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 1.19 2004/06/24 08:15:18 dillon 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/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;
149 struct pfil_head inet6_pfil_hook;
152 ip6_fw_chk_t *ip6_fw_chk_ptr;
153 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
154 int ip6_fw_enable = 1;
156 struct ip6stat ip6stat;
158 static void ip6_init2 (void *);
159 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
160 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
161 static int ip6_input(struct netmsg *msg);
163 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
167 * IP6 initialization: fill in IP6 protocol switch table.
168 * All protocols not implemented in kernel go to raw IP6 protocol handler.
173 struct ip6protosw *pr;
178 if (sizeof(struct protosw) != sizeof(struct ip6protosw))
179 panic("sizeof(protosw) != sizeof(ip6protosw)");
181 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
184 for (i = 0; i < IPPROTO_MAX; i++)
185 ip6_protox[i] = pr - inet6sw;
186 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
187 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
188 if (pr->pr_domain->dom_family == PF_INET6 &&
189 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
190 ip6_protox[pr->pr_protocol] = pr - inet6sw;
192 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
193 inet6_pfil_hook.ph_af = AF_INET6;
194 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
195 printf("%s: WARNING: unable to register pfil hook, "
196 "error %d\n", __func__, i);
199 netisr_register(NETISR_IPV6, cpu0_portfn, ip6_input);
203 * in many cases, random() here does NOT return random number
204 * as initialization during bootstrap time occur in fixed order.
207 ip6_flow_seq = random() ^ tv.tv_usec;
209 ip6_desync_factor = (random() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
213 ip6_init2(void *dummy)
217 * to route local address of p2p link to loopback,
218 * assign loopback address first.
220 in6_ifattach(&loif[0], NULL);
223 callout_init(&nd6_timer_ch);
224 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
226 /* router renumbering prefix list maintenance */
227 callout_init(&in6_rr_timer_ch);
228 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
230 /* timer for regeneranation of temporary addresses randomize ID */
231 callout_reset(&in6_tmpaddrtimer_ch,
232 (ip6_temp_preferred_lifetime - ip6_desync_factor -
233 ip6_temp_regen_advance) * hz,
234 in6_tmpaddrtimer, NULL);
238 /* This must be after route_init(), which is now SI_ORDER_THIRD */
239 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
241 extern struct route_in6 ip6_forward_rt;
245 ip6_input(struct netmsg *msg)
247 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
249 int off = sizeof(struct ip6_hdr), nest;
251 u_int32_t rtalert = ~0;
253 struct ifnet *deliverifp = NULL;
254 struct in6_addr odst;
259 * should the inner packet be considered authentic?
260 * see comment in ah4_input().
263 m->m_flags &= ~M_AUTHIPHDR;
264 m->m_flags &= ~M_AUTHIPDGM;
269 * make sure we don't have onion peering information into m_aux.
276 if (m->m_flags & M_EXT) {
278 ip6stat.ip6s_mext2m++;
280 ip6stat.ip6s_mext1++;
282 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
284 if (m->m_flags & M_LOOP) {
285 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
286 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
287 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
289 ip6stat.ip6s_m2m[0]++;
295 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
296 ip6stat.ip6s_total++;
298 #ifndef PULLDOWN_TEST
300 * L2 bridge code and some other code can return mbuf chain
301 * that does not conform to KAME requirement. too bad.
302 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
304 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
307 MGETHDR(n, MB_DONTWAIT, MT_HEADER);
310 if (n && n->m_pkthdr.len > MHLEN) {
311 MCLGET(n, MB_DONTWAIT);
312 if ((n->m_flags & M_EXT) == 0) {
320 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
321 n->m_len = n->m_pkthdr.len;
325 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), EASYNC);
328 if (m->m_len < sizeof(struct ip6_hdr)) {
330 inifp = m->m_pkthdr.rcvif;
331 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
332 ip6stat.ip6s_toosmall++;
333 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
338 ip6 = mtod(m, struct ip6_hdr *);
340 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
341 ip6stat.ip6s_badvers++;
342 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
347 * Run through list of hooks for input packets.
349 * NB: Beware of the destination address changing
350 * (e.g. by NAT rewriting). When this happens,
351 * tell ip6_forward to do the right thing.
353 if (pfil_has_hooks(&inet6_pfil_hook)) {
355 if (pfil_run_hooks(&inet6_pfil_hook, &m,
356 m->m_pkthdr.rcvif, PFIL_IN)) {
359 if (m == NULL) /* consumed by filter */
361 ip6 = mtod(m, struct ip6_hdr *);
362 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
365 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
368 * Check with the firewall...
370 if (ip6_fw_enable && ip6_fw_chk_ptr) {
372 /* If ipfw says divert, we have to just drop packet */
373 /* use port as a dummy argument */
374 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
383 * Check against address spoofing/corruption.
385 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
386 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
388 * XXX: "badscope" is not very suitable for a multicast source.
390 ip6stat.ip6s_badscope++;
391 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
394 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
395 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
396 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
397 ip6stat.ip6s_badscope++;
398 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
403 * The following check is not documented in specs. A malicious
404 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
405 * and bypass security checks (act as if it was from 127.0.0.1 by using
406 * IPv6 src ::ffff:127.0.0.1). Be cautious.
408 * This check chokes if we are in an SIIT cloud. As none of BSDs
409 * support IPv4-less kernel compilation, we cannot support SIIT
410 * environment at all. So, it makes more sense for us to reject any
411 * malicious packets for non-SIIT environment, than try to do a
412 * partical support for SIIT environment.
414 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
415 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
416 ip6stat.ip6s_badscope++;
417 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
422 * Reject packets with IPv4 compatible addresses (auto tunnel).
424 * The code forbids auto tunnel relay case in RFC1933 (the check is
425 * stronger than RFC1933). We may want to re-enable it if mech-xx
426 * is revised to forbid relaying case.
428 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
429 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
430 ip6stat.ip6s_badscope++;
431 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
436 /* drop packets if interface ID portion is already filled */
437 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
438 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
439 ip6->ip6_src.s6_addr16[1]) {
440 ip6stat.ip6s_badscope++;
443 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
444 ip6->ip6_dst.s6_addr16[1]) {
445 ip6stat.ip6s_badscope++;
450 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
451 ip6->ip6_src.s6_addr16[1]
452 = htons(m->m_pkthdr.rcvif->if_index);
453 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
454 ip6->ip6_dst.s6_addr16[1]
455 = htons(m->m_pkthdr.rcvif->if_index);
457 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
459 * We use rt->rt_ifp to determine if the address is ours or not.
460 * If rt_ifp is lo0, the address is ours.
461 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
462 * so any address under fe80::%lo0/64 will be mistakenly considered
463 * local. The special case is supplied to handle the case properly
464 * by actually looking at interface addresses
465 * (using in6ifa_ifpwithaddr).
467 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
468 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
469 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
470 icmp6_error(m, ICMP6_DST_UNREACH,
471 ICMP6_DST_UNREACH_ADDR, 0);
472 /* m is already freed */
477 deliverifp = m->m_pkthdr.rcvif;
485 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
486 struct in6_multi *in6m = 0;
488 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
490 * See if we belong to the destination multicast group on the
493 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
496 else if (!ip6_mrouter) {
497 ip6stat.ip6s_notmember++;
498 ip6stat.ip6s_cantforward++;
499 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
502 deliverifp = m->m_pkthdr.rcvif;
509 switch (ip6_ours_check_algorithm) {
512 * XXX: I intentionally broke our indentation rule here,
513 * since this switch-case is just for measurement and
514 * therefore should soon be removed.
516 if (ip6_forward_rt.ro_rt != NULL &&
517 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
518 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
519 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
520 ip6stat.ip6s_forward_cachehit++;
522 struct sockaddr_in6 *dst6;
524 if (ip6_forward_rt.ro_rt) {
525 /* route is down or destination is different */
526 ip6stat.ip6s_forward_cachemiss++;
527 RTFREE(ip6_forward_rt.ro_rt);
528 ip6_forward_rt.ro_rt = 0;
531 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
532 dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
533 dst6->sin6_len = sizeof(struct sockaddr_in6);
534 dst6->sin6_family = AF_INET6;
535 dst6->sin6_addr = ip6->ip6_dst;
537 ip6_forward_rt.ro_dst.sin6_scope_id =
538 in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_dst);
541 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
544 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
547 * Accept the packet if the forwarding interface to the destination
548 * according to the routing table is the loopback interface,
549 * unless the associated route has a gateway.
550 * Note that this approach causes to accept a packet if there is a
551 * route to the loopback interface for the destination of the packet.
552 * But we think it's even useful in some situations, e.g. when using
553 * a special daemon which wants to intercept the packet.
555 * XXX: some OSes automatically make a cloned route for the destination
556 * of an outgoing packet. If the outgoing interface of the packet
557 * is a loopback one, the kernel would consider the packet to be
558 * accepted, even if we have no such address assinged on the interface.
559 * We check the cloned flag of the route entry to reject such cases,
560 * assuming that route entries for our own addresses are not made by
561 * cloning (it should be true because in6_addloop explicitly installs
562 * the host route). However, we might have to do an explicit check
563 * while it would be less efficient. Or, should we rather install a
564 * reject route for such a case?
566 if (ip6_forward_rt.ro_rt &&
567 (ip6_forward_rt.ro_rt->rt_flags &
568 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
570 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
573 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
577 * The check below is redundant since the comparison of
578 * the destination and the key of the rtentry has
579 * already done through looking up the routing table.
581 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
582 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
584 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
585 struct in6_ifaddr *ia6 =
586 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
589 * record address information into m_aux.
591 (void)ip6_setdstifaddr(m, ia6);
594 * packets to a tentative, duplicated, or somehow invalid
595 * address must not be accepted.
597 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
598 /* this address is ready */
600 deliverifp = ia6->ia_ifp; /* correct? */
601 /* Count the packet in the ip address stats */
602 ia6->ia_ifa.if_ipackets++;
603 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
606 /* address is not ready, so discard the packet. */
608 "ip6_input: packet to an unready address %s->%s\n",
609 ip6_sprintf(&ip6->ip6_src),
610 ip6_sprintf(&ip6->ip6_dst)));
615 } /* XXX indentation (see above) */
618 * FAITH(Firewall Aided Internet Translator)
621 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
622 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
623 /* XXX do we need more sanity checks? */
625 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
631 * Now there is no reason to process the packet if it's not our own
632 * and we're not a router.
634 if (!ip6_forwarding) {
635 ip6stat.ip6s_cantforward++;
636 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
642 * record address information into m_aux, if we don't have one yet.
643 * note that we are unable to record it, if the address is not listed
644 * as our interface address (e.g. multicast addresses, addresses
645 * within FAITH prefixes and such).
647 if (deliverifp && !ip6_getdstifaddr(m)) {
648 struct in6_ifaddr *ia6;
650 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
652 if (!ip6_setdstifaddr(m, ia6)) {
654 * XXX maybe we should drop the packet here,
655 * as we could not provide enough information
656 * to the upper layers.
663 * Process Hop-by-Hop options header if it's contained.
664 * m may be modified in ip6_hopopts_input().
665 * If a JumboPayload option is included, plen will also be modified.
667 plen = (u_int32_t)ntohs(ip6->ip6_plen);
668 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
671 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
672 #if 0 /*touches NULL pointer*/
673 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
675 goto bad2; /* m have already been freed */
679 ip6 = mtod(m, struct ip6_hdr *);
682 * if the payload length field is 0 and the next header field
683 * indicates Hop-by-Hop Options header, then a Jumbo Payload
684 * option MUST be included.
686 if (ip6->ip6_plen == 0 && plen == 0) {
688 * Note that if a valid jumbo payload option is
689 * contained, ip6_hoptops_input() must set a valid
690 * (non-zero) payload length to the variable plen.
692 ip6stat.ip6s_badoptions++;
693 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
694 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
695 icmp6_error(m, ICMP6_PARAM_PROB,
696 ICMP6_PARAMPROB_HEADER,
697 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
700 #ifndef PULLDOWN_TEST
701 /* ip6_hopopts_input() ensures that mbuf is contiguous */
702 hbh = (struct ip6_hbh *)(ip6 + 1);
704 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
705 sizeof(struct ip6_hbh));
707 ip6stat.ip6s_tooshort++;
714 * accept the packet if a router alert option is included
715 * and we act as an IPv6 router.
717 if (rtalert != ~0 && ip6_forwarding)
723 * Check that the amount of data in the buffers
724 * is as at least much as the IPv6 header would have us expect.
725 * Trim mbufs if longer than we expect.
726 * Drop packet if shorter than we expect.
728 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
729 ip6stat.ip6s_tooshort++;
730 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
733 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
734 if (m->m_len == m->m_pkthdr.len) {
735 m->m_len = sizeof(struct ip6_hdr) + plen;
736 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
738 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
742 * Forward if desirable.
744 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
746 * If we are acting as a multicast router, all
747 * incoming multicast packets are passed to the
748 * kernel-level multicast forwarding function.
749 * The packet is returned (relatively) intact; if
750 * ip6_mforward() returns a non-zero value, the packet
751 * must be discarded, else it may be accepted below.
753 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
754 ip6stat.ip6s_cantforward++;
760 ip6_forward(m, srcrt);
764 ip6 = mtod(m, struct ip6_hdr *);
767 * Malicious party may be able to use IPv4 mapped addr to confuse
768 * tcp/udp stack and bypass security checks (act as if it was from
769 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
771 * For SIIT end node behavior, you may want to disable the check.
772 * However, you will become vulnerable to attacks using IPv4 mapped
775 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
776 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
777 ip6stat.ip6s_badscope++;
778 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
783 * Tell launch routine the next header
785 ip6stat.ip6s_delivered++;
786 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
789 while (nxt != IPPROTO_DONE) {
790 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
791 ip6stat.ip6s_toomanyhdr++;
796 * protection against faulty packet - there should be
797 * more sanity checks in header chain processing.
799 if (m->m_pkthdr.len < off) {
800 ip6stat.ip6s_tooshort++;
801 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
807 * do we need to do it for every header? yeah, other
808 * functions can play with it (like re-allocate and copy).
810 mhist = ip6_addaux(m);
811 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
812 hist = mtod(mhist, caddr_t) + mhist->m_len;
813 bcopy(&nxt, hist, sizeof(nxt));
814 mhist->m_len += sizeof(nxt);
816 ip6stat.ip6s_toomanyhdr++;
823 * enforce IPsec policy checking if we are seeing last header.
824 * note that we do not visit this with protocols with pcb layer
825 * code - like udp/tcp/raw ip.
827 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
828 ipsec6_in_reject(m, NULL)) {
829 ipsec6stat.in_polvio++;
834 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
840 lwkt_replymsg(&msg->nm_lmsg, 0);
845 * set/grab in6_ifaddr correspond to IPv6 destination address.
846 * XXX backward compatibility wrapper
848 static struct ip6aux *
849 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
855 n->ip6a_dstia6 = ia6;
856 return n; /* NULL if failed to set */
860 ip6_getdstifaddr(struct mbuf *m)
866 return n->ip6a_dstia6;
872 * Hop-by-Hop options header processing. If a valid jumbo payload option is
873 * included, the real payload length will be stored in plenp.
876 ip6_hopopts_input(u_int32_t *plenp,
877 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
881 struct mbuf *m = *mp;
882 int off = *offp, hbhlen;
886 /* validation of the length of the header */
887 #ifndef PULLDOWN_TEST
888 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
889 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
890 hbhlen = (hbh->ip6h_len + 1) << 3;
892 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
893 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
895 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
896 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
898 ip6stat.ip6s_tooshort++;
901 hbhlen = (hbh->ip6h_len + 1) << 3;
902 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
905 ip6stat.ip6s_tooshort++;
910 hbhlen -= sizeof(struct ip6_hbh);
911 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
913 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
914 hbhlen, rtalertp, plenp) < 0)
923 * Search header for all Hop-by-hop options and process each option.
924 * This function is separate from ip6_hopopts_input() in order to
925 * handle a case where the sending node itself process its hop-by-hop
926 * options header. In such a case, the function is called from ip6_output().
928 * The function assumes that hbh header is located right after the IPv6 header
929 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
930 * opthead + hbhlen is located in continuous memory region.
933 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
934 u_int32_t *rtalertp, u_int32_t *plenp)
938 u_int8_t *opt = opthead;
939 u_int16_t rtalert_val;
941 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
943 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
949 if (hbhlen < IP6OPT_MINLEN) {
950 ip6stat.ip6s_toosmall++;
953 optlen = *(opt + 1) + 2;
956 /* XXX may need check for alignment */
957 if (hbhlen < IP6OPT_RTALERT_LEN) {
958 ip6stat.ip6s_toosmall++;
961 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
963 icmp6_error(m, ICMP6_PARAM_PROB,
964 ICMP6_PARAMPROB_HEADER,
965 erroff + opt + 1 - opthead);
968 optlen = IP6OPT_RTALERT_LEN;
969 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
970 *rtalertp = ntohs(rtalert_val);
973 /* XXX may need check for alignment */
974 if (hbhlen < IP6OPT_JUMBO_LEN) {
975 ip6stat.ip6s_toosmall++;
978 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
980 icmp6_error(m, ICMP6_PARAM_PROB,
981 ICMP6_PARAMPROB_HEADER,
982 erroff + opt + 1 - opthead);
985 optlen = IP6OPT_JUMBO_LEN;
988 * IPv6 packets that have non 0 payload length
989 * must not contain a jumbo payload option.
991 ip6 = mtod(m, struct ip6_hdr *);
993 ip6stat.ip6s_badoptions++;
994 icmp6_error(m, ICMP6_PARAM_PROB,
995 ICMP6_PARAMPROB_HEADER,
996 erroff + opt - opthead);
1001 * We may see jumbolen in unaligned location, so
1002 * we'd need to perform bcopy().
1004 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1005 jumboplen = (u_int32_t)htonl(jumboplen);
1009 * if there are multiple jumbo payload options,
1010 * *plenp will be non-zero and the packet will be
1012 * the behavior may need some debate in ipngwg -
1013 * multiple options does not make sense, however,
1014 * there's no explicit mention in specification.
1017 ip6stat.ip6s_badoptions++;
1018 icmp6_error(m, ICMP6_PARAM_PROB,
1019 ICMP6_PARAMPROB_HEADER,
1020 erroff + opt + 2 - opthead);
1026 * jumbo payload length must be larger than 65535.
1028 if (jumboplen <= IPV6_MAXPACKET) {
1029 ip6stat.ip6s_badoptions++;
1030 icmp6_error(m, ICMP6_PARAM_PROB,
1031 ICMP6_PARAMPROB_HEADER,
1032 erroff + opt + 2 - opthead);
1038 default: /* unknown option */
1039 if (hbhlen < IP6OPT_MINLEN) {
1040 ip6stat.ip6s_toosmall++;
1043 optlen = ip6_unknown_opt(opt, m,
1044 erroff + opt - opthead);
1060 * Unknown option processing.
1061 * The third argument `off' is the offset from the IPv6 header to the option,
1062 * which is necessary if the IPv6 header the and option header and IPv6 header
1063 * is not continuous in order to return an ICMPv6 error.
1066 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1068 struct ip6_hdr *ip6;
1070 switch (IP6OPT_TYPE(*optp)) {
1071 case IP6OPT_TYPE_SKIP: /* ignore the option */
1072 return((int)*(optp + 1));
1073 case IP6OPT_TYPE_DISCARD: /* silently discard */
1076 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1077 ip6stat.ip6s_badoptions++;
1078 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1080 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1081 ip6stat.ip6s_badoptions++;
1082 ip6 = mtod(m, struct ip6_hdr *);
1083 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1084 (m->m_flags & (M_BCAST|M_MCAST)))
1087 icmp6_error(m, ICMP6_PARAM_PROB,
1088 ICMP6_PARAMPROB_OPTION, off);
1092 m_freem(m); /* XXX: NOTREACHED */
1097 * Create the "control" list for this pcb.
1098 * The function will not modify mbuf chain at all.
1100 * with KAME mbuf chain restriction:
1101 * The routine will be called from upper layer handlers like tcp6_input().
1102 * Thus the routine assumes that the caller (tcp6_input) have already
1103 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1104 * very first mbuf on the mbuf chain.
1107 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1110 struct thread *td = curthread; /* XXX */
1112 int rthdr_exist = 0;
1119 if ((in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0) {
1123 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1124 SCM_TIMESTAMP, SOL_SOCKET);
1126 mp = &(*mp)->m_next;
1131 /* RFC 2292 sec. 5 */
1132 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1133 struct in6_pktinfo pi6;
1134 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1135 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1136 pi6.ipi6_addr.s6_addr16[1] = 0;
1137 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1138 ? m->m_pkthdr.rcvif->if_index
1140 *mp = sbcreatecontrol((caddr_t) &pi6,
1141 sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1144 mp = &(*mp)->m_next;
1147 if ((in6p->in6p_flags & IN6P_HOPLIMIT) != 0) {
1148 int hlim = ip6->ip6_hlim & 0xff;
1149 *mp = sbcreatecontrol((caddr_t) &hlim,
1150 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1152 mp = &(*mp)->m_next;
1156 * IPV6_HOPOPTS socket option. We require super-user privilege
1157 * for the option, but it might be too strict, since there might
1158 * be some hop-by-hop options which can be returned to normal user.
1159 * See RFC 2292 section 6.
1161 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1163 * Check if a hop-by-hop options header is contatined in the
1164 * received packet, and if so, store the options as ancillary
1165 * data. Note that a hop-by-hop options header must be
1166 * just after the IPv6 header, which fact is assured through
1167 * the IPv6 input processing.
1169 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1170 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1171 struct ip6_hbh *hbh;
1173 #ifdef PULLDOWN_TEST
1177 #ifndef PULLDOWN_TEST
1178 hbh = (struct ip6_hbh *)(ip6 + 1);
1179 hbhlen = (hbh->ip6h_len + 1) << 3;
1181 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1184 ip6stat.ip6s_tooshort++;
1187 hbh = mtod(ext, struct ip6_hbh *);
1188 hbhlen = (hbh->ip6h_len + 1) << 3;
1189 if (hbhlen != ext->m_len) {
1191 ip6stat.ip6s_tooshort++;
1197 * XXX: We copy whole the header even if a jumbo
1198 * payload option is included, which option is to
1199 * be removed before returning in the RFC 2292.
1200 * Note: this constraint is removed in 2292bis.
1202 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1203 IPV6_HOPOPTS, IPPROTO_IPV6);
1205 mp = &(*mp)->m_next;
1206 #ifdef PULLDOWN_TEST
1212 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1213 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1214 int proto, off, nxt;
1217 * go through the header chain to see if a routing header is
1218 * contained in the packet. We need this information to store
1219 * destination options headers (if any) properly.
1220 * XXX: performance issue. We should record this info when
1221 * processing extension headers in incoming routine.
1224 proto = IPPROTO_IPV6;
1230 newoff = ip6_nexthdr(m, off, proto, &nxt);
1233 if (newoff < off) /* invalid, check for safety */
1235 if ((proto = nxt) == IPPROTO_ROUTING) {
1243 if ((in6p->in6p_flags &
1244 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1245 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1246 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1249 * Search for destination options headers or routing
1250 * header(s) through the header chain, and stores each
1251 * header as ancillary data.
1252 * Note that the order of the headers remains in
1253 * the chain of ancillary data.
1255 while (1) { /* is explicit loop prevention necessary? */
1256 struct ip6_ext *ip6e = NULL;
1258 #ifdef PULLDOWN_TEST
1259 struct mbuf *ext = NULL;
1263 * if it is not an extension header, don't try to
1264 * pull it from the chain.
1267 case IPPROTO_DSTOPTS:
1268 case IPPROTO_ROUTING:
1269 case IPPROTO_HOPOPTS:
1270 case IPPROTO_AH: /* is it possible? */
1276 #ifndef PULLDOWN_TEST
1277 if (off + sizeof(*ip6e) > m->m_len)
1279 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1280 if (nxt == IPPROTO_AH)
1281 elen = (ip6e->ip6e_len + 2) << 2;
1283 elen = (ip6e->ip6e_len + 1) << 3;
1284 if (off + elen > m->m_len)
1287 ext = ip6_pullexthdr(m, off, nxt);
1289 ip6stat.ip6s_tooshort++;
1292 ip6e = mtod(ext, struct ip6_ext *);
1293 if (nxt == IPPROTO_AH)
1294 elen = (ip6e->ip6e_len + 2) << 2;
1296 elen = (ip6e->ip6e_len + 1) << 3;
1297 if (elen != ext->m_len) {
1299 ip6stat.ip6s_tooshort++;
1305 case IPPROTO_DSTOPTS:
1306 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1310 * We also require super-user privilege for
1312 * See the comments on IN6_HOPOPTS.
1317 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1321 mp = &(*mp)->m_next;
1323 case IPPROTO_ROUTING:
1324 if (!in6p->in6p_flags & IN6P_RTHDR)
1327 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1331 mp = &(*mp)->m_next;
1333 case IPPROTO_HOPOPTS:
1334 case IPPROTO_AH: /* is it possible? */
1339 * other cases have been filtered in the above.
1340 * none will visit this case. here we supply
1341 * the code just in case (nxt overwritten or
1344 #ifdef PULLDOWN_TEST
1351 /* proceed with the next header. */
1353 nxt = ip6e->ip6e_nxt;
1355 #ifdef PULLDOWN_TEST
1366 #ifdef PULLDOWN_TEST
1368 * pull single extension header from mbuf chain. returns single mbuf that
1369 * contains the result, or NULL on error.
1371 static struct mbuf *
1372 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1374 struct ip6_ext ip6e;
1380 case IPPROTO_DSTOPTS:
1381 case IPPROTO_ROUTING:
1382 case IPPROTO_HOPOPTS:
1383 case IPPROTO_AH: /* is it possible? */
1386 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1390 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1391 if (nxt == IPPROTO_AH)
1392 elen = (ip6e.ip6e_len + 2) << 2;
1394 elen = (ip6e.ip6e_len + 1) << 3;
1396 MGET(n, MB_DONTWAIT, MT_DATA);
1397 if (n && elen >= MLEN) {
1398 MCLGET(n, MB_DONTWAIT);
1399 if ((n->m_flags & M_EXT) == 0) {
1408 if (elen >= M_TRAILINGSPACE(n)) {
1413 m_copydata(m, off, elen, mtod(n, caddr_t));
1420 * Get pointer to the previous header followed by the header
1421 * currently processed.
1422 * XXX: This function supposes that
1423 * M includes all headers,
1424 * the next header field and the header length field of each header
1426 * the sum of each header length equals to OFF.
1427 * Because of these assumptions, this function must be called very
1428 * carefully. Moreover, it will not be used in the near future when
1429 * we develop `neater' mechanism to process extension headers.
1432 ip6_get_prevhdr(struct mbuf *m, int off)
1434 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1436 if (off == sizeof(struct ip6_hdr))
1437 return(&ip6->ip6_nxt);
1440 struct ip6_ext *ip6e = NULL;
1443 len = sizeof(struct ip6_hdr);
1445 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1448 case IPPROTO_FRAGMENT:
1449 len += sizeof(struct ip6_frag);
1452 len += (ip6e->ip6e_len + 2) << 2;
1455 len += (ip6e->ip6e_len + 1) << 3;
1458 nxt = ip6e->ip6e_nxt;
1461 return(&ip6e->ip6e_nxt);
1468 * get next header offset. m will be retained.
1471 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1474 struct ip6_ext ip6e;
1479 panic("ip6_nexthdr: m == NULL");
1480 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1485 if (m->m_pkthdr.len < off + sizeof(ip6))
1487 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1489 *nxtp = ip6.ip6_nxt;
1493 case IPPROTO_FRAGMENT:
1495 * terminate parsing if it is not the first fragment,
1496 * it does not make sense to parse through it.
1498 if (m->m_pkthdr.len < off + sizeof(fh))
1500 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1501 if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1504 *nxtp = fh.ip6f_nxt;
1505 off += sizeof(struct ip6_frag);
1509 if (m->m_pkthdr.len < off + sizeof(ip6e))
1511 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1513 *nxtp = ip6e.ip6e_nxt;
1514 off += (ip6e.ip6e_len + 2) << 2;
1517 case IPPROTO_HOPOPTS:
1518 case IPPROTO_ROUTING:
1519 case IPPROTO_DSTOPTS:
1520 if (m->m_pkthdr.len < off + sizeof(ip6e))
1522 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1524 *nxtp = ip6e.ip6e_nxt;
1525 off += (ip6e.ip6e_len + 1) << 3;
1530 case IPPROTO_IPCOMP:
1542 * get offset for the last header in the chain. m will be kept untainted.
1545 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1555 newoff = ip6_nexthdr(m, off, proto, nxtp);
1558 else if (newoff < off)
1559 return -1; /* invalid */
1560 else if (newoff == off)
1569 ip6_addaux(struct mbuf *m)
1571 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1573 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1574 sizeof (struct ip6aux),
1577 m_tag_prepend(m, tag);
1580 bzero(tag+1, sizeof (struct ip6aux));
1581 return tag ? (struct ip6aux*)(tag+1) : NULL;
1585 ip6_findaux(struct mbuf *m)
1587 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1588 return tag ? (struct ip6aux*)(tag+1) : NULL;
1592 ip6_delaux(struct mbuf *m)
1594 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1596 m_tag_delete(m, tag);
1600 * System control for IP6
1603 u_char inet6ctlerrmap[PRC_NCMDS] = {
1605 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1606 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1607 EMSGSIZE, EHOSTUNREACH, 0, 0,