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];
119 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
121 static struct netisr_handler ip6_nh = {
123 .nh_handler = ip6_input,
124 .nh_proto = NETISR_IPV6,
125 .nh_policy = NETISR_POLICY_FLOW,
128 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch);
129 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
131 VNET_DEFINE(struct pfil_head, inet6_pfil_hook);
133 VNET_DEFINE(struct ip6stat, ip6stat);
135 struct rwlock in6_ifaddr_lock;
136 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
138 static void ip6_init2(void *);
139 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *);
140 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
142 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
146 * IP6 initialization: fill in IP6 protocol switch table.
147 * All protocols not implemented in kernel go to raw IP6 protocol handler.
152 struct ip6protosw *pr;
155 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
156 &V_ip6_auto_linklocal);
158 TAILQ_INIT(&V_in6_ifaddrhead);
160 /* Initialize packet filter hooks. */
161 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
162 V_inet6_pfil_hook.ph_af = AF_INET6;
163 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0)
164 printf("%s: WARNING: unable to register pfil hook, "
165 "error %d\n", __func__, i);
168 addrsel_policy_init();
172 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
174 /* Skip global initialization stuff for non-default instances. */
175 if (!IS_DEFAULT_VNET(curvnet))
179 if (sizeof(struct protosw) != sizeof(struct ip6protosw))
180 panic("sizeof(protosw) != sizeof(ip6protosw)");
182 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
186 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
187 for (i = 0; i < IPPROTO_MAX; i++)
188 ip6_protox[i] = pr - inet6sw;
190 * Cycle through IP protocols and put them into the appropriate place
193 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
194 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
195 if (pr->pr_domain->dom_family == PF_INET6 &&
196 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
197 /* Be careful to only index valid IP protocols. */
198 if (pr->pr_protocol < IPPROTO_MAX)
199 ip6_protox[pr->pr_protocol] = pr - inet6sw;
202 netisr_register(&ip6_nh);
211 callout_drain(&V_in6_tmpaddrtimer_ch);
216 ip6_init2_vnet(const void *unused __unused)
220 callout_init(&V_nd6_timer_ch, 0);
221 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet);
223 /* timer for regeneranation of temporary addresses randomize ID */
224 callout_init(&V_in6_tmpaddrtimer_ch, 0);
225 callout_reset(&V_in6_tmpaddrtimer_ch,
226 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
227 V_ip6_temp_regen_advance) * hz,
228 in6_tmpaddrtimer, curvnet);
234 ip6_init2(void *dummy)
237 ip6_init2_vnet(NULL);
241 /* This must be after route_init(), which is now SI_ORDER_THIRD */
242 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
245 ip6_input(struct mbuf *m)
248 int off = sizeof(struct ip6_hdr), nest;
250 u_int32_t rtalert = ~0;
252 struct ifnet *deliverifp = NULL, *ifp = NULL;
253 struct in6_addr odst;
254 struct route_in6 rin6;
256 struct llentry *lle = NULL;
257 struct sockaddr_in6 dst6, *dst;
259 bzero(&rin6, sizeof(struct route_in6));
262 * should the inner packet be considered authentic?
263 * see comment in ah4_input().
264 * NB: m cannot be NULL when passed to the input routine
267 m->m_flags &= ~M_AUTHIPHDR;
268 m->m_flags &= ~M_AUTHIPDGM;
273 * make sure we don't have onion peering information into m_tag.
280 if (m->m_flags & M_EXT) {
282 V_ip6stat.ip6s_mext2m++;
284 V_ip6stat.ip6s_mext1++;
286 #define M2MMAX (sizeof(V_ip6stat.ip6s_m2m)/sizeof(V_ip6stat.ip6s_m2m[0]))
288 if (m->m_flags & M_LOOP) {
289 V_ip6stat.ip6s_m2m[V_loif->if_index]++;
290 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
291 V_ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
293 V_ip6stat.ip6s_m2m[0]++;
299 /* drop the packet if IPv6 operation is disabled on the IF */
300 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
305 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
306 V_ip6stat.ip6s_total++;
308 #ifndef PULLDOWN_TEST
310 * L2 bridge code and some other code can return mbuf chain
311 * that does not conform to KAME requirement. too bad.
312 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
314 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
317 MGETHDR(n, M_DONTWAIT, MT_HEADER);
320 if (n && n->m_pkthdr.len > MHLEN) {
321 MCLGET(n, M_DONTWAIT);
322 if ((n->m_flags & M_EXT) == 0) {
329 return; /* ENOBUFS */
332 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
333 n->m_len = n->m_pkthdr.len;
337 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */);
340 if (m->m_len < sizeof(struct ip6_hdr)) {
342 inifp = m->m_pkthdr.rcvif;
343 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
344 V_ip6stat.ip6s_toosmall++;
345 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
350 ip6 = mtod(m, struct ip6_hdr *);
352 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
353 V_ip6stat.ip6s_badvers++;
354 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
358 V_ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
361 * Check against address spoofing/corruption.
363 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
364 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
366 * XXX: "badscope" is not very suitable for a multicast source.
368 V_ip6stat.ip6s_badscope++;
369 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
372 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
373 !(m->m_flags & M_LOOP)) {
375 * In this case, the packet should come from the loopback
376 * interface. However, we cannot just check the if_flags,
377 * because ip6_mloopback() passes the "actual" interface
378 * as the outgoing/incoming interface.
380 V_ip6stat.ip6s_badscope++;
381 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
386 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
387 /* packet is dropped by traffic conditioner */
392 * The following check is not documented in specs. A malicious
393 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
394 * and bypass security checks (act as if it was from 127.0.0.1 by using
395 * IPv6 src ::ffff:127.0.0.1). Be cautious.
397 * This check chokes if we are in an SIIT cloud. As none of BSDs
398 * support IPv4-less kernel compilation, we cannot support SIIT
399 * environment at all. So, it makes more sense for us to reject any
400 * malicious packets for non-SIIT environment, than try to do a
401 * partial support for SIIT environment.
403 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
404 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
405 V_ip6stat.ip6s_badscope++;
406 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
411 * Reject packets with IPv4 compatible addresses (auto tunnel).
413 * The code forbids auto tunnel relay case in RFC1933 (the check is
414 * stronger than RFC1933). We may want to re-enable it if mech-xx
415 * is revised to forbid relaying case.
417 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
418 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
419 V_ip6stat.ip6s_badscope++;
420 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
426 * Run through list of hooks for input packets.
428 * NB: Beware of the destination address changing
429 * (e.g. by NAT rewriting). When this happens,
430 * tell ip6_forward to do the right thing.
434 /* Jump over all PFIL processing if hooks are not active. */
435 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
438 if (pfil_run_hooks(&V_inet6_pfil_hook, &m,
439 m->m_pkthdr.rcvif, PFIL_IN, NULL))
441 if (m == NULL) /* consumed by filter */
443 ip6 = mtod(m, struct ip6_hdr *);
444 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
448 * Disambiguate address scope zones (if there is ambiguity).
449 * We first make sure that the original source or destination address
450 * is not in our internal form for scoped addresses. Such addresses
451 * are not necessarily invalid spec-wise, but we cannot accept them due
452 * to the usage conflict.
453 * in6_setscope() then also checks and rejects the cases where src or
454 * dst are the loopback address and the receiving interface
457 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
458 V_ip6stat.ip6s_badscope++; /* XXX */
461 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
462 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
463 V_ip6stat.ip6s_badscope++;
468 * Multicast check. Assume packet is for us to avoid
469 * prematurely taking locks.
471 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
473 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
474 deliverifp = m->m_pkthdr.rcvif;
482 bzero(&dst6, sizeof(dst6));
483 dst6.sin6_family = AF_INET6;
484 dst6.sin6_len = sizeof(struct sockaddr_in6);
485 dst6.sin6_addr = ip6->ip6_dst;
486 ifp = m->m_pkthdr.rcvif;
488 lle = lla_lookup(LLTABLE6(ifp), 0,
489 (struct sockaddr *)&dst6);
490 IF_AFDATA_UNLOCK(ifp);
491 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) {
501 dst->sin6_len = sizeof(struct sockaddr_in6);
502 dst->sin6_family = AF_INET6;
503 dst->sin6_addr = ip6->ip6_dst;
504 rin6.ro_rt = rtalloc1((struct sockaddr *)dst, 0, 0);
506 RT_UNLOCK(rin6.ro_rt);
508 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
511 * Accept the packet if the forwarding interface to the destination
512 * according to the routing table is the loopback interface,
513 * unless the associated route has a gateway.
514 * Note that this approach causes to accept a packet if there is a
515 * route to the loopback interface for the destination of the packet.
516 * But we think it's even useful in some situations, e.g. when using
517 * a special daemon which wants to intercept the packet.
519 * XXX: some OSes automatically make a cloned route for the destination
520 * of an outgoing packet. If the outgoing interface of the packet
521 * is a loopback one, the kernel would consider the packet to be
522 * accepted, even if we have no such address assinged on the interface.
523 * We check the cloned flag of the route entry to reject such cases,
524 * assuming that route entries for our own addresses are not made by
525 * cloning (it should be true because in6_addloop explicitly installs
526 * the host route). However, we might have to do an explicit check
527 * while it would be less efficient. Or, should we rather install a
528 * reject route for such a case?
531 (rin6.ro_rt->rt_flags &
532 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
534 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) &&
537 !(rin6.ro_rt->rt_flags & RTF_CLONED) &&
541 * The check below is redundant since the comparison of
542 * the destination and the key of the rtentry has
543 * already done through looking up the routing table.
545 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
546 &rt6_key(rin6.ro_rt)->sin6_addr)
548 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) {
550 struct in6_ifaddr *ia6;
553 * found the loopback route to the interface address
555 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) {
556 struct sockaddr_in6 dest6;
558 bzero(&dest6, sizeof(dest6));
559 dest6.sin6_family = AF_INET6;
560 dest6.sin6_len = sizeof(dest6);
561 dest6.sin6_addr = ip6->ip6_dst;
562 ia6 = (struct in6_ifaddr *)
563 ifa_ifwithaddr((struct sockaddr *)&dest6);
569 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa;
572 * record address information into m_tag.
574 (void)ip6_setdstifaddr(m, ia6);
577 * packets to a tentative, duplicated, or somehow invalid
578 * address must not be accepted.
580 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
581 /* this address is ready */
583 deliverifp = ia6->ia_ifp; /* correct? */
584 /* Count the packet in the ip address stats */
585 ia6->ia_ifa.if_ipackets++;
586 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
587 if (ia6 != NULL && free_ia6 != 0)
588 ifa_free(&ia6->ia_ifa);
591 char ip6bufs[INET6_ADDRSTRLEN];
592 char ip6bufd[INET6_ADDRSTRLEN];
593 /* address is not ready, so discard the packet. */
595 "ip6_input: packet to an unready address %s->%s\n",
596 ip6_sprintf(ip6bufs, &ip6->ip6_src),
597 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
599 if (ia6 != NULL && free_ia6 != 0)
600 ifa_free(&ia6->ia_ifa);
606 * FAITH (Firewall Aided Internet Translator)
608 if (V_ip6_keepfaith) {
609 if (rin6.ro_rt && rin6.ro_rt->rt_ifp &&
610 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) {
611 /* XXX do we need more sanity checks? */
613 deliverifp = rin6.ro_rt->rt_ifp; /* faith */
619 * Now there is no reason to process the packet if it's not our own
620 * and we're not a router.
622 if (!V_ip6_forwarding) {
623 V_ip6stat.ip6s_cantforward++;
624 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
630 * record address information into m_tag, if we don't have one yet.
631 * note that we are unable to record it, if the address is not listed
632 * as our interface address (e.g. multicast addresses, addresses
633 * within FAITH prefixes and such).
635 if (deliverifp && !ip6_getdstifaddr(m)) {
636 struct in6_ifaddr *ia6;
638 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
640 if (!ip6_setdstifaddr(m, ia6)) {
642 * XXX maybe we should drop the packet here,
643 * as we could not provide enough information
644 * to the upper layers.
647 ifa_free(&ia6->ia_ifa);
652 * Process Hop-by-Hop options header if it's contained.
653 * m may be modified in ip6_hopopts_input().
654 * If a JumboPayload option is included, plen will also be modified.
656 plen = (u_int32_t)ntohs(ip6->ip6_plen);
657 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
660 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
661 #if 0 /*touches NULL pointer*/
662 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
664 goto out; /* m have already been freed */
668 ip6 = mtod(m, struct ip6_hdr *);
671 * if the payload length field is 0 and the next header field
672 * indicates Hop-by-Hop Options header, then a Jumbo Payload
673 * option MUST be included.
675 if (ip6->ip6_plen == 0 && plen == 0) {
677 * Note that if a valid jumbo payload option is
678 * contained, ip6_hopopts_input() must set a valid
679 * (non-zero) payload length to the variable plen.
681 V_ip6stat.ip6s_badoptions++;
682 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
683 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
684 icmp6_error(m, ICMP6_PARAM_PROB,
685 ICMP6_PARAMPROB_HEADER,
686 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
689 #ifndef PULLDOWN_TEST
690 /* ip6_hopopts_input() ensures that mbuf is contiguous */
691 hbh = (struct ip6_hbh *)(ip6 + 1);
693 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
694 sizeof(struct ip6_hbh));
696 V_ip6stat.ip6s_tooshort++;
703 * If we are acting as a router and the packet contains a
704 * router alert option, see if we know the option value.
705 * Currently, we only support the option value for MLD, in which
706 * case we should pass the packet to the multicast routing
711 case IP6OPT_RTALERT_MLD:
712 if (V_ip6_forwarding)
717 * RFC2711 requires unrecognized values must be
727 * Check that the amount of data in the buffers
728 * is as at least much as the IPv6 header would have us expect.
729 * Trim mbufs if longer than we expect.
730 * Drop packet if shorter than we expect.
732 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
733 V_ip6stat.ip6s_tooshort++;
734 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
737 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
738 if (m->m_len == m->m_pkthdr.len) {
739 m->m_len = sizeof(struct ip6_hdr) + plen;
740 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
742 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
746 * Forward if desirable.
749 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
751 * If we are acting as a multicast router, all
752 * incoming multicast packets are passed to the
753 * kernel-level multicast forwarding function.
754 * The packet is returned (relatively) intact; if
755 * ip6_mforward() returns a non-zero value, the packet
756 * must be discarded, else it may be accepted below.
758 * XXX TODO: Check hlim and multicast scope here to avoid
759 * unnecessarily calling into ip6_mforward().
762 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
763 IP6STAT_INC(ip6s_cantforward);
764 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
768 ip6_forward(m, srcrt);
772 ip6 = mtod(m, struct ip6_hdr *);
775 * Malicious party may be able to use IPv4 mapped addr to confuse
776 * tcp/udp stack and bypass security checks (act as if it was from
777 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
779 * For SIIT end node behavior, you may want to disable the check.
780 * However, you will become vulnerable to attacks using IPv4 mapped
783 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
784 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
785 V_ip6stat.ip6s_badscope++;
786 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
791 * Tell launch routine the next header
793 V_ip6stat.ip6s_delivered++;
794 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
797 while (nxt != IPPROTO_DONE) {
798 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
799 V_ip6stat.ip6s_toomanyhdr++;
804 * protection against faulty packet - there should be
805 * more sanity checks in header chain processing.
807 if (m->m_pkthdr.len < off) {
808 V_ip6stat.ip6s_tooshort++;
809 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
815 * enforce IPsec policy checking if we are seeing last header.
816 * note that we do not visit this with protocols with pcb layer
817 * code - like udp/tcp/raw ip.
819 if (ip6_ipsec_input(m, nxt))
824 * Use mbuf flags to propagate Router Alert option to
825 * ICMPv6 layer, as hop-by-hop options have been stripped.
827 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0)
828 m->m_flags |= M_RTALERT_MLD;
830 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
841 * set/grab in6_ifaddr correspond to IPv6 destination address.
842 * XXX backward compatibility wrapper
844 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag,
845 * and then bump it when the tag is copied, and release it when the tag is
846 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead
847 * we just bump the ia refcount when we receive it. This should be fixed.
849 static struct ip6aux *
850 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
854 ip6a = ip6_addaux(m);
856 ip6a->ip6a_dstia6 = ia6;
857 return ip6a; /* NULL if failed to set */
861 ip6_getdstifaddr(struct mbuf *m)
864 struct in6_ifaddr *ia;
866 ip6a = ip6_findaux(m);
868 ia = ip6a->ip6a_dstia6;
869 ifa_ref(&ia->ia_ifa);
876 * Hop-by-Hop options header processing. If a valid jumbo payload option is
877 * included, the real payload length will be stored in plenp.
879 * rtalertp - XXX: should be stored more smart way
882 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
883 struct mbuf **mp, int *offp)
885 struct mbuf *m = *mp;
886 int off = *offp, hbhlen;
890 /* validation of the length of the header */
891 #ifndef PULLDOWN_TEST
892 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
893 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
894 hbhlen = (hbh->ip6h_len + 1) << 3;
896 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
897 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
899 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
900 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
902 V_ip6stat.ip6s_tooshort++;
905 hbhlen = (hbh->ip6h_len + 1) << 3;
906 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
909 V_ip6stat.ip6s_tooshort++;
914 hbhlen -= sizeof(struct ip6_hbh);
915 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
917 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
918 hbhlen, rtalertp, plenp) < 0)
927 * Search header for all Hop-by-hop options and process each option.
928 * This function is separate from ip6_hopopts_input() in order to
929 * handle a case where the sending node itself process its hop-by-hop
930 * options header. In such a case, the function is called from ip6_output().
932 * The function assumes that hbh header is located right after the IPv6 header
933 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
934 * opthead + hbhlen is located in continuous memory region.
937 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
938 u_int32_t *rtalertp, u_int32_t *plenp)
942 u_int8_t *opt = opthead;
943 u_int16_t rtalert_val;
945 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
947 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
953 if (hbhlen < IP6OPT_MINLEN) {
954 V_ip6stat.ip6s_toosmall++;
957 optlen = *(opt + 1) + 2;
959 case IP6OPT_ROUTER_ALERT:
960 /* XXX may need check for alignment */
961 if (hbhlen < IP6OPT_RTALERT_LEN) {
962 V_ip6stat.ip6s_toosmall++;
965 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
967 icmp6_error(m, ICMP6_PARAM_PROB,
968 ICMP6_PARAMPROB_HEADER,
969 erroff + opt + 1 - opthead);
972 optlen = IP6OPT_RTALERT_LEN;
973 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
974 *rtalertp = ntohs(rtalert_val);
977 /* XXX may need check for alignment */
978 if (hbhlen < IP6OPT_JUMBO_LEN) {
979 V_ip6stat.ip6s_toosmall++;
982 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
984 icmp6_error(m, ICMP6_PARAM_PROB,
985 ICMP6_PARAMPROB_HEADER,
986 erroff + opt + 1 - opthead);
989 optlen = IP6OPT_JUMBO_LEN;
992 * IPv6 packets that have non 0 payload length
993 * must not contain a jumbo payload option.
995 ip6 = mtod(m, struct ip6_hdr *);
997 V_ip6stat.ip6s_badoptions++;
998 icmp6_error(m, ICMP6_PARAM_PROB,
999 ICMP6_PARAMPROB_HEADER,
1000 erroff + opt - opthead);
1005 * We may see jumbolen in unaligned location, so
1006 * we'd need to perform bcopy().
1008 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1009 jumboplen = (u_int32_t)htonl(jumboplen);
1013 * if there are multiple jumbo payload options,
1014 * *plenp will be non-zero and the packet will be
1016 * the behavior may need some debate in ipngwg -
1017 * multiple options does not make sense, however,
1018 * there's no explicit mention in specification.
1021 V_ip6stat.ip6s_badoptions++;
1022 icmp6_error(m, ICMP6_PARAM_PROB,
1023 ICMP6_PARAMPROB_HEADER,
1024 erroff + opt + 2 - opthead);
1030 * jumbo payload length must be larger than 65535.
1032 if (jumboplen <= IPV6_MAXPACKET) {
1033 V_ip6stat.ip6s_badoptions++;
1034 icmp6_error(m, ICMP6_PARAM_PROB,
1035 ICMP6_PARAMPROB_HEADER,
1036 erroff + opt + 2 - opthead);
1042 default: /* unknown option */
1043 if (hbhlen < IP6OPT_MINLEN) {
1044 V_ip6stat.ip6s_toosmall++;
1047 optlen = ip6_unknown_opt(opt, m,
1048 erroff + opt - opthead);
1064 * Unknown option processing.
1065 * The third argument `off' is the offset from the IPv6 header to the option,
1066 * which is necessary if the IPv6 header the and option header and IPv6 header
1067 * is not continuous in order to return an ICMPv6 error.
1070 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1072 struct ip6_hdr *ip6;
1074 switch (IP6OPT_TYPE(*optp)) {
1075 case IP6OPT_TYPE_SKIP: /* ignore the option */
1076 return ((int)*(optp + 1));
1077 case IP6OPT_TYPE_DISCARD: /* silently discard */
1080 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1081 V_ip6stat.ip6s_badoptions++;
1082 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1084 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1085 V_ip6stat.ip6s_badoptions++;
1086 ip6 = mtod(m, struct ip6_hdr *);
1087 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1088 (m->m_flags & (M_BCAST|M_MCAST)))
1091 icmp6_error(m, ICMP6_PARAM_PROB,
1092 ICMP6_PARAMPROB_OPTION, off);
1096 m_freem(m); /* XXX: NOTREACHED */
1101 * Create the "control" list for this pcb.
1102 * These functions will not modify mbuf chain at all.
1104 * With KAME mbuf chain restriction:
1105 * The routine will be called from upper layer handlers like tcp6_input().
1106 * Thus the routine assumes that the caller (tcp6_input) have already
1107 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1108 * very first mbuf on the mbuf chain.
1110 * ip6_savecontrol_v4 will handle those options that are possible to be
1111 * set on a v4-mapped socket.
1112 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1113 * options and handle the v6-only ones itself.
1116 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1119 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1122 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1126 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1127 SCM_TIMESTAMP, SOL_SOCKET);
1129 mp = &(*mp)->m_next;
1133 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1139 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1140 /* RFC 2292 sec. 5 */
1141 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1142 struct in6_pktinfo pi6;
1144 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1145 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1147 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1149 *mp = sbcreatecontrol((caddr_t) &pi6,
1150 sizeof(struct in6_pktinfo),
1151 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1153 mp = &(*mp)->m_next;
1156 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1157 int hlim = ip6->ip6_hlim & 0xff;
1159 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1160 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1163 mp = &(*mp)->m_next;
1172 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
1174 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1177 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only);
1181 if ((in6p->inp_flags & IN6P_TCLASS) != 0) {
1185 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1188 tclass = flowinfo & 0xff;
1189 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(tclass),
1190 IPV6_TCLASS, IPPROTO_IPV6);
1192 mp = &(*mp)->m_next;
1196 * IPV6_HOPOPTS socket option. Recall that we required super-user
1197 * privilege for the option (see ip6_ctloutput), but it might be too
1198 * strict, since there might be some hop-by-hop options which can be
1199 * returned to normal user.
1200 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1202 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
1204 * Check if a hop-by-hop options header is contatined in the
1205 * received packet, and if so, store the options as ancillary
1206 * data. Note that a hop-by-hop options header must be
1207 * just after the IPv6 header, which is assured through the
1208 * IPv6 input processing.
1210 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1211 struct ip6_hbh *hbh;
1213 #ifdef PULLDOWN_TEST
1217 #ifndef PULLDOWN_TEST
1218 hbh = (struct ip6_hbh *)(ip6 + 1);
1219 hbhlen = (hbh->ip6h_len + 1) << 3;
1221 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1224 V_ip6stat.ip6s_tooshort++;
1227 hbh = mtod(ext, struct ip6_hbh *);
1228 hbhlen = (hbh->ip6h_len + 1) << 3;
1229 if (hbhlen != ext->m_len) {
1231 V_ip6stat.ip6s_tooshort++;
1237 * XXX: We copy the whole header even if a
1238 * jumbo payload option is included, the option which
1239 * is to be removed before returning according to
1241 * Note: this constraint is removed in RFC3542
1243 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1244 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1247 mp = &(*mp)->m_next;
1248 #ifdef PULLDOWN_TEST
1254 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1255 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1258 * Search for destination options headers or routing
1259 * header(s) through the header chain, and stores each
1260 * header as ancillary data.
1261 * Note that the order of the headers remains in
1262 * the chain of ancillary data.
1264 while (1) { /* is explicit loop prevention necessary? */
1265 struct ip6_ext *ip6e = NULL;
1267 #ifdef PULLDOWN_TEST
1268 struct mbuf *ext = NULL;
1272 * if it is not an extension header, don't try to
1273 * pull it from the chain.
1276 case IPPROTO_DSTOPTS:
1277 case IPPROTO_ROUTING:
1278 case IPPROTO_HOPOPTS:
1279 case IPPROTO_AH: /* is it possible? */
1285 #ifndef PULLDOWN_TEST
1286 if (off + sizeof(*ip6e) > m->m_len)
1288 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1289 if (nxt == IPPROTO_AH)
1290 elen = (ip6e->ip6e_len + 2) << 2;
1292 elen = (ip6e->ip6e_len + 1) << 3;
1293 if (off + elen > m->m_len)
1296 ext = ip6_pullexthdr(m, off, nxt);
1298 V_ip6stat.ip6s_tooshort++;
1301 ip6e = mtod(ext, struct ip6_ext *);
1302 if (nxt == IPPROTO_AH)
1303 elen = (ip6e->ip6e_len + 2) << 2;
1305 elen = (ip6e->ip6e_len + 1) << 3;
1306 if (elen != ext->m_len) {
1308 V_ip6stat.ip6s_tooshort++;
1314 case IPPROTO_DSTOPTS:
1315 if (!(in6p->inp_flags & IN6P_DSTOPTS))
1318 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1320 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1323 mp = &(*mp)->m_next;
1325 case IPPROTO_ROUTING:
1326 if (!in6p->inp_flags & IN6P_RTHDR)
1329 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1330 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
1333 mp = &(*mp)->m_next;
1335 case IPPROTO_HOPOPTS:
1336 case IPPROTO_AH: /* is it possible? */
1341 * other cases have been filtered in the above.
1342 * none will visit this case. here we supply
1343 * the code just in case (nxt overwritten or
1346 #ifdef PULLDOWN_TEST
1353 /* proceed with the next header. */
1355 nxt = ip6e->ip6e_nxt;
1357 #ifdef PULLDOWN_TEST
1369 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1373 struct ip6_mtuinfo mtuctl;
1375 so = in6p->inp_socket;
1381 if (so == NULL) /* I believe this is impossible */
1382 panic("ip6_notify_pmtu: socket is NULL");
1385 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1386 mtuctl.ip6m_mtu = *mtu;
1387 mtuctl.ip6m_addr = *dst;
1388 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1391 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1392 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1395 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1398 /* XXX: should count statistics */
1405 #ifdef PULLDOWN_TEST
1407 * pull single extension header from mbuf chain. returns single mbuf that
1408 * contains the result, or NULL on error.
1410 static struct mbuf *
1411 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1413 struct ip6_ext ip6e;
1419 case IPPROTO_DSTOPTS:
1420 case IPPROTO_ROUTING:
1421 case IPPROTO_HOPOPTS:
1422 case IPPROTO_AH: /* is it possible? */
1425 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1429 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1430 if (nxt == IPPROTO_AH)
1431 elen = (ip6e.ip6e_len + 2) << 2;
1433 elen = (ip6e.ip6e_len + 1) << 3;
1435 MGET(n, M_DONTWAIT, MT_DATA);
1436 if (n && elen >= MLEN) {
1437 MCLGET(n, M_DONTWAIT);
1438 if ((n->m_flags & M_EXT) == 0) {
1447 if (elen >= M_TRAILINGSPACE(n)) {
1452 m_copydata(m, off, elen, mtod(n, caddr_t));
1459 * Get pointer to the previous header followed by the header
1460 * currently processed.
1461 * XXX: This function supposes that
1462 * M includes all headers,
1463 * the next header field and the header length field of each header
1465 * the sum of each header length equals to OFF.
1466 * Because of these assumptions, this function must be called very
1467 * carefully. Moreover, it will not be used in the near future when
1468 * we develop `neater' mechanism to process extension headers.
1471 ip6_get_prevhdr(struct mbuf *m, int off)
1473 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1475 if (off == sizeof(struct ip6_hdr))
1476 return (&ip6->ip6_nxt);
1479 struct ip6_ext *ip6e = NULL;
1482 len = sizeof(struct ip6_hdr);
1484 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1487 case IPPROTO_FRAGMENT:
1488 len += sizeof(struct ip6_frag);
1491 len += (ip6e->ip6e_len + 2) << 2;
1494 len += (ip6e->ip6e_len + 1) << 3;
1497 nxt = ip6e->ip6e_nxt;
1500 return (&ip6e->ip6e_nxt);
1507 * get next header offset. m will be retained.
1510 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1513 struct ip6_ext ip6e;
1518 panic("ip6_nexthdr: m == NULL");
1519 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1524 if (m->m_pkthdr.len < off + sizeof(ip6))
1526 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1528 *nxtp = ip6.ip6_nxt;
1532 case IPPROTO_FRAGMENT:
1534 * terminate parsing if it is not the first fragment,
1535 * it does not make sense to parse through it.
1537 if (m->m_pkthdr.len < off + sizeof(fh))
1539 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1540 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1541 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1544 *nxtp = fh.ip6f_nxt;
1545 off += sizeof(struct ip6_frag);
1549 if (m->m_pkthdr.len < off + sizeof(ip6e))
1551 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1553 *nxtp = ip6e.ip6e_nxt;
1554 off += (ip6e.ip6e_len + 2) << 2;
1557 case IPPROTO_HOPOPTS:
1558 case IPPROTO_ROUTING:
1559 case IPPROTO_DSTOPTS:
1560 if (m->m_pkthdr.len < off + sizeof(ip6e))
1562 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1564 *nxtp = ip6e.ip6e_nxt;
1565 off += (ip6e.ip6e_len + 1) << 3;
1570 case IPPROTO_IPCOMP:
1582 * get offset for the last header in the chain. m will be kept untainted.
1585 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1595 newoff = ip6_nexthdr(m, off, proto, nxtp);
1598 else if (newoff < off)
1599 return -1; /* invalid */
1600 else if (newoff == off)
1609 ip6_addaux(struct mbuf *m)
1613 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1615 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
1618 m_tag_prepend(m, mtag);
1619 bzero(mtag + 1, sizeof(struct ip6aux));
1622 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1626 ip6_findaux(struct mbuf *m)
1630 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1631 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1635 ip6_delaux(struct mbuf *m)
1639 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1641 m_tag_delete(m, mtag);
1645 * System control for IP6
1648 u_char inet6ctlerrmap[PRC_NCMDS] = {
1650 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1651 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1652 EMSGSIZE, EHOSTUNREACH, 0, 0,