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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.140.2.3

1.140.2.2  tls         1: /*     $NetBSD$        */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
1.65      agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.140.2.2  tls        65: __KERNEL_RCSID(0, "$NetBSD$");
1.2       itojun     66:
1.129     joerg      67: #include "opt_gateway.h"
1.2       itojun     68: #include "opt_inet.h"
1.85      rpaulo     69: #include "opt_inet6.h"
1.4       thorpej    70: #include "opt_ipsec.h"
1.123     christos   71: #include "opt_compat_netbsd.h"
1.2       itojun     72:
                     73: #include <sys/param.h>
                     74: #include <sys/systm.h>
                     75: #include <sys/malloc.h>
                     76: #include <sys/mbuf.h>
                     77: #include <sys/domain.h>
                     78: #include <sys/protosw.h>
                     79: #include <sys/socket.h>
                     80: #include <sys/socketvar.h>
                     81: #include <sys/errno.h>
                     82: #include <sys/time.h>
                     83: #include <sys/kernel.h>
                     84: #include <sys/syslog.h>
                     85: #include <sys/proc.h>
1.46      simonb     86: #include <sys/sysctl.h>
1.133     tls        87: #include <sys/cprng.h>
1.2       itojun     88:
                     89: #include <net/if.h>
                     90: #include <net/if_types.h>
                     91: #include <net/if_dl.h>
                     92: #include <net/route.h>
1.140.2.3! tls        93: #include <net/pktqueue.h>
1.15      darrenr    94: #include <net/pfil.h>
1.2       itojun     95:
                     96: #include <netinet/in.h>
1.9       itojun     97: #include <netinet/in_systm.h>
                     98: #ifdef INET
                     99: #include <netinet/ip.h>
1.140.2.3! tls       100: #include <netinet/ip_var.h>
1.9       itojun    101: #include <netinet/ip_icmp.h>
1.45      itojun    102: #endif /* INET */
1.14      itojun    103: #include <netinet/ip6.h>
1.140     christos  104: #include <netinet/portalgo.h>
1.2       itojun    105: #include <netinet6/in6_var.h>
1.11      itojun    106: #include <netinet6/ip6_var.h>
1.116     thorpej   107: #include <netinet6/ip6_private.h>
1.2       itojun    108: #include <netinet6/in6_pcb.h>
1.14      itojun    109: #include <netinet/icmp6.h>
1.81      rpaulo    110: #include <netinet6/scope6_var.h>
1.2       itojun    111: #include <netinet6/in6_ifattach.h>
                    112: #include <netinet6/nd6.h>
                    113:
1.140.2.2  tls       114: #ifdef IPSEC
1.94      degroote  115: #include <netipsec/ipsec.h>
                    116: #include <netipsec/ipsec6.h>
                    117: #include <netipsec/key.h>
1.140.2.2  tls       118: #endif /* IPSEC */
1.94      degroote  119:
1.123     christos  120: #ifdef COMPAT_50
                    121: #include <compat/sys/time.h>
                    122: #include <compat/sys/socket.h>
                    123: #endif
                    124:
1.2       itojun    125: #include <netinet6/ip6protosw.h>
                    126:
                    127: #include "faith.h"
                    128: #include "gif.h"
1.50      itojun    129:
                    130: #if NGIF > 0
                    131: #include <netinet6/in6_gif.h>
                    132: #endif
1.2       itojun    133:
1.9       itojun    134: #include <net/net_osdep.h>
                    135:
1.2       itojun    136: extern struct domain inet6domain;
                    137:
                    138: u_char ip6_protox[IPPROTO_MAX];
                    139: struct in6_ifaddr *in6_ifaddr;
1.140.2.3! tls       140: pktqueue_t *ip6_pktq __read_mostly;
1.2       itojun    141:
1.108     ad        142: extern callout_t in6_tmpaddrtimer_ch;
1.83      rpaulo    143:
1.2       itojun    144: int ip6_forward_srcrt;                 /* XXX */
                    145: int ip6_sourcecheck;                   /* XXX */
                    146: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    147:
1.140.2.3! tls       148: pfil_head_t *inet6_pfil_hook;
1.29      thorpej   149:
1.116     thorpej   150: percpu_t *ip6stat_percpu;
1.2       itojun    151:
1.111     dyoung    152: static void ip6_init2(void *);
1.140.2.3! tls       153: static void ip6intr(void *);
1.112     dyoung    154: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    155:
1.136     drochner  156: static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
                    157:        u_int32_t *);
1.111     dyoung    158: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128     pooka     159: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2       itojun    160:
                    161: /*
                    162:  * IP6 initialization: fill in IP6 protocol switch table.
                    163:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    164:  */
                    165: void
1.114     matt      166: ip6_init(void)
1.2       itojun    167: {
1.78      christos  168:        const struct ip6protosw *pr;
1.35      itojun    169:        int i;
1.2       itojun    170:
1.128     pooka     171:        sysctl_net_inet6_ip6_setup(NULL);
1.78      christos  172:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    173:        if (pr == 0)
                    174:                panic("ip6_init");
                    175:        for (i = 0; i < IPPROTO_MAX; i++)
                    176:                ip6_protox[i] = pr - inet6sw;
1.78      christos  177:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    178:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    179:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    180:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    181:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
1.140.2.3! tls       182:
        !           183:        ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL);
        !           184:        KASSERT(ip6_pktq != NULL);
        !           185:
1.81      rpaulo    186:        scope6_init();
                    187:        addrsel_policy_init();
1.2       itojun    188:        nd6_init();
                    189:        frag6_init();
1.133     tls       190:        ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    191:
1.135     christos  192:        ip6_init2(NULL);
1.98      liamjfoy  193: #ifdef GATEWAY
1.99      liamjfoy  194:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  195: #endif
1.29      thorpej   196:        /* Register our Packet Filter hook. */
1.140.2.3! tls       197:        inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6);
        !           198:        KASSERT(inet6_pfil_hook != NULL);
1.116     thorpej   199:
                    200:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2       itojun    201: }
                    202:
                    203: static void
1.90      christos  204: ip6_init2(void *dummy)
1.2       itojun    205: {
                    206:
                    207:        /* nd6_timer_init */
1.118     ad        208:        callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19      thorpej   209:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    210:
                    211:        /* timer for regeneranation of temporary addresses randomize ID */
1.118     ad        212:        callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83      rpaulo    213:        callout_reset(&in6_tmpaddrtimer_ch,
                    214:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    215:                       ip6_temp_regen_advance) * hz,
                    216:                      in6_tmpaddrtimer, NULL);
1.2       itojun    217: }
                    218:
                    219: /*
                    220:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    221:  */
1.140.2.3! tls       222: static void
        !           223: ip6intr(void *arg __unused)
1.2       itojun    224: {
                    225:        struct mbuf *m;
                    226:
1.118     ad        227:        mutex_enter(softnet_lock);
1.140.2.3! tls       228:        while ((m = pktq_dequeue(ip6_pktq)) != NULL) {
        !           229:                const ifnet_t *ifp = m->m_pkthdr.rcvif;
        !           230:
        !           231:                /*
        !           232:                 * Drop the packet if IPv6 is disabled on the interface.
        !           233:                 */
        !           234:                if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
1.83      rpaulo    235:                        m_freem(m);
1.140.2.3! tls       236:                        continue;
1.83      rpaulo    237:                }
1.2       itojun    238:                ip6_input(m);
                    239:        }
1.118     ad        240:        mutex_exit(softnet_lock);
1.2       itojun    241: }
                    242:
1.103     dyoung    243: extern struct  route ip6_forward_rt;
1.2       itojun    244:
                    245: void
1.96      dyoung    246: ip6_input(struct mbuf *m)
1.2       itojun    247: {
1.9       itojun    248:        struct ip6_hdr *ip6;
1.105     dyoung    249:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    250:        u_int32_t plen;
1.5       itojun    251:        u_int32_t rtalert = ~0;
1.104     yamt      252:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    253:        struct ifnet *deliverifp = NULL;
1.64      itojun    254:        int srcrt = 0;
1.105     dyoung    255:        const struct rtentry *rt;
                    256:        union {
                    257:                struct sockaddr         dst;
                    258:                struct sockaddr_in6     dst6;
                    259:        } u;
1.2       itojun    260:
                    261:        /*
1.81      rpaulo    262:         * make sure we don't have onion peering information into m_tag.
                    263:         */
                    264:        ip6_delaux(m);
                    265:
                    266:        /*
1.44      itojun    267:         * mbuf statistics
1.2       itojun    268:         */
                    269:        if (m->m_flags & M_EXT) {
                    270:                if (m->m_next)
1.116     thorpej   271:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    272:                else
1.116     thorpej   273:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    274:        } else {
1.115     thorpej   275: #define M2MMAX 32
1.2       itojun    276:                if (m->m_next) {
1.9       itojun    277:                        if (m->m_flags & M_LOOP) {
1.116     thorpej   278:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115     thorpej   279:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116     thorpej   280:                                IP6_STATINC(IP6_STAT_M2M +
                    281:                                            m->m_pkthdr.rcvif->if_index);
1.115     thorpej   282:                        } else
1.116     thorpej   283:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    284:                } else
1.116     thorpej   285:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    286: #undef M2MMAX
1.2       itojun    287:        }
                    288:
1.9       itojun    289:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116     thorpej   290:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    291:
1.57      thorpej   292:        /*
                    293:         * If the IPv6 header is not aligned, slurp it up into a new
                    294:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    295:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   296:         * IPv6 header is in the first mbuf of the chain.
                    297:         */
1.97      christos  298:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   299:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    300:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    301:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    302:                        /* XXXJRT new stat, please */
1.116     thorpej   303:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.57      thorpej   304:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    305:                        return;
                    306:                }
                    307:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    308:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    309:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116     thorpej   310:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.9       itojun    311:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    312:                        return;
                    313:                }
1.2       itojun    314:        }
                    315:
                    316:        ip6 = mtod(m, struct ip6_hdr *);
                    317:
                    318:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116     thorpej   319:                IP6_STATINC(IP6_STAT_BADVERS);
1.9       itojun    320:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    321:                goto bad;
                    322:        }
1.15      darrenr   323:
1.98      liamjfoy  324:        /*
                    325:         * Assume that we can create a fast-forward IP flow entry
                    326:         * based on this packet.
                    327:         */
                    328:        m->m_flags |= M_CANFASTFWD;
                    329:
1.15      darrenr   330:        /*
                    331:         * Run through list of hooks for input packets.  If there are any
                    332:         * filters which require that additional packets in the flow are
                    333:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    334:         * Note that filters must _never_ set this flag, as another filter
                    335:         * in the list may have previously cleared it.
                    336:         */
1.39      itojun    337:        /*
                    338:         * let ipfilter look at packet on the wire,
                    339:         * not the decapsulated packet.
                    340:         */
1.140.2.2  tls       341: #if defined(IPSEC)
1.140.2.3! tls       342:        if (!ipsec_used || !ipsec_indone(m))
1.39      itojun    343: #else
                    344:        if (1)
                    345: #endif
                    346:        {
1.64      itojun    347:                struct in6_addr odst;
                    348:
                    349:                odst = ip6->ip6_dst;
1.140.2.3! tls       350:                if (pfil_run_hooks(inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
1.39      itojun    351:                                   PFIL_IN) != 0)
                    352:                        return;
                    353:                if (m == NULL)
                    354:                        return;
                    355:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    356:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    357:        }
1.15      darrenr   358:
1.116     thorpej   359:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    360:
1.30      thorpej   361: #ifdef ALTQ
                    362:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    363:                /* packet is dropped by traffic conditioner */
                    364:                return;
1.9       itojun    365:        }
                    366: #endif
                    367:
1.2       itojun    368:        /*
1.44      itojun    369:         * Check against address spoofing/corruption.
1.2       itojun    370:         */
                    371:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    372:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    373:                /*
                    374:                 * XXX: "badscope" is not very suitable for a multicast source.
                    375:                 */
1.116     thorpej   376:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.9       itojun    377:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    378:                goto bad;
                    379:        }
1.13      itojun    380:        /*
1.44      itojun    381:         * The following check is not documented in specs.  A malicious
                    382:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    383:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    384:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    385:         *
1.44      itojun    386:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    387:         * support IPv4-less kernel compilation, we cannot support SIIT
                    388:         * environment at all.  So, it makes more sense for us to reject any
                    389:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       390:         * partial support for SIIT environment.
1.13      itojun    391:         */
                    392:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    393:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   394:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    395:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    396:                goto bad;
                    397:        }
1.17      itojun    398: #if 0
1.13      itojun    399:        /*
1.17      itojun    400:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    401:         *
                    402:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    403:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    404:         * is revised to forbid relaying case.
1.13      itojun    405:         */
                    406:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    407:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116     thorpej   408:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    409:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    410:                goto bad;
                    411:        }
                    412: #endif
1.35      itojun    413:
1.2       itojun    414:        /*
1.82      yamt      415:         * Disambiguate address scope zones (if there is ambiguity).
                    416:         * We first make sure that the original source or destination address
                    417:         * is not in our internal form for scoped addresses.  Such addresses
                    418:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    419:         * to the usage conflict.
                    420:         * in6_setscope() then also checks and rejects the cases where src or
                    421:         * dst are the loopback address and the receiving interface
                    422:         * is not loopback.
                    423:         */
1.88      bouyer    424:        if (__predict_false(
                    425:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    426:                goto bad;
                    427:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      428:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116     thorpej   429:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      430:                goto bad;
                    431:        }
                    432:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    433:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116     thorpej   434:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      435:                goto bad;
                    436:        }
                    437:
                    438:        /*
1.2       itojun    439:         * Multicast check
                    440:         */
                    441:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    442:                struct  in6_multi *in6m = 0;
1.9       itojun    443:
                    444:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    445:                /*
                    446:                 * See if we belong to the destination multicast group on the
                    447:                 * arrival interface.
                    448:                 */
                    449:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    450:                if (in6m)
                    451:                        ours = 1;
                    452:                else if (!ip6_mrouter) {
1.116     thorpej   453:                        uint64_t *ip6s = IP6_STAT_GETREF();
                    454:                        ip6s[IP6_STAT_NOTMEMBER]++;
                    455:                        ip6s[IP6_STAT_CANTFORWARD]++;
                    456:                        IP6_STAT_PUTREF();
1.9       itojun    457:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    458:                        goto bad;
                    459:                }
1.9       itojun    460:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    461:                goto hbhcheck;
                    462:        }
                    463:
1.105     dyoung    464:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    465:
1.2       itojun    466:        /*
                    467:         *  Unicast check
                    468:         */
1.105     dyoung    469:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
                    470:        if (hit)
1.116     thorpej   471:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     472:        else
1.116     thorpej   473:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    474:
1.109     dyoung    475: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2       itojun    476:
                    477:        /*
                    478:         * Accept the packet if the forwarding interface to the destination
                    479:         * according to the routing table is the loopback interface,
                    480:         * unless the associated route has a gateway.
                    481:         * Note that this approach causes to accept a packet if there is a
                    482:         * route to the loopback interface for the destination of the packet.
                    483:         * But we think it's even useful in some situations, e.g. when using
                    484:         * a special daemon which wants to intercept the packet.
                    485:         */
1.105     dyoung    486:        if (rt != NULL &&
                    487:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    488:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    489: #if 0
                    490:            /*
                    491:             * The check below is redundant since the comparison of
                    492:             * the destination and the key of the rtentry has
                    493:             * already done through looking up the routing table.
                    494:             */
1.109     dyoung    495:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2       itojun    496: #endif
1.105     dyoung    497:            rt->rt_ifp->if_type == IFT_LOOP) {
                    498:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    499:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    500:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    501:                /*
                    502:                 * packets to a tentative, duplicated, or somehow invalid
                    503:                 * address must not be accepted.
                    504:                 */
1.2       itojun    505:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    506:                        /* this address is ready */
1.2       itojun    507:                        ours = 1;
1.9       itojun    508:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    509:                        goto hbhcheck;
                    510:                } else {
1.24      itojun    511:                        /* address is not ready, so discard the packet. */
1.34      itojun    512:                        nd6log((LOG_INFO,
1.27      itojun    513:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    514:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    515:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    516:
                    517:                        goto bad;
1.2       itojun    518:                }
                    519:        }
                    520:
                    521:        /*
1.55      itojun    522:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    523:         */
                    524: #if defined(NFAITH) && 0 < NFAITH
                    525:        if (ip6_keepfaith) {
1.105     dyoung    526:                if (rt != NULL && rt->rt_ifp != NULL &&
                    527:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    528:                        /* XXX do we need more sanity checks? */
                    529:                        ours = 1;
1.105     dyoung    530:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    531:                        goto hbhcheck;
                    532:                }
                    533:        }
                    534: #endif
                    535:
                    536: #if 0
                    537:     {
                    538:        /*
                    539:         * Last resort: check in6_ifaddr for incoming interface.
                    540:         * The code is here until I update the "goto ours hack" code above
                    541:         * working right.
                    542:         */
                    543:        struct ifaddr *ifa;
1.113     dyoung    544:        IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9       itojun    545:                if (ifa->ifa_addr == NULL)
                    546:                        continue;       /* just for safety */
                    547:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    548:                        continue;
                    549:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    550:                        ours = 1;
                    551:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    552:                        goto hbhcheck;
                    553:                }
                    554:        }
1.9       itojun    555:     }
1.2       itojun    556: #endif
                    557:
                    558:        /*
                    559:         * Now there is no reason to process the packet if it's not our own
                    560:         * and we're not a router.
                    561:         */
                    562:        if (!ip6_forwarding) {
1.116     thorpej   563:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9       itojun    564:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    565:                goto bad;
                    566:        }
                    567:
                    568:   hbhcheck:
                    569:        /*
1.81      rpaulo    570:         * record address information into m_tag, if we don't have one yet.
                    571:         * note that we are unable to record it, if the address is not listed
                    572:         * as our interface address (e.g. multicast addresses, addresses
                    573:         * within FAITH prefixes and such).
                    574:         */
1.111     dyoung    575:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    576:                struct in6_ifaddr *ia6;
                    577:
                    578:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111     dyoung    579:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    580:                        /*
                    581:                         * XXX maybe we should drop the packet here,
                    582:                         * as we could not provide enough information
                    583:                         * to the upper layers.
                    584:                         */
1.81      rpaulo    585:                }
                    586:        }
                    587:
                    588:        /*
1.2       itojun    589:         * Process Hop-by-Hop options header if it's contained.
                    590:         * m may be modified in ip6_hopopts_input().
                    591:         * If a JumboPayload option is included, plen will also be modified.
                    592:         */
                    593:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    594:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    595:                struct ip6_hbh *hbh;
                    596:
                    597:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    598: #if 0  /*touches NULL pointer*/
                    599:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    600: #endif
1.2       itojun    601:                        return; /* m have already been freed */
1.9       itojun    602:                }
1.22      itojun    603:
1.2       itojun    604:                /* adjust pointer */
                    605:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    606:
                    607:                /*
1.49      itojun    608:                 * if the payload length field is 0 and the next header field
1.22      itojun    609:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    610:                 * option MUST be included.
                    611:                 */
                    612:                if (ip6->ip6_plen == 0 && plen == 0) {
                    613:                        /*
                    614:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    615:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    616:                         * (non-zero) payload length to the variable plen.
1.22      itojun    617:                         */
1.116     thorpej   618:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    619:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    620:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    621:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    622:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  623:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    624:                        return;
                    625:                }
1.9       itojun    626:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    627:                        sizeof(struct ip6_hbh));
                    628:                if (hbh == NULL) {
1.116     thorpej   629:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    630:                        return;
                    631:                }
1.57      thorpej   632:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    633:                nxt = hbh->ip6h_nxt;
1.2       itojun    634:
                    635:                /*
                    636:                 * accept the packet if a router alert option is included
                    637:                 * and we act as an IPv6 router.
                    638:                 */
1.5       itojun    639:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    640:                        ours = 1;
                    641:        } else
                    642:                nxt = ip6->ip6_nxt;
                    643:
                    644:        /*
                    645:         * Check that the amount of data in the buffers
                    646:         * is as at least much as the IPv6 header would have us expect.
                    647:         * Trim mbufs if longer than we expect.
                    648:         * Drop packet if shorter than we expect.
                    649:         */
                    650:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116     thorpej   651:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    652:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    653:                goto bad;
                    654:        }
                    655:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    656:                if (m->m_len == m->m_pkthdr.len) {
                    657:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    658:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    659:                } else
                    660:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    661:        }
                    662:
                    663:        /*
                    664:         * Forward if desirable.
                    665:         */
                    666:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    667:                /*
                    668:                 * If we are acting as a multicast router, all
                    669:                 * incoming multicast packets are passed to the
                    670:                 * kernel-level multicast forwarding function.
                    671:                 * The packet is returned (relatively) intact; if
                    672:                 * ip6_mforward() returns a non-zero value, the packet
                    673:                 * must be discarded, else it may be accepted below.
                    674:                 */
                    675:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116     thorpej   676:                        IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2       itojun    677:                        m_freem(m);
                    678:                        return;
                    679:                }
                    680:                if (!ours) {
                    681:                        m_freem(m);
                    682:                        return;
                    683:                }
1.22      itojun    684:        } else if (!ours) {
1.64      itojun    685:                ip6_forward(m, srcrt);
1.2       itojun    686:                return;
1.56      itojun    687:        }
1.25      itojun    688:
                    689:        ip6 = mtod(m, struct ip6_hdr *);
                    690:
                    691:        /*
                    692:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    693:         * tcp/udp stack and bypass security checks (act as if it was from
                    694:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    695:         *
                    696:         * For SIIT end node behavior, you may want to disable the check.
                    697:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    698:         * source.
                    699:         */
                    700:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    701:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   702:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.25      itojun    703:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    704:                goto bad;
                    705:        }
1.2       itojun    706:
                    707:        /*
                    708:         * Tell launch routine the next header
                    709:         */
1.12      itojun    710: #ifdef IFA_STATS
1.28      itojun    711:        if (deliverifp != NULL) {
1.9       itojun    712:                struct in6_ifaddr *ia6;
                    713:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    714:                if (ia6)
                    715:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    716:        }
                    717: #endif
1.116     thorpej   718:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    719:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    720:        nest = 0;
1.40      itojun    721:
1.104     yamt      722:        rh_present = 0;
1.2       itojun    723:        while (nxt != IPPROTO_DONE) {
                    724:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116     thorpej   725:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104     yamt      726:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    727:                        goto bad;
                    728:                }
1.8       itojun    729:
                    730:                /*
                    731:                 * protection against faulty packet - there should be
                    732:                 * more sanity checks in header chain processing.
                    733:                 */
                    734:                if (m->m_pkthdr.len < off) {
1.116     thorpej   735:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    736:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    737:                        goto bad;
                    738:                }
                    739:
1.104     yamt      740:                if (nxt == IPPROTO_ROUTING) {
                    741:                        if (rh_present++) {
                    742:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
                    743:                                    ifs6_in_hdrerr);
1.116     thorpej   744:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      745:                                goto bad;
                    746:                        }
                    747:                }
                    748:
1.140.2.2  tls       749: #ifdef IPSEC
1.140.2.3! tls       750:                if (ipsec_used) {
        !           751:                        struct m_tag *mtag;
        !           752:                        struct tdb_ident *tdbi;
        !           753:                        struct secpolicy *sp;
        !           754:                        int s, error;
        !           755:
1.94      degroote  756:                        /*
1.140.2.3! tls       757:                         * enforce IPsec policy checking if we are seeing last
        !           758:                         * header. note that we do not visit this with
        !           759:                         * protocols with pcb layer code - like udp/tcp/raw ip.
1.94      degroote  760:                         */
1.140.2.3! tls       761:                        if ((inet6sw[ip_protox[nxt]].pr_flags
        !           762:                            & PR_LASTHDR) != 0) {
        !           763:                                /*
        !           764:                                 * Check if the packet has already had IPsec
        !           765:                                 * processing done. If so, then just pass it
        !           766:                                 * along. This tag gets set during AH, ESP,
        !           767:                                 * etc. input handling, before the packet is
        !           768:                                 * returned to the ip input queue for delivery.
        !           769:                                 */
        !           770:                                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE,
        !           771:                                    NULL);
        !           772:                                s = splsoftnet();
        !           773:                                if (mtag != NULL) {
        !           774:                                        tdbi = (struct tdb_ident *)(mtag + 1);
        !           775:                                        sp = ipsec_getpolicy(tdbi,
        !           776:                                            IPSEC_DIR_INBOUND);
        !           777:                                } else {
        !           778:                                        sp = ipsec_getpolicybyaddr(m,
        !           779:                                            IPSEC_DIR_INBOUND, IP_FORWARDING,
        !           780:                                            &error);
        !           781:                                }
        !           782:                                if (sp != NULL) {
        !           783:                                        /*
        !           784:                                         * Check security policy against packet
        !           785:                                         * attributes.
        !           786:                                         */
        !           787:                                        error = ipsec_in_reject(sp, m);
        !           788:                                        KEY_FREESP(&sp);
        !           789:                                } else {
        !           790:                                        /* XXX error stat??? */
        !           791:                                        error = EINVAL;
        !           792:                                        DPRINTF(("ip6_input: no SP, packet"
        !           793:                                            " discarded\n"));/*XXX*/
        !           794:                                }
        !           795:                                splx(s);
        !           796:                                if (error)
        !           797:                                        goto bad;
        !           798:                        }
1.94      degroote  799:                }
1.140.2.2  tls       800: #endif /* IPSEC */
1.94      degroote  801:
1.2       itojun    802:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    803:        }
                    804:        return;
                    805:  bad:
                    806:        m_freem(m);
                    807: }
                    808:
                    809: /*
1.81      rpaulo    810:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    811:  */
                    812: static struct m_tag *
1.112     dyoung    813: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    814: {
                    815:        struct m_tag *mtag;
1.140.2.3! tls       816:        struct ip6aux *ip6a;
1.81      rpaulo    817:
                    818:        mtag = ip6_addaux(m);
1.140.2.3! tls       819:        if (mtag == NULL)
        !           820:                return NULL;
1.112     dyoung    821:
1.140.2.3! tls       822:        ip6a = (struct ip6aux *)(mtag + 1);
        !           823:        if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) {
        !           824:                IP6_STATINC(IP6_STAT_BADSCOPE);
        !           825:                return NULL;
1.112     dyoung    826:        }
1.140.2.3! tls       827:
        !           828:        ip6a->ip6a_src = ia->ia_addr.sin6_addr;
        !           829:        ip6a->ip6a_flags = ia->ia6_flags;
        !           830:        return mtag;
1.81      rpaulo    831: }
                    832:
1.112     dyoung    833: const struct ip6aux *
1.107     christos  834: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    835: {
                    836:        struct m_tag *mtag;
                    837:
                    838:        mtag = ip6_findaux(m);
1.112     dyoung    839:        if (mtag != NULL)
                    840:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    841:        else
                    842:                return NULL;
                    843: }
                    844:
                    845: /*
1.2       itojun    846:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    847:  * included, the real payload length will be stored in plenp.
1.107     christos  848:  *
                    849:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    850:  */
1.136     drochner  851: int
1.107     christos  852: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
                    853:        struct mbuf **mp, int *offp)
1.2       itojun    854: {
1.35      itojun    855:        struct mbuf *m = *mp;
1.2       itojun    856:        int off = *offp, hbhlen;
                    857:        struct ip6_hbh *hbh;
                    858:
                    859:        /* validation of the length of the header */
1.9       itojun    860:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    861:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    862:        if (hbh == NULL) {
1.116     thorpej   863:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    864:                return -1;
                    865:        }
                    866:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    867:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    868:                hbhlen);
                    869:        if (hbh == NULL) {
1.116     thorpej   870:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    871:                return -1;
                    872:        }
1.57      thorpej   873:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    874:        off += hbhlen;
                    875:        hbhlen -= sizeof(struct ip6_hbh);
                    876:
                    877:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    878:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    879:                return (-1);
1.2       itojun    880:
                    881:        *offp = off;
                    882:        *mp = m;
1.58      itojun    883:        return (0);
1.2       itojun    884: }
                    885:
                    886: /*
                    887:  * Search header for all Hop-by-hop options and process each option.
                    888:  * This function is separate from ip6_hopopts_input() in order to
                    889:  * handle a case where the sending node itself process its hop-by-hop
                    890:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    891:  *
                    892:  * The function assumes that hbh header is located right after the IPv6 header
                    893:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    894:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    895:  */
1.136     drochner  896: static int
1.107     christos  897: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
                    898:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    899: {
                    900:        struct ip6_hdr *ip6;
                    901:        int optlen = 0;
                    902:        u_int8_t *opt = opthead;
                    903:        u_int16_t rtalert_val;
1.22      itojun    904:        u_int32_t jumboplen;
1.55      itojun    905:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    906:
                    907:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    908:                switch (*opt) {
                    909:                case IP6OPT_PAD1:
                    910:                        optlen = 1;
                    911:                        break;
                    912:                case IP6OPT_PADN:
                    913:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   914:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    915:                                goto bad;
                    916:                        }
                    917:                        optlen = *(opt + 1) + 2;
                    918:                        break;
                    919:                case IP6OPT_RTALERT:
                    920:                        /* XXX may need check for alignment */
                    921:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116     thorpej   922:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    923:                                goto bad;
                    924:                        }
                    925:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    926:                                /* XXX stat */
                    927:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    928:                                    ICMP6_PARAMPROB_HEADER,
                    929:                                    erroff + opt + 1 - opthead);
                    930:                                return (-1);
1.35      itojun    931:                        }
                    932:                        optlen = IP6OPT_RTALERT_LEN;
1.126     tsutsui   933:                        memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35      itojun    934:                        *rtalertp = ntohs(rtalert_val);
                    935:                        break;
                    936:                case IP6OPT_JUMBO:
1.22      itojun    937:                        /* XXX may need check for alignment */
                    938:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116     thorpej   939:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    940:                                goto bad;
                    941:                        }
1.35      itojun    942:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    943:                                /* XXX stat */
                    944:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    945:                                    ICMP6_PARAMPROB_HEADER,
                    946:                                    erroff + opt + 1 - opthead);
                    947:                                return (-1);
1.35      itojun    948:                        }
1.22      itojun    949:                        optlen = IP6OPT_JUMBO_LEN;
                    950:
                    951:                        /*
                    952:                         * IPv6 packets that have non 0 payload length
1.35      itojun    953:                         * must not contain a jumbo payload option.
1.22      itojun    954:                         */
                    955:                        ip6 = mtod(m, struct ip6_hdr *);
                    956:                        if (ip6->ip6_plen) {
1.116     thorpej   957:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    958:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    959:                                    ICMP6_PARAMPROB_HEADER,
                    960:                                    erroff + opt - opthead);
                    961:                                return (-1);
1.22      itojun    962:                        }
1.2       itojun    963:
1.22      itojun    964:                        /*
                    965:                         * We may see jumbolen in unaligned location, so
                    966:                         * we'd need to perform bcopy().
                    967:                         */
1.126     tsutsui   968:                        memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22      itojun    969:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    970:
                    971: #if 1
                    972:                        /*
                    973:                         * if there are multiple jumbo payload options,
                    974:                         * *plenp will be non-zero and the packet will be
                    975:                         * rejected.
                    976:                         * the behavior may need some debate in ipngwg -
                    977:                         * multiple options does not make sense, however,
                    978:                         * there's no explicit mention in specification.
                    979:                         */
                    980:                        if (*plenp != 0) {
1.116     thorpej   981:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    982:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    983:                                    ICMP6_PARAMPROB_HEADER,
                    984:                                    erroff + opt + 2 - opthead);
                    985:                                return (-1);
1.22      itojun    986:                        }
1.8       itojun    987: #endif
1.2       itojun    988:
1.22      itojun    989:                        /*
                    990:                         * jumbo payload length must be larger than 65535.
                    991:                         */
                    992:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116     thorpej   993:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    994:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    995:                                    ICMP6_PARAMPROB_HEADER,
                    996:                                    erroff + opt + 2 - opthead);
                    997:                                return (-1);
1.22      itojun    998:                        }
                    999:                        *plenp = jumboplen;
                   1000:
                   1001:                        break;
1.35      itojun   1002:                default:                /* unknown option */
                   1003:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej  1004:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun   1005:                                goto bad;
                   1006:                        }
1.55      itojun   1007:                        optlen = ip6_unknown_opt(opt, m,
                   1008:                            erroff + opt - opthead);
                   1009:                        if (optlen == -1)
                   1010:                                return (-1);
1.35      itojun   1011:                        optlen += 2;
                   1012:                        break;
1.2       itojun   1013:                }
                   1014:        }
                   1015:
1.55      itojun   1016:        return (0);
1.2       itojun   1017:
                   1018:   bad:
                   1019:        m_freem(m);
1.55      itojun   1020:        return (-1);
1.2       itojun   1021: }
                   1022:
                   1023: /*
                   1024:  * Unknown option processing.
                   1025:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1026:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1027:  * is not continuous in order to return an ICMPv6 error.
                   1028:  */
                   1029: int
1.107     christos 1030: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun   1031: {
                   1032:        struct ip6_hdr *ip6;
                   1033:
1.35      itojun   1034:        switch (IP6OPT_TYPE(*optp)) {
                   1035:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1036:                return ((int)*(optp + 1));
1.35      itojun   1037:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1038:                m_freem(m);
1.58      itojun   1039:                return (-1);
1.35      itojun   1040:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116     thorpej  1041:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1042:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1043:                return (-1);
1.35      itojun   1044:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116     thorpej  1045:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1046:                ip6 = mtod(m, struct ip6_hdr *);
                   1047:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1048:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1049:                        m_freem(m);
                   1050:                else
                   1051:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1052:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1053:                return (-1);
1.2       itojun   1054:        }
                   1055:
                   1056:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1057:        return (-1);
1.2       itojun   1058: }
                   1059:
                   1060: /*
1.9       itojun   1061:  * Create the "control" list for this pcb.
                   1062:  *
                   1063:  * The routine will be called from upper layer handlers like tcp6_input().
                   1064:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1065:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1066:  * very first mbuf on the mbuf chain.
                   1067:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1068:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1069:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1070:  */
                   1071: void
1.107     christos 1072: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
                   1073:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1074: {
1.85      rpaulo   1075: #ifdef RFC2292
                   1076: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1077: #else
                   1078: #define IS2292(x, y)   (y)
                   1079: #endif
                   1080:
1.123     christos 1081:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP
                   1082: #ifdef SO_OTIMESTAMP
                   1083:            || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                   1084: #endif
                   1085:        ) {
1.2       itojun   1086:                struct timeval tv;
                   1087:
                   1088:                microtime(&tv);
1.123     christos 1089: #ifdef SO_OTIMESTAMP
                   1090:                if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
                   1091:                        struct timeval50 tv50;
                   1092:                        timeval_to_timeval50(&tv, &tv50);
                   1093:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1094:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1095:                } else
                   1096: #endif
1.97      christos 1097:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1098:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1099:                if (*mp)
                   1100:                        mp = &(*mp)->m_next;
                   1101:        }
1.87      rpaulo   1102:
                   1103:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1104:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1105:                return;
                   1106:
1.2       itojun   1107:        /* RFC 2292 sec. 5 */
1.35      itojun   1108:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1109:                struct in6_pktinfo pi6;
1.85      rpaulo   1110:
1.126     tsutsui  1111:                memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81      rpaulo   1112:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1113:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1114:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1115:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1116:                    sizeof(struct in6_pktinfo),
                   1117:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1118:                if (*mp)
                   1119:                        mp = &(*mp)->m_next;
                   1120:        }
1.85      rpaulo   1121:
1.2       itojun   1122:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1123:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1124:
1.97      christos 1125:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1126:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1127:                if (*mp)
                   1128:                        mp = &(*mp)->m_next;
                   1129:        }
                   1130:
                   1131:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1132:                u_int32_t flowinfo;
                   1133:                int tclass;
                   1134:
                   1135:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1136:                flowinfo >>= 20;
                   1137:
                   1138:                tclass = flowinfo & 0xff;
1.97      christos 1139:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1140:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1141:
1.2       itojun   1142:                if (*mp)
                   1143:                        mp = &(*mp)->m_next;
                   1144:        }
                   1145:
                   1146:        /*
1.75      itojun   1147:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1148:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1149:         * strict, since there might be some hop-by-hop options which can be
                   1150:         * returned to normal user.
1.85      rpaulo   1151:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1152:         */
1.75      itojun   1153:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1154:                /*
                   1155:                 * Check if a hop-by-hop options header is contatined in the
                   1156:                 * received packet, and if so, store the options as ancillary
                   1157:                 * data. Note that a hop-by-hop options header must be
                   1158:                 * just after the IPv6 header, which fact is assured through
                   1159:                 * the IPv6 input processing.
                   1160:                 */
1.78      christos 1161:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1162:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1163:                        struct ip6_hbh *hbh;
                   1164:                        int hbhlen;
1.62      itojun   1165:                        struct mbuf *ext;
1.9       itojun   1166:
1.62      itojun   1167:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1168:                            xip6->ip6_nxt);
1.62      itojun   1169:                        if (ext == NULL) {
1.116     thorpej  1170:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1171:                                return;
                   1172:                        }
1.62      itojun   1173:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1174:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1175:                        if (hbhlen != ext->m_len) {
                   1176:                                m_freem(ext);
1.116     thorpej  1177:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1178:                                return;
                   1179:                        }
1.2       itojun   1180:
                   1181:                        /*
                   1182:                         * XXX: We copy whole the header even if a jumbo
                   1183:                         * payload option is included, which option is to
                   1184:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1185:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1186:                         */
1.97      christos 1187:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1188:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1189:                            IPPROTO_IPV6);
1.2       itojun   1190:                        if (*mp)
                   1191:                                mp = &(*mp)->m_next;
1.62      itojun   1192:                        m_freem(ext);
1.2       itojun   1193:                }
                   1194:        }
                   1195:
                   1196:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1197:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1198:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1199:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1200:
                   1201:                /*
                   1202:                 * Search for destination options headers or routing
                   1203:                 * header(s) through the header chain, and stores each
                   1204:                 * header as ancillary data.
                   1205:                 * Note that the order of the headers remains in
                   1206:                 * the chain of ancillary data.
                   1207:                 */
1.86      rpaulo   1208:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1209:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1210:                        int elen;
1.62      itojun   1211:                        struct mbuf *ext = NULL;
1.9       itojun   1212:
1.62      itojun   1213:                        /*
                   1214:                         * if it is not an extension header, don't try to
                   1215:                         * pull it from the chain.
                   1216:                         */
                   1217:                        switch (nxt) {
                   1218:                        case IPPROTO_DSTOPTS:
                   1219:                        case IPPROTO_ROUTING:
                   1220:                        case IPPROTO_HOPOPTS:
                   1221:                        case IPPROTO_AH: /* is it possible? */
                   1222:                                break;
                   1223:                        default:
                   1224:                                goto loopend;
                   1225:                        }
                   1226:
                   1227:                        ext = ip6_pullexthdr(m, off, nxt);
                   1228:                        if (ext == NULL) {
1.116     thorpej  1229:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1230:                                return;
                   1231:                        }
1.62      itojun   1232:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1233:                        if (nxt == IPPROTO_AH)
                   1234:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1235:                        else
                   1236:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1237:                        if (elen != ext->m_len) {
                   1238:                                m_freem(ext);
1.116     thorpej  1239:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1240:                                return;
                   1241:                        }
1.57      thorpej  1242:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1243:
1.35      itojun   1244:                        switch (nxt) {
1.62      itojun   1245:                        case IPPROTO_DSTOPTS:
1.127     martin   1246:                                if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35      itojun   1247:                                        break;
                   1248:
1.97      christos 1249:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1250:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1251:                                    IPPROTO_IPV6);
1.35      itojun   1252:                                if (*mp)
                   1253:                                        mp = &(*mp)->m_next;
                   1254:                                break;
                   1255:
                   1256:                        case IPPROTO_ROUTING:
1.127     martin   1257:                                if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35      itojun   1258:                                        break;
                   1259:
1.97      christos 1260:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1261:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1262:                                    IPPROTO_IPV6);
1.35      itojun   1263:                                if (*mp)
                   1264:                                        mp = &(*mp)->m_next;
                   1265:                                break;
                   1266:
1.62      itojun   1267:                        case IPPROTO_HOPOPTS:
                   1268:                        case IPPROTO_AH: /* is it possible? */
                   1269:                                break;
                   1270:
1.35      itojun   1271:                        default:
                   1272:                                /*
1.62      itojun   1273:                                 * other cases have been filtered in the above.
                   1274:                                 * none will visit this case.  here we supply
                   1275:                                 * the code just in case (nxt overwritten or
                   1276:                                 * other cases).
1.35      itojun   1277:                                 */
1.62      itojun   1278:                                m_freem(ext);
1.35      itojun   1279:                                goto loopend;
                   1280:
1.2       itojun   1281:                        }
                   1282:
                   1283:                        /* proceed with the next header. */
1.9       itojun   1284:                        off += elen;
1.2       itojun   1285:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1286:                        ip6e = NULL;
                   1287:                        m_freem(ext);
                   1288:                        ext = NULL;
1.2       itojun   1289:                }
                   1290:          loopend:
1.62      itojun   1291:                ;
1.2       itojun   1292:        }
1.62      itojun   1293: }
1.85      rpaulo   1294: #undef IS2292
                   1295:
                   1296:
                   1297: void
1.95      dyoung   1298: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1299:     uint32_t *mtu)
1.85      rpaulo   1300: {
                   1301:        struct socket *so;
                   1302:        struct mbuf *m_mtu;
                   1303:        struct ip6_mtuinfo mtuctl;
                   1304:
                   1305:        so = in6p->in6p_socket;
                   1306:
                   1307:        if (mtu == NULL)
                   1308:                return;
                   1309:
                   1310: #ifdef DIAGNOSTIC
                   1311:        if (so == NULL)         /* I believe this is impossible */
                   1312:                panic("ip6_notify_pmtu: socket is NULL");
                   1313: #endif
                   1314:
                   1315:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1316:        mtuctl.ip6m_mtu = *mtu;
                   1317:        mtuctl.ip6m_addr = *dst;
                   1318:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1319:                return;
                   1320:
1.97      christos 1321:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1322:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1323:                return;
                   1324:
1.95      dyoung   1325:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1326:            == 0) {
                   1327:                m_freem(m_mtu);
                   1328:                /* XXX: should count statistics */
                   1329:        } else
                   1330:                sorwakeup(so);
                   1331:
                   1332:        return;
                   1333: }
1.62      itojun   1334:
                   1335: /*
                   1336:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1337:  * contains the result, or NULL on error.
                   1338:  */
                   1339: static struct mbuf *
1.107     christos 1340: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1341: {
                   1342:        struct ip6_ext ip6e;
                   1343:        size_t elen;
                   1344:        struct mbuf *n;
                   1345:
                   1346: #ifdef DIAGNOSTIC
                   1347:        switch (nxt) {
                   1348:        case IPPROTO_DSTOPTS:
                   1349:        case IPPROTO_ROUTING:
                   1350:        case IPPROTO_HOPOPTS:
                   1351:        case IPPROTO_AH: /* is it possible? */
                   1352:                break;
                   1353:        default:
                   1354:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1355:        }
1.62      itojun   1356: #endif
1.2       itojun   1357:
1.97      christos 1358:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1359:        if (nxt == IPPROTO_AH)
                   1360:                elen = (ip6e.ip6e_len + 2) << 2;
                   1361:        else
                   1362:                elen = (ip6e.ip6e_len + 1) << 3;
                   1363:
                   1364:        MGET(n, M_DONTWAIT, MT_DATA);
                   1365:        if (n && elen >= MLEN) {
                   1366:                MCLGET(n, M_DONTWAIT);
                   1367:                if ((n->m_flags & M_EXT) == 0) {
                   1368:                        m_free(n);
                   1369:                        n = NULL;
                   1370:                }
                   1371:        }
                   1372:        if (!n)
                   1373:                return NULL;
                   1374:
                   1375:        n->m_len = 0;
                   1376:        if (elen >= M_TRAILINGSPACE(n)) {
                   1377:                m_free(n);
                   1378:                return NULL;
                   1379:        }
                   1380:
1.97      christos 1381:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1382:        n->m_len = elen;
                   1383:        return n;
1.2       itojun   1384: }
                   1385:
                   1386: /*
                   1387:  * Get pointer to the previous header followed by the header
                   1388:  * currently processed.
                   1389:  * XXX: This function supposes that
                   1390:  *     M includes all headers,
                   1391:  *     the next header field and the header length field of each header
                   1392:  *     are valid, and
                   1393:  *     the sum of each header length equals to OFF.
                   1394:  * Because of these assumptions, this function must be called very
                   1395:  * carefully. Moreover, it will not be used in the near future when
                   1396:  * we develop `neater' mechanism to process extension headers.
                   1397:  */
1.58      itojun   1398: u_int8_t *
1.107     christos 1399: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1400: {
                   1401:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1402:
                   1403:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1404:                return (&ip6->ip6_nxt);
1.2       itojun   1405:        else {
                   1406:                int len, nxt;
                   1407:                struct ip6_ext *ip6e = NULL;
                   1408:
                   1409:                nxt = ip6->ip6_nxt;
                   1410:                len = sizeof(struct ip6_hdr);
                   1411:                while (len < off) {
1.97      christos 1412:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1413:
1.35      itojun   1414:                        switch (nxt) {
1.2       itojun   1415:                        case IPPROTO_FRAGMENT:
                   1416:                                len += sizeof(struct ip6_frag);
                   1417:                                break;
                   1418:                        case IPPROTO_AH:
                   1419:                                len += (ip6e->ip6e_len + 2) << 2;
                   1420:                                break;
                   1421:                        default:
                   1422:                                len += (ip6e->ip6e_len + 1) << 3;
                   1423:                                break;
                   1424:                        }
                   1425:                        nxt = ip6e->ip6e_nxt;
                   1426:                }
                   1427:                if (ip6e)
1.58      itojun   1428:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1429:                else
                   1430:                        return NULL;
1.18      itojun   1431:        }
                   1432: }
                   1433:
                   1434: /*
                   1435:  * get next header offset.  m will be retained.
                   1436:  */
                   1437: int
1.107     christos 1438: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1439: {
                   1440:        struct ip6_hdr ip6;
                   1441:        struct ip6_ext ip6e;
                   1442:        struct ip6_frag fh;
                   1443:
                   1444:        /* just in case */
                   1445:        if (m == NULL)
                   1446:                panic("ip6_nexthdr: m == NULL");
                   1447:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1448:                return -1;
                   1449:
                   1450:        switch (proto) {
                   1451:        case IPPROTO_IPV6:
1.83      rpaulo   1452:                /* do not chase beyond intermediate IPv6 headers */
                   1453:                if (off != 0)
                   1454:                        return -1;
1.18      itojun   1455:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1456:                        return -1;
1.97      christos 1457:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1458:                if (nxtp)
                   1459:                        *nxtp = ip6.ip6_nxt;
                   1460:                off += sizeof(ip6);
                   1461:                return off;
                   1462:
                   1463:        case IPPROTO_FRAGMENT:
                   1464:                /*
                   1465:                 * terminate parsing if it is not the first fragment,
                   1466:                 * it does not make sense to parse through it.
                   1467:                 */
                   1468:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1469:                        return -1;
1.97      christos 1470:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1471:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1472:                        return -1;
                   1473:                if (nxtp)
                   1474:                        *nxtp = fh.ip6f_nxt;
                   1475:                off += sizeof(struct ip6_frag);
                   1476:                return off;
                   1477:
                   1478:        case IPPROTO_AH:
                   1479:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1480:                        return -1;
1.97      christos 1481:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1482:                if (nxtp)
                   1483:                        *nxtp = ip6e.ip6e_nxt;
                   1484:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1485:                if (m->m_pkthdr.len < off)
                   1486:                        return -1;
1.18      itojun   1487:                return off;
                   1488:
                   1489:        case IPPROTO_HOPOPTS:
                   1490:        case IPPROTO_ROUTING:
                   1491:        case IPPROTO_DSTOPTS:
                   1492:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1493:                        return -1;
1.97      christos 1494:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1495:                if (nxtp)
                   1496:                        *nxtp = ip6e.ip6e_nxt;
                   1497:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1498:                if (m->m_pkthdr.len < off)
                   1499:                        return -1;
1.18      itojun   1500:                return off;
                   1501:
                   1502:        case IPPROTO_NONE:
                   1503:        case IPPROTO_ESP:
                   1504:        case IPPROTO_IPCOMP:
                   1505:                /* give up */
                   1506:                return -1;
                   1507:
                   1508:        default:
                   1509:                return -1;
                   1510:        }
                   1511: }
                   1512:
                   1513: /*
                   1514:  * get offset for the last header in the chain.  m will be kept untainted.
                   1515:  */
                   1516: int
1.107     christos 1517: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1518: {
                   1519:        int newoff;
                   1520:        int nxt;
                   1521:
                   1522:        if (!nxtp) {
                   1523:                nxt = -1;
                   1524:                nxtp = &nxt;
                   1525:        }
1.86      rpaulo   1526:        for (;;) {
1.18      itojun   1527:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1528:                if (newoff < 0)
                   1529:                        return off;
                   1530:                else if (newoff < off)
                   1531:                        return -1;      /* invalid */
                   1532:                else if (newoff == off)
                   1533:                        return newoff;
                   1534:
                   1535:                off = newoff;
                   1536:                proto = *nxtp;
1.2       itojun   1537:        }
                   1538: }
                   1539:
1.81      rpaulo   1540: struct m_tag *
1.107     christos 1541: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1542: {
                   1543:        struct m_tag *mtag;
                   1544:
                   1545:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1546:        if (!mtag) {
                   1547:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1548:                    M_NOWAIT);
                   1549:                if (mtag) {
                   1550:                        m_tag_prepend(m, mtag);
1.124     cegger   1551:                        memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81      rpaulo   1552:                }
                   1553:        }
                   1554:        return mtag;
                   1555: }
                   1556:
                   1557: struct m_tag *
1.107     christos 1558: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1559: {
                   1560:        struct m_tag *mtag;
                   1561:
                   1562:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1563:        return mtag;
                   1564: }
                   1565:
                   1566: void
1.107     christos 1567: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1568: {
                   1569:        struct m_tag *mtag;
                   1570:
                   1571:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1572:        if (mtag)
                   1573:                m_tag_delete(m, mtag);
                   1574: }
                   1575:
1.98      liamjfoy 1576: #ifdef GATEWAY
                   1577: /*
                   1578:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1579:  * we could reduce this value, call ip6flow_reap();
                   1580:  */
                   1581: static int
1.101     liamjfoy 1582: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98      liamjfoy 1583: {
1.121     simonb   1584:        int error;
1.98      liamjfoy 1585:
1.121     simonb   1586:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1587:        if (error || newp == NULL)
                   1588:                return (error);
1.98      liamjfoy 1589:
1.121     simonb   1590:        mutex_enter(softnet_lock);
1.122     matt     1591:        KERNEL_LOCK(1, NULL);
1.120     matt     1592:
1.121     simonb   1593:        ip6flow_reap(0);
1.120     matt     1594:
                   1595:        KERNEL_UNLOCK_ONE(NULL);
1.121     simonb   1596:        mutex_exit(softnet_lock);
1.98      liamjfoy 1597:
1.121     simonb   1598:        return (0);
1.98      liamjfoy 1599: }
1.99      liamjfoy 1600:
                   1601: static int
                   1602: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1603: {
                   1604:        int error, tmp;
                   1605:        struct sysctlnode node;
                   1606:
                   1607:        node = *rnode;
                   1608:        tmp = ip6_hashsize;
                   1609:        node.sysctl_data = &tmp;
                   1610:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1611:        if (error || newp == NULL)
                   1612:                return (error);
                   1613:
                   1614:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1615:                /*
                   1616:                 * Can only fail due to malloc()
                   1617:                 */
1.120     matt     1618:                mutex_enter(softnet_lock);
1.122     matt     1619:                KERNEL_LOCK(1, NULL);
1.120     matt     1620:
                   1621:                error = ip6flow_invalidate_all(tmp);
                   1622:
                   1623:                KERNEL_UNLOCK_ONE(NULL);
                   1624:                mutex_exit(softnet_lock);
1.99      liamjfoy 1625:        } else {
                   1626:                /*
                   1627:                 * EINVAL if not a power of 2
1.121     simonb   1628:                 */
1.120     matt     1629:                error = EINVAL;
1.99      liamjfoy 1630:        }
                   1631:
1.120     matt     1632:        return error;
1.99      liamjfoy 1633: }
1.98      liamjfoy 1634: #endif /* GATEWAY */
                   1635:
1.2       itojun   1636: /*
                   1637:  * System control for IP6
                   1638:  */
                   1639:
1.120     matt     1640: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2       itojun   1641:        0,              0,              0,              0,
                   1642:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1643:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1644:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1645:        0,              0,              0,              0,
                   1646:        ENOPROTOOPT
                   1647: };
                   1648:
1.116     thorpej  1649: static int
                   1650: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
                   1651: {
                   1652:
1.119     thorpej  1653:        return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116     thorpej  1654: }
                   1655:
1.128     pooka    1656: static void
                   1657: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2       itojun   1658: {
1.85      rpaulo   1659: #ifdef RFC2292
                   1660: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1661: #else
                   1662: #define IS2292(x, y)   (y)
                   1663: #endif
1.26      itojun   1664:
1.73      atatat   1665:        sysctl_createv(clog, 0, NULL, NULL,
                   1666:                       CTLFLAG_PERMANENT,
1.74      atatat   1667:                       CTLTYPE_NODE, "inet6",
                   1668:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1669:                       NULL, 0, NULL, 0,
                   1670:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1671:        sysctl_createv(clog, 0, NULL, NULL,
                   1672:                       CTLFLAG_PERMANENT,
1.74      atatat   1673:                       CTLTYPE_NODE, "ip6",
                   1674:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1675:                       NULL, 0, NULL, 0,
                   1676:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1677:
1.73      atatat   1678:        sysctl_createv(clog, 0, NULL, NULL,
                   1679:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1680:                       CTLTYPE_INT, "forwarding",
                   1681:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1682:                       NULL, 0, &ip6_forwarding, 0,
                   1683:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1684:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1685:        sysctl_createv(clog, 0, NULL, NULL,
                   1686:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1687:                       CTLTYPE_INT, "redirect",
                   1688:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1689:                       NULL, 0, &ip6_sendredirects, 0,
                   1690:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1691:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1692:        sysctl_createv(clog, 0, NULL, NULL,
                   1693:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1694:                       CTLTYPE_INT, "hlim",
                   1695:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1696:                       NULL, 0, &ip6_defhlim, 0,
                   1697:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1698:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1699: #ifdef notyet
1.73      atatat   1700:        sysctl_createv(clog, 0, NULL, NULL,
                   1701:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1702:                       CTLTYPE_INT, "mtu", NULL,
                   1703:                       NULL, 0, &, 0,
                   1704:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1705:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1706: #endif
                   1707: #ifdef __no_idea__
1.73      atatat   1708:        sysctl_createv(clog, 0, NULL, NULL,
                   1709:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1710:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1711:                       NULL, 0, &?, 0,
                   1712:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1713:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1714:        sysctl_createv(clog, 0, NULL, NULL,
                   1715:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1716:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1717:                       NULL, 0, &?, sizeof(?),
                   1718:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1719:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1720:        sysctl_createv(clog, 0, NULL, NULL,
                   1721:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1722:                       CTLTYPE_?, "mrtproto", NULL,
                   1723:                       NULL, 0, &?, sizeof(?),
                   1724:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1725:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1726: #endif
1.73      atatat   1727:        sysctl_createv(clog, 0, NULL, NULL,
                   1728:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1729:                       CTLTYPE_INT, "maxfragpackets",
                   1730:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1731:                                    "for reassembly"),
1.70      atatat   1732:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1733:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1734:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1735: #ifdef __no_idea__
1.73      atatat   1736:        sysctl_createv(clog, 0, NULL, NULL,
                   1737:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1738:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1739:                       NULL, 0, &?, 0,
                   1740:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1741:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1742:        sysctl_createv(clog, 0, NULL, NULL,
                   1743:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1744:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1745:                       NULL, 0, &?, 0,
                   1746:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1747:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1748: #endif
1.73      atatat   1749:        sysctl_createv(clog, 0, NULL, NULL,
                   1750:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1751:                       CTLTYPE_INT, "accept_rtadv",
                   1752:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1753:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1754:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1755:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1756:        sysctl_createv(clog, 0, NULL, NULL,
                   1757:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.131     spz      1758:                       CTLTYPE_INT, "rtadv_maxroutes",
                   1759:                       SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"),
                   1760:                       NULL, 0, &ip6_rtadv_maxroutes, 0,
                   1761:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1762:                       IPV6CTL_RTADV_MAXROUTES, CTL_EOL);
                   1763:        sysctl_createv(clog, 0, NULL, NULL,
                   1764:                       CTLFLAG_PERMANENT,
                   1765:                       CTLTYPE_INT, "rtadv_numroutes",
                   1766:                       SYSCTL_DESCR("Current number of routes accepted via router advertisements"),
                   1767:                       NULL, 0, &nd6_numroutes, 0,
                   1768:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1769:                       IPV6CTL_RTADV_NUMROUTES, CTL_EOL);
                   1770:        sysctl_createv(clog, 0, NULL, NULL,
                   1771:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1772:                       CTLTYPE_INT, "keepfaith",
                   1773:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1774:                       NULL, 0, &ip6_keepfaith, 0,
                   1775:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1776:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1777:        sysctl_createv(clog, 0, NULL, NULL,
                   1778:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1779:                       CTLTYPE_INT, "log_interval",
                   1780:                       SYSCTL_DESCR("Minumum interval between logging "
                   1781:                                    "unroutable packets"),
1.70      atatat   1782:                       NULL, 0, &ip6_log_interval, 0,
                   1783:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1784:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1785:        sysctl_createv(clog, 0, NULL, NULL,
                   1786:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1787:                       CTLTYPE_INT, "hdrnestlimit",
                   1788:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1789:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1790:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1791:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1792:        sysctl_createv(clog, 0, NULL, NULL,
                   1793:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1794:                       CTLTYPE_INT, "dad_count",
                   1795:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1796:                                    "probes to send"),
1.70      atatat   1797:                       NULL, 0, &ip6_dad_count, 0,
                   1798:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1799:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1800:        sysctl_createv(clog, 0, NULL, NULL,
                   1801:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1802:                       CTLTYPE_INT, "auto_flowlabel",
                   1803:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1804:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1805:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1806:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1807:        sysctl_createv(clog, 0, NULL, NULL,
                   1808:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1809:                       CTLTYPE_INT, "defmcasthlim",
                   1810:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1811:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1812:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1813:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1814: #if NGIF > 0
1.73      atatat   1815:        sysctl_createv(clog, 0, NULL, NULL,
                   1816:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1817:                       CTLTYPE_INT, "gifhlim",
                   1818:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1819:                       NULL, 0, &ip6_gif_hlim, 0,
                   1820:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1821:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1822: #endif /* NGIF */
1.73      atatat   1823:        sysctl_createv(clog, 0, NULL, NULL,
                   1824:                       CTLFLAG_PERMANENT,
1.74      atatat   1825:                       CTLTYPE_STRING, "kame_version",
                   1826:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1827:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1828:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1829:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1830:        sysctl_createv(clog, 0, NULL, NULL,
                   1831:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1832:                       CTLTYPE_INT, "use_deprecated",
                   1833:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1834:                                    "source addresses"),
1.70      atatat   1835:                       NULL, 0, &ip6_use_deprecated, 0,
                   1836:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1837:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1838:        sysctl_createv(clog, 0, NULL, NULL,
                   1839:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1840:                       CTLTYPE_INT, "rr_prune", NULL,
                   1841:                       NULL, 0, &ip6_rr_prune, 0,
                   1842:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1843:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1844:        sysctl_createv(clog, 0, NULL, NULL,
                   1845:                       CTLFLAG_PERMANENT
1.70      atatat   1846: #ifndef INET6_BINDV6ONLY
1.73      atatat   1847:                       |CTLFLAG_READWRITE,
1.70      atatat   1848: #endif
1.74      atatat   1849:                       CTLTYPE_INT, "v6only",
                   1850:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1851:                                    "to PF_INET sockets"),
1.70      atatat   1852:                       NULL, 0, &ip6_v6only, 0,
                   1853:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1854:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1855:        sysctl_createv(clog, 0, NULL, NULL,
                   1856:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.140.2.3! tls      1857:                       CTLTYPE_INT, "auto_linklocal",
        !          1858:                       SYSCTL_DESCR("Default value of per-interface flag for "
        !          1859:                                    "adding an IPv6 link-local address to "
        !          1860:                                    "interfaces when attached"),
        !          1861:                       NULL, 0, &ip6_auto_linklocal, 0,
        !          1862:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
        !          1863:                       IPV6CTL_AUTO_LINKLOCAL, CTL_EOL);
        !          1864:        sysctl_createv(clog, 0, NULL, NULL,
        !          1865:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1866:                       CTLTYPE_INT, "anonportmin",
                   1867:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1868:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1869:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1870:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1871:        sysctl_createv(clog, 0, NULL, NULL,
                   1872:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1873:                       CTLTYPE_INT, "anonportmax",
                   1874:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1875:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1876:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1877:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1878: #ifndef IPNOPRIVPORTS
1.73      atatat   1879:        sysctl_createv(clog, 0, NULL, NULL,
                   1880:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1881:                       CTLTYPE_INT, "lowportmin",
                   1882:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1883:                                    "to assign"),
1.70      atatat   1884:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1885:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1886:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1887:        sysctl_createv(clog, 0, NULL, NULL,
                   1888:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1889:                       CTLTYPE_INT, "lowportmax",
                   1890:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1891:                                    "to assign"),
1.70      atatat   1892:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1893:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1894:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1895: #endif /* IPNOPRIVPORTS */
1.73      atatat   1896:        sysctl_createv(clog, 0, NULL, NULL,
                   1897:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1898:                       CTLTYPE_INT, "use_tempaddr",
                   1899:                       SYSCTL_DESCR("Use temporary address"),
                   1900:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1901:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1902:                       CTL_CREATE, CTL_EOL);
                   1903:        sysctl_createv(clog, 0, NULL, NULL,
                   1904:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1905:                       CTLTYPE_INT, "temppltime",
                   1906:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1907:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1908:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1909:                       CTL_CREATE, CTL_EOL);
                   1910:        sysctl_createv(clog, 0, NULL, NULL,
                   1911:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1912:                       CTLTYPE_INT, "tempvltime",
                   1913:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1914:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1915:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1916:                       CTL_CREATE, CTL_EOL);
                   1917:        sysctl_createv(clog, 0, NULL, NULL,
                   1918:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1919:                       CTLTYPE_INT, "maxfrags",
                   1920:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1921:                       NULL, 0, &ip6_maxfrags, 0,
                   1922:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1923:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1924:        sysctl_createv(clog, 0, NULL, NULL,
                   1925:                       CTLFLAG_PERMANENT,
                   1926:                       CTLTYPE_STRUCT, "stats",
                   1927:                       SYSCTL_DESCR("IPv6 statistics"),
1.116     thorpej  1928:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1929:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1930:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1931:        sysctl_createv(clog, 0, NULL, NULL,
                   1932:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1933:                       CTLTYPE_INT, "use_defaultzone",
                   1934:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1935:                       NULL, 0, &ip6_use_defzone, 0,
                   1936:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1937:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1938:        sysctl_createv(clog, 0, NULL, NULL,
                   1939:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1940:                       CTLTYPE_INT, "mcast_pmtu",
                   1941:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1942:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1943:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1944:                       CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1945: #ifdef GATEWAY
                   1946:        sysctl_createv(clog, 0, NULL, NULL,
                   1947:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1948:                        CTLTYPE_INT, "maxflows",
                   1949:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1950:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1951:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1952:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1953:        sysctl_createv(clog, 0, NULL, NULL,
                   1954:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1955:                        CTLTYPE_INT, "hashsize",
                   1956:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1957:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1958:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1959:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1960: #endif
1.138     christos 1961:        /* anonportalgo RFC6056 subtree */
1.140     christos 1962:        const struct sysctlnode *portalgo_node;
                   1963:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.138     christos 1964:                       CTLFLAG_PERMANENT,
                   1965:                       CTLTYPE_NODE, "anonportalgo",
                   1966:                       SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"),
                   1967:                       NULL, 0, NULL, 0,
                   1968:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL);
1.140     christos 1969:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.138     christos 1970:                       CTLFLAG_PERMANENT,
                   1971:                       CTLTYPE_STRING, "available",
                   1972:                       SYSCTL_DESCR("available algorithms"),
1.140     christos 1973:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.138     christos 1974:                       CTL_CREATE, CTL_EOL);
1.140     christos 1975:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.138     christos 1976:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1977:                       CTLTYPE_STRING, "selected",
                   1978:                       SYSCTL_DESCR("selected algorithm"),
1.140     christos 1979:                       sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN,
1.138     christos 1980:                       CTL_CREATE, CTL_EOL);
1.140.2.1  tls      1981:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1982:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1983:                       CTLTYPE_STRUCT, "reserve",
                   1984:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1985:                       sysctl_portalgo_reserve6, 0, NULL, 0,
                   1986:                       CTL_CREATE, CTL_EOL);
1.139     christos 1987:        sysctl_createv(clog, 0, NULL, NULL,
                   1988:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1989:                       CTLTYPE_INT, "neighborgcthresh",
                   1990:                       SYSCTL_DESCR("Maximum number of entries in neighbor"
                   1991:                        " cache"),
                   1992:                       NULL, 1, &ip6_neighborgcthresh, 0,
                   1993:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1994:                       CTL_CREATE, CTL_EOL);
                   1995:        sysctl_createv(clog, 0, NULL, NULL,
                   1996:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1997:                       CTLTYPE_INT, "maxifprefixes",
                   1998:                       SYSCTL_DESCR("Maximum number of prefixes created by"
                   1999:                           " route advertisement per interface"),
                   2000:                       NULL, 1, &ip6_maxifprefixes, 0,
                   2001:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   2002:                       CTL_CREATE, CTL_EOL);
                   2003:        sysctl_createv(clog, 0, NULL, NULL,
                   2004:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2005:                       CTLTYPE_INT, "maxifdefrouters",
                   2006:                       SYSCTL_DESCR("Maximum number of default routers created"
                   2007:                           " by route advertisement per interface"),
                   2008:                       NULL, 1, &ip6_maxifdefrouters, 0,
                   2009:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   2010:                       CTL_CREATE, CTL_EOL);
                   2011:        sysctl_createv(clog, 0, NULL, NULL,
                   2012:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2013:                       CTLTYPE_INT, "maxdynroutes",
                   2014:                       SYSCTL_DESCR("Maximum number of routes created via"
                   2015:                           " redirect"),
                   2016:                       NULL, 1, &ip6_maxdynroutes, 0,
                   2017:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   2018:                       CTL_CREATE, CTL_EOL);
1.2       itojun   2019: }
1.116     thorpej  2020:
                   2021: void
                   2022: ip6_statinc(u_int stat)
                   2023: {
                   2024:
                   2025:        KASSERT(stat < IP6_NSTATS);
                   2026:        IP6_STATINC(stat);
                   2027: }

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