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) {
631 struct in6_ifaddr *ia6 =
632 (struct in6_ifaddr *)rin6.ro_rt->rt_ifa;
635 * record address information into m_tag.
637 (void)ip6_setdstifaddr(m, ia6);
640 * packets to a tentative, duplicated, or somehow invalid
641 * address must not be accepted.
643 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
644 /* this address is ready */
646 deliverifp = ia6->ia_ifp; /* correct? */
647 /* Count the packet in the ip address stats */
648 ia6->ia_ifa.if_ipackets++;
649 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
652 char ip6bufs[INET6_ADDRSTRLEN];
653 char ip6bufd[INET6_ADDRSTRLEN];
654 /* address is not ready, so discard the packet. */
656 "ip6_input: packet to an unready address %s->%s\n",
657 ip6_sprintf(ip6bufs, &ip6->ip6_src),
658 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
665 * FAITH (Firewall Aided Internet Translator)
667 if (V_ip6_keepfaith) {
668 if (rin6.ro_rt && rin6.ro_rt->rt_ifp &&
669 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) {
670 /* XXX do we need more sanity checks? */
672 deliverifp = rin6.ro_rt->rt_ifp; /* faith */
678 * Now there is no reason to process the packet if it's not our own
679 * and we're not a router.
681 if (!V_ip6_forwarding) {
682 V_ip6stat.ip6s_cantforward++;
683 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
689 * record address information into m_tag, if we don't have one yet.
690 * note that we are unable to record it, if the address is not listed
691 * as our interface address (e.g. multicast addresses, addresses
692 * within FAITH prefixes and such).
694 if (deliverifp && !ip6_getdstifaddr(m)) {
695 struct in6_ifaddr *ia6;
697 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
699 if (!ip6_setdstifaddr(m, ia6)) {
701 * XXX maybe we should drop the packet here,
702 * as we could not provide enough information
703 * to the upper layers.
706 ifa_free(&ia6->ia_ifa);
711 * Process Hop-by-Hop options header if it's contained.
712 * m may be modified in ip6_hopopts_input().
713 * If a JumboPayload option is included, plen will also be modified.
715 plen = (u_int32_t)ntohs(ip6->ip6_plen);
716 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
719 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
720 #if 0 /*touches NULL pointer*/
721 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
723 goto out; /* m have already been freed */
727 ip6 = mtod(m, struct ip6_hdr *);
730 * if the payload length field is 0 and the next header field
731 * indicates Hop-by-Hop Options header, then a Jumbo Payload
732 * option MUST be included.
734 if (ip6->ip6_plen == 0 && plen == 0) {
736 * Note that if a valid jumbo payload option is
737 * contained, ip6_hopopts_input() must set a valid
738 * (non-zero) payload length to the variable plen.
740 V_ip6stat.ip6s_badoptions++;
741 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
742 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
743 icmp6_error(m, ICMP6_PARAM_PROB,
744 ICMP6_PARAMPROB_HEADER,
745 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
748 #ifndef PULLDOWN_TEST
749 /* ip6_hopopts_input() ensures that mbuf is contiguous */
750 hbh = (struct ip6_hbh *)(ip6 + 1);
752 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
753 sizeof(struct ip6_hbh));
755 V_ip6stat.ip6s_tooshort++;
762 * If we are acting as a router and the packet contains a
763 * router alert option, see if we know the option value.
764 * Currently, we only support the option value for MLD, in which
765 * case we should pass the packet to the multicast routing
770 case IP6OPT_RTALERT_MLD:
771 if (V_ip6_forwarding)
776 * RFC2711 requires unrecognized values must be
786 * Check that the amount of data in the buffers
787 * is as at least much as the IPv6 header would have us expect.
788 * Trim mbufs if longer than we expect.
789 * Drop packet if shorter than we expect.
791 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
792 V_ip6stat.ip6s_tooshort++;
793 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
796 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
797 if (m->m_len == m->m_pkthdr.len) {
798 m->m_len = sizeof(struct ip6_hdr) + plen;
799 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
801 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
805 * Forward if desirable.
808 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
810 * If we are acting as a multicast router, all
811 * incoming multicast packets are passed to the
812 * kernel-level multicast forwarding function.
813 * The packet is returned (relatively) intact; if
814 * ip6_mforward() returns a non-zero value, the packet
815 * must be discarded, else it may be accepted below.
817 * XXX TODO: Check hlim and multicast scope here to avoid
818 * unnecessarily calling into ip6_mforward().
821 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
822 IP6STAT_INC(ip6s_cantforward);
823 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
827 ip6_forward(m, srcrt);
831 ip6 = mtod(m, struct ip6_hdr *);
834 * Malicious party may be able to use IPv4 mapped addr to confuse
835 * tcp/udp stack and bypass security checks (act as if it was from
836 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
838 * For SIIT end node behavior, you may want to disable the check.
839 * However, you will become vulnerable to attacks using IPv4 mapped
842 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
843 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
844 V_ip6stat.ip6s_badscope++;
845 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
850 * Tell launch routine the next header
852 V_ip6stat.ip6s_delivered++;
853 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
856 while (nxt != IPPROTO_DONE) {
857 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
858 V_ip6stat.ip6s_toomanyhdr++;
863 * protection against faulty packet - there should be
864 * more sanity checks in header chain processing.
866 if (m->m_pkthdr.len < off) {
867 V_ip6stat.ip6s_tooshort++;
868 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
874 * enforce IPsec policy checking if we are seeing last header.
875 * note that we do not visit this with protocols with pcb layer
876 * code - like udp/tcp/raw ip.
878 if (ip6_ipsec_input(m, nxt))
883 * Use mbuf flags to propagate Router Alert option to
884 * ICMPv6 layer, as hop-by-hop options have been stripped.
886 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0)
887 m->m_flags |= M_RTALERT_MLD;
889 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
900 * set/grab in6_ifaddr correspond to IPv6 destination address.
901 * XXX backward compatibility wrapper
903 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag,
904 * and then bump it when the tag is copied, and release it when the tag is
905 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead
906 * we just bump the ia refcount when we receive it. This should be fixed.
908 static struct ip6aux *
909 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
913 ip6a = ip6_addaux(m);
915 ip6a->ip6a_dstia6 = ia6;
916 return ip6a; /* NULL if failed to set */
920 ip6_getdstifaddr(struct mbuf *m)
923 struct in6_ifaddr *ia;
925 ip6a = ip6_findaux(m);
927 ia = ip6a->ip6a_dstia6;
928 ifa_ref(&ia->ia_ifa);
935 * Hop-by-Hop options header processing. If a valid jumbo payload option is
936 * included, the real payload length will be stored in plenp.
938 * rtalertp - XXX: should be stored more smart way
941 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
942 struct mbuf **mp, int *offp)
944 struct mbuf *m = *mp;
945 int off = *offp, hbhlen;
949 /* validation of the length of the header */
950 #ifndef PULLDOWN_TEST
951 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
952 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
953 hbhlen = (hbh->ip6h_len + 1) << 3;
955 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
956 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
958 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
959 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
961 V_ip6stat.ip6s_tooshort++;
964 hbhlen = (hbh->ip6h_len + 1) << 3;
965 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
968 V_ip6stat.ip6s_tooshort++;
973 hbhlen -= sizeof(struct ip6_hbh);
974 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
976 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
977 hbhlen, rtalertp, plenp) < 0)
986 * Search header for all Hop-by-hop options and process each option.
987 * This function is separate from ip6_hopopts_input() in order to
988 * handle a case where the sending node itself process its hop-by-hop
989 * options header. In such a case, the function is called from ip6_output().
991 * The function assumes that hbh header is located right after the IPv6 header
992 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
993 * opthead + hbhlen is located in continuous memory region.
996 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
997 u_int32_t *rtalertp, u_int32_t *plenp)
1001 u_int8_t *opt = opthead;
1002 u_int16_t rtalert_val;
1003 u_int32_t jumboplen;
1004 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1006 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1012 if (hbhlen < IP6OPT_MINLEN) {
1013 V_ip6stat.ip6s_toosmall++;
1016 optlen = *(opt + 1) + 2;
1018 case IP6OPT_ROUTER_ALERT:
1019 /* XXX may need check for alignment */
1020 if (hbhlen < IP6OPT_RTALERT_LEN) {
1021 V_ip6stat.ip6s_toosmall++;
1024 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1026 icmp6_error(m, ICMP6_PARAM_PROB,
1027 ICMP6_PARAMPROB_HEADER,
1028 erroff + opt + 1 - opthead);
1031 optlen = IP6OPT_RTALERT_LEN;
1032 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1033 *rtalertp = ntohs(rtalert_val);
1036 /* XXX may need check for alignment */
1037 if (hbhlen < IP6OPT_JUMBO_LEN) {
1038 V_ip6stat.ip6s_toosmall++;
1041 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1043 icmp6_error(m, ICMP6_PARAM_PROB,
1044 ICMP6_PARAMPROB_HEADER,
1045 erroff + opt + 1 - opthead);
1048 optlen = IP6OPT_JUMBO_LEN;
1051 * IPv6 packets that have non 0 payload length
1052 * must not contain a jumbo payload option.
1054 ip6 = mtod(m, struct ip6_hdr *);
1055 if (ip6->ip6_plen) {
1056 V_ip6stat.ip6s_badoptions++;
1057 icmp6_error(m, ICMP6_PARAM_PROB,
1058 ICMP6_PARAMPROB_HEADER,
1059 erroff + opt - opthead);
1064 * We may see jumbolen in unaligned location, so
1065 * we'd need to perform bcopy().
1067 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1068 jumboplen = (u_int32_t)htonl(jumboplen);
1072 * if there are multiple jumbo payload options,
1073 * *plenp will be non-zero and the packet will be
1075 * the behavior may need some debate in ipngwg -
1076 * multiple options does not make sense, however,
1077 * there's no explicit mention in specification.
1080 V_ip6stat.ip6s_badoptions++;
1081 icmp6_error(m, ICMP6_PARAM_PROB,
1082 ICMP6_PARAMPROB_HEADER,
1083 erroff + opt + 2 - opthead);
1089 * jumbo payload length must be larger than 65535.
1091 if (jumboplen <= IPV6_MAXPACKET) {
1092 V_ip6stat.ip6s_badoptions++;
1093 icmp6_error(m, ICMP6_PARAM_PROB,
1094 ICMP6_PARAMPROB_HEADER,
1095 erroff + opt + 2 - opthead);
1101 default: /* unknown option */
1102 if (hbhlen < IP6OPT_MINLEN) {
1103 V_ip6stat.ip6s_toosmall++;
1106 optlen = ip6_unknown_opt(opt, m,
1107 erroff + opt - opthead);
1123 * Unknown option processing.
1124 * The third argument `off' is the offset from the IPv6 header to the option,
1125 * which is necessary if the IPv6 header the and option header and IPv6 header
1126 * is not continuous in order to return an ICMPv6 error.
1129 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1131 struct ip6_hdr *ip6;
1133 switch (IP6OPT_TYPE(*optp)) {
1134 case IP6OPT_TYPE_SKIP: /* ignore the option */
1135 return ((int)*(optp + 1));
1136 case IP6OPT_TYPE_DISCARD: /* silently discard */
1139 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1140 V_ip6stat.ip6s_badoptions++;
1141 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1143 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1144 V_ip6stat.ip6s_badoptions++;
1145 ip6 = mtod(m, struct ip6_hdr *);
1146 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1147 (m->m_flags & (M_BCAST|M_MCAST)))
1150 icmp6_error(m, ICMP6_PARAM_PROB,
1151 ICMP6_PARAMPROB_OPTION, off);
1155 m_freem(m); /* XXX: NOTREACHED */
1160 * Create the "control" list for this pcb.
1161 * These functions will not modify mbuf chain at all.
1163 * With KAME mbuf chain restriction:
1164 * The routine will be called from upper layer handlers like tcp6_input().
1165 * Thus the routine assumes that the caller (tcp6_input) have already
1166 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1167 * very first mbuf on the mbuf chain.
1169 * ip6_savecontrol_v4 will handle those options that are possible to be
1170 * set on a v4-mapped socket.
1171 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1172 * options and handle the v6-only ones itself.
1175 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1178 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1181 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1185 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1186 SCM_TIMESTAMP, SOL_SOCKET);
1188 mp = &(*mp)->m_next;
1192 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1198 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1199 /* RFC 2292 sec. 5 */
1200 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1201 struct in6_pktinfo pi6;
1203 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1204 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1206 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1208 *mp = sbcreatecontrol((caddr_t) &pi6,
1209 sizeof(struct in6_pktinfo),
1210 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1212 mp = &(*mp)->m_next;
1215 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1216 int hlim = ip6->ip6_hlim & 0xff;
1218 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1219 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1222 mp = &(*mp)->m_next;
1231 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
1233 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1236 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only);
1240 if ((in6p->inp_flags & IN6P_TCLASS) != 0) {
1244 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1247 tclass = flowinfo & 0xff;
1248 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1249 IPV6_TCLASS, IPPROTO_IPV6);
1251 mp = &(*mp)->m_next;
1255 * IPV6_HOPOPTS socket option. Recall that we required super-user
1256 * privilege for the option (see ip6_ctloutput), but it might be too
1257 * strict, since there might be some hop-by-hop options which can be
1258 * returned to normal user.
1259 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1261 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
1263 * Check if a hop-by-hop options header is contatined in the
1264 * received packet, and if so, store the options as ancillary
1265 * data. Note that a hop-by-hop options header must be
1266 * just after the IPv6 header, which is assured through the
1267 * IPv6 input processing.
1269 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1270 struct ip6_hbh *hbh;
1272 #ifdef PULLDOWN_TEST
1276 #ifndef PULLDOWN_TEST
1277 hbh = (struct ip6_hbh *)(ip6 + 1);
1278 hbhlen = (hbh->ip6h_len + 1) << 3;
1280 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1283 V_ip6stat.ip6s_tooshort++;
1286 hbh = mtod(ext, struct ip6_hbh *);
1287 hbhlen = (hbh->ip6h_len + 1) << 3;
1288 if (hbhlen != ext->m_len) {
1290 V_ip6stat.ip6s_tooshort++;
1296 * XXX: We copy the whole header even if a
1297 * jumbo payload option is included, the option which
1298 * is to be removed before returning according to
1300 * Note: this constraint is removed in RFC3542
1302 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1303 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1306 mp = &(*mp)->m_next;
1307 #ifdef PULLDOWN_TEST
1313 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1314 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1317 * Search for destination options headers or routing
1318 * header(s) through the header chain, and stores each
1319 * header as ancillary data.
1320 * Note that the order of the headers remains in
1321 * the chain of ancillary data.
1323 while (1) { /* is explicit loop prevention necessary? */
1324 struct ip6_ext *ip6e = NULL;
1326 #ifdef PULLDOWN_TEST
1327 struct mbuf *ext = NULL;
1331 * if it is not an extension header, don't try to
1332 * pull it from the chain.
1335 case IPPROTO_DSTOPTS:
1336 case IPPROTO_ROUTING:
1337 case IPPROTO_HOPOPTS:
1338 case IPPROTO_AH: /* is it possible? */
1344 #ifndef PULLDOWN_TEST
1345 if (off + sizeof(*ip6e) > m->m_len)
1347 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1348 if (nxt == IPPROTO_AH)
1349 elen = (ip6e->ip6e_len + 2) << 2;
1351 elen = (ip6e->ip6e_len + 1) << 3;
1352 if (off + elen > m->m_len)
1355 ext = ip6_pullexthdr(m, off, nxt);
1357 V_ip6stat.ip6s_tooshort++;
1360 ip6e = mtod(ext, struct ip6_ext *);
1361 if (nxt == IPPROTO_AH)
1362 elen = (ip6e->ip6e_len + 2) << 2;
1364 elen = (ip6e->ip6e_len + 1) << 3;
1365 if (elen != ext->m_len) {
1367 V_ip6stat.ip6s_tooshort++;
1373 case IPPROTO_DSTOPTS:
1374 if (!(in6p->inp_flags & IN6P_DSTOPTS))
1377 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1379 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1382 mp = &(*mp)->m_next;
1384 case IPPROTO_ROUTING:
1385 if (!in6p->inp_flags & IN6P_RTHDR)
1388 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1389 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
1392 mp = &(*mp)->m_next;
1394 case IPPROTO_HOPOPTS:
1395 case IPPROTO_AH: /* is it possible? */
1400 * other cases have been filtered in the above.
1401 * none will visit this case. here we supply
1402 * the code just in case (nxt overwritten or
1405 #ifdef PULLDOWN_TEST
1412 /* proceed with the next header. */
1414 nxt = ip6e->ip6e_nxt;
1416 #ifdef PULLDOWN_TEST
1428 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1432 struct ip6_mtuinfo mtuctl;
1434 so = in6p->inp_socket;
1440 if (so == NULL) /* I believe this is impossible */
1441 panic("ip6_notify_pmtu: socket is NULL");
1444 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1445 mtuctl.ip6m_mtu = *mtu;
1446 mtuctl.ip6m_addr = *dst;
1447 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1450 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1451 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1454 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1457 /* XXX: should count statistics */
1464 #ifdef PULLDOWN_TEST
1466 * pull single extension header from mbuf chain. returns single mbuf that
1467 * contains the result, or NULL on error.
1469 static struct mbuf *
1470 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1472 struct ip6_ext ip6e;
1478 case IPPROTO_DSTOPTS:
1479 case IPPROTO_ROUTING:
1480 case IPPROTO_HOPOPTS:
1481 case IPPROTO_AH: /* is it possible? */
1484 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1488 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1489 if (nxt == IPPROTO_AH)
1490 elen = (ip6e.ip6e_len + 2) << 2;
1492 elen = (ip6e.ip6e_len + 1) << 3;
1494 MGET(n, M_DONTWAIT, MT_DATA);
1495 if (n && elen >= MLEN) {
1496 MCLGET(n, M_DONTWAIT);
1497 if ((n->m_flags & M_EXT) == 0) {
1506 if (elen >= M_TRAILINGSPACE(n)) {
1511 m_copydata(m, off, elen, mtod(n, caddr_t));
1518 * Get pointer to the previous header followed by the header
1519 * currently processed.
1520 * XXX: This function supposes that
1521 * M includes all headers,
1522 * the next header field and the header length field of each header
1524 * the sum of each header length equals to OFF.
1525 * Because of these assumptions, this function must be called very
1526 * carefully. Moreover, it will not be used in the near future when
1527 * we develop `neater' mechanism to process extension headers.
1530 ip6_get_prevhdr(struct mbuf *m, int off)
1532 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1534 if (off == sizeof(struct ip6_hdr))
1535 return (&ip6->ip6_nxt);
1538 struct ip6_ext *ip6e = NULL;
1541 len = sizeof(struct ip6_hdr);
1543 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1546 case IPPROTO_FRAGMENT:
1547 len += sizeof(struct ip6_frag);
1550 len += (ip6e->ip6e_len + 2) << 2;
1553 len += (ip6e->ip6e_len + 1) << 3;
1556 nxt = ip6e->ip6e_nxt;
1559 return (&ip6e->ip6e_nxt);
1566 * get next header offset. m will be retained.
1569 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1572 struct ip6_ext ip6e;
1577 panic("ip6_nexthdr: m == NULL");
1578 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1583 if (m->m_pkthdr.len < off + sizeof(ip6))
1585 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1587 *nxtp = ip6.ip6_nxt;
1591 case IPPROTO_FRAGMENT:
1593 * terminate parsing if it is not the first fragment,
1594 * it does not make sense to parse through it.
1596 if (m->m_pkthdr.len < off + sizeof(fh))
1598 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1599 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1600 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1603 *nxtp = fh.ip6f_nxt;
1604 off += sizeof(struct ip6_frag);
1608 if (m->m_pkthdr.len < off + sizeof(ip6e))
1610 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1612 *nxtp = ip6e.ip6e_nxt;
1613 off += (ip6e.ip6e_len + 2) << 2;
1616 case IPPROTO_HOPOPTS:
1617 case IPPROTO_ROUTING:
1618 case IPPROTO_DSTOPTS:
1619 if (m->m_pkthdr.len < off + sizeof(ip6e))
1621 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1623 *nxtp = ip6e.ip6e_nxt;
1624 off += (ip6e.ip6e_len + 1) << 3;
1629 case IPPROTO_IPCOMP:
1641 * get offset for the last header in the chain. m will be kept untainted.
1644 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1654 newoff = ip6_nexthdr(m, off, proto, nxtp);
1657 else if (newoff < off)
1658 return -1; /* invalid */
1659 else if (newoff == off)
1668 ip6_addaux(struct mbuf *m)
1672 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1674 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
1677 m_tag_prepend(m, mtag);
1678 bzero(mtag + 1, sizeof(struct ip6aux));
1681 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1685 ip6_findaux(struct mbuf *m)
1689 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1690 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1694 ip6_delaux(struct mbuf *m)
1698 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1700 m_tag_delete(m, mtag);
1704 * System control for IP6
1707 u_char inet6ctlerrmap[PRC_NCMDS] = {
1709 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1710 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1711 EMSGSIZE, EHOSTUNREACH, 0, 0,