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//==========================================================================
//
//      src/sys/netinet6/ip6_input.c
//
//==========================================================================
// ####BSDCOPYRIGHTBEGIN####                                    
// -------------------------------------------                  
// This file is part of eCos, the Embedded Configurable Operating System.
//
// Portions of this software may have been derived from FreeBSD 
// or other sources, and if so are covered by the appropriate copyright
// and license included herein.                                 
//
// Portions created by the Free Software Foundation are         
// Copyright (C) 2002 Free Software Foundation, Inc.            
// -------------------------------------------                  
// ####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;
 
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
}
 
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;
 
        /* 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);
 
        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((char*)&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((char*)&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
};
 
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[/] [openrisc/] [trunk/] [rtos/] [ecos-3.0/] [packages/] [net/] [bsd_tcpip/] [current/] [src/] [sys/] [netinet6/] [ip6_input.c] - Blame information for rev 786

Line No.	Rev	Author	Line
1	786	skrzyp	`//==========================================================================`
2			`//`
3			`// src/sys/netinet6/ip6_input.c`
4			`//`
5			`//==========================================================================`
6			`// ####BSDCOPYRIGHTBEGIN####`
7			`// -------------------------------------------`
8			`// This file is part of eCos, the Embedded Configurable Operating System.`
9			`//`
10			`// Portions of this software may have been derived from FreeBSD`
11			`// or other sources, and if so are covered by the appropriate copyright`
12			`// and license included herein.`
13			`//`
14			`// Portions created by the Free Software Foundation are`
15			`// Copyright (C) 2002 Free Software Foundation, Inc.`
16			`// -------------------------------------------`
17			`// ####BSDCOPYRIGHTEND####`
18			`//==========================================================================`
19
20			`/* $KAME: ip6_input.c,v 1.242 2001/12/27 17:40:10 jinmei Exp $ */`
21
22			`/*`
23			`* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.`
24			`* All rights reserved.`
25			`*`
26			`* Redistribution and use in source and binary forms, with or without`
27			`* modification, are permitted provided that the following conditions`
28			`* are met:`
29			`* 1. Redistributions of source code must retain the above copyright`
30			`* notice, this list of conditions and the following disclaimer.`
31			`* 2. Redistributions in binary form must reproduce the above copyright`
32			`* notice, this list of conditions and the following disclaimer in the`
33			`* documentation and/or other materials provided with the distribution.`
34			`* 3. Neither the name of the project nor the names of its contributors`
35			`* may be used to endorse or promote products derived from this software`
36			`* without specific prior written permission.`
37			`*`
38			* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
39			`* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE`
40			`* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE`