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 1.18 2004/06/02 14:43:01 eirikn 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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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>
89 #include <sys/thread2.h>
90 #include <sys/msgport2.h>
93 #include <net/if_types.h>
94 #include <net/if_dl.h>
95 #include <net/route.h>
96 #include <net/netisr.h>
101 #include <netinet/in.h>
102 #include <netinet/in_systm.h>
104 #include <netinet/ip.h>
105 #include <netinet/ip_icmp.h>
107 #include <netinet/ip6.h>
108 #include <netinet6/in6_var.h>
109 #include <netinet6/ip6_var.h>
110 #include <netinet/in_pcb.h>
111 #include <netinet/icmp6.h>
112 #include <netinet6/in6_ifattach.h>
113 #include <netinet6/nd6.h>
114 #include <netinet6/in6_prefix.h>
117 #include <netinet6/ipsec.h>
119 #include <netinet6/ipsec6.h>
127 #endif /* FAST_IPSEC */
129 #include <net/ip6fw/ip6_fw.h>
131 #include <netinet6/ip6protosw.h>
133 /* we need it for NLOOP. */
134 #include "use_loop.h"
136 #include <net/net_osdep.h>
138 extern struct domain inet6domain;
139 extern struct ip6protosw inet6sw[];
141 u_char ip6_protox[IPPROTO_MAX];
142 struct in6_ifaddr *in6_ifaddr;
144 extern struct callout in6_tmpaddrtimer_ch;
146 int ip6_forward_srcrt; /* XXX */
147 int ip6_sourcecheck; /* XXX */
148 int ip6_sourcecheck_interval; /* XXX */
150 int ip6_ours_check_algorithm;
153 struct pfil_head inet6_pfil_hook;
157 ip6_fw_chk_t *ip6_fw_chk_ptr;
158 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
159 int ip6_fw_enable = 1;
161 struct ip6stat ip6stat;
163 static void ip6_init2 (void *);
164 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
165 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
166 static int ip6_input(struct netmsg *msg);
168 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
172 * IP6 initialization: fill in IP6 protocol switch table.
173 * All protocols not implemented in kernel go to raw IP6 protocol handler.
178 struct ip6protosw *pr;
183 if (sizeof(struct protosw) != sizeof(struct ip6protosw))
184 panic("sizeof(protosw) != sizeof(ip6protosw)");
186 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
189 for (i = 0; i < IPPROTO_MAX; i++)
190 ip6_protox[i] = pr - inet6sw;
191 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
192 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
193 if (pr->pr_domain->dom_family == PF_INET6 &&
194 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
195 ip6_protox[pr->pr_protocol] = pr - inet6sw;
198 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
199 inet6_pfil_hook.ph_af = AF_INET6;
200 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0)
201 printf("%s: WARNING: unable to register pfil hook, "
202 "error %d\n", __func__, i);
203 #endif /* PFIL_HOOKS */
205 netisr_register(NETISR_IPV6, cpu0_portfn, ip6_input);
209 * in many cases, random() here does NOT return random number
210 * as initialization during bootstrap time occur in fixed order.
213 ip6_flow_seq = random() ^ tv.tv_usec;
215 ip6_desync_factor = (random() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
219 ip6_init2(void *dummy)
223 * to route local address of p2p link to loopback,
224 * assign loopback address first.
226 in6_ifattach(&loif[0], NULL);
229 callout_init(&nd6_timer_ch);
230 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
232 /* router renumbering prefix list maintenance */
233 callout_init(&in6_rr_timer_ch);
234 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
236 /* timer for regeneranation of temporary addresses randomize ID */
237 callout_reset(&in6_tmpaddrtimer_ch,
238 (ip6_temp_preferred_lifetime - ip6_desync_factor -
239 ip6_temp_regen_advance) * hz,
240 in6_tmpaddrtimer, NULL);
244 /* This must be after route_init(), which is now SI_ORDER_THIRD */
245 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
247 extern struct route_in6 ip6_forward_rt;
251 ip6_input(struct netmsg *msg)
253 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
255 int off = sizeof(struct ip6_hdr), nest;
257 u_int32_t rtalert = ~0;
259 struct ifnet *deliverifp = NULL;
261 struct in6_addr odst;
267 * should the inner packet be considered authentic?
268 * see comment in ah4_input().
271 m->m_flags &= ~M_AUTHIPHDR;
272 m->m_flags &= ~M_AUTHIPDGM;
277 * make sure we don't have onion peering information into m_aux.
284 if (m->m_flags & M_EXT) {
286 ip6stat.ip6s_mext2m++;
288 ip6stat.ip6s_mext1++;
290 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
292 if (m->m_flags & M_LOOP) {
293 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
294 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
295 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
297 ip6stat.ip6s_m2m[0]++;
303 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
304 ip6stat.ip6s_total++;
306 #ifndef PULLDOWN_TEST
308 * L2 bridge code and some other code can return mbuf chain
309 * that does not conform to KAME requirement. too bad.
310 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
312 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
315 MGETHDR(n, MB_DONTWAIT, MT_HEADER);
318 if (n && n->m_pkthdr.len > MHLEN) {
319 MCLGET(n, MB_DONTWAIT);
320 if ((n->m_flags & M_EXT) == 0) {
328 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
329 n->m_len = n->m_pkthdr.len;
333 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), EASYNC);
336 if (m->m_len < sizeof(struct ip6_hdr)) {
338 inifp = m->m_pkthdr.rcvif;
339 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
340 ip6stat.ip6s_toosmall++;
341 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
346 ip6 = mtod(m, struct ip6_hdr *);
348 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
349 ip6stat.ip6s_badvers++;
350 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
356 * Run through list of hooks for input packets.
358 * NB: Beware of the destination address changing
359 * (e.g. by NAT rewriting). When this happens,
360 * tell ip6_forward to do the right thing.
362 if (pfil_has_hooks(&inet6_pfil_hook)) {
364 if (pfil_run_hooks(&inet6_pfil_hook, &m,
365 m->m_pkthdr.rcvif, PFIL_IN)) {
368 if (m == NULL) /* consumed by filter */
370 ip6 = mtod(m, struct ip6_hdr *);
371 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
373 #endif /* PFIL_HOOKS */
375 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
378 * Check with the firewall...
380 if (ip6_fw_enable && ip6_fw_chk_ptr) {
382 /* If ipfw says divert, we have to just drop packet */
383 /* use port as a dummy argument */
384 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
393 * Check against address spoofing/corruption.
395 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
396 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
398 * XXX: "badscope" is not very suitable for a multicast source.
400 ip6stat.ip6s_badscope++;
401 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
404 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
405 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
406 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
407 ip6stat.ip6s_badscope++;
408 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
413 * The following check is not documented in specs. A malicious
414 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
415 * and bypass security checks (act as if it was from 127.0.0.1 by using
416 * IPv6 src ::ffff:127.0.0.1). Be cautious.
418 * This check chokes if we are in an SIIT cloud. As none of BSDs
419 * support IPv4-less kernel compilation, we cannot support SIIT
420 * environment at all. So, it makes more sense for us to reject any
421 * malicious packets for non-SIIT environment, than try to do a
422 * partical support for SIIT environment.
424 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
425 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
426 ip6stat.ip6s_badscope++;
427 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
432 * Reject packets with IPv4 compatible addresses (auto tunnel).
434 * The code forbids auto tunnel relay case in RFC1933 (the check is
435 * stronger than RFC1933). We may want to re-enable it if mech-xx
436 * is revised to forbid relaying case.
438 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
439 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
440 ip6stat.ip6s_badscope++;
441 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
446 /* drop packets if interface ID portion is already filled */
447 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
448 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
449 ip6->ip6_src.s6_addr16[1]) {
450 ip6stat.ip6s_badscope++;
453 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
454 ip6->ip6_dst.s6_addr16[1]) {
455 ip6stat.ip6s_badscope++;
460 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
461 ip6->ip6_src.s6_addr16[1]
462 = htons(m->m_pkthdr.rcvif->if_index);
463 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
464 ip6->ip6_dst.s6_addr16[1]
465 = htons(m->m_pkthdr.rcvif->if_index);
467 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
469 * We use rt->rt_ifp to determine if the address is ours or not.
470 * If rt_ifp is lo0, the address is ours.
471 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
472 * so any address under fe80::%lo0/64 will be mistakenly considered
473 * local. The special case is supplied to handle the case properly
474 * by actually looking at interface addresses
475 * (using in6ifa_ifpwithaddr).
477 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
478 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
479 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
480 icmp6_error(m, ICMP6_DST_UNREACH,
481 ICMP6_DST_UNREACH_ADDR, 0);
482 /* m is already freed */
487 deliverifp = m->m_pkthdr.rcvif;
495 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
496 struct in6_multi *in6m = 0;
498 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
500 * See if we belong to the destination multicast group on the
503 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
506 else if (!ip6_mrouter) {
507 ip6stat.ip6s_notmember++;
508 ip6stat.ip6s_cantforward++;
509 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
512 deliverifp = m->m_pkthdr.rcvif;
519 switch (ip6_ours_check_algorithm) {
522 * XXX: I intentionally broke our indentation rule here,
523 * since this switch-case is just for measurement and
524 * therefore should soon be removed.
526 if (ip6_forward_rt.ro_rt != NULL &&
527 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
528 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
529 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
530 ip6stat.ip6s_forward_cachehit++;
532 struct sockaddr_in6 *dst6;
534 if (ip6_forward_rt.ro_rt) {
535 /* route is down or destination is different */
536 ip6stat.ip6s_forward_cachemiss++;
537 RTFREE(ip6_forward_rt.ro_rt);
538 ip6_forward_rt.ro_rt = 0;
541 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
542 dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
543 dst6->sin6_len = sizeof(struct sockaddr_in6);
544 dst6->sin6_family = AF_INET6;
545 dst6->sin6_addr = ip6->ip6_dst;
547 ip6_forward_rt.ro_dst.sin6_scope_id =
548 in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_dst);
551 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
554 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
557 * Accept the packet if the forwarding interface to the destination
558 * according to the routing table is the loopback interface,
559 * unless the associated route has a gateway.
560 * Note that this approach causes to accept a packet if there is a
561 * route to the loopback interface for the destination of the packet.
562 * But we think it's even useful in some situations, e.g. when using
563 * a special daemon which wants to intercept the packet.
565 * XXX: some OSes automatically make a cloned route for the destination
566 * of an outgoing packet. If the outgoing interface of the packet
567 * is a loopback one, the kernel would consider the packet to be
568 * accepted, even if we have no such address assinged on the interface.
569 * We check the cloned flag of the route entry to reject such cases,
570 * assuming that route entries for our own addresses are not made by
571 * cloning (it should be true because in6_addloop explicitly installs
572 * the host route). However, we might have to do an explicit check
573 * while it would be less efficient. Or, should we rather install a
574 * reject route for such a case?
576 if (ip6_forward_rt.ro_rt &&
577 (ip6_forward_rt.ro_rt->rt_flags &
578 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
580 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
583 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
587 * The check below is redundant since the comparison of
588 * the destination and the key of the rtentry has
589 * already done through looking up the routing table.
591 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
592 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
594 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
595 struct in6_ifaddr *ia6 =
596 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
599 * record address information into m_aux.
601 (void)ip6_setdstifaddr(m, ia6);
604 * packets to a tentative, duplicated, or somehow invalid
605 * address must not be accepted.
607 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
608 /* this address is ready */
610 deliverifp = ia6->ia_ifp; /* correct? */
611 /* Count the packet in the ip address stats */
612 ia6->ia_ifa.if_ipackets++;
613 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
616 /* address is not ready, so discard the packet. */
618 "ip6_input: packet to an unready address %s->%s\n",
619 ip6_sprintf(&ip6->ip6_src),
620 ip6_sprintf(&ip6->ip6_dst)));
625 } /* XXX indentation (see above) */
628 * FAITH(Firewall Aided Internet Translator)
631 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
632 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
633 /* XXX do we need more sanity checks? */
635 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
641 * Now there is no reason to process the packet if it's not our own
642 * and we're not a router.
644 if (!ip6_forwarding) {
645 ip6stat.ip6s_cantforward++;
646 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
652 * record address information into m_aux, if we don't have one yet.
653 * note that we are unable to record it, if the address is not listed
654 * as our interface address (e.g. multicast addresses, addresses
655 * within FAITH prefixes and such).
657 if (deliverifp && !ip6_getdstifaddr(m)) {
658 struct in6_ifaddr *ia6;
660 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
662 if (!ip6_setdstifaddr(m, ia6)) {
664 * XXX maybe we should drop the packet here,
665 * as we could not provide enough information
666 * to the upper layers.
673 * Process Hop-by-Hop options header if it's contained.
674 * m may be modified in ip6_hopopts_input().
675 * If a JumboPayload option is included, plen will also be modified.
677 plen = (u_int32_t)ntohs(ip6->ip6_plen);
678 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
681 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
682 #if 0 /*touches NULL pointer*/
683 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
685 goto bad2; /* m have already been freed */
689 ip6 = mtod(m, struct ip6_hdr *);
692 * if the payload length field is 0 and the next header field
693 * indicates Hop-by-Hop Options header, then a Jumbo Payload
694 * option MUST be included.
696 if (ip6->ip6_plen == 0 && plen == 0) {
698 * Note that if a valid jumbo payload option is
699 * contained, ip6_hoptops_input() must set a valid
700 * (non-zero) payload length to the variable plen.
702 ip6stat.ip6s_badoptions++;
703 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
704 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
705 icmp6_error(m, ICMP6_PARAM_PROB,
706 ICMP6_PARAMPROB_HEADER,
707 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
710 #ifndef PULLDOWN_TEST
711 /* ip6_hopopts_input() ensures that mbuf is contiguous */
712 hbh = (struct ip6_hbh *)(ip6 + 1);
714 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
715 sizeof(struct ip6_hbh));
717 ip6stat.ip6s_tooshort++;
724 * accept the packet if a router alert option is included
725 * and we act as an IPv6 router.
727 if (rtalert != ~0 && ip6_forwarding)
733 * Check that the amount of data in the buffers
734 * is as at least much as the IPv6 header would have us expect.
735 * Trim mbufs if longer than we expect.
736 * Drop packet if shorter than we expect.
738 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
739 ip6stat.ip6s_tooshort++;
740 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
743 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
744 if (m->m_len == m->m_pkthdr.len) {
745 m->m_len = sizeof(struct ip6_hdr) + plen;
746 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
748 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
752 * Forward if desirable.
754 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
756 * If we are acting as a multicast router, all
757 * incoming multicast packets are passed to the
758 * kernel-level multicast forwarding function.
759 * The packet is returned (relatively) intact; if
760 * ip6_mforward() returns a non-zero value, the packet
761 * must be discarded, else it may be accepted below.
763 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
764 ip6stat.ip6s_cantforward++;
770 ip6_forward(m, srcrt);
774 ip6 = mtod(m, struct ip6_hdr *);
777 * Malicious party may be able to use IPv4 mapped addr to confuse
778 * tcp/udp stack and bypass security checks (act as if it was from
779 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
781 * For SIIT end node behavior, you may want to disable the check.
782 * However, you will become vulnerable to attacks using IPv4 mapped
785 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
786 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
787 ip6stat.ip6s_badscope++;
788 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
793 * Tell launch routine the next header
795 ip6stat.ip6s_delivered++;
796 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
799 while (nxt != IPPROTO_DONE) {
800 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
801 ip6stat.ip6s_toomanyhdr++;
806 * protection against faulty packet - there should be
807 * more sanity checks in header chain processing.
809 if (m->m_pkthdr.len < off) {
810 ip6stat.ip6s_tooshort++;
811 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
817 * do we need to do it for every header? yeah, other
818 * functions can play with it (like re-allocate and copy).
820 mhist = ip6_addaux(m);
821 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
822 hist = mtod(mhist, caddr_t) + mhist->m_len;
823 bcopy(&nxt, hist, sizeof(nxt));
824 mhist->m_len += sizeof(nxt);
826 ip6stat.ip6s_toomanyhdr++;
833 * enforce IPsec policy checking if we are seeing last header.
834 * note that we do not visit this with protocols with pcb layer
835 * code - like udp/tcp/raw ip.
837 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
838 ipsec6_in_reject(m, NULL)) {
839 ipsec6stat.in_polvio++;
844 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
850 lwkt_replymsg(&msg->nm_lmsg, 0);
855 * set/grab in6_ifaddr correspond to IPv6 destination address.
856 * XXX backward compatibility wrapper
858 static struct ip6aux *
859 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
865 n->ip6a_dstia6 = ia6;
866 return n; /* NULL if failed to set */
870 ip6_getdstifaddr(struct mbuf *m)
876 return n->ip6a_dstia6;
882 * Hop-by-Hop options header processing. If a valid jumbo payload option is
883 * included, the real payload length will be stored in plenp.
886 ip6_hopopts_input(u_int32_t *plenp,
887 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
891 struct mbuf *m = *mp;
892 int off = *offp, hbhlen;
896 /* validation of the length of the header */
897 #ifndef PULLDOWN_TEST
898 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
899 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
900 hbhlen = (hbh->ip6h_len + 1) << 3;
902 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
903 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
905 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
906 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
908 ip6stat.ip6s_tooshort++;
911 hbhlen = (hbh->ip6h_len + 1) << 3;
912 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
915 ip6stat.ip6s_tooshort++;
920 hbhlen -= sizeof(struct ip6_hbh);
921 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
923 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
924 hbhlen, rtalertp, plenp) < 0)
933 * Search header for all Hop-by-hop options and process each option.
934 * This function is separate from ip6_hopopts_input() in order to
935 * handle a case where the sending node itself process its hop-by-hop
936 * options header. In such a case, the function is called from ip6_output().
938 * The function assumes that hbh header is located right after the IPv6 header
939 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
940 * opthead + hbhlen is located in continuous memory region.
943 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
944 u_int32_t *rtalertp, u_int32_t *plenp)
948 u_int8_t *opt = opthead;
949 u_int16_t rtalert_val;
951 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
953 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
959 if (hbhlen < IP6OPT_MINLEN) {
960 ip6stat.ip6s_toosmall++;
963 optlen = *(opt + 1) + 2;
966 /* XXX may need check for alignment */
967 if (hbhlen < IP6OPT_RTALERT_LEN) {
968 ip6stat.ip6s_toosmall++;
971 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
973 icmp6_error(m, ICMP6_PARAM_PROB,
974 ICMP6_PARAMPROB_HEADER,
975 erroff + opt + 1 - opthead);
978 optlen = IP6OPT_RTALERT_LEN;
979 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
980 *rtalertp = ntohs(rtalert_val);
983 /* XXX may need check for alignment */
984 if (hbhlen < IP6OPT_JUMBO_LEN) {
985 ip6stat.ip6s_toosmall++;
988 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
990 icmp6_error(m, ICMP6_PARAM_PROB,
991 ICMP6_PARAMPROB_HEADER,
992 erroff + opt + 1 - opthead);
995 optlen = IP6OPT_JUMBO_LEN;
998 * IPv6 packets that have non 0 payload length
999 * must not contain a jumbo payload option.
1001 ip6 = mtod(m, struct ip6_hdr *);
1002 if (ip6->ip6_plen) {
1003 ip6stat.ip6s_badoptions++;
1004 icmp6_error(m, ICMP6_PARAM_PROB,
1005 ICMP6_PARAMPROB_HEADER,
1006 erroff + opt - opthead);
1011 * We may see jumbolen in unaligned location, so
1012 * we'd need to perform bcopy().
1014 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1015 jumboplen = (u_int32_t)htonl(jumboplen);
1019 * if there are multiple jumbo payload options,
1020 * *plenp will be non-zero and the packet will be
1022 * the behavior may need some debate in ipngwg -
1023 * multiple options does not make sense, however,
1024 * there's no explicit mention in specification.
1027 ip6stat.ip6s_badoptions++;
1028 icmp6_error(m, ICMP6_PARAM_PROB,
1029 ICMP6_PARAMPROB_HEADER,
1030 erroff + opt + 2 - opthead);
1036 * jumbo payload length must be larger than 65535.
1038 if (jumboplen <= IPV6_MAXPACKET) {
1039 ip6stat.ip6s_badoptions++;
1040 icmp6_error(m, ICMP6_PARAM_PROB,
1041 ICMP6_PARAMPROB_HEADER,
1042 erroff + opt + 2 - opthead);
1048 default: /* unknown option */
1049 if (hbhlen < IP6OPT_MINLEN) {
1050 ip6stat.ip6s_toosmall++;
1053 optlen = ip6_unknown_opt(opt, m,
1054 erroff + opt - opthead);
1070 * Unknown option processing.
1071 * The third argument `off' is the offset from the IPv6 header to the option,
1072 * which is necessary if the IPv6 header the and option header and IPv6 header
1073 * is not continuous in order to return an ICMPv6 error.
1076 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1078 struct ip6_hdr *ip6;
1080 switch (IP6OPT_TYPE(*optp)) {
1081 case IP6OPT_TYPE_SKIP: /* ignore the option */
1082 return((int)*(optp + 1));
1083 case IP6OPT_TYPE_DISCARD: /* silently discard */
1086 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1087 ip6stat.ip6s_badoptions++;
1088 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1090 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1091 ip6stat.ip6s_badoptions++;
1092 ip6 = mtod(m, struct ip6_hdr *);
1093 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1094 (m->m_flags & (M_BCAST|M_MCAST)))
1097 icmp6_error(m, ICMP6_PARAM_PROB,
1098 ICMP6_PARAMPROB_OPTION, off);
1102 m_freem(m); /* XXX: NOTREACHED */
1107 * Create the "control" list for this pcb.
1108 * The function will not modify mbuf chain at all.
1110 * with KAME mbuf chain restriction:
1111 * The routine will be called from upper layer handlers like tcp6_input().
1112 * Thus the routine assumes that the caller (tcp6_input) have already
1113 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1114 * very first mbuf on the mbuf chain.
1117 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1120 struct thread *td = curthread; /* XXX */
1122 int rthdr_exist = 0;
1129 if ((in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0) {
1133 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1134 SCM_TIMESTAMP, SOL_SOCKET);
1136 mp = &(*mp)->m_next;
1141 /* RFC 2292 sec. 5 */
1142 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1143 struct in6_pktinfo pi6;
1144 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1145 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1146 pi6.ipi6_addr.s6_addr16[1] = 0;
1147 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1148 ? m->m_pkthdr.rcvif->if_index
1150 *mp = sbcreatecontrol((caddr_t) &pi6,
1151 sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1154 mp = &(*mp)->m_next;
1157 if ((in6p->in6p_flags & IN6P_HOPLIMIT) != 0) {
1158 int hlim = ip6->ip6_hlim & 0xff;
1159 *mp = sbcreatecontrol((caddr_t) &hlim,
1160 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1162 mp = &(*mp)->m_next;
1166 * IPV6_HOPOPTS socket option. We require super-user privilege
1167 * for the option, but it might be too strict, since there might
1168 * be some hop-by-hop options which can be returned to normal user.
1169 * See RFC 2292 section 6.
1171 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1173 * Check if a hop-by-hop options header is contatined in the
1174 * received packet, and if so, store the options as ancillary
1175 * data. Note that a hop-by-hop options header must be
1176 * just after the IPv6 header, which fact is assured through
1177 * the IPv6 input processing.
1179 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1180 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1181 struct ip6_hbh *hbh;
1183 #ifdef PULLDOWN_TEST
1187 #ifndef PULLDOWN_TEST
1188 hbh = (struct ip6_hbh *)(ip6 + 1);
1189 hbhlen = (hbh->ip6h_len + 1) << 3;
1191 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1194 ip6stat.ip6s_tooshort++;
1197 hbh = mtod(ext, struct ip6_hbh *);
1198 hbhlen = (hbh->ip6h_len + 1) << 3;
1199 if (hbhlen != ext->m_len) {
1201 ip6stat.ip6s_tooshort++;
1207 * XXX: We copy whole the header even if a jumbo
1208 * payload option is included, which option is to
1209 * be removed before returning in the RFC 2292.
1210 * Note: this constraint is removed in 2292bis.
1212 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1213 IPV6_HOPOPTS, IPPROTO_IPV6);
1215 mp = &(*mp)->m_next;
1216 #ifdef PULLDOWN_TEST
1222 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1223 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1224 int proto, off, nxt;
1227 * go through the header chain to see if a routing header is
1228 * contained in the packet. We need this information to store
1229 * destination options headers (if any) properly.
1230 * XXX: performance issue. We should record this info when
1231 * processing extension headers in incoming routine.
1234 proto = IPPROTO_IPV6;
1240 newoff = ip6_nexthdr(m, off, proto, &nxt);
1243 if (newoff < off) /* invalid, check for safety */
1245 if ((proto = nxt) == IPPROTO_ROUTING) {
1253 if ((in6p->in6p_flags &
1254 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1255 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1256 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1259 * Search for destination options headers or routing
1260 * header(s) through the header chain, and stores each
1261 * header as ancillary data.
1262 * Note that the order of the headers remains in
1263 * the chain of ancillary data.
1265 while (1) { /* is explicit loop prevention necessary? */
1266 struct ip6_ext *ip6e = NULL;
1268 #ifdef PULLDOWN_TEST
1269 struct mbuf *ext = NULL;
1273 * if it is not an extension header, don't try to
1274 * pull it from the chain.
1277 case IPPROTO_DSTOPTS:
1278 case IPPROTO_ROUTING:
1279 case IPPROTO_HOPOPTS:
1280 case IPPROTO_AH: /* is it possible? */
1286 #ifndef PULLDOWN_TEST
1287 if (off + sizeof(*ip6e) > m->m_len)
1289 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1290 if (nxt == IPPROTO_AH)
1291 elen = (ip6e->ip6e_len + 2) << 2;
1293 elen = (ip6e->ip6e_len + 1) << 3;
1294 if (off + elen > m->m_len)
1297 ext = ip6_pullexthdr(m, off, nxt);
1299 ip6stat.ip6s_tooshort++;
1302 ip6e = mtod(ext, struct ip6_ext *);
1303 if (nxt == IPPROTO_AH)
1304 elen = (ip6e->ip6e_len + 2) << 2;
1306 elen = (ip6e->ip6e_len + 1) << 3;
1307 if (elen != ext->m_len) {
1309 ip6stat.ip6s_tooshort++;
1315 case IPPROTO_DSTOPTS:
1316 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1320 * We also require super-user privilege for
1322 * See the comments on IN6_HOPOPTS.
1327 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1331 mp = &(*mp)->m_next;
1333 case IPPROTO_ROUTING:
1334 if (!in6p->in6p_flags & IN6P_RTHDR)
1337 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1341 mp = &(*mp)->m_next;
1343 case IPPROTO_HOPOPTS:
1344 case IPPROTO_AH: /* is it possible? */
1349 * other cases have been filtered in the above.
1350 * none will visit this case. here we supply
1351 * the code just in case (nxt overwritten or
1354 #ifdef PULLDOWN_TEST
1361 /* proceed with the next header. */
1363 nxt = ip6e->ip6e_nxt;
1365 #ifdef PULLDOWN_TEST
1376 #ifdef PULLDOWN_TEST
1378 * pull single extension header from mbuf chain. returns single mbuf that
1379 * contains the result, or NULL on error.
1381 static struct mbuf *
1382 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1384 struct ip6_ext ip6e;
1390 case IPPROTO_DSTOPTS:
1391 case IPPROTO_ROUTING:
1392 case IPPROTO_HOPOPTS:
1393 case IPPROTO_AH: /* is it possible? */
1396 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1400 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1401 if (nxt == IPPROTO_AH)
1402 elen = (ip6e.ip6e_len + 2) << 2;
1404 elen = (ip6e.ip6e_len + 1) << 3;
1406 MGET(n, MB_DONTWAIT, MT_DATA);
1407 if (n && elen >= MLEN) {
1408 MCLGET(n, MB_DONTWAIT);
1409 if ((n->m_flags & M_EXT) == 0) {
1418 if (elen >= M_TRAILINGSPACE(n)) {
1423 m_copydata(m, off, elen, mtod(n, caddr_t));
1430 * Get pointer to the previous header followed by the header
1431 * currently processed.
1432 * XXX: This function supposes that
1433 * M includes all headers,
1434 * the next header field and the header length field of each header
1436 * the sum of each header length equals to OFF.
1437 * Because of these assumptions, this function must be called very
1438 * carefully. Moreover, it will not be used in the near future when
1439 * we develop `neater' mechanism to process extension headers.
1442 ip6_get_prevhdr(struct mbuf *m, int off)
1444 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1446 if (off == sizeof(struct ip6_hdr))
1447 return(&ip6->ip6_nxt);
1450 struct ip6_ext *ip6e = NULL;
1453 len = sizeof(struct ip6_hdr);
1455 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1458 case IPPROTO_FRAGMENT:
1459 len += sizeof(struct ip6_frag);
1462 len += (ip6e->ip6e_len + 2) << 2;
1465 len += (ip6e->ip6e_len + 1) << 3;
1468 nxt = ip6e->ip6e_nxt;
1471 return(&ip6e->ip6e_nxt);
1478 * get next header offset. m will be retained.
1481 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1484 struct ip6_ext ip6e;
1489 panic("ip6_nexthdr: m == NULL");
1490 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1495 if (m->m_pkthdr.len < off + sizeof(ip6))
1497 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1499 *nxtp = ip6.ip6_nxt;
1503 case IPPROTO_FRAGMENT:
1505 * terminate parsing if it is not the first fragment,
1506 * it does not make sense to parse through it.
1508 if (m->m_pkthdr.len < off + sizeof(fh))
1510 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1511 if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1514 *nxtp = fh.ip6f_nxt;
1515 off += sizeof(struct ip6_frag);
1519 if (m->m_pkthdr.len < off + sizeof(ip6e))
1521 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1523 *nxtp = ip6e.ip6e_nxt;
1524 off += (ip6e.ip6e_len + 2) << 2;
1527 case IPPROTO_HOPOPTS:
1528 case IPPROTO_ROUTING:
1529 case IPPROTO_DSTOPTS:
1530 if (m->m_pkthdr.len < off + sizeof(ip6e))
1532 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1534 *nxtp = ip6e.ip6e_nxt;
1535 off += (ip6e.ip6e_len + 1) << 3;
1540 case IPPROTO_IPCOMP:
1552 * get offset for the last header in the chain. m will be kept untainted.
1555 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1565 newoff = ip6_nexthdr(m, off, proto, nxtp);
1568 else if (newoff < off)
1569 return -1; /* invalid */
1570 else if (newoff == off)
1579 ip6_addaux(struct mbuf *m)
1581 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1583 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1584 sizeof (struct ip6aux),
1587 m_tag_prepend(m, tag);
1590 bzero(tag+1, sizeof (struct ip6aux));
1591 return tag ? (struct ip6aux*)(tag+1) : NULL;
1595 ip6_findaux(struct mbuf *m)
1597 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1598 return tag ? (struct ip6aux*)(tag+1) : NULL;
1602 ip6_delaux(struct mbuf *m)
1604 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1606 m_tag_delete(m, tag);
1610 * System control for IP6
1613 u_char inet6ctlerrmap[PRC_NCMDS] = {
1615 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1616 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1617 EMSGSIZE, EHOSTUNREACH, 0, 0,