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"
69 #include "opt_ipsec.h"
70 #include "opt_kdtrace.h"
71 #include "opt_route.h"
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/malloc.h>
78 #include <sys/domain.h>
79 #include <sys/protosw.h>
81 #include <sys/socket.h>
82 #include <sys/socketvar.h>
83 #include <sys/errno.h>
85 #include <sys/kernel.h>
86 #include <sys/syslog.h>
89 #include <net/if_var.h>
90 #include <net/if_types.h>
91 #include <net/if_dl.h>
92 #include <net/route.h>
93 #include <net/netisr.h>
97 #include <netinet/in.h>
98 #include <netinet/in_kdtrace.h>
99 #include <netinet/ip_var.h>
100 #include <netinet/in_systm.h>
101 #include <net/if_llatbl.h>
103 #include <netinet/ip.h>
104 #include <netinet/ip_icmp.h>
106 #include <netinet/ip6.h>
107 #include <netinet6/in6_var.h>
108 #include <netinet6/ip6_var.h>
109 #include <netinet/in_pcb.h>
110 #include <netinet/icmp6.h>
111 #include <netinet6/scope6_var.h>
112 #include <netinet6/in6_ifattach.h>
113 #include <netinet6/nd6.h>
116 #include <netipsec/ipsec.h>
117 #include <netinet6/ip6_ipsec.h>
118 #include <netipsec/ipsec6.h>
121 #include <netinet6/ip6protosw.h>
124 #include <net/flowtable.h>
125 VNET_DECLARE(int, ip6_output_flowtable_size);
126 #define V_ip6_output_flowtable_size VNET(ip6_output_flowtable_size)
129 extern struct domain inet6domain;
131 u_char ip6_protox[IPPROTO_MAX];
132 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
133 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl);
134 VNET_DEFINE(u_long, in6_ifaddrhmask);
136 static struct netisr_handler ip6_nh = {
138 .nh_handler = ip6_input,
139 .nh_proto = NETISR_IPV6,
140 .nh_policy = NETISR_POLICY_FLOW,
143 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch);
144 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
146 VNET_DEFINE(struct pfil_head, inet6_pfil_hook);
148 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
149 VNET_PCPUSTAT_SYSINIT(ip6stat);
151 VNET_PCPUSTAT_SYSUNINIT(ip6stat);
154 struct rwlock in6_ifaddr_lock;
155 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
157 static void ip6_init2(void *);
158 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *);
159 static struct ip6aux *ip6_addaux(struct mbuf *);
160 static struct ip6aux *ip6_findaux(struct mbuf *m);
161 static void ip6_delaux (struct mbuf *);
162 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
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;
177 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
178 &V_ip6_auto_linklocal);
179 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
180 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
182 TAILQ_INIT(&V_in6_ifaddrhead);
183 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
186 /* Initialize packet filter hooks. */
187 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
188 V_inet6_pfil_hook.ph_af = AF_INET6;
189 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0)
190 printf("%s: WARNING: unable to register pfil hook, "
191 "error %d\n", __func__, i);
194 addrsel_policy_init();
199 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size",
200 &V_ip6_output_flowtable_size)) {
201 if (V_ip6_output_flowtable_size < 256)
202 V_ip6_output_flowtable_size = 256;
203 if (!powerof2(V_ip6_output_flowtable_size)) {
204 printf("flowtable must be power of 2 size\n");
205 V_ip6_output_flowtable_size = 2048;
209 * round up to the next power of 2
211 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1);
213 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU);
216 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
218 /* Skip global initialization stuff for non-default instances. */
219 if (!IS_DEFAULT_VNET(curvnet))
223 if (sizeof(struct protosw) != sizeof(struct ip6protosw))
224 panic("sizeof(protosw) != sizeof(ip6protosw)");
226 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
230 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
231 for (i = 0; i < IPPROTO_MAX; i++)
232 ip6_protox[i] = pr - inet6sw;
234 * Cycle through IP protocols and put them into the appropriate place
237 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
238 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
239 if (pr->pr_domain->dom_family == PF_INET6 &&
240 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
241 /* Be careful to only index valid IP protocols. */
242 if (pr->pr_protocol < IPPROTO_MAX)
243 ip6_protox[pr->pr_protocol] = pr - inet6sw;
246 netisr_register(&ip6_nh);
250 * The protocol to be inserted into ip6_protox[] must be already registered
251 * in inet6sw[], either statically or through pf_proto_register().
254 ip6proto_register(short ip6proto)
256 struct ip6protosw *pr;
259 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
260 return (EPROTONOSUPPORT);
263 * The protocol slot must not be occupied by another protocol
264 * already. An index pointing to IPPROTO_RAW is unused.
266 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
268 return (EPFNOSUPPORT);
269 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */
273 * Find the protocol position in inet6sw[] and set the index.
275 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
276 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) {
277 if (pr->pr_domain->dom_family == PF_INET6 &&
278 pr->pr_protocol && pr->pr_protocol == ip6proto) {
279 ip6_protox[pr->pr_protocol] = pr - inet6sw;
283 return (EPROTONOSUPPORT);
287 ip6proto_unregister(short ip6proto)
289 struct ip6protosw *pr;
292 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
293 return (EPROTONOSUPPORT);
295 /* Check if the protocol was indeed registered. */
296 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
298 return (EPFNOSUPPORT);
299 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */
302 /* Reset the protocol slot to IPPROTO_RAW. */
303 ip6_protox[ip6proto] = pr - inet6sw;
313 if ((i = pfil_head_unregister(&V_inet6_pfil_hook)) != 0)
314 printf("%s: WARNING: unable to unregister pfil hook, "
315 "error %d\n", __func__, i);
316 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
318 callout_drain(&V_in6_tmpaddrtimer_ch);
323 ip6_init2_vnet(const void *unused __unused)
327 callout_init(&V_nd6_timer_ch, 0);
328 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet);
330 /* timer for regeneranation of temporary addresses randomize ID */
331 callout_init(&V_in6_tmpaddrtimer_ch, 0);
332 callout_reset(&V_in6_tmpaddrtimer_ch,
333 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
334 V_ip6_temp_regen_advance) * hz,
335 in6_tmpaddrtimer, curvnet);
341 ip6_init2(void *dummy)
344 ip6_init2_vnet(NULL);
348 /* This must be after route_init(), which is now SI_ORDER_THIRD */
349 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
352 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off,
358 if (ip6_hopopts_input(plen, rtalert, &m, off)) {
359 #if 0 /*touches NULL pointer*/
360 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
362 goto out; /* m have already been freed */
366 ip6 = mtod(m, struct ip6_hdr *);
369 * if the payload length field is 0 and the next header field
370 * indicates Hop-by-Hop Options header, then a Jumbo Payload
371 * option MUST be included.
373 if (ip6->ip6_plen == 0 && *plen == 0) {
375 * Note that if a valid jumbo payload option is
376 * contained, ip6_hopopts_input() must set a valid
377 * (non-zero) payload length to the variable plen.
379 IP6STAT_INC(ip6s_badoptions);
380 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
381 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
382 icmp6_error(m, ICMP6_PARAM_PROB,
383 ICMP6_PARAMPROB_HEADER,
384 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
387 #ifndef PULLDOWN_TEST
388 /* ip6_hopopts_input() ensures that mbuf is contiguous */
389 hbh = (struct ip6_hbh *)(ip6 + 1);
391 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
392 sizeof(struct ip6_hbh));
394 IP6STAT_INC(ip6s_tooshort);
398 *nxt = hbh->ip6h_nxt;
401 * If we are acting as a router and the packet contains a
402 * router alert option, see if we know the option value.
403 * Currently, we only support the option value for MLD, in which
404 * case we should pass the packet to the multicast routing
407 if (*rtalert != ~0) {
409 case IP6OPT_RTALERT_MLD:
410 if (V_ip6_forwarding)
415 * RFC2711 requires unrecognized values must be
429 ip6_input(struct mbuf *m)
432 int off = sizeof(struct ip6_hdr), nest;
434 u_int32_t rtalert = ~0;
436 struct ifnet *deliverifp = NULL, *ifp = NULL;
437 struct in6_addr odst;
438 struct route_in6 rin6;
440 struct llentry *lle = NULL;
441 struct sockaddr_in6 dst6, *dst;
443 bzero(&rin6, sizeof(struct route_in6));
446 * should the inner packet be considered authentic?
447 * see comment in ah4_input().
448 * NB: m cannot be NULL when passed to the input routine
451 m->m_flags &= ~M_AUTHIPHDR;
452 m->m_flags &= ~M_AUTHIPDGM;
457 * make sure we don't have onion peering information into m_tag.
461 if (m->m_flags & M_FASTFWD_OURS) {
463 * Firewall changed destination to local.
465 m->m_flags &= ~M_FASTFWD_OURS;
467 deliverifp = m->m_pkthdr.rcvif;
468 ip6 = mtod(m, struct ip6_hdr *);
475 if (m->m_flags & M_EXT) {
477 IP6STAT_INC(ip6s_mext2m);
479 IP6STAT_INC(ip6s_mext1);
482 if (m->m_flags & M_LOOP) {
483 IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
484 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX)
486 ip6s_m2m[m->m_pkthdr.rcvif->if_index]);
488 IP6STAT_INC(ip6s_m2m[0]);
490 IP6STAT_INC(ip6s_m1);
493 /* drop the packet if IPv6 operation is disabled on the IF */
494 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
499 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
500 IP6STAT_INC(ip6s_total);
502 #ifndef PULLDOWN_TEST
504 * L2 bridge code and some other code can return mbuf chain
505 * that does not conform to KAME requirement. too bad.
506 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
508 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
511 if (m->m_pkthdr.len > MHLEN)
512 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
514 n = m_gethdr(M_NOWAIT, MT_DATA);
517 return; /* ENOBUFS */
521 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
522 n->m_len = n->m_pkthdr.len;
526 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */);
529 if (m->m_len < sizeof(struct ip6_hdr)) {
531 inifp = m->m_pkthdr.rcvif;
532 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
533 IP6STAT_INC(ip6s_toosmall);
534 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
539 ip6 = mtod(m, struct ip6_hdr *);
541 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
542 IP6STAT_INC(ip6s_badvers);
543 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
547 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
549 IP_PROBE(receive, NULL, NULL, ip6, m->m_pkthdr.rcvif, NULL, ip6);
552 * Check against address spoofing/corruption.
554 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
555 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
557 * XXX: "badscope" is not very suitable for a multicast source.
559 IP6STAT_INC(ip6s_badscope);
560 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
563 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
564 !(m->m_flags & M_LOOP)) {
566 * In this case, the packet should come from the loopback
567 * interface. However, we cannot just check the if_flags,
568 * because ip6_mloopback() passes the "actual" interface
569 * as the outgoing/incoming interface.
571 IP6STAT_INC(ip6s_badscope);
572 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
577 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
578 /* packet is dropped by traffic conditioner */
583 * The following check is not documented in specs. A malicious
584 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
585 * and bypass security checks (act as if it was from 127.0.0.1 by using
586 * IPv6 src ::ffff:127.0.0.1). Be cautious.
588 * This check chokes if we are in an SIIT cloud. As none of BSDs
589 * support IPv4-less kernel compilation, we cannot support SIIT
590 * environment at all. So, it makes more sense for us to reject any
591 * malicious packets for non-SIIT environment, than try to do a
592 * partial support for SIIT environment.
594 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
595 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
596 IP6STAT_INC(ip6s_badscope);
597 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
602 * Reject packets with IPv4 compatible addresses (auto tunnel).
604 * The code forbids auto tunnel relay case in RFC1933 (the check is
605 * stronger than RFC1933). We may want to re-enable it if mech-xx
606 * is revised to forbid relaying case.
608 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
609 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
610 IP6STAT_INC(ip6s_badscope);
611 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
617 * Bypass packet filtering for packets previously handled by IPsec.
619 if (ip6_ipsec_filtertunnel(m))
624 * Run through list of hooks for input packets.
626 * NB: Beware of the destination address changing
627 * (e.g. by NAT rewriting). When this happens,
628 * tell ip6_forward to do the right thing.
632 /* Jump over all PFIL processing if hooks are not active. */
633 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
636 if (pfil_run_hooks(&V_inet6_pfil_hook, &m,
637 m->m_pkthdr.rcvif, PFIL_IN, NULL))
639 if (m == NULL) /* consumed by filter */
641 ip6 = mtod(m, struct ip6_hdr *);
642 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
644 if (m->m_flags & M_FASTFWD_OURS) {
645 m->m_flags &= ~M_FASTFWD_OURS;
647 deliverifp = m->m_pkthdr.rcvif;
650 if ((m->m_flags & M_IP6_NEXTHOP) &&
651 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
653 * Directly ship the packet on. This allows forwarding
654 * packets originally destined to us to some other directly
663 * Disambiguate address scope zones (if there is ambiguity).
664 * We first make sure that the original source or destination address
665 * is not in our internal form for scoped addresses. Such addresses
666 * are not necessarily invalid spec-wise, but we cannot accept them due
667 * to the usage conflict.
668 * in6_setscope() then also checks and rejects the cases where src or
669 * dst are the loopback address and the receiving interface
672 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
673 IP6STAT_INC(ip6s_badscope); /* XXX */
676 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
677 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
678 IP6STAT_INC(ip6s_badscope);
683 * Multicast check. Assume packet is for us to avoid
684 * prematurely taking locks.
686 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
688 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
689 deliverifp = m->m_pkthdr.rcvif;
697 bzero(&dst6, sizeof(dst6));
698 dst6.sin6_family = AF_INET6;
699 dst6.sin6_len = sizeof(struct sockaddr_in6);
700 dst6.sin6_addr = ip6->ip6_dst;
701 ifp = m->m_pkthdr.rcvif;
702 IF_AFDATA_RLOCK(ifp);
703 lle = lla_lookup(LLTABLE6(ifp), 0,
704 (struct sockaddr *)&dst6);
705 IF_AFDATA_RUNLOCK(ifp);
706 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) {
708 struct in6_ifaddr *ia6;
712 #define sa_equal(a1, a2) \
713 (bcmp((a1), (a2), ((a1))->sin6_len) == 0)
715 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
716 if (ifa->ifa_addr->sa_family != dst6.sin6_family)
718 if (sa_equal(&dst6, ifa->ifa_addr))
721 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p",
725 ia6 = (struct in6_ifaddr *)ifa;
726 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
727 /* Count the packet in the ip address stats */
728 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1);
729 counter_u64_add(ia6->ia_ifa.ifa_ibytes,
733 * record address information into m_tag.
735 (void)ip6_setdstifaddr(m, ia6);
739 char ip6bufs[INET6_ADDRSTRLEN];
740 char ip6bufd[INET6_ADDRSTRLEN];
741 /* address is not ready, so discard the packet. */
743 "ip6_input: packet to an unready address %s->%s\n",
744 ip6_sprintf(ip6bufs, &ip6->ip6_src),
745 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
747 IF_ADDR_RUNLOCK(ifp);
761 dst->sin6_len = sizeof(struct sockaddr_in6);
762 dst->sin6_family = AF_INET6;
763 dst->sin6_addr = ip6->ip6_dst;
764 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m));
766 RT_UNLOCK(rin6.ro_rt);
768 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
771 * Accept the packet if the forwarding interface to the destination
772 * according to the routing table is the loopback interface,
773 * unless the associated route has a gateway.
774 * Note that this approach causes to accept a packet if there is a
775 * route to the loopback interface for the destination of the packet.
776 * But we think it's even useful in some situations, e.g. when using
777 * a special daemon which wants to intercept the packet.
779 * XXX: some OSes automatically make a cloned route for the destination
780 * of an outgoing packet. If the outgoing interface of the packet
781 * is a loopback one, the kernel would consider the packet to be
782 * accepted, even if we have no such address assinged on the interface.
783 * We check the cloned flag of the route entry to reject such cases,
784 * assuming that route entries for our own addresses are not made by
785 * cloning (it should be true because in6_addloop explicitly installs
786 * the host route). However, we might have to do an explicit check
787 * while it would be less efficient. Or, should we rather install a
788 * reject route for such a case?
791 (rin6.ro_rt->rt_flags &
792 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
794 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) &&
797 !(rin6.ro_rt->rt_flags & RTF_CLONED) &&
801 * The check below is redundant since the comparison of
802 * the destination and the key of the rtentry has
803 * already done through looking up the routing table.
805 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
806 &rt6_key(rin6.ro_rt)->sin6_addr)
808 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) {
810 struct in6_ifaddr *ia6;
813 * found the loopback route to the interface address
815 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) {
816 struct sockaddr_in6 dest6;
818 bzero(&dest6, sizeof(dest6));
819 dest6.sin6_family = AF_INET6;
820 dest6.sin6_len = sizeof(dest6);
821 dest6.sin6_addr = ip6->ip6_dst;
822 ia6 = (struct in6_ifaddr *)
823 ifa_ifwithaddr((struct sockaddr *)&dest6);
829 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa;
832 * record address information into m_tag.
834 (void)ip6_setdstifaddr(m, ia6);
837 * packets to a tentative, duplicated, or somehow invalid
838 * address must not be accepted.
840 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
841 /* this address is ready */
843 deliverifp = ia6->ia_ifp; /* correct? */
844 /* Count the packet in the ip address stats */
845 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1);
846 counter_u64_add(ia6->ia_ifa.ifa_ibytes,
849 ifa_free(&ia6->ia_ifa);
852 char ip6bufs[INET6_ADDRSTRLEN];
853 char ip6bufd[INET6_ADDRSTRLEN];
854 /* address is not ready, so discard the packet. */
856 "ip6_input: packet to an unready address %s->%s\n",
857 ip6_sprintf(ip6bufs, &ip6->ip6_src),
858 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
861 ifa_free(&ia6->ia_ifa);
867 * FAITH (Firewall Aided Internet Translator)
869 if (V_ip6_keepfaith) {
870 if (rin6.ro_rt && rin6.ro_rt->rt_ifp &&
871 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) {
872 /* XXX do we need more sanity checks? */
874 deliverifp = rin6.ro_rt->rt_ifp; /* faith */
880 * Now there is no reason to process the packet if it's not our own
881 * and we're not a router.
883 if (!V_ip6_forwarding) {
884 IP6STAT_INC(ip6s_cantforward);
885 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
891 * record address information into m_tag, if we don't have one yet.
892 * note that we are unable to record it, if the address is not listed
893 * as our interface address (e.g. multicast addresses, addresses
894 * within FAITH prefixes and such).
897 struct in6_ifaddr *ia6;
899 if ((ia6 = ip6_getdstifaddr(m)) != NULL) {
900 ifa_free(&ia6->ia_ifa);
902 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
904 if (!ip6_setdstifaddr(m, ia6)) {
906 * XXX maybe we should drop the packet here,
907 * as we could not provide enough information
908 * to the upper layers.
911 ifa_free(&ia6->ia_ifa);
917 * Process Hop-by-Hop options header if it's contained.
918 * m may be modified in ip6_hopopts_input().
919 * If a JumboPayload option is included, plen will also be modified.
921 plen = (u_int32_t)ntohs(ip6->ip6_plen);
922 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
925 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours);
932 * Check that the amount of data in the buffers
933 * is as at least much as the IPv6 header would have us expect.
934 * Trim mbufs if longer than we expect.
935 * Drop packet if shorter than we expect.
937 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
938 IP6STAT_INC(ip6s_tooshort);
939 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
942 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
943 if (m->m_len == m->m_pkthdr.len) {
944 m->m_len = sizeof(struct ip6_hdr) + plen;
945 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
947 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
951 * Forward if desirable.
954 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
956 * If we are acting as a multicast router, all
957 * incoming multicast packets are passed to the
958 * kernel-level multicast forwarding function.
959 * The packet is returned (relatively) intact; if
960 * ip6_mforward() returns a non-zero value, the packet
961 * must be discarded, else it may be accepted below.
963 * XXX TODO: Check hlim and multicast scope here to avoid
964 * unnecessarily calling into ip6_mforward().
967 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
968 IP6STAT_INC(ip6s_cantforward);
969 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
973 ip6_forward(m, srcrt);
977 ip6 = mtod(m, struct ip6_hdr *);
980 * Malicious party may be able to use IPv4 mapped addr to confuse
981 * tcp/udp stack and bypass security checks (act as if it was from
982 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
984 * For SIIT end node behavior, you may want to disable the check.
985 * However, you will become vulnerable to attacks using IPv4 mapped
988 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
989 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
990 IP6STAT_INC(ip6s_badscope);
991 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
996 * Tell launch routine the next header
998 IP6STAT_INC(ip6s_delivered);
999 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
1002 while (nxt != IPPROTO_DONE) {
1003 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
1004 IP6STAT_INC(ip6s_toomanyhdr);
1009 * protection against faulty packet - there should be
1010 * more sanity checks in header chain processing.
1012 if (m->m_pkthdr.len < off) {
1013 IP6STAT_INC(ip6s_tooshort);
1014 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1020 * enforce IPsec policy checking if we are seeing last header.
1021 * note that we do not visit this with protocols with pcb layer
1022 * code - like udp/tcp/raw ip.
1024 if (ip6_ipsec_input(m, nxt))
1029 * Use mbuf flags to propagate Router Alert option to
1030 * ICMPv6 layer, as hop-by-hop options have been stripped.
1032 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0)
1033 m->m_flags |= M_RTALERT_MLD;
1035 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
1046 * set/grab in6_ifaddr correspond to IPv6 destination address.
1047 * XXX backward compatibility wrapper
1049 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag,
1050 * and then bump it when the tag is copied, and release it when the tag is
1051 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead
1052 * we just bump the ia refcount when we receive it. This should be fixed.
1054 static struct ip6aux *
1055 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
1057 struct ip6aux *ip6a;
1059 ip6a = ip6_addaux(m);
1061 ip6a->ip6a_dstia6 = ia6;
1062 return ip6a; /* NULL if failed to set */
1066 ip6_getdstifaddr(struct mbuf *m)
1068 struct ip6aux *ip6a;
1069 struct in6_ifaddr *ia;
1071 ip6a = ip6_findaux(m);
1073 ia = ip6a->ip6a_dstia6;
1074 ifa_ref(&ia->ia_ifa);
1081 * Hop-by-Hop options header processing. If a valid jumbo payload option is
1082 * included, the real payload length will be stored in plenp.
1084 * rtalertp - XXX: should be stored more smart way
1087 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
1088 struct mbuf **mp, int *offp)
1090 struct mbuf *m = *mp;
1091 int off = *offp, hbhlen;
1092 struct ip6_hbh *hbh;
1095 /* validation of the length of the header */
1096 #ifndef PULLDOWN_TEST
1097 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
1098 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1099 hbhlen = (hbh->ip6h_len + 1) << 3;
1101 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
1102 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1104 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1105 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1107 IP6STAT_INC(ip6s_tooshort);
1110 hbhlen = (hbh->ip6h_len + 1) << 3;
1111 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
1114 IP6STAT_INC(ip6s_tooshort);
1119 hbhlen -= sizeof(struct ip6_hbh);
1120 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
1122 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
1123 hbhlen, rtalertp, plenp) < 0)
1132 * Search header for all Hop-by-hop options and process each option.
1133 * This function is separate from ip6_hopopts_input() in order to
1134 * handle a case where the sending node itself process its hop-by-hop
1135 * options header. In such a case, the function is called from ip6_output().
1137 * The function assumes that hbh header is located right after the IPv6 header
1138 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
1139 * opthead + hbhlen is located in contiguous memory region.
1142 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1143 u_int32_t *rtalertp, u_int32_t *plenp)
1145 struct ip6_hdr *ip6;
1147 u_int8_t *opt = opthead;
1148 u_int16_t rtalert_val;
1149 u_int32_t jumboplen;
1150 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1152 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1158 if (hbhlen < IP6OPT_MINLEN) {
1159 IP6STAT_INC(ip6s_toosmall);
1162 optlen = *(opt + 1) + 2;
1164 case IP6OPT_ROUTER_ALERT:
1165 /* XXX may need check for alignment */
1166 if (hbhlen < IP6OPT_RTALERT_LEN) {
1167 IP6STAT_INC(ip6s_toosmall);
1170 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1172 icmp6_error(m, ICMP6_PARAM_PROB,
1173 ICMP6_PARAMPROB_HEADER,
1174 erroff + opt + 1 - opthead);
1177 optlen = IP6OPT_RTALERT_LEN;
1178 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1179 *rtalertp = ntohs(rtalert_val);
1182 /* XXX may need check for alignment */
1183 if (hbhlen < IP6OPT_JUMBO_LEN) {
1184 IP6STAT_INC(ip6s_toosmall);
1187 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1189 icmp6_error(m, ICMP6_PARAM_PROB,
1190 ICMP6_PARAMPROB_HEADER,
1191 erroff + opt + 1 - opthead);
1194 optlen = IP6OPT_JUMBO_LEN;
1197 * IPv6 packets that have non 0 payload length
1198 * must not contain a jumbo payload option.
1200 ip6 = mtod(m, struct ip6_hdr *);
1201 if (ip6->ip6_plen) {
1202 IP6STAT_INC(ip6s_badoptions);
1203 icmp6_error(m, ICMP6_PARAM_PROB,
1204 ICMP6_PARAMPROB_HEADER,
1205 erroff + opt - opthead);
1210 * We may see jumbolen in unaligned location, so
1211 * we'd need to perform bcopy().
1213 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1214 jumboplen = (u_int32_t)htonl(jumboplen);
1218 * if there are multiple jumbo payload options,
1219 * *plenp will be non-zero and the packet will be
1221 * the behavior may need some debate in ipngwg -
1222 * multiple options does not make sense, however,
1223 * there's no explicit mention in specification.
1226 IP6STAT_INC(ip6s_badoptions);
1227 icmp6_error(m, ICMP6_PARAM_PROB,
1228 ICMP6_PARAMPROB_HEADER,
1229 erroff + opt + 2 - opthead);
1235 * jumbo payload length must be larger than 65535.
1237 if (jumboplen <= IPV6_MAXPACKET) {
1238 IP6STAT_INC(ip6s_badoptions);
1239 icmp6_error(m, ICMP6_PARAM_PROB,
1240 ICMP6_PARAMPROB_HEADER,
1241 erroff + opt + 2 - opthead);
1247 default: /* unknown option */
1248 if (hbhlen < IP6OPT_MINLEN) {
1249 IP6STAT_INC(ip6s_toosmall);
1252 optlen = ip6_unknown_opt(opt, m,
1253 erroff + opt - opthead);
1269 * Unknown option processing.
1270 * The third argument `off' is the offset from the IPv6 header to the option,
1271 * which is necessary if the IPv6 header the and option header and IPv6 header
1272 * is not contiguous in order to return an ICMPv6 error.
1275 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1277 struct ip6_hdr *ip6;
1279 switch (IP6OPT_TYPE(*optp)) {
1280 case IP6OPT_TYPE_SKIP: /* ignore the option */
1281 return ((int)*(optp + 1));
1282 case IP6OPT_TYPE_DISCARD: /* silently discard */
1285 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1286 IP6STAT_INC(ip6s_badoptions);
1287 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1289 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1290 IP6STAT_INC(ip6s_badoptions);
1291 ip6 = mtod(m, struct ip6_hdr *);
1292 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1293 (m->m_flags & (M_BCAST|M_MCAST)))
1296 icmp6_error(m, ICMP6_PARAM_PROB,
1297 ICMP6_PARAMPROB_OPTION, off);
1301 m_freem(m); /* XXX: NOTREACHED */
1306 * Create the "control" list for this pcb.
1307 * These functions will not modify mbuf chain at all.
1309 * With KAME mbuf chain restriction:
1310 * The routine will be called from upper layer handlers like tcp6_input().
1311 * Thus the routine assumes that the caller (tcp6_input) have already
1312 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1313 * very first mbuf on the mbuf chain.
1315 * ip6_savecontrol_v4 will handle those options that are possible to be
1316 * set on a v4-mapped socket.
1317 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1318 * options and handle the v6-only ones itself.
1321 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1324 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1327 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1331 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1332 SCM_TIMESTAMP, SOL_SOCKET);
1334 mp = &(*mp)->m_next;
1338 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1339 /* RFC 2292 sec. 5 */
1340 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1341 struct in6_pktinfo pi6;
1343 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1347 ip = mtod(m, struct ip *);
1348 pi6.ipi6_addr.s6_addr32[0] = 0;
1349 pi6.ipi6_addr.s6_addr32[1] = 0;
1350 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1351 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1353 /* We won't hit this code */
1354 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1357 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1358 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1361 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1363 *mp = sbcreatecontrol((caddr_t) &pi6,
1364 sizeof(struct in6_pktinfo),
1365 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1367 mp = &(*mp)->m_next;
1370 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1373 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1377 ip = mtod(m, struct ip *);
1380 /* We won't hit this code */
1384 hlim = ip6->ip6_hlim & 0xff;
1386 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1387 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1390 mp = &(*mp)->m_next;
1393 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1396 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1400 ip = mtod(m, struct ip *);
1401 tclass = ip->ip_tos;
1403 /* We won't hit this code */
1409 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1411 tclass = flowinfo & 0xff;
1413 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int),
1414 IPV6_TCLASS, IPPROTO_IPV6);
1416 mp = &(*mp)->m_next;
1419 if (v4only != NULL) {
1420 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1431 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
1433 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1436 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only);
1441 * IPV6_HOPOPTS socket option. Recall that we required super-user
1442 * privilege for the option (see ip6_ctloutput), but it might be too
1443 * strict, since there might be some hop-by-hop options which can be
1444 * returned to normal user.
1445 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1447 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
1449 * Check if a hop-by-hop options header is contatined in the
1450 * received packet, and if so, store the options as ancillary
1451 * data. Note that a hop-by-hop options header must be
1452 * just after the IPv6 header, which is assured through the
1453 * IPv6 input processing.
1455 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1456 struct ip6_hbh *hbh;
1458 #ifdef PULLDOWN_TEST
1462 #ifndef PULLDOWN_TEST
1463 hbh = (struct ip6_hbh *)(ip6 + 1);
1464 hbhlen = (hbh->ip6h_len + 1) << 3;
1466 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1469 IP6STAT_INC(ip6s_tooshort);
1472 hbh = mtod(ext, struct ip6_hbh *);
1473 hbhlen = (hbh->ip6h_len + 1) << 3;
1474 if (hbhlen != ext->m_len) {
1476 IP6STAT_INC(ip6s_tooshort);
1482 * XXX: We copy the whole header even if a
1483 * jumbo payload option is included, the option which
1484 * is to be removed before returning according to
1486 * Note: this constraint is removed in RFC3542
1488 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1489 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1492 mp = &(*mp)->m_next;
1493 #ifdef PULLDOWN_TEST
1499 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1500 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1503 * Search for destination options headers or routing
1504 * header(s) through the header chain, and stores each
1505 * header as ancillary data.
1506 * Note that the order of the headers remains in
1507 * the chain of ancillary data.
1509 while (1) { /* is explicit loop prevention necessary? */
1510 struct ip6_ext *ip6e = NULL;
1512 #ifdef PULLDOWN_TEST
1513 struct mbuf *ext = NULL;
1517 * if it is not an extension header, don't try to
1518 * pull it from the chain.
1521 case IPPROTO_DSTOPTS:
1522 case IPPROTO_ROUTING:
1523 case IPPROTO_HOPOPTS:
1524 case IPPROTO_AH: /* is it possible? */
1530 #ifndef PULLDOWN_TEST
1531 if (off + sizeof(*ip6e) > m->m_len)
1533 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1534 if (nxt == IPPROTO_AH)
1535 elen = (ip6e->ip6e_len + 2) << 2;
1537 elen = (ip6e->ip6e_len + 1) << 3;
1538 if (off + elen > m->m_len)
1541 ext = ip6_pullexthdr(m, off, nxt);
1543 IP6STAT_INC(ip6s_tooshort);
1546 ip6e = mtod(ext, struct ip6_ext *);
1547 if (nxt == IPPROTO_AH)
1548 elen = (ip6e->ip6e_len + 2) << 2;
1550 elen = (ip6e->ip6e_len + 1) << 3;
1551 if (elen != ext->m_len) {
1553 IP6STAT_INC(ip6s_tooshort);
1559 case IPPROTO_DSTOPTS:
1560 if (!(in6p->inp_flags & IN6P_DSTOPTS))
1563 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1565 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1568 mp = &(*mp)->m_next;
1570 case IPPROTO_ROUTING:
1571 if (!(in6p->inp_flags & IN6P_RTHDR))
1574 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1575 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
1578 mp = &(*mp)->m_next;
1580 case IPPROTO_HOPOPTS:
1581 case IPPROTO_AH: /* is it possible? */
1586 * other cases have been filtered in the above.
1587 * none will visit this case. here we supply
1588 * the code just in case (nxt overwritten or
1591 #ifdef PULLDOWN_TEST
1598 /* proceed with the next header. */
1600 nxt = ip6e->ip6e_nxt;
1602 #ifdef PULLDOWN_TEST
1614 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1618 struct ip6_mtuinfo mtuctl;
1620 so = in6p->inp_socket;
1626 if (so == NULL) /* I believe this is impossible */
1627 panic("ip6_notify_pmtu: socket is NULL");
1630 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1631 mtuctl.ip6m_mtu = *mtu;
1632 mtuctl.ip6m_addr = *dst;
1633 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1636 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1637 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1640 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1643 /* XXX: should count statistics */
1650 #ifdef PULLDOWN_TEST
1652 * pull single extension header from mbuf chain. returns single mbuf that
1653 * contains the result, or NULL on error.
1655 static struct mbuf *
1656 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1658 struct ip6_ext ip6e;
1664 case IPPROTO_DSTOPTS:
1665 case IPPROTO_ROUTING:
1666 case IPPROTO_HOPOPTS:
1667 case IPPROTO_AH: /* is it possible? */
1670 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1674 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1675 if (nxt == IPPROTO_AH)
1676 elen = (ip6e.ip6e_len + 2) << 2;
1678 elen = (ip6e.ip6e_len + 1) << 3;
1681 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1683 n = m_get(M_NOWAIT, MT_DATA);
1687 m_copydata(m, off, elen, mtod(n, caddr_t));
1694 * Get pointer to the previous header followed by the header
1695 * currently processed.
1696 * XXX: This function supposes that
1697 * M includes all headers,
1698 * the next header field and the header length field of each header
1700 * the sum of each header length equals to OFF.
1701 * Because of these assumptions, this function must be called very
1702 * carefully. Moreover, it will not be used in the near future when
1703 * we develop `neater' mechanism to process extension headers.
1706 ip6_get_prevhdr(struct mbuf *m, int off)
1708 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1710 if (off == sizeof(struct ip6_hdr))
1711 return (&ip6->ip6_nxt);
1714 struct ip6_ext *ip6e = NULL;
1717 len = sizeof(struct ip6_hdr);
1719 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1722 case IPPROTO_FRAGMENT:
1723 len += sizeof(struct ip6_frag);
1726 len += (ip6e->ip6e_len + 2) << 2;
1729 len += (ip6e->ip6e_len + 1) << 3;
1732 nxt = ip6e->ip6e_nxt;
1735 return (&ip6e->ip6e_nxt);
1742 * get next header offset. m will be retained.
1745 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1748 struct ip6_ext ip6e;
1753 panic("ip6_nexthdr: m == NULL");
1754 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1759 if (m->m_pkthdr.len < off + sizeof(ip6))
1761 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1763 *nxtp = ip6.ip6_nxt;
1767 case IPPROTO_FRAGMENT:
1769 * terminate parsing if it is not the first fragment,
1770 * it does not make sense to parse through it.
1772 if (m->m_pkthdr.len < off + sizeof(fh))
1774 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1775 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1776 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1779 *nxtp = fh.ip6f_nxt;
1780 off += sizeof(struct ip6_frag);
1784 if (m->m_pkthdr.len < off + sizeof(ip6e))
1786 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1788 *nxtp = ip6e.ip6e_nxt;
1789 off += (ip6e.ip6e_len + 2) << 2;
1792 case IPPROTO_HOPOPTS:
1793 case IPPROTO_ROUTING:
1794 case IPPROTO_DSTOPTS:
1795 if (m->m_pkthdr.len < off + sizeof(ip6e))
1797 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1799 *nxtp = ip6e.ip6e_nxt;
1800 off += (ip6e.ip6e_len + 1) << 3;
1805 case IPPROTO_IPCOMP:
1817 * get offset for the last header in the chain. m will be kept untainted.
1820 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1830 newoff = ip6_nexthdr(m, off, proto, nxtp);
1833 else if (newoff < off)
1834 return -1; /* invalid */
1835 else if (newoff == off)
1843 static struct ip6aux *
1844 ip6_addaux(struct mbuf *m)
1848 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1850 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
1853 m_tag_prepend(m, mtag);
1854 bzero(mtag + 1, sizeof(struct ip6aux));
1857 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1860 static struct ip6aux *
1861 ip6_findaux(struct mbuf *m)
1865 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1866 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1870 ip6_delaux(struct mbuf *m)
1874 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1876 m_tag_delete(m, mtag);
1880 * System control for IP6
1883 u_char inet6ctlerrmap[PRC_NCMDS] = {
1885 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1886 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1887 EMSGSIZE, EHOSTUNREACH, 0, 0,