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"
69 #include "opt_route.h"
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/hhook.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>
87 #include <sys/rmlock.h>
88 #include <sys/syslog.h>
89 #include <sys/sysctl.h>
92 #include <net/if_var.h>
93 #include <net/if_types.h>
94 #include <net/if_dl.h>
95 #include <net/route.h>
96 #include <net/netisr.h>
97 #include <net/rss_config.h>
101 #include <netinet/in.h>
102 #include <netinet/in_kdtrace.h>
103 #include <netinet/ip_var.h>
104 #include <netinet/in_systm.h>
105 #include <net/if_llatbl.h>
107 #include <netinet/ip.h>
108 #include <netinet/ip_icmp.h>
110 #include <netinet/ip6.h>
111 #include <netinet6/in6_var.h>
112 #include <netinet6/ip6_var.h>
113 #include <netinet/in_pcb.h>
114 #include <netinet/icmp6.h>
115 #include <netinet6/scope6_var.h>
116 #include <netinet6/in6_ifattach.h>
117 #include <netinet6/mld6_var.h>
118 #include <netinet6/nd6.h>
119 #include <netinet6/in6_rss.h>
122 #include <netipsec/key.h>
123 #include <netipsec/ipsec.h>
124 #include <netinet6/ip6_ipsec.h>
125 #include <netipsec/ipsec6.h>
128 #include <netinet6/ip6protosw.h>
130 extern struct domain inet6domain;
132 u_char ip6_protox[IPPROTO_MAX];
133 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
134 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl);
135 VNET_DEFINE(u_long, in6_ifaddrhmask);
137 static struct netisr_handler ip6_nh = {
139 .nh_handler = ip6_input,
140 .nh_proto = NETISR_IPV6,
142 .nh_m2cpuid = rss_soft_m2cpuid_v6,
143 .nh_policy = NETISR_POLICY_CPU,
144 .nh_dispatch = NETISR_DISPATCH_HYBRID,
146 .nh_policy = NETISR_POLICY_FLOW,
151 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
155 netisr_getqlimit(&ip6_nh, &qlimit);
156 error = sysctl_handle_int(oidp, &qlimit, 0, req);
157 if (error || !req->newptr)
161 return (netisr_setqlimit(&ip6_nh, qlimit));
163 SYSCTL_DECL(_net_inet6_ip6);
164 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen,
165 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet6_intr_queue_maxlen, "I",
166 "Maximum size of the IPv6 input queue");
169 static struct netisr_handler ip6_direct_nh = {
170 .nh_name = "ip6_direct",
171 .nh_handler = ip6_direct_input,
172 .nh_proto = NETISR_IPV6_DIRECT,
173 .nh_m2cpuid = rss_soft_m2cpuid_v6,
174 .nh_policy = NETISR_POLICY_CPU,
175 .nh_dispatch = NETISR_DISPATCH_HYBRID,
179 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
183 netisr_getqlimit(&ip6_direct_nh, &qlimit);
184 error = sysctl_handle_int(oidp, &qlimit, 0, req);
185 if (error || !req->newptr)
189 return (netisr_setqlimit(&ip6_direct_nh, qlimit));
191 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
192 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet6_intr_direct_queue_maxlen,
193 "I", "Maximum size of the IPv6 direct input queue");
197 VNET_DEFINE(struct pfil_head, inet6_pfil_hook);
199 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
200 VNET_PCPUSTAT_SYSINIT(ip6stat);
202 VNET_PCPUSTAT_SYSUNINIT(ip6stat);
205 struct rmlock in6_ifaddr_lock;
206 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
208 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
210 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
214 * IP6 initialization: fill in IP6 protocol switch table.
215 * All protocols not implemented in kernel go to raw IP6 protocol handler.
223 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
224 &V_ip6_auto_linklocal);
225 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
226 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
228 TAILQ_INIT(&V_in6_ifaddrhead);
229 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
232 /* Initialize packet filter hooks. */
233 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
234 V_inet6_pfil_hook.ph_af = AF_INET6;
235 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0)
236 printf("%s: WARNING: unable to register pfil hook, "
237 "error %d\n", __func__, i);
239 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6,
240 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6],
241 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
242 printf("%s: WARNING: unable to register input helper hook\n",
244 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6,
245 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6],
246 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
247 printf("%s: WARNING: unable to register output helper hook\n",
251 addrsel_policy_init();
255 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
257 /* Skip global initialization stuff for non-default instances. */
259 if (!IS_DEFAULT_VNET(curvnet)) {
260 netisr_register_vnet(&ip6_nh);
262 netisr_register_vnet(&ip6_direct_nh);
268 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
272 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
273 for (i = 0; i < IPPROTO_MAX; i++)
274 ip6_protox[i] = pr - inet6sw;
276 * Cycle through IP protocols and put them into the appropriate place
279 for (pr = inet6domain.dom_protosw;
280 pr < inet6domain.dom_protoswNPROTOSW; pr++)
281 if (pr->pr_domain->dom_family == PF_INET6 &&
282 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
283 /* Be careful to only index valid IP protocols. */
284 if (pr->pr_protocol < IPPROTO_MAX)
285 ip6_protox[pr->pr_protocol] = pr - inet6sw;
288 netisr_register(&ip6_nh);
290 netisr_register(&ip6_direct_nh);
295 * The protocol to be inserted into ip6_protox[] must be already registered
296 * in inet6sw[], either statically or through pf_proto_register().
299 ip6proto_register(short ip6proto)
304 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
305 return (EPROTONOSUPPORT);
308 * The protocol slot must not be occupied by another protocol
309 * already. An index pointing to IPPROTO_RAW is unused.
311 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
313 return (EPFNOSUPPORT);
314 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */
318 * Find the protocol position in inet6sw[] and set the index.
320 for (pr = inet6domain.dom_protosw;
321 pr < inet6domain.dom_protoswNPROTOSW; pr++) {
322 if (pr->pr_domain->dom_family == PF_INET6 &&
323 pr->pr_protocol && pr->pr_protocol == ip6proto) {
324 ip6_protox[pr->pr_protocol] = pr - inet6sw;
328 return (EPROTONOSUPPORT);
332 ip6proto_unregister(short ip6proto)
337 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
338 return (EPROTONOSUPPORT);
340 /* Check if the protocol was indeed registered. */
341 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
343 return (EPFNOSUPPORT);
344 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */
347 /* Reset the protocol slot to IPPROTO_RAW. */
348 ip6_protox[ip6proto] = pr - inet6sw;
354 ip6_destroy(void *unused __unused)
356 struct ifaddr *ifa, *nifa;
361 netisr_unregister_vnet(&ip6_direct_nh);
363 netisr_unregister_vnet(&ip6_nh);
365 if ((error = pfil_head_unregister(&V_inet6_pfil_hook)) != 0)
366 printf("%s: WARNING: unable to unregister pfil hook, "
367 "error %d\n", __func__, error);
368 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]);
370 printf("%s: WARNING: unable to deregister input helper hook "
371 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: "
372 "error %d returned\n", __func__, error);
374 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]);
376 printf("%s: WARNING: unable to deregister output helper hook "
377 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: "
378 "error %d returned\n", __func__, error);
381 /* Cleanup addresses. */
383 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
384 /* Cannot lock here - lock recursion. */
385 /* IF_ADDR_LOCK(ifp); */
386 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
388 if (ifa->ifa_addr->sa_family != AF_INET6)
392 /* IF_ADDR_UNLOCK(ifp); */
393 in6_ifdetach_destroy(ifp);
394 mld_domifdetach(ifp);
395 /* Make sure any routes are gone as well. */
396 rt_flushifroutes_af(ifp, AF_INET6);
401 in6_ifattach_destroy();
403 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
406 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL);
410 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off,
416 if (ip6_hopopts_input(plen, rtalert, &m, off)) {
417 #if 0 /*touches NULL pointer*/
418 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
420 goto out; /* m have already been freed */
424 ip6 = mtod(m, struct ip6_hdr *);
427 * if the payload length field is 0 and the next header field
428 * indicates Hop-by-Hop Options header, then a Jumbo Payload
429 * option MUST be included.
431 if (ip6->ip6_plen == 0 && *plen == 0) {
433 * Note that if a valid jumbo payload option is
434 * contained, ip6_hopopts_input() must set a valid
435 * (non-zero) payload length to the variable plen.
437 IP6STAT_INC(ip6s_badoptions);
438 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
439 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
440 icmp6_error(m, ICMP6_PARAM_PROB,
441 ICMP6_PARAMPROB_HEADER,
442 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
445 #ifndef PULLDOWN_TEST
446 /* ip6_hopopts_input() ensures that mbuf is contiguous */
447 hbh = (struct ip6_hbh *)(ip6 + 1);
449 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
450 sizeof(struct ip6_hbh));
452 IP6STAT_INC(ip6s_tooshort);
456 *nxt = hbh->ip6h_nxt;
459 * If we are acting as a router and the packet contains a
460 * router alert option, see if we know the option value.
461 * Currently, we only support the option value for MLD, in which
462 * case we should pass the packet to the multicast routing
465 if (*rtalert != ~0) {
467 case IP6OPT_RTALERT_MLD:
468 if (V_ip6_forwarding)
473 * RFC2711 requires unrecognized values must be
488 * IPv6 direct input routine.
490 * This is called when reinjecting completed fragments where
491 * all of the previous checking and book-keeping has been done.
494 ip6_direct_input(struct mbuf *m)
499 struct ip6_direct_ctx *ip6dc;
501 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL);
502 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!"));
504 ip6dc = (struct ip6_direct_ctx *)(mtag + 1);
505 nxt = ip6dc->ip6dc_nxt;
506 off = ip6dc->ip6dc_off;
510 m_tag_delete(m, mtag);
512 while (nxt != IPPROTO_DONE) {
513 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
514 IP6STAT_INC(ip6s_toomanyhdr);
519 * protection against faulty packet - there should be
520 * more sanity checks in header chain processing.
522 if (m->m_pkthdr.len < off) {
523 IP6STAT_INC(ip6s_tooshort);
524 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
530 * enforce IPsec policy checking if we are seeing last header.
531 * note that we do not visit this with protocols with pcb layer
532 * code - like udp/tcp/raw ip.
534 if (ip6_ipsec_input(m, nxt))
538 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
547 ip6_input(struct mbuf *m)
549 struct in6_addr odst;
551 struct in6_ifaddr *ia;
554 u_int32_t rtalert = ~0;
555 int off = sizeof(struct ip6_hdr), nest;
560 * Drop the packet if IPv6 operation is disabled on the interface.
562 rcvif = m->m_pkthdr.rcvif;
563 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED))
568 * should the inner packet be considered authentic?
569 * see comment in ah4_input().
570 * NB: m cannot be NULL when passed to the input routine
573 m->m_flags &= ~M_AUTHIPHDR;
574 m->m_flags &= ~M_AUTHIPDGM;
578 if (m->m_flags & M_FASTFWD_OURS) {
580 * Firewall changed destination to local.
582 m->m_flags &= ~M_FASTFWD_OURS;
584 ip6 = mtod(m, struct ip6_hdr *);
591 if (m->m_flags & M_EXT) {
593 IP6STAT_INC(ip6s_mext2m);
595 IP6STAT_INC(ip6s_mext1);
598 if (m->m_flags & M_LOOP) {
599 IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
600 } else if (rcvif->if_index < IP6S_M2MMAX)
601 IP6STAT_INC(ip6s_m2m[rcvif->if_index]);
603 IP6STAT_INC(ip6s_m2m[0]);
605 IP6STAT_INC(ip6s_m1);
608 in6_ifstat_inc(rcvif, ifs6_in_receive);
609 IP6STAT_INC(ip6s_total);
611 #ifndef PULLDOWN_TEST
613 * L2 bridge code and some other code can return mbuf chain
614 * that does not conform to KAME requirement. too bad.
615 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
617 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
620 if (m->m_pkthdr.len > MHLEN)
621 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
623 n = m_gethdr(M_NOWAIT, MT_DATA);
628 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
629 n->m_len = n->m_pkthdr.len;
633 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */);
636 if (m->m_len < sizeof(struct ip6_hdr)) {
637 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
638 IP6STAT_INC(ip6s_toosmall);
639 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
644 ip6 = mtod(m, struct ip6_hdr *);
645 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
646 IP6STAT_INC(ip6s_badvers);
647 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
651 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
652 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6);
655 * Check against address spoofing/corruption.
657 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
658 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
660 * XXX: "badscope" is not very suitable for a multicast source.
662 IP6STAT_INC(ip6s_badscope);
663 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
666 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
667 !(m->m_flags & M_LOOP)) {
669 * In this case, the packet should come from the loopback
670 * interface. However, we cannot just check the if_flags,
671 * because ip6_mloopback() passes the "actual" interface
672 * as the outgoing/incoming interface.
674 IP6STAT_INC(ip6s_badscope);
675 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
678 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
679 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) {
682 * Nodes must not originate a packet to a multicast address
683 * whose scop field contains the reserved value 0; if such
684 * a packet is received, it must be silently dropped.
686 IP6STAT_INC(ip6s_badscope);
687 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
691 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
692 /* packet is dropped by traffic conditioner */
697 * The following check is not documented in specs. A malicious
698 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
699 * and bypass security checks (act as if it was from 127.0.0.1 by using
700 * IPv6 src ::ffff:127.0.0.1). Be cautious.
702 * This check chokes if we are in an SIIT cloud. As none of BSDs
703 * support IPv4-less kernel compilation, we cannot support SIIT
704 * environment at all. So, it makes more sense for us to reject any
705 * malicious packets for non-SIIT environment, than try to do a
706 * partial support for SIIT environment.
708 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
709 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
710 IP6STAT_INC(ip6s_badscope);
711 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
716 * Reject packets with IPv4 compatible addresses (auto tunnel).
718 * The code forbids auto tunnel relay case in RFC1933 (the check is
719 * stronger than RFC1933). We may want to re-enable it if mech-xx
720 * is revised to forbid relaying case.
722 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
723 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
724 IP6STAT_INC(ip6s_badscope);
725 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
730 * Try to forward the packet, but if we fail continue.
731 * ip6_tryforward() does inbound and outbound packet firewall
732 * processing. If firewall has decided that destination becomes
733 * our local address, it sets M_FASTFWD_OURS flag. In this
734 * case skip another inbound firewall processing and update
737 if (V_ip6_forwarding != 0
739 && !key_havesp(IPSEC_DIR_INBOUND)
740 && !key_havesp(IPSEC_DIR_OUTBOUND)
743 if ((m = ip6_tryforward(m)) == NULL)
745 if (m->m_flags & M_FASTFWD_OURS) {
746 m->m_flags &= ~M_FASTFWD_OURS;
748 ip6 = mtod(m, struct ip6_hdr *);
754 * Bypass packet filtering for packets previously handled by IPsec.
756 if (ip6_ipsec_filtertunnel(m))
760 * Run through list of hooks for input packets.
762 * NB: Beware of the destination address changing
763 * (e.g. by NAT rewriting). When this happens,
764 * tell ip6_forward to do the right thing.
767 /* Jump over all PFIL processing if hooks are not active. */
768 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
772 if (pfil_run_hooks(&V_inet6_pfil_hook, &m,
773 m->m_pkthdr.rcvif, PFIL_IN, NULL))
775 if (m == NULL) /* consumed by filter */
777 ip6 = mtod(m, struct ip6_hdr *);
778 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
780 if (m->m_flags & M_FASTFWD_OURS) {
781 m->m_flags &= ~M_FASTFWD_OURS;
785 if ((m->m_flags & M_IP6_NEXTHOP) &&
786 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
788 * Directly ship the packet on. This allows forwarding
789 * packets originally destined to us to some other directly
798 * Disambiguate address scope zones (if there is ambiguity).
799 * We first make sure that the original source or destination address
800 * is not in our internal form for scoped addresses. Such addresses
801 * are not necessarily invalid spec-wise, but we cannot accept them due
802 * to the usage conflict.
803 * in6_setscope() then also checks and rejects the cases where src or
804 * dst are the loopback address and the receiving interface
807 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
808 IP6STAT_INC(ip6s_badscope); /* XXX */
811 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
812 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
813 IP6STAT_INC(ip6s_badscope);
817 * Multicast check. Assume packet is for us to avoid
818 * prematurely taking locks.
820 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
822 in6_ifstat_inc(rcvif, ifs6_in_mcast);
827 * XXX: For now we keep link-local IPv6 addresses with embedded
828 * scope zone id, therefore we use zero zoneid here.
830 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
832 if (ia->ia6_flags & IN6_IFF_NOTREADY) {
833 char ip6bufs[INET6_ADDRSTRLEN];
834 char ip6bufd[INET6_ADDRSTRLEN];
835 /* address is not ready, so discard the packet. */
837 "ip6_input: packet to an unready address %s->%s\n",
838 ip6_sprintf(ip6bufs, &ip6->ip6_src),
839 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
840 ifa_free(&ia->ia_ifa);
843 /* Count the packet in the ip address stats */
844 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
845 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);
846 ifa_free(&ia->ia_ifa);
852 * Now there is no reason to process the packet if it's not our own
853 * and we're not a router.
855 if (!V_ip6_forwarding) {
856 IP6STAT_INC(ip6s_cantforward);
862 * Process Hop-by-Hop options header if it's contained.
863 * m may be modified in ip6_hopopts_input().
864 * If a JumboPayload option is included, plen will also be modified.
866 plen = (u_int32_t)ntohs(ip6->ip6_plen);
867 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
868 if (ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours) != 0)
874 * Use mbuf flags to propagate Router Alert option to
875 * ICMPv6 layer, as hop-by-hop options have been stripped.
878 m->m_flags |= M_RTALERT_MLD;
881 * Check that the amount of data in the buffers
882 * is as at least much as the IPv6 header would have us expect.
883 * Trim mbufs if longer than we expect.
884 * Drop packet if shorter than we expect.
886 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
887 IP6STAT_INC(ip6s_tooshort);
888 in6_ifstat_inc(rcvif, ifs6_in_truncated);
891 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
892 if (m->m_len == m->m_pkthdr.len) {
893 m->m_len = sizeof(struct ip6_hdr) + plen;
894 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
896 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
900 * Forward if desirable.
903 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
905 * If we are acting as a multicast router, all
906 * incoming multicast packets are passed to the
907 * kernel-level multicast forwarding function.
908 * The packet is returned (relatively) intact; if
909 * ip6_mforward() returns a non-zero value, the packet
910 * must be discarded, else it may be accepted below.
912 * XXX TODO: Check hlim and multicast scope here to avoid
913 * unnecessarily calling into ip6_mforward().
915 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) {
916 IP6STAT_INC(ip6s_cantforward);
920 ip6_forward(m, srcrt);
924 ip6 = mtod(m, struct ip6_hdr *);
927 * Malicious party may be able to use IPv4 mapped addr to confuse
928 * tcp/udp stack and bypass security checks (act as if it was from
929 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
931 * For SIIT end node behavior, you may want to disable the check.
932 * However, you will become vulnerable to attacks using IPv4 mapped
935 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
936 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
937 IP6STAT_INC(ip6s_badscope);
938 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
943 * Tell launch routine the next header
945 IP6STAT_INC(ip6s_delivered);
946 in6_ifstat_inc(rcvif, ifs6_in_deliver);
949 while (nxt != IPPROTO_DONE) {
950 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
951 IP6STAT_INC(ip6s_toomanyhdr);
956 * protection against faulty packet - there should be
957 * more sanity checks in header chain processing.
959 if (m->m_pkthdr.len < off) {
960 IP6STAT_INC(ip6s_tooshort);
961 in6_ifstat_inc(rcvif, ifs6_in_truncated);
967 * enforce IPsec policy checking if we are seeing last header.
968 * note that we do not visit this with protocols with pcb layer
969 * code - like udp/tcp/raw ip.
971 if (ip6_ipsec_input(m, nxt))
975 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
979 in6_ifstat_inc(rcvif, ifs6_in_discard);
985 * Hop-by-Hop options header processing. If a valid jumbo payload option is
986 * included, the real payload length will be stored in plenp.
988 * rtalertp - XXX: should be stored more smart way
991 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
992 struct mbuf **mp, int *offp)
994 struct mbuf *m = *mp;
995 int off = *offp, hbhlen;
998 /* validation of the length of the header */
999 #ifndef PULLDOWN_TEST
1000 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
1001 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1002 hbhlen = (hbh->ip6h_len + 1) << 3;
1004 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
1005 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1007 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1008 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1010 IP6STAT_INC(ip6s_tooshort);
1013 hbhlen = (hbh->ip6h_len + 1) << 3;
1014 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
1017 IP6STAT_INC(ip6s_tooshort);
1022 hbhlen -= sizeof(struct ip6_hbh);
1023 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
1024 hbhlen, rtalertp, plenp) < 0)
1033 * Search header for all Hop-by-hop options and process each option.
1034 * This function is separate from ip6_hopopts_input() in order to
1035 * handle a case where the sending node itself process its hop-by-hop
1036 * options header. In such a case, the function is called from ip6_output().
1038 * The function assumes that hbh header is located right after the IPv6 header
1039 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
1040 * opthead + hbhlen is located in contiguous memory region.
1043 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1044 u_int32_t *rtalertp, u_int32_t *plenp)
1046 struct ip6_hdr *ip6;
1048 u_int8_t *opt = opthead;
1049 u_int16_t rtalert_val;
1050 u_int32_t jumboplen;
1051 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1053 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1059 if (hbhlen < IP6OPT_MINLEN) {
1060 IP6STAT_INC(ip6s_toosmall);
1063 optlen = *(opt + 1) + 2;
1065 case IP6OPT_ROUTER_ALERT:
1066 /* XXX may need check for alignment */
1067 if (hbhlen < IP6OPT_RTALERT_LEN) {
1068 IP6STAT_INC(ip6s_toosmall);
1071 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1073 icmp6_error(m, ICMP6_PARAM_PROB,
1074 ICMP6_PARAMPROB_HEADER,
1075 erroff + opt + 1 - opthead);
1078 optlen = IP6OPT_RTALERT_LEN;
1079 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1080 *rtalertp = ntohs(rtalert_val);
1083 /* XXX may need check for alignment */
1084 if (hbhlen < IP6OPT_JUMBO_LEN) {
1085 IP6STAT_INC(ip6s_toosmall);
1088 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1090 icmp6_error(m, ICMP6_PARAM_PROB,
1091 ICMP6_PARAMPROB_HEADER,
1092 erroff + opt + 1 - opthead);
1095 optlen = IP6OPT_JUMBO_LEN;
1098 * IPv6 packets that have non 0 payload length
1099 * must not contain a jumbo payload option.
1101 ip6 = mtod(m, struct ip6_hdr *);
1102 if (ip6->ip6_plen) {
1103 IP6STAT_INC(ip6s_badoptions);
1104 icmp6_error(m, ICMP6_PARAM_PROB,
1105 ICMP6_PARAMPROB_HEADER,
1106 erroff + opt - opthead);
1111 * We may see jumbolen in unaligned location, so
1112 * we'd need to perform bcopy().
1114 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1115 jumboplen = (u_int32_t)htonl(jumboplen);
1119 * if there are multiple jumbo payload options,
1120 * *plenp will be non-zero and the packet will be
1122 * the behavior may need some debate in ipngwg -
1123 * multiple options does not make sense, however,
1124 * there's no explicit mention in specification.
1127 IP6STAT_INC(ip6s_badoptions);
1128 icmp6_error(m, ICMP6_PARAM_PROB,
1129 ICMP6_PARAMPROB_HEADER,
1130 erroff + opt + 2 - opthead);
1136 * jumbo payload length must be larger than 65535.
1138 if (jumboplen <= IPV6_MAXPACKET) {
1139 IP6STAT_INC(ip6s_badoptions);
1140 icmp6_error(m, ICMP6_PARAM_PROB,
1141 ICMP6_PARAMPROB_HEADER,
1142 erroff + opt + 2 - opthead);
1148 default: /* unknown option */
1149 if (hbhlen < IP6OPT_MINLEN) {
1150 IP6STAT_INC(ip6s_toosmall);
1153 optlen = ip6_unknown_opt(opt, m,
1154 erroff + opt - opthead);
1170 * Unknown option processing.
1171 * The third argument `off' is the offset from the IPv6 header to the option,
1172 * which is necessary if the IPv6 header the and option header and IPv6 header
1173 * is not contiguous in order to return an ICMPv6 error.
1176 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1178 struct ip6_hdr *ip6;
1180 switch (IP6OPT_TYPE(*optp)) {
1181 case IP6OPT_TYPE_SKIP: /* ignore the option */
1182 return ((int)*(optp + 1));
1183 case IP6OPT_TYPE_DISCARD: /* silently discard */
1186 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1187 IP6STAT_INC(ip6s_badoptions);
1188 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1190 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1191 IP6STAT_INC(ip6s_badoptions);
1192 ip6 = mtod(m, struct ip6_hdr *);
1193 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1194 (m->m_flags & (M_BCAST|M_MCAST)))
1197 icmp6_error(m, ICMP6_PARAM_PROB,
1198 ICMP6_PARAMPROB_OPTION, off);
1202 m_freem(m); /* XXX: NOTREACHED */
1207 * Create the "control" list for this pcb.
1208 * These functions will not modify mbuf chain at all.
1210 * With KAME mbuf chain restriction:
1211 * The routine will be called from upper layer handlers like tcp6_input().
1212 * Thus the routine assumes that the caller (tcp6_input) have already
1213 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1214 * very first mbuf on the mbuf chain.
1216 * ip6_savecontrol_v4 will handle those options that are possible to be
1217 * set on a v4-mapped socket.
1218 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1219 * options and handle the v6-only ones itself.
1222 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1225 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1228 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1232 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1233 SCM_TIMESTAMP, SOL_SOCKET);
1235 mp = &(*mp)->m_next;
1239 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1240 /* RFC 2292 sec. 5 */
1241 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1242 struct in6_pktinfo pi6;
1244 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1248 ip = mtod(m, struct ip *);
1249 pi6.ipi6_addr.s6_addr32[0] = 0;
1250 pi6.ipi6_addr.s6_addr32[1] = 0;
1251 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1252 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1254 /* We won't hit this code */
1255 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1258 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1259 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1262 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1264 *mp = sbcreatecontrol((caddr_t) &pi6,
1265 sizeof(struct in6_pktinfo),
1266 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1268 mp = &(*mp)->m_next;
1271 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1274 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1278 ip = mtod(m, struct ip *);
1281 /* We won't hit this code */
1285 hlim = ip6->ip6_hlim & 0xff;
1287 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1288 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1291 mp = &(*mp)->m_next;
1294 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1297 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1301 ip = mtod(m, struct ip *);
1302 tclass = ip->ip_tos;
1304 /* We won't hit this code */
1310 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1312 tclass = flowinfo & 0xff;
1314 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int),
1315 IPV6_TCLASS, IPPROTO_IPV6);
1317 mp = &(*mp)->m_next;
1320 if (v4only != NULL) {
1321 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1332 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
1334 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1337 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only);
1342 * IPV6_HOPOPTS socket option. Recall that we required super-user
1343 * privilege for the option (see ip6_ctloutput), but it might be too
1344 * strict, since there might be some hop-by-hop options which can be
1345 * returned to normal user.
1346 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1348 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
1350 * Check if a hop-by-hop options header is contatined in the
1351 * received packet, and if so, store the options as ancillary
1352 * data. Note that a hop-by-hop options header must be
1353 * just after the IPv6 header, which is assured through the
1354 * IPv6 input processing.
1356 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1357 struct ip6_hbh *hbh;
1359 #ifdef PULLDOWN_TEST
1363 #ifndef PULLDOWN_TEST
1364 hbh = (struct ip6_hbh *)(ip6 + 1);
1365 hbhlen = (hbh->ip6h_len + 1) << 3;
1367 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1370 IP6STAT_INC(ip6s_tooshort);
1373 hbh = mtod(ext, struct ip6_hbh *);
1374 hbhlen = (hbh->ip6h_len + 1) << 3;
1375 if (hbhlen != ext->m_len) {
1377 IP6STAT_INC(ip6s_tooshort);
1383 * XXX: We copy the whole header even if a
1384 * jumbo payload option is included, the option which
1385 * is to be removed before returning according to
1387 * Note: this constraint is removed in RFC3542
1389 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1390 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1393 mp = &(*mp)->m_next;
1394 #ifdef PULLDOWN_TEST
1400 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1401 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1404 * Search for destination options headers or routing
1405 * header(s) through the header chain, and stores each
1406 * header as ancillary data.
1407 * Note that the order of the headers remains in
1408 * the chain of ancillary data.
1410 while (1) { /* is explicit loop prevention necessary? */
1411 struct ip6_ext *ip6e = NULL;
1413 #ifdef PULLDOWN_TEST
1414 struct mbuf *ext = NULL;
1418 * if it is not an extension header, don't try to
1419 * pull it from the chain.
1422 case IPPROTO_DSTOPTS:
1423 case IPPROTO_ROUTING:
1424 case IPPROTO_HOPOPTS:
1425 case IPPROTO_AH: /* is it possible? */
1431 #ifndef PULLDOWN_TEST
1432 if (off + sizeof(*ip6e) > m->m_len)
1434 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1435 if (nxt == IPPROTO_AH)
1436 elen = (ip6e->ip6e_len + 2) << 2;
1438 elen = (ip6e->ip6e_len + 1) << 3;
1439 if (off + elen > m->m_len)
1442 ext = ip6_pullexthdr(m, off, nxt);
1444 IP6STAT_INC(ip6s_tooshort);
1447 ip6e = mtod(ext, struct ip6_ext *);
1448 if (nxt == IPPROTO_AH)
1449 elen = (ip6e->ip6e_len + 2) << 2;
1451 elen = (ip6e->ip6e_len + 1) << 3;
1452 if (elen != ext->m_len) {
1454 IP6STAT_INC(ip6s_tooshort);
1460 case IPPROTO_DSTOPTS:
1461 if (!(in6p->inp_flags & IN6P_DSTOPTS))
1464 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1466 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1469 mp = &(*mp)->m_next;
1471 case IPPROTO_ROUTING:
1472 if (!(in6p->inp_flags & IN6P_RTHDR))
1475 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1476 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
1479 mp = &(*mp)->m_next;
1481 case IPPROTO_HOPOPTS:
1482 case IPPROTO_AH: /* is it possible? */
1487 * other cases have been filtered in the above.
1488 * none will visit this case. here we supply
1489 * the code just in case (nxt overwritten or
1492 #ifdef PULLDOWN_TEST
1499 /* proceed with the next header. */
1501 nxt = ip6e->ip6e_nxt;
1503 #ifdef PULLDOWN_TEST
1512 if (in6p->inp_flags2 & INP_RECVFLOWID) {
1513 uint32_t flowid, flow_type;
1515 flowid = m->m_pkthdr.flowid;
1516 flow_type = M_HASHTYPE_GET(m);
1519 * XXX should handle the failure of one or the
1520 * other - don't populate both?
1522 *mp = sbcreatecontrol((caddr_t) &flowid,
1523 sizeof(uint32_t), IPV6_FLOWID, IPPROTO_IPV6);
1525 mp = &(*mp)->m_next;
1526 *mp = sbcreatecontrol((caddr_t) &flow_type,
1527 sizeof(uint32_t), IPV6_FLOWTYPE, IPPROTO_IPV6);
1529 mp = &(*mp)->m_next;
1533 if (in6p->inp_flags2 & INP_RECVRSSBUCKETID) {
1534 uint32_t flowid, flow_type;
1535 uint32_t rss_bucketid;
1537 flowid = m->m_pkthdr.flowid;
1538 flow_type = M_HASHTYPE_GET(m);
1540 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
1541 *mp = sbcreatecontrol((caddr_t) &rss_bucketid,
1542 sizeof(uint32_t), IPV6_RSSBUCKETID, IPPROTO_IPV6);
1544 mp = &(*mp)->m_next;
1553 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu)
1557 struct ip6_mtuinfo mtuctl;
1559 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1561 * Notify the error by sending IPV6_PATHMTU ancillary data if
1562 * application wanted to know the MTU value.
1563 * NOTE: we notify disconnected sockets, because some udp
1564 * applications keep sending sockets disconnected.
1565 * NOTE: our implementation doesn't notify connected sockets that has
1566 * foreign address that is different than given destination addresses
1567 * (this is permitted by RFC 3542).
1569 if ((inp->inp_flags & IN6P_MTU) == 0 || (
1570 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1571 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr)))
1574 mtuctl.ip6m_mtu = mtu;
1575 mtuctl.ip6m_addr = *dst;
1576 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1579 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1580 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1583 so = inp->inp_socket;
1584 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1587 /* XXX: should count statistics */
1592 #ifdef PULLDOWN_TEST
1594 * pull single extension header from mbuf chain. returns single mbuf that
1595 * contains the result, or NULL on error.
1597 static struct mbuf *
1598 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1600 struct ip6_ext ip6e;
1606 case IPPROTO_DSTOPTS:
1607 case IPPROTO_ROUTING:
1608 case IPPROTO_HOPOPTS:
1609 case IPPROTO_AH: /* is it possible? */
1612 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1616 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1617 if (nxt == IPPROTO_AH)
1618 elen = (ip6e.ip6e_len + 2) << 2;
1620 elen = (ip6e.ip6e_len + 1) << 3;
1623 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1625 n = m_get(M_NOWAIT, MT_DATA);
1629 m_copydata(m, off, elen, mtod(n, caddr_t));
1636 * Get pointer to the previous header followed by the header
1637 * currently processed.
1638 * XXX: This function supposes that
1639 * M includes all headers,
1640 * the next header field and the header length field of each header
1642 * the sum of each header length equals to OFF.
1643 * Because of these assumptions, this function must be called very
1644 * carefully. Moreover, it will not be used in the near future when
1645 * we develop `neater' mechanism to process extension headers.
1648 ip6_get_prevhdr(const struct mbuf *m, int off)
1650 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1652 if (off == sizeof(struct ip6_hdr))
1653 return (&ip6->ip6_nxt);
1656 struct ip6_ext *ip6e = NULL;
1659 len = sizeof(struct ip6_hdr);
1661 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1664 case IPPROTO_FRAGMENT:
1665 len += sizeof(struct ip6_frag);
1668 len += (ip6e->ip6e_len + 2) << 2;
1671 len += (ip6e->ip6e_len + 1) << 3;
1674 nxt = ip6e->ip6e_nxt;
1677 return (&ip6e->ip6e_nxt);
1684 * get next header offset. m will be retained.
1687 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1690 struct ip6_ext ip6e;
1695 panic("ip6_nexthdr: m == NULL");
1696 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1701 if (m->m_pkthdr.len < off + sizeof(ip6))
1703 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1705 *nxtp = ip6.ip6_nxt;
1709 case IPPROTO_FRAGMENT:
1711 * terminate parsing if it is not the first fragment,
1712 * it does not make sense to parse through it.
1714 if (m->m_pkthdr.len < off + sizeof(fh))
1716 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1717 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1718 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1721 *nxtp = fh.ip6f_nxt;
1722 off += sizeof(struct ip6_frag);
1726 if (m->m_pkthdr.len < off + sizeof(ip6e))
1728 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1730 *nxtp = ip6e.ip6e_nxt;
1731 off += (ip6e.ip6e_len + 2) << 2;
1734 case IPPROTO_HOPOPTS:
1735 case IPPROTO_ROUTING:
1736 case IPPROTO_DSTOPTS:
1737 if (m->m_pkthdr.len < off + sizeof(ip6e))
1739 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1741 *nxtp = ip6e.ip6e_nxt;
1742 off += (ip6e.ip6e_len + 1) << 3;
1747 case IPPROTO_IPCOMP:
1759 * get offset for the last header in the chain. m will be kept untainted.
1762 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1772 newoff = ip6_nexthdr(m, off, proto, nxtp);
1775 else if (newoff < off)
1776 return -1; /* invalid */
1777 else if (newoff == off)
1786 * System control for IP6
1789 u_char inet6ctlerrmap[PRC_NCMDS] = {
1791 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1792 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1793 EMSGSIZE, EHOSTUNREACH, 0, 0,
1794 0, 0, EHOSTUNREACH, 0,
1795 ENOPROTOOPT, ECONNREFUSED