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"
67 #include "opt_ipsec.h"
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/malloc.h>
73 #include <sys/domain.h>
74 #include <sys/protosw.h>
75 #include <sys/socket.h>
76 #include <sys/socketvar.h>
77 #include <sys/errno.h>
79 #include <sys/kernel.h>
80 #include <sys/syslog.h>
85 #include <net/if_types.h>
86 #include <net/if_dl.h>
87 #include <net/route.h>
88 #include <net/netisr.h>
91 #include <sys/thread2.h>
92 #include <sys/msgport2.h>
93 #include <net/netmsg2.h>
94 #include <net/netisr2.h>
96 #include <netinet/in.h>
97 #include <netinet/in_systm.h>
99 #include <netinet/ip.h>
100 #include <netinet/ip_icmp.h>
102 #include <netinet/ip6.h>
103 #include <netinet6/in6_var.h>
104 #include <netinet6/ip6_var.h>
105 #include <netinet/in_pcb.h>
106 #include <netinet/icmp6.h>
107 #include <netinet6/scope6_var.h>
108 #include <netinet6/in6_ifattach.h>
109 #include <netinet6/nd6.h>
112 #include <netinet6/ipsec.h>
114 #include <netinet6/ipsec6.h>
119 #include <netproto/ipsec/ipsec.h>
120 #include <netproto/ipsec/ipsec6.h>
122 #endif /* FAST_IPSEC */
124 #include <net/ip6fw/ip6_fw.h>
126 #include <netinet6/ip6protosw.h>
128 #include <net/net_osdep.h>
130 extern struct domain inet6domain;
131 extern struct protosw inet6sw[];
133 u_char ip6_protox[IPPROTO_MAX];
134 struct in6_ifaddr *in6_ifaddr;
136 int ip6_forward_srcrt; /* XXX */
137 int ip6_sourcecheck; /* XXX */
138 int ip6_sourcecheck_interval; /* XXX */
140 int ip6_ours_check_algorithm;
142 struct pfil_head inet6_pfil_hook;
145 ip6_fw_chk_t *ip6_fw_chk_ptr;
146 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
147 int ip6_fw_enable = 1;
149 struct ip6stat ip6stat;
151 static void ip6_init2 (void *);
152 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
153 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
154 static void ip6_input(netmsg_t msg);
156 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
158 static void transport6_processing_handler(netmsg_t netmsg);
161 * IP6 initialization: fill in IP6 protocol switch table.
162 * All protocols not implemented in kernel go to raw IP6 protocol handler.
171 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
174 for (i = 0; i < IPPROTO_MAX; i++)
175 ip6_protox[i] = pr - inet6sw;
176 for (pr = inet6domain.dom_protosw;
177 pr < inet6domain.dom_protoswNPROTOSW; pr++)
178 if (pr->pr_domain->dom_family == PF_INET6 &&
179 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
180 ip6_protox[pr->pr_protocol] = pr - inet6sw;
182 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
183 inet6_pfil_hook.ph_af = AF_INET6;
184 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
185 kprintf("%s: WARNING: unable to register pfil hook, "
186 "error %d\n", __func__, i);
189 netisr_register(NETISR_IPV6, ip6_input, NULL); /* XXX hashfn */
191 addrsel_policy_init();
195 * in many cases, random() here does NOT return random number
196 * as initialization during bootstrap time occur in fixed order.
199 ip6_flow_seq = krandom() ^ tv.tv_usec;
201 ip6_desync_factor = (krandom() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
205 ip6_init2(void *dummy)
208 in6_tmpaddrtimer_init();
212 /* This must be after route_init(), which is now SI_ORDER_THIRD */
213 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
215 extern struct route_in6 ip6_forward_rt;
218 ip6_input(netmsg_t msg)
220 struct mbuf *m = msg->packet.nm_packet;
222 int off = sizeof(struct ip6_hdr), nest;
224 u_int32_t rtalert = ~0;
225 int nxt, ours = 0, rh_present = 0;
226 struct ifnet *deliverifp = NULL;
227 struct in6_addr odst;
232 * should the inner packet be considered authentic?
233 * see comment in ah4_input().
236 m->m_flags &= ~M_AUTHIPHDR;
237 m->m_flags &= ~M_AUTHIPDGM;
242 * make sure we don't have onion peering information into m_aux.
249 if (m->m_flags & M_EXT) {
251 ip6stat.ip6s_mext2m++;
253 ip6stat.ip6s_mext1++;
255 #define M2MMAX NELEM(ip6stat.ip6s_m2m)
257 if (m->m_flags & M_LOOP) {
258 ip6stat.ip6s_m2m[loif->if_index]++; /* XXX */
259 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
260 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
262 ip6stat.ip6s_m2m[0]++;
268 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
269 ip6stat.ip6s_total++;
271 #ifndef PULLDOWN_TEST
273 * L2 bridge code and some other code can return mbuf chain
274 * that does not conform to KAME requirement. too bad.
275 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
277 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
280 n = m_getb(m->m_pkthdr.len, M_NOWAIT, MT_HEADER, M_PKTHDR);
285 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
286 n->m_len = n->m_pkthdr.len;
290 IP6_EXTHDR_CHECK_VOIDRET(m, 0, sizeof(struct ip6_hdr));
293 if (m->m_len < sizeof(struct ip6_hdr)) {
295 inifp = m->m_pkthdr.rcvif;
296 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
297 ip6stat.ip6s_toosmall++;
298 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
303 ip6 = mtod(m, struct ip6_hdr *);
305 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
306 ip6stat.ip6s_badvers++;
307 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
312 * Run through list of hooks for input packets.
314 * NB: Beware of the destination address changing
315 * (e.g. by NAT rewriting). When this happens,
316 * tell ip6_forward to do the right thing.
318 if (pfil_has_hooks(&inet6_pfil_hook)) {
320 if (pfil_run_hooks(&inet6_pfil_hook, &m,
321 m->m_pkthdr.rcvif, PFIL_IN)) {
324 if (m == NULL) /* consumed by filter */
326 ip6 = mtod(m, struct ip6_hdr *);
327 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
330 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
333 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
334 /* packet is dropped by traffic conditioner */
340 * Check with the firewall...
342 if (ip6_fw_enable && ip6_fw_chk_ptr) {
344 /* If ipfw says divert, we have to just drop packet */
345 /* use port as a dummy argument */
346 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
355 * Check against address spoofing/corruption.
357 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
358 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
360 * XXX: "badscope" is not very suitable for a multicast source.
362 ip6stat.ip6s_badscope++;
363 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
366 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
367 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
368 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
369 ip6stat.ip6s_badscope++;
370 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
375 * The following check is not documented in specs. A malicious
376 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
377 * and bypass security checks (act as if it was from 127.0.0.1 by using
378 * IPv6 src ::ffff:127.0.0.1). Be cautious.
380 * This check chokes if we are in an SIIT cloud. As none of BSDs
381 * support IPv4-less kernel compilation, we cannot support SIIT
382 * environment at all. So, it makes more sense for us to reject any
383 * malicious packets for non-SIIT environment, than try to do a
384 * partial support for SIIT environment.
386 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
387 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
388 ip6stat.ip6s_badscope++;
389 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
394 * Reject packets with IPv4 compatible addresses (auto tunnel).
396 * The code forbids auto tunnel relay case in RFC1933 (the check is
397 * stronger than RFC1933). We may want to re-enable it if mech-xx
398 * is revised to forbid relaying case.
400 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
401 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
402 ip6stat.ip6s_badscope++;
403 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
408 /* drop packets if interface ID portion is already filled */
409 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
410 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
411 ip6->ip6_src.s6_addr16[1]) {
412 ip6stat.ip6s_badscope++;
415 if ((IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
416 IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) &&
417 ip6->ip6_dst.s6_addr16[1]) {
418 ip6stat.ip6s_badscope++;
423 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
424 ip6->ip6_src.s6_addr16[1]
425 = htons(m->m_pkthdr.rcvif->if_index);
426 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
427 ip6->ip6_dst.s6_addr16[1]
428 = htons(m->m_pkthdr.rcvif->if_index);
433 * WARNING! For general subnet proxying the interface hw will
434 * likely filter out the multicast solicitations, so
435 * the interface must be in promiscuous mode.
437 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
439 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
440 deliverifp = m->m_pkthdr.rcvif;
447 if (ip6_forward_rt.ro_rt != NULL &&
448 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
449 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
450 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr)) {
451 ip6stat.ip6s_forward_cachehit++;
453 struct sockaddr_in6 *dst6;
455 if (ip6_forward_rt.ro_rt) {
456 /* route is down or destination is different */
457 ip6stat.ip6s_forward_cachemiss++;
458 RTFREE(ip6_forward_rt.ro_rt);
459 ip6_forward_rt.ro_rt = 0;
462 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
463 dst6 = &ip6_forward_rt.ro_dst;
464 dst6->sin6_len = sizeof(struct sockaddr_in6);
465 dst6->sin6_family = AF_INET6;
466 dst6->sin6_addr = ip6->ip6_dst;
468 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
471 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
474 * Accept the packet if the forwarding interface to the destination
475 * according to the routing table is the loopback interface,
476 * unless the associated route has a gateway.
477 * Note that this approach causes to accept a packet if there is a
478 * route to the loopback interface for the destination of the packet.
479 * But we think it's even useful in some situations, e.g. when using
480 * a special daemon which wants to intercept the packet.
482 * XXX: some OSes automatically make a cloned route for the destination
483 * of an outgoing packet. If the outgoing interface of the packet
484 * is a loopback one, the kernel would consider the packet to be
485 * accepted, even if we have no such address assinged on the interface.
486 * We check the cloned flag of the route entry to reject such cases,
487 * assuming that route entries for our own addresses are not made by
488 * cloning (it should be true because in6_addloop explicitly installs
489 * the host route). However, we might have to do an explicit check
490 * while it would be less efficient. Or, should we rather install a
491 * reject route for such a case?
493 if (ip6_forward_rt.ro_rt &&
494 (ip6_forward_rt.ro_rt->rt_flags &
495 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
497 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
500 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
504 * The check below is redundant since the comparison of
505 * the destination and the key of the rtentry has
506 * already done through looking up the routing table.
508 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
509 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
511 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
512 struct in6_ifaddr *ia6 =
513 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
516 * record address information into m_aux.
518 ip6_setdstifaddr(m, ia6);
521 * packets to a tentative, duplicated, or somehow invalid
522 * address must not be accepted.
524 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
525 /* this address is ready */
527 deliverifp = ia6->ia_ifp; /* correct? */
528 /* Count the packet in the ip address stats */
529 IFA_STAT_INC(&ia6->ia_ifa, ipackets, 1);
530 IFA_STAT_INC(&ia6->ia_ifa, ibytes, m->m_pkthdr.len);
533 /* address is not ready, so discard the packet. */
535 "ip6_input: packet to an unready address %s->%s\n",
536 ip6_sprintf(&ip6->ip6_src),
537 ip6_sprintf(&ip6->ip6_dst)));
544 * Now there is no reason to process the packet if it's not our own
545 * and we're not a router.
547 if (!ip6_forwarding) {
548 ip6stat.ip6s_cantforward++;
549 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
555 * record address information into m_aux, if we don't have one yet.
556 * note that we are unable to record it, if the address is not listed
557 * as our interface address (e.g. multicast addresses and such).
559 if (deliverifp && !ip6_getdstifaddr(m)) {
560 struct in6_ifaddr *ia6;
562 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
564 if (!ip6_setdstifaddr(m, ia6)) {
566 * XXX maybe we should drop the packet here,
567 * as we could not provide enough information
568 * to the upper layers.
575 * Process Hop-by-Hop options header if it's contained.
576 * m may be modified in ip6_hopopts_input().
577 * If a JumboPayload option is included, plen will also be modified.
579 plen = (u_int32_t)ntohs(ip6->ip6_plen);
580 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
583 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
584 #if 0 /*touches NULL pointer*/
585 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
587 goto bad2; /* m have already been freed */
591 ip6 = mtod(m, struct ip6_hdr *);
594 * if the payload length field is 0 and the next header field
595 * indicates Hop-by-Hop Options header, then a Jumbo Payload
596 * option MUST be included.
598 if (ip6->ip6_plen == 0 && plen == 0) {
600 * Note that if a valid jumbo payload option is
601 * contained, ip6_hoptops_input() must set a valid
602 * (non-zero) payload length to the variable plen.
604 ip6stat.ip6s_badoptions++;
605 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
606 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
607 icmp6_error(m, ICMP6_PARAM_PROB,
608 ICMP6_PARAMPROB_HEADER,
609 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
612 #ifndef PULLDOWN_TEST
613 /* ip6_hopopts_input() ensures that mbuf is contiguous */
614 hbh = (struct ip6_hbh *)(ip6 + 1);
616 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
617 sizeof(struct ip6_hbh));
619 ip6stat.ip6s_tooshort++;
626 * If we are acting as a router and the packet contains a
627 * router alert option, see if we know the option value.
628 * Currently, we only support the option value for MLD, in which
629 * case we should pass the packet to the multicast routing
632 if (rtalert != ~0 && ip6_forwarding) {
634 case IP6OPT_RTALERT_MLD:
639 * RFC2711 requires unrecognized values must be
649 * Check that the amount of data in the buffers
650 * is as at least much as the IPv6 header would have us expect.
651 * Trim mbufs if longer than we expect.
652 * Drop packet if shorter than we expect.
654 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
655 ip6stat.ip6s_tooshort++;
656 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
659 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
660 if (m->m_len == m->m_pkthdr.len) {
661 m->m_len = sizeof(struct ip6_hdr) + plen;
662 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
664 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
668 * Forward if desirable.
670 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
672 * If we are acting as a multicast router, all
673 * incoming multicast packets are passed to the
674 * kernel-level multicast forwarding function.
675 * The packet is returned (relatively) intact; if
676 * ip6_mforward() returns a non-zero value, the packet
677 * must be discarded, else it may be accepted below.
679 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
680 ip6stat.ip6s_cantforward++;
686 ip6_forward(m, srcrt);
690 ip6 = mtod(m, struct ip6_hdr *);
693 * Malicious party may be able to use IPv4 mapped addr to confuse
694 * tcp/udp stack and bypass security checks (act as if it was from
695 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
697 * For SIIT end node behavior, you may want to disable the check.
698 * However, you will become vulnerable to attacks using IPv4 mapped
701 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
702 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
703 ip6stat.ip6s_badscope++;
704 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
709 * Tell launch routine the next header
711 ip6stat.ip6s_delivered++;
712 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
716 while (nxt != IPPROTO_DONE) {
719 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
720 ip6stat.ip6s_toomanyhdr++;
721 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
726 * protection against faulty packet - there should be
727 * more sanity checks in header chain processing.
729 if (m->m_pkthdr.len < off) {
730 ip6stat.ip6s_tooshort++;
731 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
737 * do we need to do it for every header? yeah, other
738 * functions can play with it (like re-allocate and copy).
740 mhist = ip6_addaux(m);
741 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
742 hist = mtod(mhist, caddr_t) + mhist->m_len;
743 bcopy(&nxt, hist, sizeof(nxt));
744 mhist->m_len += sizeof(nxt);
746 ip6stat.ip6s_toomanyhdr++;
751 if (nxt == IPPROTO_ROUTING) {
753 in6_ifstat_inc(m->m_pkthdr.rcvif,
755 ip6stat.ip6s_badoptions++;
760 sw6 = &inet6sw[ip6_protox[nxt]];
763 * enforce IPsec policy checking if we are seeing last header.
764 * note that we do not visit this with protocols with pcb layer
765 * code - like udp/tcp/raw ip.
767 if ((sw6->pr_flags & PR_LASTHDR) && ipsec6_in_reject(m, NULL)) {
768 ipsec6stat.in_polvio++;
773 * If this is a terminal header forward to the port, otherwise
774 * process synchronously for more headers.
776 if (sw6->pr_flags & PR_LASTHDR) {
777 struct netmsg_packet *pmsg;
780 port = netisr_cpuport(0); /* XXX */
781 if ((m->m_flags & M_HASH) == 0)
782 m_sethash(m, 0); /* XXX */
784 KKASSERT(port != NULL);
785 pmsg = &m->m_hdr.mh_netmsg;
786 netmsg_init(&pmsg->base, NULL,
787 &netisr_apanic_rport,
788 0, transport6_processing_handler);
791 pmsg->base.lmsg.u.ms_result = off;
792 lwkt_sendmsg(port, &pmsg->base.lmsg);
796 nxt = sw6->pr_input(&m, &off, nxt);
804 /* msg was embedded in the mbuf, do not reply! */
808 * We have to call the pr_input() function from the correct protocol
809 * thread. The sw6->pr_soport() request at the end of ip6_input()
810 * returns the port and we forward a netmsg to the port to execute
814 transport6_processing_handler(netmsg_t netmsg)
816 struct netmsg_packet *pmsg = (struct netmsg_packet *)netmsg;
821 sw6 = &inet6sw[ip6_protox[pmsg->nm_nxt]];
822 hlen = pmsg->base.lmsg.u.ms_result;
824 nxt = sw6->pr_input(&pmsg->nm_packet, &hlen, pmsg->nm_nxt);
825 KKASSERT(nxt == IPPROTO_DONE);
826 /* netmsg was embedded in the mbuf, do not reply! */
830 * set/grab in6_ifaddr correspond to IPv6 destination address.
831 * XXX backward compatibility wrapper
833 static struct ip6aux *
834 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
840 n->ip6a_dstia6 = ia6;
841 return n; /* NULL if failed to set */
845 ip6_getdstifaddr(struct mbuf *m)
851 return n->ip6a_dstia6;
857 * Hop-by-Hop options header processing. If a valid jumbo payload option is
858 * included, the real payload length will be stored in plenp.
861 ip6_hopopts_input(u_int32_t *plenp,
862 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
866 struct mbuf *m = *mp;
867 int off = *offp, hbhlen;
870 /* validation of the length of the header */
871 #ifndef PULLDOWN_TEST
872 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
873 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
874 hbhlen = (hbh->ip6h_len + 1) << 3;
876 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
877 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
879 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
880 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
882 ip6stat.ip6s_tooshort++;
885 hbhlen = (hbh->ip6h_len + 1) << 3;
886 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
889 ip6stat.ip6s_tooshort++;
894 hbhlen -= sizeof(struct ip6_hbh);
896 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
897 hbhlen, rtalertp, plenp) < 0)
906 * Search header for all Hop-by-hop options and process each option.
907 * This function is separate from ip6_hopopts_input() in order to
908 * handle a case where the sending node itself process its hop-by-hop
909 * options header. In such a case, the function is called from ip6_output().
911 * The function assumes that hbh header is located right after the IPv6 header
912 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
913 * opthead + hbhlen is located in continuous memory region.
916 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
917 u_int32_t *rtalertp, u_int32_t *plenp)
921 u_int8_t *opt = opthead;
922 u_int16_t rtalert_val;
924 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
926 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
932 if (hbhlen < IP6OPT_MINLEN) {
933 ip6stat.ip6s_toosmall++;
936 optlen = *(opt + 1) + 2;
939 /* XXX may need check for alignment */
940 if (hbhlen < IP6OPT_RTALERT_LEN) {
941 ip6stat.ip6s_toosmall++;
944 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
946 icmp6_error(m, ICMP6_PARAM_PROB,
947 ICMP6_PARAMPROB_HEADER,
948 erroff + opt + 1 - opthead);
951 optlen = IP6OPT_RTALERT_LEN;
952 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
953 *rtalertp = ntohs(rtalert_val);
956 /* XXX may need check for alignment */
957 if (hbhlen < IP6OPT_JUMBO_LEN) {
958 ip6stat.ip6s_toosmall++;
961 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
963 icmp6_error(m, ICMP6_PARAM_PROB,
964 ICMP6_PARAMPROB_HEADER,
965 erroff + opt + 1 - opthead);
968 optlen = IP6OPT_JUMBO_LEN;
971 * IPv6 packets that have non 0 payload length
972 * must not contain a jumbo payload option.
974 ip6 = mtod(m, struct ip6_hdr *);
976 ip6stat.ip6s_badoptions++;
977 icmp6_error(m, ICMP6_PARAM_PROB,
978 ICMP6_PARAMPROB_HEADER,
979 erroff + opt - opthead);
984 * We may see jumbolen in unaligned location, so
985 * we'd need to perform bcopy().
987 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
988 jumboplen = (u_int32_t)htonl(jumboplen);
992 * if there are multiple jumbo payload options,
993 * *plenp will be non-zero and the packet will be
995 * the behavior may need some debate in ipngwg -
996 * multiple options does not make sense, however,
997 * there's no explicit mention in specification.
1000 ip6stat.ip6s_badoptions++;
1001 icmp6_error(m, ICMP6_PARAM_PROB,
1002 ICMP6_PARAMPROB_HEADER,
1003 erroff + opt + 2 - opthead);
1009 * jumbo payload length must be larger than 65535.
1011 if (jumboplen <= IPV6_MAXPACKET) {
1012 ip6stat.ip6s_badoptions++;
1013 icmp6_error(m, ICMP6_PARAM_PROB,
1014 ICMP6_PARAMPROB_HEADER,
1015 erroff + opt + 2 - opthead);
1021 default: /* unknown option */
1022 if (hbhlen < IP6OPT_MINLEN) {
1023 ip6stat.ip6s_toosmall++;
1026 optlen = ip6_unknown_opt(opt, m,
1027 erroff + opt - opthead);
1043 * Unknown option processing.
1044 * The third argument `off' is the offset from the IPv6 header to the option,
1045 * which is necessary if the IPv6 header the and option header and IPv6 header
1046 * is not continuous in order to return an ICMPv6 error.
1049 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1051 struct ip6_hdr *ip6;
1053 switch (IP6OPT_TYPE(*optp)) {
1054 case IP6OPT_TYPE_SKIP: /* ignore the option */
1055 return ((int)*(optp + 1));
1056 case IP6OPT_TYPE_DISCARD: /* silently discard */
1059 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1060 ip6stat.ip6s_badoptions++;
1061 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1063 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1064 ip6stat.ip6s_badoptions++;
1065 ip6 = mtod(m, struct ip6_hdr *);
1066 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1067 (m->m_flags & (M_BCAST|M_MCAST)))
1070 icmp6_error(m, ICMP6_PARAM_PROB,
1071 ICMP6_PARAMPROB_OPTION, off);
1075 m_freem(m); /* XXX: NOTREACHED */
1080 * Create the "control" list for this pcb.
1081 * The function will not modify mbuf chain at all.
1083 * with KAME mbuf chain restriction:
1084 * The routine will be called from upper layer handlers like tcp6_input().
1085 * Thus the routine assumes that the caller (tcp6_input) have already
1086 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1087 * very first mbuf on the mbuf chain.
1090 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1093 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1094 struct thread *td = curthread; /* XXX */
1098 if (priv_check(td, PRIV_ROOT) == 0)
1102 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1106 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv),
1107 SCM_TIMESTAMP, SOL_SOCKET);
1109 mp = &(*mp)->m_next;
1114 /* RFC 2292 sec. 5 */
1115 if (in6p->in6p_flags & IN6P_PKTINFO) {
1116 struct in6_pktinfo pi6;
1118 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1119 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1120 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) ?
1121 m->m_pkthdr.rcvif->if_index : 0;
1122 *mp = sbcreatecontrol((caddr_t)&pi6, sizeof(struct in6_pktinfo),
1123 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1125 mp = &(*mp)->m_next;
1128 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1129 int hlim = ip6->ip6_hlim & 0xff;
1131 *mp = sbcreatecontrol((caddr_t)&hlim, sizeof(int),
1132 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1134 mp = &(*mp)->m_next;
1137 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1141 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1144 tclass = flowinfo & 0xff;
1145 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1146 IPV6_TCLASS, IPPROTO_IPV6);
1148 mp = &(*mp)->m_next;
1152 * IPV6_HOPOPTS socket option. We require super-user privilege
1153 * for the option, but it might be too strict, since there might
1154 * be some hop-by-hop options which can be returned to normal user.
1155 * See RFC 2292 section 6.
1157 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1159 * Check if a hop-by-hop options header is contatined in the
1160 * received packet, and if so, store the options as ancillary
1161 * data. Note that a hop-by-hop options header must be
1162 * just after the IPv6 header, which is assured through the
1163 * IPv6 input processing.
1165 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1166 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1167 struct ip6_hbh *hbh;
1169 #ifdef PULLDOWN_TEST
1173 #ifndef PULLDOWN_TEST
1174 hbh = (struct ip6_hbh *)(ip6 + 1);
1175 hbhlen = (hbh->ip6h_len + 1) << 3;
1177 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1180 ip6stat.ip6s_tooshort++;
1183 hbh = mtod(ext, struct ip6_hbh *);
1184 hbhlen = (hbh->ip6h_len + 1) << 3;
1185 if (hbhlen != ext->m_len) {
1187 ip6stat.ip6s_tooshort++;
1193 * XXX: We copy the whole header even if a
1194 * jumbo payload option is included, the option which
1195 * is to be removed before returning according to
1197 * Note: this constraint is removed in 2292bis.
1199 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1200 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1203 mp = &(*mp)->m_next;
1204 #ifdef PULLDOWN_TEST
1210 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1211 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1212 int proto, off, nxt;
1215 * go through the header chain to see if a routing header is
1216 * contained in the packet. We need this information to store
1217 * destination options headers (if any) properly.
1218 * XXX: performance issue. We should record this info when
1219 * processing extension headers in incoming routine.
1222 proto = IPPROTO_IPV6;
1228 newoff = ip6_nexthdr(m, off, proto, &nxt);
1231 if (newoff < off) /* invalid, check for safety */
1233 if ((proto = nxt) == IPPROTO_ROUTING)
1239 if ((in6p->in6p_flags &
1240 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1241 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1242 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1245 * Search for destination options headers or routing
1246 * header(s) through the header chain, and stores each
1247 * header as ancillary data.
1248 * Note that the order of the headers remains in
1249 * the chain of ancillary data.
1251 while (1) { /* is explicit loop prevention necessary? */
1252 struct ip6_ext *ip6e = NULL;
1254 #ifdef PULLDOWN_TEST
1255 struct mbuf *ext = NULL;
1259 * if it is not an extension header, don't try to
1260 * pull it from the chain.
1263 case IPPROTO_DSTOPTS:
1264 case IPPROTO_ROUTING:
1265 case IPPROTO_HOPOPTS:
1266 case IPPROTO_AH: /* is it possible? */
1272 #ifndef PULLDOWN_TEST
1273 if (off + sizeof(*ip6e) > m->m_len)
1275 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1276 if (nxt == IPPROTO_AH)
1277 elen = (ip6e->ip6e_len + 2) << 2;
1279 elen = (ip6e->ip6e_len + 1) << 3;
1280 if (off + elen > m->m_len)
1283 ext = ip6_pullexthdr(m, off, nxt);
1285 ip6stat.ip6s_tooshort++;
1288 ip6e = mtod(ext, struct ip6_ext *);
1289 if (nxt == IPPROTO_AH)
1290 elen = (ip6e->ip6e_len + 2) << 2;
1292 elen = (ip6e->ip6e_len + 1) << 3;
1293 if (elen != ext->m_len) {
1295 ip6stat.ip6s_tooshort++;
1301 case IPPROTO_DSTOPTS:
1302 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1306 * We also require super-user privilege for
1307 * the option. See comments on IN6_HOPOPTS.
1312 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1313 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1316 mp = &(*mp)->m_next;
1318 case IPPROTO_ROUTING:
1319 if (!(in6p->in6p_flags & IN6P_RTHDR))
1322 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1323 IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1326 mp = &(*mp)->m_next;
1328 case IPPROTO_HOPOPTS:
1329 case IPPROTO_AH: /* is it possible? */
1334 * other cases have been filtered in the above.
1335 * none will visit this case. here we supply
1336 * the code just in case (nxt overwritten or
1339 #ifdef PULLDOWN_TEST
1346 /* proceed with the next header. */
1348 nxt = ip6e->ip6e_nxt;
1350 #ifdef PULLDOWN_TEST
1362 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1366 struct ip6_mtuinfo mtuctl;
1368 so = in6p->inp_socket;
1374 if (so == NULL) /* I believe this is impossible */
1375 panic("ip6_notify_pmtu: socket is NULL");
1378 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1379 mtuctl.ip6m_mtu = *mtu;
1380 mtuctl.ip6m_addr = *dst;
1382 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1383 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1386 lwkt_gettoken(&so->so_rcv.ssb_token);
1387 if (sbappendaddr(&so->so_rcv.sb, (struct sockaddr *)dst, NULL, m_mtu)
1390 /* XXX: should count statistics */
1394 lwkt_reltoken(&so->so_rcv.ssb_token);
1397 #ifdef PULLDOWN_TEST
1399 * pull single extension header from mbuf chain. returns single mbuf that
1400 * contains the result, or NULL on error.
1402 static struct mbuf *
1403 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1405 struct ip6_ext ip6e;
1411 case IPPROTO_DSTOPTS:
1412 case IPPROTO_ROUTING:
1413 case IPPROTO_HOPOPTS:
1414 case IPPROTO_AH: /* is it possible? */
1417 kprintf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1421 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1422 if (nxt == IPPROTO_AH)
1423 elen = (ip6e.ip6e_len + 2) << 2;
1425 elen = (ip6e.ip6e_len + 1) << 3;
1427 n = m_getb(elen, M_NOWAIT, MT_DATA, 0);
1432 if (elen >= M_TRAILINGSPACE(n)) {
1437 m_copydata(m, off, elen, mtod(n, caddr_t));
1444 * Get pointer to the previous header followed by the header
1445 * currently processed.
1446 * XXX: This function supposes that
1447 * M includes all headers,
1448 * the next header field and the header length field of each header
1450 * the sum of each header length equals to OFF.
1451 * Because of these assumptions, this function must be called very
1452 * carefully. Moreover, it will not be used in the near future when
1453 * we develop `neater' mechanism to process extension headers.
1456 ip6_get_prevhdr(struct mbuf *m, int off)
1458 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1460 if (off == sizeof(struct ip6_hdr))
1461 return (&ip6->ip6_nxt);
1464 struct ip6_ext *ip6e = NULL;
1467 len = sizeof(struct ip6_hdr);
1469 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1472 case IPPROTO_FRAGMENT:
1473 len += sizeof(struct ip6_frag);
1476 len += (ip6e->ip6e_len + 2) << 2;
1479 len += (ip6e->ip6e_len + 1) << 3;
1482 nxt = ip6e->ip6e_nxt;
1485 return (&ip6e->ip6e_nxt);
1492 * get next header offset. m will be retained.
1495 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1498 struct ip6_ext ip6e;
1503 panic("ip6_nexthdr: m == NULL");
1504 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1509 if (m->m_pkthdr.len < off + sizeof(ip6))
1511 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1513 *nxtp = ip6.ip6_nxt;
1517 case IPPROTO_FRAGMENT:
1519 * terminate parsing if it is not the first fragment,
1520 * it does not make sense to parse through it.
1522 if (m->m_pkthdr.len < off + sizeof(fh))
1524 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1525 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1526 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1529 *nxtp = fh.ip6f_nxt;
1530 off += sizeof(struct ip6_frag);
1534 if (m->m_pkthdr.len < off + sizeof(ip6e))
1536 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1538 *nxtp = ip6e.ip6e_nxt;
1539 off += (ip6e.ip6e_len + 2) << 2;
1542 case IPPROTO_HOPOPTS:
1543 case IPPROTO_ROUTING:
1544 case IPPROTO_DSTOPTS:
1545 if (m->m_pkthdr.len < off + sizeof(ip6e))
1547 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1549 *nxtp = ip6e.ip6e_nxt;
1550 off += (ip6e.ip6e_len + 1) << 3;
1555 case IPPROTO_IPCOMP:
1567 * get offset for the last header in the chain. m will be kept untainted.
1570 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1580 newoff = ip6_nexthdr(m, off, proto, nxtp);
1583 else if (newoff < off)
1584 return -1; /* invalid */
1585 else if (newoff == off)
1594 ip6_addaux(struct mbuf *m)
1598 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1600 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
1603 m_tag_prepend(m, mtag);
1606 bzero(m_tag_data(mtag), sizeof(struct ip6aux));
1607 return mtag ? (struct ip6aux *)m_tag_data(mtag) : NULL;
1611 ip6_findaux(struct mbuf *m)
1615 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1616 return mtag ? (struct ip6aux *)m_tag_data(mtag) : NULL;
1620 ip6_delaux(struct mbuf *m)
1624 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1626 m_tag_delete(m, mtag);
1630 * System control for IP6
1633 u_char inet6ctlerrmap[PRC_NCMDS] = {
1635 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1636 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1637 EMSGSIZE, EHOSTUNREACH, 0, 0,