Skip site navigation (1)Skip section navigation (2)
Date:      Fri, 15 Sep 2006 06:02:38 +0600
From:      "Kamanashis Roy Shuva" <kamanashisroy@gmail.com>
To:        freebsd-net@freebsd.org
Subject:   Where is IPSec NAT-T support?
Message-ID:  <ce35fdf10609141702n7a1948acmcd66019834f410ac@mail.gmail.com>

next in thread | raw e-mail | index | archive | help
Hi,
  You have done a great jop. And I find this useful today. Problem is things
are not working fine.
  I have compiled freebsd with the patch
MD5 (freebsd6-natt.diff) = 81d535363981b5e84be77cbf26918ccc
for natt support. But I have problems both before and after compilation.
Note, as I tried uname I find
-------------------------------------
localhost# uname -v
FreeBSD 6.0-RELEASE #7: Thu Sep 14 19:28:39 GMT 2006     tapan@localhost
:/usr/obj/usr/src/sys/IPSEC
-------------------------------------
Again I  have the following line in my conf file for kernel
-------------------------------------
options         IPSEC
options         IPSEC_ESP
options         IPSEC_DEBUG
options         IPSEC_NAT_T
-------------------------------------
and I have not compiled with fast ipsec support
But there were two problems.
  1. I cannot compile the ipsec-tools with '--enable-natt=yes'. It checks
the presence of
natt support and it fals to find that. There in configure file I find a c
program
--------------------------------------
#define _KERNEL
#include <sys/types.h>
#include <net/pfkeyv2.h>
int
main ()
{
static struct sadb_x_nat_t_type ac_aggr;
if (ac_aggr.sadb_x_nat_t_type_len)
return 0;
  ;
  return 0;
}
--------------------------------------
I has some compilation error as,
--------------------------------------
storage size of 'ac_aggr' isn't known
--------------------------------------
But the following code compiles fine.
--------------------------------------
#define _KERNEL
#include <sys/types.h>
#include <net/pfkeyv2.h>

int
main ()
{
  static struct sadb_x_nat_t_type *ac_aggr;
  return 0;
}

--------------------------------------
  2. the patch failed for src/sys/netkey/key.c
and I have tried to do this manually ,
------------------------- key.c.orig ------------------
/*    $KAME: key.c,v 1.308 2003/09/07 20:35:59 itojun 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/netkey/key.c,v 1.71.2.1 2005/09/03 16:13:05 ume
Exp $");

/*
 * This code is referd to RFC 2367
 */

#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_var.h>

#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#endif /* INET6 */

#ifdef INET
#include <netinet/in_pcb.h>
#endif
#ifdef INET6
#include <netinet6/in6_pcb.h>
#endif /* INET6 */

#include <net/pfkeyv2.h>
#include <netkey/keydb.h>
#include <netkey/key.h>
#include <netkey/keysock.h>
#include <netkey/key_debug.h>

#include <netinet6/ipsec.h>
#ifdef INET6
#include <netinet6/ipsec6.h>
#endif
#include <netinet6/ah.h>
#ifdef INET6
#include <netinet6/ah6.h>
#endif
#ifdef IPSEC_ESP
#include <netinet6/esp.h>
#ifdef INET6
#include <netinet6/esp6.h>
#endif
#endif
#include <netinet6/ipcomp.h>
#ifdef INET6
#include <netinet6/ipcomp6.h>
#endif

#include <machine/stdarg.h>

/* randomness */
#include <sys/random.h>

#include <net/net_osdep.h>

#ifndef satosin
#define satosin(s) ((struct sockaddr_in *)s)
#endif

#define FULLMASK    0xff

/*
 * Note on SA reference counting:
 * - SAs that are not in DEAD state will have (total external reference + 1)
 *   following value in reference count field.  they cannot be freed and are
 *   referenced from SA header.
 * - SAs that are in DEAD state will have (total external reference)
 *   in reference count field.  they are ready to be freed.  reference from
 *   SA header will be removed in keydb_delsecasvar(), when the reference
count
 *   field hits 0 (= no external reference other than from SA header.
 */

u_int32_t key_debug_level = 0;
static u_int key_spi_trycnt = 1000;
static u_int32_t key_spi_minval = 0x100;
static u_int32_t key_spi_maxval = 0x0fffffff;    /* XXX */
static u_int key_larval_lifetime = 30;    /* interval to expire acquiring,
30(s)*/
static int key_blockacq_count = 10;    /* counter for blocking
SADB_ACQUIRE.*/
static int key_blockacq_lifetime = 20;    /* lifetime for blocking
SADB_ACQUIRE.*/
static int key_preferred_oldsa = 1;    /* preferred old sa rather than new
sa.*/

static u_int32_t acq_seq = 0;

struct _satailq satailq;        /* list of all SAD entry */
struct _sptailq sptailq;        /* SPD table + pcb */
static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX];    /* SPD table
*/
static LIST_HEAD(_sahtree, secashead) sahtree;            /* SAD */
static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1];
                            /* registed list */

#define SPIHASHSIZE    128
#define    SPIHASH(x)    (((x) ^ ((x) >> 16)) % SPIHASHSIZE)
static LIST_HEAD(_spihash, secasvar) spihash[SPIHASHSIZE];

#ifndef IPSEC_NONBLOCK_ACQUIRE
static LIST_HEAD(_acqtree, secacq) acqtree;        /* acquiring list */
#endif
static LIST_HEAD(_spacqtree, secspacq) spacqtree;    /* SP acquiring list */

struct key_cb key_cb;

/* search order for SAs */
static const u_int saorder_state_valid_prefer_old[] = {
    SADB_SASTATE_DYING, SADB_SASTATE_MATURE,
};
static const u_int saorder_state_valid_prefer_new[] = {
    SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
};
static const u_int saorder_state_alive[] = {
    /* except DEAD */
    SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL
};
static const u_int saorder_state_any[] = {
    SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
    SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD
};

static const int minsize[] = {
    sizeof(struct sadb_msg),    /* SADB_EXT_RESERVED */
    sizeof(struct sadb_sa),        /* SADB_EXT_SA */
    sizeof(struct sadb_lifetime),    /* SADB_EXT_LIFETIME_CURRENT */
    sizeof(struct sadb_lifetime),    /* SADB_EXT_LIFETIME_HARD */
    sizeof(struct sadb_lifetime),    /* SADB_EXT_LIFETIME_SOFT */
    sizeof(struct sadb_address),    /* SADB_EXT_ADDRESS_SRC */
    sizeof(struct sadb_address),    /* SADB_EXT_ADDRESS_DST */
    sizeof(struct sadb_address),    /* SADB_EXT_ADDRESS_PROXY */
    sizeof(struct sadb_key),    /* SADB_EXT_KEY_AUTH */
    sizeof(struct sadb_key),    /* SADB_EXT_KEY_ENCRYPT */
    sizeof(struct sadb_ident),    /* SADB_EXT_IDENTITY_SRC */
    sizeof(struct sadb_ident),    /* SADB_EXT_IDENTITY_DST */
    sizeof(struct sadb_sens),    /* SADB_EXT_SENSITIVITY */
    sizeof(struct sadb_prop),    /* SADB_EXT_PROPOSAL */
    sizeof(struct sadb_supported),    /* SADB_EXT_SUPPORTED_AUTH */
    sizeof(struct sadb_supported),    /* SADB_EXT_SUPPORTED_ENCRYPT */
    sizeof(struct sadb_spirange),    /* SADB_EXT_SPIRANGE */
    0,                /* SADB_X_EXT_KMPRIVATE */
    sizeof(struct sadb_x_policy),    /* SADB_X_EXT_POLICY */
    sizeof(struct sadb_x_sa2),    /* SADB_X_SA2 */
};
static const int maxsize[] = {
    sizeof(struct sadb_msg),    /* SADB_EXT_RESERVED */
    sizeof(struct sadb_sa),        /* SADB_EXT_SA */
    sizeof(struct sadb_lifetime),    /* SADB_EXT_LIFETIME_CURRENT */
    sizeof(struct sadb_lifetime),    /* SADB_EXT_LIFETIME_HARD */
    sizeof(struct sadb_lifetime),    /* SADB_EXT_LIFETIME_SOFT */
    0,                /* SADB_EXT_ADDRESS_SRC */
    0,                /* SADB_EXT_ADDRESS_DST */
    0,                /* SADB_EXT_ADDRESS_PROXY */
    0,                /* SADB_EXT_KEY_AUTH */
    0,                /* SADB_EXT_KEY_ENCRYPT */
    0,                /* SADB_EXT_IDENTITY_SRC */
    0,                /* SADB_EXT_IDENTITY_DST */
    0,                /* SADB_EXT_SENSITIVITY */
    0,                /* SADB_EXT_PROPOSAL */
    0,                /* SADB_EXT_SUPPORTED_AUTH */
    0,                /* SADB_EXT_SUPPORTED_ENCRYPT */
    sizeof(struct sadb_spirange),    /* SADB_EXT_SPIRANGE */
    0,                /* SADB_X_EXT_KMPRIVATE */
    0,                /* SADB_X_EXT_POLICY */
    sizeof(struct sadb_x_sa2),    /* SADB_X_SA2 */
};

static int ipsec_esp_keymin = 256;
#ifdef IPSEC_ESP
static int ipsec_esp_auth = 0;
#endif
static int ipsec_ah_keymin = 128;

SYSCTL_DECL(_net_key);

SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL,    debug,    CTLFLAG_RW, \
    &key_debug_level,    0,    "");

/* max count of trial for the decision of spi value */
SYSCTL_INT(_net_key, KEYCTL_SPI_TRY,        spi_trycnt,    CTLFLAG_RW, \
    &key_spi_trycnt,    0,    "");

/* minimum spi value to allocate automatically. */
SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE,    spi_minval,    CTLFLAG_RW, \
    &key_spi_minval,    0,    "");

/* maximun spi value to allocate automatically. */
SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE,    spi_maxval,    CTLFLAG_RW, \
    &key_spi_maxval,    0,    "");

/* lifetime for larval SA */
SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME,    larval_lifetime, CTLFLAG_RW,
\
    &key_larval_lifetime,    0,    "");

/* counter for blocking to send SADB_ACQUIRE to IKEd */
SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT,    blockacq_count,
CTLFLAG_RW, \
    &key_blockacq_count,    0,    "");

/* lifetime for blocking to send SADB_ACQUIRE to IKEd */
SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME,    blockacq_lifetime,
CTLFLAG_RW, \
    &key_blockacq_lifetime,    0,    "");

#ifdef IPSEC_ESP
/* ESP auth */
SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH,    esp_auth, CTLFLAG_RW, \
    &ipsec_esp_auth,    0,    "ESP auth");
#endif

/* minimum ESP key length */
SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN,    esp_keymin, CTLFLAG_RW, \
    &ipsec_esp_keymin,    0,    "");

/* minimum AH key length */
SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN,    ah_keymin, CTLFLAG_RW, \
    &ipsec_ah_keymin,    0,    "");

/* perfered old SA rather than new SA */
SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA,    preferred_oldsa, CTLFLAG_RW,\
    &key_preferred_oldsa,    0,    "");

#define __LIST_CHAINED(elm) \
    (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
#define LIST_INSERT_TAIL(head, elm, type, field) \
do {\
    struct type *curelm = LIST_FIRST(head); \
    if (curelm == NULL) {\
        LIST_INSERT_HEAD(head, elm, field); \
    } else { \
        while (LIST_NEXT(curelm, field)) \
            curelm = LIST_NEXT(curelm, field);\
        LIST_INSERT_AFTER(curelm, elm, field);\
    }\
} while (/*CONSTCOND*/ 0)

#define KEY_CHKSASTATE(head, sav, name) \
do { \
    if ((head) != (sav)) {                        \
        ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%u SA=%u)\n", \
            (name), (head), (sav)));            \
        continue;                        \
    }                                \
} while (/*CONSTCOND*/ 0)

#define KEY_CHKSPDIR(head, sp, name) \
do { \
    if ((head) != (sp)) {                        \
        ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%u SP=%u), " \
            "anyway continue.\n",                \
            (name), (head), (sp)));                \
    }                                \
} while (/*CONSTCOND*/ 0)

#if 1
#define KMALLOC(p, t, n)
\
    ((p) = (t) malloc((unsigned long)(n), M_SECA, M_NOWAIT))
#define KFREE(p)
\
    free((caddr_t)(p), M_SECA)
#else
#define KMALLOC(p, t, n) \
do { \
    ((p) = (t)malloc((unsigned long)(n), M_SECA, M_NOWAIT));             \
    printf("%s %d: %p <- KMALLOC(%s, %d)\n",                             \
        __FILE__, __LINE__, (p), #t, n);                             \
} while (/*CONSTCOND*/ 0)

#define KFREE(p)
\
    do {                                                                 \
        printf("%s %d: %p -> KFREE()\n", __FILE__, __LINE__, (p));   \
        free((caddr_t)(p), M_SECA);                                  \
    } while (/*CONSTCOND*/ 0)
#endif

/*
 * set parameters into secpolicyindex buffer.
 * Must allocate secpolicyindex buffer passed to this function.
 */
#define KEY_SETSECSPIDX(s, d, ps, pd, ulp, idx) \
do { \
    bzero((idx), sizeof(struct secpolicyindex));
\
    (idx)->prefs = (ps);                                                 \
    (idx)->prefd = (pd);                                                 \
    (idx)->ul_proto = (ulp);                                             \
    bcopy((s), &(idx)->src, ((struct sockaddr *)(s))->sa_len);           \
    bcopy((d), &(idx)->dst, ((struct sockaddr *)(d))->sa_len);           \
} while (/*CONSTCOND*/ 0)

/*
 * set parameters into secasindex buffer.
 * Must allocate secasindex buffer before calling this function.
 */
#define KEY_SETSECASIDX(p, m, r, s, d, idx) \
do { \
    bzero((idx), sizeof(struct secasindex));                             \
    (idx)->proto = (p);                                                  \
    (idx)->mode = (m);                                                   \
    (idx)->reqid = (r);                                                  \
    bcopy((s), &(idx)->src, ((struct sockaddr *)(s))->sa_len);           \
    bcopy((d), &(idx)->dst, ((struct sockaddr *)(d))->sa_len);           \
} while (/*CONSTCOND*/ 0)

/* key statistics */
struct _keystat {
    u_long getspi_count; /* the avarage of count to try to get new SPI */
} keystat;

struct sadb_msghdr {
    struct sadb_msg *msg;
    struct sadb_ext *ext[SADB_EXT_MAX + 1];
    int extoff[SADB_EXT_MAX + 1];
    int extlen[SADB_EXT_MAX + 1];
};

static struct secasvar *key_allocsa_policy(struct secasindex *);
static struct secasvar *key_do_allocsa_policy(struct secashead *, u_int);
static void key_delsav(struct secasvar *);
static void key_delsp(struct secpolicy *);
static struct secpolicy *key_getsp(struct secpolicyindex *, int);
static struct secpolicy *key_getspbyid(u_int32_t);
static u_int32_t key_newreqid(void);
static struct mbuf *key_gather_mbuf(struct mbuf *,
    const struct sadb_msghdr *, int, int, ...);
static int key_spdadd(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_spddelete(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_spddelete2(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_spdget(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_spdflush(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_spddump(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static struct mbuf *key_setdumpsp(struct secpolicy *,
    u_int8_t, u_int32_t, u_int32_t);
static u_int key_getspreqmsglen(struct secpolicy *);
static int key_spdexpire(struct secpolicy *);
static struct secashead *key_newsah(struct secasindex *);
static void key_delsah(struct secashead *);
static struct secasvar *key_newsav(struct mbuf *,
    const struct sadb_msghdr *, struct secashead *, int *);
static struct secashead *key_getsah(struct secasindex *);
static struct secasvar *key_checkspidup(struct secasindex *, u_int32_t);
static void key_setspi(struct secasvar *, u_int32_t);
static struct secasvar *key_getsavbyspi(struct secashead *, u_int32_t);
static int key_setsaval(struct secasvar *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_mature(struct secasvar *);
static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t,
    u_int8_t, u_int32_t, u_int32_t);
static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t,
    u_int32_t, pid_t, u_int16_t);
static struct mbuf *key_setsadbsa(struct secasvar *);
static struct mbuf *key_setsadbaddr(u_int16_t,
    struct sockaddr *, u_int8_t, u_int16_t);
#if 0
static struct mbuf *key_setsadbident(u_int16_t, u_int16_t, caddr_t,
    int, u_int64_t);
#endif
static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t);
static struct mbuf *key_setsadblifetime(u_int16_t, u_int32_t,
    u_int64_t, u_int64_t, u_int64_t);
static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t,
    u_int32_t);
static void *key_newbuf(const void *, u_int);
static int key_ismyaddr(struct sockaddr *);
#ifdef INET6
static int key_ismyaddr6(struct sockaddr_in6 *);
#endif

/* flags for key_cmpsaidx() */
#define CMP_HEAD    1    /* protocol, addresses. */
#define CMP_MODE_REQID    2    /* additionally HEAD, reqid, mode. */
#define CMP_REQID    3    /* additionally HEAD, reqid. not used */
#define CMP_EXACTLY    4    /* all elements. */
static int key_cmpsaidx(struct secasindex *, struct secasindex *, int);

static int key_sockaddrcmp(struct sockaddr *, struct sockaddr *, int);
static int key_bbcmp(caddr_t, caddr_t, u_int);
static u_long key_random(void);
static u_int16_t key_satype2proto(u_int8_t);
static u_int8_t key_proto2satype(u_int16_t);

static int key_getspi(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static u_int32_t key_do_getnewspi(struct sadb_spirange *,
                    struct secasindex *);
static int key_update(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
#ifdef IPSEC_DOSEQCHECK
static struct secasvar *key_getsavbyseq(struct secashead *, u_int32_t);
#endif
static int key_add(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_setident(struct secashead *, struct mbuf *,
    const struct sadb_msghdr *);
static struct mbuf *key_getmsgbuf_x1(struct mbuf *,
    const struct sadb_msghdr *);
static int key_delete(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_get(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);

static void key_getcomb_setlifetime(struct sadb_comb *);
#ifdef IPSEC_ESP
static struct mbuf *key_getcomb_esp(void);
#endif
static struct mbuf *key_getcomb_ah(void);
static struct mbuf *key_getcomb_ipcomp(void);
static struct mbuf *key_getprop(const struct secasindex *);

static int key_acquire(struct secasindex *, struct secpolicy *);
#ifndef IPSEC_NONBLOCK_ACQUIRE
static struct secacq *key_newacq(struct secasindex *);
static struct secacq *key_getacq(struct secasindex *);
static struct secacq *key_getacqbyseq(u_int32_t);
#endif
static struct secspacq *key_newspacq(struct secpolicyindex *);
static struct secspacq *key_getspacq(struct secpolicyindex *);
static int key_acquire2(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_register(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_expire(struct secasvar *);
static int key_flush(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_dump(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_promisc(struct socket *, struct mbuf *,
    const struct sadb_msghdr *);
static int key_senderror(struct socket *, struct mbuf *, int);
static int key_validate_ext(struct sadb_ext *, int);
static int key_align(struct mbuf *, struct sadb_msghdr *);
#if 0
static const char *key_getfqdn(void);
static const char *key_getuserfqdn(void);
#endif
static void key_sa_chgstate(struct secasvar *, u_int8_t);
static void key_sp_dead(struct secpolicy *);
static void key_sp_unlink(struct secpolicy *);
static struct mbuf *key_alloc_mbuf(int);
static struct callout key_timehandler_ch;

/* %%% IPsec policy management */
/*
 * allocating a SP for OUTBOUND or INBOUND packet.
 * Must call key_freesp() later.
 * OUT:    NULL:    not found
 *    others:    found and return the pointer.
 */
struct secpolicy *
key_allocsp(tag, spidx, dir)
    u_int16_t tag;
    struct secpolicyindex *spidx;
    u_int dir;
{
    struct secpolicy *sp;
    int s;

    /* check direction */
    switch (dir) {
    case IPSEC_DIR_INBOUND:
    case IPSEC_DIR_OUTBOUND:
        break;
    default:
        panic("key_allocsp: Invalid direction is passed.");
    }

    /* get a SP entry */
    s = splnet();    /*called from softclock()*/
    if (spidx) {
        KEYDEBUG(KEYDEBUG_IPSEC_DATA,
            printf("*** objects\n");
            kdebug_secpolicyindex(spidx));
    }

    LIST_FOREACH(sp, &sptree[dir], chain) {
        if (sp->state == IPSEC_SPSTATE_DEAD)
            continue;
        if (sp->spidx) {
            if (!spidx)
                continue;

            KEYDEBUG(KEYDEBUG_IPSEC_DATA,
                printf("*** in SPD\n");
                kdebug_secpolicyindex(sp->spidx));

            if (key_cmpspidx_withmask(sp->spidx, spidx))
                goto found;
        }
    }

    splx(s);
    return NULL;

found:
    /* sanity check */
    KEY_CHKSPDIR(sp->dir, dir, "key_allocsp");

    /* found a SPD entry */
    sp->lastused = time_second;
    sp->refcnt++;
    splx(s);
    KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
        printf("DP key_allocsp cause refcnt++:%d SP:%p\n",
            sp->refcnt, sp));

    return sp;
}

/*
 * return a policy that matches this particular inbound packet.
 * XXX slow
 */
struct secpolicy *
key_gettunnel(osrc, odst, isrc, idst)
    struct sockaddr *osrc, *odst, *isrc, *idst;
{
    struct secpolicy *sp;
    const int dir = IPSEC_DIR_INBOUND;
    int s;
    struct ipsecrequest *r1, *r2, *p;
    struct sockaddr *os, *od, *is, *id;
    struct secpolicyindex spidx;

    if (isrc->sa_family != idst->sa_family) {
        ipseclog((LOG_ERR, "protocol family mismatched %u != %u\n",
            isrc->sa_family, idst->sa_family));
        return NULL;
    }

    s = splnet();    /*called from softclock()*/
    LIST_FOREACH(sp, &sptree[dir], chain) {
        if (sp->state == IPSEC_SPSTATE_DEAD)
            continue;

        r1 = r2 = NULL;
        for (p = sp->req; p; p = p->next) {
            if (p->saidx.mode != IPSEC_MODE_TUNNEL)
                continue;

            r1 = r2;
            r2 = p;

            if (!r1) {
                if (sp->spidx) {
                    /*
                     * here we look at address matches
                     * only
                     */
                    spidx = *sp->spidx;
                    if (isrc->sa_len > sizeof(spidx.src) ||
                        idst->sa_len > sizeof(spidx.dst))
                        continue;
                    bcopy(isrc, &spidx.src, isrc->sa_len);
                    bcopy(idst, &spidx.dst, idst->sa_len);
                    if (!key_cmpspidx_withmask(sp->spidx,
                        &spidx))
                        continue;
                } else
                    ; /* can't check for tagged policy */
            } else {
                is = (struct sockaddr *)&r1->saidx.src;
                id = (struct sockaddr *)&r1->saidx.dst;
                if (key_sockaddrcmp(is, isrc, 0) ||
                    key_sockaddrcmp(id, idst, 0))
                    continue;
            }

            os = (struct sockaddr *)&r2->saidx.src;
            od = (struct sockaddr *)&r2->saidx.dst;
            if (key_sockaddrcmp(os, osrc, 0) ||
                key_sockaddrcmp(od, odst, 0))
                continue;

            goto found;
        }
    }
    splx(s);
    return NULL;

found:
    sp->lastused = time_second;
    sp->refcnt++;
    splx(s);
    return sp;
}

/*
 * allocating an SA entry for an *OUTBOUND* packet.
 * checking each request entries in SP, and acquire an SA if need.
 * OUT:    0: there are valid requests.
 *    ENOENT: policy may be valid, but SA with REQUIRE is on acquiring.
 */
int
key_checkrequest(isr, saidx)
    struct ipsecrequest *isr;
    struct secasindex *saidx;
{
    u_int level;
    int error;

    /* sanity check */
    if (isr == NULL || saidx == NULL)
        panic("key_checkrequest: NULL pointer is passed.");

    /* check mode */
    switch (saidx->mode) {
    case IPSEC_MODE_TRANSPORT:
    case IPSEC_MODE_TUNNEL:
        break;
    case IPSEC_MODE_ANY:
    default:
        panic("key_checkrequest: Invalid policy defined.");
    }

    /* get current level */
    level = ipsec_get_reqlevel(isr, saidx->src.ss_family);

#if 0
    /*
     * We do allocate new SA only if the state of SA in the holder is
     * SADB_SASTATE_DEAD.  The SA for outbound must be the oldest.
     */
    if (isr->sav != NULL) {
        if (isr->sav->sah == NULL)
            panic("key_checkrequest: sah is null.");
        if (isr->sav ==
            LIST_FIRST(&isr->sav->sah->savtree[SADB_SASTATE_DEAD])) {
            KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
                printf("DP checkrequest calls free SA:%p\n",
                    isr->sav));
            key_freesav(isr->sav);
            isr->sav = NULL;
        }
    }
#else
    /*
     * we free any SA stashed in the IPsec request because a different
     * SA may be involved each time this request is checked, either
     * because new SAs are being configured, or this request is
     * associated with an unconnected datagram socket, or this request
     * is associated with a system default policy.
     *
     * The operation may have negative impact to performance.  We may
     * want to check cached SA carefully, rather than picking new SA
     * every time.
     */
    if (isr->sav != NULL) {
        key_freesav(isr->sav);
        isr->sav = NULL;
    }
#endif

    /*
     * new SA allocation if no SA found.
     * key_allocsa_policy should allocate the oldest SA available.
     * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt.
     */
    if (isr->sav == NULL)
        isr->sav = key_allocsa_policy(saidx);

    /* When there is SA. */
    if (isr->sav != NULL)
        return 0;

    /* there is no SA */
    if ((error = key_acquire(saidx, isr->sp)) != 0) {
        /* XXX What should I do ? */
        ipseclog((LOG_DEBUG, "key_checkrequest: error %d returned "
            "from key_acquire.\n", error));
        return error;
    }

    return level == IPSEC_LEVEL_REQUIRE ? ENOENT : 0;
}

/*
 * allocating a SA for policy entry from SAD.
 * NOTE: searching SAD of aliving state.
 * OUT:    NULL:    not found.
 *    others:    found and return the pointer.
 */
static struct secasvar *
key_allocsa_policy(saidx)
    struct secasindex *saidx;
{
    struct secashead *sah;
    struct secasvar *sav;
    u_int stateidx, state;
    const u_int *saorder_state_valid;
    int arraysize;

    LIST_FOREACH(sah, &sahtree, chain) {
        if (sah->state == SADB_SASTATE_DEAD)
            continue;
        if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
            goto found;
    }

    return NULL;

    found:

    /*
     * search a valid state list for outbound packet.
     * This search order is important.
     */
    if (key_preferred_oldsa) {
        saorder_state_valid = saorder_state_valid_prefer_old;
        arraysize = _ARRAYLEN(saorder_state_valid_prefer_old);
    } else {
        saorder_state_valid = saorder_state_valid_prefer_new;
        arraysize = _ARRAYLEN(saorder_state_valid_prefer_new);
    }

    for (stateidx = 0; stateidx < arraysize; stateidx++) {

        state = saorder_state_valid[stateidx];

        sav = key_do_allocsa_policy(sah, state);
        if (sav != NULL)
            return sav;
    }

    return NULL;
}

/*
 * searching SAD with direction, protocol, mode and state.
 * called by key_allocsa_policy().
 * OUT:
 *    NULL    : not found
 *    others    : found, pointer to a SA.
 */
static struct secasvar *
key_do_allocsa_policy(sah, state)
    struct secashead *sah;
    u_int state;
{
    struct secasvar *sav, *nextsav, *candidate, *d;

    /* initilize */
    candidate = NULL;

    for (sav = LIST_FIRST(&sah->savtree[state]);
         sav != NULL;
         sav = nextsav) {

        nextsav = LIST_NEXT(sav, chain);

        /* sanity check */
        KEY_CHKSASTATE(sav->state, state, "key_do_allocsa_policy");

        /* initialize */
        if (candidate == NULL) {
            candidate = sav;
            continue;
        }

        /* Which SA is the better ? */

        /* sanity check 2 */
        if (candidate->lft_c == NULL || sav->lft_c == NULL)
            panic("key_do_allocsa_policy: "
                "lifetime_current is NULL.");

        /* What the best method is to compare ? */
        if (key_preferred_oldsa) {
            if (candidate->lft_c->sadb_lifetime_addtime >
                    sav->lft_c->sadb_lifetime_addtime) {
                candidate = sav;
            }
            continue;
            /*NOTREACHED*/
        }

        /* preferred new sa rather than old sa */
        if (candidate->lft_c->sadb_lifetime_addtime <
                sav->lft_c->sadb_lifetime_addtime) {
            d = candidate;
            candidate = sav;
        } else
            d = sav;

        /*
         * prepared to delete the SA when there is more
         * suitable candidate and the lifetime of the SA is not
         * permanent.
         */
        if (d->lft_c->sadb_lifetime_addtime != 0) {
            struct mbuf *m, *result = NULL;

            key_sa_chgstate(d, SADB_SASTATE_DEAD);

            m = key_setsadbmsg(SADB_DELETE, 0,
                key_proto2satype(d->sah->saidx.proto),
                0, 0, d->refcnt - 1);
            if (!m)
                goto msgfail;
            result = m;

            /* set sadb_address for saidx's. */
            m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
                (struct sockaddr *)&d->sah->saidx.src,
                FULLMASK, IPSEC_ULPROTO_ANY);
            if (!m)
                goto msgfail;
            m_cat(result, m);

            /* set sadb_address for saidx's. */
            m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
                (struct sockaddr *)&d->sah->saidx.dst,
                FULLMASK, IPSEC_ULPROTO_ANY);
            if (!m)
                goto msgfail;
            m_cat(result, m);

            /* create SA extension */
            m = key_setsadbsa(d);
            if (!m)
                goto msgfail;
            m_cat(result, m);

            if (result->m_len < sizeof(struct sadb_msg)) {
                result = m_pullup(result,
                        sizeof(struct sadb_msg));
                if (result == NULL)
                    goto msgfail;
            }

            result->m_pkthdr.len = 0;
            for (m = result; m; m = m->m_next)
                result->m_pkthdr.len += m->m_len;
            mtod(result, struct sadb_msg *)->sadb_msg_len =
                PFKEY_UNIT64(result->m_pkthdr.len);

            if (key_sendup_mbuf(NULL, result,
                    KEY_SENDUP_REGISTERED))
                goto msgfail;

            result = NULL;

         msgfail:
            if (result != NULL)
                m_freem(result);
            key_freesav(d);
        }
    }

    if (candidate) {
        candidate->refcnt++;
        KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
            printf("DP allocsa_policy cause "
                "refcnt++:%d SA:%p\n",
                candidate->refcnt, candidate));
    }
    return candidate;
}

/*
 * allocating a SA entry for a *INBOUND* packet.
 * Must call key_freesav() later.
 * OUT: positive:    pointer to a sav.
 *    NULL:        not found, or error occured.
 *
 * In the comparison, source address will be ignored for RFC2401
conformance.
 * To quote, from section 4.1:
 *    A security association is uniquely identified by a triple consisting
 *    of a Security Parameter Index (SPI), an IP Destination Address, and a
 *    security protocol (AH or ESP) identifier.
 * Note that, however, we do need to keep source address in IPsec SA.
 * IKE specification and PF_KEY specification do assume that we
 * keep source address in IPsec SA.  We see a tricky situation here.
 */
struct secasvar *
key_allocsa(family, src, dst, proto, spi)
    u_int family, proto;
    caddr_t src, dst;
    u_int32_t spi;
{
    struct secasvar *sav, *match;
    u_int stateidx, state, tmpidx, matchidx;
    struct sockaddr_in sin;
    struct sockaddr_in6 sin6;
    int s;
    const u_int *saorder_state_valid;
    int arraysize;

    /* sanity check */
    if (src == NULL || dst == NULL)
        panic("key_allocsa: NULL pointer is passed.");

    /*
     * when both systems employ similar strategy to use a SA.
     * the search order is important even in the inbound case.
     */
    if (key_preferred_oldsa) {
        saorder_state_valid = saorder_state_valid_prefer_old;
        arraysize = _ARRAYLEN(saorder_state_valid_prefer_old);
    } else {
        saorder_state_valid = saorder_state_valid_prefer_new;
        arraysize = _ARRAYLEN(saorder_state_valid_prefer_new);
    }

    /*
     * searching SAD.
     * XXX: to be checked internal IP header somewhere.  Also when
     * IPsec tunnel packet is received.  But ESP tunnel mode is
     * encrypted so we can't check internal IP header.
     */
    s = splnet();    /*called from softclock()*/
    /*
     * search a valid state list for inbound packet.
     * the search order is not important.
     */
    match = NULL;
    matchidx = arraysize;
    LIST_FOREACH(sav, &spihash[SPIHASH(spi)], spihash) {
        if (sav->spi != spi)
            continue;
        if (proto != sav->sah->saidx.proto)
            continue;
        if (family != sav->sah->saidx.src.ss_family ||
            family != sav->sah->saidx.dst.ss_family)
            continue;
        tmpidx = arraysize;
        for (stateidx = 0; stateidx < matchidx; stateidx++) {
            state = saorder_state_valid[stateidx];
            if (sav->state == state) {
                tmpidx = stateidx;
                break;
            }
        }
        if (tmpidx >= matchidx)
            continue;

#if 0    /* don't check src */
        /* check src address */
        switch (family) {
        case AF_INET:
            bzero(&sin, sizeof(sin));
            sin.sin_family = AF_INET;
            sin.sin_len = sizeof(sin);
            bcopy(src, &sin.sin_addr,
                sizeof(sin.sin_addr));
            if (key_sockaddrcmp((struct sockaddr*)&sin,
                (struct sockaddr *)&sav->sah->saidx.src, 0) != 0)
                continue;

            break;
        case AF_INET6:
            bzero(&sin6, sizeof(sin6));
            sin6.sin6_family = AF_INET6;
            sin6.sin6_len = sizeof(sin6);
            bcopy(src, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
            if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) {
                /* kame fake scopeid */
                sin6.sin6_scope_id =
                    ntohs(sin6.sin6_addr.s6_addr16[1]);
                sin6.sin6_addr.s6_addr16[1] = 0;
            }
            if (key_sockaddrcmp((struct sockaddr *)&sin6,
                (struct sockaddr *)&sav->sah->saidx.src, 0) != 0)
                continue;
            break;
        default:
            ipseclog((LOG_DEBUG, "key_allocsa: "
                "unknown address family=%d.\n",
                family));
            continue;
        }

#endif
        /* check dst address */
        switch (family) {
        case AF_INET:
            bzero(&sin, sizeof(sin));
            sin.sin_family = AF_INET;
            sin.sin_len = sizeof(sin);
            bcopy(dst, &sin.sin_addr,
                sizeof(sin.sin_addr));
            if (key_sockaddrcmp((struct sockaddr*)&sin,
                (struct sockaddr *)&sav->sah->saidx.dst, 0) != 0)
                continue;

            break;
        case AF_INET6:
            bzero(&sin6, sizeof(sin6));
            sin6.sin6_family = AF_INET6;
            sin6.sin6_len = sizeof(sin6);
            bcopy(dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
            if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) {
                /* kame fake scopeid */
                sin6.sin6_scope_id =
                    ntohs(sin6.sin6_addr.s6_addr16[1]);
                sin6.sin6_addr.s6_addr16[1] = 0;
            }
            if (key_sockaddrcmp((struct sockaddr *)&sin6,
                (struct sockaddr *)&sav->sah->saidx.dst, 0) != 0)
                continue;
            break;
        default:
            ipseclog((LOG_DEBUG, "key_allocsa: "
                "unknown address family=%d.\n", family));
            continue;
        }

        match = sav;
        matchidx = tmpidx;
    }

    if (match)
        goto found;

    /* not found */
    splx(s);
    return NULL;

found:
    match->refcnt++;
    splx(s);
    KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
        printf("DP allocsa cause refcnt++:%d SA:%p\n",
            match->refcnt, match));
    return match;
}

/*
 * Must be called after calling key_allocsp().
 * For both the packet without socket and key_freeso().
 */
void
key_freesp(sp)
    struct secpolicy *sp;
{
    /* sanity check */
    if (sp == NULL)
        panic("key_freesp: NULL pointer is passed.");

    sp->refcnt--;
    KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
        printf("DP freesp cause refcnt--:%d SP:%p\n",
            sp->refcnt, sp));

    if (sp->refcnt == 0)
        key_delsp(sp);

    return;
}

/*
 * Must be called after calling key_allocsa().
 * This function is called by key_freesp() to free some SA allocated
 * for a policy.
 */
void
key_freesav(sav)
    struct secasvar *sav;
{
    /* sanity check */
    if (sav == NULL)
        panic("key_freesav: NULL pointer is passed.");

    sav->refcnt--;
    KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
        printf("DP freesav cause refcnt--:%d SA:%p SPI %u\n",
            sav->refcnt, sav, (u_int32_t)ntohl(sav->spi)));

    if (sav->refcnt > 0)
        return;

    key_delsav(sav);
}

static void
key_delsav(sav)
    struct secasvar *sav;
{
    int s;

    /* sanity check */
    if (sav == NULL)
        panic("key_delsav: NULL pointer is passed.");

    if (sav->refcnt > 0)
        panic("key_delsav: called with positive refcnt");

    s = splnet();

    if (__LIST_CHAINED(sav))
        LIST_REMOVE(sav, chain);

    if (sav->spihash.le_prev || sav->spihash.le_next)
        LIST_REMOVE(sav, spihash);

    if (sav->key_auth != NULL) {
        bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
        KFREE(sav->key_auth);
        sav->key_auth = NULL;
    }
    if (sav->key_enc != NULL) {
        bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc));
        KFREE(sav->key_enc);
        sav->key_enc = NULL;
    }
    if (sav->sched) {
        bzero(sav->sched, sav->schedlen);
        KFREE(sav->sched);
        sav->sched = NULL;
    }
    if (sav->replay != NULL) {
        keydb_delsecreplay(sav->replay);
        sav->replay = NULL;
    }
    if (sav->lft_c != NULL) {
        KFREE(sav->lft_c);
        sav->lft_c = NULL;
    }
    if (sav->lft_h != NULL) {
        KFREE(sav->lft_h);
        sav->lft_h = NULL;
    }
    if (sav->lft_s != NULL) {
        KFREE(sav->lft_s);
        sav->lft_s = NULL;
    }
    if (sav->iv != NULL) {
        KFREE(sav->iv);
        sav->iv = NULL;
    }

    keydb_delsecasvar(sav);

    splx(s);
}

/* %%% SPD management */
/*
 * free security policy entry.
 */
static void
key_delsp(sp)
    struct secpolicy *sp;
{
    int s;

    /* sanity check */
    if (sp == NULL)
        panic("key_delsp: NULL pointer is passed.");

    if (sp->refcnt > 0)
        panic("key_delsp: called with positive refcnt");

    s = splnet();    /*called from softclock()*/

    {
    struct ipsecrequest *isr = sp->req, *nextisr;

    while (isr != NULL) {
        if (isr->sav != NULL) {
            KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
                printf("DP delsp calls free SA:%p\n",
                    isr->sav));
            key_freesav(isr->sav);
            isr->sav = NULL;
        }

        nextisr = isr->next;
        KFREE(isr);
        isr = nextisr;
    }
    }

    keydb_delsecpolicy(sp);

    splx(s);

    return;
}

/*
 * search SPD
 * OUT:    NULL    : not found
 *    others    : found, pointer to a SP.
 */
static struct secpolicy *
key_getsp(spidx, dir)
    struct secpolicyindex *spidx;
    int dir;
{
    struct secpolicy *sp;

    /* sanity check */
    if (spidx == NULL)
        panic("key_getsp: NULL pointer is passed.");

    LIST_FOREACH(sp, &sptree[dir], chain) {
        if (sp->state == IPSEC_SPSTATE_DEAD)
            continue;
        if (!sp->spidx)
            continue;
        if (key_cmpspidx_exactly(spidx, sp->spidx)) {
            sp->refcnt++;
            return sp;
        }
    }

    return NULL;
}

/*
 * get SP by index.
 * OUT:    NULL    : not found
 *    others    : found, pointer to a SP.
 */
static struct secpolicy *
key_getspbyid(id)
    u_int32_t id;
{
    struct secpolicy *sp;

    TAILQ_FOREACH(sp, &sptailq, tailq) {
        if (sp->id == id) {
            sp->refcnt++;
            return sp;
        }
    }

    return NULL;
}

struct secpolicy *
key_newsp(id)
    u_int32_t id;
{
    struct secpolicy *newsp = NULL, *sp;
    u_int32_t newid;

    if (id > IPSEC_MANUAL_POLICYID_MAX) {
        ipseclog((LOG_DEBUG,
            "key_newsp: policy_id=%u range "
            "violation, updated by kernel.\n", id));
        id = 0;
    }

    if (id == 0) {
        if ((newid = keydb_newspid()) == 0) {
            ipseclog((LOG_DEBUG,
                "key_newsp: new policy_id allocation failed."));
            return NULL;
        }
    } else {
        sp = key_getspbyid(id);
        if (sp != NULL) {
            ipseclog((LOG_DEBUG,
                "key_newsp: policy_id(%u) has been used.\n", id));
            key_freesp(sp);
            return NULL;
        }
        newid = id;
    }

    newsp = keydb_newsecpolicy();
    if (!newsp)
        return newsp;

    newsp->id = newid;
    newsp->refcnt = 1;
    newsp->req = NULL;

    return newsp;
}

/*
 * create secpolicy structure from sadb_x_policy structure.
 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set,
 * so must be set properly later.
 */
struct secpolicy *
key_msg2sp(xpl0, len, error)
    struct sadb_x_policy *xpl0;
    size_t len;
    int *error;
{
    struct secpolicy *newsp;

    /* sanity check */
    if (xpl0 == NULL)
        panic("key_msg2sp: NULL pointer was passed.");
    if (len < sizeof(*xpl0))
        panic("key_msg2sp: invalid length.");
    if (len != PFKEY_EXTLEN(xpl0)) {
        ipseclog((LOG_DEBUG, "key_msg2sp: Invalid msg length.\n"));
        *error = EINVAL;
        return NULL;
    }

    if ((newsp = key_newsp(xpl0->sadb_x_policy_id)) == NULL) {
        *error = ENOBUFS;
        return NULL;
    }

    newsp->dir = xpl0->sadb_x_policy_dir;
    newsp->policy = xpl0->sadb_x_policy_type;

    /* check policy */
    switch (xpl0->sadb_x_policy_type) {
    case IPSEC_POLICY_DISCARD:
    case IPSEC_POLICY_NONE:
    case IPSEC_POLICY_ENTRUST:
    case IPSEC_POLICY_BYPASS:
        newsp->req = NULL;
        break;

    case IPSEC_POLICY_IPSEC:
        {
        int tlen;
        struct sadb_x_ipsecrequest *xisr;
        struct ipsecrequest **p_isr = &newsp->req;

        /* validity check */
        if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
            ipseclog((LOG_DEBUG,
                "key_msg2sp: Invalid msg length.\n"));
            key_freesp(newsp);
            *error = EINVAL;
            return NULL;
        }

        tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
        xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);

        while (tlen > 0) {

            /* length check */
            if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) {
                ipseclog((LOG_DEBUG, "key_msg2sp: "
                    "invalid ipsecrequest length.\n"));
                key_freesp(newsp);
                *error = EINVAL;
                return NULL;
            }

            /* allocate request buffer */
            KMALLOC(*p_isr, struct ipsecrequest *, sizeof(**p_isr));
            if ((*p_isr) == NULL) {
                ipseclog((LOG_DEBUG,
                    "key_msg2sp: No more memory.\n"));
                key_freesp(newsp);
                *error = ENOBUFS;
                return NULL;
            }
            bzero(*p_isr, sizeof(**p_isr));

            /* set values */
            (*p_isr)->next = NULL;

            switch (xisr->sadb_x_ipsecrequest_proto) {
            case IPPROTO_ESP:
            case IPPROTO_AH:
            case IPPROTO_IPCOMP:
                break;
            default:
                ipseclog((LOG_DEBUG,
                    "key_msg2sp: invalid proto type=%u\n",
                    xisr->sadb_x_ipsecrequest_proto));
                key_freesp(newsp);
                *error = EPROTONOSUPPORT;
                return NULL;
            }
            (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto;

            switch (xisr->sadb_x_ipsecrequest_mode) {
            case IPSEC_MODE_TRANSPORT:
            case IPSEC_MODE_TUNNEL:
                break;
            case IPSEC_MODE_ANY:
            default:
                ipseclog((LOG_DEBUG,
                    "key_msg2sp: invalid mode=%u\n",
                    xisr->sadb_x_ipsecrequest_mode));
                key_freesp(newsp);
                *error = EINVAL;
                return NULL;
            }
            (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode;

            switch (xisr->sadb_x_ipsecrequest_level) {
            case IPSEC_LEVEL_DEFAULT:
            case IPSEC_LEVEL_USE:
            case IPSEC_LEVEL_REQUIRE:
                break;
            case IPSEC_LEVEL_UNIQUE:
                /* validity check */
                /*
                 * If range violation of reqid, kernel will
                 * update it, don't refuse it.
                 */
                if (xisr->sadb_x_ipsecrequest_reqid
                        > IPSEC_MANUAL_REQID_MAX) {
                    ipseclog((LOG_DEBUG,
                        "key_msg2sp: reqid=%u range "
                        "violation, updated by kernel.\n",
                        xisr->sadb_x_ipsecrequest_reqid));
                    xisr->sadb_x_ipsecrequest_reqid = 0;
                }

                /* allocate new reqid id if reqid is zero. */
                if (xisr->sadb_x_ipsecrequest_reqid == 0) {
                    u_int32_t reqid;
                    if ((reqid = key_newreqid()) == 0) {
                        key_freesp(newsp);
                        *error = ENOBUFS;
                        return NULL;
                    }
                    (*p_isr)->saidx.reqid = reqid;
                    xisr->sadb_x_ipsecrequest_reqid = reqid;
                } else {
                /* set it for manual keying. */
                    (*p_isr)->saidx.reqid =
                        xisr->sadb_x_ipsecrequest_reqid;
                }
                break;

            default:
                ipseclog((LOG_DEBUG, "key_msg2sp: invalid level=%u\n",
                    xisr->sadb_x_ipsecrequest_level));
                key_freesp(newsp);
                *error = EINVAL;
                return NULL;
            }
            (*p_isr)->level = xisr->sadb_x_ipsecrequest_level;

            /* set IP addresses if there */
            if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
                struct sockaddr *paddr;

                paddr = (struct sockaddr *)(xisr + 1);

                /* validity check */
                if (paddr->sa_len
                    > sizeof((*p_isr)->saidx.src)) {
                    ipseclog((LOG_DEBUG, "key_msg2sp: invalid request "
                        "address length.\n"));
                    key_freesp(newsp);
                    *error = EINVAL;
                    return NULL;
                }
                bcopy(paddr, &(*p_isr)->saidx.src,
                    paddr->sa_len);

                paddr = (struct sockaddr *)((caddr_t)paddr
                            + paddr->sa_len);

                /* validity check */
                if (paddr->sa_len
                    > sizeof((*p_isr)->saidx.dst)) {
                    ipseclog((LOG_DEBUG, "key_msg2sp: invalid request "
                        "address length.\n"));
                    key_freesp(newsp);
                    *error = EINVAL;
                    return NULL;
                }
                bcopy(paddr, &(*p_isr)->saidx.dst,
                    paddr->sa_len);
            }

            (*p_isr)->sav = NULL;
            (*p_isr)->sp = newsp;

            /* initialization for the next. */
            p_isr = &(*p_isr)->next;
            tlen -= xisr->sadb_x_ipsecrequest_len;

            /* validity check */
            if (tlen < 0) {
                ipseclog((LOG_DEBUG, "key_msg2sp: becoming tlen < 0.\n"));
                key_freesp(newsp);
                *error = EINVAL;
                return NULL;
            }

            xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
                             + xisr->sadb_x_ipsecrequest_len);
        }
        }
        break;
    default:
        ipseclog((LOG_DEBUG, "key_msg2sp: invalid policy type.\n"));
        key_freesp(newsp);
        *error = EINVAL;
        return NULL;
    }

    *error = 0;
    return newsp;
}

static u_int32_t
key_newreqid()
{
    static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;

    auto_reqid = (auto_reqid == ~0
            ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1);

    /* XXX should be unique check */

    return auto_reqid;
}

/*
 * copy secpolicy struct to sadb_x_policy structure indicated.
 */
struct mbuf *
key_sp2msg(sp)
    struct secpolicy *sp;
{
    struct sadb_x_policy *xpl;
    int tlen;
    caddr_t p;
    struct mbuf *m;

    /* sanity check. */
    if (sp == NULL)
        panic("key_sp2msg: NULL pointer was passed.");

    tlen = key_getspreqmsglen(sp);

    m = key_alloc_mbuf(tlen);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        return NULL;
    }

    m->m_len = tlen;
    m->m_next = NULL;
    xpl = mtod(m, struct sadb_x_policy *);
    bzero(xpl, tlen);

    xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen);
    xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
    xpl->sadb_x_policy_type = sp->policy;
    xpl->sadb_x_policy_dir = sp->dir;
    xpl->sadb_x_policy_id = sp->id;
    p = (caddr_t)xpl + sizeof(*xpl);

    /* if is the policy for ipsec ? */
    if (sp->policy == IPSEC_POLICY_IPSEC) {
        struct sadb_x_ipsecrequest *xisr;
        struct ipsecrequest *isr;

        for (isr = sp->req; isr != NULL; isr = isr->next) {

            xisr = (struct sadb_x_ipsecrequest *)p;

            xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
            xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
            xisr->sadb_x_ipsecrequest_level = isr->level;
            xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;

            p += sizeof(*xisr);
            bcopy(&isr->saidx.src, p, isr->saidx.src.ss_len);
            p += isr->saidx.src.ss_len;
            bcopy(&isr->saidx.dst, p, isr->saidx.dst.ss_len);
            p += isr->saidx.src.ss_len;

            xisr->sadb_x_ipsecrequest_len =
                PFKEY_ALIGN8(sizeof(*xisr) +
                isr->saidx.src.ss_len + isr->saidx.dst.ss_len);
        }
    }

    return m;
}

/* m will not be freed nor modified */
static struct mbuf *
#ifdef __STDC__
key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
    int ndeep, int nitem, ...)
#else
key_gather_mbuf(m, mhp, ndeep, nitem, va_alist)
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
    int ndeep;
    int nitem;
    va_dcl
#endif
{
    va_list ap;
    int idx;
    int i;
    struct mbuf *result = NULL, *n;
    int len;

    if (m == NULL || mhp == NULL)
        panic("null pointer passed to key_gather");

    va_start(ap, nitem);
    for (i = 0; i < nitem; i++) {
        idx = va_arg(ap, int);
        if (idx < 0 || idx > SADB_EXT_MAX)
            goto fail;
        /* don't attempt to pull empty extension */
        if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
            continue;
        if (idx != SADB_EXT_RESERVED  &&
            (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
            continue;

        if (idx == SADB_EXT_RESERVED) {
            len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
#ifdef DIAGNOSTIC
            if (len > MHLEN)
                panic("assumption failed");
#endif
            MGETHDR(n, M_DONTWAIT, MT_DATA);
            if (!n)
                goto fail;
            n->m_len = len;
            n->m_next = NULL;
            m_copydata(m, 0, sizeof(struct sadb_msg),
                mtod(n, caddr_t));
        } else if (i < ndeep) {
            len = mhp->extlen[idx];
            n = key_alloc_mbuf(len);
            if (!n || n->m_next) {    /*XXX*/
                if (n)
                    m_freem(n);
                goto fail;
            }
            m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
                mtod(n, caddr_t));
        } else {
            n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
                M_DONTWAIT);
        }
        if (n == NULL)
            goto fail;

        if (result)
            m_cat(result, n);
        else
            result = n;
    }
    va_end(ap);

    if ((result->m_flags & M_PKTHDR) != 0) {
        result->m_pkthdr.len = 0;
        for (n = result; n; n = n->m_next)
            result->m_pkthdr.len += n->m_len;
    }

    return result;

fail:
    va_end(ap);
    m_freem(result);
    return NULL;
}

/*
 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
 * add an entry to SP database, when received
 *   <base, address(SD), (lifetime(H),) policy>
 * from the user(?).
 * Adding to SP database,
 * and send
 *   <base, address(SD), (lifetime(H),) policy>
 * to the socket which was send.
 *
 * SPDADD set a unique policy entry.
 * SPDSETIDX like SPDADD without a part of policy requests.
 * SPDUPDATE replace a unique policy entry.
 *
 * m will always be freed.
 */
static int
key_spdadd(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_address *src0 = NULL, *dst0 = NULL;
    struct sadb_x_policy *xpl0, *xpl;
    struct sadb_lifetime *lft = NULL;
    struct secpolicyindex spidx;
    struct secpolicy *newsp;
    struct ipsecrequest *isr;
    int error;
    int spidxmode;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_spdadd: NULL pointer is passed.");

    if (mhp->ext[SADB_EXT_ADDRESS_SRC] != NULL &&
        mhp->ext[SADB_EXT_ADDRESS_DST] != NULL) {
        ;
    } else {
        ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->ext[SADB_X_EXT_POLICY] == NULL) {
        ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if ((mhp->extlen[SADB_EXT_ADDRESS_SRC] &&
         mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address)) ||
        (mhp->extlen[SADB_EXT_ADDRESS_DST] &&
         mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) ||
        mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
        ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) {
        if (mhp->extlen[SADB_EXT_LIFETIME_HARD]
            < sizeof(struct sadb_lifetime)) {
            ipseclog((LOG_DEBUG, "key_spdadd: invalid message is
passed.\n"));
            return key_senderror(so, m, EINVAL);
        }
        lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
    }

    /* spidx mode, or tag mode */
    spidxmode = (mhp->ext[SADB_EXT_ADDRESS_SRC] != NULL);

    if (spidxmode) {
        src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
        dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
        /* make secindex */
        /* XXX boundary check against sa_len */
        KEY_SETSECSPIDX(src0 + 1, dst0 + 1,
            src0->sadb_address_prefixlen, dst0->sadb_address_prefixlen,
            src0->sadb_address_proto, &spidx);
    }
    xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];

    /* checking the direciton. */
    switch (xpl0->sadb_x_policy_dir) {
    case IPSEC_DIR_INBOUND:
    case IPSEC_DIR_OUTBOUND:
        break;
    default:
        ipseclog((LOG_DEBUG, "key_spdadd: Invalid SP direction.\n"));
        mhp->msg->sadb_msg_errno = EINVAL;
        return 0;
    }

    /* check policy */
    /* key_spdadd() accepts DISCARD, NONE and IPSEC. */
    if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST ||
        xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
        ipseclog((LOG_DEBUG, "key_spdadd: Invalid policy type.\n"));
        return key_senderror(so, m, EINVAL);
    }

    /* policy requests are mandatory when action is ipsec. */
    if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX &&
        xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
        mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
        ipseclog((LOG_DEBUG, "key_spdadd: some policy requests part
required.\n"));
        return key_senderror(so, m, EINVAL);
    }

    /*
     * checking there is SP already or not.
     * SPDUPDATE doesn't depend on whether there is a SP or not.
     * If the type is either SPDADD or SPDSETIDX AND a SP is found,
     * then error.
     */
    if (xpl0->sadb_x_policy_id != 0)
        newsp = key_getspbyid(xpl0->sadb_x_policy_id);
    else if (spidxmode)
        newsp = key_getsp(&spidx, xpl0->sadb_x_policy_dir);
    else
        newsp = NULL;

    if (newsp && (newsp->readonly || newsp->persist)) {
        ipseclog((LOG_DEBUG,
            "key_spdadd: tried to alter readonly/persistent SP.\n"));
        return key_senderror(so, m, EPERM);
    }

    if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
        if (newsp) {
            key_sp_dead(newsp);
            key_freesp(newsp);    /* ref gained by key_getsp */
            key_sp_unlink(newsp);
            newsp = NULL;
        }
    } else {
        if (newsp != NULL) {
            key_freesp(newsp);
            ipseclog((LOG_DEBUG, "key_spdadd: a SP entry exists
already.\n"));
            return key_senderror(so, m, EEXIST);
        }
    }

    /* allocation new SP entry */
    if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
        return key_senderror(so, m, error);
    }

    if (spidxmode) {
        error = keydb_setsecpolicyindex(newsp, &spidx);
        if (error) {
            keydb_delsecpolicy(newsp);
            return key_senderror(so, m, error);
        }

        /* sanity check on addr pair */
        if (((struct sockaddr *)(src0 + 1))->sa_family !=
                ((struct sockaddr *)(dst0 + 1))->sa_family) {
            keydb_delsecpolicy(newsp);
            return key_senderror(so, m, EINVAL);
        }
        if (((struct sockaddr *)(src0 + 1))->sa_len !=
                ((struct sockaddr *)(dst0 + 1))->sa_len) {
            keydb_delsecpolicy(newsp);
            return key_senderror(so, m, EINVAL);
        }
    }

    for (isr = newsp->req; isr; isr = isr->next) {
        struct sockaddr *sa;

        /*
         * port spec is not permitted for tunnel mode
         */
        if (isr->saidx.mode == IPSEC_MODE_TUNNEL && src0 && dst0) {
            sa = (struct sockaddr *)(src0 + 1);
            switch (sa->sa_family) {
            case AF_INET:
                if (((struct sockaddr_in *)sa)->sin_port) {
                    keydb_delsecpolicy(newsp);
                    return key_senderror(so, m, EINVAL);
                }
                break;
            case AF_INET6:
                if (((struct sockaddr_in6 *)sa)->sin6_port) {
                    keydb_delsecpolicy(newsp);
                    return key_senderror(so, m, EINVAL);
                }
                break;
            default:
                break;
            }
            sa = (struct sockaddr *)(dst0 + 1);
            switch (sa->sa_family) {
            case AF_INET:
                if (((struct sockaddr_in *)sa)->sin_port) {
                    keydb_delsecpolicy(newsp);
                    return key_senderror(so, m, EINVAL);
                }
                break;
            case AF_INET6:
                if (((struct sockaddr_in6 *)sa)->sin6_port) {
                    keydb_delsecpolicy(newsp);
                    return key_senderror(so, m, EINVAL);
                }
                break;
            default:
                break;
            }
        }
    }

    /*
     * bark if we have different address family on tunnel address
     * specification.  applies only if we decapsulate in RFC2401
     * IPsec (implementation limitation).
     */
    for (isr = newsp->req; isr; isr = isr->next) {
        struct sockaddr *sa;

        if (isr->saidx.src.ss_family && src0) {
            sa = (struct sockaddr *)(src0 + 1);
            if (sa->sa_family != isr->saidx.src.ss_family) {
                keydb_delsecpolicy(newsp);
                return key_senderror(so, m, EINVAL);
            }
        }
        if (isr->saidx.dst.ss_family && dst0) {
            sa = (struct sockaddr *)(dst0 + 1);
            if (sa->sa_family != isr->saidx.dst.ss_family) {
                keydb_delsecpolicy(newsp);
                return key_senderror(so, m, EINVAL);
            }
        }
    }

    newsp->created = time_second;
    newsp->lastused = time_second;
    newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
    newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;

    newsp->state = IPSEC_SPSTATE_ALIVE;
    LIST_INSERT_TAIL(&sptree[newsp->dir], newsp, secpolicy, chain);

    /* delete the entry in spacqtree */
    if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE &&
        mhp->ext[SADB_EXT_ADDRESS_SRC]) {
        struct secspacq *spacq;
        if ((spacq = key_getspacq(&spidx)) != NULL) {
            /* reset counter in order to deletion by timehandler. */
            spacq->created = time_second;
            spacq->count = 0;
        }
        }

    /* invalidate all cached SPD pointers on pcb */
    ipsec_invalpcbcacheall();

    {
    struct mbuf *n, *mpolicy;
    struct sadb_msg *newmsg;
    int off;

    /* create new sadb_msg to reply. */
    if (lft) {
        n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
            SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
            SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
    } else {
        n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
            SADB_X_EXT_POLICY,
            SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
    }
    if (!n)
        return key_senderror(so, m, ENOBUFS);

    if (n->m_len < sizeof(*newmsg)) {
        n = m_pullup(n, sizeof(*newmsg));
        if (!n)
            return key_senderror(so, m, ENOBUFS);
    }
    newmsg = mtod(n, struct sadb_msg *);
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);

    off = 0;
    mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
        sizeof(*xpl), &off);
    if (mpolicy == NULL) {
        /* n is already freed */
        return key_senderror(so, m, ENOBUFS);
    }
    xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
    if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
        m_freem(n);
        return key_senderror(so, m, EINVAL);
    }
    xpl->sadb_x_policy_id = newsp->id;

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
    }
}

/*
 * SADB_SPDDELETE processing
 * receive
 *   <base, address(SD), policy(*)>
 * from the user(?), and set SADB_SASTATE_DEAD,
 * and send,
 *   <base, address(SD), policy(*)>
 * to the ikmpd.
 * policy(*) including the direction of the policy.
 *
 * m will always be freed.
 */
static int
key_spddelete(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_address *src0, *dst0;
    struct sadb_x_policy *xpl0;
    struct secpolicyindex spidx;
    struct secpolicy *sp;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_spddelete: NULL pointer is passed.");

    if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
        mhp->ext[SADB_X_EXT_POLICY] == NULL) {
        ipseclog((LOG_DEBUG, "key_spddelete: invalid message is
passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
        ipseclog((LOG_DEBUG, "key_spddelete: invalid message is
passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
    dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
    xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];

    /* make secindex */
    /* XXX boundary check against sa_len */
    KEY_SETSECSPIDX(src0 + 1,
                    dst0 + 1,
                    src0->sadb_address_prefixlen,
                    dst0->sadb_address_prefixlen,
                    src0->sadb_address_proto,
                    &spidx);

    /* checking the direciton. */
    switch (xpl0->sadb_x_policy_dir) {
    case IPSEC_DIR_INBOUND:
    case IPSEC_DIR_OUTBOUND:
        break;
    default:
        ipseclog((LOG_DEBUG, "key_spddelete: Invalid SP direction.\n"));
        return key_senderror(so, m, EINVAL);
    }

    /* Is there SP in SPD ? */
    if ((sp = key_getsp(&spidx, xpl0->sadb_x_policy_dir)) == NULL) {
        ipseclog((LOG_DEBUG, "key_spddelete: no SP found.\n"));
        return key_senderror(so, m, EINVAL);
    }

    if (sp->persist) {
        ipseclog((LOG_DEBUG,
            "key_spddelete2: attempt to remove persistent SP:%u.\n",
            sp->id));
        key_freesp(sp);    /* ref gained by key_getsp */
        return key_senderror(so, m, EPERM);
    }

    /* save policy id to be returned. */
    xpl0->sadb_x_policy_id = sp->id;

    key_sp_dead(sp);
    key_freesp(sp);    /* ref gained by key_getsp */
    key_sp_unlink(sp);
    sp = NULL;

    /* invalidate all cached SPD pointers on pcb */
    ipsec_invalpcbcacheall();

    {
    struct mbuf *n;
    struct sadb_msg *newmsg;

    /* create new sadb_msg to reply. */
    n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
        SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
    if (!n)
        return key_senderror(so, m, ENOBUFS);

    newmsg = mtod(n, struct sadb_msg *);
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
    }
}

/*
 * SADB_SPDDELETE2 processing
 * receive
 *   <base, policy(*)>
 * from the user(?), and set SADB_SASTATE_DEAD,
 * and send,
 *   <base, policy(*)>
 * to the ikmpd.
 * policy(*) including the policy id.
 *
 * m will always be freed.
 */
static int
key_spddelete2(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    u_int32_t id;
    struct secpolicy *sp;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_spddelete2: NULL pointer is passed.");

    if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
        mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
        ipseclog((LOG_DEBUG, "key_spddelete2: invalid message is
passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    id = ((struct sadb_x_policy
*)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;

    /* Is there SP in SPD ? */
    if ((sp = key_getspbyid(id)) == NULL) {
        ipseclog((LOG_DEBUG, "key_spddelete2: no SP found id:%u.\n",
            id));
        return key_senderror(so, m, EINVAL);
    }

    if (sp->persist) {
        ipseclog((LOG_DEBUG,
            "key_spddelete2: attempt to remove persistent SP:%u.\n",
            id));
        key_freesp(sp);    /* ref gained by key_getspbyid */
        return key_senderror(so, m, EPERM);
    }

    key_sp_dead(sp);
    key_freesp(sp);    /* ref gained by key_getspbyid */
    key_sp_unlink(sp);
    sp = NULL;

    /* invalidate all cached SPD pointers on pcb */
    ipsec_invalpcbcacheall();

    {
    struct mbuf *n, *nn;
    struct sadb_msg *newmsg;
    int off, len;

    /* create new sadb_msg to reply. */
    len = PFKEY_ALIGN8(sizeof(struct sadb_msg));

    if (len > MCLBYTES)
        return key_senderror(so, m, ENOBUFS);
    MGETHDR(n, M_DONTWAIT, MT_DATA);
    if (n && len > MHLEN) {
        MCLGET(n, M_DONTWAIT);
        if ((n->m_flags & M_EXT) == 0) {
            m_freem(n);
            n = NULL;
        }
    }
    if (!n)
        return key_senderror(so, m, ENOBUFS);

    n->m_len = len;
    n->m_next = NULL;
    off = 0;

    m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
    off += PFKEY_ALIGN8(sizeof(struct sadb_msg));

#ifdef DIAGNOSTIC
    if (off != len)
        panic("length inconsistency in key_spddelete2");
#endif

    n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
        mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT);
    if (!n->m_next) {
        m_freem(n);
        return key_senderror(so, m, ENOBUFS);
    }

    n->m_pkthdr.len = 0;
    for (nn = n; nn; nn = nn->m_next)
        n->m_pkthdr.len += nn->m_len;

    newmsg = mtod(n, struct sadb_msg *);
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
    }
}

/*
 * SADB_X_SPDGET processing
 * receive
 *   <base, policy(*)>
 * from the user(?),
 * and send,
 *   <base, address(SD), policy>
 * to the ikmpd.
 * policy(*) including direction of policy.
 *
 * m will always be freed.
 */
static int
key_spdget(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    u_int32_t id;
    struct secpolicy *sp;
    struct mbuf *n;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_spdget: NULL pointer is passed.");

    if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
        mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
        ipseclog((LOG_DEBUG, "key_spdget: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    id = ((struct sadb_x_policy
*)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;

    /* Is there SP in SPD ? */
    if ((sp = key_getspbyid(id)) == NULL) {
        ipseclog((LOG_DEBUG, "key_spdget: no SP found id:%u.\n", id));
        return key_senderror(so, m, ENOENT);
    }

    n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid);
    key_freesp(sp);    /* ref gained by key_getspbyid */
    if (n != NULL) {
        m_freem(m);
        return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
    } else
        return key_senderror(so, m, ENOBUFS);
}

/*
 * SADB_X_SPDACQUIRE processing.
 * Acquire policy and SA(s) for a *OUTBOUND* packet.
 * send
 *   <base, policy(*)>
 * to KMD, and expect to receive
 *   <base> with SADB_X_SPDACQUIRE if error occured,
 * or
 *   <base, policy>
 * with SADB_X_SPDUPDATE from KMD by PF_KEY.
 * policy(*) is without policy requests.
 *
 *    0     : succeed
 *    others: error number
 */
int
key_spdacquire(sp)
    struct secpolicy *sp;
{
    struct mbuf *result = NULL, *m;
#ifndef IPSEC_NONBLOCK_ACQUIRE
    struct secspacq *newspacq;
#endif
    int error = -1;

    /* sanity check */
    if (sp == NULL)
        panic("key_spdacquire: NULL pointer is passed.");
    if (sp->req != NULL)
        panic("key_spdacquire: called but there is request.");
    if (sp->policy != IPSEC_POLICY_IPSEC)
        panic("key_spdacquire: policy mismathed. IPsec is expected.");
    if (!sp->spidx) {
        error = EOPNOTSUPP;
        goto fail;
    }

#ifndef IPSEC_NONBLOCK_ACQUIRE
    /* get an entry to check whether sent message or not. */
    if ((newspacq = key_getspacq(sp->spidx)) != NULL) {
        if (key_blockacq_count < newspacq->count) {
            /* reset counter and do send message. */
            newspacq->count = 0;
        } else {
            /* increment counter and do nothing. */
            newspacq->count++;
            return 0;
        }
    } else {
        /* make new entry for blocking to send SADB_ACQUIRE. */
        if ((newspacq = key_newspacq(sp->spidx)) == NULL)
            return ENOBUFS;

        /* add to acqtree */
        LIST_INSERT_HEAD(&spacqtree, newspacq, chain);
    }
#endif

    /* create new sadb_msg to reply. */
    m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    result = m;

    /* set sadb_x_policy */
    if (sp) {
        m = key_setsadbxpolicy(sp->policy, sp->dir, sp->id);
        if (!m) {
            error = ENOBUFS;
            goto fail;
        }
        m_cat(result, m);
    }

    result->m_pkthdr.len = 0;
    for (m = result; m; m = m->m_next)
        result->m_pkthdr.len += m->m_len;

    mtod(result, struct sadb_msg *)->sadb_msg_len =
        PFKEY_UNIT64(result->m_pkthdr.len);

    return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);

fail:
    if (result)
        m_freem(result);
    return error;
}

/*
 * SADB_SPDFLUSH processing
 * receive
 *   <base>
 * from the user, and free all entries in secpctree.
 * and send,
 *   <base>
 * to the user.
 * NOTE: what to do is only marking SADB_SASTATE_DEAD.
 *
 * m will always be freed.
 */
static int
key_spdflush(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_msg *newmsg;
    struct secpolicy *sp, *nextsp;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_spdflush: NULL pointer is passed.");

    if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
        return key_senderror(so, m, EINVAL);

    for (sp = TAILQ_FIRST(&sptailq); sp; sp = nextsp) {
        nextsp = TAILQ_NEXT(sp, tailq);
        if (sp->persist)
            continue;
        if (sp->state == IPSEC_SPSTATE_DEAD)
            continue;
        key_sp_dead(sp);
        key_sp_unlink(sp);
        sp = NULL;
    }

    /* invalidate all cached SPD pointers on pcb */
    ipsec_invalpcbcacheall();

    if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
        ipseclog((LOG_DEBUG, "key_spdflush: No more memory.\n"));
        return key_senderror(so, m, ENOBUFS);
    }

    if (m->m_next)
        m_freem(m->m_next);
    m->m_next = NULL;
    m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
    newmsg = mtod(m, struct sadb_msg *);
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);

    return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
}

/*
 * SADB_SPDDUMP processing
 * receive
 *   <base>
 * from the user, and dump all SP leaves
 * and send,
 *   <base> .....
 * to the ikmpd.
 *
 * m will always be freed.
 */
static int
key_spddump(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct secpolicy *sp;
    int cnt;
    u_int dir;
    struct mbuf *n;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_spddump: NULL pointer is passed.");

    /* search SPD entry and get buffer size. */
    cnt = 0;
    for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
        LIST_FOREACH(sp, &sptree[dir], chain) {
            cnt++;
        }
    }

    if (cnt == 0)
        return key_senderror(so, m, ENOENT);

    for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
        LIST_FOREACH(sp, &sptree[dir], chain) {
            --cnt;
            n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
                mhp->msg->sadb_msg_pid);

            if (n)
                key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
        }
    }

    m_freem(m);
    return 0;
}

static struct mbuf *
key_setdumpsp(sp, type, seq, pid)
    struct secpolicy *sp;
    u_int8_t type;
    u_int32_t seq, pid;
{
    struct mbuf *result = NULL, *m;

    m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
    if (!m)
        goto fail;
    result = m;

    if (sp->spidx) {
        m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
            (struct sockaddr *)&sp->spidx->src, sp->spidx->prefs,
            sp->spidx->ul_proto);
        if (!m)
            goto fail;
        m_cat(result, m);

        m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
            (struct sockaddr *)&sp->spidx->dst, sp->spidx->prefd,
            sp->spidx->ul_proto);
        if (!m)
            goto fail;
        m_cat(result, m);
    }

    m = key_sp2msg(sp);
    if (!m)
        goto fail;
    m_cat(result, m);

    m = key_setsadblifetime(SADB_EXT_LIFETIME_CURRENT,
        0, 0, (u_int64_t)sp->created, (u_int64_t)sp->lastused);
    if (!m)
        goto fail;
    m_cat(result, m);

    m = key_setsadblifetime(SADB_EXT_LIFETIME_HARD,
        0, 0, (u_int64_t)sp->lifetime, (u_int64_t)sp->validtime);
    if (!m)
        goto fail;
    m_cat(result, m);

    if ((result->m_flags & M_PKTHDR) == 0)
        goto fail;

    if (result->m_len < sizeof(struct sadb_msg)) {
        result = m_pullup(result, sizeof(struct sadb_msg));
        if (result == NULL)
            goto fail;
    }

    result->m_pkthdr.len = 0;
    for (m = result; m; m = m->m_next)
        result->m_pkthdr.len += m->m_len;

    mtod(result, struct sadb_msg *)->sadb_msg_len =
        PFKEY_UNIT64(result->m_pkthdr.len);

    return result;

fail:
    m_freem(result);
    return NULL;
}

/*
 * get PFKEY message length for security policy and request.
 */
static u_int
key_getspreqmsglen(sp)
    struct secpolicy *sp;
{
    u_int tlen;

    tlen = sizeof(struct sadb_x_policy);

    /* if is the policy for ipsec ? */
    if (sp->policy != IPSEC_POLICY_IPSEC)
        return tlen;

    /* get length of ipsec requests */
    {
    struct ipsecrequest *isr;
    int len;

    for (isr = sp->req; isr != NULL; isr = isr->next) {
        len = sizeof(struct sadb_x_ipsecrequest)
            + isr->saidx.src.ss_len
            + isr->saidx.dst.ss_len;

        tlen += PFKEY_ALIGN8(len);
    }
    }

    return tlen;
}

/*
 * SADB_X_SPDEXPIRE processing
 * send
 *   <base, address(SD), lifetime(CH), policy>
 * to KMD by PF_KEY.
 *
 * OUT:    0    : succeed
 *    others    : error number
 */
static int
key_spdexpire(sp)
    struct secpolicy *sp;
{
    int s;
    struct mbuf *result = NULL, *m;
    int len;
    int error = -1;
    struct sadb_lifetime *lt;

    /* XXX: Why do we lock ? */
    s = splnet();    /*called from softclock()*/

    /* sanity check */
    if (sp == NULL)
        panic("key_spdexpire: NULL pointer is passed.");

    /* set msg header */
    m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    result = m;

    /* create lifetime extension (current and hard) */
    len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
    m = key_alloc_mbuf(len);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        error = ENOBUFS;
        goto fail;
    }
    bzero(mtod(m, caddr_t), len);
    lt = mtod(m, struct sadb_lifetime *);
    lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
    lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
    lt->sadb_lifetime_allocations = 0;
    lt->sadb_lifetime_bytes = 0;
    lt->sadb_lifetime_addtime = sp->created;
    lt->sadb_lifetime_usetime = sp->lastused;
    lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
    lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
    lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
    lt->sadb_lifetime_allocations = 0;
    lt->sadb_lifetime_bytes = 0;
    lt->sadb_lifetime_addtime = sp->lifetime;
    lt->sadb_lifetime_usetime = sp->validtime;
    m_cat(result, m);

    /* set sadb_address for source */
    if (sp->spidx) {
        m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
            (struct sockaddr *)&sp->spidx->src,
            sp->spidx->prefs, sp->spidx->ul_proto);
        if (!m) {
            error = ENOBUFS;
            goto fail;
        }
        m_cat(result, m);

        /* set sadb_address for destination */
        m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
            (struct sockaddr *)&sp->spidx->dst,
            sp->spidx->prefd, sp->spidx->ul_proto);
        if (!m) {
            error = ENOBUFS;
            goto fail;
        }
        m_cat(result, m);
    }

    /* set secpolicy */
    m = key_sp2msg(sp);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    m_cat(result, m);

    if ((result->m_flags & M_PKTHDR) == 0) {
        error = EINVAL;
        goto fail;
    }

    if (result->m_len < sizeof(struct sadb_msg)) {
        result = m_pullup(result, sizeof(struct sadb_msg));
        if (result == NULL) {
            error = ENOBUFS;
            goto fail;
        }
    }

    result->m_pkthdr.len = 0;
    for (m = result; m; m = m->m_next)
        result->m_pkthdr.len += m->m_len;

    mtod(result, struct sadb_msg *)->sadb_msg_len =
        PFKEY_UNIT64(result->m_pkthdr.len);

    splx(s);
    return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);

 fail:
    if (result)
        m_freem(result);
    splx(s);
    return error;
}

/* %%% SAD management */
/*
 * allocating a memory for new SA head, and copy from the values of mhp.
 * OUT:    NULL    : failure due to the lack of memory.
 *    others    : pointer to new SA head.
 */
static struct secashead *
key_newsah(saidx)
    struct secasindex *saidx;
{
    struct secashead *newsah;

    /* sanity check */
    if (saidx == NULL)
        panic("key_newsaidx: NULL pointer is passed.");

    newsah = keydb_newsecashead();
    if (newsah == NULL)
        return NULL;

    bcopy(saidx, &newsah->saidx, sizeof(newsah->saidx));

    /* add to saidxtree */
    newsah->state = SADB_SASTATE_MATURE;
    LIST_INSERT_HEAD(&sahtree, newsah, chain);

    return (newsah);
}

/*
 * delete SA index and all SA registerd.
 */
static void
key_delsah(sah)
    struct secashead *sah;
{
    struct secasvar *sav, *nextsav;
    u_int stateidx, state;
    int s;
    int zombie = 0;

    /* sanity check */
    if (sah == NULL)
        panic("key_delsah: NULL pointer is passed.");

    s = splnet();    /*called from softclock()*/

    /* searching all SA registerd in the secindex. */
    for (stateidx = 0;
         stateidx < _ARRAYLEN(saorder_state_any);
         stateidx++) {

        state = saorder_state_any[stateidx];
        for (sav = LIST_FIRST(&sah->savtree[state]);
             sav != NULL;
             sav = nextsav) {

            nextsav = LIST_NEXT(sav, chain);

            if (sav->refcnt > 0) {
                /* give up to delete this sa */
                zombie++;
                continue;
            }

            /* sanity check */
            KEY_CHKSASTATE(state, sav->state, "key_delsah");

            /* remove back pointer */
            sav->sah = NULL;

            key_freesav(sav);

            sav = NULL;
        }
    }

    /* delete sah only if there's no sav. */
    if (zombie) {
        splx(s);
        return;
    }

    if (sah->sa_route.ro_rt) {
        RTFREE(sah->sa_route.ro_rt);
        sah->sa_route.ro_rt = (struct rtentry *)NULL;
    }

    /* remove from tree of SA index */
    if (__LIST_CHAINED(sah))
        LIST_REMOVE(sah, chain);

    KFREE(sah);

    splx(s);
    return;
}

/*
 * allocating a new SA with LARVAL state.  key_add() and key_getspi() call,
 * and copy the values of mhp into new buffer.
 * When SAD message type is GETSPI:
 *    to set sequence number from acq_seq++,
 *    to set zero to SPI.
 *    not to call key_setsava().
 * OUT:    NULL    : fail
 *    others    : pointer to new secasvar.
 *
 * does not modify mbuf.  does not free mbuf on error.
 */
static struct secasvar *
key_newsav(m, mhp, sah, errp)
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
    struct secashead *sah;
    int *errp;
{
    struct secasvar *newsav;
    const struct sadb_sa *xsa;

    /* sanity check */
    if (m == NULL || mhp == NULL || mhp->msg == NULL || sah == NULL)
        panic("key_newsa: NULL pointer is passed.");

    newsav = keydb_newsecasvar();
    if (newsav == NULL) {
        ipseclog((LOG_DEBUG, "key_newsa: No more memory.\n"));
        *errp = ENOBUFS;
        return NULL;
    }

    switch (mhp->msg->sadb_msg_type) {
    case SADB_GETSPI:
        key_setspi(newsav, 0);

#ifdef IPSEC_DOSEQCHECK
        /* sync sequence number */
        if (mhp->msg->sadb_msg_seq == 0)
            newsav->seq =
                (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
        else
#endif
            newsav->seq = mhp->msg->sadb_msg_seq;
        break;

    case SADB_ADD:
        /* sanity check */
        if (mhp->ext[SADB_EXT_SA] == NULL) {
            KFREE(newsav);
            ipseclog((LOG_DEBUG, "key_newsa: invalid message is
passed.\n"));
            *errp = EINVAL;
            return NULL;
        }
        xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
        key_setspi(newsav, xsa->sadb_sa_spi);
        newsav->seq = mhp->msg->sadb_msg_seq;
        break;
    default:
        KFREE(newsav);
        *errp = EINVAL;
        return NULL;
    }

    /* copy sav values */
    if (mhp->msg->sadb_msg_type != SADB_GETSPI) {
        *errp = key_setsaval(newsav, m, mhp);
        if (*errp) {
            KFREE(newsav);
            return NULL;
        }
    }

    /* reset created */
    newsav->created = time_second;

    newsav->pid = mhp->msg->sadb_msg_pid;

    /* add to satree */
    newsav->sah = sah;
    newsav->refcnt = 1;
    newsav->state = SADB_SASTATE_LARVAL;
    LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav,
            secasvar, chain);

    return newsav;
}

/*
 * search SAD.
 * OUT:
 *    NULL    : not found
 *    others    : found, pointer to a SA.
 */
static struct secashead *
key_getsah(saidx)
    struct secasindex *saidx;
{
    struct secashead *sah;

    LIST_FOREACH(sah, &sahtree, chain) {
        if (sah->state == SADB_SASTATE_DEAD)
            continue;
        if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
            return sah;
    }

    return NULL;
}

/*
 * check not to be duplicated SPI.
 * NOTE: this function is too slow due to searching all SAD.
 * OUT:
 *    NULL    : not found
 *    others    : found, pointer to a SA.
 */
static struct secasvar *
key_checkspidup(saidx, spi)
    struct secasindex *saidx;
    u_int32_t spi;
{
    struct secasvar *sav;
    u_int stateidx, state;

    /* check address family */
    if (saidx->src.ss_family != saidx->dst.ss_family) {
        ipseclog((LOG_DEBUG, "key_checkspidup: address family
mismatched.\n"));
        return NULL;
    }

    /* check all SAD */
    LIST_FOREACH(sav, &spihash[SPIHASH(spi)], spihash) {
        if (sav->spi != spi)
            continue;
        for (stateidx = 0;
             stateidx < _ARRAYLEN(saorder_state_alive);
             stateidx++) {
            state = saorder_state_alive[stateidx];
            if (sav->state == state &&
                key_ismyaddr((struct sockaddr *)&sav->sah->saidx.dst))
                return sav;
        }
    }

    return NULL;
}

static void
key_setspi(sav, spi)
    struct secasvar *sav;
    u_int32_t spi;
{
    int s;

    s = splnet();
    sav->spi = spi;
    if (sav->spihash.le_prev || sav->spihash.le_next)
        LIST_REMOVE(sav, spihash);
    LIST_INSERT_HEAD(&spihash[SPIHASH(spi)], sav, spihash);
    splx(s);
}

/*
 * search SAD litmited alive SA, protocol, SPI.
 * OUT:
 *    NULL    : not found
 *    others    : found, pointer to a SA.
 */
static struct secasvar *
key_getsavbyspi(sah, spi)
    struct secashead *sah;
    u_int32_t spi;
{
    struct secasvar *sav, *match;
    u_int stateidx, state, matchidx;

    match = NULL;
    matchidx = _ARRAYLEN(saorder_state_alive);
    LIST_FOREACH(sav, &spihash[SPIHASH(spi)], spihash) {
        if (sav->spi != spi)
            continue;
        if (sav->sah != sah)
            continue;
        for (stateidx = 0; stateidx < matchidx; stateidx++) {
            state = saorder_state_alive[stateidx];
            if (sav->state == state) {
                match = sav;
                matchidx = stateidx;
                break;
            }
        }
    }

    return match;
}

/*
 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and
TYPE*.
 * You must update these if need.
 * OUT:    0:    success.
 *    !0:    failure.
 *
 * does not modify mbuf.  does not free mbuf on error.
 */
static int
key_setsaval(sav, m, mhp)
    struct secasvar *sav;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
#ifdef IPSEC_ESP
    const struct esp_algorithm *algo;
#endif
    int error = 0;

    /* sanity check */
    if (m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_setsaval: NULL pointer is passed.");

    /* initialization */
    sav->replay = NULL;
    sav->key_auth = NULL;
    sav->key_enc = NULL;
    sav->sched = NULL;
    sav->schedlen = 0;
    sav->iv = NULL;
    sav->lft_c = NULL;
    sav->lft_h = NULL;
    sav->lft_s = NULL;

    /* SA */
    if (mhp->ext[SADB_EXT_SA] != NULL) {
        const struct sadb_sa *sa0;

        sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
        if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) {
            error = EINVAL;
            goto fail;
        }

        sav->alg_auth = sa0->sadb_sa_auth;
        sav->alg_enc = sa0->sadb_sa_encrypt;
        sav->flags = sa0->sadb_sa_flags;

        /* replay window */
        if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) {
            sav->replay = keydb_newsecreplay(sa0->sadb_sa_replay);
            if (sav->replay == NULL) {
                ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
                error = ENOBUFS;
                goto fail;
            }
        }
    }

    /* Authentication keys */
    if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) {
        const struct sadb_key *key0;
        int len;

        key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
        len = mhp->extlen[SADB_EXT_KEY_AUTH];

        error = 0;
        if (len < sizeof(*key0)) {
            error = EINVAL;
            goto fail;
        }
        switch (mhp->msg->sadb_msg_satype) {
        case SADB_SATYPE_AH:
        case SADB_SATYPE_ESP:
        case SADB_X_SATYPE_TCPSIGNATURE:
            if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
                sav->alg_auth != SADB_X_AALG_NULL)
                error = EINVAL;
            break;
        case SADB_X_SATYPE_IPCOMP:
        default:
            error = EINVAL;
            break;
        }
        if (error) {
            ipseclog((LOG_DEBUG, "key_setsaval: invalid key_auth
values.\n"));
            goto fail;
        }

        sav->key_auth = (struct sadb_key *)key_newbuf(key0, len);
        if (sav->key_auth == NULL) {
            ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
            error = ENOBUFS;
            goto fail;
        }
    }

    /* Encryption key */
    if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) {
        const struct sadb_key *key0;
        int len;

        key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
        len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];

        error = 0;
        if (len < sizeof(*key0)) {
            error = EINVAL;
            goto fail;
        }
        switch (mhp->msg->sadb_msg_satype) {
        case SADB_SATYPE_ESP:
            if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
                sav->alg_enc != SADB_EALG_NULL) {
                error = EINVAL;
                break;
            }
            sav->key_enc = (struct sadb_key *)key_newbuf(key0, len);
            if (sav->key_enc == NULL) {
                ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
                error = ENOBUFS;
                goto fail;
            }
            break;
        case SADB_X_SATYPE_IPCOMP:
            if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
                error = EINVAL;
            sav->key_enc = NULL;    /*just in case*/
            break;
        case SADB_SATYPE_AH:
        case SADB_X_SATYPE_TCPSIGNATURE:
        default:
            error = EINVAL;
            break;
        }
        if (error) {
            ipseclog((LOG_DEBUG, "key_setsatval: invalid key_enc
value.\n"));
            goto fail;
        }
    }

    /* set iv */
    sav->ivlen = 0;

    switch (mhp->msg->sadb_msg_satype) {
    case SADB_SATYPE_ESP:
#ifdef IPSEC_ESP
        algo = esp_algorithm_lookup(sav->alg_enc);
        if (algo && algo->ivlen)
            sav->ivlen = (*algo->ivlen)(algo, sav);
        if (sav->ivlen == 0)
            break;
        KMALLOC(sav->iv, caddr_t, sav->ivlen);
        if (sav->iv == 0) {
            ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
            error = ENOBUFS;
            goto fail;
        }

        /* initialize */
        key_randomfill(sav->iv, sav->ivlen);
#endif
        break;
    case SADB_SATYPE_AH:
    case SADB_X_SATYPE_IPCOMP:
    case SADB_X_SATYPE_TCPSIGNATURE:
        break;
    default:
        ipseclog((LOG_DEBUG, "key_setsaval: invalid SA type.\n"));
        error = EINVAL;
        goto fail;
    }

    /* reset created */
    sav->created = time_second;

    /* make lifetime for CURRENT */
    KMALLOC(sav->lft_c, struct sadb_lifetime *,
        sizeof(struct sadb_lifetime));
    if (sav->lft_c == NULL) {
        ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
        error = ENOBUFS;
        goto fail;
    }

    sav->lft_c->sadb_lifetime_len =
        PFKEY_UNIT64(sizeof(struct sadb_lifetime));
    sav->lft_c->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
    sav->lft_c->sadb_lifetime_allocations = 0;
    sav->lft_c->sadb_lifetime_bytes = 0;
    sav->lft_c->sadb_lifetime_addtime = time_second;
    sav->lft_c->sadb_lifetime_usetime = 0;

    /* lifetimes for HARD and SOFT */
    {
    const struct sadb_lifetime *lft0;

    lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
    if (lft0 != NULL) {
        if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) {
            error = EINVAL;
            goto fail;
        }
        sav->lft_h = (struct sadb_lifetime *)key_newbuf(lft0,
            sizeof(*lft0));
        if (sav->lft_h == NULL) {
            ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
            error = ENOBUFS;
            goto fail;
        }
        /* we no longer support byte lifetime */
        if (sav->lft_h->sadb_lifetime_bytes) {
            error = EINVAL;
            goto fail;
        }
        /* initialize? */
    }

    lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT];
    if (lft0 != NULL) {
        if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) {
            error = EINVAL;
            goto fail;
        }
        sav->lft_s = (struct sadb_lifetime *)key_newbuf(lft0,
            sizeof(*lft0));
        if (sav->lft_s == NULL) {
            ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
            error = ENOBUFS;
            goto fail;
        }
        /* we no longer support byte lifetime */
        if (sav->lft_s->sadb_lifetime_bytes) {
            error = EINVAL;
            goto fail;
        }
        /* initialize? */
    }
    }

    return 0;

 fail:
    /* initialization */
    if (sav->replay != NULL) {
        keydb_delsecreplay(sav->replay);
        sav->replay = NULL;
    }
    if (sav->key_auth != NULL) {
        bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
        KFREE(sav->key_auth);
        sav->key_auth = NULL;
    }
    if (sav->key_enc != NULL) {
        bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc));
        KFREE(sav->key_enc);
        sav->key_enc = NULL;
    }
    if (sav->sched) {
        bzero(sav->sched, sav->schedlen);
        KFREE(sav->sched);
        sav->sched = NULL;
    }
    if (sav->iv != NULL) {
        KFREE(sav->iv);
        sav->iv = NULL;
    }
    if (sav->lft_c != NULL) {
        KFREE(sav->lft_c);
        sav->lft_c = NULL;
    }
    if (sav->lft_h != NULL) {
        KFREE(sav->lft_h);
        sav->lft_h = NULL;
    }
    if (sav->lft_s != NULL) {
        KFREE(sav->lft_s);
        sav->lft_s = NULL;
    }

    return error;
}

/*
 * validation with a secasvar entry, and set SADB_SATYPE_MATURE.
 * OUT:    0:    valid
 *    other:    errno
 */
static int
key_mature(sav)
    struct secasvar *sav;
{
    int mature;
    int checkmask = 0;    /* 2^0: ealg  2^1: aalg  2^2: calg */
    int mustmask = 0;    /* 2^0: ealg  2^1: aalg  2^2: calg */

    mature = 0;

    /* check SPI value */
    switch (sav->sah->saidx.proto) {
    case IPPROTO_ESP:
    case IPPROTO_AH:
        if (ntohl(sav->spi) >= 0 && ntohl(sav->spi) <= 255) {
            ipseclog((LOG_DEBUG,
                "key_mature: illegal range of SPI %u.\n",
                (u_int32_t)ntohl(sav->spi)));
            return EINVAL;
        }
        break;
    }

    /* check satype */
    switch (sav->sah->saidx.proto) {
    case IPPROTO_ESP:
        /* check flags */
        if ((sav->flags & SADB_X_EXT_OLD) &&
            (sav->flags & SADB_X_EXT_DERIV)) {
            ipseclog((LOG_DEBUG, "key_mature: "
                "invalid flag (derived) given to old-esp.\n"));
            return EINVAL;
        }
        if (sav->alg_auth == SADB_AALG_NONE)
            checkmask = 1;
        else
            checkmask = 3;
        mustmask = 1;
        break;
    case IPPROTO_AH:
        /* check flags */
        if (sav->flags & SADB_X_EXT_DERIV) {
            ipseclog((LOG_DEBUG, "key_mature: "
                "invalid flag (derived) given to AH SA.\n"));
            return EINVAL;
        }
        if (sav->alg_enc != SADB_EALG_NONE) {
            ipseclog((LOG_DEBUG, "key_mature: "
                "protocol and algorithm mismated.\n"));
            return (EINVAL);
        }
        checkmask = 2;
        mustmask = 2;
        break;
    case IPPROTO_IPCOMP:
        if (sav->alg_auth != SADB_AALG_NONE) {
            ipseclog((LOG_DEBUG, "key_mature: "
                "protocol and algorithm mismated.\n"));
            return (EINVAL);
        }
        if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 &&
            ntohl(sav->spi) >= 0x10000) {
            ipseclog((LOG_DEBUG, "key_mature: invalid cpi for IPComp.\n"));
            return (EINVAL);
        }
        checkmask = 4;
        mustmask = 4;
        break;
    case IPPROTO_TCP:
        if (sav->alg_auth != SADB_X_AALG_TCP_MD5) {
            ipseclog((LOG_DEBUG, "key_mature: unsupported authentication
algorithm %u\n",
                sav->alg_auth));
            return (EINVAL);
        }
        if (sav->alg_enc != SADB_EALG_NONE) {
            ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
                "mismated.\n", __func__));
            return(EINVAL);
        }
        if (sav->spi != htonl(0x1000)) {
            ipseclog((LOG_DEBUG, "key_mature: SPI must be TCP_SIG_SPI
(0x1000)\n"));
            return (EINVAL);
        }
        checkmask = 2;
        mustmask = 2;
        break;
    default:
        ipseclog((LOG_DEBUG, "key_mature: Invalid satype.\n"));
        return EPROTONOSUPPORT;
    }

    /* check authentication algorithm */
    if ((checkmask & 2) != 0) {
        const struct ah_algorithm *algo;
        int keylen;

        algo = ah_algorithm_lookup(sav->alg_auth);
        if (!algo) {
            ipseclog((LOG_DEBUG, "key_mature: "
                "unknown authentication algorithm.\n"));
            return EINVAL;
        }

        /* algorithm-dependent check */
        if (sav->key_auth)
            keylen = sav->key_auth->sadb_key_bits;
        else
            keylen = 0;
        if (keylen < algo->keymin || algo->keymax < keylen) {
            ipseclog((LOG_DEBUG,
                "key_mature: invalid AH key length %d "
                "(%d-%d allowed)\n",
                keylen, algo->keymin, algo->keymax));
            return EINVAL;
        }

        if (algo->mature) {
            if ((*algo->mature)(sav)) {
                /* message generated in per-algorithm function*/
                return EINVAL;
            } else
                mature = SADB_SATYPE_AH;
        }

        if ((mustmask & 2) != 0 &&  mature != SADB_SATYPE_AH) {
            ipseclog((LOG_DEBUG, "key_mature: no satisfy algorithm for
AH\n"));
            return EINVAL;
        }
    }

    /* check encryption algorithm */
    if ((checkmask & 1) != 0) {
#ifdef IPSEC_ESP
        const struct esp_algorithm *algo;
        int keylen;

        algo = esp_algorithm_lookup(sav->alg_enc);
        if (!algo) {
            ipseclog((LOG_DEBUG, "key_mature: unknown encryption
algorithm.\n"));
            return EINVAL;
        }

        /* algorithm-dependent check */
        if (sav->key_enc)
            keylen = sav->key_enc->sadb_key_bits;
        else
            keylen = 0;
        if (keylen < algo->keymin || algo->keymax < keylen) {
            ipseclog((LOG_DEBUG,
                "key_mature: invalid ESP key length %d "
                "(%d-%d allowed)\n",
                keylen, algo->keymin, algo->keymax));
            return EINVAL;
        }

        if (algo->mature) {
            if ((*algo->mature)(sav)) {
                /* message generated in per-algorithm function*/
                return EINVAL;
            } else
                mature = SADB_SATYPE_ESP;
        }

        if ((mustmask & 1) != 0 &&  mature != SADB_SATYPE_ESP) {
            ipseclog((LOG_DEBUG, "key_mature: no satisfy algorithm for
ESP\n"));
            return EINVAL;
        }
#else /*IPSEC_ESP*/
        ipseclog((LOG_DEBUG, "key_mature: ESP not supported in this
configuration\n"));
        return EINVAL;
#endif
    }

    /* check compression algorithm */
    if ((checkmask & 4) != 0) {
        const struct ipcomp_algorithm *algo;

        /* algorithm-dependent check */
        algo = ipcomp_algorithm_lookup(sav->alg_enc);
        if (!algo) {
            ipseclog((LOG_DEBUG, "key_mature: unknown compression
algorithm.\n"));
            return EINVAL;
        }
    }

    key_sa_chgstate(sav, SADB_SASTATE_MATURE);

    return 0;
}

/*
 * subroutine for SADB_GET and SADB_DUMP.
 */
static struct mbuf *
key_setdumpsa(sav, type, satype, seq, pid)
    struct secasvar *sav;
    u_int8_t type, satype;
    u_int32_t seq, pid;
{
    struct mbuf *result = NULL, *tres = NULL, *m;
    int l = 0;
    int i;
    void *p;
    int dumporder[] = {
        SADB_EXT_SA, SADB_X_EXT_SA2,
        SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
        SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
        SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH,
        SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC,
        SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY,
    };

    m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
    if (m == NULL)
        goto fail;
    result = m;

    for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) {
        m = NULL;
        p = NULL;
        switch (dumporder[i]) {
        case SADB_EXT_SA:
            m = key_setsadbsa(sav);
            if (!m)
                goto fail;
            break;

        case SADB_X_EXT_SA2:
            m = key_setsadbxsa2(sav->sah->saidx.mode,
                sav->replay ? (sav->replay->count & 0xffffffff) : 0,
                sav->sah->saidx.reqid);
            if (!m)
                goto fail;
            break;

        case SADB_EXT_ADDRESS_SRC:
            m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
                (struct sockaddr *)&sav->sah->saidx.src,
                FULLMASK, IPSEC_ULPROTO_ANY);
            if (!m)
                goto fail;
            break;

        case SADB_EXT_ADDRESS_DST:
            m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
                (struct sockaddr *)&sav->sah->saidx.dst,
                FULLMASK, IPSEC_ULPROTO_ANY);
            if (!m)
                goto fail;
            break;

        case SADB_EXT_KEY_AUTH:
            if (!sav->key_auth)
                continue;
            l = PFKEY_UNUNIT64(sav->key_auth->sadb_key_len);
            p = sav->key_auth;
            break;

        case SADB_EXT_KEY_ENCRYPT:
            if (!sav->key_enc)
                continue;
            l = PFKEY_UNUNIT64(sav->key_enc->sadb_key_len);
            p = sav->key_enc;
            break;

        case SADB_EXT_LIFETIME_CURRENT:
            if (!sav->lft_c)
                continue;
            l = PFKEY_UNUNIT64(((struct sadb_ext
*)sav->lft_c)->sadb_ext_len);
            p = sav->lft_c;
            break;

        case SADB_EXT_LIFETIME_HARD:
            if (!sav->lft_h)
                continue;
            l = PFKEY_UNUNIT64(((struct sadb_ext
*)sav->lft_h)->sadb_ext_len);
            p = sav->lft_h;
            break;

        case SADB_EXT_LIFETIME_SOFT:
            if (!sav->lft_s)
                continue;
            l = PFKEY_UNUNIT64(((struct sadb_ext
*)sav->lft_s)->sadb_ext_len);
            p = sav->lft_s;
            break;

        case SADB_EXT_ADDRESS_PROXY:
        case SADB_EXT_IDENTITY_SRC:
        case SADB_EXT_IDENTITY_DST:
            /* XXX: should we brought from SPD ? */
        case SADB_EXT_SENSITIVITY:
        default:
            continue;
        }

        if ((!m && !p) || (m && p))
            goto fail;
        if (p && tres) {
            M_PREPEND(tres, l, M_DONTWAIT);
            if (!tres)
                goto fail;
            bcopy(p, mtod(tres, caddr_t), l);
            continue;
        }
        if (p) {
            m = key_alloc_mbuf(l);
            if (!m)
                goto fail;
            m_copyback(m, 0, l, p);
        }

        if (tres)
            m_cat(m, tres);
        tres = m;
    }

    m_cat(result, tres);

    if (result->m_len < sizeof(struct sadb_msg)) {
        result = m_pullup(result, sizeof(struct sadb_msg));
        if (result == NULL)
            goto fail;
    }

    result->m_pkthdr.len = 0;
    for (m = result; m; m = m->m_next)
        result->m_pkthdr.len += m->m_len;

    mtod(result, struct sadb_msg *)->sadb_msg_len =
        PFKEY_UNIT64(result->m_pkthdr.len);

    return result;

fail:
    m_freem(result);
    m_freem(tres);
    return NULL;
}

/*
 * set data into sadb_msg.
 */
static struct mbuf *
key_setsadbmsg(type, tlen, satype, seq, pid, reserved)
    u_int8_t type, satype;
    u_int16_t tlen;
    u_int32_t seq;
    pid_t pid;
    u_int16_t reserved;
{
    struct mbuf *m;
    struct sadb_msg *p;
    int len;

    len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
    if (len > MCLBYTES)
        return NULL;
    MGETHDR(m, M_DONTWAIT, MT_DATA);
    if (m && len > MHLEN) {
        MCLGET(m, M_DONTWAIT);
        if ((m->m_flags & M_EXT) == 0) {
            m_freem(m);
            m = NULL;
        }
    }
    if (!m)
        return NULL;
    m->m_pkthdr.len = m->m_len = len;
    m->m_next = NULL;

    p = mtod(m, struct sadb_msg *);

    bzero(p, len);
    p->sadb_msg_version = PF_KEY_V2;
    p->sadb_msg_type = type;
    p->sadb_msg_errno = 0;
    p->sadb_msg_satype = satype;
    p->sadb_msg_len = PFKEY_UNIT64(tlen);
    p->sadb_msg_reserved = reserved;
    p->sadb_msg_seq = seq;
    p->sadb_msg_pid = (u_int32_t)pid;

    return m;
}

/*
 * copy secasvar data into sadb_address.
 */
static struct mbuf *
key_setsadbsa(sav)
    struct secasvar *sav;
{
    struct mbuf *m;
    struct sadb_sa *p;
    int len;

    len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
    m = key_alloc_mbuf(len);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        return NULL;
    }

    p = mtod(m, struct sadb_sa *);

    bzero(p, len);
    p->sadb_sa_len = PFKEY_UNIT64(len);
    p->sadb_sa_exttype = SADB_EXT_SA;
    p->sadb_sa_spi = sav->spi;
    p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0);
    p->sadb_sa_state = sav->state;
    p->sadb_sa_auth = sav->alg_auth;
    p->sadb_sa_encrypt = sav->alg_enc;
    p->sadb_sa_flags = sav->flags;

    return m;
}

/*
 * set data into sadb_address.
 */
static struct mbuf *
key_setsadbaddr(exttype, saddr, prefixlen, ul_proto)
    u_int16_t exttype;
    struct sockaddr *saddr;
    u_int8_t prefixlen;
    u_int16_t ul_proto;
{
    struct mbuf *m;
    struct sadb_address *p;
    size_t len;

    len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
        PFKEY_ALIGN8(saddr->sa_len);
    m = key_alloc_mbuf(len);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        return NULL;
    }

    p = mtod(m, struct sadb_address *);

    bzero(p, len);
    p->sadb_address_len = PFKEY_UNIT64(len);
    p->sadb_address_exttype = exttype;
    p->sadb_address_proto = ul_proto;
    if (prefixlen == FULLMASK) {
        switch (saddr->sa_family) {
        case AF_INET:
            prefixlen = sizeof(struct in_addr) << 3;
            break;
        case AF_INET6:
            prefixlen = sizeof(struct in6_addr) << 3;
            break;
        default:
            ; /*XXX*/
        }
    }
    p->sadb_address_prefixlen = prefixlen;
    p->sadb_address_reserved = 0;

    bcopy(saddr,
        mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
        saddr->sa_len);

    return m;
}

#if 0
/*
 * set data into sadb_ident.
 */
static struct mbuf *
key_setsadbident(exttype, idtype, string, stringlen, id)
    u_int16_t exttype, idtype;
    caddr_t string;
    int stringlen;
    u_int64_t id;
{
    struct mbuf *m;
    struct sadb_ident *p;
    size_t len;

    len = PFKEY_ALIGN8(sizeof(struct sadb_ident)) + PFKEY_ALIGN8(stringlen);
    m = key_alloc_mbuf(len);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        return NULL;
    }

    p = mtod(m, struct sadb_ident *);

    bzero(p, len);
    p->sadb_ident_len = PFKEY_UNIT64(len);
    p->sadb_ident_exttype = exttype;
    p->sadb_ident_type = idtype;
    p->sadb_ident_reserved = 0;
    p->sadb_ident_id = id;

    bcopy(string,
        mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_ident)),
        stringlen);

    return m;
}
#endif

/*
 * set data into sadb_x_sa2.
 */
static struct mbuf *
key_setsadbxsa2(mode, seq, reqid)
    u_int8_t mode;
    u_int32_t seq, reqid;
{
    struct mbuf *m;
    struct sadb_x_sa2 *p;
    size_t len;

    len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
    m = key_alloc_mbuf(len);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        return NULL;
    }

    p = mtod(m, struct sadb_x_sa2 *);

    bzero(p, len);
    p->sadb_x_sa2_len = PFKEY_UNIT64(len);
    p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
    p->sadb_x_sa2_mode = mode;
    p->sadb_x_sa2_reserved1 = 0;
    p->sadb_x_sa2_reserved2 = 0;
    p->sadb_x_sa2_sequence = seq;
    p->sadb_x_sa2_reqid = reqid;

    return m;
}

/*
 * set data into sadb_lifetime
 */
static struct mbuf *
key_setsadblifetime(type, alloc, bytes, addtime, usetime)
    u_int16_t type;
    u_int32_t alloc;
    u_int64_t bytes, addtime, usetime;
{
    struct mbuf *m;
    struct sadb_lifetime *p;
    size_t len;

    len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime));
    m = key_alloc_mbuf(len);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        return NULL;
    }

    p = mtod(m, struct sadb_lifetime *);

    bzero(p, len);
    p->sadb_lifetime_len = PFKEY_UNIT64(len);
    p->sadb_lifetime_exttype = type;
    p->sadb_lifetime_allocations = alloc;
    p->sadb_lifetime_bytes = bytes;
    p->sadb_lifetime_addtime = addtime;
    p->sadb_lifetime_usetime = usetime;

    return m;
}

/*
 * set data into sadb_x_policy
 */
static struct mbuf *
key_setsadbxpolicy(type, dir, id)
    u_int16_t type;
    u_int8_t dir;
    u_int32_t id;
{
    struct mbuf *m;
    struct sadb_x_policy *p;
    size_t len;

    len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
    m = key_alloc_mbuf(len);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        return NULL;
    }

    p = mtod(m, struct sadb_x_policy *);

    bzero(p, len);
    p->sadb_x_policy_len = PFKEY_UNIT64(len);
    p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
    p->sadb_x_policy_type = type;
    p->sadb_x_policy_dir = dir;
    p->sadb_x_policy_id = id;

    return m;
}

/* %%% utilities */
/*
 * copy a buffer into the new buffer allocated.
 */
static void *
key_newbuf(src, len)
    const void *src;
    u_int len;
{
    caddr_t new;

    KMALLOC(new, caddr_t, len);
    if (new == NULL) {
        ipseclog((LOG_DEBUG, "key_newbuf: No more memory.\n"));
        return NULL;
    }
    bcopy(src, new, len);

    return new;
}

/* compare my own address
 * OUT:    1: true, i.e. my address.
 *    0: false
 */
static int
key_ismyaddr(sa)
    struct sockaddr *sa;
{
#ifdef INET
    struct sockaddr_in *sin;
    struct in_ifaddr *ia;
#endif

    /* sanity check */
    if (sa == NULL)
        panic("key_ismyaddr: NULL pointer is passed.");

    switch (sa->sa_family) {
#ifdef INET
    case AF_INET:
        sin = (struct sockaddr_in *)sa;
        for (ia = in_ifaddrhead.tqh_first; ia;
             ia = ia->ia_link.tqe_next)
        {
            if (sin->sin_family == ia->ia_addr.sin_family &&
                sin->sin_len == ia->ia_addr.sin_len &&
                sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
            {
                return 1;
            }
        }
        break;
#endif
#ifdef INET6
    case AF_INET6:
        return key_ismyaddr6((struct sockaddr_in6 *)sa);
#endif
    }

    return 0;
}

#ifdef INET6
/*
 * compare my own address for IPv6.
 * 1: ours
 * 0: other
 * NOTE: derived ip6_input() in KAME. This is necessary to modify more.
 */
#include <netinet6/in6_var.h>

static int
key_ismyaddr6(sin6)
    struct sockaddr_in6 *sin6;
{
    struct in6_ifaddr *ia;
    struct in6_multi *in6m;

    for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
        if (key_sockaddrcmp((struct sockaddr *)&sin6,
            (struct sockaddr *)&ia->ia_addr, 0) == 0)
            return 1;

        /*
         * XXX Multicast
         * XXX why do we care about multlicast here while we don't care
         * about IPv4 multicast??
         */
        in6m = NULL;
        IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m);
        if (in6m)
            return 1;
    }

    /* loopback, just for safety */
    if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
        return 1;

    return 0;
}
#endif /*INET6*/

/*
 * compare two secasindex structure.
 * flag can specify to compare 2 saidxes.
 * compare two secasindex structure without both mode and reqid.
 * don't compare port.
 * IN:
 *      saidx0: source, it can be in SAD.
 *      saidx1: object.
 * OUT:
 *      1 : equal
 *      0 : not equal
 */
static int
key_cmpsaidx(saidx0, saidx1, flag)
    struct secasindex *saidx0, *saidx1;
    int flag;
{
    /* sanity */
    if (saidx0 == NULL && saidx1 == NULL)
        return 1;

    if (saidx0 == NULL || saidx1 == NULL)
        return 0;

    if (saidx0->proto != saidx1->proto)
        return 0;

    if (flag == CMP_EXACTLY) {
        if (saidx0->mode != saidx1->mode)
            return 0;
        if (saidx0->reqid != saidx1->reqid)
            return 0;
        if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.ss_len) != 0 ||
            bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.ss_len) != 0)
            return 0;
    } else {

        /* CMP_MODE_REQID, CMP_HEAD */
        if (flag == CMP_MODE_REQID) {
            /*
             * If reqid of SPD is non-zero, unique SA is required.
             * The result must be of same reqid in this case.
             */
            if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid)
                return 0;
        }

        if (flag == CMP_MODE_REQID) {
            if (saidx0->mode != IPSEC_MODE_ANY &&
                saidx0->mode != saidx1->mode)
                return 0;
        }

        if (key_sockaddrcmp((struct sockaddr *)&saidx0->src,
                (struct sockaddr *)&saidx1->src, 0) != 0) {
            return 0;
        }
        if (key_sockaddrcmp((struct sockaddr *)&saidx0->dst,
                (struct sockaddr *)&saidx1->dst, 0) != 0) {
            return 0;
        }
    }

    return 1;
}

/*
 * compare two secindex structure exactly.
 * IN:
 *    spidx0: source, it is often in SPD.
 *    spidx1: object, it is often from PFKEY message.
 * OUT:
 *    1 : equal
 *    0 : not equal
 */
int
key_cmpspidx_exactly(spidx0, spidx1)
    struct secpolicyindex *spidx0, *spidx1;
{
    /* sanity */
    if (spidx0 == NULL && spidx1 == NULL)
        return 1;

    if (spidx0 == NULL || spidx1 == NULL)
        return 0;

    if (spidx0->prefs != spidx1->prefs || spidx0->prefd != spidx1->prefd ||
        spidx0->ul_proto != spidx1->ul_proto)
        return 0;

    if (key_sockaddrcmp((struct sockaddr *)&spidx0->src,
        (struct sockaddr *)&spidx1->src, 1) != 0) {
        return 0;
    }
    if (key_sockaddrcmp((struct sockaddr *)&spidx0->dst,
        (struct sockaddr *)&spidx1->dst, 1) != 0) {
        return 0;
    }

    return 1;
}

/*
 * compare two secindex structure with mask.
 * IN:
 *    spidx0: source, it is often in SPD.
 *    spidx1: object, it is often from IP header.
 * OUT:
 *    1 : equal
 *    0 : not equal
 */
int
key_cmpspidx_withmask(spidx0, spidx1)
    struct secpolicyindex *spidx0, *spidx1;
{
    /* sanity */
    if (spidx0 == NULL && spidx1 == NULL)
        return 1;

    if (spidx0 == NULL || spidx1 == NULL)
        return 0;

    if (spidx0->src.ss_family != spidx1->src.ss_family ||
        spidx0->dst.ss_family != spidx1->dst.ss_family ||
        spidx0->src.ss_len != spidx1->src.ss_len ||
        spidx0->dst.ss_len != spidx1->dst.ss_len)
        return 0;

    /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
    if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY &&
        spidx0->ul_proto != spidx1->ul_proto)
        return 0;

    switch (spidx0->src.ss_family) {
    case AF_INET:
        if (satosin(&spidx0->src)->sin_port != IPSEC_PORT_ANY &&
            satosin(&spidx0->src)->sin_port !=
            satosin(&spidx1->src)->sin_port)
            return 0;
        if (!key_bbcmp((caddr_t)&satosin(&spidx0->src)->sin_addr,
            (caddr_t)&satosin(&spidx1->src)->sin_addr, spidx0->prefs))
            return 0;
        break;
    case AF_INET6:
        if (satosin6(&spidx0->src)->sin6_port != IPSEC_PORT_ANY &&
            satosin6(&spidx0->src)->sin6_port !=
            satosin6(&spidx1->src)->sin6_port)
            return 0;
        /*
         * scope_id check. if sin6_scope_id is 0, we regard it
         * as a wildcard scope, which matches any scope zone ID.
         */
        if (satosin6(&spidx0->src)->sin6_scope_id &&
            satosin6(&spidx1->src)->sin6_scope_id &&
            satosin6(&spidx0->src)->sin6_scope_id !=
            satosin6(&spidx1->src)->sin6_scope_id)
            return 0;
        if (!key_bbcmp((caddr_t)&satosin6(&spidx0->src)->sin6_addr,
            (caddr_t)&satosin6(&spidx1->src)->sin6_addr, spidx0->prefs))
            return 0;
        break;
    default:
        /* XXX */
        if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.ss_len) != 0)
            return 0;
        break;
    }

    switch (spidx0->dst.ss_family) {
    case AF_INET:
        if (satosin(&spidx0->dst)->sin_port != IPSEC_PORT_ANY &&
            satosin(&spidx0->dst)->sin_port !=
            satosin(&spidx1->dst)->sin_port)
            return 0;
        if (!key_bbcmp((caddr_t)&satosin(&spidx0->dst)->sin_addr,
            (caddr_t)&satosin(&spidx1->dst)->sin_addr, spidx0->prefd))
            return 0;
        break;
    case AF_INET6:
        if (satosin6(&spidx0->dst)->sin6_port != IPSEC_PORT_ANY &&
            satosin6(&spidx0->dst)->sin6_port !=
            satosin6(&spidx1->dst)->sin6_port)
            return 0;
        /*
         * scope_id check. if sin6_scope_id is 0, we regard it
         * as a wildcard scope, which matches any scope zone ID.
         */
        if (satosin6(&spidx0->src)->sin6_scope_id &&
            satosin6(&spidx1->src)->sin6_scope_id &&
            satosin6(&spidx0->dst)->sin6_scope_id !=
            satosin6(&spidx1->dst)->sin6_scope_id)
            return 0;
        if (!key_bbcmp((caddr_t)&satosin6(&spidx0->dst)->sin6_addr,
            (caddr_t)&satosin6(&spidx1->dst)->sin6_addr, spidx0->prefd))
            return 0;
        break;
    default:
        /* XXX */
        if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.ss_len) != 0)
            return 0;
        break;
    }

    /* XXX Do we check other field ?  e.g. flowinfo */

    return 1;
}

/* returns 0 on match */
static int
key_sockaddrcmp(sa1, sa2, port)
    struct sockaddr *sa1;
    struct sockaddr *sa2;
    int port;
{
    if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
        return 1;

    switch (sa1->sa_family) {
    case AF_INET:
        if (sa1->sa_len != sizeof(struct sockaddr_in))
            return 1;
        if (satosin(sa1)->sin_addr.s_addr !=
            satosin(sa2)->sin_addr.s_addr) {
            return 1;
        }
        if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
            return 1;
        break;
    case AF_INET6:
        if (sa1->sa_len != sizeof(struct sockaddr_in6))
            return 1;    /*EINVAL*/
        if (satosin6(sa1)->sin6_scope_id !=
            satosin6(sa2)->sin6_scope_id) {
            return 1;
        }
        if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
            &satosin6(sa2)->sin6_addr)) {
            return 1;
        }
        if (port &&
            satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
            return 1;
        }
        break;
    default:
        if (bcmp(sa1, sa2, sa1->sa_len) != 0)
            return 1;
        break;
    }

    return 0;
}

/*
 * compare two buffers with mask.
 * IN:
 *    addr1: source
 *    addr2: object
 *    bits:  Number of bits to compare
 * OUT:
 *    1 : equal
 *    0 : not equal
 */
static int
key_bbcmp(p1, p2, bits)
    caddr_t p1, p2;
    u_int bits;
{
    u_int8_t mask;

    /* XXX: This could be considerably faster if we compare a word
     * at a time, but it is complicated on LSB Endian machines */

    /* Handle null pointers */
    if (p1 == NULL || p2 == NULL)
        return (p1 == p2);

    while (bits >= 8) {
        if (*p1++ != *p2++)
            return 0;
        bits -= 8;
    }

    if (bits > 0) {
        mask = ~((1<<(8-bits))-1);
        if ((*p1 & mask) != (*p2 & mask))
            return 0;
    }
    return 1;    /* Match! */
}

/*
 * time handler.
 * scanning SPD and SAD to check status for each entries,
 * and do to remove or to expire.
 * XXX: year 2038 problem may remain.
 */
void
key_timehandler(arg)
    void *arg;
{
    u_int dir;
    int s;
    struct timeval tv;

    microtime(&tv);

    s = splnet();    /*called from softclock()*/

    /* SPD */
    {
    struct secpolicy *sp, *nextsp;

    for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
        for (sp = LIST_FIRST(&sptree[dir]);
             sp != NULL;
             sp = nextsp) {
            nextsp = LIST_NEXT(sp, chain);

            if (sp->state == IPSEC_SPSTATE_DEAD) {
                key_sp_unlink(sp);    /*XXX*/
                sp = NULL;
                continue;
            }

            if (sp->lifetime == 0 && sp->validtime == 0)
                continue;

            /* the deletion will occur next time */
            if ((sp->lifetime &&
                 tv.tv_sec - sp->created > sp->lifetime) ||
                (sp->validtime &&
                 tv.tv_sec - sp->lastused > sp->validtime)) {
                key_sp_dead(sp);
                key_spdexpire(sp);
                continue;
            }
        }
    }

    /* invalidate all cached SPD pointers on pcb */
    ipsec_invalpcbcacheall();
    }

    /* SAD */
    {
    struct secashead *sah, *nextsah;
    struct secasvar *sav, *nextsav;

    for (sah = LIST_FIRST(&sahtree);
         sah != NULL;
         sah = nextsah) {

        nextsah = LIST_NEXT(sah, chain);

        /* if sah has been dead, then delete it and process next sah. */
        if (sah->state == SADB_SASTATE_DEAD) {
            key_delsah(sah);
            continue;
        }

        /* if LARVAL entry doesn't become MATURE, delete it. */
        for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_LARVAL]);
             sav != NULL;
             sav = nextsav) {

            nextsav = LIST_NEXT(sav, chain);

            if (tv.tv_sec - sav->created > key_larval_lifetime) {
                key_freesav(sav);
            }
        }

        /*
         * check MATURE entry to start to send expire message
         * whether or not.
         */
        for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_MATURE]);
             sav != NULL;
             sav = nextsav) {

            nextsav = LIST_NEXT(sav, chain);

            /* we don't need to check. */
            if (sav->lft_s == NULL)
                continue;

            /* sanity check */
            if (sav->lft_c == NULL) {
                ipseclog((LOG_DEBUG, "key_timehandler: "
                    "There is no CURRENT time, why?\n"));
                continue;
            }

            /* check SOFT lifetime */
            if (sav->lft_s->sadb_lifetime_addtime != 0 &&
                tv.tv_sec - sav->created >
sav->lft_s->sadb_lifetime_addtime) {
                /*
                 * check the SA if it has been used.
                 * when it hasn't been used, delete it.
                 * i don't think such SA will be used.
                 */
                if (sav->lft_c->sadb_lifetime_usetime == 0) {
                    key_sa_chgstate(sav, SADB_SASTATE_DEAD);
                    key_freesav(sav);
                    sav = NULL;
                } else {
                    key_sa_chgstate(sav, SADB_SASTATE_DYING);
                    /*
                     * XXX If we keep to send expire
                     * message in the status of
                     * DYING. Do remove below code.
                     */
                    key_expire(sav);
                }
            }

            /* check SOFT lifetime by bytes */
            /*
             * XXX I don't know the way to delete this SA
             * when new SA is installed.  Caution when it's
             * installed too big lifetime by time.
             */
            else if (sav->lft_s->sadb_lifetime_bytes != 0
                  && sav->lft_s->sadb_lifetime_bytes <
sav->lft_c->sadb_lifetime_bytes) {

                key_sa_chgstate(sav, SADB_SASTATE_DYING);
                /*
                 * XXX If we keep to send expire
                 * message in the status of
                 * DYING. Do remove below code.
                 */
                key_expire(sav);
            }
        }

        /* check DYING entry to change status to DEAD. */
        for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_DYING]);
             sav != NULL;
             sav = nextsav) {

            nextsav = LIST_NEXT(sav, chain);

            /* we don't need to check. */
            if (sav->lft_h == NULL)
                continue;

            /* sanity check */
            if (sav->lft_c == NULL) {
                ipseclog((LOG_DEBUG, "key_timehandler: "
                    "There is no CURRENT time, why?\n"));
                continue;
            }

            if (sav->lft_h->sadb_lifetime_addtime != 0 &&
                tv.tv_sec - sav->created >
sav->lft_h->sadb_lifetime_addtime) {
                key_sa_chgstate(sav, SADB_SASTATE_DEAD);
                key_freesav(sav);
                sav = NULL;
            }
#if 0    /* XXX Should we keep to send expire message until HARD lifetime ?
*/
            else if (sav->lft_s != NULL
                  && sav->lft_s->sadb_lifetime_addtime != 0
                  && tv.tv_sec - sav->created >
sav->lft_s->sadb_lifetime_addtime) {
                /*
                 * XXX: should be checked to be
                 * installed the valid SA.
                 */

                /*
                 * If there is no SA then sending
                 * expire message.
                 */
                key_expire(sav);
            }
#endif
            /* check HARD lifetime by bytes */
            else if (sav->lft_h->sadb_lifetime_bytes != 0
                  && sav->lft_h->sadb_lifetime_bytes <
sav->lft_c->sadb_lifetime_bytes) {
                key_sa_chgstate(sav, SADB_SASTATE_DEAD);
                key_freesav(sav);
                sav = NULL;
            }
        }

        /* delete entry in DEAD */
        for (sav = LIST_FIRST(&sah->savtree[SADB_SASTATE_DEAD]);
             sav != NULL;
             sav = nextsav) {

            nextsav = LIST_NEXT(sav, chain);

            /* sanity check */
            if (sav->state != SADB_SASTATE_DEAD) {
                ipseclog((LOG_DEBUG, "key_timehandler: "
                    "invalid sav->state "
                    "(queue: %u SA: %u): "
                    "kill it anyway\n",
                    SADB_SASTATE_DEAD, sav->state));
            }

            /*
             * do not call key_freesav() here.
             * sav should already be freed, and sav->refcnt
             * shows other references to sav
             * (such as from SPD).
             */
        }
    }
    }

#ifndef IPSEC_NONBLOCK_ACQUIRE
    /* ACQ tree */
    {
    struct secacq *acq, *nextacq;

    for (acq = LIST_FIRST(&acqtree);
         acq != NULL;
         acq = nextacq) {

        nextacq = LIST_NEXT(acq, chain);

        if (tv.tv_sec - acq->created > key_blockacq_lifetime &&
            __LIST_CHAINED(acq)) {
            LIST_REMOVE(acq, chain);
            KFREE(acq);
        }
    }
    }
#endif

    /* SP ACQ tree */
    {
    struct secspacq *acq, *nextacq;

    for (acq = LIST_FIRST(&spacqtree);
         acq != NULL;
         acq = nextacq) {

        nextacq = LIST_NEXT(acq, chain);

        if (tv.tv_sec - acq->created > key_blockacq_lifetime &&
            __LIST_CHAINED(acq)) {
            LIST_REMOVE(acq, chain);
            KFREE(acq);
        }
    }
    }

    /*
     * should set timeout based on the most closest timer expiration.
     * we don't bother to do that yet.
     */
    callout_reset(&key_timehandler_ch, hz, key_timehandler, (void *)0);

    splx(s);
    return;
}

static u_long
key_random()
{
    u_long value;

    key_randomfill(&value, sizeof(value));
    return value;
}

void
key_randomfill(p, l)
    void *p;
    size_t l;
{
    size_t n;
    u_long v;
    static int warn = 1;

    n = 0;
    n = (size_t)read_random(p, (u_int)l);
    /* last resort */
    while (n < l) {
        v = random();
        bcopy(&v, (u_int8_t *)p + n,
            l - n < sizeof(v) ? l - n : sizeof(v));
        n += sizeof(v);

        if (warn) {
            printf("WARNING: pseudo-random number generator "
                "used for IPsec processing\n");
            warn = 0;
        }
    }
}

/*
 * map SADB_SATYPE_* to IPPROTO_*.
 * if satype == SADB_SATYPE then satype is mapped to ~0.
 * OUT:
 *    0: invalid satype.
 */
static u_int16_t
key_satype2proto(satype)
    u_int8_t satype;
{
    switch (satype) {
    case SADB_SATYPE_UNSPEC:
        return IPSEC_PROTO_ANY;
    case SADB_SATYPE_AH:
        return IPPROTO_AH;
    case SADB_SATYPE_ESP:
        return IPPROTO_ESP;
    case SADB_X_SATYPE_IPCOMP:
        return IPPROTO_IPCOMP;
    case SADB_X_SATYPE_TCPSIGNATURE:
        return IPPROTO_TCP;
    default:
        return 0;
    }
    /* NOTREACHED */
}

/*
 * map IPPROTO_* to SADB_SATYPE_*
 * OUT:
 *    0: invalid protocol type.
 */
static u_int8_t
key_proto2satype(proto)
    u_int16_t proto;
{
    switch (proto) {
    case IPPROTO_AH:
        return SADB_SATYPE_AH;
    case IPPROTO_ESP:
        return SADB_SATYPE_ESP;
    case IPPROTO_IPCOMP:
        return SADB_X_SATYPE_IPCOMP;
    case IPPROTO_TCP:
        return SADB_X_SATYPE_TCPSIGNATURE;
    default:
        return 0;
    }
    /* NOTREACHED */
}

/* %%% PF_KEY */
/*
 * SADB_GETSPI processing is to receive
 *    <base, (SA2), src address, dst address, (SPI range)>
 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
 * tree with the status of LARVAL, and send
 *    <base, SA(*), address(SD)>
 * to the IKMPd.
 *
 * IN:    mhp: pointer to the pointer to each header.
 * OUT:    NULL if fail.
 *    other if success, return pointer to the message to send.
 */
static int
key_getspi(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_address *src0, *dst0;
    struct secasindex saidx;
    struct secashead *newsah;
    struct secasvar *newsav;
    u_int8_t proto;
    u_int32_t spi;
    u_int8_t mode;
    u_int32_t reqid;
    int error;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_getspi: NULL pointer is passed.");

    if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
        ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
        ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
        mode = ((struct sadb_x_sa2
*)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
        reqid = ((struct sadb_x_sa2
*)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
    } else {
        mode = IPSEC_MODE_ANY;
        reqid = 0;
    }

    src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
    dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);

    /* map satype to proto */
    if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
        ipseclog((LOG_DEBUG, "key_getspi: invalid satype is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    /* make sure if port number is zero. */
    switch (((struct sockaddr *)(src0 + 1))->sa_family) {
    case AF_INET:
        if (((struct sockaddr *)(src0 + 1))->sa_len !=
            sizeof(struct sockaddr_in))
            return key_senderror(so, m, EINVAL);
        ((struct sockaddr_in *)(src0 + 1))->sin_port = 0;
        break;
    case AF_INET6:
        if (((struct sockaddr *)(src0 + 1))->sa_len !=
            sizeof(struct sockaddr_in6))
            return key_senderror(so, m, EINVAL);
        ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0;
        break;
    default:
        ; /*???*/
    }
    switch (((struct sockaddr *)(dst0 + 1))->sa_family) {
    case AF_INET:
        if (((struct sockaddr *)(dst0 + 1))->sa_len !=
            sizeof(struct sockaddr_in))
            return key_senderror(so, m, EINVAL);
        ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0;
        break;
    case AF_INET6:
        if (((struct sockaddr *)(dst0 + 1))->sa_len !=
            sizeof(struct sockaddr_in6))
            return key_senderror(so, m, EINVAL);
        ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0;
        break;
    default:
        ; /*???*/
    }

    /* XXX boundary check against sa_len */
    KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);

    /* SPI allocation */
    spi = key_do_getnewspi((struct sadb_spirange
*)mhp->ext[SADB_EXT_SPIRANGE],
                           &saidx);
    if (spi == 0)
        return key_senderror(so, m, EINVAL);

    /* get a SA index */
    if ((newsah = key_getsah(&saidx)) == NULL) {
        /* create a new SA index */
        if ((newsah = key_newsah(&saidx)) == NULL) {
            ipseclog((LOG_DEBUG, "key_getspi: No more memory.\n"));
            return key_senderror(so, m, ENOBUFS);
        }
    }

    /* get a new SA */
    /* XXX rewrite */
    newsav = key_newsav(m, mhp, newsah, &error);
    if (newsav == NULL) {
        /* XXX don't free new SA index allocated in above. */
        return key_senderror(so, m, error);
    }

    /* set spi */
    key_setspi(newsav, htonl(spi));

#ifndef IPSEC_NONBLOCK_ACQUIRE
    /* delete the entry in acqtree */
    if (mhp->msg->sadb_msg_seq != 0) {
        struct secacq *acq;
        if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) {
            /* reset counter in order to deletion by timehandler. */
            acq->created = time_second;
            acq->count = 0;
        }
        }
#endif

    {
    struct mbuf *n, *nn;
    struct sadb_sa *m_sa;
    struct sadb_msg *newmsg;
    int off, len;

    /* create new sadb_msg to reply. */
    len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
        PFKEY_ALIGN8(sizeof(struct sadb_sa));
    if (len > MCLBYTES)
        return key_senderror(so, m, ENOBUFS);

    MGETHDR(n, M_DONTWAIT, MT_DATA);
    if (len > MHLEN) {
        MCLGET(n, M_DONTWAIT);
        if ((n->m_flags & M_EXT) == 0) {
            m_freem(n);
            n = NULL;
        }
    }
    if (!n)
        return key_senderror(so, m, ENOBUFS);

    n->m_len = len;
    n->m_next = NULL;
    off = 0;

    m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
    off += PFKEY_ALIGN8(sizeof(struct sadb_msg));

    m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
    m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
    m_sa->sadb_sa_exttype = SADB_EXT_SA;
    m_sa->sadb_sa_spi = htonl(spi);
    off += PFKEY_ALIGN8(sizeof(struct sadb_sa));

#ifdef DIAGNOSTIC
    if (off != len)
        panic("length inconsistency in key_getspi");
#endif

    n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
        SADB_EXT_ADDRESS_DST);
    if (!n->m_next) {
        m_freem(n);
        return key_senderror(so, m, ENOBUFS);
    }

    if (n->m_len < sizeof(struct sadb_msg)) {
        n = m_pullup(n, sizeof(struct sadb_msg));
        if (n == NULL)
            return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
    }

    n->m_pkthdr.len = 0;
    for (nn = n; nn; nn = nn->m_next)
        n->m_pkthdr.len += nn->m_len;

    newmsg = mtod(n, struct sadb_msg *);
    newmsg->sadb_msg_seq = newsav->seq;
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
    }
}

/*
 * allocating new SPI
 * called by key_getspi().
 * OUT:
 *    0:    failure.
 *    others: success.
 */
static u_int32_t
key_do_getnewspi(spirange, saidx)
    struct sadb_spirange *spirange;
    struct secasindex *saidx;
{
    u_int32_t newspi;
    u_int32_t min, max;
    int count = key_spi_trycnt;

    /* set spi range to allocate */
    if (spirange != NULL) {
        min = spirange->sadb_spirange_min;
        max = spirange->sadb_spirange_max;
    } else {
        min = key_spi_minval;
        max = key_spi_maxval;
    }
    /* IPCOMP needs 2-byte SPI */
    if (saidx->proto == IPPROTO_IPCOMP) {
        u_int32_t t;
        if (min >= 0x10000)
            min = 0xffff;
        if (max >= 0x10000)
            max = 0xffff;
        if (min > max) {
            t = min; min = max; max = t;
        }
    }

    if (min == max) {
        if (key_checkspidup(saidx, min) != NULL) {
            ipseclog((LOG_DEBUG, "key_do_getnewspi: SPI %u exists
already.\n", min));
            return 0;
        }

        count--; /* taking one cost. */
        newspi = min;

    } else {

        /* init SPI */
        newspi = 0;

        /* when requesting to allocate spi ranged */
        while (count--) {
            /* generate pseudo-random SPI value ranged. */
            newspi = min + (key_random() % (max - min + 1));

            if (key_checkspidup(saidx, newspi) == NULL)
                break;
        }

        if (count == 0 || newspi == 0) {
            ipseclog((LOG_DEBUG, "key_do_getnewspi: to allocate spi is
failed.\n"));
            return 0;
        }
    }

    /* statistics */
    keystat.getspi_count =
        (keystat.getspi_count + key_spi_trycnt - count) / 2;

    return newspi;
}

/*
 * SADB_UPDATE processing
 * receive
 *   <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
 *       key(AE), (identity(SD),) (sensitivity)>
 * from the ikmpd, and update a secasvar entry whose status is
SADB_SASTATE_LARVAL.
 * and send
 *   <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
 *       (identity(SD),) (sensitivity)>
 * to the ikmpd.
 *
 * m will always be freed.
 */
static int
key_update(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_sa *sa0;
    struct sadb_address *src0, *dst0;
    struct secasindex saidx;
    struct secashead *sah;
    struct secasvar *sav;
    u_int16_t proto;
    u_int8_t mode;
    u_int32_t reqid;
    int error;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_update: NULL pointer is passed.");

    /* map satype to proto */
    if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
        ipseclog((LOG_DEBUG, "key_update: invalid satype is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    if (mhp->ext[SADB_EXT_SA] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
        (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
         mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
        (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
         mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
        (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
         mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
        (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
         mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
        ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
        mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
        ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
        mode = ((struct sadb_x_sa2
*)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
        reqid = ((struct sadb_x_sa2
*)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
    } else {
        mode = IPSEC_MODE_ANY;
        reqid = 0;
    }
    /* XXX boundary checking for other extensions */

    sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
    src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
    dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);

    /* XXX boundary check against sa_len */
    KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);

    /* get a SA header */
    if ((sah = key_getsah(&saidx)) == NULL) {
        ipseclog((LOG_DEBUG, "key_update: no SA index found.\n"));
        return key_senderror(so, m, ENOENT);
    }

    /* set spidx if there */
    /* XXX rewrite */
    error = key_setident(sah, m, mhp);
    if (error)
        return key_senderror(so, m, error);

    /* find a SA with sequence number. */
#ifdef IPSEC_DOSEQCHECK
    if (mhp->msg->sadb_msg_seq != 0 &&
        (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) {
        ipseclog((LOG_DEBUG,
            "key_update: no larval SA with sequence %u exists.\n",
            mhp->msg->sadb_msg_seq));
        return key_senderror(so, m, ENOENT);
    }
#else
    if ((sav = key_getsavbyspi(sah, sa0->sadb_sa_spi)) == NULL) {
        ipseclog((LOG_DEBUG,
            "key_update: no such a SA found (spi:%u)\n",
            (u_int32_t)ntohl(sa0->sadb_sa_spi)));
        return key_senderror(so, m, EINVAL);
    }
#endif

    /* validity check */
    if (sav->sah->saidx.proto != proto) {
        ipseclog((LOG_DEBUG,
            "key_update: protocol mismatched (DB=%u param=%u)\n",
            sav->sah->saidx.proto, proto));
        return key_senderror(so, m, EINVAL);
    }
#ifdef IPSEC_DOSEQCHECK
    if (sav->spi != sa0->sadb_sa_spi) {
        ipseclog((LOG_DEBUG,
            "key_update: SPI mismatched (DB:%u param:%u)\n",
            (u_int32_t)ntohl(sav->spi),
            (u_int32_t)ntohl(sa0->sadb_sa_spi)));
        return key_senderror(so, m, EINVAL);
    }
#endif
    if (sav->pid != mhp->msg->sadb_msg_pid) {
        ipseclog((LOG_DEBUG,
            "key_update: pid mismatched (DB:%u param:%u)\n",
            sav->pid, mhp->msg->sadb_msg_pid));
        return key_senderror(so, m, EINVAL);
    }

    /* copy sav values */
    error = key_setsaval(sav, m, mhp);
    if (error) {
        key_freesav(sav);
        return key_senderror(so, m, error);
    }

    /* check SA values to be mature. */
    if ((error = key_mature(sav)) != 0) {
        key_freesav(sav);
        return key_senderror(so, m, error);
    }

    {
    struct mbuf *n;

    /* set msg buf from mhp */
    n = key_getmsgbuf_x1(m, mhp);
    if (n == NULL) {
        ipseclog((LOG_DEBUG, "key_update: No more memory.\n"));
        return key_senderror(so, m, ENOBUFS);
    }

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
    }
}

/*
 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL.
 * only called by key_update().
 * OUT:
 *    NULL    : not found
 *    others    : found, pointer to a SA.
 */
#ifdef IPSEC_DOSEQCHECK
static struct secasvar *
key_getsavbyseq(sah, seq)
    struct secashead *sah;
    u_int32_t seq;
{
    struct secasvar *sav;
    u_int state;

    state = SADB_SASTATE_LARVAL;

    /* search SAD with sequence number ? */
    LIST_FOREACH(sav, &sah->savtree[state], chain) {

        KEY_CHKSASTATE(state, sav->state, "key_getsabyseq");

        if (sav->seq == seq) {
            sav->refcnt++;
            KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
                printf("DP key_getsavbyseq cause "
                    "refcnt++:%d SA:%p\n",
                    sav->refcnt, sav));
            return sav;
        }
    }

    return NULL;
}
#endif

/*
 * SADB_ADD processing
 * add an entry to SA database, when received
 *   <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
 *       key(AE), (identity(SD),) (sensitivity)>
 * from the ikmpd,
 * and send
 *   <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
 *       (identity(SD),) (sensitivity)>
 * to the ikmpd.
 *
 * IGNORE identity and sensitivity messages.
 *
 * m will always be freed.
 */
static int
key_add(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_sa *sa0;
    struct sadb_address *src0, *dst0;
    struct secasindex saidx;
    struct secashead *newsah;
    struct secasvar *newsav;
    u_int16_t proto;
    u_int8_t mode;
    u_int32_t reqid;
    int error;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_add: NULL pointer is passed.");

    /* map satype to proto */
    if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
        ipseclog((LOG_DEBUG, "key_add: invalid satype is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    if (mhp->ext[SADB_EXT_SA] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
        (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
         mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
        (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
         mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
        (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
         mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
        (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
         mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
        ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
        mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
        /* XXX need more */
        ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
        mode = ((struct sadb_x_sa2
*)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
        reqid = ((struct sadb_x_sa2
*)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
    } else {
        mode = IPSEC_MODE_ANY;
        reqid = 0;
    }

    sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
    src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
    dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];

    /* XXX boundary check against sa_len */
    KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);

    /* get a SA header */
    if ((newsah = key_getsah(&saidx)) == NULL) {
        /* create a new SA header */
        if ((newsah = key_newsah(&saidx)) == NULL) {
            ipseclog((LOG_DEBUG, "key_add: No more memory.\n"));
            return key_senderror(so, m, ENOBUFS);
        }
    }

    /* set spidx if there */
    /* XXX rewrite */
    error = key_setident(newsah, m, mhp);
    if (error) {
        return key_senderror(so, m, error);
    }

    /* create new SA entry. */
    /* We can create new SA only if SPI is differenct. */
    if (key_getsavbyspi(newsah, sa0->sadb_sa_spi)) {
        ipseclog((LOG_DEBUG, "key_add: SA already exists.\n"));
        return key_senderror(so, m, EEXIST);
    }
    newsav = key_newsav(m, mhp, newsah, &error);
    if (newsav == NULL) {
        return key_senderror(so, m, error);
    }

    /* check SA values to be mature. */
    if ((error = key_mature(newsav)) != 0) {
        key_freesav(newsav);
        return key_senderror(so, m, error);
    }

    /*
     * don't call key_freesav() here, as we would like to keep the SA
     * in the database on success.
     */

    {
    struct mbuf *n;

    /* set msg buf from mhp */
    n = key_getmsgbuf_x1(m, mhp);
    if (n == NULL) {
        ipseclog((LOG_DEBUG, "key_update: No more memory.\n"));
        return key_senderror(so, m, ENOBUFS);
    }

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
    }
}

/* m is retained */
static int
key_setident(sah, m, mhp)
    struct secashead *sah;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    const struct sadb_ident *idsrc, *iddst;
    int idsrclen, iddstlen;

    /* sanity check */
    if (sah == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_setident: NULL pointer is passed.");

    /* don't make buffer if not there */
    if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL &&
        mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
        sah->idents = NULL;
        sah->identd = NULL;
        return 0;
    }

    if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL ||
        mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
        ipseclog((LOG_DEBUG, "key_setident: invalid identity.\n"));
        return EINVAL;
    }

    idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
    iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
    idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC];
    iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST];

    /* validity check */
    if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
        ipseclog((LOG_DEBUG, "key_setident: ident type mismatch.\n"));
        return EINVAL;
    }

    switch (idsrc->sadb_ident_type) {
    case SADB_IDENTTYPE_PREFIX:
    case SADB_IDENTTYPE_FQDN:
    case SADB_IDENTTYPE_USERFQDN:
    default:
        /* XXX do nothing */
        sah->idents = NULL;
        sah->identd = NULL;
         return 0;
    }

    /* make structure */
    KMALLOC(sah->idents, struct sadb_ident *, idsrclen);
    if (sah->idents == NULL) {
        ipseclog((LOG_DEBUG, "key_setident: No more memory.\n"));
        return ENOBUFS;
    }
    KMALLOC(sah->identd, struct sadb_ident *, iddstlen);
    if (sah->identd == NULL) {
        KFREE(sah->idents);
        sah->idents = NULL;
        ipseclog((LOG_DEBUG, "key_setident: No more memory.\n"));
        return ENOBUFS;
    }
    bcopy(idsrc, sah->idents, idsrclen);
    bcopy(iddst, sah->identd, iddstlen);

    return 0;
}

/*
 * m will not be freed on return.
 * it is caller's responsibility to free the result.
 */
static struct mbuf *
key_getmsgbuf_x1(m, mhp)
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct mbuf *n;

    /* sanity check */
    if (m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_getmsgbuf_x1: NULL pointer is passed.");

    /* create new sadb_msg to reply. */
    n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED,
        SADB_EXT_SA, SADB_X_EXT_SA2,
        SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
        SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
        SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST);
    if (!n)
        return NULL;

    if (n->m_len < sizeof(struct sadb_msg)) {
        n = m_pullup(n, sizeof(struct sadb_msg));
        if (n == NULL)
            return NULL;
    }
    mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
    mtod(n, struct sadb_msg *)->sadb_msg_len =
        PFKEY_UNIT64(n->m_pkthdr.len);

    return n;
}

static int key_delete_all(struct socket *, struct mbuf *,
    const struct sadb_msghdr *, u_int16_t);

/*
 * SADB_DELETE processing
 * receive
 *   <base, SA(*), address(SD)>
 * from the ikmpd, and set SADB_SASTATE_DEAD,
 * and send,
 *   <base, SA(*), address(SD)>
 * to the ikmpd.
 *
 * m will always be freed.
 */
static int
key_delete(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_sa *sa0;
    struct sadb_address *src0, *dst0;
    struct secasindex saidx;
    struct secashead *sah;
    struct secasvar *sav = NULL;
    u_int16_t proto;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_delete: NULL pointer is passed.");

    /* map satype to proto */
    if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
        ipseclog((LOG_DEBUG, "key_delete: invalid satype is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
        ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
        ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    if (mhp->ext[SADB_EXT_SA] == NULL) {
        /*
         * Caller wants us to delete all non-LARVAL SAs
         * that match the src/dst.  This is used during
         * IKE INITIAL-CONTACT.
         */
        ipseclog((LOG_DEBUG, "key_delete: doing delete all.\n"));
        return key_delete_all(so, m, mhp, proto);
    } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) {
        ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
    src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
    dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);

    /* XXX boundary check against sa_len */
    KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);

    /* get a SA header */
    LIST_FOREACH(sah, &sahtree, chain) {
        if (sah->state == SADB_SASTATE_DEAD)
            continue;
        if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
            continue;

        /* get a SA with SPI. */
        sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
        if (sav)
            break;
    }
    if (sah == NULL) {
        ipseclog((LOG_DEBUG, "key_delete: no SA found.\n"));
        return key_senderror(so, m, ENOENT);
    }

    key_sa_chgstate(sav, SADB_SASTATE_DEAD);
    key_freesav(sav);
    sav = NULL;

    {
    struct mbuf *n;
    struct sadb_msg *newmsg;

    /* create new sadb_msg to reply. */
    n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
        SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
    if (!n)
        return key_senderror(so, m, ENOBUFS);

    if (n->m_len < sizeof(struct sadb_msg)) {
        n = m_pullup(n, sizeof(struct sadb_msg));
        if (n == NULL)
            return key_senderror(so, m, ENOBUFS);
    }
    newmsg = mtod(n, struct sadb_msg *);
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
    }
}

/*
 * delete all SAs for src/dst.  Called from key_delete().
 */
static int
key_delete_all(so, m, mhp, proto)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
    u_int16_t proto;
{
    struct sadb_address *src0, *dst0;
    struct secasindex saidx;
    struct secashead *sah;
    struct secasvar *sav, *nextsav;
    u_int stateidx, state;

    src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
    dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);

    /* XXX boundary check against sa_len */
    KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);

    LIST_FOREACH(sah, &sahtree, chain) {
        if (sah->state == SADB_SASTATE_DEAD)
            continue;
        if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
            continue;

        /* Delete all non-LARVAL SAs. */
        for (stateidx = 0;
             stateidx < _ARRAYLEN(saorder_state_alive);
             stateidx++) {
            state = saorder_state_alive[stateidx];
            if (state == SADB_SASTATE_LARVAL)
                continue;
            for (sav = LIST_FIRST(&sah->savtree[state]);
                 sav != NULL; sav = nextsav) {
                nextsav = LIST_NEXT(sav, chain);
                /* sanity check */
                if (sav->state != state) {
                    ipseclog((LOG_DEBUG, "key_delete_all: "
                           "invalid sav->state "
                           "(queue: %u SA: %u)\n",
                           state, sav->state));
                    continue;
                }

                key_sa_chgstate(sav, SADB_SASTATE_DEAD);
                key_freesav(sav);
            }
        }
    }
    {
    struct mbuf *n;
    struct sadb_msg *newmsg;

    /* create new sadb_msg to reply. */
    n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
        SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
    if (!n)
        return key_senderror(so, m, ENOBUFS);

    if (n->m_len < sizeof(struct sadb_msg)) {
        n = m_pullup(n, sizeof(struct sadb_msg));
        if (n == NULL)
            return key_senderror(so, m, ENOBUFS);
    }
    newmsg = mtod(n, struct sadb_msg *);
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
    }
}

/*
 * SADB_GET processing
 * receive
 *   <base, SA(*), address(SD)>
 * from the ikmpd, and get a SP and a SA to respond,
 * and send,
 *   <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
 *       (identity(SD),) (sensitivity)>
 * to the ikmpd.
 *
 * m will always be freed.
 */
static int
key_get(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_sa *sa0;
    struct sadb_address *src0, *dst0;
    struct secasindex saidx;
    struct secashead *sah;
    struct secasvar *sav = NULL;
    u_int16_t proto;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_get: NULL pointer is passed.");

    /* map satype to proto */
    if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
        ipseclog((LOG_DEBUG, "key_get: invalid satype is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    if (mhp->ext[SADB_EXT_SA] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
        ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
        mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
        ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
    src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
    dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];

    /* XXX boundary check against sa_len */
    KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);

    /* get a SA header */
    LIST_FOREACH(sah, &sahtree, chain) {
        if (sah->state == SADB_SASTATE_DEAD)
            continue;
        if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
            continue;

        /* get a SA with SPI. */
        sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
        if (sav)
            break;
    }
    if (sah == NULL) {
        ipseclog((LOG_DEBUG, "key_get: no SA found.\n"));
        return key_senderror(so, m, ENOENT);
    }

    {
    struct mbuf *n;
    u_int8_t satype;

    /* map proto to satype */
    if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
        ipseclog((LOG_DEBUG, "key_get: there was invalid proto in SAD.\n"));
        return key_senderror(so, m, EINVAL);
    }

    /* create new sadb_msg to reply. */
    n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
        mhp->msg->sadb_msg_pid);
    if (!n)
        return key_senderror(so, m, ENOBUFS);

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
    }
}

/* XXX make it sysctl-configurable? */
static void
key_getcomb_setlifetime(comb)
    struct sadb_comb *comb;
{

    comb->sadb_comb_soft_allocations = 1;
    comb->sadb_comb_hard_allocations = 1;
    comb->sadb_comb_soft_bytes = 0;
    comb->sadb_comb_hard_bytes = 0;
    comb->sadb_comb_hard_addtime = 86400;    /* 1 day */
    comb->sadb_comb_soft_addtime = comb->sadb_comb_hard_addtime * 80 / 100;
    comb->sadb_comb_hard_usetime = 28800;    /* 8 hours */
    comb->sadb_comb_soft_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
}

#ifdef IPSEC_ESP
/*
 * XXX reorder combinations by preference
 * XXX no idea if the user wants ESP authentication or not
 */
static struct mbuf *
key_getcomb_esp()
{
    struct sadb_comb *comb;
    const struct esp_algorithm *algo;
    struct mbuf *result = NULL, *m, *n;
    int encmin;
    int i, off, o;
    int totlen;
    const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));

    m = NULL;
    for (i = 1; i <= SADB_EALG_MAX; i++) {
        algo = esp_algorithm_lookup(i);
        if (!algo)
            continue;

        if (algo->keymax < ipsec_esp_keymin)
            continue;
        if (algo->keymin < ipsec_esp_keymin)
            encmin = ipsec_esp_keymin;
        else
            encmin = algo->keymin;

        if (ipsec_esp_auth)
            m = key_getcomb_ah();
        else {
#ifdef DIAGNOSTIC
            if (l > MLEN)
                panic("assumption failed in key_getcomb_esp");
#endif
            MGET(m, M_DONTWAIT, MT_DATA);
            if (m) {
                M_ALIGN(m, l);
                m->m_len = l;
                m->m_next = NULL;
                bzero(mtod(m, caddr_t), m->m_len);
            }
        }
        if (!m)
            goto fail;

        totlen = 0;
        for (n = m; n; n = n->m_next)
            totlen += n->m_len;
#ifdef DIAGNOSTIC
        if (totlen % l)
            panic("assumption failed in key_getcomb_esp");
#endif

        for (off = 0; off < totlen; off += l) {
            n = m_pulldown(m, off, l, &o);
            if (!n) {
                /* m is already freed */
                goto fail;
            }
            comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
            bzero(comb, sizeof(*comb));
            key_getcomb_setlifetime(comb);
            comb->sadb_comb_encrypt = i;
            comb->sadb_comb_encrypt_minbits = encmin;
            comb->sadb_comb_encrypt_maxbits = algo->keymax;
        }

        if (!result)
            result = m;
        else
            m_cat(result, m);
    }

    return result;

 fail:
    if (result)
        m_freem(result);
    return NULL;
}
#endif

/*
 * XXX reorder combinations by preference
 */
static struct mbuf *
key_getcomb_ah()
{
    struct sadb_comb *comb;
    const struct ah_algorithm *algo;
    struct mbuf *m;
    int min;
    int i;
    const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));

    m = NULL;
    for (i = 1; i <= SADB_AALG_MAX; i++) {
#if 1
        /* we prefer HMAC algorithms, not old algorithms */
        if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC)
            continue;
#endif
        algo = ah_algorithm_lookup(i);
        if (!algo)
            continue;

        if (algo->keymax < ipsec_ah_keymin)
            continue;
        if (algo->keymin < ipsec_ah_keymin)
            min = ipsec_ah_keymin;
        else
            min = algo->keymin;

        if (!m) {
#ifdef DIAGNOSTIC
            if (l > MLEN)
                panic("assumption failed in key_getcomb_ah");
#endif
            MGET(m, M_DONTWAIT, MT_DATA);
            if (m) {
                M_ALIGN(m, l);
                m->m_len = l;
                m->m_next = NULL;
            }
        } else
            M_PREPEND(m, l, M_DONTWAIT);
        if (!m)
            return NULL;

        comb = mtod(m, struct sadb_comb *);
        bzero(comb, sizeof(*comb));
        key_getcomb_setlifetime(comb);
        comb->sadb_comb_auth = i;
        comb->sadb_comb_auth_minbits = min;
        comb->sadb_comb_auth_maxbits = algo->keymax;
    }

    return m;
}

/*
 * not really an official behavior.  discussed in pf_key@inner.net in
Sep2000.
 * XXX reorder combinations by preference
 */
static struct mbuf *
key_getcomb_ipcomp()
{
    struct sadb_comb *comb;
    const struct ipcomp_algorithm *algo;
    struct mbuf *m;
    int i;
    const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));

    m = NULL;
    for (i = 1; i <= SADB_X_CALG_MAX; i++) {
        algo = ipcomp_algorithm_lookup(i);
        if (!algo)
            continue;

        if (!m) {
#ifdef DIAGNOSTIC
            if (l > MLEN)
                panic("assumption failed in key_getcomb_ipcomp");
#endif
            MGET(m, M_DONTWAIT, MT_DATA);
            if (m) {
                M_ALIGN(m, l);
                m->m_len = l;
                m->m_next = NULL;
            }
        } else
            M_PREPEND(m, l, M_DONTWAIT);
        if (!m)
            return NULL;

        comb = mtod(m, struct sadb_comb *);
        bzero(comb, sizeof(*comb));
        key_getcomb_setlifetime(comb);
        comb->sadb_comb_encrypt = i;
        /* what should we set into sadb_comb_*_{min,max}bits? */
    }

    return m;
}

/*
 * XXX no way to pass mode (transport/tunnel) to userland
 * XXX replay checking?
 * XXX sysctl interface to ipsec_{ah,esp}_keymin
 */
static struct mbuf *
key_getprop(saidx)
    const struct secasindex *saidx;
{
    struct sadb_prop *prop;
    struct mbuf *m, *n;
    const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
    int totlen;

    switch (saidx->proto)  {
#ifdef IPSEC_ESP
    case IPPROTO_ESP:
        m = key_getcomb_esp();
        break;
#endif
    case IPPROTO_AH:
        m = key_getcomb_ah();
        break;
    case IPPROTO_IPCOMP:
        m = key_getcomb_ipcomp();
        break;
    default:
        return NULL;
    }

    if (!m)
        return NULL;
    M_PREPEND(m, l, M_DONTWAIT);
    if (!m)
        return NULL;

    totlen = 0;
    for (n = m; n; n = n->m_next)
        totlen += n->m_len;

    prop = mtod(m, struct sadb_prop *);
    bzero(prop, sizeof(*prop));
    prop->sadb_prop_len = PFKEY_UNIT64(totlen);
    prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
    prop->sadb_prop_replay = 32;    /* XXX */

    return m;
}

/*
 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
 * send
 *   <base, SA, address(SD), (address(P)), x_policy,
 *       (identity(SD),) (sensitivity,) proposal>
 * to KMD, and expect to receive
 *   <base> with SADB_ACQUIRE if error occured,
 * or
 *   <base, src address, dst address, (SPI range)> with SADB_GETSPI
 * from KMD by PF_KEY.
 *
 * XXX x_policy is outside of RFC2367 (KAME extension).
 * XXX sensitivity is not supported.
 * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
 * see comment for key_getcomb_ipcomp().
 *
 * OUT:
 *    0     : succeed
 *    others: error number
 */
static int
key_acquire(saidx, sp)
    struct secasindex *saidx;
    struct secpolicy *sp;
{
    struct mbuf *result = NULL, *m;
#ifndef IPSEC_NONBLOCK_ACQUIRE
    struct secacq *newacq;
#endif
    u_int8_t satype;
    int error = -1;
    u_int32_t seq;

    /* sanity check */
    if (saidx == NULL)
        panic("key_acquire: NULL pointer is passed.");
    if ((satype = key_proto2satype(saidx->proto)) == 0)
        panic("key_acquire: invalid proto is passed.");

#ifndef IPSEC_NONBLOCK_ACQUIRE
    /*
     * We never do anything about acquirng SA.  There is anather
     * solution that kernel blocks to send SADB_ACQUIRE message until
     * getting something message from IKEd.  In later case, to be
     * managed with ACQUIRING list.
     */
    /* get an entry to check whether sending message or not. */
    if ((newacq = key_getacq(saidx)) != NULL) {
        if (key_blockacq_count < newacq->count) {
            /* reset counter and do send message. */
            newacq->count = 0;
        } else {
            /* increment counter and do nothing. */
            newacq->count++;
            return 0;
        }
    } else {
        /* make new entry for blocking to send SADB_ACQUIRE. */
        if ((newacq = key_newacq(saidx)) == NULL)
            return ENOBUFS;

        /* add to acqtree */
        LIST_INSERT_HEAD(&acqtree, newacq, chain);
    }
#endif


#ifndef IPSEC_NONBLOCK_ACQUIRE
    seq = newacq->seq;
#else
    seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
#endif
    m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    result = m;

    /* set sadb_address for saidx's. */
    m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
        (struct sockaddr *)&saidx->src, FULLMASK, IPSEC_ULPROTO_ANY);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    m_cat(result, m);

    m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
        (struct sockaddr *)&saidx->dst, FULLMASK, IPSEC_ULPROTO_ANY);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    m_cat(result, m);

    /* XXX proxy address (optional) */

    /* set sadb_x_policy */
    if (sp) {
        m = key_setsadbxpolicy(sp->policy, sp->dir, sp->id);
        if (!m) {
            error = ENOBUFS;
            goto fail;
        }
        m_cat(result, m);
    }

    /* XXX identity (optional) */
#if 0
    if (idexttype && fqdn) {
        /* create identity extension (FQDN) */
        struct sadb_ident *id;
        int fqdnlen;

        fqdnlen = strlen(fqdn) + 1;    /* +1 for terminating-NUL */
        id = (struct sadb_ident *)p;
        bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
        id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) +
PFKEY_ALIGN8(fqdnlen));
        id->sadb_ident_exttype = idexttype;
        id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
        bcopy(fqdn, id + 1, fqdnlen);
        p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
    }

    if (idexttype) {
        /* create identity extension (USERFQDN) */
        struct sadb_ident *id;
        int userfqdnlen;

        if (userfqdn) {
            /* +1 for terminating-NUL */
            userfqdnlen = strlen(userfqdn) + 1;
        } else
            userfqdnlen = 0;
        id = (struct sadb_ident *)p;
        bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
        id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) +
PFKEY_ALIGN8(userfqdnlen));
        id->sadb_ident_exttype = idexttype;
        id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
        /* XXX is it correct? */
        if (curproc && curproc->p_cred)
            id->sadb_ident_id = curproc->p_cred->p_ruid;
        if (userfqdn && userfqdnlen)
            bcopy(userfqdn, id + 1, userfqdnlen);
        p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
    }
#endif

    /* XXX sensitivity (optional) */

    /* create proposal/combination extension */
    m = key_getprop(saidx);
#if 0
    /*
     * spec conformant: always attach proposal/combination extension,
     * the problem is that we have no way to attach it for ipcomp,
     * due to the way sadb_comb is declared in RFC2367.
     */
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    m_cat(result, m);
#else
    /*
     * outside of spec; make proposal/combination extension optional.
     */
    if (m)
        m_cat(result, m);
#endif

    if ((result->m_flags & M_PKTHDR) == 0) {
        error = EINVAL;
        goto fail;
    }

    if (result->m_len < sizeof(struct sadb_msg)) {
        result = m_pullup(result, sizeof(struct sadb_msg));
        if (result == NULL) {
            error = ENOBUFS;
            goto fail;
        }
    }

    result->m_pkthdr.len = 0;
    for (m = result; m; m = m->m_next)
        result->m_pkthdr.len += m->m_len;

    mtod(result, struct sadb_msg *)->sadb_msg_len =
        PFKEY_UNIT64(result->m_pkthdr.len);

    return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);

 fail:
    if (result)
        m_freem(result);
    return error;
}

#ifndef IPSEC_NONBLOCK_ACQUIRE
static struct secacq *
key_newacq(saidx)
    struct secasindex *saidx;
{
    struct secacq *newacq;

    /* get new entry */
    KMALLOC(newacq, struct secacq *, sizeof(struct secacq));
    if (newacq == NULL) {
        ipseclog((LOG_DEBUG, "key_newacq: No more memory.\n"));
        return NULL;
    }
    bzero(newacq, sizeof(*newacq));

    /* copy secindex */
    bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx));
    newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq);
    newacq->created = time_second;
    newacq->count = 0;

    return newacq;
}

static struct secacq *
key_getacq(saidx)
    struct secasindex *saidx;
{
    struct secacq *acq;

    LIST_FOREACH(acq, &acqtree, chain) {
        if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY))
            return acq;
    }

    return NULL;
}

static struct secacq *
key_getacqbyseq(seq)
    u_int32_t seq;
{
    struct secacq *acq;

    LIST_FOREACH(acq, &acqtree, chain) {
        if (acq->seq == seq)
            return acq;
    }

    return NULL;
}
#endif

static struct secspacq *
key_newspacq(spidx)
    struct secpolicyindex *spidx;
{
    struct secspacq *acq;

    if (!spidx)
        return NULL;

    /* get new entry */
    KMALLOC(acq, struct secspacq *, sizeof(struct secspacq));
    if (acq == NULL) {
        ipseclog((LOG_DEBUG, "key_newspacq: No more memory.\n"));
        return NULL;
    }
    bzero(acq, sizeof(*acq));

    /* copy secindex */
    bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
    acq->created = time_second;
    acq->count = 1;

    return acq;
}

static struct secspacq *
key_getspacq(spidx)
    struct secpolicyindex *spidx;
{
    struct secspacq *acq;

    if (!spidx)
        return NULL;

    LIST_FOREACH(acq, &spacqtree, chain) {
        if (key_cmpspidx_exactly(spidx, &acq->spidx))
            return acq;
    }

    return NULL;
}

/*
 * SADB_ACQUIRE processing,
 * in first situation, is receiving
 *   <base>
 * from the ikmpd, and clear sequence of its secasvar entry.
 *
 * In second situation, is receiving
 *   <base, address(SD), (address(P),) (identity(SD),) (sensitivity,)
proposal>
 * from a user land process, and return
 *   <base, address(SD), (address(P),) (identity(SD),) (sensitivity,)
proposal>
 * to the socket.
 *
 * m will always be freed.
 */
static int
key_acquire2(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_address *src0, *dst0;
    struct secasindex saidx;
    struct secashead *sah;
    u_int16_t proto;
    int error;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_acquire2: NULL pointer is passed.");

    /*
     * Error message from KMd.
     * We assume that if error was occured in IKEd, the length of PFKEY
     * message is equal to the size of sadb_msg structure.
     * We do not raise error even if error occured in this function.
     */
    if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
#ifndef IPSEC_NONBLOCK_ACQUIRE
        struct secacq *acq;

        /* check sequence number */
        if (mhp->msg->sadb_msg_seq == 0) {
            ipseclog((LOG_DEBUG, "key_acquire2: must specify sequence
number.\n"));
            m_freem(m);
            return 0;
        }

        if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) {
            /*
             * the specified larval SA is already gone, or we got
             * a bogus sequence number.  we can silently ignore it.
             */
            m_freem(m);
            return 0;
        }

        /* reset acq counter in order to deletion by timehander. */
        acq->created = time_second;
        acq->count = 0;
#endif
        m_freem(m);
        return 0;
    }

    /*
     * This message is from user land.
     */

    /* map satype to proto */
    if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
        ipseclog((LOG_DEBUG, "key_acquire2: invalid satype is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
        mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
        mhp->ext[SADB_EXT_PROPOSAL] == NULL) {
        /* error */
        ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }
    if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
        mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) {
        /* error */
        ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
    dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];

    /* XXX boundary check against sa_len */
    KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);

    /* get a SA index */
    LIST_FOREACH(sah, &sahtree, chain) {
        if (sah->state == SADB_SASTATE_DEAD)
            continue;
        if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
            break;
    }
    if (sah != NULL) {
        ipseclog((LOG_DEBUG, "key_acquire2: a SA exists already.\n"));
        return key_senderror(so, m, EEXIST);
    }

    error = key_acquire(&saidx, NULL);
    if (error != 0) {
        ipseclog((LOG_DEBUG, "key_acquire2: error %d returned "
            "from key_acquire.\n", mhp->msg->sadb_msg_errno));
        return key_senderror(so, m, error);
    }

    return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED);
}

/*
 * SADB_REGISTER processing.
 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
 * receive
 *   <base>
 * from the ikmpd, and register a socket to send PF_KEY messages,
 * and send
 *   <base, supported>
 * to KMD by PF_KEY.
 * If socket is detached, must free from regnode.
 *
 * m will always be freed.
 */
static int
key_register(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct secreg *reg, *newreg = 0;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_register: NULL pointer is passed.");

    /* check for invalid register message */
    if (mhp->msg->sadb_msg_satype >= sizeof(regtree)/sizeof(regtree[0]))
        return key_senderror(so, m, EINVAL);

    /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
    if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
        goto setmsg;

    /* check whether existing or not */
    LIST_FOREACH(reg, &regtree[mhp->msg->sadb_msg_satype], chain) {
        if (reg->so == so) {
            ipseclog((LOG_DEBUG, "key_register: socket exists already.\n"));
            return key_senderror(so, m, EEXIST);
        }
    }

    /* create regnode */
    KMALLOC(newreg, struct secreg *, sizeof(*newreg));
    if (newreg == NULL) {
        ipseclog((LOG_DEBUG, "key_register: No more memory.\n"));
        return key_senderror(so, m, ENOBUFS);
    }
    bzero((caddr_t)newreg, sizeof(*newreg));

    newreg->so = so;
    ((struct keycb *)sotorawcb(so))->kp_registered++;

    /* add regnode to regtree. */
    LIST_INSERT_HEAD(&regtree[mhp->msg->sadb_msg_satype], newreg, chain);

  setmsg:
    {
    struct mbuf *n;
    struct sadb_msg *newmsg;
    struct sadb_supported *sup;
    u_int len, alen, elen;
    int off;
    int i;
    struct sadb_alg *alg;

    /* create new sadb_msg to reply. */
    alen = 0;
    for (i = 1; i <= SADB_AALG_MAX; i++) {
        if (ah_algorithm_lookup(i))
            alen += sizeof(struct sadb_alg);
    }
    if (alen)
        alen += sizeof(struct sadb_supported);
    elen = 0;
#ifdef IPSEC_ESP
    for (i = 1; i <= SADB_EALG_MAX; i++) {
        if (esp_algorithm_lookup(i))
            elen += sizeof(struct sadb_alg);
    }
    if (elen)
        elen += sizeof(struct sadb_supported);
#endif

    len = sizeof(struct sadb_msg) + alen + elen;

    if (len > MCLBYTES)
        return key_senderror(so, m, ENOBUFS);

    MGETHDR(n, M_DONTWAIT, MT_DATA);
    if (len > MHLEN) {
        MCLGET(n, M_DONTWAIT);
        if ((n->m_flags & M_EXT) == 0) {
            m_freem(n);
            n = NULL;
        }
    }
    if (!n)
        return key_senderror(so, m, ENOBUFS);

    n->m_pkthdr.len = n->m_len = len;
    n->m_next = NULL;
    off = 0;

    m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
    newmsg = mtod(n, struct sadb_msg *);
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(len);
    off += PFKEY_ALIGN8(sizeof(struct sadb_msg));

    /* for authentication algorithm */
    if (alen) {
        sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
        sup->sadb_supported_len = PFKEY_UNIT64(alen);
        sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
        off += PFKEY_ALIGN8(sizeof(*sup));

        for (i = 1; i <= SADB_AALG_MAX; i++) {
            const struct ah_algorithm *aalgo;

            aalgo = ah_algorithm_lookup(i);
            if (!aalgo)
                continue;
            alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
            alg->sadb_alg_id = i;
            alg->sadb_alg_ivlen = 0;
            alg->sadb_alg_minbits = aalgo->keymin;
            alg->sadb_alg_maxbits = aalgo->keymax;
            off += PFKEY_ALIGN8(sizeof(*alg));
        }
    }

#ifdef IPSEC_ESP
    /* for encryption algorithm */
    if (elen) {
        sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
        sup->sadb_supported_len = PFKEY_UNIT64(elen);
        sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
        off += PFKEY_ALIGN8(sizeof(*sup));

        for (i = 1; i <= SADB_EALG_MAX; i++) {
            const struct esp_algorithm *ealgo;

            ealgo = esp_algorithm_lookup(i);
            if (!ealgo)
                continue;
            alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
            alg->sadb_alg_id = i;
            if (ealgo && ealgo->ivlen) {
                /*
                 * give NULL to get the value preferred by
                 * algorithm XXX SADB_X_EXT_DERIV ?
                 */
                alg->sadb_alg_ivlen =
                    (*ealgo->ivlen)(ealgo, NULL);
            } else
                alg->sadb_alg_ivlen = 0;
            alg->sadb_alg_minbits = ealgo->keymin;
            alg->sadb_alg_maxbits = ealgo->keymax;
            off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
        }
    }
#endif

#ifdef DIGAGNOSTIC
    if (off != len)
        panic("length assumption failed in key_register");
#endif

    m_freem(m);
    return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
    }
}

/*
 * free secreg entry registered.
 * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
 */
void
key_freereg(so)
    struct socket *so;
{
    struct secreg *reg;
    int i;

    /* sanity check */
    if (so == NULL)
        panic("key_freereg: NULL pointer is passed.");

    /*
     * check whether existing or not.
     * check all type of SA, because there is a potential that
     * one socket is registered to multiple type of SA.
     */
    for (i = 0; i <= SADB_SATYPE_MAX; i++) {
        LIST_FOREACH(reg, &regtree[i], chain) {
            if (reg->so == so && __LIST_CHAINED(reg)) {
                LIST_REMOVE(reg, chain);
                KFREE(reg);
                break;
            }
        }
    }

    return;
}

/*
 * SADB_EXPIRE processing
 * send
 *   <base, SA, SA2, lifetime(C and one of HS), address(SD)>
 * to KMD by PF_KEY.
 * NOTE: We send only soft lifetime extension.
 *
 * OUT:    0    : succeed
 *    others    : error number
 */
static int
key_expire(sav)
    struct secasvar *sav;
{
    int s;
    int satype;
    struct mbuf *result = NULL, *m;
    int len;
    int error = -1;
    struct sadb_lifetime *lt;

    /* XXX: Why do we lock ? */
    s = splnet();    /*called from softclock()*/

    /* sanity check */
    if (sav == NULL)
        panic("key_expire: NULL pointer is passed.");
    if (sav->sah == NULL)
        panic("key_expire: Why was SA index in SA NULL.");
    if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0)
        panic("key_expire: invalid proto is passed.");

    /* set msg header */
    m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    result = m;

    /* create SA extension */
    m = key_setsadbsa(sav);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    m_cat(result, m);

    /* create SA extension */
    m = key_setsadbxsa2(sav->sah->saidx.mode,
        sav->replay ? (sav->replay->count & 0xffffffff) : 0,
        sav->sah->saidx.reqid);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    m_cat(result, m);

    /* create lifetime extension (current and soft) */
    len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
    m = key_alloc_mbuf(len);
    if (!m || m->m_next) {    /*XXX*/
        if (m)
            m_freem(m);
        error = ENOBUFS;
        goto fail;
    }
    bzero(mtod(m, caddr_t), len);
    lt = mtod(m, struct sadb_lifetime *);
    lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
    lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
    lt->sadb_lifetime_allocations = sav->lft_c->sadb_lifetime_allocations;
    lt->sadb_lifetime_bytes = sav->lft_c->sadb_lifetime_bytes;
    lt->sadb_lifetime_addtime = sav->lft_c->sadb_lifetime_addtime;
    lt->sadb_lifetime_usetime = sav->lft_c->sadb_lifetime_usetime;
    lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
    bcopy(sav->lft_s, lt, sizeof(*lt));
    m_cat(result, m);

    /* set sadb_address for source */
    m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
        (struct sockaddr *)&sav->sah->saidx.src,
        FULLMASK, IPSEC_ULPROTO_ANY);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    m_cat(result, m);

    /* set sadb_address for destination */
    m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
        (struct sockaddr *)&sav->sah->saidx.dst,
        FULLMASK, IPSEC_ULPROTO_ANY);
    if (!m) {
        error = ENOBUFS;
        goto fail;
    }
    m_cat(result, m);

    if ((result->m_flags & M_PKTHDR) == 0) {
        error = EINVAL;
        goto fail;
    }

    if (result->m_len < sizeof(struct sadb_msg)) {
        result = m_pullup(result, sizeof(struct sadb_msg));
        if (result == NULL) {
            error = ENOBUFS;
            goto fail;
        }
    }

    result->m_pkthdr.len = 0;
    for (m = result; m; m = m->m_next)
        result->m_pkthdr.len += m->m_len;

    mtod(result, struct sadb_msg *)->sadb_msg_len =
        PFKEY_UNIT64(result->m_pkthdr.len);

    splx(s);
    return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);

 fail:
    if (result)
        m_freem(result);
    splx(s);
    return error;
}

/*
 * SADB_FLUSH processing
 * receive
 *   <base>
 * from the ikmpd, and free all entries in secastree.
 * and send,
 *   <base>
 * to the ikmpd.
 * NOTE: to do is only marking SADB_SASTATE_DEAD.
 *
 * m will always be freed.
 */
static int
key_flush(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct sadb_msg *newmsg;
    struct secashead *sah, *nextsah;
    struct secasvar *sav, *nextsav;
    u_int16_t proto;
    u_int8_t state;
    u_int stateidx;

    /* sanity check */
    if (so == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_flush: NULL pointer is passed.");

    /* map satype to proto */
    if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
        ipseclog((LOG_DEBUG, "key_flush: invalid satype is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    /* no SATYPE specified, i.e. flushing all SA. */
    for (sah = LIST_FIRST(&sahtree); sah != NULL; sah = nextsah) {
        nextsah = LIST_NEXT(sah, chain);

        if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
            proto != sah->saidx.proto)
            continue;

        for (stateidx = 0;
             stateidx < _ARRAYLEN(saorder_state_alive);
             stateidx++) {
            state = saorder_state_any[stateidx];
            for (sav = LIST_FIRST(&sah->savtree[state]);
                 sav != NULL;
                 sav = nextsav) {

                nextsav = LIST_NEXT(sav, chain);

                key_sa_chgstate(sav, SADB_SASTATE_DEAD);
                key_freesav(sav);
            }
        }

        sah->state = SADB_SASTATE_DEAD;
    }

    if (m->m_len < sizeof(struct sadb_msg) ||
        sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
        ipseclog((LOG_DEBUG, "key_flush: No more memory.\n"));
        return key_senderror(so, m, ENOBUFS);
    }

    if (m->m_next)
        m_freem(m->m_next);
    m->m_next = NULL;
    m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
    newmsg = mtod(m, struct sadb_msg *);
    newmsg->sadb_msg_errno = 0;
    newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);

    return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
}

/*
 * SADB_DUMP processing
 * dump all entries including status of DEAD in SAD.
 * receive
 *   <base>
 * from the ikmpd, and dump all secasvar leaves
 * and send,
 *   <base> .....
 * to the ikmpd.
 *
 * m will always be freed.
 */
static int
key_dump(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    struct secashead *sah;
    struct secasvar *sav;
    u_int16_t proto;
    u_int stateidx;
    u_int8_t satype;
    u_int8_t state;
    int cnt;
    struct mbuf *n;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_dump: NULL pointer is passed.");

    /* map satype to proto */
    if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
        ipseclog((LOG_DEBUG, "key_dump: invalid satype is passed.\n"));
        return key_senderror(so, m, EINVAL);
    }

    /* count sav entries to be sent to the userland. */
    cnt = 0;
    LIST_FOREACH(sah, &sahtree, chain) {
        if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
            proto != sah->saidx.proto)
            continue;

        for (stateidx = 0;
             stateidx < _ARRAYLEN(saorder_state_any);
             stateidx++) {
            state = saorder_state_any[stateidx];
            LIST_FOREACH(sav, &sah->savtree[state], chain) {
                cnt++;
            }
        }
    }

    if (cnt == 0)
        return key_senderror(so, m, ENOENT);

    /* send this to the userland, one at a time. */
    LIST_FOREACH(sah, &sahtree, chain) {
        if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
            proto != sah->saidx.proto)
            continue;

        /* map proto to satype */
        if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
            ipseclog((LOG_DEBUG, "key_dump: there was invalid proto in
SAD.\n"));
            return key_senderror(so, m, EINVAL);
        }

        for (stateidx = 0;
             stateidx < _ARRAYLEN(saorder_state_any);
             stateidx++) {
            state = saorder_state_any[stateidx];
            LIST_FOREACH(sav, &sah->savtree[state], chain) {
                n = key_setdumpsa(sav, SADB_DUMP, satype,
                    --cnt, mhp->msg->sadb_msg_pid);
                if (!n)
                    return key_senderror(so, m, ENOBUFS);

                key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
            }
        }
    }

    m_freem(m);
    return 0;
}

/*
 * SADB_X_PROMISC processing
 *
 * m will always be freed.
 */
static int
key_promisc(so, m, mhp)
    struct socket *so;
    struct mbuf *m;
    const struct sadb_msghdr *mhp;
{
    int olen;

    /* sanity check */
    if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
        panic("key_promisc: NULL pointer is passed.");

    olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);

    if (olen < sizeof(struct sadb_msg)) {
#if 1
        return key_senderror(so, m, EINVAL);
#else
        m_freem(m);
        return 0;
#endif
    } else if (olen == sizeof(struct sadb_msg)) {
        /* enable/disable promisc mode */
        struct keycb *kp;

        if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
            return key_senderror(so, m, EINVAL);
        mhp->msg->sadb_msg_errno = 0;
        switch (mhp->msg->sadb_msg_satype) {
        case 0:
        case 1:
            kp->kp_promisc = mhp->msg->sadb_msg_satype;
            break;
        default:
            return key_senderror(so, m, EINVAL);
        }

        /* send the original message back to everyone */
        mhp->msg->sadb_msg_errno = 0;
        return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
    } else {
        /* send packet as is */

        m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));

        /* TODO: if sadb_msg_seq is specified, send to specific pid */
        return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
    }
}

static int (*key_typesw[])(struct socket *, struct mbuf *,
        const struct sadb_msghdr *) = {
    NULL,        /* SADB_RESERVED */
    key_getspi,    /* SADB_GETSPI */
    key_update,    /* SADB_UPDATE */
    key_add,    /* SADB_ADD */
    key_delete,    /* SADB_DELETE */
    key_get,    /* SADB_GET */
    key_acquire2,    /* SADB_ACQUIRE */
    key_register,    /* SADB_REGISTER */
    NULL,        /* SADB_EXPIRE */
    key_flush,    /* SADB_FLUSH */
    key_dump,    /* SADB_DUMP */
    key_promisc,    /* SADB_X_PROMISC */
    NULL,        /* SADB_X_PCHANGE */
    key_spdadd,    /* SADB_X_SPDUPDATE */
    key_spdadd,    /* SADB_X_SPDADD */
    key_spddelete,    /* SADB_X_SPDDELETE */
    key_spdget,    /* SADB_X_SPDGET */
    NULL,        /* SADB_X_SPDACQUIRE */
    key_spddump,    /* SADB_X_SPDDUMP */
    key_spdflush,    /* SADB_X_SPDFLUSH */
    key_spdadd,    /* SADB_X_SPDSETIDX */
    NULL,        /* SADB_X_SPDEXPIRE */
    key_spddelete2,    /* SADB_X_SPDDELETE2 */
};

/*
 * parse sadb_msg buffer to process PFKEYv2,
 * and create a data to response if needed.
 * I think to be dealed with mbuf directly.
 * IN:
 *     msgp  : pointer to pointer to a received buffer pulluped.
 *             This is rewrited to response.
 *     so    : pointer to socket.
 * OUT:
 *    length for buffer to send to user process.
 */
int
key_parse(m, so)
    struct mbuf *m;
    struct socket *so;
{
    struct sadb_msg *msg;
    struct sadb_msghdr mh;
    u_int orglen;
    int error;
    int target;

    /* sanity check */
    if (m == NULL || so == NULL)
        panic("key_parse: NULL pointer is passed.");

#if 0    /*kdebug_sadb assumes msg in linear buffer*/
    KEYDEBUG(KEYDEBUG_KEY_DUMP,
        ipseclog((LOG_DEBUG, "key_parse: passed sadb_msg\n"));
        kdebug_sadb(msg));
#endif

    if (m->m_len < sizeof(struct sadb_msg)) {
        m = m_pullup(m, sizeof(struct sadb_msg));
        if (!m)
            return ENOBUFS;
    }
    msg = mtod(m, struct sadb_msg *);
    orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
    target = KEY_SENDUP_ONE;

    if ((m->m_flags & M_PKTHDR) == 0 ||
        m->m_pkthdr.len != m->m_pkthdr.len) {
        ipseclog((LOG_DEBUG, "key_parse: invalid message length.\n"));
        pfkeystat.out_invlen++;
        error = EINVAL;
        goto senderror;
    }

    if (msg->sadb_msg_version != PF_KEY_V2) {
        ipseclog((LOG_DEBUG,
            "key_parse: PF_KEY version %u is mismatched.\n",
            msg->sadb_msg_version));
        pfkeystat.out_invver++;
        error = EINVAL;
        goto senderror;
    }

    if (msg->sadb_msg_type > SADB_MAX) {
        ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
            msg->sadb_msg_type));
        pfkeystat.out_invmsgtype++;
        error = EINVAL;
        goto senderror;
    }

    /* for old-fashioned code - should be nuked */
    if (m->m_pkthdr.len > MCLBYTES) {
        m_freem(m);
        return ENOBUFS;
    }
    if (m->m_next) {
        struct mbuf *n;

        MGETHDR(n, M_DONTWAIT, MT_DATA);
        if (n && m->m_pkthdr.len > MHLEN) {
            MCLGET(n, M_DONTWAIT);
            if ((n->m_flags & M_EXT) == 0) {
                m_free(n);
                n = NULL;
            }
        }
        if (!n) {
            m_freem(m);
            return ENOBUFS;
        }
        m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
        n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
        n->m_next = NULL;
        m_freem(m);
        m = n;
    }

    /* align the mbuf chain so that extensions are in contiguous region. */
    error = key_align(m, &mh);
    if (error)
        return error;

    msg = mh.msg;

    /* check SA type */
    switch (msg->sadb_msg_satype) {
    case SADB_SATYPE_UNSPEC:
        switch (msg->sadb_msg_type) {
        case SADB_GETSPI:
        case SADB_UPDATE:
        case SADB_ADD:
        case SADB_DELETE:
        case SADB_GET:
        case SADB_ACQUIRE:
        case SADB_EXPIRE:
            ipseclog((LOG_DEBUG, "key_parse: must specify satype "
                "when msg type=%u.\n", msg->sadb_msg_type));
            pfkeystat.out_invsatype++;
            error = EINVAL;
            goto senderror;
        }
        break;
    case SADB_SATYPE_AH:
    case SADB_SATYPE_ESP:
    case SADB_X_SATYPE_IPCOMP:
    case SADB_X_SATYPE_TCPSIGNATURE:
        switch (msg->sadb_msg_type) {
        case SADB_X_SPDADD:
        case SADB_X_SPDDELETE:
        case SADB_X_SPDGET:
        case SADB_X_SPDDUMP:
        case SADB_X_SPDFLUSH:
        case SADB_X_SPDSETIDX:
        case SADB_X_SPDUPDATE:
        case SADB_X_SPDDELETE2:
            ipseclog((LOG_DEBUG, "key_parse: illegal satype=%u\n",
                msg->sadb_msg_type));
            pfkeystat.out_invsatype++;
            error = EINVAL;
            goto senderror;
        }
        break;
    case SADB_SATYPE_RSVP:
    case SADB_SATYPE_OSPFV2:
    case SADB_SATYPE_RIPV2:
    case SADB_SATYPE_MIP:
        ipseclog((LOG_DEBUG, "key_parse: type %u isn't supported.\n",
            msg->sadb_msg_satype));
        pfkeystat.out_invsatype++;
        error = EOPNOTSUPP;
        goto senderror;
    case 1:    /* XXX: What does it do? */
        if (msg->sadb_msg_type == SADB_X_PROMISC)
            break;
        /*FALLTHROUGH*/
    default:
        ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
            msg->sadb_msg_satype));
        pfkeystat.out_invsatype++;
        error = EINVAL;
        goto senderror;
    }

    /* check field of upper layer protocol and address family */
    if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL &&
        mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
        struct sadb_address *src0, *dst0;
        u_int plen;

        src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
        dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);

        /* check upper layer protocol */
        if (src0->sadb_address_proto != dst0->sadb_address_proto) {
            ipseclog((LOG_DEBUG, "key_parse: upper layer protocol
mismatched.\n"));
            pfkeystat.out_invaddr++;
            error = EINVAL;
            goto senderror;
        }

        /* check family */
        if (PFKEY_ADDR_SADDR(src0)->sa_family !=
            PFKEY_ADDR_SADDR(dst0)->sa_family) {
            ipseclog((LOG_DEBUG, "key_parse: address family
mismatched.\n"));
            pfkeystat.out_invaddr++;
            error = EINVAL;
            goto senderror;
        }
        if (PFKEY_ADDR_SADDR(src0)->sa_len !=
            PFKEY_ADDR_SADDR(dst0)->sa_len) {
            ipseclog((LOG_DEBUG,
                "key_parse: address struct size mismatched.\n"));
            pfkeystat.out_invaddr++;
            error = EINVAL;
            goto senderror;
        }

        switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
        case AF_INET:
            if (PFKEY_ADDR_SADDR(src0)->sa_len !=
                sizeof(struct sockaddr_in)) {
                pfkeystat.out_invaddr++;
                error = EINVAL;
                goto senderror;
            }
            break;
        case AF_INET6:
            if (PFKEY_ADDR_SADDR(src0)->sa_len !=
                sizeof(struct sockaddr_in6)) {
                pfkeystat.out_invaddr++;
                error = EINVAL;
                goto senderror;
            }
            break;
        default:
            ipseclog((LOG_DEBUG,
                "key_parse: unsupported address family.\n"));
            pfkeystat.out_invaddr++;
            error = EAFNOSUPPORT;
            goto senderror;
        }

        switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
        case AF_INET:
            plen = sizeof(struct in_addr) << 3;
            break;
        case AF_INET6:
            plen = sizeof(struct in6_addr) << 3;
            break;
        default:
            plen = 0;    /*fool gcc*/
            break;
        }

        /* check max prefix length */
        if (src0->sadb_address_prefixlen > plen ||
            dst0->sadb_address_prefixlen > plen) {
            ipseclog((LOG_DEBUG,
                "key_parse: illegal prefixlen.\n"));
            pfkeystat.out_invaddr++;
            error = EINVAL;
            goto senderror;
        }

        /*
         * prefixlen == 0 is valid because there can be a case when
         * all addresses are matched.
         */
    }

    if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) ||
        key_typesw[msg->sadb_msg_type] == NULL) {
        pfkeystat.out_invmsgtype++;
        error = EINVAL;
        goto senderror;
    }

    return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);

senderror:
    msg->sadb_msg_errno = error;
    return key_sendup_mbuf(so, m, target);
}

static int
key_senderror(so, m, code)
    struct socket *so;
    struct mbuf *m;
    int code;
{
    struct sadb_msg *msg;

    if (m->m_len < sizeof(struct sadb_msg))
        panic("invalid mbuf passed to key_senderror");

    msg = mtod(m, struct sadb_msg *);
    msg->sadb_msg_errno = code;
    return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
}

/*
 * set the pointer to each header into message buffer.
 * m will be freed on error.
 * XXX larger-than-MCLBYTES extension?
 */
static int
key_align(m, mhp)
    struct mbuf *m;
    struct sadb_msghdr *mhp;
{
    struct mbuf *n;
    struct sadb_ext *ext;
    size_t off, end;
    int extlen;
    int toff;

    /* sanity check */
    if (m == NULL || mhp == NULL)
        panic("key_align: NULL pointer is passed.");
    if (m->m_len < sizeof(struct sadb_msg))
        panic("invalid mbuf passed to key_align");

    /* initialize */
    bzero(mhp, sizeof(*mhp));

    mhp->msg = mtod(m, struct sadb_msg *);
    mhp->ext[0] = (struct sadb_ext *)mhp->msg;    /*XXX backward compat */

    end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
    extlen = end;    /*just in case extlen is not updated*/
    for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
        n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
        if (!n) {
            /* m is already freed */
            return ENOBUFS;
        }
        ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);

        /* set pointer */
        switch (ext->sadb_ext_type) {
        case SADB_EXT_SA:
        case SADB_EXT_ADDRESS_SRC:
        case SADB_EXT_ADDRESS_DST:
        case SADB_EXT_ADDRESS_PROXY:
        case SADB_EXT_LIFETIME_CURRENT:
        case SADB_EXT_LIFETIME_HARD:
        case SADB_EXT_LIFETIME_SOFT:
        case SADB_EXT_KEY_AUTH:
        case SADB_EXT_KEY_ENCRYPT:
        case SADB_EXT_IDENTITY_SRC:
        case SADB_EXT_IDENTITY_DST:
        case SADB_EXT_SENSITIVITY:
        case SADB_EXT_PROPOSAL:
        case SADB_EXT_SUPPORTED_AUTH:
        case SADB_EXT_SUPPORTED_ENCRYPT:
        case SADB_EXT_SPIRANGE:
        case SADB_X_EXT_POLICY:
        case SADB_X_EXT_SA2:
            /* duplicate check */
            /*
             * XXX Are there duplication payloads of either
             * KEY_AUTH or KEY_ENCRYPT ?
             */
            if (mhp->ext[ext->sadb_ext_type] != NULL) {
                ipseclog((LOG_DEBUG,
                    "key_align: duplicate ext_type %u "
                    "is passed.\n", ext->sadb_ext_type));
                m_freem(m);
                pfkeystat.out_dupext++;
                return EINVAL;
            }
            break;
        default:
            ipseclog((LOG_DEBUG,
                "key_align: invalid ext_type %u is passed.\n",
                ext->sadb_ext_type));
            m_freem(m);
            pfkeystat.out_invexttype++;
            return EINVAL;
        }

        extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);

        if (key_validate_ext(ext, extlen)) {
            m_freem(m);
            pfkeystat.out_invlen++;
            return EINVAL;
        }

        n = m_pulldown(m, off, extlen, &toff);
        if (!n) {
            /* m is already freed */
            return ENOBUFS;
        }
        ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);

        mhp->ext[ext->sadb_ext_type] = ext;
        mhp->extoff[ext->sadb_ext_type] = off;
        mhp->extlen[ext->sadb_ext_type] = extlen;
    }

    if (off != end) {
        m_freem(m);
        pfkeystat.out_invlen++;
        return EINVAL;
    }

    return 0;
}

static int
key_validate_ext(ext, len)
    struct sadb_ext *ext;
    int len;
{
    struct sockaddr *sa;
    enum { NONE, ADDR } checktype = NONE;
    int baselen = 0;
    const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);

    if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
        return EINVAL;

    /* if it does not match minimum/maximum length, bail */
    if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) ||
        ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0]))
        return EINVAL;
    if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
        return EINVAL;
    if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
        return EINVAL;

    /* more checks based on sadb_ext_type XXX need more */
    switch (ext->sadb_ext_type) {
    case SADB_EXT_ADDRESS_SRC:
    case SADB_EXT_ADDRESS_DST:
    case SADB_EXT_ADDRESS_PROXY:
        baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
        checktype = ADDR;
        break;
    case SADB_EXT_IDENTITY_SRC:
    case SADB_EXT_IDENTITY_DST:
        if (((struct sadb_ident *)ext)->sadb_ident_type ==
            SADB_X_IDENTTYPE_ADDR) {
            baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
            checktype = ADDR;
        } else
            checktype = NONE;
        break;
    default:
        checktype = NONE;
        break;
    }

    switch (checktype) {
    case NONE:
        break;
    case ADDR:
        sa = (struct sockaddr *)((caddr_t)ext + baselen);
        if (len < baselen + sal)
            return EINVAL;
        if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
            return EINVAL;
        break;
    }

    return 0;
}

void
key_init()
{
    int i;

    bzero((caddr_t)&key_cb, sizeof(key_cb));

    callout_init(&key_timehandler_ch, 0);

    for (i = 0; i < IPSEC_DIR_MAX; i++)
        LIST_INIT(&sptree[i]);

    LIST_INIT(&sahtree);

    for (i = 0; i <= SADB_SATYPE_MAX; i++)
        LIST_INIT(&regtree[i]);

    for (i = 0; i < SPIHASHSIZE; i++)
        LIST_INIT(&spihash[i]);

#ifndef IPSEC_NONBLOCK_ACQUIRE
    LIST_INIT(&acqtree);
#endif
    LIST_INIT(&spacqtree);

    TAILQ_INIT(&satailq);
    TAILQ_INIT(&sptailq);

    /* system default */
#ifdef INET
    ip4_def_policy = key_newsp(0);
    if (!ip4_def_policy)
        panic("could not initialize IPv4 default security policy");
    ip4_def_policy->state = IPSEC_SPSTATE_ALIVE;
    ip4_def_policy->policy = IPSEC_POLICY_NONE;
    ip4_def_policy->dir = IPSEC_DIR_ANY;
    ip4_def_policy->readonly = 1;
    ip4_def_policy->persist = 1;
#endif
#ifdef INET6
    ip6_def_policy = key_newsp(0);
    if (!ip6_def_policy)
        panic("could not initialize IPv6 default security policy");
    ip6_def_policy->state = IPSEC_SPSTATE_ALIVE;
    ip6_def_policy->policy = IPSEC_POLICY_NONE;
    ip6_def_policy->dir = IPSEC_DIR_ANY;
    ip6_def_policy->readonly = 1;
    ip6_def_policy->persist = 1;
#endif

    callout_reset(&key_timehandler_ch, hz, key_timehandler, (void *)0);

    /* initialize key statistics */
    keystat.getspi_count = 1;

    printf("IPsec: Initialized Security Association Processing.\n");

    return;
}

/*
 * XXX: maybe This function is called after INBOUND IPsec processing.
 *
 * Special check for tunnel-mode packets.
 * We must make some checks for consistency between inner and outer IP
header.
 *
 * xxx more checks to be provided
 */
int
key_checktunnelsanity(sav, family, src, dst)
    struct secasvar *sav;
    u_int family;
    caddr_t src;
    caddr_t dst;
{
    /* sanity check */
    if (sav->sah == NULL)
        panic("sav->sah == NULL at key_checktunnelsanity");

    /* XXX: check inner IP header */

    return 1;
}

#if 0
/*
 * Get FQDN for the host.
 * If the administrator configured hostname (by hostname(1)) without
 * domain name, returns nothing.
 */
static const char *
key_getfqdn()
{
    int i;
    int hasdot;
    static char fqdn[MAXHOSTNAMELEN + 1];
    int hostnamelen = strlen(hostname);

    if (!hostnamelen)
        return NULL;

    /* check if it comes with domain name. */
    hasdot = 0;
    for (i = 0; i < hostnamelen; i++) {
        if (hostname[i] == '.')
            hasdot++;
    }
    if (!hasdot)
        return NULL;

    /* NOTE: hostname may not be NUL-terminated. */
    bzero(fqdn, sizeof(fqdn));
    bcopy(hostname, fqdn, hostnamelen);
    fqdn[hostnamelen] = '\0';
    return fqdn;
}

/*
 * get username@FQDN for the host/user.
 */
static const char *
key_getuserfqdn()
{
    const char *host;
    static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2];
    struct proc *p = curproc;
    char *q;

    PROC_LOCK(p);
    if (!p || !p->p_pgrp || !p->p_pgrp->pg_session) {
        PROC_UNLOCK(p);
        return NULL;
    }
    if (!(host = key_getfqdn())) {
        PROC_UNLOCK(p);
        return NULL;
    }

    /* NOTE: s_login may not be-NUL terminated. */
    bzero(userfqdn, sizeof(userfqdn));
    SESS_LOCK(p->p_session);
    bcopy(p->p_pgrp->pg_session->s_login, userfqdn, MAXLOGNAME);
    SESS_UNLOCK(p->p_session);
    PROC_UNLOCK(p);
    userfqdn[MAXLOGNAME] = '\0';    /* safeguard */
    q = userfqdn + strlen(userfqdn);
    *q++ = '@';
    bcopy(host, q, strlen(host));
    q += strlen(host);
    *q++ = '\0';

    return userfqdn;
}
#endif

/* record data transfer on SA, and update timestamps */
void
key_sa_recordxfer(sav, m)
    struct secasvar *sav;
    struct mbuf *m;
{
    if (!sav)
        panic("key_sa_recordxfer called with sav == NULL");
    if (!m)
        panic("key_sa_recordxfer called with m == NULL");
    if (!sav->lft_c)
        return;

    /*
     * XXX Currently, there is a difference of bytes size
     * between inbound and outbound processing.
     */
    sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len;
    /* to check bytes lifetime is done in key_timehandler(). */

    /*
     * We use the number of packets as the unit of
     * sadb_lifetime_allocations.  We increment the variable
     * whenever {esp,ah}_{in,out}put is called.
     */
    sav->lft_c->sadb_lifetime_allocations++;
    /* XXX check for expires? */

    /*
     * NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock,
     * in seconds.  HARD and SOFT lifetime are measured by the time
     * difference (again in seconds) from sadb_lifetime_usetime.
     *
     *    usetime
     *    v     expire   expire
     * -----+-----+--------+---> t
     *    <--------------> HARD
     *    <-----> SOFT
     */
    {
    sav->lft_c->sadb_lifetime_usetime = time_second;
    /* XXX check for expires? */
    }

    return;
}

/* dumb version */
void
key_sa_routechange(dst)
    struct sockaddr *dst;
{
    struct secashead *sah;
    struct route *ro;

    LIST_FOREACH(sah, &sahtree, chain) {
        ro = &sah->sa_route;
        if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len &&
            bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) {
            RTFREE(ro->ro_rt);
            ro->ro_rt = (struct rtentry *)NULL;
        }
    }

    return;
}

static void
key_sa_chgstate(sav, state)
    struct secasvar *sav;
    u_int8_t state;
{
    if (sav == NULL)
        panic("key_sa_chgstate called with sav == NULL");

    if (sav->state == state)
        return;

    if (__LIST_CHAINED(sav))
        LIST_REMOVE(sav, chain);

    sav->state = state;
    LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain);
}

void
key_sa_stir_iv(sav)
    struct secasvar *sav;
{

    if (!sav->iv)
        panic("key_sa_stir_iv called with sav == NULL");
    key_randomfill(sav->iv, sav->ivlen);
}

static void
key_sp_dead(sp)
    struct secpolicy *sp;
{

    /* mark the SP dead */
    sp->state = IPSEC_SPSTATE_DEAD;
}

static void
key_sp_unlink(sp)
    struct secpolicy *sp;
{

    /* remove from SP index */
    if (__LIST_CHAINED(sp)) {
        LIST_REMOVE(sp, chain);
        key_freesp(sp);
    }
}

/* XXX too much? */
static struct mbuf *
key_alloc_mbuf(l)
    int l;
{
    struct mbuf *m = NULL, *n;
    int len, t;

    len = l;
    while (len > 0) {
        MGET(n, M_DONTWAIT, MT_DATA);
        if (n && len > MLEN)
            MCLGET(n, M_DONTWAIT);
        if (!n) {
            m_freem(m);
            return NULL;
        }

        n->m_next = NULL;
        n->m_len = 0;
        n->m_len = M_TRAILINGSPACE(n);
        /* use the bottom of mbuf, hoping we can prepend afterwards */
        if (n->m_len > len) {
            t = (n->m_len - len) & ~(sizeof(long) - 1);
            n->m_data += t;
            n->m_len = len;
        }

        len -= n->m_len;

        if (m)
            m_cat(m, n);
        else
            m = n;
    }

    return m;
}
---------------------------------------------------------------------------------------
after I have changed the original key.c, I run
diff key.c.orig key.c
to find the following
---------------------- the diff after patching is
-----------------------------
195a196,200
>     sizeof(struct sadb_x_nat_t_type), /* SADB_X_EXT_NAT_T_TYPE */
>     sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_SPORT */
>     sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_DPORT */
>     sizeof(struct sadb_address),    /* SADB_X_EXT_NAT_T_OA */
>     sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */
217a223,227
>     sizeof(struct sadb_x_nat_t_type), /* SADB_X_EXT_NAT_T_TYPE */
>     sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_SPORT */
>     sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_DPORT */
>     0,                /* SADB_X_EXT_NAT_T_OA */
>     sizeof(struct sadb_x_nat_t_frag), /* SADB_X_EXT_NAT_T_FRAG */
385a396,399
> #ifdef IPSEC_NAT_T
> static int key_nat_map(struct socket *, struct mbuf *,
>     const struct sadb_msghdr *);
> #endif
407a422,428
> #ifdef IPSEC_NAT_T
> static struct mbuf *key_setsadbxport __P((u_int16_t, u_int16_t));
> static struct mbuf *key_setsadbxtype __P((u_int16_t));
> #endif
> static void key_porttosaddr __P((struct sockaddr *, u_int16_t));
> #define KEY_PORTTOSADDR(saddr, port) \
>     key_porttosaddr((struct sockaddr *)(saddr), (port))
929c950
< key_allocsa(family, src, dst, proto, spi)
---
> key_allocsa(family, src, dst, proto, spi, sport, dport)
932a954
>     u_int16_t sport, dport;
940a963
>     int chkport = 0;
945a969,973
> #ifdef IPSEC_NAT_T
>     if ((sport != 0) && (dport != 0))
>         chkport = 1;
> #endif
>
1034a1063,1065
> #ifdef IPSEC_NAT_T
>                        sin.sin_port = sport;
> #endif
1036c1067
<                 (struct sockaddr *)&sav->sah->saidx.dst, 0) != 0)
---
>               (struct sockaddr *)&sav->sah->saidx.src, chkport) != 0)
1050a1082,1084
> #ifdef IPSEC_NAT_T
>                        sin6.sin6_port = sport;
> #endif
1052c1086
<                 (struct sockaddr *)&sav->sah->saidx.dst, 0) != 0)
---
>                            (struct sockaddr *)&sav->sah->saidx.src,
chkport) != 0)
1879a1914
> #ifndef IPSEC_NAT_T
1922a1958
> #endif /* !IPSEC_NAT_T */
2481a2518,2583
> #ifdef IPSEC_NAT_T
> /*
>  * SADB_X_NAT_T_NEW_MAPPING
>  */
> static int
> key_nat_map(so, m, mhp)
>     struct socket *so;
>     struct mbuf *m;
>     const struct sadb_msghdr *mhp;
> {
>     struct sadb_x_nat_t_type *type;
>     struct sadb_x_nat_t_port *sport;
>     struct sadb_x_nat_t_port *dport;
>     struct sadb_address *addr;
>     struct sadb_x_nat_t_frag *frag;
>
>     /* sanity check */
>     if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
>         panic("key_nat_map: NULL pointer is passed.");
>
>     if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] == NULL ||
>         mhp->ext[SADB_X_EXT_NAT_T_SPORT] == NULL ||
>         mhp->ext[SADB_X_EXT_NAT_T_DPORT] == NULL) {
>         ipseclog((LOG_DEBUG, "key_nat_map: invalid message.\n"));
>         return key_senderror(so, m, EINVAL);
>     }
>     if ((mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) ||
>         (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) ||
>         (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport))) {
>         ipseclog((LOG_DEBUG, "key_nat_map: invalid message.\n"));
>         return key_senderror(so, m, EINVAL);
>     }
>
>     if ((mhp->ext[SADB_X_EXT_NAT_T_OA] != NULL) &&
>         (mhp->extlen[SADB_X_EXT_NAT_T_OA] < sizeof(*addr))) {
>         ipseclog((LOG_DEBUG, "key_nat_map: invalid message\n"));
>         return key_senderror(so, m, EINVAL);
>     }
>
>     if ((mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) &&
>         (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag))) {
>         ipseclog((LOG_DEBUG, "key_nat_map: invalid message\n"));
>         return key_senderror(so, m, EINVAL);
>     }
>
>     type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE];
>     sport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT];
>     dport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT];
>     addr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OA];
>     frag = (struct sadb_x_nat_t_frag *) mhp->ext[SADB_X_EXT_NAT_T_FRAG];
>
>     printf("sadb_nat_map: type %d, sport = %d, dport = %d\n",
>         type->sadb_x_nat_t_type_type,
>         sport->sadb_x_nat_t_port_port,
>         dport->sadb_x_nat_t_port_port);
>
>     /*
>      * XXX handle that, it should also contain a SA, or anything
>      * that enable to update the SA information.
>      */
>
>     return 0;
> }
> #endif /* IPSEC_NAT_T */
>
>
3031a3134,3137
> #ifdef IPSEC_NAT_T
>     sav->natt_type = 0;
>     sav->esp_frag = 0;
> #endif
3497a3604,3608
> #ifdef IPSEC_NAT_T
>         SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT,
>         SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OA,
>         SADB_X_EXT_NAT_T_FRAG,
> #endif
3573a3685,3709
> #ifdef IPSEC_NAT_T
>         case SADB_X_EXT_NAT_T_TYPE:
>             if ((m = key_setsadbxtype(sav->natt_type)) == NULL)
>                 goto fail;
>             break;
>
>         case SADB_X_EXT_NAT_T_DPORT:
>             if ((m = key_setsadbxport(KEY_PORTFROMSADDR
>                 (&sav->sah->saidx.dst),
>                 SADB_X_EXT_NAT_T_DPORT)) == NULL)
>                 goto fail;
>             break;
>
>         case SADB_X_EXT_NAT_T_SPORT:
>             if ((m = key_setsadbxport(KEY_PORTFROMSADDR
>                 (&sav->sah->saidx.src),
>                 SADB_X_EXT_NAT_T_SPORT)) == NULL)
>                 goto fail;
>             break;
>
>         case SADB_X_EXT_NAT_T_OA:
>         case SADB_X_EXT_NAT_T_FRAG:
>             continue;
> #endif
>
3831a3968,4094
> #ifdef IPSEC_NAT_T
> /*
>  * set a type in sadb_x_nat_t_type
>  */
> static struct mbuf *
> key_setsadbxtype(type)
>     u_int16_t type;
> {
>     struct mbuf *m;
>     size_t len;
>     struct sadb_x_nat_t_type *p;
>
>     len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type));
>
>     m = key_alloc_mbuf(len);
>     if (!m || m->m_next) {    /*XXX*/
>         if (m)
>             m_freem(m);
>         return NULL;
>     }
>
>     p = mtod(m, struct sadb_x_nat_t_type *);
>
>     bzero(p, len);
>     p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len);
>     p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
>     p->sadb_x_nat_t_type_type = type;
>
>     return m;
> }
> /*
>  * set a port in sadb_x_nat_t_port. port is in network order
>  */
> static struct mbuf *
> key_setsadbxport(port, type)
>     u_int16_t port;
>     u_int16_t type;
> {
>     struct mbuf *m;
>     size_t len;
>     struct sadb_x_nat_t_port *p;
>
>     len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port));
>
>     m = key_alloc_mbuf(len);
>     if (!m || m->m_next) {    /*XXX*/
>         if (m)
>             m_freem(m);
>         return NULL;
>     }
>
>     p = mtod(m, struct sadb_x_nat_t_port *);
>
>     bzero(p, len);
>     p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len);
>     p->sadb_x_nat_t_port_exttype = type;
>     p->sadb_x_nat_t_port_port = port;
>
>     return m;
> }
>
> /*
>  * Get port from sockaddr, port is in network order
>  */
> u_int16_t
> key_portfromsaddr(saddr)
>     struct sockaddr *saddr;
> {
>     u_int16_t port;
>
>     switch (saddr->sa_family) {
>     case AF_INET: {
>         struct sockaddr_in *sin = (struct sockaddr_in *)saddr;
>
>         port = sin->sin_port;
>         break;
>     }
> #ifdef INET6
>     case AF_INET6: {
>         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)saddr;
>
>         port = sin6->sin6_port;
>         break;
>     }
> #endif
>     default:
>         printf("key_portfromsaddr: unexpected address family\n");
>         port = 0;
>         break;
>     }
>
>     return port;
> }
> #endif /* IPSEC_NAT_T */
>
> /*
>  * Set port is struct sockaddr. port is in network order
>  */
> static void
> key_porttosaddr(saddr, port)
>     struct sockaddr *saddr;
>     u_int16_t port;
> {
>     switch (saddr->sa_family) {
>     case AF_INET: {
>         struct sockaddr_in *sin = (struct sockaddr_in *)saddr;
>
>         sin->sin_port = port;
>         break;
>     }
> #ifdef INET6
>     case AF_INET6: {
>         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)saddr;
>
>         sin6->sin6_port = port;
>         break;
>     }
> #endif
>     default:
>         printf("key_porttosaddr: unexpected address family %d\n",
>             saddr->sa_family);
>         break;
>     }
>
>     return;
> }
>
4018a4282,4283
>     int chkport = 0;
>
4040a4306,4318
> #ifdef IPSEC_NAT_T
>             /*
>              * If NAT-T is enabled, check ports for tunnel mode.
>              * Don't do it for transport mode, as there is no
>              * port information available in the SP.
>              * XXX also don't check ports if they are set to zero in the
SPD:
>              * This means we bave a non-generated SPD, which can't know
UDP ports.
>              */
>             if (saidx1->mode == IPSEC_MODE_TUNNEL &&
>                 satosin(&saidx1->src)->sin_port &&
>                 satosin(&saidx1->dst)->sin_port )
>                 chkport = 1;
> #endif
4047a4326,4329
> #ifdef IPSEC_NAT_T
>         else
>             chkport = 1;
> #endif
4056c4338
<                 (struct sockaddr *)&saidx1->src, 0) != 0) {
---
>                 (struct sockaddr *)&saidx1->src, chkport) != 0) {
4060c4342
<                 (struct sockaddr *)&saidx1->dst, 0) != 0) {
---
>                 (struct sockaddr *)&saidx1->dst, chkport) != 0) {
4708c4990
<     /* make sure if port number is zero. */
---
>     /* make sure if port number is zero if NAT-T support is NOT compiled.
*/
4713a4996
> #ifndef IPSEC_NAT_T
4714a4998
> #endif
4719a5004
> #ifndef IPSEC_NAT_T
4720a5006
> #endif
4729a5016
> #ifndef IPSEC_NAT_T
4730a5018
> #endif
4735a5024
> #ifndef IPSEC_NAT_T
4736a5026
> #endif
4744a5035,5040
>     /* If not using NAT-T, make sure port numbers are set to zero. */
> #ifndef IPSEC_NAT_T
>     KEY_PORTTOSADDR(&saidx.src, 0);
>     KEY_PORTTOSADDR(&saidx.dst, 0);
> #endif
>
4997a5294,5299
>     /* If not using NAT-T, make sure if port number is zero. */
> #ifndef IPSEC_NAT_T
>     KEY_PORTTOSADDR(&saidx.src, 0);
>     KEY_PORTTOSADDR(&saidx.dst, 0);
> #endif
>
5063a5366,5427
> #ifdef IPSEC_NAT_T
>     /*
>      * Handle NAT-T info if present
>      */
>     if (mhp->ext[SADB_X_EXT_NAT_T_OA] != NULL)
>         printf("update: NAT-T OA present\n");
>
>     if ((mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL) &&
>         (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL) &&
>         (mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL)) {
>         struct sadb_x_nat_t_type *type;
>         struct sadb_x_nat_t_port *sport;
>         struct sadb_x_nat_t_port *dport;
>         struct sadb_address *addr;
>         struct sadb_x_nat_t_frag *frag;
>
>         if ((mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) ||
>             (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) ||
>             (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport))) {
>             ipseclog((LOG_DEBUG, "key_update: "
>                 "invalid message.\n"));
>             return key_senderror(so, m, EINVAL);
>         }
>
>         if ((mhp->ext[SADB_X_EXT_NAT_T_OA] != NULL) &&
>             (mhp->extlen[SADB_X_EXT_NAT_T_OA] < sizeof(*addr))) {
>             ipseclog((LOG_DEBUG, "key_update: invalid message\n"));
>             return key_senderror(so, m, EINVAL);
>         }
>
>         if ((mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) &&
>             (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag))) {
>             ipseclog((LOG_DEBUG, "key_update: invalid message\n"));
>             return key_senderror(so, m, EINVAL);
>         }
>
>         type = (struct sadb_x_nat_t_type *)
>             mhp->ext[SADB_X_EXT_NAT_T_TYPE];
>         sport = (struct sadb_x_nat_t_port *)
>             mhp->ext[SADB_X_EXT_NAT_T_SPORT];
>         dport = (struct sadb_x_nat_t_port *)
>             mhp->ext[SADB_X_EXT_NAT_T_DPORT];
>         addr = (struct sadb_address *)
>             mhp->ext[SADB_X_EXT_NAT_T_OA];
>         frag = (struct sadb_x_nat_t_frag *)
>             mhp->ext[SADB_X_EXT_NAT_T_FRAG];
>
>         if (type)
>             sav->natt_type = type->sadb_x_nat_t_type_type;
>         if (sport)
>             KEY_PORTTOSADDR(&sav->sah->saidx.src,
>                 sport->sadb_x_nat_t_port_port);
>         if (dport)
>             KEY_PORTTOSADDR(&sav->sah->saidx.dst,
>                 dport->sadb_x_nat_t_port_port);
>         if (frag)
>             sav->esp_frag = frag->sadb_x_nat_t_frag_fraglen;
>         else
>             sav->esp_frag = IP_MAXPACKET;
>     }
> #endif /* IPSEC_NAT_T */
>
5192a5557,5561
> #ifndef IPSEC_NAT_T
>     KEY_PORTTOSADDR(&saidx.src, 0);
>     KEY_PORTTOSADDR(&saidx.dst, 0);
> #endif
>
5225a5595,5656
> #ifdef IPSEC_NAT_T
>     /*
>      * Handle NAT-T info if present
>      */
>     if (mhp->ext[SADB_X_EXT_NAT_T_OA] != NULL)
>         printf("add: NAT-T OA present\n");
>
>     if ((mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL) &&
>         (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL) &&
>         (mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL)) {
>         struct sadb_x_nat_t_type *type;
>         struct sadb_x_nat_t_port *sport;
>         struct sadb_x_nat_t_port *dport;
>         struct sadb_address *addr;
>         struct sadb_x_nat_t_frag *frag;
>
>         if ((mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) ||
>             (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) ||
>             (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport))) {
>             ipseclog((LOG_DEBUG, "key_add: "
>                 "invalid message.\n"));
>             return key_senderror(so, m, EINVAL);
>         }
>
>         if ((mhp->ext[SADB_X_EXT_NAT_T_OA] != NULL) &&
>             (mhp->extlen[SADB_X_EXT_NAT_T_OA] < sizeof(*addr))) {
>             ipseclog((LOG_DEBUG, "key_add: invalid message\n"));
>             return key_senderror(so, m, EINVAL);
>         }
>
>         if ((mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) &&
>             (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag))) {
>             ipseclog((LOG_DEBUG, "key_update: invalid message\n"));
>             return key_senderror(so, m, EINVAL);
>         }
>
>         type = (struct sadb_x_nat_t_type *)
>             mhp->ext[SADB_X_EXT_NAT_T_TYPE];
>         sport = (struct sadb_x_nat_t_port *)
>             mhp->ext[SADB_X_EXT_NAT_T_SPORT];
>         dport = (struct sadb_x_nat_t_port *)
>             mhp->ext[SADB_X_EXT_NAT_T_DPORT];
>         addr = (struct sadb_address *)
>             mhp->ext[SADB_X_EXT_NAT_T_OA];
>         frag = (struct sadb_x_nat_t_frag *)
>             mhp->ext[SADB_X_EXT_NAT_T_FRAG];
>
>         if (type)
>             newsav->natt_type = type->sadb_x_nat_t_type_type;
>         if (sport)
>             KEY_PORTTOSADDR(&newsav->sah->saidx.src,
>                 sport->sadb_x_nat_t_port_port);
>         if (dport)
>             KEY_PORTTOSADDR(&newsav->sah->saidx.dst,
>                 dport->sadb_x_nat_t_port_port);
>         if (frag)
>             newsav->esp_frag = frag->sadb_x_nat_t_frag_fraglen;
>         else
>             newsav->esp_frag = IP_MAXPACKET;
>     }
> #endif
>
5419a5851,5855
> #ifndef IPSEC_NAT_T
>     KEY_PORTTOSADDR(&saidx.src, 0);
>     KEY_PORTTOSADDR(&saidx.dst, 0);
> #endif
>
5486a5923,5927
> #ifndef IPSEC_NAT_T
>     KEY_PORTTOSADDR(&saidx.src, 0);
>     KEY_PORTTOSADDR(&saidx.dst, 0);
> #endif
>
5595a6037,6041
> #ifndef IPSEC_NAT_T
>     KEY_PORTTOSADDR(&saidx.src, 0);
>     KEY_PORTTOSADDR(&saidx.dst, 0);
> #endif
>
6275a6722,6726
> #ifndef IPSEC_NAT_T
>     KEY_PORTTOSADDR(&saidx.src, 0);
>     KEY_PORTTOSADDR(&saidx.dst, 0);
> #endif
>
6878a7330,7334
> #ifdef IPSEC_NAT_T
>     key_nat_map, /* SADB_X_NAT_T_NEW_MAPPING */
> #else
>     NULL,
> #endif
7214a7671,7677
> #ifdef IPSEC_NAT_T
>         case SADB_X_EXT_NAT_T_TYPE:
>         case SADB_X_EXT_NAT_T_SPORT:
>         case SADB_X_EXT_NAT_T_DPORT:
>         case SADB_X_EXT_NAT_T_OA:
>         case SADB_X_EXT_NAT_T_FRAG:
> #endif
-------------------------------------------------------------------------

That is all. I am waiting for your reply

-- thanks,
  Kamanashis Roy



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?ce35fdf10609141702n7a1948acmcd66019834f410ac>