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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.128

1.128   ! pooka       1: /*     $NetBSD: ip6_input.c,v 1.127 2009/05/01 03:23:39 martin 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>
1.128   ! pooka      65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.127 2009/05/01 03:23:39 martin Exp $");
1.2       itojun     66:
                     67: #include "opt_inet.h"
1.85      rpaulo     68: #include "opt_inet6.h"
1.4       thorpej    69: #include "opt_ipsec.h"
1.15      darrenr    70: #include "opt_pfil_hooks.h"
1.123     christos   71: #include "opt_compat_netbsd.h"
1.2       itojun     72:
                     73: #include <sys/param.h>
                     74: #include <sys/systm.h>
                     75: #include <sys/malloc.h>
                     76: #include <sys/mbuf.h>
                     77: #include <sys/domain.h>
                     78: #include <sys/protosw.h>
                     79: #include <sys/socket.h>
                     80: #include <sys/socketvar.h>
                     81: #include <sys/errno.h>
                     82: #include <sys/time.h>
                     83: #include <sys/kernel.h>
                     84: #include <sys/syslog.h>
                     85: #include <sys/proc.h>
1.46      simonb     86: #include <sys/sysctl.h>
1.2       itojun     87:
                     88: #include <net/if.h>
                     89: #include <net/if_types.h>
                     90: #include <net/if_dl.h>
                     91: #include <net/route.h>
                     92: #include <net/netisr.h>
1.15      darrenr    93: #ifdef PFIL_HOOKS
                     94: #include <net/pfil.h>
                     95: #endif
1.2       itojun     96:
                     97: #include <netinet/in.h>
1.9       itojun     98: #include <netinet/in_systm.h>
                     99: #ifdef INET
                    100: #include <netinet/ip.h>
                    101: #include <netinet/ip_icmp.h>
1.45      itojun    102: #endif /* INET */
1.14      itojun    103: #include <netinet/ip6.h>
1.2       itojun    104: #include <netinet6/in6_var.h>
1.11      itojun    105: #include <netinet6/ip6_var.h>
1.116     thorpej   106: #include <netinet6/ip6_private.h>
1.2       itojun    107: #include <netinet6/in6_pcb.h>
1.14      itojun    108: #include <netinet/icmp6.h>
1.81      rpaulo    109: #include <netinet6/scope6_var.h>
1.2       itojun    110: #include <netinet6/in6_ifattach.h>
                    111: #include <netinet6/nd6.h>
                    112:
1.37      itojun    113: #ifdef IPSEC
                    114: #include <netinet6/ipsec.h>
1.117     thorpej   115: #include <netinet6/ipsec_private.h>
1.37      itojun    116: #endif
                    117:
1.94      degroote  118: #ifdef FAST_IPSEC
                    119: #include <netipsec/ipsec.h>
                    120: #include <netipsec/ipsec6.h>
                    121: #include <netipsec/key.h>
                    122: #endif /* FAST_IPSEC */
                    123:
1.123     christos  124: #ifdef COMPAT_50
                    125: #include <compat/sys/time.h>
                    126: #include <compat/sys/socket.h>
                    127: #endif
                    128:
1.2       itojun    129: #include <netinet6/ip6protosw.h>
                    130:
                    131: #include "faith.h"
                    132: #include "gif.h"
1.50      itojun    133:
                    134: #if NGIF > 0
                    135: #include <netinet6/in6_gif.h>
                    136: #endif
1.2       itojun    137:
1.9       itojun    138: #include <net/net_osdep.h>
                    139:
1.2       itojun    140: extern struct domain inet6domain;
                    141:
                    142: u_char ip6_protox[IPPROTO_MAX];
                    143: static int ip6qmaxlen = IFQ_MAXLEN;
                    144: struct in6_ifaddr *in6_ifaddr;
                    145: struct ifqueue ip6intrq;
                    146:
1.108     ad        147: extern callout_t in6_tmpaddrtimer_ch;
1.83      rpaulo    148:
1.2       itojun    149: int ip6_forward_srcrt;                 /* XXX */
                    150: int ip6_sourcecheck;                   /* XXX */
                    151: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    152:
1.29      thorpej   153: #ifdef PFIL_HOOKS
                    154: struct pfil_head inet6_pfil_hook;
                    155: #endif
                    156:
1.116     thorpej   157: percpu_t *ip6stat_percpu;
1.2       itojun    158:
1.111     dyoung    159: static void ip6_init2(void *);
1.112     dyoung    160: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    161:
1.111     dyoung    162: static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
                    163: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128   ! pooka     164: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2       itojun    165:
                    166: /*
                    167:  * IP6 initialization: fill in IP6 protocol switch table.
                    168:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    169:  */
                    170: void
1.114     matt      171: ip6_init(void)
1.2       itojun    172: {
1.78      christos  173:        const struct ip6protosw *pr;
1.35      itojun    174:        int i;
1.2       itojun    175:
1.128   ! pooka     176:        sysctl_net_inet6_ip6_setup(NULL);
1.78      christos  177:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    178:        if (pr == 0)
                    179:                panic("ip6_init");
                    180:        for (i = 0; i < IPPROTO_MAX; i++)
                    181:                ip6_protox[i] = pr - inet6sw;
1.78      christos  182:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    183:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    184:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    185:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    186:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    187:        ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81      rpaulo    188:        scope6_init();
                    189:        addrsel_policy_init();
1.2       itojun    190:        nd6_init();
                    191:        frag6_init();
1.83      rpaulo    192:        ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    193:
                    194:        ip6_init2((void *)0);
1.98      liamjfoy  195: #ifdef GATEWAY
1.99      liamjfoy  196:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  197: #endif
1.29      thorpej   198:
                    199: #ifdef PFIL_HOOKS
                    200:        /* Register our Packet Filter hook. */
1.33      thorpej   201:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    202:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   203:        i = pfil_head_register(&inet6_pfil_hook);
                    204:        if (i != 0)
                    205:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    206:                    "error %d\n", i);
                    207: #endif /* PFIL_HOOKS */
1.116     thorpej   208:
                    209:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2       itojun    210: }
                    211:
                    212: static void
1.90      christos  213: ip6_init2(void *dummy)
1.2       itojun    214: {
                    215:
                    216:        /* nd6_timer_init */
1.118     ad        217:        callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19      thorpej   218:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    219:
                    220:        /* timer for regeneranation of temporary addresses randomize ID */
1.118     ad        221:        callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83      rpaulo    222:        callout_reset(&in6_tmpaddrtimer_ch,
                    223:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    224:                       ip6_temp_regen_advance) * hz,
                    225:                      in6_tmpaddrtimer, NULL);
1.2       itojun    226: }
                    227:
                    228: /*
                    229:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    230:  */
                    231: void
1.114     matt      232: ip6intr(void)
1.2       itojun    233: {
                    234:        int s;
                    235:        struct mbuf *m;
                    236:
1.118     ad        237:        mutex_enter(softnet_lock);
                    238:        KERNEL_LOCK(1, NULL);
1.2       itojun    239:        for (;;) {
1.41      thorpej   240:                s = splnet();
1.2       itojun    241:                IF_DEQUEUE(&ip6intrq, m);
                    242:                splx(s);
                    243:                if (m == 0)
1.118     ad        244:                        break;
1.83      rpaulo    245:                /* drop the packet if IPv6 operation is disabled on the IF */
                    246:                if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    247:                        m_freem(m);
1.118     ad        248:                        break;
1.83      rpaulo    249:                }
1.2       itojun    250:                ip6_input(m);
                    251:        }
1.118     ad        252:        KERNEL_UNLOCK_ONE(NULL);
                    253:        mutex_exit(softnet_lock);
1.2       itojun    254: }
                    255:
1.103     dyoung    256: extern struct  route ip6_forward_rt;
1.2       itojun    257:
                    258: void
1.96      dyoung    259: ip6_input(struct mbuf *m)
1.2       itojun    260: {
1.9       itojun    261:        struct ip6_hdr *ip6;
1.105     dyoung    262:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    263:        u_int32_t plen;
1.5       itojun    264:        u_int32_t rtalert = ~0;
1.104     yamt      265:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    266:        struct ifnet *deliverifp = NULL;
1.64      itojun    267:        int srcrt = 0;
1.105     dyoung    268:        const struct rtentry *rt;
                    269:        union {
                    270:                struct sockaddr         dst;
                    271:                struct sockaddr_in6     dst6;
                    272:        } u;
1.94      degroote  273: #ifdef FAST_IPSEC
                    274:        struct m_tag *mtag;
                    275:        struct tdb_ident *tdbi;
                    276:        struct secpolicy *sp;
                    277:        int s, error;
                    278: #endif
1.2       itojun    279:
                    280: #ifdef IPSEC
                    281:        /*
                    282:         * should the inner packet be considered authentic?
                    283:         * see comment in ah4_input().
                    284:         */
1.49      itojun    285:        m->m_flags &= ~M_AUTHIPHDR;
                    286:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    287: #endif
1.9       itojun    288:
1.2       itojun    289:        /*
1.81      rpaulo    290:         * make sure we don't have onion peering information into m_tag.
                    291:         */
                    292:        ip6_delaux(m);
                    293:
                    294:        /*
1.44      itojun    295:         * mbuf statistics
1.2       itojun    296:         */
                    297:        if (m->m_flags & M_EXT) {
                    298:                if (m->m_next)
1.116     thorpej   299:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    300:                else
1.116     thorpej   301:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    302:        } else {
1.115     thorpej   303: #define M2MMAX 32
1.2       itojun    304:                if (m->m_next) {
1.9       itojun    305:                        if (m->m_flags & M_LOOP) {
1.116     thorpej   306:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115     thorpej   307:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116     thorpej   308:                                IP6_STATINC(IP6_STAT_M2M +
                    309:                                            m->m_pkthdr.rcvif->if_index);
1.115     thorpej   310:                        } else
1.116     thorpej   311:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    312:                } else
1.116     thorpej   313:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    314: #undef M2MMAX
1.2       itojun    315:        }
                    316:
1.9       itojun    317:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116     thorpej   318:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    319:
1.57      thorpej   320:        /*
                    321:         * If the IPv6 header is not aligned, slurp it up into a new
                    322:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    323:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   324:         * IPv6 header is in the first mbuf of the chain.
                    325:         */
1.97      christos  326:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   327:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    328:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    329:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    330:                        /* XXXJRT new stat, please */
1.116     thorpej   331:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.57      thorpej   332:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    333:                        return;
                    334:                }
                    335:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    336:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    337:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116     thorpej   338:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.9       itojun    339:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    340:                        return;
                    341:                }
1.2       itojun    342:        }
                    343:
                    344:        ip6 = mtod(m, struct ip6_hdr *);
                    345:
                    346:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116     thorpej   347:                IP6_STATINC(IP6_STAT_BADVERS);
1.9       itojun    348:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    349:                goto bad;
                    350:        }
1.15      darrenr   351:
1.98      liamjfoy  352: #if defined(IPSEC)
                    353:        /* IPv6 fast forwarding is not compatible with IPsec. */
                    354:        m->m_flags &= ~M_CANFASTFWD;
                    355: #else
                    356:        /*
                    357:         * Assume that we can create a fast-forward IP flow entry
                    358:         * based on this packet.
                    359:         */
                    360:        m->m_flags |= M_CANFASTFWD;
                    361: #endif
                    362:
1.15      darrenr   363: #ifdef PFIL_HOOKS
                    364:        /*
                    365:         * Run through list of hooks for input packets.  If there are any
                    366:         * filters which require that additional packets in the flow are
                    367:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    368:         * Note that filters must _never_ set this flag, as another filter
                    369:         * in the list may have previously cleared it.
                    370:         */
1.39      itojun    371:        /*
                    372:         * let ipfilter look at packet on the wire,
                    373:         * not the decapsulated packet.
                    374:         */
                    375: #ifdef IPSEC
1.42      itojun    376:        if (!ipsec_getnhist(m))
1.94      degroote  377: #elif defined(FAST_IPSEC)
                    378:        if (!ipsec_indone(m))
1.39      itojun    379: #else
                    380:        if (1)
                    381: #endif
                    382:        {
1.64      itojun    383:                struct in6_addr odst;
                    384:
                    385:                odst = ip6->ip6_dst;
1.39      itojun    386:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    387:                                   PFIL_IN) != 0)
                    388:                        return;
                    389:                if (m == NULL)
                    390:                        return;
                    391:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    392:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    393:        }
1.15      darrenr   394: #endif /* PFIL_HOOKS */
                    395:
1.116     thorpej   396:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    397:
1.30      thorpej   398: #ifdef ALTQ
                    399:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    400:                /* packet is dropped by traffic conditioner */
                    401:                return;
1.9       itojun    402:        }
                    403: #endif
                    404:
1.2       itojun    405:        /*
1.44      itojun    406:         * Check against address spoofing/corruption.
1.2       itojun    407:         */
                    408:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    409:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    410:                /*
                    411:                 * XXX: "badscope" is not very suitable for a multicast source.
                    412:                 */
1.116     thorpej   413:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.9       itojun    414:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    415:                goto bad;
                    416:        }
1.13      itojun    417:        /*
1.44      itojun    418:         * The following check is not documented in specs.  A malicious
                    419:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    420:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    421:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    422:         *
1.44      itojun    423:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    424:         * support IPv4-less kernel compilation, we cannot support SIIT
                    425:         * environment at all.  So, it makes more sense for us to reject any
                    426:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       427:         * partial support for SIIT environment.
1.13      itojun    428:         */
                    429:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    430:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   431:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    432:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    433:                goto bad;
                    434:        }
1.17      itojun    435: #if 0
1.13      itojun    436:        /*
1.17      itojun    437:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    438:         *
                    439:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    440:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    441:         * is revised to forbid relaying case.
1.13      itojun    442:         */
                    443:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    444:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116     thorpej   445:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    446:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    447:                goto bad;
                    448:        }
                    449: #endif
1.35      itojun    450:
1.2       itojun    451:        /*
1.82      yamt      452:         * Disambiguate address scope zones (if there is ambiguity).
                    453:         * We first make sure that the original source or destination address
                    454:         * is not in our internal form for scoped addresses.  Such addresses
                    455:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    456:         * to the usage conflict.
                    457:         * in6_setscope() then also checks and rejects the cases where src or
                    458:         * dst are the loopback address and the receiving interface
                    459:         * is not loopback.
                    460:         */
1.88      bouyer    461:        if (__predict_false(
                    462:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    463:                goto bad;
                    464:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      465:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116     thorpej   466:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      467:                goto bad;
                    468:        }
                    469:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    470:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116     thorpej   471:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      472:                goto bad;
                    473:        }
                    474:
                    475:        /*
1.2       itojun    476:         * Multicast check
                    477:         */
                    478:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    479:                struct  in6_multi *in6m = 0;
1.9       itojun    480:
                    481:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    482:                /*
                    483:                 * See if we belong to the destination multicast group on the
                    484:                 * arrival interface.
                    485:                 */
                    486:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    487:                if (in6m)
                    488:                        ours = 1;
                    489:                else if (!ip6_mrouter) {
1.116     thorpej   490:                        uint64_t *ip6s = IP6_STAT_GETREF();
                    491:                        ip6s[IP6_STAT_NOTMEMBER]++;
                    492:                        ip6s[IP6_STAT_CANTFORWARD]++;
                    493:                        IP6_STAT_PUTREF();
1.9       itojun    494:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    495:                        goto bad;
                    496:                }
1.9       itojun    497:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    498:                goto hbhcheck;
                    499:        }
                    500:
1.105     dyoung    501:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    502:
1.2       itojun    503:        /*
                    504:         *  Unicast check
                    505:         */
1.105     dyoung    506:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
                    507:        if (hit)
1.116     thorpej   508:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     509:        else
1.116     thorpej   510:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    511:
1.109     dyoung    512: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2       itojun    513:
                    514:        /*
                    515:         * Accept the packet if the forwarding interface to the destination
                    516:         * according to the routing table is the loopback interface,
                    517:         * unless the associated route has a gateway.
                    518:         * Note that this approach causes to accept a packet if there is a
                    519:         * route to the loopback interface for the destination of the packet.
                    520:         * But we think it's even useful in some situations, e.g. when using
                    521:         * a special daemon which wants to intercept the packet.
                    522:         */
1.105     dyoung    523:        if (rt != NULL &&
                    524:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    525:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    526: #if 0
                    527:            /*
                    528:             * The check below is redundant since the comparison of
                    529:             * the destination and the key of the rtentry has
                    530:             * already done through looking up the routing table.
                    531:             */
1.109     dyoung    532:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2       itojun    533: #endif
1.105     dyoung    534:            rt->rt_ifp->if_type == IFT_LOOP) {
                    535:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    536:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    537:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    538:                /*
                    539:                 * packets to a tentative, duplicated, or somehow invalid
                    540:                 * address must not be accepted.
                    541:                 */
1.2       itojun    542:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    543:                        /* this address is ready */
1.2       itojun    544:                        ours = 1;
1.9       itojun    545:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    546:                        goto hbhcheck;
                    547:                } else {
1.24      itojun    548:                        /* address is not ready, so discard the packet. */
1.34      itojun    549:                        nd6log((LOG_INFO,
1.27      itojun    550:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    551:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    552:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    553:
                    554:                        goto bad;
1.2       itojun    555:                }
                    556:        }
                    557:
                    558:        /*
1.55      itojun    559:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    560:         */
                    561: #if defined(NFAITH) && 0 < NFAITH
                    562:        if (ip6_keepfaith) {
1.105     dyoung    563:                if (rt != NULL && rt->rt_ifp != NULL &&
                    564:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    565:                        /* XXX do we need more sanity checks? */
                    566:                        ours = 1;
1.105     dyoung    567:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    568:                        goto hbhcheck;
                    569:                }
                    570:        }
                    571: #endif
                    572:
                    573: #if 0
                    574:     {
                    575:        /*
                    576:         * Last resort: check in6_ifaddr for incoming interface.
                    577:         * The code is here until I update the "goto ours hack" code above
                    578:         * working right.
                    579:         */
                    580:        struct ifaddr *ifa;
1.113     dyoung    581:        IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9       itojun    582:                if (ifa->ifa_addr == NULL)
                    583:                        continue;       /* just for safety */
                    584:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    585:                        continue;
                    586:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    587:                        ours = 1;
                    588:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    589:                        goto hbhcheck;
                    590:                }
                    591:        }
1.9       itojun    592:     }
1.2       itojun    593: #endif
                    594:
                    595:        /*
                    596:         * Now there is no reason to process the packet if it's not our own
                    597:         * and we're not a router.
                    598:         */
                    599:        if (!ip6_forwarding) {
1.116     thorpej   600:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9       itojun    601:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    602:                goto bad;
                    603:        }
                    604:
                    605:   hbhcheck:
                    606:        /*
1.81      rpaulo    607:         * record address information into m_tag, if we don't have one yet.
                    608:         * note that we are unable to record it, if the address is not listed
                    609:         * as our interface address (e.g. multicast addresses, addresses
                    610:         * within FAITH prefixes and such).
                    611:         */
1.111     dyoung    612:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    613:                struct in6_ifaddr *ia6;
                    614:
                    615:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111     dyoung    616:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    617:                        /*
                    618:                         * XXX maybe we should drop the packet here,
                    619:                         * as we could not provide enough information
                    620:                         * to the upper layers.
                    621:                         */
1.81      rpaulo    622:                }
                    623:        }
                    624:
                    625:        /*
1.2       itojun    626:         * Process Hop-by-Hop options header if it's contained.
                    627:         * m may be modified in ip6_hopopts_input().
                    628:         * If a JumboPayload option is included, plen will also be modified.
                    629:         */
                    630:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    631:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    632:                struct ip6_hbh *hbh;
                    633:
                    634:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    635: #if 0  /*touches NULL pointer*/
                    636:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    637: #endif
1.2       itojun    638:                        return; /* m have already been freed */
1.9       itojun    639:                }
1.22      itojun    640:
1.2       itojun    641:                /* adjust pointer */
                    642:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    643:
                    644:                /*
1.49      itojun    645:                 * if the payload length field is 0 and the next header field
1.22      itojun    646:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    647:                 * option MUST be included.
                    648:                 */
                    649:                if (ip6->ip6_plen == 0 && plen == 0) {
                    650:                        /*
                    651:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    652:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    653:                         * (non-zero) payload length to the variable plen.
1.22      itojun    654:                         */
1.116     thorpej   655:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    656:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    657:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    658:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    659:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  660:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    661:                        return;
                    662:                }
1.9       itojun    663:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    664:                        sizeof(struct ip6_hbh));
                    665:                if (hbh == NULL) {
1.116     thorpej   666:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    667:                        return;
                    668:                }
1.57      thorpej   669:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    670:                nxt = hbh->ip6h_nxt;
1.2       itojun    671:
                    672:                /*
                    673:                 * accept the packet if a router alert option is included
                    674:                 * and we act as an IPv6 router.
                    675:                 */
1.5       itojun    676:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    677:                        ours = 1;
                    678:        } else
                    679:                nxt = ip6->ip6_nxt;
                    680:
                    681:        /*
                    682:         * Check that the amount of data in the buffers
                    683:         * is as at least much as the IPv6 header would have us expect.
                    684:         * Trim mbufs if longer than we expect.
                    685:         * Drop packet if shorter than we expect.
                    686:         */
                    687:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116     thorpej   688:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    689:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    690:                goto bad;
                    691:        }
                    692:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    693:                if (m->m_len == m->m_pkthdr.len) {
                    694:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    695:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    696:                } else
                    697:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    698:        }
                    699:
                    700:        /*
                    701:         * Forward if desirable.
                    702:         */
                    703:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    704:                /*
                    705:                 * If we are acting as a multicast router, all
                    706:                 * incoming multicast packets are passed to the
                    707:                 * kernel-level multicast forwarding function.
                    708:                 * The packet is returned (relatively) intact; if
                    709:                 * ip6_mforward() returns a non-zero value, the packet
                    710:                 * must be discarded, else it may be accepted below.
                    711:                 */
                    712:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116     thorpej   713:                        IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2       itojun    714:                        m_freem(m);
                    715:                        return;
                    716:                }
                    717:                if (!ours) {
                    718:                        m_freem(m);
                    719:                        return;
                    720:                }
1.22      itojun    721:        } else if (!ours) {
1.64      itojun    722:                ip6_forward(m, srcrt);
1.2       itojun    723:                return;
1.56      itojun    724:        }
1.25      itojun    725:
                    726:        ip6 = mtod(m, struct ip6_hdr *);
                    727:
                    728:        /*
                    729:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    730:         * tcp/udp stack and bypass security checks (act as if it was from
                    731:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    732:         *
                    733:         * For SIIT end node behavior, you may want to disable the check.
                    734:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    735:         * source.
                    736:         */
                    737:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    738:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   739:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.25      itojun    740:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    741:                goto bad;
                    742:        }
1.2       itojun    743:
                    744:        /*
                    745:         * Tell launch routine the next header
                    746:         */
1.12      itojun    747: #ifdef IFA_STATS
1.28      itojun    748:        if (deliverifp != NULL) {
1.9       itojun    749:                struct in6_ifaddr *ia6;
                    750:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    751:                if (ia6)
                    752:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    753:        }
                    754: #endif
1.116     thorpej   755:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    756:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    757:        nest = 0;
1.40      itojun    758:
1.104     yamt      759:        rh_present = 0;
1.2       itojun    760:        while (nxt != IPPROTO_DONE) {
                    761:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116     thorpej   762:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104     yamt      763:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    764:                        goto bad;
                    765:                }
1.8       itojun    766:
                    767:                /*
                    768:                 * protection against faulty packet - there should be
                    769:                 * more sanity checks in header chain processing.
                    770:                 */
                    771:                if (m->m_pkthdr.len < off) {
1.116     thorpej   772:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    773:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    774:                        goto bad;
                    775:                }
                    776:
1.104     yamt      777:                if (nxt == IPPROTO_ROUTING) {
                    778:                        if (rh_present++) {
                    779:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
                    780:                                    ifs6_in_hdrerr);
1.116     thorpej   781:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      782:                                goto bad;
                    783:                        }
                    784:                }
                    785:
1.37      itojun    786: #ifdef IPSEC
                    787:                /*
                    788:                 * enforce IPsec policy checking if we are seeing last header.
                    789:                 * note that we do not visit this with protocols with pcb layer
                    790:                 * code - like udp/tcp/raw ip.
                    791:                 */
                    792:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    793:                    ipsec6_in_reject(m, NULL)) {
1.117     thorpej   794:                        IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.37      itojun    795:                        goto bad;
                    796:                }
                    797: #endif
1.94      degroote  798: #ifdef FAST_IPSEC
                    799:        /*
                    800:         * enforce IPsec policy checking if we are seeing last header.
                    801:         * note that we do not visit this with protocols with pcb layer
                    802:         * code - like udp/tcp/raw ip.
                    803:         */
                    804:        if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
                    805:                /*
                    806:                 * Check if the packet has already had IPsec processing
                    807:                 * done.  If so, then just pass it along.  This tag gets
                    808:                 * set during AH, ESP, etc. input handling, before the
                    809:                 * packet is returned to the ip input queue for delivery.
                    810:                 */
                    811:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    812:                s = splsoftnet();
                    813:                if (mtag != NULL) {
                    814:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    815:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    816:                } else {
                    817:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    818:                                                                        IP_FORWARDING, &error);
                    819:                }
                    820:                if (sp != NULL) {
                    821:                        /*
                    822:                         * Check security policy against packet attributes.
                    823:                         */
                    824:                        error = ipsec_in_reject(sp, m);
                    825:                        KEY_FREESP(&sp);
                    826:                } else {
                    827:                        /* XXX error stat??? */
                    828:                        error = EINVAL;
                    829:                        DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
                    830:                }
                    831:                splx(s);
                    832:                if (error)
                    833:                        goto bad;
                    834:        }
                    835: #endif /* FAST_IPSEC */
                    836:
1.56      itojun    837:
1.2       itojun    838:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    839:        }
                    840:        return;
                    841:  bad:
                    842:        m_freem(m);
                    843: }
                    844:
                    845: /*
1.81      rpaulo    846:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    847:  */
                    848: static struct m_tag *
1.112     dyoung    849: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    850: {
                    851:        struct m_tag *mtag;
                    852:
                    853:        mtag = ip6_addaux(m);
1.112     dyoung    854:        if (mtag != NULL) {
                    855:                struct ip6aux *ip6a;
                    856:
                    857:                ip6a = (struct ip6aux *)(mtag + 1);
                    858:                in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
                    859:                ip6a->ip6a_src = ia->ia_addr.sin6_addr;
                    860:                ip6a->ip6a_flags = ia->ia6_flags;
                    861:        }
1.81      rpaulo    862:        return mtag;    /* NULL if failed to set */
                    863: }
                    864:
1.112     dyoung    865: const struct ip6aux *
1.107     christos  866: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    867: {
                    868:        struct m_tag *mtag;
                    869:
                    870:        mtag = ip6_findaux(m);
1.112     dyoung    871:        if (mtag != NULL)
                    872:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    873:        else
                    874:                return NULL;
                    875: }
                    876:
                    877: /*
1.2       itojun    878:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    879:  * included, the real payload length will be stored in plenp.
1.107     christos  880:  *
                    881:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    882:  */
                    883: static int
1.107     christos  884: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
                    885:        struct mbuf **mp, int *offp)
1.2       itojun    886: {
1.35      itojun    887:        struct mbuf *m = *mp;
1.2       itojun    888:        int off = *offp, hbhlen;
                    889:        struct ip6_hbh *hbh;
                    890:
                    891:        /* validation of the length of the header */
1.9       itojun    892:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    893:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    894:        if (hbh == NULL) {
1.116     thorpej   895:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    896:                return -1;
                    897:        }
                    898:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    899:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    900:                hbhlen);
                    901:        if (hbh == NULL) {
1.116     thorpej   902:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    903:                return -1;
                    904:        }
1.57      thorpej   905:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    906:        off += hbhlen;
                    907:        hbhlen -= sizeof(struct ip6_hbh);
                    908:
                    909:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    910:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    911:                return (-1);
1.2       itojun    912:
                    913:        *offp = off;
                    914:        *mp = m;
1.58      itojun    915:        return (0);
1.2       itojun    916: }
                    917:
                    918: /*
                    919:  * Search header for all Hop-by-hop options and process each option.
                    920:  * This function is separate from ip6_hopopts_input() in order to
                    921:  * handle a case where the sending node itself process its hop-by-hop
                    922:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    923:  *
                    924:  * The function assumes that hbh header is located right after the IPv6 header
                    925:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    926:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    927:  */
                    928: int
1.107     christos  929: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
                    930:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    931: {
                    932:        struct ip6_hdr *ip6;
                    933:        int optlen = 0;
                    934:        u_int8_t *opt = opthead;
                    935:        u_int16_t rtalert_val;
1.22      itojun    936:        u_int32_t jumboplen;
1.55      itojun    937:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    938:
                    939:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    940:                switch (*opt) {
                    941:                case IP6OPT_PAD1:
                    942:                        optlen = 1;
                    943:                        break;
                    944:                case IP6OPT_PADN:
                    945:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   946:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    947:                                goto bad;
                    948:                        }
                    949:                        optlen = *(opt + 1) + 2;
                    950:                        break;
                    951:                case IP6OPT_RTALERT:
                    952:                        /* XXX may need check for alignment */
                    953:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116     thorpej   954:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    955:                                goto bad;
                    956:                        }
                    957:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    958:                                /* XXX stat */
                    959:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    960:                                    ICMP6_PARAMPROB_HEADER,
                    961:                                    erroff + opt + 1 - opthead);
                    962:                                return (-1);
1.35      itojun    963:                        }
                    964:                        optlen = IP6OPT_RTALERT_LEN;
1.126     tsutsui   965:                        memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35      itojun    966:                        *rtalertp = ntohs(rtalert_val);
                    967:                        break;
                    968:                case IP6OPT_JUMBO:
1.22      itojun    969:                        /* XXX may need check for alignment */
                    970:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116     thorpej   971:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    972:                                goto bad;
                    973:                        }
1.35      itojun    974:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    975:                                /* XXX stat */
                    976:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    977:                                    ICMP6_PARAMPROB_HEADER,
                    978:                                    erroff + opt + 1 - opthead);
                    979:                                return (-1);
1.35      itojun    980:                        }
1.22      itojun    981:                        optlen = IP6OPT_JUMBO_LEN;
                    982:
                    983:                        /*
                    984:                         * IPv6 packets that have non 0 payload length
1.35      itojun    985:                         * must not contain a jumbo payload option.
1.22      itojun    986:                         */
                    987:                        ip6 = mtod(m, struct ip6_hdr *);
                    988:                        if (ip6->ip6_plen) {
1.116     thorpej   989:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    990:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    991:                                    ICMP6_PARAMPROB_HEADER,
                    992:                                    erroff + opt - opthead);
                    993:                                return (-1);
1.22      itojun    994:                        }
1.2       itojun    995:
1.22      itojun    996:                        /*
                    997:                         * We may see jumbolen in unaligned location, so
                    998:                         * we'd need to perform bcopy().
                    999:                         */
1.126     tsutsui  1000:                        memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22      itojun   1001:                        jumboplen = (u_int32_t)htonl(jumboplen);
                   1002:
                   1003: #if 1
                   1004:                        /*
                   1005:                         * if there are multiple jumbo payload options,
                   1006:                         * *plenp will be non-zero and the packet will be
                   1007:                         * rejected.
                   1008:                         * the behavior may need some debate in ipngwg -
                   1009:                         * multiple options does not make sense, however,
                   1010:                         * there's no explicit mention in specification.
                   1011:                         */
                   1012:                        if (*plenp != 0) {
1.116     thorpej  1013:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun   1014:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1015:                                    ICMP6_PARAMPROB_HEADER,
                   1016:                                    erroff + opt + 2 - opthead);
                   1017:                                return (-1);
1.22      itojun   1018:                        }
1.8       itojun   1019: #endif
1.2       itojun   1020:
1.22      itojun   1021:                        /*
                   1022:                         * jumbo payload length must be larger than 65535.
                   1023:                         */
                   1024:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116     thorpej  1025:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun   1026:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1027:                                    ICMP6_PARAMPROB_HEADER,
                   1028:                                    erroff + opt + 2 - opthead);
                   1029:                                return (-1);
1.22      itojun   1030:                        }
                   1031:                        *plenp = jumboplen;
                   1032:
                   1033:                        break;
1.35      itojun   1034:                default:                /* unknown option */
                   1035:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej  1036:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun   1037:                                goto bad;
                   1038:                        }
1.55      itojun   1039:                        optlen = ip6_unknown_opt(opt, m,
                   1040:                            erroff + opt - opthead);
                   1041:                        if (optlen == -1)
                   1042:                                return (-1);
1.35      itojun   1043:                        optlen += 2;
                   1044:                        break;
1.2       itojun   1045:                }
                   1046:        }
                   1047:
1.55      itojun   1048:        return (0);
1.2       itojun   1049:
                   1050:   bad:
                   1051:        m_freem(m);
1.55      itojun   1052:        return (-1);
1.2       itojun   1053: }
                   1054:
                   1055: /*
                   1056:  * Unknown option processing.
                   1057:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1058:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1059:  * is not continuous in order to return an ICMPv6 error.
                   1060:  */
                   1061: int
1.107     christos 1062: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun   1063: {
                   1064:        struct ip6_hdr *ip6;
                   1065:
1.35      itojun   1066:        switch (IP6OPT_TYPE(*optp)) {
                   1067:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1068:                return ((int)*(optp + 1));
1.35      itojun   1069:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1070:                m_freem(m);
1.58      itojun   1071:                return (-1);
1.35      itojun   1072:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116     thorpej  1073:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1074:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1075:                return (-1);
1.35      itojun   1076:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116     thorpej  1077:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1078:                ip6 = mtod(m, struct ip6_hdr *);
                   1079:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1080:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1081:                        m_freem(m);
                   1082:                else
                   1083:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1084:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1085:                return (-1);
1.2       itojun   1086:        }
                   1087:
                   1088:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1089:        return (-1);
1.2       itojun   1090: }
                   1091:
                   1092: /*
1.9       itojun   1093:  * Create the "control" list for this pcb.
                   1094:  *
                   1095:  * The routine will be called from upper layer handlers like tcp6_input().
                   1096:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1097:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1098:  * very first mbuf on the mbuf chain.
                   1099:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1100:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1101:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1102:  */
                   1103: void
1.107     christos 1104: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
                   1105:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1106: {
1.85      rpaulo   1107: #ifdef RFC2292
                   1108: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1109: #else
                   1110: #define IS2292(x, y)   (y)
                   1111: #endif
                   1112:
1.123     christos 1113:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP
                   1114: #ifdef SO_OTIMESTAMP
                   1115:            || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                   1116: #endif
                   1117:        ) {
1.2       itojun   1118:                struct timeval tv;
                   1119:
                   1120:                microtime(&tv);
1.123     christos 1121: #ifdef SO_OTIMESTAMP
                   1122:                if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
                   1123:                        struct timeval50 tv50;
                   1124:                        timeval_to_timeval50(&tv, &tv50);
                   1125:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1126:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1127:                } else
                   1128: #endif
1.97      christos 1129:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1130:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1131:                if (*mp)
                   1132:                        mp = &(*mp)->m_next;
                   1133:        }
1.87      rpaulo   1134:
                   1135:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1136:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1137:                return;
                   1138:
1.2       itojun   1139:        /* RFC 2292 sec. 5 */
1.35      itojun   1140:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1141:                struct in6_pktinfo pi6;
1.85      rpaulo   1142:
1.126     tsutsui  1143:                memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81      rpaulo   1144:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1145:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1146:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1147:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1148:                    sizeof(struct in6_pktinfo),
                   1149:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1150:                if (*mp)
                   1151:                        mp = &(*mp)->m_next;
                   1152:        }
1.85      rpaulo   1153:
1.2       itojun   1154:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1155:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1156:
1.97      christos 1157:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1158:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1159:                if (*mp)
                   1160:                        mp = &(*mp)->m_next;
                   1161:        }
                   1162:
                   1163:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1164:                u_int32_t flowinfo;
                   1165:                int tclass;
                   1166:
                   1167:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1168:                flowinfo >>= 20;
                   1169:
                   1170:                tclass = flowinfo & 0xff;
1.97      christos 1171:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1172:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1173:
1.2       itojun   1174:                if (*mp)
                   1175:                        mp = &(*mp)->m_next;
                   1176:        }
                   1177:
                   1178:        /*
1.75      itojun   1179:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1180:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1181:         * strict, since there might be some hop-by-hop options which can be
                   1182:         * returned to normal user.
1.85      rpaulo   1183:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1184:         */
1.75      itojun   1185:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1186:                /*
                   1187:                 * Check if a hop-by-hop options header is contatined in the
                   1188:                 * received packet, and if so, store the options as ancillary
                   1189:                 * data. Note that a hop-by-hop options header must be
                   1190:                 * just after the IPv6 header, which fact is assured through
                   1191:                 * the IPv6 input processing.
                   1192:                 */
1.78      christos 1193:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1194:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1195:                        struct ip6_hbh *hbh;
                   1196:                        int hbhlen;
1.62      itojun   1197:                        struct mbuf *ext;
1.9       itojun   1198:
1.62      itojun   1199:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1200:                            xip6->ip6_nxt);
1.62      itojun   1201:                        if (ext == NULL) {
1.116     thorpej  1202:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1203:                                return;
                   1204:                        }
1.62      itojun   1205:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1206:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1207:                        if (hbhlen != ext->m_len) {
                   1208:                                m_freem(ext);
1.116     thorpej  1209:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1210:                                return;
                   1211:                        }
1.2       itojun   1212:
                   1213:                        /*
                   1214:                         * XXX: We copy whole the header even if a jumbo
                   1215:                         * payload option is included, which option is to
                   1216:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1217:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1218:                         */
1.97      christos 1219:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1220:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1221:                            IPPROTO_IPV6);
1.2       itojun   1222:                        if (*mp)
                   1223:                                mp = &(*mp)->m_next;
1.62      itojun   1224:                        m_freem(ext);
1.2       itojun   1225:                }
                   1226:        }
                   1227:
                   1228:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1229:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1230:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1231:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1232:
                   1233:                /*
                   1234:                 * Search for destination options headers or routing
                   1235:                 * header(s) through the header chain, and stores each
                   1236:                 * header as ancillary data.
                   1237:                 * Note that the order of the headers remains in
                   1238:                 * the chain of ancillary data.
                   1239:                 */
1.86      rpaulo   1240:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1241:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1242:                        int elen;
1.62      itojun   1243:                        struct mbuf *ext = NULL;
1.9       itojun   1244:
1.62      itojun   1245:                        /*
                   1246:                         * if it is not an extension header, don't try to
                   1247:                         * pull it from the chain.
                   1248:                         */
                   1249:                        switch (nxt) {
                   1250:                        case IPPROTO_DSTOPTS:
                   1251:                        case IPPROTO_ROUTING:
                   1252:                        case IPPROTO_HOPOPTS:
                   1253:                        case IPPROTO_AH: /* is it possible? */
                   1254:                                break;
                   1255:                        default:
                   1256:                                goto loopend;
                   1257:                        }
                   1258:
                   1259:                        ext = ip6_pullexthdr(m, off, nxt);
                   1260:                        if (ext == NULL) {
1.116     thorpej  1261:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1262:                                return;
                   1263:                        }
1.62      itojun   1264:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1265:                        if (nxt == IPPROTO_AH)
                   1266:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1267:                        else
                   1268:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1269:                        if (elen != ext->m_len) {
                   1270:                                m_freem(ext);
1.116     thorpej  1271:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1272:                                return;
                   1273:                        }
1.57      thorpej  1274:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1275:
1.35      itojun   1276:                        switch (nxt) {
1.62      itojun   1277:                        case IPPROTO_DSTOPTS:
1.127     martin   1278:                                if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35      itojun   1279:                                        break;
                   1280:
1.97      christos 1281:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1282:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1283:                                    IPPROTO_IPV6);
1.35      itojun   1284:                                if (*mp)
                   1285:                                        mp = &(*mp)->m_next;
                   1286:                                break;
                   1287:
                   1288:                        case IPPROTO_ROUTING:
1.127     martin   1289:                                if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35      itojun   1290:                                        break;
                   1291:
1.97      christos 1292:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1293:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1294:                                    IPPROTO_IPV6);
1.35      itojun   1295:                                if (*mp)
                   1296:                                        mp = &(*mp)->m_next;
                   1297:                                break;
                   1298:
1.62      itojun   1299:                        case IPPROTO_HOPOPTS:
                   1300:                        case IPPROTO_AH: /* is it possible? */
                   1301:                                break;
                   1302:
1.35      itojun   1303:                        default:
                   1304:                                /*
1.62      itojun   1305:                                 * other cases have been filtered in the above.
                   1306:                                 * none will visit this case.  here we supply
                   1307:                                 * the code just in case (nxt overwritten or
                   1308:                                 * other cases).
1.35      itojun   1309:                                 */
1.62      itojun   1310:                                m_freem(ext);
1.35      itojun   1311:                                goto loopend;
                   1312:
1.2       itojun   1313:                        }
                   1314:
                   1315:                        /* proceed with the next header. */
1.9       itojun   1316:                        off += elen;
1.2       itojun   1317:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1318:                        ip6e = NULL;
                   1319:                        m_freem(ext);
                   1320:                        ext = NULL;
1.2       itojun   1321:                }
                   1322:          loopend:
1.62      itojun   1323:                ;
1.2       itojun   1324:        }
1.62      itojun   1325: }
1.85      rpaulo   1326: #undef IS2292
                   1327:
                   1328:
                   1329: void
1.95      dyoung   1330: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1331:     uint32_t *mtu)
1.85      rpaulo   1332: {
                   1333:        struct socket *so;
                   1334:        struct mbuf *m_mtu;
                   1335:        struct ip6_mtuinfo mtuctl;
                   1336:
                   1337:        so = in6p->in6p_socket;
                   1338:
                   1339:        if (mtu == NULL)
                   1340:                return;
                   1341:
                   1342: #ifdef DIAGNOSTIC
                   1343:        if (so == NULL)         /* I believe this is impossible */
                   1344:                panic("ip6_notify_pmtu: socket is NULL");
                   1345: #endif
                   1346:
                   1347:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1348:        mtuctl.ip6m_mtu = *mtu;
                   1349:        mtuctl.ip6m_addr = *dst;
                   1350:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1351:                return;
                   1352:
1.97      christos 1353:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1354:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1355:                return;
                   1356:
1.95      dyoung   1357:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1358:            == 0) {
                   1359:                m_freem(m_mtu);
                   1360:                /* XXX: should count statistics */
                   1361:        } else
                   1362:                sorwakeup(so);
                   1363:
                   1364:        return;
                   1365: }
1.62      itojun   1366:
                   1367: /*
                   1368:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1369:  * contains the result, or NULL on error.
                   1370:  */
                   1371: static struct mbuf *
1.107     christos 1372: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1373: {
                   1374:        struct ip6_ext ip6e;
                   1375:        size_t elen;
                   1376:        struct mbuf *n;
                   1377:
                   1378: #ifdef DIAGNOSTIC
                   1379:        switch (nxt) {
                   1380:        case IPPROTO_DSTOPTS:
                   1381:        case IPPROTO_ROUTING:
                   1382:        case IPPROTO_HOPOPTS:
                   1383:        case IPPROTO_AH: /* is it possible? */
                   1384:                break;
                   1385:        default:
                   1386:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1387:        }
1.62      itojun   1388: #endif
1.2       itojun   1389:
1.97      christos 1390:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1391:        if (nxt == IPPROTO_AH)
                   1392:                elen = (ip6e.ip6e_len + 2) << 2;
                   1393:        else
                   1394:                elen = (ip6e.ip6e_len + 1) << 3;
                   1395:
                   1396:        MGET(n, M_DONTWAIT, MT_DATA);
                   1397:        if (n && elen >= MLEN) {
                   1398:                MCLGET(n, M_DONTWAIT);
                   1399:                if ((n->m_flags & M_EXT) == 0) {
                   1400:                        m_free(n);
                   1401:                        n = NULL;
                   1402:                }
                   1403:        }
                   1404:        if (!n)
                   1405:                return NULL;
                   1406:
                   1407:        n->m_len = 0;
                   1408:        if (elen >= M_TRAILINGSPACE(n)) {
                   1409:                m_free(n);
                   1410:                return NULL;
                   1411:        }
                   1412:
1.97      christos 1413:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1414:        n->m_len = elen;
                   1415:        return n;
1.2       itojun   1416: }
                   1417:
                   1418: /*
                   1419:  * Get pointer to the previous header followed by the header
                   1420:  * currently processed.
                   1421:  * XXX: This function supposes that
                   1422:  *     M includes all headers,
                   1423:  *     the next header field and the header length field of each header
                   1424:  *     are valid, and
                   1425:  *     the sum of each header length equals to OFF.
                   1426:  * Because of these assumptions, this function must be called very
                   1427:  * carefully. Moreover, it will not be used in the near future when
                   1428:  * we develop `neater' mechanism to process extension headers.
                   1429:  */
1.58      itojun   1430: u_int8_t *
1.107     christos 1431: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1432: {
                   1433:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1434:
                   1435:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1436:                return (&ip6->ip6_nxt);
1.2       itojun   1437:        else {
                   1438:                int len, nxt;
                   1439:                struct ip6_ext *ip6e = NULL;
                   1440:
                   1441:                nxt = ip6->ip6_nxt;
                   1442:                len = sizeof(struct ip6_hdr);
                   1443:                while (len < off) {
1.97      christos 1444:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1445:
1.35      itojun   1446:                        switch (nxt) {
1.2       itojun   1447:                        case IPPROTO_FRAGMENT:
                   1448:                                len += sizeof(struct ip6_frag);
                   1449:                                break;
                   1450:                        case IPPROTO_AH:
                   1451:                                len += (ip6e->ip6e_len + 2) << 2;
                   1452:                                break;
                   1453:                        default:
                   1454:                                len += (ip6e->ip6e_len + 1) << 3;
                   1455:                                break;
                   1456:                        }
                   1457:                        nxt = ip6e->ip6e_nxt;
                   1458:                }
                   1459:                if (ip6e)
1.58      itojun   1460:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1461:                else
                   1462:                        return NULL;
1.18      itojun   1463:        }
                   1464: }
                   1465:
                   1466: /*
                   1467:  * get next header offset.  m will be retained.
                   1468:  */
                   1469: int
1.107     christos 1470: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1471: {
                   1472:        struct ip6_hdr ip6;
                   1473:        struct ip6_ext ip6e;
                   1474:        struct ip6_frag fh;
                   1475:
                   1476:        /* just in case */
                   1477:        if (m == NULL)
                   1478:                panic("ip6_nexthdr: m == NULL");
                   1479:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1480:                return -1;
                   1481:
                   1482:        switch (proto) {
                   1483:        case IPPROTO_IPV6:
1.83      rpaulo   1484:                /* do not chase beyond intermediate IPv6 headers */
                   1485:                if (off != 0)
                   1486:                        return -1;
1.18      itojun   1487:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1488:                        return -1;
1.97      christos 1489:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1490:                if (nxtp)
                   1491:                        *nxtp = ip6.ip6_nxt;
                   1492:                off += sizeof(ip6);
                   1493:                return off;
                   1494:
                   1495:        case IPPROTO_FRAGMENT:
                   1496:                /*
                   1497:                 * terminate parsing if it is not the first fragment,
                   1498:                 * it does not make sense to parse through it.
                   1499:                 */
                   1500:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1501:                        return -1;
1.97      christos 1502:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1503:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1504:                        return -1;
                   1505:                if (nxtp)
                   1506:                        *nxtp = fh.ip6f_nxt;
                   1507:                off += sizeof(struct ip6_frag);
                   1508:                return off;
                   1509:
                   1510:        case IPPROTO_AH:
                   1511:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1512:                        return -1;
1.97      christos 1513:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1514:                if (nxtp)
                   1515:                        *nxtp = ip6e.ip6e_nxt;
                   1516:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1517:                if (m->m_pkthdr.len < off)
                   1518:                        return -1;
1.18      itojun   1519:                return off;
                   1520:
                   1521:        case IPPROTO_HOPOPTS:
                   1522:        case IPPROTO_ROUTING:
                   1523:        case IPPROTO_DSTOPTS:
                   1524:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1525:                        return -1;
1.97      christos 1526:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1527:                if (nxtp)
                   1528:                        *nxtp = ip6e.ip6e_nxt;
                   1529:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1530:                if (m->m_pkthdr.len < off)
                   1531:                        return -1;
1.18      itojun   1532:                return off;
                   1533:
                   1534:        case IPPROTO_NONE:
                   1535:        case IPPROTO_ESP:
                   1536:        case IPPROTO_IPCOMP:
                   1537:                /* give up */
                   1538:                return -1;
                   1539:
                   1540:        default:
                   1541:                return -1;
                   1542:        }
                   1543: }
                   1544:
                   1545: /*
                   1546:  * get offset for the last header in the chain.  m will be kept untainted.
                   1547:  */
                   1548: int
1.107     christos 1549: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1550: {
                   1551:        int newoff;
                   1552:        int nxt;
                   1553:
                   1554:        if (!nxtp) {
                   1555:                nxt = -1;
                   1556:                nxtp = &nxt;
                   1557:        }
1.86      rpaulo   1558:        for (;;) {
1.18      itojun   1559:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1560:                if (newoff < 0)
                   1561:                        return off;
                   1562:                else if (newoff < off)
                   1563:                        return -1;      /* invalid */
                   1564:                else if (newoff == off)
                   1565:                        return newoff;
                   1566:
                   1567:                off = newoff;
                   1568:                proto = *nxtp;
1.2       itojun   1569:        }
                   1570: }
                   1571:
1.81      rpaulo   1572: struct m_tag *
1.107     christos 1573: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1574: {
                   1575:        struct m_tag *mtag;
                   1576:
                   1577:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1578:        if (!mtag) {
                   1579:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1580:                    M_NOWAIT);
                   1581:                if (mtag) {
                   1582:                        m_tag_prepend(m, mtag);
1.124     cegger   1583:                        memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81      rpaulo   1584:                }
                   1585:        }
                   1586:        return mtag;
                   1587: }
                   1588:
                   1589: struct m_tag *
1.107     christos 1590: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1591: {
                   1592:        struct m_tag *mtag;
                   1593:
                   1594:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1595:        return mtag;
                   1596: }
                   1597:
                   1598: void
1.107     christos 1599: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1600: {
                   1601:        struct m_tag *mtag;
                   1602:
                   1603:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1604:        if (mtag)
                   1605:                m_tag_delete(m, mtag);
                   1606: }
                   1607:
1.98      liamjfoy 1608: #ifdef GATEWAY
                   1609: /*
                   1610:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1611:  * we could reduce this value, call ip6flow_reap();
                   1612:  */
                   1613: static int
1.101     liamjfoy 1614: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98      liamjfoy 1615: {
1.121     simonb   1616:        int error;
1.98      liamjfoy 1617:
1.121     simonb   1618:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1619:        if (error || newp == NULL)
                   1620:                return (error);
1.98      liamjfoy 1621:
1.121     simonb   1622:        mutex_enter(softnet_lock);
1.122     matt     1623:        KERNEL_LOCK(1, NULL);
1.120     matt     1624:
1.121     simonb   1625:        ip6flow_reap(0);
1.120     matt     1626:
                   1627:        KERNEL_UNLOCK_ONE(NULL);
1.121     simonb   1628:        mutex_exit(softnet_lock);
1.98      liamjfoy 1629:
1.121     simonb   1630:        return (0);
1.98      liamjfoy 1631: }
1.99      liamjfoy 1632:
                   1633: static int
                   1634: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1635: {
                   1636:        int error, tmp;
                   1637:        struct sysctlnode node;
                   1638:
                   1639:        node = *rnode;
                   1640:        tmp = ip6_hashsize;
                   1641:        node.sysctl_data = &tmp;
                   1642:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1643:        if (error || newp == NULL)
                   1644:                return (error);
                   1645:
                   1646:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1647:                /*
                   1648:                 * Can only fail due to malloc()
                   1649:                 */
1.120     matt     1650:                mutex_enter(softnet_lock);
1.122     matt     1651:                KERNEL_LOCK(1, NULL);
1.120     matt     1652:
                   1653:                error = ip6flow_invalidate_all(tmp);
                   1654:
                   1655:                KERNEL_UNLOCK_ONE(NULL);
                   1656:                mutex_exit(softnet_lock);
1.99      liamjfoy 1657:        } else {
                   1658:                /*
                   1659:                 * EINVAL if not a power of 2
1.121     simonb   1660:                 */
1.120     matt     1661:                error = EINVAL;
1.99      liamjfoy 1662:        }
                   1663:
1.120     matt     1664:        return error;
1.99      liamjfoy 1665: }
1.98      liamjfoy 1666: #endif /* GATEWAY */
                   1667:
1.2       itojun   1668: /*
                   1669:  * System control for IP6
                   1670:  */
                   1671:
1.120     matt     1672: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2       itojun   1673:        0,              0,              0,              0,
                   1674:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1675:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1676:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1677:        0,              0,              0,              0,
                   1678:        ENOPROTOOPT
                   1679: };
                   1680:
1.116     thorpej  1681: static int
                   1682: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
                   1683: {
                   1684:
1.119     thorpej  1685:        return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116     thorpej  1686: }
                   1687:
1.128   ! pooka    1688: static void
        !          1689: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2       itojun   1690: {
1.85      rpaulo   1691: #ifdef RFC2292
                   1692: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1693: #else
                   1694: #define IS2292(x, y)   (y)
                   1695: #endif
1.26      itojun   1696:
1.73      atatat   1697:        sysctl_createv(clog, 0, NULL, NULL,
                   1698:                       CTLFLAG_PERMANENT,
1.70      atatat   1699:                       CTLTYPE_NODE, "net", NULL,
                   1700:                       NULL, 0, NULL, 0,
                   1701:                       CTL_NET, CTL_EOL);
1.73      atatat   1702:        sysctl_createv(clog, 0, NULL, NULL,
                   1703:                       CTLFLAG_PERMANENT,
1.74      atatat   1704:                       CTLTYPE_NODE, "inet6",
                   1705:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1706:                       NULL, 0, NULL, 0,
                   1707:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1708:        sysctl_createv(clog, 0, NULL, NULL,
                   1709:                       CTLFLAG_PERMANENT,
1.74      atatat   1710:                       CTLTYPE_NODE, "ip6",
                   1711:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1712:                       NULL, 0, NULL, 0,
                   1713:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1714:
1.73      atatat   1715:        sysctl_createv(clog, 0, NULL, NULL,
                   1716:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1717:                       CTLTYPE_INT, "forwarding",
                   1718:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1719:                       NULL, 0, &ip6_forwarding, 0,
                   1720:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1721:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1722:        sysctl_createv(clog, 0, NULL, NULL,
                   1723:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1724:                       CTLTYPE_INT, "redirect",
                   1725:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1726:                       NULL, 0, &ip6_sendredirects, 0,
                   1727:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1728:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1729:        sysctl_createv(clog, 0, NULL, NULL,
                   1730:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1731:                       CTLTYPE_INT, "hlim",
                   1732:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1733:                       NULL, 0, &ip6_defhlim, 0,
                   1734:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1735:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1736: #ifdef notyet
1.73      atatat   1737:        sysctl_createv(clog, 0, NULL, NULL,
                   1738:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1739:                       CTLTYPE_INT, "mtu", NULL,
                   1740:                       NULL, 0, &, 0,
                   1741:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1742:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1743: #endif
                   1744: #ifdef __no_idea__
1.73      atatat   1745:        sysctl_createv(clog, 0, NULL, NULL,
                   1746:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1747:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1748:                       NULL, 0, &?, 0,
                   1749:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1750:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1751:        sysctl_createv(clog, 0, NULL, NULL,
                   1752:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1753:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1754:                       NULL, 0, &?, sizeof(?),
                   1755:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1756:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1757:        sysctl_createv(clog, 0, NULL, NULL,
                   1758:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1759:                       CTLTYPE_?, "mrtproto", NULL,
                   1760:                       NULL, 0, &?, sizeof(?),
                   1761:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1762:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1763: #endif
1.73      atatat   1764:        sysctl_createv(clog, 0, NULL, NULL,
                   1765:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1766:                       CTLTYPE_INT, "maxfragpackets",
                   1767:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1768:                                    "for reassembly"),
1.70      atatat   1769:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1770:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1771:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1772: #ifdef __no_idea__
1.73      atatat   1773:        sysctl_createv(clog, 0, NULL, NULL,
                   1774:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1775:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1776:                       NULL, 0, &?, 0,
                   1777:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1778:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1779:        sysctl_createv(clog, 0, NULL, NULL,
                   1780:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1781:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1782:                       NULL, 0, &?, 0,
                   1783:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1784:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1785: #endif
1.73      atatat   1786:        sysctl_createv(clog, 0, NULL, NULL,
                   1787:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1788:                       CTLTYPE_INT, "accept_rtadv",
                   1789:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1790:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1791:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1792:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1793:        sysctl_createv(clog, 0, NULL, NULL,
                   1794:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1795:                       CTLTYPE_INT, "keepfaith",
                   1796:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1797:                       NULL, 0, &ip6_keepfaith, 0,
                   1798:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1799:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1800:        sysctl_createv(clog, 0, NULL, NULL,
                   1801:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1802:                       CTLTYPE_INT, "log_interval",
                   1803:                       SYSCTL_DESCR("Minumum interval between logging "
                   1804:                                    "unroutable packets"),
1.70      atatat   1805:                       NULL, 0, &ip6_log_interval, 0,
                   1806:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1807:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1808:        sysctl_createv(clog, 0, NULL, NULL,
                   1809:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1810:                       CTLTYPE_INT, "hdrnestlimit",
                   1811:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1812:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1813:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1814:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1815:        sysctl_createv(clog, 0, NULL, NULL,
                   1816:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1817:                       CTLTYPE_INT, "dad_count",
                   1818:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1819:                                    "probes to send"),
1.70      atatat   1820:                       NULL, 0, &ip6_dad_count, 0,
                   1821:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1822:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1823:        sysctl_createv(clog, 0, NULL, NULL,
                   1824:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1825:                       CTLTYPE_INT, "auto_flowlabel",
                   1826:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1827:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1828:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1829:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1830:        sysctl_createv(clog, 0, NULL, NULL,
                   1831:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1832:                       CTLTYPE_INT, "defmcasthlim",
                   1833:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1834:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1835:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1836:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1837: #if NGIF > 0
1.73      atatat   1838:        sysctl_createv(clog, 0, NULL, NULL,
                   1839:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1840:                       CTLTYPE_INT, "gifhlim",
                   1841:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1842:                       NULL, 0, &ip6_gif_hlim, 0,
                   1843:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1844:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1845: #endif /* NGIF */
1.73      atatat   1846:        sysctl_createv(clog, 0, NULL, NULL,
                   1847:                       CTLFLAG_PERMANENT,
1.74      atatat   1848:                       CTLTYPE_STRING, "kame_version",
                   1849:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1850:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1851:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1852:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1853:        sysctl_createv(clog, 0, NULL, NULL,
                   1854:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1855:                       CTLTYPE_INT, "use_deprecated",
                   1856:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1857:                                    "source addresses"),
1.70      atatat   1858:                       NULL, 0, &ip6_use_deprecated, 0,
                   1859:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1860:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1861:        sysctl_createv(clog, 0, NULL, NULL,
                   1862:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1863:                       CTLTYPE_INT, "rr_prune", NULL,
                   1864:                       NULL, 0, &ip6_rr_prune, 0,
                   1865:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1866:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1867:        sysctl_createv(clog, 0, NULL, NULL,
                   1868:                       CTLFLAG_PERMANENT
1.70      atatat   1869: #ifndef INET6_BINDV6ONLY
1.73      atatat   1870:                       |CTLFLAG_READWRITE,
1.70      atatat   1871: #endif
1.74      atatat   1872:                       CTLTYPE_INT, "v6only",
                   1873:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1874:                                    "to PF_INET sockets"),
1.70      atatat   1875:                       NULL, 0, &ip6_v6only, 0,
                   1876:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1877:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1878:        sysctl_createv(clog, 0, NULL, NULL,
                   1879:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1880:                       CTLTYPE_INT, "anonportmin",
                   1881:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1882:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1883:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1884:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1885:        sysctl_createv(clog, 0, NULL, NULL,
                   1886:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1887:                       CTLTYPE_INT, "anonportmax",
                   1888:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1889:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1890:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1891:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1892: #ifndef IPNOPRIVPORTS
1.73      atatat   1893:        sysctl_createv(clog, 0, NULL, NULL,
                   1894:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1895:                       CTLTYPE_INT, "lowportmin",
                   1896:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1897:                                    "to assign"),
1.70      atatat   1898:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1899:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1900:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1901:        sysctl_createv(clog, 0, NULL, NULL,
                   1902:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1903:                       CTLTYPE_INT, "lowportmax",
                   1904:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1905:                                    "to assign"),
1.70      atatat   1906:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1907:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1908:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1909: #endif /* IPNOPRIVPORTS */
1.73      atatat   1910:        sysctl_createv(clog, 0, NULL, NULL,
                   1911:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1912:                       CTLTYPE_INT, "use_tempaddr",
                   1913:                       SYSCTL_DESCR("Use temporary address"),
                   1914:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1915:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1916:                       CTL_CREATE, CTL_EOL);
                   1917:        sysctl_createv(clog, 0, NULL, NULL,
                   1918:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1919:                       CTLTYPE_INT, "temppltime",
                   1920:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1921:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1922:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1923:                       CTL_CREATE, CTL_EOL);
                   1924:        sysctl_createv(clog, 0, NULL, NULL,
                   1925:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1926:                       CTLTYPE_INT, "tempvltime",
                   1927:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1928:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1929:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1930:                       CTL_CREATE, CTL_EOL);
                   1931:        sysctl_createv(clog, 0, NULL, NULL,
                   1932:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1933:                       CTLTYPE_INT, "maxfrags",
                   1934:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1935:                       NULL, 0, &ip6_maxfrags, 0,
                   1936:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1937:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1938:        sysctl_createv(clog, 0, NULL, NULL,
                   1939:                       CTLFLAG_PERMANENT,
                   1940:                       CTLTYPE_STRUCT, "stats",
                   1941:                       SYSCTL_DESCR("IPv6 statistics"),
1.116     thorpej  1942:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1943:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1944:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1945:        sysctl_createv(clog, 0, NULL, NULL,
                   1946:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1947:                       CTLTYPE_INT, "use_defaultzone",
                   1948:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1949:                       NULL, 0, &ip6_use_defzone, 0,
                   1950:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1951:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1952:        sysctl_createv(clog, 0, NULL, NULL,
                   1953:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1954:                       CTLTYPE_INT, "mcast_pmtu",
                   1955:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1956:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1957:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1958:                       CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1959: #ifdef GATEWAY
                   1960:        sysctl_createv(clog, 0, NULL, NULL,
                   1961:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1962:                        CTLTYPE_INT, "maxflows",
                   1963:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1964:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1965:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1966:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1967:        sysctl_createv(clog, 0, NULL, NULL,
                   1968:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1969:                        CTLTYPE_INT, "hashsize",
                   1970:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1971:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1972:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1973:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1974: #endif
1.2       itojun   1975: }
1.116     thorpej  1976:
                   1977: void
                   1978: ip6_statinc(u_int stat)
                   1979: {
                   1980:
                   1981:        KASSERT(stat < IP6_NSTATS);
                   1982:        IP6_STATINC(stat);
                   1983: }

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