1 /* $FreeBSD: src/sys/netinet6/ip6_input.c,v 1.11.2.15 2003/01/24 05:11:35 sam Exp $ */
2 /* $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ */
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61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
64 #include "opt_ip6fw.h"
66 #include "opt_inet6.h"
67 #include "opt_ipsec.h"
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/malloc.h>
73 #include <sys/domain.h>
74 #include <sys/protosw.h>
75 #include <sys/socket.h>
76 #include <sys/socketvar.h>
77 #include <sys/errno.h>
79 #include <sys/kernel.h>
80 #include <sys/syslog.h>
85 #include <net/if_types.h>
86 #include <net/if_dl.h>
87 #include <net/route.h>
88 #include <net/netisr.h>
91 #include <sys/thread2.h>
92 #include <sys/msgport2.h>
93 #include <net/netmsg2.h>
94 #include <net/netisr2.h>
96 #include <netinet/in.h>
97 #include <netinet/in_systm.h>
99 #include <netinet/ip.h>
100 #include <netinet/ip_icmp.h>
102 #include <netinet/ip6.h>
103 #include <netinet6/in6_var.h>
104 #include <netinet6/ip6_var.h>
105 #include <netinet/in_pcb.h>
106 #include <netinet/icmp6.h>
107 #include <netinet6/scope6_var.h>
108 #include <netinet6/in6_ifattach.h>
109 #include <netinet6/nd6.h>
112 #include <netinet6/ipsec.h>
114 #include <netinet6/ipsec6.h>
119 #include <netproto/ipsec/ipsec.h>
120 #include <netproto/ipsec/ipsec6.h>
122 #endif /* FAST_IPSEC */
124 #include <net/ip6fw/ip6_fw.h>
126 #include <netinet6/ip6protosw.h>
128 #include <net/net_osdep.h>
130 extern struct domain inet6domain;
131 extern struct protosw inet6sw[];
133 u_char ip6_protox[IPPROTO_MAX];
134 struct in6_ifaddr *in6_ifaddr;
136 int ip6_forward_srcrt; /* XXX */
137 int ip6_sourcecheck; /* XXX */
138 int ip6_sourcecheck_interval; /* XXX */
140 int ip6_ours_check_algorithm;
142 struct pfil_head inet6_pfil_hook;
145 ip6_fw_chk_t *ip6_fw_chk_ptr;
146 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
147 int ip6_fw_enable = 1;
149 struct ip6stat ip6stat;
151 static void ip6_init2 (void *);
152 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
153 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
154 static void ip6_input(netmsg_t msg);
156 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
158 static void transport6_processing_handler(netmsg_t netmsg);
161 * IP6 initialization: fill in IP6 protocol switch table.
162 * All protocols not implemented in kernel go to raw IP6 protocol handler.
171 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
174 for (i = 0; i < IPPROTO_MAX; i++)
175 ip6_protox[i] = pr - inet6sw;
176 for (pr = inet6domain.dom_protosw;
177 pr < inet6domain.dom_protoswNPROTOSW; pr++)
178 if (pr->pr_domain->dom_family == PF_INET6 &&
179 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
180 ip6_protox[pr->pr_protocol] = pr - inet6sw;
182 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
183 inet6_pfil_hook.ph_af = AF_INET6;
184 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
185 kprintf("%s: WARNING: unable to register pfil hook, "
186 "error %d\n", __func__, i);
189 netisr_register(NETISR_IPV6, ip6_input, NULL); /* XXX hashfn */
191 addrsel_policy_init();
195 * in many cases, random() here does NOT return random number
196 * as initialization during bootstrap time occur in fixed order.
199 ip6_flow_seq = krandom() ^ tv.tv_usec;
201 ip6_desync_factor = (krandom() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
205 ip6_init2(void *dummy)
208 in6_tmpaddrtimer_init();
212 /* This must be after route_init(), which is now SI_ORDER_THIRD */
213 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
215 extern struct route_in6 ip6_forward_rt;
219 ip6_input(netmsg_t msg)
221 struct mbuf *m = msg->packet.nm_packet;
223 int off = sizeof(struct ip6_hdr), nest;
225 u_int32_t rtalert = ~0;
226 int nxt, ours = 0, rh_present = 0;
227 struct ifnet *deliverifp = NULL;
228 struct in6_addr odst;
233 * should the inner packet be considered authentic?
234 * see comment in ah4_input().
237 m->m_flags &= ~M_AUTHIPHDR;
238 m->m_flags &= ~M_AUTHIPDGM;
243 * make sure we don't have onion peering information into m_aux.
250 if (m->m_flags & M_EXT) {
252 ip6stat.ip6s_mext2m++;
254 ip6stat.ip6s_mext1++;
256 #define M2MMAX NELEM(ip6stat.ip6s_m2m)
258 if (m->m_flags & M_LOOP) {
259 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
260 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
261 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
263 ip6stat.ip6s_m2m[0]++;
269 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
270 ip6stat.ip6s_total++;
272 #ifndef PULLDOWN_TEST
274 * L2 bridge code and some other code can return mbuf chain
275 * that does not conform to KAME requirement. too bad.
276 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
278 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
281 n = m_getb(m->m_pkthdr.len, M_NOWAIT, MT_HEADER, M_PKTHDR);
286 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
287 n->m_len = n->m_pkthdr.len;
291 IP6_EXTHDR_CHECK_VOIDRET(m, 0, sizeof(struct ip6_hdr));
294 if (m->m_len < sizeof(struct ip6_hdr)) {
296 inifp = m->m_pkthdr.rcvif;
297 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
298 ip6stat.ip6s_toosmall++;
299 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
304 ip6 = mtod(m, struct ip6_hdr *);
306 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
307 ip6stat.ip6s_badvers++;
308 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
313 * Run through list of hooks for input packets.
315 * NB: Beware of the destination address changing
316 * (e.g. by NAT rewriting). When this happens,
317 * tell ip6_forward to do the right thing.
319 if (pfil_has_hooks(&inet6_pfil_hook)) {
321 if (pfil_run_hooks(&inet6_pfil_hook, &m,
322 m->m_pkthdr.rcvif, PFIL_IN)) {
325 if (m == NULL) /* consumed by filter */
327 ip6 = mtod(m, struct ip6_hdr *);
328 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
331 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
334 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
335 /* packet is dropped by traffic conditioner */
341 * Check with the firewall...
343 if (ip6_fw_enable && ip6_fw_chk_ptr) {
345 /* If ipfw says divert, we have to just drop packet */
346 /* use port as a dummy argument */
347 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
356 * Check against address spoofing/corruption.
358 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
359 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
361 * XXX: "badscope" is not very suitable for a multicast source.
363 ip6stat.ip6s_badscope++;
364 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
367 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
368 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
369 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
370 ip6stat.ip6s_badscope++;
371 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
376 * The following check is not documented in specs. A malicious
377 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
378 * and bypass security checks (act as if it was from 127.0.0.1 by using
379 * IPv6 src ::ffff:127.0.0.1). Be cautious.
381 * This check chokes if we are in an SIIT cloud. As none of BSDs
382 * support IPv4-less kernel compilation, we cannot support SIIT
383 * environment at all. So, it makes more sense for us to reject any
384 * malicious packets for non-SIIT environment, than try to do a
385 * partical support for SIIT environment.
387 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
388 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
389 ip6stat.ip6s_badscope++;
390 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
395 * Reject packets with IPv4 compatible addresses (auto tunnel).
397 * The code forbids auto tunnel relay case in RFC1933 (the check is
398 * stronger than RFC1933). We may want to re-enable it if mech-xx
399 * is revised to forbid relaying case.
401 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
402 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
403 ip6stat.ip6s_badscope++;
404 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
409 /* drop packets if interface ID portion is already filled */
410 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
411 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
412 ip6->ip6_src.s6_addr16[1]) {
413 ip6stat.ip6s_badscope++;
416 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
417 ip6->ip6_dst.s6_addr16[1]) {
418 ip6stat.ip6s_badscope++;
423 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
424 ip6->ip6_src.s6_addr16[1]
425 = htons(m->m_pkthdr.rcvif->if_index);
426 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
427 ip6->ip6_dst.s6_addr16[1]
428 = htons(m->m_pkthdr.rcvif->if_index);
430 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
432 * We use rt->rt_ifp to determine if the address is ours or not.
433 * If rt_ifp is lo0, the address is ours.
434 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
435 * so any address under fe80::%lo0/64 will be mistakenly considered
436 * local. The special case is supplied to handle the case properly
437 * by actually looking at interface addresses
438 * (using in6ifa_ifpwithaddr).
440 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
441 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
442 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
443 icmp6_error(m, ICMP6_DST_UNREACH,
444 ICMP6_DST_UNREACH_ADDR, 0);
445 /* m is already freed */
450 deliverifp = m->m_pkthdr.rcvif;
458 * WARNING! For general subnet proxying the interface hw will
459 * likely filter out the multicast solicitations, so
460 * the interface must be in promiscuous mode.
462 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
464 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
465 deliverifp = m->m_pkthdr.rcvif;
472 switch (ip6_ours_check_algorithm) {
475 * XXX: I intentionally broke our indentation rule here,
476 * since this switch-case is just for measurement and
477 * therefore should soon be removed.
479 if (ip6_forward_rt.ro_rt != NULL &&
480 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
481 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
482 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
483 ip6stat.ip6s_forward_cachehit++;
485 struct sockaddr_in6 *dst6;
487 if (ip6_forward_rt.ro_rt) {
488 /* route is down or destination is different */
489 ip6stat.ip6s_forward_cachemiss++;
490 RTFREE(ip6_forward_rt.ro_rt);
491 ip6_forward_rt.ro_rt = 0;
494 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
495 dst6 = &ip6_forward_rt.ro_dst;
496 dst6->sin6_len = sizeof(struct sockaddr_in6);
497 dst6->sin6_family = AF_INET6;
498 dst6->sin6_addr = ip6->ip6_dst;
500 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
503 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
506 * Accept the packet if the forwarding interface to the destination
507 * according to the routing table is the loopback interface,
508 * unless the associated route has a gateway.
509 * Note that this approach causes to accept a packet if there is a
510 * route to the loopback interface for the destination of the packet.
511 * But we think it's even useful in some situations, e.g. when using
512 * a special daemon which wants to intercept the packet.
514 * XXX: some OSes automatically make a cloned route for the destination
515 * of an outgoing packet. If the outgoing interface of the packet
516 * is a loopback one, the kernel would consider the packet to be
517 * accepted, even if we have no such address assinged on the interface.
518 * We check the cloned flag of the route entry to reject such cases,
519 * assuming that route entries for our own addresses are not made by
520 * cloning (it should be true because in6_addloop explicitly installs
521 * the host route). However, we might have to do an explicit check
522 * while it would be less efficient. Or, should we rather install a
523 * reject route for such a case?
525 if (ip6_forward_rt.ro_rt &&
526 (ip6_forward_rt.ro_rt->rt_flags &
527 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
529 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
532 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
536 * The check below is redundant since the comparison of
537 * the destination and the key of the rtentry has
538 * already done through looking up the routing table.
540 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
541 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
543 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
544 struct in6_ifaddr *ia6 =
545 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
548 * record address information into m_aux.
550 ip6_setdstifaddr(m, ia6);
553 * packets to a tentative, duplicated, or somehow invalid
554 * address must not be accepted.
556 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
557 /* this address is ready */
559 deliverifp = ia6->ia_ifp; /* correct? */
560 /* Count the packet in the ip address stats */
561 IFA_STAT_INC(&ia6->ia_ifa, ipackets, 1);
562 IFA_STAT_INC(&ia6->ia_ifa, ibytes, m->m_pkthdr.len);
565 /* address is not ready, so discard the packet. */
567 "ip6_input: packet to an unready address %s->%s\n",
568 ip6_sprintf(&ip6->ip6_src),
569 ip6_sprintf(&ip6->ip6_dst)));
574 } /* XXX indentation (see above) */
577 * FAITH(Firewall Aided Internet Translator)
580 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
581 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
582 /* XXX do we need more sanity checks? */
584 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
590 * Now there is no reason to process the packet if it's not our own
591 * and we're not a router.
593 if (!ip6_forwarding) {
594 ip6stat.ip6s_cantforward++;
595 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
601 * record address information into m_aux, if we don't have one yet.
602 * note that we are unable to record it, if the address is not listed
603 * as our interface address (e.g. multicast addresses, addresses
604 * within FAITH prefixes and such).
606 if (deliverifp && !ip6_getdstifaddr(m)) {
607 struct in6_ifaddr *ia6;
609 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
611 if (!ip6_setdstifaddr(m, ia6)) {
613 * XXX maybe we should drop the packet here,
614 * as we could not provide enough information
615 * to the upper layers.
622 * Process Hop-by-Hop options header if it's contained.
623 * m may be modified in ip6_hopopts_input().
624 * If a JumboPayload option is included, plen will also be modified.
626 plen = (u_int32_t)ntohs(ip6->ip6_plen);
627 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
630 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
631 #if 0 /*touches NULL pointer*/
632 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
634 goto bad2; /* m have already been freed */
638 ip6 = mtod(m, struct ip6_hdr *);
641 * if the payload length field is 0 and the next header field
642 * indicates Hop-by-Hop Options header, then a Jumbo Payload
643 * option MUST be included.
645 if (ip6->ip6_plen == 0 && plen == 0) {
647 * Note that if a valid jumbo payload option is
648 * contained, ip6_hoptops_input() must set a valid
649 * (non-zero) payload length to the variable plen.
651 ip6stat.ip6s_badoptions++;
652 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
653 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
654 icmp6_error(m, ICMP6_PARAM_PROB,
655 ICMP6_PARAMPROB_HEADER,
656 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
659 #ifndef PULLDOWN_TEST
660 /* ip6_hopopts_input() ensures that mbuf is contiguous */
661 hbh = (struct ip6_hbh *)(ip6 + 1);
663 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
664 sizeof(struct ip6_hbh));
666 ip6stat.ip6s_tooshort++;
673 * If we are acting as a router and the packet contains a
674 * router alert option, see if we know the option value.
675 * Currently, we only support the option value for MLD, in which
676 * case we should pass the packet to the multicast routing
679 if (rtalert != ~0 && ip6_forwarding) {
681 case IP6OPT_RTALERT_MLD:
686 * RFC2711 requires unrecognized values must be
696 * Check that the amount of data in the buffers
697 * is as at least much as the IPv6 header would have us expect.
698 * Trim mbufs if longer than we expect.
699 * Drop packet if shorter than we expect.
701 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
702 ip6stat.ip6s_tooshort++;
703 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
706 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
707 if (m->m_len == m->m_pkthdr.len) {
708 m->m_len = sizeof(struct ip6_hdr) + plen;
709 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
711 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
715 * Forward if desirable.
717 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
719 * If we are acting as a multicast router, all
720 * incoming multicast packets are passed to the
721 * kernel-level multicast forwarding function.
722 * The packet is returned (relatively) intact; if
723 * ip6_mforward() returns a non-zero value, the packet
724 * must be discarded, else it may be accepted below.
726 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
727 ip6stat.ip6s_cantforward++;
733 ip6_forward(m, srcrt);
737 ip6 = mtod(m, struct ip6_hdr *);
740 * Malicious party may be able to use IPv4 mapped addr to confuse
741 * tcp/udp stack and bypass security checks (act as if it was from
742 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
744 * For SIIT end node behavior, you may want to disable the check.
745 * However, you will become vulnerable to attacks using IPv4 mapped
748 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
749 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
750 ip6stat.ip6s_badscope++;
751 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
756 * Tell launch routine the next header
758 ip6stat.ip6s_delivered++;
759 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
763 while (nxt != IPPROTO_DONE) {
766 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
767 ip6stat.ip6s_toomanyhdr++;
768 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
773 * protection against faulty packet - there should be
774 * more sanity checks in header chain processing.
776 if (m->m_pkthdr.len < off) {
777 ip6stat.ip6s_tooshort++;
778 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
784 * do we need to do it for every header? yeah, other
785 * functions can play with it (like re-allocate and copy).
787 mhist = ip6_addaux(m);
788 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
789 hist = mtod(mhist, caddr_t) + mhist->m_len;
790 bcopy(&nxt, hist, sizeof(nxt));
791 mhist->m_len += sizeof(nxt);
793 ip6stat.ip6s_toomanyhdr++;
798 if (nxt == IPPROTO_ROUTING) {
800 in6_ifstat_inc(m->m_pkthdr.rcvif,
802 ip6stat.ip6s_badoptions++;
807 sw6 = &inet6sw[ip6_protox[nxt]];
810 * enforce IPsec policy checking if we are seeing last header.
811 * note that we do not visit this with protocols with pcb layer
812 * code - like udp/tcp/raw ip.
814 if ((sw6->pr_flags & PR_LASTHDR) && ipsec6_in_reject(m, NULL)) {
815 ipsec6stat.in_polvio++;
820 * If this is a terminal header forward to the port, otherwise
821 * process synchronously for more headers.
823 if (sw6->pr_flags & PR_LASTHDR) {
824 struct netmsg_packet *pmsg;
827 port = netisr_cpuport(0); /* XXX */
828 KKASSERT(port != NULL);
829 pmsg = &m->m_hdr.mh_netmsg;
830 netmsg_init(&pmsg->base, NULL,
831 &netisr_apanic_rport,
832 0, transport6_processing_handler);
835 pmsg->base.lmsg.u.ms_result = off;
836 lwkt_sendmsg(port, &pmsg->base.lmsg);
840 nxt = sw6->pr_input(&m, &off, nxt);
848 /* msg was embedded in the mbuf, do not reply! */
852 * We have to call the pr_input() function from the correct protocol
853 * thread. The sw6->pr_soport() request at the end of ip6_input()
854 * returns the port and we forward a netmsg to the port to execute
858 transport6_processing_handler(netmsg_t netmsg)
860 struct netmsg_packet *pmsg = (struct netmsg_packet *)netmsg;
865 sw6 = &inet6sw[ip6_protox[pmsg->nm_nxt]];
866 hlen = pmsg->base.lmsg.u.ms_result;
868 nxt = sw6->pr_input(&pmsg->nm_packet, &hlen, pmsg->nm_nxt);
869 KKASSERT(nxt == IPPROTO_DONE);
870 /* netmsg was embedded in the mbuf, do not reply! */
874 * set/grab in6_ifaddr correspond to IPv6 destination address.
875 * XXX backward compatibility wrapper
877 static struct ip6aux *
878 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
884 n->ip6a_dstia6 = ia6;
885 return n; /* NULL if failed to set */
889 ip6_getdstifaddr(struct mbuf *m)
895 return n->ip6a_dstia6;
901 * Hop-by-Hop options header processing. If a valid jumbo payload option is
902 * included, the real payload length will be stored in plenp.
905 ip6_hopopts_input(u_int32_t *plenp,
906 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
910 struct mbuf *m = *mp;
911 int off = *offp, hbhlen;
914 /* validation of the length of the header */
915 #ifndef PULLDOWN_TEST
916 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
917 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
918 hbhlen = (hbh->ip6h_len + 1) << 3;
920 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
921 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
923 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
924 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
926 ip6stat.ip6s_tooshort++;
929 hbhlen = (hbh->ip6h_len + 1) << 3;
930 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
933 ip6stat.ip6s_tooshort++;
938 hbhlen -= sizeof(struct ip6_hbh);
940 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
941 hbhlen, rtalertp, plenp) < 0)
950 * Search header for all Hop-by-hop options and process each option.
951 * This function is separate from ip6_hopopts_input() in order to
952 * handle a case where the sending node itself process its hop-by-hop
953 * options header. In such a case, the function is called from ip6_output().
955 * The function assumes that hbh header is located right after the IPv6 header
956 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
957 * opthead + hbhlen is located in continuous memory region.
960 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
961 u_int32_t *rtalertp, u_int32_t *plenp)
965 u_int8_t *opt = opthead;
966 u_int16_t rtalert_val;
968 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
970 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
976 if (hbhlen < IP6OPT_MINLEN) {
977 ip6stat.ip6s_toosmall++;
980 optlen = *(opt + 1) + 2;
983 /* XXX may need check for alignment */
984 if (hbhlen < IP6OPT_RTALERT_LEN) {
985 ip6stat.ip6s_toosmall++;
988 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
990 icmp6_error(m, ICMP6_PARAM_PROB,
991 ICMP6_PARAMPROB_HEADER,
992 erroff + opt + 1 - opthead);
995 optlen = IP6OPT_RTALERT_LEN;
996 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
997 *rtalertp = ntohs(rtalert_val);
1000 /* XXX may need check for alignment */
1001 if (hbhlen < IP6OPT_JUMBO_LEN) {
1002 ip6stat.ip6s_toosmall++;
1005 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1007 icmp6_error(m, ICMP6_PARAM_PROB,
1008 ICMP6_PARAMPROB_HEADER,
1009 erroff + opt + 1 - opthead);
1012 optlen = IP6OPT_JUMBO_LEN;
1015 * IPv6 packets that have non 0 payload length
1016 * must not contain a jumbo payload option.
1018 ip6 = mtod(m, struct ip6_hdr *);
1019 if (ip6->ip6_plen) {
1020 ip6stat.ip6s_badoptions++;
1021 icmp6_error(m, ICMP6_PARAM_PROB,
1022 ICMP6_PARAMPROB_HEADER,
1023 erroff + opt - opthead);
1028 * We may see jumbolen in unaligned location, so
1029 * we'd need to perform bcopy().
1031 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1032 jumboplen = (u_int32_t)htonl(jumboplen);
1036 * if there are multiple jumbo payload options,
1037 * *plenp will be non-zero and the packet will be
1039 * the behavior may need some debate in ipngwg -
1040 * multiple options does not make sense, however,
1041 * there's no explicit mention in specification.
1044 ip6stat.ip6s_badoptions++;
1045 icmp6_error(m, ICMP6_PARAM_PROB,
1046 ICMP6_PARAMPROB_HEADER,
1047 erroff + opt + 2 - opthead);
1053 * jumbo payload length must be larger than 65535.
1055 if (jumboplen <= IPV6_MAXPACKET) {
1056 ip6stat.ip6s_badoptions++;
1057 icmp6_error(m, ICMP6_PARAM_PROB,
1058 ICMP6_PARAMPROB_HEADER,
1059 erroff + opt + 2 - opthead);
1065 default: /* unknown option */
1066 if (hbhlen < IP6OPT_MINLEN) {
1067 ip6stat.ip6s_toosmall++;
1070 optlen = ip6_unknown_opt(opt, m,
1071 erroff + opt - opthead);
1087 * Unknown option processing.
1088 * The third argument `off' is the offset from the IPv6 header to the option,
1089 * which is necessary if the IPv6 header the and option header and IPv6 header
1090 * is not continuous in order to return an ICMPv6 error.
1093 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1095 struct ip6_hdr *ip6;
1097 switch (IP6OPT_TYPE(*optp)) {
1098 case IP6OPT_TYPE_SKIP: /* ignore the option */
1099 return ((int)*(optp + 1));
1100 case IP6OPT_TYPE_DISCARD: /* silently discard */
1103 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1104 ip6stat.ip6s_badoptions++;
1105 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1107 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1108 ip6stat.ip6s_badoptions++;
1109 ip6 = mtod(m, struct ip6_hdr *);
1110 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1111 (m->m_flags & (M_BCAST|M_MCAST)))
1114 icmp6_error(m, ICMP6_PARAM_PROB,
1115 ICMP6_PARAMPROB_OPTION, off);
1119 m_freem(m); /* XXX: NOTREACHED */
1124 * Create the "control" list for this pcb.
1125 * The function will not modify mbuf chain at all.
1127 * with KAME mbuf chain restriction:
1128 * The routine will be called from upper layer handlers like tcp6_input().
1129 * Thus the routine assumes that the caller (tcp6_input) have already
1130 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1131 * very first mbuf on the mbuf chain.
1134 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1137 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1138 struct thread *td = curthread; /* XXX */
1142 if (priv_check(td, PRIV_ROOT) == 0)
1146 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1150 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1151 SCM_TIMESTAMP, SOL_SOCKET);
1153 mp = &(*mp)->m_next;
1158 /* RFC 2292 sec. 5 */
1159 if (in6p->in6p_flags & IN6P_PKTINFO) {
1160 struct in6_pktinfo pi6;
1161 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1162 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1163 pi6.ipi6_addr.s6_addr16[1] = 0;
1164 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1165 ? m->m_pkthdr.rcvif->if_index
1167 *mp = sbcreatecontrol((caddr_t) &pi6,
1168 sizeof(struct in6_pktinfo), IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO),
1171 mp = &(*mp)->m_next;
1174 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1175 int hlim = ip6->ip6_hlim & 0xff;
1176 *mp = sbcreatecontrol((caddr_t) &hlim,
1177 sizeof(int), IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1179 mp = &(*mp)->m_next;
1182 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1186 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1189 tclass = flowinfo & 0xff;
1190 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1191 IPV6_TCLASS, IPPROTO_IPV6);
1193 mp = &(*mp)->m_next;
1197 * IPV6_HOPOPTS socket option. We require super-user privilege
1198 * for the option, but it might be too strict, since there might
1199 * be some hop-by-hop options which can be returned to normal user.
1200 * See RFC 2292 section 6.
1202 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1204 * Check if a hop-by-hop options header is contatined in the
1205 * received packet, and if so, store the options as ancillary
1206 * data. Note that a hop-by-hop options header must be
1207 * just after the IPv6 header, which fact is assured through
1208 * the IPv6 input processing.
1210 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1211 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1212 struct ip6_hbh *hbh;
1214 #ifdef PULLDOWN_TEST
1218 #ifndef PULLDOWN_TEST
1219 hbh = (struct ip6_hbh *)(ip6 + 1);
1220 hbhlen = (hbh->ip6h_len + 1) << 3;
1222 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1225 ip6stat.ip6s_tooshort++;
1228 hbh = mtod(ext, struct ip6_hbh *);
1229 hbhlen = (hbh->ip6h_len + 1) << 3;
1230 if (hbhlen != ext->m_len) {
1232 ip6stat.ip6s_tooshort++;
1238 * XXX: We copy whole the header even if a jumbo
1239 * payload option is included, which option is to
1240 * be removed before returning in the RFC 2292.
1241 * Note: this constraint is removed in 2292bis.
1243 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1244 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), IPPROTO_IPV6);
1246 mp = &(*mp)->m_next;
1247 #ifdef PULLDOWN_TEST
1253 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1254 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1255 int proto, off, nxt;
1258 * go through the header chain to see if a routing header is
1259 * contained in the packet. We need this information to store
1260 * destination options headers (if any) properly.
1261 * XXX: performance issue. We should record this info when
1262 * processing extension headers in incoming routine.
1265 proto = IPPROTO_IPV6;
1271 newoff = ip6_nexthdr(m, off, proto, &nxt);
1274 if (newoff < off) /* invalid, check for safety */
1276 if ((proto = nxt) == IPPROTO_ROUTING)
1282 if ((in6p->in6p_flags &
1283 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1284 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1285 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1288 * Search for destination options headers or routing
1289 * header(s) through the header chain, and stores each
1290 * header as ancillary data.
1291 * Note that the order of the headers remains in
1292 * the chain of ancillary data.
1294 while (1) { /* is explicit loop prevention necessary? */
1295 struct ip6_ext *ip6e = NULL;
1297 #ifdef PULLDOWN_TEST
1298 struct mbuf *ext = NULL;
1302 * if it is not an extension header, don't try to
1303 * pull it from the chain.
1306 case IPPROTO_DSTOPTS:
1307 case IPPROTO_ROUTING:
1308 case IPPROTO_HOPOPTS:
1309 case IPPROTO_AH: /* is it possible? */
1315 #ifndef PULLDOWN_TEST
1316 if (off + sizeof(*ip6e) > m->m_len)
1318 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1319 if (nxt == IPPROTO_AH)
1320 elen = (ip6e->ip6e_len + 2) << 2;
1322 elen = (ip6e->ip6e_len + 1) << 3;
1323 if (off + elen > m->m_len)
1326 ext = ip6_pullexthdr(m, off, nxt);
1328 ip6stat.ip6s_tooshort++;
1331 ip6e = mtod(ext, struct ip6_ext *);
1332 if (nxt == IPPROTO_AH)
1333 elen = (ip6e->ip6e_len + 2) << 2;
1335 elen = (ip6e->ip6e_len + 1) << 3;
1336 if (elen != ext->m_len) {
1338 ip6stat.ip6s_tooshort++;
1344 case IPPROTO_DSTOPTS:
1345 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1349 * We also require super-user privilege for
1351 * See the comments on IN6_HOPOPTS.
1356 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1357 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1360 mp = &(*mp)->m_next;
1362 case IPPROTO_ROUTING:
1363 if (!(in6p->in6p_flags & IN6P_RTHDR))
1366 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1367 IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1370 mp = &(*mp)->m_next;
1372 case IPPROTO_HOPOPTS:
1373 case IPPROTO_AH: /* is it possible? */
1378 * other cases have been filtered in the above.
1379 * none will visit this case. here we supply
1380 * the code just in case (nxt overwritten or
1383 #ifdef PULLDOWN_TEST
1390 /* proceed with the next header. */
1392 nxt = ip6e->ip6e_nxt;
1394 #ifdef PULLDOWN_TEST
1406 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1410 struct ip6_mtuinfo mtuctl;
1412 so = in6p->inp_socket;
1418 if (so == NULL) /* I believe this is impossible */
1419 panic("ip6_notify_pmtu: socket is NULL");
1422 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1423 mtuctl.ip6m_mtu = *mtu;
1424 mtuctl.ip6m_addr = *dst;
1426 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1427 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1430 lwkt_gettoken(&so->so_rcv.ssb_token);
1431 if (sbappendaddr(&so->so_rcv.sb, (struct sockaddr *)dst, NULL, m_mtu)
1434 /* XXX: should count statistics */
1438 lwkt_reltoken(&so->so_rcv.ssb_token);
1441 #ifdef PULLDOWN_TEST
1443 * pull single extension header from mbuf chain. returns single mbuf that
1444 * contains the result, or NULL on error.
1446 static struct mbuf *
1447 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1449 struct ip6_ext ip6e;
1455 case IPPROTO_DSTOPTS:
1456 case IPPROTO_ROUTING:
1457 case IPPROTO_HOPOPTS:
1458 case IPPROTO_AH: /* is it possible? */
1461 kprintf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1465 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1466 if (nxt == IPPROTO_AH)
1467 elen = (ip6e.ip6e_len + 2) << 2;
1469 elen = (ip6e.ip6e_len + 1) << 3;
1471 n = m_getb(elen, M_NOWAIT, MT_DATA, 0);
1476 if (elen >= M_TRAILINGSPACE(n)) {
1481 m_copydata(m, off, elen, mtod(n, caddr_t));
1488 * Get pointer to the previous header followed by the header
1489 * currently processed.
1490 * XXX: This function supposes that
1491 * M includes all headers,
1492 * the next header field and the header length field of each header
1494 * the sum of each header length equals to OFF.
1495 * Because of these assumptions, this function must be called very
1496 * carefully. Moreover, it will not be used in the near future when
1497 * we develop `neater' mechanism to process extension headers.
1500 ip6_get_prevhdr(struct mbuf *m, int off)
1502 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1504 if (off == sizeof(struct ip6_hdr))
1505 return (&ip6->ip6_nxt);
1508 struct ip6_ext *ip6e = NULL;
1511 len = sizeof(struct ip6_hdr);
1513 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1516 case IPPROTO_FRAGMENT:
1517 len += sizeof(struct ip6_frag);
1520 len += (ip6e->ip6e_len + 2) << 2;
1523 len += (ip6e->ip6e_len + 1) << 3;
1526 nxt = ip6e->ip6e_nxt;
1529 return (&ip6e->ip6e_nxt);
1536 * get next header offset. m will be retained.
1539 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1542 struct ip6_ext ip6e;
1547 panic("ip6_nexthdr: m == NULL");
1548 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1553 if (m->m_pkthdr.len < off + sizeof(ip6))
1555 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1557 *nxtp = ip6.ip6_nxt;
1561 case IPPROTO_FRAGMENT:
1563 * terminate parsing if it is not the first fragment,
1564 * it does not make sense to parse through it.
1566 if (m->m_pkthdr.len < off + sizeof(fh))
1568 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1569 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1570 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1573 *nxtp = fh.ip6f_nxt;
1574 off += sizeof(struct ip6_frag);
1578 if (m->m_pkthdr.len < off + sizeof(ip6e))
1580 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1582 *nxtp = ip6e.ip6e_nxt;
1583 off += (ip6e.ip6e_len + 2) << 2;
1586 case IPPROTO_HOPOPTS:
1587 case IPPROTO_ROUTING:
1588 case IPPROTO_DSTOPTS:
1589 if (m->m_pkthdr.len < off + sizeof(ip6e))
1591 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1593 *nxtp = ip6e.ip6e_nxt;
1594 off += (ip6e.ip6e_len + 1) << 3;
1599 case IPPROTO_IPCOMP:
1611 * get offset for the last header in the chain. m will be kept untainted.
1614 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1624 newoff = ip6_nexthdr(m, off, proto, nxtp);
1627 else if (newoff < off)
1628 return -1; /* invalid */
1629 else if (newoff == off)
1638 ip6_addaux(struct mbuf *m)
1640 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1642 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1643 sizeof (struct ip6aux),
1646 m_tag_prepend(m, tag);
1649 bzero(m_tag_data(tag), sizeof (struct ip6aux));
1650 return tag ? (struct ip6aux *)m_tag_data(tag) : NULL;
1654 ip6_findaux(struct mbuf *m)
1656 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1657 return tag ? (struct ip6aux*)(tag+1) : NULL;
1661 ip6_delaux(struct mbuf *m)
1663 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1665 m_tag_delete(m, tag);
1669 * System control for IP6
1672 u_char inet6ctlerrmap[PRC_NCMDS] = {
1674 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1675 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1676 EMSGSIZE, EHOSTUNREACH, 0, 0,