }
1.15      darrenr   376: #endif /* PFIL_HOOKS */
                    377:
1.116     thorpej   378:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    379:
1.30      thorpej   380: #ifdef ALTQ
                    381:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    382:                /* packet is dropped by traffic conditioner */
                    383:                return;
1.9       itojun    384:        }
                    385: #endif
                    386:
1.2       itojun    387:        /*
1.44      itojun    388:         * Check against address spoofing/corruption.
1.2       itojun    389:         */
                    390:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    391:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    392:                /*
                    393:                 * XXX: "badscope" is not very suitable for a multicast source.
                    394:                 */
1.116     thorpej   395:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.9       itojun    396:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    397:                goto bad;
                    398:        }
1.13      itojun    399:        /*
1.44      itojun    400:         * The following check is not documented in specs.  A malicious
                    401:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    402:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    403:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    404:         *
1.44      itojun    405:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    406:         * support IPv4-less kernel compilation, we cannot support SIIT
                    407:         * environment at all.  So, it makes more sense for us to reject any
                    408:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       409:         * partial support for SIIT environment.
1.13      itojun    410:         */
                    411:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    412:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   413:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    414:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    415:                goto bad;
                    416:        }
1.17      itojun    417: #if 0
1.13      itojun    418:        /*
1.17      itojun    419:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    420:         *
                    421:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    422:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    423:         * is revised to forbid relaying case.
1.13      itojun    424:         */
                    425:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    426:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116     thorpej   427:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    428:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    429:                goto bad;
                    430:        }
                    431: #endif
1.35      itojun    432:
1.2       itojun    433:        /*
1.82      yamt      434:         * Disambiguate address scope zones (if there is ambiguity).
                    435:         * We first make sure that the original source or destination address
                    436:         * is not in our internal form for scoped addresses.  Such addresses
                    437:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    438:         * to the usage conflict.
                    439:         * in6_setscope() then also checks and rejects the cases where src or
                    440:         * dst are the loopback address and the receiving interface
                    441:         * is not loopback.
                    442:         */
1.88      bouyer    443:        if (__predict_false(
                    444:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    445:                goto bad;
                    446:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      447:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116     thorpej   448:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      449:                goto bad;
                    450:        }
                    451:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    452:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116     thorpej   453:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      454:                goto bad;
                    455:        }
                    456:
                    457:        /*
1.2       itojun    458:         * Multicast check
                    459:         */
                    460:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    461:                struct  in6_multi *in6m = 0;
1.9       itojun    462:
                    463:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    464:                /*
                    465:                 * See if we belong to the destination multicast group on the
                    466:                 * arrival interface.
                    467:                 */
                    468:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    469:                if (in6m)
                    470:                        ours = 1;
                    471:                else if (!ip6_mrouter) {
1.116     thorpej   472:                        uint64_t *ip6s = IP6_STAT_GETREF();
                    473:                        ip6s[IP6_STAT_NOTMEMBER]++;
                    474:                        ip6s[IP6_STAT_CANTFORWARD]++;
                    475:                        IP6_STAT_PUTREF();
1.9       itojun    476:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    477:                        goto bad;
                    478:                }
1.9       itojun    479:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    480:                goto hbhcheck;
                    481:        }
                    482:
1.105     dyoung    483:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    484:
1.2       itojun    485:        /*
                    486:         *  Unicast check
                    487:         */
1.105     dyoung    488:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
                    489:        if (hit)
1.116     thorpej   490:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     491:        else
1.116     thorpej   492:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    493:
1.109     dyoung    494: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2       itojun    495:
                    496:        /*
                    497:         * Accept the packet if the forwarding interface to the destination
                    498:         * according to the routing table is the loopback interface,
                    499:         * unless the associated route has a gateway.
                    500:         * Note that this approach causes to accept a packet if there is a
                    501:         * route to the loopback interface for the destination of the packet.
                    502:         * But we think it's even useful in some situations, e.g. when using
                    503:         * a special daemon which wants to intercept the packet.
                    504:         */
1.105     dyoung    505:        if (rt != NULL &&
                    506:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    507:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    508: #if 0
                    509:            /*
                    510:             * The check below is redundant since the comparison of
                    511:             * the destination and the key of the rtentry has
                    512:             * already done through looking up the routing table.
                    513:             */
1.109     dyoung    514:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2       itojun    515: #endif
1.105     dyoung    516:            rt->rt_ifp->if_type == IFT_LOOP) {
                    517:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    518:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    519:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    520:                /*
                    521:                 * packets to a tentative, duplicated, or somehow invalid
                    522:                 * address must not be accepted.
                    523:                 */
1.2       itojun    524:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    525:                        /* this address is ready */
1.2       itojun    526:                        ours = 1;
1.9       itojun    527:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    528:                        goto hbhcheck;
                    529:                } else {
1.24      itojun    530:                        /* address is not ready, so discard the packet. */
1.34      itojun    531:                        nd6log((LOG_INFO,
1.27      itojun    532:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    533:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    534:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    535:
                    536:                        goto bad;
1.2       itojun    537:                }
                    538:        }
                    539:
                    540:        /*
1.55      itojun    541:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    542:         */
                    543: #if defined(NFAITH) && 0 < NFAITH
                    544:        if (ip6_keepfaith) {
1.105     dyoung    545:                if (rt != NULL && rt->rt_ifp != NULL &&
                    546:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    547:                        /* XXX do we need more sanity checks? */
                    548:                        ours = 1;
1.105     dyoung    549:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    550:                        goto hbhcheck;
                    551:                }
                    552:        }
                    553: #endif
                    554:
                    555: #if 0
                    556:     {
                    557:        /*
                    558:         * Last resort: check in6_ifaddr for incoming interface.
                    559:         * The code is here until I update the "goto ours hack" code above
                    560:         * working right.
                    561:         */
                    562:        struct ifaddr *ifa;
1.113     dyoung    563:        IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9       itojun    564:                if (ifa->ifa_addr == NULL)
                    565:                        continue;       /* just for safety */
                    566:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    567:                        continue;
                    568:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    569:                        ours = 1;
                    570:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    571:                        goto hbhcheck;
                    572:                }
                    573:        }
1.9       itojun    574:     }
1.2       itojun    575: #endif
                    576:
                    577:        /*
                    578:         * Now there is no reason to process the packet if it's not our own
                    579:         * and we're not a router.
                    580:         */
                    581:        if (!ip6_forwarding) {
1.116     thorpej   582:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9       itojun    583:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    584:                goto bad;
                    585:        }
                    586:
                    587:   hbhcheck:
                    588:        /*
1.81      rpaulo    589:         * record address information into m_tag, if we don't have one yet.
                    590:         * note that we are unable to record it, if the address is not listed
                    591:         * as our interface address (e.g. multicast addresses, addresses
                    592:         * within FAITH prefixes and such).
                    593:         */
1.111     dyoung    594:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    595:                struct in6_ifaddr *ia6;
                    596:
                    597:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111     dyoung    598:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    599:                        /*
                    600:                         * XXX maybe we should drop the packet here,
                    601:                         * as we could not provide enough information
                    602:                         * to the upper layers.
                    603:                         */
1.81      rpaulo    604:                }
                    605:        }
                    606:
                    607:        /*
1.2       itojun    608:         * Process Hop-by-Hop options header if it's contained.
                    609:         * m may be modified in ip6_hopopts_input().
                    610:         * If a JumboPayload option is included, plen will also be modified.
                    611:         */
                    612:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    613:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    614:                struct ip6_hbh *hbh;
                    615:
                    616:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    617: #if 0  /*touches NULL pointer*/
                    618:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    619: #endif
1.2       itojun    620:                        return; /* m have already been freed */
1.9       itojun    621:                }
1.22      itojun    622:
1.2       itojun    623:                /* adjust pointer */
                    624:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    625:
                    626:                /*
1.49      itojun    627:                 * if the payload length field is 0 and the next header field
1.22      itojun    628:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    629:                 * option MUST be included.
                    630:                 */
                    631:                if (ip6->ip6_plen == 0 && plen == 0) {
                    632:                        /*
                    633:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    634:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    635:                         * (non-zero) payload length to the variable plen.
1.22      itojun    636:                         */
1.116     thorpej   637:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    638:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    639:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    640:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    641:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  642:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    643:                        return;
                    644:                }
1.9       itojun    645:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    646:                        sizeof(struct ip6_hbh));
                    647:                if (hbh == NULL) {
1.116     thorpej   648:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    649:                        return;
                    650:                }
1.57      thorpej   651:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    652:                nxt = hbh->ip6h_nxt;
1.2       itojun    653:
                    654:                /*
                    655:                 * accept the packet if a router alert option is included
                    656:                 * and we act as an IPv6 router.
                    657:                 */
1.5       itojun    658:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    659:                        ours = 1;
                    660:        } else
                    661:                nxt = ip6->ip6_nxt;
                    662:
                    663:        /*
                    664:         * Check that the amount of data in the buffers
                    665:         * is as at least much as the IPv6 header would have us expect.
                    666:         * Trim mbufs if longer than we expect.
                    667:         * Drop packet if shorter than we expect.
                    668:         */
                    669:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116     thorpej   670:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    671:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    672:                goto bad;
                    673:        }
                    674:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    675:                if (m->m_len == m->m_pkthdr.len) {
                    676:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    677:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    678:                } else
                    679:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    680:        }
                    681:
                    682:        /*
                    683:         * Forward if desirable.
                    684:         */
                    685:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    686:                /*
                    687:                 * If we are acting as a multicast router, all
                    688:                 * incoming multicast packets are passed to the
                    689:                 * kernel-level multicast forwarding function.
                    690:                 * The packet is returned (relatively) intact; if
                    691:                 * ip6_mforward() returns a non-zero value, the packet
                    692:                 * must be discarded, else it may be accepted below.
                    693:                 */
                    694:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116     thorpej   695:                        IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2       itojun    696:                        m_freem(m);
                    697:                        return;
                    698:                }
                    699:                if (!ours) {
                    700:                        m_freem(m);
                    701:                        return;
                    702:                }
1.22      itojun    703:        } else if (!ours) {
1.64      itojun    704:                ip6_forward(m, srcrt);
1.2       itojun    705:                return;
1.56      itojun    706:        }
1.25      itojun    707:
                    708:        ip6 = mtod(m, struct ip6_hdr *);
                    709:
                    710:        /*
                    711:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    712:         * tcp/udp stack and bypass security checks (act as if it was from
                    713:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    714:         *
                    715:         * For SIIT end node behavior, you may want to disable the check.
                    716:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    717:         * source.
                    718:         */
                    719:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    720:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   721:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.25      itojun    722:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    723:                goto bad;
                    724:        }
1.2       itojun    725:
                    726:        /*
                    727:         * Tell launch routine the next header
                    728:         */
1.12      itojun    729: #ifdef IFA_STATS
1.28      itojun    730:        if (deliverifp != NULL) {
1.9       itojun    731:                struct in6_ifaddr *ia6;
                    732:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    733:                if (ia6)
                    734:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    735:        }
                    736: #endif
1.116     thorpej   737:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    738:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    739:        nest = 0;
1.40      itojun    740:
1.104     yamt      741:        rh_present = 0;
1.2       itojun    742:        while (nxt != IPPROTO_DONE) {
                    743:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116     thorpej   744:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104     yamt      745:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    746:                        goto bad;
                    747:                }
1.8       itojun    748:
                    749:                /*
                    750:                 * protection against faulty packet - there should be
                    751:                 * more sanity checks in header chain processing.
                    752:                 */
                    753:                if (m->m_pkthdr.len < off) {
1.116     thorpej   754:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    755:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    756:                        goto bad;
                    757:                }
                    758:
1.104     yamt      759:                if (nxt == IPPROTO_ROUTING) {
                    760:                        if (rh_present++) {
                    761:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
                    762:                                    ifs6_in_hdrerr);
1.116     thorpej   763:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      764:                                goto bad;
                    765:                        }
                    766:                }
                    767:
1.94      degroote  768: #ifdef FAST_IPSEC
                    769:        /*
                    770:         * enforce IPsec policy checking if we are seeing last header.
                    771:         * note that we do not visit this with protocols with pcb layer
                    772:         * code - like udp/tcp/raw ip.
                    773:         */
                    774:        if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
                    775:                /*
                    776:                 * Check if the packet has already had IPsec processing
                    777:                 * done.  If so, then just pass it along.  This tag gets
                    778:                 * set during AH, ESP, etc. input handling, before the
                    779:                 * packet is returned to the ip input queue for delivery.
                    780:                 */
                    781:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    782:                s = splsoftnet();
                    783:                if (mtag != NULL) {
                    784:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    785:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    786:                } else {
                    787:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    788:                                                                        IP_FORWARDING, &error);
                    789:                }
                    790:                if (sp != NULL) {
                    791:                        /*
                    792:                         * Check security policy against packet attributes.
                    793:                         */
                    794:                        error = ipsec_in_reject(sp, m);
                    795:                        KEY_FREESP(&sp);
                    796:                } else {
                    797:                        /* XXX error stat??? */
                    798:                        error = EINVAL;
                    799:                        DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
                    800:                }
                    801:                splx(s);
                    802:                if (error)
                    803:                        goto bad;
                    804:        }
                    805: #endif /* FAST_IPSEC */
                    806:
1.56      itojun    807:
1.2       itojun    808:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    809:        }
                    810:        return;
                    811:  bad:
                    812:        m_freem(m);
                    813: }
                    814:
                    815: /*
1.81      rpaulo    816:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    817:  */
                    818: static struct m_tag *
1.112     dyoung    819: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    820: {
                    821:        struct m_tag *mtag;
                    822:
                    823:        mtag = ip6_addaux(m);
1.112     dyoung    824:        if (mtag != NULL) {
                    825:                struct ip6aux *ip6a;
                    826:
                    827:                ip6a = (struct ip6aux *)(mtag + 1);
                    828:                in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
                    829:                ip6a->ip6a_src = ia->ia_addr.sin6_addr;
                    830:                ip6a->ip6a_flags = ia->ia6_flags;
                    831:        }
1.81      rpaulo    832:        return mtag;    /* NULL if failed to set */
                    833: }
                    834:
1.112     dyoung    835: const struct ip6aux *
1.107     christos  836: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    837: {
                    838:        struct m_tag *mtag;
                    839:
                    840:        mtag = ip6_findaux(m);
1.112     dyoung    841:        if (mtag != NULL)
                    842:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    843:        else
                    844:                return NULL;
                    845: }
                    846:
                    847: /*
1.2       itojun    848:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    849:  * included, the real payload length will be stored in plenp.
1.107     christos  850:  *
                    851:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    852:  */
1.132.2.1! yamt      853: int
1.107     christos  854: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
                    855:        struct mbuf **mp, int *offp)
1.2       itojun    856: {
1.35      itojun    857:        struct mbuf *m = *mp;
1.2       itojun    858:        int off = *offp, hbhlen;
                    859:        struct ip6_hbh *hbh;
                    860:
                    861:        /* validation of the length of the header */
1.9       itojun    862:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    863:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    864:        if (hbh == NULL) {
1.116     thorpej   865:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    866:                return -1;
                    867:        }
                    868:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    869:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    870:                hbhlen);
                    871:        if (hbh == NULL) {
1.116     thorpej   872:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    873:                return -1;
                    874:        }
1.57      thorpej   875:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    876:        off += hbhlen;
                    877:        hbhlen -= sizeof(struct ip6_hbh);
                    878:
                    879:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    880:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    881:                return (-1);
1.2       itojun    882:
                    883:        *offp = off;
                    884:        *mp = m;
1.58      itojun    885:        return (0);
1.2       itojun    886: }
                    887:
                    888: /*
                    889:  * Search header for all Hop-by-hop options and process each option.
                    890:  * This function is separate from ip6_hopopts_input() in order to
                    891:  * handle a case where the sending node itself process its hop-by-hop
                    892:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    893:  *
                    894:  * The function assumes that hbh header is located right after the IPv6 header
                    895:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    896:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    897:  */
1.132.2.1! yamt      898: static int
1.107     christos  899: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
                    900:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    901: {
                    902:        struct ip6_hdr *ip6;
                    903:        int optlen = 0;
                    904:        u_int8_t *opt = opthead;
                    905:        u_int16_t rtalert_val;
1.22      itojun    906:        u_int32_t jumboplen;
1.55      itojun    907:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    908:
                    909:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    910:                switch (*opt) {
                    911:                case IP6OPT_PAD1:
                    912:                        optlen = 1;
                    913:                        break;
                    914:                case IP6OPT_PADN:
                    915:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   916:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    917:                                goto bad;
                    918:                        }
                    919:                        optlen = *(opt + 1) + 2;
                    920:                        break;
                    921:                case IP6OPT_RTALERT:
                    922:                        /* XXX may need check for alignment */
                    923:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116     thorpej   924:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    925:                                goto bad;
                    926:                        }
                    927:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    928:                                /* XXX stat */
                    929:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    930:                                    ICMP6_PARAMPROB_HEADER,
                    931:                                    erroff + opt + 1 - opthead);
                    932:                                return (-1);
1.35      itojun    933:                        }
                    934:                        optlen = IP6OPT_RTALERT_LEN;
1.126     tsutsui   935:                        memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35      itojun    936:                        *rtalertp = ntohs(rtalert_val);
                    937:                        break;
                    938:                case IP6OPT_JUMBO:
1.22      itojun    939:                        /* XXX may need check for alignment */
                    940:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116     thorpej   941:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    942:                                goto bad;
                    943:                        }
1.35      itojun    944:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    945:                                /* XXX stat */
                    946:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    947:                                    ICMP6_PARAMPROB_HEADER,
                    948:                                    erroff + opt + 1 - opthead);
                    949:                                return (-1);
1.35      itojun    950:                        }
1.22      itojun    951:                        optlen = IP6OPT_JUMBO_LEN;
                    952:
                    953:                        /*
                    954:                         * IPv6 packets that have non 0 payload length
1.35      itojun    955:                         * must not contain a jumbo payload option.
1.22      itojun    956:                         */
                    957:                        ip6 = mtod(m, struct ip6_hdr *);
                    958:                        if (ip6->ip6_plen) {
1.116     thorpej   959:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    960:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    961:                                    ICMP6_PARAMPROB_HEADER,
                    962:                                    erroff + opt - opthead);
                    963:                                return (-1);
1.22      itojun    964:                        }
1.2       itojun    965:
1.22      itojun    966:                        /*
                    967:                         * We may see jumbolen in unaligned location, so
                    968:                         * we'd need to perform bcopy().
                    969:                         */
1.126     tsutsui   970:                        memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22      itojun    971:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    972:
                    973: #if 1
                    974:                        /*
                    975:                         * if there are multiple jumbo payload options,
                    976:                         * *plenp will be non-zero and the packet will be
                    977:                         * rejected.
                    978:                         * the behavior may need some debate in ipngwg -
                    979:                         * multiple options does not make sense, however,
                    980:                         * there's no explicit mention in specification.
                    981:                         */
                    982:                        if (*plenp != 0) {
1.116     thorpej   983:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    984:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    985:                                    ICMP6_PARAMPROB_HEADER,
                    986:                                    erroff + opt + 2 - opthead);
                    987:                                return (-1);
1.22      itojun    988:                        }
1.8       itojun    989: #endif
1.2       itojun    990:
1.22      itojun    991:                        /*
                    992:                         * jumbo payload length must be larger than 65535.
                    993:                         */
                    994:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116     thorpej   995:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    996:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    997:                                    ICMP6_PARAMPROB_HEADER,
                    998:                                    erroff + opt + 2 - opthead);
                    999:                                return (-1);
1.22      itojun   1000:                        }
                   1001:                        *plenp = jumboplen;
                   1002:
                   1003:                        break;
1.35      itojun   1004:                default:                /* unknown option */
                   1005:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej  1006:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun   1007:                                goto bad;
                   1008:                        }
1.55      itojun   1009:                        optlen = ip6_unknown_opt(opt, m,
                   1010:                            erroff + opt - opthead);
                   1011:                        if (optlen == -1)
                   1012:                                return (-1);
1.35      itojun   1013:                        optlen += 2;
                   1014:                        break;
1.2       itojun   1015:                }
                   1016:        }
                   1017:
1.55      itojun   1018:        return (0);
1.2       itojun   1019:
                   1020:   bad:
                   1021:        m_freem(m);
1.55      itojun   1022:        return (-1);
1.2       itojun   1023: }
                   1024:
                   1025: /*
                   1026:  * Unknown option processing.
                   1027:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1028:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1029:  * is not continuous in order to return an ICMPv6 error.
                   1030:  */
                   1031: int
1.107     christos 1032: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun   1033: {
                   1034:        struct ip6_hdr *ip6;
                   1035:
1.35      itojun   1036:        switch (IP6OPT_TYPE(*optp)) {
                   1037:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1038:                return ((int)*(optp + 1));
1.35      itojun   1039:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1040:                m_freem(m);
1.58      itojun   1041:                return (-1);
1.35      itojun   1042:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116     thorpej  1043:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1044:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1045:                return (-1);
1.35      itojun   1046:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116     thorpej  1047:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1048:                ip6 = mtod(m, struct ip6_hdr *);
                   1049:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1050:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1051:                        m_freem(m);
                   1052:                else
                   1053:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1054:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1055:                return (-1);
1.2       itojun   1056:        }
                   1057:
                   1058:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1059:        return (-1);
1.2       itojun   1060: }
                   1061:
                   1062: /*
1.9       itojun   1063:  * Create the "control" list for this pcb.
                   1064:  *
                   1065:  * The routine will be called from upper layer handlers like tcp6_input().
                   1066:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1067:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1068:  * very first mbuf on the mbuf chain.
                   1069:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1070:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1071:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1072:  */
                   1073: void
1.107     christos 1074: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
                   1075:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1076: {
1.85      rpaulo   1077: #ifdef RFC2292
                   1078: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1079: #else
                   1080: #define IS2292(x, y)   (y)
                   1081: #endif
                   1082:
1.123     christos 1083:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP
                   1084: #ifdef SO_OTIMESTAMP
                   1085:            || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                   1086: #endif
                   1087:        ) {
1.2       itojun   1088:                struct timeval tv;
                   1089:
                   1090:                microtime(&tv);
1.123     christos 1091: #ifdef SO_OTIMESTAMP
                   1092:                if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
                   1093:                        struct timeval50 tv50;
                   1094:                        timeval_to_timeval50(&tv, &tv50);
                   1095:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1096:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1097:                } else
                   1098: #endif
1.97      christos 1099:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1100:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1101:                if (*mp)
                   1102:                        mp = &(*mp)->m_next;
                   1103:        }
1.87      rpaulo   1104:
                   1105:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1106:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1107:                return;
                   1108:
1.2       itojun   1109:        /* RFC 2292 sec. 5 */
1.35      itojun   1110:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1111:                struct in6_pktinfo pi6;
1.85      rpaulo   1112:
1.126     tsutsui  1113:                memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81      rpaulo   1114:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1115:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1116:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1117:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1118:                    sizeof(struct in6_pktinfo),
                   1119:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1120:                if (*mp)
                   1121:                        mp = &(*mp)->m_next;
                   1122:        }
1.85      rpaulo   1123:
1.2       itojun   1124:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1125:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1126:
1.97      christos 1127:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1128:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1129:                if (*mp)
                   1130:                        mp = &(*mp)->m_next;
                   1131:        }
                   1132:
                   1133:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1134:                u_int32_t flowinfo;
                   1135:                int tclass;
                   1136:
                   1137:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1138:                flowinfo >>= 20;
                   1139:
                   1140:                tclass = flowinfo & 0xff;
1.97      christos 1141:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1142:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1143:
1.2       itojun   1144:                if (*mp)
                   1145:                        mp = &(*mp)->m_next;
                   1146:        }
                   1147:
                   1148:        /*
1.75      itojun   1149:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1150:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1151:         * strict, since there might be some hop-by-hop options which can be
                   1152:         * returned to normal user.
1.85      rpaulo   1153:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1154:         */
1.75      itojun   1155:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1156:                /*
                   1157:                 * Check if a hop-by-hop options header is contatined in the
                   1158:                 * received packet, and if so, store the options as ancillary
                   1159:                 * data. Note that a hop-by-hop options header must be
                   1160:                 * just after the IPv6 header, which fact is assured through
                   1161:                 * the IPv6 input processing.
                   1162:                 */
1.78      christos 1163:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1164:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1165:                        struct ip6_hbh *hbh;
                   1166:                        int hbhlen;
1.62      itojun   1167:                        struct mbuf *ext;
1.9       itojun   1168:
1.62      itojun   1169:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1170:                            xip6->ip6_nxt);
1.62      itojun   1171:                        if (ext == NULL) {
1.116     thorpej  1172:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1173:                                return;
                   1174:                        }
1.62      itojun   1175:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1176:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1177:                        if (hbhlen != ext->m_len) {
                   1178:                                m_freem(ext);
1.116     thorpej  1179:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1180:                                return;
                   1181:                        }
1.2       itojun   1182:
                   1183:                        /*
                   1184:                         * XXX: We copy whole the header even if a jumbo
                   1185:                         * payload option is included, which option is to
                   1186:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1187:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1188:                         */
1.97      christos 1189:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1190:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1191:                            IPPROTO_IPV6);
1.2       itojun   1192:                        if (*mp)
                   1193:                                mp = &(*mp)->m_next;
1.62      itojun   1194:                        m_freem(ext);
1.2       itojun   1195:                }
                   1196:        }
                   1197:
                   1198:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1199:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1200:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1201:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1202:
                   1203:                /*
                   1204:                 * Search for destination options headers or routing
                   1205:                 * header(s) through the header chain, and stores each
                   1206:                 * header as ancillary data.
                   1207:                 * Note that the order of the headers remains in
                   1208:                 * the chain of ancillary data.
                   1209:                 */
1.86      rpaulo   1210:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1211:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1212:                        int elen;
1.62      itojun   1213:                        struct mbuf *ext = NULL;
1.9       itojun   1214:
1.62      itojun   1215:                        /*
                   1216:                         * if it is not an extension header, don't try to
                   1217:                         * pull it from the chain.
                   1218:                         */
                   1219:                        switch (nxt) {
                   1220:                        case IPPROTO_DSTOPTS:
                   1221:                        case IPPROTO_ROUTING:
                   1222:                        case IPPROTO_HOPOPTS:
                   1223:                        case IPPROTO_AH: /* is it possible? */
                   1224:                                break;
                   1225:                        default:
                   1226:                                goto loopend;
                   1227:                        }
                   1228:
                   1229:                        ext = ip6_pullexthdr(m, off, nxt);
                   1230:                        if (ext == NULL) {
1.116     thorpej  1231:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1232:                                return;
                   1233:                        }
1.62      itojun   1234:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1235:                        if (nxt == IPPROTO_AH)
                   1236:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1237:                        else
                   1238:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1239:                        if (elen != ext->m_len) {
                   1240:                                m_freem(ext);
1.116     thorpej  1241:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1242:                                return;
                   1243:                        }
1.57      thorpej  1244:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1245:
1.35      itojun   1246:                        switch (nxt) {
1.62      itojun   1247:                        case IPPROTO_DSTOPTS:
1.127     martin   1248:                                if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35      itojun   1249:                                        break;
                   1250:
1.97      christos 1251:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1252:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1253:                                    IPPROTO_IPV6);
1.35      itojun   1254:                                if (*mp)
                   1255:                                        mp = &(*mp)->m_next;
                   1256:                                break;
                   1257:
                   1258:                        case IPPROTO_ROUTING:
1.127     martin   1259:                                if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35      itojun   1260:                                        break;
                   1261:
1.97      christos 1262:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1263:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1264:                                    IPPROTO_IPV6);
1.35      itojun   1265:                                if (*mp)
                   1266:                                        mp = &(*mp)->m_next;
                   1267:                                break;
                   1268:
1.62      itojun   1269:                        case IPPROTO_HOPOPTS:
                   1270:                        case IPPROTO_AH: /* is it possible? */
                   1271:                                break;
                   1272:
1.35      itojun   1273:                        default:
                   1274:                                /*
1.62      itojun   1275:                                 * other cases have been filtered in the above.
                   1276:                                 * none will visit this case.  here we supply
                   1277:                                 * the code just in case (nxt overwritten or
                   1278:                                 * other cases).
1.35      itojun   1279:                                 */
1.62      itojun   1280:                                m_freem(ext);
1.35      itojun   1281:                                goto loopend;
                   1282:
1.2       itojun   1283:                        }
                   1284:
                   1285:                        /* proceed with the next header. */
1.9       itojun   1286:                        off += elen;
1.2       itojun   1287:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1288:                        ip6e = NULL;
                   1289:                        m_freem(ext);
                   1290:                        ext = NULL;
1.2       itojun   1291:                }
                   1292:          loopend:
1.62      itojun   1293:                ;
1.2       itojun   1294:        }
1.62      itojun   1295: }
1.85      rpaulo   1296: #undef IS2292
                   1297:
                   1298:
                   1299: void
1.95      dyoung   1300: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1301:     uint32_t *mtu)
1.85      rpaulo   1302: {
                   1303:        struct socket *so;
                   1304:        struct mbuf *m_mtu;
                   1305:        struct ip6_mtuinfo mtuctl;
                   1306:
                   1307:        so = in6p->in6p_socket;
                   1308:
                   1309:        if (mtu == NULL)
                   1310:                return;
                   1311:
                   1312: #ifdef DIAGNOSTIC
                   1313:        if (so == NULL)         /* I believe this is impossible */
                   1314:                panic("ip6_notify_pmtu: socket is NULL");
                   1315: #endif
                   1316:
                   1317:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1318:        mtuctl.ip6m_mtu = *mtu;
                   1319:        mtuctl.ip6m_addr = *dst;
                   1320:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1321:                return;
                   1322:
1.97      christos 1323:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1324:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1325:                return;
                   1326:
1.95      dyoung   1327:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1328:            == 0) {
                   1329:                m_freem(m_mtu);
                   1330:                /* XXX: should count statistics */
                   1331:        } else
                   1332:                sorwakeup(so);
                   1333:
                   1334:        return;
                   1335: }
1.62      itojun   1336:
                   1337: /*
                   1338:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1339:  * contains the result, or NULL on error.
                   1340:  */
                   1341: static struct mbuf *
1.107     christos 1342: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1343: {
                   1344:        struct ip6_ext ip6e;
                   1345:        size_t elen;
                   1346:        struct mbuf *n;
                   1347:
                   1348: #ifdef DIAGNOSTIC
                   1349:        switch (nxt) {
                   1350:        case IPPROTO_DSTOPTS:
                   1351:        case IPPROTO_ROUTING:
                   1352:        case IPPROTO_HOPOPTS:
                   1353:        case IPPROTO_AH: /* is it possible? */
                   1354:                break;
                   1355:        default:
                   1356:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1357:        }
1.62      itojun   1358: #endif
1.2       itojun   1359:
1.97      christos 1360:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1361:        if (nxt == IPPROTO_AH)
                   1362:                elen = (ip6e.ip6e_len + 2) << 2;
                   1363:        else
                   1364:                elen = (ip6e.ip6e_len + 1) << 3;
                   1365:
                   1366:        MGET(n, M_DONTWAIT, MT_DATA);
                   1367:        if (n && elen >= MLEN) {
                   1368:                MCLGET(n, M_DONTWAIT);
                   1369:                if ((n->m_flags & M_EXT) == 0) {
                   1370:                        m_free(n);
                   1371:                        n = NULL;
                   1372:                }
                   1373:        }
                   1374:        if (!n)
                   1375:                return NULL;
                   1376:
                   1377:        n->m_len = 0;
                   1378:        if (elen >= M_TRAILINGSPACE(n)) {
                   1379:                m_free(n);
                   1380:                return NULL;
                   1381:        }
                   1382:
1.97      christos 1383:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1384:        n->m_len = elen;
                   1385:        return n;
1.2       itojun   1386: }
                   1387:
                   1388: /*
                   1389:  * Get pointer to the previous header followed by the header
                   1390:  * currently processed.
                   1391:  * XXX: This function supposes that
                   1392:  *     M includes all headers,
                   1393:  *     the next header field and the header length field of each header
                   1394:  *     are valid, and
                   1395:  *     the sum of each header length equals to OFF.
                   1396:  * Because of these assumptions, this function must be called very
                   1397:  * carefully. Moreover, it will not be used in the near future when
                   1398:  * we develop `neater' mechanism to process extension headers.
                   1399:  */
1.58      itojun   1400: u_int8_t *
1.107     christos 1401: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1402: {
                   1403:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1404:
                   1405:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1406:                return (&ip6->ip6_nxt);
1.2       itojun   1407:        else {
                   1408:                int len, nxt;
                   1409:                struct ip6_ext *ip6e = NULL;
                   1410:
                   1411:                nxt = ip6->ip6_nxt;
                   1412:                len = sizeof(struct ip6_hdr);
                   1413:                while (len < off) {
1.97      christos 1414:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1415:
1.35      itojun   1416:                        switch (nxt) {
1.2       itojun   1417:                        case IPPROTO_FRAGMENT:
                   1418:                                len += sizeof(struct ip6_frag);
                   1419:                                break;
                   1420:                        case IPPROTO_AH:
                   1421:                                len += (ip6e->ip6e_len + 2) << 2;
                   1422:                                break;
                   1423:                        default:
                   1424:                                len += (ip6e->ip6e_len + 1) << 3;
                   1425:                                break;
                   1426:                        }
                   1427:                        nxt = ip6e->ip6e_nxt;
                   1428:                }
                   1429:                if (ip6e)
1.58      itojun   1430:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1431:                else
                   1432:                        return NULL;
1.18      itojun   1433:        }
                   1434: }
                   1435:
                   1436: /*
                   1437:  * get next header offset.  m will be retained.
                   1438:  */
                   1439: int
1.107     christos 1440: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1441: {
                   1442:        struct ip6_hdr ip6;
                   1443:        struct ip6_ext ip6e;
                   1444:        struct ip6_frag fh;
                   1445:
                   1446:        /* just in case */
                   1447:        if (m == NULL)
                   1448:                panic("ip6_nexthdr: m == NULL");
                   1449:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1450:                return -1;
                   1451:
                   1452:        switch (proto) {
                   1453:        case IPPROTO_IPV6:
1.83      rpaulo   1454:                /* do not chase beyond intermediate IPv6 headers */
                   1455:                if (off != 0)
                   1456:                        return -1;
1.18      itojun   1457:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1458:                        return -1;
1.97      christos 1459:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1460:                if (nxtp)
                   1461:                        *nxtp = ip6.ip6_nxt;
                   1462:                off += sizeof(ip6);
                   1463:                return off;
                   1464:
                   1465:        case IPPROTO_FRAGMENT:
                   1466:                /*
                   1467:                 * terminate parsing if it is not the first fragment,
                   1468:                 * it does not make sense to parse through it.
                   1469:                 */
                   1470:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1471:                        return -1;
1.97      christos 1472:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1473:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1474:                        return -1;
                   1475:                if (nxtp)
                   1476:                        *nxtp = fh.ip6f_nxt;
                   1477:                off += sizeof(struct ip6_frag);
                   1478:                return off;
                   1479:
                   1480:        case IPPROTO_AH:
                   1481:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1482:                        return -1;
1.97      christos 1483:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1484:                if (nxtp)
                   1485:                        *nxtp = ip6e.ip6e_nxt;
                   1486:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1487:                if (m->m_pkthdr.len < off)
                   1488:                        return -1;
1.18      itojun   1489:                return off;
                   1490:
                   1491:        case IPPROTO_HOPOPTS:
                   1492:        case IPPROTO_ROUTING:
                   1493:        case IPPROTO_DSTOPTS:
                   1494:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1495:                        return -1;
1.97      christos 1496:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1497:                if (nxtp)
                   1498:                        *nxtp = ip6e.ip6e_nxt;
                   1499:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1500:                if (m->m_pkthdr.len < off)
                   1501:                        return -1;
1.18      itojun   1502:                return off;
                   1503:
                   1504:        case IPPROTO_NONE:
                   1505:        case IPPROTO_ESP:
                   1506:        case IPPROTO_IPCOMP:
                   1507:                /* give up */
                   1508:                return -1;
                   1509:
                   1510:        default:
                   1511:                return -1;
                   1512:        }
                   1513: }
                   1514:
                   1515: /*
                   1516:  * get offset for the last header in the chain.  m will be kept untainted.
                   1517:  */
                   1518: int
1.107     christos 1519: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1520: {
                   1521:        int newoff;
                   1522:        int nxt;
                   1523:
                   1524:        if (!nxtp) {
                   1525:                nxt = -1;
                   1526:                nxtp = &nxt;
                   1527:        }
1.86      rpaulo   1528:        for (;;) {
1.18      itojun   1529:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1530:                if (newoff < 0)
                   1531:                        return off;
                   1532:                else if (newoff < off)
                   1533:                        return -1;      /* invalid */
                   1534:                else if (newoff == off)
                   1535:                        return newoff;
                   1536:
                   1537:                off = newoff;
                   1538:                proto = *nxtp;
1.2       itojun   1539:        }
                   1540: }
                   1541:
1.81      rpaulo   1542: struct m_tag *
1.107     christos 1543: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1544: {
                   1545:        struct m_tag *mtag;
                   1546:
                   1547:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1548:        if (!mtag) {
                   1549:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1550:                    M_NOWAIT);
                   1551:                if (mtag) {
                   1552:                        m_tag_prepend(m, mtag);
1.124     cegger   1553:                        memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81      rpaulo   1554:                }
                   1555:        }
                   1556:        return mtag;
                   1557: }
                   1558:
                   1559: struct m_tag *
1.107     christos 1560: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1561: {
                   1562:        struct m_tag *mtag;
                   1563:
                   1564:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1565:        return mtag;
                   1566: }
                   1567:
                   1568: void
1.107     christos 1569: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1570: {
                   1571:        struct m_tag *mtag;
                   1572:
                   1573:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1574:        if (mtag)
                   1575:                m_tag_delete(m, mtag);
                   1576: }
                   1577:
1.98      liamjfoy 1578: #ifdef GATEWAY
                   1579: /*
                   1580:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1581:  * we could reduce this value, call ip6flow_reap();
                   1582:  */
                   1583: static int
1.101     liamjfoy 1584: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98      liamjfoy 1585: {
1.121     simonb   1586:        int error;
1.98      liamjfoy 1587:
1.121     simonb   1588:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1589:        if (error || newp == NULL)
                   1590:                return (error);
1.98      liamjfoy 1591:
1.121     simonb   1592:        mutex_enter(softnet_lock);
1.122     matt     1593:        KERNEL_LOCK(1, NULL);
1.120     matt     1594:
1.121     simonb   1595:        ip6flow_reap(0);
1.120     matt     1596:
                   1597:        KERNEL_UNLOCK_ONE(NULL);
1.121     simonb   1598:        mutex_exit(softnet_lock);
1.98      liamjfoy 1599:
1.121     simonb   1600:        return (0);
1.98      liamjfoy 1601: }
1.99      liamjfoy 1602:
                   1603: static int
                   1604: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1605: {
                   1606:        int error, tmp;
                   1607:        struct sysctlnode node;
                   1608:
                   1609:        node = *rnode;
                   1610:        tmp = ip6_hashsize;
                   1611:        node.sysctl_data = &tmp;
                   1612:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1613:        if (error || newp == NULL)
                   1614:                return (error);
                   1615:
                   1616:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1617:                /*
                   1618:                 * Can only fail due to malloc()
                   1619:                 */
1.120     matt     1620:                mutex_enter(softnet_lock);
1.122     matt     1621:                KERNEL_LOCK(1, NULL);
1.120     matt     1622:
                   1623:                error = ip6flow_invalidate_all(tmp);
                   1624:
                   1625:                KERNEL_UNLOCK_ONE(NULL);
                   1626:                mutex_exit(softnet_lock);
1.99      liamjfoy 1627:        } else {
                   1628:                /*
                   1629:                 * EINVAL if not a power of 2
1.121     simonb   1630:                 */
1.120     matt     1631:                error = EINVAL;
1.99      liamjfoy 1632:        }
                   1633:
1.120     matt     1634:        return error;
1.99      liamjfoy 1635: }
1.98      liamjfoy 1636: #endif /* GATEWAY */
                   1637:
1.2       itojun   1638: /*
                   1639:  * System control for IP6
                   1640:  */
                   1641:
1.120     matt     1642: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2       itojun   1643:        0,              0,              0,              0,
                   1644:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1645:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1646:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1647:        0,              0,              0,              0,
                   1648:        ENOPROTOOPT
                   1649: };
                   1650:
1.116     thorpej  1651: static int
                   1652: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
                   1653: {
                   1654:
1.119     thorpej  1655:        return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116     thorpej  1656: }
                   1657:
1.128     pooka    1658: static void
                   1659: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2       itojun   1660: {
1.85      rpaulo   1661: #ifdef RFC2292
                   1662: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1663: #else
                   1664: #define IS2292(x, y)   (y)
                   1665: #endif
1.26      itojun   1666:
1.73      atatat   1667:        sysctl_createv(clog, 0, NULL, NULL,
                   1668:                       CTLFLAG_PERMANENT,
1.70      atatat   1669:                       CTLTYPE_NODE, "net", NULL,
                   1670:                       NULL, 0, NULL, 0,
                   1671:                       CTL_NET, CTL_EOL);
1.73      atatat   1672:        sysctl_createv(clog, 0, NULL, NULL,
                   1673:                       CTLFLAG_PERMANENT,
1.74      atatat   1674:                       CTLTYPE_NODE, "inet6",
                   1675:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1676:                       NULL, 0, NULL, 0,
                   1677:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1678:        sysctl_createv(clog, 0, NULL, NULL,
                   1679:                       CTLFLAG_PERMANENT,
1.74      atatat   1680:                       CTLTYPE_NODE, "ip6",
                   1681:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1682:                       NULL, 0, NULL, 0,
                   1683:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1684:
1.73      atatat   1685:        sysctl_createv(clog, 0, NULL, NULL,
                   1686:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1687:                       CTLTYPE_INT, "forwarding",
                   1688:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1689:                       NULL, 0, &ip6_forwarding, 0,
                   1690:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1691:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1692:        sysctl_createv(clog, 0, NULL, NULL,
                   1693:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1694:                       CTLTYPE_INT, "redirect",
                   1695:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1696:                       NULL, 0, &ip6_sendredirects, 0,
                   1697:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1698:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1699:        sysctl_createv(clog, 0, NULL, NULL,
                   1700:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1701:                       CTLTYPE_INT, "hlim",
                   1702:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1703:                       NULL, 0, &ip6_defhlim, 0,
                   1704:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1705:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1706: #ifdef notyet
1.73      atatat   1707:        sysctl_createv(clog, 0, NULL, NULL,
                   1708:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1709:                       CTLTYPE_INT, "mtu", NULL,
                   1710:                       NULL, 0, &, 0,
                   1711:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1712:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1713: #endif
                   1714: #ifdef __no_idea__
1.73      atatat   1715:        sysctl_createv(clog, 0, NULL, NULL,
                   1716:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1717:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1718:                       NULL, 0, &?, 0,
                   1719:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1720:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1721:        sysctl_createv(clog, 0, NULL, NULL,
                   1722:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1723:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1724:                       NULL, 0, &?, sizeof(?),
                   1725:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1726:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1727:        sysctl_createv(clog, 0, NULL, NULL,
                   1728:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1729:                       CTLTYPE_?, "mrtproto", NULL,
                   1730:                       NULL, 0, &?, sizeof(?),
                   1731:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1732:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1733: #endif
1.73      atatat   1734:        sysctl_createv(clog, 0, NULL, NULL,
                   1735:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1736:                       CTLTYPE_INT, "maxfragpackets",
                   1737:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1738:                                    "for reassembly"),
1.70      atatat   1739:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1740:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1741:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1742: #ifdef __no_idea__
1.73      atatat   1743:        sysctl_createv(clog, 0, NULL, NULL,
                   1744:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1745:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1746:                       NULL, 0, &?, 0,
                   1747:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1748:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1749:        sysctl_createv(clog, 0, NULL, NULL,
                   1750:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1751:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1752:                       NULL, 0, &?, 0,
                   1753:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1754:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1755: #endif
1.73      atatat   1756:        sysctl_createv(clog, 0, NULL, NULL,
                   1757:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1758:                       CTLTYPE_INT, "accept_rtadv",
                   1759:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1760:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1761:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1762:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1763:        sysctl_createv(clog, 0, NULL, NULL,
                   1764:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.131     spz      1765:                       CTLTYPE_INT, "rtadv_maxroutes",
                   1766:                       SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"),
                   1767:                       NULL, 0, &ip6_rtadv_maxroutes, 0,
                   1768:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1769:                       IPV6CTL_RTADV_MAXROUTES, CTL_EOL);
                   1770:        sysctl_createv(clog, 0, NULL, NULL,
                   1771:                       CTLFLAG_PERMANENT,
                   1772:                       CTLTYPE_INT, "rtadv_numroutes",
                   1773:                       SYSCTL_DESCR("Current number of routes accepted via router advertisements"),
                   1774:                       NULL, 0, &nd6_numroutes, 0,
                   1775:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1776:                       IPV6CTL_RTADV_NUMROUTES, CTL_EOL);
                   1777:        sysctl_createv(clog, 0, NULL, NULL,
                   1778:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1779:                       CTLTYPE_INT, "keepfaith",
                   1780:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1781:                       NULL, 0, &ip6_keepfaith, 0,
                   1782:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1783:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1784:        sysctl_createv(clog, 0, NULL, NULL,
                   1785:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1786:                       CTLTYPE_INT, "log_interval",
                   1787:                       SYSCTL_DESCR("Minumum interval between logging "
                   1788:                                    "unroutable packets"),
1.70      atatat   1789:                       NULL, 0, &ip6_log_interval, 0,
                   1790:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1791:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1792:        sysctl_createv(clog, 0, NULL, NULL,
                   1793:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1794:                       CTLTYPE_INT, "hdrnestlimit",
                   1795:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1796:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1797:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1798:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1799:        sysctl_createv(clog, 0, NULL, NULL,
                   1800:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1801:                       CTLTYPE_INT, "dad_count",
                   1802:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1803:                                    "probes to send"),
1.70      atatat   1804:                       NULL, 0, &ip6_dad_count, 0,
                   1805:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1806:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1807:        sysctl_createv(clog, 0, NULL, NULL,
                   1808:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1809:                       CTLTYPE_INT, "auto_flowlabel",
                   1810:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1811:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1812:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1813:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1814:        sysctl_createv(clog, 0, NULL, NULL,
                   1815:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1816:                       CTLTYPE_INT, "defmcasthlim",
                   1817:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1818:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1819:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1820:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1821: #if NGIF > 0
1.73      atatat   1822:        sysctl_createv(clog, 0, NULL, NULL,
                   1823:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1824:                       CTLTYPE_INT, "gifhlim",
                   1825:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1826:                       NULL, 0, &ip6_gif_hlim, 0,
                   1827:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1828:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1829: #endif /* NGIF */
1.73      atatat   1830:        sysctl_createv(clog, 0, NULL, NULL,
                   1831:                       CTLFLAG_PERMANENT,
1.74      atatat   1832:                       CTLTYPE_STRING, "kame_version",
                   1833:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1834:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1835:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1836:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1837:        sysctl_createv(clog, 0, NULL, NULL,
                   1838:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1839:                       CTLTYPE_INT, "use_deprecated",
                   1840:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1841:                                    "source addresses"),
1.70      atatat   1842:                       NULL, 0, &ip6_use_deprecated, 0,
                   1843:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1844:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1845:        sysctl_createv(clog, 0, NULL, NULL,
                   1846:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1847:                       CTLTYPE_INT, "rr_prune", NULL,
                   1848:                       NULL, 0, &ip6_rr_prune, 0,
                   1849:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1850:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1851:        sysctl_createv(clog, 0, NULL, NULL,
                   1852:                       CTLFLAG_PERMANENT
1.70      atatat   1853: #ifndef INET6_BINDV6ONLY
1.73      atatat   1854:                       |CTLFLAG_READWRITE,
1.70      atatat   1855: #endif
1.74      atatat   1856:                       CTLTYPE_INT, "v6only",
                   1857:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1858:                                    "to PF_INET sockets"),
1.70      atatat   1859:                       NULL, 0, &ip6_v6only, 0,
                   1860:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1861:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1862:        sysctl_createv(clog, 0, NULL, NULL,
                   1863:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1864:                       CTLTYPE_INT, "anonportmin",
                   1865:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1866:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1867:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1868:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1869:        sysctl_createv(clog, 0, NULL, NULL,
                   1870:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1871:                       CTLTYPE_INT, "anonportmax",
                   1872:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1873:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1874:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1875:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1876: #ifndef IPNOPRIVPORTS
1.73      atatat   1877:        sysctl_createv(clog, 0, NULL, NULL,
                   1878:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1879:                       CTLTYPE_INT, "lowportmin",
                   1880:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1881:                                    "to assign"),
1.70      atatat   1882:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1883:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1884:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1885:        sysctl_createv(clog, 0, NULL, NULL,
                   1886:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1887:                       CTLTYPE_INT, "lowportmax",
                   1888:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1889:                                    "to assign"),
1.70      atatat   1890:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1891:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1892:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1893: #endif /* IPNOPRIVPORTS */
1.73      atatat   1894:        sysctl_createv(clog, 0, NULL, NULL,
                   1895:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1896:                       CTLTYPE_INT, "use_tempaddr",
                   1897:                       SYSCTL_DESCR("Use temporary address"),
                   1898:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1899:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1900:                       CTL_CREATE, CTL_EOL);
                   1901:        sysctl_createv(clog, 0, NULL, NULL,
                   1902:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1903:                       CTLTYPE_INT, "temppltime",
                   1904:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1905:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1906:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1907:                       CTL_CREATE, CTL_EOL);
                   1908:        sysctl_createv(clog, 0, NULL, NULL,
                   1909:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1910:                       CTLTYPE_INT, "tempvltime",
                   1911:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1912:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1913:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1914:                       CTL_CREATE, CTL_EOL);
                   1915:        sysctl_createv(clog, 0, NULL, NULL,
                   1916:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1917:                       CTLTYPE_INT, "maxfrags",
                   1918:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1919:                       NULL, 0, &ip6_maxfrags, 0,
                   1920:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1921:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1922:        sysctl_createv(clog, 0, NULL, NULL,
                   1923:                       CTLFLAG_PERMANENT,
                   1924:                       CTLTYPE_STRUCT, "stats",
                   1925:                       SYSCTL_DESCR("IPv6 statistics"),
1.116     thorpej  1926:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1927:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1928:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1929:        sysctl_createv(clog, 0, NULL, NULL,
                   1930:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1931:                       CTLTYPE_INT, "use_defaultzone",
                   1932:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1933:                       NULL, 0, &ip6_use_defzone, 0,
                   1934:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1935:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1936:        sysctl_createv(clog, 0, NULL, NULL,
                   1937:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1938:                       CTLTYPE_INT, "mcast_pmtu",
                   1939:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1940:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1941:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1942:                       CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1943: #ifdef GATEWAY
                   1944:        sysctl_createv(clog, 0, NULL, NULL,
                   1945:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1946:                        CTLTYPE_INT, "maxflows",
                   1947:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1948:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1949:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1950:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1951:        sysctl_createv(clog, 0, NULL, NULL,
                   1952:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1953:                        CTLTYPE_INT, "hashsize",
                   1954:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1955:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1956:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1957:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1958: #endif
1.2       itojun   1959: }
1.116     thorpej  1960:
                   1961: void
                   1962: ip6_statinc(u_int stat)
                   1963: {
                   1964:
                   1965:        KASSERT(stat < IP6_NSTATS);
                   1966:        IP6_STATINC(stat);
                   1967: }

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