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 $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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65 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
68 #include "opt_ip6fw.h"
70 #include "opt_inet6.h"
71 #include "opt_ipsec.h"
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/malloc.h>
77 #include <sys/domain.h>
78 #include <sys/protosw.h>
79 #include <sys/socket.h>
80 #include <sys/socketvar.h>
81 #include <sys/errno.h>
83 #include <sys/kernel.h>
84 #include <sys/syslog.h>
89 #include <net/if_types.h>
90 #include <net/if_dl.h>
91 #include <net/route.h>
92 #include <net/netisr.h>
95 #include <sys/thread2.h>
96 #include <sys/msgport2.h>
97 #include <net/netmsg2.h>
99 #include <netinet/in.h>
100 #include <netinet/in_systm.h>
102 #include <netinet/ip.h>
103 #include <netinet/ip_icmp.h>
105 #include <netinet/ip6.h>
106 #include <netinet6/in6_var.h>
107 #include <netinet6/ip6_var.h>
108 #include <netinet/in_pcb.h>
109 #include <netinet/icmp6.h>
110 #include <netinet6/scope6_var.h>
111 #include <netinet6/in6_ifattach.h>
112 #include <netinet6/nd6.h>
113 #include <netinet6/in6_prefix.h>
116 #include <netinet6/ipsec.h>
118 #include <netinet6/ipsec6.h>
123 #include <netproto/ipsec/ipsec.h>
124 #include <netproto/ipsec/ipsec6.h>
126 #endif /* FAST_IPSEC */
128 #include <net/ip6fw/ip6_fw.h>
130 #include <netinet6/ip6protosw.h>
132 #include <net/net_osdep.h>
134 extern struct domain inet6domain;
135 extern struct protosw inet6sw[];
137 u_char ip6_protox[IPPROTO_MAX];
138 struct in6_ifaddr *in6_ifaddr;
140 extern struct callout in6_tmpaddrtimer_ch;
142 int ip6_forward_srcrt; /* XXX */
143 int ip6_sourcecheck; /* XXX */
144 int ip6_sourcecheck_interval; /* XXX */
146 int ip6_ours_check_algorithm;
148 struct pfil_head inet6_pfil_hook;
151 ip6_fw_chk_t *ip6_fw_chk_ptr;
152 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
153 int ip6_fw_enable = 1;
155 struct ip6stat ip6stat;
157 static void ip6_init2 (void *);
158 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
159 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
160 static void ip6_input(netmsg_t msg);
162 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
164 static void transport6_processing_handler(netmsg_t netmsg);
167 * IP6 initialization: fill in IP6 protocol switch table.
168 * All protocols not implemented in kernel go to raw IP6 protocol handler.
177 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
180 for (i = 0; i < IPPROTO_MAX; i++)
181 ip6_protox[i] = pr - inet6sw;
182 for (pr = inet6domain.dom_protosw;
183 pr < inet6domain.dom_protoswNPROTOSW; pr++)
184 if (pr->pr_domain->dom_family == PF_INET6 &&
185 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
186 ip6_protox[pr->pr_protocol] = pr - inet6sw;
188 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
189 inet6_pfil_hook.ph_af = AF_INET6;
190 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
191 kprintf("%s: WARNING: unable to register pfil hook, "
192 "error %d\n", __func__, i);
195 netisr_register(NETISR_IPV6, ip6_input, NULL); /* XXX cpufn */
197 addrsel_policy_init();
201 * in many cases, random() here does NOT return random number
202 * as initialization during bootstrap time occur in fixed order.
205 ip6_flow_seq = krandom() ^ tv.tv_usec;
207 ip6_desync_factor = (krandom() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
211 ip6_init2(void *dummy)
214 callout_init(&nd6_timer_ch);
215 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
217 /* router renumbering prefix list maintenance */
218 callout_init(&in6_rr_timer_ch);
219 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
221 /* timer for regeneranation of temporary addresses randomize ID */
222 callout_init(&in6_tmpaddrtimer_ch);
223 callout_reset(&in6_tmpaddrtimer_ch,
224 (ip6_temp_preferred_lifetime - ip6_desync_factor -
225 ip6_temp_regen_advance) * hz,
226 in6_tmpaddrtimer, NULL);
230 /* This must be after route_init(), which is now SI_ORDER_THIRD */
231 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
233 extern struct route_in6 ip6_forward_rt;
237 ip6_input(netmsg_t msg)
239 struct mbuf *m = msg->packet.nm_packet;
241 int off = sizeof(struct ip6_hdr), nest;
243 u_int32_t rtalert = ~0;
244 int nxt, ours = 0, rh_present = 0;
245 struct ifnet *deliverifp = NULL;
246 struct in6_addr odst;
251 * should the inner packet be considered authentic?
252 * see comment in ah4_input().
255 m->m_flags &= ~M_AUTHIPHDR;
256 m->m_flags &= ~M_AUTHIPDGM;
261 * make sure we don't have onion peering information into m_aux.
268 if (m->m_flags & M_EXT) {
270 ip6stat.ip6s_mext2m++;
272 ip6stat.ip6s_mext1++;
274 #define M2MMAX NELEM(ip6stat.ip6s_m2m)
276 if (m->m_flags & M_LOOP) {
277 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
278 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
279 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
281 ip6stat.ip6s_m2m[0]++;
287 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
288 ip6stat.ip6s_total++;
290 #ifndef PULLDOWN_TEST
292 * L2 bridge code and some other code can return mbuf chain
293 * that does not conform to KAME requirement. too bad.
294 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
296 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
299 n = m_getb(m->m_pkthdr.len, MB_DONTWAIT, MT_HEADER, M_PKTHDR);
304 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
305 n->m_len = n->m_pkthdr.len;
309 IP6_EXTHDR_CHECK_VOIDRET(m, 0, sizeof(struct ip6_hdr));
312 if (m->m_len < sizeof(struct ip6_hdr)) {
314 inifp = m->m_pkthdr.rcvif;
315 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
316 ip6stat.ip6s_toosmall++;
317 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
322 ip6 = mtod(m, struct ip6_hdr *);
324 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
325 ip6stat.ip6s_badvers++;
326 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
331 * Run through list of hooks for input packets.
333 * NB: Beware of the destination address changing
334 * (e.g. by NAT rewriting). When this happens,
335 * tell ip6_forward to do the right thing.
337 if (pfil_has_hooks(&inet6_pfil_hook)) {
339 if (pfil_run_hooks(&inet6_pfil_hook, &m,
340 m->m_pkthdr.rcvif, PFIL_IN)) {
343 if (m == NULL) /* consumed by filter */
345 ip6 = mtod(m, struct ip6_hdr *);
346 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
349 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
352 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
353 /* packet is dropped by traffic conditioner */
359 * Check with the firewall...
361 if (ip6_fw_enable && ip6_fw_chk_ptr) {
363 /* If ipfw says divert, we have to just drop packet */
364 /* use port as a dummy argument */
365 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
374 * Check against address spoofing/corruption.
376 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
377 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
379 * XXX: "badscope" is not very suitable for a multicast source.
381 ip6stat.ip6s_badscope++;
382 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
385 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
386 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
387 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
388 ip6stat.ip6s_badscope++;
389 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
394 * The following check is not documented in specs. A malicious
395 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
396 * and bypass security checks (act as if it was from 127.0.0.1 by using
397 * IPv6 src ::ffff:127.0.0.1). Be cautious.
399 * This check chokes if we are in an SIIT cloud. As none of BSDs
400 * support IPv4-less kernel compilation, we cannot support SIIT
401 * environment at all. So, it makes more sense for us to reject any
402 * malicious packets for non-SIIT environment, than try to do a
403 * partical support for SIIT environment.
405 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
406 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
407 ip6stat.ip6s_badscope++;
408 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
413 * Reject packets with IPv4 compatible addresses (auto tunnel).
415 * The code forbids auto tunnel relay case in RFC1933 (the check is
416 * stronger than RFC1933). We may want to re-enable it if mech-xx
417 * is revised to forbid relaying case.
419 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
420 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
421 ip6stat.ip6s_badscope++;
422 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
427 /* drop packets if interface ID portion is already filled */
428 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
429 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
430 ip6->ip6_src.s6_addr16[1]) {
431 ip6stat.ip6s_badscope++;
434 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
435 ip6->ip6_dst.s6_addr16[1]) {
436 ip6stat.ip6s_badscope++;
441 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
442 ip6->ip6_src.s6_addr16[1]
443 = htons(m->m_pkthdr.rcvif->if_index);
444 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
445 ip6->ip6_dst.s6_addr16[1]
446 = htons(m->m_pkthdr.rcvif->if_index);
448 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
450 * We use rt->rt_ifp to determine if the address is ours or not.
451 * If rt_ifp is lo0, the address is ours.
452 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
453 * so any address under fe80::%lo0/64 will be mistakenly considered
454 * local. The special case is supplied to handle the case properly
455 * by actually looking at interface addresses
456 * (using in6ifa_ifpwithaddr).
458 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
459 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
460 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
461 icmp6_error(m, ICMP6_DST_UNREACH,
462 ICMP6_DST_UNREACH_ADDR, 0);
463 /* m is already freed */
468 deliverifp = m->m_pkthdr.rcvif;
476 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
477 struct in6_multi *in6m = NULL;
479 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
481 * See if we belong to the destination multicast group on the
484 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
487 else if (!ip6_mrouter) {
488 ip6stat.ip6s_notmember++;
489 ip6stat.ip6s_cantforward++;
490 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
493 deliverifp = m->m_pkthdr.rcvif;
500 switch (ip6_ours_check_algorithm) {
503 * XXX: I intentionally broke our indentation rule here,
504 * since this switch-case is just for measurement and
505 * therefore should soon be removed.
507 if (ip6_forward_rt.ro_rt != NULL &&
508 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
509 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
510 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
511 ip6stat.ip6s_forward_cachehit++;
513 struct sockaddr_in6 *dst6;
515 if (ip6_forward_rt.ro_rt) {
516 /* route is down or destination is different */
517 ip6stat.ip6s_forward_cachemiss++;
518 RTFREE(ip6_forward_rt.ro_rt);
519 ip6_forward_rt.ro_rt = 0;
522 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
523 dst6 = &ip6_forward_rt.ro_dst;
524 dst6->sin6_len = sizeof(struct sockaddr_in6);
525 dst6->sin6_family = AF_INET6;
526 dst6->sin6_addr = ip6->ip6_dst;
528 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
531 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
534 * Accept the packet if the forwarding interface to the destination
535 * according to the routing table is the loopback interface,
536 * unless the associated route has a gateway.
537 * Note that this approach causes to accept a packet if there is a
538 * route to the loopback interface for the destination of the packet.
539 * But we think it's even useful in some situations, e.g. when using
540 * a special daemon which wants to intercept the packet.
542 * XXX: some OSes automatically make a cloned route for the destination
543 * of an outgoing packet. If the outgoing interface of the packet
544 * is a loopback one, the kernel would consider the packet to be
545 * accepted, even if we have no such address assinged on the interface.
546 * We check the cloned flag of the route entry to reject such cases,
547 * assuming that route entries for our own addresses are not made by
548 * cloning (it should be true because in6_addloop explicitly installs
549 * the host route). However, we might have to do an explicit check
550 * while it would be less efficient. Or, should we rather install a
551 * reject route for such a case?
553 if (ip6_forward_rt.ro_rt &&
554 (ip6_forward_rt.ro_rt->rt_flags &
555 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
557 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
560 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
564 * The check below is redundant since the comparison of
565 * the destination and the key of the rtentry has
566 * already done through looking up the routing table.
568 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
569 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
571 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
572 struct in6_ifaddr *ia6 =
573 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
576 * record address information into m_aux.
578 ip6_setdstifaddr(m, ia6);
581 * packets to a tentative, duplicated, or somehow invalid
582 * address must not be accepted.
584 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
585 /* this address is ready */
587 deliverifp = ia6->ia_ifp; /* correct? */
588 /* Count the packet in the ip address stats */
589 IFA_STAT_INC(&ia6->ia_ifa, ipackets, 1);
590 IFA_STAT_INC(&ia6->ia_ifa, ibytes, m->m_pkthdr.len);
593 /* address is not ready, so discard the packet. */
595 "ip6_input: packet to an unready address %s->%s\n",
596 ip6_sprintf(&ip6->ip6_src),
597 ip6_sprintf(&ip6->ip6_dst)));
602 } /* XXX indentation (see above) */
605 * FAITH(Firewall Aided Internet Translator)
608 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
609 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
610 /* XXX do we need more sanity checks? */
612 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
618 * Now there is no reason to process the packet if it's not our own
619 * and we're not a router.
621 if (!ip6_forwarding) {
622 ip6stat.ip6s_cantforward++;
623 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
629 * record address information into m_aux, if we don't have one yet.
630 * note that we are unable to record it, if the address is not listed
631 * as our interface address (e.g. multicast addresses, addresses
632 * within FAITH prefixes and such).
634 if (deliverifp && !ip6_getdstifaddr(m)) {
635 struct in6_ifaddr *ia6;
637 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
639 if (!ip6_setdstifaddr(m, ia6)) {
641 * XXX maybe we should drop the packet here,
642 * as we could not provide enough information
643 * to the upper layers.
650 * Process Hop-by-Hop options header if it's contained.
651 * m may be modified in ip6_hopopts_input().
652 * If a JumboPayload option is included, plen will also be modified.
654 plen = (u_int32_t)ntohs(ip6->ip6_plen);
655 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
658 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
659 #if 0 /*touches NULL pointer*/
660 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
662 goto bad2; /* m have already been freed */
666 ip6 = mtod(m, struct ip6_hdr *);
669 * if the payload length field is 0 and the next header field
670 * indicates Hop-by-Hop Options header, then a Jumbo Payload
671 * option MUST be included.
673 if (ip6->ip6_plen == 0 && plen == 0) {
675 * Note that if a valid jumbo payload option is
676 * contained, ip6_hoptops_input() must set a valid
677 * (non-zero) payload length to the variable plen.
679 ip6stat.ip6s_badoptions++;
680 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
681 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
682 icmp6_error(m, ICMP6_PARAM_PROB,
683 ICMP6_PARAMPROB_HEADER,
684 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
687 #ifndef PULLDOWN_TEST
688 /* ip6_hopopts_input() ensures that mbuf is contiguous */
689 hbh = (struct ip6_hbh *)(ip6 + 1);
691 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
692 sizeof(struct ip6_hbh));
694 ip6stat.ip6s_tooshort++;
701 * If we are acting as a router and the packet contains a
702 * router alert option, see if we know the option value.
703 * Currently, we only support the option value for MLD, in which
704 * case we should pass the packet to the multicast routing
707 if (rtalert != ~0 && ip6_forwarding) {
709 case IP6OPT_RTALERT_MLD:
714 * RFC2711 requires unrecognized values must be
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);
791 while (nxt != IPPROTO_DONE) {
794 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
795 ip6stat.ip6s_toomanyhdr++;
796 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
801 * protection against faulty packet - there should be
802 * more sanity checks in header chain processing.
804 if (m->m_pkthdr.len < off) {
805 ip6stat.ip6s_tooshort++;
806 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
812 * do we need to do it for every header? yeah, other
813 * functions can play with it (like re-allocate and copy).
815 mhist = ip6_addaux(m);
816 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
817 hist = mtod(mhist, caddr_t) + mhist->m_len;
818 bcopy(&nxt, hist, sizeof(nxt));
819 mhist->m_len += sizeof(nxt);
821 ip6stat.ip6s_toomanyhdr++;
826 if (nxt == IPPROTO_ROUTING) {
828 in6_ifstat_inc(m->m_pkthdr.rcvif,
830 ip6stat.ip6s_badoptions++;
835 sw6 = &inet6sw[ip6_protox[nxt]];
838 * enforce IPsec policy checking if we are seeing last header.
839 * note that we do not visit this with protocols with pcb layer
840 * code - like udp/tcp/raw ip.
842 if ((sw6->pr_flags & PR_LASTHDR) && ipsec6_in_reject(m, NULL)) {
843 ipsec6stat.in_polvio++;
848 * If this is a terminal header forward to the port, otherwise
849 * process synchronously for more headers.
851 if (sw6->pr_flags & PR_LASTHDR) {
852 struct netmsg_packet *pmsg;
855 port = netisr_portfn(0); /* XXX */
856 KKASSERT(port != NULL);
857 pmsg = &m->m_hdr.mh_netmsg;
858 netmsg_init(&pmsg->base, NULL,
859 &netisr_apanic_rport,
860 0, transport6_processing_handler);
863 pmsg->base.lmsg.u.ms_result = off;
864 lwkt_sendmsg(port, &pmsg->base.lmsg);
868 nxt = sw6->pr_input(&m, &off, nxt);
876 /* msg was embedded in the mbuf, do not reply! */
880 * We have to call the pr_input() function from the correct protocol
881 * thread. The sw6->pr_soport() request at the end of ip6_input()
882 * returns the port and we forward a netmsg to the port to execute
886 transport6_processing_handler(netmsg_t netmsg)
888 struct netmsg_packet *pmsg = (struct netmsg_packet *)netmsg;
893 sw6 = &inet6sw[ip6_protox[pmsg->nm_nxt]];
894 hlen = pmsg->base.lmsg.u.ms_result;
896 nxt = sw6->pr_input(&pmsg->nm_packet, &hlen, pmsg->nm_nxt);
897 KKASSERT(nxt == IPPROTO_DONE);
898 /* netmsg was embedded in the mbuf, do not reply! */
902 * set/grab in6_ifaddr correspond to IPv6 destination address.
903 * XXX backward compatibility wrapper
905 static struct ip6aux *
906 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
912 n->ip6a_dstia6 = ia6;
913 return n; /* NULL if failed to set */
917 ip6_getdstifaddr(struct mbuf *m)
923 return n->ip6a_dstia6;
929 * Hop-by-Hop options header processing. If a valid jumbo payload option is
930 * included, the real payload length will be stored in plenp.
933 ip6_hopopts_input(u_int32_t *plenp,
934 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
938 struct mbuf *m = *mp;
939 int off = *offp, hbhlen;
942 /* validation of the length of the header */
943 #ifndef PULLDOWN_TEST
944 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
945 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
946 hbhlen = (hbh->ip6h_len + 1) << 3;
948 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
949 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
951 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
952 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
954 ip6stat.ip6s_tooshort++;
957 hbhlen = (hbh->ip6h_len + 1) << 3;
958 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
961 ip6stat.ip6s_tooshort++;
966 hbhlen -= sizeof(struct ip6_hbh);
968 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
969 hbhlen, rtalertp, plenp) < 0)
978 * Search header for all Hop-by-hop options and process each option.
979 * This function is separate from ip6_hopopts_input() in order to
980 * handle a case where the sending node itself process its hop-by-hop
981 * options header. In such a case, the function is called from ip6_output().
983 * The function assumes that hbh header is located right after the IPv6 header
984 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
985 * opthead + hbhlen is located in continuous memory region.
988 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
989 u_int32_t *rtalertp, u_int32_t *plenp)
993 u_int8_t *opt = opthead;
994 u_int16_t rtalert_val;
996 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
998 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1004 if (hbhlen < IP6OPT_MINLEN) {
1005 ip6stat.ip6s_toosmall++;
1008 optlen = *(opt + 1) + 2;
1010 case IP6OPT_RTALERT:
1011 /* XXX may need check for alignment */
1012 if (hbhlen < IP6OPT_RTALERT_LEN) {
1013 ip6stat.ip6s_toosmall++;
1016 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1018 icmp6_error(m, ICMP6_PARAM_PROB,
1019 ICMP6_PARAMPROB_HEADER,
1020 erroff + opt + 1 - opthead);
1023 optlen = IP6OPT_RTALERT_LEN;
1024 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1025 *rtalertp = ntohs(rtalert_val);
1028 /* XXX may need check for alignment */
1029 if (hbhlen < IP6OPT_JUMBO_LEN) {
1030 ip6stat.ip6s_toosmall++;
1033 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1035 icmp6_error(m, ICMP6_PARAM_PROB,
1036 ICMP6_PARAMPROB_HEADER,
1037 erroff + opt + 1 - opthead);
1040 optlen = IP6OPT_JUMBO_LEN;
1043 * IPv6 packets that have non 0 payload length
1044 * must not contain a jumbo payload option.
1046 ip6 = mtod(m, struct ip6_hdr *);
1047 if (ip6->ip6_plen) {
1048 ip6stat.ip6s_badoptions++;
1049 icmp6_error(m, ICMP6_PARAM_PROB,
1050 ICMP6_PARAMPROB_HEADER,
1051 erroff + opt - opthead);
1056 * We may see jumbolen in unaligned location, so
1057 * we'd need to perform bcopy().
1059 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1060 jumboplen = (u_int32_t)htonl(jumboplen);
1064 * if there are multiple jumbo payload options,
1065 * *plenp will be non-zero and the packet will be
1067 * the behavior may need some debate in ipngwg -
1068 * multiple options does not make sense, however,
1069 * there's no explicit mention in specification.
1072 ip6stat.ip6s_badoptions++;
1073 icmp6_error(m, ICMP6_PARAM_PROB,
1074 ICMP6_PARAMPROB_HEADER,
1075 erroff + opt + 2 - opthead);
1081 * jumbo payload length must be larger than 65535.
1083 if (jumboplen <= IPV6_MAXPACKET) {
1084 ip6stat.ip6s_badoptions++;
1085 icmp6_error(m, ICMP6_PARAM_PROB,
1086 ICMP6_PARAMPROB_HEADER,
1087 erroff + opt + 2 - opthead);
1093 default: /* unknown option */
1094 if (hbhlen < IP6OPT_MINLEN) {
1095 ip6stat.ip6s_toosmall++;
1098 optlen = ip6_unknown_opt(opt, m,
1099 erroff + opt - opthead);
1115 * Unknown option processing.
1116 * The third argument `off' is the offset from the IPv6 header to the option,
1117 * which is necessary if the IPv6 header the and option header and IPv6 header
1118 * is not continuous in order to return an ICMPv6 error.
1121 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1123 struct ip6_hdr *ip6;
1125 switch (IP6OPT_TYPE(*optp)) {
1126 case IP6OPT_TYPE_SKIP: /* ignore the option */
1127 return ((int)*(optp + 1));
1128 case IP6OPT_TYPE_DISCARD: /* silently discard */
1131 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1132 ip6stat.ip6s_badoptions++;
1133 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1135 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1136 ip6stat.ip6s_badoptions++;
1137 ip6 = mtod(m, struct ip6_hdr *);
1138 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1139 (m->m_flags & (M_BCAST|M_MCAST)))
1142 icmp6_error(m, ICMP6_PARAM_PROB,
1143 ICMP6_PARAMPROB_OPTION, off);
1147 m_freem(m); /* XXX: NOTREACHED */
1152 * Create the "control" list for this pcb.
1153 * The function will not modify mbuf chain at all.
1155 * with KAME mbuf chain restriction:
1156 * The routine will be called from upper layer handlers like tcp6_input().
1157 * Thus the routine assumes that the caller (tcp6_input) have already
1158 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1159 * very first mbuf on the mbuf chain.
1162 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1165 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1166 struct thread *td = curthread; /* XXX */
1170 if (priv_check(td, PRIV_ROOT) == 0)
1174 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1178 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1179 SCM_TIMESTAMP, SOL_SOCKET);
1181 mp = &(*mp)->m_next;
1186 /* RFC 2292 sec. 5 */
1187 if (in6p->in6p_flags & IN6P_PKTINFO) {
1188 struct in6_pktinfo pi6;
1189 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1190 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1191 pi6.ipi6_addr.s6_addr16[1] = 0;
1192 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1193 ? m->m_pkthdr.rcvif->if_index
1195 *mp = sbcreatecontrol((caddr_t) &pi6,
1196 sizeof(struct in6_pktinfo), IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO),
1199 mp = &(*mp)->m_next;
1202 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1203 int hlim = ip6->ip6_hlim & 0xff;
1204 *mp = sbcreatecontrol((caddr_t) &hlim,
1205 sizeof(int), IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1207 mp = &(*mp)->m_next;
1210 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1214 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1217 tclass = flowinfo & 0xff;
1218 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1219 IPV6_TCLASS, IPPROTO_IPV6);
1221 mp = &(*mp)->m_next;
1225 * IPV6_HOPOPTS socket option. We require super-user privilege
1226 * for the option, but it might be too strict, since there might
1227 * be some hop-by-hop options which can be returned to normal user.
1228 * See RFC 2292 section 6.
1230 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1232 * Check if a hop-by-hop options header is contatined in the
1233 * received packet, and if so, store the options as ancillary
1234 * data. Note that a hop-by-hop options header must be
1235 * just after the IPv6 header, which fact is assured through
1236 * the IPv6 input processing.
1238 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1239 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1240 struct ip6_hbh *hbh;
1242 #ifdef PULLDOWN_TEST
1246 #ifndef PULLDOWN_TEST
1247 hbh = (struct ip6_hbh *)(ip6 + 1);
1248 hbhlen = (hbh->ip6h_len + 1) << 3;
1250 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1253 ip6stat.ip6s_tooshort++;
1256 hbh = mtod(ext, struct ip6_hbh *);
1257 hbhlen = (hbh->ip6h_len + 1) << 3;
1258 if (hbhlen != ext->m_len) {
1260 ip6stat.ip6s_tooshort++;
1266 * XXX: We copy whole the header even if a jumbo
1267 * payload option is included, which option is to
1268 * be removed before returning in the RFC 2292.
1269 * Note: this constraint is removed in 2292bis.
1271 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1272 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), IPPROTO_IPV6);
1274 mp = &(*mp)->m_next;
1275 #ifdef PULLDOWN_TEST
1281 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1282 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1283 int proto, off, nxt;
1286 * go through the header chain to see if a routing header is
1287 * contained in the packet. We need this information to store
1288 * destination options headers (if any) properly.
1289 * XXX: performance issue. We should record this info when
1290 * processing extension headers in incoming routine.
1293 proto = IPPROTO_IPV6;
1299 newoff = ip6_nexthdr(m, off, proto, &nxt);
1302 if (newoff < off) /* invalid, check for safety */
1304 if ((proto = nxt) == IPPROTO_ROUTING)
1310 if ((in6p->in6p_flags &
1311 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1312 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1313 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1316 * Search for destination options headers or routing
1317 * header(s) through the header chain, and stores each
1318 * header as ancillary data.
1319 * Note that the order of the headers remains in
1320 * the chain of ancillary data.
1322 while (1) { /* is explicit loop prevention necessary? */
1323 struct ip6_ext *ip6e = NULL;
1325 #ifdef PULLDOWN_TEST
1326 struct mbuf *ext = NULL;
1330 * if it is not an extension header, don't try to
1331 * pull it from the chain.
1334 case IPPROTO_DSTOPTS:
1335 case IPPROTO_ROUTING:
1336 case IPPROTO_HOPOPTS:
1337 case IPPROTO_AH: /* is it possible? */
1343 #ifndef PULLDOWN_TEST
1344 if (off + sizeof(*ip6e) > m->m_len)
1346 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1347 if (nxt == IPPROTO_AH)
1348 elen = (ip6e->ip6e_len + 2) << 2;
1350 elen = (ip6e->ip6e_len + 1) << 3;
1351 if (off + elen > m->m_len)
1354 ext = ip6_pullexthdr(m, off, nxt);
1356 ip6stat.ip6s_tooshort++;
1359 ip6e = mtod(ext, struct ip6_ext *);
1360 if (nxt == IPPROTO_AH)
1361 elen = (ip6e->ip6e_len + 2) << 2;
1363 elen = (ip6e->ip6e_len + 1) << 3;
1364 if (elen != ext->m_len) {
1366 ip6stat.ip6s_tooshort++;
1372 case IPPROTO_DSTOPTS:
1373 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1377 * We also require super-user privilege for
1379 * See the comments on IN6_HOPOPTS.
1384 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1385 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1388 mp = &(*mp)->m_next;
1390 case IPPROTO_ROUTING:
1391 if (!(in6p->in6p_flags & IN6P_RTHDR))
1394 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1395 IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1398 mp = &(*mp)->m_next;
1400 case IPPROTO_HOPOPTS:
1401 case IPPROTO_AH: /* is it possible? */
1406 * other cases have been filtered in the above.
1407 * none will visit this case. here we supply
1408 * the code just in case (nxt overwritten or
1411 #ifdef PULLDOWN_TEST
1418 /* proceed with the next header. */
1420 nxt = ip6e->ip6e_nxt;
1422 #ifdef PULLDOWN_TEST
1434 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1438 struct ip6_mtuinfo mtuctl;
1440 so = in6p->inp_socket;
1446 if (so == NULL) /* I believe this is impossible */
1447 panic("ip6_notify_pmtu: socket is NULL");
1450 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1451 mtuctl.ip6m_mtu = *mtu;
1452 mtuctl.ip6m_addr = *dst;
1454 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1455 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1458 lwkt_gettoken(&so->so_rcv.ssb_token);
1459 if (sbappendaddr(&so->so_rcv.sb, (struct sockaddr *)dst, NULL, m_mtu)
1462 /* XXX: should count statistics */
1466 lwkt_reltoken(&so->so_rcv.ssb_token);
1469 #ifdef PULLDOWN_TEST
1471 * pull single extension header from mbuf chain. returns single mbuf that
1472 * contains the result, or NULL on error.
1474 static struct mbuf *
1475 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1477 struct ip6_ext ip6e;
1483 case IPPROTO_DSTOPTS:
1484 case IPPROTO_ROUTING:
1485 case IPPROTO_HOPOPTS:
1486 case IPPROTO_AH: /* is it possible? */
1489 kprintf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1493 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1494 if (nxt == IPPROTO_AH)
1495 elen = (ip6e.ip6e_len + 2) << 2;
1497 elen = (ip6e.ip6e_len + 1) << 3;
1499 n = m_getb(elen, MB_DONTWAIT, MT_DATA, 0);
1504 if (elen >= M_TRAILINGSPACE(n)) {
1509 m_copydata(m, off, elen, mtod(n, caddr_t));
1516 * Get pointer to the previous header followed by the header
1517 * currently processed.
1518 * XXX: This function supposes that
1519 * M includes all headers,
1520 * the next header field and the header length field of each header
1522 * the sum of each header length equals to OFF.
1523 * Because of these assumptions, this function must be called very
1524 * carefully. Moreover, it will not be used in the near future when
1525 * we develop `neater' mechanism to process extension headers.
1528 ip6_get_prevhdr(struct mbuf *m, int off)
1530 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1532 if (off == sizeof(struct ip6_hdr))
1533 return (&ip6->ip6_nxt);
1536 struct ip6_ext *ip6e = NULL;
1539 len = sizeof(struct ip6_hdr);
1541 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1544 case IPPROTO_FRAGMENT:
1545 len += sizeof(struct ip6_frag);
1548 len += (ip6e->ip6e_len + 2) << 2;
1551 len += (ip6e->ip6e_len + 1) << 3;
1554 nxt = ip6e->ip6e_nxt;
1557 return (&ip6e->ip6e_nxt);
1564 * get next header offset. m will be retained.
1567 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1570 struct ip6_ext ip6e;
1575 panic("ip6_nexthdr: m == NULL");
1576 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1581 if (m->m_pkthdr.len < off + sizeof(ip6))
1583 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1585 *nxtp = ip6.ip6_nxt;
1589 case IPPROTO_FRAGMENT:
1591 * terminate parsing if it is not the first fragment,
1592 * it does not make sense to parse through it.
1594 if (m->m_pkthdr.len < off + sizeof(fh))
1596 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1597 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1598 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1601 *nxtp = fh.ip6f_nxt;
1602 off += sizeof(struct ip6_frag);
1606 if (m->m_pkthdr.len < off + sizeof(ip6e))
1608 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1610 *nxtp = ip6e.ip6e_nxt;
1611 off += (ip6e.ip6e_len + 2) << 2;
1614 case IPPROTO_HOPOPTS:
1615 case IPPROTO_ROUTING:
1616 case IPPROTO_DSTOPTS:
1617 if (m->m_pkthdr.len < off + sizeof(ip6e))
1619 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1621 *nxtp = ip6e.ip6e_nxt;
1622 off += (ip6e.ip6e_len + 1) << 3;
1627 case IPPROTO_IPCOMP:
1639 * get offset for the last header in the chain. m will be kept untainted.
1642 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1652 newoff = ip6_nexthdr(m, off, proto, nxtp);
1655 else if (newoff < off)
1656 return -1; /* invalid */
1657 else if (newoff == off)
1666 ip6_addaux(struct mbuf *m)
1668 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1670 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1671 sizeof (struct ip6aux),
1674 m_tag_prepend(m, tag);
1677 bzero(m_tag_data(tag), sizeof (struct ip6aux));
1678 return tag ? (struct ip6aux *)m_tag_data(tag) : NULL;
1682 ip6_findaux(struct mbuf *m)
1684 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1685 return tag ? (struct ip6aux*)(tag+1) : NULL;
1689 ip6_delaux(struct mbuf *m)
1691 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1693 m_tag_delete(m, tag);
1697 * System control for IP6
1700 u_char inet6ctlerrmap[PRC_NCMDS] = {
1702 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1703 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1704 EMSGSIZE, EHOSTUNREACH, 0, 0,