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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61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
64 #include "opt_ip6fw.h"
66 #include "opt_inet6.h"
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/malloc.h>
72 #include <sys/domain.h>
73 #include <sys/protosw.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/errno.h>
78 #include <sys/kernel.h>
79 #include <sys/syslog.h>
84 #include <net/if_types.h>
85 #include <net/if_dl.h>
86 #include <net/route.h>
87 #include <net/netisr.h>
90 #include <sys/msgport2.h>
91 #include <net/netmsg2.h>
92 #include <net/netisr2.h>
94 #include <netinet/in.h>
95 #include <netinet/in_systm.h>
97 #include <netinet/ip.h>
98 #include <netinet/ip_icmp.h>
100 #include <netinet/ip6.h>
101 #include <netinet6/in6_var.h>
102 #include <netinet6/ip6_var.h>
103 #include <netinet/in_pcb.h>
104 #include <netinet/icmp6.h>
105 #include <netinet6/scope6_var.h>
106 #include <netinet6/in6_ifattach.h>
107 #include <netinet6/nd6.h>
109 #include <net/ip6fw/ip6_fw.h>
111 #include <netinet6/ip6protosw.h>
113 #include <net/net_osdep.h>
115 extern struct domain inet6domain;
116 extern struct protosw inet6sw[];
118 u_char ip6_protox[IPPROTO_MAX];
119 struct in6_ifaddr *in6_ifaddr;
121 int ip6_forward_srcrt; /* XXX */
122 int ip6_sourcecheck; /* XXX */
123 int ip6_sourcecheck_interval; /* XXX */
125 int ip6_ours_check_algorithm;
127 struct pfil_head inet6_pfil_hook;
130 ip6_fw_chk_t *ip6_fw_chk_ptr;
131 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
132 int ip6_fw_enable = 1;
134 struct ip6stat ip6stat;
136 static void ip6_init2 (void *);
137 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
138 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
139 static void ip6_input(netmsg_t msg);
141 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
143 static void transport6_processing_handler(netmsg_t netmsg);
146 * IP6 initialization: fill in IP6 protocol switch table.
147 * All protocols not implemented in kernel go to raw IP6 protocol handler.
156 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
159 for (i = 0; i < IPPROTO_MAX; i++)
160 ip6_protox[i] = pr - inet6sw;
161 for (pr = inet6domain.dom_protosw;
162 pr < inet6domain.dom_protoswNPROTOSW; pr++)
163 if (pr->pr_domain->dom_family == PF_INET6 &&
164 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
165 ip6_protox[pr->pr_protocol] = pr - inet6sw;
167 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
168 inet6_pfil_hook.ph_af = AF_INET6;
169 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
170 kprintf("%s: WARNING: unable to register pfil hook, "
171 "error %d\n", __func__, i);
174 netisr_register(NETISR_IPV6, ip6_input, NULL); /* XXX hashfn */
176 addrsel_policy_init();
180 * in many cases, random() here does NOT return random number
181 * as initialization during bootstrap time occur in fixed order.
184 ip6_flow_seq = krandom() ^ tv.tv_usec;
186 ip6_desync_factor = (krandom() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
190 ip6_init2(void *dummy)
193 in6_tmpaddrtimer_init();
197 /* This must be after route_init(), which is now SI_ORDER_THIRD */
198 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
200 extern struct route_in6 ip6_forward_rt;
203 ip6_input(netmsg_t msg)
205 struct mbuf *m = msg->packet.nm_packet;
207 int off = sizeof(struct ip6_hdr), nest;
209 u_int32_t rtalert = ~0;
210 int nxt, ours = 0, rh_present = 0;
211 struct ifnet *deliverifp = NULL;
212 struct in6_addr odst;
216 * make sure we don't have onion peering information into m_aux.
223 if (m->m_flags & M_EXT) {
225 ip6stat.ip6s_mext2m++;
227 ip6stat.ip6s_mext1++;
229 #define M2MMAX NELEM(ip6stat.ip6s_m2m)
231 if (m->m_flags & M_LOOP) {
232 ip6stat.ip6s_m2m[loif->if_index]++; /* XXX */
233 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
234 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
236 ip6stat.ip6s_m2m[0]++;
242 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
243 ip6stat.ip6s_total++;
245 #ifndef PULLDOWN_TEST
247 * L2 bridge code and some other code can return mbuf chain
248 * that does not conform to KAME requirement. too bad.
249 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
251 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
254 n = m_getb(m->m_pkthdr.len, M_NOWAIT, MT_HEADER, M_PKTHDR);
259 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
260 n->m_len = n->m_pkthdr.len;
264 IP6_EXTHDR_CHECK_VOIDRET(m, 0, sizeof(struct ip6_hdr));
267 if (m->m_len < sizeof(struct ip6_hdr)) {
269 inifp = m->m_pkthdr.rcvif;
270 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
271 ip6stat.ip6s_toosmall++;
272 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
277 ip6 = mtod(m, struct ip6_hdr *);
279 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
280 ip6stat.ip6s_badvers++;
281 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
286 * Run through list of hooks for input packets.
288 * NB: Beware of the destination address changing
289 * (e.g. by NAT rewriting). When this happens,
290 * tell ip6_forward to do the right thing.
292 if (pfil_has_hooks(&inet6_pfil_hook)) {
294 if (pfil_run_hooks(&inet6_pfil_hook, &m,
295 m->m_pkthdr.rcvif, PFIL_IN)) {
298 if (m == NULL) /* consumed by filter */
300 ip6 = mtod(m, struct ip6_hdr *);
301 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
304 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
307 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
308 /* packet is dropped by traffic conditioner */
314 * Check with the firewall...
316 if (ip6_fw_enable && ip6_fw_chk_ptr) {
318 /* If ipfw says divert, we have to just drop packet */
319 /* use port as a dummy argument */
320 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
329 * Check against address spoofing/corruption.
331 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
332 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
334 * XXX: "badscope" is not very suitable for a multicast source.
336 ip6stat.ip6s_badscope++;
337 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
340 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
341 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
342 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
343 ip6stat.ip6s_badscope++;
344 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
349 * The following check is not documented in specs. A malicious
350 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
351 * and bypass security checks (act as if it was from 127.0.0.1 by using
352 * IPv6 src ::ffff:127.0.0.1). Be cautious.
354 * This check chokes if we are in an SIIT cloud. As none of BSDs
355 * support IPv4-less kernel compilation, we cannot support SIIT
356 * environment at all. So, it makes more sense for us to reject any
357 * malicious packets for non-SIIT environment, than try to do a
358 * partial support for SIIT environment.
360 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
361 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
362 ip6stat.ip6s_badscope++;
363 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
368 * Reject packets with IPv4 compatible addresses (auto tunnel).
370 * The code forbids auto tunnel relay case in RFC1933 (the check is
371 * stronger than RFC1933). We may want to re-enable it if mech-xx
372 * is revised to forbid relaying case.
374 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
375 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
376 ip6stat.ip6s_badscope++;
377 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
382 /* drop packets if interface ID portion is already filled */
383 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
384 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
385 ip6->ip6_src.s6_addr16[1]) {
386 ip6stat.ip6s_badscope++;
389 if ((IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
390 IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) &&
391 ip6->ip6_dst.s6_addr16[1]) {
392 ip6stat.ip6s_badscope++;
397 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
398 ip6->ip6_src.s6_addr16[1]
399 = htons(m->m_pkthdr.rcvif->if_index);
400 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
401 ip6->ip6_dst.s6_addr16[1]
402 = htons(m->m_pkthdr.rcvif->if_index);
407 * WARNING! For general subnet proxying the interface hw will
408 * likely filter out the multicast solicitations, so
409 * the interface must be in promiscuous mode.
411 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
413 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
414 deliverifp = m->m_pkthdr.rcvif;
421 if (ip6_forward_rt.ro_rt != NULL &&
422 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
423 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
424 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr)) {
425 ip6stat.ip6s_forward_cachehit++;
427 struct sockaddr_in6 *dst6;
429 if (ip6_forward_rt.ro_rt) {
430 /* route is down or destination is different */
431 ip6stat.ip6s_forward_cachemiss++;
432 RTFREE(ip6_forward_rt.ro_rt);
433 ip6_forward_rt.ro_rt = 0;
436 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
437 dst6 = &ip6_forward_rt.ro_dst;
438 dst6->sin6_len = sizeof(struct sockaddr_in6);
439 dst6->sin6_family = AF_INET6;
440 dst6->sin6_addr = ip6->ip6_dst;
442 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
445 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
448 * Accept the packet if the forwarding interface to the destination
449 * according to the routing table is the loopback interface,
450 * unless the associated route has a gateway.
451 * Note that this approach causes to accept a packet if there is a
452 * route to the loopback interface for the destination of the packet.
453 * But we think it's even useful in some situations, e.g. when using
454 * a special daemon which wants to intercept the packet.
456 * XXX: some OSes automatically make a cloned route for the destination
457 * of an outgoing packet. If the outgoing interface of the packet
458 * is a loopback one, the kernel would consider the packet to be
459 * accepted, even if we have no such address assinged on the interface.
460 * We check the cloned flag of the route entry to reject such cases,
461 * assuming that route entries for our own addresses are not made by
462 * cloning (it should be true because in6_addloop explicitly installs
463 * the host route). However, we might have to do an explicit check
464 * while it would be less efficient. Or, should we rather install a
465 * reject route for such a case?
467 if (ip6_forward_rt.ro_rt &&
468 (ip6_forward_rt.ro_rt->rt_flags &
469 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
471 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
474 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
478 * The check below is redundant since the comparison of
479 * the destination and the key of the rtentry has
480 * already done through looking up the routing table.
482 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
483 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
485 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
486 struct in6_ifaddr *ia6 =
487 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
490 * record address information into m_aux.
492 ip6_setdstifaddr(m, ia6);
495 * packets to a tentative, duplicated, or somehow invalid
496 * address must not be accepted.
498 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
499 /* this address is ready */
501 deliverifp = ia6->ia_ifp; /* correct? */
502 /* Count the packet in the ip address stats */
503 IFA_STAT_INC(&ia6->ia_ifa, ipackets, 1);
504 IFA_STAT_INC(&ia6->ia_ifa, ibytes, m->m_pkthdr.len);
507 /* address is not ready, so discard the packet. */
509 "ip6_input: packet to an unready address %s->%s\n",
510 ip6_sprintf(&ip6->ip6_src),
511 ip6_sprintf(&ip6->ip6_dst)));
518 * Now there is no reason to process the packet if it's not our own
519 * and we're not a router.
521 if (!ip6_forwarding) {
522 ip6stat.ip6s_cantforward++;
523 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
529 * record address information into m_aux, if we don't have one yet.
530 * note that we are unable to record it, if the address is not listed
531 * as our interface address (e.g. multicast addresses and such).
533 if (deliverifp && !ip6_getdstifaddr(m)) {
534 struct in6_ifaddr *ia6;
536 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
538 if (!ip6_setdstifaddr(m, ia6)) {
540 * XXX maybe we should drop the packet here,
541 * as we could not provide enough information
542 * to the upper layers.
549 * Process Hop-by-Hop options header if it's contained.
550 * m may be modified in ip6_hopopts_input().
551 * If a JumboPayload option is included, plen will also be modified.
553 plen = (u_int32_t)ntohs(ip6->ip6_plen);
554 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
557 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
558 #if 0 /*touches NULL pointer*/
559 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
561 goto bad2; /* m have already been freed */
565 ip6 = mtod(m, struct ip6_hdr *);
568 * if the payload length field is 0 and the next header field
569 * indicates Hop-by-Hop Options header, then a Jumbo Payload
570 * option MUST be included.
572 if (ip6->ip6_plen == 0 && plen == 0) {
574 * Note that if a valid jumbo payload option is
575 * contained, ip6_hoptops_input() must set a valid
576 * (non-zero) payload length to the variable plen.
578 ip6stat.ip6s_badoptions++;
579 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
580 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
581 icmp6_error(m, ICMP6_PARAM_PROB,
582 ICMP6_PARAMPROB_HEADER,
583 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
586 #ifndef PULLDOWN_TEST
587 /* ip6_hopopts_input() ensures that mbuf is contiguous */
588 hbh = (struct ip6_hbh *)(ip6 + 1);
590 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
591 sizeof(struct ip6_hbh));
593 ip6stat.ip6s_tooshort++;
600 * If we are acting as a router and the packet contains a
601 * router alert option, see if we know the option value.
602 * Currently, we only support the option value for MLD, in which
603 * case we should pass the packet to the multicast routing
606 if (rtalert != ~0 && ip6_forwarding) {
608 case IP6OPT_RTALERT_MLD:
613 * RFC2711 requires unrecognized values must be
623 * Check that the amount of data in the buffers
624 * is as at least much as the IPv6 header would have us expect.
625 * Trim mbufs if longer than we expect.
626 * Drop packet if shorter than we expect.
628 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
629 ip6stat.ip6s_tooshort++;
630 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
633 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
634 if (m->m_len == m->m_pkthdr.len) {
635 m->m_len = sizeof(struct ip6_hdr) + plen;
636 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
638 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
642 * Forward if desirable.
644 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
646 * If we are acting as a multicast router, all
647 * incoming multicast packets are passed to the
648 * kernel-level multicast forwarding function.
649 * The packet is returned (relatively) intact; if
650 * ip6_mforward() returns a non-zero value, the packet
651 * must be discarded, else it may be accepted below.
653 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
654 ip6stat.ip6s_cantforward++;
660 ip6_forward(m, srcrt);
664 ip6 = mtod(m, struct ip6_hdr *);
667 * Malicious party may be able to use IPv4 mapped addr to confuse
668 * tcp/udp stack and bypass security checks (act as if it was from
669 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
671 * For SIIT end node behavior, you may want to disable the check.
672 * However, you will become vulnerable to attacks using IPv4 mapped
675 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
676 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
677 ip6stat.ip6s_badscope++;
678 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
683 * Tell launch routine the next header
685 ip6stat.ip6s_delivered++;
686 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
690 while (nxt != IPPROTO_DONE) {
693 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
694 ip6stat.ip6s_toomanyhdr++;
695 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
700 * protection against faulty packet - there should be
701 * more sanity checks in header chain processing.
703 if (m->m_pkthdr.len < off) {
704 ip6stat.ip6s_tooshort++;
705 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
711 * do we need to do it for every header? yeah, other
712 * functions can play with it (like re-allocate and copy).
714 mhist = ip6_addaux(m);
715 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
716 hist = mtod(mhist, caddr_t) + mhist->m_len;
717 bcopy(&nxt, hist, sizeof(nxt));
718 mhist->m_len += sizeof(nxt);
720 ip6stat.ip6s_toomanyhdr++;
725 if (nxt == IPPROTO_ROUTING) {
727 in6_ifstat_inc(m->m_pkthdr.rcvif,
729 ip6stat.ip6s_badoptions++;
734 sw6 = &inet6sw[ip6_protox[nxt]];
736 * If this is a terminal header forward to the port, otherwise
737 * process synchronously for more headers.
739 if (sw6->pr_flags & PR_LASTHDR) {
740 struct netmsg_packet *pmsg;
743 port = netisr_cpuport(0); /* XXX */
744 if ((m->m_flags & M_HASH) == 0)
745 m_sethash(m, 0); /* XXX */
747 KKASSERT(port != NULL);
748 pmsg = &m->m_hdr.mh_netmsg;
749 netmsg_init(&pmsg->base, NULL,
750 &netisr_apanic_rport,
751 0, transport6_processing_handler);
754 pmsg->base.lmsg.u.ms_result = off;
755 lwkt_sendmsg(port, &pmsg->base.lmsg);
759 nxt = sw6->pr_input(&m, &off, nxt);
767 /* msg was embedded in the mbuf, do not reply! */
771 * We have to call the pr_input() function from the correct protocol
772 * thread. The sw6->pr_soport() request at the end of ip6_input()
773 * returns the port and we forward a netmsg to the port to execute
777 transport6_processing_handler(netmsg_t netmsg)
779 struct netmsg_packet *pmsg = (struct netmsg_packet *)netmsg;
784 sw6 = &inet6sw[ip6_protox[pmsg->nm_nxt]];
785 hlen = pmsg->base.lmsg.u.ms_result;
787 nxt = sw6->pr_input(&pmsg->nm_packet, &hlen, pmsg->nm_nxt);
788 KKASSERT(nxt == IPPROTO_DONE);
789 /* netmsg was embedded in the mbuf, do not reply! */
793 * set/grab in6_ifaddr correspond to IPv6 destination address.
794 * XXX backward compatibility wrapper
796 static struct ip6aux *
797 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
803 n->ip6a_dstia6 = ia6;
804 return n; /* NULL if failed to set */
808 ip6_getdstifaddr(struct mbuf *m)
814 return n->ip6a_dstia6;
820 * Hop-by-Hop options header processing. If a valid jumbo payload option is
821 * included, the real payload length will be stored in plenp.
824 ip6_hopopts_input(u_int32_t *plenp,
825 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
829 struct mbuf *m = *mp;
830 int off = *offp, hbhlen;
833 /* validation of the length of the header */
834 #ifndef PULLDOWN_TEST
835 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
836 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
837 hbhlen = (hbh->ip6h_len + 1) << 3;
839 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
840 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
842 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
843 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
845 ip6stat.ip6s_tooshort++;
848 hbhlen = (hbh->ip6h_len + 1) << 3;
849 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
852 ip6stat.ip6s_tooshort++;
857 hbhlen -= sizeof(struct ip6_hbh);
859 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
860 hbhlen, rtalertp, plenp) < 0)
869 * Search header for all Hop-by-hop options and process each option.
870 * This function is separate from ip6_hopopts_input() in order to
871 * handle a case where the sending node itself process its hop-by-hop
872 * options header. In such a case, the function is called from ip6_output().
874 * The function assumes that hbh header is located right after the IPv6 header
875 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
876 * opthead + hbhlen is located in continuous memory region.
879 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
880 u_int32_t *rtalertp, u_int32_t *plenp)
884 u_int8_t *opt = opthead;
885 u_int16_t rtalert_val;
887 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
889 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
895 if (hbhlen < IP6OPT_MINLEN) {
896 ip6stat.ip6s_toosmall++;
899 optlen = *(opt + 1) + 2;
902 /* XXX may need check for alignment */
903 if (hbhlen < IP6OPT_RTALERT_LEN) {
904 ip6stat.ip6s_toosmall++;
907 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
909 icmp6_error(m, ICMP6_PARAM_PROB,
910 ICMP6_PARAMPROB_HEADER,
911 erroff + opt + 1 - opthead);
914 optlen = IP6OPT_RTALERT_LEN;
915 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
916 *rtalertp = ntohs(rtalert_val);
919 /* XXX may need check for alignment */
920 if (hbhlen < IP6OPT_JUMBO_LEN) {
921 ip6stat.ip6s_toosmall++;
924 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
926 icmp6_error(m, ICMP6_PARAM_PROB,
927 ICMP6_PARAMPROB_HEADER,
928 erroff + opt + 1 - opthead);
931 optlen = IP6OPT_JUMBO_LEN;
934 * IPv6 packets that have non 0 payload length
935 * must not contain a jumbo payload option.
937 ip6 = mtod(m, struct ip6_hdr *);
939 ip6stat.ip6s_badoptions++;
940 icmp6_error(m, ICMP6_PARAM_PROB,
941 ICMP6_PARAMPROB_HEADER,
942 erroff + opt - opthead);
947 * We may see jumbolen in unaligned location, so
948 * we'd need to perform bcopy().
950 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
951 jumboplen = (u_int32_t)htonl(jumboplen);
955 * if there are multiple jumbo payload options,
956 * *plenp will be non-zero and the packet will be
958 * the behavior may need some debate in ipngwg -
959 * multiple options does not make sense, however,
960 * there's no explicit mention in specification.
963 ip6stat.ip6s_badoptions++;
964 icmp6_error(m, ICMP6_PARAM_PROB,
965 ICMP6_PARAMPROB_HEADER,
966 erroff + opt + 2 - opthead);
972 * jumbo payload length must be larger than 65535.
974 if (jumboplen <= IPV6_MAXPACKET) {
975 ip6stat.ip6s_badoptions++;
976 icmp6_error(m, ICMP6_PARAM_PROB,
977 ICMP6_PARAMPROB_HEADER,
978 erroff + opt + 2 - opthead);
984 default: /* unknown option */
985 if (hbhlen < IP6OPT_MINLEN) {
986 ip6stat.ip6s_toosmall++;
989 optlen = ip6_unknown_opt(opt, m,
990 erroff + opt - opthead);
1006 * Unknown option processing.
1007 * The third argument `off' is the offset from the IPv6 header to the option,
1008 * which is necessary if the IPv6 header the and option header and IPv6 header
1009 * is not continuous in order to return an ICMPv6 error.
1012 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1014 struct ip6_hdr *ip6;
1016 switch (IP6OPT_TYPE(*optp)) {
1017 case IP6OPT_TYPE_SKIP: /* ignore the option */
1018 return ((int)*(optp + 1));
1019 case IP6OPT_TYPE_DISCARD: /* silently discard */
1022 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1023 ip6stat.ip6s_badoptions++;
1024 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1026 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1027 ip6stat.ip6s_badoptions++;
1028 ip6 = mtod(m, struct ip6_hdr *);
1029 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1030 (m->m_flags & (M_BCAST|M_MCAST)))
1033 icmp6_error(m, ICMP6_PARAM_PROB,
1034 ICMP6_PARAMPROB_OPTION, off);
1038 m_freem(m); /* XXX: NOTREACHED */
1043 * Create the "control" list for this pcb.
1044 * The function will not modify mbuf chain at all.
1046 * with KAME mbuf chain restriction:
1047 * The routine will be called from upper layer handlers like tcp6_input().
1048 * Thus the routine assumes that the caller (tcp6_input) have already
1049 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1050 * very first mbuf on the mbuf chain.
1053 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1056 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1057 struct thread *td = curthread; /* XXX */
1061 if (priv_check(td, PRIV_ROOT) == 0)
1065 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1069 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv),
1070 SCM_TIMESTAMP, SOL_SOCKET);
1072 mp = &(*mp)->m_next;
1077 /* RFC 2292 sec. 5 */
1078 if (in6p->in6p_flags & IN6P_PKTINFO) {
1079 struct in6_pktinfo pi6;
1081 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1082 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1083 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) ?
1084 m->m_pkthdr.rcvif->if_index : 0;
1085 *mp = sbcreatecontrol((caddr_t)&pi6, sizeof(struct in6_pktinfo),
1086 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1088 mp = &(*mp)->m_next;
1091 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1092 int hlim = ip6->ip6_hlim & 0xff;
1094 *mp = sbcreatecontrol((caddr_t)&hlim, sizeof(int),
1095 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1097 mp = &(*mp)->m_next;
1100 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1104 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1107 tclass = flowinfo & 0xff;
1108 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1109 IPV6_TCLASS, IPPROTO_IPV6);
1111 mp = &(*mp)->m_next;
1115 * IPV6_HOPOPTS socket option. We require super-user privilege
1116 * for the option, but it might be too strict, since there might
1117 * be some hop-by-hop options which can be returned to normal user.
1118 * See RFC 2292 section 6.
1120 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1122 * Check if a hop-by-hop options header is contatined in the
1123 * received packet, and if so, store the options as ancillary
1124 * data. Note that a hop-by-hop options header must be
1125 * just after the IPv6 header, which is assured through the
1126 * IPv6 input processing.
1128 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1129 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1130 struct ip6_hbh *hbh;
1132 #ifdef PULLDOWN_TEST
1136 #ifndef PULLDOWN_TEST
1137 hbh = (struct ip6_hbh *)(ip6 + 1);
1138 hbhlen = (hbh->ip6h_len + 1) << 3;
1140 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1143 ip6stat.ip6s_tooshort++;
1146 hbh = mtod(ext, struct ip6_hbh *);
1147 hbhlen = (hbh->ip6h_len + 1) << 3;
1148 if (hbhlen != ext->m_len) {
1150 ip6stat.ip6s_tooshort++;
1156 * XXX: We copy the whole header even if a
1157 * jumbo payload option is included, the option which
1158 * is to be removed before returning according to
1160 * Note: this constraint is removed in 2292bis.
1162 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1163 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1166 mp = &(*mp)->m_next;
1167 #ifdef PULLDOWN_TEST
1173 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1174 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1175 int proto, off, nxt;
1178 * go through the header chain to see if a routing header is
1179 * contained in the packet. We need this information to store
1180 * destination options headers (if any) properly.
1181 * XXX: performance issue. We should record this info when
1182 * processing extension headers in incoming routine.
1185 proto = IPPROTO_IPV6;
1191 newoff = ip6_nexthdr(m, off, proto, &nxt);
1194 if (newoff < off) /* invalid, check for safety */
1196 if ((proto = nxt) == IPPROTO_ROUTING)
1202 if ((in6p->in6p_flags &
1203 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1204 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1205 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1208 * Search for destination options headers or routing
1209 * header(s) through the header chain, and stores each
1210 * header as ancillary data.
1211 * Note that the order of the headers remains in
1212 * the chain of ancillary data.
1214 while (1) { /* is explicit loop prevention necessary? */
1215 struct ip6_ext *ip6e = NULL;
1217 #ifdef PULLDOWN_TEST
1218 struct mbuf *ext = NULL;
1222 * if it is not an extension header, don't try to
1223 * pull it from the chain.
1226 case IPPROTO_DSTOPTS:
1227 case IPPROTO_ROUTING:
1228 case IPPROTO_HOPOPTS:
1229 case IPPROTO_AH: /* is it possible? */
1235 #ifndef PULLDOWN_TEST
1236 if (off + sizeof(*ip6e) > m->m_len)
1238 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1239 if (nxt == IPPROTO_AH)
1240 elen = (ip6e->ip6e_len + 2) << 2;
1242 elen = (ip6e->ip6e_len + 1) << 3;
1243 if (off + elen > m->m_len)
1246 ext = ip6_pullexthdr(m, off, nxt);
1248 ip6stat.ip6s_tooshort++;
1251 ip6e = mtod(ext, struct ip6_ext *);
1252 if (nxt == IPPROTO_AH)
1253 elen = (ip6e->ip6e_len + 2) << 2;
1255 elen = (ip6e->ip6e_len + 1) << 3;
1256 if (elen != ext->m_len) {
1258 ip6stat.ip6s_tooshort++;
1264 case IPPROTO_DSTOPTS:
1265 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1269 * We also require super-user privilege for
1270 * the option. See comments on IN6_HOPOPTS.
1275 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1276 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1279 mp = &(*mp)->m_next;
1281 case IPPROTO_ROUTING:
1282 if (!(in6p->in6p_flags & IN6P_RTHDR))
1285 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1286 IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1289 mp = &(*mp)->m_next;
1291 case IPPROTO_HOPOPTS:
1292 case IPPROTO_AH: /* is it possible? */
1297 * other cases have been filtered in the above.
1298 * none will visit this case. here we supply
1299 * the code just in case (nxt overwritten or
1302 #ifdef PULLDOWN_TEST
1309 /* proceed with the next header. */
1311 nxt = ip6e->ip6e_nxt;
1313 #ifdef PULLDOWN_TEST
1325 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1329 struct ip6_mtuinfo mtuctl;
1331 so = in6p->inp_socket;
1337 if (so == NULL) /* I believe this is impossible */
1338 panic("ip6_notify_pmtu: socket is NULL");
1341 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1342 mtuctl.ip6m_mtu = *mtu;
1343 mtuctl.ip6m_addr = *dst;
1345 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1346 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1349 lwkt_gettoken(&so->so_rcv.ssb_token);
1350 if (sbappendaddr(&so->so_rcv.sb, (struct sockaddr *)dst, NULL, m_mtu)
1353 /* XXX: should count statistics */
1357 lwkt_reltoken(&so->so_rcv.ssb_token);
1360 #ifdef PULLDOWN_TEST
1362 * pull single extension header from mbuf chain. returns single mbuf that
1363 * contains the result, or NULL on error.
1365 static struct mbuf *
1366 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1368 struct ip6_ext ip6e;
1374 case IPPROTO_DSTOPTS:
1375 case IPPROTO_ROUTING:
1376 case IPPROTO_HOPOPTS:
1377 case IPPROTO_AH: /* is it possible? */
1380 kprintf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1384 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1385 if (nxt == IPPROTO_AH)
1386 elen = (ip6e.ip6e_len + 2) << 2;
1388 elen = (ip6e.ip6e_len + 1) << 3;
1390 n = m_getb(elen, M_NOWAIT, MT_DATA, 0);
1395 if (elen >= M_TRAILINGSPACE(n)) {
1400 m_copydata(m, off, elen, mtod(n, caddr_t));
1407 * Get pointer to the previous header followed by the header
1408 * currently processed.
1409 * XXX: This function supposes that
1410 * M includes all headers,
1411 * the next header field and the header length field of each header
1413 * the sum of each header length equals to OFF.
1414 * Because of these assumptions, this function must be called very
1415 * carefully. Moreover, it will not be used in the near future when
1416 * we develop `neater' mechanism to process extension headers.
1419 ip6_get_prevhdr(struct mbuf *m, int off)
1421 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1423 if (off == sizeof(struct ip6_hdr))
1424 return (&ip6->ip6_nxt);
1427 struct ip6_ext *ip6e = NULL;
1430 len = sizeof(struct ip6_hdr);
1432 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1435 case IPPROTO_FRAGMENT:
1436 len += sizeof(struct ip6_frag);
1439 len += (ip6e->ip6e_len + 2) << 2;
1442 len += (ip6e->ip6e_len + 1) << 3;
1445 nxt = ip6e->ip6e_nxt;
1448 return (&ip6e->ip6e_nxt);
1455 * get next header offset. m will be retained.
1458 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1461 struct ip6_ext ip6e;
1466 panic("ip6_nexthdr: m == NULL");
1467 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1472 if (m->m_pkthdr.len < off + sizeof(ip6))
1474 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1476 *nxtp = ip6.ip6_nxt;
1480 case IPPROTO_FRAGMENT:
1482 * terminate parsing if it is not the first fragment,
1483 * it does not make sense to parse through it.
1485 if (m->m_pkthdr.len < off + sizeof(fh))
1487 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1488 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1489 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1492 *nxtp = fh.ip6f_nxt;
1493 off += sizeof(struct ip6_frag);
1497 if (m->m_pkthdr.len < off + sizeof(ip6e))
1499 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1501 *nxtp = ip6e.ip6e_nxt;
1502 off += (ip6e.ip6e_len + 2) << 2;
1505 case IPPROTO_HOPOPTS:
1506 case IPPROTO_ROUTING:
1507 case IPPROTO_DSTOPTS:
1508 if (m->m_pkthdr.len < off + sizeof(ip6e))
1510 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1512 *nxtp = ip6e.ip6e_nxt;
1513 off += (ip6e.ip6e_len + 1) << 3;
1518 case IPPROTO_IPCOMP:
1530 * get offset for the last header in the chain. m will be kept untainted.
1533 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1543 newoff = ip6_nexthdr(m, off, proto, nxtp);
1546 else if (newoff < off)
1547 return -1; /* invalid */
1548 else if (newoff == off)
1557 ip6_addaux(struct mbuf *m)
1561 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1563 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
1566 m_tag_prepend(m, mtag);
1569 bzero(m_tag_data(mtag), sizeof(struct ip6aux));
1570 return mtag ? (struct ip6aux *)m_tag_data(mtag) : NULL;
1574 ip6_findaux(struct mbuf *m)
1578 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1579 return mtag ? (struct ip6aux *)m_tag_data(mtag) : NULL;
1583 ip6_delaux(struct mbuf *m)
1587 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1589 m_tag_delete(m, mtag);
1593 * System control for IP6
1596 u_char inet6ctlerrmap[PRC_NCMDS] = {
1598 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1599 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1600 EMSGSIZE, EHOSTUNREACH, 0, 0,