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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.142

1.142   ! christos    1: /*     $NetBSD: ip6_input.c,v 1.141 2012/11/29 02:07:20 christos Exp $ */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
1.65      agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.142   ! christos   65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.141 2012/11/29 02:07:20 christos Exp $");
1.2       itojun     66:
1.129     joerg      67: #include "opt_gateway.h"
1.2       itojun     68: #include "opt_inet.h"
1.85      rpaulo     69: #include "opt_inet6.h"
1.4       thorpej    70: #include "opt_ipsec.h"
1.15      darrenr    71: #include "opt_pfil_hooks.h"
1.123     christos   72: #include "opt_compat_netbsd.h"
1.2       itojun     73:
                     74: #include <sys/param.h>
                     75: #include <sys/systm.h>
                     76: #include <sys/malloc.h>
                     77: #include <sys/mbuf.h>
                     78: #include <sys/domain.h>
                     79: #include <sys/protosw.h>
                     80: #include <sys/socket.h>
                     81: #include <sys/socketvar.h>
                     82: #include <sys/errno.h>
                     83: #include <sys/time.h>
                     84: #include <sys/kernel.h>
                     85: #include <sys/syslog.h>
                     86: #include <sys/proc.h>
1.46      simonb     87: #include <sys/sysctl.h>
1.133     tls        88: #include <sys/cprng.h>
1.2       itojun     89:
                     90: #include <net/if.h>
                     91: #include <net/if_types.h>
                     92: #include <net/if_dl.h>
                     93: #include <net/route.h>
                     94: #include <net/netisr.h>
1.15      darrenr    95: #ifdef PFIL_HOOKS
                     96: #include <net/pfil.h>
                     97: #endif
1.2       itojun     98:
                     99: #include <netinet/in.h>
1.9       itojun    100: #include <netinet/in_systm.h>
                    101: #ifdef INET
                    102: #include <netinet/ip.h>
                    103: #include <netinet/ip_icmp.h>
1.45      itojun    104: #endif /* INET */
1.14      itojun    105: #include <netinet/ip6.h>
1.140     christos  106: #include <netinet/portalgo.h>
1.2       itojun    107: #include <netinet6/in6_var.h>
1.11      itojun    108: #include <netinet6/ip6_var.h>
1.116     thorpej   109: #include <netinet6/ip6_private.h>
1.2       itojun    110: #include <netinet6/in6_pcb.h>
1.14      itojun    111: #include <netinet/icmp6.h>
1.81      rpaulo    112: #include <netinet6/scope6_var.h>
1.2       itojun    113: #include <netinet6/in6_ifattach.h>
                    114: #include <netinet6/nd6.h>
                    115:
1.142   ! christos  116: #ifdef IPSEC
1.94      degroote  117: #include <netipsec/ipsec.h>
                    118: #include <netipsec/ipsec6.h>
                    119: #include <netipsec/key.h>
1.142   ! christos  120: #endif /* IPSEC */
1.94      degroote  121:
1.123     christos  122: #ifdef COMPAT_50
                    123: #include <compat/sys/time.h>
                    124: #include <compat/sys/socket.h>
                    125: #endif
                    126:
1.2       itojun    127: #include <netinet6/ip6protosw.h>
                    128:
                    129: #include "faith.h"
                    130: #include "gif.h"
1.50      itojun    131:
                    132: #if NGIF > 0
                    133: #include <netinet6/in6_gif.h>
                    134: #endif
1.2       itojun    135:
1.9       itojun    136: #include <net/net_osdep.h>
                    137:
1.2       itojun    138: extern struct domain inet6domain;
                    139:
                    140: u_char ip6_protox[IPPROTO_MAX];
                    141: static int ip6qmaxlen = IFQ_MAXLEN;
                    142: struct in6_ifaddr *in6_ifaddr;
                    143: struct ifqueue ip6intrq;
                    144:
1.108     ad        145: extern callout_t in6_tmpaddrtimer_ch;
1.83      rpaulo    146:
1.2       itojun    147: int ip6_forward_srcrt;                 /* XXX */
                    148: int ip6_sourcecheck;                   /* XXX */
                    149: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    150:
1.29      thorpej   151: #ifdef PFIL_HOOKS
                    152: struct pfil_head inet6_pfil_hook;
                    153: #endif
                    154:
1.116     thorpej   155: percpu_t *ip6stat_percpu;
1.2       itojun    156:
1.111     dyoung    157: static void ip6_init2(void *);
1.112     dyoung    158: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    159:
1.136     drochner  160: static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
                    161:        u_int32_t *);
1.111     dyoung    162: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128     pooka     163: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2       itojun    164:
                    165: /*
                    166:  * IP6 initialization: fill in IP6 protocol switch table.
                    167:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    168:  */
                    169: void
1.114     matt      170: ip6_init(void)
1.2       itojun    171: {
1.78      christos  172:        const struct ip6protosw *pr;
1.35      itojun    173:        int i;
1.2       itojun    174:
1.128     pooka     175:        sysctl_net_inet6_ip6_setup(NULL);
1.78      christos  176:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    177:        if (pr == 0)
                    178:                panic("ip6_init");
                    179:        for (i = 0; i < IPPROTO_MAX; i++)
                    180:                ip6_protox[i] = pr - inet6sw;
1.78      christos  181:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    182:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    183:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    184:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    185:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    186:        ip6intrq.ifq_maxlen = ip6qmaxlen;
1.81      rpaulo    187:        scope6_init();
                    188:        addrsel_policy_init();
1.2       itojun    189:        nd6_init();
                    190:        frag6_init();
1.133     tls       191:        ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    192:
1.135     christos  193:        ip6_init2(NULL);
1.98      liamjfoy  194: #ifdef GATEWAY
1.99      liamjfoy  195:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  196: #endif
1.29      thorpej   197:
                    198: #ifdef PFIL_HOOKS
                    199:        /* Register our Packet Filter hook. */
1.33      thorpej   200:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
                    201:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   202:        i = pfil_head_register(&inet6_pfil_hook);
                    203:        if (i != 0)
                    204:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    205:                    "error %d\n", i);
                    206: #endif /* PFIL_HOOKS */
1.116     thorpej   207:
                    208:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2       itojun    209: }
                    210:
                    211: static void
1.90      christos  212: ip6_init2(void *dummy)
1.2       itojun    213: {
                    214:
                    215:        /* nd6_timer_init */
1.118     ad        216:        callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19      thorpej   217:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    218:
                    219:        /* timer for regeneranation of temporary addresses randomize ID */
1.118     ad        220:        callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83      rpaulo    221:        callout_reset(&in6_tmpaddrtimer_ch,
                    222:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    223:                       ip6_temp_regen_advance) * hz,
                    224:                      in6_tmpaddrtimer, NULL);
1.2       itojun    225: }
                    226:
                    227: /*
                    228:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    229:  */
                    230: void
1.114     matt      231: ip6intr(void)
1.2       itojun    232: {
                    233:        int s;
                    234:        struct mbuf *m;
                    235:
1.118     ad        236:        mutex_enter(softnet_lock);
                    237:        KERNEL_LOCK(1, NULL);
1.2       itojun    238:        for (;;) {
1.41      thorpej   239:                s = splnet();
1.2       itojun    240:                IF_DEQUEUE(&ip6intrq, m);
                    241:                splx(s);
                    242:                if (m == 0)
1.118     ad        243:                        break;
1.83      rpaulo    244:                /* drop the packet if IPv6 operation is disabled on the IF */
                    245:                if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
                    246:                        m_freem(m);
1.118     ad        247:                        break;
1.83      rpaulo    248:                }
1.2       itojun    249:                ip6_input(m);
                    250:        }
1.118     ad        251:        KERNEL_UNLOCK_ONE(NULL);
                    252:        mutex_exit(softnet_lock);
1.2       itojun    253: }
                    254:
1.103     dyoung    255: extern struct  route ip6_forward_rt;
1.2       itojun    256:
                    257: void
1.96      dyoung    258: ip6_input(struct mbuf *m)
1.2       itojun    259: {
1.9       itojun    260:        struct ip6_hdr *ip6;
1.105     dyoung    261:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    262:        u_int32_t plen;
1.5       itojun    263:        u_int32_t rtalert = ~0;
1.104     yamt      264:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    265:        struct ifnet *deliverifp = NULL;
1.64      itojun    266:        int srcrt = 0;
1.105     dyoung    267:        const struct rtentry *rt;
                    268:        union {
                    269:                struct sockaddr         dst;
                    270:                struct sockaddr_in6     dst6;
                    271:        } u;
1.142   ! christos  272: #ifdef IPSEC
1.94      degroote  273:        struct m_tag *mtag;
                    274:        struct tdb_ident *tdbi;
                    275:        struct secpolicy *sp;
                    276:        int s, error;
                    277: #endif
1.2       itojun    278:
                    279:        /*
1.81      rpaulo    280:         * make sure we don't have onion peering information into m_tag.
                    281:         */
                    282:        ip6_delaux(m);
                    283:
                    284:        /*
1.44      itojun    285:         * mbuf statistics
1.2       itojun    286:         */
                    287:        if (m->m_flags & M_EXT) {
                    288:                if (m->m_next)
1.116     thorpej   289:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    290:                else
1.116     thorpej   291:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    292:        } else {
1.115     thorpej   293: #define M2MMAX 32
1.2       itojun    294:                if (m->m_next) {
1.9       itojun    295:                        if (m->m_flags & M_LOOP) {
1.116     thorpej   296:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115     thorpej   297:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116     thorpej   298:                                IP6_STATINC(IP6_STAT_M2M +
                    299:                                            m->m_pkthdr.rcvif->if_index);
1.115     thorpej   300:                        } else
1.116     thorpej   301:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    302:                } else
1.116     thorpej   303:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    304: #undef M2MMAX
1.2       itojun    305:        }
                    306:
1.9       itojun    307:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116     thorpej   308:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    309:
1.57      thorpej   310:        /*
                    311:         * If the IPv6 header is not aligned, slurp it up into a new
                    312:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    313:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   314:         * IPv6 header is in the first mbuf of the chain.
                    315:         */
1.97      christos  316:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   317:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    318:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    319:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    320:                        /* XXXJRT new stat, please */
1.116     thorpej   321:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.57      thorpej   322:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    323:                        return;
                    324:                }
                    325:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    326:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    327:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116     thorpej   328:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.9       itojun    329:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    330:                        return;
                    331:                }
1.2       itojun    332:        }
                    333:
                    334:        ip6 = mtod(m, struct ip6_hdr *);
                    335:
                    336:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116     thorpej   337:                IP6_STATINC(IP6_STAT_BADVERS);
1.9       itojun    338:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    339:                goto bad;
                    340:        }
1.15      darrenr   341:
1.98      liamjfoy  342:        /*
                    343:         * Assume that we can create a fast-forward IP flow entry
                    344:         * based on this packet.
                    345:         */
                    346:        m->m_flags |= M_CANFASTFWD;
                    347:
1.15      darrenr   348: #ifdef PFIL_HOOKS
                    349:        /*
                    350:         * Run through list of hooks for input packets.  If there are any
                    351:         * filters which require that additional packets in the flow are
                    352:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    353:         * Note that filters must _never_ set this flag, as another filter
                    354:         * in the list may have previously cleared it.
                    355:         */
1.39      itojun    356:        /*
                    357:         * let ipfilter look at packet on the wire,
                    358:         * not the decapsulated packet.
                    359:         */
1.142   ! christos  360: #if defined(IPSEC)
1.94      degroote  361:        if (!ipsec_indone(m))
1.39      itojun    362: #else
                    363:        if (1)
                    364: #endif
                    365:        {
1.64      itojun    366:                struct in6_addr odst;
                    367:
                    368:                odst = ip6->ip6_dst;
1.39      itojun    369:                if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    370:                                   PFIL_IN) != 0)
                    371:                        return;
                    372:                if (m == NULL)
                    373:                        return;
                    374:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    375:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    376:        }
1.15      darrenr   377: #endif /* PFIL_HOOKS */
                    378:
1.116     thorpej   379:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    380:
1.30      thorpej   381: #ifdef ALTQ
                    382:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    383:                /* packet is dropped by traffic conditioner */
                    384:                return;
1.9       itojun    385:        }
                    386: #endif
                    387:
1.2       itojun    388:        /*
1.44      itojun    389:         * Check against address spoofing/corruption.
1.2       itojun    390:         */
                    391:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    392:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    393:                /*
                    394:                 * XXX: "badscope" is not very suitable for a multicast source.
                    395:                 */
1.116     thorpej   396:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.9       itojun    397:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    398:                goto bad;
                    399:        }
1.13      itojun    400:        /*
1.44      itojun    401:         * The following check is not documented in specs.  A malicious
                    402:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    403:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    404:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    405:         *
1.44      itojun    406:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    407:         * support IPv4-less kernel compilation, we cannot support SIIT
                    408:         * environment at all.  So, it makes more sense for us to reject any
                    409:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       410:         * partial support for SIIT environment.
1.13      itojun    411:         */
                    412:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    413:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   414:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    415:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    416:                goto bad;
                    417:        }
1.17      itojun    418: #if 0
1.13      itojun    419:        /*
1.17      itojun    420:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    421:         *
                    422:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    423:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    424:         * is revised to forbid relaying case.
1.13      itojun    425:         */
                    426:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    427:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116     thorpej   428:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    429:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    430:                goto bad;
                    431:        }
                    432: #endif
1.35      itojun    433:
1.2       itojun    434:        /*
1.82      yamt      435:         * Disambiguate address scope zones (if there is ambiguity).
                    436:         * We first make sure that the original source or destination address
                    437:         * is not in our internal form for scoped addresses.  Such addresses
                    438:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    439:         * to the usage conflict.
                    440:         * in6_setscope() then also checks and rejects the cases where src or
                    441:         * dst are the loopback address and the receiving interface
                    442:         * is not loopback.
                    443:         */
1.88      bouyer    444:        if (__predict_false(
                    445:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    446:                goto bad;
                    447:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      448:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116     thorpej   449:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      450:                goto bad;
                    451:        }
                    452:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    453:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116     thorpej   454:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      455:                goto bad;
                    456:        }
                    457:
                    458:        /*
1.2       itojun    459:         * Multicast check
                    460:         */
                    461:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    462:                struct  in6_multi *in6m = 0;
1.9       itojun    463:
                    464:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    465:                /*
                    466:                 * See if we belong to the destination multicast group on the
                    467:                 * arrival interface.
                    468:                 */
                    469:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    470:                if (in6m)
                    471:                        ours = 1;
                    472:                else if (!ip6_mrouter) {
1.116     thorpej   473:                        uint64_t *ip6s = IP6_STAT_GETREF();
                    474:                        ip6s[IP6_STAT_NOTMEMBER]++;
                    475:                        ip6s[IP6_STAT_CANTFORWARD]++;
                    476:                        IP6_STAT_PUTREF();
1.9       itojun    477:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    478:                        goto bad;
                    479:                }
1.9       itojun    480:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    481:                goto hbhcheck;
                    482:        }
                    483:
1.105     dyoung    484:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    485:
1.2       itojun    486:        /*
                    487:         *  Unicast check
                    488:         */
1.105     dyoung    489:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
                    490:        if (hit)
1.116     thorpej   491:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     492:        else
1.116     thorpej   493:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    494:
1.109     dyoung    495: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2       itojun    496:
                    497:        /*
                    498:         * Accept the packet if the forwarding interface to the destination
                    499:         * according to the routing table is the loopback interface,
                    500:         * unless the associated route has a gateway.
                    501:         * Note that this approach causes to accept a packet if there is a
                    502:         * route to the loopback interface for the destination of the packet.
                    503:         * But we think it's even useful in some situations, e.g. when using
                    504:         * a special daemon which wants to intercept the packet.
                    505:         */
1.105     dyoung    506:        if (rt != NULL &&
                    507:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    508:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    509: #if 0
                    510:            /*
                    511:             * The check below is redundant since the comparison of
                    512:             * the destination and the key of the rtentry has
                    513:             * already done through looking up the routing table.
                    514:             */
1.109     dyoung    515:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2       itojun    516: #endif
1.105     dyoung    517:            rt->rt_ifp->if_type == IFT_LOOP) {
                    518:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    519:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    520:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    521:                /*
                    522:                 * packets to a tentative, duplicated, or somehow invalid
                    523:                 * address must not be accepted.
                    524:                 */
1.2       itojun    525:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    526:                        /* this address is ready */
1.2       itojun    527:                        ours = 1;
1.9       itojun    528:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    529:                        goto hbhcheck;
                    530:                } else {
1.24      itojun    531:                        /* address is not ready, so discard the packet. */
1.34      itojun    532:                        nd6log((LOG_INFO,
1.27      itojun    533:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    534:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    535:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    536:
                    537:                        goto bad;
1.2       itojun    538:                }
                    539:        }
                    540:
                    541:        /*
1.55      itojun    542:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    543:         */
                    544: #if defined(NFAITH) && 0 < NFAITH
                    545:        if (ip6_keepfaith) {
1.105     dyoung    546:                if (rt != NULL && rt->rt_ifp != NULL &&
                    547:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    548:                        /* XXX do we need more sanity checks? */
                    549:                        ours = 1;
1.105     dyoung    550:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    551:                        goto hbhcheck;
                    552:                }
                    553:        }
                    554: #endif
                    555:
                    556: #if 0
                    557:     {
                    558:        /*
                    559:         * Last resort: check in6_ifaddr for incoming interface.
                    560:         * The code is here until I update the "goto ours hack" code above
                    561:         * working right.
                    562:         */
                    563:        struct ifaddr *ifa;
1.113     dyoung    564:        IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9       itojun    565:                if (ifa->ifa_addr == NULL)
                    566:                        continue;       /* just for safety */
                    567:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    568:                        continue;
                    569:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    570:                        ours = 1;
                    571:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    572:                        goto hbhcheck;
                    573:                }
                    574:        }
1.9       itojun    575:     }
1.2       itojun    576: #endif
                    577:
                    578:        /*
                    579:         * Now there is no reason to process the packet if it's not our own
                    580:         * and we're not a router.
                    581:         */
                    582:        if (!ip6_forwarding) {
1.116     thorpej   583:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9       itojun    584:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    585:                goto bad;
                    586:        }
                    587:
                    588:   hbhcheck:
                    589:        /*
1.81      rpaulo    590:         * record address information into m_tag, if we don't have one yet.
                    591:         * note that we are unable to record it, if the address is not listed
                    592:         * as our interface address (e.g. multicast addresses, addresses
                    593:         * within FAITH prefixes and such).
                    594:         */
1.111     dyoung    595:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    596:                struct in6_ifaddr *ia6;
                    597:
                    598:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111     dyoung    599:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    600:                        /*
                    601:                         * XXX maybe we should drop the packet here,
                    602:                         * as we could not provide enough information
                    603:                         * to the upper layers.
                    604:                         */
1.81      rpaulo    605:                }
                    606:        }
                    607:
                    608:        /*
1.2       itojun    609:         * Process Hop-by-Hop options header if it's contained.
                    610:         * m may be modified in ip6_hopopts_input().
                    611:         * If a JumboPayload option is included, plen will also be modified.
                    612:         */
                    613:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    614:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    615:                struct ip6_hbh *hbh;
                    616:
                    617:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    618: #if 0  /*touches NULL pointer*/
                    619:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    620: #endif
1.2       itojun    621:                        return; /* m have already been freed */
1.9       itojun    622:                }
1.22      itojun    623:
1.2       itojun    624:                /* adjust pointer */
                    625:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    626:
                    627:                /*
1.49      itojun    628:                 * if the payload length field is 0 and the next header field
1.22      itojun    629:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    630:                 * option MUST be included.
                    631:                 */
                    632:                if (ip6->ip6_plen == 0 && plen == 0) {
                    633:                        /*
                    634:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    635:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    636:                         * (non-zero) payload length to the variable plen.
1.22      itojun    637:                         */
1.116     thorpej   638:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    639:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    640:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    641:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    642:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  643:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    644:                        return;
                    645:                }
1.9       itojun    646:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    647:                        sizeof(struct ip6_hbh));
                    648:                if (hbh == NULL) {
1.116     thorpej   649:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    650:                        return;
                    651:                }
1.57      thorpej   652:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    653:                nxt = hbh->ip6h_nxt;
1.2       itojun    654:
                    655:                /*
                    656:                 * accept the packet if a router alert option is included
                    657:                 * and we act as an IPv6 router.
                    658:                 */
1.5       itojun    659:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    660:                        ours = 1;
                    661:        } else
                    662:                nxt = ip6->ip6_nxt;
                    663:
                    664:        /*
                    665:         * Check that the amount of data in the buffers
                    666:         * is as at least much as the IPv6 header would have us expect.
                    667:         * Trim mbufs if longer than we expect.
                    668:         * Drop packet if shorter than we expect.
                    669:         */
                    670:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116     thorpej   671:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    672:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    673:                goto bad;
                    674:        }
                    675:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    676:                if (m->m_len == m->m_pkthdr.len) {
                    677:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    678:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    679:                } else
                    680:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    681:        }
                    682:
                    683:        /*
                    684:         * Forward if desirable.
                    685:         */
                    686:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    687:                /*
                    688:                 * If we are acting as a multicast router, all
                    689:                 * incoming multicast packets are passed to the
                    690:                 * kernel-level multicast forwarding function.
                    691:                 * The packet is returned (relatively) intact; if
                    692:                 * ip6_mforward() returns a non-zero value, the packet
                    693:                 * must be discarded, else it may be accepted below.
                    694:                 */
                    695:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116     thorpej   696:                        IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2       itojun    697:                        m_freem(m);
                    698:                        return;
                    699:                }
                    700:                if (!ours) {
                    701:                        m_freem(m);
                    702:                        return;
                    703:                }
1.22      itojun    704:        } else if (!ours) {
1.64      itojun    705:                ip6_forward(m, srcrt);
1.2       itojun    706:                return;
1.56      itojun    707:        }
1.25      itojun    708:
                    709:        ip6 = mtod(m, struct ip6_hdr *);
                    710:
                    711:        /*
                    712:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    713:         * tcp/udp stack and bypass security checks (act as if it was from
                    714:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    715:         *
                    716:         * For SIIT end node behavior, you may want to disable the check.
                    717:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    718:         * source.
                    719:         */
                    720:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    721:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   722:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.25      itojun    723:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    724:                goto bad;
                    725:        }
1.2       itojun    726:
                    727:        /*
                    728:         * Tell launch routine the next header
                    729:         */
1.12      itojun    730: #ifdef IFA_STATS
1.28      itojun    731:        if (deliverifp != NULL) {
1.9       itojun    732:                struct in6_ifaddr *ia6;
                    733:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    734:                if (ia6)
                    735:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    736:        }
                    737: #endif
1.116     thorpej   738:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    739:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    740:        nest = 0;
1.40      itojun    741:
1.104     yamt      742:        rh_present = 0;
1.2       itojun    743:        while (nxt != IPPROTO_DONE) {
                    744:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116     thorpej   745:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104     yamt      746:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    747:                        goto bad;
                    748:                }
1.8       itojun    749:
                    750:                /*
                    751:                 * protection against faulty packet - there should be
                    752:                 * more sanity checks in header chain processing.
                    753:                 */
                    754:                if (m->m_pkthdr.len < off) {
1.116     thorpej   755:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    756:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    757:                        goto bad;
                    758:                }
                    759:
1.104     yamt      760:                if (nxt == IPPROTO_ROUTING) {
                    761:                        if (rh_present++) {
                    762:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
                    763:                                    ifs6_in_hdrerr);
1.116     thorpej   764:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      765:                                goto bad;
                    766:                        }
                    767:                }
                    768:
1.142   ! christos  769: #ifdef IPSEC
1.94      degroote  770:        /*
                    771:         * enforce IPsec policy checking if we are seeing last header.
                    772:         * note that we do not visit this with protocols with pcb layer
                    773:         * code - like udp/tcp/raw ip.
                    774:         */
                    775:        if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
                    776:                /*
                    777:                 * Check if the packet has already had IPsec processing
                    778:                 * done.  If so, then just pass it along.  This tag gets
                    779:                 * set during AH, ESP, etc. input handling, before the
                    780:                 * packet is returned to the ip input queue for delivery.
                    781:                 */
                    782:                mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
                    783:                s = splsoftnet();
                    784:                if (mtag != NULL) {
                    785:                        tdbi = (struct tdb_ident *)(mtag + 1);
                    786:                        sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
                    787:                } else {
                    788:                        sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
                    789:                                                                        IP_FORWARDING, &error);
                    790:                }
                    791:                if (sp != NULL) {
                    792:                        /*
                    793:                         * Check security policy against packet attributes.
                    794:                         */
                    795:                        error = ipsec_in_reject(sp, m);
                    796:                        KEY_FREESP(&sp);
                    797:                } else {
                    798:                        /* XXX error stat??? */
                    799:                        error = EINVAL;
                    800:                        DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
                    801:                }
                    802:                splx(s);
                    803:                if (error)
                    804:                        goto bad;
                    805:        }
1.142   ! christos  806: #endif /* IPSEC */
1.94      degroote  807:
1.56      itojun    808:
1.2       itojun    809:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    810:        }
                    811:        return;
                    812:  bad:
                    813:        m_freem(m);
                    814: }
                    815:
                    816: /*
1.81      rpaulo    817:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    818:  */
                    819: static struct m_tag *
1.112     dyoung    820: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    821: {
                    822:        struct m_tag *mtag;
                    823:
                    824:        mtag = ip6_addaux(m);
1.112     dyoung    825:        if (mtag != NULL) {
                    826:                struct ip6aux *ip6a;
                    827:
                    828:                ip6a = (struct ip6aux *)(mtag + 1);
                    829:                in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
                    830:                ip6a->ip6a_src = ia->ia_addr.sin6_addr;
                    831:                ip6a->ip6a_flags = ia->ia6_flags;
                    832:        }
1.81      rpaulo    833:        return mtag;    /* NULL if failed to set */
                    834: }
                    835:
1.112     dyoung    836: const struct ip6aux *
1.107     christos  837: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    838: {
                    839:        struct m_tag *mtag;
                    840:
                    841:        mtag = ip6_findaux(m);
1.112     dyoung    842:        if (mtag != NULL)
                    843:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    844:        else
                    845:                return NULL;
                    846: }
                    847:
                    848: /*
1.2       itojun    849:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    850:  * included, the real payload length will be stored in plenp.
1.107     christos  851:  *
                    852:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    853:  */
1.136     drochner  854: int
1.107     christos  855: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
                    856:        struct mbuf **mp, int *offp)
1.2       itojun    857: {
1.35      itojun    858:        struct mbuf *m = *mp;
1.2       itojun    859:        int off = *offp, hbhlen;
                    860:        struct ip6_hbh *hbh;
                    861:
                    862:        /* validation of the length of the header */
1.9       itojun    863:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    864:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    865:        if (hbh == NULL) {
1.116     thorpej   866:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    867:                return -1;
                    868:        }
                    869:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    870:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    871:                hbhlen);
                    872:        if (hbh == NULL) {
1.116     thorpej   873:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    874:                return -1;
                    875:        }
1.57      thorpej   876:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    877:        off += hbhlen;
                    878:        hbhlen -= sizeof(struct ip6_hbh);
                    879:
                    880:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    881:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    882:                return (-1);
1.2       itojun    883:
                    884:        *offp = off;
                    885:        *mp = m;
1.58      itojun    886:        return (0);
1.2       itojun    887: }
                    888:
                    889: /*
                    890:  * Search header for all Hop-by-hop options and process each option.
                    891:  * This function is separate from ip6_hopopts_input() in order to
                    892:  * handle a case where the sending node itself process its hop-by-hop
                    893:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    894:  *
                    895:  * The function assumes that hbh header is located right after the IPv6 header
                    896:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    897:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    898:  */
1.136     drochner  899: static int
1.107     christos  900: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
                    901:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    902: {
                    903:        struct ip6_hdr *ip6;
                    904:        int optlen = 0;
                    905:        u_int8_t *opt = opthead;
                    906:        u_int16_t rtalert_val;
1.22      itojun    907:        u_int32_t jumboplen;
1.55      itojun    908:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    909:
                    910:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    911:                switch (*opt) {
                    912:                case IP6OPT_PAD1:
                    913:                        optlen = 1;
                    914:                        break;
                    915:                case IP6OPT_PADN:
                    916:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   917:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    918:                                goto bad;
                    919:                        }
                    920:                        optlen = *(opt + 1) + 2;
                    921:                        break;
                    922:                case IP6OPT_RTALERT:
                    923:                        /* XXX may need check for alignment */
                    924:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116     thorpej   925:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    926:                                goto bad;
                    927:                        }
                    928:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    929:                                /* XXX stat */
                    930:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    931:                                    ICMP6_PARAMPROB_HEADER,
                    932:                                    erroff + opt + 1 - opthead);
                    933:                                return (-1);
1.35      itojun    934:                        }
                    935:                        optlen = IP6OPT_RTALERT_LEN;
1.126     tsutsui   936:                        memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35      itojun    937:                        *rtalertp = ntohs(rtalert_val);
                    938:                        break;
                    939:                case IP6OPT_JUMBO:
1.22      itojun    940:                        /* XXX may need check for alignment */
                    941:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116     thorpej   942:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    943:                                goto bad;
                    944:                        }
1.35      itojun    945:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    946:                                /* XXX stat */
                    947:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    948:                                    ICMP6_PARAMPROB_HEADER,
                    949:                                    erroff + opt + 1 - opthead);
                    950:                                return (-1);
1.35      itojun    951:                        }
1.22      itojun    952:                        optlen = IP6OPT_JUMBO_LEN;
                    953:
                    954:                        /*
                    955:                         * IPv6 packets that have non 0 payload length
1.35      itojun    956:                         * must not contain a jumbo payload option.
1.22      itojun    957:                         */
                    958:                        ip6 = mtod(m, struct ip6_hdr *);
                    959:                        if (ip6->ip6_plen) {
1.116     thorpej   960:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    961:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    962:                                    ICMP6_PARAMPROB_HEADER,
                    963:                                    erroff + opt - opthead);
                    964:                                return (-1);
1.22      itojun    965:                        }
1.2       itojun    966:
1.22      itojun    967:                        /*
                    968:                         * We may see jumbolen in unaligned location, so
                    969:                         * we'd need to perform bcopy().
                    970:                         */
1.126     tsutsui   971:                        memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22      itojun    972:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    973:
                    974: #if 1
                    975:                        /*
                    976:                         * if there are multiple jumbo payload options,
                    977:                         * *plenp will be non-zero and the packet will be
                    978:                         * rejected.
                    979:                         * the behavior may need some debate in ipngwg -
                    980:                         * multiple options does not make sense, however,
                    981:                         * there's no explicit mention in specification.
                    982:                         */
                    983:                        if (*plenp != 0) {
1.116     thorpej   984:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    985:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    986:                                    ICMP6_PARAMPROB_HEADER,
                    987:                                    erroff + opt + 2 - opthead);
                    988:                                return (-1);
1.22      itojun    989:                        }
1.8       itojun    990: #endif
1.2       itojun    991:
1.22      itojun    992:                        /*
                    993:                         * jumbo payload length must be larger than 65535.
                    994:                         */
                    995:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116     thorpej   996:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    997:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    998:                                    ICMP6_PARAMPROB_HEADER,
                    999:                                    erroff + opt + 2 - opthead);
                   1000:                                return (-1);
1.22      itojun   1001:                        }
                   1002:                        *plenp = jumboplen;
                   1003:
                   1004:                        break;
1.35      itojun   1005:                default:                /* unknown option */
                   1006:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej  1007:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun   1008:                                goto bad;
                   1009:                        }
1.55      itojun   1010:                        optlen = ip6_unknown_opt(opt, m,
                   1011:                            erroff + opt - opthead);
                   1012:                        if (optlen == -1)
                   1013:                                return (-1);
1.35      itojun   1014:                        optlen += 2;
                   1015:                        break;
1.2       itojun   1016:                }
                   1017:        }
                   1018:
1.55      itojun   1019:        return (0);
1.2       itojun   1020:
                   1021:   bad:
                   1022:        m_freem(m);
1.55      itojun   1023:        return (-1);
1.2       itojun   1024: }
                   1025:
                   1026: /*
                   1027:  * Unknown option processing.
                   1028:  * The third argument `off' is the offset from the IPv6 header to the option,
                   1029:  * which is necessary if the IPv6 header the and option header and IPv6 header
                   1030:  * is not continuous in order to return an ICMPv6 error.
                   1031:  */
                   1032: int
1.107     christos 1033: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun   1034: {
                   1035:        struct ip6_hdr *ip6;
                   1036:
1.35      itojun   1037:        switch (IP6OPT_TYPE(*optp)) {
                   1038:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1039:                return ((int)*(optp + 1));
1.35      itojun   1040:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1041:                m_freem(m);
1.58      itojun   1042:                return (-1);
1.35      itojun   1043:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116     thorpej  1044:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1045:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1046:                return (-1);
1.35      itojun   1047:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116     thorpej  1048:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1049:                ip6 = mtod(m, struct ip6_hdr *);
                   1050:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1051:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1052:                        m_freem(m);
                   1053:                else
                   1054:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1055:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1056:                return (-1);
1.2       itojun   1057:        }
                   1058:
                   1059:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1060:        return (-1);
1.2       itojun   1061: }
                   1062:
                   1063: /*
1.9       itojun   1064:  * Create the "control" list for this pcb.
                   1065:  *
                   1066:  * The routine will be called from upper layer handlers like tcp6_input().
                   1067:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1068:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1069:  * very first mbuf on the mbuf chain.
                   1070:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1071:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1072:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1073:  */
                   1074: void
1.107     christos 1075: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
                   1076:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1077: {
1.85      rpaulo   1078: #ifdef RFC2292
                   1079: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1080: #else
                   1081: #define IS2292(x, y)   (y)
                   1082: #endif
                   1083:
1.123     christos 1084:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP
                   1085: #ifdef SO_OTIMESTAMP
                   1086:            || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                   1087: #endif
                   1088:        ) {
1.2       itojun   1089:                struct timeval tv;
                   1090:
                   1091:                microtime(&tv);
1.123     christos 1092: #ifdef SO_OTIMESTAMP
                   1093:                if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
                   1094:                        struct timeval50 tv50;
                   1095:                        timeval_to_timeval50(&tv, &tv50);
                   1096:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1097:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1098:                } else
                   1099: #endif
1.97      christos 1100:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1101:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1102:                if (*mp)
                   1103:                        mp = &(*mp)->m_next;
                   1104:        }
1.87      rpaulo   1105:
                   1106:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1107:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1108:                return;
                   1109:
1.2       itojun   1110:        /* RFC 2292 sec. 5 */
1.35      itojun   1111:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1112:                struct in6_pktinfo pi6;
1.85      rpaulo   1113:
1.126     tsutsui  1114:                memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81      rpaulo   1115:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1116:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1117:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1118:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1119:                    sizeof(struct in6_pktinfo),
                   1120:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1121:                if (*mp)
                   1122:                        mp = &(*mp)->m_next;
                   1123:        }
1.85      rpaulo   1124:
1.2       itojun   1125:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1126:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1127:
1.97      christos 1128:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1129:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1130:                if (*mp)
                   1131:                        mp = &(*mp)->m_next;
                   1132:        }
                   1133:
                   1134:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1135:                u_int32_t flowinfo;
                   1136:                int tclass;
                   1137:
                   1138:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1139:                flowinfo >>= 20;
                   1140:
                   1141:                tclass = flowinfo & 0xff;
1.97      christos 1142:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1143:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1144:
1.2       itojun   1145:                if (*mp)
                   1146:                        mp = &(*mp)->m_next;
                   1147:        }
                   1148:
                   1149:        /*
1.75      itojun   1150:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1151:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1152:         * strict, since there might be some hop-by-hop options which can be
                   1153:         * returned to normal user.
1.85      rpaulo   1154:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1155:         */
1.75      itojun   1156:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1157:                /*
                   1158:                 * Check if a hop-by-hop options header is contatined in the
                   1159:                 * received packet, and if so, store the options as ancillary
                   1160:                 * data. Note that a hop-by-hop options header must be
                   1161:                 * just after the IPv6 header, which fact is assured through
                   1162:                 * the IPv6 input processing.
                   1163:                 */
1.78      christos 1164:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1165:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1166:                        struct ip6_hbh *hbh;
                   1167:                        int hbhlen;
1.62      itojun   1168:                        struct mbuf *ext;
1.9       itojun   1169:
1.62      itojun   1170:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1171:                            xip6->ip6_nxt);
1.62      itojun   1172:                        if (ext == NULL) {
1.116     thorpej  1173:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1174:                                return;
                   1175:                        }
1.62      itojun   1176:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1177:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1178:                        if (hbhlen != ext->m_len) {
                   1179:                                m_freem(ext);
1.116     thorpej  1180:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1181:                                return;
                   1182:                        }
1.2       itojun   1183:
                   1184:                        /*
                   1185:                         * XXX: We copy whole the header even if a jumbo
                   1186:                         * payload option is included, which option is to
                   1187:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1188:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1189:                         */
1.97      christos 1190:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1191:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1192:                            IPPROTO_IPV6);
1.2       itojun   1193:                        if (*mp)
                   1194:                                mp = &(*mp)->m_next;
1.62      itojun   1195:                        m_freem(ext);
1.2       itojun   1196:                }
                   1197:        }
                   1198:
                   1199:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1200:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1201:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1202:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1203:
                   1204:                /*
                   1205:                 * Search for destination options headers or routing
                   1206:                 * header(s) through the header chain, and stores each
                   1207:                 * header as ancillary data.
                   1208:                 * Note that the order of the headers remains in
                   1209:                 * the chain of ancillary data.
                   1210:                 */
1.86      rpaulo   1211:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1212:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1213:                        int elen;
1.62      itojun   1214:                        struct mbuf *ext = NULL;
1.9       itojun   1215:
1.62      itojun   1216:                        /*
                   1217:                         * if it is not an extension header, don't try to
                   1218:                         * pull it from the chain.
                   1219:                         */
                   1220:                        switch (nxt) {
                   1221:                        case IPPROTO_DSTOPTS:
                   1222:                        case IPPROTO_ROUTING:
                   1223:                        case IPPROTO_HOPOPTS:
                   1224:                        case IPPROTO_AH: /* is it possible? */
                   1225:                                break;
                   1226:                        default:
                   1227:                                goto loopend;
                   1228:                        }
                   1229:
                   1230:                        ext = ip6_pullexthdr(m, off, nxt);
                   1231:                        if (ext == NULL) {
1.116     thorpej  1232:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1233:                                return;
                   1234:                        }
1.62      itojun   1235:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1236:                        if (nxt == IPPROTO_AH)
                   1237:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1238:                        else
                   1239:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1240:                        if (elen != ext->m_len) {
                   1241:                                m_freem(ext);
1.116     thorpej  1242:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1243:                                return;
                   1244:                        }
1.57      thorpej  1245:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1246:
1.35      itojun   1247:                        switch (nxt) {
1.62      itojun   1248:                        case IPPROTO_DSTOPTS:
1.127     martin   1249:                                if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35      itojun   1250:                                        break;
                   1251:
1.97      christos 1252:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1253:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1254:                                    IPPROTO_IPV6);
1.35      itojun   1255:                                if (*mp)
                   1256:                                        mp = &(*mp)->m_next;
                   1257:                                break;
                   1258:
                   1259:                        case IPPROTO_ROUTING:
1.127     martin   1260:                                if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35      itojun   1261:                                        break;
                   1262:
1.97      christos 1263:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1264:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1265:                                    IPPROTO_IPV6);
1.35      itojun   1266:                                if (*mp)
                   1267:                                        mp = &(*mp)->m_next;
                   1268:                                break;
                   1269:
1.62      itojun   1270:                        case IPPROTO_HOPOPTS:
                   1271:                        case IPPROTO_AH: /* is it possible? */
                   1272:                                break;
                   1273:
1.35      itojun   1274:                        default:
                   1275:                                /*
1.62      itojun   1276:                                 * other cases have been filtered in the above.
                   1277:                                 * none will visit this case.  here we supply
                   1278:                                 * the code just in case (nxt overwritten or
                   1279:                                 * other cases).
1.35      itojun   1280:                                 */
1.62      itojun   1281:                                m_freem(ext);
1.35      itojun   1282:                                goto loopend;
                   1283:
1.2       itojun   1284:                        }
                   1285:
                   1286:                        /* proceed with the next header. */
1.9       itojun   1287:                        off += elen;
1.2       itojun   1288:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1289:                        ip6e = NULL;
                   1290:                        m_freem(ext);
                   1291:                        ext = NULL;
1.2       itojun   1292:                }
                   1293:          loopend:
1.62      itojun   1294:                ;
1.2       itojun   1295:        }
1.62      itojun   1296: }
1.85      rpaulo   1297: #undef IS2292
                   1298:
                   1299:
                   1300: void
1.95      dyoung   1301: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1302:     uint32_t *mtu)
1.85      rpaulo   1303: {
                   1304:        struct socket *so;
                   1305:        struct mbuf *m_mtu;
                   1306:        struct ip6_mtuinfo mtuctl;
                   1307:
                   1308:        so = in6p->in6p_socket;
                   1309:
                   1310:        if (mtu == NULL)
                   1311:                return;
                   1312:
                   1313: #ifdef DIAGNOSTIC
                   1314:        if (so == NULL)         /* I believe this is impossible */
                   1315:                panic("ip6_notify_pmtu: socket is NULL");
                   1316: #endif
                   1317:
                   1318:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1319:        mtuctl.ip6m_mtu = *mtu;
                   1320:        mtuctl.ip6m_addr = *dst;
                   1321:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1322:                return;
                   1323:
1.97      christos 1324:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1325:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1326:                return;
                   1327:
1.95      dyoung   1328:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1329:            == 0) {
                   1330:                m_freem(m_mtu);
                   1331:                /* XXX: should count statistics */
                   1332:        } else
                   1333:                sorwakeup(so);
                   1334:
                   1335:        return;
                   1336: }
1.62      itojun   1337:
                   1338: /*
                   1339:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1340:  * contains the result, or NULL on error.
                   1341:  */
                   1342: static struct mbuf *
1.107     christos 1343: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1344: {
                   1345:        struct ip6_ext ip6e;
                   1346:        size_t elen;
                   1347:        struct mbuf *n;
                   1348:
                   1349: #ifdef DIAGNOSTIC
                   1350:        switch (nxt) {
                   1351:        case IPPROTO_DSTOPTS:
                   1352:        case IPPROTO_ROUTING:
                   1353:        case IPPROTO_HOPOPTS:
                   1354:        case IPPROTO_AH: /* is it possible? */
                   1355:                break;
                   1356:        default:
                   1357:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1358:        }
1.62      itojun   1359: #endif
1.2       itojun   1360:
1.97      christos 1361:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1362:        if (nxt == IPPROTO_AH)
                   1363:                elen = (ip6e.ip6e_len + 2) << 2;
                   1364:        else
                   1365:                elen = (ip6e.ip6e_len + 1) << 3;
                   1366:
                   1367:        MGET(n, M_DONTWAIT, MT_DATA);
                   1368:        if (n && elen >= MLEN) {
                   1369:                MCLGET(n, M_DONTWAIT);
                   1370:                if ((n->m_flags & M_EXT) == 0) {
                   1371:                        m_free(n);
                   1372:                        n = NULL;
                   1373:                }
                   1374:        }
                   1375:        if (!n)
                   1376:                return NULL;
                   1377:
                   1378:        n->m_len = 0;
                   1379:        if (elen >= M_TRAILINGSPACE(n)) {
                   1380:                m_free(n);
                   1381:                return NULL;
                   1382:        }
                   1383:
1.97      christos 1384:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1385:        n->m_len = elen;
                   1386:        return n;
1.2       itojun   1387: }
                   1388:
                   1389: /*
                   1390:  * Get pointer to the previous header followed by the header
                   1391:  * currently processed.
                   1392:  * XXX: This function supposes that
                   1393:  *     M includes all headers,
                   1394:  *     the next header field and the header length field of each header
                   1395:  *     are valid, and
                   1396:  *     the sum of each header length equals to OFF.
                   1397:  * Because of these assumptions, this function must be called very
                   1398:  * carefully. Moreover, it will not be used in the near future when
                   1399:  * we develop `neater' mechanism to process extension headers.
                   1400:  */
1.58      itojun   1401: u_int8_t *
1.107     christos 1402: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1403: {
                   1404:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1405:
                   1406:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1407:                return (&ip6->ip6_nxt);
1.2       itojun   1408:        else {
                   1409:                int len, nxt;
                   1410:                struct ip6_ext *ip6e = NULL;
                   1411:
                   1412:                nxt = ip6->ip6_nxt;
                   1413:                len = sizeof(struct ip6_hdr);
                   1414:                while (len < off) {
1.97      christos 1415:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1416:
1.35      itojun   1417:                        switch (nxt) {
1.2       itojun   1418:                        case IPPROTO_FRAGMENT:
                   1419:                                len += sizeof(struct ip6_frag);
                   1420:                                break;
                   1421:                        case IPPROTO_AH:
                   1422:                                len += (ip6e->ip6e_len + 2) << 2;
                   1423:                                break;
                   1424:                        default:
                   1425:                                len += (ip6e->ip6e_len + 1) << 3;
                   1426:                                break;
                   1427:                        }
                   1428:                        nxt = ip6e->ip6e_nxt;
                   1429:                }
                   1430:                if (ip6e)
1.58      itojun   1431:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1432:                else
                   1433:                        return NULL;
1.18      itojun   1434:        }
                   1435: }
                   1436:
                   1437: /*
                   1438:  * get next header offset.  m will be retained.
                   1439:  */
                   1440: int
1.107     christos 1441: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1442: {
                   1443:        struct ip6_hdr ip6;
                   1444:        struct ip6_ext ip6e;
                   1445:        struct ip6_frag fh;
                   1446:
                   1447:        /* just in case */
                   1448:        if (m == NULL)
                   1449:                panic("ip6_nexthdr: m == NULL");
                   1450:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1451:                return -1;
                   1452:
                   1453:        switch (proto) {
                   1454:        case IPPROTO_IPV6:
1.83      rpaulo   1455:                /* do not chase beyond intermediate IPv6 headers */
                   1456:                if (off != 0)
                   1457:                        return -1;
1.18      itojun   1458:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1459:                        return -1;
1.97      christos 1460:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1461:                if (nxtp)
                   1462:                        *nxtp = ip6.ip6_nxt;
                   1463:                off += sizeof(ip6);
                   1464:                return off;
                   1465:
                   1466:        case IPPROTO_FRAGMENT:
                   1467:                /*
                   1468:                 * terminate parsing if it is not the first fragment,
                   1469:                 * it does not make sense to parse through it.
                   1470:                 */
                   1471:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1472:                        return -1;
1.97      christos 1473:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1474:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1475:                        return -1;
                   1476:                if (nxtp)
                   1477:                        *nxtp = fh.ip6f_nxt;
                   1478:                off += sizeof(struct ip6_frag);
                   1479:                return off;
                   1480:
                   1481:        case IPPROTO_AH:
                   1482:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1483:                        return -1;
1.97      christos 1484:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1485:                if (nxtp)
                   1486:                        *nxtp = ip6e.ip6e_nxt;
                   1487:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1488:                if (m->m_pkthdr.len < off)
                   1489:                        return -1;
1.18      itojun   1490:                return off;
                   1491:
                   1492:        case IPPROTO_HOPOPTS:
                   1493:        case IPPROTO_ROUTING:
                   1494:        case IPPROTO_DSTOPTS:
                   1495:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1496:                        return -1;
1.97      christos 1497:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1498:                if (nxtp)
                   1499:                        *nxtp = ip6e.ip6e_nxt;
                   1500:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1501:                if (m->m_pkthdr.len < off)
                   1502:                        return -1;
1.18      itojun   1503:                return off;
                   1504:
                   1505:        case IPPROTO_NONE:
                   1506:        case IPPROTO_ESP:
                   1507:        case IPPROTO_IPCOMP:
                   1508:                /* give up */
                   1509:                return -1;
                   1510:
                   1511:        default:
                   1512:                return -1;
                   1513:        }
                   1514: }
                   1515:
                   1516: /*
                   1517:  * get offset for the last header in the chain.  m will be kept untainted.
                   1518:  */
                   1519: int
1.107     christos 1520: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1521: {
                   1522:        int newoff;
                   1523:        int nxt;
                   1524:
                   1525:        if (!nxtp) {
                   1526:                nxt = -1;
                   1527:                nxtp = &nxt;
                   1528:        }
1.86      rpaulo   1529:        for (;;) {
1.18      itojun   1530:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1531:                if (newoff < 0)
                   1532:                        return off;
                   1533:                else if (newoff < off)
                   1534:                        return -1;      /* invalid */
                   1535:                else if (newoff == off)
                   1536:                        return newoff;
                   1537:
                   1538:                off = newoff;
                   1539:                proto = *nxtp;
1.2       itojun   1540:        }
                   1541: }
                   1542:
1.81      rpaulo   1543: struct m_tag *
1.107     christos 1544: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1545: {
                   1546:        struct m_tag *mtag;
                   1547:
                   1548:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1549:        if (!mtag) {
                   1550:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1551:                    M_NOWAIT);
                   1552:                if (mtag) {
                   1553:                        m_tag_prepend(m, mtag);
1.124     cegger   1554:                        memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81      rpaulo   1555:                }
                   1556:        }
                   1557:        return mtag;
                   1558: }
                   1559:
                   1560: struct m_tag *
1.107     christos 1561: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1562: {
                   1563:        struct m_tag *mtag;
                   1564:
                   1565:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1566:        return mtag;
                   1567: }
                   1568:
                   1569: void
1.107     christos 1570: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1571: {
                   1572:        struct m_tag *mtag;
                   1573:
                   1574:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1575:        if (mtag)
                   1576:                m_tag_delete(m, mtag);
                   1577: }
                   1578:
1.98      liamjfoy 1579: #ifdef GATEWAY
                   1580: /*
                   1581:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1582:  * we could reduce this value, call ip6flow_reap();
                   1583:  */
                   1584: static int
1.101     liamjfoy 1585: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.98      liamjfoy 1586: {
1.121     simonb   1587:        int error;
1.98      liamjfoy 1588:
1.121     simonb   1589:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1590:        if (error || newp == NULL)
                   1591:                return (error);
1.98      liamjfoy 1592:
1.121     simonb   1593:        mutex_enter(softnet_lock);
1.122     matt     1594:        KERNEL_LOCK(1, NULL);
1.120     matt     1595:
1.121     simonb   1596:        ip6flow_reap(0);
1.120     matt     1597:
                   1598:        KERNEL_UNLOCK_ONE(NULL);
1.121     simonb   1599:        mutex_exit(softnet_lock);
1.98      liamjfoy 1600:
1.121     simonb   1601:        return (0);
1.98      liamjfoy 1602: }
1.99      liamjfoy 1603:
                   1604: static int
                   1605: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
                   1606: {
                   1607:        int error, tmp;
                   1608:        struct sysctlnode node;
                   1609:
                   1610:        node = *rnode;
                   1611:        tmp = ip6_hashsize;
                   1612:        node.sysctl_data = &tmp;
                   1613:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1614:        if (error || newp == NULL)
                   1615:                return (error);
                   1616:
                   1617:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1618:                /*
                   1619:                 * Can only fail due to malloc()
                   1620:                 */
1.120     matt     1621:                mutex_enter(softnet_lock);
1.122     matt     1622:                KERNEL_LOCK(1, NULL);
1.120     matt     1623:
                   1624:                error = ip6flow_invalidate_all(tmp);
                   1625:
                   1626:                KERNEL_UNLOCK_ONE(NULL);
                   1627:                mutex_exit(softnet_lock);
1.99      liamjfoy 1628:        } else {
                   1629:                /*
                   1630:                 * EINVAL if not a power of 2
1.121     simonb   1631:                 */
1.120     matt     1632:                error = EINVAL;
1.99      liamjfoy 1633:        }
                   1634:
1.120     matt     1635:        return error;
1.99      liamjfoy 1636: }
1.98      liamjfoy 1637: #endif /* GATEWAY */
                   1638:
1.2       itojun   1639: /*
                   1640:  * System control for IP6
                   1641:  */
                   1642:
1.120     matt     1643: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2       itojun   1644:        0,              0,              0,              0,
                   1645:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1646:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1647:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1648:        0,              0,              0,              0,
                   1649:        ENOPROTOOPT
                   1650: };
                   1651:
1.116     thorpej  1652: static int
                   1653: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
                   1654: {
                   1655:
1.119     thorpej  1656:        return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116     thorpej  1657: }
                   1658:
1.128     pooka    1659: static void
                   1660: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2       itojun   1661: {
1.85      rpaulo   1662: #ifdef RFC2292
                   1663: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1664: #else
                   1665: #define IS2292(x, y)   (y)
                   1666: #endif
1.26      itojun   1667:
1.73      atatat   1668:        sysctl_createv(clog, 0, NULL, NULL,
                   1669:                       CTLFLAG_PERMANENT,
1.70      atatat   1670:                       CTLTYPE_NODE, "net", NULL,
                   1671:                       NULL, 0, NULL, 0,
                   1672:                       CTL_NET, CTL_EOL);
1.73      atatat   1673:        sysctl_createv(clog, 0, NULL, NULL,
                   1674:                       CTLFLAG_PERMANENT,
1.74      atatat   1675:                       CTLTYPE_NODE, "inet6",
                   1676:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1677:                       NULL, 0, NULL, 0,
                   1678:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1679:        sysctl_createv(clog, 0, NULL, NULL,
                   1680:                       CTLFLAG_PERMANENT,
1.74      atatat   1681:                       CTLTYPE_NODE, "ip6",
                   1682:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1683:                       NULL, 0, NULL, 0,
                   1684:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1685:
1.73      atatat   1686:        sysctl_createv(clog, 0, NULL, NULL,
                   1687:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1688:                       CTLTYPE_INT, "forwarding",
                   1689:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1690:                       NULL, 0, &ip6_forwarding, 0,
                   1691:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1692:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1693:        sysctl_createv(clog, 0, NULL, NULL,
                   1694:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1695:                       CTLTYPE_INT, "redirect",
                   1696:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1697:                       NULL, 0, &ip6_sendredirects, 0,
                   1698:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1699:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1700:        sysctl_createv(clog, 0, NULL, NULL,
                   1701:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1702:                       CTLTYPE_INT, "hlim",
                   1703:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1704:                       NULL, 0, &ip6_defhlim, 0,
                   1705:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1706:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1707: #ifdef notyet
1.73      atatat   1708:        sysctl_createv(clog, 0, NULL, NULL,
                   1709:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1710:                       CTLTYPE_INT, "mtu", NULL,
                   1711:                       NULL, 0, &, 0,
                   1712:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1713:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1714: #endif
                   1715: #ifdef __no_idea__
1.73      atatat   1716:        sysctl_createv(clog, 0, NULL, NULL,
                   1717:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1718:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1719:                       NULL, 0, &?, 0,
                   1720:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1721:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1722:        sysctl_createv(clog, 0, NULL, NULL,
                   1723:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1724:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1725:                       NULL, 0, &?, sizeof(?),
                   1726:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1727:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1728:        sysctl_createv(clog, 0, NULL, NULL,
                   1729:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1730:                       CTLTYPE_?, "mrtproto", NULL,
                   1731:                       NULL, 0, &?, sizeof(?),
                   1732:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1733:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1734: #endif
1.73      atatat   1735:        sysctl_createv(clog, 0, NULL, NULL,
                   1736:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1737:                       CTLTYPE_INT, "maxfragpackets",
                   1738:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1739:                                    "for reassembly"),
1.70      atatat   1740:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1741:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1742:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1743: #ifdef __no_idea__
1.73      atatat   1744:        sysctl_createv(clog, 0, NULL, NULL,
                   1745:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1746:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1747:                       NULL, 0, &?, 0,
                   1748:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1749:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1750:        sysctl_createv(clog, 0, NULL, NULL,
                   1751:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1752:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1753:                       NULL, 0, &?, 0,
                   1754:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1755:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1756: #endif
1.73      atatat   1757:        sysctl_createv(clog, 0, NULL, NULL,
                   1758:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1759:                       CTLTYPE_INT, "accept_rtadv",
                   1760:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1761:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1762:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1763:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1764:        sysctl_createv(clog, 0, NULL, NULL,
                   1765:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.131     spz      1766:                       CTLTYPE_INT, "rtadv_maxroutes",
                   1767:                       SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"),
                   1768:                       NULL, 0, &ip6_rtadv_maxroutes, 0,
                   1769:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1770:                       IPV6CTL_RTADV_MAXROUTES, CTL_EOL);
                   1771:        sysctl_createv(clog, 0, NULL, NULL,
                   1772:                       CTLFLAG_PERMANENT,
                   1773:                       CTLTYPE_INT, "rtadv_numroutes",
                   1774:                       SYSCTL_DESCR("Current number of routes accepted via router advertisements"),
                   1775:                       NULL, 0, &nd6_numroutes, 0,
                   1776:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1777:                       IPV6CTL_RTADV_NUMROUTES, CTL_EOL);
                   1778:        sysctl_createv(clog, 0, NULL, NULL,
                   1779:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1780:                       CTLTYPE_INT, "keepfaith",
                   1781:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1782:                       NULL, 0, &ip6_keepfaith, 0,
                   1783:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1784:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1785:        sysctl_createv(clog, 0, NULL, NULL,
                   1786:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1787:                       CTLTYPE_INT, "log_interval",
                   1788:                       SYSCTL_DESCR("Minumum interval between logging "
                   1789:                                    "unroutable packets"),
1.70      atatat   1790:                       NULL, 0, &ip6_log_interval, 0,
                   1791:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1792:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1793:        sysctl_createv(clog, 0, NULL, NULL,
                   1794:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1795:                       CTLTYPE_INT, "hdrnestlimit",
                   1796:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1797:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1798:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1799:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1800:        sysctl_createv(clog, 0, NULL, NULL,
                   1801:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1802:                       CTLTYPE_INT, "dad_count",
                   1803:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1804:                                    "probes to send"),
1.70      atatat   1805:                       NULL, 0, &ip6_dad_count, 0,
                   1806:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1807:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1808:        sysctl_createv(clog, 0, NULL, NULL,
                   1809:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1810:                       CTLTYPE_INT, "auto_flowlabel",
                   1811:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1812:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1813:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1814:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1815:        sysctl_createv(clog, 0, NULL, NULL,
                   1816:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1817:                       CTLTYPE_INT, "defmcasthlim",
                   1818:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1819:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1820:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1821:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1822: #if NGIF > 0
1.73      atatat   1823:        sysctl_createv(clog, 0, NULL, NULL,
                   1824:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1825:                       CTLTYPE_INT, "gifhlim",
                   1826:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1827:                       NULL, 0, &ip6_gif_hlim, 0,
                   1828:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1829:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1830: #endif /* NGIF */
1.73      atatat   1831:        sysctl_createv(clog, 0, NULL, NULL,
                   1832:                       CTLFLAG_PERMANENT,
1.74      atatat   1833:                       CTLTYPE_STRING, "kame_version",
                   1834:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1835:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1836:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1837:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1838:        sysctl_createv(clog, 0, NULL, NULL,
                   1839:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1840:                       CTLTYPE_INT, "use_deprecated",
                   1841:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1842:                                    "source addresses"),
1.70      atatat   1843:                       NULL, 0, &ip6_use_deprecated, 0,
                   1844:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1845:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1846:        sysctl_createv(clog, 0, NULL, NULL,
                   1847:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1848:                       CTLTYPE_INT, "rr_prune", NULL,
                   1849:                       NULL, 0, &ip6_rr_prune, 0,
                   1850:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1851:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1852:        sysctl_createv(clog, 0, NULL, NULL,
                   1853:                       CTLFLAG_PERMANENT
1.70      atatat   1854: #ifndef INET6_BINDV6ONLY
1.73      atatat   1855:                       |CTLFLAG_READWRITE,
1.70      atatat   1856: #endif
1.74      atatat   1857:                       CTLTYPE_INT, "v6only",
                   1858:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1859:                                    "to PF_INET sockets"),
1.70      atatat   1860:                       NULL, 0, &ip6_v6only, 0,
                   1861:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1862:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1863:        sysctl_createv(clog, 0, NULL, NULL,
                   1864:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1865:                       CTLTYPE_INT, "anonportmin",
                   1866:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1867:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1868:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1869:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1870:        sysctl_createv(clog, 0, NULL, NULL,
                   1871:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1872:                       CTLTYPE_INT, "anonportmax",
                   1873:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1874:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1875:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1876:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1877: #ifndef IPNOPRIVPORTS
1.73      atatat   1878:        sysctl_createv(clog, 0, NULL, NULL,
                   1879:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1880:                       CTLTYPE_INT, "lowportmin",
                   1881:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1882:                                    "to assign"),
1.70      atatat   1883:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1884:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1885:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1886:        sysctl_createv(clog, 0, NULL, NULL,
                   1887:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1888:                       CTLTYPE_INT, "lowportmax",
                   1889:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1890:                                    "to assign"),
1.70      atatat   1891:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1892:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1893:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1894: #endif /* IPNOPRIVPORTS */
1.73      atatat   1895:        sysctl_createv(clog, 0, NULL, NULL,
                   1896:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1897:                       CTLTYPE_INT, "use_tempaddr",
                   1898:                       SYSCTL_DESCR("Use temporary address"),
                   1899:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1900:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1901:                       CTL_CREATE, CTL_EOL);
                   1902:        sysctl_createv(clog, 0, NULL, NULL,
                   1903:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1904:                       CTLTYPE_INT, "temppltime",
                   1905:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1906:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1907:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1908:                       CTL_CREATE, CTL_EOL);
                   1909:        sysctl_createv(clog, 0, NULL, NULL,
                   1910:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1911:                       CTLTYPE_INT, "tempvltime",
                   1912:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1913:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1914:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1915:                       CTL_CREATE, CTL_EOL);
                   1916:        sysctl_createv(clog, 0, NULL, NULL,
                   1917:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1918:                       CTLTYPE_INT, "maxfrags",
                   1919:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1920:                       NULL, 0, &ip6_maxfrags, 0,
                   1921:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1922:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1923:        sysctl_createv(clog, 0, NULL, NULL,
                   1924:                       CTLFLAG_PERMANENT,
                   1925:                       CTLTYPE_STRUCT, "stats",
                   1926:                       SYSCTL_DESCR("IPv6 statistics"),
1.116     thorpej  1927:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1928:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1929:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1930:        sysctl_createv(clog, 0, NULL, NULL,
                   1931:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1932:                       CTLTYPE_INT, "use_defaultzone",
                   1933:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1934:                       NULL, 0, &ip6_use_defzone, 0,
                   1935:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1936:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1937:        sysctl_createv(clog, 0, NULL, NULL,
                   1938:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1939:                       CTLTYPE_INT, "mcast_pmtu",
                   1940:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1941:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1942:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1943:                       CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1944: #ifdef GATEWAY
                   1945:        sysctl_createv(clog, 0, NULL, NULL,
                   1946:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1947:                        CTLTYPE_INT, "maxflows",
                   1948:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1949:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1950:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1951:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1952:        sysctl_createv(clog, 0, NULL, NULL,
                   1953:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1954:                        CTLTYPE_INT, "hashsize",
                   1955:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1956:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1957:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1958:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1959: #endif
1.138     christos 1960:        /* anonportalgo RFC6056 subtree */
1.140     christos 1961:        const struct sysctlnode *portalgo_node;
                   1962:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.138     christos 1963:                       CTLFLAG_PERMANENT,
                   1964:                       CTLTYPE_NODE, "anonportalgo",
                   1965:                       SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"),
                   1966:                       NULL, 0, NULL, 0,
                   1967:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL);
1.140     christos 1968:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.138     christos 1969:                       CTLFLAG_PERMANENT,
                   1970:                       CTLTYPE_STRING, "available",
                   1971:                       SYSCTL_DESCR("available algorithms"),
1.140     christos 1972:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.138     christos 1973:                       CTL_CREATE, CTL_EOL);
1.140     christos 1974:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.138     christos 1975:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1976:                       CTLTYPE_STRING, "selected",
                   1977:                       SYSCTL_DESCR("selected algorithm"),
1.140     christos 1978:                       sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN,
1.138     christos 1979:                       CTL_CREATE, CTL_EOL);
1.141     christos 1980:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1981:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1982:                       CTLTYPE_STRUCT, "reserve",
                   1983:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1984:                       sysctl_portalgo_reserve6, 0, NULL, 0,
                   1985:                       CTL_CREATE, CTL_EOL);
1.139     christos 1986:        sysctl_createv(clog, 0, NULL, NULL,
                   1987:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1988:                       CTLTYPE_INT, "neighborgcthresh",
                   1989:                       SYSCTL_DESCR("Maximum number of entries in neighbor"
                   1990:                        " cache"),
                   1991:                       NULL, 1, &ip6_neighborgcthresh, 0,
                   1992:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1993:                       CTL_CREATE, CTL_EOL);
                   1994:        sysctl_createv(clog, 0, NULL, NULL,
                   1995:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1996:                       CTLTYPE_INT, "maxifprefixes",
                   1997:                       SYSCTL_DESCR("Maximum number of prefixes created by"
                   1998:                           " route advertisement per interface"),
                   1999:                       NULL, 1, &ip6_maxifprefixes, 0,
                   2000:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   2001:                       CTL_CREATE, CTL_EOL);
                   2002:        sysctl_createv(clog, 0, NULL, NULL,
                   2003:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2004:                       CTLTYPE_INT, "maxifdefrouters",
                   2005:                       SYSCTL_DESCR("Maximum number of default routers created"
                   2006:                           " by route advertisement per interface"),
                   2007:                       NULL, 1, &ip6_maxifdefrouters, 0,
                   2008:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   2009:                       CTL_CREATE, CTL_EOL);
                   2010:        sysctl_createv(clog, 0, NULL, NULL,
                   2011:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   2012:                       CTLTYPE_INT, "maxdynroutes",
                   2013:                       SYSCTL_DESCR("Maximum number of routes created via"
                   2014:                           " redirect"),
                   2015:                       NULL, 1, &ip6_maxdynroutes, 0,
                   2016:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   2017:                       CTL_CREATE, CTL_EOL);
1.2       itojun   2018: }
1.116     thorpej  2019:
                   2020: void
                   2021: ip6_statinc(u_int stat)
                   2022: {
                   2023:
                   2024:        KASSERT(stat < IP6_NSTATS);
                   2025:        IP6_STATINC(stat);
                   2026: }

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