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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.204.2.1

1.204.2.1! christos    1: /*     $NetBSD: ip6_input.c,v 1.208 2019/05/13 07:47:59 ozaki-r Exp $  */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
1.65      agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.204.2.1! christos   65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.208 2019/05/13 07:47:59 ozaki-r Exp $");
1.2       itojun     66:
1.152     pooka      67: #ifdef _KERNEL_OPT
1.129     joerg      68: #include "opt_gateway.h"
1.2       itojun     69: #include "opt_inet.h"
1.85      rpaulo     70: #include "opt_inet6.h"
1.4       thorpej    71: #include "opt_ipsec.h"
1.169     ozaki-r    72: #include "opt_net_mpsafe.h"
1.152     pooka      73: #endif
1.2       itojun     74:
                     75: #include <sys/param.h>
                     76: #include <sys/systm.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>
1.133     tls        88: #include <sys/cprng.h>
1.167     ozaki-r    89: #include <sys/percpu.h>
1.2       itojun     90:
                     91: #include <net/if.h>
                     92: #include <net/if_types.h>
                     93: #include <net/if_dl.h>
                     94: #include <net/route.h>
1.148     rmind      95: #include <net/pktqueue.h>
1.15      darrenr    96: #include <net/pfil.h>
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>
1.148     rmind     102: #include <netinet/ip_var.h>
1.9       itojun    103: #include <netinet/ip_icmp.h>
1.45      itojun    104: #endif /* INET */
1.14      itojun    105: #include <netinet/ip6.h>
1.140     christos  106: #include <netinet/portalgo.h>
1.2       itojun    107: #include <netinet6/in6_var.h>
1.11      itojun    108: #include <netinet6/ip6_var.h>
1.116     thorpej   109: #include <netinet6/ip6_private.h>
1.2       itojun    110: #include <netinet6/in6_pcb.h>
1.14      itojun    111: #include <netinet/icmp6.h>
1.81      rpaulo    112: #include <netinet6/scope6_var.h>
1.2       itojun    113: #include <netinet6/in6_ifattach.h>
                    114: #include <netinet6/nd6.h>
                    115:
1.142     christos  116: #ifdef IPSEC
1.94      degroote  117: #include <netipsec/ipsec.h>
                    118: #include <netipsec/ipsec6.h>
                    119: #include <netipsec/key.h>
1.142     christos  120: #endif /* IPSEC */
1.94      degroote  121:
1.2       itojun    122: #include <netinet6/ip6protosw.h>
                    123:
                    124: #include "faith.h"
                    125:
                    126: extern struct domain inet6domain;
                    127:
                    128: u_char ip6_protox[IPPROTO_MAX];
1.148     rmind     129: pktqueue_t *ip6_pktq __read_mostly;
1.2       itojun    130:
1.143     rmind     131: pfil_head_t *inet6_pfil_hook;
1.29      thorpej   132:
1.116     thorpej   133: percpu_t *ip6stat_percpu;
1.2       itojun    134:
1.167     ozaki-r   135: percpu_t *ip6_forward_rt_percpu __cacheline_aligned;
                    136:
1.156     ozaki-r   137: static void ip6_init2(void);
1.148     rmind     138: static void ip6intr(void *);
1.199     maxv      139: static bool ip6_badaddr(struct ip6_hdr *);
1.112     dyoung    140: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    141:
1.136     drochner  142: static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
1.189     maxv      143:     u_int32_t *);
1.111     dyoung    144: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128     pooka     145: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2       itojun    146:
1.169     ozaki-r   147: #ifdef NET_MPSAFE
                    148: #define        SOFTNET_LOCK()          mutex_enter(softnet_lock)
                    149: #define        SOFTNET_UNLOCK()        mutex_exit(softnet_lock)
                    150: #else
                    151: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    152: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
                    153: #endif
                    154:
1.2       itojun    155: /*
                    156:  * IP6 initialization: fill in IP6 protocol switch table.
                    157:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    158:  */
                    159: void
1.114     matt      160: ip6_init(void)
1.2       itojun    161: {
1.78      christos  162:        const struct ip6protosw *pr;
1.35      itojun    163:        int i;
1.2       itojun    164:
1.163     ozaki-r   165:        in6_init();
1.162     ozaki-r   166:
1.128     pooka     167:        sysctl_net_inet6_ip6_setup(NULL);
1.78      christos  168:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    169:        if (pr == 0)
                    170:                panic("ip6_init");
                    171:        for (i = 0; i < IPPROTO_MAX; i++)
                    172:                ip6_protox[i] = pr - inet6sw;
1.78      christos  173:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    174:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    175:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    176:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    177:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
1.148     rmind     178:
1.149     ozaki-r   179:        ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL);
1.148     rmind     180:        KASSERT(ip6_pktq != NULL);
                    181:
1.81      rpaulo    182:        scope6_init();
                    183:        addrsel_policy_init();
1.2       itojun    184:        nd6_init();
                    185:        frag6_init();
1.133     tls       186:        ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    187:
1.156     ozaki-r   188:        ip6_init2();
1.98      liamjfoy  189: #ifdef GATEWAY
1.99      liamjfoy  190:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  191: #endif
1.29      thorpej   192:        /* Register our Packet Filter hook. */
1.143     rmind     193:        inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6);
                    194:        KASSERT(inet6_pfil_hook != NULL);
1.116     thorpej   195:
                    196:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.167     ozaki-r   197:        ip6_forward_rt_percpu = percpu_alloc(sizeof(struct route));
1.2       itojun    198: }
                    199:
                    200: static void
1.156     ozaki-r   201: ip6_init2(void)
1.2       itojun    202: {
                    203:
1.186     maxv      204:        /* timer for regeneration of temporary addresses randomize ID */
1.118     ad        205:        callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83      rpaulo    206:        callout_reset(&in6_tmpaddrtimer_ch,
                    207:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    208:                       ip6_temp_regen_advance) * hz,
                    209:                      in6_tmpaddrtimer, NULL);
1.2       itojun    210: }
                    211:
                    212: /*
                    213:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    214:  */
1.148     rmind     215: static void
                    216: ip6intr(void *arg __unused)
1.2       itojun    217: {
                    218:        struct mbuf *m;
                    219:
1.193     ozaki-r   220:        SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.148     rmind     221:        while ((m = pktq_dequeue(ip6_pktq)) != NULL) {
1.160     ozaki-r   222:                struct psref psref;
                    223:                struct ifnet *rcvif = m_get_rcvif_psref(m, &psref);
1.148     rmind     224:
1.160     ozaki-r   225:                if (rcvif == NULL) {
                    226:                        m_freem(m);
                    227:                        continue;
                    228:                }
1.148     rmind     229:                /*
                    230:                 * Drop the packet if IPv6 is disabled on the interface.
                    231:                 */
1.160     ozaki-r   232:                if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    233:                        m_put_rcvif_psref(rcvif, &psref);
1.83      rpaulo    234:                        m_freem(m);
1.148     rmind     235:                        continue;
1.83      rpaulo    236:                }
1.160     ozaki-r   237:                ip6_input(m, rcvif);
                    238:                m_put_rcvif_psref(rcvif, &psref);
1.2       itojun    239:        }
1.193     ozaki-r   240:        SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.2       itojun    241: }
                    242:
                    243: void
1.160     ozaki-r   244: ip6_input(struct mbuf *m, struct ifnet *rcvif)
1.2       itojun    245: {
1.9       itojun    246:        struct ip6_hdr *ip6;
1.105     dyoung    247:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    248:        u_int32_t plen;
1.5       itojun    249:        u_int32_t rtalert = ~0;
1.188     maxv      250:        int nxt, ours = 0, rh_present = 0, frg_present;
1.9       itojun    251:        struct ifnet *deliverifp = NULL;
1.64      itojun    252:        int srcrt = 0;
1.171     ozaki-r   253:        struct rtentry *rt = NULL;
1.105     dyoung    254:        union {
                    255:                struct sockaddr         dst;
                    256:                struct sockaddr_in6     dst6;
                    257:        } u;
1.167     ozaki-r   258:        struct route *ro;
1.2       itojun    259:
1.186     maxv      260:        KASSERT(rcvif != NULL);
                    261:
1.2       itojun    262:        /*
1.81      rpaulo    263:         * make sure we don't have onion peering information into m_tag.
                    264:         */
                    265:        ip6_delaux(m);
                    266:
                    267:        /*
1.44      itojun    268:         * mbuf statistics
1.2       itojun    269:         */
                    270:        if (m->m_flags & M_EXT) {
                    271:                if (m->m_next)
1.116     thorpej   272:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    273:                else
1.116     thorpej   274:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    275:        } else {
1.115     thorpej   276: #define M2MMAX 32
1.2       itojun    277:                if (m->m_next) {
1.159     ozaki-r   278:                        if (m->m_flags & M_LOOP)
1.116     thorpej   279:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.159     ozaki-r   280:                        else if (rcvif->if_index < M2MMAX)
                    281:                                IP6_STATINC(IP6_STAT_M2M + rcvif->if_index);
                    282:                        else
1.116     thorpej   283:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    284:                } else
1.116     thorpej   285:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    286: #undef M2MMAX
1.2       itojun    287:        }
                    288:
1.159     ozaki-r   289:        in6_ifstat_inc(rcvif, ifs6_in_receive);
1.116     thorpej   290:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    291:
1.57      thorpej   292:        /*
                    293:         * If the IPv6 header is not aligned, slurp it up into a new
                    294:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    295:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   296:         * IPv6 header is in the first mbuf of the chain.
                    297:         */
1.97      christos  298:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   299:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
1.186     maxv      300:                    (max_linkhdr + 3) & ~3)) == NULL) {
1.57      thorpej   301:                        /* XXXJRT new stat, please */
1.116     thorpej   302:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.159     ozaki-r   303:                        in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
1.57      thorpej   304:                        return;
                    305:                }
                    306:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
1.55      itojun    307:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116     thorpej   308:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.159     ozaki-r   309:                        in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
1.9       itojun    310:                        return;
                    311:                }
1.2       itojun    312:        }
                    313:
                    314:        ip6 = mtod(m, struct ip6_hdr *);
                    315:
                    316:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116     thorpej   317:                IP6_STATINC(IP6_STAT_BADVERS);
1.159     ozaki-r   318:                in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
1.2       itojun    319:                goto bad;
                    320:        }
1.15      darrenr   321:
1.199     maxv      322:        if (ip6_badaddr(ip6)) {
1.194     maxv      323:                IP6_STATINC(IP6_STAT_BADSCOPE);
                    324:                in6_ifstat_inc(rcvif, ifs6_in_addrerr);
                    325:                goto bad;
                    326:        }
                    327:
                    328:        /*
1.98      liamjfoy  329:         * Assume that we can create a fast-forward IP flow entry
                    330:         * based on this packet.
                    331:         */
                    332:        m->m_flags |= M_CANFASTFWD;
                    333:
1.15      darrenr   334:        /*
                    335:         * Run through list of hooks for input packets.  If there are any
                    336:         * filters which require that additional packets in the flow are
                    337:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    338:         * Note that filters must _never_ set this flag, as another filter
                    339:         * in the list may have previously cleared it.
1.196     maxv      340:         *
                    341:         * Don't call hooks if the packet has already been processed by
                    342:         * IPsec (encapsulated, tunnel mode).
1.39      itojun    343:         */
1.142     christos  344: #if defined(IPSEC)
1.204.2.1! christos  345:        if (!ipsec_used || !ipsec_skip_pfil(m))
1.39      itojun    346: #else
                    347:        if (1)
                    348: #endif
                    349:        {
1.64      itojun    350:                struct in6_addr odst;
1.204.2.1! christos  351:                int error;
1.64      itojun    352:
                    353:                odst = ip6->ip6_dst;
1.204.2.1! christos  354:                error = pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN);
        !           355:                if (error != 0 || m == NULL) {
        !           356:                        IP6_STATINC(IP6_STAT_PFILDROP_IN);
1.39      itojun    357:                        return;
1.204.2.1! christos  358:                }
1.203     maxv      359:                KASSERT(m->m_len >= sizeof(struct ip6_hdr));
1.39      itojun    360:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    361:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    362:        }
1.15      darrenr   363:
1.116     thorpej   364:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    365:
1.30      thorpej   366: #ifdef ALTQ
1.169     ozaki-r   367:        if (altq_input != NULL) {
                    368:                SOFTNET_LOCK();
                    369:                if ((*altq_input)(m, AF_INET6) == 0) {
                    370:                        SOFTNET_UNLOCK();
                    371:                        /* packet is dropped by traffic conditioner */
                    372:                        return;
                    373:                }
                    374:                SOFTNET_UNLOCK();
1.9       itojun    375:        }
                    376: #endif
                    377:
1.2       itojun    378:        /*
1.82      yamt      379:         * Disambiguate address scope zones (if there is ambiguity).
                    380:         * We first make sure that the original source or destination address
                    381:         * is not in our internal form for scoped addresses.  Such addresses
                    382:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    383:         * to the usage conflict.
                    384:         * in6_setscope() then also checks and rejects the cases where src or
                    385:         * dst are the loopback address and the receiving interface
1.186     maxv      386:         * is not loopback.
1.82      yamt      387:         */
1.88      bouyer    388:        if (__predict_false(
                    389:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    390:                goto bad;
                    391:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      392:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116     thorpej   393:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      394:                goto bad;
                    395:        }
1.159     ozaki-r   396:        if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
                    397:            in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
1.116     thorpej   398:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      399:                goto bad;
                    400:        }
                    401:
1.171     ozaki-r   402:        ro = percpu_getref(ip6_forward_rt_percpu);
1.186     maxv      403:
1.82      yamt      404:        /*
1.2       itojun    405:         * Multicast check
                    406:         */
                    407:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1.176     ozaki-r   408:                bool ingroup;
1.9       itojun    409:
1.159     ozaki-r   410:                in6_ifstat_inc(rcvif, ifs6_in_mcast);
1.2       itojun    411:                /*
                    412:                 * See if we belong to the destination multicast group on the
                    413:                 * arrival interface.
                    414:                 */
1.176     ozaki-r   415:                ingroup = in6_multi_group(&ip6->ip6_dst, rcvif);
1.186     maxv      416:                if (ingroup) {
1.2       itojun    417:                        ours = 1;
1.186     maxv      418:                } else if (!ip6_mrouter) {
1.116     thorpej   419:                        uint64_t *ip6s = IP6_STAT_GETREF();
                    420:                        ip6s[IP6_STAT_NOTMEMBER]++;
                    421:                        ip6s[IP6_STAT_CANTFORWARD]++;
                    422:                        IP6_STAT_PUTREF();
1.159     ozaki-r   423:                        in6_ifstat_inc(rcvif, ifs6_in_discard);
1.171     ozaki-r   424:                        goto bad_unref;
1.2       itojun    425:                }
1.159     ozaki-r   426:                deliverifp = rcvif;
1.2       itojun    427:                goto hbhcheck;
                    428:        }
                    429:
1.105     dyoung    430:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    431:
1.2       itojun    432:        /*
1.186     maxv      433:         * Unicast check
1.2       itojun    434:         */
1.167     ozaki-r   435:        rt = rtcache_lookup2(ro, &u.dst, 1, &hit);
1.105     dyoung    436:        if (hit)
1.116     thorpej   437:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     438:        else
1.116     thorpej   439:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    440:
1.2       itojun    441:        /*
                    442:         * Accept the packet if the forwarding interface to the destination
1.186     maxv      443:         * (according to the routing table) is the loopback interface,
1.2       itojun    444:         * unless the associated route has a gateway.
1.186     maxv      445:         *
                    446:         * We don't explicitly match ip6_dst against an interface here. It
                    447:         * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be
                    448:         * IFT_LOOP if the packet is for us.
                    449:         *
1.2       itojun    450:         * Note that this approach causes to accept a packet if there is a
                    451:         * route to the loopback interface for the destination of the packet.
                    452:         * But we think it's even useful in some situations, e.g. when using
                    453:         * a special daemon which wants to intercept the packet.
                    454:         */
1.105     dyoung    455:        if (rt != NULL &&
                    456:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    457:            rt->rt_ifp->if_type == IFT_LOOP) {
                    458:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.184     roy       459:                int addrok;
                    460:
1.2       itojun    461:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    462:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    463:                /*
                    464:                 * packets to a tentative, duplicated, or somehow invalid
                    465:                 * address must not be accepted.
                    466:                 */
1.184     roy       467:                if (ia6->ia6_flags & IN6_IFF_NOTREADY)
                    468:                        addrok = 0;
                    469:                else if (ia6->ia6_flags & IN6_IFF_DETACHED &&
                    470:                    !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src))
                    471:                {
                    472:                        /* Allow internal traffic to DETACHED addresses */
                    473:                        struct sockaddr_in6 sin6;
                    474:                        int s;
                    475:
                    476:                        memset(&sin6, 0, sizeof(sin6));
                    477:                        sin6.sin6_family = AF_INET6;
                    478:                        sin6.sin6_len = sizeof(sin6);
                    479:                        sin6.sin6_addr = ip6->ip6_src;
                    480:                        s = pserialize_read_enter();
                    481:                        addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL);
                    482:                        pserialize_read_exit(s);
                    483:                } else
1.185     kre       484:                        addrok = 1;
1.184     roy       485:                if (addrok) {
1.24      itojun    486:                        /* this address is ready */
1.2       itojun    487:                        ours = 1;
1.9       itojun    488:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    489:                        goto hbhcheck;
                    490:                } else {
1.24      itojun    491:                        /* address is not ready, so discard the packet. */
1.172     ryo       492:                        char ip6bufs[INET6_ADDRSTRLEN];
                    493:                        char ip6bufd[INET6_ADDRSTRLEN];
1.157     ozaki-r   494:                        nd6log(LOG_INFO, "packet to an unready address %s->%s\n",
1.173     christos  495:                            IN6_PRINT(ip6bufs, &ip6->ip6_src),
                    496:                            IN6_PRINT(ip6bufd, &ip6->ip6_dst));
1.24      itojun    497:
1.171     ozaki-r   498:                        goto bad_unref;
1.2       itojun    499:                }
                    500:        }
                    501:
                    502:        /*
1.55      itojun    503:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    504:         */
                    505: #if defined(NFAITH) && 0 < NFAITH
                    506:        if (ip6_keepfaith) {
1.105     dyoung    507:                if (rt != NULL && rt->rt_ifp != NULL &&
                    508:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    509:                        /* XXX do we need more sanity checks? */
                    510:                        ours = 1;
1.105     dyoung    511:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    512:                        goto hbhcheck;
                    513:                }
                    514:        }
                    515: #endif
                    516:
1.2       itojun    517:        /*
                    518:         * Now there is no reason to process the packet if it's not our own
                    519:         * and we're not a router.
                    520:         */
                    521:        if (!ip6_forwarding) {
1.116     thorpej   522:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.159     ozaki-r   523:                in6_ifstat_inc(rcvif, ifs6_in_discard);
1.171     ozaki-r   524:                goto bad_unref;
1.2       itojun    525:        }
                    526:
1.186     maxv      527: hbhcheck:
1.2       itojun    528:        /*
1.186     maxv      529:         * Record address information into m_tag, if we don't have one yet.
                    530:         * Note that we are unable to record it, if the address is not listed
1.81      rpaulo    531:         * as our interface address (e.g. multicast addresses, addresses
                    532:         * within FAITH prefixes and such).
                    533:         */
1.111     dyoung    534:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    535:                struct in6_ifaddr *ia6;
1.165     ozaki-r   536:                int s = pserialize_read_enter();
1.81      rpaulo    537:
                    538:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.165     ozaki-r   539:                /* Depends on ip6_setdstifaddr never sleep */
1.111     dyoung    540:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    541:                        /*
                    542:                         * XXX maybe we should drop the packet here,
                    543:                         * as we could not provide enough information
                    544:                         * to the upper layers.
                    545:                         */
1.81      rpaulo    546:                }
1.165     ozaki-r   547:                pserialize_read_exit(s);
1.81      rpaulo    548:        }
                    549:
                    550:        /*
1.2       itojun    551:         * Process Hop-by-Hop options header if it's contained.
                    552:         * m may be modified in ip6_hopopts_input().
                    553:         * If a JumboPayload option is included, plen will also be modified.
                    554:         */
                    555:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    556:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    557:                struct ip6_hbh *hbh;
                    558:
                    559:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
1.186     maxv      560:                        /* m already freed */
1.159     ozaki-r   561:                        in6_ifstat_inc(rcvif, ifs6_in_discard);
1.171     ozaki-r   562:                        rtcache_unref(rt, ro);
                    563:                        percpu_putref(ip6_forward_rt_percpu);
1.186     maxv      564:                        return;
1.9       itojun    565:                }
1.22      itojun    566:
1.2       itojun    567:                /* adjust pointer */
                    568:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    569:
                    570:                /*
1.49      itojun    571:                 * if the payload length field is 0 and the next header field
1.22      itojun    572:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    573:                 * option MUST be included.
                    574:                 */
                    575:                if (ip6->ip6_plen == 0 && plen == 0) {
                    576:                        /*
                    577:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    578:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    579:                         * (non-zero) payload length to the variable plen.
1.22      itojun    580:                         */
1.116     thorpej   581:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.159     ozaki-r   582:                        in6_ifstat_inc(rcvif, ifs6_in_discard);
                    583:                        in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
1.22      itojun    584:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    585:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  586:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.171     ozaki-r   587:                        rtcache_unref(rt, ro);
                    588:                        percpu_putref(ip6_forward_rt_percpu);
1.22      itojun    589:                        return;
                    590:                }
1.9       itojun    591:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    592:                        sizeof(struct ip6_hbh));
                    593:                if (hbh == NULL) {
1.116     thorpej   594:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.171     ozaki-r   595:                        rtcache_unref(rt, ro);
                    596:                        percpu_putref(ip6_forward_rt_percpu);
1.9       itojun    597:                        return;
                    598:                }
1.57      thorpej   599:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    600:                nxt = hbh->ip6h_nxt;
1.2       itojun    601:
                    602:                /*
                    603:                 * accept the packet if a router alert option is included
                    604:                 * and we act as an IPv6 router.
                    605:                 */
1.5       itojun    606:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    607:                        ours = 1;
                    608:        } else
                    609:                nxt = ip6->ip6_nxt;
                    610:
                    611:        /*
1.186     maxv      612:         * Check that the amount of data in the buffers is at least much as
                    613:         * the IPv6 header would have us expect. Trim mbufs if longer than we
                    614:         * expect. Drop packet if shorter than we expect.
1.2       itojun    615:         */
                    616:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116     thorpej   617:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.159     ozaki-r   618:                in6_ifstat_inc(rcvif, ifs6_in_truncated);
1.171     ozaki-r   619:                goto bad_unref;
1.2       itojun    620:        }
                    621:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    622:                if (m->m_len == m->m_pkthdr.len) {
                    623:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    624:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    625:                } else
                    626:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    627:        }
                    628:
                    629:        /*
                    630:         * Forward if desirable.
                    631:         */
                    632:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    633:                /*
                    634:                 * If we are acting as a multicast router, all
                    635:                 * incoming multicast packets are passed to the
                    636:                 * kernel-level multicast forwarding function.
                    637:                 * The packet is returned (relatively) intact; if
                    638:                 * ip6_mforward() returns a non-zero value, the packet
                    639:                 * must be discarded, else it may be accepted below.
                    640:                 */
1.169     ozaki-r   641:                if (ip6_mrouter != NULL) {
                    642:                        int error;
                    643:
                    644:                        SOFTNET_LOCK();
                    645:                        error = ip6_mforward(ip6, rcvif, m);
                    646:                        SOFTNET_UNLOCK();
                    647:
                    648:                        if (error != 0) {
1.171     ozaki-r   649:                                rtcache_unref(rt, ro);
                    650:                                percpu_putref(ip6_forward_rt_percpu);
1.169     ozaki-r   651:                                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.170     ozaki-r   652:                                goto bad;
1.169     ozaki-r   653:                        }
1.2       itojun    654:                }
1.170     ozaki-r   655:                if (!ours)
1.171     ozaki-r   656:                        goto bad_unref;
1.22      itojun    657:        } else if (!ours) {
1.171     ozaki-r   658:                rtcache_unref(rt, ro);
                    659:                percpu_putref(ip6_forward_rt_percpu);
1.64      itojun    660:                ip6_forward(m, srcrt);
1.2       itojun    661:                return;
1.56      itojun    662:        }
1.25      itojun    663:
                    664:        ip6 = mtod(m, struct ip6_hdr *);
                    665:
                    666:        /*
                    667:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    668:         * tcp/udp stack and bypass security checks (act as if it was from
                    669:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    670:         *
                    671:         * For SIIT end node behavior, you may want to disable the check.
                    672:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    673:         * source.
                    674:         */
                    675:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    676:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   677:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.159     ozaki-r   678:                in6_ifstat_inc(rcvif, ifs6_in_addrerr);
1.171     ozaki-r   679:                goto bad_unref;
1.25      itojun    680:        }
1.2       itojun    681:
1.12      itojun    682: #ifdef IFA_STATS
1.28      itojun    683:        if (deliverifp != NULL) {
1.9       itojun    684:                struct in6_ifaddr *ia6;
1.165     ozaki-r   685:                int s = pserialize_read_enter();
1.9       itojun    686:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    687:                if (ia6)
                    688:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
1.165     ozaki-r   689:                pserialize_read_exit(s);
1.9       itojun    690:        }
                    691: #endif
1.116     thorpej   692:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    693:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    694:        nest = 0;
1.40      itojun    695:
1.171     ozaki-r   696:        if (rt != NULL) {
                    697:                rtcache_unref(rt, ro);
                    698:                rt = NULL;
                    699:        }
                    700:        percpu_putref(ip6_forward_rt_percpu);
                    701:
1.104     yamt      702:        rh_present = 0;
1.188     maxv      703:        frg_present = 0;
1.2       itojun    704:        while (nxt != IPPROTO_DONE) {
                    705:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116     thorpej   706:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.159     ozaki-r   707:                        in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
1.2       itojun    708:                        goto bad;
                    709:                }
1.8       itojun    710:
1.197     maxv      711:                M_VERIFY_PACKET(m);
                    712:
1.8       itojun    713:                /*
                    714:                 * protection against faulty packet - there should be
                    715:                 * more sanity checks in header chain processing.
                    716:                 */
                    717:                if (m->m_pkthdr.len < off) {
1.116     thorpej   718:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.159     ozaki-r   719:                        in6_ifstat_inc(rcvif, ifs6_in_truncated);
1.8       itojun    720:                        goto bad;
                    721:                }
                    722:
1.104     yamt      723:                if (nxt == IPPROTO_ROUTING) {
                    724:                        if (rh_present++) {
1.159     ozaki-r   725:                                in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
1.116     thorpej   726:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      727:                                goto bad;
                    728:                        }
1.188     maxv      729:                } else if (nxt == IPPROTO_FRAGMENT) {
                    730:                        if (frg_present++) {
                    731:                                in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
                    732:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
                    733:                                goto bad;
                    734:                        }
1.104     yamt      735:                }
                    736:
1.142     christos  737: #ifdef IPSEC
1.146     christos  738:                if (ipsec_used) {
1.94      degroote  739:                        /*
1.186     maxv      740:                         * Enforce IPsec policy checking if we are seeing last
                    741:                         * header. Note that we do not visit this with
1.146     christos  742:                         * protocols with pcb layer code - like udp/tcp/raw ip.
1.94      degroote  743:                         */
1.204.2.1! christos  744:                        if ((inet6sw[ip6_protox[nxt]].pr_flags
1.146     christos  745:                            & PR_LASTHDR) != 0) {
1.169     ozaki-r   746:                                int error;
                    747:
1.202     maxv      748:                                error = ipsec_ip_input(m, false);
1.146     christos  749:                                if (error)
                    750:                                        goto bad;
                    751:                        }
1.94      degroote  752:                }
1.186     maxv      753: #endif
1.94      degroote  754:
1.2       itojun    755:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    756:        }
                    757:        return;
1.171     ozaki-r   758:
1.186     maxv      759: bad_unref:
1.171     ozaki-r   760:        rtcache_unref(rt, ro);
                    761:        percpu_putref(ip6_forward_rt_percpu);
1.186     maxv      762: bad:
1.2       itojun    763:        m_freem(m);
1.171     ozaki-r   764:        return;
1.2       itojun    765: }
                    766:
1.199     maxv      767: static bool
                    768: ip6_badaddr(struct ip6_hdr *ip6)
                    769: {
                    770:        /* Check against address spoofing/corruption. */
                    771:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    772:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
                    773:                return true;
                    774:        }
                    775:
                    776:        /*
                    777:         * The following check is not documented in specs.  A malicious
                    778:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    779:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    780:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    781:         *
                    782:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    783:         * support IPv4-less kernel compilation, we cannot support SIIT
                    784:         * environment at all.  So, it makes more sense for us to reject any
                    785:         * malicious packets for non-SIIT environment, than try to do a
                    786:         * partial support for SIIT environment.
                    787:         */
                    788:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    789:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    790:                return true;
                    791:        }
                    792:
                    793:        /*
                    794:         * Reject packets with IPv4-compatible IPv6 addresses (RFC4291).
                    795:         */
                    796:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    797:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    798:                return true;
                    799:        }
                    800:
                    801:        return false;
                    802: }
                    803:
1.2       itojun    804: /*
1.81      rpaulo    805:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    806:  */
                    807: static struct m_tag *
1.112     dyoung    808: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    809: {
                    810:        struct m_tag *mtag;
1.144     christos  811:        struct ip6aux *ip6a;
1.81      rpaulo    812:
                    813:        mtag = ip6_addaux(m);
1.144     christos  814:        if (mtag == NULL)
                    815:                return NULL;
1.112     dyoung    816:
1.144     christos  817:        ip6a = (struct ip6aux *)(mtag + 1);
                    818:        if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) {
                    819:                IP6_STATINC(IP6_STAT_BADSCOPE);
                    820:                return NULL;
1.112     dyoung    821:        }
1.144     christos  822:
                    823:        ip6a->ip6a_src = ia->ia_addr.sin6_addr;
                    824:        ip6a->ip6a_flags = ia->ia6_flags;
                    825:        return mtag;
1.81      rpaulo    826: }
                    827:
1.112     dyoung    828: const struct ip6aux *
1.107     christos  829: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    830: {
                    831:        struct m_tag *mtag;
                    832:
                    833:        mtag = ip6_findaux(m);
1.112     dyoung    834:        if (mtag != NULL)
                    835:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    836:        else
                    837:                return NULL;
                    838: }
                    839:
                    840: /*
1.2       itojun    841:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    842:  * included, the real payload length will be stored in plenp.
1.107     christos  843:  *
                    844:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    845:  */
1.136     drochner  846: int
1.107     christos  847: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
                    848:        struct mbuf **mp, int *offp)
1.2       itojun    849: {
1.35      itojun    850:        struct mbuf *m = *mp;
1.2       itojun    851:        int off = *offp, hbhlen;
                    852:        struct ip6_hbh *hbh;
                    853:
                    854:        /* validation of the length of the header */
1.9       itojun    855:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1.189     maxv      856:            sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1.9       itojun    857:        if (hbh == NULL) {
1.116     thorpej   858:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    859:                return -1;
                    860:        }
                    861:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    862:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
1.189     maxv      863:            hbhlen);
1.9       itojun    864:        if (hbh == NULL) {
1.116     thorpej   865:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    866:                return -1;
                    867:        }
1.57      thorpej   868:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    869:        off += hbhlen;
                    870:        hbhlen -= sizeof(struct ip6_hbh);
                    871:
                    872:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
1.189     maxv      873:            hbhlen, rtalertp, plenp) < 0)
                    874:                return -1;
1.2       itojun    875:
                    876:        *offp = off;
                    877:        *mp = m;
1.189     maxv      878:        return 0;
1.2       itojun    879: }
                    880:
                    881: /*
                    882:  * Search header for all Hop-by-hop options and process each option.
                    883:  * This function is separate from ip6_hopopts_input() in order to
                    884:  * handle a case where the sending node itself process its hop-by-hop
                    885:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    886:  *
                    887:  * The function assumes that hbh header is located right after the IPv6 header
                    888:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    889:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    890:  */
1.136     drochner  891: static int
1.107     christos  892: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
                    893:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    894: {
                    895:        struct ip6_hdr *ip6;
                    896:        int optlen = 0;
                    897:        u_int8_t *opt = opthead;
                    898:        u_int16_t rtalert_val;
1.22      itojun    899:        u_int32_t jumboplen;
1.55      itojun    900:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    901:
                    902:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    903:                switch (*opt) {
                    904:                case IP6OPT_PAD1:
                    905:                        optlen = 1;
                    906:                        break;
                    907:                case IP6OPT_PADN:
                    908:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   909:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    910:                                goto bad;
                    911:                        }
                    912:                        optlen = *(opt + 1) + 2;
                    913:                        break;
                    914:                case IP6OPT_RTALERT:
                    915:                        /* XXX may need check for alignment */
                    916:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116     thorpej   917:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    918:                                goto bad;
                    919:                        }
                    920:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    921:                                /* XXX stat */
                    922:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    923:                                    ICMP6_PARAMPROB_HEADER,
                    924:                                    erroff + opt + 1 - opthead);
                    925:                                return (-1);
1.35      itojun    926:                        }
                    927:                        optlen = IP6OPT_RTALERT_LEN;
1.126     tsutsui   928:                        memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35      itojun    929:                        *rtalertp = ntohs(rtalert_val);
                    930:                        break;
                    931:                case IP6OPT_JUMBO:
1.22      itojun    932:                        /* XXX may need check for alignment */
                    933:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116     thorpej   934:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    935:                                goto bad;
                    936:                        }
1.35      itojun    937:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    938:                                /* XXX stat */
                    939:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    940:                                    ICMP6_PARAMPROB_HEADER,
                    941:                                    erroff + opt + 1 - opthead);
                    942:                                return (-1);
1.35      itojun    943:                        }
1.22      itojun    944:                        optlen = IP6OPT_JUMBO_LEN;
                    945:
                    946:                        /*
                    947:                         * IPv6 packets that have non 0 payload length
1.35      itojun    948:                         * must not contain a jumbo payload option.
1.22      itojun    949:                         */
                    950:                        ip6 = mtod(m, struct ip6_hdr *);
                    951:                        if (ip6->ip6_plen) {
1.116     thorpej   952:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    953:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    954:                                    ICMP6_PARAMPROB_HEADER,
                    955:                                    erroff + opt - opthead);
                    956:                                return (-1);
1.22      itojun    957:                        }
1.2       itojun    958:
1.22      itojun    959:                        /*
                    960:                         * We may see jumbolen in unaligned location, so
1.191     maxv      961:                         * we'd need to perform memcpy().
1.22      itojun    962:                         */
1.126     tsutsui   963:                        memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22      itojun    964:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    965:
                    966: #if 1
                    967:                        /*
                    968:                         * if there are multiple jumbo payload options,
                    969:                         * *plenp will be non-zero and the packet will be
                    970:                         * rejected.
                    971:                         * the behavior may need some debate in ipngwg -
                    972:                         * multiple options does not make sense, however,
                    973:                         * there's no explicit mention in specification.
                    974:                         */
                    975:                        if (*plenp != 0) {
1.116     thorpej   976:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    977:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    978:                                    ICMP6_PARAMPROB_HEADER,
                    979:                                    erroff + opt + 2 - opthead);
                    980:                                return (-1);
1.22      itojun    981:                        }
1.8       itojun    982: #endif
1.2       itojun    983:
1.22      itojun    984:                        /*
                    985:                         * jumbo payload length must be larger than 65535.
                    986:                         */
                    987:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116     thorpej   988:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    989:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    990:                                    ICMP6_PARAMPROB_HEADER,
                    991:                                    erroff + opt + 2 - opthead);
                    992:                                return (-1);
1.22      itojun    993:                        }
                    994:                        *plenp = jumboplen;
                    995:
                    996:                        break;
1.35      itojun    997:                default:                /* unknown option */
                    998:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   999:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun   1000:                                goto bad;
                   1001:                        }
1.55      itojun   1002:                        optlen = ip6_unknown_opt(opt, m,
                   1003:                            erroff + opt - opthead);
                   1004:                        if (optlen == -1)
                   1005:                                return (-1);
1.35      itojun   1006:                        optlen += 2;
                   1007:                        break;
1.2       itojun   1008:                }
                   1009:        }
                   1010:
1.55      itojun   1011:        return (0);
1.2       itojun   1012:
                   1013:   bad:
                   1014:        m_freem(m);
1.55      itojun   1015:        return (-1);
1.2       itojun   1016: }
                   1017:
                   1018: /*
                   1019:  * Unknown option processing.
                   1020:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1021:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1022:  * is not continuous in order to return an ICMPv6 error.
                   1023:  */
                   1024: int
1.107     christos 1025: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun   1026: {
                   1027:        struct ip6_hdr *ip6;
                   1028:
1.35      itojun   1029:        switch (IP6OPT_TYPE(*optp)) {
                   1030:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1031:                return ((int)*(optp + 1));
1.35      itojun   1032:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1033:                m_freem(m);
1.58      itojun   1034:                return (-1);
1.35      itojun   1035:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116     thorpej  1036:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1037:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1038:                return (-1);
1.35      itojun   1039:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116     thorpej  1040:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1041:                ip6 = mtod(m, struct ip6_hdr *);
                   1042:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1043:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1044:                        m_freem(m);
                   1045:                else
                   1046:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1047:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1048:                return (-1);
1.2       itojun   1049:        }
                   1050:
                   1051:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1052:        return (-1);
1.2       itojun   1053: }
                   1054:
                   1055: void
1.107     christos 1056: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
                   1057:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1058: {
1.179     christos 1059:        struct socket *so = in6p->in6p_socket;
1.85      rpaulo   1060: #ifdef RFC2292
                   1061: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1062: #else
                   1063: #define IS2292(x, y)   (y)
                   1064: #endif
                   1065:
1.179     christos 1066:        if (SOOPT_TIMESTAMP(so->so_options))
1.200     maxv     1067:                mp = sbsavetimestamp(so->so_options, mp);
1.87      rpaulo   1068:
                   1069:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1070:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1071:                return;
                   1072:
1.2       itojun   1073:        /* RFC 2292 sec. 5 */
1.35      itojun   1074:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1075:                struct in6_pktinfo pi6;
1.85      rpaulo   1076:
1.126     tsutsui  1077:                memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81      rpaulo   1078:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.160     ozaki-r  1079:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index;
1.180     christos 1080:                *mp = sbcreatecontrol(&pi6, sizeof(pi6),
1.85      rpaulo   1081:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1082:                if (*mp)
                   1083:                        mp = &(*mp)->m_next;
                   1084:        }
1.85      rpaulo   1085:
1.2       itojun   1086:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1087:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1088:
1.180     christos 1089:                *mp = sbcreatecontrol(&hlim, sizeof(hlim),
1.85      rpaulo   1090:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1091:                if (*mp)
                   1092:                        mp = &(*mp)->m_next;
                   1093:        }
                   1094:
                   1095:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1096:                u_int32_t flowinfo;
                   1097:                int tclass;
                   1098:
                   1099:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1100:                flowinfo >>= 20;
                   1101:
                   1102:                tclass = flowinfo & 0xff;
1.180     christos 1103:                *mp = sbcreatecontrol(&tclass, sizeof(tclass),
1.85      rpaulo   1104:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1105:
1.2       itojun   1106:                if (*mp)
                   1107:                        mp = &(*mp)->m_next;
                   1108:        }
                   1109:
                   1110:        /*
1.75      itojun   1111:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1112:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1113:         * strict, since there might be some hop-by-hop options which can be
                   1114:         * returned to normal user.
1.85      rpaulo   1115:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1116:         */
1.75      itojun   1117:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1118:                /*
                   1119:                 * Check if a hop-by-hop options header is contatined in the
                   1120:                 * received packet, and if so, store the options as ancillary
                   1121:                 * data. Note that a hop-by-hop options header must be
                   1122:                 * just after the IPv6 header, which fact is assured through
                   1123:                 * the IPv6 input processing.
                   1124:                 */
1.78      christos 1125:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1126:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1127:                        struct ip6_hbh *hbh;
                   1128:                        int hbhlen;
1.62      itojun   1129:                        struct mbuf *ext;
1.9       itojun   1130:
1.62      itojun   1131:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1132:                            xip6->ip6_nxt);
1.62      itojun   1133:                        if (ext == NULL) {
1.116     thorpej  1134:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1135:                                return;
                   1136:                        }
1.62      itojun   1137:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1138:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1139:                        if (hbhlen != ext->m_len) {
                   1140:                                m_freem(ext);
1.116     thorpej  1141:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1142:                                return;
                   1143:                        }
1.2       itojun   1144:
                   1145:                        /*
                   1146:                         * XXX: We copy whole the header even if a jumbo
                   1147:                         * payload option is included, which option is to
                   1148:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1149:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1150:                         */
1.180     christos 1151:                        *mp = sbcreatecontrol(hbh, hbhlen,
1.85      rpaulo   1152:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1153:                            IPPROTO_IPV6);
1.2       itojun   1154:                        if (*mp)
                   1155:                                mp = &(*mp)->m_next;
1.62      itojun   1156:                        m_freem(ext);
1.2       itojun   1157:                }
                   1158:        }
                   1159:
                   1160:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1161:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1162:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1163:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1164:
                   1165:                /*
                   1166:                 * Search for destination options headers or routing
                   1167:                 * header(s) through the header chain, and stores each
                   1168:                 * header as ancillary data.
                   1169:                 * Note that the order of the headers remains in
                   1170:                 * the chain of ancillary data.
                   1171:                 */
1.86      rpaulo   1172:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1173:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1174:                        int elen;
1.62      itojun   1175:                        struct mbuf *ext = NULL;
1.9       itojun   1176:
1.62      itojun   1177:                        /*
                   1178:                         * if it is not an extension header, don't try to
                   1179:                         * pull it from the chain.
                   1180:                         */
                   1181:                        switch (nxt) {
                   1182:                        case IPPROTO_DSTOPTS:
                   1183:                        case IPPROTO_ROUTING:
                   1184:                        case IPPROTO_HOPOPTS:
                   1185:                        case IPPROTO_AH: /* is it possible? */
                   1186:                                break;
                   1187:                        default:
                   1188:                                goto loopend;
                   1189:                        }
                   1190:
                   1191:                        ext = ip6_pullexthdr(m, off, nxt);
                   1192:                        if (ext == NULL) {
1.116     thorpej  1193:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1194:                                return;
                   1195:                        }
1.62      itojun   1196:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1197:                        if (nxt == IPPROTO_AH)
                   1198:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1199:                        else
                   1200:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1201:                        if (elen != ext->m_len) {
                   1202:                                m_freem(ext);
1.116     thorpej  1203:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1204:                                return;
                   1205:                        }
1.57      thorpej  1206:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1207:
1.35      itojun   1208:                        switch (nxt) {
1.62      itojun   1209:                        case IPPROTO_DSTOPTS:
1.127     martin   1210:                                if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35      itojun   1211:                                        break;
                   1212:
1.180     christos 1213:                                *mp = sbcreatecontrol(ip6e, elen,
1.85      rpaulo   1214:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1215:                                    IPPROTO_IPV6);
1.35      itojun   1216:                                if (*mp)
                   1217:                                        mp = &(*mp)->m_next;
                   1218:                                break;
                   1219:
                   1220:                        case IPPROTO_ROUTING:
1.127     martin   1221:                                if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35      itojun   1222:                                        break;
                   1223:
1.180     christos 1224:                                *mp = sbcreatecontrol(ip6e, elen,
1.85      rpaulo   1225:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1226:                                    IPPROTO_IPV6);
1.35      itojun   1227:                                if (*mp)
                   1228:                                        mp = &(*mp)->m_next;
                   1229:                                break;
                   1230:
1.62      itojun   1231:                        case IPPROTO_HOPOPTS:
                   1232:                        case IPPROTO_AH: /* is it possible? */
                   1233:                                break;
                   1234:
1.35      itojun   1235:                        default:
                   1236:                                /*
1.62      itojun   1237:                                 * other cases have been filtered in the above.
                   1238:                                 * none will visit this case.  here we supply
                   1239:                                 * the code just in case (nxt overwritten or
                   1240:                                 * other cases).
1.35      itojun   1241:                                 */
1.62      itojun   1242:                                m_freem(ext);
1.35      itojun   1243:                                goto loopend;
                   1244:
1.2       itojun   1245:                        }
                   1246:
                   1247:                        /* proceed with the next header. */
1.9       itojun   1248:                        off += elen;
1.2       itojun   1249:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1250:                        ip6e = NULL;
                   1251:                        m_freem(ext);
                   1252:                        ext = NULL;
1.2       itojun   1253:                }
                   1254:          loopend:
1.62      itojun   1255:                ;
1.2       itojun   1256:        }
1.62      itojun   1257: }
1.85      rpaulo   1258: #undef IS2292
                   1259:
                   1260:
                   1261: void
1.95      dyoung   1262: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1263:     uint32_t *mtu)
1.85      rpaulo   1264: {
                   1265:        struct socket *so;
                   1266:        struct mbuf *m_mtu;
                   1267:        struct ip6_mtuinfo mtuctl;
                   1268:
                   1269:        so = in6p->in6p_socket;
                   1270:
                   1271:        if (mtu == NULL)
                   1272:                return;
                   1273:
1.177     ozaki-r  1274:        KASSERT(so != NULL);
1.85      rpaulo   1275:
                   1276:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1277:        mtuctl.ip6m_mtu = *mtu;
                   1278:        mtuctl.ip6m_addr = *dst;
                   1279:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1280:                return;
                   1281:
1.180     christos 1282:        if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1283:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1284:                return;
                   1285:
1.95      dyoung   1286:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1287:            == 0) {
1.195     roy      1288:                soroverflow(so);
1.85      rpaulo   1289:                m_freem(m_mtu);
                   1290:        } else
                   1291:                sorwakeup(so);
                   1292:
                   1293:        return;
                   1294: }
1.62      itojun   1295:
                   1296: /*
                   1297:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1298:  * contains the result, or NULL on error.
                   1299:  */
                   1300: static struct mbuf *
1.107     christos 1301: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1302: {
                   1303:        struct ip6_ext ip6e;
                   1304:        size_t elen;
                   1305:        struct mbuf *n;
                   1306:
1.97      christos 1307:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1308:        if (nxt == IPPROTO_AH)
                   1309:                elen = (ip6e.ip6e_len + 2) << 2;
                   1310:        else
                   1311:                elen = (ip6e.ip6e_len + 1) << 3;
                   1312:
                   1313:        MGET(n, M_DONTWAIT, MT_DATA);
                   1314:        if (n && elen >= MLEN) {
                   1315:                MCLGET(n, M_DONTWAIT);
                   1316:                if ((n->m_flags & M_EXT) == 0) {
                   1317:                        m_free(n);
                   1318:                        n = NULL;
                   1319:                }
                   1320:        }
                   1321:        if (!n)
                   1322:                return NULL;
                   1323:
                   1324:        n->m_len = 0;
                   1325:        if (elen >= M_TRAILINGSPACE(n)) {
                   1326:                m_free(n);
                   1327:                return NULL;
                   1328:        }
                   1329:
1.97      christos 1330:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1331:        n->m_len = elen;
                   1332:        return n;
1.2       itojun   1333: }
                   1334:
                   1335: /*
1.187     maxv     1336:  * Get offset to the previous header followed by the header
1.2       itojun   1337:  * currently processed.
                   1338:  */
1.187     maxv     1339: int
1.107     christos 1340: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1341: {
                   1342:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1343:
1.187     maxv     1344:        if (off == sizeof(struct ip6_hdr)) {
                   1345:                return offsetof(struct ip6_hdr, ip6_nxt);
                   1346:        } else if (off < sizeof(struct ip6_hdr)) {
                   1347:                panic("%s: off < sizeof(struct ip6_hdr)", __func__);
                   1348:        } else {
                   1349:                int len, nlen, nxt;
                   1350:                struct ip6_ext ip6e;
1.2       itojun   1351:
                   1352:                nxt = ip6->ip6_nxt;
                   1353:                len = sizeof(struct ip6_hdr);
1.187     maxv     1354:                nlen = 0;
1.2       itojun   1355:                while (len < off) {
1.187     maxv     1356:                        m_copydata(m, len, sizeof(ip6e), &ip6e);
1.2       itojun   1357:
1.35      itojun   1358:                        switch (nxt) {
1.2       itojun   1359:                        case IPPROTO_FRAGMENT:
1.187     maxv     1360:                                nlen = sizeof(struct ip6_frag);
1.2       itojun   1361:                                break;
                   1362:                        case IPPROTO_AH:
1.187     maxv     1363:                                nlen = (ip6e.ip6e_len + 2) << 2;
1.2       itojun   1364:                                break;
                   1365:                        default:
1.187     maxv     1366:                                nlen = (ip6e.ip6e_len + 1) << 3;
1.2       itojun   1367:                                break;
                   1368:                        }
1.187     maxv     1369:                        len += nlen;
                   1370:                        nxt = ip6e.ip6e_nxt;
1.2       itojun   1371:                }
1.187     maxv     1372:
                   1373:                return (len - nlen);
1.18      itojun   1374:        }
                   1375: }
                   1376:
                   1377: /*
                   1378:  * get next header offset.  m will be retained.
                   1379:  */
1.192     maxv     1380: int
1.107     christos 1381: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1382: {
                   1383:        struct ip6_hdr ip6;
                   1384:        struct ip6_ext ip6e;
                   1385:        struct ip6_frag fh;
                   1386:
                   1387:        /* just in case */
                   1388:        if (m == NULL)
1.189     maxv     1389:                panic("%s: m == NULL", __func__);
1.18      itojun   1390:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1391:                return -1;
                   1392:
                   1393:        switch (proto) {
                   1394:        case IPPROTO_IPV6:
1.83      rpaulo   1395:                /* do not chase beyond intermediate IPv6 headers */
                   1396:                if (off != 0)
                   1397:                        return -1;
1.18      itojun   1398:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1399:                        return -1;
1.97      christos 1400:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1401:                if (nxtp)
                   1402:                        *nxtp = ip6.ip6_nxt;
                   1403:                off += sizeof(ip6);
                   1404:                return off;
                   1405:
                   1406:        case IPPROTO_FRAGMENT:
                   1407:                /*
                   1408:                 * terminate parsing if it is not the first fragment,
                   1409:                 * it does not make sense to parse through it.
                   1410:                 */
                   1411:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1412:                        return -1;
1.97      christos 1413:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1414:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1415:                        return -1;
                   1416:                if (nxtp)
                   1417:                        *nxtp = fh.ip6f_nxt;
                   1418:                off += sizeof(struct ip6_frag);
                   1419:                return off;
                   1420:
                   1421:        case IPPROTO_AH:
                   1422:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1423:                        return -1;
1.97      christos 1424:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1425:                if (nxtp)
                   1426:                        *nxtp = ip6e.ip6e_nxt;
                   1427:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1428:                if (m->m_pkthdr.len < off)
                   1429:                        return -1;
1.18      itojun   1430:                return off;
                   1431:
                   1432:        case IPPROTO_HOPOPTS:
                   1433:        case IPPROTO_ROUTING:
                   1434:        case IPPROTO_DSTOPTS:
                   1435:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1436:                        return -1;
1.97      christos 1437:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1438:                if (nxtp)
                   1439:                        *nxtp = ip6e.ip6e_nxt;
                   1440:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1441:                if (m->m_pkthdr.len < off)
                   1442:                        return -1;
1.18      itojun   1443:                return off;
                   1444:
                   1445:        case IPPROTO_NONE:
                   1446:        case IPPROTO_ESP:
                   1447:        case IPPROTO_IPCOMP:
                   1448:                /* give up */
                   1449:                return -1;
                   1450:
                   1451:        default:
                   1452:                return -1;
                   1453:        }
                   1454: }
                   1455:
                   1456: /*
                   1457:  * get offset for the last header in the chain.  m will be kept untainted.
                   1458:  */
                   1459: int
1.107     christos 1460: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1461: {
                   1462:        int newoff;
                   1463:        int nxt;
                   1464:
                   1465:        if (!nxtp) {
                   1466:                nxt = -1;
                   1467:                nxtp = &nxt;
                   1468:        }
1.86      rpaulo   1469:        for (;;) {
1.18      itojun   1470:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1471:                if (newoff < 0)
                   1472:                        return off;
                   1473:                else if (newoff < off)
                   1474:                        return -1;      /* invalid */
                   1475:                else if (newoff == off)
                   1476:                        return newoff;
                   1477:
                   1478:                off = newoff;
                   1479:                proto = *nxtp;
1.2       itojun   1480:        }
                   1481: }
                   1482:
1.81      rpaulo   1483: struct m_tag *
1.107     christos 1484: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1485: {
                   1486:        struct m_tag *mtag;
                   1487:
1.204.2.1! christos 1488:        mtag = m_tag_find(m, PACKET_TAG_INET6);
1.81      rpaulo   1489:        if (!mtag) {
                   1490:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1491:                    M_NOWAIT);
                   1492:                if (mtag) {
                   1493:                        m_tag_prepend(m, mtag);
1.124     cegger   1494:                        memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81      rpaulo   1495:                }
                   1496:        }
                   1497:        return mtag;
                   1498: }
                   1499:
                   1500: struct m_tag *
1.107     christos 1501: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1502: {
                   1503:        struct m_tag *mtag;
                   1504:
1.204.2.1! christos 1505:        mtag = m_tag_find(m, PACKET_TAG_INET6);
1.81      rpaulo   1506:        return mtag;
                   1507: }
                   1508:
                   1509: void
1.107     christos 1510: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1511: {
                   1512:        struct m_tag *mtag;
                   1513:
1.204.2.1! christos 1514:        mtag = m_tag_find(m, PACKET_TAG_INET6);
1.81      rpaulo   1515:        if (mtag)
                   1516:                m_tag_delete(m, mtag);
                   1517: }
                   1518:
1.2       itojun   1519: /*
                   1520:  * System control for IP6
                   1521:  */
                   1522:
1.120     matt     1523: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2       itojun   1524:        0,              0,              0,              0,
                   1525:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1526:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1527:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1528:        0,              0,              0,              0,
                   1529:        ENOPROTOOPT
                   1530: };
                   1531:
1.153     christos 1532: extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS);
                   1533:
1.116     thorpej  1534: static int
                   1535: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
                   1536: {
                   1537:
1.119     thorpej  1538:        return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116     thorpej  1539: }
                   1540:
1.128     pooka    1541: static void
                   1542: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2       itojun   1543: {
1.26      itojun   1544:
1.73      atatat   1545:        sysctl_createv(clog, 0, NULL, NULL,
                   1546:                       CTLFLAG_PERMANENT,
1.74      atatat   1547:                       CTLTYPE_NODE, "inet6",
                   1548:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1549:                       NULL, 0, NULL, 0,
                   1550:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1551:        sysctl_createv(clog, 0, NULL, NULL,
                   1552:                       CTLFLAG_PERMANENT,
1.74      atatat   1553:                       CTLTYPE_NODE, "ip6",
                   1554:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1555:                       NULL, 0, NULL, 0,
                   1556:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1557:
1.73      atatat   1558:        sysctl_createv(clog, 0, NULL, NULL,
                   1559:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1560:                       CTLTYPE_INT, "forwarding",
                   1561:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1562:                       NULL, 0, &ip6_forwarding, 0,
                   1563:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1564:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1565:        sysctl_createv(clog, 0, NULL, NULL,
                   1566:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1567:                       CTLTYPE_INT, "redirect",
                   1568:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1569:                       NULL, 0, &ip6_sendredirects, 0,
                   1570:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1571:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1572:        sysctl_createv(clog, 0, NULL, NULL,
                   1573:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1574:                       CTLTYPE_INT, "hlim",
                   1575:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1576:                       NULL, 0, &ip6_defhlim, 0,
                   1577:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1578:                       IPV6CTL_DEFHLIM, CTL_EOL);
1.73      atatat   1579:        sysctl_createv(clog, 0, NULL, NULL,
                   1580:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1581:                       CTLTYPE_INT, "maxfragpackets",
                   1582:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1583:                                    "for reassembly"),
1.70      atatat   1584:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1585:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1586:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
1.73      atatat   1587:        sysctl_createv(clog, 0, NULL, NULL,
                   1588:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1589:                       CTLTYPE_INT, "accept_rtadv",
                   1590:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1591:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1592:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1593:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1594:        sysctl_createv(clog, 0, NULL, NULL,
                   1595:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.131     spz      1596:                       CTLTYPE_INT, "rtadv_maxroutes",
                   1597:                       SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"),
                   1598:                       NULL, 0, &ip6_rtadv_maxroutes, 0,
                   1599:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1600:                       IPV6CTL_RTADV_MAXROUTES, CTL_EOL);
                   1601:        sysctl_createv(clog, 0, NULL, NULL,
                   1602:                       CTLFLAG_PERMANENT,
                   1603:                       CTLTYPE_INT, "rtadv_numroutes",
                   1604:                       SYSCTL_DESCR("Current number of routes accepted via router advertisements"),
                   1605:                       NULL, 0, &nd6_numroutes, 0,
                   1606:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1607:                       IPV6CTL_RTADV_NUMROUTES, CTL_EOL);
                   1608:        sysctl_createv(clog, 0, NULL, NULL,
                   1609:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1610:                       CTLTYPE_INT, "keepfaith",
                   1611:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1612:                       NULL, 0, &ip6_keepfaith, 0,
                   1613:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1614:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1615:        sysctl_createv(clog, 0, NULL, NULL,
                   1616:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1617:                       CTLTYPE_INT, "log_interval",
1.189     maxv     1618:                       SYSCTL_DESCR("Minimum interval between logging "
1.74      atatat   1619:                                    "unroutable packets"),
1.70      atatat   1620:                       NULL, 0, &ip6_log_interval, 0,
                   1621:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1622:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1623:        sysctl_createv(clog, 0, NULL, NULL,
                   1624:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1625:                       CTLTYPE_INT, "hdrnestlimit",
                   1626:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1627:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1628:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1629:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1630:        sysctl_createv(clog, 0, NULL, NULL,
                   1631:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1632:                       CTLTYPE_INT, "dad_count",
                   1633:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1634:                                    "probes to send"),
1.70      atatat   1635:                       NULL, 0, &ip6_dad_count, 0,
                   1636:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1637:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1638:        sysctl_createv(clog, 0, NULL, NULL,
                   1639:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1640:                       CTLTYPE_INT, "auto_flowlabel",
                   1641:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1642:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1643:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1644:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1645:        sysctl_createv(clog, 0, NULL, NULL,
                   1646:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1647:                       CTLTYPE_INT, "defmcasthlim",
                   1648:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1649:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1650:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1651:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.73      atatat   1652:        sysctl_createv(clog, 0, NULL, NULL,
                   1653:                       CTLFLAG_PERMANENT,
1.74      atatat   1654:                       CTLTYPE_STRING, "kame_version",
                   1655:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1656:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1657:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1658:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1659:        sysctl_createv(clog, 0, NULL, NULL,
                   1660:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1661:                       CTLTYPE_INT, "use_deprecated",
                   1662:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1663:                                    "source addresses"),
1.70      atatat   1664:                       NULL, 0, &ip6_use_deprecated, 0,
                   1665:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1666:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1667:        sysctl_createv(clog, 0, NULL, NULL,
                   1668:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1669:                       CTLTYPE_INT, "rr_prune", NULL,
                   1670:                       NULL, 0, &ip6_rr_prune, 0,
                   1671:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1672:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1673:        sysctl_createv(clog, 0, NULL, NULL,
                   1674:                       CTLFLAG_PERMANENT
1.70      atatat   1675: #ifndef INET6_BINDV6ONLY
1.73      atatat   1676:                       |CTLFLAG_READWRITE,
1.70      atatat   1677: #endif
1.74      atatat   1678:                       CTLTYPE_INT, "v6only",
                   1679:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1680:                                    "to PF_INET sockets"),
1.70      atatat   1681:                       NULL, 0, &ip6_v6only, 0,
                   1682:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1683:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1684:        sysctl_createv(clog, 0, NULL, NULL,
                   1685:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1686:                       CTLTYPE_INT, "anonportmin",
                   1687:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1688:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1689:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1690:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1691:        sysctl_createv(clog, 0, NULL, NULL,
                   1692:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1693:                       CTLTYPE_INT, "anonportmax",
                   1694:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1695:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1696:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1697:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1698: #ifndef IPNOPRIVPORTS
1.73      atatat   1699:        sysctl_createv(clog, 0, NULL, NULL,
                   1700:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1701:                       CTLTYPE_INT, "lowportmin",
                   1702:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1703:                                    "to assign"),
1.70      atatat   1704:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1705:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1706:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1707:        sysctl_createv(clog, 0, NULL, NULL,
                   1708:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1709:                       CTLTYPE_INT, "lowportmax",
                   1710:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1711:                                    "to assign"),
1.70      atatat   1712:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1713:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1714:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1715: #endif /* IPNOPRIVPORTS */
1.73      atatat   1716:        sysctl_createv(clog, 0, NULL, NULL,
                   1717:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.153     christos 1718:                       CTLTYPE_INT, "auto_linklocal",
                   1719:                       SYSCTL_DESCR("Default value of per-interface flag for "
                   1720:                                    "adding an IPv6 link-local address to "
                   1721:                                    "interfaces when attached"),
                   1722:                       NULL, 0, &ip6_auto_linklocal, 0,
                   1723:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1724:                       IPV6CTL_AUTO_LINKLOCAL, CTL_EOL);
                   1725:        sysctl_createv(clog, 0, NULL, NULL,
                   1726:                       CTLFLAG_PERMANENT|CTLFLAG_READONLY,
                   1727:                       CTLTYPE_STRUCT, "addctlpolicy",
                   1728:                       SYSCTL_DESCR("Return the current address control"
                   1729:                           " policy"),
                   1730:                       sysctl_net_inet6_addrctlpolicy, 0, NULL, 0,
                   1731:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1732:                       IPV6CTL_ADDRCTLPOLICY, CTL_EOL);
                   1733:        sysctl_createv(clog, 0, NULL, NULL,
                   1734:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1735:                       CTLTYPE_INT, "use_tempaddr",
                   1736:                       SYSCTL_DESCR("Use temporary address"),
                   1737:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1738:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1739:                       CTL_CREATE, CTL_EOL);
                   1740:        sysctl_createv(clog, 0, NULL, NULL,
                   1741:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.150     roy      1742:                       CTLTYPE_INT, "prefer_tempaddr",
                   1743:                       SYSCTL_DESCR("Prefer temporary address as source "
                   1744:                                    "address"),
                   1745:                       NULL, 0, &ip6_prefer_tempaddr, 0,
                   1746:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1747:                       CTL_CREATE, CTL_EOL);
                   1748:        sysctl_createv(clog, 0, NULL, NULL,
                   1749:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1750:                       CTLTYPE_INT, "temppltime",
                   1751:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1752:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1753:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1754:                       CTL_CREATE, CTL_EOL);
                   1755:        sysctl_createv(clog, 0, NULL, NULL,
                   1756:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1757:                       CTLTYPE_INT, "tempvltime",
                   1758:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1759:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1760:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1761:                       CTL_CREATE, CTL_EOL);
                   1762:        sysctl_createv(clog, 0, NULL, NULL,
                   1763:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1764:                       CTLTYPE_INT, "maxfrags",
                   1765:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1766:                       NULL, 0, &ip6_maxfrags, 0,
                   1767:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1768:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1769:        sysctl_createv(clog, 0, NULL, NULL,
                   1770:                       CTLFLAG_PERMANENT,
                   1771:                       CTLTYPE_STRUCT, "stats",
                   1772:                       SYSCTL_DESCR("IPv6 statistics"),
1.116     thorpej  1773:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1774:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1775:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1776:        sysctl_createv(clog, 0, NULL, NULL,
                   1777:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1778:                       CTLTYPE_INT, "use_defaultzone",
                   1779:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1780:                       NULL, 0, &ip6_use_defzone, 0,
                   1781:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1782:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1783:        sysctl_createv(clog, 0, NULL, NULL,
                   1784:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1785:                       CTLTYPE_INT, "mcast_pmtu",
                   1786:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1787:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1788:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1789:                       CTL_CREATE, CTL_EOL);
1.138     christos 1790:        /* anonportalgo RFC6056 subtree */
1.140     christos 1791:        const struct sysctlnode *portalgo_node;
                   1792:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.138     christos 1793:                       CTLFLAG_PERMANENT,
                   1794:                       CTLTYPE_NODE, "anonportalgo",
                   1795:                       SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"),
                   1796:                       NULL, 0, NULL, 0,
                   1797:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL);
1.140     christos 1798:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.138     christos 1799:                       CTLFLAG_PERMANENT,
                   1800:                       CTLTYPE_STRING, "available",
                   1801:                       SYSCTL_DESCR("available algorithms"),
1.140     christos 1802:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.138     christos 1803:                       CTL_CREATE, CTL_EOL);
1.140     christos 1804:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.138     christos 1805:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1806:                       CTLTYPE_STRING, "selected",
                   1807:                       SYSCTL_DESCR("selected algorithm"),
1.140     christos 1808:                       sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN,
1.138     christos 1809:                       CTL_CREATE, CTL_EOL);
1.141     christos 1810:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1811:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1812:                       CTLTYPE_STRUCT, "reserve",
                   1813:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1814:                       sysctl_portalgo_reserve6, 0, NULL, 0,
                   1815:                       CTL_CREATE, CTL_EOL);
1.139     christos 1816:        sysctl_createv(clog, 0, NULL, NULL,
                   1817:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1818:                       CTLTYPE_INT, "neighborgcthresh",
                   1819:                       SYSCTL_DESCR("Maximum number of entries in neighbor"
                   1820:                        " cache"),
                   1821:                       NULL, 1, &ip6_neighborgcthresh, 0,
                   1822:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1823:                       CTL_CREATE, CTL_EOL);
                   1824:        sysctl_createv(clog, 0, NULL, NULL,
                   1825:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1826:                       CTLTYPE_INT, "maxifprefixes",
                   1827:                       SYSCTL_DESCR("Maximum number of prefixes created by"
                   1828:                           " route advertisement per interface"),
                   1829:                       NULL, 1, &ip6_maxifprefixes, 0,
                   1830:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1831:                       CTL_CREATE, CTL_EOL);
                   1832:        sysctl_createv(clog, 0, NULL, NULL,
                   1833:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1834:                       CTLTYPE_INT, "maxifdefrouters",
                   1835:                       SYSCTL_DESCR("Maximum number of default routers created"
                   1836:                           " by route advertisement per interface"),
                   1837:                       NULL, 1, &ip6_maxifdefrouters, 0,
                   1838:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1839:                       CTL_CREATE, CTL_EOL);
                   1840:        sysctl_createv(clog, 0, NULL, NULL,
                   1841:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1842:                       CTLTYPE_INT, "maxdynroutes",
                   1843:                       SYSCTL_DESCR("Maximum number of routes created via"
                   1844:                           " redirect"),
                   1845:                       NULL, 1, &ip6_maxdynroutes, 0,
                   1846:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1847:                       CTL_CREATE, CTL_EOL);
1.2       itojun   1848: }
1.116     thorpej  1849:
                   1850: void
                   1851: ip6_statinc(u_int stat)
                   1852: {
                   1853:
                   1854:        KASSERT(stat < IP6_NSTATS);
                   1855:        IP6_STATINC(stat);
                   1856: }

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