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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.136

1.136   ! drochner    1: /*     $NetBSD: ip6_input.c,v 1.135 2011/12/31 20:41:59 christos 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>
1.136   ! drochner   65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.135 2011/12/31 20:41:59 christos Exp $");
1.2       itojun     66:
1.129     joerg      67: #include "opt_gateway.h"
1.2       itojun     68: #include "opt_inet.h"
1.85      rpaulo     69: #include "opt_inet6.h"
1.4       thorpej    70: #include "opt_ipsec.h"
1.15      darrenr    71: #include "opt_pfil_hooks.h"
1.123     christos   72: #include "opt_compat_netbsd.h"
1.2       itojun     73:
                     74: #include <sys/param.h>
                     75: #include <sys/systm.h>
                     76: #include <sys/malloc.h>
                     77: #include <sys/mbuf.h>
                     78: #include <sys/domain.h>
                     79: #include <sys/protosw.h>
                     80: #include <sys/socket.h>
                     81: #include <sys/socketvar.h>
                     82: #include <sys/errno.h>
                     83: #include <sys/time.h>
                     84: #include <sys/kernel.h>
                     85: #include <sys/syslog.h>
                     86: #include <sys/proc.h>
1.46      simonb     87: #include <sys/sysctl.h>
1.133     tls        88: #include <sys/cprng.h>
1.2       itojun     89:
                     90: #include <net/if.h>
                     91: #include <net/if_types.h>
                     92: #include <net/if_dl.h>
                     93: #include <net/route.h>
                     94: #include <net/netisr.h>
1.15      darrenr    95: #ifdef PFIL_HOOKS
                     96: #include <net/pfil.h>
                     97: #endif
1.2       itojun     98:
                     99: #include <netinet/in.h>
1.9       itojun    100: #include <netinet/in_systm.h>
                    101: #ifdef INET
                    102: #include <netinet/ip.h>
                    103: #include <netinet/ip_icmp.h>
1.45      itojun    104: #endif /* INET */
1.14      itojun    105: #include <netinet/ip6.h>
1.2       itojun    106: #include <netinet6/in6_var.h>
1.11      itojun    107: #include <netinet6/ip6_var.h>
1.116     thorpej   108: #include <netinet6/ip6_private.h>
1.2       itojun    109: #include <netinet6/in6_pcb.h>
1.14      itojun    110: #include <netinet/icmp6.h>
1.81      rpaulo    111: #include <netinet6/scope6_var.h>
1.2       itojun    112: #include <netinet6/in6_ifattach.h>
                    113: #include <netinet6/nd6.h>
                    114:
1.134     drochner  115: #ifdef KAME_IPSEC
1.37      itojun    116: #include <netinet6/ipsec.h>
1.117     thorpej   117: #include <netinet6/ipsec_private.h>
1.37      itojun    118: #endif
                    119:
1.94      degroote  120: #ifdef FAST_IPSEC
                    121: #include <netipsec/ipsec.h>
                    122: #include <netipsec/ipsec6.h>
                    123: #include <netipsec/key.h>
                    124: #endif /* FAST_IPSEC */
                    125:
1.123     christos  126: #ifdef COMPAT_50
                    127: #include <compat/sys/time.h>
                    128: #include <compat/sys/socket.h>
                    129: #endif
                    130:
1.2       itojun    131: #include <netinet6/ip6protosw.h>
                    132:
                    133: #include "faith.h"
                    134: #include "gif.h"
1.50      itojun    135:
                    136: #if NGIF > 0
                    137: #include <netinet6/in6_gif.h>
                    138: #endif
1.2       itojun    139:
1.9       itojun    140: #include <net/net_osdep.h>
                    141:
1.2       itojun    142: extern struct domain inet6domain;
                    143:
                    144: u_char ip6_protox[IPPROTO_MAX];
                    145: static int ip6qmaxlen = IFQ_MAXLEN;
                    146: struct in6_ifaddr *in6_ifaddr;
                    147: struct ifqueue ip6intrq;
                    148:
1.108     ad        149: extern callout_t in6_tmpaddrtimer_ch;
1.83      rpaulo    150:
1.2       itojun    151: int ip6_forward_srcrt;                 /* XXX */
                    152: int ip6_sourcecheck;                   /* XXX */
                    153: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    154:
1.29      thorpej   155: #ifdef PFIL_HOOKS
                    156: struct pfil_head inet6_pfil_hook;
                    157: #endif
                    158:
1.116     thorpej   159: percpu_t *ip6stat_percpu;
1.2       itojun    160:
1.111     dyoung    161: static void ip6_init2(void *);
1.112     dyoung    162: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    163:
1.136   ! drochner  164: static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
        !           165:        u_int32_t *);
1.111     dyoung    166: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128     pooka     167: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2       itojun    168:
                    169: /*
                    170:  * IP6 initialization: fill in IP6 protocol switch table.
                    171:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    172:  */
                    173: void
1.114     matt      174: ip6_init(void)
1.2       itojun    175: {
1.78      christos  176:        const struct ip6protosw *pr;
1.35      itojun    177:        int i;
1.2       itojun    178:
1.128     pooka     179:        sysctl_net_inet6_ip6_setup(NULL);
1.78      christos  180:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    181:        if (pr == 0)
                    182:                panic("ip6_init");
                    183:        for (i = 0; i < IPPROTO_MAX; i++)
                    184:                ip6_protox[i] = pr - inet6sw;
1.78      christos  185:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    186:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    187:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    188:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    189:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    190:        ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81      rpaulo    191:        scope6_init();
                    192:        addrsel_policy_init();
1.2       itojun    193:        nd6_init();
                    194:        frag6_init();
1.133     tls       195:        ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    196:
1.135     christos  197:        ip6_init2(NULL);
1.98      liamjfoy  198: #ifdef GATEWAY
1.99      liamjfoy  199:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  200: #endif
1.29      thorpej   201:
                    202: #ifdef PFIL_HOOKS
                    203:        /* Register our Packet Filter hook. */
1.33      thorpej   204:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    205:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   206:        i = pfil_head_register(&inet6_pfil_hook);
                    207:        if (i != 0)
                    208:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    209:                    "error %d\n", i);
                    210: #endif /* PFIL_HOOKS */
1.116     thorpej   211:
                    212:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2       itojun    213: }
                    214:
                    215: static void
1.90      christos  216: ip6_init2(void *dummy)
1.2       itojun    217: {
                    218:
                    219:        /* nd6_timer_init */
1.118     ad        220:        callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19      thorpej   221:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    222:
                    223:        /* timer for regeneranation of temporary addresses randomize ID */
1.118     ad        224:        callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83      rpaulo    225:        callout_reset(&in6_tmpaddrtimer_ch,
                    226:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    227:                       ip6_temp_regen_advance) * hz,
                    228:                      in6_tmpaddrtimer, NULL);
1.2       itojun    229: }
                    230:
                    231: /*
                    232:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    233:  */
                    234: void
1.114     matt      235: ip6intr(void)
1.2       itojun    236: {
                    237:        int s;
                    238:        struct mbuf *m;
                    239:
1.118     ad        240:        mutex_enter(softnet_lock);
                    241:        KERNEL_LOCK(1, NULL);
1.2       itojun    242:        for (;;) {
1.41      thorpej   243:                s = splnet();
1.2       itojun    244:                IF_DEQUEUE(&ip6intrq, m);
                    245:                splx(s);
                    246:                if (m == 0)
1.118     ad        247:                        break;
1.83      rpaulo    248:                /* drop the packet if IPv6 operation is disabled on the IF */
                    249:                if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    250:                        m_freem(m);
1.118     ad        251:                        break;
1.83      rpaulo    252:                }
1.2       itojun    253:                ip6_input(m);
                    254:        }
1.118     ad        255:        KERNEL_UNLOCK_ONE(NULL);
                    256:        mutex_exit(softnet_lock);
1.2       itojun    257: }
                    258:
1.103     dyoung    259: extern struct  route ip6_forward_rt;
1.2       itojun    260:
                    261: void
1.96      dyoung    262: ip6_input(struct mbuf *m)
1.2       itojun    263: {
1.9       itojun    264:        struct ip6_hdr *ip6;
1.105     dyoung    265:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    266:        u_int32_t plen;
1.5       itojun    267:        u_int32_t rtalert = ~0;
1.104     yamt      268:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    269:        struct ifnet *deliverifp = NULL;
1.64      itojun    270:        int srcrt = 0;
1.105     dyoung    271:        const struct rtentry *rt;
                    272:        union {
                    273:                struct sockaddr         dst;
                    274:                struct sockaddr_in6     dst6;
                    275:        } u;
1.94      degroote  276: #ifdef FAST_IPSEC
                    277:        struct m_tag *mtag;
                    278:        struct tdb_ident *tdbi;
                    279:        struct secpolicy *sp;
                    280:        int s, error;
                    281: #endif
1.2       itojun    282:
1.134     drochner  283: #ifdef KAME_IPSEC
1.2       itojun    284:        /*
                    285:         * should the inner packet be considered authentic?
                    286:         * see comment in ah4_input().
                    287:         */
1.49      itojun    288:        m->m_flags &= ~M_AUTHIPHDR;
                    289:        m->m_flags &= ~M_AUTHIPDGM;
1.2       itojun    290: #endif
1.9       itojun    291:
1.2       itojun    292:        /*
1.81      rpaulo    293:         * make sure we don't have onion peering information into m_tag.
                    294:         */
                    295:        ip6_delaux(m);
                    296:
                    297:        /*
1.44      itojun    298:         * mbuf statistics
1.2       itojun    299:         */
                    300:        if (m->m_flags & M_EXT) {
                    301:                if (m->m_next)
1.116     thorpej   302:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    303:                else
1.116     thorpej   304:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    305:        } else {
1.115     thorpej   306: #define M2MMAX 32
1.2       itojun    307:                if (m->m_next) {
1.9       itojun    308:                        if (m->m_flags & M_LOOP) {
1.116     thorpej   309:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115     thorpej   310:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116     thorpej   311:                                IP6_STATINC(IP6_STAT_M2M +
                    312:                                            m->m_pkthdr.rcvif->if_index);
1.115     thorpej   313:                        } else
1.116     thorpej   314:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    315:                } else
1.116     thorpej   316:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    317: #undef M2MMAX
1.2       itojun    318:        }
                    319:
1.9       itojun    320:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116     thorpej   321:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    322:
1.57      thorpej   323:        /*
                    324:         * If the IPv6 header is not aligned, slurp it up into a new
                    325:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    326:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   327:         * IPv6 header is in the first mbuf of the chain.
                    328:         */
1.97      christos  329:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   330:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    331:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    332:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    333:                        /* XXXJRT new stat, please */
1.116     thorpej   334:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.57      thorpej   335:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    336:                        return;
                    337:                }
                    338:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    339:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    340:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116     thorpej   341:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.9       itojun    342:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    343:                        return;
                    344:                }
1.2       itojun    345:        }
                    346:
                    347:        ip6 = mtod(m, struct ip6_hdr *);
                    348:
                    349:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116     thorpej   350:                IP6_STATINC(IP6_STAT_BADVERS);
1.9       itojun    351:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    352:                goto bad;
                    353:        }
1.15      darrenr   354:
1.134     drochner  355: #if defined(KAME_IPSEC)
1.98      liamjfoy  356:        /* IPv6 fast forwarding is not compatible with IPsec. */
                    357:        m->m_flags &= ~M_CANFASTFWD;
                    358: #else
                    359:        /*
                    360:         * Assume that we can create a fast-forward IP flow entry
                    361:         * based on this packet.
                    362:         */
                    363:        m->m_flags |= M_CANFASTFWD;
                    364: #endif
                    365:
1.15      darrenr   366: #ifdef PFIL_HOOKS
                    367:        /*
                    368:         * Run through list of hooks for input packets.  If there are any
                    369:         * filters which require that additional packets in the flow are
                    370:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    371:         * Note that filters must _never_ set this flag, as another filter
                    372:         * in the list may have previously cleared it.
                    373:         */
1.39      itojun    374:        /*
                    375:         * let ipfilter look at packet on the wire,
                    376:         * not the decapsulated packet.
                    377:         */
1.134     drochner  378: #ifdef KAME_IPSEC
1.42      itojun    379:        if (!ipsec_getnhist(m))
1.94      degroote  380: #elif defined(FAST_IPSEC)
                    381:        if (!ipsec_indone(m))
1.39      itojun    382: #else
                    383:        if (1)
                    384: #endif
                    385:        {
1.64      itojun    386:                struct in6_addr odst;
                    387:
                    388:                odst = ip6->ip6_dst;
1.39      itojun    389:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    390:                                   PFIL_IN) != 0)
                    391:                        return;
                    392:                if (m == NULL)
                    393:                        return;
                    394:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    395:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    396:        }
1.15      darrenr   397: #endif /* PFIL_HOOKS */
                    398:
1.116     thorpej   399:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    400:
1.30      thorpej   401: #ifdef ALTQ
                    402:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    403:                /* packet is dropped by traffic conditioner */
                    404:                return;
1.9       itojun    405:        }
                    406: #endif
                    407:
1.2       itojun    408:        /*
1.44      itojun    409:         * Check against address spoofing/corruption.
1.2       itojun    410:         */
                    411:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    412:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    413:                /*
                    414:                 * XXX: "badscope" is not very suitable for a multicast source.
                    415:                 */
1.116     thorpej   416:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.9       itojun    417:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    418:                goto bad;
                    419:        }
1.13      itojun    420:        /*
1.44      itojun    421:         * The following check is not documented in specs.  A malicious
                    422:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    423:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    424:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    425:         *
1.44      itojun    426:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    427:         * support IPv4-less kernel compilation, we cannot support SIIT
                    428:         * environment at all.  So, it makes more sense for us to reject any
                    429:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       430:         * partial support for SIIT environment.
1.13      itojun    431:         */
                    432:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    433:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   434:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    435:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    436:                goto bad;
                    437:        }
1.17      itojun    438: #if 0
1.13      itojun    439:        /*
1.17      itojun    440:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    441:         *
                    442:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    443:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    444:         * is revised to forbid relaying case.
1.13      itojun    445:         */
                    446:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    447:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116     thorpej   448:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    449:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    450:                goto bad;
                    451:        }
                    452: #endif
1.35      itojun    453:
1.2       itojun    454:        /*
1.82      yamt      455:         * Disambiguate address scope zones (if there is ambiguity).
                    456:         * We first make sure that the original source or destination address
                    457:         * is not in our internal form for scoped addresses.  Such addresses
                    458:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    459:         * to the usage conflict.
                    460:         * in6_setscope() then also checks and rejects the cases where src or
                    461:         * dst are the loopback address and the receiving interface
                    462:         * is not loopback.
                    463:         */
1.88      bouyer    464:        if (__predict_false(
                    465:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    466:                goto bad;
                    467:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      468:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116     thorpej   469:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      470:                goto bad;
                    471:        }
                    472:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    473:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116     thorpej   474:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      475:                goto bad;
                    476:        }
                    477:
                    478:        /*
1.2       itojun    479:         * Multicast check
                    480:         */
                    481:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    482:                struct  in6_multi *in6m = 0;
1.9       itojun    483:
                    484:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    485:                /*
                    486:                 * See if we belong to the destination multicast group on the
                    487:                 * arrival interface.
                    488:                 */
                    489:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    490:                if (in6m)
                    491:                        ours = 1;
                    492:                else if (!ip6_mrouter) {
1.116     thorpej   493:                        uint64_t *ip6s = IP6_STAT_GETREF();
                    494:                        ip6s[IP6_STAT_NOTMEMBER]++;
                    495:                        ip6s[IP6_STAT_CANTFORWARD]++;
                    496:                        IP6_STAT_PUTREF();
1.9       itojun    497:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    498:                        goto bad;
                    499:                }
1.9       itojun    500:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    501:                goto hbhcheck;
                    502:        }
                    503:
1.105     dyoung    504:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    505:
1.2       itojun    506:        /*
                    507:         *  Unicast check
                    508:         */
1.105     dyoung    509:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
                    510:        if (hit)
1.116     thorpej   511:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     512:        else
1.116     thorpej   513:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    514:
1.109     dyoung    515: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2       itojun    516:
                    517:        /*
                    518:         * Accept the packet if the forwarding interface to the destination
                    519:         * according to the routing table is the loopback interface,
                    520:         * unless the associated route has a gateway.
                    521:         * Note that this approach causes to accept a packet if there is a
                    522:         * route to the loopback interface for the destination of the packet.
                    523:         * But we think it's even useful in some situations, e.g. when using
                    524:         * a special daemon which wants to intercept the packet.
                    525:         */
1.105     dyoung    526:        if (rt != NULL &&
                    527:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    528:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    529: #if 0
                    530:            /*
                    531:             * The check below is redundant since the comparison of
                    532:             * the destination and the key of the rtentry has
                    533:             * already done through looking up the routing table.
                    534:             */
1.109     dyoung    535:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2       itojun    536: #endif
1.105     dyoung    537:            rt->rt_ifp->if_type == IFT_LOOP) {
                    538:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    539:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    540:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    541:                /*
                    542:                 * packets to a tentative, duplicated, or somehow invalid
                    543:                 * address must not be accepted.
                    544:                 */
1.2       itojun    545:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    546:                        /* this address is ready */
1.2       itojun    547:                        ours = 1;
1.9       itojun    548:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    549:                        goto hbhcheck;
                    550:                } else {
1.24      itojun    551:                        /* address is not ready, so discard the packet. */
1.34      itojun    552:                        nd6log((LOG_INFO,
1.27      itojun    553:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    554:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    555:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    556:
                    557:                        goto bad;
1.2       itojun    558:                }
                    559:        }
                    560:
                    561:        /*
1.55      itojun    562:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    563:         */
                    564: #if defined(NFAITH) && 0 < NFAITH
                    565:        if (ip6_keepfaith) {
1.105     dyoung    566:                if (rt != NULL && rt->rt_ifp != NULL &&
                    567:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    568:                        /* XXX do we need more sanity checks? */
                    569:                        ours = 1;
1.105     dyoung    570:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    571:                        goto hbhcheck;
                    572:                }
                    573:        }
                    574: #endif
                    575:
                    576: #if 0
                    577:     {
                    578:        /*
                    579:         * Last resort: check in6_ifaddr for incoming interface.
                    580:         * The code is here until I update the "goto ours hack" code above
                    581:         * working right.
                    582:         */
                    583:        struct ifaddr *ifa;
1.113     dyoung    584:        IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9       itojun    585:                if (ifa->ifa_addr == NULL)
                    586:                        continue;       /* just for safety */
                    587:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    588:                        continue;
                    589:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    590:                        ours = 1;
                    591:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    592:                        goto hbhcheck;
                    593:                }
                    594:        }
1.9       itojun    595:     }
1.2       itojun    596: #endif
                    597:
                    598:        /*
                    599:         * Now there is no reason to process the packet if it's not our own
                    600:         * and we're not a router.
                    601:         */
                    602:        if (!ip6_forwarding) {
1.116     thorpej   603:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9       itojun    604:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    605:                goto bad;
                    606:        }
                    607:
                    608:   hbhcheck:
                    609:        /*
1.81      rpaulo    610:         * record address information into m_tag, if we don't have one yet.
                    611:         * note that we are unable to record it, if the address is not listed
                    612:         * as our interface address (e.g. multicast addresses, addresses
                    613:         * within FAITH prefixes and such).
                    614:         */
1.111     dyoung    615:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    616:                struct in6_ifaddr *ia6;
                    617:
                    618:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111     dyoung    619:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    620:                        /*
                    621:                         * XXX maybe we should drop the packet here,
                    622:                         * as we could not provide enough information
                    623:                         * to the upper layers.
                    624:                         */
1.81      rpaulo    625:                }
                    626:        }
                    627:
                    628:        /*
1.2       itojun    629:         * Process Hop-by-Hop options header if it's contained.
                    630:         * m may be modified in ip6_hopopts_input().
                    631:         * If a JumboPayload option is included, plen will also be modified.
                    632:         */
                    633:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    634:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    635:                struct ip6_hbh *hbh;
                    636:
                    637:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    638: #if 0  /*touches NULL pointer*/
                    639:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    640: #endif
1.2       itojun    641:                        return; /* m have already been freed */
1.9       itojun    642:                }
1.22      itojun    643:
1.2       itojun    644:                /* adjust pointer */
                    645:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    646:
                    647:                /*
1.49      itojun    648:                 * if the payload length field is 0 and the next header field
1.22      itojun    649:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    650:                 * option MUST be included.
                    651:                 */
                    652:                if (ip6->ip6_plen == 0 && plen == 0) {
                    653:                        /*
                    654:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    655:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    656:                         * (non-zero) payload length to the variable plen.
1.22      itojun    657:                         */
1.116     thorpej   658:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    659:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    660:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    661:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    662:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  663:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    664:                        return;
                    665:                }
1.9       itojun    666:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    667:                        sizeof(struct ip6_hbh));
                    668:                if (hbh == NULL) {
1.116     thorpej   669:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    670:                        return;
                    671:                }
1.57      thorpej   672:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    673:                nxt = hbh->ip6h_nxt;
1.2       itojun    674:
                    675:                /*
                    676:                 * accept the packet if a router alert option is included
                    677:                 * and we act as an IPv6 router.
                    678:                 */
1.5       itojun    679:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    680:                        ours = 1;
                    681:        } else
                    682:                nxt = ip6->ip6_nxt;
                    683:
                    684:        /*
                    685:         * Check that the amount of data in the buffers
                    686:         * is as at least much as the IPv6 header would have us expect.
                    687:         * Trim mbufs if longer than we expect.
                    688:         * Drop packet if shorter than we expect.
                    689:         */
                    690:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116     thorpej   691:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    692:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    693:                goto bad;
                    694:        }
                    695:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    696:                if (m->m_len == m->m_pkthdr.len) {
                    697:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    698:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    699:                } else
                    700:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    701:        }
                    702:
                    703:        /*
                    704:         * Forward if desirable.
                    705:         */
                    706:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    707:                /*
                    708:                 * If we are acting as a multicast router, all
                    709:                 * incoming multicast packets are passed to the
                    710:                 * kernel-level multicast forwarding function.
                    711:                 * The packet is returned (relatively) intact; if
                    712:                 * ip6_mforward() returns a non-zero value, the packet
                    713:                 * must be discarded, else it may be accepted below.
                    714:                 */
                    715:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116     thorpej   716:                        IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2       itojun    717:                        m_freem(m);
                    718:                        return;
                    719:                }
                    720:                if (!ours) {
                    721:                        m_freem(m);
                    722:                        return;
                    723:                }
1.22      itojun    724:        } else if (!ours) {
1.64      itojun    725:                ip6_forward(m, srcrt);
1.2       itojun    726:                return;
1.56      itojun    727:        }
1.25      itojun    728:
                    729:        ip6 = mtod(m, struct ip6_hdr *);
                    730:
                    731:        /*
                    732:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    733:         * tcp/udp stack and bypass security checks (act as if it was from
                    734:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    735:         *
                    736:         * For SIIT end node behavior, you may want to disable the check.
                    737:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    738:         * source.
                    739:         */
                    740:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    741:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   742:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.25      itojun    743:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    744:                goto bad;
                    745:        }
1.2       itojun    746:
                    747:        /*
                    748:         * Tell launch routine the next header
                    749:         */
1.12      itojun    750: #ifdef IFA_STATS
1.28      itojun    751:        if (deliverifp != NULL) {
1.9       itojun    752:                struct in6_ifaddr *ia6;
                    753:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    754:                if (ia6)
                    755:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    756:        }
                    757: #endif
1.116     thorpej   758:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    759:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    760:        nest = 0;
1.40      itojun    761:
1.104     yamt      762:        rh_present = 0;
1.2       itojun    763:        while (nxt != IPPROTO_DONE) {
                    764:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116     thorpej   765:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104     yamt      766:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    767:                        goto bad;
                    768:                }
1.8       itojun    769:
                    770:                /*
                    771:                 * protection against faulty packet - there should be
                    772:                 * more sanity checks in header chain processing.
                    773:                 */
                    774:                if (m->m_pkthdr.len < off) {
1.116     thorpej   775:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    776:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    777:                        goto bad;
                    778:                }
                    779:
1.104     yamt      780:                if (nxt == IPPROTO_ROUTING) {
                    781:                        if (rh_present++) {
                    782:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
                    783:                                    ifs6_in_hdrerr);
1.116     thorpej   784:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      785:                                goto bad;
                    786:                        }
                    787:                }
                    788:
1.134     drochner  789: #ifdef KAME_IPSEC
1.37      itojun    790:                /*
                    791:                 * enforce IPsec policy checking if we are seeing last header.
                    792:                 * note that we do not visit this with protocols with pcb layer
                    793:                 * code - like udp/tcp/raw ip.
                    794:                 */
                    795:                if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
                    796:                    ipsec6_in_reject(m, NULL)) {
1.117     thorpej   797:                        IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
1.37      itojun    798:                        goto bad;
                    799:                }
                    800: #endif
1.94      degroote  801: #ifdef FAST_IPSEC
                    802:        /*
                    803:         * enforce IPsec policy checking if we are seeing last header.
                    804:         * note that we do not visit this with protocols with pcb layer
                    805:         * code - like udp/tcp/raw ip.
                    806:         */
                    807:        if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
                    808:                /*
                    809:                 * Check if the packet has already had IPsec processing
                    810:                 * done.  If so, then just pass it along.  This tag gets
                    811:                 * set during AH, ESP, etc. input handling, before the
                    812:                 * packet is returned to the ip input queue for delivery.
                    813:                 */
                    814:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    815:                s = splsoftnet();
                    816:                if (mtag != NULL) {
                    817:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    818:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    819:                } else {
                    820:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    821:                                                                        IP_FORWARDING, &error);
                    822:                }
                    823:                if (sp != NULL) {
                    824:                        /*
                    825:                         * Check security policy against packet attributes.
                    826:                         */
                    827:                        error = ipsec_in_reject(sp, m);
                    828:                        KEY_FREESP(&sp);
                    829:                } else {
                    830:                        /* XXX error stat??? */
                    831:                        error = EINVAL;
                    832:                        DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
                    833:                }
                    834:                splx(s);
                    835:                if (error)
                    836:                        goto bad;
                    837:        }
                    838: #endif /* FAST_IPSEC */
                    839:
1.56      itojun    840:
1.2       itojun    841:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    842:        }
                    843:        return;
                    844:  bad:
                    845:        m_freem(m);
                    846: }
                    847:
                    848: /*
1.81      rpaulo    849:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    850:  */
                    851: static struct m_tag *
1.112     dyoung    852: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    853: {
                    854:        struct m_tag *mtag;
                    855:
                    856:        mtag = ip6_addaux(m);
1.112     dyoung    857:        if (mtag != NULL) {
                    858:                struct ip6aux *ip6a;
                    859:
                    860:                ip6a = (struct ip6aux *)(mtag + 1);
                    861:                in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
                    862:                ip6a->ip6a_src = ia->ia_addr.sin6_addr;
                    863:                ip6a->ip6a_flags = ia->ia6_flags;
                    864:        }
1.81      rpaulo    865:        return mtag;    /* NULL if failed to set */
                    866: }
                    867:
1.112     dyoung    868: const struct ip6aux *
1.107     christos  869: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    870: {
                    871:        struct m_tag *mtag;
                    872:
                    873:        mtag = ip6_findaux(m);
1.112     dyoung    874:        if (mtag != NULL)
                    875:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    876:        else
                    877:                return NULL;
                    878: }
                    879:
                    880: /*
1.2       itojun    881:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    882:  * included, the real payload length will be stored in plenp.
1.107     christos  883:  *
                    884:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    885:  */
1.136   ! drochner  886: int
1.107     christos  887: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
                    888:        struct mbuf **mp, int *offp)
1.2       itojun    889: {
1.35      itojun    890:        struct mbuf *m = *mp;
1.2       itojun    891:        int off = *offp, hbhlen;
                    892:        struct ip6_hbh *hbh;
                    893:
                    894:        /* validation of the length of the header */
1.9       itojun    895:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    896:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    897:        if (hbh == NULL) {
1.116     thorpej   898:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    899:                return -1;
                    900:        }
                    901:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    902:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    903:                hbhlen);
                    904:        if (hbh == NULL) {
1.116     thorpej   905:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    906:                return -1;
                    907:        }
1.57      thorpej   908:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    909:        off += hbhlen;
                    910:        hbhlen -= sizeof(struct ip6_hbh);
                    911:
                    912:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    913:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    914:                return (-1);
1.2       itojun    915:
                    916:        *offp = off;
                    917:        *mp = m;
1.58      itojun    918:        return (0);
1.2       itojun    919: }
                    920:
                    921: /*
                    922:  * Search header for all Hop-by-hop options and process each option.
                    923:  * This function is separate from ip6_hopopts_input() in order to
                    924:  * handle a case where the sending node itself process its hop-by-hop
                    925:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    926:  *
                    927:  * The function assumes that hbh header is located right after the IPv6 header
                    928:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    929:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    930:  */
1.136   ! drochner  931: static int
1.107     christos  932: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
                    933:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    934: {
                    935:        struct ip6_hdr *ip6;
                    936:        int optlen = 0;
                    937:        u_int8_t *opt = opthead;
                    938:        u_int16_t rtalert_val;
1.22      itojun    939:        u_int32_t jumboplen;
1.55      itojun    940:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    941:
                    942:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    943:                switch (*opt) {
                    944:                case IP6OPT_PAD1:
                    945:                        optlen = 1;
                    946:                        break;
                    947:                case IP6OPT_PADN:
                    948:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   949:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    950:                                goto bad;
                    951:                        }
                    952:                        optlen = *(opt + 1) + 2;
                    953:                        break;
                    954:                case IP6OPT_RTALERT:
                    955:                        /* XXX may need check for alignment */
                    956:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116     thorpej   957:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    958:                                goto bad;
                    959:                        }
                    960:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    961:                                /* XXX stat */
                    962:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    963:                                    ICMP6_PARAMPROB_HEADER,
                    964:                                    erroff + opt + 1 - opthead);
                    965:                                return (-1);
1.35      itojun    966:                        }
                    967:                        optlen = IP6OPT_RTALERT_LEN;
1.126     tsutsui   968:                        memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35      itojun    969:                        *rtalertp = ntohs(rtalert_val);
                    970:                        break;
                    971:                case IP6OPT_JUMBO:
1.22      itojun    972:                        /* XXX may need check for alignment */
                    973:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116     thorpej   974:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    975:                                goto bad;
                    976:                        }
1.35      itojun    977:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    978:                                /* XXX stat */
                    979:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    980:                                    ICMP6_PARAMPROB_HEADER,
                    981:                                    erroff + opt + 1 - opthead);
                    982:                                return (-1);
1.35      itojun    983:                        }
1.22      itojun    984:                        optlen = IP6OPT_JUMBO_LEN;
                    985:
                    986:                        /*
                    987:                         * IPv6 packets that have non 0 payload length
1.35      itojun    988:                         * must not contain a jumbo payload option.
1.22      itojun    989:                         */
                    990:                        ip6 = mtod(m, struct ip6_hdr *);
                    991:                        if (ip6->ip6_plen) {
1.116     thorpej   992:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    993:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    994:                                    ICMP6_PARAMPROB_HEADER,
                    995:                                    erroff + opt - opthead);
                    996:                                return (-1);
1.22      itojun    997:                        }
1.2       itojun    998:
1.22      itojun    999:                        /*
                   1000:                         * We may see jumbolen in unaligned location, so
                   1001:                         * we'd need to perform bcopy().
                   1002:                         */
1.126     tsutsui  1003:                        memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22      itojun   1004:                        jumboplen = (u_int32_t)htonl(jumboplen);
                   1005:
                   1006: #if 1
                   1007:                        /*
                   1008:                         * if there are multiple jumbo payload options,
                   1009:                         * *plenp will be non-zero and the packet will be
                   1010:                         * rejected.
                   1011:                         * the behavior may need some debate in ipngwg -
                   1012:                         * multiple options does not make sense, however,
                   1013:                         * there's no explicit mention in specification.
                   1014:                         */
                   1015:                        if (*plenp != 0) {
1.116     thorpej  1016:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun   1017:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1018:                                    ICMP6_PARAMPROB_HEADER,
                   1019:                                    erroff + opt + 2 - opthead);
                   1020:                                return (-1);
1.22      itojun   1021:                        }
1.8       itojun   1022: #endif
1.2       itojun   1023:
1.22      itojun   1024:                        /*
                   1025:                         * jumbo payload length must be larger than 65535.
                   1026:                         */
                   1027:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116     thorpej  1028:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun   1029:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun   1030:                                    ICMP6_PARAMPROB_HEADER,
                   1031:                                    erroff + opt + 2 - opthead);
                   1032:                                return (-1);
1.22      itojun   1033:                        }
                   1034:                        *plenp = jumboplen;
                   1035:
                   1036:                        break;
1.35      itojun   1037:                default:                /* unknown option */
                   1038:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej  1039:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun   1040:                                goto bad;
                   1041:                        }
1.55      itojun   1042:                        optlen = ip6_unknown_opt(opt, m,
                   1043:                            erroff + opt - opthead);
                   1044:                        if (optlen == -1)
                   1045:                                return (-1);
1.35      itojun   1046:                        optlen += 2;
                   1047:                        break;
1.2       itojun   1048:                }
                   1049:        }
                   1050:
1.55      itojun   1051:        return (0);
1.2       itojun   1052:
                   1053:   bad:
                   1054:        m_freem(m);
1.55      itojun   1055:        return (-1);
1.2       itojun   1056: }
                   1057:
                   1058: /*
                   1059:  * Unknown option processing.
                   1060:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1061:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1062:  * is not continuous in order to return an ICMPv6 error.
                   1063:  */
                   1064: int
1.107     christos 1065: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun   1066: {
                   1067:        struct ip6_hdr *ip6;
                   1068:
1.35      itojun   1069:        switch (IP6OPT_TYPE(*optp)) {
                   1070:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1071:                return ((int)*(optp + 1));
1.35      itojun   1072:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1073:                m_freem(m);
1.58      itojun   1074:                return (-1);
1.35      itojun   1075:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116     thorpej  1076:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1077:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1078:                return (-1);
1.35      itojun   1079:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116     thorpej  1080:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1081:                ip6 = mtod(m, struct ip6_hdr *);
                   1082:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1083:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1084:                        m_freem(m);
                   1085:                else
                   1086:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1087:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1088:                return (-1);
1.2       itojun   1089:        }
                   1090:
                   1091:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1092:        return (-1);
1.2       itojun   1093: }
                   1094:
                   1095: /*
1.9       itojun   1096:  * Create the "control" list for this pcb.
                   1097:  *
                   1098:  * The routine will be called from upper layer handlers like tcp6_input().
                   1099:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1100:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1101:  * very first mbuf on the mbuf chain.
                   1102:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1103:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1104:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1105:  */
                   1106: void
1.107     christos 1107: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
                   1108:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1109: {
1.85      rpaulo   1110: #ifdef RFC2292
                   1111: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1112: #else
                   1113: #define IS2292(x, y)   (y)
                   1114: #endif
                   1115:
1.123     christos 1116:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP
                   1117: #ifdef SO_OTIMESTAMP
                   1118:            || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                   1119: #endif
                   1120:        ) {
1.2       itojun   1121:                struct timeval tv;
                   1122:
                   1123:                microtime(&tv);
1.123     christos 1124: #ifdef SO_OTIMESTAMP
                   1125:                if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
                   1126:                        struct timeval50 tv50;
                   1127:                        timeval_to_timeval50(&tv, &tv50);
                   1128:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1129:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1130:                } else
                   1131: #endif
1.97      christos 1132:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1133:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1134:                if (*mp)
                   1135:                        mp = &(*mp)->m_next;
                   1136:        }
1.87      rpaulo   1137:
                   1138:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1139:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1140:                return;
                   1141:
1.2       itojun   1142:        /* RFC 2292 sec. 5 */
1.35      itojun   1143:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1144:                struct in6_pktinfo pi6;
1.85      rpaulo   1145:
1.126     tsutsui  1146:                memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81      rpaulo   1147:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1148:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1149:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1150:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1151:                    sizeof(struct in6_pktinfo),
                   1152:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1153:                if (*mp)
                   1154:                        mp = &(*mp)->m_next;
                   1155:        }
1.85      rpaulo   1156:
1.2       itojun   1157:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1158:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1159:
1.97      christos 1160:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1161:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1162:                if (*mp)
                   1163:                        mp = &(*mp)->m_next;
                   1164:        }
                   1165:
                   1166:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1167:                u_int32_t flowinfo;
                   1168:                int tclass;
                   1169:
                   1170:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1171:                flowinfo >>= 20;
                   1172:
                   1173:                tclass = flowinfo & 0xff;
1.97      christos 1174:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1175:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1176:
1.2       itojun   1177:                if (*mp)
                   1178:                        mp = &(*mp)->m_next;
                   1179:        }
                   1180:
                   1181:        /*
1.75      itojun   1182:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1183:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1184:         * strict, since there might be some hop-by-hop options which can be
                   1185:         * returned to normal user.
1.85      rpaulo   1186:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1187:         */
1.75      itojun   1188:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1189:                /*
                   1190:                 * Check if a hop-by-hop options header is contatined in the
                   1191:                 * received packet, and if so, store the options as ancillary
                   1192:                 * data. Note that a hop-by-hop options header must be
                   1193:                 * just after the IPv6 header, which fact is assured through
                   1194:                 * the IPv6 input processing.
                   1195:                 */
1.78      christos 1196:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1197:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1198:                        struct ip6_hbh *hbh;
                   1199:                        int hbhlen;
1.62      itojun   1200:                        struct mbuf *ext;
1.9       itojun   1201:
1.62      itojun   1202:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1203:                            xip6->ip6_nxt);
1.62      itojun   1204:                        if (ext == NULL) {
1.116     thorpej  1205:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1206:                                return;
                   1207:                        }
1.62      itojun   1208:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1209:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1210:                        if (hbhlen != ext->m_len) {
                   1211:                                m_freem(ext);
1.116     thorpej  1212:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1213:                                return;
                   1214:                        }
1.2       itojun   1215:
                   1216:                        /*
                   1217:                         * XXX: We copy whole the header even if a jumbo
                   1218:                         * payload option is included, which option is to
                   1219:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1220:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1221:                         */
1.97      christos 1222:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1223:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1224:                            IPPROTO_IPV6);
1.2       itojun   1225:                        if (*mp)
                   1226:                                mp = &(*mp)->m_next;
1.62      itojun   1227:                        m_freem(ext);
1.2       itojun   1228:                }
                   1229:        }
                   1230:
                   1231:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1232:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1233:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1234:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1235:
                   1236:                /*
                   1237:                 * Search for destination options headers or routing
                   1238:                 * header(s) through the header chain, and stores each
                   1239:                 * header as ancillary data.
                   1240:                 * Note that the order of the headers remains in
                   1241:                 * the chain of ancillary data.
                   1242:                 */
1.86      rpaulo   1243:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1244:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1245:                        int elen;
1.62      itojun   1246:                        struct mbuf *ext = NULL;
1.9       itojun   1247:
1.62      itojun   1248:                        /*
                   1249:                         * if it is not an extension header, don't try to
                   1250:                         * pull it from the chain.
                   1251:                         */
                   1252:                        switch (nxt) {
                   1253:                        case IPPROTO_DSTOPTS:
                   1254:                        case IPPROTO_ROUTING:
                   1255:                        case IPPROTO_HOPOPTS:
                   1256:                        case IPPROTO_AH: /* is it possible? */
                   1257:                                break;
                   1258:                        default:
                   1259:                                goto loopend;
                   1260:                        }
                   1261:
                   1262:                        ext = ip6_pullexthdr(m, off, nxt);
                   1263:                        if (ext == NULL) {
1.116     thorpej  1264:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1265:                                return;
                   1266:                        }
1.62      itojun   1267:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1268:                        if (nxt == IPPROTO_AH)
                   1269:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1270:                        else
                   1271:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1272:                        if (elen != ext->m_len) {
                   1273:                                m_freem(ext);
1.116     thorpej  1274:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1275:                                return;
                   1276:                        }
1.57      thorpej  1277:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1278:
1.35      itojun   1279:                        switch (nxt) {
1.62      itojun   1280:                        case IPPROTO_DSTOPTS:
1.127     martin   1281:                                if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35      itojun   1282:                                        break;
                   1283:
1.97      christos 1284:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1285:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1286:                                    IPPROTO_IPV6);
1.35      itojun   1287:                                if (*mp)
                   1288:                                        mp = &(*mp)->m_next;
                   1289:                                break;
                   1290:
                   1291:                        case IPPROTO_ROUTING:
1.127     martin   1292:                                if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35      itojun   1293:                                        break;
                   1294:
1.97      christos 1295:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1296:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1297:                                    IPPROTO_IPV6);
1.35      itojun   1298:                                if (*mp)
                   1299:                                        mp = &(*mp)->m_next;
                   1300:                                break;
                   1301:
1.62      itojun   1302:                        case IPPROTO_HOPOPTS:
                   1303:                        case IPPROTO_AH: /* is it possible? */
                   1304:                                break;
                   1305:
1.35      itojun   1306:                        default:
                   1307:                                /*
1.62      itojun   1308:                                 * other cases have been filtered in the above.
                   1309:                                 * none will visit this case.  here we supply
                   1310:                                 * the code just in case (nxt overwritten or
                   1311:                                 * other cases).
1.35      itojun   1312:                                 */
1.62      itojun   1313:                                m_freem(ext);
1.35      itojun   1314:                                goto loopend;
                   1315:
1.2       itojun   1316:                        }
                   1317:
                   1318:                        /* proceed with the next header. */
1.9       itojun   1319:                        off += elen;
1.2       itojun   1320:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1321:                        ip6e = NULL;
                   1322:                        m_freem(ext);
                   1323:                        ext = NULL;
1.2       itojun   1324:                }
                   1325:          loopend:
1.62      itojun   1326:                ;
1.2       itojun   1327:        }
1.62      itojun   1328: }
1.85      rpaulo   1329: #undef IS2292
                   1330:
                   1331:
                   1332: void
1.95      dyoung   1333: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1334:     uint32_t *mtu)
1.85      rpaulo   1335: {
                   1336:        struct socket *so;
                   1337:        struct mbuf *m_mtu;
                   1338:        struct ip6_mtuinfo mtuctl;
                   1339:
                   1340:        so = in6p->in6p_socket;
                   1341:
                   1342:        if (mtu == NULL)
                   1343:                return;
                   1344:
                   1345: #ifdef DIAGNOSTIC
                   1346:        if (so == NULL)         /* I believe this is impossible */
                   1347:                panic("ip6_notify_pmtu: socket is NULL");
                   1348: #endif
                   1349:
                   1350:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1351:        mtuctl.ip6m_mtu = *mtu;
                   1352:        mtuctl.ip6m_addr = *dst;
                   1353:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1354:                return;
                   1355:
1.97      christos 1356:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1357:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1358:                return;
                   1359:
1.95      dyoung   1360:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1361:            == 0) {
                   1362:                m_freem(m_mtu);
                   1363:                /* XXX: should count statistics */
                   1364:        } else
                   1365:                sorwakeup(so);
                   1366:
                   1367:        return;
                   1368: }
1.62      itojun   1369:
                   1370: /*
                   1371:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1372:  * contains the result, or NULL on error.
                   1373:  */
                   1374: static struct mbuf *
1.107     christos 1375: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1376: {
                   1377:        struct ip6_ext ip6e;
                   1378:        size_t elen;
                   1379:        struct mbuf *n;
                   1380:
                   1381: #ifdef DIAGNOSTIC
                   1382:        switch (nxt) {
                   1383:        case IPPROTO_DSTOPTS:
                   1384:        case IPPROTO_ROUTING:
                   1385:        case IPPROTO_HOPOPTS:
                   1386:        case IPPROTO_AH: /* is it possible? */
                   1387:                break;
                   1388:        default:
                   1389:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1390:        }
1.62      itojun   1391: #endif
1.2       itojun   1392:
1.97      christos 1393:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1394:        if (nxt == IPPROTO_AH)
                   1395:                elen = (ip6e.ip6e_len + 2) << 2;
                   1396:        else
                   1397:                elen = (ip6e.ip6e_len + 1) << 3;
                   1398:
                   1399:        MGET(n, M_DONTWAIT, MT_DATA);
                   1400:        if (n && elen >= MLEN) {
                   1401:                MCLGET(n, M_DONTWAIT);
                   1402:                if ((n->m_flags & M_EXT) == 0) {
                   1403:                        m_free(n);
                   1404:                        n = NULL;
                   1405:                }
                   1406:        }
                   1407:        if (!n)
                   1408:                return NULL;
                   1409:
                   1410:        n->m_len = 0;
                   1411:        if (elen >= M_TRAILINGSPACE(n)) {
                   1412:                m_free(n);
                   1413:                return NULL;
                   1414:        }
                   1415:
1.97      christos 1416:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1417:        n->m_len = elen;
                   1418:        return n;
1.2       itojun   1419: }
                   1420:
                   1421: /*
                   1422:  * Get pointer to the previous header followed by the header
                   1423:  * currently processed.
                   1424:  * XXX: This function supposes that
                   1425:  *     M includes all headers,
                   1426:  *     the next header field and the header length field of each header
                   1427:  *     are valid, and
                   1428:  *     the sum of each header length equals to OFF.
                   1429:  * Because of these assumptions, this function must be called very
                   1430:  * carefully. Moreover, it will not be used in the near future when
                   1431:  * we develop `neater' mechanism to process extension headers.
                   1432:  */
1.58      itojun   1433: u_int8_t *
1.107     christos 1434: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1435: {
                   1436:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1437:
                   1438:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1439:                return (&ip6->ip6_nxt);
1.2       itojun   1440:        else {
                   1441:                int len, nxt;
                   1442:                struct ip6_ext *ip6e = NULL;
                   1443:
                   1444:                nxt = ip6->ip6_nxt;
                   1445:                len = sizeof(struct ip6_hdr);
                   1446:                while (len < off) {
1.97      christos 1447:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1448:
1.35      itojun   1449:                        switch (nxt) {
1.2       itojun   1450:                        case IPPROTO_FRAGMENT:
                   1451:                                len += sizeof(struct ip6_frag);
                   1452:                                break;
                   1453:                        case IPPROTO_AH:
                   1454:                                len += (ip6e->ip6e_len + 2) << 2;
                   1455:                                break;
                   1456:                        default:
                   1457:                                len += (ip6e->ip6e_len + 1) << 3;
                   1458:                                break;
                   1459:                        }
                   1460:                        nxt = ip6e->ip6e_nxt;
                   1461:                }
                   1462:                if (ip6e)
1.58      itojun   1463:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1464:                else
                   1465:                        return NULL;
1.18      itojun   1466:        }
                   1467: }
                   1468:
                   1469: /*
                   1470:  * get next header offset.  m will be retained.
                   1471:  */
                   1472: int
1.107     christos 1473: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1474: {
                   1475:        struct ip6_hdr ip6;
                   1476:        struct ip6_ext ip6e;
                   1477:        struct ip6_frag fh;
                   1478:
                   1479:        /* just in case */
                   1480:        if (m == NULL)
                   1481:                panic("ip6_nexthdr: m == NULL");
                   1482:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1483:                return -1;
                   1484:
                   1485:        switch (proto) {
                   1486:        case IPPROTO_IPV6:
1.83      rpaulo   1487:                /* do not chase beyond intermediate IPv6 headers */
                   1488:                if (off != 0)
                   1489:                        return -1;
1.18      itojun   1490:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1491:                        return -1;
1.97      christos 1492:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1493:                if (nxtp)
                   1494:                        *nxtp = ip6.ip6_nxt;
                   1495:                off += sizeof(ip6);
                   1496:                return off;
                   1497:
                   1498:        case IPPROTO_FRAGMENT:
                   1499:                /*
                   1500:                 * terminate parsing if it is not the first fragment,
                   1501:                 * it does not make sense to parse through it.
                   1502:                 */
                   1503:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1504:                        return -1;
1.97      christos 1505:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1506:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1507:                        return -1;
                   1508:                if (nxtp)
                   1509:                        *nxtp = fh.ip6f_nxt;
                   1510:                off += sizeof(struct ip6_frag);
                   1511:                return off;
                   1512:
                   1513:        case IPPROTO_AH:
                   1514:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1515:                        return -1;
1.97      christos 1516:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1517:                if (nxtp)
                   1518:                        *nxtp = ip6e.ip6e_nxt;
                   1519:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1520:                if (m->m_pkthdr.len < off)
                   1521:                        return -1;
1.18      itojun   1522:                return off;
                   1523:
                   1524:        case IPPROTO_HOPOPTS:
                   1525:        case IPPROTO_ROUTING:
                   1526:        case IPPROTO_DSTOPTS:
                   1527:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1528:                        return -1;
1.97      christos 1529:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1530:                if (nxtp)
                   1531:                        *nxtp = ip6e.ip6e_nxt;
                   1532:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1533:                if (m->m_pkthdr.len < off)
                   1534:                        return -1;
1.18      itojun   1535:                return off;
                   1536:
                   1537:        case IPPROTO_NONE:
                   1538:        case IPPROTO_ESP:
                   1539:        case IPPROTO_IPCOMP:
                   1540:                /* give up */
                   1541:                return -1;
                   1542:
                   1543:        default:
                   1544:                return -1;
                   1545:        }
                   1546: }
                   1547:
                   1548: /*
                   1549:  * get offset for the last header in the chain.  m will be kept untainted.
                   1550:  */
                   1551: int
1.107     christos 1552: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1553: {
                   1554:        int newoff;
                   1555:        int nxt;
                   1556:
                   1557:        if (!nxtp) {
                   1558:                nxt = -1;
                   1559:                nxtp = &nxt;
                   1560:        }
1.86      rpaulo   1561:        for (;;) {
1.18      itojun   1562:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1563:                if (newoff < 0)
                   1564:                        return off;
                   1565:                else if (newoff < off)
                   1566:                        return -1;      /* invalid */
                   1567:                else if (newoff == off)
                   1568:                        return newoff;
                   1569:
                   1570:                off = newoff;
                   1571:                proto = *nxtp;
1.2       itojun   1572:        }
                   1573: }
                   1574:
1.81      rpaulo   1575: struct m_tag *
1.107     christos 1576: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1577: {
                   1578:        struct m_tag *mtag;
                   1579:
                   1580:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1581:        if (!mtag) {
                   1582:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1583:                    M_NOWAIT);
                   1584:                if (mtag) {
                   1585:                        m_tag_prepend(m, mtag);
1.124     cegger   1586:                        memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81      rpaulo   1587:                }
                   1588:        }
                   1589:        return mtag;
                   1590: }
                   1591:
                   1592: struct m_tag *
1.107     christos 1593: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1594: {
                   1595:        struct m_tag *mtag;
                   1596:
                   1597:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1598:        return mtag;
                   1599: }
                   1600:
                   1601: void
1.107     christos 1602: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1603: {
                   1604:        struct m_tag *mtag;
                   1605:
                   1606:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1607:        if (mtag)
                   1608:                m_tag_delete(m, mtag);
                   1609: }
                   1610:
1.98      liamjfoy 1611: #ifdef GATEWAY
                   1612: /*
                   1613:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1614:  * we could reduce this value, call ip6flow_reap();
                   1615:  */
                   1616: static int
1.101     liamjfoy 1617: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98      liamjfoy 1618: {
1.121     simonb   1619:        int error;
1.98      liamjfoy 1620:
1.121     simonb   1621:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1622:        if (error || newp == NULL)
                   1623:                return (error);
1.98      liamjfoy 1624:
1.121     simonb   1625:        mutex_enter(softnet_lock);
1.122     matt     1626:        KERNEL_LOCK(1, NULL);
1.120     matt     1627:
1.121     simonb   1628:        ip6flow_reap(0);
1.120     matt     1629:
                   1630:        KERNEL_UNLOCK_ONE(NULL);
1.121     simonb   1631:        mutex_exit(softnet_lock);
1.98      liamjfoy 1632:
1.121     simonb   1633:        return (0);
1.98      liamjfoy 1634: }
1.99      liamjfoy 1635:
                   1636: static int
                   1637: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1638: {
                   1639:        int error, tmp;
                   1640:        struct sysctlnode node;
                   1641:
                   1642:        node = *rnode;
                   1643:        tmp = ip6_hashsize;
                   1644:        node.sysctl_data = &tmp;
                   1645:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1646:        if (error || newp == NULL)
                   1647:                return (error);
                   1648:
                   1649:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1650:                /*
                   1651:                 * Can only fail due to malloc()
                   1652:                 */
1.120     matt     1653:                mutex_enter(softnet_lock);
1.122     matt     1654:                KERNEL_LOCK(1, NULL);
1.120     matt     1655:
                   1656:                error = ip6flow_invalidate_all(tmp);
                   1657:
                   1658:                KERNEL_UNLOCK_ONE(NULL);
                   1659:                mutex_exit(softnet_lock);
1.99      liamjfoy 1660:        } else {
                   1661:                /*
                   1662:                 * EINVAL if not a power of 2
1.121     simonb   1663:                 */
1.120     matt     1664:                error = EINVAL;
1.99      liamjfoy 1665:        }
                   1666:
1.120     matt     1667:        return error;
1.99      liamjfoy 1668: }
1.98      liamjfoy 1669: #endif /* GATEWAY */
                   1670:
1.2       itojun   1671: /*
                   1672:  * System control for IP6
                   1673:  */
                   1674:
1.120     matt     1675: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2       itojun   1676:        0,              0,              0,              0,
                   1677:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1678:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1679:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1680:        0,              0,              0,              0,
                   1681:        ENOPROTOOPT
                   1682: };
                   1683:
1.116     thorpej  1684: static int
                   1685: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
                   1686: {
                   1687:
1.119     thorpej  1688:        return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116     thorpej  1689: }
                   1690:
1.128     pooka    1691: static void
                   1692: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2       itojun   1693: {
1.85      rpaulo   1694: #ifdef RFC2292
                   1695: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1696: #else
                   1697: #define IS2292(x, y)   (y)
                   1698: #endif
1.26      itojun   1699:
1.73      atatat   1700:        sysctl_createv(clog, 0, NULL, NULL,
                   1701:                       CTLFLAG_PERMANENT,
1.70      atatat   1702:                       CTLTYPE_NODE, "net", NULL,
                   1703:                       NULL, 0, NULL, 0,
                   1704:                       CTL_NET, CTL_EOL);
1.73      atatat   1705:        sysctl_createv(clog, 0, NULL, NULL,
                   1706:                       CTLFLAG_PERMANENT,
1.74      atatat   1707:                       CTLTYPE_NODE, "inet6",
                   1708:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1709:                       NULL, 0, NULL, 0,
                   1710:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1711:        sysctl_createv(clog, 0, NULL, NULL,
                   1712:                       CTLFLAG_PERMANENT,
1.74      atatat   1713:                       CTLTYPE_NODE, "ip6",
                   1714:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1715:                       NULL, 0, NULL, 0,
                   1716:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1717:
1.73      atatat   1718:        sysctl_createv(clog, 0, NULL, NULL,
                   1719:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1720:                       CTLTYPE_INT, "forwarding",
                   1721:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1722:                       NULL, 0, &ip6_forwarding, 0,
                   1723:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1724:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1725:        sysctl_createv(clog, 0, NULL, NULL,
                   1726:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1727:                       CTLTYPE_INT, "redirect",
                   1728:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1729:                       NULL, 0, &ip6_sendredirects, 0,
                   1730:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1731:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1732:        sysctl_createv(clog, 0, NULL, NULL,
                   1733:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1734:                       CTLTYPE_INT, "hlim",
                   1735:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1736:                       NULL, 0, &ip6_defhlim, 0,
                   1737:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1738:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1739: #ifdef notyet
1.73      atatat   1740:        sysctl_createv(clog, 0, NULL, NULL,
                   1741:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1742:                       CTLTYPE_INT, "mtu", NULL,
                   1743:                       NULL, 0, &, 0,
                   1744:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1745:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1746: #endif
                   1747: #ifdef __no_idea__
1.73      atatat   1748:        sysctl_createv(clog, 0, NULL, NULL,
                   1749:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1750:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1751:                       NULL, 0, &?, 0,
                   1752:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1753:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1754:        sysctl_createv(clog, 0, NULL, NULL,
                   1755:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1756:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1757:                       NULL, 0, &?, sizeof(?),
                   1758:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1759:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1760:        sysctl_createv(clog, 0, NULL, NULL,
                   1761:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1762:                       CTLTYPE_?, "mrtproto", NULL,
                   1763:                       NULL, 0, &?, sizeof(?),
                   1764:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1765:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1766: #endif
1.73      atatat   1767:        sysctl_createv(clog, 0, NULL, NULL,
                   1768:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1769:                       CTLTYPE_INT, "maxfragpackets",
                   1770:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1771:                                    "for reassembly"),
1.70      atatat   1772:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1773:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1774:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1775: #ifdef __no_idea__
1.73      atatat   1776:        sysctl_createv(clog, 0, NULL, NULL,
                   1777:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1778:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1779:                       NULL, 0, &?, 0,
                   1780:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1781:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1782:        sysctl_createv(clog, 0, NULL, NULL,
                   1783:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1784:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1785:                       NULL, 0, &?, 0,
                   1786:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1787:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1788: #endif
1.73      atatat   1789:        sysctl_createv(clog, 0, NULL, NULL,
                   1790:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1791:                       CTLTYPE_INT, "accept_rtadv",
                   1792:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1793:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1794:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1795:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1796:        sysctl_createv(clog, 0, NULL, NULL,
                   1797:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.131     spz      1798:                       CTLTYPE_INT, "rtadv_maxroutes",
                   1799:                       SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"),
                   1800:                       NULL, 0, &ip6_rtadv_maxroutes, 0,
                   1801:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1802:                       IPV6CTL_RTADV_MAXROUTES, CTL_EOL);
                   1803:        sysctl_createv(clog, 0, NULL, NULL,
                   1804:                       CTLFLAG_PERMANENT,
                   1805:                       CTLTYPE_INT, "rtadv_numroutes",
                   1806:                       SYSCTL_DESCR("Current number of routes accepted via router advertisements"),
                   1807:                       NULL, 0, &nd6_numroutes, 0,
                   1808:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1809:                       IPV6CTL_RTADV_NUMROUTES, CTL_EOL);
                   1810:        sysctl_createv(clog, 0, NULL, NULL,
                   1811:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1812:                       CTLTYPE_INT, "keepfaith",
                   1813:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1814:                       NULL, 0, &ip6_keepfaith, 0,
                   1815:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1816:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1817:        sysctl_createv(clog, 0, NULL, NULL,
                   1818:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1819:                       CTLTYPE_INT, "log_interval",
                   1820:                       SYSCTL_DESCR("Minumum interval between logging "
                   1821:                                    "unroutable packets"),
1.70      atatat   1822:                       NULL, 0, &ip6_log_interval, 0,
                   1823:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1824:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1825:        sysctl_createv(clog, 0, NULL, NULL,
                   1826:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1827:                       CTLTYPE_INT, "hdrnestlimit",
                   1828:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1829:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1830:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1831:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1832:        sysctl_createv(clog, 0, NULL, NULL,
                   1833:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1834:                       CTLTYPE_INT, "dad_count",
                   1835:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1836:                                    "probes to send"),
1.70      atatat   1837:                       NULL, 0, &ip6_dad_count, 0,
                   1838:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1839:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1840:        sysctl_createv(clog, 0, NULL, NULL,
                   1841:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1842:                       CTLTYPE_INT, "auto_flowlabel",
                   1843:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1844:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1845:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1846:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1847:        sysctl_createv(clog, 0, NULL, NULL,
                   1848:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1849:                       CTLTYPE_INT, "defmcasthlim",
                   1850:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1851:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1852:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1853:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1854: #if NGIF > 0
1.73      atatat   1855:        sysctl_createv(clog, 0, NULL, NULL,
                   1856:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1857:                       CTLTYPE_INT, "gifhlim",
                   1858:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1859:                       NULL, 0, &ip6_gif_hlim, 0,
                   1860:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1861:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1862: #endif /* NGIF */
1.73      atatat   1863:        sysctl_createv(clog, 0, NULL, NULL,
                   1864:                       CTLFLAG_PERMANENT,
1.74      atatat   1865:                       CTLTYPE_STRING, "kame_version",
                   1866:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1867:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1868:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1869:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1870:        sysctl_createv(clog, 0, NULL, NULL,
                   1871:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1872:                       CTLTYPE_INT, "use_deprecated",
                   1873:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1874:                                    "source addresses"),
1.70      atatat   1875:                       NULL, 0, &ip6_use_deprecated, 0,
                   1876:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1877:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1878:        sysctl_createv(clog, 0, NULL, NULL,
                   1879:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1880:                       CTLTYPE_INT, "rr_prune", NULL,
                   1881:                       NULL, 0, &ip6_rr_prune, 0,
                   1882:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1883:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1884:        sysctl_createv(clog, 0, NULL, NULL,
                   1885:                       CTLFLAG_PERMANENT
1.70      atatat   1886: #ifndef INET6_BINDV6ONLY
1.73      atatat   1887:                       |CTLFLAG_READWRITE,
1.70      atatat   1888: #endif
1.74      atatat   1889:                       CTLTYPE_INT, "v6only",
                   1890:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1891:                                    "to PF_INET sockets"),
1.70      atatat   1892:                       NULL, 0, &ip6_v6only, 0,
                   1893:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1894:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1895:        sysctl_createv(clog, 0, NULL, NULL,
                   1896:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1897:                       CTLTYPE_INT, "anonportmin",
                   1898:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1899:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1900:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1901:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1902:        sysctl_createv(clog, 0, NULL, NULL,
                   1903:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1904:                       CTLTYPE_INT, "anonportmax",
                   1905:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1906:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1907:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1908:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1909: #ifndef IPNOPRIVPORTS
1.73      atatat   1910:        sysctl_createv(clog, 0, NULL, NULL,
                   1911:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1912:                       CTLTYPE_INT, "lowportmin",
                   1913:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1914:                                    "to assign"),
1.70      atatat   1915:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1916:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1917:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1918:        sysctl_createv(clog, 0, NULL, NULL,
                   1919:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1920:                       CTLTYPE_INT, "lowportmax",
                   1921:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1922:                                    "to assign"),
1.70      atatat   1923:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1924:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1925:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1926: #endif /* IPNOPRIVPORTS */
1.73      atatat   1927:        sysctl_createv(clog, 0, NULL, NULL,
                   1928:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1929:                       CTLTYPE_INT, "use_tempaddr",
                   1930:                       SYSCTL_DESCR("Use temporary address"),
                   1931:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1932:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1933:                       CTL_CREATE, CTL_EOL);
                   1934:        sysctl_createv(clog, 0, NULL, NULL,
                   1935:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1936:                       CTLTYPE_INT, "temppltime",
                   1937:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1938:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1939:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1940:                       CTL_CREATE, CTL_EOL);
                   1941:        sysctl_createv(clog, 0, NULL, NULL,
                   1942:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1943:                       CTLTYPE_INT, "tempvltime",
                   1944:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1945:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1946:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1947:                       CTL_CREATE, CTL_EOL);
                   1948:        sysctl_createv(clog, 0, NULL, NULL,
                   1949:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1950:                       CTLTYPE_INT, "maxfrags",
                   1951:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1952:                       NULL, 0, &ip6_maxfrags, 0,
                   1953:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1954:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1955:        sysctl_createv(clog, 0, NULL, NULL,
                   1956:                       CTLFLAG_PERMANENT,
                   1957:                       CTLTYPE_STRUCT, "stats",
                   1958:                       SYSCTL_DESCR("IPv6 statistics"),
1.116     thorpej  1959:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1960:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1961:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1962:        sysctl_createv(clog, 0, NULL, NULL,
                   1963:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1964:                       CTLTYPE_INT, "use_defaultzone",
                   1965:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1966:                       NULL, 0, &ip6_use_defzone, 0,
                   1967:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1968:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1969:        sysctl_createv(clog, 0, NULL, NULL,
                   1970:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1971:                       CTLTYPE_INT, "mcast_pmtu",
                   1972:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1973:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1974:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1975:                       CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1976: #ifdef GATEWAY
                   1977:        sysctl_createv(clog, 0, NULL, NULL,
                   1978:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1979:                        CTLTYPE_INT, "maxflows",
                   1980:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1981:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1982:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1983:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1984:        sysctl_createv(clog, 0, NULL, NULL,
                   1985:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1986:                        CTLTYPE_INT, "hashsize",
                   1987:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1988:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1989:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1990:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1991: #endif
1.2       itojun   1992: }
1.116     thorpej  1993:
                   1994: void
                   1995: ip6_statinc(u_int stat)
                   1996: {
                   1997:
                   1998:        KASSERT(stat < IP6_NSTATS);
                   1999:        IP6_STATINC(stat);
                   2000: }

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