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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.2.2.3

1.2.2.3 ! thorpej     1: /*     $NetBSD: ip6_input.c,v 1.2.2.2 1999/08/02 22:36:05 thorpej Exp $        */
        !             2:
1.2.2.2   thorpej     3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
                     32: /*
                     33:  * Copyright (c) 1982, 1986, 1988, 1993
                     34:  *     The Regents of the University of California.  All rights reserved.
                     35:  *
                     36:  * Redistribution and use in source and binary forms, with or without
                     37:  * modification, are permitted provided that the following conditions
                     38:  * are met:
                     39:  * 1. Redistributions of source code must retain the above copyright
                     40:  *    notice, this list of conditions and the following disclaimer.
                     41:  * 2. Redistributions in binary form must reproduce the above copyright
                     42:  *    notice, this list of conditions and the following disclaimer in the
                     43:  *    documentation and/or other materials provided with the distribution.
                     44:  * 3. All advertising materials mentioning features or use of this software
                     45:  *    must display the following acknowledgement:
                     46:  *     This product includes software developed by the University of
                     47:  *     California, Berkeley and its contributors.
                     48:  * 4. Neither the name of the University nor the names of its contributors
                     49:  *    may be used to endorse or promote products derived from this software
                     50:  *    without specific prior written permission.
                     51:  *
                     52:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     53:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     54:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     55:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     56:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     57:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     58:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     59:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     60:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     61:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     62:  * SUCH DAMAGE.
                     63:  *
                     64:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     65:  */
                     66:
                     67: #ifdef __FreeBSD__
                     68: #include "opt_ip6fw.h"
                     69: #endif
                     70: #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
                     71: #include "opt_inet.h"
1.2.2.3 ! thorpej    72: #ifdef __NetBSD__      /*XXX*/
        !            73: #include "opt_ipsec.h"
        !            74: #endif
1.2.2.2   thorpej    75: #endif
                     76:
                     77: #include <sys/param.h>
                     78: #include <sys/systm.h>
                     79: #include <sys/malloc.h>
                     80: #include <sys/mbuf.h>
                     81: #include <sys/domain.h>
                     82: #include <sys/protosw.h>
                     83: #include <sys/socket.h>
                     84: #include <sys/socketvar.h>
                     85: #include <sys/errno.h>
                     86: #include <sys/time.h>
                     87: #include <sys/kernel.h>
                     88: #include <sys/syslog.h>
                     89: #ifdef __NetBSD__
                     90: #include <sys/proc.h>
                     91: #endif
                     92:
                     93: #include <net/if.h>
                     94: #include <net/if_types.h>
                     95: #include <net/if_dl.h>
                     96: #include <net/route.h>
                     97: #include <net/netisr.h>
                     98:
                     99: #include <netinet/in.h>
                    100: #include <netinet6/in6_var.h>
                    101: #include <netinet/in_systm.h>
                    102: #include <netinet6/ip6.h>
                    103: #if !defined(__FreeBSD__) || __FreeBSD__ < 3
                    104: #include <netinet6/in6_pcb.h>
                    105: #else
                    106: #include <netinet/in_pcb.h>
                    107: #endif
                    108: #include <netinet6/ip6_var.h>
                    109: #include <netinet6/icmp6.h>
                    110: #include <netinet6/in6_ifattach.h>
                    111: #include <netinet6/nd6.h>
                    112:
                    113: #ifdef INET
                    114: #include <netinet/ip.h>
                    115: #include <netinet/ip_icmp.h>
                    116: #endif /*INET*/
                    117:
                    118: #include <netinet6/ip6protosw.h>
                    119:
                    120: /* we need it for NLOOP. */
                    121: #include "loop.h"
                    122: #include "faith.h"
                    123:
                    124: #include "gif.h"
                    125: #include "bpfilter.h"
                    126:
                    127: extern struct domain inet6domain;
                    128: extern struct ip6protosw inet6sw[];
                    129: #ifdef __bsdi__
                    130: extern struct ifnet loif;
                    131: #endif
                    132:
                    133: u_char ip6_protox[IPPROTO_MAX];
                    134: static int ip6qmaxlen = IFQ_MAXLEN;
                    135: struct in6_ifaddr *in6_ifaddr;
                    136: struct ifqueue ip6intrq;
                    137:
                    138: #ifdef __NetBSD__
                    139: extern struct ifnet loif[NLOOP];
                    140: int ip6_forward_srcrt;                 /* XXX */
                    141: int ip6_sourcecheck;                   /* XXX */
                    142: int ip6_sourcecheck_interval;          /* XXX */
                    143: #endif
                    144:
                    145: struct ip6stat ip6stat;
                    146:
                    147: static void ip6_init2 __P((void *));
                    148:
1.2.2.3 ! thorpej   149: static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
1.2.2.2   thorpej   150:
                    151: /*
                    152:  * IP6 initialization: fill in IP6 protocol switch table.
                    153:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    154:  */
                    155: void
                    156: ip6_init()
                    157: {
                    158:        register struct ip6protosw *pr;
                    159:        register int i;
                    160:        struct timeval tv;
                    161:
                    162:        pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
                    163:        if (pr == 0)
                    164:                panic("ip6_init");
                    165:        for (i = 0; i < IPPROTO_MAX; i++)
                    166:                ip6_protox[i] = pr - inet6sw;
                    167:        for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
                    168:            pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
                    169:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    170:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    171:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
                    172:        ip6intrq.ifq_maxlen = ip6qmaxlen;
                    173:        nd6_init();
                    174:        frag6_init();
                    175:        /*
                    176:         * in many cases, random() here does NOT return random number
                    177:         * as initialization during bootstrap time occur in fixed order.
                    178:         */
                    179:        microtime(&tv);
                    180:        ip6_flow_seq = random() ^ tv.tv_usec;
                    181:        in6_iflladdr = malloc(i, M_IFADDR, M_WAITOK);
                    182:        bzero(in6_iflladdr, i);
                    183:
                    184:        ip6_init2((void *)0);
                    185: }
                    186:
                    187: static void
                    188: ip6_init2(dummy)
                    189:        void *dummy;
                    190: {
                    191:        int i;
                    192:
                    193:        /*
                    194:         * to route local address of p2p link to loopback,
                    195:         * assign loopback address first.
                    196:         */
                    197:        for (i = 0; i < NLOOP; i++)
                    198:                in6_ifattach(&loif[i], IN6_IFT_LOOP, NULL, 0);
                    199:
                    200:        /* get EUI64 from somewhere, attach pseudo interfaces */
                    201:        if (in6_ifattach_getifid(NULL) == 0)
                    202:                in6_ifattach_p2p();
                    203:
                    204:        /* nd6_timer_init */
                    205:        timeout(nd6_timer, (caddr_t)0, hz);
                    206: }
                    207:
                    208: #ifdef __FreeBSD__
                    209: /* cheat */
                    210: SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init2, NULL);
                    211: #endif
                    212:
                    213: /*
                    214:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    215:  */
                    216: void
                    217: ip6intr()
                    218: {
                    219:        int s;
                    220:        struct mbuf *m;
                    221:
                    222:        for (;;) {
                    223:                s = splimp();
                    224:                IF_DEQUEUE(&ip6intrq, m);
                    225:                splx(s);
                    226:                if (m == 0)
                    227:                        return;
                    228:                ip6_input(m);
                    229:        }
                    230: }
                    231:
                    232: #ifdef __FreeBSD__
                    233: NETISR_SET(NETISR_IPV6, ip6intr);
                    234: #endif
                    235:
                    236: extern struct  route_in6 ip6_forward_rt;
                    237:
                    238: void
                    239: ip6_input(m)
                    240:        struct mbuf *m;
                    241: {
                    242:        register struct ip6_hdr *ip6;
                    243:        int off = sizeof(struct ip6_hdr), nest;
                    244:        u_int32_t plen;
1.2.2.3 ! thorpej   245:        u_int32_t rtalert = ~0;
1.2.2.2   thorpej   246:        int nxt, ours = 0;
                    247:
                    248: #ifdef IPSEC
                    249:        /*
                    250:         * should the inner packet be considered authentic?
                    251:         * see comment in ah4_input().
                    252:         */
                    253:        if (m) {
                    254:                m->m_flags &= ~M_AUTHIPHDR;
                    255:                m->m_flags &= ~M_AUTHIPDGM;
                    256:        }
                    257: #endif
                    258:        /*
                    259:         * mbuf statistics by kazu
                    260:         */
                    261:        if (m->m_flags & M_EXT) {
                    262:                if (m->m_next)
                    263:                        ip6stat.ip6s_mext2m++;
                    264:                else
                    265:                        ip6stat.ip6s_mext1++;
                    266:        } else {
                    267:                if (m->m_next) {
                    268:                        if (m->m_flags & M_LOOP)
                    269:                                ip6stat.ip6s_m2m[loif[0].if_index]++;   /*XXX*/
                    270:                        else if (m->m_pkthdr.rcvif->if_index <= 31)
                    271:                                ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
                    272:                        else
                    273:                                ip6stat.ip6s_m2m[0]++;
                    274:                } else
                    275:                        ip6stat.ip6s_m1++;
                    276:        }
                    277:
                    278:        IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
                    279:
                    280:        ip6stat.ip6s_total++;
                    281:
                    282:        if (m->m_len < sizeof(struct ip6_hdr) &&
                    283:            (m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
                    284:                ip6stat.ip6s_toosmall++;
                    285:                return;
                    286:        }
                    287:
                    288:        ip6 = mtod(m, struct ip6_hdr *);
                    289:
                    290:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
                    291:                ip6stat.ip6s_badvers++;
                    292:                goto bad;
                    293:        }
                    294:
                    295:        ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
                    296:
                    297:        /*
                    298:         * Scope check
                    299:         */
                    300:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    301:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
                    302:                ip6stat.ip6s_badscope++;
                    303:                goto bad;
                    304:        }
                    305:        if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
                    306:            IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
                    307:                if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    308:                        ours = 1;
                    309:                        goto hbhcheck;
                    310:                } else {
                    311:                        ip6stat.ip6s_badscope++;
                    312:                        goto bad;
                    313:                }
                    314:        }
                    315:
                    316:        if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
                    317:                if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
                    318:                        ours = 1;
                    319:                        goto hbhcheck;
                    320:                }
                    321:        } else {
                    322:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
                    323:                        ip6->ip6_src.s6_addr16[1]
                    324:                                = htons(m->m_pkthdr.rcvif->if_index);
                    325:                if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
                    326:                        ip6->ip6_dst.s6_addr16[1]
                    327:                                = htons(m->m_pkthdr.rcvif->if_index);
                    328:        }
                    329:
                    330:        /*
                    331:         * Multicast check
                    332:         */
                    333:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    334:                struct  in6_multi *in6m = 0;
                    335:                /*
                    336:                 * See if we belong to the destination multicast group on the
                    337:                 * arrival interface.
                    338:                 */
                    339:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    340:                if (in6m)
                    341:                        ours = 1;
                    342:                else if (!ip6_mrouter) {
                    343:                        ip6stat.ip6s_notmember++;
                    344:                        ip6stat.ip6s_cantforward++;
                    345:                        goto bad;
                    346:                }
                    347:                goto hbhcheck;
                    348:        }
                    349:
                    350:        /*
                    351:         *  Unicast check
                    352:         */
                    353:        if (ip6_forward_rt.ro_rt == 0 ||
                    354:            !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                    355:                                &ip6_forward_rt.ro_dst.sin6_addr)) {
                    356:                if (ip6_forward_rt.ro_rt) {
                    357:                        RTFREE(ip6_forward_rt.ro_rt);
                    358:                        ip6_forward_rt.ro_rt = 0;
                    359:                }
                    360:                bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
                    361:                ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
                    362:                ip6_forward_rt.ro_dst.sin6_family = AF_INET6;
                    363:                ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst;
                    364:
                    365: #if defined(__bsdi__) || defined(__NetBSD__)
                    366:                rtalloc((struct route *)&ip6_forward_rt);
                    367: #endif
                    368: #ifdef __FreeBSD__
                    369:                rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
                    370: #endif
                    371:        }
                    372:
                    373: #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
                    374:
                    375:        /*
                    376:         * Accept the packet if the forwarding interface to the destination
                    377:         * according to the routing table is the loopback interface,
                    378:         * unless the associated route has a gateway.
                    379:         * Note that this approach causes to accept a packet if there is a
                    380:         * route to the loopback interface for the destination of the packet.
                    381:         * But we think it's even useful in some situations, e.g. when using
                    382:         * a special daemon which wants to intercept the packet.
                    383:         */
                    384:        if (ip6_forward_rt.ro_rt &&
                    385:            (ip6_forward_rt.ro_rt->rt_flags &
                    386:             (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    387: #if 0
                    388:            /*
                    389:             * The check below is redundant since the comparison of
                    390:             * the destination and the key of the rtentry has
                    391:             * already done through looking up the routing table.
                    392:             */
                    393:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
                    394:                               &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
                    395: #endif
                    396: #ifdef __bsdi__
                    397:            ip6_foward.rt.ro_rt->rt_ifp == &loif
                    398: #else
                    399:            ip6_forward_rt.ro_rt->rt_ifp == &loif[0]
                    400: #endif
                    401:                ) {
                    402:                struct in6_ifaddr *ia6 =
                    403:                        (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
                    404:                /* packet to tentative address must not be received */
                    405:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    406:                        m->m_flags |= M_ANYCAST6;
                    407:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
                    408:                        /* this interface is ready */
                    409:                        ours = 1;
                    410:                        goto hbhcheck;
                    411:                } else {
                    412:                        /* this interface is not ready, fall through */
                    413:                }
                    414:        }
                    415:
                    416:        /*
                    417:         * FAITH(Firewall Aided Internet Translator)
                    418:         */
                    419: #if defined(NFAITH) && 0 < NFAITH
                    420:        if (ip6_keepfaith) {
                    421:                if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
                    422:                 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
                    423:                        /* XXX do we need more sanity checks? */
                    424:                        ours = 1;
                    425:                        goto hbhcheck;
                    426:                }
                    427:        }
                    428: #endif
                    429:
                    430:        /*
                    431:         * Now there is no reason to process the packet if it's not our own
                    432:         * and we're not a router.
                    433:         */
                    434:        if (!ip6_forwarding) {
                    435:                ip6stat.ip6s_cantforward++;
                    436:                goto bad;
                    437:        }
                    438:
                    439:   hbhcheck:
                    440:        /*
                    441:         * Process Hop-by-Hop options header if it's contained.
                    442:         * m may be modified in ip6_hopopts_input().
                    443:         * If a JumboPayload option is included, plen will also be modified.
                    444:         */
                    445:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    446:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
                    447:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off))
                    448:                        return; /* m have already been freed */
                    449:                /* adjust pointer */
                    450:                ip6 = mtod(m, struct ip6_hdr *);
                    451:                nxt = ((struct ip6_hbh *)(ip6 + 1))->ip6h_nxt;
                    452:
                    453:                /*
                    454:                 * accept the packet if a router alert option is included
                    455:                 * and we act as an IPv6 router.
                    456:                 */
1.2.2.3 ! thorpej   457:                if (rtalert != ~0 && ip6_forwarding)
1.2.2.2   thorpej   458:                        ours = 1;
                    459:        } else
                    460:                nxt = ip6->ip6_nxt;
                    461:
                    462:        /*
                    463:         * Check that the amount of data in the buffers
                    464:         * is as at least much as the IPv6 header would have us expect.
                    465:         * Trim mbufs if longer than we expect.
                    466:         * Drop packet if shorter than we expect.
                    467:         */
                    468:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
                    469:                ip6stat.ip6s_tooshort++;
                    470:                goto bad;
                    471:        }
                    472:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    473:                if (m->m_len == m->m_pkthdr.len) {
                    474:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    475:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    476:                } else
                    477:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    478:        }
                    479:
                    480:        /*
                    481:         * Forward if desirable.
                    482:         */
                    483:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    484:                /*
                    485:                 * If we are acting as a multicast router, all
                    486:                 * incoming multicast packets are passed to the
                    487:                 * kernel-level multicast forwarding function.
                    488:                 * The packet is returned (relatively) intact; if
                    489:                 * ip6_mforward() returns a non-zero value, the packet
                    490:                 * must be discarded, else it may be accepted below.
                    491:                 */
                    492:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
                    493:                        ip6stat.ip6s_cantforward++;
                    494:                        m_freem(m);
                    495:                        return;
                    496:                }
                    497:                if (!ours) {
                    498:                        m_freem(m);
                    499:                        return;
                    500:                }
                    501:        }
                    502:        else if (!ours) {
                    503:                ip6_forward(m, 0);
                    504:                return;
                    505:        }
                    506:
                    507:        /*
                    508:         * Tell launch routine the next header
                    509:         */
                    510:        ip6stat.ip6s_delivered++;
                    511:        nest = 0;
                    512:        while (nxt != IPPROTO_DONE) {
                    513:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
                    514:                        ip6stat.ip6s_toomanyhdr++;
                    515:                        goto bad;
                    516:                }
                    517:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    518:        }
                    519:        return;
                    520:  bad:
                    521:        m_freem(m);
                    522: }
                    523:
                    524: /*
                    525:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    526:  * included, the real payload length will be stored in plenp.
                    527:  */
                    528: static int
                    529: ip6_hopopts_input(plenp, rtalertp, mp, offp)
                    530:        u_int32_t *plenp;
1.2.2.3 ! thorpej   531:        u_int32_t *rtalertp;    /* XXX: should be stored more smart way */
1.2.2.2   thorpej   532:        struct mbuf **mp;
                    533:        int *offp;
                    534: {
                    535:        register struct mbuf *m = *mp;
                    536:        int off = *offp, hbhlen;
                    537:        struct ip6_hbh *hbh;
                    538:        u_int8_t *opt;
                    539:
                    540:        /* validation of the length of the header */
                    541:        IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
                    542:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    543:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    544:
                    545:        IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
                    546:        hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
                    547:        off += hbhlen;
                    548:        hbhlen -= sizeof(struct ip6_hbh);
                    549:        opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
                    550:
                    551:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    552:                                hbhlen, rtalertp, plenp) < 0)
                    553:                return(-1);
                    554:
                    555:        *offp = off;
                    556:        *mp = m;
                    557:        return(0);
                    558: }
                    559:
                    560: /*
                    561:  * Search header for all Hop-by-hop options and process each option.
                    562:  * This function is separate from ip6_hopopts_input() in order to
                    563:  * handle a case where the sending node itself process its hop-by-hop
                    564:  * options header. In such a case, the function is called from ip6_output().
                    565:  */
                    566: int
                    567: ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
                    568:        struct mbuf *m;
                    569:        u_int8_t *opthead;
                    570:        int hbhlen;
1.2.2.3 ! thorpej   571:        u_int32_t *rtalertp;
1.2.2.2   thorpej   572:        u_int32_t *plenp;
                    573: {
                    574:        struct ip6_hdr *ip6;
                    575:        int optlen = 0;
                    576:        u_int8_t *opt = opthead;
                    577:        u_int16_t rtalert_val;
                    578:
                    579:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
                    580:                switch(*opt) {
                    581:                 case IP6OPT_PAD1:
                    582:                         optlen = 1;
                    583:                         break;
                    584:                 case IP6OPT_PADN:
                    585:                         if (hbhlen < IP6OPT_MINLEN) {
                    586:                                 ip6stat.ip6s_toosmall++;
                    587:                                 goto bad;
                    588:                         }
                    589:                         optlen = *(opt + 1) + 2;
                    590:                         break;
                    591:                 case IP6OPT_RTALERT:
                    592:                         if (hbhlen < IP6OPT_RTALERT_LEN) {
                    593:                                 ip6stat.ip6s_toosmall++;
                    594:                                 goto bad;
                    595:                         }
                    596:                         if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2)
                    597:                                  /* XXX: should we discard the packet? */
                    598:                                 log(LOG_ERR, "length of router alert opt is inconsitent(%d)",
                    599:                                     *(opt + 1));
                    600:                         optlen = IP6OPT_RTALERT_LEN;
                    601:                         bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
                    602:                         *rtalertp = ntohs(rtalert_val);
                    603:                         break;
                    604:                 case IP6OPT_JUMBO:
                    605:                         if (hbhlen < IP6OPT_JUMBO_LEN) {
                    606:                                 ip6stat.ip6s_toosmall++;
                    607:                                 goto bad;
                    608:                         }
                    609:                         if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2)
                    610:                                  /* XXX: should we discard the packet? */
                    611:                                 log(LOG_ERR, "length of jumbopayload opt "
                    612:                                     "is inconsistent(%d)",
                    613:                                     *(opt + 1));
                    614:                         optlen = IP6OPT_JUMBO_LEN;
                    615:
                    616:                         /*
                    617:                          * We can simply cast because of the alignment
                    618:                          * requirement of the jumbo payload option.
                    619:                          */
                    620:                         *plenp = ntohl(*(u_int32_t *)(opt + 2));
                    621:                         if (*plenp <= IPV6_MAXPACKET) {
                    622:                                 /*
                    623:                                  * jumbo payload length must be larger
                    624:                                  * than 65535
                    625:                                  */
                    626:                                 ip6stat.ip6s_badoptions++;
                    627:                                 icmp6_error(m, ICMP6_PARAM_PROB,
                    628:                                             ICMP6_PARAMPROB_HEADER,
                    629:                                             sizeof(struct ip6_hdr) +
                    630:                                             sizeof(struct ip6_hbh) +
                    631:                                             opt + 2 - opthead);
                    632:                                 return(-1);
                    633:                         }
                    634:
                    635:                         ip6 = mtod(m, struct ip6_hdr *);
                    636:                         if (ip6->ip6_plen) {
                    637:                                 /*
                    638:                                  * IPv6 packets that have non 0 payload length
                    639:                                  * must not contain a jumbo paylod option.
                    640:                                  */
                    641:                                 ip6stat.ip6s_badoptions++;
                    642:                                 icmp6_error(m, ICMP6_PARAM_PROB,
                    643:                                             ICMP6_PARAMPROB_HEADER,
                    644:                                             sizeof(struct ip6_hdr) +
                    645:                                             sizeof(struct ip6_hbh) +
                    646:                                             opt - opthead);
                    647:                                 return(-1);
                    648:                         }
                    649:                         break;
                    650:                 default:               /* unknown option */
                    651:                         if (hbhlen < IP6OPT_MINLEN) {
                    652:                                 ip6stat.ip6s_toosmall++;
                    653:                                 goto bad;
                    654:                         }
                    655:                         if ((optlen = ip6_unknown_opt(opt, m,
                    656:                                                       sizeof(struct ip6_hdr) +
                    657:                                                       sizeof(struct ip6_hbh) +
                    658:                                                       opt - opthead)) == -1)
                    659:                                 return(-1);
                    660:                         optlen += 2;
                    661:                         break;
                    662:                }
                    663:        }
                    664:
                    665:        return(0);
                    666:
                    667:   bad:
                    668:        m_freem(m);
                    669:        return(-1);
                    670: }
                    671:
                    672: /*
                    673:  * Unknown option processing.
                    674:  * The third argument `off' is the offset from the IPv6 header to the option,
                    675:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    676:  * is not continuous in order to return an ICMPv6 error.
                    677:  */
                    678: int
                    679: ip6_unknown_opt(optp, m, off)
                    680:        u_int8_t *optp;
                    681:        struct mbuf *m;
                    682:        int off;
                    683: {
                    684:        struct ip6_hdr *ip6;
                    685:
                    686:        switch(IP6OPT_TYPE(*optp)) {
                    687:         case IP6OPT_TYPE_SKIP: /* ignore the option */
                    688:                 return((int)*(optp + 1));
                    689:         case IP6OPT_TYPE_DISCARD:      /* silently discard */
                    690:                 m_freem(m);
                    691:                 return(-1);
                    692:         case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
                    693:                 ip6stat.ip6s_badoptions++;
                    694:                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
                    695:                 return(-1);
                    696:         case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
                    697:                 ip6stat.ip6s_badoptions++;
                    698:                 ip6 = mtod(m, struct ip6_hdr *);
                    699:                 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                    700:                     (m->m_flags & (M_BCAST|M_MCAST)))
                    701:                         m_freem(m);
                    702:                 else
                    703:                         icmp6_error(m, ICMP6_PARAM_PROB,
                    704:                                     ICMP6_PARAMPROB_OPTION, off);
                    705:                 return(-1);
                    706:        }
                    707:
                    708:        m_freem(m);             /* XXX: NOTREACHED */
                    709:        return(-1);
                    710: }
                    711:
                    712: /*
                    713:  * Create the "control" list for this pcb
                    714:  */
                    715: void
                    716: ip6_savecontrol(in6p, mp, ip6, m)
                    717:        register struct in6pcb *in6p;
                    718:        register struct mbuf **mp;
                    719:        register struct ip6_hdr *ip6;
                    720:        register struct mbuf *m;
                    721: {
                    722: #ifdef __NetBSD__
                    723:        struct proc *p = curproc;       /* XXX */
                    724: #endif
                    725: #ifdef __bsdi__
                    726: # define sbcreatecontrol       so_cmsg
                    727: #endif
                    728:
                    729:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
                    730:                struct timeval tv;
                    731:
                    732:                microtime(&tv);
                    733:                *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
                    734:                        SCM_TIMESTAMP, SOL_SOCKET);
                    735:                if (*mp)
                    736:                        mp = &(*mp)->m_next;
                    737:        }
                    738:        if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
                    739:                *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
                    740:                        sizeof(struct in6_addr), IPV6_RECVDSTADDR,
                    741:                        IPPROTO_IPV6);
                    742:                if (*mp)
                    743:                        mp = &(*mp)->m_next;
                    744:        }
                    745:
                    746: #ifdef noyet
                    747:        /* options were tossed above */
                    748:        if (in6p->in6p_flags & IN6P_RECVOPTS)
                    749:                /* broken */
                    750:        /* ip6_srcroute doesn't do what we want here, need to fix */
                    751:        if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
                    752:                /* broken */
                    753: #endif
                    754:
                    755:        /* RFC 2292 sec. 5 */
                    756:        if (in6p->in6p_flags & IN6P_PKTINFO) {
                    757:                struct in6_pktinfo pi6;
                    758:                bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
                    759:                if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
                    760:                        pi6.ipi6_addr.s6_addr16[1] = 0;
                    761:                pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
                    762:                                        ? m->m_pkthdr.rcvif->if_index
                    763:                                        : 0;
                    764:                *mp = sbcreatecontrol((caddr_t) &pi6,
                    765:                        sizeof(struct in6_pktinfo), IPV6_PKTINFO,
                    766:                        IPPROTO_IPV6);
                    767:                if (*mp)
                    768:                        mp = &(*mp)->m_next;
                    769:        }
                    770:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                    771:                int hlim = ip6->ip6_hlim & 0xff;
                    772:                *mp = sbcreatecontrol((caddr_t) &hlim,
                    773:                        sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
                    774:                if (*mp)
                    775:                        mp = &(*mp)->m_next;
                    776:        }
                    777:        /* IN6P_NEXTHOP - for outgoing packet only */
                    778:
                    779:        /*
                    780:         * IPV6_HOPOPTS socket option. We require super-user privilege
                    781:         * for the option, but it might be too strict, since there might
                    782:         * be some hop-by-hop options which can be returned to normal user.
                    783:         * See RFC 2292 section 6.
                    784:         */
                    785:        if ((in6p->in6p_flags & IN6P_HOPOPTS) &&
                    786:            p && !suser(p->p_ucred, &p->p_acflag)) {
                    787:                /*
                    788:                 * Check if a hop-by-hop options header is contatined in the
                    789:                 * received packet, and if so, store the options as ancillary
                    790:                 * data. Note that a hop-by-hop options header must be
                    791:                 * just after the IPv6 header, which fact is assured through
                    792:                 * the IPv6 input processing.
                    793:                 */
                    794:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                    795:                if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
                    796:                        struct ip6_hbh *hbh = (struct ip6_hbh *)(ip6 + 1);
                    797:
                    798:                        /*
                    799:                         * XXX: We copy whole the header even if a jumbo
                    800:                         * payload option is included, which option is to
                    801:                         * be removed before returning in the RFC 2292.
                    802:                         * But it's too painful operation...
                    803:                         */
                    804:                        *mp = sbcreatecontrol((caddr_t)hbh,
                    805:                                              (hbh->ip6h_len + 1) << 3,
                    806:                                              IPV6_HOPOPTS, IPPROTO_IPV6);
                    807:                        if (*mp)
                    808:                                mp = &(*mp)->m_next;
                    809:                }
                    810:        }
                    811:
                    812:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                    813:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
                    814:                struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                    815:                int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);;
                    816:
                    817:                /*
                    818:                 * Search for destination options headers or routing
                    819:                 * header(s) through the header chain, and stores each
                    820:                 * header as ancillary data.
                    821:                 * Note that the order of the headers remains in
                    822:                 * the chain of ancillary data.
                    823:                 */
                    824:                while(1) {      /* is explicit loop prevention necessary? */
                    825:                        struct ip6_ext *ip6e =
                    826:                                (struct ip6_ext *)(mtod(m, caddr_t) + off);
                    827:
                    828:                        switch(nxt) {
                    829:                         case IPPROTO_DSTOPTS:
                    830:                                 if (!in6p->in6p_flags & IN6P_DSTOPTS)
                    831:                                         break;
                    832:
                    833:                                 /*
                    834:                                  * We also require super-user privilege for
                    835:                                  * the option.
                    836:                                  * See the comments on IN6_HOPOPTS.
                    837:                                  */
                    838:                                 if (!p || !suser(p->p_ucred, &p->p_acflag))
                    839:                                         break;
                    840:
                    841:                                 *mp = sbcreatecontrol((caddr_t)ip6e,
                    842:                                                       (ip6e->ip6e_len + 1) << 3,
                    843:                                                       IPV6_DSTOPTS,
                    844:                                                       IPPROTO_IPV6);
                    845:                                 if (*mp)
                    846:                                         mp = &(*mp)->m_next;
                    847:                                 break;
                    848:
                    849:                         case IPPROTO_ROUTING:
                    850:                                 if (!in6p->in6p_flags & IN6P_RTHDR)
                    851:                                         break;
                    852:
                    853:                                 *mp = sbcreatecontrol((caddr_t)ip6e,
                    854:                                                       (ip6e->ip6e_len + 1) << 3,
                    855:                                                       IPV6_RTHDR,
                    856:                                                       IPPROTO_IPV6);
                    857:                                 if (*mp)
                    858:                                         mp = &(*mp)->m_next;
                    859:                                 break;
                    860:
                    861:                         case IPPROTO_UDP:
                    862:                         case IPPROTO_TCP:
                    863:                         case IPPROTO_ICMPV6:
                    864:                         default:
                    865:                                 /*
                    866:                                  * stop search if we encounter an upper
                    867:                                  * layer protocol headers.
                    868:                                  */
                    869:                                 goto loopend;
                    870:
                    871:                         case IPPROTO_HOPOPTS:
                    872:                         case IPPROTO_AH: /* is it possible? */
                    873:                                 break;
                    874:                        }
                    875:
                    876:                        /* proceed with the next header. */
                    877:                        if (nxt == IPPROTO_AH)
                    878:                                off += (ip6e->ip6e_len + 2) << 2;
                    879:                        else
                    880:                                off += (ip6e->ip6e_len + 1) << 3;
                    881:                        nxt = ip6e->ip6e_nxt;
                    882:                }
                    883:          loopend:
                    884:        }
                    885:        if ((in6p->in6p_flags & IN6P_HOPOPTS)
                    886:         && p && !suser(p->p_ucred, &p->p_acflag)) {
                    887:                /* to be done */
                    888:        }
                    889:        if ((in6p->in6p_flags & IN6P_DSTOPTS)
                    890:         && p && !suser(p->p_ucred, &p->p_acflag)) {
                    891:                /* to be done */
                    892:        }
                    893:        /* IN6P_RTHDR - to be done */
                    894:
                    895: #ifdef __bsdi__
                    896: # undef sbcreatecontrol
                    897: #endif
                    898: }
                    899:
                    900: /*
                    901:  * Get pointer to the previous header followed by the header
                    902:  * currently processed.
                    903:  * XXX: This function supposes that
                    904:  *     M includes all headers,
                    905:  *     the next header field and the header length field of each header
                    906:  *     are valid, and
                    907:  *     the sum of each header length equals to OFF.
                    908:  * Because of these assumptions, this function must be called very
                    909:  * carefully. Moreover, it will not be used in the near future when
                    910:  * we develop `neater' mechanism to process extension headers.
                    911:  */
                    912: char *
                    913: ip6_get_prevhdr(m, off)
                    914:        struct mbuf *m;
                    915:        int off;
                    916: {
                    917:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                    918:
                    919:        if (off == sizeof(struct ip6_hdr))
                    920:                return(&ip6->ip6_nxt);
                    921:        else {
                    922:                int len, nxt;
                    923:                struct ip6_ext *ip6e = NULL;
                    924:
                    925:                nxt = ip6->ip6_nxt;
                    926:                len = sizeof(struct ip6_hdr);
                    927:                while (len < off) {
                    928:                        ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
                    929:
                    930:                        switch(nxt) {
                    931:                        case IPPROTO_FRAGMENT:
                    932:                                len += sizeof(struct ip6_frag);
                    933:                                break;
                    934:                        case IPPROTO_AH:
                    935:                                len += (ip6e->ip6e_len + 2) << 2;
                    936:                                break;
                    937:                        default:
                    938:                                len += (ip6e->ip6e_len + 1) << 3;
                    939:                                break;
                    940:                        }
                    941:                        nxt = ip6e->ip6e_nxt;
                    942:                }
                    943:                if (ip6e)
                    944:                        return(&ip6e->ip6e_nxt);
                    945:                else
                    946:                        return NULL;
                    947:        }
                    948: }
                    949:
                    950: /*
                    951:  * System control for IP6
                    952:  */
                    953:
                    954: u_char inet6ctlerrmap[PRC_NCMDS] = {
                    955:        0,              0,              0,              0,
                    956:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                    957:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                    958:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                    959:        0,              0,              0,              0,
                    960:        ENOPROTOOPT
                    961: };
                    962:
                    963: #ifdef __NetBSD__
                    964: #include <vm/vm.h>
                    965: #include <sys/sysctl.h>
                    966:
                    967: int
                    968: ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
                    969:        int *name;
                    970:        u_int namelen;
                    971:        void *oldp;
                    972:        size_t *oldlenp;
                    973:        void *newp;
                    974:        size_t newlen;
                    975: {
                    976:        /* All sysctl names at this level are terminal. */
                    977:        if (namelen != 1)
                    978:                return ENOTDIR;
                    979:
                    980:        switch (name[0]) {
                    981:
                    982:        case IPV6CTL_FORWARDING:
                    983:                return sysctl_int(oldp, oldlenp, newp, newlen,
                    984:                                  &ip6_forwarding);
                    985:        case IPV6CTL_SENDREDIRECTS:
                    986:                return sysctl_int(oldp, oldlenp, newp, newlen,
                    987:                                &ip6_sendredirects);
                    988:        case IPV6CTL_DEFHLIM:
                    989:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
                    990:        case IPV6CTL_MAXFRAGPACKETS:
                    991:                return sysctl_int(oldp, oldlenp, newp, newlen,
                    992:                                &ip6_maxfragpackets);
                    993:        case IPV6CTL_ACCEPT_RTADV:
                    994:                return sysctl_int(oldp, oldlenp, newp, newlen,
                    995:                                &ip6_accept_rtadv);
                    996:        case IPV6CTL_KEEPFAITH:
                    997:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
                    998:        case IPV6CTL_LOG_INTERVAL:
                    999:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1000:                                &ip6_log_interval);
                   1001:        case IPV6CTL_HDRNESTLIMIT:
                   1002:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1003:                                &ip6_hdrnestlimit);
                   1004:        case IPV6CTL_DAD_COUNT:
                   1005:                return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
                   1006:        case IPV6CTL_AUTO_FLOWLABEL:
                   1007:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1008:                                &ip6_auto_flowlabel);
                   1009:        case IPV6CTL_DEFMCASTHLIM:
                   1010:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1011:                                &ip6_defmcasthlim);
                   1012:        case IPV6CTL_GIF_HLIM:
                   1013:                return sysctl_int(oldp, oldlenp, newp, newlen,
                   1014:                                &ip6_gif_hlim);
                   1015:        case IPV6CTL_KAME_VERSION:
                   1016:                return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
                   1017:        default:
                   1018:                return EOPNOTSUPP;
                   1019:        }
                   1020:        /* NOTREACHED */
                   1021: }
                   1022: #endif /* __NetBSD__ */

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