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 1.38 2008/09/24 14:26:39 sephe 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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56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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 void 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 kprintf("%s: WARNING: unable to register pfil hook, "
197 "error %d\n", __func__, i);
200 netisr_register(NETISR_IPV6, cpu0_portfn, ip6_input,
201 NETISR_FLAG_NOTMPSAFE);
206 * in many cases, random() here does NOT return random number
207 * as initialization during bootstrap time occur in fixed order.
210 ip6_flow_seq = krandom() ^ tv.tv_usec;
212 ip6_desync_factor = (krandom() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
216 ip6_init2(void *dummy)
219 callout_init(&nd6_timer_ch);
220 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
222 /* router renumbering prefix list maintenance */
223 callout_init(&in6_rr_timer_ch);
224 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
226 /* timer for regeneranation of temporary addresses randomize ID */
227 callout_init(&in6_tmpaddrtimer_ch);
228 callout_reset(&in6_tmpaddrtimer_ch,
229 (ip6_temp_preferred_lifetime - ip6_desync_factor -
230 ip6_temp_regen_advance) * hz,
231 in6_tmpaddrtimer, NULL);
235 /* This must be after route_init(), which is now SI_ORDER_THIRD */
236 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
238 extern struct route_in6 ip6_forward_rt;
242 ip6_input(struct netmsg *msg)
244 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
246 int off = sizeof(struct ip6_hdr), nest;
248 u_int32_t rtalert = ~0;
249 int nxt, ours = 0, rh_present = 0;
250 struct ifnet *deliverifp = NULL;
251 struct in6_addr odst;
256 * should the inner packet be considered authentic?
257 * see comment in ah4_input().
260 m->m_flags &= ~M_AUTHIPHDR;
261 m->m_flags &= ~M_AUTHIPDGM;
266 * make sure we don't have onion peering information into m_aux.
273 if (m->m_flags & M_EXT) {
275 ip6stat.ip6s_mext2m++;
277 ip6stat.ip6s_mext1++;
279 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
281 if (m->m_flags & M_LOOP) {
282 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
283 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
284 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
286 ip6stat.ip6s_m2m[0]++;
292 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
293 ip6stat.ip6s_total++;
295 #ifndef PULLDOWN_TEST
297 * L2 bridge code and some other code can return mbuf chain
298 * that does not conform to KAME requirement. too bad.
299 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
301 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
304 n = m_getb(m->m_pkthdr.len, MB_DONTWAIT, MT_HEADER, M_PKTHDR);
309 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
310 n->m_len = n->m_pkthdr.len;
314 IP6_EXTHDR_CHECK_VOIDRET(m, 0, sizeof(struct ip6_hdr));
317 if (m->m_len < sizeof(struct ip6_hdr)) {
319 inifp = m->m_pkthdr.rcvif;
320 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
321 ip6stat.ip6s_toosmall++;
322 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
327 ip6 = mtod(m, struct ip6_hdr *);
329 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
330 ip6stat.ip6s_badvers++;
331 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
336 * Run through list of hooks for input packets.
338 * NB: Beware of the destination address changing
339 * (e.g. by NAT rewriting). When this happens,
340 * tell ip6_forward to do the right thing.
342 if (pfil_has_hooks(&inet6_pfil_hook)) {
344 if (pfil_run_hooks(&inet6_pfil_hook, &m,
345 m->m_pkthdr.rcvif, PFIL_IN)) {
348 if (m == NULL) /* consumed by filter */
350 ip6 = mtod(m, struct ip6_hdr *);
351 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
354 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
357 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
358 /* packet is dropped by traffic conditioner */
364 * Check with the firewall...
366 if (ip6_fw_enable && ip6_fw_chk_ptr) {
368 /* If ipfw says divert, we have to just drop packet */
369 /* use port as a dummy argument */
370 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
379 * Check against address spoofing/corruption.
381 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
382 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
384 * XXX: "badscope" is not very suitable for a multicast source.
386 ip6stat.ip6s_badscope++;
387 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
390 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
391 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
392 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
393 ip6stat.ip6s_badscope++;
394 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
399 * The following check is not documented in specs. A malicious
400 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
401 * and bypass security checks (act as if it was from 127.0.0.1 by using
402 * IPv6 src ::ffff:127.0.0.1). Be cautious.
404 * This check chokes if we are in an SIIT cloud. As none of BSDs
405 * support IPv4-less kernel compilation, we cannot support SIIT
406 * environment at all. So, it makes more sense for us to reject any
407 * malicious packets for non-SIIT environment, than try to do a
408 * partical support for SIIT environment.
410 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
411 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
412 ip6stat.ip6s_badscope++;
413 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
418 * Reject packets with IPv4 compatible addresses (auto tunnel).
420 * The code forbids auto tunnel relay case in RFC1933 (the check is
421 * stronger than RFC1933). We may want to re-enable it if mech-xx
422 * is revised to forbid relaying case.
424 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
425 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
426 ip6stat.ip6s_badscope++;
427 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
432 /* drop packets if interface ID portion is already filled */
433 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
434 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
435 ip6->ip6_src.s6_addr16[1]) {
436 ip6stat.ip6s_badscope++;
439 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
440 ip6->ip6_dst.s6_addr16[1]) {
441 ip6stat.ip6s_badscope++;
446 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
447 ip6->ip6_src.s6_addr16[1]
448 = htons(m->m_pkthdr.rcvif->if_index);
449 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
450 ip6->ip6_dst.s6_addr16[1]
451 = htons(m->m_pkthdr.rcvif->if_index);
453 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
455 * We use rt->rt_ifp to determine if the address is ours or not.
456 * If rt_ifp is lo0, the address is ours.
457 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
458 * so any address under fe80::%lo0/64 will be mistakenly considered
459 * local. The special case is supplied to handle the case properly
460 * by actually looking at interface addresses
461 * (using in6ifa_ifpwithaddr).
463 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
464 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
465 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
466 icmp6_error(m, ICMP6_DST_UNREACH,
467 ICMP6_DST_UNREACH_ADDR, 0);
468 /* m is already freed */
473 deliverifp = m->m_pkthdr.rcvif;
481 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
482 struct in6_multi *in6m = 0;
484 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
486 * See if we belong to the destination multicast group on the
489 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
492 else if (!ip6_mrouter) {
493 ip6stat.ip6s_notmember++;
494 ip6stat.ip6s_cantforward++;
495 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
498 deliverifp = m->m_pkthdr.rcvif;
505 switch (ip6_ours_check_algorithm) {
508 * XXX: I intentionally broke our indentation rule here,
509 * since this switch-case is just for measurement and
510 * therefore should soon be removed.
512 if (ip6_forward_rt.ro_rt != NULL &&
513 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
514 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
515 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
516 ip6stat.ip6s_forward_cachehit++;
518 struct sockaddr_in6 *dst6;
520 if (ip6_forward_rt.ro_rt) {
521 /* route is down or destination is different */
522 ip6stat.ip6s_forward_cachemiss++;
523 RTFREE(ip6_forward_rt.ro_rt);
524 ip6_forward_rt.ro_rt = 0;
527 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
528 dst6 = &ip6_forward_rt.ro_dst;
529 dst6->sin6_len = sizeof(struct sockaddr_in6);
530 dst6->sin6_family = AF_INET6;
531 dst6->sin6_addr = ip6->ip6_dst;
533 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
536 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
539 * Accept the packet if the forwarding interface to the destination
540 * according to the routing table is the loopback interface,
541 * unless the associated route has a gateway.
542 * Note that this approach causes to accept a packet if there is a
543 * route to the loopback interface for the destination of the packet.
544 * But we think it's even useful in some situations, e.g. when using
545 * a special daemon which wants to intercept the packet.
547 * XXX: some OSes automatically make a cloned route for the destination
548 * of an outgoing packet. If the outgoing interface of the packet
549 * is a loopback one, the kernel would consider the packet to be
550 * accepted, even if we have no such address assinged on the interface.
551 * We check the cloned flag of the route entry to reject such cases,
552 * assuming that route entries for our own addresses are not made by
553 * cloning (it should be true because in6_addloop explicitly installs
554 * the host route). However, we might have to do an explicit check
555 * while it would be less efficient. Or, should we rather install a
556 * reject route for such a case?
558 if (ip6_forward_rt.ro_rt &&
559 (ip6_forward_rt.ro_rt->rt_flags &
560 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
562 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
565 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
569 * The check below is redundant since the comparison of
570 * the destination and the key of the rtentry has
571 * already done through looking up the routing table.
573 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
574 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
576 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
577 struct in6_ifaddr *ia6 =
578 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
581 * record address information into m_aux.
583 ip6_setdstifaddr(m, ia6);
586 * packets to a tentative, duplicated, or somehow invalid
587 * address must not be accepted.
589 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
590 /* this address is ready */
592 deliverifp = ia6->ia_ifp; /* correct? */
593 /* Count the packet in the ip address stats */
594 ia6->ia_ifa.if_ipackets++;
595 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
598 /* address is not ready, so discard the packet. */
600 "ip6_input: packet to an unready address %s->%s\n",
601 ip6_sprintf(&ip6->ip6_src),
602 ip6_sprintf(&ip6->ip6_dst)));
607 } /* XXX indentation (see above) */
610 * FAITH(Firewall Aided Internet Translator)
613 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
614 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
615 /* XXX do we need more sanity checks? */
617 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
623 * Now there is no reason to process the packet if it's not our own
624 * and we're not a router.
626 if (!ip6_forwarding) {
627 ip6stat.ip6s_cantforward++;
628 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
634 * record address information into m_aux, if we don't have one yet.
635 * note that we are unable to record it, if the address is not listed
636 * as our interface address (e.g. multicast addresses, addresses
637 * within FAITH prefixes and such).
639 if (deliverifp && !ip6_getdstifaddr(m)) {
640 struct in6_ifaddr *ia6;
642 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
644 if (!ip6_setdstifaddr(m, ia6)) {
646 * XXX maybe we should drop the packet here,
647 * as we could not provide enough information
648 * to the upper layers.
655 * Process Hop-by-Hop options header if it's contained.
656 * m may be modified in ip6_hopopts_input().
657 * If a JumboPayload option is included, plen will also be modified.
659 plen = (u_int32_t)ntohs(ip6->ip6_plen);
660 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
663 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
664 #if 0 /*touches NULL pointer*/
665 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
667 goto bad2; /* m have already been freed */
671 ip6 = mtod(m, struct ip6_hdr *);
674 * if the payload length field is 0 and the next header field
675 * indicates Hop-by-Hop Options header, then a Jumbo Payload
676 * option MUST be included.
678 if (ip6->ip6_plen == 0 && plen == 0) {
680 * Note that if a valid jumbo payload option is
681 * contained, ip6_hoptops_input() must set a valid
682 * (non-zero) payload length to the variable plen.
684 ip6stat.ip6s_badoptions++;
685 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
686 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
687 icmp6_error(m, ICMP6_PARAM_PROB,
688 ICMP6_PARAMPROB_HEADER,
689 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
692 #ifndef PULLDOWN_TEST
693 /* ip6_hopopts_input() ensures that mbuf is contiguous */
694 hbh = (struct ip6_hbh *)(ip6 + 1);
696 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
697 sizeof(struct ip6_hbh));
699 ip6stat.ip6s_tooshort++;
706 * If we are acting as a router and the packet contains a
707 * router alert option, see if we know the option value.
708 * Currently, we only support the option value for MLD, in which
709 * case we should pass the packet to the multicast routing
712 if (rtalert != ~0 && ip6_forwarding) {
714 case IP6OPT_RTALERT_MLD:
719 * RFC2711 requires unrecognized values must be
729 * Check that the amount of data in the buffers
730 * is as at least much as the IPv6 header would have us expect.
731 * Trim mbufs if longer than we expect.
732 * Drop packet if shorter than we expect.
734 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
735 ip6stat.ip6s_tooshort++;
736 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
739 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
740 if (m->m_len == m->m_pkthdr.len) {
741 m->m_len = sizeof(struct ip6_hdr) + plen;
742 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
744 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
748 * Forward if desirable.
750 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
752 * If we are acting as a multicast router, all
753 * incoming multicast packets are passed to the
754 * kernel-level multicast forwarding function.
755 * The packet is returned (relatively) intact; if
756 * ip6_mforward() returns a non-zero value, the packet
757 * must be discarded, else it may be accepted below.
759 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
760 ip6stat.ip6s_cantforward++;
766 ip6_forward(m, srcrt);
770 ip6 = mtod(m, struct ip6_hdr *);
773 * Malicious party may be able to use IPv4 mapped addr to confuse
774 * tcp/udp stack and bypass security checks (act as if it was from
775 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
777 * For SIIT end node behavior, you may want to disable the check.
778 * However, you will become vulnerable to attacks using IPv4 mapped
781 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
782 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
783 ip6stat.ip6s_badscope++;
784 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
789 * Tell launch routine the next header
791 ip6stat.ip6s_delivered++;
792 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
796 while (nxt != IPPROTO_DONE) {
797 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
798 ip6stat.ip6s_toomanyhdr++;
799 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
804 * protection against faulty packet - there should be
805 * more sanity checks in header chain processing.
807 if (m->m_pkthdr.len < off) {
808 ip6stat.ip6s_tooshort++;
809 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
815 * do we need to do it for every header? yeah, other
816 * functions can play with it (like re-allocate and copy).
818 mhist = ip6_addaux(m);
819 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
820 hist = mtod(mhist, caddr_t) + mhist->m_len;
821 bcopy(&nxt, hist, sizeof(nxt));
822 mhist->m_len += sizeof(nxt);
824 ip6stat.ip6s_toomanyhdr++;
829 if (nxt == IPPROTO_ROUTING) {
831 in6_ifstat_inc(m->m_pkthdr.rcvif,
833 ip6stat.ip6s_badoptions++;
840 * enforce IPsec policy checking if we are seeing last header.
841 * note that we do not visit this with protocols with pcb layer
842 * code - like udp/tcp/raw ip.
844 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) &&
845 ipsec6_in_reject(m, NULL)) {
846 ipsec6stat.in_polvio++;
851 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
858 /* msg was embedded in the mbuf, do not reply! */
862 * set/grab in6_ifaddr correspond to IPv6 destination address.
863 * XXX backward compatibility wrapper
865 static struct ip6aux *
866 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
872 n->ip6a_dstia6 = ia6;
873 return n; /* NULL if failed to set */
877 ip6_getdstifaddr(struct mbuf *m)
883 return n->ip6a_dstia6;
889 * Hop-by-Hop options header processing. If a valid jumbo payload option is
890 * included, the real payload length will be stored in plenp.
893 ip6_hopopts_input(u_int32_t *plenp,
894 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
898 struct mbuf *m = *mp;
899 int off = *offp, hbhlen;
903 /* validation of the length of the header */
904 #ifndef PULLDOWN_TEST
905 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
906 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
907 hbhlen = (hbh->ip6h_len + 1) << 3;
909 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
910 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
912 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
913 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
915 ip6stat.ip6s_tooshort++;
918 hbhlen = (hbh->ip6h_len + 1) << 3;
919 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
922 ip6stat.ip6s_tooshort++;
927 hbhlen -= sizeof(struct ip6_hbh);
928 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
930 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
931 hbhlen, rtalertp, plenp) < 0)
940 * Search header for all Hop-by-hop options and process each option.
941 * This function is separate from ip6_hopopts_input() in order to
942 * handle a case where the sending node itself process its hop-by-hop
943 * options header. In such a case, the function is called from ip6_output().
945 * The function assumes that hbh header is located right after the IPv6 header
946 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
947 * opthead + hbhlen is located in continuous memory region.
950 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
951 u_int32_t *rtalertp, u_int32_t *plenp)
955 u_int8_t *opt = opthead;
956 u_int16_t rtalert_val;
958 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
960 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
966 if (hbhlen < IP6OPT_MINLEN) {
967 ip6stat.ip6s_toosmall++;
970 optlen = *(opt + 1) + 2;
973 /* XXX may need check for alignment */
974 if (hbhlen < IP6OPT_RTALERT_LEN) {
975 ip6stat.ip6s_toosmall++;
978 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
980 icmp6_error(m, ICMP6_PARAM_PROB,
981 ICMP6_PARAMPROB_HEADER,
982 erroff + opt + 1 - opthead);
985 optlen = IP6OPT_RTALERT_LEN;
986 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
987 *rtalertp = ntohs(rtalert_val);
990 /* XXX may need check for alignment */
991 if (hbhlen < IP6OPT_JUMBO_LEN) {
992 ip6stat.ip6s_toosmall++;
995 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
997 icmp6_error(m, ICMP6_PARAM_PROB,
998 ICMP6_PARAMPROB_HEADER,
999 erroff + opt + 1 - opthead);
1002 optlen = IP6OPT_JUMBO_LEN;
1005 * IPv6 packets that have non 0 payload length
1006 * must not contain a jumbo payload option.
1008 ip6 = mtod(m, struct ip6_hdr *);
1009 if (ip6->ip6_plen) {
1010 ip6stat.ip6s_badoptions++;
1011 icmp6_error(m, ICMP6_PARAM_PROB,
1012 ICMP6_PARAMPROB_HEADER,
1013 erroff + opt - opthead);
1018 * We may see jumbolen in unaligned location, so
1019 * we'd need to perform bcopy().
1021 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1022 jumboplen = (u_int32_t)htonl(jumboplen);
1026 * if there are multiple jumbo payload options,
1027 * *plenp will be non-zero and the packet will be
1029 * the behavior may need some debate in ipngwg -
1030 * multiple options does not make sense, however,
1031 * there's no explicit mention in specification.
1034 ip6stat.ip6s_badoptions++;
1035 icmp6_error(m, ICMP6_PARAM_PROB,
1036 ICMP6_PARAMPROB_HEADER,
1037 erroff + opt + 2 - opthead);
1043 * jumbo payload length must be larger than 65535.
1045 if (jumboplen <= IPV6_MAXPACKET) {
1046 ip6stat.ip6s_badoptions++;
1047 icmp6_error(m, ICMP6_PARAM_PROB,
1048 ICMP6_PARAMPROB_HEADER,
1049 erroff + opt + 2 - opthead);
1055 default: /* unknown option */
1056 if (hbhlen < IP6OPT_MINLEN) {
1057 ip6stat.ip6s_toosmall++;
1060 optlen = ip6_unknown_opt(opt, m,
1061 erroff + opt - opthead);
1077 * Unknown option processing.
1078 * The third argument `off' is the offset from the IPv6 header to the option,
1079 * which is necessary if the IPv6 header the and option header and IPv6 header
1080 * is not continuous in order to return an ICMPv6 error.
1083 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1085 struct ip6_hdr *ip6;
1087 switch (IP6OPT_TYPE(*optp)) {
1088 case IP6OPT_TYPE_SKIP: /* ignore the option */
1089 return ((int)*(optp + 1));
1090 case IP6OPT_TYPE_DISCARD: /* silently discard */
1093 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1094 ip6stat.ip6s_badoptions++;
1095 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1097 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1098 ip6stat.ip6s_badoptions++;
1099 ip6 = mtod(m, struct ip6_hdr *);
1100 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1101 (m->m_flags & (M_BCAST|M_MCAST)))
1104 icmp6_error(m, ICMP6_PARAM_PROB,
1105 ICMP6_PARAMPROB_OPTION, off);
1109 m_freem(m); /* XXX: NOTREACHED */
1114 * Create the "control" list for this pcb.
1115 * The function will not modify mbuf chain at all.
1117 * with KAME mbuf chain restriction:
1118 * The routine will be called from upper layer handlers like tcp6_input().
1119 * Thus the routine assumes that the caller (tcp6_input) have already
1120 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1121 * very first mbuf on the mbuf chain.
1124 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1127 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1128 struct thread *td = curthread; /* XXX */
1130 int rthdr_exist = 0;
1137 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1141 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1142 SCM_TIMESTAMP, SOL_SOCKET);
1144 mp = &(*mp)->m_next;
1149 /* RFC 2292 sec. 5 */
1150 if (in6p->in6p_flags & IN6P_PKTINFO) {
1151 struct in6_pktinfo pi6;
1152 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1153 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1154 pi6.ipi6_addr.s6_addr16[1] = 0;
1155 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1156 ? m->m_pkthdr.rcvif->if_index
1158 *mp = sbcreatecontrol((caddr_t) &pi6,
1159 sizeof(struct in6_pktinfo), IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO),
1162 mp = &(*mp)->m_next;
1165 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1166 int hlim = ip6->ip6_hlim & 0xff;
1167 *mp = sbcreatecontrol((caddr_t) &hlim,
1168 sizeof(int), IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1170 mp = &(*mp)->m_next;
1173 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1177 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1180 tclass = flowinfo & 0xff;
1181 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1182 IPV6_TCLASS, IPPROTO_IPV6);
1184 mp = &(*mp)->m_next;
1188 * IPV6_HOPOPTS socket option. We require super-user privilege
1189 * for the option, but it might be too strict, since there might
1190 * be some hop-by-hop options which can be returned to normal user.
1191 * See RFC 2292 section 6.
1193 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1195 * Check if a hop-by-hop options header is contatined in the
1196 * received packet, and if so, store the options as ancillary
1197 * data. Note that a hop-by-hop options header must be
1198 * just after the IPv6 header, which fact is assured through
1199 * the IPv6 input processing.
1201 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1202 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1203 struct ip6_hbh *hbh;
1205 #ifdef PULLDOWN_TEST
1209 #ifndef PULLDOWN_TEST
1210 hbh = (struct ip6_hbh *)(ip6 + 1);
1211 hbhlen = (hbh->ip6h_len + 1) << 3;
1213 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1216 ip6stat.ip6s_tooshort++;
1219 hbh = mtod(ext, struct ip6_hbh *);
1220 hbhlen = (hbh->ip6h_len + 1) << 3;
1221 if (hbhlen != ext->m_len) {
1223 ip6stat.ip6s_tooshort++;
1229 * XXX: We copy whole the header even if a jumbo
1230 * payload option is included, which option is to
1231 * be removed before returning in the RFC 2292.
1232 * Note: this constraint is removed in 2292bis.
1234 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1235 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), IPPROTO_IPV6);
1237 mp = &(*mp)->m_next;
1238 #ifdef PULLDOWN_TEST
1244 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1245 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1246 int proto, off, nxt;
1249 * go through the header chain to see if a routing header is
1250 * contained in the packet. We need this information to store
1251 * destination options headers (if any) properly.
1252 * XXX: performance issue. We should record this info when
1253 * processing extension headers in incoming routine.
1256 proto = IPPROTO_IPV6;
1262 newoff = ip6_nexthdr(m, off, proto, &nxt);
1265 if (newoff < off) /* invalid, check for safety */
1267 if ((proto = nxt) == IPPROTO_ROUTING) {
1275 if ((in6p->in6p_flags &
1276 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1277 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1278 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1281 * Search for destination options headers or routing
1282 * header(s) through the header chain, and stores each
1283 * header as ancillary data.
1284 * Note that the order of the headers remains in
1285 * the chain of ancillary data.
1287 while (1) { /* is explicit loop prevention necessary? */
1288 struct ip6_ext *ip6e = NULL;
1290 #ifdef PULLDOWN_TEST
1291 struct mbuf *ext = NULL;
1295 * if it is not an extension header, don't try to
1296 * pull it from the chain.
1299 case IPPROTO_DSTOPTS:
1300 case IPPROTO_ROUTING:
1301 case IPPROTO_HOPOPTS:
1302 case IPPROTO_AH: /* is it possible? */
1308 #ifndef PULLDOWN_TEST
1309 if (off + sizeof(*ip6e) > m->m_len)
1311 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1312 if (nxt == IPPROTO_AH)
1313 elen = (ip6e->ip6e_len + 2) << 2;
1315 elen = (ip6e->ip6e_len + 1) << 3;
1316 if (off + elen > m->m_len)
1319 ext = ip6_pullexthdr(m, off, nxt);
1321 ip6stat.ip6s_tooshort++;
1324 ip6e = mtod(ext, struct ip6_ext *);
1325 if (nxt == IPPROTO_AH)
1326 elen = (ip6e->ip6e_len + 2) << 2;
1328 elen = (ip6e->ip6e_len + 1) << 3;
1329 if (elen != ext->m_len) {
1331 ip6stat.ip6s_tooshort++;
1337 case IPPROTO_DSTOPTS:
1338 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1342 * We also require super-user privilege for
1344 * See the comments on IN6_HOPOPTS.
1349 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1350 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1353 mp = &(*mp)->m_next;
1355 case IPPROTO_ROUTING:
1356 if (!in6p->in6p_flags & IN6P_RTHDR)
1359 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1360 IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1363 mp = &(*mp)->m_next;
1365 case IPPROTO_HOPOPTS:
1366 case IPPROTO_AH: /* is it possible? */
1371 * other cases have been filtered in the above.
1372 * none will visit this case. here we supply
1373 * the code just in case (nxt overwritten or
1376 #ifdef PULLDOWN_TEST
1383 /* proceed with the next header. */
1385 nxt = ip6e->ip6e_nxt;
1387 #ifdef PULLDOWN_TEST
1399 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1403 struct ip6_mtuinfo mtuctl;
1405 so = in6p->inp_socket;
1411 if (so == NULL) /* I believe this is impossible */
1412 panic("ip6_notify_pmtu: socket is NULL");
1415 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1416 mtuctl.ip6m_mtu = *mtu;
1417 mtuctl.ip6m_addr = *dst;
1419 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1420 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1423 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1426 /* XXX: should count statistics */
1433 #ifdef PULLDOWN_TEST
1435 * pull single extension header from mbuf chain. returns single mbuf that
1436 * contains the result, or NULL on error.
1438 static struct mbuf *
1439 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1441 struct ip6_ext ip6e;
1447 case IPPROTO_DSTOPTS:
1448 case IPPROTO_ROUTING:
1449 case IPPROTO_HOPOPTS:
1450 case IPPROTO_AH: /* is it possible? */
1453 kprintf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1457 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1458 if (nxt == IPPROTO_AH)
1459 elen = (ip6e.ip6e_len + 2) << 2;
1461 elen = (ip6e.ip6e_len + 1) << 3;
1463 n = m_getb(elen, MB_DONTWAIT, MT_DATA, 0);
1468 if (elen >= M_TRAILINGSPACE(n)) {
1473 m_copydata(m, off, elen, mtod(n, caddr_t));
1480 * Get pointer to the previous header followed by the header
1481 * currently processed.
1482 * XXX: This function supposes that
1483 * M includes all headers,
1484 * the next header field and the header length field of each header
1486 * the sum of each header length equals to OFF.
1487 * Because of these assumptions, this function must be called very
1488 * carefully. Moreover, it will not be used in the near future when
1489 * we develop `neater' mechanism to process extension headers.
1492 ip6_get_prevhdr(struct mbuf *m, int off)
1494 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1496 if (off == sizeof(struct ip6_hdr))
1497 return (&ip6->ip6_nxt);
1500 struct ip6_ext *ip6e = NULL;
1503 len = sizeof(struct ip6_hdr);
1505 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1508 case IPPROTO_FRAGMENT:
1509 len += sizeof(struct ip6_frag);
1512 len += (ip6e->ip6e_len + 2) << 2;
1515 len += (ip6e->ip6e_len + 1) << 3;
1518 nxt = ip6e->ip6e_nxt;
1521 return (&ip6e->ip6e_nxt);
1528 * get next header offset. m will be retained.
1531 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1534 struct ip6_ext ip6e;
1539 panic("ip6_nexthdr: m == NULL");
1540 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1545 if (m->m_pkthdr.len < off + sizeof(ip6))
1547 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1549 *nxtp = ip6.ip6_nxt;
1553 case IPPROTO_FRAGMENT:
1555 * terminate parsing if it is not the first fragment,
1556 * it does not make sense to parse through it.
1558 if (m->m_pkthdr.len < off + sizeof(fh))
1560 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1561 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1562 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1565 *nxtp = fh.ip6f_nxt;
1566 off += sizeof(struct ip6_frag);
1570 if (m->m_pkthdr.len < off + sizeof(ip6e))
1572 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1574 *nxtp = ip6e.ip6e_nxt;
1575 off += (ip6e.ip6e_len + 2) << 2;
1578 case IPPROTO_HOPOPTS:
1579 case IPPROTO_ROUTING:
1580 case IPPROTO_DSTOPTS:
1581 if (m->m_pkthdr.len < off + sizeof(ip6e))
1583 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1585 *nxtp = ip6e.ip6e_nxt;
1586 off += (ip6e.ip6e_len + 1) << 3;
1591 case IPPROTO_IPCOMP:
1603 * get offset for the last header in the chain. m will be kept untainted.
1606 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1616 newoff = ip6_nexthdr(m, off, proto, nxtp);
1619 else if (newoff < off)
1620 return -1; /* invalid */
1621 else if (newoff == off)
1630 ip6_addaux(struct mbuf *m)
1632 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1634 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1635 sizeof (struct ip6aux),
1638 m_tag_prepend(m, tag);
1641 bzero(m_tag_data(tag), sizeof (struct ip6aux));
1642 return tag ? (struct ip6aux *)m_tag_data(tag) : NULL;
1646 ip6_findaux(struct mbuf *m)
1648 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1649 return tag ? (struct ip6aux*)(tag+1) : NULL;
1653 ip6_delaux(struct mbuf *m)
1655 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1657 m_tag_delete(m, tag);
1661 * System control for IP6
1664 u_char inet6ctlerrmap[PRC_NCMDS] = {
1666 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1667 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1668 EMSGSIZE, EHOSTUNREACH, 0, 0,