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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.129.4.2

1.129.4.1  rmind       1: /*     $NetBSD$        */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
1.65      agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.129.4.1  rmind      65: __KERNEL_RCSID(0, "$NetBSD$");
1.2       itojun     66:
1.129     joerg      67: #include "opt_gateway.h"
1.2       itojun     68: #include "opt_inet.h"
1.85      rpaulo     69: #include "opt_inet6.h"
1.4       thorpej    70: #include "opt_ipsec.h"
1.15      darrenr    71: #include "opt_pfil_hooks.h"
1.123     christos   72: #include "opt_compat_netbsd.h"
1.2       itojun     73:
                     74: #include <sys/param.h>
                     75: #include <sys/systm.h>
                     76: #include <sys/malloc.h>
                     77: #include <sys/mbuf.h>
                     78: #include <sys/domain.h>
                     79: #include <sys/protosw.h>
                     80: #include <sys/socket.h>
                     81: #include <sys/socketvar.h>
                     82: #include <sys/errno.h>
                     83: #include <sys/time.h>
                     84: #include <sys/kernel.h>
                     85: #include <sys/syslog.h>
                     86: #include <sys/proc.h>
1.46      simonb     87: #include <sys/sysctl.h>
1.2       itojun     88:
                     89: #include <net/if.h>
                     90: #include <net/if_types.h>
                     91: #include <net/if_dl.h>
                     92: #include <net/route.h>
                     93: #include <net/netisr.h>
1.15      darrenr    94: #ifdef PFIL_HOOKS
                     95: #include <net/pfil.h>
                     96: #endif
1.2       itojun     97:
                     98: #include <netinet/in.h>
1.9       itojun     99: #include <netinet/in_systm.h>
                    100: #ifdef INET
                    101: #include <netinet/ip.h>
                    102: #include <netinet/ip_icmp.h>
1.45      itojun    103: #endif /* INET */
1.14      itojun    104: #include <netinet/ip6.h>
1.2       itojun    105: #include <netinet6/in6_var.h>
1.11      itojun    106: #include <netinet6/ip6_var.h>
1.116     thorpej   107: #include <netinet6/ip6_private.h>
1.2       itojun    108: #include <netinet6/in6_pcb.h>
1.14      itojun    109: #include <netinet/icmp6.h>
1.81      rpaulo    110: #include <netinet6/scope6_var.h>
1.2       itojun    111: #include <netinet6/in6_ifattach.h>
                    112: #include <netinet6/nd6.h>
                    113:
1.37      itojun    114: #ifdef IPSEC
                    115: #include <netinet6/ipsec.h>
1.117     thorpej   116: #include <netinet6/ipsec_private.h>
1.37      itojun    117: #endif
                    118:
1.94      degroote  119: #ifdef FAST_IPSEC
                    120: #include <netipsec/ipsec.h>
                    121: #include <netipsec/ipsec6.h>
                    122: #include <netipsec/key.h>
                    123: #endif /* FAST_IPSEC */
                    124:
1.123     christos  125: #ifdef COMPAT_50
                    126: #include <compat/sys/time.h>
                    127: #include <compat/sys/socket.h>
                    128: #endif
                    129:
1.2       itojun    130: #include <netinet6/ip6protosw.h>
                    131:
                    132: #include "faith.h"
                    133: #include "gif.h"
1.50      itojun    134:
                    135: #if NGIF > 0
                    136: #include <netinet6/in6_gif.h>
                    137: #endif
1.2       itojun    138:
1.9       itojun    139: #include <net/net_osdep.h>
                    140:
1.2       itojun    141: extern struct domain inet6domain;
                    142:
                    143: u_char ip6_protox[IPPROTO_MAX];
                    144: static int ip6qmaxlen = IFQ_MAXLEN;
                    145: struct in6_ifaddr *in6_ifaddr;
                    146: struct ifqueue ip6intrq;
                    147:
1.108     ad        148: extern callout_t in6_tmpaddrtimer_ch;
1.83      rpaulo    149:
1.2       itojun    150: int ip6_forward_srcrt;                 /* XXX */
                    151: int ip6_sourcecheck;                   /* XXX */
                    152: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    153:
1.29      thorpej   154: #ifdef PFIL_HOOKS
                    155: struct pfil_head inet6_pfil_hook;
                    156: #endif
                    157:
1.116     thorpej   158: percpu_t *ip6stat_percpu;
1.2       itojun    159:
1.111     dyoung    160: static void ip6_init2(void *);
1.112     dyoung    161: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    162:
1.111     dyoung    163: static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
                    164: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128     pooka     165: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2       itojun    166:
                    167: /*
                    168:  * IP6 initialization: fill in IP6 protocol switch table.
                    169:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    170:  */
                    171: void
1.114     matt      172: ip6_init(void)
1.2       itojun    173: {
1.78      christos  174:        const struct ip6protosw *pr;
1.35      itojun    175:        int i;
1.2       itojun    176:
1.128     pooka     177:        sysctl_net_inet6_ip6_setup(NULL);
1.78      christos  178:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    179:        if (pr == 0)
                    180:                panic("ip6_init");
                    181:        for (i = 0; i < IPPROTO_MAX; i++)
                    182:                ip6_protox[i] = pr - inet6sw;
1.78      christos  183:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    184:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    185:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    186:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    187:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    188:        ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81      rpaulo    189:        scope6_init();
                    190:        addrsel_policy_init();
1.2       itojun    191:        nd6_init();
                    192:        frag6_init();
1.83      rpaulo    193:        ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    194:
                    195:        ip6_init2((void *)0);
1.98      liamjfoy  196: #ifdef GATEWAY
1.99      liamjfoy  197:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  198: #endif
1.29      thorpej   199:
                    200: #ifdef PFIL_HOOKS
                    201:        /* Register our Packet Filter hook. */
1.33      thorpej   202:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    203:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   204:        i = pfil_head_register(&inet6_pfil_hook);
                    205:        if (i != 0)
                    206:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    207:                    "error %d\n", i);
                    208: #endif /* PFIL_HOOKS */
1.116     thorpej   209:
                    210:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2       itojun    211: }
                    212:
                    213: static void
1.90      christos  214: ip6_init2(void *dummy)
1.2       itojun    215: {
                    216:
                    217:        /* nd6_timer_init */
1.118     ad        218:        callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19      thorpej   219:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    220:
                    221:        /* timer for regeneranation of temporary addresses randomize ID */
1.118     ad        222:        callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83      rpaulo    223:        callout_reset(&in6_tmpaddrtimer_ch,
                    224:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    225:                       ip6_temp_regen_advance) * hz,
                    226:                      in6_tmpaddrtimer, NULL);
1.2       itojun    227: }
                    228:
                    229: /*
                    230:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    231:  */
                    232: void
1.114     matt      233: ip6intr(void)
1.2       itojun    234: {
                    235:        int s;
                    236:        struct mbuf *m;
                    237:
1.118     ad        238:        mutex_enter(softnet_lock);
                    239:        KERNEL_LOCK(1, NULL);
1.2       itojun    240:        for (;;) {
1.41      thorpej   241:                s = splnet();
1.2       itojun    242:                IF_DEQUEUE(&ip6intrq, m);
                    243:                splx(s);
                    244:                if (m == 0)
1.118     ad        245:                        break;
1.83      rpaulo    246:                /* drop the packet if IPv6 operation is disabled on the IF */
                    247:                if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    248:                        m_freem(m);
1.118     ad        249:                        break;
1.83      rpaulo    250:                }
1.2       itojun    251:                ip6_input(m);
                    252:        }
1.118     ad        253:        KERNEL_UNLOCK_ONE(NULL);
                    254:        mutex_exit(softnet_lock);
1.2       itojun    255: }
                    256:
1.103     dyoung    257: extern struct  route ip6_forward_rt;
1.2       itojun    258:
                    259: void
1.96      dyoung    260: ip6_input(struct mbuf *m)
1.2       itojun    261: {
1.9       itojun    262:        struct ip6_hdr *ip6;
1.105     dyoung    263:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    264:        u_int32_t plen;
1.5       itojun    265:        u_int32_t rtalert = ~0;
1.104     yamt      266:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    267:        struct ifnet *deliverifp = NULL;
1.64      itojun    268:        int srcrt = 0;
1.105     dyoung    269:        const struct rtentry *rt;
                    270:        union {
                    271:                struct sockaddr         dst;
                    272:                struct sockaddr_in6     dst6;
                    273:        } u;
1.94      degroote  274: #ifdef FAST_IPSEC
                    275:        struct m_tag *mtag;
                    276:        struct tdb_ident *tdbi;
                    277:        struct secpolicy *sp;
                    278:        int s, error;
                    279: #endif
1.2       itojun    280:
                    281: #ifdef IPSEC
                    282:        /*
                    283:         * should the inner packet be considered authentic?
                    284:         * see comment in ah4_input().
                    285:         */
1.49      itojun    286:        m->m_flags &= ~M_AUTHIPHDR;
                    287:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    288: #endif
1.9       itojun    289:
1.2       itojun    290:        /*
1.81      rpaulo    291:         * make sure we don't have onion peering information into m_tag.
                    292:         */
                    293:        ip6_delaux(m);
                    294:
                    295:        /*
1.44      itojun    296:         * mbuf statistics
1.2       itojun    297:         */
                    298:        if (m->m_flags & M_EXT) {
                    299:                if (m->m_next)
1.116     thorpej   300:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    301:                else
1.116     thorpej   302:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    303:        } else {
1.115     thorpej   304: #define M2MMAX 32
1.2       itojun    305:                if (m->m_next) {
1.9       itojun    306:                        if (m->m_flags & M_LOOP) {
1.116     thorpej   307:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115     thorpej   308:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116     thorpej   309:                                IP6_STATINC(IP6_STAT_M2M +
                    310:                                            m->m_pkthdr.rcvif->if_index);
1.115     thorpej   311:                        } else
1.116     thorpej   312:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    313:                } else
1.116     thorpej   314:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    315: #undef M2MMAX
1.2       itojun    316:        }
                    317:
1.9       itojun    318:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116     thorpej   319:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    320:
1.57      thorpej   321:        /*
                    322:         * If the IPv6 header is not aligned, slurp it up into a new
                    323:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    324:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   325:         * IPv6 header is in the first mbuf of the chain.
                    326:         */
1.97      christos  327:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   328:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    329:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    330:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    331:                        /* XXXJRT new stat, please */
1.116     thorpej   332:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.57      thorpej   333:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    334:                        return;
                    335:                }
                    336:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    337:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    338:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116     thorpej   339:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.9       itojun    340:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    341:                        return;
                    342:                }
1.2       itojun    343:        }
                    344:
                    345:        ip6 = mtod(m, struct ip6_hdr *);
                    346:
                    347:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116     thorpej   348:                IP6_STATINC(IP6_STAT_BADVERS);
1.9       itojun    349:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    350:                goto bad;
                    351:        }
1.15      darrenr   352:
1.98      liamjfoy  353: #if defined(IPSEC)
                    354:        /* IPv6 fast forwarding is not compatible with IPsec. */
                    355:        m->m_flags &= ~M_CANFASTFWD;
                    356: #else
                    357:        /*
                    358:         * Assume that we can create a fast-forward IP flow entry
                    359:         * based on this packet.
                    360:         */
                    361:        m->m_flags |= M_CANFASTFWD;
                    362: #endif
                    363:
1.15      darrenr   364: #ifdef PFIL_HOOKS
                    365:        /*
                    366:         * Run through list of hooks for input packets.  If there are any
                    367:         * filters which require that additional packets in the flow are
                    368:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    369:         * Note that filters must _never_ set this flag, as another filter
                    370:         * in the list may have previously cleared it.
                    371:         */
1.39      itojun    372:        /*
                    373:         * let ipfilter look at packet on the wire,
                    374:         * not the decapsulated packet.
                    375:         */
                    376: #ifdef IPSEC
1.42      itojun    377:        if (!ipsec_getnhist(m))
1.94      degroote  378: #elif defined(FAST_IPSEC)
                    379:        if (!ipsec_indone(m))
1.39      itojun    380: #else
                    381:        if (1)
                    382: #endif
                    383:        {
1.64      itojun    384:                struct in6_addr odst;
                    385:
                    386:                odst = ip6->ip6_dst;
1.39      itojun    387:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    388:                                   PFIL_IN) != 0)
                    389:                        return;
                    390:                if (m == NULL)
                    391:                        return;
                    392:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    393:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    394:        }
1.15      darrenr   395: #endif /* PFIL_HOOKS */
                    396:
1.116     thorpej   397:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    398:
1.30      thorpej   399: #ifdef ALTQ
                    400:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    401:                /* packet is dropped by traffic conditioner */
                    402:                return;
1.9       itojun    403:        }
                    404: #endif
                    405:
1.2       itojun    406:        /*
1.44      itojun    407:         * Check against address spoofing/corruption.
1.2       itojun    408:         */
                    409:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    410:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    411:                /*
                    412:                 * XXX: "badscope" is not very suitable for a multicast source.
                    413:                 */
1.116     thorpej   414:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.9       itojun    415:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    416:                goto bad;
                    417:        }
1.13      itojun    418:        /*
1.44      itojun    419:         * The following check is not documented in specs.  A malicious
                    420:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    421:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    422:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    423:         *
1.44      itojun    424:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    425:         * support IPv4-less kernel compilation, we cannot support SIIT
                    426:         * environment at all.  So, it makes more sense for us to reject any
                    427:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       428:         * partial support for SIIT environment.
1.13      itojun    429:         */
                    430:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    431:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   432:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    433:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    434:                goto bad;
                    435:        }
1.17      itojun    436: #if 0
1.13      itojun    437:        /*
1.17      itojun    438:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    439:         *
                    440:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    441:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    442:         * is revised to forbid relaying case.
1.13      itojun    443:         */
                    444:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    445:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116     thorpej   446:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    447:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    448:                goto bad;
                    449:        }
                    450: #endif
1.35      itojun    451:
1.2       itojun    452:        /*
1.82      yamt      453:         * Disambiguate address scope zones (if there is ambiguity).
                    454:         * We first make sure that the original source or destination address
                    455:         * is not in our internal form for scoped addresses.  Such addresses
                    456:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    457:         * to the usage conflict.
                    458:         * in6_setscope() then also checks and rejects the cases where src or
                    459:         * dst are the loopback address and the receiving interface
                    460:         * is not loopback.
                    461:         */
1.88      bouyer    462:        if (__predict_false(
                    463:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    464:                goto bad;
                    465:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      466:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116     thorpej   467:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      468:                goto bad;
                    469:        }
                    470:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    471:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116     thorpej   472:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      473:                goto bad;
                    474:        }
                    475:
                    476:        /*
1.2       itojun    477:         * Multicast check
                    478:         */
                    479:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    480:                struct  in6_multi *in6m = 0;
1.9       itojun    481:
                    482:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    483:                /*
                    484:                 * See if we belong to the destination multicast group on the
                    485:                 * arrival interface.
                    486:                 */
                    487:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    488:                if (in6m)
                    489:                        ours = 1;
                    490:                else if (!ip6_mrouter) {
1.116     thorpej   491:                        uint64_t *ip6s = IP6_STAT_GETREF();
                    492:                        ip6s[IP6_STAT_NOTMEMBER]++;
                    493:                        ip6s[IP6_STAT_CANTFORWARD]++;
                    494:                        IP6_STAT_PUTREF();
1.9       itojun    495:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    496:                        goto bad;
                    497:                }
1.9       itojun    498:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    499:                goto hbhcheck;
                    500:        }
                    501:
1.105     dyoung    502:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    503:
1.2       itojun    504:        /*
                    505:         *  Unicast check
                    506:         */
1.105     dyoung    507:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
                    508:        if (hit)
1.116     thorpej   509:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     510:        else
1.116     thorpej   511:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    512:
1.109     dyoung    513: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2       itojun    514:
                    515:        /*
                    516:         * Accept the packet if the forwarding interface to the destination
                    517:         * according to the routing table is the loopback interface,
                    518:         * unless the associated route has a gateway.
                    519:         * Note that this approach causes to accept a packet if there is a
                    520:         * route to the loopback interface for the destination of the packet.
                    521:         * But we think it's even useful in some situations, e.g. when using
                    522:         * a special daemon which wants to intercept the packet.
                    523:         */
1.105     dyoung    524:        if (rt != NULL &&
                    525:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    526:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    527: #if 0
                    528:            /*
                    529:             * The check below is redundant since the comparison of
                    530:             * the destination and the key of the rtentry has
                    531:             * already done through looking up the routing table.
                    532:             */
1.109     dyoung    533:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2       itojun    534: #endif
1.105     dyoung    535:            rt->rt_ifp->if_type == IFT_LOOP) {
                    536:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    537:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    538:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    539:                /*
                    540:                 * packets to a tentative, duplicated, or somehow invalid
                    541:                 * address must not be accepted.
                    542:                 */
1.2       itojun    543:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    544:                        /* this address is ready */
1.2       itojun    545:                        ours = 1;
1.9       itojun    546:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    547:                        goto hbhcheck;
                    548:                } else {
1.24      itojun    549:                        /* address is not ready, so discard the packet. */
1.34      itojun    550:                        nd6log((LOG_INFO,
1.27      itojun    551:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    552:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    553:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    554:
                    555:                        goto bad;
1.2       itojun    556:                }
                    557:        }
                    558:
                    559:        /*
1.55      itojun    560:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    561:         */
                    562: #if defined(NFAITH) && 0 < NFAITH
                    563:        if (ip6_keepfaith) {
1.105     dyoung    564:                if (rt != NULL && rt->rt_ifp != NULL &&
                    565:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    566:                        /* XXX do we need more sanity checks? */
                    567:                        ours = 1;
1.105     dyoung    568:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    569:                        goto hbhcheck;
                    570:                }
                    571:        }
                    572: #endif
                    573:
                    574: #if 0
                    575:     {
                    576:        /*
                    577:         * Last resort: check in6_ifaddr for incoming interface.
                    578:         * The code is here until I update the "goto ours hack" code above
                    579:         * working right.
                    580:         */
                    581:        struct ifaddr *ifa;
1.113     dyoung    582:        IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9       itojun    583:                if (ifa->ifa_addr == NULL)
                    584:                        continue;       /* just for safety */
                    585:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    586:                        continue;
                    587:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    588:                        ours = 1;
                    589:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    590:                        goto hbhcheck;
                    591:                }
                    592:        }
1.9       itojun    593:     }
1.2       itojun    594: #endif
                    595:
                    596:        /*
                    597:         * Now there is no reason to process the packet if it's not our own
                    598:         * and we're not a router.
                    599:         */
                    600:        if (!ip6_forwarding) {
1.116     thorpej   601:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9       itojun    602:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    603:                goto bad;
                    604:        }
                    605:
                    606:   hbhcheck:
                    607:        /*
1.81      rpaulo    608:         * record address information into m_tag, if we don't have one yet.
                    609:         * note that we are unable to record it, if the address is not listed
                    610:         * as our interface address (e.g. multicast addresses, addresses
                    611:         * within FAITH prefixes and such).
                    612:         */
1.111     dyoung    613:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    614:                struct in6_ifaddr *ia6;
                    615:
                    616:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111     dyoung    617:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    618:                        /*
                    619:                         * XXX maybe we should drop the packet here,
                    620:                         * as we could not provide enough information
                    621:                         * to the upper layers.
                    622:                         */
1.81      rpaulo    623:                }
                    624:        }
                    625:
                    626:        /*
1.2       itojun    627:         * Process Hop-by-Hop options header if it's contained.
                    628:         * m may be modified in ip6_hopopts_input().
                    629:         * If a JumboPayload option is included, plen will also be modified.
                    630:         */
                    631:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    632:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    633:                struct ip6_hbh *hbh;
                    634:
                    635:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    636: #if 0  /*touches NULL pointer*/
                    637:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    638: #endif
1.2       itojun    639:                        return; /* m have already been freed */
1.9       itojun    640:                }
1.22      itojun    641:
1.2       itojun    642:                /* adjust pointer */
                    643:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    644:
                    645:                /*
1.49      itojun    646:                 * if the payload length field is 0 and the next header field
1.22      itojun    647:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    648:                 * option MUST be included.
                    649:                 */
                    650:                if (ip6->ip6_plen == 0 && plen == 0) {
                    651:                        /*
                    652:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    653:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    654:                         * (non-zero) payload length to the variable plen.
1.22      itojun    655:                         */
1.116     thorpej   656:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    657:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    658:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    659:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    660:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  661:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    662:                        return;
                    663:                }
1.9       itojun    664:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    665:                        sizeof(struct ip6_hbh));
                    666:                if (hbh == NULL) {
1.116     thorpej   667:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    668:                        return;
                    669:                }
1.57      thorpej   670:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    671:                nxt = hbh->ip6h_nxt;
1.2       itojun    672:
                    673:                /*
                    674:                 * accept the packet if a router alert option is included
                    675:                 * and we act as an IPv6 router.
                    676:                 */
1.5       itojun    677:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    678:                        ours = 1;
                    679:        } else
                    680:                nxt = ip6->ip6_nxt;
                    681:
                    682:        /*
                    683:         * Check that the amount of data in the buffers
                    684:         * is as at least much as the IPv6 header would have us expect.
                    685:         * Trim mbufs if longer than we expect.
                    686:         * Drop packet if shorter than we expect.
                    687:         */
                    688:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116     thorpej   689:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    690:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    691:                goto bad;
                    692:        }
                    693:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    694:                if (m->m_len == m->m_pkthdr.len) {
                    695:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    696:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    697:                } else
                    698:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    699:        }
                    700:
                    701:        /*
                    702:         * Forward if desirable.
                    703:         */
                    704:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    705:                /*
                    706:                 * If we are acting as a multicast router, all
                    707:                 * incoming multicast packets are passed to the
                    708:                 * kernel-level multicast forwarding function.
                    709:                 * The packet is returned (relatively) intact; if
                    710:                 * ip6_mforward() returns a non-zero value, the packet
                    711:                 * must be discarded, else it may be accepted below.
                    712:                 */
                    713:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116     thorpej   714:                        IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2       itojun    715:                        m_freem(m);
                    716:                        return;
                    717:                }
                    718:                if (!ours) {
                    719:                        m_freem(m);
                    720:                        return;
                    721:                }
1.22      itojun    722:        } else if (!ours) {
1.64      itojun    723:                ip6_forward(m, srcrt);
1.2       itojun    724:                return;
1.56      itojun    725:        }
1.25      itojun    726:
                    727:        ip6 = mtod(m, struct ip6_hdr *);
                    728:
                    729:        /*
                    730:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    731:         * tcp/udp stack and bypass security checks (act as if it was from
                    732:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    733:         *
                    734:         * For SIIT end node behavior, you may want to disable the check.
                    735:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    736:         * source.
                    737:         */
                    738:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    739:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   740:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.25      itojun    741:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    742:                goto bad;
                    743:        }
1.2       itojun    744:
                    745:        /*
                    746:         * Tell launch routine the next header
                    747:         */
1.12      itojun    748: #ifdef IFA_STATS
1.28      itojun    749:        if (deliverifp != NULL) {
1.9       itojun    750:                struct in6_ifaddr *ia6;
                    751:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    752:                if (ia6)
                    753:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    754:        }
                    755: #endif
1.116     thorpej   756:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    757:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    758:        nest = 0;
1.40      itojun    759:
1.104     yamt      760:        rh_present = 0;
1.2       itojun    761:        while (nxt != IPPROTO_DONE) {
                    762:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116     thorpej   763:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104     yamt      764:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    765:                        goto bad;
                    766:                }
1.8       itojun    767:
                    768:                /*
                    769:                 * protection against faulty packet - there should be
                    770:                 * more sanity checks in header chain processing.
                    771:                 */
                    772:                if (m->m_pkthdr.len < off) {
1.116     thorpej   773:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    774:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    775:                        goto bad;
                    776:                }
                    777:
1.104     yamt      778:                if (nxt == IPPROTO_ROUTING) {
                    779:                        if (rh_present++) {
                    780:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
                    781:                                    ifs6_in_hdrerr);
1.116     thorpej   782:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      783:                                goto bad;
                    784:                        }
                    785:                }
                    786:
1.37      itojun    787: #ifdef IPSEC
                    788:                /*
                    789:                 * enforce IPsec policy checking if we are seeing last header.
                    790:                 * note that we do not visit this with protocols with pcb layer
                    791:                 * code - like udp/tcp/raw ip.
                    792:                 */
                    793:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    794:                    ipsec6_in_reject(m, NULL)) {
1.117     thorpej   795:                        IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.37      itojun    796:                        goto bad;
                    797:                }
                    798: #endif
1.94      degroote  799: #ifdef FAST_IPSEC
                    800:        /*
                    801:         * enforce IPsec policy checking if we are seeing last header.
                    802:         * note that we do not visit this with protocols with pcb layer
                    803:         * code - like udp/tcp/raw ip.
                    804:         */
                    805:        if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
                    806:                /*
                    807:                 * Check if the packet has already had IPsec processing
                    808:                 * done.  If so, then just pass it along.  This tag gets
                    809:                 * set during AH, ESP, etc. input handling, before the
                    810:                 * packet is returned to the ip input queue for delivery.
                    811:                 */
                    812:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    813:                s = splsoftnet();
                    814:                if (mtag != NULL) {
                    815:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    816:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    817:                } else {
                    818:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    819:                                                                        IP_FORWARDING, &error);
                    820:                }
                    821:                if (sp != NULL) {
                    822:                        /*
                    823:                         * Check security policy against packet attributes.
                    824:                         */
                    825:                        error = ipsec_in_reject(sp, m);
                    826:                        KEY_FREESP(&sp);
                    827:                } else {
                    828:                        /* XXX error stat??? */
                    829:                        error = EINVAL;
                    830:                        DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
                    831:                }
                    832:                splx(s);
                    833:                if (error)
                    834:                        goto bad;
                    835:        }
                    836: #endif /* FAST_IPSEC */
                    837:
1.56      itojun    838:
1.2       itojun    839:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    840:        }
                    841:        return;
                    842:  bad:
                    843:        m_freem(m);
                    844: }
                    845:
                    846: /*
1.81      rpaulo    847:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    848:  */
                    849: static struct m_tag *
1.112     dyoung    850: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    851: {
                    852:        struct m_tag *mtag;
                    853:
                    854:        mtag = ip6_addaux(m);
1.112     dyoung    855:        if (mtag != NULL) {
                    856:                struct ip6aux *ip6a;
                    857:
                    858:                ip6a = (struct ip6aux *)(mtag + 1);
                    859:                in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
                    860:                ip6a->ip6a_src = ia->ia_addr.sin6_addr;
                    861:                ip6a->ip6a_flags = ia->ia6_flags;
                    862:        }
1.81      rpaulo    863:        return mtag;    /* NULL if failed to set */
                    864: }
                    865:
1.112     dyoung    866: const struct ip6aux *
1.107     christos  867: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    868: {
                    869:        struct m_tag *mtag;
                    870:
                    871:        mtag = ip6_findaux(m);
1.112     dyoung    872:        if (mtag != NULL)
                    873:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    874:        else
                    875:                return NULL;
                    876: }
                    877:
                    878: /*
1.2       itojun    879:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    880:  * included, the real payload length will be stored in plenp.
1.107     christos  881:  *
                    882:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    883:  */
                    884: static int
1.107     christos  885: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
                    886:        struct mbuf **mp, int *offp)
1.2       itojun    887: {
1.35      itojun    888:        struct mbuf *m = *mp;
1.2       itojun    889:        int off = *offp, hbhlen;
                    890:        struct ip6_hbh *hbh;
                    891:
                    892:        /* validation of the length of the header */
1.9       itojun    893:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    894:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    895:        if (hbh == NULL) {
1.116     thorpej   896:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    897:                return -1;
                    898:        }
                    899:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    900:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    901:                hbhlen);
                    902:        if (hbh == NULL) {
1.116     thorpej   903:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    904:                return -1;
                    905:        }
1.57      thorpej   906:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    907:        off += hbhlen;
                    908:        hbhlen -= sizeof(struct ip6_hbh);
                    909:
                    910:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    911:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    912:                return (-1);
1.2       itojun    913:
                    914:        *offp = off;
                    915:        *mp = m;
1.58      itojun    916:        return (0);
1.2       itojun    917: }
                    918:
                    919: /*
                    920:  * Search header for all Hop-by-hop options and process each option.
                    921:  * This function is separate from ip6_hopopts_input() in order to
                    922:  * handle a case where the sending node itself process its hop-by-hop
                    923:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    924:  *
                    925:  * The function assumes that hbh header is located right after the IPv6 header
                    926:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    927:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    928:  */
                    929: int
1.107     christos  930: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
                    931:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    932: {
                    933:        struct ip6_hdr *ip6;
                    934:        int optlen = 0;
                    935:        u_int8_t *opt = opthead;
                    936:        u_int16_t rtalert_val;
1.22      itojun    937:        u_int32_t jumboplen;
1.55      itojun    938:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    939:
                    940:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    941:                switch (*opt) {
                    942:                case IP6OPT_PAD1:
                    943:                        optlen = 1;
                    944:                        break;
                    945:                case IP6OPT_PADN:
                    946:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   947:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    948:                                goto bad;
                    949:                        }
                    950:                        optlen = *(opt + 1) + 2;
                    951:                        break;
                    952:                case IP6OPT_RTALERT:
                    953:                        /* XXX may need check for alignment */
                    954:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116     thorpej   955:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    956:                                goto bad;
                    957:                        }
                    958:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    959:                                /* XXX stat */
                    960:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    961:                                    ICMP6_PARAMPROB_HEADER,
                    962:                                    erroff + opt + 1 - opthead);
                    963:                                return (-1);
1.35      itojun    964:                        }
                    965:                        optlen = IP6OPT_RTALERT_LEN;
1.126     tsutsui   966:                        memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35      itojun    967:                        *rtalertp = ntohs(rtalert_val);
                    968:                        break;
                    969:                case IP6OPT_JUMBO:
1.22      itojun    970:                        /* XXX may need check for alignment */
                    971:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116     thorpej   972:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    973:                                goto bad;
                    974:                        }
1.35      itojun    975:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    976:                                /* XXX stat */
                    977:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    978:                                    ICMP6_PARAMPROB_HEADER,
                    979:                                    erroff + opt + 1 - opthead);
                    980:                                return (-1);
1.35      itojun    981:                        }
1.22      itojun    982:                        optlen = IP6OPT_JUMBO_LEN;
                    983:
                    984:                        /*
                    985:                         * IPv6 packets that have non 0 payload length
1.35      itojun    986:                         * must not contain a jumbo payload option.
1.22      itojun    987:                         */
                    988:                        ip6 = mtod(m, struct ip6_hdr *);
                    989:                        if (ip6->ip6_plen) {
1.116     thorpej   990:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    991:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    992:                                    ICMP6_PARAMPROB_HEADER,
                    993:                                    erroff + opt - opthead);
                    994:                                return (-1);
1.22      itojun    995:                        }
1.2       itojun    996:
1.22      itojun    997:                        /*
                    998:                         * We may see jumbolen in unaligned location, so
                    999:                         * we'd need to perform bcopy().
                   1000:                         */
1.126     tsutsui  1001:                        memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22      itojun   1002:                        jumboplen = (u_int32_t)htonl(jumboplen);
                   1003:
                   1004: #if 1
                   1005:                        /*
                   1006:                         * if there are multiple jumbo payload options,
                   1007:                         * *plenp will be non-zero and the packet will be
                   1008:                         * rejected.
                   1009:                         * the behavior may need some debate in ipngwg -
                   1010:                         * multiple options does not make sense, however,
                   1011:                         * there's no explicit mention in specification.
                   1012:                         */
                   1013:                        if (*plenp != 0) {
1.116     thorpej  1014:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun   1015:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1016:                                    ICMP6_PARAMPROB_HEADER,
                   1017:                                    erroff + opt + 2 - opthead);
                   1018:                                return (-1);
1.22      itojun   1019:                        }
1.8       itojun   1020: #endif
1.2       itojun   1021:
1.22      itojun   1022:                        /*
                   1023:                         * jumbo payload length must be larger than 65535.
                   1024:                         */
                   1025:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116     thorpej  1026:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun   1027:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1028:                                    ICMP6_PARAMPROB_HEADER,
                   1029:                                    erroff + opt + 2 - opthead);
                   1030:                                return (-1);
1.22      itojun   1031:                        }
                   1032:                        *plenp = jumboplen;
                   1033:
                   1034:                        break;
1.35      itojun   1035:                default:                /* unknown option */
                   1036:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej  1037:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun   1038:                                goto bad;
                   1039:                        }
1.55      itojun   1040:                        optlen = ip6_unknown_opt(opt, m,
                   1041:                            erroff + opt - opthead);
                   1042:                        if (optlen == -1)
                   1043:                                return (-1);
1.35      itojun   1044:                        optlen += 2;
                   1045:                        break;
1.2       itojun   1046:                }
                   1047:        }
                   1048:
1.55      itojun   1049:        return (0);
1.2       itojun   1050:
                   1051:   bad:
                   1052:        m_freem(m);
1.55      itojun   1053:        return (-1);
1.2       itojun   1054: }
                   1055:
                   1056: /*
                   1057:  * Unknown option processing.
                   1058:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1059:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1060:  * is not continuous in order to return an ICMPv6 error.
                   1061:  */
                   1062: int
1.107     christos 1063: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun   1064: {
                   1065:        struct ip6_hdr *ip6;
                   1066:
1.35      itojun   1067:        switch (IP6OPT_TYPE(*optp)) {
                   1068:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1069:                return ((int)*(optp + 1));
1.35      itojun   1070:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1071:                m_freem(m);
1.58      itojun   1072:                return (-1);
1.35      itojun   1073:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116     thorpej  1074:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1075:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1076:                return (-1);
1.35      itojun   1077:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116     thorpej  1078:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1079:                ip6 = mtod(m, struct ip6_hdr *);
                   1080:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1081:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1082:                        m_freem(m);
                   1083:                else
                   1084:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1085:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1086:                return (-1);
1.2       itojun   1087:        }
                   1088:
                   1089:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1090:        return (-1);
1.2       itojun   1091: }
                   1092:
                   1093: /*
1.9       itojun   1094:  * Create the "control" list for this pcb.
                   1095:  *
                   1096:  * The routine will be called from upper layer handlers like tcp6_input().
                   1097:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1098:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1099:  * very first mbuf on the mbuf chain.
                   1100:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1101:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1102:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1103:  */
                   1104: void
1.107     christos 1105: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
                   1106:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1107: {
1.85      rpaulo   1108: #ifdef RFC2292
                   1109: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1110: #else
                   1111: #define IS2292(x, y)   (y)
                   1112: #endif
                   1113:
1.123     christos 1114:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP
                   1115: #ifdef SO_OTIMESTAMP
                   1116:            || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                   1117: #endif
                   1118:        ) {
1.2       itojun   1119:                struct timeval tv;
                   1120:
                   1121:                microtime(&tv);
1.123     christos 1122: #ifdef SO_OTIMESTAMP
                   1123:                if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
                   1124:                        struct timeval50 tv50;
                   1125:                        timeval_to_timeval50(&tv, &tv50);
                   1126:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1127:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1128:                } else
                   1129: #endif
1.97      christos 1130:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1131:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1132:                if (*mp)
                   1133:                        mp = &(*mp)->m_next;
                   1134:        }
1.87      rpaulo   1135:
                   1136:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1137:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1138:                return;
                   1139:
1.2       itojun   1140:        /* RFC 2292 sec. 5 */
1.35      itojun   1141:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1142:                struct in6_pktinfo pi6;
1.85      rpaulo   1143:
1.126     tsutsui  1144:                memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81      rpaulo   1145:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1146:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1147:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1148:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1149:                    sizeof(struct in6_pktinfo),
                   1150:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1151:                if (*mp)
                   1152:                        mp = &(*mp)->m_next;
                   1153:        }
1.85      rpaulo   1154:
1.2       itojun   1155:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1156:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1157:
1.97      christos 1158:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1159:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1160:                if (*mp)
                   1161:                        mp = &(*mp)->m_next;
                   1162:        }
                   1163:
                   1164:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1165:                u_int32_t flowinfo;
                   1166:                int tclass;
                   1167:
                   1168:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1169:                flowinfo >>= 20;
                   1170:
                   1171:                tclass = flowinfo & 0xff;
1.97      christos 1172:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1173:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1174:
1.2       itojun   1175:                if (*mp)
                   1176:                        mp = &(*mp)->m_next;
                   1177:        }
                   1178:
                   1179:        /*
1.75      itojun   1180:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1181:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1182:         * strict, since there might be some hop-by-hop options which can be
                   1183:         * returned to normal user.
1.85      rpaulo   1184:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1185:         */
1.75      itojun   1186:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1187:                /*
                   1188:                 * Check if a hop-by-hop options header is contatined in the
                   1189:                 * received packet, and if so, store the options as ancillary
                   1190:                 * data. Note that a hop-by-hop options header must be
                   1191:                 * just after the IPv6 header, which fact is assured through
                   1192:                 * the IPv6 input processing.
                   1193:                 */
1.78      christos 1194:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1195:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1196:                        struct ip6_hbh *hbh;
                   1197:                        int hbhlen;
1.62      itojun   1198:                        struct mbuf *ext;
1.9       itojun   1199:
1.62      itojun   1200:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1201:                            xip6->ip6_nxt);
1.62      itojun   1202:                        if (ext == NULL) {
1.116     thorpej  1203:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1204:                                return;
                   1205:                        }
1.62      itojun   1206:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1207:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1208:                        if (hbhlen != ext->m_len) {
                   1209:                                m_freem(ext);
1.116     thorpej  1210:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1211:                                return;
                   1212:                        }
1.2       itojun   1213:
                   1214:                        /*
                   1215:                         * XXX: We copy whole the header even if a jumbo
                   1216:                         * payload option is included, which option is to
                   1217:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1218:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1219:                         */
1.97      christos 1220:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1221:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1222:                            IPPROTO_IPV6);
1.2       itojun   1223:                        if (*mp)
                   1224:                                mp = &(*mp)->m_next;
1.62      itojun   1225:                        m_freem(ext);
1.2       itojun   1226:                }
                   1227:        }
                   1228:
                   1229:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1230:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1231:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1232:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1233:
                   1234:                /*
                   1235:                 * Search for destination options headers or routing
                   1236:                 * header(s) through the header chain, and stores each
                   1237:                 * header as ancillary data.
                   1238:                 * Note that the order of the headers remains in
                   1239:                 * the chain of ancillary data.
                   1240:                 */
1.86      rpaulo   1241:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1242:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1243:                        int elen;
1.62      itojun   1244:                        struct mbuf *ext = NULL;
1.9       itojun   1245:
1.62      itojun   1246:                        /*
                   1247:                         * if it is not an extension header, don't try to
                   1248:                         * pull it from the chain.
                   1249:                         */
                   1250:                        switch (nxt) {
                   1251:                        case IPPROTO_DSTOPTS:
                   1252:                        case IPPROTO_ROUTING:
                   1253:                        case IPPROTO_HOPOPTS:
                   1254:                        case IPPROTO_AH: /* is it possible? */
                   1255:                                break;
                   1256:                        default:
                   1257:                                goto loopend;
                   1258:                        }
                   1259:
                   1260:                        ext = ip6_pullexthdr(m, off, nxt);
                   1261:                        if (ext == NULL) {
1.116     thorpej  1262:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1263:                                return;
                   1264:                        }
1.62      itojun   1265:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1266:                        if (nxt == IPPROTO_AH)
                   1267:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1268:                        else
                   1269:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1270:                        if (elen != ext->m_len) {
                   1271:                                m_freem(ext);
1.116     thorpej  1272:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1273:                                return;
                   1274:                        }
1.57      thorpej  1275:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1276:
1.35      itojun   1277:                        switch (nxt) {
1.62      itojun   1278:                        case IPPROTO_DSTOPTS:
1.127     martin   1279:                                if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35      itojun   1280:                                        break;
                   1281:
1.97      christos 1282:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1283:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1284:                                    IPPROTO_IPV6);
1.35      itojun   1285:                                if (*mp)
                   1286:                                        mp = &(*mp)->m_next;
                   1287:                                break;
                   1288:
                   1289:                        case IPPROTO_ROUTING:
1.127     martin   1290:                                if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35      itojun   1291:                                        break;
                   1292:
1.97      christos 1293:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1294:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1295:                                    IPPROTO_IPV6);
1.35      itojun   1296:                                if (*mp)
                   1297:                                        mp = &(*mp)->m_next;
                   1298:                                break;
                   1299:
1.62      itojun   1300:                        case IPPROTO_HOPOPTS:
                   1301:                        case IPPROTO_AH: /* is it possible? */
                   1302:                                break;
                   1303:
1.35      itojun   1304:                        default:
                   1305:                                /*
1.62      itojun   1306:                                 * other cases have been filtered in the above.
                   1307:                                 * none will visit this case.  here we supply
                   1308:                                 * the code just in case (nxt overwritten or
                   1309:                                 * other cases).
1.35      itojun   1310:                                 */
1.62      itojun   1311:                                m_freem(ext);
1.35      itojun   1312:                                goto loopend;
                   1313:
1.2       itojun   1314:                        }
                   1315:
                   1316:                        /* proceed with the next header. */
1.9       itojun   1317:                        off += elen;
1.2       itojun   1318:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1319:                        ip6e = NULL;
                   1320:                        m_freem(ext);
                   1321:                        ext = NULL;
1.2       itojun   1322:                }
                   1323:          loopend:
1.62      itojun   1324:                ;
1.2       itojun   1325:        }
1.62      itojun   1326: }
1.85      rpaulo   1327: #undef IS2292
                   1328:
                   1329:
                   1330: void
1.95      dyoung   1331: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1332:     uint32_t *mtu)
1.85      rpaulo   1333: {
                   1334:        struct socket *so;
                   1335:        struct mbuf *m_mtu;
                   1336:        struct ip6_mtuinfo mtuctl;
                   1337:
                   1338:        so = in6p->in6p_socket;
                   1339:
                   1340:        if (mtu == NULL)
                   1341:                return;
                   1342:
                   1343: #ifdef DIAGNOSTIC
                   1344:        if (so == NULL)         /* I believe this is impossible */
                   1345:                panic("ip6_notify_pmtu: socket is NULL");
                   1346: #endif
                   1347:
                   1348:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1349:        mtuctl.ip6m_mtu = *mtu;
                   1350:        mtuctl.ip6m_addr = *dst;
                   1351:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1352:                return;
                   1353:
1.97      christos 1354:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1355:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1356:                return;
                   1357:
1.95      dyoung   1358:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1359:            == 0) {
                   1360:                m_freem(m_mtu);
                   1361:                /* XXX: should count statistics */
                   1362:        } else
                   1363:                sorwakeup(so);
                   1364:
                   1365:        return;
                   1366: }
1.62      itojun   1367:
                   1368: /*
                   1369:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1370:  * contains the result, or NULL on error.
                   1371:  */
                   1372: static struct mbuf *
1.107     christos 1373: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1374: {
                   1375:        struct ip6_ext ip6e;
                   1376:        size_t elen;
                   1377:        struct mbuf *n;
                   1378:
                   1379: #ifdef DIAGNOSTIC
                   1380:        switch (nxt) {
                   1381:        case IPPROTO_DSTOPTS:
                   1382:        case IPPROTO_ROUTING:
                   1383:        case IPPROTO_HOPOPTS:
                   1384:        case IPPROTO_AH: /* is it possible? */
                   1385:                break;
                   1386:        default:
                   1387:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1388:        }
1.62      itojun   1389: #endif
1.2       itojun   1390:
1.97      christos 1391:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1392:        if (nxt == IPPROTO_AH)
                   1393:                elen = (ip6e.ip6e_len + 2) << 2;
                   1394:        else
                   1395:                elen = (ip6e.ip6e_len + 1) << 3;
                   1396:
                   1397:        MGET(n, M_DONTWAIT, MT_DATA);
                   1398:        if (n && elen >= MLEN) {
                   1399:                MCLGET(n, M_DONTWAIT);
                   1400:                if ((n->m_flags & M_EXT) == 0) {
                   1401:                        m_free(n);
                   1402:                        n = NULL;
                   1403:                }
                   1404:        }
                   1405:        if (!n)
                   1406:                return NULL;
                   1407:
                   1408:        n->m_len = 0;
                   1409:        if (elen >= M_TRAILINGSPACE(n)) {
                   1410:                m_free(n);
                   1411:                return NULL;
                   1412:        }
                   1413:
1.97      christos 1414:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1415:        n->m_len = elen;
                   1416:        return n;
1.2       itojun   1417: }
                   1418:
                   1419: /*
                   1420:  * Get pointer to the previous header followed by the header
                   1421:  * currently processed.
                   1422:  * XXX: This function supposes that
                   1423:  *     M includes all headers,
                   1424:  *     the next header field and the header length field of each header
                   1425:  *     are valid, and
                   1426:  *     the sum of each header length equals to OFF.
                   1427:  * Because of these assumptions, this function must be called very
                   1428:  * carefully. Moreover, it will not be used in the near future when
                   1429:  * we develop `neater' mechanism to process extension headers.
                   1430:  */
1.58      itojun   1431: u_int8_t *
1.107     christos 1432: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1433: {
                   1434:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1435:
                   1436:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1437:                return (&ip6->ip6_nxt);
1.2       itojun   1438:        else {
                   1439:                int len, nxt;
                   1440:                struct ip6_ext *ip6e = NULL;
                   1441:
                   1442:                nxt = ip6->ip6_nxt;
                   1443:                len = sizeof(struct ip6_hdr);
                   1444:                while (len < off) {
1.97      christos 1445:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1446:
1.35      itojun   1447:                        switch (nxt) {
1.2       itojun   1448:                        case IPPROTO_FRAGMENT:
                   1449:                                len += sizeof(struct ip6_frag);
                   1450:                                break;
                   1451:                        case IPPROTO_AH:
                   1452:                                len += (ip6e->ip6e_len + 2) << 2;
                   1453:                                break;
                   1454:                        default:
                   1455:                                len += (ip6e->ip6e_len + 1) << 3;
                   1456:                                break;
                   1457:                        }
                   1458:                        nxt = ip6e->ip6e_nxt;
                   1459:                }
                   1460:                if (ip6e)
1.58      itojun   1461:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1462:                else
                   1463:                        return NULL;
1.18      itojun   1464:        }
                   1465: }
                   1466:
                   1467: /*
                   1468:  * get next header offset.  m will be retained.
                   1469:  */
                   1470: int
1.107     christos 1471: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1472: {
                   1473:        struct ip6_hdr ip6;
                   1474:        struct ip6_ext ip6e;
                   1475:        struct ip6_frag fh;
                   1476:
                   1477:        /* just in case */
                   1478:        if (m == NULL)
                   1479:                panic("ip6_nexthdr: m == NULL");
                   1480:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1481:                return -1;
                   1482:
                   1483:        switch (proto) {
                   1484:        case IPPROTO_IPV6:
1.83      rpaulo   1485:                /* do not chase beyond intermediate IPv6 headers */
                   1486:                if (off != 0)
                   1487:                        return -1;
1.18      itojun   1488:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1489:                        return -1;
1.97      christos 1490:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1491:                if (nxtp)
                   1492:                        *nxtp = ip6.ip6_nxt;
                   1493:                off += sizeof(ip6);
                   1494:                return off;
                   1495:
                   1496:        case IPPROTO_FRAGMENT:
                   1497:                /*
                   1498:                 * terminate parsing if it is not the first fragment,
                   1499:                 * it does not make sense to parse through it.
                   1500:                 */
                   1501:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1502:                        return -1;
1.97      christos 1503:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1504:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1505:                        return -1;
                   1506:                if (nxtp)
                   1507:                        *nxtp = fh.ip6f_nxt;
                   1508:                off += sizeof(struct ip6_frag);
                   1509:                return off;
                   1510:
                   1511:        case IPPROTO_AH:
                   1512:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1513:                        return -1;
1.97      christos 1514:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1515:                if (nxtp)
                   1516:                        *nxtp = ip6e.ip6e_nxt;
                   1517:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1518:                if (m->m_pkthdr.len < off)
                   1519:                        return -1;
1.18      itojun   1520:                return off;
                   1521:
                   1522:        case IPPROTO_HOPOPTS:
                   1523:        case IPPROTO_ROUTING:
                   1524:        case IPPROTO_DSTOPTS:
                   1525:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1526:                        return -1;
1.97      christos 1527:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1528:                if (nxtp)
                   1529:                        *nxtp = ip6e.ip6e_nxt;
                   1530:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1531:                if (m->m_pkthdr.len < off)
                   1532:                        return -1;
1.18      itojun   1533:                return off;
                   1534:
                   1535:        case IPPROTO_NONE:
                   1536:        case IPPROTO_ESP:
                   1537:        case IPPROTO_IPCOMP:
                   1538:                /* give up */
                   1539:                return -1;
                   1540:
                   1541:        default:
                   1542:                return -1;
                   1543:        }
                   1544: }
                   1545:
                   1546: /*
                   1547:  * get offset for the last header in the chain.  m will be kept untainted.
                   1548:  */
                   1549: int
1.107     christos 1550: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1551: {
                   1552:        int newoff;
                   1553:        int nxt;
                   1554:
                   1555:        if (!nxtp) {
                   1556:                nxt = -1;
                   1557:                nxtp = &nxt;
                   1558:        }
1.86      rpaulo   1559:        for (;;) {
1.18      itojun   1560:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1561:                if (newoff < 0)
                   1562:                        return off;
                   1563:                else if (newoff < off)
                   1564:                        return -1;      /* invalid */
                   1565:                else if (newoff == off)
                   1566:                        return newoff;
                   1567:
                   1568:                off = newoff;
                   1569:                proto = *nxtp;
1.2       itojun   1570:        }
                   1571: }
                   1572:
1.81      rpaulo   1573: struct m_tag *
1.107     christos 1574: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1575: {
                   1576:        struct m_tag *mtag;
                   1577:
                   1578:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1579:        if (!mtag) {
                   1580:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1581:                    M_NOWAIT);
                   1582:                if (mtag) {
                   1583:                        m_tag_prepend(m, mtag);
1.124     cegger   1584:                        memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81      rpaulo   1585:                }
                   1586:        }
                   1587:        return mtag;
                   1588: }
                   1589:
                   1590: struct m_tag *
1.107     christos 1591: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1592: {
                   1593:        struct m_tag *mtag;
                   1594:
                   1595:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1596:        return mtag;
                   1597: }
                   1598:
                   1599: void
1.107     christos 1600: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1601: {
                   1602:        struct m_tag *mtag;
                   1603:
                   1604:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1605:        if (mtag)
                   1606:                m_tag_delete(m, mtag);
                   1607: }
                   1608:
1.98      liamjfoy 1609: #ifdef GATEWAY
                   1610: /*
                   1611:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1612:  * we could reduce this value, call ip6flow_reap();
                   1613:  */
                   1614: static int
1.101     liamjfoy 1615: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98      liamjfoy 1616: {
1.121     simonb   1617:        int error;
1.98      liamjfoy 1618:
1.121     simonb   1619:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1620:        if (error || newp == NULL)
                   1621:                return (error);
1.98      liamjfoy 1622:
1.121     simonb   1623:        mutex_enter(softnet_lock);
1.122     matt     1624:        KERNEL_LOCK(1, NULL);
1.120     matt     1625:
1.121     simonb   1626:        ip6flow_reap(0);
1.120     matt     1627:
                   1628:        KERNEL_UNLOCK_ONE(NULL);
1.121     simonb   1629:        mutex_exit(softnet_lock);
1.98      liamjfoy 1630:
1.121     simonb   1631:        return (0);
1.98      liamjfoy 1632: }
1.99      liamjfoy 1633:
                   1634: static int
                   1635: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1636: {
                   1637:        int error, tmp;
                   1638:        struct sysctlnode node;
                   1639:
                   1640:        node = *rnode;
                   1641:        tmp = ip6_hashsize;
                   1642:        node.sysctl_data = &tmp;
                   1643:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1644:        if (error || newp == NULL)
                   1645:                return (error);
                   1646:
                   1647:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1648:                /*
                   1649:                 * Can only fail due to malloc()
                   1650:                 */
1.120     matt     1651:                mutex_enter(softnet_lock);
1.122     matt     1652:                KERNEL_LOCK(1, NULL);
1.120     matt     1653:
                   1654:                error = ip6flow_invalidate_all(tmp);
                   1655:
                   1656:                KERNEL_UNLOCK_ONE(NULL);
                   1657:                mutex_exit(softnet_lock);
1.99      liamjfoy 1658:        } else {
                   1659:                /*
                   1660:                 * EINVAL if not a power of 2
1.121     simonb   1661:                 */
1.120     matt     1662:                error = EINVAL;
1.99      liamjfoy 1663:        }
                   1664:
1.120     matt     1665:        return error;
1.99      liamjfoy 1666: }
1.98      liamjfoy 1667: #endif /* GATEWAY */
                   1668:
1.2       itojun   1669: /*
                   1670:  * System control for IP6
                   1671:  */
                   1672:
1.120     matt     1673: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2       itojun   1674:        0,              0,              0,              0,
                   1675:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1676:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1677:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1678:        0,              0,              0,              0,
                   1679:        ENOPROTOOPT
                   1680: };
                   1681:
1.116     thorpej  1682: static int
                   1683: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
                   1684: {
                   1685:
1.119     thorpej  1686:        return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116     thorpej  1687: }
                   1688:
1.128     pooka    1689: static void
                   1690: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2       itojun   1691: {
1.85      rpaulo   1692: #ifdef RFC2292
                   1693: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1694: #else
                   1695: #define IS2292(x, y)   (y)
                   1696: #endif
1.26      itojun   1697:
1.73      atatat   1698:        sysctl_createv(clog, 0, NULL, NULL,
                   1699:                       CTLFLAG_PERMANENT,
1.70      atatat   1700:                       CTLTYPE_NODE, "net", NULL,
                   1701:                       NULL, 0, NULL, 0,
                   1702:                       CTL_NET, CTL_EOL);
1.73      atatat   1703:        sysctl_createv(clog, 0, NULL, NULL,
                   1704:                       CTLFLAG_PERMANENT,
1.74      atatat   1705:                       CTLTYPE_NODE, "inet6",
                   1706:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1707:                       NULL, 0, NULL, 0,
                   1708:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1709:        sysctl_createv(clog, 0, NULL, NULL,
                   1710:                       CTLFLAG_PERMANENT,
1.74      atatat   1711:                       CTLTYPE_NODE, "ip6",
                   1712:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1713:                       NULL, 0, NULL, 0,
                   1714:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1715:
1.73      atatat   1716:        sysctl_createv(clog, 0, NULL, NULL,
                   1717:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1718:                       CTLTYPE_INT, "forwarding",
                   1719:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1720:                       NULL, 0, &ip6_forwarding, 0,
                   1721:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1722:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1723:        sysctl_createv(clog, 0, NULL, NULL,
                   1724:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1725:                       CTLTYPE_INT, "redirect",
                   1726:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1727:                       NULL, 0, &ip6_sendredirects, 0,
                   1728:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1729:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1730:        sysctl_createv(clog, 0, NULL, NULL,
                   1731:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1732:                       CTLTYPE_INT, "hlim",
                   1733:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1734:                       NULL, 0, &ip6_defhlim, 0,
                   1735:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1736:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1737: #ifdef notyet
1.73      atatat   1738:        sysctl_createv(clog, 0, NULL, NULL,
                   1739:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1740:                       CTLTYPE_INT, "mtu", NULL,
                   1741:                       NULL, 0, &, 0,
                   1742:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1743:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1744: #endif
                   1745: #ifdef __no_idea__
1.73      atatat   1746:        sysctl_createv(clog, 0, NULL, NULL,
                   1747:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1748:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1749:                       NULL, 0, &?, 0,
                   1750:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1751:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1752:        sysctl_createv(clog, 0, NULL, NULL,
                   1753:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1754:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1755:                       NULL, 0, &?, sizeof(?),
                   1756:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1757:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1758:        sysctl_createv(clog, 0, NULL, NULL,
                   1759:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1760:                       CTLTYPE_?, "mrtproto", NULL,
                   1761:                       NULL, 0, &?, sizeof(?),
                   1762:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1763:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1764: #endif
1.73      atatat   1765:        sysctl_createv(clog, 0, NULL, NULL,
                   1766:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1767:                       CTLTYPE_INT, "maxfragpackets",
                   1768:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1769:                                    "for reassembly"),
1.70      atatat   1770:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1771:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1772:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1773: #ifdef __no_idea__
1.73      atatat   1774:        sysctl_createv(clog, 0, NULL, NULL,
                   1775:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1776:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1777:                       NULL, 0, &?, 0,
                   1778:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1779:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1780:        sysctl_createv(clog, 0, NULL, NULL,
                   1781:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1782:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1783:                       NULL, 0, &?, 0,
                   1784:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1785:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1786: #endif
1.73      atatat   1787:        sysctl_createv(clog, 0, NULL, NULL,
                   1788:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1789:                       CTLTYPE_INT, "accept_rtadv",
                   1790:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1791:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1792:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1793:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1794:        sysctl_createv(clog, 0, NULL, NULL,
                   1795:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.129.4.1  rmind    1796:                       CTLTYPE_INT, "rtadv_maxroutes",
                   1797:                       SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"),
                   1798:                       NULL, 0, &ip6_rtadv_maxroutes, 0,
                   1799:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1800:                       IPV6CTL_RTADV_MAXROUTES, CTL_EOL);
                   1801:        sysctl_createv(clog, 0, NULL, NULL,
                   1802:                       CTLFLAG_PERMANENT,
                   1803:                       CTLTYPE_INT, "rtadv_numroutes",
                   1804:                       SYSCTL_DESCR("Current number of routes accepted via router advertisements"),
                   1805:                       NULL, 0, &nd6_numroutes, 0,
                   1806:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1807:                       IPV6CTL_RTADV_NUMROUTES, CTL_EOL);
                   1808:        sysctl_createv(clog, 0, NULL, NULL,
                   1809:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1810:                       CTLTYPE_INT, "keepfaith",
                   1811:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1812:                       NULL, 0, &ip6_keepfaith, 0,
                   1813:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1814:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1815:        sysctl_createv(clog, 0, NULL, NULL,
                   1816:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1817:                       CTLTYPE_INT, "log_interval",
                   1818:                       SYSCTL_DESCR("Minumum interval between logging "
                   1819:                                    "unroutable packets"),
1.70      atatat   1820:                       NULL, 0, &ip6_log_interval, 0,
                   1821:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1822:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1823:        sysctl_createv(clog, 0, NULL, NULL,
                   1824:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1825:                       CTLTYPE_INT, "hdrnestlimit",
                   1826:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1827:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1828:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1829:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1830:        sysctl_createv(clog, 0, NULL, NULL,
                   1831:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1832:                       CTLTYPE_INT, "dad_count",
                   1833:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1834:                                    "probes to send"),
1.70      atatat   1835:                       NULL, 0, &ip6_dad_count, 0,
                   1836:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1837:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1838:        sysctl_createv(clog, 0, NULL, NULL,
                   1839:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1840:                       CTLTYPE_INT, "auto_flowlabel",
                   1841:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1842:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1843:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1844:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1845:        sysctl_createv(clog, 0, NULL, NULL,
                   1846:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1847:                       CTLTYPE_INT, "defmcasthlim",
                   1848:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1849:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1850:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1851:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1852: #if NGIF > 0
1.73      atatat   1853:        sysctl_createv(clog, 0, NULL, NULL,
                   1854:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1855:                       CTLTYPE_INT, "gifhlim",
                   1856:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1857:                       NULL, 0, &ip6_gif_hlim, 0,
                   1858:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1859:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1860: #endif /* NGIF */
1.73      atatat   1861:        sysctl_createv(clog, 0, NULL, NULL,
                   1862:                       CTLFLAG_PERMANENT,
1.74      atatat   1863:                       CTLTYPE_STRING, "kame_version",
                   1864:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1865:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1866:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1867:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1868:        sysctl_createv(clog, 0, NULL, NULL,
                   1869:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1870:                       CTLTYPE_INT, "use_deprecated",
                   1871:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1872:                                    "source addresses"),
1.70      atatat   1873:                       NULL, 0, &ip6_use_deprecated, 0,
                   1874:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1875:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1876:        sysctl_createv(clog, 0, NULL, NULL,
                   1877:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1878:                       CTLTYPE_INT, "rr_prune", NULL,
                   1879:                       NULL, 0, &ip6_rr_prune, 0,
                   1880:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1881:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1882:        sysctl_createv(clog, 0, NULL, NULL,
                   1883:                       CTLFLAG_PERMANENT
1.70      atatat   1884: #ifndef INET6_BINDV6ONLY
1.73      atatat   1885:                       |CTLFLAG_READWRITE,
1.70      atatat   1886: #endif
1.74      atatat   1887:                       CTLTYPE_INT, "v6only",
                   1888:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1889:                                    "to PF_INET sockets"),
1.70      atatat   1890:                       NULL, 0, &ip6_v6only, 0,
                   1891:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1892:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1893:        sysctl_createv(clog, 0, NULL, NULL,
                   1894:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1895:                       CTLTYPE_INT, "anonportmin",
                   1896:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1897:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1898:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1899:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1900:        sysctl_createv(clog, 0, NULL, NULL,
                   1901:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1902:                       CTLTYPE_INT, "anonportmax",
                   1903:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1904:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1905:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1906:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1907: #ifndef IPNOPRIVPORTS
1.73      atatat   1908:        sysctl_createv(clog, 0, NULL, NULL,
                   1909:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1910:                       CTLTYPE_INT, "lowportmin",
                   1911:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1912:                                    "to assign"),
1.70      atatat   1913:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1914:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1915:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1916:        sysctl_createv(clog, 0, NULL, NULL,
                   1917:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1918:                       CTLTYPE_INT, "lowportmax",
                   1919:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1920:                                    "to assign"),
1.70      atatat   1921:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1922:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1923:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1924: #endif /* IPNOPRIVPORTS */
1.73      atatat   1925:        sysctl_createv(clog, 0, NULL, NULL,
                   1926:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1927:                       CTLTYPE_INT, "use_tempaddr",
                   1928:                       SYSCTL_DESCR("Use temporary address"),
                   1929:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1930:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1931:                       CTL_CREATE, CTL_EOL);
                   1932:        sysctl_createv(clog, 0, NULL, NULL,
                   1933:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1934:                       CTLTYPE_INT, "temppltime",
                   1935:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1936:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1937:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1938:                       CTL_CREATE, CTL_EOL);
                   1939:        sysctl_createv(clog, 0, NULL, NULL,
                   1940:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1941:                       CTLTYPE_INT, "tempvltime",
                   1942:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1943:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1944:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1945:                       CTL_CREATE, CTL_EOL);
                   1946:        sysctl_createv(clog, 0, NULL, NULL,
                   1947:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1948:                       CTLTYPE_INT, "maxfrags",
                   1949:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1950:                       NULL, 0, &ip6_maxfrags, 0,
                   1951:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1952:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1953:        sysctl_createv(clog, 0, NULL, NULL,
                   1954:                       CTLFLAG_PERMANENT,
                   1955:                       CTLTYPE_STRUCT, "stats",
                   1956:                       SYSCTL_DESCR("IPv6 statistics"),
1.116     thorpej  1957:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1958:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1959:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1960:        sysctl_createv(clog, 0, NULL, NULL,
                   1961:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1962:                       CTLTYPE_INT, "use_defaultzone",
                   1963:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1964:                       NULL, 0, &ip6_use_defzone, 0,
                   1965:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1966:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1967:        sysctl_createv(clog, 0, NULL, NULL,
                   1968:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1969:                       CTLTYPE_INT, "mcast_pmtu",
                   1970:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1971:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1972:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1973:                       CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1974: #ifdef GATEWAY
                   1975:        sysctl_createv(clog, 0, NULL, NULL,
                   1976:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1977:                        CTLTYPE_INT, "maxflows",
                   1978:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1979:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1980:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1981:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1982:        sysctl_createv(clog, 0, NULL, NULL,
                   1983:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1984:                        CTLTYPE_INT, "hashsize",
                   1985:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1986:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1987:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1988:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1989: #endif
1.2       itojun   1990: }
1.116     thorpej  1991:
                   1992: void
                   1993: ip6_statinc(u_int stat)
                   1994: {
                   1995:
                   1996:        KASSERT(stat < IP6_NSTATS);
                   1997:        IP6_STATINC(stat);
                   1998: }

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