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 1.14 2004/04/21 18:13:57 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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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;
224 * to route local address of p2p link to loopback,
225 * assign loopback address first.
227 in6_ifattach(&loif[0], NULL);
230 callout_init(&nd6_timer_ch);
231 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
233 /* router renumbering prefix list maintenance */
234 callout_init(&in6_rr_timer_ch);
235 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
237 /* timer for regeneranation of temporary addresses randomize ID */
238 callout_reset(&in6_tmpaddrtimer_ch,
239 (ip6_temp_preferred_lifetime - ip6_desync_factor -
240 ip6_temp_regen_advance) * hz,
241 in6_tmpaddrtimer, NULL);
245 /* This must be after route_init(), which is now SI_ORDER_THIRD */
246 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
248 extern struct route_in6 ip6_forward_rt;
252 ip6_input(struct netmsg *msg)
254 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
256 int off = sizeof(struct ip6_hdr), nest;
258 u_int32_t rtalert = ~0;
260 struct ifnet *deliverifp = NULL;
262 struct in6_addr odst;
268 * should the inner packet be considered authentic?
269 * see comment in ah4_input().
272 m->m_flags &= ~M_AUTHIPHDR;
273 m->m_flags &= ~M_AUTHIPDGM;
278 * make sure we don't have onion peering information into m_aux.
285 if (m->m_flags & M_EXT) {
287 ip6stat.ip6s_mext2m++;
289 ip6stat.ip6s_mext1++;
291 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
293 if (m->m_flags & M_LOOP) {
294 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
295 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
296 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
298 ip6stat.ip6s_m2m[0]++;
304 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
305 ip6stat.ip6s_total++;
307 #ifndef PULLDOWN_TEST
309 * L2 bridge code and some other code can return mbuf chain
310 * that does not conform to KAME requirement. too bad.
311 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
313 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
316 MGETHDR(n, M_DONTWAIT, MT_HEADER);
319 if (n && n->m_pkthdr.len > MHLEN) {
320 MCLGET(n, M_DONTWAIT);
321 if ((n->m_flags & M_EXT) == 0) {
329 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
330 n->m_len = n->m_pkthdr.len;
334 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
337 if (m->m_len < sizeof(struct ip6_hdr)) {
339 inifp = m->m_pkthdr.rcvif;
340 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
341 ip6stat.ip6s_toosmall++;
342 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
347 ip6 = mtod(m, struct ip6_hdr *);
349 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
350 ip6stat.ip6s_badvers++;
351 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
357 * Run through list of hooks for input packets.
359 * NB: Beware of the destination address changing
360 * (e.g. by NAT rewriting). When this happens,
361 * tell ip6_forward to do the right thing.
364 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, PFIL_IN))
366 if (m == NULL) /* consumed by filter */
368 ip6 = mtod(m, struct ip6_hdr *);
369 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
370 #endif /* PFIL_HOOKS */
372 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
375 * Check with the firewall...
377 if (ip6_fw_enable && ip6_fw_chk_ptr) {
379 /* If ipfw says divert, we have to just drop packet */
380 /* use port as a dummy argument */
381 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
390 * Check against address spoofing/corruption.
392 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
393 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
395 * XXX: "badscope" is not very suitable for a multicast source.
397 ip6stat.ip6s_badscope++;
398 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
401 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
402 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
403 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
404 ip6stat.ip6s_badscope++;
405 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
410 * The following check is not documented in specs. A malicious
411 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
412 * and bypass security checks (act as if it was from 127.0.0.1 by using
413 * IPv6 src ::ffff:127.0.0.1). Be cautious.
415 * This check chokes if we are in an SIIT cloud. As none of BSDs
416 * support IPv4-less kernel compilation, we cannot support SIIT
417 * environment at all. So, it makes more sense for us to reject any
418 * malicious packets for non-SIIT environment, than try to do a
419 * partical support for SIIT environment.
421 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
422 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
423 ip6stat.ip6s_badscope++;
424 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
429 * Reject packets with IPv4 compatible addresses (auto tunnel).
431 * The code forbids auto tunnel relay case in RFC1933 (the check is
432 * stronger than RFC1933). We may want to re-enable it if mech-xx
433 * is revised to forbid relaying case.
435 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
436 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
437 ip6stat.ip6s_badscope++;
438 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
443 /* drop packets if interface ID portion is already filled */
444 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
445 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
446 ip6->ip6_src.s6_addr16[1]) {
447 ip6stat.ip6s_badscope++;
450 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
451 ip6->ip6_dst.s6_addr16[1]) {
452 ip6stat.ip6s_badscope++;
457 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
458 ip6->ip6_src.s6_addr16[1]
459 = htons(m->m_pkthdr.rcvif->if_index);
460 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
461 ip6->ip6_dst.s6_addr16[1]
462 = htons(m->m_pkthdr.rcvif->if_index);
464 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
466 * We use rt->rt_ifp to determine if the address is ours or not.
467 * If rt_ifp is lo0, the address is ours.
468 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
469 * so any address under fe80::%lo0/64 will be mistakenly considered
470 * local. The special case is supplied to handle the case properly
471 * by actually looking at interface addresses
472 * (using in6ifa_ifpwithaddr).
474 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
475 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
476 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
477 icmp6_error(m, ICMP6_DST_UNREACH,
478 ICMP6_DST_UNREACH_ADDR, 0);
479 /* m is already freed */
484 deliverifp = m->m_pkthdr.rcvif;
492 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
493 struct in6_multi *in6m = 0;
495 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
497 * See if we belong to the destination multicast group on the
500 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
503 else if (!ip6_mrouter) {
504 ip6stat.ip6s_notmember++;
505 ip6stat.ip6s_cantforward++;
506 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
509 deliverifp = m->m_pkthdr.rcvif;
516 switch (ip6_ours_check_algorithm) {
519 * XXX: I intentionally broke our indentation rule here,
520 * since this switch-case is just for measurement and
521 * therefore should soon be removed.
523 if (ip6_forward_rt.ro_rt != NULL &&
524 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
525 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
526 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
527 ip6stat.ip6s_forward_cachehit++;
529 struct sockaddr_in6 *dst6;
531 if (ip6_forward_rt.ro_rt) {
532 /* route is down or destination is different */
533 ip6stat.ip6s_forward_cachemiss++;
534 RTFREE(ip6_forward_rt.ro_rt);
535 ip6_forward_rt.ro_rt = 0;
538 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
539 dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
540 dst6->sin6_len = sizeof(struct sockaddr_in6);
541 dst6->sin6_family = AF_INET6;
542 dst6->sin6_addr = ip6->ip6_dst;
544 ip6_forward_rt.ro_dst.sin6_scope_id =
545 in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_dst);
548 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
551 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
554 * Accept the packet if the forwarding interface to the destination
555 * according to the routing table is the loopback interface,
556 * unless the associated route has a gateway.
557 * Note that this approach causes to accept a packet if there is a
558 * route to the loopback interface for the destination of the packet.
559 * But we think it's even useful in some situations, e.g. when using
560 * a special daemon which wants to intercept the packet.
562 * XXX: some OSes automatically make a cloned route for the destination
563 * of an outgoing packet. If the outgoing interface of the packet
564 * is a loopback one, the kernel would consider the packet to be
565 * accepted, even if we have no such address assinged on the interface.
566 * We check the cloned flag of the route entry to reject such cases,
567 * assuming that route entries for our own addresses are not made by
568 * cloning (it should be true because in6_addloop explicitly installs
569 * the host route). However, we might have to do an explicit check
570 * while it would be less efficient. Or, should we rather install a
571 * reject route for such a case?
573 if (ip6_forward_rt.ro_rt &&
574 (ip6_forward_rt.ro_rt->rt_flags &
575 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
577 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
580 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
584 * The check below is redundant since the comparison of
585 * the destination and the key of the rtentry has
586 * already done through looking up the routing table.
588 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
589 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
591 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
592 struct in6_ifaddr *ia6 =
593 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
596 * record address information into m_aux.
598 (void)ip6_setdstifaddr(m, ia6);
601 * packets to a tentative, duplicated, or somehow invalid
602 * address must not be accepted.
604 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
605 /* this address is ready */
607 deliverifp = ia6->ia_ifp; /* correct? */
608 /* Count the packet in the ip address stats */
609 ia6->ia_ifa.if_ipackets++;
610 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
613 /* address is not ready, so discard the packet. */
615 "ip6_input: packet to an unready address %s->%s\n",
616 ip6_sprintf(&ip6->ip6_src),
617 ip6_sprintf(&ip6->ip6_dst)));
622 } /* XXX indentation (see above) */
625 * FAITH(Firewall Aided Internet Translator)
628 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
629 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
630 /* XXX do we need more sanity checks? */
632 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
638 * Now there is no reason to process the packet if it's not our own
639 * and we're not a router.
641 if (!ip6_forwarding) {
642 ip6stat.ip6s_cantforward++;
643 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
649 * record address information into m_aux, if we don't have one yet.
650 * note that we are unable to record it, if the address is not listed
651 * as our interface address (e.g. multicast addresses, addresses
652 * within FAITH prefixes and such).
654 if (deliverifp && !ip6_getdstifaddr(m)) {
655 struct in6_ifaddr *ia6;
657 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
659 if (!ip6_setdstifaddr(m, ia6)) {
661 * XXX maybe we should drop the packet here,
662 * as we could not provide enough information
663 * to the upper layers.
670 * Process Hop-by-Hop options header if it's contained.
671 * m may be modified in ip6_hopopts_input().
672 * If a JumboPayload option is included, plen will also be modified.
674 plen = (u_int32_t)ntohs(ip6->ip6_plen);
675 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
678 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
679 #if 0 /*touches NULL pointer*/
680 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
682 goto bad2; /* m have already been freed */
686 ip6 = mtod(m, struct ip6_hdr *);
689 * if the payload length field is 0 and the next header field
690 * indicates Hop-by-Hop Options header, then a Jumbo Payload
691 * option MUST be included.
693 if (ip6->ip6_plen == 0 && plen == 0) {
695 * Note that if a valid jumbo payload option is
696 * contained, ip6_hoptops_input() must set a valid
697 * (non-zero) payload length to the variable plen.
699 ip6stat.ip6s_badoptions++;
700 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
701 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
702 icmp6_error(m, ICMP6_PARAM_PROB,
703 ICMP6_PARAMPROB_HEADER,
704 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
707 #ifndef PULLDOWN_TEST
708 /* ip6_hopopts_input() ensures that mbuf is contiguous */
709 hbh = (struct ip6_hbh *)(ip6 + 1);
711 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
712 sizeof(struct ip6_hbh));
714 ip6stat.ip6s_tooshort++;
721 * accept the packet if a router alert option is included
722 * and we act as an IPv6 router.
724 if (rtalert != ~0 && ip6_forwarding)
730 * Check that the amount of data in the buffers
731 * is as at least much as the IPv6 header would have us expect.
732 * Trim mbufs if longer than we expect.
733 * Drop packet if shorter than we expect.
735 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
736 ip6stat.ip6s_tooshort++;
737 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
740 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
741 if (m->m_len == m->m_pkthdr.len) {
742 m->m_len = sizeof(struct ip6_hdr) + plen;
743 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
745 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
749 * Forward if desirable.
751 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
753 * If we are acting as a multicast router, all
754 * incoming multicast packets are passed to the
755 * kernel-level multicast forwarding function.
756 * The packet is returned (relatively) intact; if
757 * ip6_mforward() returns a non-zero value, the packet
758 * must be discarded, else it may be accepted below.
760 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
761 ip6stat.ip6s_cantforward++;
767 ip6_forward(m, srcrt);
771 ip6 = mtod(m, struct ip6_hdr *);
774 * Malicious party may be able to use IPv4 mapped addr to confuse
775 * tcp/udp stack and bypass security checks (act as if it was from
776 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
778 * For SIIT end node behavior, you may want to disable the check.
779 * However, you will become vulnerable to attacks using IPv4 mapped
782 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
783 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
784 ip6stat.ip6s_badscope++;
785 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
790 * Tell launch routine the next header
792 ip6stat.ip6s_delivered++;
793 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
796 while (nxt != IPPROTO_DONE) {
797 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
798 ip6stat.ip6s_toomanyhdr++;
803 * protection against faulty packet - there should be
804 * more sanity checks in header chain processing.
806 if (m->m_pkthdr.len < off) {
807 ip6stat.ip6s_tooshort++;
808 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
814 * do we need to do it for every header? yeah, other
815 * functions can play with it (like re-allocate and copy).
817 mhist = ip6_addaux(m);
818 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
819 hist = mtod(mhist, caddr_t) + mhist->m_len;
820 bcopy(&nxt, hist, sizeof(nxt));
821 mhist->m_len += sizeof(nxt);
823 ip6stat.ip6s_toomanyhdr++;
830 * enforce IPsec policy checking if we are seeing last header.
831 * note that we do not visit this with protocols with pcb layer
832 * code - like udp/tcp/raw ip.
834 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
835 ipsec6_in_reject(m, NULL)) {
836 ipsec6stat.in_polvio++;
841 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
847 lwkt_replymsg(&msg->nm_lmsg, 0);
852 * set/grab in6_ifaddr correspond to IPv6 destination address.
853 * XXX backward compatibility wrapper
855 static struct ip6aux *
856 ip6_setdstifaddr(m, ia6)
858 struct in6_ifaddr *ia6;
864 n->ip6a_dstia6 = ia6;
865 return n; /* NULL if failed to set */
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(plenp, rtalertp, mp, offp)
888 u_int32_t *rtalertp; /* XXX: should be stored more smart way */
892 struct mbuf *m = *mp;
893 int off = *offp, hbhlen;
897 /* validation of the length of the header */
898 #ifndef PULLDOWN_TEST
899 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
900 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
901 hbhlen = (hbh->ip6h_len + 1) << 3;
903 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
904 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
906 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
907 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
909 ip6stat.ip6s_tooshort++;
912 hbhlen = (hbh->ip6h_len + 1) << 3;
913 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
916 ip6stat.ip6s_tooshort++;
921 hbhlen -= sizeof(struct ip6_hbh);
922 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
924 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
925 hbhlen, rtalertp, plenp) < 0)
934 * Search header for all Hop-by-hop options and process each option.
935 * This function is separate from ip6_hopopts_input() in order to
936 * handle a case where the sending node itself process its hop-by-hop
937 * options header. In such a case, the function is called from ip6_output().
939 * The function assumes that hbh header is located right after the IPv6 header
940 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
941 * opthead + hbhlen is located in continuous memory region.
944 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
953 u_int8_t *opt = opthead;
954 u_int16_t rtalert_val;
956 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
958 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
964 if (hbhlen < IP6OPT_MINLEN) {
965 ip6stat.ip6s_toosmall++;
968 optlen = *(opt + 1) + 2;
971 /* XXX may need check for alignment */
972 if (hbhlen < IP6OPT_RTALERT_LEN) {
973 ip6stat.ip6s_toosmall++;
976 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
978 icmp6_error(m, ICMP6_PARAM_PROB,
979 ICMP6_PARAMPROB_HEADER,
980 erroff + opt + 1 - opthead);
983 optlen = IP6OPT_RTALERT_LEN;
984 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
985 *rtalertp = ntohs(rtalert_val);
988 /* XXX may need check for alignment */
989 if (hbhlen < IP6OPT_JUMBO_LEN) {
990 ip6stat.ip6s_toosmall++;
993 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
995 icmp6_error(m, ICMP6_PARAM_PROB,
996 ICMP6_PARAMPROB_HEADER,
997 erroff + opt + 1 - opthead);
1000 optlen = IP6OPT_JUMBO_LEN;
1003 * IPv6 packets that have non 0 payload length
1004 * must not contain a jumbo payload option.
1006 ip6 = mtod(m, struct ip6_hdr *);
1007 if (ip6->ip6_plen) {
1008 ip6stat.ip6s_badoptions++;
1009 icmp6_error(m, ICMP6_PARAM_PROB,
1010 ICMP6_PARAMPROB_HEADER,
1011 erroff + opt - opthead);
1016 * We may see jumbolen in unaligned location, so
1017 * we'd need to perform bcopy().
1019 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1020 jumboplen = (u_int32_t)htonl(jumboplen);
1024 * if there are multiple jumbo payload options,
1025 * *plenp will be non-zero and the packet will be
1027 * the behavior may need some debate in ipngwg -
1028 * multiple options does not make sense, however,
1029 * there's no explicit mention in specification.
1032 ip6stat.ip6s_badoptions++;
1033 icmp6_error(m, ICMP6_PARAM_PROB,
1034 ICMP6_PARAMPROB_HEADER,
1035 erroff + opt + 2 - opthead);
1041 * jumbo payload length must be larger than 65535.
1043 if (jumboplen <= IPV6_MAXPACKET) {
1044 ip6stat.ip6s_badoptions++;
1045 icmp6_error(m, ICMP6_PARAM_PROB,
1046 ICMP6_PARAMPROB_HEADER,
1047 erroff + opt + 2 - opthead);
1053 default: /* unknown option */
1054 if (hbhlen < IP6OPT_MINLEN) {
1055 ip6stat.ip6s_toosmall++;
1058 optlen = ip6_unknown_opt(opt, m,
1059 erroff + opt - opthead);
1075 * Unknown option processing.
1076 * The third argument `off' is the offset from the IPv6 header to the option,
1077 * which is necessary if the IPv6 header the and option header and IPv6 header
1078 * is not continuous in order to return an ICMPv6 error.
1081 ip6_unknown_opt(optp, m, off)
1086 struct ip6_hdr *ip6;
1088 switch (IP6OPT_TYPE(*optp)) {
1089 case IP6OPT_TYPE_SKIP: /* ignore the option */
1090 return((int)*(optp + 1));
1091 case IP6OPT_TYPE_DISCARD: /* silently discard */
1094 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1095 ip6stat.ip6s_badoptions++;
1096 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1098 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1099 ip6stat.ip6s_badoptions++;
1100 ip6 = mtod(m, struct ip6_hdr *);
1101 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1102 (m->m_flags & (M_BCAST|M_MCAST)))
1105 icmp6_error(m, ICMP6_PARAM_PROB,
1106 ICMP6_PARAMPROB_OPTION, off);
1110 m_freem(m); /* XXX: NOTREACHED */
1115 * Create the "control" list for this pcb.
1116 * The function will not modify mbuf chain at all.
1118 * with KAME mbuf chain restriction:
1119 * The routine will be called from upper layer handlers like tcp6_input().
1120 * Thus the routine assumes that the caller (tcp6_input) have already
1121 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1122 * very first mbuf on the mbuf chain.
1125 ip6_savecontrol(in6p, mp, ip6, m)
1128 struct ip6_hdr *ip6;
1131 struct thread *td = curthread; /* XXX */
1133 int rthdr_exist = 0;
1140 if ((in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0) {
1144 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1145 SCM_TIMESTAMP, SOL_SOCKET);
1147 mp = &(*mp)->m_next;
1152 /* RFC 2292 sec. 5 */
1153 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1154 struct in6_pktinfo pi6;
1155 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1156 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1157 pi6.ipi6_addr.s6_addr16[1] = 0;
1158 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1159 ? m->m_pkthdr.rcvif->if_index
1161 *mp = sbcreatecontrol((caddr_t) &pi6,
1162 sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1165 mp = &(*mp)->m_next;
1168 if ((in6p->in6p_flags & IN6P_HOPLIMIT) != 0) {
1169 int hlim = ip6->ip6_hlim & 0xff;
1170 *mp = sbcreatecontrol((caddr_t) &hlim,
1171 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1173 mp = &(*mp)->m_next;
1177 * IPV6_HOPOPTS socket option. We require super-user privilege
1178 * for the option, but it might be too strict, since there might
1179 * be some hop-by-hop options which can be returned to normal user.
1180 * See RFC 2292 section 6.
1182 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
1184 * Check if a hop-by-hop options header is contatined in the
1185 * received packet, and if so, store the options as ancillary
1186 * data. Note that a hop-by-hop options header must be
1187 * just after the IPv6 header, which fact is assured through
1188 * the IPv6 input processing.
1190 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1191 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1192 struct ip6_hbh *hbh;
1194 #ifdef PULLDOWN_TEST
1198 #ifndef PULLDOWN_TEST
1199 hbh = (struct ip6_hbh *)(ip6 + 1);
1200 hbhlen = (hbh->ip6h_len + 1) << 3;
1202 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1205 ip6stat.ip6s_tooshort++;
1208 hbh = mtod(ext, struct ip6_hbh *);
1209 hbhlen = (hbh->ip6h_len + 1) << 3;
1210 if (hbhlen != ext->m_len) {
1212 ip6stat.ip6s_tooshort++;
1218 * XXX: We copy whole the header even if a jumbo
1219 * payload option is included, which option is to
1220 * be removed before returning in the RFC 2292.
1221 * Note: this constraint is removed in 2292bis.
1223 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1224 IPV6_HOPOPTS, IPPROTO_IPV6);
1226 mp = &(*mp)->m_next;
1227 #ifdef PULLDOWN_TEST
1233 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1234 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1235 int proto, off, nxt;
1238 * go through the header chain to see if a routing header is
1239 * contained in the packet. We need this information to store
1240 * destination options headers (if any) properly.
1241 * XXX: performance issue. We should record this info when
1242 * processing extension headers in incoming routine.
1245 proto = IPPROTO_IPV6;
1251 newoff = ip6_nexthdr(m, off, proto, &nxt);
1254 if (newoff < off) /* invalid, check for safety */
1256 if ((proto = nxt) == IPPROTO_ROUTING) {
1264 if ((in6p->in6p_flags &
1265 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1266 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1267 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1270 * Search for destination options headers or routing
1271 * header(s) through the header chain, and stores each
1272 * header as ancillary data.
1273 * Note that the order of the headers remains in
1274 * the chain of ancillary data.
1276 while (1) { /* is explicit loop prevention necessary? */
1277 struct ip6_ext *ip6e = NULL;
1279 #ifdef PULLDOWN_TEST
1280 struct mbuf *ext = NULL;
1284 * if it is not an extension header, don't try to
1285 * pull it from the chain.
1288 case IPPROTO_DSTOPTS:
1289 case IPPROTO_ROUTING:
1290 case IPPROTO_HOPOPTS:
1291 case IPPROTO_AH: /* is it possible? */
1297 #ifndef PULLDOWN_TEST
1298 if (off + sizeof(*ip6e) > m->m_len)
1300 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1301 if (nxt == IPPROTO_AH)
1302 elen = (ip6e->ip6e_len + 2) << 2;
1304 elen = (ip6e->ip6e_len + 1) << 3;
1305 if (off + elen > m->m_len)
1308 ext = ip6_pullexthdr(m, off, nxt);
1310 ip6stat.ip6s_tooshort++;
1313 ip6e = mtod(ext, struct ip6_ext *);
1314 if (nxt == IPPROTO_AH)
1315 elen = (ip6e->ip6e_len + 2) << 2;
1317 elen = (ip6e->ip6e_len + 1) << 3;
1318 if (elen != ext->m_len) {
1320 ip6stat.ip6s_tooshort++;
1326 case IPPROTO_DSTOPTS:
1327 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1331 * We also require super-user privilege for
1333 * See the comments on IN6_HOPOPTS.
1338 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1342 mp = &(*mp)->m_next;
1344 case IPPROTO_ROUTING:
1345 if (!in6p->in6p_flags & IN6P_RTHDR)
1348 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1352 mp = &(*mp)->m_next;
1354 case IPPROTO_HOPOPTS:
1355 case IPPROTO_AH: /* is it possible? */
1360 * other cases have been filtered in the above.
1361 * none will visit this case. here we supply
1362 * the code just in case (nxt overwritten or
1365 #ifdef PULLDOWN_TEST
1372 /* proceed with the next header. */
1374 nxt = ip6e->ip6e_nxt;
1376 #ifdef PULLDOWN_TEST
1387 #ifdef PULLDOWN_TEST
1389 * pull single extension header from mbuf chain. returns single mbuf that
1390 * contains the result, or NULL on error.
1392 static struct mbuf *
1393 ip6_pullexthdr(m, off, nxt)
1398 struct ip6_ext ip6e;
1404 case IPPROTO_DSTOPTS:
1405 case IPPROTO_ROUTING:
1406 case IPPROTO_HOPOPTS:
1407 case IPPROTO_AH: /* is it possible? */
1410 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1414 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1415 if (nxt == IPPROTO_AH)
1416 elen = (ip6e.ip6e_len + 2) << 2;
1418 elen = (ip6e.ip6e_len + 1) << 3;
1420 MGET(n, M_DONTWAIT, MT_DATA);
1421 if (n && elen >= MLEN) {
1422 MCLGET(n, M_DONTWAIT);
1423 if ((n->m_flags & M_EXT) == 0) {
1432 if (elen >= M_TRAILINGSPACE(n)) {
1437 m_copydata(m, off, elen, mtod(n, caddr_t));
1444 * Get pointer to the previous header followed by the header
1445 * currently processed.
1446 * XXX: This function supposes that
1447 * M includes all headers,
1448 * the next header field and the header length field of each header
1450 * the sum of each header length equals to OFF.
1451 * Because of these assumptions, this function must be called very
1452 * carefully. Moreover, it will not be used in the near future when
1453 * we develop `neater' mechanism to process extension headers.
1456 ip6_get_prevhdr(m, off)
1460 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1462 if (off == sizeof(struct ip6_hdr))
1463 return(&ip6->ip6_nxt);
1466 struct ip6_ext *ip6e = NULL;
1469 len = sizeof(struct ip6_hdr);
1471 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1474 case IPPROTO_FRAGMENT:
1475 len += sizeof(struct ip6_frag);
1478 len += (ip6e->ip6e_len + 2) << 2;
1481 len += (ip6e->ip6e_len + 1) << 3;
1484 nxt = ip6e->ip6e_nxt;
1487 return(&ip6e->ip6e_nxt);
1494 * get next header offset. m will be retained.
1497 ip6_nexthdr(m, off, proto, nxtp)
1504 struct ip6_ext ip6e;
1509 panic("ip6_nexthdr: m == NULL");
1510 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1515 if (m->m_pkthdr.len < off + sizeof(ip6))
1517 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1519 *nxtp = ip6.ip6_nxt;
1523 case IPPROTO_FRAGMENT:
1525 * terminate parsing if it is not the first fragment,
1526 * it does not make sense to parse through it.
1528 if (m->m_pkthdr.len < off + sizeof(fh))
1530 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1531 if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
1534 *nxtp = fh.ip6f_nxt;
1535 off += sizeof(struct ip6_frag);
1539 if (m->m_pkthdr.len < off + sizeof(ip6e))
1541 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1543 *nxtp = ip6e.ip6e_nxt;
1544 off += (ip6e.ip6e_len + 2) << 2;
1547 case IPPROTO_HOPOPTS:
1548 case IPPROTO_ROUTING:
1549 case IPPROTO_DSTOPTS:
1550 if (m->m_pkthdr.len < off + sizeof(ip6e))
1552 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1554 *nxtp = ip6e.ip6e_nxt;
1555 off += (ip6e.ip6e_len + 1) << 3;
1560 case IPPROTO_IPCOMP:
1572 * get offset for the last header in the chain. m will be kept untainted.
1575 ip6_lasthdr(m, off, proto, nxtp)
1589 newoff = ip6_nexthdr(m, off, proto, nxtp);
1592 else if (newoff < off)
1593 return -1; /* invalid */
1594 else if (newoff == off)
1606 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1608 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1609 sizeof (struct ip6aux),
1612 m_tag_prepend(m, tag);
1615 bzero(tag+1, sizeof (struct ip6aux));
1616 return tag ? (struct ip6aux*)(tag+1) : NULL;
1623 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1624 return tag ? (struct ip6aux*)(tag+1) : NULL;
1631 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1633 m_tag_delete(m, tag);
1637 * System control for IP6
1640 u_char inet6ctlerrmap[PRC_NCMDS] = {
1642 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1643 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1644 EMSGSIZE, EHOSTUNREACH, 0, 0,