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 1.23 2005/01/03 22:03:26 hsu 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>
121 #include <netproto/ipsec/ipsec.h>
122 #include <netproto/ipsec/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_init(&in6_tmpaddrtimer_ch);
232 callout_reset(&in6_tmpaddrtimer_ch,
233 (ip6_temp_preferred_lifetime - ip6_desync_factor -
234 ip6_temp_regen_advance) * hz,
235 in6_tmpaddrtimer, NULL);
239 /* This must be after route_init(), which is now SI_ORDER_THIRD */
240 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
242 extern struct route_in6 ip6_forward_rt;
246 ip6_input(struct netmsg *msg)
248 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
250 int off = sizeof(struct ip6_hdr), nest;
252 u_int32_t rtalert = ~0;
254 struct ifnet *deliverifp = NULL;
255 struct in6_addr odst;
260 * should the inner packet be considered authentic?
261 * see comment in ah4_input().
264 m->m_flags &= ~M_AUTHIPHDR;
265 m->m_flags &= ~M_AUTHIPDGM;
270 * make sure we don't have onion peering information into m_aux.
277 if (m->m_flags & M_EXT) {
279 ip6stat.ip6s_mext2m++;
281 ip6stat.ip6s_mext1++;
283 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
285 if (m->m_flags & M_LOOP) {
286 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
287 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
288 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
290 ip6stat.ip6s_m2m[0]++;
296 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
297 ip6stat.ip6s_total++;
299 #ifndef PULLDOWN_TEST
301 * L2 bridge code and some other code can return mbuf chain
302 * that does not conform to KAME requirement. too bad.
303 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
305 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
308 MGETHDR(n, MB_DONTWAIT, MT_HEADER);
311 if (n && n->m_pkthdr.len > MHLEN) {
312 MCLGET(n, MB_DONTWAIT);
313 if ((n->m_flags & M_EXT) == 0) {
321 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
322 n->m_len = n->m_pkthdr.len;
326 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), EASYNC);
329 if (m->m_len < sizeof(struct ip6_hdr)) {
331 inifp = m->m_pkthdr.rcvif;
332 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
333 ip6stat.ip6s_toosmall++;
334 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
339 ip6 = mtod(m, struct ip6_hdr *);
341 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
342 ip6stat.ip6s_badvers++;
343 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
348 * Run through list of hooks for input packets.
350 * NB: Beware of the destination address changing
351 * (e.g. by NAT rewriting). When this happens,
352 * tell ip6_forward to do the right thing.
354 if (pfil_has_hooks(&inet6_pfil_hook)) {
356 if (pfil_run_hooks(&inet6_pfil_hook, &m,
357 m->m_pkthdr.rcvif, PFIL_IN)) {
360 if (m == NULL) /* consumed by filter */
362 ip6 = mtod(m, struct ip6_hdr *);
363 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
366 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
369 * Check with the firewall...
371 if (ip6_fw_enable && ip6_fw_chk_ptr) {
373 /* If ipfw says divert, we have to just drop packet */
374 /* use port as a dummy argument */
375 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
384 * Check against address spoofing/corruption.
386 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
387 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
389 * XXX: "badscope" is not very suitable for a multicast source.
391 ip6stat.ip6s_badscope++;
392 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
395 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
396 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
397 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
398 ip6stat.ip6s_badscope++;
399 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
404 * The following check is not documented in specs. A malicious
405 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
406 * and bypass security checks (act as if it was from 127.0.0.1 by using
407 * IPv6 src ::ffff:127.0.0.1). Be cautious.
409 * This check chokes if we are in an SIIT cloud. As none of BSDs
410 * support IPv4-less kernel compilation, we cannot support SIIT
411 * environment at all. So, it makes more sense for us to reject any
412 * malicious packets for non-SIIT environment, than try to do a
413 * partical support for SIIT environment.
415 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
416 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
417 ip6stat.ip6s_badscope++;
418 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
423 * Reject packets with IPv4 compatible addresses (auto tunnel).
425 * The code forbids auto tunnel relay case in RFC1933 (the check is
426 * stronger than RFC1933). We may want to re-enable it if mech-xx
427 * is revised to forbid relaying case.
429 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
430 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
431 ip6stat.ip6s_badscope++;
432 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
437 /* drop packets if interface ID portion is already filled */
438 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
439 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
440 ip6->ip6_src.s6_addr16[1]) {
441 ip6stat.ip6s_badscope++;
444 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
445 ip6->ip6_dst.s6_addr16[1]) {
446 ip6stat.ip6s_badscope++;
451 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
452 ip6->ip6_src.s6_addr16[1]
453 = htons(m->m_pkthdr.rcvif->if_index);
454 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
455 ip6->ip6_dst.s6_addr16[1]
456 = htons(m->m_pkthdr.rcvif->if_index);
458 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
460 * We use rt->rt_ifp to determine if the address is ours or not.
461 * If rt_ifp is lo0, the address is ours.
462 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
463 * so any address under fe80::%lo0/64 will be mistakenly considered
464 * local. The special case is supplied to handle the case properly
465 * by actually looking at interface addresses
466 * (using in6ifa_ifpwithaddr).
468 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
469 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
470 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
471 icmp6_error(m, ICMP6_DST_UNREACH,
472 ICMP6_DST_UNREACH_ADDR, 0);
473 /* m is already freed */
478 deliverifp = m->m_pkthdr.rcvif;
486 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
487 struct in6_multi *in6m = 0;
489 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
491 * See if we belong to the destination multicast group on the
494 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
497 else if (!ip6_mrouter) {
498 ip6stat.ip6s_notmember++;
499 ip6stat.ip6s_cantforward++;
500 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
503 deliverifp = m->m_pkthdr.rcvif;
510 switch (ip6_ours_check_algorithm) {
513 * XXX: I intentionally broke our indentation rule here,
514 * since this switch-case is just for measurement and
515 * therefore should soon be removed.
517 if (ip6_forward_rt.ro_rt != NULL &&
518 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
519 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
520 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
521 ip6stat.ip6s_forward_cachehit++;
523 struct sockaddr_in6 *dst6;
525 if (ip6_forward_rt.ro_rt) {
526 /* route is down or destination is different */
527 ip6stat.ip6s_forward_cachemiss++;
528 RTFREE(ip6_forward_rt.ro_rt);
529 ip6_forward_rt.ro_rt = 0;
532 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
533 dst6 = &ip6_forward_rt.ro_dst;
534 dst6->sin6_len = sizeof(struct sockaddr_in6);
535 dst6->sin6_family = AF_INET6;
536 dst6->sin6_addr = ip6->ip6_dst;
538 ip6_forward_rt.ro_dst.sin6_scope_id =
539 in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_dst);
542 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
545 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
548 * Accept the packet if the forwarding interface to the destination
549 * according to the routing table is the loopback interface,
550 * unless the associated route has a gateway.
551 * Note that this approach causes to accept a packet if there is a
552 * route to the loopback interface for the destination of the packet.
553 * But we think it's even useful in some situations, e.g. when using
554 * a special daemon which wants to intercept the packet.
556 * XXX: some OSes automatically make a cloned route for the destination
557 * of an outgoing packet. If the outgoing interface of the packet
558 * is a loopback one, the kernel would consider the packet to be
559 * accepted, even if we have no such address assinged on the interface.
560 * We check the cloned flag of the route entry to reject such cases,
561 * assuming that route entries for our own addresses are not made by
562 * cloning (it should be true because in6_addloop explicitly installs
563 * the host route). However, we might have to do an explicit check
564 * while it would be less efficient. Or, should we rather install a
565 * reject route for such a case?
567 if (ip6_forward_rt.ro_rt &&
568 (ip6_forward_rt.ro_rt->rt_flags &
569 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
571 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
574 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
578 * The check below is redundant since the comparison of
579 * the destination and the key of the rtentry has
580 * already done through looking up the routing table.
582 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
583 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
585 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
586 struct in6_ifaddr *ia6 =
587 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
590 * record address information into m_aux.
592 (void)ip6_setdstifaddr(m, ia6);
595 * packets to a tentative, duplicated, or somehow invalid
596 * address must not be accepted.
598 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
599 /* this address is ready */
601 deliverifp = ia6->ia_ifp; /* correct? */
602 /* Count the packet in the ip address stats */
603 ia6->ia_ifa.if_ipackets++;
604 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
607 /* address is not ready, so discard the packet. */
609 "ip6_input: packet to an unready address %s->%s\n",
610 ip6_sprintf(&ip6->ip6_src),
611 ip6_sprintf(&ip6->ip6_dst)));
616 } /* XXX indentation (see above) */
619 * FAITH(Firewall Aided Internet Translator)
622 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
623 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
624 /* XXX do we need more sanity checks? */
626 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
632 * Now there is no reason to process the packet if it's not our own
633 * and we're not a router.
635 if (!ip6_forwarding) {
636 ip6stat.ip6s_cantforward++;
637 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
643 * record address information into m_aux, if we don't have one yet.
644 * note that we are unable to record it, if the address is not listed
645 * as our interface address (e.g. multicast addresses, addresses
646 * within FAITH prefixes and such).
648 if (deliverifp && !ip6_getdstifaddr(m)) {
649 struct in6_ifaddr *ia6;
651 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
653 if (!ip6_setdstifaddr(m, ia6)) {
655 * XXX maybe we should drop the packet here,
656 * as we could not provide enough information
657 * to the upper layers.
664 * Process Hop-by-Hop options header if it's contained.
665 * m may be modified in ip6_hopopts_input().
666 * If a JumboPayload option is included, plen will also be modified.
668 plen = (u_int32_t)ntohs(ip6->ip6_plen);
669 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
672 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
673 #if 0 /*touches NULL pointer*/
674 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
676 goto bad2; /* m have already been freed */
680 ip6 = mtod(m, struct ip6_hdr *);
683 * if the payload length field is 0 and the next header field
684 * indicates Hop-by-Hop Options header, then a Jumbo Payload
685 * option MUST be included.
687 if (ip6->ip6_plen == 0 && plen == 0) {
689 * Note that if a valid jumbo payload option is
690 * contained, ip6_hoptops_input() must set a valid
691 * (non-zero) payload length to the variable plen.
693 ip6stat.ip6s_badoptions++;
694 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
695 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
696 icmp6_error(m, ICMP6_PARAM_PROB,
697 ICMP6_PARAMPROB_HEADER,
698 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
701 #ifndef PULLDOWN_TEST
702 /* ip6_hopopts_input() ensures that mbuf is contiguous */
703 hbh = (struct ip6_hbh *)(ip6 + 1);
705 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
706 sizeof(struct ip6_hbh));
708 ip6stat.ip6s_tooshort++;
715 * accept the packet if a router alert option is included
716 * and we act as an IPv6 router.
718 if (rtalert != ~0 && ip6_forwarding)
724 * Check that the amount of data in the buffers
725 * is as at least much as the IPv6 header would have us expect.
726 * Trim mbufs if longer than we expect.
727 * Drop packet if shorter than we expect.
729 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
730 ip6stat.ip6s_tooshort++;
731 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
734 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
735 if (m->m_len == m->m_pkthdr.len) {
736 m->m_len = sizeof(struct ip6_hdr) + plen;
737 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
739 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
743 * Forward if desirable.
745 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
747 * If we are acting as a multicast router, all
748 * incoming multicast packets are passed to the
749 * kernel-level multicast forwarding function.
750 * The packet is returned (relatively) intact; if
751 * ip6_mforward() returns a non-zero value, the packet
752 * must be discarded, else it may be accepted below.
754 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
755 ip6stat.ip6s_cantforward++;
761 ip6_forward(m, srcrt);
765 ip6 = mtod(m, struct ip6_hdr *);
768 * Malicious party may be able to use IPv4 mapped addr to confuse
769 * tcp/udp stack and bypass security checks (act as if it was from
770 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
772 * For SIIT end node behavior, you may want to disable the check.
773 * However, you will become vulnerable to attacks using IPv4 mapped
776 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
777 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
778 ip6stat.ip6s_badscope++;
779 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
784 * Tell launch routine the next header
786 ip6stat.ip6s_delivered++;
787 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
790 while (nxt != IPPROTO_DONE) {
791 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
792 ip6stat.ip6s_toomanyhdr++;
797 * protection against faulty packet - there should be
798 * more sanity checks in header chain processing.
800 if (m->m_pkthdr.len < off) {
801 ip6stat.ip6s_tooshort++;
802 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
808 * do we need to do it for every header? yeah, other
809 * functions can play with it (like re-allocate and copy).
811 mhist = ip6_addaux(m);
812 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
813 hist = mtod(mhist, caddr_t) + mhist->m_len;
814 bcopy(&nxt, hist, sizeof(nxt));
815 mhist->m_len += sizeof(nxt);
817 ip6stat.ip6s_toomanyhdr++;
824 * enforce IPsec policy checking if we are seeing last header.
825 * note that we do not visit this with protocols with pcb layer
826 * code - like udp/tcp/raw ip.
828 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
829 ipsec6_in_reject(m, NULL)) {
830 ipsec6stat.in_polvio++;
835 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
841 lwkt_replymsg(&msg->nm_lmsg, 0);
846 * set/grab in6_ifaddr correspond to IPv6 destination address.
847 * XXX backward compatibility wrapper
849 static struct ip6aux *
850 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
856 n->ip6a_dstia6 = ia6;
857 return n; /* NULL if failed to set */
861 ip6_getdstifaddr(struct mbuf *m)
867 return n->ip6a_dstia6;
873 * Hop-by-Hop options header processing. If a valid jumbo payload option is
874 * included, the real payload length will be stored in plenp.
877 ip6_hopopts_input(u_int32_t *plenp,
878 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
882 struct mbuf *m = *mp;
883 int off = *offp, hbhlen;
887 /* validation of the length of the header */
888 #ifndef PULLDOWN_TEST
889 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
890 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
891 hbhlen = (hbh->ip6h_len + 1) << 3;
893 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
894 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
896 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
897 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
899 ip6stat.ip6s_tooshort++;
902 hbhlen = (hbh->ip6h_len + 1) << 3;
903 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
906 ip6stat.ip6s_tooshort++;
911 hbhlen -= sizeof(struct ip6_hbh);
912 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
914 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
915 hbhlen, rtalertp, plenp) < 0)
924 * Search header for all Hop-by-hop options and process each option.
925 * This function is separate from ip6_hopopts_input() in order to
926 * handle a case where the sending node itself process its hop-by-hop
927 * options header. In such a case, the function is called from ip6_output().
929 * The function assumes that hbh header is located right after the IPv6 header
930 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
931 * opthead + hbhlen is located in continuous memory region.
934 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
935 u_int32_t *rtalertp, u_int32_t *plenp)
939 u_int8_t *opt = opthead;
940 u_int16_t rtalert_val;
942 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
944 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
950 if (hbhlen < IP6OPT_MINLEN) {
951 ip6stat.ip6s_toosmall++;
954 optlen = *(opt + 1) + 2;
957 /* XXX may need check for alignment */
958 if (hbhlen < IP6OPT_RTALERT_LEN) {
959 ip6stat.ip6s_toosmall++;
962 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
964 icmp6_error(m, ICMP6_PARAM_PROB,
965 ICMP6_PARAMPROB_HEADER,
966 erroff + opt + 1 - opthead);
969 optlen = IP6OPT_RTALERT_LEN;
970 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
971 *rtalertp = ntohs(rtalert_val);
974 /* XXX may need check for alignment */
975 if (hbhlen < IP6OPT_JUMBO_LEN) {
976 ip6stat.ip6s_toosmall++;
979 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
981 icmp6_error(m, ICMP6_PARAM_PROB,
982 ICMP6_PARAMPROB_HEADER,
983 erroff + opt + 1 - opthead);
986 optlen = IP6OPT_JUMBO_LEN;
989 * IPv6 packets that have non 0 payload length
990 * must not contain a jumbo payload option.
992 ip6 = mtod(m, struct ip6_hdr *);
994 ip6stat.ip6s_badoptions++;
995 icmp6_error(m, ICMP6_PARAM_PROB,
996 ICMP6_PARAMPROB_HEADER,
997 erroff + opt - opthead);
1002 * We may see jumbolen in unaligned location, so
1003 * we'd need to perform bcopy().
1005 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1006 jumboplen = (u_int32_t)htonl(jumboplen);
1010 * if there are multiple jumbo payload options,
1011 * *plenp will be non-zero and the packet will be
1013 * the behavior may need some debate in ipngwg -
1014 * multiple options does not make sense, however,
1015 * there's no explicit mention in specification.
1018 ip6stat.ip6s_badoptions++;
1019 icmp6_error(m, ICMP6_PARAM_PROB,
1020 ICMP6_PARAMPROB_HEADER,
1021 erroff + opt + 2 - opthead);
1027 * jumbo payload length must be larger than 65535.
1029 if (jumboplen <= IPV6_MAXPACKET) {
1030 ip6stat.ip6s_badoptions++;
1031 icmp6_error(m, ICMP6_PARAM_PROB,
1032 ICMP6_PARAMPROB_HEADER,
1033 erroff + opt + 2 - opthead);
1039 default: /* unknown option */
1040 if (hbhlen < IP6OPT_MINLEN) {
1041 ip6stat.ip6s_toosmall++;
1044 optlen = ip6_unknown_opt(opt, m,
1045 erroff + opt - opthead);
1061 * Unknown option processing.
1062 * The third argument `off' is the offset from the IPv6 header to the option,
1063 * which is necessary if the IPv6 header the and option header and IPv6 header
1064 * is not continuous in order to return an ICMPv6 error.
1067 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1069 struct ip6_hdr *ip6;
1071 switch (IP6OPT_TYPE(*optp)) {
1072 case IP6OPT_TYPE_SKIP: /* ignore the option */
1073 return((int)*(optp + 1));
1074 case IP6OPT_TYPE_DISCARD: /* silently discard */
1077 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1078 ip6stat.ip6s_badoptions++;
1079 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1081 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1082 ip6stat.ip6s_badoptions++;
1083 ip6 = mtod(m, struct ip6_hdr *);
1084 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1085 (m->m_flags & (M_BCAST|M_MCAST)))
1088 icmp6_error(m, ICMP6_PARAM_PROB,
1089 ICMP6_PARAMPROB_OPTION, off);
1093 m_freem(m); /* XXX: NOTREACHED */
1098 * Create the "control" list for this pcb.
1099 * The function will not modify mbuf chain at all.
1101 * with KAME mbuf chain restriction:
1102 * The routine will be called from upper layer handlers like tcp6_input().
1103 * Thus the routine assumes that the caller (tcp6_input) have already
1104 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1105 * very first mbuf on the mbuf chain.
1108 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1111 struct thread *td = curthread; /* XXX */
1113 int rthdr_exist = 0;
1120 if ((in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0) {
1124 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1125 SCM_TIMESTAMP, SOL_SOCKET);
1127 mp = &(*mp)->m_next;
1132 /* RFC 2292 sec. 5 */
1133 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1134 struct in6_pktinfo pi6;
1135 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1136 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1137 pi6.ipi6_addr.s6_addr16[1] = 0;
1138 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1139 ? m->m_pkthdr.rcvif->if_index
1141 *mp = sbcreatecontrol((caddr_t) &pi6,
1142 sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1145 mp = &(*mp)->m_next;
1148 if ((in6p->in6p_flags & IN6P_HOPLIMIT) != 0) {
1149 int hlim = ip6->ip6_hlim & 0xff;
1150 *mp = sbcreatecontrol((caddr_t) &hlim,
1151 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1153 mp = &(*mp)->m_next;
1157 * IPV6_HOPOPTS socket option. We require super-user privilege
1158 * for the option, but it might be too strict, since there might
1159 * be some hop-by-hop options which can be returned to normal user.
1160 * See RFC 2292 section 6.
1162 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1164 * Check if a hop-by-hop options header is contatined in the
1165 * received packet, and if so, store the options as ancillary
1166 * data. Note that a hop-by-hop options header must be
1167 * just after the IPv6 header, which fact is assured through
1168 * the IPv6 input processing.
1170 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1171 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1172 struct ip6_hbh *hbh;
1174 #ifdef PULLDOWN_TEST
1178 #ifndef PULLDOWN_TEST
1179 hbh = (struct ip6_hbh *)(ip6 + 1);
1180 hbhlen = (hbh->ip6h_len + 1) << 3;
1182 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1185 ip6stat.ip6s_tooshort++;
1188 hbh = mtod(ext, struct ip6_hbh *);
1189 hbhlen = (hbh->ip6h_len + 1) << 3;
1190 if (hbhlen != ext->m_len) {
1192 ip6stat.ip6s_tooshort++;
1198 * XXX: We copy whole the header even if a jumbo
1199 * payload option is included, which option is to
1200 * be removed before returning in the RFC 2292.
1201 * Note: this constraint is removed in 2292bis.
1203 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1204 IPV6_HOPOPTS, IPPROTO_IPV6);
1206 mp = &(*mp)->m_next;
1207 #ifdef PULLDOWN_TEST
1213 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1214 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1215 int proto, off, nxt;
1218 * go through the header chain to see if a routing header is
1219 * contained in the packet. We need this information to store
1220 * destination options headers (if any) properly.
1221 * XXX: performance issue. We should record this info when
1222 * processing extension headers in incoming routine.
1225 proto = IPPROTO_IPV6;
1231 newoff = ip6_nexthdr(m, off, proto, &nxt);
1234 if (newoff < off) /* invalid, check for safety */
1236 if ((proto = nxt) == IPPROTO_ROUTING) {
1244 if ((in6p->in6p_flags &
1245 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1246 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1247 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1250 * Search for destination options headers or routing
1251 * header(s) through the header chain, and stores each
1252 * header as ancillary data.
1253 * Note that the order of the headers remains in
1254 * the chain of ancillary data.
1256 while (1) { /* is explicit loop prevention necessary? */
1257 struct ip6_ext *ip6e = NULL;
1259 #ifdef PULLDOWN_TEST
1260 struct mbuf *ext = NULL;
1264 * if it is not an extension header, don't try to
1265 * pull it from the chain.
1268 case IPPROTO_DSTOPTS:
1269 case IPPROTO_ROUTING:
1270 case IPPROTO_HOPOPTS:
1271 case IPPROTO_AH: /* is it possible? */
1277 #ifndef PULLDOWN_TEST
1278 if (off + sizeof(*ip6e) > m->m_len)
1280 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1281 if (nxt == IPPROTO_AH)
1282 elen = (ip6e->ip6e_len + 2) << 2;
1284 elen = (ip6e->ip6e_len + 1) << 3;
1285 if (off + elen > m->m_len)
1288 ext = ip6_pullexthdr(m, off, nxt);
1290 ip6stat.ip6s_tooshort++;
1293 ip6e = mtod(ext, struct ip6_ext *);
1294 if (nxt == IPPROTO_AH)
1295 elen = (ip6e->ip6e_len + 2) << 2;
1297 elen = (ip6e->ip6e_len + 1) << 3;
1298 if (elen != ext->m_len) {
1300 ip6stat.ip6s_tooshort++;
1306 case IPPROTO_DSTOPTS:
1307 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1311 * We also require super-user privilege for
1313 * See the comments on IN6_HOPOPTS.
1318 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1322 mp = &(*mp)->m_next;
1324 case IPPROTO_ROUTING:
1325 if (!in6p->in6p_flags & IN6P_RTHDR)
1328 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1332 mp = &(*mp)->m_next;
1334 case IPPROTO_HOPOPTS:
1335 case IPPROTO_AH: /* is it possible? */
1340 * other cases have been filtered in the above.
1341 * none will visit this case. here we supply
1342 * the code just in case (nxt overwritten or
1345 #ifdef PULLDOWN_TEST
1352 /* proceed with the next header. */
1354 nxt = ip6e->ip6e_nxt;
1356 #ifdef PULLDOWN_TEST
1367 #ifdef PULLDOWN_TEST
1369 * pull single extension header from mbuf chain. returns single mbuf that
1370 * contains the result, or NULL on error.
1372 static struct mbuf *
1373 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1375 struct ip6_ext ip6e;
1381 case IPPROTO_DSTOPTS:
1382 case IPPROTO_ROUTING:
1383 case IPPROTO_HOPOPTS:
1384 case IPPROTO_AH: /* is it possible? */
1387 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1391 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1392 if (nxt == IPPROTO_AH)
1393 elen = (ip6e.ip6e_len + 2) << 2;
1395 elen = (ip6e.ip6e_len + 1) << 3;
1397 MGET(n, MB_DONTWAIT, MT_DATA);
1398 if (n && elen >= MLEN) {
1399 MCLGET(n, MB_DONTWAIT);
1400 if ((n->m_flags & M_EXT) == 0) {
1409 if (elen >= M_TRAILINGSPACE(n)) {
1414 m_copydata(m, off, elen, mtod(n, caddr_t));
1421 * Get pointer to the previous header followed by the header
1422 * currently processed.
1423 * XXX: This function supposes that
1424 * M includes all headers,
1425 * the next header field and the header length field of each header
1427 * the sum of each header length equals to OFF.
1428 * Because of these assumptions, this function must be called very
1429 * carefully. Moreover, it will not be used in the near future when
1430 * we develop `neater' mechanism to process extension headers.
1433 ip6_get_prevhdr(struct mbuf *m, int off)
1435 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1437 if (off == sizeof(struct ip6_hdr))
1438 return(&ip6->ip6_nxt);
1441 struct ip6_ext *ip6e = NULL;
1444 len = sizeof(struct ip6_hdr);
1446 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1449 case IPPROTO_FRAGMENT:
1450 len += sizeof(struct ip6_frag);
1453 len += (ip6e->ip6e_len + 2) << 2;
1456 len += (ip6e->ip6e_len + 1) << 3;
1459 nxt = ip6e->ip6e_nxt;
1462 return(&ip6e->ip6e_nxt);
1469 * get next header offset. m will be retained.
1472 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1475 struct ip6_ext ip6e;
1480 panic("ip6_nexthdr: m == NULL");
1481 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1486 if (m->m_pkthdr.len < off + sizeof(ip6))
1488 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1490 *nxtp = ip6.ip6_nxt;
1494 case IPPROTO_FRAGMENT:
1496 * terminate parsing if it is not the first fragment,
1497 * it does not make sense to parse through it.
1499 if (m->m_pkthdr.len < off + sizeof(fh))
1501 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1502 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1503 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1506 *nxtp = fh.ip6f_nxt;
1507 off += sizeof(struct ip6_frag);
1511 if (m->m_pkthdr.len < off + sizeof(ip6e))
1513 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1515 *nxtp = ip6e.ip6e_nxt;
1516 off += (ip6e.ip6e_len + 2) << 2;
1519 case IPPROTO_HOPOPTS:
1520 case IPPROTO_ROUTING:
1521 case IPPROTO_DSTOPTS:
1522 if (m->m_pkthdr.len < off + sizeof(ip6e))
1524 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1526 *nxtp = ip6e.ip6e_nxt;
1527 off += (ip6e.ip6e_len + 1) << 3;
1532 case IPPROTO_IPCOMP:
1544 * get offset for the last header in the chain. m will be kept untainted.
1547 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1557 newoff = ip6_nexthdr(m, off, proto, nxtp);
1560 else if (newoff < off)
1561 return -1; /* invalid */
1562 else if (newoff == off)
1571 ip6_addaux(struct mbuf *m)
1573 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1575 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1576 sizeof (struct ip6aux),
1579 m_tag_prepend(m, tag);
1582 bzero(tag+1, sizeof (struct ip6aux));
1583 return tag ? (struct ip6aux*)(tag+1) : NULL;
1587 ip6_findaux(struct mbuf *m)
1589 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1590 return tag ? (struct ip6aux*)(tag+1) : NULL;
1594 ip6_delaux(struct mbuf *m)
1596 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1598 m_tag_delete(m, tag);
1602 * System control for IP6
1605 u_char inet6ctlerrmap[PRC_NCMDS] = {
1607 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1608 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1609 EMSGSIZE, EHOSTUNREACH, 0, 0,