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Annotation of src/sys/netinet6/ip6_input.c, Revision 1.149.4.2

1.149.4.2! skrll       1: /*     $NetBSD: ip6_input.c,v 1.149.4.1 2015/04/06 15:18:23 skrll Exp $        */
1.40      itojun      2: /*     $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $     */
1.3       thorpej     3:
1.2       itojun      4: /*
                      5:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      6:  * All rights reserved.
1.21      itojun      7:  *
1.2       itojun      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the project nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
1.21      itojun     19:  *
1.2       itojun     20:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: /*
                     34:  * Copyright (c) 1982, 1986, 1988, 1993
                     35:  *     The Regents of the University of California.  All rights reserved.
                     36:  *
                     37:  * Redistribution and use in source and binary forms, with or without
                     38:  * modification, are permitted provided that the following conditions
                     39:  * are met:
                     40:  * 1. Redistributions of source code must retain the above copyright
                     41:  *    notice, this list of conditions and the following disclaimer.
                     42:  * 2. Redistributions in binary form must reproduce the above copyright
                     43:  *    notice, this list of conditions and the following disclaimer in the
                     44:  *    documentation and/or other materials provided with the distribution.
1.65      agc        45:  * 3. Neither the name of the University nor the names of its contributors
1.2       itojun     46:  *    may be used to endorse or promote products derived from this software
                     47:  *    without specific prior written permission.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     50:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     51:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     52:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     53:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     54:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     55:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     56:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     57:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     58:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     59:  * SUCH DAMAGE.
                     60:  *
                     61:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
                     62:  */
1.48      lukem      63:
                     64: #include <sys/cdefs.h>
1.149.4.2! skrll      65: __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.149.4.1 2015/04/06 15:18:23 skrll Exp $");
1.2       itojun     66:
1.149.4.2! skrll      67: #ifdef _KERNEL_OPT
1.129     joerg      68: #include "opt_gateway.h"
1.2       itojun     69: #include "opt_inet.h"
1.85      rpaulo     70: #include "opt_inet6.h"
1.4       thorpej    71: #include "opt_ipsec.h"
1.123     christos   72: #include "opt_compat_netbsd.h"
1.149.4.2! skrll      73: #endif
1.2       itojun     74:
                     75: #include <sys/param.h>
                     76: #include <sys/systm.h>
                     77: #include <sys/malloc.h>
                     78: #include <sys/mbuf.h>
                     79: #include <sys/domain.h>
                     80: #include <sys/protosw.h>
                     81: #include <sys/socket.h>
                     82: #include <sys/socketvar.h>
                     83: #include <sys/errno.h>
                     84: #include <sys/time.h>
                     85: #include <sys/kernel.h>
                     86: #include <sys/syslog.h>
                     87: #include <sys/proc.h>
1.46      simonb     88: #include <sys/sysctl.h>
1.133     tls        89: #include <sys/cprng.h>
1.2       itojun     90:
                     91: #include <net/if.h>
                     92: #include <net/if_types.h>
                     93: #include <net/if_dl.h>
                     94: #include <net/route.h>
1.148     rmind      95: #include <net/pktqueue.h>
1.15      darrenr    96: #include <net/pfil.h>
1.2       itojun     97:
                     98: #include <netinet/in.h>
1.9       itojun     99: #include <netinet/in_systm.h>
                    100: #ifdef INET
                    101: #include <netinet/ip.h>
1.148     rmind     102: #include <netinet/ip_var.h>
1.9       itojun    103: #include <netinet/ip_icmp.h>
1.45      itojun    104: #endif /* INET */
1.14      itojun    105: #include <netinet/ip6.h>
1.140     christos  106: #include <netinet/portalgo.h>
1.2       itojun    107: #include <netinet6/in6_var.h>
1.11      itojun    108: #include <netinet6/ip6_var.h>
1.116     thorpej   109: #include <netinet6/ip6_private.h>
1.2       itojun    110: #include <netinet6/in6_pcb.h>
1.14      itojun    111: #include <netinet/icmp6.h>
1.81      rpaulo    112: #include <netinet6/scope6_var.h>
1.2       itojun    113: #include <netinet6/in6_ifattach.h>
                    114: #include <netinet6/nd6.h>
                    115:
1.142     christos  116: #ifdef IPSEC
1.94      degroote  117: #include <netipsec/ipsec.h>
                    118: #include <netipsec/ipsec6.h>
                    119: #include <netipsec/key.h>
1.142     christos  120: #endif /* IPSEC */
1.94      degroote  121:
1.123     christos  122: #ifdef COMPAT_50
                    123: #include <compat/sys/time.h>
                    124: #include <compat/sys/socket.h>
                    125: #endif
                    126:
1.2       itojun    127: #include <netinet6/ip6protosw.h>
                    128:
                    129: #include "faith.h"
                    130: #include "gif.h"
1.50      itojun    131:
                    132: #if NGIF > 0
                    133: #include <netinet6/in6_gif.h>
                    134: #endif
1.2       itojun    135:
1.9       itojun    136: #include <net/net_osdep.h>
                    137:
1.2       itojun    138: extern struct domain inet6domain;
                    139:
                    140: u_char ip6_protox[IPPROTO_MAX];
                    141: struct in6_ifaddr *in6_ifaddr;
1.148     rmind     142: pktqueue_t *ip6_pktq __read_mostly;
1.2       itojun    143:
1.108     ad        144: extern callout_t in6_tmpaddrtimer_ch;
1.83      rpaulo    145:
1.2       itojun    146: int ip6_forward_srcrt;                 /* XXX */
                    147: int ip6_sourcecheck;                   /* XXX */
                    148: int ip6_sourcecheck_interval;          /* XXX */
1.9       itojun    149:
1.143     rmind     150: pfil_head_t *inet6_pfil_hook;
1.29      thorpej   151:
1.116     thorpej   152: percpu_t *ip6stat_percpu;
1.2       itojun    153:
1.111     dyoung    154: static void ip6_init2(void *);
1.148     rmind     155: static void ip6intr(void *);
1.112     dyoung    156: static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
1.2       itojun    157:
1.136     drochner  158: static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
                    159:        u_int32_t *);
1.111     dyoung    160: static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
1.128     pooka     161: static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
1.2       itojun    162:
                    163: /*
                    164:  * IP6 initialization: fill in IP6 protocol switch table.
                    165:  * All protocols not implemented in kernel go to raw IP6 protocol handler.
                    166:  */
                    167: void
1.114     matt      168: ip6_init(void)
1.2       itojun    169: {
1.78      christos  170:        const struct ip6protosw *pr;
1.35      itojun    171:        int i;
1.2       itojun    172:
1.128     pooka     173:        sysctl_net_inet6_ip6_setup(NULL);
1.78      christos  174:        pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
1.2       itojun    175:        if (pr == 0)
                    176:                panic("ip6_init");
                    177:        for (i = 0; i < IPPROTO_MAX; i++)
                    178:                ip6_protox[i] = pr - inet6sw;
1.78      christos  179:        for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
                    180:            pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
1.2       itojun    181:                if (pr->pr_domain->dom_family == PF_INET6 &&
                    182:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
                    183:                        ip6_protox[pr->pr_protocol] = pr - inet6sw;
1.148     rmind     184:
1.149     ozaki-r   185:        ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL);
1.148     rmind     186:        KASSERT(ip6_pktq != NULL);
                    187:
1.81      rpaulo    188:        scope6_init();
                    189:        addrsel_policy_init();
1.2       itojun    190:        nd6_init();
                    191:        frag6_init();
1.133     tls       192:        ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR;
1.2       itojun    193:
1.135     christos  194:        ip6_init2(NULL);
1.98      liamjfoy  195: #ifdef GATEWAY
1.99      liamjfoy  196:        ip6flow_init(ip6_hashsize);
1.98      liamjfoy  197: #endif
1.29      thorpej   198:        /* Register our Packet Filter hook. */
1.143     rmind     199:        inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6);
                    200:        KASSERT(inet6_pfil_hook != NULL);
1.116     thorpej   201:
                    202:        ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
1.2       itojun    203: }
                    204:
                    205: static void
1.90      christos  206: ip6_init2(void *dummy)
1.2       itojun    207: {
                    208:
                    209:        /* nd6_timer_init */
1.118     ad        210:        callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
1.19      thorpej   211:        callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
1.83      rpaulo    212:
                    213:        /* timer for regeneranation of temporary addresses randomize ID */
1.118     ad        214:        callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
1.83      rpaulo    215:        callout_reset(&in6_tmpaddrtimer_ch,
                    216:                      (ip6_temp_preferred_lifetime - ip6_desync_factor -
                    217:                       ip6_temp_regen_advance) * hz,
                    218:                      in6_tmpaddrtimer, NULL);
1.2       itojun    219: }
                    220:
                    221: /*
                    222:  * IP6 input interrupt handling. Just pass the packet to ip6_input.
                    223:  */
1.148     rmind     224: static void
                    225: ip6intr(void *arg __unused)
1.2       itojun    226: {
                    227:        struct mbuf *m;
                    228:
1.118     ad        229:        mutex_enter(softnet_lock);
1.148     rmind     230:        while ((m = pktq_dequeue(ip6_pktq)) != NULL) {
                    231:                const ifnet_t *ifp = m->m_pkthdr.rcvif;
                    232:
                    233:                /*
                    234:                 * Drop the packet if IPv6 is disabled on the interface.
                    235:                 */
                    236:                if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
1.83      rpaulo    237:                        m_freem(m);
1.148     rmind     238:                        continue;
1.83      rpaulo    239:                }
1.2       itojun    240:                ip6_input(m);
                    241:        }
1.118     ad        242:        mutex_exit(softnet_lock);
1.2       itojun    243: }
                    244:
1.103     dyoung    245: extern struct  route ip6_forward_rt;
1.2       itojun    246:
                    247: void
1.96      dyoung    248: ip6_input(struct mbuf *m)
1.2       itojun    249: {
1.9       itojun    250:        struct ip6_hdr *ip6;
1.105     dyoung    251:        int hit, off = sizeof(struct ip6_hdr), nest;
1.2       itojun    252:        u_int32_t plen;
1.5       itojun    253:        u_int32_t rtalert = ~0;
1.104     yamt      254:        int nxt, ours = 0, rh_present = 0;
1.9       itojun    255:        struct ifnet *deliverifp = NULL;
1.64      itojun    256:        int srcrt = 0;
1.105     dyoung    257:        const struct rtentry *rt;
                    258:        union {
                    259:                struct sockaddr         dst;
                    260:                struct sockaddr_in6     dst6;
                    261:        } u;
1.2       itojun    262:
                    263:        /*
1.81      rpaulo    264:         * make sure we don't have onion peering information into m_tag.
                    265:         */
                    266:        ip6_delaux(m);
                    267:
                    268:        /*
1.44      itojun    269:         * mbuf statistics
1.2       itojun    270:         */
                    271:        if (m->m_flags & M_EXT) {
                    272:                if (m->m_next)
1.116     thorpej   273:                        IP6_STATINC(IP6_STAT_MEXT2M);
1.2       itojun    274:                else
1.116     thorpej   275:                        IP6_STATINC(IP6_STAT_MEXT1);
1.2       itojun    276:        } else {
1.115     thorpej   277: #define M2MMAX 32
1.2       itojun    278:                if (m->m_next) {
1.9       itojun    279:                        if (m->m_flags & M_LOOP) {
1.116     thorpej   280:                        /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
1.115     thorpej   281:                        } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
1.116     thorpej   282:                                IP6_STATINC(IP6_STAT_M2M +
                    283:                                            m->m_pkthdr.rcvif->if_index);
1.115     thorpej   284:                        } else
1.116     thorpej   285:                                IP6_STATINC(IP6_STAT_M2M);
1.2       itojun    286:                } else
1.116     thorpej   287:                        IP6_STATINC(IP6_STAT_M1);
1.40      itojun    288: #undef M2MMAX
1.2       itojun    289:        }
                    290:
1.9       itojun    291:        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
1.116     thorpej   292:        IP6_STATINC(IP6_STAT_TOTAL);
1.9       itojun    293:
1.57      thorpej   294:        /*
                    295:         * If the IPv6 header is not aligned, slurp it up into a new
                    296:         * mbuf with space for link headers, in the event we forward
1.81      rpaulo    297:         * it.  Otherwise, if it is aligned, make sure the entire base
1.57      thorpej   298:         * IPv6 header is in the first mbuf of the chain.
                    299:         */
1.97      christos  300:        if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.57      thorpej   301:                struct ifnet *inifp = m->m_pkthdr.rcvif;
                    302:                if ((m = m_copyup(m, sizeof(struct ip6_hdr),
                    303:                                  (max_linkhdr + 3) & ~3)) == NULL) {
                    304:                        /* XXXJRT new stat, please */
1.116     thorpej   305:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.57      thorpej   306:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    307:                        return;
                    308:                }
                    309:        } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
                    310:                struct ifnet *inifp = m->m_pkthdr.rcvif;
1.55      itojun    311:                if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
1.116     thorpej   312:                        IP6_STATINC(IP6_STAT_TOOSMALL);
1.9       itojun    313:                        in6_ifstat_inc(inifp, ifs6_in_hdrerr);
                    314:                        return;
                    315:                }
1.2       itojun    316:        }
                    317:
                    318:        ip6 = mtod(m, struct ip6_hdr *);
                    319:
                    320:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1.116     thorpej   321:                IP6_STATINC(IP6_STAT_BADVERS);
1.9       itojun    322:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    323:                goto bad;
                    324:        }
1.15      darrenr   325:
1.98      liamjfoy  326:        /*
                    327:         * Assume that we can create a fast-forward IP flow entry
                    328:         * based on this packet.
                    329:         */
                    330:        m->m_flags |= M_CANFASTFWD;
                    331:
1.15      darrenr   332:        /*
                    333:         * Run through list of hooks for input packets.  If there are any
                    334:         * filters which require that additional packets in the flow are
                    335:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    336:         * Note that filters must _never_ set this flag, as another filter
                    337:         * in the list may have previously cleared it.
                    338:         */
1.39      itojun    339:        /*
                    340:         * let ipfilter look at packet on the wire,
                    341:         * not the decapsulated packet.
                    342:         */
1.142     christos  343: #if defined(IPSEC)
1.146     christos  344:        if (!ipsec_used || !ipsec_indone(m))
1.39      itojun    345: #else
                    346:        if (1)
                    347: #endif
                    348:        {
1.64      itojun    349:                struct in6_addr odst;
                    350:
                    351:                odst = ip6->ip6_dst;
1.143     rmind     352:                if (pfil_run_hooks(inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
1.39      itojun    353:                                   PFIL_IN) != 0)
                    354:                        return;
                    355:                if (m == NULL)
                    356:                        return;
                    357:                ip6 = mtod(m, struct ip6_hdr *);
1.64      itojun    358:                srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
1.39      itojun    359:        }
1.15      darrenr   360:
1.116     thorpej   361:        IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
1.2       itojun    362:
1.30      thorpej   363: #ifdef ALTQ
                    364:        if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
                    365:                /* packet is dropped by traffic conditioner */
                    366:                return;
1.9       itojun    367:        }
                    368: #endif
                    369:
1.2       itojun    370:        /*
1.44      itojun    371:         * Check against address spoofing/corruption.
1.2       itojun    372:         */
                    373:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
                    374:            IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
1.55      itojun    375:                /*
                    376:                 * XXX: "badscope" is not very suitable for a multicast source.
                    377:                 */
1.116     thorpej   378:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.9       itojun    379:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
1.2       itojun    380:                goto bad;
                    381:        }
1.13      itojun    382:        /*
1.44      itojun    383:         * The following check is not documented in specs.  A malicious
                    384:         * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
                    385:         * and bypass security checks (act as if it was from 127.0.0.1 by using
                    386:         * IPv6 src ::ffff:127.0.0.1).  Be cautious.
1.35      itojun    387:         *
1.44      itojun    388:         * This check chokes if we are in an SIIT cloud.  As none of BSDs
                    389:         * support IPv4-less kernel compilation, we cannot support SIIT
                    390:         * environment at all.  So, it makes more sense for us to reject any
                    391:         * malicious packets for non-SIIT environment, than try to do a
1.52      wiz       392:         * partial support for SIIT environment.
1.13      itojun    393:         */
                    394:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    395:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   396:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    397:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    398:                goto bad;
                    399:        }
1.17      itojun    400: #if 0
1.13      itojun    401:        /*
1.17      itojun    402:         * Reject packets with IPv4 compatible addresses (auto tunnel).
                    403:         *
                    404:         * The code forbids auto tunnel relay case in RFC1933 (the check is
                    405:         * stronger than RFC1933).  We may want to re-enable it if mech-xx
                    406:         * is revised to forbid relaying case.
1.13      itojun    407:         */
                    408:        if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
                    409:            IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
1.116     thorpej   410:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.13      itojun    411:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    412:                goto bad;
                    413:        }
                    414: #endif
1.35      itojun    415:
1.2       itojun    416:        /*
1.82      yamt      417:         * Disambiguate address scope zones (if there is ambiguity).
                    418:         * We first make sure that the original source or destination address
                    419:         * is not in our internal form for scoped addresses.  Such addresses
                    420:         * are not necessarily invalid spec-wise, but we cannot accept them due
                    421:         * to the usage conflict.
                    422:         * in6_setscope() then also checks and rejects the cases where src or
                    423:         * dst are the loopback address and the receiving interface
1.149.4.2! skrll     424:         * is not loopback.
1.82      yamt      425:         */
1.88      bouyer    426:        if (__predict_false(
                    427:            m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
                    428:                goto bad;
                    429:        ip6 = mtod(m, struct ip6_hdr *);
1.82      yamt      430:        if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
1.116     thorpej   431:                IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
1.82      yamt      432:                goto bad;
                    433:        }
                    434:        if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
                    435:            in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
1.116     thorpej   436:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.82      yamt      437:                goto bad;
                    438:        }
                    439:
                    440:        /*
1.2       itojun    441:         * Multicast check
                    442:         */
                    443:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    444:                struct  in6_multi *in6m = 0;
1.9       itojun    445:
                    446:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
1.2       itojun    447:                /*
                    448:                 * See if we belong to the destination multicast group on the
                    449:                 * arrival interface.
                    450:                 */
                    451:                IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
                    452:                if (in6m)
                    453:                        ours = 1;
                    454:                else if (!ip6_mrouter) {
1.116     thorpej   455:                        uint64_t *ip6s = IP6_STAT_GETREF();
                    456:                        ip6s[IP6_STAT_NOTMEMBER]++;
                    457:                        ip6s[IP6_STAT_CANTFORWARD]++;
                    458:                        IP6_STAT_PUTREF();
1.9       itojun    459:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    460:                        goto bad;
                    461:                }
1.9       itojun    462:                deliverifp = m->m_pkthdr.rcvif;
1.2       itojun    463:                goto hbhcheck;
                    464:        }
                    465:
1.105     dyoung    466:        sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
                    467:
1.2       itojun    468:        /*
                    469:         *  Unicast check
                    470:         */
1.105     dyoung    471:        rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
                    472:        if (hit)
1.116     thorpej   473:                IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
1.93      joerg     474:        else
1.116     thorpej   475:                IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
1.22      itojun    476:
1.109     dyoung    477: #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
1.2       itojun    478:
                    479:        /*
                    480:         * Accept the packet if the forwarding interface to the destination
                    481:         * according to the routing table is the loopback interface,
                    482:         * unless the associated route has a gateway.
                    483:         * Note that this approach causes to accept a packet if there is a
                    484:         * route to the loopback interface for the destination of the packet.
                    485:         * But we think it's even useful in some situations, e.g. when using
                    486:         * a special daemon which wants to intercept the packet.
                    487:         */
1.105     dyoung    488:        if (rt != NULL &&
                    489:            (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
                    490:            !(rt->rt_flags & RTF_CLONED) &&
1.2       itojun    491: #if 0
                    492:            /*
                    493:             * The check below is redundant since the comparison of
                    494:             * the destination and the key of the rtentry has
                    495:             * already done through looking up the routing table.
                    496:             */
1.109     dyoung    497:            IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
1.2       itojun    498: #endif
1.105     dyoung    499:            rt->rt_ifp->if_type == IFT_LOOP) {
                    500:                struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
1.2       itojun    501:                if (ia6->ia6_flags & IN6_IFF_ANYCAST)
                    502:                        m->m_flags |= M_ANYCAST6;
1.24      itojun    503:                /*
                    504:                 * packets to a tentative, duplicated, or somehow invalid
                    505:                 * address must not be accepted.
                    506:                 */
1.2       itojun    507:                if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
1.24      itojun    508:                        /* this address is ready */
1.2       itojun    509:                        ours = 1;
1.9       itojun    510:                        deliverifp = ia6->ia_ifp;       /* correct? */
1.2       itojun    511:                        goto hbhcheck;
                    512:                } else {
1.24      itojun    513:                        /* address is not ready, so discard the packet. */
1.34      itojun    514:                        nd6log((LOG_INFO,
1.27      itojun    515:                            "ip6_input: packet to an unready address %s->%s\n",
1.24      itojun    516:                            ip6_sprintf(&ip6->ip6_src),
1.34      itojun    517:                            ip6_sprintf(&ip6->ip6_dst)));
1.24      itojun    518:
                    519:                        goto bad;
1.2       itojun    520:                }
                    521:        }
                    522:
                    523:        /*
1.55      itojun    524:         * FAITH (Firewall Aided Internet Translator)
1.2       itojun    525:         */
                    526: #if defined(NFAITH) && 0 < NFAITH
                    527:        if (ip6_keepfaith) {
1.105     dyoung    528:                if (rt != NULL && rt->rt_ifp != NULL &&
                    529:                    rt->rt_ifp->if_type == IFT_FAITH) {
1.2       itojun    530:                        /* XXX do we need more sanity checks? */
                    531:                        ours = 1;
1.105     dyoung    532:                        deliverifp = rt->rt_ifp; /* faith */
1.9       itojun    533:                        goto hbhcheck;
                    534:                }
                    535:        }
                    536: #endif
                    537:
                    538: #if 0
                    539:     {
                    540:        /*
                    541:         * Last resort: check in6_ifaddr for incoming interface.
                    542:         * The code is here until I update the "goto ours hack" code above
                    543:         * working right.
                    544:         */
                    545:        struct ifaddr *ifa;
1.113     dyoung    546:        IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.9       itojun    547:                if (ifa->ifa_addr == NULL)
                    548:                        continue;       /* just for safety */
                    549:                if (ifa->ifa_addr->sa_family != AF_INET6)
                    550:                        continue;
                    551:                if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
                    552:                        ours = 1;
                    553:                        deliverifp = ifa->ifa_ifp;
1.2       itojun    554:                        goto hbhcheck;
                    555:                }
                    556:        }
1.9       itojun    557:     }
1.2       itojun    558: #endif
                    559:
                    560:        /*
                    561:         * Now there is no reason to process the packet if it's not our own
                    562:         * and we're not a router.
                    563:         */
                    564:        if (!ip6_forwarding) {
1.116     thorpej   565:                IP6_STATINC(IP6_STAT_CANTFORWARD);
1.9       itojun    566:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
1.2       itojun    567:                goto bad;
                    568:        }
                    569:
                    570:   hbhcheck:
                    571:        /*
1.81      rpaulo    572:         * record address information into m_tag, if we don't have one yet.
                    573:         * note that we are unable to record it, if the address is not listed
                    574:         * as our interface address (e.g. multicast addresses, addresses
                    575:         * within FAITH prefixes and such).
                    576:         */
1.111     dyoung    577:        if (deliverifp && ip6_getdstifaddr(m) == NULL) {
1.81      rpaulo    578:                struct in6_ifaddr *ia6;
                    579:
                    580:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
1.111     dyoung    581:                if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
                    582:                        /*
                    583:                         * XXX maybe we should drop the packet here,
                    584:                         * as we could not provide enough information
                    585:                         * to the upper layers.
                    586:                         */
1.81      rpaulo    587:                }
                    588:        }
                    589:
                    590:        /*
1.2       itojun    591:         * Process Hop-by-Hop options header if it's contained.
                    592:         * m may be modified in ip6_hopopts_input().
                    593:         * If a JumboPayload option is included, plen will also be modified.
                    594:         */
                    595:        plen = (u_int32_t)ntohs(ip6->ip6_plen);
                    596:        if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun    597:                struct ip6_hbh *hbh;
                    598:
                    599:                if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
                    600: #if 0  /*touches NULL pointer*/
                    601:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    602: #endif
1.2       itojun    603:                        return; /* m have already been freed */
1.9       itojun    604:                }
1.22      itojun    605:
1.2       itojun    606:                /* adjust pointer */
                    607:                ip6 = mtod(m, struct ip6_hdr *);
1.22      itojun    608:
                    609:                /*
1.49      itojun    610:                 * if the payload length field is 0 and the next header field
1.22      itojun    611:                 * indicates Hop-by-Hop Options header, then a Jumbo Payload
                    612:                 * option MUST be included.
                    613:                 */
                    614:                if (ip6->ip6_plen == 0 && plen == 0) {
                    615:                        /*
                    616:                         * Note that if a valid jumbo payload option is
1.83      rpaulo    617:                         * contained, ip6_hopopts_input() must set a valid
1.55      itojun    618:                         * (non-zero) payload length to the variable plen.
1.22      itojun    619:                         */
1.116     thorpej   620:                        IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    621:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
                    622:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
                    623:                        icmp6_error(m, ICMP6_PARAM_PROB,
                    624:                                    ICMP6_PARAMPROB_HEADER,
1.97      christos  625:                                    (char *)&ip6->ip6_plen - (char *)ip6);
1.22      itojun    626:                        return;
                    627:                }
1.9       itojun    628:                IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    629:                        sizeof(struct ip6_hbh));
                    630:                if (hbh == NULL) {
1.116     thorpej   631:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    632:                        return;
                    633:                }
1.57      thorpej   634:                KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.9       itojun    635:                nxt = hbh->ip6h_nxt;
1.2       itojun    636:
                    637:                /*
                    638:                 * accept the packet if a router alert option is included
                    639:                 * and we act as an IPv6 router.
                    640:                 */
1.5       itojun    641:                if (rtalert != ~0 && ip6_forwarding)
1.2       itojun    642:                        ours = 1;
                    643:        } else
                    644:                nxt = ip6->ip6_nxt;
                    645:
                    646:        /*
                    647:         * Check that the amount of data in the buffers
                    648:         * is as at least much as the IPv6 header would have us expect.
                    649:         * Trim mbufs if longer than we expect.
                    650:         * Drop packet if shorter than we expect.
                    651:         */
                    652:        if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
1.116     thorpej   653:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    654:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.2       itojun    655:                goto bad;
                    656:        }
                    657:        if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
                    658:                if (m->m_len == m->m_pkthdr.len) {
                    659:                        m->m_len = sizeof(struct ip6_hdr) + plen;
                    660:                        m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
                    661:                } else
                    662:                        m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
                    663:        }
                    664:
                    665:        /*
                    666:         * Forward if desirable.
                    667:         */
                    668:        if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
                    669:                /*
                    670:                 * If we are acting as a multicast router, all
                    671:                 * incoming multicast packets are passed to the
                    672:                 * kernel-level multicast forwarding function.
                    673:                 * The packet is returned (relatively) intact; if
                    674:                 * ip6_mforward() returns a non-zero value, the packet
                    675:                 * must be discarded, else it may be accepted below.
                    676:                 */
                    677:                if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
1.116     thorpej   678:                        IP6_STATINC(IP6_STAT_CANTFORWARD);
1.2       itojun    679:                        m_freem(m);
                    680:                        return;
                    681:                }
                    682:                if (!ours) {
                    683:                        m_freem(m);
                    684:                        return;
                    685:                }
1.22      itojun    686:        } else if (!ours) {
1.64      itojun    687:                ip6_forward(m, srcrt);
1.2       itojun    688:                return;
1.56      itojun    689:        }
1.25      itojun    690:
                    691:        ip6 = mtod(m, struct ip6_hdr *);
                    692:
                    693:        /*
                    694:         * Malicious party may be able to use IPv4 mapped addr to confuse
                    695:         * tcp/udp stack and bypass security checks (act as if it was from
                    696:         * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
                    697:         *
                    698:         * For SIIT end node behavior, you may want to disable the check.
                    699:         * However, you will  become vulnerable to attacks using IPv4 mapped
                    700:         * source.
                    701:         */
                    702:        if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
                    703:            IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
1.116     thorpej   704:                IP6_STATINC(IP6_STAT_BADSCOPE);
1.25      itojun    705:                in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
                    706:                goto bad;
                    707:        }
1.2       itojun    708:
                    709:        /*
                    710:         * Tell launch routine the next header
                    711:         */
1.12      itojun    712: #ifdef IFA_STATS
1.28      itojun    713:        if (deliverifp != NULL) {
1.9       itojun    714:                struct in6_ifaddr *ia6;
                    715:                ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
                    716:                if (ia6)
                    717:                        ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
                    718:        }
                    719: #endif
1.116     thorpej   720:        IP6_STATINC(IP6_STAT_DELIVERED);
1.9       itojun    721:        in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1.2       itojun    722:        nest = 0;
1.40      itojun    723:
1.104     yamt      724:        rh_present = 0;
1.2       itojun    725:        while (nxt != IPPROTO_DONE) {
                    726:                if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
1.116     thorpej   727:                        IP6_STATINC(IP6_STAT_TOOMANYHDR);
1.104     yamt      728:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
1.2       itojun    729:                        goto bad;
                    730:                }
1.8       itojun    731:
                    732:                /*
                    733:                 * protection against faulty packet - there should be
                    734:                 * more sanity checks in header chain processing.
                    735:                 */
                    736:                if (m->m_pkthdr.len < off) {
1.116     thorpej   737:                        IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    738:                        in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1.8       itojun    739:                        goto bad;
                    740:                }
                    741:
1.104     yamt      742:                if (nxt == IPPROTO_ROUTING) {
                    743:                        if (rh_present++) {
                    744:                                in6_ifstat_inc(m->m_pkthdr.rcvif,
                    745:                                    ifs6_in_hdrerr);
1.116     thorpej   746:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.104     yamt      747:                                goto bad;
                    748:                        }
                    749:                }
                    750:
1.142     christos  751: #ifdef IPSEC
1.146     christos  752:                if (ipsec_used) {
1.94      degroote  753:                        /*
1.146     christos  754:                         * enforce IPsec policy checking if we are seeing last
                    755:                         * header. note that we do not visit this with
                    756:                         * protocols with pcb layer code - like udp/tcp/raw ip.
1.94      degroote  757:                         */
1.146     christos  758:                        if ((inet6sw[ip_protox[nxt]].pr_flags
                    759:                            & PR_LASTHDR) != 0) {
1.149.4.1  skrll     760:                                int error = ipsec6_input(m);
1.146     christos  761:                                if (error)
                    762:                                        goto bad;
                    763:                        }
1.94      degroote  764:                }
1.142     christos  765: #endif /* IPSEC */
1.94      degroote  766:
1.2       itojun    767:                nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
                    768:        }
                    769:        return;
                    770:  bad:
                    771:        m_freem(m);
                    772: }
                    773:
                    774: /*
1.81      rpaulo    775:  * set/grab in6_ifaddr correspond to IPv6 destination address.
                    776:  */
                    777: static struct m_tag *
1.112     dyoung    778: ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
1.81      rpaulo    779: {
                    780:        struct m_tag *mtag;
1.144     christos  781:        struct ip6aux *ip6a;
1.81      rpaulo    782:
                    783:        mtag = ip6_addaux(m);
1.144     christos  784:        if (mtag == NULL)
                    785:                return NULL;
1.112     dyoung    786:
1.144     christos  787:        ip6a = (struct ip6aux *)(mtag + 1);
                    788:        if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) {
                    789:                IP6_STATINC(IP6_STAT_BADSCOPE);
                    790:                return NULL;
1.112     dyoung    791:        }
1.144     christos  792:
                    793:        ip6a->ip6a_src = ia->ia_addr.sin6_addr;
                    794:        ip6a->ip6a_flags = ia->ia6_flags;
                    795:        return mtag;
1.81      rpaulo    796: }
                    797:
1.112     dyoung    798: const struct ip6aux *
1.107     christos  799: ip6_getdstifaddr(struct mbuf *m)
1.81      rpaulo    800: {
                    801:        struct m_tag *mtag;
                    802:
                    803:        mtag = ip6_findaux(m);
1.112     dyoung    804:        if (mtag != NULL)
                    805:                return (struct ip6aux *)(mtag + 1);
1.81      rpaulo    806:        else
                    807:                return NULL;
                    808: }
                    809:
                    810: /*
1.2       itojun    811:  * Hop-by-Hop options header processing. If a valid jumbo payload option is
                    812:  * included, the real payload length will be stored in plenp.
1.107     christos  813:  *
                    814:  * rtalertp - XXX: should be stored more smart way
1.2       itojun    815:  */
1.136     drochner  816: int
1.149.4.2! skrll     817: ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
1.107     christos  818:        struct mbuf **mp, int *offp)
1.2       itojun    819: {
1.35      itojun    820:        struct mbuf *m = *mp;
1.2       itojun    821:        int off = *offp, hbhlen;
                    822:        struct ip6_hbh *hbh;
                    823:
                    824:        /* validation of the length of the header */
1.9       itojun    825:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
                    826:                sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
                    827:        if (hbh == NULL) {
1.116     thorpej   828:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    829:                return -1;
                    830:        }
                    831:        hbhlen = (hbh->ip6h_len + 1) << 3;
                    832:        IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
                    833:                hbhlen);
                    834:        if (hbh == NULL) {
1.116     thorpej   835:                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun    836:                return -1;
                    837:        }
1.57      thorpej   838:        KASSERT(IP6_HDR_ALIGNED_P(hbh));
1.2       itojun    839:        off += hbhlen;
                    840:        hbhlen -= sizeof(struct ip6_hbh);
                    841:
                    842:        if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
                    843:                                hbhlen, rtalertp, plenp) < 0)
1.58      itojun    844:                return (-1);
1.2       itojun    845:
                    846:        *offp = off;
                    847:        *mp = m;
1.58      itojun    848:        return (0);
1.2       itojun    849: }
                    850:
                    851: /*
                    852:  * Search header for all Hop-by-hop options and process each option.
                    853:  * This function is separate from ip6_hopopts_input() in order to
                    854:  * handle a case where the sending node itself process its hop-by-hop
                    855:  * options header. In such a case, the function is called from ip6_output().
1.55      itojun    856:  *
                    857:  * The function assumes that hbh header is located right after the IPv6 header
                    858:  * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
                    859:  * opthead + hbhlen is located in continuous memory region.
1.2       itojun    860:  */
1.136     drochner  861: static int
1.149.4.2! skrll     862: ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1.107     christos  863:        u_int32_t *rtalertp, u_int32_t *plenp)
1.2       itojun    864: {
                    865:        struct ip6_hdr *ip6;
                    866:        int optlen = 0;
                    867:        u_int8_t *opt = opthead;
                    868:        u_int16_t rtalert_val;
1.22      itojun    869:        u_int32_t jumboplen;
1.55      itojun    870:        const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1.2       itojun    871:
                    872:        for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1.35      itojun    873:                switch (*opt) {
                    874:                case IP6OPT_PAD1:
                    875:                        optlen = 1;
                    876:                        break;
                    877:                case IP6OPT_PADN:
                    878:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   879:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    880:                                goto bad;
                    881:                        }
                    882:                        optlen = *(opt + 1) + 2;
                    883:                        break;
                    884:                case IP6OPT_RTALERT:
                    885:                        /* XXX may need check for alignment */
                    886:                        if (hbhlen < IP6OPT_RTALERT_LEN) {
1.116     thorpej   887:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    888:                                goto bad;
                    889:                        }
                    890:                        if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1.55      itojun    891:                                /* XXX stat */
                    892:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    893:                                    ICMP6_PARAMPROB_HEADER,
                    894:                                    erroff + opt + 1 - opthead);
                    895:                                return (-1);
1.35      itojun    896:                        }
                    897:                        optlen = IP6OPT_RTALERT_LEN;
1.126     tsutsui   898:                        memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
1.35      itojun    899:                        *rtalertp = ntohs(rtalert_val);
                    900:                        break;
                    901:                case IP6OPT_JUMBO:
1.22      itojun    902:                        /* XXX may need check for alignment */
                    903:                        if (hbhlen < IP6OPT_JUMBO_LEN) {
1.116     thorpej   904:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.22      itojun    905:                                goto bad;
                    906:                        }
1.35      itojun    907:                        if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1.55      itojun    908:                                /* XXX stat */
                    909:                                icmp6_error(m, ICMP6_PARAM_PROB,
                    910:                                    ICMP6_PARAMPROB_HEADER,
                    911:                                    erroff + opt + 1 - opthead);
                    912:                                return (-1);
1.35      itojun    913:                        }
1.22      itojun    914:                        optlen = IP6OPT_JUMBO_LEN;
                    915:
                    916:                        /*
                    917:                         * IPv6 packets that have non 0 payload length
1.35      itojun    918:                         * must not contain a jumbo payload option.
1.22      itojun    919:                         */
                    920:                        ip6 = mtod(m, struct ip6_hdr *);
                    921:                        if (ip6->ip6_plen) {
1.116     thorpej   922:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    923:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    924:                                    ICMP6_PARAMPROB_HEADER,
                    925:                                    erroff + opt - opthead);
                    926:                                return (-1);
1.22      itojun    927:                        }
1.2       itojun    928:
1.22      itojun    929:                        /*
                    930:                         * We may see jumbolen in unaligned location, so
                    931:                         * we'd need to perform bcopy().
                    932:                         */
1.126     tsutsui   933:                        memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
1.22      itojun    934:                        jumboplen = (u_int32_t)htonl(jumboplen);
                    935:
                    936: #if 1
                    937:                        /*
                    938:                         * if there are multiple jumbo payload options,
                    939:                         * *plenp will be non-zero and the packet will be
                    940:                         * rejected.
                    941:                         * the behavior may need some debate in ipngwg -
                    942:                         * multiple options does not make sense, however,
                    943:                         * there's no explicit mention in specification.
                    944:                         */
                    945:                        if (*plenp != 0) {
1.116     thorpej   946:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    947:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    948:                                    ICMP6_PARAMPROB_HEADER,
                    949:                                    erroff + opt + 2 - opthead);
                    950:                                return (-1);
1.22      itojun    951:                        }
1.8       itojun    952: #endif
1.2       itojun    953:
1.22      itojun    954:                        /*
                    955:                         * jumbo payload length must be larger than 65535.
                    956:                         */
                    957:                        if (jumboplen <= IPV6_MAXPACKET) {
1.116     thorpej   958:                                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.22      itojun    959:                                icmp6_error(m, ICMP6_PARAM_PROB,
1.55      itojun    960:                                    ICMP6_PARAMPROB_HEADER,
                    961:                                    erroff + opt + 2 - opthead);
                    962:                                return (-1);
1.22      itojun    963:                        }
                    964:                        *plenp = jumboplen;
                    965:
                    966:                        break;
1.35      itojun    967:                default:                /* unknown option */
                    968:                        if (hbhlen < IP6OPT_MINLEN) {
1.116     thorpej   969:                                IP6_STATINC(IP6_STAT_TOOSMALL);
1.35      itojun    970:                                goto bad;
                    971:                        }
1.55      itojun    972:                        optlen = ip6_unknown_opt(opt, m,
                    973:                            erroff + opt - opthead);
                    974:                        if (optlen == -1)
                    975:                                return (-1);
1.35      itojun    976:                        optlen += 2;
                    977:                        break;
1.2       itojun    978:                }
                    979:        }
                    980:
1.55      itojun    981:        return (0);
1.2       itojun    982:
                    983:   bad:
                    984:        m_freem(m);
1.55      itojun    985:        return (-1);
1.2       itojun    986: }
                    987:
                    988: /*
                    989:  * Unknown option processing.
                    990:  * The third argument `off' is the offset from the IPv6 header to the option,
                    991:  * which is necessary if the IPv6 header the and option header and IPv6 header
                    992:  * is not continuous in order to return an ICMPv6 error.
                    993:  */
                    994: int
1.107     christos  995: ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1.2       itojun    996: {
                    997:        struct ip6_hdr *ip6;
                    998:
1.35      itojun    999:        switch (IP6OPT_TYPE(*optp)) {
                   1000:        case IP6OPT_TYPE_SKIP: /* ignore the option */
1.58      itojun   1001:                return ((int)*(optp + 1));
1.35      itojun   1002:        case IP6OPT_TYPE_DISCARD:       /* silently discard */
                   1003:                m_freem(m);
1.58      itojun   1004:                return (-1);
1.35      itojun   1005:        case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1.116     thorpej  1006:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1007:                icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1008:                return (-1);
1.35      itojun   1009:        case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1.116     thorpej  1010:                IP6_STATINC(IP6_STAT_BADOPTIONS);
1.35      itojun   1011:                ip6 = mtod(m, struct ip6_hdr *);
                   1012:                if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
                   1013:                    (m->m_flags & (M_BCAST|M_MCAST)))
                   1014:                        m_freem(m);
                   1015:                else
                   1016:                        icmp6_error(m, ICMP6_PARAM_PROB,
                   1017:                                    ICMP6_PARAMPROB_OPTION, off);
1.58      itojun   1018:                return (-1);
1.2       itojun   1019:        }
                   1020:
                   1021:        m_freem(m);             /* XXX: NOTREACHED */
1.58      itojun   1022:        return (-1);
1.2       itojun   1023: }
                   1024:
                   1025: /*
1.9       itojun   1026:  * Create the "control" list for this pcb.
                   1027:  *
                   1028:  * The routine will be called from upper layer handlers like tcp6_input().
                   1029:  * Thus the routine assumes that the caller (tcp6_input) have already
                   1030:  * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
                   1031:  * very first mbuf on the mbuf chain.
                   1032:  * We may want to add some infinite loop prevention or sanity checks for safety.
                   1033:  * (This applies only when you are using KAME mbuf chain restriction, i.e.
                   1034:  * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1.2       itojun   1035:  */
                   1036: void
1.149.4.2! skrll    1037: ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
1.107     christos 1038:        struct ip6_hdr *ip6, struct mbuf *m)
1.2       itojun   1039: {
1.85      rpaulo   1040: #ifdef RFC2292
                   1041: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1042: #else
                   1043: #define IS2292(x, y)   (y)
                   1044: #endif
                   1045:
1.123     christos 1046:        if (in6p->in6p_socket->so_options & SO_TIMESTAMP
                   1047: #ifdef SO_OTIMESTAMP
                   1048:            || in6p->in6p_socket->so_options & SO_OTIMESTAMP
                   1049: #endif
                   1050:        ) {
1.2       itojun   1051:                struct timeval tv;
                   1052:
                   1053:                microtime(&tv);
1.123     christos 1054: #ifdef SO_OTIMESTAMP
                   1055:                if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
                   1056:                        struct timeval50 tv50;
                   1057:                        timeval_to_timeval50(&tv, &tv50);
                   1058:                        *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
                   1059:                            SCM_OTIMESTAMP, SOL_SOCKET);
                   1060:                } else
                   1061: #endif
1.97      christos 1062:                *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.63      itojun   1063:                    SCM_TIMESTAMP, SOL_SOCKET);
1.2       itojun   1064:                if (*mp)
                   1065:                        mp = &(*mp)->m_next;
                   1066:        }
1.87      rpaulo   1067:
                   1068:        /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
                   1069:        if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
                   1070:                return;
                   1071:
1.2       itojun   1072:        /* RFC 2292 sec. 5 */
1.35      itojun   1073:        if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1.2       itojun   1074:                struct in6_pktinfo pi6;
1.85      rpaulo   1075:
1.126     tsutsui  1076:                memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1.81      rpaulo   1077:                in6_clearscope(&pi6.ipi6_addr); /* XXX */
1.84      christos 1078:                pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
                   1079:                    m->m_pkthdr.rcvif->if_index : 0;
1.97      christos 1080:                *mp = sbcreatecontrol((void *) &pi6,
1.85      rpaulo   1081:                    sizeof(struct in6_pktinfo),
                   1082:                    IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1.2       itojun   1083:                if (*mp)
                   1084:                        mp = &(*mp)->m_next;
                   1085:        }
1.85      rpaulo   1086:
1.2       itojun   1087:        if (in6p->in6p_flags & IN6P_HOPLIMIT) {
                   1088:                int hlim = ip6->ip6_hlim & 0xff;
1.85      rpaulo   1089:
1.97      christos 1090:                *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1.85      rpaulo   1091:                    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
                   1092:                if (*mp)
                   1093:                        mp = &(*mp)->m_next;
                   1094:        }
                   1095:
                   1096:        if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
                   1097:                u_int32_t flowinfo;
                   1098:                int tclass;
                   1099:
                   1100:                flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
                   1101:                flowinfo >>= 20;
                   1102:
                   1103:                tclass = flowinfo & 0xff;
1.97      christos 1104:                *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1.85      rpaulo   1105:                    IPV6_TCLASS, IPPROTO_IPV6);
                   1106:
1.2       itojun   1107:                if (*mp)
                   1108:                        mp = &(*mp)->m_next;
                   1109:        }
                   1110:
                   1111:        /*
1.75      itojun   1112:         * IPV6_HOPOPTS socket option.  Recall that we required super-user
                   1113:         * privilege for the option (see ip6_ctloutput), but it might be too
                   1114:         * strict, since there might be some hop-by-hop options which can be
                   1115:         * returned to normal user.
1.85      rpaulo   1116:         * See also RFC3542 section 8 (or RFC2292 section 6).
1.2       itojun   1117:         */
1.75      itojun   1118:        if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1.2       itojun   1119:                /*
                   1120:                 * Check if a hop-by-hop options header is contatined in the
                   1121:                 * received packet, and if so, store the options as ancillary
                   1122:                 * data. Note that a hop-by-hop options header must be
                   1123:                 * just after the IPv6 header, which fact is assured through
                   1124:                 * the IPv6 input processing.
                   1125:                 */
1.78      christos 1126:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1127:                if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1.9       itojun   1128:                        struct ip6_hbh *hbh;
                   1129:                        int hbhlen;
1.62      itojun   1130:                        struct mbuf *ext;
1.9       itojun   1131:
1.62      itojun   1132:                        ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1.78      christos 1133:                            xip6->ip6_nxt);
1.62      itojun   1134:                        if (ext == NULL) {
1.116     thorpej  1135:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1136:                                return;
                   1137:                        }
1.62      itojun   1138:                        hbh = mtod(ext, struct ip6_hbh *);
1.9       itojun   1139:                        hbhlen = (hbh->ip6h_len + 1) << 3;
1.62      itojun   1140:                        if (hbhlen != ext->m_len) {
                   1141:                                m_freem(ext);
1.116     thorpej  1142:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1143:                                return;
                   1144:                        }
1.2       itojun   1145:
                   1146:                        /*
                   1147:                         * XXX: We copy whole the header even if a jumbo
                   1148:                         * payload option is included, which option is to
                   1149:                         * be removed before returning in the RFC 2292.
1.85      rpaulo   1150:                         * Note: this constraint is removed in RFC3542.
1.2       itojun   1151:                         */
1.97      christos 1152:                        *mp = sbcreatecontrol((void *)hbh, hbhlen,
1.85      rpaulo   1153:                            IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
                   1154:                            IPPROTO_IPV6);
1.2       itojun   1155:                        if (*mp)
                   1156:                                mp = &(*mp)->m_next;
1.62      itojun   1157:                        m_freem(ext);
1.2       itojun   1158:                }
                   1159:        }
                   1160:
                   1161:        /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
                   1162:        if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1.78      christos 1163:                struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
                   1164:                int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1.2       itojun   1165:
                   1166:                /*
                   1167:                 * Search for destination options headers or routing
                   1168:                 * header(s) through the header chain, and stores each
                   1169:                 * header as ancillary data.
                   1170:                 * Note that the order of the headers remains in
                   1171:                 * the chain of ancillary data.
                   1172:                 */
1.86      rpaulo   1173:                for (;;) {      /* is explicit loop prevention necessary? */
1.62      itojun   1174:                        struct ip6_ext *ip6e = NULL;
1.9       itojun   1175:                        int elen;
1.62      itojun   1176:                        struct mbuf *ext = NULL;
1.9       itojun   1177:
1.62      itojun   1178:                        /*
                   1179:                         * if it is not an extension header, don't try to
                   1180:                         * pull it from the chain.
                   1181:                         */
                   1182:                        switch (nxt) {
                   1183:                        case IPPROTO_DSTOPTS:
                   1184:                        case IPPROTO_ROUTING:
                   1185:                        case IPPROTO_HOPOPTS:
                   1186:                        case IPPROTO_AH: /* is it possible? */
                   1187:                                break;
                   1188:                        default:
                   1189:                                goto loopend;
                   1190:                        }
                   1191:
                   1192:                        ext = ip6_pullexthdr(m, off, nxt);
                   1193:                        if (ext == NULL) {
1.116     thorpej  1194:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1195:                                return;
                   1196:                        }
1.62      itojun   1197:                        ip6e = mtod(ext, struct ip6_ext *);
1.9       itojun   1198:                        if (nxt == IPPROTO_AH)
                   1199:                                elen = (ip6e->ip6e_len + 2) << 2;
                   1200:                        else
                   1201:                                elen = (ip6e->ip6e_len + 1) << 3;
1.62      itojun   1202:                        if (elen != ext->m_len) {
                   1203:                                m_freem(ext);
1.116     thorpej  1204:                                IP6_STATINC(IP6_STAT_TOOSHORT);
1.9       itojun   1205:                                return;
                   1206:                        }
1.57      thorpej  1207:                        KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1.2       itojun   1208:
1.35      itojun   1209:                        switch (nxt) {
1.62      itojun   1210:                        case IPPROTO_DSTOPTS:
1.127     martin   1211:                                if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1.35      itojun   1212:                                        break;
                   1213:
1.97      christos 1214:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1215:                                    IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
                   1216:                                    IPPROTO_IPV6);
1.35      itojun   1217:                                if (*mp)
                   1218:                                        mp = &(*mp)->m_next;
                   1219:                                break;
                   1220:
                   1221:                        case IPPROTO_ROUTING:
1.127     martin   1222:                                if (!(in6p->in6p_flags & IN6P_RTHDR))
1.35      itojun   1223:                                        break;
                   1224:
1.97      christos 1225:                                *mp = sbcreatecontrol((void *)ip6e, elen,
1.85      rpaulo   1226:                                    IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
                   1227:                                    IPPROTO_IPV6);
1.35      itojun   1228:                                if (*mp)
                   1229:                                        mp = &(*mp)->m_next;
                   1230:                                break;
                   1231:
1.62      itojun   1232:                        case IPPROTO_HOPOPTS:
                   1233:                        case IPPROTO_AH: /* is it possible? */
                   1234:                                break;
                   1235:
1.35      itojun   1236:                        default:
                   1237:                                /*
1.62      itojun   1238:                                 * other cases have been filtered in the above.
                   1239:                                 * none will visit this case.  here we supply
                   1240:                                 * the code just in case (nxt overwritten or
                   1241:                                 * other cases).
1.35      itojun   1242:                                 */
1.62      itojun   1243:                                m_freem(ext);
1.35      itojun   1244:                                goto loopend;
                   1245:
1.2       itojun   1246:                        }
                   1247:
                   1248:                        /* proceed with the next header. */
1.9       itojun   1249:                        off += elen;
1.2       itojun   1250:                        nxt = ip6e->ip6e_nxt;
1.62      itojun   1251:                        ip6e = NULL;
                   1252:                        m_freem(ext);
                   1253:                        ext = NULL;
1.2       itojun   1254:                }
                   1255:          loopend:
1.62      itojun   1256:                ;
1.2       itojun   1257:        }
1.62      itojun   1258: }
1.85      rpaulo   1259: #undef IS2292
                   1260:
                   1261:
                   1262: void
1.95      dyoung   1263: ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
                   1264:     uint32_t *mtu)
1.85      rpaulo   1265: {
                   1266:        struct socket *so;
                   1267:        struct mbuf *m_mtu;
                   1268:        struct ip6_mtuinfo mtuctl;
                   1269:
                   1270:        so = in6p->in6p_socket;
                   1271:
                   1272:        if (mtu == NULL)
                   1273:                return;
                   1274:
                   1275: #ifdef DIAGNOSTIC
                   1276:        if (so == NULL)         /* I believe this is impossible */
                   1277:                panic("ip6_notify_pmtu: socket is NULL");
                   1278: #endif
                   1279:
                   1280:        memset(&mtuctl, 0, sizeof(mtuctl));     /* zero-clear for safety */
                   1281:        mtuctl.ip6m_mtu = *mtu;
                   1282:        mtuctl.ip6m_addr = *dst;
                   1283:        if (sa6_recoverscope(&mtuctl.ip6m_addr))
                   1284:                return;
                   1285:
1.97      christos 1286:        if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1.85      rpaulo   1287:            IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
                   1288:                return;
                   1289:
1.95      dyoung   1290:        if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1.85      rpaulo   1291:            == 0) {
                   1292:                m_freem(m_mtu);
                   1293:                /* XXX: should count statistics */
                   1294:        } else
                   1295:                sorwakeup(so);
                   1296:
                   1297:        return;
                   1298: }
1.62      itojun   1299:
                   1300: /*
                   1301:  * pull single extension header from mbuf chain.  returns single mbuf that
                   1302:  * contains the result, or NULL on error.
                   1303:  */
                   1304: static struct mbuf *
1.107     christos 1305: ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1.62      itojun   1306: {
                   1307:        struct ip6_ext ip6e;
                   1308:        size_t elen;
                   1309:        struct mbuf *n;
                   1310:
                   1311: #ifdef DIAGNOSTIC
                   1312:        switch (nxt) {
                   1313:        case IPPROTO_DSTOPTS:
                   1314:        case IPPROTO_ROUTING:
                   1315:        case IPPROTO_HOPOPTS:
                   1316:        case IPPROTO_AH: /* is it possible? */
                   1317:                break;
                   1318:        default:
                   1319:                printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1.2       itojun   1320:        }
1.62      itojun   1321: #endif
1.2       itojun   1322:
1.97      christos 1323:        m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.62      itojun   1324:        if (nxt == IPPROTO_AH)
                   1325:                elen = (ip6e.ip6e_len + 2) << 2;
                   1326:        else
                   1327:                elen = (ip6e.ip6e_len + 1) << 3;
                   1328:
                   1329:        MGET(n, M_DONTWAIT, MT_DATA);
                   1330:        if (n && elen >= MLEN) {
                   1331:                MCLGET(n, M_DONTWAIT);
                   1332:                if ((n->m_flags & M_EXT) == 0) {
                   1333:                        m_free(n);
                   1334:                        n = NULL;
                   1335:                }
                   1336:        }
                   1337:        if (!n)
                   1338:                return NULL;
                   1339:
                   1340:        n->m_len = 0;
                   1341:        if (elen >= M_TRAILINGSPACE(n)) {
                   1342:                m_free(n);
                   1343:                return NULL;
                   1344:        }
                   1345:
1.97      christos 1346:        m_copydata(m, off, elen, mtod(n, void *));
1.62      itojun   1347:        n->m_len = elen;
                   1348:        return n;
1.2       itojun   1349: }
                   1350:
                   1351: /*
                   1352:  * Get pointer to the previous header followed by the header
                   1353:  * currently processed.
                   1354:  * XXX: This function supposes that
                   1355:  *     M includes all headers,
                   1356:  *     the next header field and the header length field of each header
                   1357:  *     are valid, and
                   1358:  *     the sum of each header length equals to OFF.
                   1359:  * Because of these assumptions, this function must be called very
                   1360:  * carefully. Moreover, it will not be used in the near future when
                   1361:  * we develop `neater' mechanism to process extension headers.
                   1362:  */
1.58      itojun   1363: u_int8_t *
1.107     christos 1364: ip6_get_prevhdr(struct mbuf *m, int off)
1.2       itojun   1365: {
                   1366:        struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
                   1367:
                   1368:        if (off == sizeof(struct ip6_hdr))
1.58      itojun   1369:                return (&ip6->ip6_nxt);
1.2       itojun   1370:        else {
                   1371:                int len, nxt;
                   1372:                struct ip6_ext *ip6e = NULL;
                   1373:
                   1374:                nxt = ip6->ip6_nxt;
                   1375:                len = sizeof(struct ip6_hdr);
                   1376:                while (len < off) {
1.97      christos 1377:                        ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1.2       itojun   1378:
1.35      itojun   1379:                        switch (nxt) {
1.2       itojun   1380:                        case IPPROTO_FRAGMENT:
                   1381:                                len += sizeof(struct ip6_frag);
                   1382:                                break;
                   1383:                        case IPPROTO_AH:
                   1384:                                len += (ip6e->ip6e_len + 2) << 2;
                   1385:                                break;
                   1386:                        default:
                   1387:                                len += (ip6e->ip6e_len + 1) << 3;
                   1388:                                break;
                   1389:                        }
                   1390:                        nxt = ip6e->ip6e_nxt;
                   1391:                }
                   1392:                if (ip6e)
1.58      itojun   1393:                        return (&ip6e->ip6e_nxt);
1.2       itojun   1394:                else
                   1395:                        return NULL;
1.18      itojun   1396:        }
                   1397: }
                   1398:
                   1399: /*
                   1400:  * get next header offset.  m will be retained.
                   1401:  */
                   1402: int
1.107     christos 1403: ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1404: {
                   1405:        struct ip6_hdr ip6;
                   1406:        struct ip6_ext ip6e;
                   1407:        struct ip6_frag fh;
                   1408:
                   1409:        /* just in case */
                   1410:        if (m == NULL)
                   1411:                panic("ip6_nexthdr: m == NULL");
                   1412:        if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
                   1413:                return -1;
                   1414:
                   1415:        switch (proto) {
                   1416:        case IPPROTO_IPV6:
1.83      rpaulo   1417:                /* do not chase beyond intermediate IPv6 headers */
                   1418:                if (off != 0)
                   1419:                        return -1;
1.18      itojun   1420:                if (m->m_pkthdr.len < off + sizeof(ip6))
                   1421:                        return -1;
1.97      christos 1422:                m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1.18      itojun   1423:                if (nxtp)
                   1424:                        *nxtp = ip6.ip6_nxt;
                   1425:                off += sizeof(ip6);
                   1426:                return off;
                   1427:
                   1428:        case IPPROTO_FRAGMENT:
                   1429:                /*
                   1430:                 * terminate parsing if it is not the first fragment,
                   1431:                 * it does not make sense to parse through it.
                   1432:                 */
                   1433:                if (m->m_pkthdr.len < off + sizeof(fh))
                   1434:                        return -1;
1.97      christos 1435:                m_copydata(m, off, sizeof(fh), (void *)&fh);
1.67      itojun   1436:                if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1.18      itojun   1437:                        return -1;
                   1438:                if (nxtp)
                   1439:                        *nxtp = fh.ip6f_nxt;
                   1440:                off += sizeof(struct ip6_frag);
                   1441:                return off;
                   1442:
                   1443:        case IPPROTO_AH:
                   1444:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1445:                        return -1;
1.97      christos 1446:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1447:                if (nxtp)
                   1448:                        *nxtp = ip6e.ip6e_nxt;
                   1449:                off += (ip6e.ip6e_len + 2) << 2;
1.47      itojun   1450:                if (m->m_pkthdr.len < off)
                   1451:                        return -1;
1.18      itojun   1452:                return off;
                   1453:
                   1454:        case IPPROTO_HOPOPTS:
                   1455:        case IPPROTO_ROUTING:
                   1456:        case IPPROTO_DSTOPTS:
                   1457:                if (m->m_pkthdr.len < off + sizeof(ip6e))
                   1458:                        return -1;
1.97      christos 1459:                m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1.18      itojun   1460:                if (nxtp)
                   1461:                        *nxtp = ip6e.ip6e_nxt;
                   1462:                off += (ip6e.ip6e_len + 1) << 3;
1.47      itojun   1463:                if (m->m_pkthdr.len < off)
                   1464:                        return -1;
1.18      itojun   1465:                return off;
                   1466:
                   1467:        case IPPROTO_NONE:
                   1468:        case IPPROTO_ESP:
                   1469:        case IPPROTO_IPCOMP:
                   1470:                /* give up */
                   1471:                return -1;
                   1472:
                   1473:        default:
                   1474:                return -1;
                   1475:        }
                   1476: }
                   1477:
                   1478: /*
                   1479:  * get offset for the last header in the chain.  m will be kept untainted.
                   1480:  */
                   1481: int
1.107     christos 1482: ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1.18      itojun   1483: {
                   1484:        int newoff;
                   1485:        int nxt;
                   1486:
                   1487:        if (!nxtp) {
                   1488:                nxt = -1;
                   1489:                nxtp = &nxt;
                   1490:        }
1.86      rpaulo   1491:        for (;;) {
1.18      itojun   1492:                newoff = ip6_nexthdr(m, off, proto, nxtp);
                   1493:                if (newoff < 0)
                   1494:                        return off;
                   1495:                else if (newoff < off)
                   1496:                        return -1;      /* invalid */
                   1497:                else if (newoff == off)
                   1498:                        return newoff;
                   1499:
                   1500:                off = newoff;
                   1501:                proto = *nxtp;
1.2       itojun   1502:        }
                   1503: }
                   1504:
1.81      rpaulo   1505: struct m_tag *
1.107     christos 1506: ip6_addaux(struct mbuf *m)
1.81      rpaulo   1507: {
                   1508:        struct m_tag *mtag;
                   1509:
                   1510:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1511:        if (!mtag) {
                   1512:                mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
                   1513:                    M_NOWAIT);
                   1514:                if (mtag) {
                   1515:                        m_tag_prepend(m, mtag);
1.124     cegger   1516:                        memset(mtag + 1, 0, sizeof(struct ip6aux));
1.81      rpaulo   1517:                }
                   1518:        }
                   1519:        return mtag;
                   1520: }
                   1521:
                   1522: struct m_tag *
1.107     christos 1523: ip6_findaux(struct mbuf *m)
1.81      rpaulo   1524: {
                   1525:        struct m_tag *mtag;
                   1526:
                   1527:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1528:        return mtag;
                   1529: }
                   1530:
                   1531: void
1.107     christos 1532: ip6_delaux(struct mbuf *m)
1.81      rpaulo   1533: {
                   1534:        struct m_tag *mtag;
                   1535:
                   1536:        mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
                   1537:        if (mtag)
                   1538:                m_tag_delete(m, mtag);
                   1539: }
                   1540:
1.98      liamjfoy 1541: #ifdef GATEWAY
1.149.4.2! skrll    1542: /*
1.98      liamjfoy 1543:  * sysctl helper routine for net.inet.ip6.maxflows. Since
                   1544:  * we could reduce this value, call ip6flow_reap();
                   1545:  */
                   1546: static int
1.101     liamjfoy 1547: sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1.149.4.2! skrll    1548: {
1.121     simonb   1549:        int error;
1.149.4.2! skrll    1550:
1.121     simonb   1551:        error = sysctl_lookup(SYSCTLFN_CALL(rnode));
                   1552:        if (error || newp == NULL)
                   1553:                return (error);
1.149.4.2! skrll    1554:
1.121     simonb   1555:        mutex_enter(softnet_lock);
1.122     matt     1556:        KERNEL_LOCK(1, NULL);
1.120     matt     1557:
1.121     simonb   1558:        ip6flow_reap(0);
1.120     matt     1559:
                   1560:        KERNEL_UNLOCK_ONE(NULL);
1.121     simonb   1561:        mutex_exit(softnet_lock);
1.149.4.2! skrll    1562:
1.121     simonb   1563:        return (0);
1.98      liamjfoy 1564: }
1.99      liamjfoy 1565:
                   1566: static int
                   1567: sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
1.149.4.2! skrll    1568: {
1.99      liamjfoy 1569:        int error, tmp;
                   1570:        struct sysctlnode node;
                   1571:
                   1572:        node = *rnode;
                   1573:        tmp = ip6_hashsize;
                   1574:        node.sysctl_data = &tmp;
                   1575:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1576:        if (error || newp == NULL)
                   1577:                return (error);
                   1578:
                   1579:        if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
                   1580:                /*
                   1581:                 * Can only fail due to malloc()
                   1582:                 */
1.120     matt     1583:                mutex_enter(softnet_lock);
1.122     matt     1584:                KERNEL_LOCK(1, NULL);
1.120     matt     1585:
                   1586:                error = ip6flow_invalidate_all(tmp);
                   1587:
                   1588:                KERNEL_UNLOCK_ONE(NULL);
                   1589:                mutex_exit(softnet_lock);
1.99      liamjfoy 1590:        } else {
                   1591:                /*
                   1592:                 * EINVAL if not a power of 2
1.121     simonb   1593:                 */
1.120     matt     1594:                error = EINVAL;
1.149.4.2! skrll    1595:        }
1.99      liamjfoy 1596:
1.120     matt     1597:        return error;
1.99      liamjfoy 1598: }
1.98      liamjfoy 1599: #endif /* GATEWAY */
                   1600:
1.2       itojun   1601: /*
                   1602:  * System control for IP6
                   1603:  */
                   1604:
1.120     matt     1605: const u_char inet6ctlerrmap[PRC_NCMDS] = {
1.2       itojun   1606:        0,              0,              0,              0,
                   1607:        0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
                   1608:        EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
                   1609:        EMSGSIZE,       EHOSTUNREACH,   0,              0,
                   1610:        0,              0,              0,              0,
                   1611:        ENOPROTOOPT
                   1612: };
                   1613:
1.116     thorpej  1614: static int
                   1615: sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
                   1616: {
                   1617:
1.119     thorpej  1618:        return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1.116     thorpej  1619: }
                   1620:
1.128     pooka    1621: static void
                   1622: sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1.2       itojun   1623: {
1.85      rpaulo   1624: #ifdef RFC2292
                   1625: #define IS2292(x, y)   ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
                   1626: #else
                   1627: #define IS2292(x, y)   (y)
                   1628: #endif
1.26      itojun   1629:
1.73      atatat   1630:        sysctl_createv(clog, 0, NULL, NULL,
                   1631:                       CTLFLAG_PERMANENT,
1.74      atatat   1632:                       CTLTYPE_NODE, "inet6",
                   1633:                       SYSCTL_DESCR("PF_INET6 related settings"),
1.70      atatat   1634:                       NULL, 0, NULL, 0,
                   1635:                       CTL_NET, PF_INET6, CTL_EOL);
1.73      atatat   1636:        sysctl_createv(clog, 0, NULL, NULL,
                   1637:                       CTLFLAG_PERMANENT,
1.74      atatat   1638:                       CTLTYPE_NODE, "ip6",
                   1639:                       SYSCTL_DESCR("IPv6 related settings"),
1.70      atatat   1640:                       NULL, 0, NULL, 0,
                   1641:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
                   1642:
1.73      atatat   1643:        sysctl_createv(clog, 0, NULL, NULL,
                   1644:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1645:                       CTLTYPE_INT, "forwarding",
                   1646:                       SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1.70      atatat   1647:                       NULL, 0, &ip6_forwarding, 0,
                   1648:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1649:                       IPV6CTL_FORWARDING, CTL_EOL);
1.73      atatat   1650:        sysctl_createv(clog, 0, NULL, NULL,
                   1651:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1652:                       CTLTYPE_INT, "redirect",
                   1653:                       SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1.70      atatat   1654:                       NULL, 0, &ip6_sendredirects, 0,
                   1655:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1656:                       IPV6CTL_SENDREDIRECTS, CTL_EOL);
1.73      atatat   1657:        sysctl_createv(clog, 0, NULL, NULL,
                   1658:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1659:                       CTLTYPE_INT, "hlim",
                   1660:                       SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1.70      atatat   1661:                       NULL, 0, &ip6_defhlim, 0,
                   1662:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1663:                       IPV6CTL_DEFHLIM, CTL_EOL);
                   1664: #ifdef notyet
1.73      atatat   1665:        sysctl_createv(clog, 0, NULL, NULL,
                   1666:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1667:                       CTLTYPE_INT, "mtu", NULL,
                   1668:                       NULL, 0, &, 0,
                   1669:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1670:                       IPV6CTL_DEFMTU, CTL_EOL);
                   1671: #endif
                   1672: #ifdef __no_idea__
1.73      atatat   1673:        sysctl_createv(clog, 0, NULL, NULL,
                   1674:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1675:                       CTLTYPE_INT, "forwsrcrt", NULL,
                   1676:                       NULL, 0, &?, 0,
                   1677:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1678:                       IPV6CTL_FORWSRCRT, CTL_EOL);
1.73      atatat   1679:        sysctl_createv(clog, 0, NULL, NULL,
                   1680:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1681:                       CTLTYPE_STRUCT, "mrtstats", NULL,
                   1682:                       NULL, 0, &?, sizeof(?),
                   1683:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1684:                       IPV6CTL_MRTSTATS, CTL_EOL);
1.73      atatat   1685:        sysctl_createv(clog, 0, NULL, NULL,
                   1686:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1687:                       CTLTYPE_?, "mrtproto", NULL,
                   1688:                       NULL, 0, &?, sizeof(?),
                   1689:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1690:                       IPV6CTL_MRTPROTO, CTL_EOL);
                   1691: #endif
1.73      atatat   1692:        sysctl_createv(clog, 0, NULL, NULL,
                   1693:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1694:                       CTLTYPE_INT, "maxfragpackets",
                   1695:                       SYSCTL_DESCR("Maximum number of fragments to buffer "
                   1696:                                    "for reassembly"),
1.70      atatat   1697:                       NULL, 0, &ip6_maxfragpackets, 0,
                   1698:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1699:                       IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
                   1700: #ifdef __no_idea__
1.73      atatat   1701:        sysctl_createv(clog, 0, NULL, NULL,
                   1702:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1703:                       CTLTYPE_INT, "sourcecheck", NULL,
                   1704:                       NULL, 0, &?, 0,
                   1705:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1706:                       IPV6CTL_SOURCECHECK, CTL_EOL);
1.73      atatat   1707:        sysctl_createv(clog, 0, NULL, NULL,
                   1708:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1709:                       CTLTYPE_INT, "sourcecheck_logint", NULL,
                   1710:                       NULL, 0, &?, 0,
                   1711:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1712:                       IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
                   1713: #endif
1.73      atatat   1714:        sysctl_createv(clog, 0, NULL, NULL,
                   1715:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1716:                       CTLTYPE_INT, "accept_rtadv",
                   1717:                       SYSCTL_DESCR("Accept router advertisements"),
1.70      atatat   1718:                       NULL, 0, &ip6_accept_rtadv, 0,
                   1719:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1720:                       IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1.73      atatat   1721:        sysctl_createv(clog, 0, NULL, NULL,
                   1722:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.131     spz      1723:                       CTLTYPE_INT, "rtadv_maxroutes",
                   1724:                       SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"),
                   1725:                       NULL, 0, &ip6_rtadv_maxroutes, 0,
                   1726:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1727:                       IPV6CTL_RTADV_MAXROUTES, CTL_EOL);
                   1728:        sysctl_createv(clog, 0, NULL, NULL,
                   1729:                       CTLFLAG_PERMANENT,
                   1730:                       CTLTYPE_INT, "rtadv_numroutes",
                   1731:                       SYSCTL_DESCR("Current number of routes accepted via router advertisements"),
                   1732:                       NULL, 0, &nd6_numroutes, 0,
                   1733:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1734:                       IPV6CTL_RTADV_NUMROUTES, CTL_EOL);
                   1735:        sysctl_createv(clog, 0, NULL, NULL,
                   1736:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1737:                       CTLTYPE_INT, "keepfaith",
                   1738:                       SYSCTL_DESCR("Activate faith interface"),
1.70      atatat   1739:                       NULL, 0, &ip6_keepfaith, 0,
                   1740:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1741:                       IPV6CTL_KEEPFAITH, CTL_EOL);
1.73      atatat   1742:        sysctl_createv(clog, 0, NULL, NULL,
                   1743:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1744:                       CTLTYPE_INT, "log_interval",
                   1745:                       SYSCTL_DESCR("Minumum interval between logging "
                   1746:                                    "unroutable packets"),
1.70      atatat   1747:                       NULL, 0, &ip6_log_interval, 0,
                   1748:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1749:                       IPV6CTL_LOG_INTERVAL, CTL_EOL);
1.73      atatat   1750:        sysctl_createv(clog, 0, NULL, NULL,
                   1751:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1752:                       CTLTYPE_INT, "hdrnestlimit",
                   1753:                       SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1.70      atatat   1754:                       NULL, 0, &ip6_hdrnestlimit, 0,
                   1755:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1756:                       IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1.73      atatat   1757:        sysctl_createv(clog, 0, NULL, NULL,
                   1758:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1759:                       CTLTYPE_INT, "dad_count",
                   1760:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1761:                                    "probes to send"),
1.70      atatat   1762:                       NULL, 0, &ip6_dad_count, 0,
                   1763:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1764:                       IPV6CTL_DAD_COUNT, CTL_EOL);
1.73      atatat   1765:        sysctl_createv(clog, 0, NULL, NULL,
                   1766:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1767:                       CTLTYPE_INT, "auto_flowlabel",
                   1768:                       SYSCTL_DESCR("Assign random IPv6 flow labels"),
1.70      atatat   1769:                       NULL, 0, &ip6_auto_flowlabel, 0,
                   1770:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1771:                       IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1.73      atatat   1772:        sysctl_createv(clog, 0, NULL, NULL,
                   1773:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1774:                       CTLTYPE_INT, "defmcasthlim",
                   1775:                       SYSCTL_DESCR("Default multicast hop limit"),
1.70      atatat   1776:                       NULL, 0, &ip6_defmcasthlim, 0,
                   1777:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1778:                       IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1.51      itojun   1779: #if NGIF > 0
1.73      atatat   1780:        sysctl_createv(clog, 0, NULL, NULL,
                   1781:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1782:                       CTLTYPE_INT, "gifhlim",
                   1783:                       SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1.70      atatat   1784:                       NULL, 0, &ip6_gif_hlim, 0,
                   1785:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1786:                       IPV6CTL_GIF_HLIM, CTL_EOL);
                   1787: #endif /* NGIF */
1.73      atatat   1788:        sysctl_createv(clog, 0, NULL, NULL,
                   1789:                       CTLFLAG_PERMANENT,
1.74      atatat   1790:                       CTLTYPE_STRING, "kame_version",
                   1791:                       SYSCTL_DESCR("KAME Version"),
1.78      christos 1792:                       NULL, 0, __UNCONST(__KAME_VERSION), 0,
1.70      atatat   1793:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1794:                       IPV6CTL_KAME_VERSION, CTL_EOL);
1.73      atatat   1795:        sysctl_createv(clog, 0, NULL, NULL,
                   1796:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1797:                       CTLTYPE_INT, "use_deprecated",
                   1798:                       SYSCTL_DESCR("Allow use of deprecated addresses as "
                   1799:                                    "source addresses"),
1.70      atatat   1800:                       NULL, 0, &ip6_use_deprecated, 0,
                   1801:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1802:                       IPV6CTL_USE_DEPRECATED, CTL_EOL);
1.73      atatat   1803:        sysctl_createv(clog, 0, NULL, NULL,
                   1804:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.70      atatat   1805:                       CTLTYPE_INT, "rr_prune", NULL,
                   1806:                       NULL, 0, &ip6_rr_prune, 0,
                   1807:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1808:                       IPV6CTL_RR_PRUNE, CTL_EOL);
1.73      atatat   1809:        sysctl_createv(clog, 0, NULL, NULL,
                   1810:                       CTLFLAG_PERMANENT
1.70      atatat   1811: #ifndef INET6_BINDV6ONLY
1.73      atatat   1812:                       |CTLFLAG_READWRITE,
1.70      atatat   1813: #endif
1.74      atatat   1814:                       CTLTYPE_INT, "v6only",
                   1815:                       SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
                   1816:                                    "to PF_INET sockets"),
1.70      atatat   1817:                       NULL, 0, &ip6_v6only, 0,
                   1818:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1819:                       IPV6CTL_V6ONLY, CTL_EOL);
1.73      atatat   1820:        sysctl_createv(clog, 0, NULL, NULL,
                   1821:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.147     roy      1822:                       CTLTYPE_INT, "auto_linklocal",
                   1823:                       SYSCTL_DESCR("Default value of per-interface flag for "
                   1824:                                    "adding an IPv6 link-local address to "
                   1825:                                    "interfaces when attached"),
                   1826:                       NULL, 0, &ip6_auto_linklocal, 0,
                   1827:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1828:                       IPV6CTL_AUTO_LINKLOCAL, CTL_EOL);
                   1829:        sysctl_createv(clog, 0, NULL, NULL,
                   1830:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1831:                       CTLTYPE_INT, "anonportmin",
                   1832:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.70      atatat   1833:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
                   1834:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1835:                       IPV6CTL_ANONPORTMIN, CTL_EOL);
1.73      atatat   1836:        sysctl_createv(clog, 0, NULL, NULL,
                   1837:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1838:                       CTLTYPE_INT, "anonportmax",
                   1839:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.70      atatat   1840:                       sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
                   1841:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1842:                       IPV6CTL_ANONPORTMAX, CTL_EOL);
1.26      itojun   1843: #ifndef IPNOPRIVPORTS
1.73      atatat   1844:        sysctl_createv(clog, 0, NULL, NULL,
                   1845:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1846:                       CTLTYPE_INT, "lowportmin",
                   1847:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1848:                                    "to assign"),
1.70      atatat   1849:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
                   1850:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1851:                       IPV6CTL_LOWPORTMIN, CTL_EOL);
1.73      atatat   1852:        sysctl_createv(clog, 0, NULL, NULL,
                   1853:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1854:                       CTLTYPE_INT, "lowportmax",
                   1855:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1856:                                    "to assign"),
1.70      atatat   1857:                       sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
                   1858:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1859:                       IPV6CTL_LOWPORTMAX, CTL_EOL);
                   1860: #endif /* IPNOPRIVPORTS */
1.73      atatat   1861:        sysctl_createv(clog, 0, NULL, NULL,
                   1862:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1863:                       CTLTYPE_INT, "use_tempaddr",
                   1864:                       SYSCTL_DESCR("Use temporary address"),
                   1865:                       NULL, 0, &ip6_use_tempaddr, 0,
                   1866:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1867:                       CTL_CREATE, CTL_EOL);
                   1868:        sysctl_createv(clog, 0, NULL, NULL,
                   1869:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.149.4.1  skrll    1870:                       CTLTYPE_INT, "prefer_tempaddr",
                   1871:                       SYSCTL_DESCR("Prefer temporary address as source "
                   1872:                                    "address"),
                   1873:                       NULL, 0, &ip6_prefer_tempaddr, 0,
                   1874:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1875:                       CTL_CREATE, CTL_EOL);
                   1876:        sysctl_createv(clog, 0, NULL, NULL,
                   1877:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.83      rpaulo   1878:                       CTLTYPE_INT, "temppltime",
                   1879:                       SYSCTL_DESCR("preferred lifetime of a temporary address"),
                   1880:                       NULL, 0, &ip6_temp_preferred_lifetime, 0,
                   1881:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1882:                       CTL_CREATE, CTL_EOL);
                   1883:        sysctl_createv(clog, 0, NULL, NULL,
                   1884:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1885:                       CTLTYPE_INT, "tempvltime",
                   1886:                       SYSCTL_DESCR("valid lifetime of a temporary address"),
                   1887:                       NULL, 0, &ip6_temp_valid_lifetime, 0,
                   1888:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1889:                       CTL_CREATE, CTL_EOL);
                   1890:        sysctl_createv(clog, 0, NULL, NULL,
                   1891:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.74      atatat   1892:                       CTLTYPE_INT, "maxfrags",
                   1893:                       SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1.70      atatat   1894:                       NULL, 0, &ip6_maxfrags, 0,
                   1895:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1896:                       IPV6CTL_MAXFRAGS, CTL_EOL);
1.79      rpaulo   1897:        sysctl_createv(clog, 0, NULL, NULL,
                   1898:                       CTLFLAG_PERMANENT,
                   1899:                       CTLTYPE_STRUCT, "stats",
                   1900:                       SYSCTL_DESCR("IPv6 statistics"),
1.116     thorpej  1901:                       sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1.79      rpaulo   1902:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1903:                       IPV6CTL_STATS, CTL_EOL);
1.81      rpaulo   1904:        sysctl_createv(clog, 0, NULL, NULL,
                   1905:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1906:                       CTLTYPE_INT, "use_defaultzone",
                   1907:                       SYSCTL_DESCR("Whether to use the default scope zones"),
                   1908:                       NULL, 0, &ip6_use_defzone, 0,
                   1909:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1910:                       IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1.83      rpaulo   1911:        sysctl_createv(clog, 0, NULL, NULL,
                   1912:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1913:                       CTLTYPE_INT, "mcast_pmtu",
                   1914:                       SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
                   1915:                       NULL, 0, &ip6_mcast_pmtu, 0,
                   1916:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1917:                       CTL_CREATE, CTL_EOL);
1.149.4.2! skrll    1918: #ifdef GATEWAY
1.98      liamjfoy 1919:        sysctl_createv(clog, 0, NULL, NULL,
                   1920:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1921:                        CTLTYPE_INT, "maxflows",
                   1922:                        SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1.101     liamjfoy 1923:                        sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1.98      liamjfoy 1924:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1925:                        CTL_CREATE, CTL_EOL);
1.99      liamjfoy 1926:        sysctl_createv(clog, 0, NULL, NULL,
                   1927:                        CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1928:                        CTLTYPE_INT, "hashsize",
                   1929:                        SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
                   1930:                        sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
                   1931:                        CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1932:                        CTL_CREATE, CTL_EOL);
1.98      liamjfoy 1933: #endif
1.138     christos 1934:        /* anonportalgo RFC6056 subtree */
1.140     christos 1935:        const struct sysctlnode *portalgo_node;
                   1936:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.138     christos 1937:                       CTLFLAG_PERMANENT,
                   1938:                       CTLTYPE_NODE, "anonportalgo",
                   1939:                       SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"),
                   1940:                       NULL, 0, NULL, 0,
                   1941:                       CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL);
1.140     christos 1942:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.138     christos 1943:                       CTLFLAG_PERMANENT,
                   1944:                       CTLTYPE_STRING, "available",
                   1945:                       SYSCTL_DESCR("available algorithms"),
1.140     christos 1946:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.138     christos 1947:                       CTL_CREATE, CTL_EOL);
1.140     christos 1948:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.138     christos 1949:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1950:                       CTLTYPE_STRING, "selected",
                   1951:                       SYSCTL_DESCR("selected algorithm"),
1.140     christos 1952:                       sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN,
1.138     christos 1953:                       CTL_CREATE, CTL_EOL);
1.141     christos 1954:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1955:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1956:                       CTLTYPE_STRUCT, "reserve",
                   1957:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1958:                       sysctl_portalgo_reserve6, 0, NULL, 0,
                   1959:                       CTL_CREATE, CTL_EOL);
1.139     christos 1960:        sysctl_createv(clog, 0, NULL, NULL,
                   1961:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1962:                       CTLTYPE_INT, "neighborgcthresh",
                   1963:                       SYSCTL_DESCR("Maximum number of entries in neighbor"
                   1964:                        " cache"),
                   1965:                       NULL, 1, &ip6_neighborgcthresh, 0,
                   1966:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1967:                       CTL_CREATE, CTL_EOL);
                   1968:        sysctl_createv(clog, 0, NULL, NULL,
                   1969:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1970:                       CTLTYPE_INT, "maxifprefixes",
                   1971:                       SYSCTL_DESCR("Maximum number of prefixes created by"
                   1972:                           " route advertisement per interface"),
                   1973:                       NULL, 1, &ip6_maxifprefixes, 0,
                   1974:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1975:                       CTL_CREATE, CTL_EOL);
                   1976:        sysctl_createv(clog, 0, NULL, NULL,
                   1977:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1978:                       CTLTYPE_INT, "maxifdefrouters",
                   1979:                       SYSCTL_DESCR("Maximum number of default routers created"
                   1980:                           " by route advertisement per interface"),
                   1981:                       NULL, 1, &ip6_maxifdefrouters, 0,
                   1982:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1983:                       CTL_CREATE, CTL_EOL);
                   1984:        sysctl_createv(clog, 0, NULL, NULL,
                   1985:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1986:                       CTLTYPE_INT, "maxdynroutes",
                   1987:                       SYSCTL_DESCR("Maximum number of routes created via"
                   1988:                           " redirect"),
                   1989:                       NULL, 1, &ip6_maxdynroutes, 0,
                   1990:                       CTL_NET, PF_INET6, IPPROTO_IPV6,
                   1991:                       CTL_CREATE, CTL_EOL);
1.2       itojun   1992: }
1.116     thorpej  1993:
                   1994: void
                   1995: ip6_statinc(u_int stat)
                   1996: {
                   1997:
                   1998:        KASSERT(stat < IP6_NSTATS);
                   1999:        IP6_STATINC(stat);
                   2000: }

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