2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $
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. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD$");
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
71 #include "opt_route.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/hhook.h>
77 #include <sys/malloc.h>
80 #include <sys/domain.h>
81 #include <sys/protosw.h>
83 #include <sys/socket.h>
84 #include <sys/socketvar.h>
85 #include <sys/errno.h>
87 #include <sys/kernel.h>
89 #include <sys/rmlock.h>
90 #include <sys/syslog.h>
91 #include <sys/sysctl.h>
94 #include <net/if_var.h>
95 #include <net/if_types.h>
96 #include <net/if_dl.h>
97 #include <net/route.h>
98 #include <net/netisr.h>
99 #include <net/rss_config.h>
100 #include <net/pfil.h>
101 #include <net/vnet.h>
103 #include <netinet/in.h>
104 #include <netinet/in_kdtrace.h>
105 #include <netinet/ip_var.h>
106 #include <netinet/in_systm.h>
107 #include <net/if_llatbl.h>
109 #include <netinet/ip.h>
110 #include <netinet/ip_icmp.h>
112 #include <netinet/ip6.h>
113 #include <netinet6/in6_var.h>
114 #include <netinet6/ip6_var.h>
115 #include <netinet/in_pcb.h>
116 #include <netinet/icmp6.h>
117 #include <netinet6/scope6_var.h>
118 #include <netinet6/in6_ifattach.h>
119 #include <netinet6/mld6_var.h>
120 #include <netinet6/nd6.h>
121 #include <netinet6/in6_rss.h>
123 #include <netipsec/ipsec_support.h>
125 #include <netinet6/ip6protosw.h>
127 extern struct domain inet6domain;
129 u_char ip6_protox[IPPROTO_MAX];
130 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
131 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl);
132 VNET_DEFINE(u_long, in6_ifaddrhmask);
134 static struct netisr_handler ip6_nh = {
136 .nh_handler = ip6_input,
137 .nh_proto = NETISR_IPV6,
139 .nh_m2cpuid = rss_soft_m2cpuid_v6,
140 .nh_policy = NETISR_POLICY_CPU,
141 .nh_dispatch = NETISR_DISPATCH_HYBRID,
143 .nh_policy = NETISR_POLICY_FLOW,
148 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
152 netisr_getqlimit(&ip6_nh, &qlimit);
153 error = sysctl_handle_int(oidp, &qlimit, 0, req);
154 if (error || !req->newptr)
158 return (netisr_setqlimit(&ip6_nh, qlimit));
160 SYSCTL_DECL(_net_inet6_ip6);
161 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen,
162 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
163 0, 0, sysctl_netinet6_intr_queue_maxlen, "I",
164 "Maximum size of the IPv6 input queue");
166 VNET_DEFINE_STATIC(bool, ip6_sav) = true;
167 #define V_ip6_sav VNET(ip6_sav)
168 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, source_address_validation,
169 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sav), true,
170 "Drop incoming packets with source address that is a local address");
173 static struct netisr_handler ip6_direct_nh = {
174 .nh_name = "ip6_direct",
175 .nh_handler = ip6_direct_input,
176 .nh_proto = NETISR_IPV6_DIRECT,
177 .nh_m2cpuid = rss_soft_m2cpuid_v6,
178 .nh_policy = NETISR_POLICY_CPU,
179 .nh_dispatch = NETISR_DISPATCH_HYBRID,
183 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
187 netisr_getqlimit(&ip6_direct_nh, &qlimit);
188 error = sysctl_handle_int(oidp, &qlimit, 0, req);
189 if (error || !req->newptr)
193 return (netisr_setqlimit(&ip6_direct_nh, qlimit));
195 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
196 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
197 0, 0, sysctl_netinet6_intr_direct_queue_maxlen, "I",
198 "Maximum size of the IPv6 direct input queue");
202 VNET_DEFINE(pfil_head_t, inet6_pfil_head);
204 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
205 VNET_PCPUSTAT_SYSINIT(ip6stat);
207 VNET_PCPUSTAT_SYSUNINIT(ip6stat);
210 struct rmlock in6_ifaddr_lock;
211 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
213 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
216 * IP6 initialization: fill in IP6 protocol switch table.
217 * All protocols not implemented in kernel go to raw IP6 protocol handler.
222 struct pfil_head_args args;
226 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
227 &V_ip6_auto_linklocal);
228 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
229 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
231 CK_STAILQ_INIT(&V_in6_ifaddrhead);
232 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
235 /* Initialize packet filter hooks. */
236 args.pa_version = PFIL_VERSION;
237 args.pa_flags = PFIL_IN | PFIL_OUT;
238 args.pa_type = PFIL_TYPE_IP6;
239 args.pa_headname = PFIL_INET6_NAME;
240 V_inet6_pfil_head = pfil_head_register(&args);
242 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6,
243 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6],
244 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
245 printf("%s: WARNING: unable to register input helper hook\n",
247 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6,
248 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6],
249 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
250 printf("%s: WARNING: unable to register output helper hook\n",
254 addrsel_policy_init();
258 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
260 /* Skip global initialization stuff for non-default instances. */
262 if (!IS_DEFAULT_VNET(curvnet)) {
263 netisr_register_vnet(&ip6_nh);
265 netisr_register_vnet(&ip6_direct_nh);
271 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
275 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
276 for (i = 0; i < IPPROTO_MAX; i++)
277 ip6_protox[i] = pr - inet6sw;
279 * Cycle through IP protocols and put them into the appropriate place
282 for (pr = inet6domain.dom_protosw;
283 pr < inet6domain.dom_protoswNPROTOSW; pr++)
284 if (pr->pr_domain->dom_family == PF_INET6 &&
285 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
286 /* Be careful to only index valid IP protocols. */
287 if (pr->pr_protocol < IPPROTO_MAX)
288 ip6_protox[pr->pr_protocol] = pr - inet6sw;
291 netisr_register(&ip6_nh);
293 netisr_register(&ip6_direct_nh);
298 * The protocol to be inserted into ip6_protox[] must be already registered
299 * in inet6sw[], either statically or through pf_proto_register().
302 ip6proto_register(short ip6proto)
307 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
308 return (EPROTONOSUPPORT);
311 * The protocol slot must not be occupied by another protocol
312 * already. An index pointing to IPPROTO_RAW is unused.
314 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
316 return (EPFNOSUPPORT);
317 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */
321 * Find the protocol position in inet6sw[] and set the index.
323 for (pr = inet6domain.dom_protosw;
324 pr < inet6domain.dom_protoswNPROTOSW; pr++) {
325 if (pr->pr_domain->dom_family == PF_INET6 &&
326 pr->pr_protocol && pr->pr_protocol == ip6proto) {
327 ip6_protox[pr->pr_protocol] = pr - inet6sw;
331 return (EPROTONOSUPPORT);
335 ip6proto_unregister(short ip6proto)
340 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
341 return (EPROTONOSUPPORT);
343 /* Check if the protocol was indeed registered. */
344 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
346 return (EPFNOSUPPORT);
347 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */
350 /* Reset the protocol slot to IPPROTO_RAW. */
351 ip6_protox[ip6proto] = pr - inet6sw;
357 ip6_destroy(void *unused __unused)
359 struct ifaddr *ifa, *nifa;
364 netisr_unregister_vnet(&ip6_direct_nh);
366 netisr_unregister_vnet(&ip6_nh);
368 pfil_head_unregister(V_inet6_pfil_head);
369 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]);
371 printf("%s: WARNING: unable to deregister input helper hook "
372 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: "
373 "error %d returned\n", __func__, error);
375 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]);
377 printf("%s: WARNING: unable to deregister output helper hook "
378 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: "
379 "error %d returned\n", __func__, error);
382 /* Cleanup addresses. */
384 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
385 /* Cannot lock here - lock recursion. */
386 /* IF_ADDR_LOCK(ifp); */
387 CK_STAILQ_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);
398 /* Make sure any routes are gone as well. */
399 rib_flush_routes_family(AF_INET6);
403 in6_ifattach_destroy();
405 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
408 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL);
412 ip6_input_hbh(struct mbuf **mp, uint32_t *plen, uint32_t *rtalert, int *off,
419 if (ip6_hopopts_input(plen, rtalert, mp, off)) {
420 #if 0 /*touches NULL pointer*/
421 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard);
423 goto out; /* m have already been freed */
428 ip6 = mtod(m, struct ip6_hdr *);
431 * if the payload length field is 0 and the next header field
432 * indicates Hop-by-Hop Options header, then a Jumbo Payload
433 * option MUST be included.
435 if (ip6->ip6_plen == 0 && *plen == 0) {
437 * Note that if a valid jumbo payload option is
438 * contained, ip6_hopopts_input() must set a valid
439 * (non-zero) payload length to the variable plen.
441 IP6STAT_INC(ip6s_badoptions);
442 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
443 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
444 icmp6_error(m, ICMP6_PARAM_PROB,
445 ICMP6_PARAMPROB_HEADER,
446 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
449 /* ip6_hopopts_input() ensures that mbuf is contiguous */
450 hbh = (struct ip6_hbh *)(ip6 + 1);
451 *nxt = hbh->ip6h_nxt;
454 * If we are acting as a router and the packet contains a
455 * router alert option, see if we know the option value.
456 * Currently, we only support the option value for MLD, in which
457 * case we should pass the packet to the multicast routing
460 if (*rtalert != ~0) {
462 case IP6OPT_RTALERT_MLD:
463 if (V_ip6_forwarding)
468 * RFC2711 requires unrecognized values must be
483 * IPv6 direct input routine.
485 * This is called when reinjecting completed fragments where
486 * all of the previous checking and book-keeping has been done.
489 ip6_direct_input(struct mbuf *m)
494 struct ip6_direct_ctx *ip6dc;
496 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL);
497 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!"));
499 ip6dc = (struct ip6_direct_ctx *)(mtag + 1);
500 nxt = ip6dc->ip6dc_nxt;
501 off = ip6dc->ip6dc_off;
505 m_tag_delete(m, mtag);
507 while (nxt != IPPROTO_DONE) {
508 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
509 IP6STAT_INC(ip6s_toomanyhdr);
514 * protection against faulty packet - there should be
515 * more sanity checks in header chain processing.
517 if (m->m_pkthdr.len < off) {
518 IP6STAT_INC(ip6s_tooshort);
519 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
523 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
524 if (IPSEC_ENABLED(ipv6)) {
525 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
530 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
539 ip6_input(struct mbuf *m)
541 struct in6_addr odst;
543 struct in6_ifaddr *ia;
546 u_int32_t rtalert = ~0;
547 int off = sizeof(struct ip6_hdr), nest;
552 * Drop the packet if IPv6 operation is disabled on the interface.
554 rcvif = m->m_pkthdr.rcvif;
555 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED))
558 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
560 * should the inner packet be considered authentic?
561 * see comment in ah4_input().
562 * NB: m cannot be NULL when passed to the input routine
565 m->m_flags &= ~M_AUTHIPHDR;
566 m->m_flags &= ~M_AUTHIPDGM;
570 if (m->m_flags & M_FASTFWD_OURS) {
572 * Firewall changed destination to local.
574 ip6 = mtod(m, struct ip6_hdr *);
581 if (m->m_flags & M_EXT) {
583 IP6STAT_INC(ip6s_mext2m);
585 IP6STAT_INC(ip6s_mext1);
588 if (m->m_flags & M_LOOP) {
589 IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
590 } else if (rcvif->if_index < IP6S_M2MMAX)
591 IP6STAT_INC(ip6s_m2m[rcvif->if_index]);
593 IP6STAT_INC(ip6s_m2m[0]);
595 IP6STAT_INC(ip6s_m1);
598 in6_ifstat_inc(rcvif, ifs6_in_receive);
599 IP6STAT_INC(ip6s_total);
602 * L2 bridge code and some other code can return mbuf chain
603 * that does not conform to KAME requirement. too bad.
604 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
606 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
609 if (m->m_pkthdr.len > MHLEN)
610 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
612 n = m_gethdr(M_NOWAIT, MT_DATA);
617 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
618 n->m_len = n->m_pkthdr.len;
622 if (m->m_len < sizeof(struct ip6_hdr)) {
623 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
624 IP6STAT_INC(ip6s_toosmall);
625 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
630 ip6 = mtod(m, struct ip6_hdr *);
631 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
632 IP6STAT_INC(ip6s_badvers);
633 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
637 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
638 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6);
641 * Check against address spoofing/corruption.
643 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
644 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
646 * XXX: "badscope" is not very suitable for a multicast source.
648 IP6STAT_INC(ip6s_badscope);
649 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
652 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
653 !(m->m_flags & M_LOOP)) {
655 * In this case, the packet should come from the loopback
656 * interface. However, we cannot just check the if_flags,
657 * because ip6_mloopback() passes the "actual" interface
658 * as the outgoing/incoming interface.
660 IP6STAT_INC(ip6s_badscope);
661 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
664 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
665 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) {
668 * Nodes must not originate a packet to a multicast address
669 * whose scop field contains the reserved value 0; if such
670 * a packet is received, it must be silently dropped.
672 IP6STAT_INC(ip6s_badscope);
673 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
677 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
678 /* packet is dropped by traffic conditioner */
683 * The following check is not documented in specs. A malicious
684 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
685 * and bypass security checks (act as if it was from 127.0.0.1 by using
686 * IPv6 src ::ffff:127.0.0.1). Be cautious.
688 * We have supported IPv6-only kernels for a few years and this issue
689 * has not come up. The world seems to move mostly towards not using
690 * v4mapped on the wire, so it makes sense for us to keep rejecting
693 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
694 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
695 IP6STAT_INC(ip6s_badscope);
696 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
701 * Reject packets with IPv4 compatible addresses (auto tunnel).
703 * The code forbids auto tunnel relay case in RFC1933 (the check is
704 * stronger than RFC1933). We may want to re-enable it if mech-xx
705 * is revised to forbid relaying case.
707 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
708 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
709 IP6STAT_INC(ip6s_badscope);
710 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
715 * Try to forward the packet, but if we fail continue.
716 * ip6_tryforward() does not generate redirects, so fall
717 * through to normal processing if redirects are required.
718 * ip6_tryforward() does inbound and outbound packet firewall
719 * processing. If firewall has decided that destination becomes
720 * our local address, it sets M_FASTFWD_OURS flag. In this
721 * case skip another inbound firewall processing and update
724 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0
725 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
726 && (!IPSEC_ENABLED(ipv6) ||
727 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0)
730 if ((m = ip6_tryforward(m)) == NULL)
732 if (m->m_flags & M_FASTFWD_OURS) {
733 ip6 = mtod(m, struct ip6_hdr *);
737 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
739 * Bypass packet filtering for packets previously handled by IPsec.
741 if (IPSEC_ENABLED(ipv6) &&
742 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0)
746 * Run through list of hooks for input packets.
748 * NB: Beware of the destination address changing
749 * (e.g. by NAT rewriting). When this happens,
750 * tell ip6_forward to do the right thing.
753 /* Jump over all PFIL processing if hooks are not active. */
754 if (!PFIL_HOOKED_IN(V_inet6_pfil_head))
758 if (pfil_run_hooks(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, PFIL_IN,
761 ip6 = mtod(m, struct ip6_hdr *);
762 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
763 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP &&
764 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
766 * Directly ship the packet on. This allows forwarding
767 * packets originally destined to us to some other directly
776 * Disambiguate address scope zones (if there is ambiguity).
777 * We first make sure that the original source or destination address
778 * is not in our internal form for scoped addresses. Such addresses
779 * are not necessarily invalid spec-wise, but we cannot accept them due
780 * to the usage conflict.
781 * in6_setscope() then also checks and rejects the cases where src or
782 * dst are the loopback address and the receiving interface
785 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
786 IP6STAT_INC(ip6s_badscope); /* XXX */
789 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
790 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
791 IP6STAT_INC(ip6s_badscope);
794 if (m->m_flags & M_FASTFWD_OURS) {
795 m->m_flags &= ~M_FASTFWD_OURS;
800 * Multicast check. Assume packet is for us to avoid
801 * prematurely taking locks.
803 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
805 in6_ifstat_inc(rcvif, ifs6_in_mcast);
810 * XXX: For now we keep link-local IPv6 addresses with embedded
811 * scope zone id, therefore we use zero zoneid here.
813 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
815 if (ia->ia6_flags & IN6_IFF_NOTREADY) {
816 char ip6bufs[INET6_ADDRSTRLEN];
817 char ip6bufd[INET6_ADDRSTRLEN];
818 /* address is not ready, so discard the packet. */
820 "ip6_input: packet to an unready address %s->%s\n",
821 ip6_sprintf(ip6bufs, &ip6->ip6_src),
822 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
825 if (V_ip6_sav && !(rcvif->if_flags & IFF_LOOPBACK) &&
826 __predict_false(in6_localip_fib(&ip6->ip6_src,
828 IP6STAT_INC(ip6s_badscope); /* XXX */
831 /* Count the packet in the ip address stats */
832 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
833 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);
839 * Now there is no reason to process the packet if it's not our own
840 * and we're not a router.
842 if (!V_ip6_forwarding) {
843 IP6STAT_INC(ip6s_cantforward);
849 * Process Hop-by-Hop options header if it's contained.
850 * m may be modified in ip6_hopopts_input().
851 * If a JumboPayload option is included, plen will also be modified.
853 plen = (u_int32_t)ntohs(ip6->ip6_plen);
854 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
855 if (ip6_input_hbh(&m, &plen, &rtalert, &off, &nxt, &ours) != 0)
861 * Use mbuf flags to propagate Router Alert option to
862 * ICMPv6 layer, as hop-by-hop options have been stripped.
865 m->m_flags |= M_RTALERT_MLD;
868 * Check that the amount of data in the buffers
869 * is as at least much as the IPv6 header would have us expect.
870 * Trim mbufs if longer than we expect.
871 * Drop packet if shorter than we expect.
873 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
874 IP6STAT_INC(ip6s_tooshort);
875 in6_ifstat_inc(rcvif, ifs6_in_truncated);
878 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
879 if (m->m_len == m->m_pkthdr.len) {
880 m->m_len = sizeof(struct ip6_hdr) + plen;
881 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
883 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
887 * Forward if desirable.
890 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
892 * If we are acting as a multicast router, all
893 * incoming multicast packets are passed to the
894 * kernel-level multicast forwarding function.
895 * The packet is returned (relatively) intact; if
896 * ip6_mforward() returns a non-zero value, the packet
897 * must be discarded, else it may be accepted below.
899 * XXX TODO: Check hlim and multicast scope here to avoid
900 * unnecessarily calling into ip6_mforward().
902 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) {
903 IP6STAT_INC(ip6s_cantforward);
907 ip6_forward(m, srcrt);
912 * Tell launch routine the next header
914 IP6STAT_INC(ip6s_delivered);
915 in6_ifstat_inc(rcvif, ifs6_in_deliver);
918 while (nxt != IPPROTO_DONE) {
919 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
920 IP6STAT_INC(ip6s_toomanyhdr);
925 * protection against faulty packet - there should be
926 * more sanity checks in header chain processing.
928 if (m->m_pkthdr.len < off) {
929 IP6STAT_INC(ip6s_tooshort);
930 in6_ifstat_inc(rcvif, ifs6_in_truncated);
934 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
935 if (IPSEC_ENABLED(ipv6)) {
936 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
941 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
945 in6_ifstat_inc(rcvif, ifs6_in_discard);
951 * Hop-by-Hop options header processing. If a valid jumbo payload option is
952 * included, the real payload length will be stored in plenp.
954 * rtalertp - XXX: should be stored more smart way
957 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
958 struct mbuf **mp, int *offp)
960 struct mbuf *m = *mp;
961 int off = *offp, hbhlen;
964 /* validation of the length of the header */
965 if (m->m_len < off + sizeof(*hbh)) {
966 m = m_pullup(m, off + sizeof(*hbh));
968 IP6STAT_INC(ip6s_exthdrtoolong);
973 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
974 hbhlen = (hbh->ip6h_len + 1) << 3;
976 if (m->m_len < off + hbhlen) {
977 m = m_pullup(m, off + hbhlen);
979 IP6STAT_INC(ip6s_exthdrtoolong);
984 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
986 hbhlen -= sizeof(struct ip6_hbh);
987 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
988 hbhlen, rtalertp, plenp) < 0) {
999 * Search header for all Hop-by-hop options and process each option.
1000 * This function is separate from ip6_hopopts_input() in order to
1001 * handle a case where the sending node itself process its hop-by-hop
1002 * options header. In such a case, the function is called from ip6_output().
1004 * The function assumes that hbh header is located right after the IPv6 header
1005 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
1006 * opthead + hbhlen is located in contiguous memory region.
1009 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1010 u_int32_t *rtalertp, u_int32_t *plenp)
1012 struct ip6_hdr *ip6;
1014 u_int8_t *opt = opthead;
1015 u_int16_t rtalert_val;
1016 u_int32_t jumboplen;
1017 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1019 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1025 if (hbhlen < IP6OPT_MINLEN) {
1026 IP6STAT_INC(ip6s_toosmall);
1029 optlen = *(opt + 1) + 2;
1031 case IP6OPT_ROUTER_ALERT:
1032 /* XXX may need check for alignment */
1033 if (hbhlen < IP6OPT_RTALERT_LEN) {
1034 IP6STAT_INC(ip6s_toosmall);
1037 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1039 icmp6_error(m, ICMP6_PARAM_PROB,
1040 ICMP6_PARAMPROB_HEADER,
1041 erroff + opt + 1 - opthead);
1044 optlen = IP6OPT_RTALERT_LEN;
1045 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1046 *rtalertp = ntohs(rtalert_val);
1049 /* XXX may need check for alignment */
1050 if (hbhlen < IP6OPT_JUMBO_LEN) {
1051 IP6STAT_INC(ip6s_toosmall);
1054 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1056 icmp6_error(m, ICMP6_PARAM_PROB,
1057 ICMP6_PARAMPROB_HEADER,
1058 erroff + opt + 1 - opthead);
1061 optlen = IP6OPT_JUMBO_LEN;
1064 * IPv6 packets that have non 0 payload length
1065 * must not contain a jumbo payload option.
1067 ip6 = mtod(m, struct ip6_hdr *);
1068 if (ip6->ip6_plen) {
1069 IP6STAT_INC(ip6s_badoptions);
1070 icmp6_error(m, ICMP6_PARAM_PROB,
1071 ICMP6_PARAMPROB_HEADER,
1072 erroff + opt - opthead);
1077 * We may see jumbolen in unaligned location, so
1078 * we'd need to perform bcopy().
1080 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1081 jumboplen = (u_int32_t)htonl(jumboplen);
1085 * if there are multiple jumbo payload options,
1086 * *plenp will be non-zero and the packet will be
1088 * the behavior may need some debate in ipngwg -
1089 * multiple options does not make sense, however,
1090 * there's no explicit mention in specification.
1093 IP6STAT_INC(ip6s_badoptions);
1094 icmp6_error(m, ICMP6_PARAM_PROB,
1095 ICMP6_PARAMPROB_HEADER,
1096 erroff + opt + 2 - opthead);
1102 * jumbo payload length must be larger than 65535.
1104 if (jumboplen <= IPV6_MAXPACKET) {
1105 IP6STAT_INC(ip6s_badoptions);
1106 icmp6_error(m, ICMP6_PARAM_PROB,
1107 ICMP6_PARAMPROB_HEADER,
1108 erroff + opt + 2 - opthead);
1114 default: /* unknown option */
1115 if (hbhlen < IP6OPT_MINLEN) {
1116 IP6STAT_INC(ip6s_toosmall);
1119 optlen = ip6_unknown_opt(opt, m,
1120 erroff + opt - opthead);
1136 * Unknown option processing.
1137 * The third argument `off' is the offset from the IPv6 header to the option,
1138 * which is necessary if the IPv6 header the and option header and IPv6 header
1139 * is not contiguous in order to return an ICMPv6 error.
1142 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1144 struct ip6_hdr *ip6;
1146 switch (IP6OPT_TYPE(*optp)) {
1147 case IP6OPT_TYPE_SKIP: /* ignore the option */
1148 return ((int)*(optp + 1));
1149 case IP6OPT_TYPE_DISCARD: /* silently discard */
1152 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1153 IP6STAT_INC(ip6s_badoptions);
1154 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1156 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1157 IP6STAT_INC(ip6s_badoptions);
1158 ip6 = mtod(m, struct ip6_hdr *);
1159 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1160 (m->m_flags & (M_BCAST|M_MCAST)))
1163 icmp6_error(m, ICMP6_PARAM_PROB,
1164 ICMP6_PARAMPROB_OPTION, off);
1168 m_freem(m); /* XXX: NOTREACHED */
1173 * Create the "control" list for this pcb.
1174 * These functions will not modify mbuf chain at all.
1176 * The routine will be called from upper layer handlers like tcp6_input().
1177 * Thus the routine assumes that the caller (tcp6_input) have already
1178 * called m_pullup() and all the extension headers are located in the
1179 * very first mbuf on the mbuf chain.
1181 * ip6_savecontrol_v4 will handle those options that are possible to be
1182 * set on a v4-mapped socket.
1183 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1184 * options and handle the v6-only ones itself.
1187 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1190 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1193 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1199 struct bintime boottimebin, bt1;
1200 struct timespec ts1;
1204 switch (inp->inp_socket->so_ts_clock) {
1205 case SO_TS_REALTIME_MICRO:
1206 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1208 mbuf_tstmp2timespec(m, &ts1);
1209 timespec2bintime(&ts1, &bt1);
1210 getboottimebin(&boottimebin);
1211 bintime_add(&bt1, &boottimebin);
1212 bintime2timeval(&bt1, &t.tv);
1216 *mp = sbcreatecontrol((caddr_t) &t.tv, sizeof(t.tv),
1217 SCM_TIMESTAMP, SOL_SOCKET);
1219 mp = &(*mp)->m_next;
1225 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1227 mbuf_tstmp2timespec(m, &ts1);
1228 timespec2bintime(&ts1, &t.bt);
1229 getboottimebin(&boottimebin);
1230 bintime_add(&t.bt, &boottimebin);
1234 *mp = sbcreatecontrol((caddr_t)&t.bt, sizeof(t.bt),
1235 SCM_BINTIME, SOL_SOCKET);
1237 mp = &(*mp)->m_next;
1242 case SO_TS_REALTIME:
1243 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1245 mbuf_tstmp2timespec(m, &t.ts);
1246 getboottimebin(&boottimebin);
1247 bintime2timespec(&boottimebin, &ts1);
1248 timespecadd(&t.ts, &ts1, &t.ts);
1252 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts),
1253 SCM_REALTIME, SOL_SOCKET);
1255 mp = &(*mp)->m_next;
1260 case SO_TS_MONOTONIC:
1261 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1263 mbuf_tstmp2timespec(m, &t.ts);
1266 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts),
1267 SCM_MONOTONIC, SOL_SOCKET);
1269 mp = &(*mp)->m_next;
1275 panic("unknown (corrupted) so_ts_clock");
1277 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) ==
1278 (M_PKTHDR | M_TSTMP)) {
1279 struct sock_timestamp_info sti;
1281 bzero(&sti, sizeof(sti));
1282 sti.st_info_flags = ST_INFO_HW;
1283 if ((m->m_flags & M_TSTMP_HPREC) != 0)
1284 sti.st_info_flags |= ST_INFO_HW_HPREC;
1285 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti),
1286 SCM_TIME_INFO, SOL_SOCKET);
1288 mp = &(*mp)->m_next;
1293 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1294 /* RFC 2292 sec. 5 */
1295 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1296 struct in6_pktinfo pi6;
1298 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1302 ip = mtod(m, struct ip *);
1303 pi6.ipi6_addr.s6_addr32[0] = 0;
1304 pi6.ipi6_addr.s6_addr32[1] = 0;
1305 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1306 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1308 /* We won't hit this code */
1309 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1312 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1313 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1316 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1318 *mp = sbcreatecontrol((caddr_t) &pi6,
1319 sizeof(struct in6_pktinfo),
1320 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1322 mp = &(*mp)->m_next;
1325 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1328 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1332 ip = mtod(m, struct ip *);
1335 /* We won't hit this code */
1339 hlim = ip6->ip6_hlim & 0xff;
1341 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1342 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1345 mp = &(*mp)->m_next;
1348 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1351 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1355 ip = mtod(m, struct ip *);
1356 tclass = ip->ip_tos;
1358 /* We won't hit this code */
1364 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1366 tclass = flowinfo & 0xff;
1368 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int),
1369 IPV6_TCLASS, IPPROTO_IPV6);
1371 mp = &(*mp)->m_next;
1374 if (v4only != NULL) {
1375 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1386 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp)
1388 struct ip6_hdr *ip6;
1391 mp = ip6_savecontrol_v4(inp, m, mp, &v4only);
1395 ip6 = mtod(m, struct ip6_hdr *);
1397 * IPV6_HOPOPTS socket option. Recall that we required super-user
1398 * privilege for the option (see ip6_ctloutput), but it might be too
1399 * strict, since there might be some hop-by-hop options which can be
1400 * returned to normal user.
1401 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1403 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) {
1405 * Check if a hop-by-hop options header is contatined in the
1406 * received packet, and if so, store the options as ancillary
1407 * data. Note that a hop-by-hop options header must be
1408 * just after the IPv6 header, which is assured through the
1409 * IPv6 input processing.
1411 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1412 struct ip6_hbh *hbh;
1415 hbh = (struct ip6_hbh *)(ip6 + 1);
1416 hbhlen = (hbh->ip6h_len + 1) << 3;
1419 * XXX: We copy the whole header even if a
1420 * jumbo payload option is included, the option which
1421 * is to be removed before returning according to
1423 * Note: this constraint is removed in RFC3542
1425 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1426 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1429 mp = &(*mp)->m_next;
1433 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1434 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1437 * Search for destination options headers or routing
1438 * header(s) through the header chain, and stores each
1439 * header as ancillary data.
1440 * Note that the order of the headers remains in
1441 * the chain of ancillary data.
1443 while (1) { /* is explicit loop prevention necessary? */
1444 struct ip6_ext *ip6e = NULL;
1448 * if it is not an extension header, don't try to
1449 * pull it from the chain.
1452 case IPPROTO_DSTOPTS:
1453 case IPPROTO_ROUTING:
1454 case IPPROTO_HOPOPTS:
1455 case IPPROTO_AH: /* is it possible? */
1461 if (off + sizeof(*ip6e) > m->m_len)
1463 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1464 if (nxt == IPPROTO_AH)
1465 elen = (ip6e->ip6e_len + 2) << 2;
1467 elen = (ip6e->ip6e_len + 1) << 3;
1468 if (off + elen > m->m_len)
1472 case IPPROTO_DSTOPTS:
1473 if (!(inp->inp_flags & IN6P_DSTOPTS))
1476 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1478 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1481 mp = &(*mp)->m_next;
1483 case IPPROTO_ROUTING:
1484 if (!(inp->inp_flags & IN6P_RTHDR))
1487 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1488 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR),
1491 mp = &(*mp)->m_next;
1493 case IPPROTO_HOPOPTS:
1494 case IPPROTO_AH: /* is it possible? */
1499 * other cases have been filtered in the above.
1500 * none will visit this case. here we supply
1501 * the code just in case (nxt overwritten or
1507 /* proceed with the next header. */
1509 nxt = ip6e->ip6e_nxt;
1516 if (inp->inp_flags2 & INP_RECVFLOWID) {
1517 uint32_t flowid, flow_type;
1519 flowid = m->m_pkthdr.flowid;
1520 flow_type = M_HASHTYPE_GET(m);
1523 * XXX should handle the failure of one or the
1524 * other - don't populate both?
1526 *mp = sbcreatecontrol((caddr_t) &flowid,
1527 sizeof(uint32_t), IPV6_FLOWID, IPPROTO_IPV6);
1529 mp = &(*mp)->m_next;
1530 *mp = sbcreatecontrol((caddr_t) &flow_type,
1531 sizeof(uint32_t), IPV6_FLOWTYPE, IPPROTO_IPV6);
1533 mp = &(*mp)->m_next;
1537 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) {
1538 uint32_t flowid, flow_type;
1539 uint32_t rss_bucketid;
1541 flowid = m->m_pkthdr.flowid;
1542 flow_type = M_HASHTYPE_GET(m);
1544 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
1545 *mp = sbcreatecontrol((caddr_t) &rss_bucketid,
1546 sizeof(uint32_t), IPV6_RSSBUCKETID, IPPROTO_IPV6);
1548 mp = &(*mp)->m_next;
1557 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu)
1561 struct ip6_mtuinfo mtuctl;
1563 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1565 * Notify the error by sending IPV6_PATHMTU ancillary data if
1566 * application wanted to know the MTU value.
1567 * NOTE: we notify disconnected sockets, because some udp
1568 * applications keep sending sockets disconnected.
1569 * NOTE: our implementation doesn't notify connected sockets that has
1570 * foreign address that is different than given destination addresses
1571 * (this is permitted by RFC 3542).
1573 if ((inp->inp_flags & IN6P_MTU) == 0 || (
1574 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1575 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr)))
1578 mtuctl.ip6m_mtu = mtu;
1579 mtuctl.ip6m_addr = *dst;
1580 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1583 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1584 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1587 so = inp->inp_socket;
1588 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1592 /* XXX: should count statistics */
1598 * Get pointer to the previous header followed by the header
1599 * currently processed.
1602 ip6_get_prevhdr(const struct mbuf *m, int off)
1604 struct ip6_ext ip6e;
1605 struct ip6_hdr *ip6;
1608 if (off == sizeof(struct ip6_hdr))
1609 return (offsetof(struct ip6_hdr, ip6_nxt));
1610 if (off < sizeof(struct ip6_hdr))
1611 panic("%s: off < sizeof(struct ip6_hdr)", __func__);
1613 ip6 = mtod(m, struct ip6_hdr *);
1615 len = sizeof(struct ip6_hdr);
1618 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e);
1620 case IPPROTO_FRAGMENT:
1621 nlen = sizeof(struct ip6_frag);
1624 nlen = (ip6e.ip6e_len + 2) << 2;
1627 nlen = (ip6e.ip6e_len + 1) << 3;
1630 nxt = ip6e.ip6e_nxt;
1632 return (len - nlen);
1636 * get next header offset. m will be retained.
1639 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1642 struct ip6_ext ip6e;
1647 panic("ip6_nexthdr: m == NULL");
1648 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1653 if (m->m_pkthdr.len < off + sizeof(ip6))
1655 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1657 *nxtp = ip6.ip6_nxt;
1661 case IPPROTO_FRAGMENT:
1663 * terminate parsing if it is not the first fragment,
1664 * it does not make sense to parse through it.
1666 if (m->m_pkthdr.len < off + sizeof(fh))
1668 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1669 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1670 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1673 *nxtp = fh.ip6f_nxt;
1674 off += sizeof(struct ip6_frag);
1678 if (m->m_pkthdr.len < off + sizeof(ip6e))
1680 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1682 *nxtp = ip6e.ip6e_nxt;
1683 off += (ip6e.ip6e_len + 2) << 2;
1686 case IPPROTO_HOPOPTS:
1687 case IPPROTO_ROUTING:
1688 case IPPROTO_DSTOPTS:
1689 if (m->m_pkthdr.len < off + sizeof(ip6e))
1691 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1693 *nxtp = ip6e.ip6e_nxt;
1694 off += (ip6e.ip6e_len + 1) << 3;
1699 case IPPROTO_IPCOMP:
1711 * get offset for the last header in the chain. m will be kept untainted.
1714 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1724 newoff = ip6_nexthdr(m, off, proto, nxtp);
1727 else if (newoff < off)
1728 return -1; /* invalid */
1729 else if (newoff == off)
1738 * System control for IP6
1741 u_char inet6ctlerrmap[PRC_NCMDS] = {
1743 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1744 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1745 EMSGSIZE, EHOSTUNREACH, 0, 0,
1746 0, 0, EHOSTUNREACH, 0,
1747 ENOPROTOOPT, ECONNREFUSED