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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.31

1.31    ! thorpej     1: /*     $NetBSD: ip6_input.c,v 1.30 2000/12/14 17:36:45 thorpej Exp $   */
1.27      itojun      2: /*     $KAME: ip6_input.c,v 1.121 2000/08/31 06:07:29 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.
                     45:  * 3. All advertising materials mentioning features or use of this software
                     46:  *    must display the following acknowledgement:
                     47:  *     This product includes software developed by the University of
                     48:  *     California, Berkeley and its contributors.
                     49:  * 4. Neither the name of the University nor the names of its contributors
                     50:  *    may be used to endorse or promote products derived from this software
                     51:  *    without specific prior written permission.
                     52:  *
                     53:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     54:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     55:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     56:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     57:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     58:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     59:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     60:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     61:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     62:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     63:  * SUCH DAMAGE.
                     64:  *
                     65:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     66:  */
                     67:
                     68: #include "opt_inet.h"
1.4       thorpej    69: #include "opt_ipsec.h"
1.15      darrenr    70: #include "opt_pfil_hooks.h"
1.2       itojun     71:
                     72: #include <sys/param.h>
                     73: #include <sys/systm.h>
                     74: #include <sys/malloc.h>
                     75: #include <sys/mbuf.h>
                     76: #include <sys/domain.h>
                     77: #include <sys/protosw.h>
                     78: #include <sys/socket.h>
                     79: #include <sys/socketvar.h>
                     80: #include <sys/errno.h>
                     81: #include <sys/time.h>
                     82: #include <sys/kernel.h>
                     83: #include <sys/syslog.h>
                     84: #include <sys/proc.h>
                     85:
                     86: #include <net/if.h>
                     87: #include <net/if_types.h>
                     88: #include <net/if_dl.h>
                     89: #include <net/route.h>
                     90: #include <net/netisr.h>
1.15      darrenr    91: #ifdef PFIL_HOOKS
                     92: #include <net/pfil.h>
                     93: #endif
1.2       itojun     94:
                     95: #include <netinet/in.h>
1.9       itojun     96: #include <netinet/in_systm.h>
                     97: #ifdef INET
                     98: #include <netinet/ip.h>
                     99: #include <netinet/ip_icmp.h>
                    100: #endif /*INET*/
1.14      itojun    101: #include <netinet/ip6.h>
1.2       itojun    102: #include <netinet6/in6_var.h>
1.11      itojun    103: #include <netinet6/ip6_var.h>
1.2       itojun    104: #include <netinet6/in6_pcb.h>
1.14      itojun    105: #include <netinet/icmp6.h>
1.2       itojun    106: #include <netinet6/in6_ifattach.h>
                    107: #include <netinet6/nd6.h>
1.9       itojun    108: #include <netinet6/in6_prefix.h>
1.2       itojun    109:
1.9       itojun    110: #ifdef IPV6FIREWALL
                    111: #include <netinet6/ip6_fw.h>
                    112: #endif
1.2       itojun    113:
                    114: #include <netinet6/ip6protosw.h>
                    115:
                    116: /* we need it for NLOOP. */
                    117: #include "loop.h"
                    118: #include "faith.h"
                    119:
                    120: #include "gif.h"
                    121: #include "bpfilter.h"
                    122:
1.9       itojun    123: #include <net/net_osdep.h>
                    124:
1.2       itojun    125: extern struct domain inet6domain;
                    126:
                    127: u_char ip6_protox[IPPROTO_MAX];
                    128: static int ip6qmaxlen = IFQ_MAXLEN;
                    129: struct in6_ifaddr *in6_ifaddr;
                    130: struct ifqueue ip6intrq;
                    131:
                    132: extern struct ifnet loif[NLOOP];
                    133: int ip6_forward_srcrt;                 /* XXX */
                    134: int ip6_sourcecheck;                   /* XXX */
                    135: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    136:
                    137: #ifdef IPV6FIREWALL
                    138: /* firewall hooks */
                    139: ip6_fw_chk_t *ip6_fw_chk_ptr;
                    140: ip6_fw_ctl_t *ip6_fw_ctl_ptr;
1.2       itojun    141: #endif
                    142:
1.29      thorpej   143: #ifdef PFIL_HOOKS
                    144: struct pfil_head inet6_pfil_hook;
                    145: #endif
                    146:
1.2       itojun    147: struct ip6stat ip6stat;
                    148:
                    149: static void ip6_init2 __P((void *));
                    150:
1.5       itojun    151: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2       itojun    152:
                    153: /*
                    154:  * IP6 initialization: fill in IP6 protocol switch table.
                    155:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    156:  */
                    157: void
                    158: ip6_init()
                    159: {
                    160:        register struct ip6protosw *pr;
                    161:        register int i;
                    162:        struct timeval tv;
                    163:
                    164:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    165:        if (pr == 0)
                    166:                panic("ip6_init");
                    167:        for (i = 0; i < IPPROTO_MAX; i++)
                    168:                ip6_protox[i] = pr - inet6sw;
                    169:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    170:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    171:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    172:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    173:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    174:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    175:        nd6_init();
                    176:        frag6_init();
1.9       itojun    177: #ifdef IPV6FIREWALL
                    178:        ip6_fw_init();
                    179: #endif
1.2       itojun    180:        /*
                    181:         * in many cases, random() here does NOT return random number
                    182:         * as initialization during bootstrap time occur in fixed order.
                    183:         */
                    184:        microtime(&tv);
                    185:        ip6_flow_seq = random() ^ tv.tv_usec;
                    186:
                    187:        ip6_init2((void *)0);
1.29      thorpej   188:
                    189: #ifdef PFIL_HOOKS
                    190:        /* Register our Packet Filter hook. */
1.31    ! thorpej   191:        inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
        !           192:        inet6_pfil_hook.ph_af   = AF_INET6;
1.29      thorpej   193:        i = pfil_head_register(&inet6_pfil_hook);
                    194:        if (i != 0)
                    195:                printf("ip6_init: WARNING: unable to register pfil hook, "
                    196:                    "error %d\n", i);
                    197: #endif /* PFIL_HOOKS */
1.2       itojun    198: }
                    199:
                    200: static void
                    201: ip6_init2(dummy)
                    202:        void *dummy;
                    203: {
                    204:        /*
                    205:         * to route local address of p2p link to loopback,
1.21      itojun    206:         * assign loopback address first.
1.2       itojun    207:         */
1.20      itojun    208:        in6_ifattach(&loif[0], NULL);
1.2       itojun    209:
                    210:        /* nd6_timer_init */
1.19      thorpej   211:        callout_init(&nd6_timer_ch);
                    212:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.9       itojun    213:        /* router renumbering prefix list maintenance */
1.19      thorpej   214:        callout_init(&in6_rr_timer_ch);
                    215:        callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
1.2       itojun    216: }
                    217:
                    218: /*
                    219:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    220:  */
                    221: void
                    222: ip6intr()
                    223: {
                    224:        int s;
                    225:        struct mbuf *m;
                    226:
                    227:        for (;;) {
                    228:                s = splimp();
                    229:                IF_DEQUEUE(&ip6intrq, m);
                    230:                splx(s);
                    231:                if (m == 0)
                    232:                        return;
                    233:                ip6_input(m);
                    234:        }
                    235: }
                    236:
                    237: extern struct  route_in6 ip6_forward_rt;
                    238:
                    239: void
                    240: ip6_input(m)
                    241:        struct mbuf *m;
                    242: {
1.9       itojun    243:        struct ip6_hdr *ip6;
1.2       itojun    244:        int off = sizeof(struct ip6_hdr), nest;
                    245:        u_int32_t plen;
1.5       itojun    246:        u_int32_t rtalert = ~0;
1.2       itojun    247:        int nxt, ours = 0;
1.9       itojun    248:        struct ifnet *deliverifp = NULL;
1.2       itojun    249:
                    250: #ifdef IPSEC
                    251:        /*
                    252:         * should the inner packet be considered authentic?
                    253:         * see comment in ah4_input().
                    254:         */
                    255:        if (m) {
                    256:                m->m_flags &= ~M_AUTHIPHDR;
                    257:                m->m_flags &= ~M_AUTHIPDGM;
                    258:        }
                    259: #endif
1.9       itojun    260:
1.2       itojun    261:        /*
                    262:         * mbuf statistics by kazu
                    263:         */
                    264:        if (m->m_flags & M_EXT) {
                    265:                if (m->m_next)
                    266:                        ip6stat.ip6s_mext2m++;
                    267:                else
                    268:                        ip6stat.ip6s_mext1++;
                    269:        } else {
                    270:                if (m->m_next) {
1.9       itojun    271:                        if (m->m_flags & M_LOOP) {
1.2       itojun    272:                                ip6stat.ip6s_m2m[loif[0].if_index]++;   /*XXX*/
1.22      itojun    273:                        } else if (m->m_pkthdr.rcvif->if_index <= 31)
1.2       itojun    274:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    275:                        else
                    276:                                ip6stat.ip6s_m2m[0]++;
                    277:                } else
                    278:                        ip6stat.ip6s_m1++;
                    279:        }
                    280:
1.9       itojun    281:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
                    282:        ip6stat.ip6s_total++;
                    283:
                    284: #ifndef PULLDOWN_TEST
                    285:        /* XXX is the line really necessary? */
1.2       itojun    286:        IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
1.9       itojun    287: #endif
1.2       itojun    288:
1.9       itojun    289:        if (m->m_len < sizeof(struct ip6_hdr)) {
                    290:                struct ifnet *inifp;
                    291:                inifp = m->m_pkthdr.rcvif;
                    292:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
                    293:                        ip6stat.ip6s_toosmall++;
                    294:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    295:                        return;
                    296:                }
1.2       itojun    297:        }
                    298:
                    299:        ip6 = mtod(m, struct ip6_hdr *);
                    300:
                    301:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    302:                ip6stat.ip6s_badvers++;
1.9       itojun    303:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    304:                goto bad;
                    305:        }
1.15      darrenr   306:
                    307: #ifdef PFIL_HOOKS
                    308:        /*
                    309:         * Run through list of hooks for input packets.  If there are any
                    310:         * filters which require that additional packets in the flow are
                    311:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    312:         * Note that filters must _never_ set this flag, as another filter
                    313:         * in the list may have previously cleared it.
                    314:         */
1.29      thorpej   315:        if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
                    316:                           PFIL_IN) != 0)
                    317:                return;
                    318:        if (m == NULL)
                    319:                return;
                    320:        ip6 = mtod(m, struct ip6_hdr *);
1.15      darrenr   321: #endif /* PFIL_HOOKS */
                    322:
1.2       itojun    323:
                    324:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    325:
1.9       itojun    326: #ifdef IPV6FIREWALL
                    327:        /*
                    328:         * Check with the firewall...
                    329:         */
                    330:        if (ip6_fw_chk_ptr) {
                    331:                u_short port = 0;
                    332:                /* If ipfw says divert, we have to just drop packet */
                    333:                /* use port as a dummy argument */
                    334:                if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
                    335:                        m_freem(m);
                    336:                        m = NULL;
                    337:                }
                    338:                if (!m)
                    339:                        return;
1.30      thorpej   340:        }
                    341: #endif
                    342:
                    343: #ifdef ALTQ
                    344:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
                    345:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    346:                /* packet is dropped by traffic conditioner */
                    347:                return;
1.9       itojun    348:        }
                    349: #endif
                    350:
1.2       itojun    351:        /*
                    352:         * Scope check
                    353:         */
                    354:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    355:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
                    356:                ip6stat.ip6s_badscope++;
1.9       itojun    357:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    358:                goto bad;
                    359:        }
1.13      itojun    360:        /*
                    361:         * The following check is not documented in the spec.  Malicious party
                    362:         * may be able to use IPv4 mapped addr to confuse tcp/udp stack and
                    363:         * bypass security checks (act as if it was from 127.0.0.1 by using
                    364:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    365:         */
                    366:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    367:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    368:                ip6stat.ip6s_badscope++;
                    369:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    370:                goto bad;
                    371:        }
1.17      itojun    372: #if 0
1.13      itojun    373:        /*
1.17      itojun    374:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    375:         *
                    376:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    377:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    378:         * is revised to forbid relaying case.
1.13      itojun    379:         */
                    380:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    381:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
                    382:                ip6stat.ip6s_badscope++;
                    383:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    384:                goto bad;
                    385:        }
                    386: #endif
1.2       itojun    387:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    388:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    389:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    390:                        ours = 1;
1.9       itojun    391:                        deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    392:                        goto hbhcheck;
                    393:                } else {
                    394:                        ip6stat.ip6s_badscope++;
1.9       itojun    395:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    396:                        goto bad;
                    397:                }
                    398:        }
                    399:
1.21      itojun    400: #ifndef FAKE_LOOPBACK_IF
                    401:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0)
                    402: #else
                    403:        if (1)
                    404: #endif
                    405:        {
1.2       itojun    406:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    407:                        ip6->ip6_src.s6_addr16[1]
                    408:                                = htons(m->m_pkthdr.rcvif->if_index);
                    409:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    410:                        ip6->ip6_dst.s6_addr16[1]
                    411:                                = htons(m->m_pkthdr.rcvif->if_index);
                    412:        }
                    413:
1.9       itojun    414:        /*
1.21      itojun    415:         * XXX we need this since we do not have "goto ours" hack route
                    416:         * for some of our ifaddrs on loopback interface.
                    417:         * we should correct it by changing in6_ifattach to install
                    418:         * "goto ours" hack route.
1.9       itojun    419:         */
1.21      itojun    420:        if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0) {
                    421:                if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    422:                        ours = 1;
                    423:                        deliverifp = m->m_pkthdr.rcvif;
                    424:                        goto hbhcheck;
                    425:                }
1.9       itojun    426:        }
                    427:
1.2       itojun    428:        /*
                    429:         * Multicast check
                    430:         */
                    431:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    432:                struct  in6_multi *in6m = 0;
1.9       itojun    433:
                    434:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    435:                /*
                    436:                 * See if we belong to the destination multicast group on the
                    437:                 * arrival interface.
                    438:                 */
                    439:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    440:                if (in6m)
                    441:                        ours = 1;
                    442:                else if (!ip6_mrouter) {
                    443:                        ip6stat.ip6s_notmember++;
                    444:                        ip6stat.ip6s_cantforward++;
1.9       itojun    445:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    446:                        goto bad;
                    447:                }
1.9       itojun    448:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    449:                goto hbhcheck;
                    450:        }
                    451:
                    452:        /*
                    453:         *  Unicast check
                    454:         */
1.22      itojun    455:        if (ip6_forward_rt.ro_rt != NULL &&
                    456:            (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
                    457:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                    458:                               &ip6_forward_rt.ro_dst.sin6_addr))
1.25      itojun    459:                ip6stat.ip6s_forward_cachehit++;
1.22      itojun    460:        else {
1.2       itojun    461:                if (ip6_forward_rt.ro_rt) {
1.22      itojun    462:                        /* route is down or destination is different */
1.25      itojun    463:                        ip6stat.ip6s_forward_cachemiss++;
1.2       itojun    464:                        RTFREE(ip6_forward_rt.ro_rt);
                    465:                        ip6_forward_rt.ro_rt = 0;
                    466:                }
1.22      itojun    467:
1.2       itojun    468:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
                    469:                ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
                    470:                ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
                    471:                ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
                    472:
1.9       itojun    473:                rtalloc((struct route *)&ip6_forward_rt);
1.2       itojun    474:        }
                    475:
                    476: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    477:
                    478:        /*
                    479:         * Accept the packet if the forwarding interface to the destination
                    480:         * according to the routing table is the loopback interface,
                    481:         * unless the associated route has a gateway.
                    482:         * Note that this approach causes to accept a packet if there is a
                    483:         * route to the loopback interface for the destination of the packet.
                    484:         * But we think it's even useful in some situations, e.g. when using
                    485:         * a special daemon which wants to intercept the packet.
                    486:         */
                    487:        if (ip6_forward_rt.ro_rt &&
                    488:            (ip6_forward_rt.ro_rt->rt_flags &
                    489:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    490: #if 0
                    491:            /*
                    492:             * The check below is redundant since the comparison of
                    493:             * the destination and the key of the rtentry has
                    494:             * already done through looking up the routing table.
                    495:             */
                    496:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                    497:                               &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
                    498: #endif
1.9       itojun    499:            ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
1.2       itojun    500:                struct in6_ifaddr *ia6 =
                    501:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    502:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    503:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    504:                /*
                    505:                 * packets to a tentative, duplicated, or somehow invalid
                    506:                 * address must not be accepted.
                    507:                 */
1.2       itojun    508:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    509:                        /* this address is ready */
1.2       itojun    510:                        ours = 1;
1.9       itojun    511:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    512:                        goto hbhcheck;
                    513:                } else {
1.24      itojun    514:                        /* address is not ready, so discard the packet. */
                    515:                        log(LOG_INFO,
1.27      itojun    516:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    517:                            ip6_sprintf(&ip6->ip6_src),
                    518:                            ip6_sprintf(&ip6->ip6_dst));
                    519:
                    520:                        goto bad;
1.2       itojun    521:                }
                    522:        }
                    523:
                    524:        /*
                    525:         * FAITH(Firewall Aided Internet Translator)
                    526:         */
                    527: #if defined(NFAITH) && 0 < NFAITH
                    528:        if (ip6_keepfaith) {
                    529:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    530:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    531:                        /* XXX do we need more sanity checks? */
                    532:                        ours = 1;
1.9       itojun    533:                        deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/
                    534:                        goto hbhcheck;
                    535:                }
                    536:        }
                    537: #endif
                    538:
                    539: #if 0
                    540:     {
                    541:        /*
                    542:         * Last resort: check in6_ifaddr for incoming interface.
                    543:         * The code is here until I update the "goto ours hack" code above
                    544:         * working right.
                    545:         */
                    546:        struct ifaddr *ifa;
                    547:        for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
                    548:             ifa;
                    549:             ifa = ifa->ifa_list.tqe_next) {
                    550:                if (ifa->ifa_addr == NULL)
                    551:                        continue;       /* just for safety */
                    552:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    553:                        continue;
                    554:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    555:                        ours = 1;
                    556:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    557:                        goto hbhcheck;
                    558:                }
                    559:        }
1.9       itojun    560:     }
1.2       itojun    561: #endif
                    562:
                    563:        /*
                    564:         * Now there is no reason to process the packet if it's not our own
                    565:         * and we're not a router.
                    566:         */
                    567:        if (!ip6_forwarding) {
                    568:                ip6stat.ip6s_cantforward++;
1.9       itojun    569:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    570:                goto bad;
                    571:        }
                    572:
                    573:   hbhcheck:
                    574:        /*
                    575:         * Process Hop-by-Hop options header if it's contained.
                    576:         * m may be modified in ip6_hopopts_input().
                    577:         * If a JumboPayload option is included, plen will also be modified.
                    578:         */
                    579:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    580:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    581:                struct ip6_hbh *hbh;
                    582:
                    583:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    584: #if 0  /*touches NULL pointer*/
                    585:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    586: #endif
1.2       itojun    587:                        return; /* m have already been freed */
1.9       itojun    588:                }
1.22      itojun    589:
1.2       itojun    590:                /* adjust pointer */
                    591:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    592:
                    593:                /*
                    594:                 * if the payload length field is 0 and the next header field
                    595:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    596:                 * option MUST be included.
                    597:                 */
                    598:                if (ip6->ip6_plen == 0 && plen == 0) {
                    599:                        /*
                    600:                         * Note that if a valid jumbo payload option is
                    601:                         * contained, ip6_hoptops_input() must set a valid
                    602:                         * (non-zero) payload length to the variable plen.
                    603:                         */
                    604:                        ip6stat.ip6s_badoptions++;
                    605:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    606:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    607:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    608:                                    ICMP6_PARAMPROB_HEADER,
                    609:                                    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
                    610:                        return;
                    611:                }
1.9       itojun    612: #ifndef PULLDOWN_TEST
                    613:                /* ip6_hopopts_input() ensures that mbuf is contiguous */
                    614:                hbh = (struct ip6_hbh *)(ip6 + 1);
                    615: #else
                    616:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    617:                        sizeof(struct ip6_hbh));
                    618:                if (hbh == NULL) {
                    619:                        ip6stat.ip6s_tooshort++;
                    620:                        return;
                    621:                }
                    622: #endif
                    623:                nxt = hbh->ip6h_nxt;
1.2       itojun    624:
                    625:                /*
                    626:                 * accept the packet if a router alert option is included
                    627:                 * and we act as an IPv6 router.
                    628:                 */
1.5       itojun    629:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    630:                        ours = 1;
                    631:        } else
                    632:                nxt = ip6->ip6_nxt;
                    633:
                    634:        /*
                    635:         * Check that the amount of data in the buffers
                    636:         * is as at least much as the IPv6 header would have us expect.
                    637:         * Trim mbufs if longer than we expect.
                    638:         * Drop packet if shorter than we expect.
                    639:         */
                    640:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    641:                ip6stat.ip6s_tooshort++;
1.9       itojun    642:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    643:                goto bad;
                    644:        }
                    645:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    646:                if (m->m_len == m->m_pkthdr.len) {
                    647:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    648:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    649:                } else
                    650:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    651:        }
                    652:
                    653:        /*
                    654:         * Forward if desirable.
                    655:         */
                    656:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    657:                /*
                    658:                 * If we are acting as a multicast router, all
                    659:                 * incoming multicast packets are passed to the
                    660:                 * kernel-level multicast forwarding function.
                    661:                 * The packet is returned (relatively) intact; if
                    662:                 * ip6_mforward() returns a non-zero value, the packet
                    663:                 * must be discarded, else it may be accepted below.
                    664:                 */
                    665:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    666:                        ip6stat.ip6s_cantforward++;
                    667:                        m_freem(m);
                    668:                        return;
                    669:                }
                    670:                if (!ours) {
                    671:                        m_freem(m);
                    672:                        return;
                    673:                }
1.22      itojun    674:        } else if (!ours) {
1.2       itojun    675:                ip6_forward(m, 0);
                    676:                return;
                    677:        }
1.25      itojun    678:
                    679:        ip6 = mtod(m, struct ip6_hdr *);
                    680:
                    681:        /*
                    682:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    683:         * tcp/udp stack and bypass security checks (act as if it was from
                    684:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    685:         *
                    686:         * For SIIT end node behavior, you may want to disable the check.
                    687:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    688:         * source.
                    689:         */
                    690:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    691:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
                    692:                ip6stat.ip6s_badscope++;
                    693:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    694:                goto bad;
                    695:        }
1.2       itojun    696:
                    697:        /*
                    698:         * Tell launch routine the next header
                    699:         */
1.12      itojun    700: #ifdef IFA_STATS
1.28      itojun    701:        if (deliverifp != NULL) {
1.9       itojun    702:                struct in6_ifaddr *ia6;
                    703:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    704:                if (ia6)
                    705:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    706:        }
                    707: #endif
1.2       itojun    708:        ip6stat.ip6s_delivered++;
1.9       itojun    709:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    710:        nest = 0;
                    711:        while (nxt != IPPROTO_DONE) {
                    712:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    713:                        ip6stat.ip6s_toomanyhdr++;
                    714:                        goto bad;
                    715:                }
1.8       itojun    716:
                    717:                /*
                    718:                 * protection against faulty packet - there should be
                    719:                 * more sanity checks in header chain processing.
                    720:                 */
                    721:                if (m->m_pkthdr.len < off) {
                    722:                        ip6stat.ip6s_tooshort++;
1.9       itojun    723:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    724:                        goto bad;
                    725:                }
                    726:
1.2       itojun    727:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    728:        }
                    729:        return;
                    730:  bad:
                    731:        m_freem(m);
                    732: }
                    733:
                    734: /*
                    735:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    736:  * included, the real payload length will be stored in plenp.
                    737:  */
                    738: static int
                    739: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    740:        u_int32_t *plenp;
1.5       itojun    741:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2       itojun    742:        struct mbuf **mp;
                    743:        int *offp;
                    744: {
                    745:        register struct mbuf *m = *mp;
                    746:        int off = *offp, hbhlen;
                    747:        struct ip6_hbh *hbh;
                    748:        u_int8_t *opt;
                    749:
                    750:        /* validation of the length of the header */
1.9       itojun    751: #ifndef PULLDOWN_TEST
1.2       itojun    752:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
                    753:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    754:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    755:
                    756:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
                    757:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1.9       itojun    758: #else
                    759:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    760:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    761:        if (hbh == NULL) {
                    762:                ip6stat.ip6s_tooshort++;
                    763:                return -1;
                    764:        }
                    765:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    766:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    767:                hbhlen);
                    768:        if (hbh == NULL) {
                    769:                ip6stat.ip6s_tooshort++;
                    770:                return -1;
                    771:        }
                    772: #endif
1.2       itojun    773:        off += hbhlen;
                    774:        hbhlen -= sizeof(struct ip6_hbh);
                    775:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    776:
                    777:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    778:                                hbhlen, rtalertp, plenp) < 0)
                    779:                return(-1);
                    780:
                    781:        *offp = off;
                    782:        *mp = m;
                    783:        return(0);
                    784: }
                    785:
                    786: /*
                    787:  * Search header for all Hop-by-hop options and process each option.
                    788:  * This function is separate from ip6_hopopts_input() in order to
                    789:  * handle a case where the sending node itself process its hop-by-hop
                    790:  * options header. In such a case, the function is called from ip6_output().
                    791:  */
                    792: int
                    793: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    794:        struct mbuf *m;
                    795:        u_int8_t *opthead;
                    796:        int hbhlen;
1.5       itojun    797:        u_int32_t *rtalertp;
1.2       itojun    798:        u_int32_t *plenp;
                    799: {
                    800:        struct ip6_hdr *ip6;
                    801:        int optlen = 0;
                    802:        u_int8_t *opt = opthead;
                    803:        u_int16_t rtalert_val;
1.22      itojun    804:        u_int32_t jumboplen;
1.2       itojun    805:
                    806:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
                    807:                switch(*opt) {
                    808:                 case IP6OPT_PAD1:
                    809:                         optlen = 1;
                    810:                         break;
                    811:                 case IP6OPT_PADN:
                    812:                         if (hbhlen < IP6OPT_MINLEN) {
                    813:                                 ip6stat.ip6s_toosmall++;
                    814:                                 goto bad;
                    815:                         }
                    816:                         optlen = *(opt + 1) + 2;
                    817:                         break;
                    818:                 case IP6OPT_RTALERT:
1.8       itojun    819:                         /* XXX may need check for alignment */
1.2       itojun    820:                         if (hbhlen < IP6OPT_RTALERT_LEN) {
                    821:                                 ip6stat.ip6s_toosmall++;
                    822:                                 goto bad;
                    823:                         }
                    824:                         if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
                    825:                                  /* XXX: should we discard the packet? */
                    826:                                 log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
                    827:                                     *(opt + 1));
                    828:                         optlen = IP6OPT_RTALERT_LEN;
                    829:                         bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    830:                         *rtalertp = ntohs(rtalert_val);
                    831:                         break;
                    832:                 case IP6OPT_JUMBO:
1.22      itojun    833:                        /* XXX may need check for alignment */
                    834:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
                    835:                                ip6stat.ip6s_toosmall++;
                    836:                                goto bad;
                    837:                        }
                    838:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
                    839:                                 /* XXX: should we discard the packet? */
                    840:                                log(LOG_ERR, "length of jumbopayload opt "
1.27      itojun    841:                                    "is inconsistent(%d)\n",
1.22      itojun    842:                                    *(opt + 1));
                    843:                        optlen = IP6OPT_JUMBO_LEN;
                    844:
                    845:                        /*
                    846:                         * IPv6 packets that have non 0 payload length
                    847:                         * must not contain a jumbo paylod option.
                    848:                         */
                    849:                        ip6 = mtod(m, struct ip6_hdr *);
                    850:                        if (ip6->ip6_plen) {
                    851:                                ip6stat.ip6s_badoptions++;
                    852:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    853:                                            ICMP6_PARAMPROB_HEADER,
                    854:                                            sizeof(struct ip6_hdr) +
                    855:                                            sizeof(struct ip6_hbh) +
                    856:                                            opt - opthead);
                    857:                                return(-1);
                    858:                        }
1.2       itojun    859:
1.22      itojun    860:                        /*
                    861:                         * We may see jumbolen in unaligned location, so
                    862:                         * we'd need to perform bcopy().
                    863:                         */
                    864:                        bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
                    865:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    866:
                    867: #if 1
                    868:                        /*
                    869:                         * if there are multiple jumbo payload options,
                    870:                         * *plenp will be non-zero and the packet will be
                    871:                         * rejected.
                    872:                         * the behavior may need some debate in ipngwg -
                    873:                         * multiple options does not make sense, however,
                    874:                         * there's no explicit mention in specification.
                    875:                         */
                    876:                        if (*plenp != 0) {
                    877:                                ip6stat.ip6s_badoptions++;
                    878:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    879:                                            ICMP6_PARAMPROB_HEADER,
                    880:                                            sizeof(struct ip6_hdr) +
                    881:                                            sizeof(struct ip6_hbh) +
                    882:                                            opt + 2 - opthead);
                    883:                                return(-1);
                    884:                        }
1.8       itojun    885: #endif
1.2       itojun    886:
1.22      itojun    887:                        /*
                    888:                         * jumbo payload length must be larger than 65535.
                    889:                         */
                    890:                        if (jumboplen <= IPV6_MAXPACKET) {
                    891:                                ip6stat.ip6s_badoptions++;
                    892:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    893:                                            ICMP6_PARAMPROB_HEADER,
                    894:                                            sizeof(struct ip6_hdr) +
                    895:                                            sizeof(struct ip6_hbh) +
                    896:                                            opt + 2 - opthead);
                    897:                                return(-1);
                    898:                        }
                    899:                        *plenp = jumboplen;
                    900:
                    901:                        break;
1.2       itojun    902:                 default:               /* unknown option */
                    903:                         if (hbhlen < IP6OPT_MINLEN) {
                    904:                                 ip6stat.ip6s_toosmall++;
                    905:                                 goto bad;
                    906:                         }
                    907:                         if ((optlen = ip6_unknown_opt(opt, m,
                    908:                                                       sizeof(struct ip6_hdr) +
                    909:                                                       sizeof(struct ip6_hbh) +
                    910:                                                       opt - opthead)) == -1)
                    911:                                 return(-1);
                    912:                         optlen += 2;
                    913:                         break;
                    914:                }
                    915:        }
                    916:
                    917:        return(0);
                    918:
                    919:   bad:
                    920:        m_freem(m);
                    921:        return(-1);
                    922: }
                    923:
                    924: /*
                    925:  * Unknown option processing.
                    926:  * The third argument `off' is the offset from the IPv6 header to the option,
                    927:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    928:  * is not continuous in order to return an ICMPv6 error.
                    929:  */
                    930: int
                    931: ip6_unknown_opt(optp, m, off)
                    932:        u_int8_t *optp;
                    933:        struct mbuf *m;
                    934:        int off;
                    935: {
                    936:        struct ip6_hdr *ip6;
                    937:
                    938:        switch(IP6OPT_TYPE(*optp)) {
                    939:         case IP6OPT_TYPE_SKIP: /* ignore the option */
                    940:                 return((int)*(optp + 1));
                    941:         case IP6OPT_TYPE_DISCARD:      /* silently discard */
                    942:                 m_freem(m);
                    943:                 return(-1);
                    944:         case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    945:                 ip6stat.ip6s_badoptions++;
                    946:                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
                    947:                 return(-1);
                    948:         case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    949:                 ip6stat.ip6s_badoptions++;
                    950:                 ip6 = mtod(m, struct ip6_hdr *);
                    951:                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    952:                     (m->m_flags & (M_BCAST|M_MCAST)))
                    953:                         m_freem(m);
                    954:                 else
                    955:                         icmp6_error(m, ICMP6_PARAM_PROB,
                    956:                                     ICMP6_PARAMPROB_OPTION, off);
                    957:                 return(-1);
                    958:        }
                    959:
                    960:        m_freem(m);             /* XXX: NOTREACHED */
                    961:        return(-1);
                    962: }
                    963:
                    964: /*
1.9       itojun    965:  * Create the "control" list for this pcb.
                    966:  *
                    967:  * The routine will be called from upper layer handlers like tcp6_input().
                    968:  * Thus the routine assumes that the caller (tcp6_input) have already
                    969:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                    970:  * very first mbuf on the mbuf chain.
                    971:  * We may want to add some infinite loop prevention or sanity checks for safety.
                    972:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                    973:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun    974:  */
                    975: void
                    976: ip6_savecontrol(in6p, mp, ip6, m)
                    977:        register struct in6pcb *in6p;
                    978:        register struct mbuf **mp;
                    979:        register struct ip6_hdr *ip6;
                    980:        register struct mbuf *m;
                    981: {
                    982:        struct proc *p = curproc;       /* XXX */
1.9       itojun    983:        int privileged;
1.2       itojun    984:
1.9       itojun    985:        privileged = 0;
                    986:        if (p && !suser(p->p_ucred, &p->p_acflag))
                    987:                privileged++;
                    988:
                    989: #ifdef SO_TIMESTAMP
1.2       itojun    990:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                    991:                struct timeval tv;
                    992:
                    993:                microtime(&tv);
                    994:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                    995:                        SCM_TIMESTAMP, SOL_SOCKET);
                    996:                if (*mp)
                    997:                        mp = &(*mp)->m_next;
                    998:        }
1.9       itojun    999: #endif
1.2       itojun   1000:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                   1001:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
                   1002:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
                   1003:                        IPPROTO_IPV6);
                   1004:                if (*mp)
                   1005:                        mp = &(*mp)->m_next;
                   1006:        }
                   1007:
                   1008: #ifdef noyet
                   1009:        /* options were tossed above */
                   1010:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                   1011:                /* broken */
                   1012:        /* ip6_srcroute doesn't do what we want here, need to fix */
                   1013:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                   1014:                /* broken */
                   1015: #endif
                   1016:
                   1017:        /* RFC 2292 sec. 5 */
                   1018:        if (in6p->in6p_flags & IN6P_PKTINFO) {
                   1019:                struct in6_pktinfo pi6;
                   1020:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                   1021:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                   1022:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                   1023:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                   1024:                                        ? m->m_pkthdr.rcvif->if_index
                   1025:                                        : 0;
                   1026:                *mp = sbcreatecontrol((caddr_t) &pi6,
                   1027:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
                   1028:                        IPPROTO_IPV6);
                   1029:                if (*mp)
                   1030:                        mp = &(*mp)->m_next;
                   1031:        }
                   1032:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1033:                int hlim = ip6->ip6_hlim & 0xff;
                   1034:                *mp = sbcreatecontrol((caddr_t) &hlim,
                   1035:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
                   1036:                if (*mp)
                   1037:                        mp = &(*mp)->m_next;
                   1038:        }
                   1039:        /* IN6P_NEXTHOP - for outgoing packet only */
                   1040:
                   1041:        /*
                   1042:         * IPV6_HOPOPTS socket option. We require super-user privilege
                   1043:         * for the option, but it might be too strict, since there might
                   1044:         * be some hop-by-hop options which can be returned to normal user.
                   1045:         * See RFC 2292 section 6.
                   1046:         */
1.9       itojun   1047:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun   1048:                /*
                   1049:                 * Check if a hop-by-hop options header is contatined in the
                   1050:                 * received packet, and if so, store the options as ancillary
                   1051:                 * data. Note that a hop-by-hop options header must be
                   1052:                 * just after the IPv6 header, which fact is assured through
                   1053:                 * the IPv6 input processing.
                   1054:                 */
                   1055:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1056:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1057:                        struct ip6_hbh *hbh;
                   1058:                        int hbhlen;
                   1059:
                   1060: #ifndef PULLDOWN_TEST
                   1061:                        hbh = (struct ip6_hbh *)(ip6 + 1);
                   1062:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1063: #else
                   1064:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1065:                                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                   1066:                        if (hbh == NULL) {
                   1067:                                ip6stat.ip6s_tooshort++;
                   1068:                                return;
                   1069:                        }
                   1070:                        hbhlen = (hbh->ip6h_len + 1) << 3;
                   1071:                        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                   1072:                                sizeof(struct ip6_hdr), hbhlen);
                   1073:                        if (hbh == NULL) {
                   1074:                                ip6stat.ip6s_tooshort++;
                   1075:                                return;
                   1076:                        }
                   1077: #endif
1.2       itojun   1078:
                   1079:                        /*
                   1080:                         * XXX: We copy whole the header even if a jumbo
                   1081:                         * payload option is included, which option is to
                   1082:                         * be removed before returning in the RFC 2292.
                   1083:                         * But it's too painful operation...
                   1084:                         */
1.9       itojun   1085:                        *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1.2       itojun   1086:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
                   1087:                        if (*mp)
                   1088:                                mp = &(*mp)->m_next;
                   1089:                }
                   1090:        }
                   1091:
                   1092:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1093:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                   1094:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1095:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
                   1096:
                   1097:                /*
                   1098:                 * Search for destination options headers or routing
                   1099:                 * header(s) through the header chain, and stores each
                   1100:                 * header as ancillary data.
                   1101:                 * Note that the order of the headers remains in
                   1102:                 * the chain of ancillary data.
                   1103:                 */
                   1104:                while(1) {      /* is explicit loop prevention necessary? */
1.9       itojun   1105:                        struct ip6_ext *ip6e;
                   1106:                        int elen;
                   1107:
                   1108: #ifndef PULLDOWN_TEST
                   1109:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
                   1110:                        if (nxt == IPPROTO_AH)
                   1111:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1112:                        else
                   1113:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1114: #else
                   1115:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
                   1116:                                sizeof(struct ip6_ext));
                   1117:                        if (ip6e == NULL) {
                   1118:                                ip6stat.ip6s_tooshort++;
                   1119:                                return;
                   1120:                        }
                   1121:                        if (nxt == IPPROTO_AH)
                   1122:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1123:                        else
                   1124:                                elen = (ip6e->ip6e_len + 1) << 3;
                   1125:                        IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
                   1126:                        if (ip6e == NULL) {
                   1127:                                ip6stat.ip6s_tooshort++;
                   1128:                                return;
                   1129:                        }
                   1130: #endif
1.2       itojun   1131:
                   1132:                        switch(nxt) {
                   1133:                         case IPPROTO_DSTOPTS:
                   1134:                                 if (!in6p->in6p_flags & IN6P_DSTOPTS)
                   1135:                                         break;
                   1136:
                   1137:                                 /*
                   1138:                                  * We also require super-user privilege for
                   1139:                                  * the option.
                   1140:                                  * See the comments on IN6_HOPOPTS.
                   1141:                                  */
1.9       itojun   1142:                                 if (!privileged)
1.2       itojun   1143:                                         break;
                   1144:
1.9       itojun   1145:                                 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2       itojun   1146:                                                       IPV6_DSTOPTS,
                   1147:                                                       IPPROTO_IPV6);
                   1148:                                 if (*mp)
                   1149:                                         mp = &(*mp)->m_next;
                   1150:                                 break;
                   1151:
                   1152:                         case IPPROTO_ROUTING:
                   1153:                                 if (!in6p->in6p_flags & IN6P_RTHDR)
                   1154:                                         break;
                   1155:
1.9       itojun   1156:                                 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1.2       itojun   1157:                                                       IPV6_RTHDR,
                   1158:                                                       IPPROTO_IPV6);
                   1159:                                 if (*mp)
                   1160:                                         mp = &(*mp)->m_next;
                   1161:                                 break;
                   1162:
                   1163:                         case IPPROTO_UDP:
                   1164:                         case IPPROTO_TCP:
                   1165:                         case IPPROTO_ICMPV6:
                   1166:                         default:
                   1167:                                 /*
                   1168:                                  * stop search if we encounter an upper
                   1169:                                  * layer protocol headers.
                   1170:                                  */
                   1171:                                 goto loopend;
                   1172:
                   1173:                         case IPPROTO_HOPOPTS:
                   1174:                         case IPPROTO_AH: /* is it possible? */
                   1175:                                 break;
                   1176:                        }
                   1177:
                   1178:                        /* proceed with the next header. */
1.9       itojun   1179:                        off += elen;
1.2       itojun   1180:                        nxt = ip6e->ip6e_nxt;
                   1181:                }
                   1182:          loopend:
                   1183:        }
1.9       itojun   1184:        if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1.2       itojun   1185:                /* to be done */
                   1186:        }
1.9       itojun   1187:        if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
1.2       itojun   1188:                /* to be done */
                   1189:        }
                   1190:        /* IN6P_RTHDR - to be done */
                   1191:
                   1192: }
                   1193:
                   1194: /*
                   1195:  * Get pointer to the previous header followed by the header
                   1196:  * currently processed.
                   1197:  * XXX: This function supposes that
                   1198:  *     M includes all headers,
                   1199:  *     the next header field and the header length field of each header
                   1200:  *     are valid, and
                   1201:  *     the sum of each header length equals to OFF.
                   1202:  * Because of these assumptions, this function must be called very
                   1203:  * carefully. Moreover, it will not be used in the near future when
                   1204:  * we develop `neater' mechanism to process extension headers.
                   1205:  */
                   1206: char *
                   1207: ip6_get_prevhdr(m, off)
                   1208:        struct mbuf *m;
                   1209:        int off;
                   1210: {
                   1211:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1212:
                   1213:        if (off == sizeof(struct ip6_hdr))
                   1214:                return(&ip6->ip6_nxt);
                   1215:        else {
                   1216:                int len, nxt;
                   1217:                struct ip6_ext *ip6e = NULL;
                   1218:
                   1219:                nxt = ip6->ip6_nxt;
                   1220:                len = sizeof(struct ip6_hdr);
                   1221:                while (len < off) {
                   1222:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                   1223:
                   1224:                        switch(nxt) {
                   1225:                        case IPPROTO_FRAGMENT:
                   1226:                                len += sizeof(struct ip6_frag);
                   1227:                                break;
                   1228:                        case IPPROTO_AH:
                   1229:                                len += (ip6e->ip6e_len + 2) << 2;
                   1230:                                break;
                   1231:                        default:
                   1232:                                len += (ip6e->ip6e_len + 1) << 3;
                   1233:                                break;
                   1234:                        }
                   1235:                        nxt = ip6e->ip6e_nxt;
                   1236:                }
                   1237:                if (ip6e)
                   1238:                        return(&ip6e->ip6e_nxt);
                   1239:                else
                   1240:                        return NULL;
1.18      itojun   1241:        }
                   1242: }
                   1243:
                   1244: /*
                   1245:  * get next header offset.  m will be retained.
                   1246:  */
                   1247: int
                   1248: ip6_nexthdr(m, off, proto, nxtp)
                   1249:        struct mbuf *m;
                   1250:        int off;
                   1251:        int proto;
                   1252:        int *nxtp;
                   1253: {
                   1254:        struct ip6_hdr ip6;
                   1255:        struct ip6_ext ip6e;
                   1256:        struct ip6_frag fh;
                   1257:
                   1258:        /* just in case */
                   1259:        if (m == NULL)
                   1260:                panic("ip6_nexthdr: m == NULL");
                   1261:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1262:                return -1;
                   1263:
                   1264:        switch (proto) {
                   1265:        case IPPROTO_IPV6:
                   1266:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1267:                        return -1;
                   1268:                m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
                   1269:                if (nxtp)
                   1270:                        *nxtp = ip6.ip6_nxt;
                   1271:                off += sizeof(ip6);
                   1272:                return off;
                   1273:
                   1274:        case IPPROTO_FRAGMENT:
                   1275:                /*
                   1276:                 * terminate parsing if it is not the first fragment,
                   1277:                 * it does not make sense to parse through it.
                   1278:                 */
                   1279:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1280:                        return -1;
                   1281:                m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
                   1282:                if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
                   1283:                        return -1;
                   1284:                if (nxtp)
                   1285:                        *nxtp = fh.ip6f_nxt;
                   1286:                off += sizeof(struct ip6_frag);
                   1287:                return off;
                   1288:
                   1289:        case IPPROTO_AH:
                   1290:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1291:                        return -1;
                   1292:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1293:                if (nxtp)
                   1294:                        *nxtp = ip6e.ip6e_nxt;
                   1295:                off += (ip6e.ip6e_len + 2) << 2;
                   1296:                return off;
                   1297:
                   1298:        case IPPROTO_HOPOPTS:
                   1299:        case IPPROTO_ROUTING:
                   1300:        case IPPROTO_DSTOPTS:
                   1301:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1302:                        return -1;
                   1303:                m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
                   1304:                if (nxtp)
                   1305:                        *nxtp = ip6e.ip6e_nxt;
                   1306:                off += (ip6e.ip6e_len + 1) << 3;
                   1307:                return off;
                   1308:
                   1309:        case IPPROTO_NONE:
                   1310:        case IPPROTO_ESP:
                   1311:        case IPPROTO_IPCOMP:
                   1312:                /* give up */
                   1313:                return -1;
                   1314:
                   1315:        default:
                   1316:                return -1;
                   1317:        }
                   1318:
                   1319:        return -1;
                   1320: }
                   1321:
                   1322: /*
                   1323:  * get offset for the last header in the chain.  m will be kept untainted.
                   1324:  */
                   1325: int
                   1326: ip6_lasthdr(m, off, proto, nxtp)
                   1327:        struct mbuf *m;
                   1328:        int off;
                   1329:        int proto;
                   1330:        int *nxtp;
                   1331: {
                   1332:        int newoff;
                   1333:        int nxt;
                   1334:
                   1335:        if (!nxtp) {
                   1336:                nxt = -1;
                   1337:                nxtp = &nxt;
                   1338:        }
                   1339:        while (1) {
                   1340:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1341:                if (newoff < 0)
                   1342:                        return off;
                   1343:                else if (newoff < off)
                   1344:                        return -1;      /* invalid */
                   1345:                else if (newoff == off)
                   1346:                        return newoff;
                   1347:
                   1348:                off = newoff;
                   1349:                proto = *nxtp;
1.2       itojun   1350:        }
                   1351: }
                   1352:
                   1353: /*
                   1354:  * System control for IP6
                   1355:  */
                   1356:
                   1357: u_char inet6ctlerrmap[PRC_NCMDS] = {
                   1358:        0,              0,              0,              0,
                   1359:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1360:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1361:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1362:        0,              0,              0,              0,
                   1363:        ENOPROTOOPT
                   1364: };
                   1365:
1.23      mrg      1366: #include <uvm/uvm_extern.h>
1.2       itojun   1367: #include <sys/sysctl.h>
                   1368:
                   1369: int
                   1370: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                   1371:        int *name;
                   1372:        u_int namelen;
                   1373:        void *oldp;
                   1374:        size_t *oldlenp;
                   1375:        void *newp;
                   1376:        size_t newlen;
                   1377: {
1.26      itojun   1378:        int old, error;
                   1379:
1.2       itojun   1380:        /* All sysctl names at this level are terminal. */
                   1381:        if (namelen != 1)
                   1382:                return ENOTDIR;
                   1383:
                   1384:        switch (name[0]) {
                   1385:
                   1386:        case IPV6CTL_FORWARDING:
                   1387:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1388:                                  &ip6_forwarding);
                   1389:        case IPV6CTL_SENDREDIRECTS:
                   1390:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1391:                                &ip6_sendredirects);
                   1392:        case IPV6CTL_DEFHLIM:
                   1393:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                   1394:        case IPV6CTL_MAXFRAGPACKETS:
                   1395:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1396:                                &ip6_maxfragpackets);
                   1397:        case IPV6CTL_ACCEPT_RTADV:
                   1398:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1399:                                &ip6_accept_rtadv);
                   1400:        case IPV6CTL_KEEPFAITH:
                   1401:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                   1402:        case IPV6CTL_LOG_INTERVAL:
                   1403:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1404:                                &ip6_log_interval);
                   1405:        case IPV6CTL_HDRNESTLIMIT:
                   1406:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1407:                                &ip6_hdrnestlimit);
                   1408:        case IPV6CTL_DAD_COUNT:
                   1409:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1410:        case IPV6CTL_AUTO_FLOWLABEL:
                   1411:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1412:                                &ip6_auto_flowlabel);
                   1413:        case IPV6CTL_DEFMCASTHLIM:
                   1414:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1415:                                &ip6_defmcasthlim);
                   1416:        case IPV6CTL_GIF_HLIM:
                   1417:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1418:                                &ip6_gif_hlim);
                   1419:        case IPV6CTL_KAME_VERSION:
                   1420:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
1.9       itojun   1421:        case IPV6CTL_USE_DEPRECATED:
                   1422:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1423:                                &ip6_use_deprecated);
1.10      itojun   1424:        case IPV6CTL_RR_PRUNE:
                   1425:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
1.12      itojun   1426: #ifndef INET6_BINDV6ONLY
1.11      itojun   1427:        case IPV6CTL_BINDV6ONLY:
                   1428:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1429:                                &ip6_bindv6only);
1.26      itojun   1430: #endif
                   1431:        case IPV6CTL_ANONPORTMIN:
                   1432:                old = ip6_anonportmin;
                   1433:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1434:                    &ip6_anonportmin);
                   1435:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
                   1436:                    ip6_anonportmin > 65535
                   1437: #ifndef IPNOPRIVPORTS
                   1438:                    || ip6_anonportmin < IPV6PORT_RESERVED
                   1439: #endif
                   1440:                    ) {
                   1441:                        ip6_anonportmin = old;
                   1442:                        return (EINVAL);
                   1443:                }
                   1444:                return (error);
                   1445:        case IPV6CTL_ANONPORTMAX:
                   1446:                old = ip6_anonportmax;
                   1447:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1448:                    &ip6_anonportmax);
                   1449:                if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
                   1450:                    ip6_anonportmax > 65535
                   1451: #ifndef IPNOPRIVPORTS
                   1452:                    || ip6_anonportmax < IPV6PORT_RESERVED
                   1453: #endif
                   1454:                    ) {
                   1455:                        ip6_anonportmax = old;
                   1456:                        return (EINVAL);
                   1457:                }
                   1458:                return (error);
                   1459: #ifndef IPNOPRIVPORTS
                   1460:        case IPV6CTL_LOWPORTMIN:
                   1461:                old = ip6_lowportmin;
                   1462:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1463:                    &ip6_lowportmin);
                   1464:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1465:                    ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
                   1466:                    ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
                   1467:                        ip6_lowportmin = old;
                   1468:                        return (EINVAL);
                   1469:                }
                   1470:                return (error);
                   1471:        case IPV6CTL_LOWPORTMAX:
                   1472:                old = ip6_lowportmax;
                   1473:                error = sysctl_int(oldp, oldlenp, newp, newlen,
                   1474:                    &ip6_lowportmax);
                   1475:                if (ip6_lowportmin >= ip6_lowportmax ||
                   1476:                    ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
                   1477:                    ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
                   1478:                        ip6_lowportmax = old;
                   1479:                        return (EINVAL);
                   1480:                }
                   1481:                return (error);
1.11      itojun   1482: #endif
1.2       itojun   1483:        default:
                   1484:                return EOPNOTSUPP;
                   1485:        }
                   1486:        /* NOTREACHED */
                   1487: }

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