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>
67 #include "opt_inet6.h"
68 #include "opt_ipsec.h"
69 #include "opt_route.h"
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/hhook.h>
76 #include <sys/malloc.h>
79 #include <sys/domain.h>
80 #include <sys/protosw.h>
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
84 #include <sys/errno.h>
86 #include <sys/kernel.h>
88 #include <sys/rmlock.h>
89 #include <sys/syslog.h>
90 #include <sys/sysctl.h>
91 #include <sys/eventhandler.h>
94 #include <net/if_var.h>
95 #include <net/if_types.h>
96 #include <net/if_private.h>
97 #include <net/if_dl.h>
98 #include <net/route.h>
99 #include <net/netisr.h>
100 #include <net/rss_config.h>
101 #include <net/pfil.h>
102 #include <net/vnet.h>
104 #include <netinet/in.h>
105 #include <netinet/in_kdtrace.h>
106 #include <netinet/ip_var.h>
107 #include <netinet/in_systm.h>
108 #include <net/if_llatbl.h>
110 #include <netinet/ip.h>
111 #include <netinet/ip_icmp.h>
113 #include <netinet/ip6.h>
114 #include <netinet6/in6_var.h>
115 #include <netinet6/ip6_var.h>
116 #include <netinet/ip_encap.h>
117 #include <netinet/in_pcb.h>
118 #include <netinet/icmp6.h>
119 #include <netinet6/scope6_var.h>
120 #include <netinet6/in6_ifattach.h>
121 #include <netinet6/mld6_var.h>
122 #include <netinet6/nd6.h>
123 #include <netinet6/in6_rss.h>
125 #include <netinet/sctp_pcb.h>
126 #include <netinet6/sctp6_var.h>
129 #include <netipsec/ipsec_support.h>
131 ip6proto_input_t *ip6_protox[IPPROTO_MAX] = {
132 [0 ... IPPROTO_MAX - 1] = rip6_input };
133 ip6proto_ctlinput_t *ip6_ctlprotox[IPPROTO_MAX] = {
134 [0 ... IPPROTO_MAX - 1] = rip6_ctlinput };
136 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
137 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl);
138 VNET_DEFINE(u_long, in6_ifaddrhmask);
140 static struct netisr_handler ip6_nh = {
142 .nh_handler = ip6_input,
143 .nh_proto = NETISR_IPV6,
145 .nh_m2cpuid = rss_soft_m2cpuid_v6,
146 .nh_policy = NETISR_POLICY_CPU,
147 .nh_dispatch = NETISR_DISPATCH_HYBRID,
149 .nh_policy = NETISR_POLICY_FLOW,
154 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
158 netisr_getqlimit(&ip6_nh, &qlimit);
159 error = sysctl_handle_int(oidp, &qlimit, 0, req);
160 if (error || !req->newptr)
164 return (netisr_setqlimit(&ip6_nh, qlimit));
166 SYSCTL_DECL(_net_inet6_ip6);
167 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen,
168 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
169 0, 0, sysctl_netinet6_intr_queue_maxlen, "I",
170 "Maximum size of the IPv6 input queue");
172 VNET_DEFINE_STATIC(bool, ip6_sav) = true;
173 #define V_ip6_sav VNET(ip6_sav)
174 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, source_address_validation,
175 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sav), true,
176 "Drop incoming packets with source address that is a local address");
179 static struct netisr_handler ip6_direct_nh = {
180 .nh_name = "ip6_direct",
181 .nh_handler = ip6_direct_input,
182 .nh_proto = NETISR_IPV6_DIRECT,
183 .nh_m2cpuid = rss_soft_m2cpuid_v6,
184 .nh_policy = NETISR_POLICY_CPU,
185 .nh_dispatch = NETISR_DISPATCH_HYBRID,
189 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
193 netisr_getqlimit(&ip6_direct_nh, &qlimit);
194 error = sysctl_handle_int(oidp, &qlimit, 0, req);
195 if (error || !req->newptr)
199 return (netisr_setqlimit(&ip6_direct_nh, qlimit));
201 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
202 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
203 0, 0, sysctl_netinet6_intr_direct_queue_maxlen, "I",
204 "Maximum size of the IPv6 direct input queue");
208 VNET_DEFINE(pfil_head_t, inet6_pfil_head);
209 VNET_DEFINE(pfil_head_t, inet6_local_pfil_head);
211 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
212 VNET_PCPUSTAT_SYSINIT(ip6stat);
214 VNET_PCPUSTAT_SYSUNINIT(ip6stat);
217 struct rmlock in6_ifaddr_lock;
218 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
220 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
223 * IP6 initialization: fill in IP6 protocol switch table.
224 * All protocols not implemented in kernel go to raw IP6 protocol handler.
227 ip6_vnet_init(void *arg __unused)
229 struct pfil_head_args args;
231 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
232 &V_ip6_auto_linklocal);
233 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
234 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
236 CK_STAILQ_INIT(&V_in6_ifaddrhead);
237 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
240 /* Initialize packet filter hooks. */
241 args.pa_version = PFIL_VERSION;
242 args.pa_flags = PFIL_IN | PFIL_OUT;
243 args.pa_type = PFIL_TYPE_IP6;
244 args.pa_headname = PFIL_INET6_NAME;
245 V_inet6_pfil_head = pfil_head_register(&args);
247 args.pa_flags = PFIL_OUT;
248 args.pa_headname = PFIL_INET6_LOCAL_NAME;
249 V_inet6_local_pfil_head = pfil_head_register(&args);
251 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6,
252 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6],
253 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
254 printf("%s: WARNING: unable to register input helper hook\n",
256 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6,
257 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6],
258 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
259 printf("%s: WARNING: unable to register output helper hook\n",
263 addrsel_policy_init();
267 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
269 /* Skip global initialization stuff for non-default instances. */
271 netisr_register_vnet(&ip6_nh);
273 netisr_register_vnet(&ip6_direct_nh);
277 VNET_SYSINIT(ip6_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
278 ip6_vnet_init, NULL);
281 ip6_init(void *arg __unused)
285 * Register statically those protocols that are unlikely to ever go
288 IP6PROTO_REGISTER(IPPROTO_ICMPV6, icmp6_input, rip6_ctlinput);
289 IP6PROTO_REGISTER(IPPROTO_DSTOPTS, dest6_input, NULL);
290 IP6PROTO_REGISTER(IPPROTO_ROUTING, route6_input, NULL);
291 IP6PROTO_REGISTER(IPPROTO_FRAGMENT, frag6_input, NULL);
292 IP6PROTO_REGISTER(IPPROTO_IPV4, encap6_input, NULL);
293 IP6PROTO_REGISTER(IPPROTO_IPV6, encap6_input, NULL);
294 IP6PROTO_REGISTER(IPPROTO_ETHERIP, encap6_input, NULL);
295 IP6PROTO_REGISTER(IPPROTO_GRE, encap6_input, NULL);
296 IP6PROTO_REGISTER(IPPROTO_PIM, encap6_input, NULL);
297 #ifdef SCTP /* XXX: has a loadable & static version */
298 IP6PROTO_REGISTER(IPPROTO_SCTP, sctp6_input, sctp6_ctlinput);
301 EVENTHANDLER_REGISTER(vm_lowmem, frag6_drain, NULL, LOWMEM_PRI_DEFAULT);
302 EVENTHANDLER_REGISTER(mbuf_lowmem, frag6_drain, NULL,
305 netisr_register(&ip6_nh);
307 netisr_register(&ip6_direct_nh);
310 SYSINIT(ip6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init, NULL);
313 ip6proto_register(uint8_t proto, ip6proto_input_t input,
314 ip6proto_ctlinput_t ctl)
319 if (ip6_protox[proto] == rip6_input) {
320 ip6_protox[proto] = input;
321 ip6_ctlprotox[proto] = ctl;
328 ip6proto_unregister(uint8_t proto)
333 if (ip6_protox[proto] != rip6_input) {
334 ip6_protox[proto] = rip6_input;
335 ip6_ctlprotox[proto] = rip6_ctlinput;
343 ip6_destroy(void *unused __unused)
345 struct ifaddr *ifa, *nifa;
350 netisr_unregister_vnet(&ip6_direct_nh);
352 netisr_unregister_vnet(&ip6_nh);
354 pfil_head_unregister(V_inet6_pfil_head);
355 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]);
357 printf("%s: WARNING: unable to deregister input helper hook "
358 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: "
359 "error %d returned\n", __func__, error);
361 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]);
363 printf("%s: WARNING: unable to deregister output helper hook "
364 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: "
365 "error %d returned\n", __func__, error);
368 /* Cleanup addresses. */
370 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
371 /* Cannot lock here - lock recursion. */
372 /* IF_ADDR_LOCK(ifp); */
373 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
374 if (ifa->ifa_addr->sa_family != AF_INET6)
378 /* IF_ADDR_UNLOCK(ifp); */
379 in6_ifdetach_destroy(ifp);
380 mld_domifdetach(ifp);
384 /* Make sure any routes are gone as well. */
385 rib_flush_routes_family(AF_INET6);
389 in6_ifattach_destroy();
391 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
394 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL);
398 ip6_input_hbh(struct mbuf **mp, uint32_t *plen, uint32_t *rtalert, int *off,
405 if (ip6_hopopts_input(plen, rtalert, mp, off)) {
406 #if 0 /*touches NULL pointer*/
407 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard);
409 goto out; /* m have already been freed */
414 ip6 = mtod(m, struct ip6_hdr *);
417 * if the payload length field is 0 and the next header field
418 * indicates Hop-by-Hop Options header, then a Jumbo Payload
419 * option MUST be included.
421 if (ip6->ip6_plen == 0 && *plen == 0) {
423 * Note that if a valid jumbo payload option is
424 * contained, ip6_hopopts_input() must set a valid
425 * (non-zero) payload length to the variable plen.
427 IP6STAT_INC(ip6s_badoptions);
428 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
429 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
430 icmp6_error(m, ICMP6_PARAM_PROB,
431 ICMP6_PARAMPROB_HEADER,
432 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
435 /* ip6_hopopts_input() ensures that mbuf is contiguous */
436 hbh = (struct ip6_hbh *)(ip6 + 1);
437 *nxt = hbh->ip6h_nxt;
440 * If we are acting as a router and the packet contains a
441 * router alert option, see if we know the option value.
442 * Currently, we only support the option value for MLD, in which
443 * case we should pass the packet to the multicast routing
446 if (*rtalert != ~0) {
448 case IP6OPT_RTALERT_MLD:
449 if (V_ip6_forwarding)
454 * RFC2711 requires unrecognized values must be
469 * IPv6 direct input routine.
471 * This is called when reinjecting completed fragments where
472 * all of the previous checking and book-keeping has been done.
475 ip6_direct_input(struct mbuf *m)
480 struct ip6_direct_ctx *ip6dc;
482 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL);
483 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!"));
485 ip6dc = (struct ip6_direct_ctx *)(mtag + 1);
486 nxt = ip6dc->ip6dc_nxt;
487 off = ip6dc->ip6dc_off;
491 m_tag_delete(m, mtag);
493 while (nxt != IPPROTO_DONE) {
494 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
495 IP6STAT_INC(ip6s_toomanyhdr);
500 * protection against faulty packet - there should be
501 * more sanity checks in header chain processing.
503 if (m->m_pkthdr.len < off) {
504 IP6STAT_INC(ip6s_tooshort);
505 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
509 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
510 if (IPSEC_ENABLED(ipv6)) {
511 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
516 nxt = ip6_protox[nxt](&m, &off, nxt);
525 ip6_input(struct mbuf *m)
527 struct in6_addr odst;
529 struct in6_ifaddr *ia;
532 u_int32_t rtalert = ~0;
533 int off = sizeof(struct ip6_hdr), nest;
538 * Drop the packet if IPv6 operation is disabled on the interface.
540 rcvif = m->m_pkthdr.rcvif;
541 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED))
544 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
546 * should the inner packet be considered authentic?
547 * see comment in ah4_input().
548 * NB: m cannot be NULL when passed to the input routine
551 m->m_flags &= ~M_AUTHIPHDR;
552 m->m_flags &= ~M_AUTHIPDGM;
556 if (m->m_flags & M_FASTFWD_OURS) {
558 * Firewall changed destination to local.
560 ip6 = mtod(m, struct ip6_hdr *);
567 if (m->m_flags & M_EXT) {
569 IP6STAT_INC(ip6s_mext2m);
571 IP6STAT_INC(ip6s_mext1);
574 struct ifnet *ifp = (m->m_flags & M_LOOP) ? V_loif : rcvif;
575 int ifindex = ifp->if_index;
576 if (ifindex >= IP6S_M2MMAX)
578 IP6STAT_INC(ip6s_m2m[ifindex]);
580 IP6STAT_INC(ip6s_m1);
583 in6_ifstat_inc(rcvif, ifs6_in_receive);
584 IP6STAT_INC(ip6s_total);
587 * L2 bridge code and some other code can return mbuf chain
588 * that does not conform to KAME requirement. too bad.
589 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
591 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
594 if (m->m_pkthdr.len > MHLEN)
595 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
597 n = m_gethdr(M_NOWAIT, MT_DATA);
602 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
603 n->m_len = n->m_pkthdr.len;
607 if (m->m_len < sizeof(struct ip6_hdr)) {
608 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
609 IP6STAT_INC(ip6s_toosmall);
610 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
615 ip6 = mtod(m, struct ip6_hdr *);
616 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
617 IP6STAT_INC(ip6s_badvers);
618 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
622 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
623 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6);
626 * Check against address spoofing/corruption.
628 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
629 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
631 * XXX: "badscope" is not very suitable for a multicast source.
633 IP6STAT_INC(ip6s_badscope);
634 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
637 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
638 !(m->m_flags & M_LOOP)) {
640 * In this case, the packet should come from the loopback
641 * interface. However, we cannot just check the if_flags,
642 * because ip6_mloopback() passes the "actual" interface
643 * as the outgoing/incoming interface.
645 IP6STAT_INC(ip6s_badscope);
646 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
649 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
650 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) {
653 * Nodes must not originate a packet to a multicast address
654 * whose scop field contains the reserved value 0; if such
655 * a packet is received, it must be silently dropped.
657 IP6STAT_INC(ip6s_badscope);
658 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
662 * The following check is not documented in specs. A malicious
663 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
664 * and bypass security checks (act as if it was from 127.0.0.1 by using
665 * IPv6 src ::ffff:127.0.0.1). Be cautious.
667 * We have supported IPv6-only kernels for a few years and this issue
668 * has not come up. The world seems to move mostly towards not using
669 * v4mapped on the wire, so it makes sense for us to keep rejecting
672 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
673 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
674 IP6STAT_INC(ip6s_badscope);
675 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
680 * Reject packets with IPv4 compatible addresses (auto tunnel).
682 * The code forbids auto tunnel relay case in RFC1933 (the check is
683 * stronger than RFC1933). We may want to re-enable it if mech-xx
684 * is revised to forbid relaying case.
686 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
687 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
688 IP6STAT_INC(ip6s_badscope);
689 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
694 * Try to forward the packet, but if we fail continue.
695 * ip6_tryforward() does not generate redirects, so fall
696 * through to normal processing if redirects are required.
697 * ip6_tryforward() does inbound and outbound packet firewall
698 * processing. If firewall has decided that destination becomes
699 * our local address, it sets M_FASTFWD_OURS flag. In this
700 * case skip another inbound firewall processing and update
703 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0
704 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
705 && (!IPSEC_ENABLED(ipv6) ||
706 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0)
709 if ((m = ip6_tryforward(m)) == NULL)
711 if (m->m_flags & M_FASTFWD_OURS) {
712 ip6 = mtod(m, struct ip6_hdr *);
716 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
718 * Bypass packet filtering for packets previously handled by IPsec.
720 if (IPSEC_ENABLED(ipv6) &&
721 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0)
725 * Run through list of hooks for input packets.
727 * NB: Beware of the destination address changing
728 * (e.g. by NAT rewriting). When this happens,
729 * tell ip6_forward to do the right thing.
732 /* Jump over all PFIL processing if hooks are not active. */
733 if (!PFIL_HOOKED_IN(V_inet6_pfil_head))
737 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif,
740 ip6 = mtod(m, struct ip6_hdr *);
741 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
742 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP &&
743 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
745 * Directly ship the packet on. This allows forwarding
746 * packets originally destined to us to some other directly
755 * Disambiguate address scope zones (if there is ambiguity).
756 * We first make sure that the original source or destination address
757 * is not in our internal form for scoped addresses. Such addresses
758 * are not necessarily invalid spec-wise, but we cannot accept them due
759 * to the usage conflict.
760 * in6_setscope() then also checks and rejects the cases where src or
761 * dst are the loopback address and the receiving interface
764 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
765 IP6STAT_INC(ip6s_badscope); /* XXX */
768 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
769 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
770 IP6STAT_INC(ip6s_badscope);
773 if (m->m_flags & M_FASTFWD_OURS) {
774 m->m_flags &= ~M_FASTFWD_OURS;
779 * Multicast check. Assume packet is for us to avoid
780 * prematurely taking locks.
782 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
784 in6_ifstat_inc(rcvif, ifs6_in_mcast);
789 * XXX: For now we keep link-local IPv6 addresses with embedded
790 * scope zone id, therefore we use zero zoneid here.
792 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
794 if (ia->ia6_flags & IN6_IFF_NOTREADY) {
795 char ip6bufs[INET6_ADDRSTRLEN];
796 char ip6bufd[INET6_ADDRSTRLEN];
797 /* address is not ready, so discard the packet. */
799 "ip6_input: packet to an unready address %s->%s\n",
800 ip6_sprintf(ip6bufs, &ip6->ip6_src),
801 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
804 if (V_ip6_sav && !(m->m_flags & M_LOOP) &&
805 __predict_false(in6_localip_fib(&ip6->ip6_src,
807 IP6STAT_INC(ip6s_badscope); /* XXX */
810 /* Count the packet in the ip address stats */
811 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
812 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);
818 * Now there is no reason to process the packet if it's not our own
819 * and we're not a router.
821 if (!V_ip6_forwarding) {
822 IP6STAT_INC(ip6s_cantforward);
828 * Process Hop-by-Hop options header if it's contained.
829 * m may be modified in ip6_hopopts_input().
830 * If a JumboPayload option is included, plen will also be modified.
832 plen = (u_int32_t)ntohs(ip6->ip6_plen);
833 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
834 if (ip6_input_hbh(&m, &plen, &rtalert, &off, &nxt, &ours) != 0)
840 * Use mbuf flags to propagate Router Alert option to
841 * ICMPv6 layer, as hop-by-hop options have been stripped.
844 m->m_flags |= M_RTALERT_MLD;
847 * Check that the amount of data in the buffers
848 * is as at least much as the IPv6 header would have us expect.
849 * Trim mbufs if longer than we expect.
850 * Drop packet if shorter than we expect.
852 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
853 IP6STAT_INC(ip6s_tooshort);
854 in6_ifstat_inc(rcvif, ifs6_in_truncated);
857 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
858 if (m->m_len == m->m_pkthdr.len) {
859 m->m_len = sizeof(struct ip6_hdr) + plen;
860 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
862 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
866 * Forward if desirable.
869 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
871 * If we are acting as a multicast router, all
872 * incoming multicast packets are passed to the
873 * kernel-level multicast forwarding function.
874 * The packet is returned (relatively) intact; if
875 * ip6_mforward() returns a non-zero value, the packet
876 * must be discarded, else it may be accepted below.
878 * XXX TODO: Check hlim and multicast scope here to avoid
879 * unnecessarily calling into ip6_mforward().
881 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) {
882 IP6STAT_INC(ip6s_cantforward);
886 ip6_forward(m, srcrt);
891 * We are going to ship the packet to the local protocol stack. Call the
892 * filter again for this 'output' action, allowing redirect-like rules
893 * to adjust the source address.
895 if (PFIL_HOOKED_OUT(V_inet6_local_pfil_head)) {
896 if (pfil_mbuf_out(V_inet6_local_pfil_head, &m, V_loif, NULL) !=
899 if (m == NULL) /* consumed by filter */
901 ip6 = mtod(m, struct ip6_hdr *);
905 * Tell launch routine the next header
907 IP6STAT_INC(ip6s_delivered);
908 in6_ifstat_inc(rcvif, ifs6_in_deliver);
911 while (nxt != IPPROTO_DONE) {
912 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
913 IP6STAT_INC(ip6s_toomanyhdr);
918 * protection against faulty packet - there should be
919 * more sanity checks in header chain processing.
921 if (m->m_pkthdr.len < off) {
922 IP6STAT_INC(ip6s_tooshort);
923 in6_ifstat_inc(rcvif, ifs6_in_truncated);
927 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
928 if (IPSEC_ENABLED(ipv6)) {
929 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
934 nxt = ip6_protox[nxt](&m, &off, nxt);
938 in6_ifstat_inc(rcvif, ifs6_in_discard);
944 * Hop-by-Hop options header processing. If a valid jumbo payload option is
945 * included, the real payload length will be stored in plenp.
947 * rtalertp - XXX: should be stored more smart way
950 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
951 struct mbuf **mp, int *offp)
953 struct mbuf *m = *mp;
954 int off = *offp, hbhlen;
957 /* validation of the length of the header */
958 if (m->m_len < off + sizeof(*hbh)) {
959 m = m_pullup(m, off + sizeof(*hbh));
961 IP6STAT_INC(ip6s_exthdrtoolong);
966 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
967 hbhlen = (hbh->ip6h_len + 1) << 3;
969 if (m->m_len < off + hbhlen) {
970 m = m_pullup(m, off + hbhlen);
972 IP6STAT_INC(ip6s_exthdrtoolong);
977 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
979 hbhlen -= sizeof(struct ip6_hbh);
980 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
981 hbhlen, rtalertp, plenp) < 0) {
992 * Search header for all Hop-by-hop options and process each option.
993 * This function is separate from ip6_hopopts_input() in order to
994 * handle a case where the sending node itself process its hop-by-hop
995 * options header. In such a case, the function is called from ip6_output().
997 * The function assumes that hbh header is located right after the IPv6 header
998 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
999 * opthead + hbhlen is located in contiguous memory region.
1002 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1003 u_int32_t *rtalertp, u_int32_t *plenp)
1005 struct ip6_hdr *ip6;
1007 u_int8_t *opt = opthead;
1008 u_int16_t rtalert_val;
1009 u_int32_t jumboplen;
1010 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1012 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1018 if (hbhlen < IP6OPT_MINLEN) {
1019 IP6STAT_INC(ip6s_toosmall);
1022 optlen = *(opt + 1) + 2;
1024 case IP6OPT_ROUTER_ALERT:
1025 /* XXX may need check for alignment */
1026 if (hbhlen < IP6OPT_RTALERT_LEN) {
1027 IP6STAT_INC(ip6s_toosmall);
1030 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1032 icmp6_error(m, ICMP6_PARAM_PROB,
1033 ICMP6_PARAMPROB_HEADER,
1034 erroff + opt + 1 - opthead);
1037 optlen = IP6OPT_RTALERT_LEN;
1038 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1039 *rtalertp = ntohs(rtalert_val);
1042 /* XXX may need check for alignment */
1043 if (hbhlen < IP6OPT_JUMBO_LEN) {
1044 IP6STAT_INC(ip6s_toosmall);
1047 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1049 icmp6_error(m, ICMP6_PARAM_PROB,
1050 ICMP6_PARAMPROB_HEADER,
1051 erroff + opt + 1 - opthead);
1054 optlen = IP6OPT_JUMBO_LEN;
1057 * IPv6 packets that have non 0 payload length
1058 * must not contain a jumbo payload option.
1060 ip6 = mtod(m, struct ip6_hdr *);
1061 if (ip6->ip6_plen) {
1062 IP6STAT_INC(ip6s_badoptions);
1063 icmp6_error(m, ICMP6_PARAM_PROB,
1064 ICMP6_PARAMPROB_HEADER,
1065 erroff + opt - opthead);
1070 * We may see jumbolen in unaligned location, so
1071 * we'd need to perform bcopy().
1073 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1074 jumboplen = (u_int32_t)htonl(jumboplen);
1078 * if there are multiple jumbo payload options,
1079 * *plenp will be non-zero and the packet will be
1081 * the behavior may need some debate in ipngwg -
1082 * multiple options does not make sense, however,
1083 * there's no explicit mention in specification.
1086 IP6STAT_INC(ip6s_badoptions);
1087 icmp6_error(m, ICMP6_PARAM_PROB,
1088 ICMP6_PARAMPROB_HEADER,
1089 erroff + opt + 2 - opthead);
1095 * jumbo payload length must be larger than 65535.
1097 if (jumboplen <= IPV6_MAXPACKET) {
1098 IP6STAT_INC(ip6s_badoptions);
1099 icmp6_error(m, ICMP6_PARAM_PROB,
1100 ICMP6_PARAMPROB_HEADER,
1101 erroff + opt + 2 - opthead);
1107 default: /* unknown option */
1108 if (hbhlen < IP6OPT_MINLEN) {
1109 IP6STAT_INC(ip6s_toosmall);
1112 optlen = ip6_unknown_opt(opt, m,
1113 erroff + opt - opthead);
1129 * Unknown option processing.
1130 * The third argument `off' is the offset from the IPv6 header to the option,
1131 * which is necessary if the IPv6 header the and option header and IPv6 header
1132 * is not contiguous in order to return an ICMPv6 error.
1135 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1137 struct ip6_hdr *ip6;
1139 switch (IP6OPT_TYPE(*optp)) {
1140 case IP6OPT_TYPE_SKIP: /* ignore the option */
1141 return ((int)*(optp + 1));
1142 case IP6OPT_TYPE_DISCARD: /* silently discard */
1145 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1146 IP6STAT_INC(ip6s_badoptions);
1147 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1149 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1150 IP6STAT_INC(ip6s_badoptions);
1151 ip6 = mtod(m, struct ip6_hdr *);
1152 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1153 (m->m_flags & (M_BCAST|M_MCAST)))
1156 icmp6_error(m, ICMP6_PARAM_PROB,
1157 ICMP6_PARAMPROB_OPTION, off);
1161 m_freem(m); /* XXX: NOTREACHED */
1166 * Create the "control" list for this pcb.
1167 * These functions will not modify mbuf chain at all.
1169 * The routine will be called from upper layer handlers like tcp6_input().
1170 * Thus the routine assumes that the caller (tcp6_input) have already
1171 * called m_pullup() and all the extension headers are located in the
1172 * very first mbuf on the mbuf chain.
1174 * ip6_savecontrol_v4 will handle those options that are possible to be
1175 * set on a v4-mapped socket.
1176 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1177 * options and handle the v6-only ones itself.
1180 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1183 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1186 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1192 struct bintime boottimebin, bt1;
1193 struct timespec ts1;
1197 switch (inp->inp_socket->so_ts_clock) {
1198 case SO_TS_REALTIME_MICRO:
1199 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1201 mbuf_tstmp2timespec(m, &ts1);
1202 timespec2bintime(&ts1, &bt1);
1203 getboottimebin(&boottimebin);
1204 bintime_add(&bt1, &boottimebin);
1205 bintime2timeval(&bt1, &t.tv);
1209 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv),
1210 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT);
1212 mp = &(*mp)->m_next;
1218 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1220 mbuf_tstmp2timespec(m, &ts1);
1221 timespec2bintime(&ts1, &t.bt);
1222 getboottimebin(&boottimebin);
1223 bintime_add(&t.bt, &boottimebin);
1227 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME,
1228 SOL_SOCKET, M_NOWAIT);
1230 mp = &(*mp)->m_next;
1235 case SO_TS_REALTIME:
1236 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1238 mbuf_tstmp2timespec(m, &t.ts);
1239 getboottimebin(&boottimebin);
1240 bintime2timespec(&boottimebin, &ts1);
1241 timespecadd(&t.ts, &ts1, &t.ts);
1245 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts),
1246 SCM_REALTIME, SOL_SOCKET, M_NOWAIT);
1248 mp = &(*mp)->m_next;
1253 case SO_TS_MONOTONIC:
1254 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1256 mbuf_tstmp2timespec(m, &t.ts);
1259 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts),
1260 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT);
1262 mp = &(*mp)->m_next;
1268 panic("unknown (corrupted) so_ts_clock");
1270 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) ==
1271 (M_PKTHDR | M_TSTMP)) {
1272 struct sock_timestamp_info sti;
1274 bzero(&sti, sizeof(sti));
1275 sti.st_info_flags = ST_INFO_HW;
1276 if ((m->m_flags & M_TSTMP_HPREC) != 0)
1277 sti.st_info_flags |= ST_INFO_HW_HPREC;
1278 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO,
1279 SOL_SOCKET, M_NOWAIT);
1281 mp = &(*mp)->m_next;
1286 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1287 /* RFC 2292 sec. 5 */
1288 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1289 struct in6_pktinfo pi6;
1291 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1295 ip = mtod(m, struct ip *);
1296 pi6.ipi6_addr.s6_addr32[0] = 0;
1297 pi6.ipi6_addr.s6_addr32[1] = 0;
1298 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1299 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1301 /* We won't hit this code */
1302 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1305 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1306 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1309 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1311 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo),
1312 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6,
1315 mp = &(*mp)->m_next;
1318 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1321 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1325 ip = mtod(m, struct ip *);
1328 /* We won't hit this code */
1332 hlim = ip6->ip6_hlim & 0xff;
1334 *mp = sbcreatecontrol(&hlim, sizeof(int),
1335 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1336 IPPROTO_IPV6, M_NOWAIT);
1338 mp = &(*mp)->m_next;
1341 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1344 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1348 ip = mtod(m, struct ip *);
1349 tclass = ip->ip_tos;
1351 /* We won't hit this code */
1357 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1359 tclass = flowinfo & 0xff;
1361 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS,
1362 IPPROTO_IPV6, M_NOWAIT);
1364 mp = &(*mp)->m_next;
1367 if (v4only != NULL) {
1368 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1379 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp)
1381 struct ip6_hdr *ip6;
1384 mp = ip6_savecontrol_v4(inp, m, mp, &v4only);
1388 ip6 = mtod(m, struct ip6_hdr *);
1390 * IPV6_HOPOPTS socket option. Recall that we required super-user
1391 * privilege for the option (see ip6_ctloutput), but it might be too
1392 * strict, since there might be some hop-by-hop options which can be
1393 * returned to normal user.
1394 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1396 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) {
1398 * Check if a hop-by-hop options header is contatined in the
1399 * received packet, and if so, store the options as ancillary
1400 * data. Note that a hop-by-hop options header must be
1401 * just after the IPv6 header, which is assured through the
1402 * IPv6 input processing.
1404 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1405 struct ip6_hbh *hbh;
1408 hbh = (struct ip6_hbh *)(ip6 + 1);
1409 hbhlen = (hbh->ip6h_len + 1) << 3;
1412 * XXX: We copy the whole header even if a
1413 * jumbo payload option is included, the option which
1414 * is to be removed before returning according to
1416 * Note: this constraint is removed in RFC3542
1418 *mp = sbcreatecontrol(hbh, hbhlen,
1419 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1420 IPPROTO_IPV6, M_NOWAIT);
1422 mp = &(*mp)->m_next;
1426 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1427 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1430 * Search for destination options headers or routing
1431 * header(s) through the header chain, and stores each
1432 * header as ancillary data.
1433 * Note that the order of the headers remains in
1434 * the chain of ancillary data.
1436 while (1) { /* is explicit loop prevention necessary? */
1437 struct ip6_ext *ip6e = NULL;
1441 * if it is not an extension header, don't try to
1442 * pull it from the chain.
1445 case IPPROTO_DSTOPTS:
1446 case IPPROTO_ROUTING:
1447 case IPPROTO_HOPOPTS:
1448 case IPPROTO_AH: /* is it possible? */
1454 if (off + sizeof(*ip6e) > m->m_len)
1456 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1457 if (nxt == IPPROTO_AH)
1458 elen = (ip6e->ip6e_len + 2) << 2;
1460 elen = (ip6e->ip6e_len + 1) << 3;
1461 if (off + elen > m->m_len)
1465 case IPPROTO_DSTOPTS:
1466 if (!(inp->inp_flags & IN6P_DSTOPTS))
1469 *mp = sbcreatecontrol(ip6e, elen,
1470 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1471 IPPROTO_IPV6, M_NOWAIT);
1473 mp = &(*mp)->m_next;
1475 case IPPROTO_ROUTING:
1476 if (!(inp->inp_flags & IN6P_RTHDR))
1479 *mp = sbcreatecontrol(ip6e, elen,
1480 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR),
1481 IPPROTO_IPV6, M_NOWAIT);
1483 mp = &(*mp)->m_next;
1485 case IPPROTO_HOPOPTS:
1486 case IPPROTO_AH: /* is it possible? */
1491 * other cases have been filtered in the above.
1492 * none will visit this case. here we supply
1493 * the code just in case (nxt overwritten or
1499 /* proceed with the next header. */
1501 nxt = ip6e->ip6e_nxt;
1508 if (inp->inp_flags2 & INP_RECVFLOWID) {
1509 uint32_t flowid, flow_type;
1511 flowid = m->m_pkthdr.flowid;
1512 flow_type = M_HASHTYPE_GET(m);
1515 * XXX should handle the failure of one or the
1516 * other - don't populate both?
1518 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID,
1519 IPPROTO_IPV6, M_NOWAIT);
1521 mp = &(*mp)->m_next;
1522 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t),
1523 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT);
1525 mp = &(*mp)->m_next;
1529 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) {
1530 uint32_t flowid, flow_type;
1531 uint32_t rss_bucketid;
1533 flowid = m->m_pkthdr.flowid;
1534 flow_type = M_HASHTYPE_GET(m);
1536 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
1537 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t),
1538 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT);
1540 mp = &(*mp)->m_next;
1549 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu)
1553 struct ip6_mtuinfo mtuctl;
1555 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1557 * Notify the error by sending IPV6_PATHMTU ancillary data if
1558 * application wanted to know the MTU value.
1559 * NOTE: we notify disconnected sockets, because some udp
1560 * applications keep sending sockets disconnected.
1561 * NOTE: our implementation doesn't notify connected sockets that has
1562 * foreign address that is different than given destination addresses
1563 * (this is permitted by RFC 3542).
1565 if ((inp->inp_flags & IN6P_MTU) == 0 || (
1566 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1567 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr)))
1570 mtuctl.ip6m_mtu = mtu;
1571 mtuctl.ip6m_addr = *dst;
1572 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1575 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU,
1576 IPPROTO_IPV6, M_NOWAIT)) == NULL)
1579 so = inp->inp_socket;
1580 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1584 /* XXX: should count statistics */
1590 * Get pointer to the previous header followed by the header
1591 * currently processed.
1594 ip6_get_prevhdr(const struct mbuf *m, int off)
1596 struct ip6_ext ip6e;
1597 struct ip6_hdr *ip6;
1600 if (off == sizeof(struct ip6_hdr))
1601 return (offsetof(struct ip6_hdr, ip6_nxt));
1602 if (off < sizeof(struct ip6_hdr))
1603 panic("%s: off < sizeof(struct ip6_hdr)", __func__);
1605 ip6 = mtod(m, struct ip6_hdr *);
1607 len = sizeof(struct ip6_hdr);
1610 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e);
1612 case IPPROTO_FRAGMENT:
1613 nlen = sizeof(struct ip6_frag);
1616 nlen = (ip6e.ip6e_len + 2) << 2;
1619 nlen = (ip6e.ip6e_len + 1) << 3;
1622 nxt = ip6e.ip6e_nxt;
1624 return (len - nlen);
1628 * get next header offset. m will be retained.
1631 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1634 struct ip6_ext ip6e;
1639 panic("ip6_nexthdr: m == NULL");
1640 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1645 if (m->m_pkthdr.len < off + sizeof(ip6))
1647 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1649 *nxtp = ip6.ip6_nxt;
1653 case IPPROTO_FRAGMENT:
1655 * terminate parsing if it is not the first fragment,
1656 * it does not make sense to parse through it.
1658 if (m->m_pkthdr.len < off + sizeof(fh))
1660 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1661 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1662 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1665 *nxtp = fh.ip6f_nxt;
1666 off += sizeof(struct ip6_frag);
1670 if (m->m_pkthdr.len < off + sizeof(ip6e))
1672 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1674 *nxtp = ip6e.ip6e_nxt;
1675 off += (ip6e.ip6e_len + 2) << 2;
1678 case IPPROTO_HOPOPTS:
1679 case IPPROTO_ROUTING:
1680 case IPPROTO_DSTOPTS:
1681 if (m->m_pkthdr.len < off + sizeof(ip6e))
1683 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1685 *nxtp = ip6e.ip6e_nxt;
1686 off += (ip6e.ip6e_len + 1) << 3;
1691 case IPPROTO_IPCOMP:
1703 * get offset for the last header in the chain. m will be kept untainted.
1706 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1716 newoff = ip6_nexthdr(m, off, proto, nxtp);
1719 else if (newoff < off)
1720 return -1; /* invalid */
1721 else if (newoff == off)