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 1.12 2004/03/06 01:58:56 hsu Exp $ */
3 /* $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ */
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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"
73 #include "opt_pfil_hooks.h"
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/malloc.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>
85 #include <sys/kernel.h>
86 #include <sys/syslog.h>
90 #include <net/if_types.h>
91 #include <net/if_dl.h>
92 #include <net/route.h>
93 #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/in6_ifattach.h>
110 #include <netinet6/nd6.h>
111 #include <netinet6/in6_prefix.h>
114 #include <netinet6/ipsec.h>
116 #include <netinet6/ipsec6.h>
124 #endif /* FAST_IPSEC */
126 #include <net/ip6fw/ip6_fw.h>
128 #include <netinet6/ip6protosw.h>
130 /* we need it for NLOOP. */
131 #include "use_loop.h"
133 #include <net/net_osdep.h>
135 extern struct domain inet6domain;
136 extern struct ip6protosw inet6sw[];
138 u_char ip6_protox[IPPROTO_MAX];
139 struct in6_ifaddr *in6_ifaddr;
141 extern struct callout in6_tmpaddrtimer_ch;
143 int ip6_forward_srcrt; /* XXX */
144 int ip6_sourcecheck; /* XXX */
145 int ip6_sourcecheck_interval; /* XXX */
147 int ip6_ours_check_algorithm;
150 struct pfil_head inet6_pfil_hook;
154 ip6_fw_chk_t *ip6_fw_chk_ptr;
155 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
156 int ip6_fw_enable = 1;
158 struct ip6stat ip6stat;
160 static void ip6_init2 (void *);
161 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
162 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
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;
194 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
195 inet6_pfil_hook.ph_af = AF_INET6;
196 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0)
197 printf("%s: WARNING: unable to register pfil hook, "
198 "error %d\n", __func__, i);
199 #endif /* PFIL_HOOKS */
201 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;
220 * to route local address of p2p link to loopback,
221 * assign loopback address first.
223 in6_ifattach(&loif[0], NULL);
226 callout_init(&nd6_timer_ch);
227 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
229 /* router renumbering prefix list maintenance */
230 callout_init(&in6_rr_timer_ch);
231 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
233 /* timer for regeneranation of temporary addresses randomize ID */
234 callout_reset(&in6_tmpaddrtimer_ch,
235 (ip6_temp_preferred_lifetime - ip6_desync_factor -
236 ip6_temp_regen_advance) * hz,
237 in6_tmpaddrtimer, NULL);
241 /* This must be after route_init(), which is now SI_ORDER_THIRD */
242 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
244 extern struct route_in6 ip6_forward_rt;
247 ip6_input(struct netmsg *msg)
249 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
251 int off = sizeof(struct ip6_hdr), nest;
253 u_int32_t rtalert = ~0;
255 struct ifnet *deliverifp = NULL;
257 struct in6_addr odst;
263 * should the inner packet be considered authentic?
264 * see comment in ah4_input().
267 m->m_flags &= ~M_AUTHIPHDR;
268 m->m_flags &= ~M_AUTHIPDGM;
273 * make sure we don't have onion peering information into m_aux.
280 if (m->m_flags & M_EXT) {
282 ip6stat.ip6s_mext2m++;
284 ip6stat.ip6s_mext1++;
286 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
288 if (m->m_flags & M_LOOP) {
289 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
290 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
291 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
293 ip6stat.ip6s_m2m[0]++;
299 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
300 ip6stat.ip6s_total++;
302 #ifndef PULLDOWN_TEST
304 * L2 bridge code and some other code can return mbuf chain
305 * that does not conform to KAME requirement. too bad.
306 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
308 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
311 MGETHDR(n, M_DONTWAIT, MT_HEADER);
314 if (n && n->m_pkthdr.len > MHLEN) {
315 MCLGET(n, M_DONTWAIT);
316 if ((n->m_flags & M_EXT) == 0) {
326 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
327 n->m_len = n->m_pkthdr.len;
331 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
334 if (m->m_len < sizeof(struct ip6_hdr)) {
336 inifp = m->m_pkthdr.rcvif;
337 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
338 ip6stat.ip6s_toosmall++;
339 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
344 ip6 = mtod(m, struct ip6_hdr *);
346 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
347 ip6stat.ip6s_badvers++;
348 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
354 * Run through list of hooks for input packets.
356 * NB: Beware of the destination address changing
357 * (e.g. by NAT rewriting). When this happens,
358 * tell ip6_forward to do the right thing.
361 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, PFIL_IN))
363 if (m == NULL) /* consumed by filter */
365 ip6 = mtod(m, struct ip6_hdr *);
366 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
367 #endif /* PFIL_HOOKS */
369 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
372 * Check with the firewall...
374 if (ip6_fw_enable && ip6_fw_chk_ptr) {
376 /* If ipfw says divert, we have to just drop packet */
377 /* use port as a dummy argument */
378 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
387 * Check against address spoofing/corruption.
389 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
390 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
392 * XXX: "badscope" is not very suitable for a multicast source.
394 ip6stat.ip6s_badscope++;
395 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
398 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
399 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
400 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
401 ip6stat.ip6s_badscope++;
402 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
407 * The following check is not documented in specs. A malicious
408 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
409 * and bypass security checks (act as if it was from 127.0.0.1 by using
410 * IPv6 src ::ffff:127.0.0.1). Be cautious.
412 * This check chokes if we are in an SIIT cloud. As none of BSDs
413 * support IPv4-less kernel compilation, we cannot support SIIT
414 * environment at all. So, it makes more sense for us to reject any
415 * malicious packets for non-SIIT environment, than try to do a
416 * partical support for SIIT environment.
418 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
419 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
420 ip6stat.ip6s_badscope++;
421 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
426 * Reject packets with IPv4 compatible addresses (auto tunnel).
428 * The code forbids auto tunnel relay case in RFC1933 (the check is
429 * stronger than RFC1933). We may want to re-enable it if mech-xx
430 * is revised to forbid relaying case.
432 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
433 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
434 ip6stat.ip6s_badscope++;
435 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
440 /* drop packets if interface ID portion is already filled */
441 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
442 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
443 ip6->ip6_src.s6_addr16[1]) {
444 ip6stat.ip6s_badscope++;
447 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
448 ip6->ip6_dst.s6_addr16[1]) {
449 ip6stat.ip6s_badscope++;
454 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
455 ip6->ip6_src.s6_addr16[1]
456 = htons(m->m_pkthdr.rcvif->if_index);
457 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
458 ip6->ip6_dst.s6_addr16[1]
459 = htons(m->m_pkthdr.rcvif->if_index);
461 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
463 * We use rt->rt_ifp to determine if the address is ours or not.
464 * If rt_ifp is lo0, the address is ours.
465 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
466 * so any address under fe80::%lo0/64 will be mistakenly considered
467 * local. The special case is supplied to handle the case properly
468 * by actually looking at interface addresses
469 * (using in6ifa_ifpwithaddr).
471 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
472 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
473 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
474 icmp6_error(m, ICMP6_DST_UNREACH,
475 ICMP6_DST_UNREACH_ADDR, 0);
476 /* m is already freed */
481 deliverifp = m->m_pkthdr.rcvif;
489 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
490 struct in6_multi *in6m = 0;
492 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
494 * See if we belong to the destination multicast group on the
497 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
500 else if (!ip6_mrouter) {
501 ip6stat.ip6s_notmember++;
502 ip6stat.ip6s_cantforward++;
503 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
506 deliverifp = m->m_pkthdr.rcvif;
513 switch (ip6_ours_check_algorithm) {
516 * XXX: I intentionally broke our indentation rule here,
517 * since this switch-case is just for measurement and
518 * therefore should soon be removed.
520 if (ip6_forward_rt.ro_rt != NULL &&
521 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
522 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
523 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
524 ip6stat.ip6s_forward_cachehit++;
526 struct sockaddr_in6 *dst6;
528 if (ip6_forward_rt.ro_rt) {
529 /* route is down or destination is different */
530 ip6stat.ip6s_forward_cachemiss++;
531 RTFREE(ip6_forward_rt.ro_rt);
532 ip6_forward_rt.ro_rt = 0;
535 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
536 dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
537 dst6->sin6_len = sizeof(struct sockaddr_in6);
538 dst6->sin6_family = AF_INET6;
539 dst6->sin6_addr = ip6->ip6_dst;
541 ip6_forward_rt.ro_dst.sin6_scope_id =
542 in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_dst);
545 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
548 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
551 * Accept the packet if the forwarding interface to the destination
552 * according to the routing table is the loopback interface,
553 * unless the associated route has a gateway.
554 * Note that this approach causes to accept a packet if there is a
555 * route to the loopback interface for the destination of the packet.
556 * But we think it's even useful in some situations, e.g. when using
557 * a special daemon which wants to intercept the packet.
559 * XXX: some OSes automatically make a cloned route for the destination
560 * of an outgoing packet. If the outgoing interface of the packet
561 * is a loopback one, the kernel would consider the packet to be
562 * accepted, even if we have no such address assinged on the interface.
563 * We check the cloned flag of the route entry to reject such cases,
564 * assuming that route entries for our own addresses are not made by
565 * cloning (it should be true because in6_addloop explicitly installs
566 * the host route). However, we might have to do an explicit check
567 * while it would be less efficient. Or, should we rather install a
568 * reject route for such a case?
570 if (ip6_forward_rt.ro_rt &&
571 (ip6_forward_rt.ro_rt->rt_flags &
572 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
574 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
577 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
581 * The check below is redundant since the comparison of
582 * the destination and the key of the rtentry has
583 * already done through looking up the routing table.
585 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
586 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
588 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
589 struct in6_ifaddr *ia6 =
590 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
593 * record address information into m_aux.
595 (void)ip6_setdstifaddr(m, ia6);
598 * packets to a tentative, duplicated, or somehow invalid
599 * address must not be accepted.
601 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
602 /* this address is ready */
604 deliverifp = ia6->ia_ifp; /* correct? */
605 /* Count the packet in the ip address stats */
606 ia6->ia_ifa.if_ipackets++;
607 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
610 /* address is not ready, so discard the packet. */
612 "ip6_input: packet to an unready address %s->%s\n",
613 ip6_sprintf(&ip6->ip6_src),
614 ip6_sprintf(&ip6->ip6_dst)));
619 } /* XXX indentation (see above) */
622 * FAITH(Firewall Aided Internet Translator)
625 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
626 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
627 /* XXX do we need more sanity checks? */
629 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
635 * Now there is no reason to process the packet if it's not our own
636 * and we're not a router.
638 if (!ip6_forwarding) {
639 ip6stat.ip6s_cantforward++;
640 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
646 * record address information into m_aux, if we don't have one yet.
647 * note that we are unable to record it, if the address is not listed
648 * as our interface address (e.g. multicast addresses, addresses
649 * within FAITH prefixes and such).
651 if (deliverifp && !ip6_getdstifaddr(m)) {
652 struct in6_ifaddr *ia6;
654 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
656 if (!ip6_setdstifaddr(m, ia6)) {
658 * XXX maybe we should drop the packet here,
659 * as we could not provide enough information
660 * to the upper layers.
667 * Process Hop-by-Hop options header if it's contained.
668 * m may be modified in ip6_hopopts_input().
669 * If a JumboPayload option is included, plen will also be modified.
671 plen = (u_int32_t)ntohs(ip6->ip6_plen);
672 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
675 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
676 #if 0 /*touches NULL pointer*/
677 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
679 return; /* m have already been freed */
683 ip6 = mtod(m, struct ip6_hdr *);
686 * if the payload length field is 0 and the next header field
687 * indicates Hop-by-Hop Options header, then a Jumbo Payload
688 * option MUST be included.
690 if (ip6->ip6_plen == 0 && plen == 0) {
692 * Note that if a valid jumbo payload option is
693 * contained, ip6_hoptops_input() must set a valid
694 * (non-zero) payload length to the variable plen.
696 ip6stat.ip6s_badoptions++;
697 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
698 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
699 icmp6_error(m, ICMP6_PARAM_PROB,
700 ICMP6_PARAMPROB_HEADER,
701 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
704 #ifndef PULLDOWN_TEST
705 /* ip6_hopopts_input() ensures that mbuf is contiguous */
706 hbh = (struct ip6_hbh *)(ip6 + 1);
708 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
709 sizeof(struct ip6_hbh));
711 ip6stat.ip6s_tooshort++;
718 * accept the packet if a router alert option is included
719 * and we act as an IPv6 router.
721 if (rtalert != ~0 && ip6_forwarding)
727 * Check that the amount of data in the buffers
728 * is as at least much as the IPv6 header would have us expect.
729 * Trim mbufs if longer than we expect.
730 * Drop packet if shorter than we expect.
732 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
733 ip6stat.ip6s_tooshort++;
734 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
737 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
738 if (m->m_len == m->m_pkthdr.len) {
739 m->m_len = sizeof(struct ip6_hdr) + plen;
740 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
742 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
746 * Forward if desirable.
748 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
750 * If we are acting as a multicast router, all
751 * incoming multicast packets are passed to the
752 * kernel-level multicast forwarding function.
753 * The packet is returned (relatively) intact; if
754 * ip6_mforward() returns a non-zero value, the packet
755 * must be discarded, else it may be accepted below.
757 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
758 ip6stat.ip6s_cantforward++;
767 ip6_forward(m, srcrt);
771 ip6 = mtod(m, struct ip6_hdr *);
774 * Malicious party may be able to use IPv4 mapped addr to confuse
775 * tcp/udp stack and bypass security checks (act as if it was from
776 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
778 * For SIIT end node behavior, you may want to disable the check.
779 * However, you will become vulnerable to attacks using IPv4 mapped
782 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
783 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
784 ip6stat.ip6s_badscope++;
785 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
790 * Tell launch routine the next header
792 ip6stat.ip6s_delivered++;
793 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
796 while (nxt != IPPROTO_DONE) {
797 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
798 ip6stat.ip6s_toomanyhdr++;
803 * protection against faulty packet - there should be
804 * more sanity checks in header chain processing.
806 if (m->m_pkthdr.len < off) {
807 ip6stat.ip6s_tooshort++;
808 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
814 * do we need to do it for every header? yeah, other
815 * functions can play with it (like re-allocate and copy).
817 mhist = ip6_addaux(m);
818 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
819 hist = mtod(mhist, caddr_t) + mhist->m_len;
820 bcopy(&nxt, hist, sizeof(nxt));
821 mhist->m_len += sizeof(nxt);
823 ip6stat.ip6s_toomanyhdr++;
830 * enforce IPsec policy checking if we are seeing last header.
831 * note that we do not visit this with protocols with pcb layer
832 * code - like udp/tcp/raw ip.
834 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
835 ipsec6_in_reject(m, NULL)) {
836 ipsec6stat.in_polvio++;
841 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
849 * set/grab in6_ifaddr correspond to IPv6 destination address.
850 * XXX backward compatibility wrapper
852 static struct ip6aux *
853 ip6_setdstifaddr(m, ia6)
855 struct in6_ifaddr *ia6;
861 n->ip6a_dstia6 = ia6;
862 return n; /* NULL if failed to set */
873 return n->ip6a_dstia6;
879 * Hop-by-Hop options header processing. If a valid jumbo payload option is
880 * included, the real payload length will be stored in plenp.
883 ip6_hopopts_input(plenp, rtalertp, mp, offp)
885 u_int32_t *rtalertp; /* XXX: should be stored more smart way */
889 struct mbuf *m = *mp;
890 int off = *offp, hbhlen;
894 /* validation of the length of the header */
895 #ifndef PULLDOWN_TEST
896 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
897 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
898 hbhlen = (hbh->ip6h_len + 1) << 3;
900 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
901 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
903 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
904 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
906 ip6stat.ip6s_tooshort++;
909 hbhlen = (hbh->ip6h_len + 1) << 3;
910 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
913 ip6stat.ip6s_tooshort++;
918 hbhlen -= sizeof(struct ip6_hbh);
919 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
921 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
922 hbhlen, rtalertp, plenp) < 0)
931 * Search header for all Hop-by-hop options and process each option.
932 * This function is separate from ip6_hopopts_input() in order to
933 * handle a case where the sending node itself process its hop-by-hop
934 * options header. In such a case, the function is called from ip6_output().
936 * The function assumes that hbh header is located right after the IPv6 header
937 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
938 * opthead + hbhlen is located in continuous memory region.
941 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
950 u_int8_t *opt = opthead;
951 u_int16_t rtalert_val;
953 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
955 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
961 if (hbhlen < IP6OPT_MINLEN) {
962 ip6stat.ip6s_toosmall++;
965 optlen = *(opt + 1) + 2;
968 /* XXX may need check for alignment */
969 if (hbhlen < IP6OPT_RTALERT_LEN) {
970 ip6stat.ip6s_toosmall++;
973 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
975 icmp6_error(m, ICMP6_PARAM_PROB,
976 ICMP6_PARAMPROB_HEADER,
977 erroff + opt + 1 - opthead);
980 optlen = IP6OPT_RTALERT_LEN;
981 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
982 *rtalertp = ntohs(rtalert_val);
985 /* XXX may need check for alignment */
986 if (hbhlen < IP6OPT_JUMBO_LEN) {
987 ip6stat.ip6s_toosmall++;
990 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
992 icmp6_error(m, ICMP6_PARAM_PROB,
993 ICMP6_PARAMPROB_HEADER,
994 erroff + opt + 1 - opthead);
997 optlen = IP6OPT_JUMBO_LEN;
1000 * IPv6 packets that have non 0 payload length
1001 * must not contain a jumbo payload option.
1003 ip6 = mtod(m, struct ip6_hdr *);
1004 if (ip6->ip6_plen) {
1005 ip6stat.ip6s_badoptions++;
1006 icmp6_error(m, ICMP6_PARAM_PROB,
1007 ICMP6_PARAMPROB_HEADER,
1008 erroff + opt - opthead);
1013 * We may see jumbolen in unaligned location, so
1014 * we'd need to perform bcopy().
1016 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1017 jumboplen = (u_int32_t)htonl(jumboplen);
1021 * if there are multiple jumbo payload options,
1022 * *plenp will be non-zero and the packet will be
1024 * the behavior may need some debate in ipngwg -
1025 * multiple options does not make sense, however,
1026 * there's no explicit mention in specification.
1029 ip6stat.ip6s_badoptions++;
1030 icmp6_error(m, ICMP6_PARAM_PROB,
1031 ICMP6_PARAMPROB_HEADER,
1032 erroff + opt + 2 - opthead);
1038 * jumbo payload length must be larger than 65535.
1040 if (jumboplen <= IPV6_MAXPACKET) {
1041 ip6stat.ip6s_badoptions++;
1042 icmp6_error(m, ICMP6_PARAM_PROB,
1043 ICMP6_PARAMPROB_HEADER,
1044 erroff + opt + 2 - opthead);
1050 default: /* unknown option */
1051 if (hbhlen < IP6OPT_MINLEN) {
1052 ip6stat.ip6s_toosmall++;
1055 optlen = ip6_unknown_opt(opt, m,
1056 erroff + opt - opthead);
1072 * Unknown option processing.
1073 * The third argument `off' is the offset from the IPv6 header to the option,
1074 * which is necessary if the IPv6 header the and option header and IPv6 header
1075 * is not continuous in order to return an ICMPv6 error.
1078 ip6_unknown_opt(optp, m, off)
1083 struct ip6_hdr *ip6;
1085 switch (IP6OPT_TYPE(*optp)) {
1086 case IP6OPT_TYPE_SKIP: /* ignore the option */
1087 return((int)*(optp + 1));
1088 case IP6OPT_TYPE_DISCARD: /* silently discard */
1091 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1092 ip6stat.ip6s_badoptions++;
1093 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1095 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1096 ip6stat.ip6s_badoptions++;
1097 ip6 = mtod(m, struct ip6_hdr *);
1098 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1099 (m->m_flags & (M_BCAST|M_MCAST)))
1102 icmp6_error(m, ICMP6_PARAM_PROB,
1103 ICMP6_PARAMPROB_OPTION, off);
1107 m_freem(m); /* XXX: NOTREACHED */
1112 * Create the "control" list for this pcb.
1113 * The function will not modify mbuf chain at all.
1115 * with KAME mbuf chain restriction:
1116 * The routine will be called from upper layer handlers like tcp6_input().
1117 * Thus the routine assumes that the caller (tcp6_input) have already
1118 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1119 * very first mbuf on the mbuf chain.
1122 ip6_savecontrol(in6p, mp, ip6, m)
1125 struct ip6_hdr *ip6;
1128 struct thread *td = curthread; /* XXX */
1130 int rthdr_exist = 0;
1137 if ((in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0) {
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) != 0) {
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), IPV6_PKTINFO,
1162 mp = &(*mp)->m_next;
1165 if ((in6p->in6p_flags & IN6P_HOPLIMIT) != 0) {
1166 int hlim = ip6->ip6_hlim & 0xff;
1167 *mp = sbcreatecontrol((caddr_t) &hlim,
1168 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1170 mp = &(*mp)->m_next;
1174 * IPV6_HOPOPTS socket option. We require super-user privilege
1175 * for the option, but it might be too strict, since there might
1176 * be some hop-by-hop options which can be returned to normal user.
1177 * See RFC 2292 section 6.
1179 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1181 * Check if a hop-by-hop options header is contatined in the
1182 * received packet, and if so, store the options as ancillary
1183 * data. Note that a hop-by-hop options header must be
1184 * just after the IPv6 header, which fact is assured through
1185 * the IPv6 input processing.
1187 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1188 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1189 struct ip6_hbh *hbh;
1191 #ifdef PULLDOWN_TEST
1195 #ifndef PULLDOWN_TEST
1196 hbh = (struct ip6_hbh *)(ip6 + 1);
1197 hbhlen = (hbh->ip6h_len + 1) << 3;
1199 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1202 ip6stat.ip6s_tooshort++;
1205 hbh = mtod(ext, struct ip6_hbh *);
1206 hbhlen = (hbh->ip6h_len + 1) << 3;
1207 if (hbhlen != ext->m_len) {
1209 ip6stat.ip6s_tooshort++;
1215 * XXX: We copy whole the header even if a jumbo
1216 * payload option is included, which option is to
1217 * be removed before returning in the RFC 2292.
1218 * Note: this constraint is removed in 2292bis.
1220 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1221 IPV6_HOPOPTS, IPPROTO_IPV6);
1223 mp = &(*mp)->m_next;
1224 #ifdef PULLDOWN_TEST
1230 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1231 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1232 int proto, off, nxt;
1235 * go through the header chain to see if a routing header is
1236 * contained in the packet. We need this information to store
1237 * destination options headers (if any) properly.
1238 * XXX: performance issue. We should record this info when
1239 * processing extension headers in incoming routine.
1242 proto = IPPROTO_IPV6;
1248 newoff = ip6_nexthdr(m, off, proto, &nxt);
1251 if (newoff < off) /* invalid, check for safety */
1253 if ((proto = nxt) == IPPROTO_ROUTING) {
1261 if ((in6p->in6p_flags &
1262 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1263 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1264 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1267 * Search for destination options headers or routing
1268 * header(s) through the header chain, and stores each
1269 * header as ancillary data.
1270 * Note that the order of the headers remains in
1271 * the chain of ancillary data.
1273 while (1) { /* is explicit loop prevention necessary? */
1274 struct ip6_ext *ip6e = NULL;
1276 #ifdef PULLDOWN_TEST
1277 struct mbuf *ext = NULL;
1281 * if it is not an extension header, don't try to
1282 * pull it from the chain.
1285 case IPPROTO_DSTOPTS:
1286 case IPPROTO_ROUTING:
1287 case IPPROTO_HOPOPTS:
1288 case IPPROTO_AH: /* is it possible? */
1294 #ifndef PULLDOWN_TEST
1295 if (off + sizeof(*ip6e) > m->m_len)
1297 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1298 if (nxt == IPPROTO_AH)
1299 elen = (ip6e->ip6e_len + 2) << 2;
1301 elen = (ip6e->ip6e_len + 1) << 3;
1302 if (off + elen > m->m_len)
1305 ext = ip6_pullexthdr(m, off, nxt);
1307 ip6stat.ip6s_tooshort++;
1310 ip6e = mtod(ext, struct ip6_ext *);
1311 if (nxt == IPPROTO_AH)
1312 elen = (ip6e->ip6e_len + 2) << 2;
1314 elen = (ip6e->ip6e_len + 1) << 3;
1315 if (elen != ext->m_len) {
1317 ip6stat.ip6s_tooshort++;
1323 case IPPROTO_DSTOPTS:
1324 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1328 * We also require super-user privilege for
1330 * See the comments on IN6_HOPOPTS.
1335 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1339 mp = &(*mp)->m_next;
1341 case IPPROTO_ROUTING:
1342 if (!in6p->in6p_flags & IN6P_RTHDR)
1345 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1349 mp = &(*mp)->m_next;
1351 case IPPROTO_HOPOPTS:
1352 case IPPROTO_AH: /* is it possible? */
1357 * other cases have been filtered in the above.
1358 * none will visit this case. here we supply
1359 * the code just in case (nxt overwritten or
1362 #ifdef PULLDOWN_TEST
1369 /* proceed with the next header. */
1371 nxt = ip6e->ip6e_nxt;
1373 #ifdef PULLDOWN_TEST
1384 #ifdef PULLDOWN_TEST
1386 * pull single extension header from mbuf chain. returns single mbuf that
1387 * contains the result, or NULL on error.
1389 static struct mbuf *
1390 ip6_pullexthdr(m, off, nxt)
1395 struct ip6_ext ip6e;
1401 case IPPROTO_DSTOPTS:
1402 case IPPROTO_ROUTING:
1403 case IPPROTO_HOPOPTS:
1404 case IPPROTO_AH: /* is it possible? */
1407 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1411 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1412 if (nxt == IPPROTO_AH)
1413 elen = (ip6e.ip6e_len + 2) << 2;
1415 elen = (ip6e.ip6e_len + 1) << 3;
1417 MGET(n, M_DONTWAIT, MT_DATA);
1418 if (n && elen >= MLEN) {
1419 MCLGET(n, M_DONTWAIT);
1420 if ((n->m_flags & M_EXT) == 0) {
1429 if (elen >= M_TRAILINGSPACE(n)) {
1434 m_copydata(m, off, elen, mtod(n, caddr_t));
1441 * Get pointer to the previous header followed by the header
1442 * currently processed.
1443 * XXX: This function supposes that
1444 * M includes all headers,
1445 * the next header field and the header length field of each header
1447 * the sum of each header length equals to OFF.
1448 * Because of these assumptions, this function must be called very
1449 * carefully. Moreover, it will not be used in the near future when
1450 * we develop `neater' mechanism to process extension headers.
1453 ip6_get_prevhdr(m, off)
1457 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1459 if (off == sizeof(struct ip6_hdr))
1460 return(&ip6->ip6_nxt);
1463 struct ip6_ext *ip6e = NULL;
1466 len = sizeof(struct ip6_hdr);
1468 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1471 case IPPROTO_FRAGMENT:
1472 len += sizeof(struct ip6_frag);
1475 len += (ip6e->ip6e_len + 2) << 2;
1478 len += (ip6e->ip6e_len + 1) << 3;
1481 nxt = ip6e->ip6e_nxt;
1484 return(&ip6e->ip6e_nxt);
1491 * get next header offset. m will be retained.
1494 ip6_nexthdr(m, off, proto, nxtp)
1501 struct ip6_ext ip6e;
1506 panic("ip6_nexthdr: m == NULL");
1507 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1512 if (m->m_pkthdr.len < off + sizeof(ip6))
1514 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1516 *nxtp = ip6.ip6_nxt;
1520 case IPPROTO_FRAGMENT:
1522 * terminate parsing if it is not the first fragment,
1523 * it does not make sense to parse through it.
1525 if (m->m_pkthdr.len < off + sizeof(fh))
1527 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1528 if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1531 *nxtp = fh.ip6f_nxt;
1532 off += sizeof(struct ip6_frag);
1536 if (m->m_pkthdr.len < off + sizeof(ip6e))
1538 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1540 *nxtp = ip6e.ip6e_nxt;
1541 off += (ip6e.ip6e_len + 2) << 2;
1544 case IPPROTO_HOPOPTS:
1545 case IPPROTO_ROUTING:
1546 case IPPROTO_DSTOPTS:
1547 if (m->m_pkthdr.len < off + sizeof(ip6e))
1549 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1551 *nxtp = ip6e.ip6e_nxt;
1552 off += (ip6e.ip6e_len + 1) << 3;
1557 case IPPROTO_IPCOMP:
1569 * get offset for the last header in the chain. m will be kept untainted.
1572 ip6_lasthdr(m, off, proto, nxtp)
1586 newoff = ip6_nexthdr(m, off, proto, nxtp);
1589 else if (newoff < off)
1590 return -1; /* invalid */
1591 else if (newoff == off)
1603 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1605 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1606 sizeof (struct ip6aux),
1609 m_tag_prepend(m, tag);
1612 bzero(tag+1, sizeof (struct ip6aux));
1613 return tag ? (struct ip6aux*)(tag+1) : NULL;
1620 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1621 return tag ? (struct ip6aux*)(tag+1) : NULL;
1628 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1630 m_tag_delete(m, tag);
1634 * System control for IP6
1637 u_char inet6ctlerrmap[PRC_NCMDS] = {
1639 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1640 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1641 EMSGSIZE, EHOSTUNREACH, 0, 0,