new file mode 100644
--- /dev/null
+++ b/packages/net/bsd_tcpip/current/src/sys/netinet6/ip6_input.c
@@ -0,0 +1,2514 @@
+//==========================================================================
+//
+//      src/sys/netinet6/ip6_input.c
+//
+//==========================================================================
+//####BSDCOPYRIGHTBEGIN####
+//
+// -------------------------------------------
+//
+// Portions of this software may have been derived from OpenBSD, 
+// FreeBSD or other sources, and are covered by the appropriate
+// copyright disclaimers included herein.
+//
+// Portions created by Red Hat are
+// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+//
+// -------------------------------------------
+//
+//####BSDCOPYRIGHTEND####
+//==========================================================================
+
+/*	$KAME: ip6_input.c,v 1.242 2001/12/27 17:40:10 jinmei Exp $	*/
+
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 1982, 1986, 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)ip_input.c	8.2 (Berkeley) 1/4/94
+ */
+
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/domain.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/errno.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/if_dl.h>
+#include <net/route.h>
+#include <net/netisr.h>
+#if defined(__FreeBSD__) && __FreeBSD__ >= 4
+#include <net/intrq.h>
+#endif
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#ifdef INET
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+#endif /* INET */
+#include <netinet/ip6.h>
+#include <netinet6/in6_var.h>
+#include <netinet6/ip6_var.h>
+#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802)
+#include <netinet/in_pcb.h>
+#endif
+#if !((defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802))
+#include <netinet6/in6_pcb.h>
+#endif
+#include <netinet/icmp6.h>
+#include <netinet6/in6_ifattach.h>
+#include <netinet6/nd6.h>
+#ifdef __bsdi__
+#include <netinet6/raw_ip6.h>
+#endif
+#ifdef MIP6
+#include <netinet6/mip6.h>
+#endif
+
+#if defined(IPSEC) && !defined(__OpenBSD__)
+#include <netinet6/ipsec.h>
+#endif
+
+#if defined(IPV6FIREWALL) || (defined(__FreeBSD__) && __FreeBSD__ >= 4)
+#include <netinet6/ip6_fw.h>
+#endif
+
+#include <netinet6/ip6protosw.h>
+
+/* we need it for NLOOP. */
+
+#if NGIF > 0
+#include <netinet6/in6_gif.h>
+#endif
+
+#ifdef MIP6
+#include <netinet6/mip6.h>
+#endif /* MIP6 */
+
+#ifdef __OpenBSD__
+#if NPF > 0
+#include <net/pfvar.h>
+#endif
+#endif
+
+extern struct domain inet6domain;
+extern struct ip6protosw inet6sw[];
+#ifdef __bsdi__
+#if _BSDI_VERSION < 199802
+extern struct ifnet loif;
+#else
+extern struct ifnet *loifp;
+#endif
+#endif
+
+u_char ip6_protox[IPPROTO_MAX];
+static int ip6qmaxlen = IFQ_MAXLEN;
+struct in6_ifaddr *in6_ifaddr;
+#if !(defined(__FreeBSD__) && __FreeBSD__ >= 4)
+struct ifqueue ip6intrq;
+#endif
+
+#if defined(__NetBSD__)
+extern struct ifnet loif[NLOOP];
+#endif
+#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
+extern struct callout in6_tmpaddrtimer_ch;
+#elif defined(__OpenBSD__)
+extern struct timeout in6_tmpaddrtimer_ch;
+#endif
+
+int ip6_forward_srcrt;			/* XXX */
+int ip6_sourcecheck;			/* XXX */
+int ip6_sourcecheck_interval;		/* XXX */
+#if defined(__FreeBSD__) && __FreeBSD__ >= 4
+const int int6intrq_present = 1;
+#endif
+
+#ifdef MEASURE_PERFORMANCE
+#define MEASURE_PERFORMANCE_UDPONLY
+#define IP6_PERFORM_LOGSIZE 10000
+int ip6_logentry;
+int ip6_logsize = IP6_PERFORM_LOGSIZE;
+unsigned long long ip6_performance_log[IP6_PERFORM_LOGSIZE];
+unsigned long long ip6_performance_log2[IP6_PERFORM_LOGSIZE];
+struct in6_addr ip6_performance_addrlog[IP6_PERFORM_LOGSIZE];
+#endif
+#ifdef MEASURE_PERFORMANCE
+#define OURS_CHECK_ALG_RTABLE 0
+#define OURS_CHECK_ALG_LINEAR 1
+#define OURS_CHECK_ALG_HASH 2
+#define OURS_CHECK_ALG_LARGEHASH 3
+#ifdef OURS_CHECK_LINEAR
+int ip6_ours_check_algorithm = OURS_CHECK_ALG_LINEAR;
+#elif OURS_CHECK_HASH
+int ip6_ours_check_algorithm = OURS_CHECK_ALG_HASH;
+#else
+int ip6_ours_check_algorithm = OURS_CHECK_ALG_RTABLE;
+#endif
+#else
+int ip6_ours_check_algorithm;
+#endif
+
+
+#if defined(IPV6FIREWALL) || (defined(__FreeBSD__) && __FreeBSD__ >= 4)
+/* firewall hooks */
+ip6_fw_chk_t *ip6_fw_chk_ptr;
+ip6_fw_ctl_t *ip6_fw_ctl_ptr;
+#endif
+#if defined(__FreeBSD__) && __FreeBSD__ >= 4
+int ip6_fw_enable = 1;
+#endif
+
+struct ip6stat ip6stat;
+
+static void ip6_init2 __P((void *));
+static struct mbuf *ip6_setdstifaddr __P((struct mbuf *, struct in6_ifaddr *));
+
+static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
+#ifdef PULLDOWN_TEST
+static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int));
+#endif
+
+#ifdef NATPT
+extern int ip6_protocol_tr;
+
+int natpt_in6 __P((struct mbuf *, struct mbuf **));
+extern void ip_forward __P((struct mbuf *, int));
+#endif
+
+
+#ifdef MEASURE_PERFORMANCE
+static unsigned long long ctr_beg, ctr_end;
+
+static __inline unsigned long long read_tsc __P((void));
+static __inline void add_performance_log __P((unsigned long long,
+					      struct in6_addr *)); 
+#endif
+
+#ifdef MEASURE_PERFORMANCE
+static __inline unsigned long long 
+read_tsc(void)
+{
+     unsigned int h,l;
+     /* read Pentium counter */
+     __asm__(".byte 0x0f,0x31" :"=a" (l), "=d" (h));
+     return ((unsigned long long)h<<32) | l;
+}
+
+static __inline void
+add_performance_log(val, addr)
+	unsigned long long val;
+	struct in6_addr *addr;
+{
+	ip6_logentry = (ip6_logentry + 1) % ip6_logsize;
+	ip6_performance_log[ip6_logentry] = val;
+	ip6_performance_addrlog[ip6_logentry] = *addr;
+}
+#endif
+
+/*
+ * IP6 initialization: fill in IP6 protocol switch table.
+ * All protocols not implemented in kernel go to raw IP6 protocol handler.
+ */
+void
+ip6_init()
+{
+	struct ip6protosw *pr;
+	int i;
+#ifndef __OpenBSD__
+	struct timeval tv;
+#endif
+
+#ifdef RADIX_ART
+	rt_tables[AF_INET6]->rnh_addrsize = sizeof(struct in6_addr);
+#endif
+
+#ifdef DIAGNOSTIC
+	if (sizeof(struct protosw) != sizeof(struct ip6protosw))
+		panic("sizeof(protosw) != sizeof(ip6protosw)");
+#endif
+	pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
+	if (pr == 0)
+		panic("ip6_init");
+	for (i = 0; i < IPPROTO_MAX; i++)
+		ip6_protox[i] = pr - inet6sw;
+	for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
+	    pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
+		if (pr->pr_domain->dom_family == PF_INET6 &&
+		    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
+			ip6_protox[pr->pr_protocol] = pr - inet6sw;
+	ip6intrq.ifq_maxlen = ip6qmaxlen;
+#if (defined(__FreeBSD__) && __FreeBSD__ >= 4)
+	register_netisr(NETISR_IPV6, ip6intr);
+#endif
+	addrsel_policy_init();
+	nd6_init();
+	frag6_init();
+#if defined(__FreeBSD__) && __FreeBSD__ >= 4
+#else
+#ifdef IPV6FIREWALL
+	ip6_fw_init();
+#endif
+#endif
+#ifndef __OpenBSD__
+	/*
+	 * in many cases, random() here does NOT return random number
+	 * as initialization during bootstrap time occur in fixed order.
+	 */
+	microtime(&tv);
+	ip6_flow_seq = random() ^ tv.tv_usec;
+	microtime(&tv);
+	ip6_desync_factor = (random() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR;
+#else
+	ip6_flow_seq = arc4random();
+	ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
+#endif
+
+#ifndef __FreeBSD__
+	ip6_init2((void *)0);
+#endif
+
+#ifdef MIP6
+	mip6_init();
+#endif /* MIP6 */
+
+#ifdef MEASURE_PERFORMANCE
+	in6h_hashinit();
+#endif
+}
+
+static void
+ip6_init2(dummy)
+	void *dummy;
+{
+#if defined(__bsdi__) && _BSDI_VERSION < 199802
+	struct ifnet *loifp = &loif;
+#endif
+
+	/*
+	 * to route local address of p2p link to loopback,
+	 * assign loopback address first.
+	 */
+#ifdef __bsdi__
+	in6_ifattach(loifp, NULL);
+#elif defined(__OpenBSD__)
+	in6_ifattach(lo0ifp, NULL);
+#else
+	in6_ifattach(&loif[0], NULL);
+#endif
+
+	/* nd6_timer_init */
+#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
+	callout_init(&nd6_timer_ch);
+	callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
+#elif defined(__OpenBSD__)
+	bzero(&nd6_timer_ch, sizeof(nd6_timer_ch));
+	timeout_set(&nd6_timer_ch, nd6_timer, NULL);
+	timeout_add(&nd6_timer_ch, hz);
+#else
+	timeout(nd6_timer, (caddr_t)0, hz);
+#endif
+
+	/* timer for regeneranation of temporary addresses randomize ID */
+#if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3)
+	callout_init(&in6_tmpaddrtimer_ch);
+	callout_reset(&in6_tmpaddrtimer_ch,
+		      (ip6_temp_preferred_lifetime - ip6_desync_factor -
+		       ip6_temp_regen_advance) * hz,
+		      in6_tmpaddrtimer, NULL);
+#elif defined(__OpenBSD__)
+	timeout_set(&in6_tmpaddrtimer_ch, in6_tmpaddrtimer, NULL);
+	timeout_add(&in6_tmpaddrtimer_ch,
+	    (ip6_temp_preferred_lifetime - ip6_desync_factor -
+	    ip6_temp_regen_advance) * hz);
+#else
+	timeout(in6_tmpaddrtimer, (caddr_t)0,
+		(ip6_temp_preferred_lifetime - ip6_desync_factor -
+			ip6_temp_regen_advance) * hz);
+#endif
+}
+
+SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
+
+/*
+ * IP6 input interrupt handling. Just pass the packet to ip6_input.
+ */
+void
+ip6intr()
+{
+	int s;
+	struct mbuf *m;
+
+	for (;;) {
+		s = splimp();
+		IF_DEQUEUE(&ip6intrq, m);
+		splx(s);
+		if (m == 0)
+			return;
+		ip6_input(m);
+	}
+}
+
+#if (defined(__FreeBSD__) && __FreeBSD__ <= 3)
+NETISR_SET(NETISR_IPV6, ip6intr);
+#endif
+
+#ifdef NEW_STRUCT_ROUTE
+extern struct	route ip6_forward_rt;
+#else
+extern struct	route_in6 ip6_forward_rt;
+
+/* NetBSD/OpenBSD requires NEW_STRUCT_ROUTE */
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+#error NEW_STRUCT_ROUTE is required
+#endif
+#endif
+
+void
+ip6_input(m)
+	struct mbuf *m;
+{
+	struct ip6_hdr *ip6;
+	int off = sizeof(struct ip6_hdr), nest;
+	u_int32_t plen;
+	u_int32_t rtalert = ~0;
+	int nxt, ours = 0;
+	struct ifnet *deliverifp = NULL;
+#if 0
+	struct mbuf *mhist;	/* onion peeling history */
+	caddr_t hist;
+#endif
+#if defined(__bsdi__) && _BSDI_VERSION < 199802
+	struct ifnet *loifp = &loif;
+#endif
+#if defined(__NetBSD__) && defined(PFIL_HOOKS)
+	struct packet_filter_hook *pfh;
+	struct mbuf *m0;
+	int rv;
+#endif	/* PFIL_HOOKS */
+
+#if defined(IPSEC) && !defined(__OpenBSD__)
+	/*
+	 * should the inner packet be considered authentic?
+	 * see comment in ah4_input().
+	 */
+	m->m_flags &= ~M_AUTHIPHDR;
+	m->m_flags &= ~M_AUTHIPDGM;
+#endif
+
+	/*
+	 * make sure we don't have onion peering information into m_aux.
+	 */
+	ip6_delaux(m);
+
+	/*
+	 * mbuf statistics
+	 */
+	if (m->m_flags & M_EXT) {
+		if (m->m_next)
+			ip6stat.ip6s_mext2m++;
+		else
+			ip6stat.ip6s_mext1++;
+	} else {
+#define M2MMAX	(sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
+		if (m->m_next) {
+			if (m->m_flags & M_LOOP) {
+#ifdef __bsdi__
+				ip6stat.ip6s_m2m[loifp->if_index]++; /* XXX */
+#elif defined(__OpenBSD__)
+				ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */
+#else
+				ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
+#endif
+			} else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
+				ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
+			else
+				ip6stat.ip6s_m2m[0]++;
+		} else
+			ip6stat.ip6s_m1++;
+#undef M2MMAX
+	}
+
+	in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
+	ip6stat.ip6s_total++;
+
+#ifndef PULLDOWN_TEST
+	/* 
+	 * L2 bridge code and some other code can return mbuf chain
+	 * that does not conform to KAME requirement.  too bad.
+	 * XXX: fails to join if interface MTU > MCLBYTES.  jumbogram?
+	 */
+	if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
+		struct mbuf *n;
+
+		MGETHDR(n, M_DONTWAIT, MT_HEADER);
+		if (n != NULL) {
+#ifdef __OpenBSD__
+			M_MOVE_PKTHDR(n, m);
+#else
+			M_COPY_PKTHDR(n, m);
+#endif
+		}
+		if (n != NULL && m->m_pkthdr.len > MHLEN) {
+			MCLGET(n, M_DONTWAIT);
+			if ((n->m_flags & M_EXT) == 0) {
+				m_freem(n);
+				n = NULL;
+			}
+		}
+		if (n == NULL) {
+			m_freem(m);
+			return;	/* ENOBUFS */
+		}
+
+		m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
+		n->m_len = m->m_pkthdr.len;
+		m_freem(m);
+		m = n;
+	}
+	IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */);
+#endif
+
+#if defined(__OpenBSD__) && NPF > 0 
+	/*
+	 * Packet filter
+	 */
+	if (pf_test6(PF_IN, m->m_pkthdr.rcvif, &m) != PF_PASS)
+		goto bad;
+#endif
+
+	if (m->m_len < sizeof(struct ip6_hdr)) {
+		struct ifnet *inifp;
+		inifp = m->m_pkthdr.rcvif;
+		if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) {
+			ip6stat.ip6s_toosmall++;
+			in6_ifstat_inc(inifp, ifs6_in_hdrerr);
+			return;
+		}
+	}
+
+	ip6 = mtod(m, struct ip6_hdr *);
+
+	if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
+		ip6stat.ip6s_badvers++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
+		goto bad;
+	}
+
+#if defined(__NetBSD__) && defined(PFIL_HOOKS)
+	/*
+	 * Run through list of hooks for input packets.  If there are any
+	 * filters which require that additional packets in the flow are
+	 * not fast-forwarded, they must clear the M_CANFASTFWD flag.
+	 * Note that filters must _never_ set this flag, as another filter
+	 * in the list may have previously cleared it.
+	 */
+	/*
+	 * let ipfilter look at packet on the wire,
+	 * not the decapsulated packet.
+	 */
+#ifdef IPSEC
+	if (!ipsec_getnhist(m))
+#else
+	if (1 /* CONSTCOND */)
+#endif
+	{
+		m0 = m;
+		pfh = pfil_hook_get(PFIL_IN,
+		    &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh);
+	} else
+		pfh = NULL;
+	for (; pfh; pfh = pfh->pfil_link.tqe_next)
+		if (pfh->pfil_func) {
+			rv = pfh->pfil_func(ip6, sizeof(*ip6),
+					    m->m_pkthdr.rcvif, 0, &m0);
+			if (rv)
+				return;
+			m = m0;
+			if (m == NULL)
+				return;
+			ip6 = mtod(m, struct ip6_hdr *);
+		}
+#endif /* PFIL_HOOKS */
+
+	ip6stat.ip6s_nxthist[ip6->ip6_nxt]++;
+
+#if defined(IPV6FIREWALL) || (defined(__FreeBSD__) && __FreeBSD__ >= 4)
+	/*
+	 * Check with the firewall...
+	 */
+#if defined(__FreeBSD__) && __FreeBSD__ >= 4
+	if (ip6_fw_enable && ip6_fw_chk_ptr)
+#else
+	if (ip6_fw_chk_ptr)
+#endif
+	{
+		/* If ipfw says divert, we have to just drop packet */
+		/* use port as a dummy argument */
+		if ((*ip6_fw_chk_ptr)(&ip6, NULL, &m)) {
+			m_freem(m);
+			m = NULL;
+		}
+		if (!m)
+			return;
+	}
+#endif
+
+#ifdef ALTQ
+	if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
+		/* packet is dropped by traffic conditioner */
+		return;
+	}
+#endif
+
+	/*
+	 * Check against address spoofing/corruption.
+	 */
+#if 0
+            diag_printf("%s.%d\n", __FUNCTION__, __LINE__);
+            diag_dump_buf(&ip6->ip6_src, 16);
+            diag_dump_buf(&ip6->ip6_dst, 16);
+#endif
+	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
+	    IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
+		/*
+		 * XXX: "badscope" is not very suitable for a multicast source.
+		 */
+		ip6stat.ip6s_badscope++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+                log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+		goto bad;
+	}
+	if ((IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
+	     IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) &&
+	    (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
+		ip6stat.ip6s_badscope++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+                log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+		goto bad;
+	}
+	if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
+	    !(m->m_flags & M_LOOP)) {
+		/*
+		 * In this case, the packet should come from the loopback
+		 * interface.  However, we cannot just check the if_flags,
+		 * because ip6_mloopback() passes the "actual" interface
+		 * as the outgoing/incoming interface.
+		 */
+		ip6stat.ip6s_badscope++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+                log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+		goto bad;
+	}
+	     
+	/*
+	 * The following check is not documented in specs.  A malicious
+	 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
+	 * and bypass security checks (act as if it was from 127.0.0.1 by using
+	 * IPv6 src ::ffff:127.0.0.1).  Be cautious.
+	 *
+	 * This check chokes if we are in an SIIT cloud.  As none of BSDs
+	 * support IPv4-less kernel compilation, we cannot support SIIT
+	 * environment at all.  So, it makes more sense for us to reject any
+	 * malicious packets for non-SIIT environment, than try to do a
+	 * partical support for SIIT environment.
+	 */
+	if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
+	    IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
+		ip6stat.ip6s_badscope++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+                log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+		goto bad;
+	}
+#if 0
+	/*
+	 * Reject packets with IPv4 compatible addresses (auto tunnel).
+	 *
+	 * The code forbids auto tunnel relay case in RFC1933 (the check is
+	 * stronger than RFC1933).  We may want to re-enable it if mech-xx
+	 * is revised to forbid relaying case.
+	 */
+	if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
+	    IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
+		ip6stat.ip6s_badscope++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+		goto bad;
+	}
+#endif
+
+	/* drop packets if interface ID portion is already filled */
+	if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
+		if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
+		    ip6->ip6_src.s6_addr16[1]) {
+			ip6stat.ip6s_badscope++;
+                        log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+			goto bad;
+		}
+		if ((IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
+		     IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) &&
+		    ip6->ip6_dst.s6_addr16[1]) {
+			ip6stat.ip6s_badscope++;
+                        log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+			goto bad;
+		}
+	}
+
+	/*
+	 * Embed interface ID as the zone ID for interface-local and
+	 * link-local addresses.
+	 * XXX: KAME assumes one-to-one mapping between interfaces and
+	 * links.
+	 */
+	if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
+		ip6->ip6_src.s6_addr16[1]
+			= htons(m->m_pkthdr.rcvif->if_index);
+	if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
+	    IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
+		ip6->ip6_dst.s6_addr16[1]
+			= htons(m->m_pkthdr.rcvif->if_index);
+
+#if 0 /* this case seems to be unnecessary. (jinmei, 20010401) */
+	/*
+	 * We use rt->rt_ifp to determine if the address is ours or not.
+	 * If rt_ifp is lo0, the address is ours.
+	 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
+	 * so any address under fe80::%lo0/64 will be mistakenly considered
+	 * local.  The special case is supplied to handle the case properly
+	 * by actually looking at interface addresses
+	 * (using in6ifa_ifpwithaddr).
+	 */
+	if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
+	    IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
+		if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
+			icmp6_error(m, ICMP6_DST_UNREACH,
+			    ICMP6_DST_UNREACH_ADDR, 0);
+			/* m is already freed */
+			return;
+		}
+
+		ours = 1;
+		deliverifp = m->m_pkthdr.rcvif;
+		goto hbhcheck;
+	}
+#endif
+
+	/*
+	 * Multicast check
+	 */
+	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+	  	struct	in6_multi *in6m = 0;
+
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
+		/*
+		 * See if we belong to the destination multicast group on the
+		 * arrival interface.
+		 */
+		IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
+// TEMP
+                if (0) {
+                    struct in6_addr *_addr = &ip6->ip6_dst;
+                    struct ifnet *_ifp = m->m_pkthdr.rcvif;
+                    struct ifmultiaddr *_ifma; 
+                    diag_printf("Lookup Multi = %p\n", in6m);
+                    diag_dump_buf(_addr, 16);
+                    diag_printf("=====================================================================\n");
+                    for (_ifma = (_ifp)->if_multiaddrs.lh_first; _ifma; 
+                         _ifma = _ifma->ifma_link.le_next) { 
+                        diag_dump_buf(&((struct sockaddr_in6 *)_ifma->ifma_addr)->sin6_addr, 16);
+                        diag_printf("---------------------------------------------------------------------\n");
+                    } 
+                }
+// TEMP
+		if (in6m)
+			ours = 1;
+		else if (!ip6_mrouter) {
+			ip6stat.ip6s_notmember++;
+			ip6stat.ip6s_cantforward++;
+			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
+                        log(LOG_FAIL, "%s.%d - wrong multi group\n", 
+                            __FUNCTION__, __LINE__);
+                        log_dump(LOG_FAIL, &ip6->ip6_dst, 16);
+			goto bad;
+		}
+		deliverifp = m->m_pkthdr.rcvif;
+		goto hbhcheck;
+	}
+
+	/*
+	 *  Unicast check
+	 */
+#ifdef MEASURE_PERFORMANCE
+	ctr_beg = read_tsc();
+#endif
+	switch (ip6_ours_check_algorithm) {
+#ifdef MEASURE_PERFORMANCE
+	case OURS_CHECK_ALG_LINEAR:
+	/* traditional linear search: just for measurement */
+	{
+		struct in6_ifaddr *ia;
+
+		for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
+			if ((ia->ia6_flags & IN6_IFF_NOTREADY) == 0 &&
+			    IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
+					       &ip6->ip6_dst)) {
+#ifdef MEASURE_PERFORMANCE
+				ctr_end = read_tsc();
+#ifdef MEASURE_PERFORMANCE_UDPONLY
+				if (ip6->ip6_nxt == IPPROTO_UDP)
+#else
+				if (1)
+#endif
+					add_performance_log(ctr_end - ctr_beg,
+							    &ip6->ip6_dst);
+#endif
+				/* record address information into m_aux. */
+				(void)ip6_setdstifaddr(m, ia);
+
+				ours = 1;
+				deliverifp = ia->ia_ifp;
+				goto hbhcheck;
+			}
+		}
+	}
+	break;
+	case OURS_CHECK_ALG_HASH:
+	case OURS_CHECK_ALG_LARGEHASH:
+	{
+		struct in6_ifaddr *ia;
+		struct in6hash *ih = NULL;
+
+		if ((ih = in6h_lookup(&ip6->ip6_dst, m->m_pkthdr.rcvif)) !=
+		    NULL && (ia = ih->in6h_ifa) != NULL) {
+#ifdef MEASURE_PERFORMANCE
+			ctr_end = read_tsc();
+#ifdef MEASURE_PERFORMANCE_UDPONLY
+			if (ip6->ip6_nxt == IPPROTO_UDP)
+#else
+			if (1)
+#endif
+				add_performance_log(ctr_end - ctr_beg,
+						    &ip6->ip6_dst);
+#endif
+
+			/* record address information into m_aux. */
+			(void)ip6_setdstifaddr(m, ia);
+
+			ours = 1;
+			deliverifp = m->m_pkthdr.rcvif;
+			goto hbhcheck;
+		}
+	}
+	break;
+#endif /* MEASURE_PERFORMANCE */
+	default:
+		/*
+		 * XXX: I intentionally broke our indentation rule here,
+		 *      since this switch-case is just for measurement and
+		 *      therefore should soon be removed.
+		 */
+	if (ip6_forward_rt.ro_rt != NULL &&
+	    (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 && 
+	    IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
+			       &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
+		ip6stat.ip6s_forward_cachehit++;
+	else {
+		struct sockaddr_in6 *dst6;
+#ifdef SCOPEDROUTING
+		int64_t dstzone;
+#endif
+
+		if (ip6_forward_rt.ro_rt) {
+			/* route is down or destination is different */
+			ip6stat.ip6s_forward_cachemiss++;
+			RTFREE(ip6_forward_rt.ro_rt);
+			ip6_forward_rt.ro_rt = 0;
+		}
+
+		bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
+		dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
+		dst6->sin6_len = sizeof(struct sockaddr_in6);
+		dst6->sin6_family = AF_INET6;
+		dst6->sin6_addr = ip6->ip6_dst;
+#ifdef SCOPEDROUTING
+		if ((dstzone = in6_addr2zoneid(m->m_pkthdr.rcvif,
+					       &ip6->ip6_dst)) < 0) {
+			ip6stat.ip6s_badscope++;
+			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+                        log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+			goto bad;
+		}
+		ip6_forward_rt.ro_dst.sin6_scope_id = dstzone;
+#endif
+
+#ifdef __FreeBSD__
+		rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING);
+#else
+		rtalloc((struct route *)&ip6_forward_rt);
+#endif
+	}
+
+#define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
+
+	/*
+	 * Accept the packet if the forwarding interface to the destination
+	 * according to the routing table is the loopback interface,
+	 * unless the associated route has a gateway.
+	 * Note that this approach causes to accept a packet if there is a
+	 * route to the loopback interface for the destination of the packet.
+	 * But we think it's even useful in some situations, e.g. when using
+	 * a special daemon which wants to intercept the packet.
+	 *
+	 * XXX: some OSes automatically make a cloned route for the destination
+	 * of an outgoing packet.  If the outgoing interface of the packet
+	 * is a loopback one, the kernel would consider the packet to be
+	 * accepted, even if we have no such address assinged on the interface.
+	 * We check the cloned flag of the route entry to reject such cases,
+	 * assuming that route entries for our own addresses are not made by
+	 * cloning (it should be true because in6_addloop explicitly installs
+	 * the host route).  However, we might have to do an explicit check
+	 * while it would be less efficient.  Or, should we rather install a
+	 * reject route for such a case?
+	 */
+	if (ip6_forward_rt.ro_rt &&
+	    (ip6_forward_rt.ro_rt->rt_flags &
+	     (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
+#ifdef RTF_WASCLONED
+	    !(ip6_forward_rt.ro_rt->rt_flags & RTF_WASCLONED) &&
+#endif
+#ifdef RTF_CLONED
+	    !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) &&
+#endif
+#if 0
+	    /*
+	     * The check below is redundant since the comparison of
+	     * the destination and the key of the rtentry has
+	     * already done through looking up the routing table.
+	     */
+	    IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
+				&rt6_key(ip6_forward_rt.ro_rt)->sin6_addr)
+#endif
+	    ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
+		struct in6_ifaddr *ia6 =
+			(struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa;
+
+#ifdef MEASURE_PERFORMANCE
+		ctr_end = read_tsc();
+#ifdef MEASURE_PERFORMANCE_UDPONLY
+		if (ip6->ip6_nxt == IPPROTO_UDP)
+#else
+		if (1)
+#endif
+			add_performance_log(ctr_end - ctr_beg, &ip6->ip6_dst);
+#endif
+
+		/*
+		 * record address information into m_aux.
+		 */
+		(void)ip6_setdstifaddr(m, ia6);
+
+		/*
+		 * packets to a tentative, duplicated, or somehow invalid
+		 * address must not be accepted.
+		 */
+		if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
+			/* this address is ready */
+			ours = 1;
+			deliverifp = ia6->ia_ifp;	/* correct? */
+#if defined(__FreeBSD__) && __FreeBSD__ >= 4
+			/* Count the packet in the ip address stats */
+			ia6->ia_ifa.if_ipackets++;
+			ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
+#elif defined(__bsdi__) && _BSDI_VERSION >= 199802
+			/* Count the packet in the ip address stats */
+			ia6->ia_ifa.ifa_ipackets++;
+			ia6->ia_ifa.ifa_ibytes += m->m_pkthdr.len;
+#endif
+			goto hbhcheck;
+		} else {
+			/* address is not ready, so discard the packet. */
+			nd6log((LOG_INFO,
+			    "ip6_input: packet to an unready address %s->%s\n",
+			    ip6_sprintf(&ip6->ip6_src),
+			    ip6_sprintf(&ip6->ip6_dst)));
+			goto bad;
+		}
+	}
+	} /* XXX indentation (see above) */
+
+#ifdef MEASURE_PERFORMANCE
+	/* we detected that packet is not ours thru the basic algorithm */
+	ctr_end = read_tsc();
+#ifdef MEASURE_PERFORMANCE_UDPONLY
+	if (ip6->ip6_nxt == IPPROTO_UDP)
+#else
+	if (1)
+#endif
+		add_performance_log(ctr_end - ctr_beg, &ip6->ip6_dst);
+#endif
+
+	/*
+	 * FAITH(Firewall Aided Internet Translator)
+	 */
+#if defined(NFAITH) && 0 < NFAITH
+	if (ip6_keepfaith) {
+		if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
+		 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
+			/* XXX do we need more sanity checks? */
+			ours = 1;
+			deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */
+			goto hbhcheck;
+		}
+	}
+#endif
+
+#ifdef NATPT
+	/*
+	 * NAT-PT (Network Address Translation - Protocol Translation)
+	 */
+	if (ip6_protocol_tr) {
+		struct mbuf *m1 = NULL;
+
+		switch (natpt_in6(m, &m1)) {
+		case IPPROTO_IP:
+			goto processpacket;
+		case IPPROTO_IPV4:
+			ip_forward(m1, 0);
+			break;
+		case IPPROTO_IPV6:
+			ip6_forward(m1, 0);
+			break;
+		case IPPROTO_MAX:		/* discard this packet	*/
+		default:
+			break;
+		case IPPROTO_DONE:		/* discard without free	*/
+			return;
+		}
+
+		if (m != m1)
+			m_freem(m);
+
+		return;
+	}
+
+ processpacket:
+#endif
+
+#if 0
+    {
+	/*
+	 * Last resort: check in6_ifaddr for incoming interface.
+	 * The code is here until I update the "goto ours hack" code above
+	 * working right.
+	 */
+	struct ifaddr *ifa;
+	for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
+	     ifa;
+	     ifa = ifa->ifa_list.tqe_next) {
+		if (ifa->ifa_addr == NULL)
+			continue;	/* just for safety */
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
+			ours = 1;
+			deliverifp = ifa->ifa_ifp;
+			goto hbhcheck;
+		}
+	}
+    }
+#endif
+
+	/*
+	 * Now there is no reason to process the packet if it's not our own
+	 * and we're not a router.
+	 */
+	if (!ip6_forwarding) {
+		ip6stat.ip6s_cantforward++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
+                log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+		goto bad;
+	}
+
+ hbhcheck:
+	/*
+	 * record address information into m_aux, if we don't have one yet.
+	 * note that we are unable to record it, if the address is not listed
+	 * as our interface address (e.g. multicast addresses, addresses
+	 * within FAITH prefixes and such).
+	 */
+	if (deliverifp && !ip6_getdstifaddr(m)) {
+		struct in6_ifaddr *ia6;
+
+		ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
+		if (ia6) {
+			if (!ip6_setdstifaddr(m, ia6)) {
+				/*
+				 * XXX maybe we should drop the packet here,
+				 * as we could not provide enough information
+				 * to the upper layers.
+				 */
+			}
+		}
+	}
+
+	/*
+	 * Process Hop-by-Hop options header if it's contained.
+	 * m may be modified in ip6_hopopts_input().
+	 * If a JumboPayload option is included, plen will also be modified.
+	 */
+	plen = (u_int32_t)ntohs(ip6->ip6_plen);
+	if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
+		struct ip6_hbh *hbh;
+
+		if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
+#if 0	/*touches NULL pointer*/
+			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
+#endif
+			return;	/* m have already been freed */
+		}
+
+		/* adjust pointer */
+		ip6 = mtod(m, struct ip6_hdr *);
+
+		/*
+		 * if the payload length field is 0 and the next header field
+		 * indicates Hop-by-Hop Options header, then a Jumbo Payload
+		 * option MUST be included.
+		 */
+		if (ip6->ip6_plen == 0 && plen == 0) {
+			/*
+			 * Note that if a valid jumbo payload option is
+			 * contained, ip6_hoptops_input() must set a valid
+			 * (non-zero) payload length to the variable plen. 
+			 */
+			ip6stat.ip6s_badoptions++;
+			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
+			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
+			icmp6_error(m, ICMP6_PARAM_PROB,
+				    ICMP6_PARAMPROB_HEADER,
+				    (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
+			return;
+		}
+#ifndef PULLDOWN_TEST
+		/* ip6_hopopts_input() ensures that mbuf is contiguous */
+		hbh = (struct ip6_hbh *)(ip6 + 1);
+#else
+		IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
+			sizeof(struct ip6_hbh));
+		if (hbh == NULL) {
+			ip6stat.ip6s_tooshort++;
+			return;
+		}
+#endif
+		nxt = hbh->ip6h_nxt;
+
+		/*
+		 * accept the packet if a router alert option is included
+		 * and we act as an IPv6 router.
+		 */
+		if (rtalert != ~0 && ip6_forwarding)
+			ours = 1;
+	} else
+		nxt = ip6->ip6_nxt;
+
+	/*
+	 * Check that the amount of data in the buffers
+	 * is as at least much as the IPv6 header would have us expect.
+	 * Trim mbufs if longer than we expect.
+	 * Drop packet if shorter than we expect.
+	 */
+	if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
+		ip6stat.ip6s_tooshort++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
+		goto bad;
+	}
+	if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
+		if (m->m_len == m->m_pkthdr.len) {
+			m->m_len = sizeof(struct ip6_hdr) + plen;
+			m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
+		} else
+			m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
+	}
+
+	/*
+	 * Forward if desirable.
+	 */
+	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+		/*
+		 * If we are acting as a multicast router, all
+		 * incoming multicast packets are passed to the
+		 * kernel-level multicast forwarding function.
+		 * The packet is returned (relatively) intact; if
+		 * ip6_mforward() returns a non-zero value, the packet
+		 * must be discarded, else it may be accepted below.
+		 */
+		if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
+			ip6stat.ip6s_cantforward++;
+			m_freem(m);
+			return;
+		}
+		if (!ours) {
+			m_freem(m);
+			return;
+		}
+	} else if (!ours) {
+		ip6_forward(m, 0);
+		return;
+	}	
+
+	ip6 = mtod(m, struct ip6_hdr *);
+
+	/*
+	 * Malicious party may be able to use IPv4 mapped addr to confuse
+	 * tcp/udp stack and bypass security checks (act as if it was from
+	 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1).  Be cautious.
+	 *
+	 * For SIIT end node behavior, you may want to disable the check.
+	 * However, you will  become vulnerable to attacks using IPv4 mapped
+	 * source.
+	 */
+	if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
+	    IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
+		ip6stat.ip6s_badscope++;
+		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
+                log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+		goto bad;
+	}
+
+	/*
+	 * Tell launch routine the next header
+	 */
+#if defined(__NetBSD__) && defined(IFA_STATS)
+	if (deliverifp != NULL) {
+		struct in6_ifaddr *ia6;
+		ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
+		if (ia6)
+			ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
+	}
+#endif
+	ip6stat.ip6s_delivered++;
+	in6_ifstat_inc(deliverifp, ifs6_in_deliver);
+	nest = 0;
+
+	while (nxt != IPPROTO_DONE) {
+		if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
+			ip6stat.ip6s_toomanyhdr++;
+                        log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+			goto bad;
+		}
+
+		/*
+		 * protection against faulty packet - there should be
+		 * more sanity checks in header chain processing.
+		 */
+		if (m->m_pkthdr.len < off) {
+			ip6stat.ip6s_tooshort++;
+			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
+                        log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+			goto bad;
+		}
+
+#if 0
+		/*
+		 * do we need to do it for every header?  yeah, other
+		 * functions can play with it (like re-allocate and copy).
+		 */
+		mhist = ip6_addaux(m);
+		if (mhist && M_TRAILINGSPACE(mhist) >= sizeof(nxt)) {
+			hist = mtod(mhist, caddr_t) + mhist->m_len;
+			bcopy(&nxt, hist, sizeof(nxt));
+			mhist->m_len += sizeof(nxt);
+		} else {
+			ip6stat.ip6s_toomanyhdr++;
+                        log(LOG_FAIL, "%s.%d\n", __FUNCTION__, __LINE__);
+			goto bad;
+		}
+#endif
+
+#if defined(IPSEC) && !defined(__OpenBSD__)
+		/*
+		 * enforce IPsec policy checking if we are seeing last header.
+		 * note that we do not visit this with protocols with pcb layer
+		 * code - like udp/tcp/raw ip.
+		 */
+		if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
+		    ipsec6_in_reject(m, NULL)) {
+			ipsec6stat.in_polvio++;
+			goto bad;
+		}
+#endif
+#ifdef MIP6
+		/*
+		 * XXX
+		 * check if the packet was tunneled after all extion
+		 * headers have been processed.  get from Ericsson
+		 * code.  need more consideration.
+		 */
+		if ((nxt != IPPROTO_HOPOPTS) && (nxt != IPPROTO_DSTOPTS) &&
+		    (nxt != IPPROTO_ROUTING) && (nxt != IPPROTO_FRAGMENT) &&
+		    (nxt != IPPROTO_ESP) && (nxt != IPPROTO_AH)) {
+			if (mip6_route_optimize(m))
+				goto bad;
+		}
+#endif /* MIP6 */		
+		nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
+	}
+	return;
+ bad:
+	m_freem(m);
+}
+
+/*
+ * set/grab in6_ifaddr correspond to IPv6 destination address.
+ * XXX backward compatibility wrapper
+ */
+static struct mbuf *
+ip6_setdstifaddr(m, ia6)
+	struct mbuf *m;
+	struct in6_ifaddr *ia6;
+{
+	struct mbuf *n;
+
+	n = ip6_addaux(m);
+	if (n)
+		mtod(n, struct ip6aux *)->ip6a_dstia6 = ia6;
+	return n;	/* NULL if failed to set */
+}
+
+struct in6_ifaddr *
+ip6_getdstifaddr(m)
+	struct mbuf *m;
+{
+	struct mbuf *n;
+
+	n = ip6_findaux(m);
+	if (n)
+		return mtod(n, struct ip6aux *)->ip6a_dstia6;
+	else
+		return NULL;
+}
+
+/*
+ * Hop-by-Hop options header processing. If a valid jumbo payload option is
+ * included, the real payload length will be stored in plenp.
+ */
+static int
+ip6_hopopts_input(plenp, rtalertp, mp, offp)
+	u_int32_t *plenp;
+	u_int32_t *rtalertp;	/* XXX: should be stored more smart way */
+	struct mbuf **mp;
+	int *offp;
+{
+	struct mbuf *m = *mp;
+	int off = *offp, hbhlen;
+	struct ip6_hbh *hbh;
+	u_int8_t *opt;
+
+	/* validation of the length of the header */
+#ifndef PULLDOWN_TEST
+	IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
+	hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
+	hbhlen = (hbh->ip6h_len + 1) << 3;
+
+	IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
+	hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
+#else
+	IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
+		sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
+	if (hbh == NULL) {
+		ip6stat.ip6s_tooshort++;
+		return -1;
+	}
+	hbhlen = (hbh->ip6h_len + 1) << 3;
+	IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
+		hbhlen);
+	if (hbh == NULL) {
+		ip6stat.ip6s_tooshort++;
+		return -1;
+	}
+#endif
+	off += hbhlen;
+	hbhlen -= sizeof(struct ip6_hbh);
+	opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
+
+	if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
+				hbhlen, rtalertp, plenp) < 0)
+		return(-1);
+
+	*offp = off;
+	*mp = m;
+	return(0);
+}
+
+/*
+ * Search header for all Hop-by-hop options and process each option.
+ * This function is separate from ip6_hopopts_input() in order to
+ * handle a case where the sending node itself process its hop-by-hop
+ * options header. In such a case, the function is called from ip6_output().
+ *
+ * The function assumes that hbh header is located right after the IPv6 header
+ * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
+ * opthead + hbhlen is located in continuous memory region.
+ */
+int
+ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp)
+	struct mbuf *m;
+	u_int8_t *opthead;
+	int hbhlen;
+	u_int32_t *rtalertp;
+	u_int32_t *plenp;
+{
+	struct ip6_hdr *ip6;
+	int optlen = 0;
+	u_int8_t *opt = opthead;
+	u_int16_t rtalert_val;
+	u_int32_t jumboplen;
+	const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
+
+	for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
+		switch (*opt) {
+		case IP6OPT_PAD1:
+			optlen = 1;
+			break;
+		case IP6OPT_PADN:
+			if (hbhlen < IP6OPT_MINLEN) {
+				ip6stat.ip6s_toosmall++;
+				goto bad;
+			}
+			optlen = *(opt + 1) + 2;
+			break;
+		case IP6OPT_RTALERT:
+			/* XXX may need check for alignment */
+			if (hbhlen < IP6OPT_RTALERT_LEN) {
+				ip6stat.ip6s_toosmall++;
+				goto bad;
+			}
+			if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
+				/* XXX stat */
+				icmp6_error(m, ICMP6_PARAM_PROB,
+					    ICMP6_PARAMPROB_HEADER,
+					    erroff + opt + 1 - opthead);
+				return(-1);
+			}
+			optlen = IP6OPT_RTALERT_LEN;
+			bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
+			*rtalertp = ntohs(rtalert_val);
+			break;
+		case IP6OPT_JUMBO:
+			/* XXX may need check for alignment */
+			if (hbhlen < IP6OPT_JUMBO_LEN) {
+				ip6stat.ip6s_toosmall++;
+				goto bad;
+			}
+			if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
+				/* XXX stat */
+				icmp6_error(m, ICMP6_PARAM_PROB,
+					    ICMP6_PARAMPROB_HEADER,
+					    erroff + opt + 1 - opthead);
+				return(-1);
+			}
+			optlen = IP6OPT_JUMBO_LEN;
+
+			/*
+			 * IPv6 packets that have non 0 payload length
+			 * must not contain a jumbo payload option.
+			 */
+			ip6 = mtod(m, struct ip6_hdr *);
+			if (ip6->ip6_plen) {
+				ip6stat.ip6s_badoptions++;
+				icmp6_error(m, ICMP6_PARAM_PROB,
+					    ICMP6_PARAMPROB_HEADER,
+					    erroff + opt - opthead);
+				return(-1);
+			}
+
+			/*
+			 * We may see jumbolen in unaligned location, so
+			 * we'd need to perform bcopy().
+			 */
+			bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
+			jumboplen = (u_int32_t)htonl(jumboplen);
+
+#if 1
+			/*
+			 * if there are multiple jumbo payload options,
+			 * *plenp will be non-zero and the packet will be
+			 * rejected.
+			 * the behavior may need some debate in ipngwg -
+			 * multiple options does not make sense, however,
+			 * there's no explicit mention in specification.
+			 */
+			if (*plenp != 0) {
+				ip6stat.ip6s_badoptions++;
+				icmp6_error(m, ICMP6_PARAM_PROB,
+					    ICMP6_PARAMPROB_HEADER,
+					    erroff + opt + 2 - opthead);
+				return(-1);
+			}
+#endif
+
+			/*
+			 * jumbo payload length must be larger than 65535.
+			 */
+			if (jumboplen <= IPV6_MAXPACKET) {
+				ip6stat.ip6s_badoptions++;
+				icmp6_error(m, ICMP6_PARAM_PROB,
+					    ICMP6_PARAMPROB_HEADER,
+					    erroff + opt + 2 - opthead);
+				return(-1);
+			}
+			*plenp = jumboplen;
+
+			break;
+		default:		/* unknown option */
+			if (hbhlen < IP6OPT_MINLEN) {
+				ip6stat.ip6s_toosmall++;
+				goto bad;
+			}
+			optlen = ip6_unknown_opt(opt, m,
+			    erroff + opt - opthead);
+			if (optlen == -1)
+				return(-1);
+			optlen += 2;
+			break;
+		}
+	}
+
+	return(0);
+
+  bad:
+	m_freem(m);
+	return(-1);
+}
+
+/*
+ * Unknown option processing.
+ * The third argument `off' is the offset from the IPv6 header to the option,
+ * which is necessary if the IPv6 header the and option header and IPv6 header
+ * is not continuous in order to return an ICMPv6 error.
+ */
+int
+ip6_unknown_opt(optp, m, off)
+	u_int8_t *optp;
+	struct mbuf *m;
+	int off;
+{
+	struct ip6_hdr *ip6;
+
+	switch (IP6OPT_TYPE(*optp)) {
+	case IP6OPT_TYPE_SKIP: /* ignore the option */
+		return((int)*(optp + 1));
+	case IP6OPT_TYPE_DISCARD:	/* silently discard */
+		m_freem(m);
+		return(-1);
+	case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
+		ip6stat.ip6s_badoptions++;
+		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
+		return(-1);
+	case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
+		ip6stat.ip6s_badoptions++;
+		ip6 = mtod(m, struct ip6_hdr *);
+		if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
+		    (m->m_flags & (M_BCAST|M_MCAST)))
+			m_freem(m);
+		else
+			icmp6_error(m, ICMP6_PARAM_PROB,
+				    ICMP6_PARAMPROB_OPTION, off);
+		return(-1);
+	}
+
+	m_freem(m);		/* XXX: NOTREACHED */
+	return(-1);
+}
+
+/*
+ * Create the "control" list for this pcb.
+ * The function will not modify mbuf chain at all.
+ *
+ * with KAME mbuf chain restriction:
+ * The routine will be called from upper layer handlers like tcp6_input().
+ * Thus the routine assumes that the caller (tcp6_input) have already
+ * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
+ * very first mbuf on the mbuf chain.
+ */
+void
+ip6_savecontrol(in6p, ip6, m, ctl, prevctlp)
+#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(HAVE_NRL_INPCB)
+	struct inpcb *in6p;
+#else
+	struct in6pcb *in6p;
+#endif
+	struct ip6_hdr *ip6;
+	struct mbuf *m;
+	struct ip6_recvpktopts *ctl, **prevctlp;
+{
+#define IS2292(x, y)	((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
+	struct mbuf **mp;
+	struct cmsghdr *cm = NULL;
+	struct ip6_recvpktopts *prevctl = NULL;
+#ifdef HAVE_NRL_INPCB
+# define in6p_flags	inp_flags
+#endif
+#ifdef __bsdi__
+# define sbcreatecontrol	so_cmsg
+#endif
+	int privileged = 1;
+
+	if (ctl == NULL)	/* validity check */
+		return;
+	bzero(ctl, sizeof(*ctl)); /* XXX is it really OK? */
+	mp = &ctl->head;
+
+	/*
+	 * If caller wanted to keep history, allocate space to store the
+	 * history at the first time.
+	 */
+	if (prevctlp) {
+		if (*prevctlp == NULL) {
+			MALLOC(prevctl, struct ip6_recvpktopts *,
+			       sizeof(*prevctl), M_IP6OPT, M_NOWAIT);
+			if (prevctl == NULL) {
+				printf("ip6_savecontrol: can't allocate "
+				       " enough space for history\n");
+				return;
+			}
+			bzero(prevctl, sizeof(*prevctl));
+			*prevctlp = prevctl;
+		}
+		else
+			prevctl = *prevctlp;
+	}
+
+
+#ifdef SO_TIMESTAMP
+	if ((in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0) {
+		struct timeval tv;
+
+		microtime(&tv);
+		*mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
+				      SCM_TIMESTAMP, SOL_SOCKET);
+		if (*mp) {
+			/* always set regradless of the previous value */
+			ctl->timestamp = *mp;
+			mp = &(*mp)->m_next;
+		}
+	}
+#endif
+
+	/* RFC 2292 sec. 5 */
+	if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
+		struct in6_pktinfo pi6, *prevpi = NULL;
+		bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
+		if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr) ||
+		    IN6_IS_ADDR_MC_INTFACELOCAL(&pi6.ipi6_addr))
+			pi6.ipi6_addr.s6_addr16[1] = 0;
+		pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
+					? m->m_pkthdr.rcvif->if_index
+					: 0;
+		if (prevctl && prevctl->pktinfo) {
+			cm = mtod(prevctl->pktinfo, struct cmsghdr *);
+			prevpi = (struct in6_pktinfo *)CMSG_DATA(cm);
+		}
+
+		/*
+		 * Make a new option only if this is the first time or if the
+		 * option value is chaned from last time.
+		 */
+		if (prevpi == NULL || bcmp(prevpi, &pi6, sizeof(pi6))) {
+			*mp = sbcreatecontrol((caddr_t) &pi6,
+			     sizeof(struct in6_pktinfo),
+			     IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO),
+			     IPPROTO_IPV6);
+			if (*mp) {
+				ctl->pktinfo = *mp;
+				mp = &(*mp)->m_next;
+			}
+		}
+	}
+
+	if ((in6p->in6p_flags & IN6P_HOPLIMIT) != 0) {
+		int hlim = ip6->ip6_hlim & 0xff, oldhlim = -1;
+
+		if (prevctl && prevctl->hlim) {
+			cm = mtod(prevctl->hlim, struct cmsghdr *);
+			bcopy(CMSG_DATA(cm), &oldhlim, sizeof(oldhlim));
+			oldhlim &= 0xff;
+		}
+
+		if (oldhlim < 0 || hlim != oldhlim) {
+			*mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
+			    IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
+			    IPPROTO_IPV6);
+			if (*mp) {
+				ctl->hlim = *mp;
+				mp = &(*mp)->m_next;
+			}
+		}
+	}
+
+	if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
+		u_int32_t flowinfo;
+		int oflowinfo = -1;
+		int v;
+
+		flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
+		flowinfo >>= 20;
+
+		if (prevctl && prevctl->hlim) {
+			cm = mtod(prevctl->hlim, struct cmsghdr *);
+			bcopy(CMSG_DATA(cm), &v, sizeof(v));
+			oflowinfo = v & 0xff;
+		}
+
+		if (oflowinfo < 0 || flowinfo != oflowinfo) {
+			v = flowinfo & 0xff;
+			*mp = sbcreatecontrol((caddr_t) &v, sizeof(v),
+			    IPV6_TCLASS, IPPROTO_IPV6);
+			if (*mp) {
+				ctl->hlim = *mp;
+				mp = &(*mp)->m_next;
+			}
+		}
+	}
+
+	/*
+	 * IPV6_HOPOPTS socket option. We require super-user privilege
+	 * for the option, but it might be too strict, since there might
+	 * be some hop-by-hop options which can be returned to normal user.
+	 * See RFC 2292 section 6.
+	 */
+	if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
+		/*
+		 * Check if a hop-by-hop options header is contatined in the
+		 * received packet, and if so, store the options as ancillary
+		 * data. Note that a hop-by-hop options header must be
+		 * just after the IPv6 header, which fact is assured through
+		 * the IPv6 input processing.
+		 */
+		struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
+		if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
+			struct ip6_hbh *hbh, *prevhbh = NULL;
+			int hbhlen = 0, prevhbhlen = 0;
+#ifdef PULLDOWN_TEST
+			struct mbuf *ext;
+#endif
+
+#ifndef PULLDOWN_TEST
+			hbh = (struct ip6_hbh *)(ip6 + 1);
+			hbhlen = (hbh->ip6h_len + 1) << 3;
+#else
+			ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
+			    ip6->ip6_nxt);
+			if (ext == NULL) {
+				ip6stat.ip6s_tooshort++;
+				return;
+			}
+			hbh = mtod(ext, struct ip6_hbh *);
+			hbhlen = (hbh->ip6h_len + 1) << 3;
+			if (hbhlen != ext->m_len) {
+				m_freem(ext);
+				ip6stat.ip6s_tooshort++;
+				return;
+			}
+#endif
+
+			if (prevctl && prevctl->hbh) {
+				cm = mtod(prevctl->hbh, struct cmsghdr *);
+				prevhbh = (struct ip6_hbh *)CMSG_DATA(cm);
+				prevhbhlen = (prevhbh->ip6h_len + 1) << 3;
+			}
+			/*
+			 * Check if there's difference between the current
+			 * and previous HbH headers.
+			 * XXX: should the next header field be ignored?
+			 */
+			if (prevhbh == NULL || hbhlen != prevhbhlen ||
+			    bcmp(prevhbh, hbh, hbhlen)) {
+				/*
+				 * XXX: We copy whole the header even if a
+				 * jumbo payload option is included, which
+				 * option is to be removed before returning
+				 * in the RFC 2292.
+				 * Note: this constraint is removed in
+				 * 2292bis.
+				 */
+				*mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
+				    IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
+				    IPPROTO_IPV6);
+				if (*mp) {
+					ctl->hbh = *mp;
+					mp = &(*mp)->m_next;
+				}
+			}
+#ifdef PULLDOWN_TEST
+			m_freem(ext);
+#endif
+		}
+	}
+
+	if ((in6p->in6p_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
+		struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
+		int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
+
+		/*
+		 * Search for destination options headers or routing
+		 * header(s) through the header chain, and stores each
+		 * header as ancillary data.
+		 * Note that the order of the headers remains in
+		 * the chain of ancillary data.
+		 */
+		while (1) {	/* is explicit loop prevention necessary? */
+			struct ip6_ext *ip6e = NULL;
+			int elen;
+#ifdef PULLDOWN_TEST
+			struct mbuf *ext = NULL;
+#endif
+
+			/*
+			 * if it is not an extension header, don't try to
+			 * pull it from the chain.
+			 */
+			switch (nxt) {
+			case IPPROTO_DSTOPTS:
+			case IPPROTO_ROUTING:
+			case IPPROTO_HOPOPTS:
+			case IPPROTO_AH: /* is it possible? */
+				break;
+			default:
+				goto loopend;
+			}
+
+#ifndef PULLDOWN_TEST
+			if (off + sizeof(*ip6e) > m->m_len)
+				goto loopend;
+			ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
+			if (nxt == IPPROTO_AH)
+				elen = (ip6e->ip6e_len + 2) << 2;
+			else
+				elen = (ip6e->ip6e_len + 1) << 3;
+			if (off + elen > m->m_len)
+				goto loopend;
+#else
+			ext = ip6_pullexthdr(m, off, nxt);
+			if (ext == NULL) {
+				ip6stat.ip6s_tooshort++;
+				return;
+			}
+			ip6e = mtod(ext, struct ip6_ext *);
+			if (nxt == IPPROTO_AH)
+				elen = (ip6e->ip6e_len + 2) << 2;
+			else
+				elen = (ip6e->ip6e_len + 1) << 3;
+			if (elen != ext->m_len) {
+				m_freem(ext);
+				ip6stat.ip6s_tooshort++;
+				return;
+			}
+#endif
+
+			switch (nxt) {
+			case IPPROTO_DSTOPTS:
+			{
+				struct ip6_dest *prevdest = NULL;
+				int prevdestlen = 0;
+
+				if (!(in6p->in6p_flags & IN6P_DSTOPTS))
+					break;
+
+				/*
+				 * We also require super-user privilege for
+				 * the option.  See comments on IN6_HOPOPTS.
+				 */
+
+				if (prevctl && prevctl->dest) {
+					cm = mtod(prevctl->dest,
+						  struct cmsghdr *);
+					prevdest = (struct ip6_dest *)CMSG_DATA(cm);
+					prevdestlen =
+						(prevdest->ip6d_len + 1) << 3;
+				}
+
+				/*
+				 * If this is the 1st dst opt header
+				 * we enconter and this header is
+				 * not different from the previous one,
+				 * simply ignore the header.
+				 */
+				if (ctl->dest == NULL && prevdest &&
+				    prevdestlen == elen &&
+				    bcmp(ip6e, prevdest, elen) == 0)
+					break;
+
+				*mp = sbcreatecontrol((caddr_t)ip6e, elen,
+						      IS2292(IPV6_2292DSTOPTS,
+							     IPV6_DSTOPTS),
+						      IPPROTO_IPV6);
+				if (ctl->dest == NULL)
+					ctl->dest = *mp;
+				if (*mp)
+					mp = &(*mp)->m_next;
+				break;
+			}
+			case IPPROTO_ROUTING:
+			{
+				struct ip6_rthdr *prevrth = NULL;
+				int prevrhlen = 0;
+
+				if (!in6p->in6p_flags & IN6P_RTHDR)
+					break;
+
+				if (prevctl && prevctl->rthdr) {
+					cm = mtod(prevctl->rthdr,
+						  struct cmsghdr *);
+					prevrth = (struct ip6_rthdr *)CMSG_DATA(cm);
+					prevrhlen =
+						(prevrth->ip6r_len + 1) << 3;
+				}
+
+				/*
+				 * Check if the rthdr should be passed to
+				 * a user. See the comments for dstopt hdr.
+				 */
+				if (ctl->rthdr == NULL && prevrth &&
+				    prevrhlen == elen &&
+				    bcmp(ip6e, prevrth, elen) == 0)
+					break;
+
+				*mp = sbcreatecontrol((caddr_t)ip6e, elen,
+						      IS2292(IPV6_2292RTHDR,
+							     IPV6_RTHDR),
+						      IPPROTO_IPV6);
+				if (ctl->rthdr == NULL)
+					ctl->rthdr = *mp;
+				if (*mp)
+					mp = &(*mp)->m_next;
+				break;
+			}
+			case IPPROTO_HOPOPTS:
+			case IPPROTO_AH: /* is it possible? */
+				break;
+
+			default:
+				/*
+			 	 * other cases have been filtered in the above.
+				 * none will visit this case.  here we supply
+				 * the code just in case (nxt overwritten or
+				 * other cases).
+				 */
+#ifdef PULLDOWN_TEST
+				m_freem(ext);
+#endif
+				goto loopend;
+
+			}
+
+			/* proceed with the next header. */
+			off += elen;
+			nxt = ip6e->ip6e_nxt;
+			ip6e = NULL;
+#ifdef PULLDOWN_TEST
+			m_freem(ext);
+			ext = NULL;
+#endif
+		}
+	  loopend:
+		;
+	}
+
+#ifdef __bsdi__
+# undef sbcreatecontrol
+#endif
+#ifdef __OpenBSD__
+# undef in6p_flags
+#endif
+#undef IS2292
+}
+
+void
+ip6_notify_pmtu(in6p, dst, mtu)
+#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(HAVE_NRL_INPCB)
+	struct inpcb *in6p;
+#else
+	struct in6pcb *in6p;
+#endif
+	struct sockaddr_in6 *dst;
+	u_int32_t *mtu;
+{
+	struct socket *so;
+	struct mbuf *m_mtu;
+	struct ip6_mtuinfo mtuctl;
+#ifdef __bsdi__
+# define sbcreatecontrol	so_cmsg
+#endif
+
+#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(HAVE_NRL_INPCB)
+	so =  in6p->inp_socket;
+#else
+	so = in6p->in6p_socket;
+#endif
+
+	if (mtu == NULL)
+		return;
+
+#ifdef DIAGNOSTIC
+	if (so == NULL)		/* I believe this is impossible */
+		panic("ip6_notify_pmtu: socket is NULL");
+#endif
+
+	bzero(&mtuctl, sizeof(mtuctl));	/* zero-clear for safety */
+	mtuctl.ip6m_mtu = *mtu;
+	mtuctl.ip6m_addr = *dst;
+#ifndef SCOPEDROUTING
+	in6_recoverscope(&mtuctl.ip6m_addr, &mtuctl.ip6m_addr.sin6_addr, NULL);
+#endif
+
+	if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
+				     IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
+		return;
+
+	if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
+	    == 0) {
+		m_freem(m_mtu);
+		/* XXX: should count statistics */
+	} else
+		sorwakeup(so);
+
+	return;
+
+#ifdef __bsdi__
+# undef sbcreatecontrol
+#endif
+}
+
+#ifdef PULLDOWN_TEST
+/*
+ * pull single extension header from mbuf chain.  returns single mbuf that
+ * contains the result, or NULL on error.
+ */
+static struct mbuf *
+ip6_pullexthdr(m, off, nxt)
+	struct mbuf *m;
+	size_t off;
+	int nxt;
+{
+	struct ip6_ext ip6e;
+	size_t elen;
+	struct mbuf *n;
+
+#ifdef DIAGNOSTIC
+	switch (nxt) {
+	case IPPROTO_DSTOPTS:
+	case IPPROTO_ROUTING:
+	case IPPROTO_HOPOPTS:
+	case IPPROTO_AH: /* is it possible? */
+		break;
+	default:
+		printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
+	}
+#endif
+
+	m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
+	if (nxt == IPPROTO_AH)
+		elen = (ip6e.ip6e_len + 2) << 2;
+	else
+		elen = (ip6e.ip6e_len + 1) << 3;
+
+	MGET(n, M_DONTWAIT, MT_DATA);
+	if (n && elen >= MLEN) {
+		MCLGET(n, M_DONTWAIT);
+		if ((n->m_flags & M_EXT) == 0) {
+			m_free(n);
+			n = NULL;
+		}
+	}
+	if (!n)
+		return NULL;
+
+	n->m_len = 0;
+	if (elen >= M_TRAILINGSPACE(n)) {
+		m_free(n);
+		return NULL;
+	}
+
+	m_copydata(m, off, elen, mtod(n, caddr_t));
+	n->m_len = elen;
+	return n;
+}
+#endif
+
+/*
+ * Merge new IPv6 received options to previous ones.
+ * If a new option is not given, just re-link the option chain.
+ * If an old option exists but a corresponding new one doesn't, just
+ * keep the ole option.
+ * If a new option exists but a corresponding old one doesn't, just
+ * copy the new option.
+ * If both new and old options exist, free old one and overwrite the option
+ * with the new option.
+ * Otherwise, do nothing for the option.
+ * XXX: in any case, options that don't follow the recommend order and
+ *      number of extension headers (RFC 2460 Section 4.1) are simply ignored.
+ * XXX: We assume that each option is stored in a single mbuf.
+ */
+#define CLEAN_RECVOPT(old, type) \
+do {								\
+	if ((old)->type && (old)->type->m_next) {		\
+		(old)->type->m_next = NULL;			\
+	}							\
+} while (0)
+#define MERGE_RECVOPT(new, old, type) if ((new)->type) {\
+		if ((old)->type)\
+			m_free((old)->type);\
+		(old)->type = m_copy((new)->type, 0, (new)->type->m_len);\
+		if (((old)->type) && ((old)->type->m_next)) {\
+			m_freem((old)->type);\
+			old->type = NULL;\
+		}\
+	}
+#define LINK_RECVOPTS(opt, type, p) if ((opt)->type) {\
+		*(p) = (opt)->type;\
+		(p) = &(opt)->type->m_next;\
+	}
+
+static void dump_inputopts __P((char *, struct ip6_recvpktopts *));
+static void
+dump_inputopts(str, p)
+	char *str;
+	struct ip6_recvpktopts *p;
+{
+#if 1
+	return;
+#else
+#define PRINT1(p, name) \
+do { \
+	if (p->name) { \
+		printf(" %s: %p", #name, (p)->name); \
+		if (p->name->m_next) \
+			printf("[%p]", (p)->name->m_next); \
+	} \
+} while (0)
+
+	printf("%s p=%p head=%p", str, p, p->head);
+	PRINT1(p, hlim);
+	PRINT1(p, pktinfo);
+	PRINT1(p, hbh);
+	PRINT1(p, dest);
+	PRINT1(p, rthdr);
+	printf("\n");
+#undef PRINT1
+#endif
+}
+
+void
+ip6_update_recvpcbopt(old, new)
+	struct ip6_recvpktopts *new, *old;
+{
+	struct mbuf **mp;
+
+	if (old == NULL) {
+		printf("ip6_update_recvpcbopt: invalid arguments\n");
+		return;
+	}
+
+	dump_inputopts("old before", old);
+	if (new)
+		dump_inputopts("new before", new);
+
+#if 0
+	/*
+	 * cleanup m->m_next linkage. note that we do it in reverse order
+	 * to prevent possible memory leakage.
+	 */
+	old->head = NULL;
+	CLEAN_RECVOPT(old, rthdr);
+	CLEAN_RECVOPT(old, dest);
+	CLEAN_RECVOPT(old, hbh);
+	CLEAN_RECVOPT(old, pktinfo);
+	CLEAN_RECVOPT(old, hlim);
+#endif
+
+	if (new) {
+		MERGE_RECVOPT(new, old, hlim);
+		MERGE_RECVOPT(new, old, pktinfo);
+		MERGE_RECVOPT(new, old, hbh);
+		MERGE_RECVOPT(new, old, dest);
+		MERGE_RECVOPT(new, old, rthdr);
+	}
+
+	dump_inputopts("old middle", old);
+	if (new)
+		dump_inputopts("new middle", new);
+
+	/* link options */
+	mp = &old->head;
+	LINK_RECVOPTS(old, hlim, mp);
+	LINK_RECVOPTS(old, pktinfo, mp);
+	LINK_RECVOPTS(old, hbh, mp);
+	LINK_RECVOPTS(old, dest, mp);
+	LINK_RECVOPTS(old, rthdr, mp);
+	*mp = NULL;
+
+	dump_inputopts("old after", old);
+	if (new)
+		dump_inputopts("new after", new);
+}
+
+#undef MERGE_RECVOPT
+#undef LINK_RECVOPTS
+
+void
+ip6_reset_rcvopt(opts, optname)
+	struct ip6_recvpktopts *opts;
+	int optname;
+{
+	if (opts == NULL)
+		return;
+
+	switch (optname) {
+	case IPV6_RECVPKTINFO:
+		if (opts->pktinfo) m_free(opts->pktinfo);
+		opts->pktinfo = NULL;
+		break;
+	case IPV6_RECVHOPLIMIT:
+		if (opts->hlim) m_free(opts->hlim);
+		opts->hlim = NULL;
+		break;
+	case IPV6_RECVHOPOPTS:
+		if (opts->hbh) m_free(opts->hbh);
+		opts->hbh = NULL;
+		break;
+	case IPV6_RECVDSTOPTS:
+		if (opts->dest) m_free(opts->dest);
+		opts->dest = NULL;
+		break;
+	case IPV6_RECVRTHDR:
+		if (opts->rthdr) m_free(opts->rthdr);
+		opts->rthdr = NULL;
+		break;
+	default:
+		printf("ip6_reset_rcvopt: invalid option name (%d)\n",
+		       optname);
+		return;
+	}
+
+	ip6_update_recvpcbopt(opts, NULL); /* re-link the option chain */
+}
+
+/*
+ * Get pointer to the previous header followed by the header
+ * currently processed.
+ * XXX: This function supposes that
+ *	M includes all headers,
+ *	the next header field and the header length field of each header
+ *	are valid, and
+ *	the sum of each header length equals to OFF.
+ * Because of these assumptions, this function must be called very
+ * carefully. Moreover, it will not be used in the near future when
+ * we develop `neater' mechanism to process extension headers.
+ */
+char *
+ip6_get_prevhdr(m, off)
+	struct mbuf *m;
+	int off;
+{
+	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
+
+	if (off == sizeof(struct ip6_hdr))
+		return(&ip6->ip6_nxt);
+	else {
+		int len, nxt;
+		struct ip6_ext *ip6e = NULL;
+
+		nxt = ip6->ip6_nxt;
+		len = sizeof(struct ip6_hdr);
+		while (len < off) {
+			ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
+
+			switch (nxt) {
+			case IPPROTO_FRAGMENT:
+				len += sizeof(struct ip6_frag);
+				break;
+			case IPPROTO_AH:
+				len += (ip6e->ip6e_len + 2) << 2;
+				break;
+			default:
+				len += (ip6e->ip6e_len + 1) << 3;
+				break;
+			}
+			nxt = ip6e->ip6e_nxt;
+		}
+		if (ip6e)
+			return(&ip6e->ip6e_nxt);
+		else
+			return NULL;
+	}
+}
+
+/*
+ * get next header offset.  m will be retained.
+ */
+int
+ip6_nexthdr(m, off, proto, nxtp)
+	struct mbuf *m;
+	int off;
+	int proto;
+	int *nxtp;
+{
+	struct ip6_hdr ip6;
+	struct ip6_ext ip6e;
+	struct ip6_frag fh;
+
+	/* just in case */
+	if (m == NULL)
+		panic("ip6_nexthdr: m == NULL");
+	if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
+		return -1;
+
+	switch (proto) {
+	case IPPROTO_IPV6:
+		/* do not chase beyond intermediate IPv6 headers */
+		if (off != 0)
+			return -1;
+		if (m->m_pkthdr.len < off + sizeof(ip6))
+			return -1;
+		m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
+		if (nxtp)
+			*nxtp = ip6.ip6_nxt;
+		off += sizeof(ip6);
+		return off;
+
+	case IPPROTO_FRAGMENT:
+		/*
+		 * terminate parsing if it is not the first fragment,
+		 * it does not make sense to parse through it.
+		 */
+		if (m->m_pkthdr.len < off + sizeof(fh))
+			return -1;
+		m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
+		if ((ntohs(fh.ip6f_offlg) & IP6F_OFF_MASK) != 0)
+			return -1;
+		if (nxtp)
+			*nxtp = fh.ip6f_nxt;
+		off += sizeof(struct ip6_frag);
+		return off;
+
+	case IPPROTO_AH:
+		if (m->m_pkthdr.len < off + sizeof(ip6e))
+			return -1;
+		m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
+		if (nxtp)
+			*nxtp = ip6e.ip6e_nxt;
+		off += (ip6e.ip6e_len + 2) << 2;
+		if (m->m_pkthdr.len < off)
+			return -1;
+		return off;
+
+	case IPPROTO_HOPOPTS:
+	case IPPROTO_ROUTING:
+	case IPPROTO_DSTOPTS:
+		if (m->m_pkthdr.len < off + sizeof(ip6e))
+			return -1;
+		m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
+		if (nxtp)
+			*nxtp = ip6e.ip6e_nxt;
+		off += (ip6e.ip6e_len + 1) << 3;
+		if (m->m_pkthdr.len < off)
+			return -1;
+		return off;
+
+	case IPPROTO_NONE:
+	case IPPROTO_ESP:
+	case IPPROTO_IPCOMP:
+		/* give up */
+		return -1;
+
+	default:
+		return -1;
+	}
+
+	return -1;
+}
+
+/*
+ * get offset for the last header in the chain.  m will be kept untainted.
+ */
+int
+ip6_lasthdr(m, off, proto, nxtp)
+	struct mbuf *m;
+	int off;
+	int proto;
+	int *nxtp;
+{
+	int newoff;
+	int nxt;
+
+	if (!nxtp) {
+		nxt = -1;
+		nxtp = &nxt;
+	}
+	while (1) {
+		newoff = ip6_nexthdr(m, off, proto, nxtp);
+		if (newoff < 0)
+			return off;
+		else if (newoff < off)
+			return -1;	/* invalid */
+		else if (newoff == off)
+			return newoff;
+
+		off = newoff;
+		proto = *nxtp;
+	}
+}
+
+#if !(defined(__FreeBSD__) && __FreeBSD__ >= 4)
+void
+pfctlinput2(cmd, sa, ctlparam)
+	int cmd;
+	struct sockaddr *sa;
+	void *ctlparam;
+{
+	struct domain *dp;
+	struct protosw *pr;
+
+	if (!sa)
+		return;
+	for (dp = domains; dp; dp = dp->dom_next) {
+		/*
+		 * the check must be made by xx_ctlinput() anyways, to
+		 * make sure we use data item pointed to by ctlparam in
+		 * correct way.  the following check is made just for safety.
+		 */
+		if (dp->dom_family != sa->sa_family)
+			continue;
+
+		for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
+			if (pr->pr_ctlinput)
+				(*pr->pr_ctlinput)(cmd, sa, ctlparam);
+	}
+}
+#endif
+
+struct mbuf *
+ip6_addaux(m)
+	struct mbuf *m;
+{
+	struct mbuf *n;
+
+#ifdef DIAGNOSTIC
+	if (sizeof(struct ip6aux) > MHLEN)
+		panic("assumption failed on sizeof(ip6aux)");
+#endif
+	n = m_aux_find(m, AF_INET6, -1);
+	if (n) {
+		if (n->m_len < sizeof(struct ip6aux)) {
+			printf("conflicting use of ip6aux");
+			return NULL;
+		}
+	} else {
+		n = m_aux_add(m, AF_INET6, -1);
+		n->m_len = sizeof(struct ip6aux);
+		bzero(mtod(n, caddr_t), n->m_len);
+	}
+	return n;
+}
+
+struct mbuf *
+ip6_findaux(m)
+	struct mbuf *m;
+{
+	struct mbuf *n;
+
+	n = m_aux_find(m, AF_INET6, -1);
+	if (n && n->m_len < sizeof(struct ip6aux)) {
+		printf("conflicting use of ip6aux");
+		n = NULL;
+	}
+	return n;
+}
+
+void
+ip6_delaux(m)
+	struct mbuf *m;
+{
+	struct mbuf *n;
+
+	n = m_aux_find(m, AF_INET6, -1);
+	if (n)
+		m_aux_delete(m, n);
+}
+
+/*
+ * System control for IP6
+ */
+
+int inet6ctlerrmap[PRC_NCMDS] = {
+	0,		0,		0,		0,
+	0,		EMSGSIZE,	EHOSTDOWN,	EHOSTUNREACH,
+	EHOSTUNREACH,	EHOSTUNREACH,	ECONNREFUSED,	ECONNREFUSED,
+	EMSGSIZE,	EHOSTUNREACH,	0,		0,
+	0,		0,		0,		0,
+	ENOPROTOOPT
+};
+