1 /* $FreeBSD: src/sys/netinet6/ip6_input.c,v 1.11.2.15 2003/01/24 05:11:35 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/ip6_input.c,v 1.25 2005/02/11 22:25:57 joerg Exp $ */
3 /* $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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18 * may be used to endorse or promote products derived from this software
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56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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66 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
69 #include "opt_ip6fw.h"
71 #include "opt_inet6.h"
72 #include "opt_ipsec.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/malloc.h>
78 #include <sys/domain.h>
79 #include <sys/protosw.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
82 #include <sys/errno.h>
84 #include <sys/kernel.h>
85 #include <sys/syslog.h>
88 #include <sys/thread2.h>
89 #include <sys/msgport2.h>
92 #include <net/if_types.h>
93 #include <net/if_dl.h>
94 #include <net/route.h>
95 #include <net/netisr.h>
98 #include <netinet/in.h>
99 #include <netinet/in_systm.h>
101 #include <netinet/ip.h>
102 #include <netinet/ip_icmp.h>
104 #include <netinet/ip6.h>
105 #include <netinet6/in6_var.h>
106 #include <netinet6/ip6_var.h>
107 #include <netinet/in_pcb.h>
108 #include <netinet/icmp6.h>
109 #include <netinet6/scope6_var.h>
110 #include <netinet6/in6_ifattach.h>
111 #include <netinet6/nd6.h>
112 #include <netinet6/in6_prefix.h>
115 #include <netinet6/ipsec.h>
117 #include <netinet6/ipsec6.h>
122 #include <netproto/ipsec/ipsec.h>
123 #include <netproto/ipsec/ipsec6.h>
125 #endif /* FAST_IPSEC */
127 #include <net/ip6fw/ip6_fw.h>
129 #include <netinet6/ip6protosw.h>
131 /* we need it for NLOOP. */
132 #include "use_loop.h"
134 #include <net/net_osdep.h>
136 extern struct domain inet6domain;
137 extern struct ip6protosw inet6sw[];
139 u_char ip6_protox[IPPROTO_MAX];
140 struct in6_ifaddr *in6_ifaddr;
142 extern struct callout in6_tmpaddrtimer_ch;
144 int ip6_forward_srcrt; /* XXX */
145 int ip6_sourcecheck; /* XXX */
146 int ip6_sourcecheck_interval; /* XXX */
148 int ip6_ours_check_algorithm;
150 struct pfil_head inet6_pfil_hook;
153 ip6_fw_chk_t *ip6_fw_chk_ptr;
154 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
155 int ip6_fw_enable = 1;
157 struct ip6stat ip6stat;
159 static void ip6_init2 (void *);
160 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
161 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
162 static int ip6_input(struct netmsg *msg);
164 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
168 * IP6 initialization: fill in IP6 protocol switch table.
169 * All protocols not implemented in kernel go to raw IP6 protocol handler.
174 struct ip6protosw *pr;
179 if (sizeof(struct protosw) != sizeof(struct ip6protosw))
180 panic("sizeof(protosw) != sizeof(ip6protosw)");
182 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
185 for (i = 0; i < IPPROTO_MAX; i++)
186 ip6_protox[i] = pr - inet6sw;
187 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
188 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
189 if (pr->pr_domain->dom_family == PF_INET6 &&
190 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
191 ip6_protox[pr->pr_protocol] = pr - inet6sw;
193 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
194 inet6_pfil_hook.ph_af = AF_INET6;
195 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
196 printf("%s: WARNING: unable to register pfil hook, "
197 "error %d\n", __func__, i);
200 netisr_register(NETISR_IPV6, cpu0_portfn, ip6_input);
205 * in many cases, random() here does NOT return random number
206 * as initialization during bootstrap time occur in fixed order.
209 ip6_flow_seq = random() ^ tv.tv_usec;
211 ip6_desync_factor = (random() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
215 ip6_init2(void *dummy)
218 callout_init(&nd6_timer_ch);
219 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
221 /* router renumbering prefix list maintenance */
222 callout_init(&in6_rr_timer_ch);
223 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
225 /* timer for regeneranation of temporary addresses randomize ID */
226 callout_init(&in6_tmpaddrtimer_ch);
227 callout_reset(&in6_tmpaddrtimer_ch,
228 (ip6_temp_preferred_lifetime - ip6_desync_factor -
229 ip6_temp_regen_advance) * hz,
230 in6_tmpaddrtimer, NULL);
234 /* This must be after route_init(), which is now SI_ORDER_THIRD */
235 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
237 extern struct route_in6 ip6_forward_rt;
241 ip6_input(struct netmsg *msg)
243 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
245 int off = sizeof(struct ip6_hdr), nest;
247 u_int32_t rtalert = ~0;
249 struct ifnet *deliverifp = NULL;
250 struct in6_addr odst;
255 * should the inner packet be considered authentic?
256 * see comment in ah4_input().
259 m->m_flags &= ~M_AUTHIPHDR;
260 m->m_flags &= ~M_AUTHIPDGM;
265 * make sure we don't have onion peering information into m_aux.
272 if (m->m_flags & M_EXT) {
274 ip6stat.ip6s_mext2m++;
276 ip6stat.ip6s_mext1++;
278 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
280 if (m->m_flags & M_LOOP) {
281 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
282 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
283 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
285 ip6stat.ip6s_m2m[0]++;
291 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
292 ip6stat.ip6s_total++;
294 #ifndef PULLDOWN_TEST
296 * L2 bridge code and some other code can return mbuf chain
297 * that does not conform to KAME requirement. too bad.
298 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
300 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
303 MGETHDR(n, MB_DONTWAIT, MT_HEADER);
306 if (n && n->m_pkthdr.len > MHLEN) {
307 MCLGET(n, MB_DONTWAIT);
308 if ((n->m_flags & M_EXT) == 0) {
316 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
317 n->m_len = n->m_pkthdr.len;
321 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), EASYNC);
324 if (m->m_len < sizeof(struct ip6_hdr)) {
326 inifp = m->m_pkthdr.rcvif;
327 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
328 ip6stat.ip6s_toosmall++;
329 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
334 ip6 = mtod(m, struct ip6_hdr *);
336 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
337 ip6stat.ip6s_badvers++;
338 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
343 * Run through list of hooks for input packets.
345 * NB: Beware of the destination address changing
346 * (e.g. by NAT rewriting). When this happens,
347 * tell ip6_forward to do the right thing.
349 if (pfil_has_hooks(&inet6_pfil_hook)) {
351 if (pfil_run_hooks(&inet6_pfil_hook, &m,
352 m->m_pkthdr.rcvif, PFIL_IN)) {
355 if (m == NULL) /* consumed by filter */
357 ip6 = mtod(m, struct ip6_hdr *);
358 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
361 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
364 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
365 /* packet is dropped by traffic conditioner */
371 * Check with the firewall...
373 if (ip6_fw_enable && ip6_fw_chk_ptr) {
375 /* If ipfw says divert, we have to just drop packet */
376 /* use port as a dummy argument */
377 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
386 * Check against address spoofing/corruption.
388 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
389 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
391 * XXX: "badscope" is not very suitable for a multicast source.
393 ip6stat.ip6s_badscope++;
394 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
397 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
398 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
399 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
400 ip6stat.ip6s_badscope++;
401 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
406 * The following check is not documented in specs. A malicious
407 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
408 * and bypass security checks (act as if it was from 127.0.0.1 by using
409 * IPv6 src ::ffff:127.0.0.1). Be cautious.
411 * This check chokes if we are in an SIIT cloud. As none of BSDs
412 * support IPv4-less kernel compilation, we cannot support SIIT
413 * environment at all. So, it makes more sense for us to reject any
414 * malicious packets for non-SIIT environment, than try to do a
415 * partical support for SIIT environment.
417 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
418 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
419 ip6stat.ip6s_badscope++;
420 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
425 * Reject packets with IPv4 compatible addresses (auto tunnel).
427 * The code forbids auto tunnel relay case in RFC1933 (the check is
428 * stronger than RFC1933). We may want to re-enable it if mech-xx
429 * is revised to forbid relaying case.
431 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
432 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
433 ip6stat.ip6s_badscope++;
434 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
439 /* drop packets if interface ID portion is already filled */
440 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
441 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
442 ip6->ip6_src.s6_addr16[1]) {
443 ip6stat.ip6s_badscope++;
446 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
447 ip6->ip6_dst.s6_addr16[1]) {
448 ip6stat.ip6s_badscope++;
453 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
454 ip6->ip6_src.s6_addr16[1]
455 = htons(m->m_pkthdr.rcvif->if_index);
456 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
457 ip6->ip6_dst.s6_addr16[1]
458 = htons(m->m_pkthdr.rcvif->if_index);
460 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
462 * We use rt->rt_ifp to determine if the address is ours or not.
463 * If rt_ifp is lo0, the address is ours.
464 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
465 * so any address under fe80::%lo0/64 will be mistakenly considered
466 * local. The special case is supplied to handle the case properly
467 * by actually looking at interface addresses
468 * (using in6ifa_ifpwithaddr).
470 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
471 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
472 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
473 icmp6_error(m, ICMP6_DST_UNREACH,
474 ICMP6_DST_UNREACH_ADDR, 0);
475 /* m is already freed */
480 deliverifp = m->m_pkthdr.rcvif;
488 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
489 struct in6_multi *in6m = 0;
491 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
493 * See if we belong to the destination multicast group on the
496 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
499 else if (!ip6_mrouter) {
500 ip6stat.ip6s_notmember++;
501 ip6stat.ip6s_cantforward++;
502 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
505 deliverifp = m->m_pkthdr.rcvif;
512 switch (ip6_ours_check_algorithm) {
515 * XXX: I intentionally broke our indentation rule here,
516 * since this switch-case is just for measurement and
517 * therefore should soon be removed.
519 if (ip6_forward_rt.ro_rt != NULL &&
520 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
521 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
522 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
523 ip6stat.ip6s_forward_cachehit++;
525 struct sockaddr_in6 *dst6;
527 if (ip6_forward_rt.ro_rt) {
528 /* route is down or destination is different */
529 ip6stat.ip6s_forward_cachemiss++;
530 RTFREE(ip6_forward_rt.ro_rt);
531 ip6_forward_rt.ro_rt = 0;
534 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
535 dst6 = &ip6_forward_rt.ro_dst;
536 dst6->sin6_len = sizeof(struct sockaddr_in6);
537 dst6->sin6_family = AF_INET6;
538 dst6->sin6_addr = ip6->ip6_dst;
540 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
543 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
546 * Accept the packet if the forwarding interface to the destination
547 * according to the routing table is the loopback interface,
548 * unless the associated route has a gateway.
549 * Note that this approach causes to accept a packet if there is a
550 * route to the loopback interface for the destination of the packet.
551 * But we think it's even useful in some situations, e.g. when using
552 * a special daemon which wants to intercept the packet.
554 * XXX: some OSes automatically make a cloned route for the destination
555 * of an outgoing packet. If the outgoing interface of the packet
556 * is a loopback one, the kernel would consider the packet to be
557 * accepted, even if we have no such address assinged on the interface.
558 * We check the cloned flag of the route entry to reject such cases,
559 * assuming that route entries for our own addresses are not made by
560 * cloning (it should be true because in6_addloop explicitly installs
561 * the host route). However, we might have to do an explicit check
562 * while it would be less efficient. Or, should we rather install a
563 * reject route for such a case?
565 if (ip6_forward_rt.ro_rt &&
566 (ip6_forward_rt.ro_rt->rt_flags &
567 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
569 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
572 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
576 * The check below is redundant since the comparison of
577 * the destination and the key of the rtentry has
578 * already done through looking up the routing table.
580 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
581 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
583 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
584 struct in6_ifaddr *ia6 =
585 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
588 * record address information into m_aux.
590 (void)ip6_setdstifaddr(m, ia6);
593 * packets to a tentative, duplicated, or somehow invalid
594 * address must not be accepted.
596 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
597 /* this address is ready */
599 deliverifp = ia6->ia_ifp; /* correct? */
600 /* Count the packet in the ip address stats */
601 ia6->ia_ifa.if_ipackets++;
602 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
605 /* address is not ready, so discard the packet. */
607 "ip6_input: packet to an unready address %s->%s\n",
608 ip6_sprintf(&ip6->ip6_src),
609 ip6_sprintf(&ip6->ip6_dst)));
614 } /* XXX indentation (see above) */
617 * FAITH(Firewall Aided Internet Translator)
620 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
621 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
622 /* XXX do we need more sanity checks? */
624 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
630 * Now there is no reason to process the packet if it's not our own
631 * and we're not a router.
633 if (!ip6_forwarding) {
634 ip6stat.ip6s_cantforward++;
635 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
641 * record address information into m_aux, if we don't have one yet.
642 * note that we are unable to record it, if the address is not listed
643 * as our interface address (e.g. multicast addresses, addresses
644 * within FAITH prefixes and such).
646 if (deliverifp && !ip6_getdstifaddr(m)) {
647 struct in6_ifaddr *ia6;
649 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
651 if (!ip6_setdstifaddr(m, ia6)) {
653 * XXX maybe we should drop the packet here,
654 * as we could not provide enough information
655 * to the upper layers.
662 * Process Hop-by-Hop options header if it's contained.
663 * m may be modified in ip6_hopopts_input().
664 * If a JumboPayload option is included, plen will also be modified.
666 plen = (u_int32_t)ntohs(ip6->ip6_plen);
667 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
670 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
671 #if 0 /*touches NULL pointer*/
672 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
674 goto bad2; /* m have already been freed */
678 ip6 = mtod(m, struct ip6_hdr *);
681 * if the payload length field is 0 and the next header field
682 * indicates Hop-by-Hop Options header, then a Jumbo Payload
683 * option MUST be included.
685 if (ip6->ip6_plen == 0 && plen == 0) {
687 * Note that if a valid jumbo payload option is
688 * contained, ip6_hoptops_input() must set a valid
689 * (non-zero) payload length to the variable plen.
691 ip6stat.ip6s_badoptions++;
692 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
693 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
694 icmp6_error(m, ICMP6_PARAM_PROB,
695 ICMP6_PARAMPROB_HEADER,
696 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
699 #ifndef PULLDOWN_TEST
700 /* ip6_hopopts_input() ensures that mbuf is contiguous */
701 hbh = (struct ip6_hbh *)(ip6 + 1);
703 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
704 sizeof(struct ip6_hbh));
706 ip6stat.ip6s_tooshort++;
713 * accept the packet if a router alert option is included
714 * and we act as an IPv6 router.
716 if (rtalert != ~0 && ip6_forwarding)
722 * Check that the amount of data in the buffers
723 * is as at least much as the IPv6 header would have us expect.
724 * Trim mbufs if longer than we expect.
725 * Drop packet if shorter than we expect.
727 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
728 ip6stat.ip6s_tooshort++;
729 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
732 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
733 if (m->m_len == m->m_pkthdr.len) {
734 m->m_len = sizeof(struct ip6_hdr) + plen;
735 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
737 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
741 * Forward if desirable.
743 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
745 * If we are acting as a multicast router, all
746 * incoming multicast packets are passed to the
747 * kernel-level multicast forwarding function.
748 * The packet is returned (relatively) intact; if
749 * ip6_mforward() returns a non-zero value, the packet
750 * must be discarded, else it may be accepted below.
752 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
753 ip6stat.ip6s_cantforward++;
759 ip6_forward(m, srcrt);
763 ip6 = mtod(m, struct ip6_hdr *);
766 * Malicious party may be able to use IPv4 mapped addr to confuse
767 * tcp/udp stack and bypass security checks (act as if it was from
768 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
770 * For SIIT end node behavior, you may want to disable the check.
771 * However, you will become vulnerable to attacks using IPv4 mapped
774 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
775 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
776 ip6stat.ip6s_badscope++;
777 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
782 * Tell launch routine the next header
784 ip6stat.ip6s_delivered++;
785 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
788 while (nxt != IPPROTO_DONE) {
789 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
790 ip6stat.ip6s_toomanyhdr++;
795 * protection against faulty packet - there should be
796 * more sanity checks in header chain processing.
798 if (m->m_pkthdr.len < off) {
799 ip6stat.ip6s_tooshort++;
800 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
806 * do we need to do it for every header? yeah, other
807 * functions can play with it (like re-allocate and copy).
809 mhist = ip6_addaux(m);
810 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
811 hist = mtod(mhist, caddr_t) + mhist->m_len;
812 bcopy(&nxt, hist, sizeof(nxt));
813 mhist->m_len += sizeof(nxt);
815 ip6stat.ip6s_toomanyhdr++;
822 * enforce IPsec policy checking if we are seeing last header.
823 * note that we do not visit this with protocols with pcb layer
824 * code - like udp/tcp/raw ip.
826 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
827 ipsec6_in_reject(m, NULL)) {
828 ipsec6stat.in_polvio++;
833 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
839 lwkt_replymsg(&msg->nm_lmsg, 0);
844 * set/grab in6_ifaddr correspond to IPv6 destination address.
845 * XXX backward compatibility wrapper
847 static struct ip6aux *
848 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
854 n->ip6a_dstia6 = ia6;
855 return n; /* NULL if failed to set */
859 ip6_getdstifaddr(struct mbuf *m)
865 return n->ip6a_dstia6;
871 * Hop-by-Hop options header processing. If a valid jumbo payload option is
872 * included, the real payload length will be stored in plenp.
875 ip6_hopopts_input(u_int32_t *plenp,
876 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
880 struct mbuf *m = *mp;
881 int off = *offp, hbhlen;
885 /* validation of the length of the header */
886 #ifndef PULLDOWN_TEST
887 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
888 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
889 hbhlen = (hbh->ip6h_len + 1) << 3;
891 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
892 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
894 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
895 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
897 ip6stat.ip6s_tooshort++;
900 hbhlen = (hbh->ip6h_len + 1) << 3;
901 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
904 ip6stat.ip6s_tooshort++;
909 hbhlen -= sizeof(struct ip6_hbh);
910 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
912 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
913 hbhlen, rtalertp, plenp) < 0)
922 * Search header for all Hop-by-hop options and process each option.
923 * This function is separate from ip6_hopopts_input() in order to
924 * handle a case where the sending node itself process its hop-by-hop
925 * options header. In such a case, the function is called from ip6_output().
927 * The function assumes that hbh header is located right after the IPv6 header
928 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
929 * opthead + hbhlen is located in continuous memory region.
932 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
933 u_int32_t *rtalertp, u_int32_t *plenp)
937 u_int8_t *opt = opthead;
938 u_int16_t rtalert_val;
940 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
942 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
948 if (hbhlen < IP6OPT_MINLEN) {
949 ip6stat.ip6s_toosmall++;
952 optlen = *(opt + 1) + 2;
955 /* XXX may need check for alignment */
956 if (hbhlen < IP6OPT_RTALERT_LEN) {
957 ip6stat.ip6s_toosmall++;
960 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
962 icmp6_error(m, ICMP6_PARAM_PROB,
963 ICMP6_PARAMPROB_HEADER,
964 erroff + opt + 1 - opthead);
967 optlen = IP6OPT_RTALERT_LEN;
968 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
969 *rtalertp = ntohs(rtalert_val);
972 /* XXX may need check for alignment */
973 if (hbhlen < IP6OPT_JUMBO_LEN) {
974 ip6stat.ip6s_toosmall++;
977 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
979 icmp6_error(m, ICMP6_PARAM_PROB,
980 ICMP6_PARAMPROB_HEADER,
981 erroff + opt + 1 - opthead);
984 optlen = IP6OPT_JUMBO_LEN;
987 * IPv6 packets that have non 0 payload length
988 * must not contain a jumbo payload option.
990 ip6 = mtod(m, struct ip6_hdr *);
992 ip6stat.ip6s_badoptions++;
993 icmp6_error(m, ICMP6_PARAM_PROB,
994 ICMP6_PARAMPROB_HEADER,
995 erroff + opt - opthead);
1000 * We may see jumbolen in unaligned location, so
1001 * we'd need to perform bcopy().
1003 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1004 jumboplen = (u_int32_t)htonl(jumboplen);
1008 * if there are multiple jumbo payload options,
1009 * *plenp will be non-zero and the packet will be
1011 * the behavior may need some debate in ipngwg -
1012 * multiple options does not make sense, however,
1013 * there's no explicit mention in specification.
1016 ip6stat.ip6s_badoptions++;
1017 icmp6_error(m, ICMP6_PARAM_PROB,
1018 ICMP6_PARAMPROB_HEADER,
1019 erroff + opt + 2 - opthead);
1025 * jumbo payload length must be larger than 65535.
1027 if (jumboplen <= IPV6_MAXPACKET) {
1028 ip6stat.ip6s_badoptions++;
1029 icmp6_error(m, ICMP6_PARAM_PROB,
1030 ICMP6_PARAMPROB_HEADER,
1031 erroff + opt + 2 - opthead);
1037 default: /* unknown option */
1038 if (hbhlen < IP6OPT_MINLEN) {
1039 ip6stat.ip6s_toosmall++;
1042 optlen = ip6_unknown_opt(opt, m,
1043 erroff + opt - opthead);
1059 * Unknown option processing.
1060 * The third argument `off' is the offset from the IPv6 header to the option,
1061 * which is necessary if the IPv6 header the and option header and IPv6 header
1062 * is not continuous in order to return an ICMPv6 error.
1065 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1067 struct ip6_hdr *ip6;
1069 switch (IP6OPT_TYPE(*optp)) {
1070 case IP6OPT_TYPE_SKIP: /* ignore the option */
1071 return((int)*(optp + 1));
1072 case IP6OPT_TYPE_DISCARD: /* silently discard */
1075 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1076 ip6stat.ip6s_badoptions++;
1077 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1079 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1080 ip6stat.ip6s_badoptions++;
1081 ip6 = mtod(m, struct ip6_hdr *);
1082 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1083 (m->m_flags & (M_BCAST|M_MCAST)))
1086 icmp6_error(m, ICMP6_PARAM_PROB,
1087 ICMP6_PARAMPROB_OPTION, off);
1091 m_freem(m); /* XXX: NOTREACHED */
1096 * Create the "control" list for this pcb.
1097 * The function will not modify mbuf chain at all.
1099 * with KAME mbuf chain restriction:
1100 * The routine will be called from upper layer handlers like tcp6_input().
1101 * Thus the routine assumes that the caller (tcp6_input) have already
1102 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1103 * very first mbuf on the mbuf chain.
1106 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1109 struct thread *td = curthread; /* XXX */
1111 int rthdr_exist = 0;
1118 if ((in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0) {
1122 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1123 SCM_TIMESTAMP, SOL_SOCKET);
1125 mp = &(*mp)->m_next;
1130 /* RFC 2292 sec. 5 */
1131 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1132 struct in6_pktinfo pi6;
1133 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1134 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1135 pi6.ipi6_addr.s6_addr16[1] = 0;
1136 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1137 ? m->m_pkthdr.rcvif->if_index
1139 *mp = sbcreatecontrol((caddr_t) &pi6,
1140 sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1143 mp = &(*mp)->m_next;
1146 if ((in6p->in6p_flags & IN6P_HOPLIMIT) != 0) {
1147 int hlim = ip6->ip6_hlim & 0xff;
1148 *mp = sbcreatecontrol((caddr_t) &hlim,
1149 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1151 mp = &(*mp)->m_next;
1155 * IPV6_HOPOPTS socket option. We require super-user privilege
1156 * for the option, but it might be too strict, since there might
1157 * be some hop-by-hop options which can be returned to normal user.
1158 * See RFC 2292 section 6.
1160 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1162 * Check if a hop-by-hop options header is contatined in the
1163 * received packet, and if so, store the options as ancillary
1164 * data. Note that a hop-by-hop options header must be
1165 * just after the IPv6 header, which fact is assured through
1166 * the IPv6 input processing.
1168 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1169 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1170 struct ip6_hbh *hbh;
1172 #ifdef PULLDOWN_TEST
1176 #ifndef PULLDOWN_TEST
1177 hbh = (struct ip6_hbh *)(ip6 + 1);
1178 hbhlen = (hbh->ip6h_len + 1) << 3;
1180 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1183 ip6stat.ip6s_tooshort++;
1186 hbh = mtod(ext, struct ip6_hbh *);
1187 hbhlen = (hbh->ip6h_len + 1) << 3;
1188 if (hbhlen != ext->m_len) {
1190 ip6stat.ip6s_tooshort++;
1196 * XXX: We copy whole the header even if a jumbo
1197 * payload option is included, which option is to
1198 * be removed before returning in the RFC 2292.
1199 * Note: this constraint is removed in 2292bis.
1201 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1202 IPV6_HOPOPTS, IPPROTO_IPV6);
1204 mp = &(*mp)->m_next;
1205 #ifdef PULLDOWN_TEST
1211 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1212 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1213 int proto, off, nxt;
1216 * go through the header chain to see if a routing header is
1217 * contained in the packet. We need this information to store
1218 * destination options headers (if any) properly.
1219 * XXX: performance issue. We should record this info when
1220 * processing extension headers in incoming routine.
1223 proto = IPPROTO_IPV6;
1229 newoff = ip6_nexthdr(m, off, proto, &nxt);
1232 if (newoff < off) /* invalid, check for safety */
1234 if ((proto = nxt) == IPPROTO_ROUTING) {
1242 if ((in6p->in6p_flags &
1243 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1244 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1245 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1248 * Search for destination options headers or routing
1249 * header(s) through the header chain, and stores each
1250 * header as ancillary data.
1251 * Note that the order of the headers remains in
1252 * the chain of ancillary data.
1254 while (1) { /* is explicit loop prevention necessary? */
1255 struct ip6_ext *ip6e = NULL;
1257 #ifdef PULLDOWN_TEST
1258 struct mbuf *ext = NULL;
1262 * if it is not an extension header, don't try to
1263 * pull it from the chain.
1266 case IPPROTO_DSTOPTS:
1267 case IPPROTO_ROUTING:
1268 case IPPROTO_HOPOPTS:
1269 case IPPROTO_AH: /* is it possible? */
1275 #ifndef PULLDOWN_TEST
1276 if (off + sizeof(*ip6e) > m->m_len)
1278 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1279 if (nxt == IPPROTO_AH)
1280 elen = (ip6e->ip6e_len + 2) << 2;
1282 elen = (ip6e->ip6e_len + 1) << 3;
1283 if (off + elen > m->m_len)
1286 ext = ip6_pullexthdr(m, off, nxt);
1288 ip6stat.ip6s_tooshort++;
1291 ip6e = mtod(ext, struct ip6_ext *);
1292 if (nxt == IPPROTO_AH)
1293 elen = (ip6e->ip6e_len + 2) << 2;
1295 elen = (ip6e->ip6e_len + 1) << 3;
1296 if (elen != ext->m_len) {
1298 ip6stat.ip6s_tooshort++;
1304 case IPPROTO_DSTOPTS:
1305 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1309 * We also require super-user privilege for
1311 * See the comments on IN6_HOPOPTS.
1316 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1320 mp = &(*mp)->m_next;
1322 case IPPROTO_ROUTING:
1323 if (!in6p->in6p_flags & IN6P_RTHDR)
1326 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1330 mp = &(*mp)->m_next;
1332 case IPPROTO_HOPOPTS:
1333 case IPPROTO_AH: /* is it possible? */
1338 * other cases have been filtered in the above.
1339 * none will visit this case. here we supply
1340 * the code just in case (nxt overwritten or
1343 #ifdef PULLDOWN_TEST
1350 /* proceed with the next header. */
1352 nxt = ip6e->ip6e_nxt;
1354 #ifdef PULLDOWN_TEST
1365 #ifdef PULLDOWN_TEST
1367 * pull single extension header from mbuf chain. returns single mbuf that
1368 * contains the result, or NULL on error.
1370 static struct mbuf *
1371 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1373 struct ip6_ext ip6e;
1379 case IPPROTO_DSTOPTS:
1380 case IPPROTO_ROUTING:
1381 case IPPROTO_HOPOPTS:
1382 case IPPROTO_AH: /* is it possible? */
1385 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1389 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1390 if (nxt == IPPROTO_AH)
1391 elen = (ip6e.ip6e_len + 2) << 2;
1393 elen = (ip6e.ip6e_len + 1) << 3;
1395 MGET(n, MB_DONTWAIT, MT_DATA);
1396 if (n && elen >= MLEN) {
1397 MCLGET(n, MB_DONTWAIT);
1398 if ((n->m_flags & M_EXT) == 0) {
1407 if (elen >= M_TRAILINGSPACE(n)) {
1412 m_copydata(m, off, elen, mtod(n, caddr_t));
1419 * Get pointer to the previous header followed by the header
1420 * currently processed.
1421 * XXX: This function supposes that
1422 * M includes all headers,
1423 * the next header field and the header length field of each header
1425 * the sum of each header length equals to OFF.
1426 * Because of these assumptions, this function must be called very
1427 * carefully. Moreover, it will not be used in the near future when
1428 * we develop `neater' mechanism to process extension headers.
1431 ip6_get_prevhdr(struct mbuf *m, int off)
1433 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1435 if (off == sizeof(struct ip6_hdr))
1436 return(&ip6->ip6_nxt);
1439 struct ip6_ext *ip6e = NULL;
1442 len = sizeof(struct ip6_hdr);
1444 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1447 case IPPROTO_FRAGMENT:
1448 len += sizeof(struct ip6_frag);
1451 len += (ip6e->ip6e_len + 2) << 2;
1454 len += (ip6e->ip6e_len + 1) << 3;
1457 nxt = ip6e->ip6e_nxt;
1460 return(&ip6e->ip6e_nxt);
1467 * get next header offset. m will be retained.
1470 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1473 struct ip6_ext ip6e;
1478 panic("ip6_nexthdr: m == NULL");
1479 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1484 if (m->m_pkthdr.len < off + sizeof(ip6))
1486 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1488 *nxtp = ip6.ip6_nxt;
1492 case IPPROTO_FRAGMENT:
1494 * terminate parsing if it is not the first fragment,
1495 * it does not make sense to parse through it.
1497 if (m->m_pkthdr.len < off + sizeof(fh))
1499 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1500 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1501 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1504 *nxtp = fh.ip6f_nxt;
1505 off += sizeof(struct ip6_frag);
1509 if (m->m_pkthdr.len < off + sizeof(ip6e))
1511 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1513 *nxtp = ip6e.ip6e_nxt;
1514 off += (ip6e.ip6e_len + 2) << 2;
1517 case IPPROTO_HOPOPTS:
1518 case IPPROTO_ROUTING:
1519 case IPPROTO_DSTOPTS:
1520 if (m->m_pkthdr.len < off + sizeof(ip6e))
1522 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1524 *nxtp = ip6e.ip6e_nxt;
1525 off += (ip6e.ip6e_len + 1) << 3;
1530 case IPPROTO_IPCOMP:
1542 * get offset for the last header in the chain. m will be kept untainted.
1545 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1555 newoff = ip6_nexthdr(m, off, proto, nxtp);
1558 else if (newoff < off)
1559 return -1; /* invalid */
1560 else if (newoff == off)
1569 ip6_addaux(struct mbuf *m)
1571 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1573 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1574 sizeof (struct ip6aux),
1577 m_tag_prepend(m, tag);
1580 bzero(tag+1, sizeof (struct ip6aux));
1581 return tag ? (struct ip6aux*)(tag+1) : NULL;
1585 ip6_findaux(struct mbuf *m)
1587 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1588 return tag ? (struct ip6aux*)(tag+1) : NULL;
1592 ip6_delaux(struct mbuf *m)
1594 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1596 m_tag_delete(m, tag);
1600 * System control for IP6
1603 u_char inet6ctlerrmap[PRC_NCMDS] = {
1605 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1606 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1607 EMSGSIZE, EHOSTUNREACH, 0, 0,