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>
98 #include <net/netisr2.h>
100 #include <netinet/in.h>
101 #include <netinet/in_systm.h>
103 #include <netinet/ip.h>
104 #include <netinet/ip_icmp.h>
106 #include <netinet/ip6.h>
107 #include <netinet6/in6_var.h>
108 #include <netinet6/ip6_var.h>
109 #include <netinet/in_pcb.h>
110 #include <netinet/icmp6.h>
111 #include <netinet6/scope6_var.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>
124 #include <netproto/ipsec/ipsec.h>
125 #include <netproto/ipsec/ipsec6.h>
127 #endif /* FAST_IPSEC */
129 #include <net/ip6fw/ip6_fw.h>
131 #include <netinet6/ip6protosw.h>
133 #include <net/net_osdep.h>
135 extern struct domain inet6domain;
136 extern struct protosw inet6sw[];
138 u_char ip6_protox[IPPROTO_MAX];
139 struct in6_ifaddr *in6_ifaddr;
141 extern struct callout in6_tmpaddrtimer_ch;
143 int ip6_forward_srcrt; /* XXX */
144 int ip6_sourcecheck; /* XXX */
145 int ip6_sourcecheck_interval; /* XXX */
147 int ip6_ours_check_algorithm;
149 struct pfil_head inet6_pfil_hook;
152 ip6_fw_chk_t *ip6_fw_chk_ptr;
153 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
154 int ip6_fw_enable = 1;
156 struct ip6stat ip6stat;
158 static void ip6_init2 (void *);
159 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
160 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
161 static void ip6_input(netmsg_t msg);
163 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
165 static void transport6_processing_handler(netmsg_t netmsg);
168 * IP6 initialization: fill in IP6 protocol switch table.
169 * All protocols not implemented in kernel go to raw IP6 protocol handler.
178 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
181 for (i = 0; i < IPPROTO_MAX; i++)
182 ip6_protox[i] = pr - inet6sw;
183 for (pr = inet6domain.dom_protosw;
184 pr < inet6domain.dom_protoswNPROTOSW; pr++)
185 if (pr->pr_domain->dom_family == PF_INET6 &&
186 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
187 ip6_protox[pr->pr_protocol] = pr - inet6sw;
189 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
190 inet6_pfil_hook.ph_af = AF_INET6;
191 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
192 kprintf("%s: WARNING: unable to register pfil hook, "
193 "error %d\n", __func__, i);
196 netisr_register(NETISR_IPV6, ip6_input, NULL); /* XXX hashfn */
198 addrsel_policy_init();
202 * in many cases, random() here does NOT return random number
203 * as initialization during bootstrap time occur in fixed order.
206 ip6_flow_seq = krandom() ^ tv.tv_usec;
208 ip6_desync_factor = (krandom() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
212 ip6_init2(void *dummy)
215 callout_init(&nd6_timer_ch);
216 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
218 /* router renumbering prefix list maintenance */
219 callout_init(&in6_rr_timer_ch);
220 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
222 /* timer for regeneranation of temporary addresses randomize ID */
223 callout_init(&in6_tmpaddrtimer_ch);
224 callout_reset(&in6_tmpaddrtimer_ch,
225 (ip6_temp_preferred_lifetime - ip6_desync_factor -
226 ip6_temp_regen_advance) * hz,
227 in6_tmpaddrtimer, NULL);
231 /* This must be after route_init(), which is now SI_ORDER_THIRD */
232 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
234 extern struct route_in6 ip6_forward_rt;
238 ip6_input(netmsg_t msg)
240 struct mbuf *m = msg->packet.nm_packet;
242 int off = sizeof(struct ip6_hdr), nest;
244 u_int32_t rtalert = ~0;
245 int nxt, ours = 0, rh_present = 0;
246 struct ifnet *deliverifp = NULL;
247 struct in6_addr odst;
252 * should the inner packet be considered authentic?
253 * see comment in ah4_input().
256 m->m_flags &= ~M_AUTHIPHDR;
257 m->m_flags &= ~M_AUTHIPDGM;
262 * make sure we don't have onion peering information into m_aux.
269 if (m->m_flags & M_EXT) {
271 ip6stat.ip6s_mext2m++;
273 ip6stat.ip6s_mext1++;
275 #define M2MMAX NELEM(ip6stat.ip6s_m2m)
277 if (m->m_flags & M_LOOP) {
278 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
279 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
280 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
282 ip6stat.ip6s_m2m[0]++;
288 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
289 ip6stat.ip6s_total++;
291 #ifndef PULLDOWN_TEST
293 * L2 bridge code and some other code can return mbuf chain
294 * that does not conform to KAME requirement. too bad.
295 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
297 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
300 n = m_getb(m->m_pkthdr.len, MB_DONTWAIT, MT_HEADER, M_PKTHDR);
305 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
306 n->m_len = n->m_pkthdr.len;
310 IP6_EXTHDR_CHECK_VOIDRET(m, 0, sizeof(struct ip6_hdr));
313 if (m->m_len < sizeof(struct ip6_hdr)) {
315 inifp = m->m_pkthdr.rcvif;
316 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
317 ip6stat.ip6s_toosmall++;
318 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
323 ip6 = mtod(m, struct ip6_hdr *);
325 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
326 ip6stat.ip6s_badvers++;
327 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
332 * Run through list of hooks for input packets.
334 * NB: Beware of the destination address changing
335 * (e.g. by NAT rewriting). When this happens,
336 * tell ip6_forward to do the right thing.
338 if (pfil_has_hooks(&inet6_pfil_hook)) {
340 if (pfil_run_hooks(&inet6_pfil_hook, &m,
341 m->m_pkthdr.rcvif, PFIL_IN)) {
344 if (m == NULL) /* consumed by filter */
346 ip6 = mtod(m, struct ip6_hdr *);
347 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
350 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
353 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
354 /* packet is dropped by traffic conditioner */
360 * Check with the firewall...
362 if (ip6_fw_enable && ip6_fw_chk_ptr) {
364 /* If ipfw says divert, we have to just drop packet */
365 /* use port as a dummy argument */
366 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
375 * Check against address spoofing/corruption.
377 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
378 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
380 * XXX: "badscope" is not very suitable for a multicast source.
382 ip6stat.ip6s_badscope++;
383 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
386 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
387 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
388 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
389 ip6stat.ip6s_badscope++;
390 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
395 * The following check is not documented in specs. A malicious
396 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
397 * and bypass security checks (act as if it was from 127.0.0.1 by using
398 * IPv6 src ::ffff:127.0.0.1). Be cautious.
400 * This check chokes if we are in an SIIT cloud. As none of BSDs
401 * support IPv4-less kernel compilation, we cannot support SIIT
402 * environment at all. So, it makes more sense for us to reject any
403 * malicious packets for non-SIIT environment, than try to do a
404 * partical support for SIIT environment.
406 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
407 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
408 ip6stat.ip6s_badscope++;
409 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
414 * Reject packets with IPv4 compatible addresses (auto tunnel).
416 * The code forbids auto tunnel relay case in RFC1933 (the check is
417 * stronger than RFC1933). We may want to re-enable it if mech-xx
418 * is revised to forbid relaying case.
420 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
421 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
422 ip6stat.ip6s_badscope++;
423 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
428 /* drop packets if interface ID portion is already filled */
429 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
430 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
431 ip6->ip6_src.s6_addr16[1]) {
432 ip6stat.ip6s_badscope++;
435 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
436 ip6->ip6_dst.s6_addr16[1]) {
437 ip6stat.ip6s_badscope++;
442 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
443 ip6->ip6_src.s6_addr16[1]
444 = htons(m->m_pkthdr.rcvif->if_index);
445 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
446 ip6->ip6_dst.s6_addr16[1]
447 = htons(m->m_pkthdr.rcvif->if_index);
449 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
451 * We use rt->rt_ifp to determine if the address is ours or not.
452 * If rt_ifp is lo0, the address is ours.
453 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
454 * so any address under fe80::%lo0/64 will be mistakenly considered
455 * local. The special case is supplied to handle the case properly
456 * by actually looking at interface addresses
457 * (using in6ifa_ifpwithaddr).
459 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
460 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
461 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
462 icmp6_error(m, ICMP6_DST_UNREACH,
463 ICMP6_DST_UNREACH_ADDR, 0);
464 /* m is already freed */
469 deliverifp = m->m_pkthdr.rcvif;
477 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
478 struct in6_multi *in6m = NULL;
480 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
482 * See if we belong to the destination multicast group on the
485 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
488 else if (!ip6_mrouter) {
489 ip6stat.ip6s_notmember++;
490 ip6stat.ip6s_cantforward++;
491 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
494 deliverifp = m->m_pkthdr.rcvif;
501 switch (ip6_ours_check_algorithm) {
504 * XXX: I intentionally broke our indentation rule here,
505 * since this switch-case is just for measurement and
506 * therefore should soon be removed.
508 if (ip6_forward_rt.ro_rt != NULL &&
509 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
510 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
511 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
512 ip6stat.ip6s_forward_cachehit++;
514 struct sockaddr_in6 *dst6;
516 if (ip6_forward_rt.ro_rt) {
517 /* route is down or destination is different */
518 ip6stat.ip6s_forward_cachemiss++;
519 RTFREE(ip6_forward_rt.ro_rt);
520 ip6_forward_rt.ro_rt = 0;
523 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
524 dst6 = &ip6_forward_rt.ro_dst;
525 dst6->sin6_len = sizeof(struct sockaddr_in6);
526 dst6->sin6_family = AF_INET6;
527 dst6->sin6_addr = ip6->ip6_dst;
529 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
532 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
535 * Accept the packet if the forwarding interface to the destination
536 * according to the routing table is the loopback interface,
537 * unless the associated route has a gateway.
538 * Note that this approach causes to accept a packet if there is a
539 * route to the loopback interface for the destination of the packet.
540 * But we think it's even useful in some situations, e.g. when using
541 * a special daemon which wants to intercept the packet.
543 * XXX: some OSes automatically make a cloned route for the destination
544 * of an outgoing packet. If the outgoing interface of the packet
545 * is a loopback one, the kernel would consider the packet to be
546 * accepted, even if we have no such address assinged on the interface.
547 * We check the cloned flag of the route entry to reject such cases,
548 * assuming that route entries for our own addresses are not made by
549 * cloning (it should be true because in6_addloop explicitly installs
550 * the host route). However, we might have to do an explicit check
551 * while it would be less efficient. Or, should we rather install a
552 * reject route for such a case?
554 if (ip6_forward_rt.ro_rt &&
555 (ip6_forward_rt.ro_rt->rt_flags &
556 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
558 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
561 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
565 * The check below is redundant since the comparison of
566 * the destination and the key of the rtentry has
567 * already done through looking up the routing table.
569 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
570 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
572 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
573 struct in6_ifaddr *ia6 =
574 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
577 * record address information into m_aux.
579 ip6_setdstifaddr(m, ia6);
582 * packets to a tentative, duplicated, or somehow invalid
583 * address must not be accepted.
585 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
586 /* this address is ready */
588 deliverifp = ia6->ia_ifp; /* correct? */
589 /* Count the packet in the ip address stats */
590 IFA_STAT_INC(&ia6->ia_ifa, ipackets, 1);
591 IFA_STAT_INC(&ia6->ia_ifa, ibytes, m->m_pkthdr.len);
594 /* address is not ready, so discard the packet. */
596 "ip6_input: packet to an unready address %s->%s\n",
597 ip6_sprintf(&ip6->ip6_src),
598 ip6_sprintf(&ip6->ip6_dst)));
603 } /* XXX indentation (see above) */
606 * FAITH(Firewall Aided Internet Translator)
609 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
610 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
611 /* XXX do we need more sanity checks? */
613 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
619 * Now there is no reason to process the packet if it's not our own
620 * and we're not a router.
622 if (!ip6_forwarding) {
623 ip6stat.ip6s_cantforward++;
624 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
630 * record address information into m_aux, if we don't have one yet.
631 * note that we are unable to record it, if the address is not listed
632 * as our interface address (e.g. multicast addresses, addresses
633 * within FAITH prefixes and such).
635 if (deliverifp && !ip6_getdstifaddr(m)) {
636 struct in6_ifaddr *ia6;
638 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
640 if (!ip6_setdstifaddr(m, ia6)) {
642 * XXX maybe we should drop the packet here,
643 * as we could not provide enough information
644 * to the upper layers.
651 * Process Hop-by-Hop options header if it's contained.
652 * m may be modified in ip6_hopopts_input().
653 * If a JumboPayload option is included, plen will also be modified.
655 plen = (u_int32_t)ntohs(ip6->ip6_plen);
656 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
659 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
660 #if 0 /*touches NULL pointer*/
661 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
663 goto bad2; /* m have already been freed */
667 ip6 = mtod(m, struct ip6_hdr *);
670 * if the payload length field is 0 and the next header field
671 * indicates Hop-by-Hop Options header, then a Jumbo Payload
672 * option MUST be included.
674 if (ip6->ip6_plen == 0 && plen == 0) {
676 * Note that if a valid jumbo payload option is
677 * contained, ip6_hoptops_input() must set a valid
678 * (non-zero) payload length to the variable plen.
680 ip6stat.ip6s_badoptions++;
681 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
682 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
683 icmp6_error(m, ICMP6_PARAM_PROB,
684 ICMP6_PARAMPROB_HEADER,
685 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
688 #ifndef PULLDOWN_TEST
689 /* ip6_hopopts_input() ensures that mbuf is contiguous */
690 hbh = (struct ip6_hbh *)(ip6 + 1);
692 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
693 sizeof(struct ip6_hbh));
695 ip6stat.ip6s_tooshort++;
702 * If we are acting as a router and the packet contains a
703 * router alert option, see if we know the option value.
704 * Currently, we only support the option value for MLD, in which
705 * case we should pass the packet to the multicast routing
708 if (rtalert != ~0 && ip6_forwarding) {
710 case IP6OPT_RTALERT_MLD:
715 * RFC2711 requires unrecognized values must be
725 * Check that the amount of data in the buffers
726 * is as at least much as the IPv6 header would have us expect.
727 * Trim mbufs if longer than we expect.
728 * Drop packet if shorter than we expect.
730 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
731 ip6stat.ip6s_tooshort++;
732 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
735 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
736 if (m->m_len == m->m_pkthdr.len) {
737 m->m_len = sizeof(struct ip6_hdr) + plen;
738 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
740 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
744 * Forward if desirable.
746 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
748 * If we are acting as a multicast router, all
749 * incoming multicast packets are passed to the
750 * kernel-level multicast forwarding function.
751 * The packet is returned (relatively) intact; if
752 * ip6_mforward() returns a non-zero value, the packet
753 * must be discarded, else it may be accepted below.
755 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
756 ip6stat.ip6s_cantforward++;
762 ip6_forward(m, srcrt);
766 ip6 = mtod(m, struct ip6_hdr *);
769 * Malicious party may be able to use IPv4 mapped addr to confuse
770 * tcp/udp stack and bypass security checks (act as if it was from
771 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
773 * For SIIT end node behavior, you may want to disable the check.
774 * However, you will become vulnerable to attacks using IPv4 mapped
777 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
778 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
779 ip6stat.ip6s_badscope++;
780 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
785 * Tell launch routine the next header
787 ip6stat.ip6s_delivered++;
788 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
792 while (nxt != IPPROTO_DONE) {
795 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
796 ip6stat.ip6s_toomanyhdr++;
797 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
802 * protection against faulty packet - there should be
803 * more sanity checks in header chain processing.
805 if (m->m_pkthdr.len < off) {
806 ip6stat.ip6s_tooshort++;
807 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
813 * do we need to do it for every header? yeah, other
814 * functions can play with it (like re-allocate and copy).
816 mhist = ip6_addaux(m);
817 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
818 hist = mtod(mhist, caddr_t) + mhist->m_len;
819 bcopy(&nxt, hist, sizeof(nxt));
820 mhist->m_len += sizeof(nxt);
822 ip6stat.ip6s_toomanyhdr++;
827 if (nxt == IPPROTO_ROUTING) {
829 in6_ifstat_inc(m->m_pkthdr.rcvif,
831 ip6stat.ip6s_badoptions++;
836 sw6 = &inet6sw[ip6_protox[nxt]];
839 * enforce IPsec policy checking if we are seeing last header.
840 * note that we do not visit this with protocols with pcb layer
841 * code - like udp/tcp/raw ip.
843 if ((sw6->pr_flags & PR_LASTHDR) && ipsec6_in_reject(m, NULL)) {
844 ipsec6stat.in_polvio++;
849 * If this is a terminal header forward to the port, otherwise
850 * process synchronously for more headers.
852 if (sw6->pr_flags & PR_LASTHDR) {
853 struct netmsg_packet *pmsg;
856 port = netisr_cpuport(0); /* XXX */
857 KKASSERT(port != NULL);
858 pmsg = &m->m_hdr.mh_netmsg;
859 netmsg_init(&pmsg->base, NULL,
860 &netisr_apanic_rport,
861 0, transport6_processing_handler);
864 pmsg->base.lmsg.u.ms_result = off;
865 lwkt_sendmsg(port, &pmsg->base.lmsg);
869 nxt = sw6->pr_input(&m, &off, nxt);
877 /* msg was embedded in the mbuf, do not reply! */
881 * We have to call the pr_input() function from the correct protocol
882 * thread. The sw6->pr_soport() request at the end of ip6_input()
883 * returns the port and we forward a netmsg to the port to execute
887 transport6_processing_handler(netmsg_t netmsg)
889 struct netmsg_packet *pmsg = (struct netmsg_packet *)netmsg;
894 sw6 = &inet6sw[ip6_protox[pmsg->nm_nxt]];
895 hlen = pmsg->base.lmsg.u.ms_result;
897 nxt = sw6->pr_input(&pmsg->nm_packet, &hlen, pmsg->nm_nxt);
898 KKASSERT(nxt == IPPROTO_DONE);
899 /* netmsg was embedded in the mbuf, do not reply! */
903 * set/grab in6_ifaddr correspond to IPv6 destination address.
904 * XXX backward compatibility wrapper
906 static struct ip6aux *
907 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
913 n->ip6a_dstia6 = ia6;
914 return n; /* NULL if failed to set */
918 ip6_getdstifaddr(struct mbuf *m)
924 return n->ip6a_dstia6;
930 * Hop-by-Hop options header processing. If a valid jumbo payload option is
931 * included, the real payload length will be stored in plenp.
934 ip6_hopopts_input(u_int32_t *plenp,
935 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
939 struct mbuf *m = *mp;
940 int off = *offp, hbhlen;
943 /* validation of the length of the header */
944 #ifndef PULLDOWN_TEST
945 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
946 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
947 hbhlen = (hbh->ip6h_len + 1) << 3;
949 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
950 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
952 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
953 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
955 ip6stat.ip6s_tooshort++;
958 hbhlen = (hbh->ip6h_len + 1) << 3;
959 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
962 ip6stat.ip6s_tooshort++;
967 hbhlen -= sizeof(struct ip6_hbh);
969 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
970 hbhlen, rtalertp, plenp) < 0)
979 * Search header for all Hop-by-hop options and process each option.
980 * This function is separate from ip6_hopopts_input() in order to
981 * handle a case where the sending node itself process its hop-by-hop
982 * options header. In such a case, the function is called from ip6_output().
984 * The function assumes that hbh header is located right after the IPv6 header
985 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
986 * opthead + hbhlen is located in continuous memory region.
989 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
990 u_int32_t *rtalertp, u_int32_t *plenp)
994 u_int8_t *opt = opthead;
995 u_int16_t rtalert_val;
997 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
999 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1005 if (hbhlen < IP6OPT_MINLEN) {
1006 ip6stat.ip6s_toosmall++;
1009 optlen = *(opt + 1) + 2;
1011 case IP6OPT_RTALERT:
1012 /* XXX may need check for alignment */
1013 if (hbhlen < IP6OPT_RTALERT_LEN) {
1014 ip6stat.ip6s_toosmall++;
1017 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1019 icmp6_error(m, ICMP6_PARAM_PROB,
1020 ICMP6_PARAMPROB_HEADER,
1021 erroff + opt + 1 - opthead);
1024 optlen = IP6OPT_RTALERT_LEN;
1025 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1026 *rtalertp = ntohs(rtalert_val);
1029 /* XXX may need check for alignment */
1030 if (hbhlen < IP6OPT_JUMBO_LEN) {
1031 ip6stat.ip6s_toosmall++;
1034 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1036 icmp6_error(m, ICMP6_PARAM_PROB,
1037 ICMP6_PARAMPROB_HEADER,
1038 erroff + opt + 1 - opthead);
1041 optlen = IP6OPT_JUMBO_LEN;
1044 * IPv6 packets that have non 0 payload length
1045 * must not contain a jumbo payload option.
1047 ip6 = mtod(m, struct ip6_hdr *);
1048 if (ip6->ip6_plen) {
1049 ip6stat.ip6s_badoptions++;
1050 icmp6_error(m, ICMP6_PARAM_PROB,
1051 ICMP6_PARAMPROB_HEADER,
1052 erroff + opt - opthead);
1057 * We may see jumbolen in unaligned location, so
1058 * we'd need to perform bcopy().
1060 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1061 jumboplen = (u_int32_t)htonl(jumboplen);
1065 * if there are multiple jumbo payload options,
1066 * *plenp will be non-zero and the packet will be
1068 * the behavior may need some debate in ipngwg -
1069 * multiple options does not make sense, however,
1070 * there's no explicit mention in specification.
1073 ip6stat.ip6s_badoptions++;
1074 icmp6_error(m, ICMP6_PARAM_PROB,
1075 ICMP6_PARAMPROB_HEADER,
1076 erroff + opt + 2 - opthead);
1082 * jumbo payload length must be larger than 65535.
1084 if (jumboplen <= IPV6_MAXPACKET) {
1085 ip6stat.ip6s_badoptions++;
1086 icmp6_error(m, ICMP6_PARAM_PROB,
1087 ICMP6_PARAMPROB_HEADER,
1088 erroff + opt + 2 - opthead);
1094 default: /* unknown option */
1095 if (hbhlen < IP6OPT_MINLEN) {
1096 ip6stat.ip6s_toosmall++;
1099 optlen = ip6_unknown_opt(opt, m,
1100 erroff + opt - opthead);
1116 * Unknown option processing.
1117 * The third argument `off' is the offset from the IPv6 header to the option,
1118 * which is necessary if the IPv6 header the and option header and IPv6 header
1119 * is not continuous in order to return an ICMPv6 error.
1122 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1124 struct ip6_hdr *ip6;
1126 switch (IP6OPT_TYPE(*optp)) {
1127 case IP6OPT_TYPE_SKIP: /* ignore the option */
1128 return ((int)*(optp + 1));
1129 case IP6OPT_TYPE_DISCARD: /* silently discard */
1132 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1133 ip6stat.ip6s_badoptions++;
1134 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1136 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1137 ip6stat.ip6s_badoptions++;
1138 ip6 = mtod(m, struct ip6_hdr *);
1139 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1140 (m->m_flags & (M_BCAST|M_MCAST)))
1143 icmp6_error(m, ICMP6_PARAM_PROB,
1144 ICMP6_PARAMPROB_OPTION, off);
1148 m_freem(m); /* XXX: NOTREACHED */
1153 * Create the "control" list for this pcb.
1154 * The function will not modify mbuf chain at all.
1156 * with KAME mbuf chain restriction:
1157 * The routine will be called from upper layer handlers like tcp6_input().
1158 * Thus the routine assumes that the caller (tcp6_input) have already
1159 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1160 * very first mbuf on the mbuf chain.
1163 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1166 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1167 struct thread *td = curthread; /* XXX */
1171 if (priv_check(td, PRIV_ROOT) == 0)
1175 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1179 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1180 SCM_TIMESTAMP, SOL_SOCKET);
1182 mp = &(*mp)->m_next;
1187 /* RFC 2292 sec. 5 */
1188 if (in6p->in6p_flags & IN6P_PKTINFO) {
1189 struct in6_pktinfo pi6;
1190 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1191 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1192 pi6.ipi6_addr.s6_addr16[1] = 0;
1193 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1194 ? m->m_pkthdr.rcvif->if_index
1196 *mp = sbcreatecontrol((caddr_t) &pi6,
1197 sizeof(struct in6_pktinfo), IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO),
1200 mp = &(*mp)->m_next;
1203 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1204 int hlim = ip6->ip6_hlim & 0xff;
1205 *mp = sbcreatecontrol((caddr_t) &hlim,
1206 sizeof(int), IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1208 mp = &(*mp)->m_next;
1211 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1215 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1218 tclass = flowinfo & 0xff;
1219 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1220 IPV6_TCLASS, IPPROTO_IPV6);
1222 mp = &(*mp)->m_next;
1226 * IPV6_HOPOPTS socket option. We require super-user privilege
1227 * for the option, but it might be too strict, since there might
1228 * be some hop-by-hop options which can be returned to normal user.
1229 * See RFC 2292 section 6.
1231 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1233 * Check if a hop-by-hop options header is contatined in the
1234 * received packet, and if so, store the options as ancillary
1235 * data. Note that a hop-by-hop options header must be
1236 * just after the IPv6 header, which fact is assured through
1237 * the IPv6 input processing.
1239 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1240 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1241 struct ip6_hbh *hbh;
1243 #ifdef PULLDOWN_TEST
1247 #ifndef PULLDOWN_TEST
1248 hbh = (struct ip6_hbh *)(ip6 + 1);
1249 hbhlen = (hbh->ip6h_len + 1) << 3;
1251 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1254 ip6stat.ip6s_tooshort++;
1257 hbh = mtod(ext, struct ip6_hbh *);
1258 hbhlen = (hbh->ip6h_len + 1) << 3;
1259 if (hbhlen != ext->m_len) {
1261 ip6stat.ip6s_tooshort++;
1267 * XXX: We copy whole the header even if a jumbo
1268 * payload option is included, which option is to
1269 * be removed before returning in the RFC 2292.
1270 * Note: this constraint is removed in 2292bis.
1272 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1273 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), IPPROTO_IPV6);
1275 mp = &(*mp)->m_next;
1276 #ifdef PULLDOWN_TEST
1282 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1283 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1284 int proto, off, nxt;
1287 * go through the header chain to see if a routing header is
1288 * contained in the packet. We need this information to store
1289 * destination options headers (if any) properly.
1290 * XXX: performance issue. We should record this info when
1291 * processing extension headers in incoming routine.
1294 proto = IPPROTO_IPV6;
1300 newoff = ip6_nexthdr(m, off, proto, &nxt);
1303 if (newoff < off) /* invalid, check for safety */
1305 if ((proto = nxt) == IPPROTO_ROUTING)
1311 if ((in6p->in6p_flags &
1312 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1313 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1314 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1317 * Search for destination options headers or routing
1318 * header(s) through the header chain, and stores each
1319 * header as ancillary data.
1320 * Note that the order of the headers remains in
1321 * the chain of ancillary data.
1323 while (1) { /* is explicit loop prevention necessary? */
1324 struct ip6_ext *ip6e = NULL;
1326 #ifdef PULLDOWN_TEST
1327 struct mbuf *ext = NULL;
1331 * if it is not an extension header, don't try to
1332 * pull it from the chain.
1335 case IPPROTO_DSTOPTS:
1336 case IPPROTO_ROUTING:
1337 case IPPROTO_HOPOPTS:
1338 case IPPROTO_AH: /* is it possible? */
1344 #ifndef PULLDOWN_TEST
1345 if (off + sizeof(*ip6e) > m->m_len)
1347 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1348 if (nxt == IPPROTO_AH)
1349 elen = (ip6e->ip6e_len + 2) << 2;
1351 elen = (ip6e->ip6e_len + 1) << 3;
1352 if (off + elen > m->m_len)
1355 ext = ip6_pullexthdr(m, off, nxt);
1357 ip6stat.ip6s_tooshort++;
1360 ip6e = mtod(ext, struct ip6_ext *);
1361 if (nxt == IPPROTO_AH)
1362 elen = (ip6e->ip6e_len + 2) << 2;
1364 elen = (ip6e->ip6e_len + 1) << 3;
1365 if (elen != ext->m_len) {
1367 ip6stat.ip6s_tooshort++;
1373 case IPPROTO_DSTOPTS:
1374 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1378 * We also require super-user privilege for
1380 * See the comments on IN6_HOPOPTS.
1385 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1386 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1389 mp = &(*mp)->m_next;
1391 case IPPROTO_ROUTING:
1392 if (!(in6p->in6p_flags & IN6P_RTHDR))
1395 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1396 IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1399 mp = &(*mp)->m_next;
1401 case IPPROTO_HOPOPTS:
1402 case IPPROTO_AH: /* is it possible? */
1407 * other cases have been filtered in the above.
1408 * none will visit this case. here we supply
1409 * the code just in case (nxt overwritten or
1412 #ifdef PULLDOWN_TEST
1419 /* proceed with the next header. */
1421 nxt = ip6e->ip6e_nxt;
1423 #ifdef PULLDOWN_TEST
1435 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1439 struct ip6_mtuinfo mtuctl;
1441 so = in6p->inp_socket;
1447 if (so == NULL) /* I believe this is impossible */
1448 panic("ip6_notify_pmtu: socket is NULL");
1451 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1452 mtuctl.ip6m_mtu = *mtu;
1453 mtuctl.ip6m_addr = *dst;
1455 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1456 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1459 lwkt_gettoken(&so->so_rcv.ssb_token);
1460 if (sbappendaddr(&so->so_rcv.sb, (struct sockaddr *)dst, NULL, m_mtu)
1463 /* XXX: should count statistics */
1467 lwkt_reltoken(&so->so_rcv.ssb_token);
1470 #ifdef PULLDOWN_TEST
1472 * pull single extension header from mbuf chain. returns single mbuf that
1473 * contains the result, or NULL on error.
1475 static struct mbuf *
1476 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1478 struct ip6_ext ip6e;
1484 case IPPROTO_DSTOPTS:
1485 case IPPROTO_ROUTING:
1486 case IPPROTO_HOPOPTS:
1487 case IPPROTO_AH: /* is it possible? */
1490 kprintf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1494 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1495 if (nxt == IPPROTO_AH)
1496 elen = (ip6e.ip6e_len + 2) << 2;
1498 elen = (ip6e.ip6e_len + 1) << 3;
1500 n = m_getb(elen, MB_DONTWAIT, MT_DATA, 0);
1505 if (elen >= M_TRAILINGSPACE(n)) {
1510 m_copydata(m, off, elen, mtod(n, caddr_t));
1517 * Get pointer to the previous header followed by the header
1518 * currently processed.
1519 * XXX: This function supposes that
1520 * M includes all headers,
1521 * the next header field and the header length field of each header
1523 * the sum of each header length equals to OFF.
1524 * Because of these assumptions, this function must be called very
1525 * carefully. Moreover, it will not be used in the near future when
1526 * we develop `neater' mechanism to process extension headers.
1529 ip6_get_prevhdr(struct mbuf *m, int off)
1531 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1533 if (off == sizeof(struct ip6_hdr))
1534 return (&ip6->ip6_nxt);
1537 struct ip6_ext *ip6e = NULL;
1540 len = sizeof(struct ip6_hdr);
1542 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1545 case IPPROTO_FRAGMENT:
1546 len += sizeof(struct ip6_frag);
1549 len += (ip6e->ip6e_len + 2) << 2;
1552 len += (ip6e->ip6e_len + 1) << 3;
1555 nxt = ip6e->ip6e_nxt;
1558 return (&ip6e->ip6e_nxt);
1565 * get next header offset. m will be retained.
1568 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1571 struct ip6_ext ip6e;
1576 panic("ip6_nexthdr: m == NULL");
1577 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1582 if (m->m_pkthdr.len < off + sizeof(ip6))
1584 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1586 *nxtp = ip6.ip6_nxt;
1590 case IPPROTO_FRAGMENT:
1592 * terminate parsing if it is not the first fragment,
1593 * it does not make sense to parse through it.
1595 if (m->m_pkthdr.len < off + sizeof(fh))
1597 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1598 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1599 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1602 *nxtp = fh.ip6f_nxt;
1603 off += sizeof(struct ip6_frag);
1607 if (m->m_pkthdr.len < off + sizeof(ip6e))
1609 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1611 *nxtp = ip6e.ip6e_nxt;
1612 off += (ip6e.ip6e_len + 2) << 2;
1615 case IPPROTO_HOPOPTS:
1616 case IPPROTO_ROUTING:
1617 case IPPROTO_DSTOPTS:
1618 if (m->m_pkthdr.len < off + sizeof(ip6e))
1620 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1622 *nxtp = ip6e.ip6e_nxt;
1623 off += (ip6e.ip6e_len + 1) << 3;
1628 case IPPROTO_IPCOMP:
1640 * get offset for the last header in the chain. m will be kept untainted.
1643 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1653 newoff = ip6_nexthdr(m, off, proto, nxtp);
1656 else if (newoff < off)
1657 return -1; /* invalid */
1658 else if (newoff == off)
1667 ip6_addaux(struct mbuf *m)
1669 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1671 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1672 sizeof (struct ip6aux),
1675 m_tag_prepend(m, tag);
1678 bzero(m_tag_data(tag), sizeof (struct ip6aux));
1679 return tag ? (struct ip6aux *)m_tag_data(tag) : NULL;
1683 ip6_findaux(struct mbuf *m)
1685 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1686 return tag ? (struct ip6aux*)(tag+1) : NULL;
1690 ip6_delaux(struct mbuf *m)
1692 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1694 m_tag_delete(m, tag);
1698 * System control for IP6
1701 u_char inet6ctlerrmap[PRC_NCMDS] = {
1703 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1704 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1705 EMSGSIZE, EHOSTUNREACH, 0, 0,