1 /* $FreeBSD: src/sys/netinet6/ip6_input.c,v 1.11.2.15 2003/01/24 05:11:35 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/ip6_input.c,v 1.34 2007/05/23 08:57:09 dillon Exp $ */
3 /* $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
69 #include "opt_ip6fw.h"
71 #include "opt_inet6.h"
72 #include "opt_ipsec.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/malloc.h>
78 #include <sys/domain.h>
79 #include <sys/protosw.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
82 #include <sys/errno.h>
84 #include <sys/kernel.h>
85 #include <sys/syslog.h>
88 #include <sys/thread2.h>
89 #include <sys/msgport2.h>
92 #include <net/if_types.h>
93 #include <net/if_dl.h>
94 #include <net/route.h>
95 #include <net/netisr.h>
98 #include <netinet/in.h>
99 #include <netinet/in_systm.h>
101 #include <netinet/ip.h>
102 #include <netinet/ip_icmp.h>
104 #include <netinet/ip6.h>
105 #include <netinet6/in6_var.h>
106 #include <netinet6/ip6_var.h>
107 #include <netinet/in_pcb.h>
108 #include <netinet/icmp6.h>
109 #include <netinet6/scope6_var.h>
110 #include <netinet6/in6_ifattach.h>
111 #include <netinet6/nd6.h>
112 #include <netinet6/in6_prefix.h>
115 #include <netinet6/ipsec.h>
117 #include <netinet6/ipsec6.h>
122 #include <netproto/ipsec/ipsec.h>
123 #include <netproto/ipsec/ipsec6.h>
125 #endif /* FAST_IPSEC */
127 #include <net/ip6fw/ip6_fw.h>
129 #include <netinet6/ip6protosw.h>
131 /* we need it for NLOOP. */
132 #include "use_loop.h"
134 #include <net/net_osdep.h>
136 extern struct domain inet6domain;
137 extern struct ip6protosw inet6sw[];
139 u_char ip6_protox[IPPROTO_MAX];
140 struct in6_ifaddr *in6_ifaddr;
142 extern struct callout in6_tmpaddrtimer_ch;
144 int ip6_forward_srcrt; /* XXX */
145 int ip6_sourcecheck; /* XXX */
146 int ip6_sourcecheck_interval; /* XXX */
148 int ip6_ours_check_algorithm;
150 struct pfil_head inet6_pfil_hook;
153 ip6_fw_chk_t *ip6_fw_chk_ptr;
154 ip6_fw_ctl_t *ip6_fw_ctl_ptr;
155 int ip6_fw_enable = 1;
157 struct ip6stat ip6stat;
159 static void ip6_init2 (void *);
160 static struct ip6aux *ip6_setdstifaddr (struct mbuf *, struct in6_ifaddr *);
161 static int ip6_hopopts_input (u_int32_t *, u_int32_t *, struct mbuf **, int *);
162 static void ip6_input(struct netmsg *msg);
164 static struct mbuf *ip6_pullexthdr (struct mbuf *, size_t, int);
168 * IP6 initialization: fill in IP6 protocol switch table.
169 * All protocols not implemented in kernel go to raw IP6 protocol handler.
174 struct ip6protosw *pr;
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);
185 for (i = 0; i < IPPROTO_MAX; i++)
186 ip6_protox[i] = pr - inet6sw;
187 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
188 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
189 if (pr->pr_domain->dom_family == PF_INET6 &&
190 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
191 ip6_protox[pr->pr_protocol] = pr - inet6sw;
193 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
194 inet6_pfil_hook.ph_af = AF_INET6;
195 if ((i = pfil_head_register(&inet6_pfil_hook)) != 0) {
196 kprintf("%s: WARNING: unable to register pfil hook, "
197 "error %d\n", __func__, i);
200 netisr_register(NETISR_IPV6, cpu0_portfn, ip6_input);
205 * in many cases, random() here does NOT return random number
206 * as initialization during bootstrap time occur in fixed order.
209 ip6_flow_seq = krandom() ^ tv.tv_usec;
211 ip6_desync_factor = (krandom() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
215 ip6_init2(void *dummy)
218 callout_init(&nd6_timer_ch);
219 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
221 /* router renumbering prefix list maintenance */
222 callout_init(&in6_rr_timer_ch);
223 callout_reset(&in6_rr_timer_ch, hz, in6_rr_timer, NULL);
225 /* timer for regeneranation of temporary addresses randomize ID */
226 callout_init(&in6_tmpaddrtimer_ch);
227 callout_reset(&in6_tmpaddrtimer_ch,
228 (ip6_temp_preferred_lifetime - ip6_desync_factor -
229 ip6_temp_regen_advance) * hz,
230 in6_tmpaddrtimer, NULL);
234 /* This must be after route_init(), which is now SI_ORDER_THIRD */
235 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
237 extern struct route_in6 ip6_forward_rt;
241 ip6_input(struct netmsg *msg)
243 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
245 int off = sizeof(struct ip6_hdr), nest;
247 u_int32_t rtalert = ~0;
248 int nxt, ours = 0, rh_present = 0;
249 struct ifnet *deliverifp = NULL;
250 struct in6_addr odst;
255 * should the inner packet be considered authentic?
256 * see comment in ah4_input().
259 m->m_flags &= ~M_AUTHIPHDR;
260 m->m_flags &= ~M_AUTHIPDGM;
265 * make sure we don't have onion peering information into m_aux.
272 if (m->m_flags & M_EXT) {
274 ip6stat.ip6s_mext2m++;
276 ip6stat.ip6s_mext1++;
278 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
280 if (m->m_flags & M_LOOP) {
281 ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
282 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
283 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
285 ip6stat.ip6s_m2m[0]++;
291 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
292 ip6stat.ip6s_total++;
294 #ifndef PULLDOWN_TEST
296 * L2 bridge code and some other code can return mbuf chain
297 * that does not conform to KAME requirement. too bad.
298 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
300 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
303 n = m_getb(m->m_pkthdr.len, MB_DONTWAIT, MT_HEADER, M_PKTHDR);
308 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
309 n->m_len = n->m_pkthdr.len;
313 IP6_EXTHDR_CHECK_VOIDRET(m, 0, sizeof(struct ip6_hdr));
316 if (m->m_len < sizeof(struct ip6_hdr)) {
318 inifp = m->m_pkthdr.rcvif;
319 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
320 ip6stat.ip6s_toosmall++;
321 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
326 ip6 = mtod(m, struct ip6_hdr *);
328 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
329 ip6stat.ip6s_badvers++;
330 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
335 * Run through list of hooks for input packets.
337 * NB: Beware of the destination address changing
338 * (e.g. by NAT rewriting). When this happens,
339 * tell ip6_forward to do the right thing.
341 if (pfil_has_hooks(&inet6_pfil_hook)) {
343 if (pfil_run_hooks(&inet6_pfil_hook, &m,
344 m->m_pkthdr.rcvif, PFIL_IN)) {
347 if (m == NULL) /* consumed by filter */
349 ip6 = mtod(m, struct ip6_hdr *);
350 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
353 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
356 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
357 /* packet is dropped by traffic conditioner */
363 * Check with the firewall...
365 if (ip6_fw_enable && ip6_fw_chk_ptr) {
367 /* If ipfw says divert, we have to just drop packet */
368 /* use port as a dummy argument */
369 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) {
378 * Check against address spoofing/corruption.
380 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
381 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
383 * XXX: "badscope" is not very suitable for a multicast source.
385 ip6stat.ip6s_badscope++;
386 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
389 if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
390 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
391 (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
392 ip6stat.ip6s_badscope++;
393 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
398 * The following check is not documented in specs. A malicious
399 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
400 * and bypass security checks (act as if it was from 127.0.0.1 by using
401 * IPv6 src ::ffff:127.0.0.1). Be cautious.
403 * This check chokes if we are in an SIIT cloud. As none of BSDs
404 * support IPv4-less kernel compilation, we cannot support SIIT
405 * environment at all. So, it makes more sense for us to reject any
406 * malicious packets for non-SIIT environment, than try to do a
407 * partical support for SIIT environment.
409 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
410 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
411 ip6stat.ip6s_badscope++;
412 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
417 * Reject packets with IPv4 compatible addresses (auto tunnel).
419 * The code forbids auto tunnel relay case in RFC1933 (the check is
420 * stronger than RFC1933). We may want to re-enable it if mech-xx
421 * is revised to forbid relaying case.
423 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
424 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
425 ip6stat.ip6s_badscope++;
426 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
431 /* drop packets if interface ID portion is already filled */
432 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
433 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
434 ip6->ip6_src.s6_addr16[1]) {
435 ip6stat.ip6s_badscope++;
438 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
439 ip6->ip6_dst.s6_addr16[1]) {
440 ip6stat.ip6s_badscope++;
445 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
446 ip6->ip6_src.s6_addr16[1]
447 = htons(m->m_pkthdr.rcvif->if_index);
448 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
449 ip6->ip6_dst.s6_addr16[1]
450 = htons(m->m_pkthdr.rcvif->if_index);
452 #if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
454 * We use rt->rt_ifp to determine if the address is ours or not.
455 * If rt_ifp is lo0, the address is ours.
456 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
457 * so any address under fe80::%lo0/64 will be mistakenly considered
458 * local. The special case is supplied to handle the case properly
459 * by actually looking at interface addresses
460 * (using in6ifa_ifpwithaddr).
462 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
463 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
464 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
465 icmp6_error(m, ICMP6_DST_UNREACH,
466 ICMP6_DST_UNREACH_ADDR, 0);
467 /* m is already freed */
472 deliverifp = m->m_pkthdr.rcvif;
480 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
481 struct in6_multi *in6m = 0;
483 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
485 * See if we belong to the destination multicast group on the
488 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
491 else if (!ip6_mrouter) {
492 ip6stat.ip6s_notmember++;
493 ip6stat.ip6s_cantforward++;
494 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
497 deliverifp = m->m_pkthdr.rcvif;
504 switch (ip6_ours_check_algorithm) {
507 * XXX: I intentionally broke our indentation rule here,
508 * since this switch-case is just for measurement and
509 * therefore should soon be removed.
511 if (ip6_forward_rt.ro_rt != NULL &&
512 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) &&
513 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
514 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
515 ip6stat.ip6s_forward_cachehit++;
517 struct sockaddr_in6 *dst6;
519 if (ip6_forward_rt.ro_rt) {
520 /* route is down or destination is different */
521 ip6stat.ip6s_forward_cachemiss++;
522 RTFREE(ip6_forward_rt.ro_rt);
523 ip6_forward_rt.ro_rt = 0;
526 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
527 dst6 = &ip6_forward_rt.ro_dst;
528 dst6->sin6_len = sizeof(struct sockaddr_in6);
529 dst6->sin6_family = AF_INET6;
530 dst6->sin6_addr = ip6->ip6_dst;
532 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
535 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
538 * Accept the packet if the forwarding interface to the destination
539 * according to the routing table is the loopback interface,
540 * unless the associated route has a gateway.
541 * Note that this approach causes to accept a packet if there is a
542 * route to the loopback interface for the destination of the packet.
543 * But we think it's even useful in some situations, e.g. when using
544 * a special daemon which wants to intercept the packet.
546 * XXX: some OSes automatically make a cloned route for the destination
547 * of an outgoing packet. If the outgoing interface of the packet
548 * is a loopback one, the kernel would consider the packet to be
549 * accepted, even if we have no such address assinged on the interface.
550 * We check the cloned flag of the route entry to reject such cases,
551 * assuming that route entries for our own addresses are not made by
552 * cloning (it should be true because in6_addloop explicitly installs
553 * the host route). However, we might have to do an explicit check
554 * while it would be less efficient. Or, should we rather install a
555 * reject route for such a case?
557 if (ip6_forward_rt.ro_rt &&
558 (ip6_forward_rt.ro_rt->rt_flags &
559 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
561 !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
564 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
568 * The check below is redundant since the comparison of
569 * the destination and the key of the rtentry has
570 * already done through looking up the routing table.
572 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
573 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
575 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
576 struct in6_ifaddr *ia6 =
577 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
580 * record address information into m_aux.
582 ip6_setdstifaddr(m, ia6);
585 * packets to a tentative, duplicated, or somehow invalid
586 * address must not be accepted.
588 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
589 /* this address is ready */
591 deliverifp = ia6->ia_ifp; /* correct? */
592 /* Count the packet in the ip address stats */
593 ia6->ia_ifa.if_ipackets++;
594 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
597 /* address is not ready, so discard the packet. */
599 "ip6_input: packet to an unready address %s->%s\n",
600 ip6_sprintf(&ip6->ip6_src),
601 ip6_sprintf(&ip6->ip6_dst)));
606 } /* XXX indentation (see above) */
609 * FAITH(Firewall Aided Internet Translator)
612 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
613 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
614 /* XXX do we need more sanity checks? */
616 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
622 * Now there is no reason to process the packet if it's not our own
623 * and we're not a router.
625 if (!ip6_forwarding) {
626 ip6stat.ip6s_cantforward++;
627 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
633 * record address information into m_aux, if we don't have one yet.
634 * note that we are unable to record it, if the address is not listed
635 * as our interface address (e.g. multicast addresses, addresses
636 * within FAITH prefixes and such).
638 if (deliverifp && !ip6_getdstifaddr(m)) {
639 struct in6_ifaddr *ia6;
641 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
643 if (!ip6_setdstifaddr(m, ia6)) {
645 * XXX maybe we should drop the packet here,
646 * as we could not provide enough information
647 * to the upper layers.
654 * Process Hop-by-Hop options header if it's contained.
655 * m may be modified in ip6_hopopts_input().
656 * If a JumboPayload option is included, plen will also be modified.
658 plen = (u_int32_t)ntohs(ip6->ip6_plen);
659 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
662 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
663 #if 0 /*touches NULL pointer*/
664 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
666 goto bad2; /* m have already been freed */
670 ip6 = mtod(m, struct ip6_hdr *);
673 * if the payload length field is 0 and the next header field
674 * indicates Hop-by-Hop Options header, then a Jumbo Payload
675 * option MUST be included.
677 if (ip6->ip6_plen == 0 && plen == 0) {
679 * Note that if a valid jumbo payload option is
680 * contained, ip6_hoptops_input() must set a valid
681 * (non-zero) payload length to the variable plen.
683 ip6stat.ip6s_badoptions++;
684 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
685 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
686 icmp6_error(m, ICMP6_PARAM_PROB,
687 ICMP6_PARAMPROB_HEADER,
688 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
691 #ifndef PULLDOWN_TEST
692 /* ip6_hopopts_input() ensures that mbuf is contiguous */
693 hbh = (struct ip6_hbh *)(ip6 + 1);
695 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
696 sizeof(struct ip6_hbh));
698 ip6stat.ip6s_tooshort++;
705 * accept the packet if a router alert option is included
706 * and we act as an IPv6 router.
708 if (rtalert != ~0 && ip6_forwarding)
714 * Check that the amount of data in the buffers
715 * is as at least much as the IPv6 header would have us expect.
716 * Trim mbufs if longer than we expect.
717 * Drop packet if shorter than we expect.
719 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
720 ip6stat.ip6s_tooshort++;
721 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
724 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
725 if (m->m_len == m->m_pkthdr.len) {
726 m->m_len = sizeof(struct ip6_hdr) + plen;
727 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
729 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
733 * Forward if desirable.
735 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
737 * If we are acting as a multicast router, all
738 * incoming multicast packets are passed to the
739 * kernel-level multicast forwarding function.
740 * The packet is returned (relatively) intact; if
741 * ip6_mforward() returns a non-zero value, the packet
742 * must be discarded, else it may be accepted below.
744 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
745 ip6stat.ip6s_cantforward++;
751 ip6_forward(m, srcrt);
755 ip6 = mtod(m, struct ip6_hdr *);
758 * Malicious party may be able to use IPv4 mapped addr to confuse
759 * tcp/udp stack and bypass security checks (act as if it was from
760 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
762 * For SIIT end node behavior, you may want to disable the check.
763 * However, you will become vulnerable to attacks using IPv4 mapped
766 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
767 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
768 ip6stat.ip6s_badscope++;
769 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
774 * Tell launch routine the next header
776 ip6stat.ip6s_delivered++;
777 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
781 while (nxt != IPPROTO_DONE) {
782 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
783 ip6stat.ip6s_toomanyhdr++;
784 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
789 * protection against faulty packet - there should be
790 * more sanity checks in header chain processing.
792 if (m->m_pkthdr.len < off) {
793 ip6stat.ip6s_tooshort++;
794 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
800 * do we need to do it for every header? yeah, other
801 * functions can play with it (like re-allocate and copy).
803 mhist = ip6_addaux(m);
804 if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
805 hist = mtod(mhist, caddr_t) + mhist->m_len;
806 bcopy(&nxt, hist, sizeof(nxt));
807 mhist->m_len += sizeof(nxt);
809 ip6stat.ip6s_toomanyhdr++;
814 if (nxt == IPPROTO_ROUTING) {
816 in6_ifstat_inc(m->m_pkthdr.rcvif,
818 ip6stat.ip6s_badoptions++;
825 * enforce IPsec policy checking if we are seeing last header.
826 * note that we do not visit this with protocols with pcb layer
827 * code - like udp/tcp/raw ip.
829 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) &&
830 ipsec6_in_reject(m, NULL)) {
831 ipsec6stat.in_polvio++;
836 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
843 /* msg was embedded in the mbuf, do not reply! */
847 * set/grab in6_ifaddr correspond to IPv6 destination address.
848 * XXX backward compatibility wrapper
850 static struct ip6aux *
851 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
857 n->ip6a_dstia6 = ia6;
858 return n; /* NULL if failed to set */
862 ip6_getdstifaddr(struct mbuf *m)
868 return n->ip6a_dstia6;
874 * Hop-by-Hop options header processing. If a valid jumbo payload option is
875 * included, the real payload length will be stored in plenp.
878 ip6_hopopts_input(u_int32_t *plenp,
879 u_int32_t *rtalertp,/* XXX: should be stored more smart way */
883 struct mbuf *m = *mp;
884 int off = *offp, hbhlen;
888 /* validation of the length of the header */
889 #ifndef PULLDOWN_TEST
890 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
891 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
892 hbhlen = (hbh->ip6h_len + 1) << 3;
894 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
895 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
897 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
898 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
900 ip6stat.ip6s_tooshort++;
903 hbhlen = (hbh->ip6h_len + 1) << 3;
904 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
907 ip6stat.ip6s_tooshort++;
912 hbhlen -= sizeof(struct ip6_hbh);
913 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
915 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
916 hbhlen, rtalertp, plenp) < 0)
925 * Search header for all Hop-by-hop options and process each option.
926 * This function is separate from ip6_hopopts_input() in order to
927 * handle a case where the sending node itself process its hop-by-hop
928 * options header. In such a case, the function is called from ip6_output().
930 * The function assumes that hbh header is located right after the IPv6 header
931 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
932 * opthead + hbhlen is located in continuous memory region.
935 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
936 u_int32_t *rtalertp, u_int32_t *plenp)
940 u_int8_t *opt = opthead;
941 u_int16_t rtalert_val;
943 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
945 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
951 if (hbhlen < IP6OPT_MINLEN) {
952 ip6stat.ip6s_toosmall++;
955 optlen = *(opt + 1) + 2;
958 /* XXX may need check for alignment */
959 if (hbhlen < IP6OPT_RTALERT_LEN) {
960 ip6stat.ip6s_toosmall++;
963 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
965 icmp6_error(m, ICMP6_PARAM_PROB,
966 ICMP6_PARAMPROB_HEADER,
967 erroff + opt + 1 - opthead);
970 optlen = IP6OPT_RTALERT_LEN;
971 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
972 *rtalertp = ntohs(rtalert_val);
975 /* XXX may need check for alignment */
976 if (hbhlen < IP6OPT_JUMBO_LEN) {
977 ip6stat.ip6s_toosmall++;
980 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
982 icmp6_error(m, ICMP6_PARAM_PROB,
983 ICMP6_PARAMPROB_HEADER,
984 erroff + opt + 1 - opthead);
987 optlen = IP6OPT_JUMBO_LEN;
990 * IPv6 packets that have non 0 payload length
991 * must not contain a jumbo payload option.
993 ip6 = mtod(m, struct ip6_hdr *);
995 ip6stat.ip6s_badoptions++;
996 icmp6_error(m, ICMP6_PARAM_PROB,
997 ICMP6_PARAMPROB_HEADER,
998 erroff + opt - opthead);
1003 * We may see jumbolen in unaligned location, so
1004 * we'd need to perform bcopy().
1006 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1007 jumboplen = (u_int32_t)htonl(jumboplen);
1011 * if there are multiple jumbo payload options,
1012 * *plenp will be non-zero and the packet will be
1014 * the behavior may need some debate in ipngwg -
1015 * multiple options does not make sense, however,
1016 * there's no explicit mention in specification.
1019 ip6stat.ip6s_badoptions++;
1020 icmp6_error(m, ICMP6_PARAM_PROB,
1021 ICMP6_PARAMPROB_HEADER,
1022 erroff + opt + 2 - opthead);
1028 * jumbo payload length must be larger than 65535.
1030 if (jumboplen <= IPV6_MAXPACKET) {
1031 ip6stat.ip6s_badoptions++;
1032 icmp6_error(m, ICMP6_PARAM_PROB,
1033 ICMP6_PARAMPROB_HEADER,
1034 erroff + opt + 2 - opthead);
1040 default: /* unknown option */
1041 if (hbhlen < IP6OPT_MINLEN) {
1042 ip6stat.ip6s_toosmall++;
1045 optlen = ip6_unknown_opt(opt, m,
1046 erroff + opt - opthead);
1062 * Unknown option processing.
1063 * The third argument `off' is the offset from the IPv6 header to the option,
1064 * which is necessary if the IPv6 header the and option header and IPv6 header
1065 * is not continuous in order to return an ICMPv6 error.
1068 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1070 struct ip6_hdr *ip6;
1072 switch (IP6OPT_TYPE(*optp)) {
1073 case IP6OPT_TYPE_SKIP: /* ignore the option */
1074 return ((int)*(optp + 1));
1075 case IP6OPT_TYPE_DISCARD: /* silently discard */
1078 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1079 ip6stat.ip6s_badoptions++;
1080 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1082 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1083 ip6stat.ip6s_badoptions++;
1084 ip6 = mtod(m, struct ip6_hdr *);
1085 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1086 (m->m_flags & (M_BCAST|M_MCAST)))
1089 icmp6_error(m, ICMP6_PARAM_PROB,
1090 ICMP6_PARAMPROB_OPTION, off);
1094 m_freem(m); /* XXX: NOTREACHED */
1099 * Create the "control" list for this pcb.
1100 * The function will not modify mbuf chain at all.
1102 * with KAME mbuf chain restriction:
1103 * The routine will be called from upper layer handlers like tcp6_input().
1104 * Thus the routine assumes that the caller (tcp6_input) have already
1105 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1106 * very first mbuf on the mbuf chain.
1109 ip6_savecontrol(struct inpcb *in6p, struct mbuf **mp, struct ip6_hdr *ip6,
1112 struct thread *td = curthread; /* XXX */
1114 int rthdr_exist = 0;
1121 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1125 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1126 SCM_TIMESTAMP, SOL_SOCKET);
1128 mp = &(*mp)->m_next;
1133 /* RFC 2292 sec. 5 */
1134 if (in6p->in6p_flags & IN6P_PKTINFO) {
1135 struct in6_pktinfo pi6;
1136 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1137 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
1138 pi6.ipi6_addr.s6_addr16[1] = 0;
1139 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
1140 ? m->m_pkthdr.rcvif->if_index
1142 *mp = sbcreatecontrol((caddr_t) &pi6,
1143 sizeof(struct in6_pktinfo), IPV6_PKTINFO,
1146 mp = &(*mp)->m_next;
1149 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1150 int hlim = ip6->ip6_hlim & 0xff;
1151 *mp = sbcreatecontrol((caddr_t) &hlim,
1152 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
1154 mp = &(*mp)->m_next;
1158 * IPV6_HOPOPTS socket option. We require super-user privilege
1159 * for the option, but it might be too strict, since there might
1160 * be some hop-by-hop options which can be returned to normal user.
1161 * See RFC 2292 section 6.
1163 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
1165 * Check if a hop-by-hop options header is contatined in the
1166 * received packet, and if so, store the options as ancillary
1167 * data. Note that a hop-by-hop options header must be
1168 * just after the IPv6 header, which fact is assured through
1169 * the IPv6 input processing.
1171 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1172 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1173 struct ip6_hbh *hbh;
1175 #ifdef PULLDOWN_TEST
1179 #ifndef PULLDOWN_TEST
1180 hbh = (struct ip6_hbh *)(ip6 + 1);
1181 hbhlen = (hbh->ip6h_len + 1) << 3;
1183 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1186 ip6stat.ip6s_tooshort++;
1189 hbh = mtod(ext, struct ip6_hbh *);
1190 hbhlen = (hbh->ip6h_len + 1) << 3;
1191 if (hbhlen != ext->m_len) {
1193 ip6stat.ip6s_tooshort++;
1199 * XXX: We copy whole the header even if a jumbo
1200 * payload option is included, which option is to
1201 * be removed before returning in the RFC 2292.
1202 * Note: this constraint is removed in 2292bis.
1204 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1205 IPV6_HOPOPTS, IPPROTO_IPV6);
1207 mp = &(*mp)->m_next;
1208 #ifdef PULLDOWN_TEST
1214 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1215 if ((in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1216 int proto, off, nxt;
1219 * go through the header chain to see if a routing header is
1220 * contained in the packet. We need this information to store
1221 * destination options headers (if any) properly.
1222 * XXX: performance issue. We should record this info when
1223 * processing extension headers in incoming routine.
1226 proto = IPPROTO_IPV6;
1232 newoff = ip6_nexthdr(m, off, proto, &nxt);
1235 if (newoff < off) /* invalid, check for safety */
1237 if ((proto = nxt) == IPPROTO_ROUTING) {
1245 if ((in6p->in6p_flags &
1246 (IN6P_RTHDR | IN6P_DSTOPTS | IN6P_RTHDRDSTOPTS)) != 0) {
1247 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1248 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1251 * Search for destination options headers or routing
1252 * header(s) through the header chain, and stores each
1253 * header as ancillary data.
1254 * Note that the order of the headers remains in
1255 * the chain of ancillary data.
1257 while (1) { /* is explicit loop prevention necessary? */
1258 struct ip6_ext *ip6e = NULL;
1260 #ifdef PULLDOWN_TEST
1261 struct mbuf *ext = NULL;
1265 * if it is not an extension header, don't try to
1266 * pull it from the chain.
1269 case IPPROTO_DSTOPTS:
1270 case IPPROTO_ROUTING:
1271 case IPPROTO_HOPOPTS:
1272 case IPPROTO_AH: /* is it possible? */
1278 #ifndef PULLDOWN_TEST
1279 if (off + sizeof(*ip6e) > m->m_len)
1281 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1282 if (nxt == IPPROTO_AH)
1283 elen = (ip6e->ip6e_len + 2) << 2;
1285 elen = (ip6e->ip6e_len + 1) << 3;
1286 if (off + elen > m->m_len)
1289 ext = ip6_pullexthdr(m, off, nxt);
1291 ip6stat.ip6s_tooshort++;
1294 ip6e = mtod(ext, struct ip6_ext *);
1295 if (nxt == IPPROTO_AH)
1296 elen = (ip6e->ip6e_len + 2) << 2;
1298 elen = (ip6e->ip6e_len + 1) << 3;
1299 if (elen != ext->m_len) {
1301 ip6stat.ip6s_tooshort++;
1307 case IPPROTO_DSTOPTS:
1308 if ((in6p->in6p_flags & IN6P_DSTOPTS) == 0)
1312 * We also require super-user privilege for
1314 * See the comments on IN6_HOPOPTS.
1319 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1323 mp = &(*mp)->m_next;
1325 case IPPROTO_ROUTING:
1326 if (!in6p->in6p_flags & IN6P_RTHDR)
1329 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
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
1368 #ifdef PULLDOWN_TEST
1370 * pull single extension header from mbuf chain. returns single mbuf that
1371 * contains the result, or NULL on error.
1373 static struct mbuf *
1374 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1376 struct ip6_ext ip6e;
1382 case IPPROTO_DSTOPTS:
1383 case IPPROTO_ROUTING:
1384 case IPPROTO_HOPOPTS:
1385 case IPPROTO_AH: /* is it possible? */
1388 kprintf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1392 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1393 if (nxt == IPPROTO_AH)
1394 elen = (ip6e.ip6e_len + 2) << 2;
1396 elen = (ip6e.ip6e_len + 1) << 3;
1398 n = m_getb(elen, MB_DONTWAIT, MT_DATA, 0);
1403 if (elen >= M_TRAILINGSPACE(n)) {
1408 m_copydata(m, off, elen, mtod(n, caddr_t));
1415 * Get pointer to the previous header followed by the header
1416 * currently processed.
1417 * XXX: This function supposes that
1418 * M includes all headers,
1419 * the next header field and the header length field of each header
1421 * the sum of each header length equals to OFF.
1422 * Because of these assumptions, this function must be called very
1423 * carefully. Moreover, it will not be used in the near future when
1424 * we develop `neater' mechanism to process extension headers.
1427 ip6_get_prevhdr(struct mbuf *m, int off)
1429 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1431 if (off == sizeof(struct ip6_hdr))
1432 return (&ip6->ip6_nxt);
1435 struct ip6_ext *ip6e = NULL;
1438 len = sizeof(struct ip6_hdr);
1440 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1443 case IPPROTO_FRAGMENT:
1444 len += sizeof(struct ip6_frag);
1447 len += (ip6e->ip6e_len + 2) << 2;
1450 len += (ip6e->ip6e_len + 1) << 3;
1453 nxt = ip6e->ip6e_nxt;
1456 return (&ip6e->ip6e_nxt);
1463 * get next header offset. m will be retained.
1466 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1469 struct ip6_ext ip6e;
1474 panic("ip6_nexthdr: m == NULL");
1475 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1480 if (m->m_pkthdr.len < off + sizeof(ip6))
1482 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1484 *nxtp = ip6.ip6_nxt;
1488 case IPPROTO_FRAGMENT:
1490 * terminate parsing if it is not the first fragment,
1491 * it does not make sense to parse through it.
1493 if (m->m_pkthdr.len < off + sizeof(fh))
1495 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1496 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1497 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1500 *nxtp = fh.ip6f_nxt;
1501 off += sizeof(struct ip6_frag);
1505 if (m->m_pkthdr.len < off + sizeof(ip6e))
1507 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1509 *nxtp = ip6e.ip6e_nxt;
1510 off += (ip6e.ip6e_len + 2) << 2;
1513 case IPPROTO_HOPOPTS:
1514 case IPPROTO_ROUTING:
1515 case IPPROTO_DSTOPTS:
1516 if (m->m_pkthdr.len < off + sizeof(ip6e))
1518 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1520 *nxtp = ip6e.ip6e_nxt;
1521 off += (ip6e.ip6e_len + 1) << 3;
1526 case IPPROTO_IPCOMP:
1538 * get offset for the last header in the chain. m will be kept untainted.
1541 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1551 newoff = ip6_nexthdr(m, off, proto, nxtp);
1554 else if (newoff < off)
1555 return -1; /* invalid */
1556 else if (newoff == off)
1565 ip6_addaux(struct mbuf *m)
1567 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1569 tag = m_tag_get(PACKET_TAG_IPV6_INPUT,
1570 sizeof (struct ip6aux),
1573 m_tag_prepend(m, tag);
1576 bzero(m_tag_data(tag), sizeof (struct ip6aux));
1577 return tag ? (struct ip6aux *)m_tag_data(tag) : NULL;
1581 ip6_findaux(struct mbuf *m)
1583 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1584 return tag ? (struct ip6aux*)(tag+1) : NULL;
1588 ip6_delaux(struct mbuf *m)
1590 struct m_tag *tag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1592 m_tag_delete(m, tag);
1596 * System control for IP6
1599 u_char inet6ctlerrmap[PRC_NCMDS] = {
1601 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1602 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1603 EMSGSIZE, EHOSTUNREACH, 0, 0,