2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $
33 * Copyright (c) 1982, 1986, 1988, 1993
34 * The Regents of the University of California. All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
67 #include "opt_inet6.h"
68 #include "opt_ipsec.h"
70 #include <sys/param.h>
71 #include <sys/systm.h>
72 #include <sys/malloc.h>
75 #include <sys/domain.h>
76 #include <sys/protosw.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/errno.h>
81 #include <sys/kernel.h>
82 #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>
92 #include <netinet/in.h>
93 #include <netinet/in_systm.h>
94 #include <net/if_llatbl.h>
96 #include <netinet/ip.h>
97 #include <netinet/ip_icmp.h>
99 #include <netinet/ip6.h>
100 #include <netinet6/in6_var.h>
101 #include <netinet6/ip6_var.h>
102 #include <netinet/in_pcb.h>
103 #include <netinet/icmp6.h>
104 #include <netinet6/scope6_var.h>
105 #include <netinet6/in6_ifattach.h>
106 #include <netinet6/nd6.h>
109 #include <netipsec/ipsec.h>
110 #include <netinet6/ip6_ipsec.h>
111 #include <netipsec/ipsec6.h>
114 #include <netinet6/ip6protosw.h>
116 extern struct domain inet6domain;
118 u_char ip6_protox[IPPROTO_MAX];
120 static struct netisr_handler ip6_nh = {
122 .nh_handler = ip6_input,
123 .nh_proto = NETISR_IPV6,
124 .nh_policy = NETISR_POLICY_FLOW,
127 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
128 VNET_DEFINE(struct ip6stat, ip6stat);
130 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch);
131 VNET_DECLARE(int, dad_init);
132 VNET_DECLARE(int, pmtu_expire);
133 VNET_DECLARE(int, pmtu_probe);
134 VNET_DECLARE(u_long, rip6_sendspace);
135 VNET_DECLARE(u_long, rip6_recvspace);
136 VNET_DECLARE(int, icmp6errppslim);
137 VNET_DECLARE(int, icmp6_nodeinfo);
138 VNET_DECLARE(int, udp6_sendspace);
139 VNET_DECLARE(int, udp6_recvspace);
141 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
142 #define V_dad_init VNET(dad_init)
143 #define V_pmtu_expire VNET(pmtu_expire)
144 #define V_pmtu_probe VNET(pmtu_probe)
145 #define V_rip6_sendspace VNET(rip6_sendspace)
146 #define V_rip6_recvspace VNET(rip6_recvspace)
147 #define V_icmp6errppslim VNET(icmp6errppslim)
148 #define V_icmp6_nodeinfo VNET(icmp6_nodeinfo)
149 #define V_udp6_sendspace VNET(udp6_sendspace)
150 #define V_udp6_recvspace VNET(udp6_recvspace)
152 struct rwlock in6_ifaddr_lock;
153 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
155 struct pfil_head inet6_pfil_hook;
157 static void ip6_init2(void *);
158 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *);
159 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
161 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
165 * IP6 initialization: fill in IP6 protocol switch table.
166 * All protocols not implemented in kernel go to raw IP6 protocol handler.
171 struct ip6protosw *pr;
175 #ifdef IP6_AUTO_LINKLOCAL
176 V_ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
178 V_ip6_auto_linklocal = 1; /* enable by default */
180 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
181 &V_ip6_auto_linklocal);
183 #ifndef IPV6FORWARDING
185 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */
187 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */
188 #endif /* GATEWAY6 */
189 #endif /* !IPV6FORWARDING */
191 #ifndef IPV6_SENDREDIRECTS
192 #define IPV6_SENDREDIRECTS 1
195 V_ip6_forwarding = IPV6FORWARDING; /* act as router? */
196 V_ip6_sendredirects = IPV6_SENDREDIRECTS;
197 V_ip6_defhlim = IPV6_DEFHLIM;
198 V_ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
199 V_ip6_accept_rtadv = 0; /* "IPV6FORWARDING ? 0 : 1" is dangerous */
200 V_ip6_log_interval = 5;
201 V_ip6_hdrnestlimit = 15; /* How many header options will we process? */
202 V_ip6_dad_count = 1; /* DupAddrDetectionTransmits */
203 V_ip6_auto_flowlabel = 1;
204 V_ip6_use_deprecated = 1;/* allow deprecated addr (RFC2462 5.5.4) */
205 V_ip6_rr_prune = 5; /* router renumbering prefix
206 * walk list every 5 sec. */
207 V_ip6_mcast_pmtu = 0; /* enable pMTU discovery for multicast? */
210 V_ip6_log_time = (time_t)0L;
214 V_nd6_onlink_ns_rfc4861 = 0; /* allow 'on-link' nd6 NS (RFC 4861) */
216 V_pmtu_expire = 60*10;
219 /* raw IP6 parameters */
221 * Nominal space allocated to a raw ip socket.
223 #define RIPV6SNDQ 8192
224 #define RIPV6RCVQ 8192
225 V_rip6_sendspace = RIPV6SNDQ;
226 V_rip6_recvspace = RIPV6RCVQ;
228 /* ICMPV6 parameters */
229 V_icmp6_rediraccept = 1; /* accept and process redirects */
230 V_icmp6_redirtimeout = 10 * 60; /* 10 minutes */
231 V_icmp6errppslim = 100; /* 100pps */
232 /* control how to respond to NI queries */
233 V_icmp6_nodeinfo = (ICMP6_NODEINFO_FQDNOK|ICMP6_NODEINFO_NODEADDROK);
235 /* UDP on IP6 parameters */
236 V_udp6_sendspace = 9216; /* really max datagram size */
237 V_udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
238 /* 40 1K datagrams */
241 TAILQ_INIT(&V_in6_ifaddrhead);
244 addrsel_policy_init();
248 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
250 /* Skip global initialization stuff for non-default instances. */
251 if (!IS_DEFAULT_VNET(curvnet))
255 if (sizeof(struct protosw) != sizeof(struct ip6protosw))
256 panic("sizeof(protosw) != sizeof(ip6protosw)");
258 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
262 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
263 for (i = 0; i < IPPROTO_MAX; i++)
264 ip6_protox[i] = pr - inet6sw;
266 * Cycle through IP protocols and put them into the appropriate place
269 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
270 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
271 if (pr->pr_domain->dom_family == PF_INET6 &&
272 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
273 /* Be careful to only index valid IP protocols. */
274 if (pr->pr_protocol < IPPROTO_MAX)
275 ip6_protox[pr->pr_protocol] = pr - inet6sw;
278 /* Initialize packet filter hooks. */
279 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
280 inet6_pfil_hook.ph_af = AF_INET6;
281 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0)
282 printf("%s: WARNING: unable to register pfil hook, "
283 "error %d\n", __func__, i);
285 netisr_register(&ip6_nh);
294 callout_drain(&V_in6_tmpaddrtimer_ch);
299 ip6_init2_vnet(const void *unused __unused)
303 callout_init(&V_nd6_timer_ch, 0);
304 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet);
306 /* timer for regeneranation of temporary addresses randomize ID */
307 callout_init(&V_in6_tmpaddrtimer_ch, 0);
308 callout_reset(&V_in6_tmpaddrtimer_ch,
309 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
310 V_ip6_temp_regen_advance) * hz,
311 in6_tmpaddrtimer, curvnet);
317 ip6_init2(void *dummy)
320 ip6_init2_vnet(NULL);
324 /* This must be after route_init(), which is now SI_ORDER_THIRD */
325 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
328 ip6_input(struct mbuf *m)
331 int off = sizeof(struct ip6_hdr), nest;
333 u_int32_t rtalert = ~0;
335 struct ifnet *deliverifp = NULL, *ifp = NULL;
336 struct in6_addr odst;
337 struct route_in6 rin6;
339 struct llentry *lle = NULL;
340 struct sockaddr_in6 dst6, *dst;
342 bzero(&rin6, sizeof(struct route_in6));
345 * should the inner packet be considered authentic?
346 * see comment in ah4_input().
347 * NB: m cannot be NULL when passed to the input routine
350 m->m_flags &= ~M_AUTHIPHDR;
351 m->m_flags &= ~M_AUTHIPDGM;
356 * make sure we don't have onion peering information into m_tag.
363 if (m->m_flags & M_EXT) {
365 V_ip6stat.ip6s_mext2m++;
367 V_ip6stat.ip6s_mext1++;
369 #define M2MMAX (sizeof(V_ip6stat.ip6s_m2m)/sizeof(V_ip6stat.ip6s_m2m[0]))
371 if (m->m_flags & M_LOOP) {
372 V_ip6stat.ip6s_m2m[V_loif->if_index]++;
373 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
374 V_ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
376 V_ip6stat.ip6s_m2m[0]++;
382 /* drop the packet if IPv6 operation is disabled on the IF */
383 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
388 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
389 V_ip6stat.ip6s_total++;
391 #ifndef PULLDOWN_TEST
393 * L2 bridge code and some other code can return mbuf chain
394 * that does not conform to KAME requirement. too bad.
395 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
397 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
400 MGETHDR(n, M_DONTWAIT, MT_HEADER);
403 if (n && n->m_pkthdr.len > MHLEN) {
404 MCLGET(n, M_DONTWAIT);
405 if ((n->m_flags & M_EXT) == 0) {
412 return; /* ENOBUFS */
415 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
416 n->m_len = n->m_pkthdr.len;
420 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */);
423 if (m->m_len < sizeof(struct ip6_hdr)) {
425 inifp = m->m_pkthdr.rcvif;
426 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
427 V_ip6stat.ip6s_toosmall++;
428 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
433 ip6 = mtod(m, struct ip6_hdr *);
435 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
436 V_ip6stat.ip6s_badvers++;
437 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
441 V_ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
444 * Check against address spoofing/corruption.
446 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
447 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
449 * XXX: "badscope" is not very suitable for a multicast source.
451 V_ip6stat.ip6s_badscope++;
452 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
455 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
456 !(m->m_flags & M_LOOP)) {
458 * In this case, the packet should come from the loopback
459 * interface. However, we cannot just check the if_flags,
460 * because ip6_mloopback() passes the "actual" interface
461 * as the outgoing/incoming interface.
463 V_ip6stat.ip6s_badscope++;
464 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
469 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
470 /* packet is dropped by traffic conditioner */
475 * The following check is not documented in specs. A malicious
476 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
477 * and bypass security checks (act as if it was from 127.0.0.1 by using
478 * IPv6 src ::ffff:127.0.0.1). Be cautious.
480 * This check chokes if we are in an SIIT cloud. As none of BSDs
481 * support IPv4-less kernel compilation, we cannot support SIIT
482 * environment at all. So, it makes more sense for us to reject any
483 * malicious packets for non-SIIT environment, than try to do a
484 * partial support for SIIT environment.
486 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
487 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
488 V_ip6stat.ip6s_badscope++;
489 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
494 * Reject packets with IPv4 compatible addresses (auto tunnel).
496 * The code forbids auto tunnel relay case in RFC1933 (the check is
497 * stronger than RFC1933). We may want to re-enable it if mech-xx
498 * is revised to forbid relaying case.
500 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
501 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
502 V_ip6stat.ip6s_badscope++;
503 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
509 * Run through list of hooks for input packets.
511 * NB: Beware of the destination address changing
512 * (e.g. by NAT rewriting). When this happens,
513 * tell ip6_forward to do the right thing.
517 /* Jump over all PFIL processing if hooks are not active. */
518 if (!PFIL_HOOKED(&inet6_pfil_hook))
521 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, PFIL_IN, NULL))
523 if (m == NULL) /* consumed by filter */
525 ip6 = mtod(m, struct ip6_hdr *);
526 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
530 * Disambiguate address scope zones (if there is ambiguity).
531 * We first make sure that the original source or destination address
532 * is not in our internal form for scoped addresses. Such addresses
533 * are not necessarily invalid spec-wise, but we cannot accept them due
534 * to the usage conflict.
535 * in6_setscope() then also checks and rejects the cases where src or
536 * dst are the loopback address and the receiving interface
539 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
540 V_ip6stat.ip6s_badscope++; /* XXX */
543 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
544 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
545 V_ip6stat.ip6s_badscope++;
550 * Multicast check. Assume packet is for us to avoid
551 * prematurely taking locks.
553 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
555 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
556 deliverifp = m->m_pkthdr.rcvif;
564 bzero(&dst6, sizeof(dst6));
565 dst6.sin6_family = AF_INET6;
566 dst6.sin6_len = sizeof(struct sockaddr_in6);
567 dst6.sin6_addr = ip6->ip6_dst;
568 ifp = m->m_pkthdr.rcvif;
570 lle = lla_lookup(LLTABLE6(ifp), 0,
571 (struct sockaddr *)&dst6);
572 IF_AFDATA_UNLOCK(ifp);
573 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) {
583 dst->sin6_len = sizeof(struct sockaddr_in6);
584 dst->sin6_family = AF_INET6;
585 dst->sin6_addr = ip6->ip6_dst;
586 rin6.ro_rt = rtalloc1((struct sockaddr *)dst, 0, 0);
588 RT_UNLOCK(rin6.ro_rt);
590 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
593 * Accept the packet if the forwarding interface to the destination
594 * according to the routing table is the loopback interface,
595 * unless the associated route has a gateway.
596 * Note that this approach causes to accept a packet if there is a
597 * route to the loopback interface for the destination of the packet.
598 * But we think it's even useful in some situations, e.g. when using
599 * a special daemon which wants to intercept the packet.
601 * XXX: some OSes automatically make a cloned route for the destination
602 * of an outgoing packet. If the outgoing interface of the packet
603 * is a loopback one, the kernel would consider the packet to be
604 * accepted, even if we have no such address assinged on the interface.
605 * We check the cloned flag of the route entry to reject such cases,
606 * assuming that route entries for our own addresses are not made by
607 * cloning (it should be true because in6_addloop explicitly installs
608 * the host route). However, we might have to do an explicit check
609 * while it would be less efficient. Or, should we rather install a
610 * reject route for such a case?
613 (rin6.ro_rt->rt_flags &
614 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
616 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) &&
619 !(rin6.ro_rt->rt_flags & RTF_CLONED) &&
623 * The check below is redundant since the comparison of
624 * the destination and the key of the rtentry has
625 * already done through looking up the routing table.
627 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
628 &rt6_key(rin6.ro_rt)->sin6_addr)
630 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) {
632 struct in6_ifaddr *ia6;
635 * found the loopback route to the interface address
637 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) {
638 struct sockaddr_in6 dest6;
640 bzero(&dest6, sizeof(dest6));
641 dest6.sin6_family = AF_INET6;
642 dest6.sin6_len = sizeof(dest6);
643 dest6.sin6_addr = ip6->ip6_dst;
644 ia6 = (struct in6_ifaddr *)
645 ifa_ifwithaddr((struct sockaddr *)&dest6);
651 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa;
654 * record address information into m_tag.
656 (void)ip6_setdstifaddr(m, ia6);
659 * packets to a tentative, duplicated, or somehow invalid
660 * address must not be accepted.
662 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
663 /* this address is ready */
665 deliverifp = ia6->ia_ifp; /* correct? */
666 /* Count the packet in the ip address stats */
667 ia6->ia_ifa.if_ipackets++;
668 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
669 if (ia6 != NULL && free_ia6 != 0)
670 ifa_free(&ia6->ia_ifa);
673 char ip6bufs[INET6_ADDRSTRLEN];
674 char ip6bufd[INET6_ADDRSTRLEN];
675 /* address is not ready, so discard the packet. */
677 "ip6_input: packet to an unready address %s->%s\n",
678 ip6_sprintf(ip6bufs, &ip6->ip6_src),
679 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
681 if (ia6 != NULL && free_ia6 != 0)
682 ifa_free(&ia6->ia_ifa);
688 * FAITH (Firewall Aided Internet Translator)
690 if (V_ip6_keepfaith) {
691 if (rin6.ro_rt && rin6.ro_rt->rt_ifp &&
692 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) {
693 /* XXX do we need more sanity checks? */
695 deliverifp = rin6.ro_rt->rt_ifp; /* faith */
701 * Now there is no reason to process the packet if it's not our own
702 * and we're not a router.
704 if (!V_ip6_forwarding) {
705 V_ip6stat.ip6s_cantforward++;
706 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
712 * record address information into m_tag, if we don't have one yet.
713 * note that we are unable to record it, if the address is not listed
714 * as our interface address (e.g. multicast addresses, addresses
715 * within FAITH prefixes and such).
717 if (deliverifp && !ip6_getdstifaddr(m)) {
718 struct in6_ifaddr *ia6;
720 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
722 if (!ip6_setdstifaddr(m, ia6)) {
724 * XXX maybe we should drop the packet here,
725 * as we could not provide enough information
726 * to the upper layers.
729 ifa_free(&ia6->ia_ifa);
734 * Process Hop-by-Hop options header if it's contained.
735 * m may be modified in ip6_hopopts_input().
736 * If a JumboPayload option is included, plen will also be modified.
738 plen = (u_int32_t)ntohs(ip6->ip6_plen);
739 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
742 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
743 #if 0 /*touches NULL pointer*/
744 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
746 goto out; /* m have already been freed */
750 ip6 = mtod(m, struct ip6_hdr *);
753 * if the payload length field is 0 and the next header field
754 * indicates Hop-by-Hop Options header, then a Jumbo Payload
755 * option MUST be included.
757 if (ip6->ip6_plen == 0 && plen == 0) {
759 * Note that if a valid jumbo payload option is
760 * contained, ip6_hopopts_input() must set a valid
761 * (non-zero) payload length to the variable plen.
763 V_ip6stat.ip6s_badoptions++;
764 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
765 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
766 icmp6_error(m, ICMP6_PARAM_PROB,
767 ICMP6_PARAMPROB_HEADER,
768 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
771 #ifndef PULLDOWN_TEST
772 /* ip6_hopopts_input() ensures that mbuf is contiguous */
773 hbh = (struct ip6_hbh *)(ip6 + 1);
775 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
776 sizeof(struct ip6_hbh));
778 V_ip6stat.ip6s_tooshort++;
785 * If we are acting as a router and the packet contains a
786 * router alert option, see if we know the option value.
787 * Currently, we only support the option value for MLD, in which
788 * case we should pass the packet to the multicast routing
793 case IP6OPT_RTALERT_MLD:
794 if (V_ip6_forwarding)
799 * RFC2711 requires unrecognized values must be
809 * Check that the amount of data in the buffers
810 * is as at least much as the IPv6 header would have us expect.
811 * Trim mbufs if longer than we expect.
812 * Drop packet if shorter than we expect.
814 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
815 V_ip6stat.ip6s_tooshort++;
816 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
819 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
820 if (m->m_len == m->m_pkthdr.len) {
821 m->m_len = sizeof(struct ip6_hdr) + plen;
822 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
824 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
828 * Forward if desirable.
831 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
833 * If we are acting as a multicast router, all
834 * incoming multicast packets are passed to the
835 * kernel-level multicast forwarding function.
836 * The packet is returned (relatively) intact; if
837 * ip6_mforward() returns a non-zero value, the packet
838 * must be discarded, else it may be accepted below.
840 * XXX TODO: Check hlim and multicast scope here to avoid
841 * unnecessarily calling into ip6_mforward().
844 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
845 IP6STAT_INC(ip6s_cantforward);
846 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
850 ip6_forward(m, srcrt);
854 ip6 = mtod(m, struct ip6_hdr *);
857 * Malicious party may be able to use IPv4 mapped addr to confuse
858 * tcp/udp stack and bypass security checks (act as if it was from
859 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
861 * For SIIT end node behavior, you may want to disable the check.
862 * However, you will become vulnerable to attacks using IPv4 mapped
865 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
866 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
867 V_ip6stat.ip6s_badscope++;
868 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
873 * Tell launch routine the next header
875 V_ip6stat.ip6s_delivered++;
876 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
879 while (nxt != IPPROTO_DONE) {
880 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
881 V_ip6stat.ip6s_toomanyhdr++;
886 * protection against faulty packet - there should be
887 * more sanity checks in header chain processing.
889 if (m->m_pkthdr.len < off) {
890 V_ip6stat.ip6s_tooshort++;
891 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
897 * enforce IPsec policy checking if we are seeing last header.
898 * note that we do not visit this with protocols with pcb layer
899 * code - like udp/tcp/raw ip.
901 if (ip6_ipsec_input(m, nxt))
906 * Use mbuf flags to propagate Router Alert option to
907 * ICMPv6 layer, as hop-by-hop options have been stripped.
909 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0)
910 m->m_flags |= M_RTALERT_MLD;
912 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
923 * set/grab in6_ifaddr correspond to IPv6 destination address.
924 * XXX backward compatibility wrapper
926 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag,
927 * and then bump it when the tag is copied, and release it when the tag is
928 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead
929 * we just bump the ia refcount when we receive it. This should be fixed.
931 static struct ip6aux *
932 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
936 ip6a = ip6_addaux(m);
938 ip6a->ip6a_dstia6 = ia6;
939 return ip6a; /* NULL if failed to set */
943 ip6_getdstifaddr(struct mbuf *m)
946 struct in6_ifaddr *ia;
948 ip6a = ip6_findaux(m);
950 ia = ip6a->ip6a_dstia6;
951 ifa_ref(&ia->ia_ifa);
958 * Hop-by-Hop options header processing. If a valid jumbo payload option is
959 * included, the real payload length will be stored in plenp.
961 * rtalertp - XXX: should be stored more smart way
964 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
965 struct mbuf **mp, int *offp)
967 struct mbuf *m = *mp;
968 int off = *offp, hbhlen;
972 /* validation of the length of the header */
973 #ifndef PULLDOWN_TEST
974 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
975 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
976 hbhlen = (hbh->ip6h_len + 1) << 3;
978 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
979 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
981 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
982 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
984 V_ip6stat.ip6s_tooshort++;
987 hbhlen = (hbh->ip6h_len + 1) << 3;
988 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
991 V_ip6stat.ip6s_tooshort++;
996 hbhlen -= sizeof(struct ip6_hbh);
997 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
999 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
1000 hbhlen, rtalertp, plenp) < 0)
1009 * Search header for all Hop-by-hop options and process each option.
1010 * This function is separate from ip6_hopopts_input() in order to
1011 * handle a case where the sending node itself process its hop-by-hop
1012 * options header. In such a case, the function is called from ip6_output().
1014 * The function assumes that hbh header is located right after the IPv6 header
1015 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
1016 * opthead + hbhlen is located in continuous memory region.
1019 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1020 u_int32_t *rtalertp, u_int32_t *plenp)
1022 struct ip6_hdr *ip6;
1024 u_int8_t *opt = opthead;
1025 u_int16_t rtalert_val;
1026 u_int32_t jumboplen;
1027 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1029 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1035 if (hbhlen < IP6OPT_MINLEN) {
1036 V_ip6stat.ip6s_toosmall++;
1039 optlen = *(opt + 1) + 2;
1041 case IP6OPT_ROUTER_ALERT:
1042 /* XXX may need check for alignment */
1043 if (hbhlen < IP6OPT_RTALERT_LEN) {
1044 V_ip6stat.ip6s_toosmall++;
1047 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1049 icmp6_error(m, ICMP6_PARAM_PROB,
1050 ICMP6_PARAMPROB_HEADER,
1051 erroff + opt + 1 - opthead);
1054 optlen = IP6OPT_RTALERT_LEN;
1055 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1056 *rtalertp = ntohs(rtalert_val);
1059 /* XXX may need check for alignment */
1060 if (hbhlen < IP6OPT_JUMBO_LEN) {
1061 V_ip6stat.ip6s_toosmall++;
1064 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1066 icmp6_error(m, ICMP6_PARAM_PROB,
1067 ICMP6_PARAMPROB_HEADER,
1068 erroff + opt + 1 - opthead);
1071 optlen = IP6OPT_JUMBO_LEN;
1074 * IPv6 packets that have non 0 payload length
1075 * must not contain a jumbo payload option.
1077 ip6 = mtod(m, struct ip6_hdr *);
1078 if (ip6->ip6_plen) {
1079 V_ip6stat.ip6s_badoptions++;
1080 icmp6_error(m, ICMP6_PARAM_PROB,
1081 ICMP6_PARAMPROB_HEADER,
1082 erroff + opt - opthead);
1087 * We may see jumbolen in unaligned location, so
1088 * we'd need to perform bcopy().
1090 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1091 jumboplen = (u_int32_t)htonl(jumboplen);
1095 * if there are multiple jumbo payload options,
1096 * *plenp will be non-zero and the packet will be
1098 * the behavior may need some debate in ipngwg -
1099 * multiple options does not make sense, however,
1100 * there's no explicit mention in specification.
1103 V_ip6stat.ip6s_badoptions++;
1104 icmp6_error(m, ICMP6_PARAM_PROB,
1105 ICMP6_PARAMPROB_HEADER,
1106 erroff + opt + 2 - opthead);
1112 * jumbo payload length must be larger than 65535.
1114 if (jumboplen <= IPV6_MAXPACKET) {
1115 V_ip6stat.ip6s_badoptions++;
1116 icmp6_error(m, ICMP6_PARAM_PROB,
1117 ICMP6_PARAMPROB_HEADER,
1118 erroff + opt + 2 - opthead);
1124 default: /* unknown option */
1125 if (hbhlen < IP6OPT_MINLEN) {
1126 V_ip6stat.ip6s_toosmall++;
1129 optlen = ip6_unknown_opt(opt, m,
1130 erroff + opt - opthead);
1146 * Unknown option processing.
1147 * The third argument `off' is the offset from the IPv6 header to the option,
1148 * which is necessary if the IPv6 header the and option header and IPv6 header
1149 * is not continuous in order to return an ICMPv6 error.
1152 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1154 struct ip6_hdr *ip6;
1156 switch (IP6OPT_TYPE(*optp)) {
1157 case IP6OPT_TYPE_SKIP: /* ignore the option */
1158 return ((int)*(optp + 1));
1159 case IP6OPT_TYPE_DISCARD: /* silently discard */
1162 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1163 V_ip6stat.ip6s_badoptions++;
1164 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1166 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1167 V_ip6stat.ip6s_badoptions++;
1168 ip6 = mtod(m, struct ip6_hdr *);
1169 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1170 (m->m_flags & (M_BCAST|M_MCAST)))
1173 icmp6_error(m, ICMP6_PARAM_PROB,
1174 ICMP6_PARAMPROB_OPTION, off);
1178 m_freem(m); /* XXX: NOTREACHED */
1183 * Create the "control" list for this pcb.
1184 * These functions will not modify mbuf chain at all.
1186 * With KAME mbuf chain restriction:
1187 * The routine will be called from upper layer handlers like tcp6_input().
1188 * Thus the routine assumes that the caller (tcp6_input) have already
1189 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1190 * very first mbuf on the mbuf chain.
1192 * ip6_savecontrol_v4 will handle those options that are possible to be
1193 * set on a v4-mapped socket.
1194 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1195 * options and handle the v6-only ones itself.
1198 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1201 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1204 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1208 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1209 SCM_TIMESTAMP, SOL_SOCKET);
1211 mp = &(*mp)->m_next;
1215 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1221 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1222 /* RFC 2292 sec. 5 */
1223 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1224 struct in6_pktinfo pi6;
1226 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1227 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1229 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1231 *mp = sbcreatecontrol((caddr_t) &pi6,
1232 sizeof(struct in6_pktinfo),
1233 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1235 mp = &(*mp)->m_next;
1238 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1239 int hlim = ip6->ip6_hlim & 0xff;
1241 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1242 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1245 mp = &(*mp)->m_next;
1254 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
1256 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1259 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only);
1263 if ((in6p->inp_flags & IN6P_TCLASS) != 0) {
1267 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1270 tclass = flowinfo & 0xff;
1271 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1272 IPV6_TCLASS, IPPROTO_IPV6);
1274 mp = &(*mp)->m_next;
1278 * IPV6_HOPOPTS socket option. Recall that we required super-user
1279 * privilege for the option (see ip6_ctloutput), but it might be too
1280 * strict, since there might be some hop-by-hop options which can be
1281 * returned to normal user.
1282 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1284 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
1286 * Check if a hop-by-hop options header is contatined in the
1287 * received packet, and if so, store the options as ancillary
1288 * data. Note that a hop-by-hop options header must be
1289 * just after the IPv6 header, which is assured through the
1290 * IPv6 input processing.
1292 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1293 struct ip6_hbh *hbh;
1295 #ifdef PULLDOWN_TEST
1299 #ifndef PULLDOWN_TEST
1300 hbh = (struct ip6_hbh *)(ip6 + 1);
1301 hbhlen = (hbh->ip6h_len + 1) << 3;
1303 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1306 V_ip6stat.ip6s_tooshort++;
1309 hbh = mtod(ext, struct ip6_hbh *);
1310 hbhlen = (hbh->ip6h_len + 1) << 3;
1311 if (hbhlen != ext->m_len) {
1313 V_ip6stat.ip6s_tooshort++;
1319 * XXX: We copy the whole header even if a
1320 * jumbo payload option is included, the option which
1321 * is to be removed before returning according to
1323 * Note: this constraint is removed in RFC3542
1325 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1326 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1329 mp = &(*mp)->m_next;
1330 #ifdef PULLDOWN_TEST
1336 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1337 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1340 * Search for destination options headers or routing
1341 * header(s) through the header chain, and stores each
1342 * header as ancillary data.
1343 * Note that the order of the headers remains in
1344 * the chain of ancillary data.
1346 while (1) { /* is explicit loop prevention necessary? */
1347 struct ip6_ext *ip6e = NULL;
1349 #ifdef PULLDOWN_TEST
1350 struct mbuf *ext = NULL;
1354 * if it is not an extension header, don't try to
1355 * pull it from the chain.
1358 case IPPROTO_DSTOPTS:
1359 case IPPROTO_ROUTING:
1360 case IPPROTO_HOPOPTS:
1361 case IPPROTO_AH: /* is it possible? */
1367 #ifndef PULLDOWN_TEST
1368 if (off + sizeof(*ip6e) > m->m_len)
1370 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1371 if (nxt == IPPROTO_AH)
1372 elen = (ip6e->ip6e_len + 2) << 2;
1374 elen = (ip6e->ip6e_len + 1) << 3;
1375 if (off + elen > m->m_len)
1378 ext = ip6_pullexthdr(m, off, nxt);
1380 V_ip6stat.ip6s_tooshort++;
1383 ip6e = mtod(ext, struct ip6_ext *);
1384 if (nxt == IPPROTO_AH)
1385 elen = (ip6e->ip6e_len + 2) << 2;
1387 elen = (ip6e->ip6e_len + 1) << 3;
1388 if (elen != ext->m_len) {
1390 V_ip6stat.ip6s_tooshort++;
1396 case IPPROTO_DSTOPTS:
1397 if (!(in6p->inp_flags & IN6P_DSTOPTS))
1400 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1402 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1405 mp = &(*mp)->m_next;
1407 case IPPROTO_ROUTING:
1408 if (!in6p->inp_flags & IN6P_RTHDR)
1411 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1412 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
1415 mp = &(*mp)->m_next;
1417 case IPPROTO_HOPOPTS:
1418 case IPPROTO_AH: /* is it possible? */
1423 * other cases have been filtered in the above.
1424 * none will visit this case. here we supply
1425 * the code just in case (nxt overwritten or
1428 #ifdef PULLDOWN_TEST
1435 /* proceed with the next header. */
1437 nxt = ip6e->ip6e_nxt;
1439 #ifdef PULLDOWN_TEST
1451 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1455 struct ip6_mtuinfo mtuctl;
1457 so = in6p->inp_socket;
1463 if (so == NULL) /* I believe this is impossible */
1464 panic("ip6_notify_pmtu: socket is NULL");
1467 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1468 mtuctl.ip6m_mtu = *mtu;
1469 mtuctl.ip6m_addr = *dst;
1470 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1473 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1474 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1477 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1480 /* XXX: should count statistics */
1487 #ifdef PULLDOWN_TEST
1489 * pull single extension header from mbuf chain. returns single mbuf that
1490 * contains the result, or NULL on error.
1492 static struct mbuf *
1493 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1495 struct ip6_ext ip6e;
1501 case IPPROTO_DSTOPTS:
1502 case IPPROTO_ROUTING:
1503 case IPPROTO_HOPOPTS:
1504 case IPPROTO_AH: /* is it possible? */
1507 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1511 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1512 if (nxt == IPPROTO_AH)
1513 elen = (ip6e.ip6e_len + 2) << 2;
1515 elen = (ip6e.ip6e_len + 1) << 3;
1517 MGET(n, M_DONTWAIT, MT_DATA);
1518 if (n && elen >= MLEN) {
1519 MCLGET(n, M_DONTWAIT);
1520 if ((n->m_flags & M_EXT) == 0) {
1529 if (elen >= M_TRAILINGSPACE(n)) {
1534 m_copydata(m, off, elen, mtod(n, caddr_t));
1541 * Get pointer to the previous header followed by the header
1542 * currently processed.
1543 * XXX: This function supposes that
1544 * M includes all headers,
1545 * the next header field and the header length field of each header
1547 * the sum of each header length equals to OFF.
1548 * Because of these assumptions, this function must be called very
1549 * carefully. Moreover, it will not be used in the near future when
1550 * we develop `neater' mechanism to process extension headers.
1553 ip6_get_prevhdr(struct mbuf *m, int off)
1555 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1557 if (off == sizeof(struct ip6_hdr))
1558 return (&ip6->ip6_nxt);
1561 struct ip6_ext *ip6e = NULL;
1564 len = sizeof(struct ip6_hdr);
1566 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1569 case IPPROTO_FRAGMENT:
1570 len += sizeof(struct ip6_frag);
1573 len += (ip6e->ip6e_len + 2) << 2;
1576 len += (ip6e->ip6e_len + 1) << 3;
1579 nxt = ip6e->ip6e_nxt;
1582 return (&ip6e->ip6e_nxt);
1589 * get next header offset. m will be retained.
1592 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1595 struct ip6_ext ip6e;
1600 panic("ip6_nexthdr: m == NULL");
1601 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1606 if (m->m_pkthdr.len < off + sizeof(ip6))
1608 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1610 *nxtp = ip6.ip6_nxt;
1614 case IPPROTO_FRAGMENT:
1616 * terminate parsing if it is not the first fragment,
1617 * it does not make sense to parse through it.
1619 if (m->m_pkthdr.len < off + sizeof(fh))
1621 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1622 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1623 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1626 *nxtp = fh.ip6f_nxt;
1627 off += sizeof(struct ip6_frag);
1631 if (m->m_pkthdr.len < off + sizeof(ip6e))
1633 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1635 *nxtp = ip6e.ip6e_nxt;
1636 off += (ip6e.ip6e_len + 2) << 2;
1639 case IPPROTO_HOPOPTS:
1640 case IPPROTO_ROUTING:
1641 case IPPROTO_DSTOPTS:
1642 if (m->m_pkthdr.len < off + sizeof(ip6e))
1644 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1646 *nxtp = ip6e.ip6e_nxt;
1647 off += (ip6e.ip6e_len + 1) << 3;
1652 case IPPROTO_IPCOMP:
1664 * get offset for the last header in the chain. m will be kept untainted.
1667 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1677 newoff = ip6_nexthdr(m, off, proto, nxtp);
1680 else if (newoff < off)
1681 return -1; /* invalid */
1682 else if (newoff == off)
1691 ip6_addaux(struct mbuf *m)
1695 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1697 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
1700 m_tag_prepend(m, mtag);
1701 bzero(mtag + 1, sizeof(struct ip6aux));
1704 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1708 ip6_findaux(struct mbuf *m)
1712 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1713 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1717 ip6_delaux(struct mbuf *m)
1721 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1723 m_tag_delete(m, mtag);
1727 * System control for IP6
1730 u_char inet6ctlerrmap[PRC_NCMDS] = {
1732 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1733 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1734 EMSGSIZE, EHOSTUNREACH, 0, 0,