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pfkey.c

/*    $KAME: pfkey.c,v 1.47 2003/10/02 19:52:12 itojun Exp $      */

/*
 * Copyright (C) 1995, 1996, 1997, 1998, and 1999 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <net/pfkeyv2.h>
#include <netinet/in.h>
#ifdef HAVE_NETINET6_IPSEC
#  include <netinet6/ipsec.h>
#else
#  include <netinet/ipsec.h>
#endif

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>

#include "ipsec_strerror.h"
#include "libpfkey.h"

#define CALLOC(size, cast) (cast)calloc(1, (size))

static int findsupportedmap __P((int));
static int setsupportedmap __P((struct sadb_supported *));
static struct sadb_alg *findsupportedalg __P((u_int, u_int));
static int pfkey_send_x1 __P((int, u_int, u_int, u_int, struct sockaddr *,
      struct sockaddr *, u_int32_t, u_int32_t, u_int, caddr_t,
      u_int, u_int, u_int, u_int, u_int, u_int32_t, u_int32_t,
      u_int32_t, u_int32_t, u_int32_t,
      u_int8_t, u_int16_t, u_int16_t, struct sockaddr *));
static int pfkey_send_x2 __P((int, u_int, u_int, u_int,
      struct sockaddr *, struct sockaddr *, u_int32_t));
static int pfkey_send_x3 __P((int, u_int, u_int));
static int pfkey_send_x4 __P((int, u_int, struct sockaddr *, u_int,
      struct sockaddr *, u_int, u_int, u_int64_t, u_int64_t,
      char *, int, u_int32_t));
static int pfkey_send_x5 __P((int, u_int, u_int32_t));

static caddr_t pfkey_setsadbmsg __P((caddr_t, caddr_t, u_int, u_int,
      u_int, u_int32_t, pid_t));
static caddr_t pfkey_setsadbsa __P((caddr_t, caddr_t, u_int32_t, u_int,
      u_int, u_int, u_int32_t));
static caddr_t pfkey_setsadbaddr __P((caddr_t, caddr_t, u_int,
      struct sockaddr *, u_int, u_int));
static caddr_t pfkey_setsadbkey __P((caddr_t, caddr_t, u_int, caddr_t, u_int));
static caddr_t pfkey_setsadblifetime __P((caddr_t, caddr_t, u_int, u_int32_t,
      u_int32_t, u_int32_t, u_int32_t));
static caddr_t pfkey_setsadbxsa2 __P((caddr_t, caddr_t, u_int32_t, u_int32_t));

#ifdef SADB_X_EXT_NAT_T_TYPE
static caddr_t pfkey_set_natt_type __P((caddr_t, caddr_t, u_int, u_int8_t));
static caddr_t pfkey_set_natt_port __P((caddr_t, caddr_t, u_int, u_int16_t));
#endif

/*
 * make and search supported algorithm structure.
 */
static struct sadb_supported *ipsec_supported[] = { NULL, NULL, NULL, };

static int supported_map[] = {
      SADB_SATYPE_AH,
      SADB_SATYPE_ESP,
      SADB_X_SATYPE_IPCOMP,
};

static int
findsupportedmap(satype)
      int satype;
{
      int i;

      for (i = 0; i < sizeof(supported_map)/sizeof(supported_map[0]); i++)
            if (supported_map[i] == satype)
                  return i;
      return -1;
}

static struct sadb_alg *
findsupportedalg(satype, alg_id)
      u_int satype, alg_id;
{
      int algno;
      int tlen;
      caddr_t p;

      /* validity check */
      algno = findsupportedmap(satype);
      if (algno == -1) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return NULL;
      }
      if (ipsec_supported[algno] == NULL) {
            __ipsec_errcode = EIPSEC_DO_GET_SUPP_LIST;
            return NULL;
      }

      tlen = ipsec_supported[algno]->sadb_supported_len
            - sizeof(struct sadb_supported);
      p = (caddr_t)(ipsec_supported[algno] + 1);
      while (tlen > 0) {
            if (tlen < sizeof(struct sadb_alg)) {
                  /* invalid format */
                  break;
            }
            if (((struct sadb_alg *)p)->sadb_alg_id == alg_id)
                  return (struct sadb_alg *)p;

            tlen -= sizeof(struct sadb_alg);
            p += sizeof(struct sadb_alg);
      }

      __ipsec_errcode = EIPSEC_NOT_SUPPORTED;
      return NULL;
}

static int
setsupportedmap(sup)
      struct sadb_supported *sup;
{
      struct sadb_supported **ipsup;

      switch (sup->sadb_supported_exttype) {
      case SADB_EXT_SUPPORTED_AUTH:
            ipsup = &ipsec_supported[findsupportedmap(SADB_SATYPE_AH)];
            break;
      case SADB_EXT_SUPPORTED_ENCRYPT:
            ipsup = &ipsec_supported[findsupportedmap(SADB_SATYPE_ESP)];
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_SATYPE;
            return -1;
      }

      if (*ipsup)
            free(*ipsup);

      *ipsup = malloc(sup->sadb_supported_len);
      if (!*ipsup) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }
      memcpy(*ipsup, sup, sup->sadb_supported_len);

      return 0;
}

/*
 * check key length against algorithm specified.
 * This function is called with SADB_EXT_SUPPORTED_{AUTH,ENCRYPT} as the
 * augument, and only calls to ipsec_check_keylen2();
 * keylen is the unit of bit.
 * OUT:
 *    -1: invalid.
 *     0: valid.
 */
int
ipsec_check_keylen(supported, alg_id, keylen)
      u_int supported;
      u_int alg_id;
      u_int keylen;
{
      int satype;

      /* validity check */
      switch (supported) {
      case SADB_EXT_SUPPORTED_AUTH:
            satype = SADB_SATYPE_AH;
            break;
      case SADB_EXT_SUPPORTED_ENCRYPT:
            satype = SADB_SATYPE_ESP;
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }

      return ipsec_check_keylen2(satype, alg_id, keylen);
}

/*
 * check key length against algorithm specified.
 * satype is one of satype defined at pfkeyv2.h.
 * keylen is the unit of bit.
 * OUT:
 *    -1: invalid.
 *     0: valid.
 */
int
ipsec_check_keylen2(satype, alg_id, keylen)
      u_int satype;
      u_int alg_id;
      u_int keylen;
{
      struct sadb_alg *alg;

      alg = findsupportedalg(satype, alg_id);
      if (!alg)
            return -1;

      if (keylen < alg->sadb_alg_minbits || keylen > alg->sadb_alg_maxbits) {
            fprintf(stderr, "%d %d %d\n", keylen, alg->sadb_alg_minbits,
                  alg->sadb_alg_maxbits);
            __ipsec_errcode = EIPSEC_INVAL_KEYLEN;
            return -1;
      }

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return 0;
}

/*
 * get max/min key length against algorithm specified.
 * satype is one of satype defined at pfkeyv2.h.
 * keylen is the unit of bit.
 * OUT:
 *    -1: invalid.
 *     0: valid.
 */
int
ipsec_get_keylen(supported, alg_id, alg0)
      u_int supported, alg_id;
      struct sadb_alg *alg0;
{
      struct sadb_alg *alg;
      u_int satype;

      /* validity check */
      if (!alg0) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }

      switch (supported) {
      case SADB_EXT_SUPPORTED_AUTH:
            satype = SADB_SATYPE_AH;
            break;
      case SADB_EXT_SUPPORTED_ENCRYPT:
            satype = SADB_SATYPE_ESP;
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }

      alg = findsupportedalg(satype, alg_id);
      if (!alg)
            return -1;

      memcpy(alg0, alg, sizeof(*alg0));

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return 0;
}

/*
 * set the rate for SOFT lifetime against HARD one.
 * If rate is more than 100 or equal to zero, then set to 100.
 */
static u_int soft_lifetime_allocations_rate = PFKEY_SOFT_LIFETIME_RATE;
static u_int soft_lifetime_bytes_rate = PFKEY_SOFT_LIFETIME_RATE;
static u_int soft_lifetime_addtime_rate = PFKEY_SOFT_LIFETIME_RATE;
static u_int soft_lifetime_usetime_rate = PFKEY_SOFT_LIFETIME_RATE;

u_int
pfkey_set_softrate(type, rate)
      u_int type, rate;
{
      __ipsec_errcode = EIPSEC_NO_ERROR;

      if (rate > 100 || rate == 0)
            rate = 100;

      switch (type) {
      case SADB_X_LIFETIME_ALLOCATIONS:
            soft_lifetime_allocations_rate = rate;
            return 0;
      case SADB_X_LIFETIME_BYTES:
            soft_lifetime_bytes_rate = rate;
            return 0;
      case SADB_X_LIFETIME_ADDTIME:
            soft_lifetime_addtime_rate = rate;
            return 0;
      case SADB_X_LIFETIME_USETIME:
            soft_lifetime_usetime_rate = rate;
            return 0;
      }

      __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
      return 1;
}

/*
 * get current rate for SOFT lifetime against HARD one.
 * ATTENTION: ~0 is returned if invalid type was passed.
 */
u_int
pfkey_get_softrate(type)
      u_int type;
{
      switch (type) {
      case SADB_X_LIFETIME_ALLOCATIONS:
            return soft_lifetime_allocations_rate;
      case SADB_X_LIFETIME_BYTES:
            return soft_lifetime_bytes_rate;
      case SADB_X_LIFETIME_ADDTIME:
            return soft_lifetime_addtime_rate;
      case SADB_X_LIFETIME_USETIME:
            return soft_lifetime_usetime_rate;
      }

      return ~0;
}

/*
 * sending SADB_GETSPI message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_getspi(so, satype, mode, src, dst, min, max, reqid, seq)
      int so;
      u_int satype, mode;
      struct sockaddr *src, *dst;
      u_int32_t min, max, reqid, seq;
{
      struct sadb_msg *newmsg;
      caddr_t ep;
      int len;
      int need_spirange = 0;
      caddr_t p;
      int plen;

      /* validity check */
      if (src == NULL || dst == NULL) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }
      if (src->sa_family != dst->sa_family) {
            __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
            return -1;
      }
      if (min > max || (min > 0 && min <= 255)) {
            __ipsec_errcode = EIPSEC_INVAL_SPI;
            return -1;
      }
      switch (src->sa_family) {
      case AF_INET:
            plen = sizeof(struct in_addr) << 3;
            break;
      case AF_INET6:
            plen = sizeof(struct in6_addr) << 3;
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_FAMILY;
            return -1;
      }

      /* create new sadb_msg to send. */
      len = sizeof(struct sadb_msg)
            + sizeof(struct sadb_x_sa2)
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(src))
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(dst));

      if (min > 255 && max < ~0) {
            need_spirange++;
            len += sizeof(struct sadb_spirange);
      }

      if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }
      ep = ((caddr_t)newmsg) + len;

      p = pfkey_setsadbmsg((caddr_t)newmsg, ep, SADB_GETSPI,
          len, satype, seq, getpid());
      if (!p) {
            free(newmsg);
            return -1;
      }

      p = pfkey_setsadbxsa2(p, ep, mode, reqid);
      if (!p) {
            free(newmsg);
            return -1;
      }

      /* set sadb_address for source */
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
          IPSEC_ULPROTO_ANY);
      if (!p) {
            free(newmsg);
            return -1;
      }

      /* set sadb_address for destination */
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
          IPSEC_ULPROTO_ANY);
      if (!p) {
            free(newmsg);
            return -1;
      }

      /* proccessing spi range */
      if (need_spirange) {
            struct sadb_spirange spirange;

            if (p + sizeof(spirange) > ep) {
                  free(newmsg);
                  return -1;
            }

            memset(&spirange, 0, sizeof(spirange));
            spirange.sadb_spirange_len = PFKEY_UNIT64(sizeof(spirange));
            spirange.sadb_spirange_exttype = SADB_EXT_SPIRANGE;
            spirange.sadb_spirange_min = min;
            spirange.sadb_spirange_max = max;

            memcpy(p, &spirange, sizeof(spirange));

            p += sizeof(spirange);
      }
      if (p != ep) {
            free(newmsg);
            return -1;
      }

      /* send message */
      len = pfkey_send(so, newmsg, len);
      free(newmsg);

      if (len < 0)
            return -1;

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return len;
}

/*
 * sending SADB_UPDATE message to the kernel.
 * The length of key material is a_keylen + e_keylen.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_update(so, satype, mode, src, dst, spi, reqid, wsize,
            keymat, e_type, e_keylen, a_type, a_keylen, flags,
            l_alloc, l_bytes, l_addtime, l_usetime, seq)
      int so;
      u_int satype, mode, wsize;
      struct sockaddr *src, *dst;
      u_int32_t spi, reqid;
      caddr_t keymat;
      u_int e_type, e_keylen, a_type, a_keylen, flags;
      u_int32_t l_alloc;
      u_int64_t l_bytes, l_addtime, l_usetime;
      u_int32_t seq;
{
      int len;
      if ((len = pfkey_send_x1(so, SADB_UPDATE, satype, mode, src, dst, spi,
                  reqid, wsize,
                  keymat, e_type, e_keylen, a_type, a_keylen, flags,
                  l_alloc, l_bytes, l_addtime, l_usetime, seq,
                  0, 0, 0, NULL)) < 0)
            return -1;

      return len;
}

#ifdef SADB_X_EXT_NAT_T_TYPE
int
pfkey_send_update_nat(so, satype, mode, src, dst, spi, reqid, wsize,
                  keymat, e_type, e_keylen, a_type, a_keylen, flags,
                  l_alloc, l_bytes, l_addtime, l_usetime, seq,
                  l_natt_type, l_natt_sport, l_natt_dport, l_natt_oa)
      int so;
      u_int satype, mode, wsize;
      struct sockaddr *src, *dst;
      u_int32_t spi, reqid;
      caddr_t keymat;
      u_int e_type, e_keylen, a_type, a_keylen, flags;
      u_int32_t l_alloc;
      u_int64_t l_bytes, l_addtime, l_usetime;
      u_int32_t seq;
      u_int8_t l_natt_type;
      u_int16_t l_natt_sport, l_natt_dport;
      struct sockaddr *l_natt_oa;
{
      int len;
      if ((len = pfkey_send_x1(so, SADB_UPDATE, satype, mode, src, dst, spi,
                  reqid, wsize,
                  keymat, e_type, e_keylen, a_type, a_keylen, flags,
                  l_alloc, l_bytes, l_addtime, l_usetime, seq,
                  l_natt_type, l_natt_sport, l_natt_dport, l_natt_oa)) < 0)
            return -1;

      return len;
}
#endif

/*
 * sending SADB_ADD message to the kernel.
 * The length of key material is a_keylen + e_keylen.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_add(so, satype, mode, src, dst, spi, reqid, wsize,
            keymat, e_type, e_keylen, a_type, a_keylen, flags,
            l_alloc, l_bytes, l_addtime, l_usetime, seq)
      int so;
      u_int satype, mode, wsize;
      struct sockaddr *src, *dst;
      u_int32_t spi, reqid;
      caddr_t keymat;
      u_int e_type, e_keylen, a_type, a_keylen, flags;
      u_int32_t l_alloc;
      u_int64_t l_bytes, l_addtime, l_usetime;
      u_int32_t seq;
{
      int len;
      if ((len = pfkey_send_x1(so, SADB_ADD, satype, mode, src, dst, spi,
                  reqid, wsize,
                  keymat, e_type, e_keylen, a_type, a_keylen, flags,
                  l_alloc, l_bytes, l_addtime, l_usetime, seq,
                  0, 0, 0, NULL)) < 0)
            return -1;

      return len;
}

#ifdef SADB_X_EXT_NAT_T_TYPE
int
pfkey_send_add_nat(so, satype, mode, src, dst, spi, reqid, wsize,
               keymat, e_type, e_keylen, a_type, a_keylen, flags,
               l_alloc, l_bytes, l_addtime, l_usetime, seq,
               l_natt_type, l_natt_sport, l_natt_dport, l_natt_oa)
      int so;
      u_int satype, mode, wsize;
      struct sockaddr *src, *dst;
      u_int32_t spi, reqid;
      caddr_t keymat;
      u_int e_type, e_keylen, a_type, a_keylen, flags;
      u_int32_t l_alloc;
      u_int64_t l_bytes, l_addtime, l_usetime;
      u_int32_t seq;
      u_int8_t l_natt_type;
      u_int16_t l_natt_sport, l_natt_dport;
      struct sockaddr *l_natt_oa;
{
      int len;
      if ((len = pfkey_send_x1(so, SADB_ADD, satype, mode, src, dst, spi,
                  reqid, wsize,
                  keymat, e_type, e_keylen, a_type, a_keylen, flags,
                  l_alloc, l_bytes, l_addtime, l_usetime, seq,
                  l_natt_type, l_natt_sport, l_natt_dport, l_natt_oa)) < 0)
            return -1;

      return len;
}
#endif

/*
 * sending SADB_DELETE message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_delete(so, satype, mode, src, dst, spi)
      int so;
      u_int satype, mode;
      struct sockaddr *src, *dst;
      u_int32_t spi;
{
      int len;
      if ((len = pfkey_send_x2(so, SADB_DELETE, satype, mode, src, dst, spi)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_DELETE without spi to the kernel.  This is
 * the "delete all" request (an extension also present in
 * Solaris).
 *
 * OUT:
 *    positive: success and return length sent
 *    -1    : error occured, and set errno
 */
int
pfkey_send_delete_all(so, satype, mode, src, dst)
      int so;
      u_int satype, mode;
      struct sockaddr *src, *dst;
{
      struct sadb_msg *newmsg;
      int len;
      caddr_t p;
      int plen;
      caddr_t ep;

      /* validity check */
      if (src == NULL || dst == NULL) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }
      if (src->sa_family != dst->sa_family) {
            __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
            return -1;
      }
      switch (src->sa_family) {
      case AF_INET:
            plen = sizeof(struct in_addr) << 3;
            break;
      case AF_INET6:
            plen = sizeof(struct in6_addr) << 3;
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_FAMILY;
            return -1;
      }

      /* create new sadb_msg to reply. */
      len = sizeof(struct sadb_msg)
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(src))
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(dst));

      if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }
      ep = ((caddr_t)newmsg) + len;

      p = pfkey_setsadbmsg((caddr_t)newmsg, ep, SADB_DELETE, len, satype, 0,
          getpid());
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
          IPSEC_ULPROTO_ANY);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
          IPSEC_ULPROTO_ANY);
      if (!p || p != ep) {
            free(newmsg);
            return -1;
      }

      /* send message */
      len = pfkey_send(so, newmsg, len);
      free(newmsg);

      if (len < 0)
            return -1;

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return len;
}

/*
 * sending SADB_GET message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_get(so, satype, mode, src, dst, spi)
      int so;
      u_int satype, mode;
      struct sockaddr *src, *dst;
      u_int32_t spi;
{
      int len;
      if ((len = pfkey_send_x2(so, SADB_GET, satype, mode, src, dst, spi)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_REGISTER message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_register(so, satype)
      int so;
      u_int satype;
{
      int len, algno;

      if (satype == PF_UNSPEC) {
            for (algno = 0;
                 algno < sizeof(supported_map)/sizeof(supported_map[0]);
                 algno++) {
                  if (ipsec_supported[algno]) {
                        free(ipsec_supported[algno]);
                        ipsec_supported[algno] = NULL;
                  }
            }
      } else {
            algno = findsupportedmap(satype);
            if (algno == -1) {
                  __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
                  return -1;
            }

            if (ipsec_supported[algno]) {
                  free(ipsec_supported[algno]);
                  ipsec_supported[algno] = NULL;
            }
      }

      if ((len = pfkey_send_x3(so, SADB_REGISTER, satype)) < 0)
            return -1;

      return len;
}

/*
 * receiving SADB_REGISTER message from the kernel, and copy buffer for
 * sadb_supported returned into ipsec_supported.
 * OUT:
 *     0: success and return length sent.
 *    -1: error occured, and set errno.
 */
int
pfkey_recv_register(so)
      int so;
{
      pid_t pid = getpid();
      struct sadb_msg *newmsg;
      int error = -1;

      /* receive message */
      for (;;) {
            if ((newmsg = pfkey_recv(so)) == NULL)
                  return -1;
            if (newmsg->sadb_msg_type == SADB_REGISTER &&
                newmsg->sadb_msg_pid == pid)
                  break;
            free(newmsg);
      }

      /* check and fix */
      newmsg->sadb_msg_len = PFKEY_UNUNIT64(newmsg->sadb_msg_len);

      error = pfkey_set_supported(newmsg, newmsg->sadb_msg_len);
      free(newmsg);

      if (error == 0)
            __ipsec_errcode = EIPSEC_NO_ERROR;

      return error;
}

/*
 * receiving SADB_REGISTER message from the kernel, and copy buffer for
 * sadb_supported returned into ipsec_supported.
 * NOTE: sadb_msg_len must be host order.
 * IN:
 *    tlen: msg length, it's to makeing sure.
 * OUT:
 *     0: success and return length sent.
 *    -1: error occured, and set errno.
 */
int
pfkey_set_supported(msg, tlen)
      struct sadb_msg *msg;
      int tlen;
{
      struct sadb_supported *sup;
      caddr_t p;
      caddr_t ep;

      /* validity */
      if (msg->sadb_msg_len != tlen) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }

      p = (caddr_t)msg;
      ep = p + tlen;

      p += sizeof(struct sadb_msg);

      while (p < ep) {
            sup = (struct sadb_supported *)p;
            if (ep < p + sizeof(*sup) ||
                PFKEY_EXTLEN(sup) < sizeof(*sup) ||
                ep < p + sup->sadb_supported_len) {
                  /* invalid format */
                  break;
            }

            switch (sup->sadb_supported_exttype) {
            case SADB_EXT_SUPPORTED_AUTH:
            case SADB_EXT_SUPPORTED_ENCRYPT:
                  break;
            default:
                  __ipsec_errcode = EIPSEC_INVAL_SATYPE;
                  return -1;
            }

            /* fixed length */
            sup->sadb_supported_len = PFKEY_EXTLEN(sup);

            /* set supported map */
            if (setsupportedmap(sup) != 0)
                  return -1;

            p += sup->sadb_supported_len;
      }

      if (p != ep) {
            __ipsec_errcode = EIPSEC_INVAL_SATYPE;
            return -1;
      }

      __ipsec_errcode = EIPSEC_NO_ERROR;

      return 0;
}

/*
 * sending SADB_FLUSH message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_flush(so, satype)
      int so;
      u_int satype;
{
      int len;

      if ((len = pfkey_send_x3(so, SADB_FLUSH, satype)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_DUMP message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_dump(so, satype)
      int so;
      u_int satype;
{
      int len;

      if ((len = pfkey_send_x3(so, SADB_DUMP, satype)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_PROMISC message to the kernel.
 * NOTE that this function handles promisc mode toggle only.
 * IN:
 *    flag: set promisc off if zero, set promisc on if non-zero.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 *    0     : error occured, and set errno.
 *    others: a pointer to new allocated buffer in which supported
 *            algorithms is.
 */
int
pfkey_send_promisc_toggle(so, flag)
      int so;
      int flag;
{
      int len;

      if ((len = pfkey_send_x3(so, SADB_X_PROMISC, (flag ? 1 : 0))) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_SPDADD message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spdadd(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
      int so;
      struct sockaddr *src, *dst;
      u_int prefs, prefd, proto;
      caddr_t policy;
      int policylen;
      u_int32_t seq;
{
      int len;

      if ((len = pfkey_send_x4(so, SADB_X_SPDADD,
                        src, prefs, dst, prefd, proto,
                        0, 0,
                        policy, policylen, seq)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_SPDADD message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spdadd2(so, src, prefs, dst, prefd, proto, ltime, vtime,
            policy, policylen, seq)
      int so;
      struct sockaddr *src, *dst;
      u_int prefs, prefd, proto;
      u_int64_t ltime, vtime;
      caddr_t policy;
      int policylen;
      u_int32_t seq;
{
      int len;

      if ((len = pfkey_send_x4(so, SADB_X_SPDADD,
                        src, prefs, dst, prefd, proto,
                        ltime, vtime,
                        policy, policylen, seq)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_SPDUPDATE message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spdupdate(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
      int so;
      struct sockaddr *src, *dst;
      u_int prefs, prefd, proto;
      caddr_t policy;
      int policylen;
      u_int32_t seq;
{
      int len;

      if ((len = pfkey_send_x4(so, SADB_X_SPDUPDATE,
                        src, prefs, dst, prefd, proto,
                        0, 0,
                        policy, policylen, seq)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_SPDUPDATE message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spdupdate2(so, src, prefs, dst, prefd, proto, ltime, vtime,
            policy, policylen, seq)
      int so;
      struct sockaddr *src, *dst;
      u_int prefs, prefd, proto;
      u_int64_t ltime, vtime;
      caddr_t policy;
      int policylen;
      u_int32_t seq;
{
      int len;

      if ((len = pfkey_send_x4(so, SADB_X_SPDUPDATE,
                        src, prefs, dst, prefd, proto,
                        ltime, vtime,
                        policy, policylen, seq)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_SPDDELETE message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spddelete(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
      int so;
      struct sockaddr *src, *dst;
      u_int prefs, prefd, proto;
      caddr_t policy;
      int policylen;
      u_int32_t seq;
{
      int len;

      if (policylen != sizeof(struct sadb_x_policy)) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }

      if ((len = pfkey_send_x4(so, SADB_X_SPDDELETE,
                        src, prefs, dst, prefd, proto,
                        0, 0,
                        policy, policylen, seq)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_SPDDELETE message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spddelete2(so, spid)
      int so;
      u_int32_t spid;
{
      int len;

      if ((len = pfkey_send_x5(so, SADB_X_SPDDELETE2, spid)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_SPDGET message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spdget(so, spid)
      int so;
      u_int32_t spid;
{
      int len;

      if ((len = pfkey_send_x5(so, SADB_X_SPDGET, spid)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_X_SPDSETIDX message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spdsetidx(so, src, prefs, dst, prefd, proto, policy, policylen, seq)
      int so;
      struct sockaddr *src, *dst;
      u_int prefs, prefd, proto;
      caddr_t policy;
      int policylen;
      u_int32_t seq;
{
      int len;

      if (policylen != sizeof(struct sadb_x_policy)) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }

      if ((len = pfkey_send_x4(so, SADB_X_SPDSETIDX,
                        src, prefs, dst, prefd, proto,
                        0, 0,
                        policy, policylen, seq)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_SPDFLUSH message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spdflush(so)
      int so;
{
      int len;

      if ((len = pfkey_send_x3(so, SADB_X_SPDFLUSH, SADB_SATYPE_UNSPEC)) < 0)
            return -1;

      return len;
}

/*
 * sending SADB_SPDDUMP message to the kernel.
 * OUT:
 *    positive: success and return length sent.
 *    -1    : error occured, and set errno.
 */
int
pfkey_send_spddump(so)
      int so;
{
      int len;

      if ((len = pfkey_send_x3(so, SADB_X_SPDDUMP, SADB_SATYPE_UNSPEC)) < 0)
            return -1;

      return len;
}

/* sending SADB_ADD or SADB_UPDATE message to the kernel */
static int
pfkey_send_x1(so, type, satype, mode, src, dst, spi, reqid, wsize,
            keymat, e_type, e_keylen, a_type, a_keylen, flags,
            l_alloc, l_bytes, l_addtime, l_usetime, seq,
              l_natt_type, l_natt_sport, l_natt_dport, l_natt_oa)
      int so;
      u_int type, satype, mode;
      struct sockaddr *src, *dst, *l_natt_oa;
      u_int32_t spi, reqid;
      u_int wsize;
      caddr_t keymat;
      u_int e_type, e_keylen, a_type, a_keylen, flags;
      u_int32_t l_alloc, l_bytes, l_addtime, l_usetime, seq;
      u_int16_t l_natt_sport, l_natt_dport;
      u_int8_t l_natt_type;
{
      struct sadb_msg *newmsg;
      int len;
      caddr_t p;
      int plen;
      caddr_t ep;

      /* validity check */
      if (src == NULL || dst == NULL) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }
      if (src->sa_family != dst->sa_family) {
            __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
            return -1;
      }
      switch (src->sa_family) {
      case AF_INET:
            plen = sizeof(struct in_addr) << 3;
            break;
      case AF_INET6:
            plen = sizeof(struct in6_addr) << 3;
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_FAMILY;
            return -1;
      }

      switch (satype) {
      case SADB_SATYPE_ESP:
            if (e_type == SADB_EALG_NONE) {
                  __ipsec_errcode = EIPSEC_NO_ALGS;
                  return -1;
            }
            break;
      case SADB_SATYPE_AH:
            if (e_type != SADB_EALG_NONE) {
                  __ipsec_errcode = EIPSEC_INVAL_ALGS;
                  return -1;
            }
            if (a_type == SADB_AALG_NONE) {
                  __ipsec_errcode = EIPSEC_NO_ALGS;
                  return -1;
            }
            break;
      case SADB_X_SATYPE_IPCOMP:
            if (e_type == SADB_X_CALG_NONE) {
                  __ipsec_errcode = EIPSEC_INVAL_ALGS;
                  return -1;
            }
            if (a_type != SADB_AALG_NONE) {
                  __ipsec_errcode = EIPSEC_NO_ALGS;
                  return -1;
            }
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_SATYPE;
            return -1;
      }

      /* create new sadb_msg to reply. */
      len = sizeof(struct sadb_msg)
            + sizeof(struct sadb_sa)
            + sizeof(struct sadb_x_sa2)
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(src))
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(dst))
            + sizeof(struct sadb_lifetime)
            + sizeof(struct sadb_lifetime);

      if (e_type != SADB_EALG_NONE && satype != SADB_X_SATYPE_IPCOMP)
            len += (sizeof(struct sadb_key) + PFKEY_ALIGN8(e_keylen));
      if (a_type != SADB_AALG_NONE)
            len += (sizeof(struct sadb_key) + PFKEY_ALIGN8(a_keylen));

#ifdef SADB_X_EXT_NAT_T_TYPE
      /* add nat-t packets */
      if (l_natt_type) {
            if (satype != SADB_SATYPE_ESP) {
                  __ipsec_errcode = EIPSEC_NO_ALGS;
                  return -1;
            }

            len += sizeof(struct sadb_x_nat_t_type);
            len += sizeof(struct sadb_x_nat_t_port);
            len += sizeof(struct sadb_x_nat_t_port);
            if (l_natt_oa)
                  len += sizeof(struct sadb_address) +
                    PFKEY_ALIGN8(sysdep_sa_len(l_natt_oa));
      }
#endif

      if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }
      ep = ((caddr_t)newmsg) + len;

      p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
                           satype, seq, getpid());
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbsa(p, ep, spi, wsize, a_type, e_type, flags);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbxsa2(p, ep, mode, reqid);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
          IPSEC_ULPROTO_ANY);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
          IPSEC_ULPROTO_ANY);
      if (!p) {
            free(newmsg);
            return -1;
      }

      if (e_type != SADB_EALG_NONE && satype != SADB_X_SATYPE_IPCOMP) {
            p = pfkey_setsadbkey(p, ep, SADB_EXT_KEY_ENCRYPT,
                               keymat, e_keylen);
            if (!p) {
                  free(newmsg);
                  return -1;
            }
      }
      if (a_type != SADB_AALG_NONE) {
            p = pfkey_setsadbkey(p, ep, SADB_EXT_KEY_AUTH,
                               keymat + e_keylen, a_keylen);
            if (!p) {
                  free(newmsg);
                  return -1;
            }
      }

      /* set sadb_lifetime for destination */
      p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_HARD,
                  l_alloc, l_bytes, l_addtime, l_usetime);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_SOFT,
                  l_alloc, l_bytes, l_addtime, l_usetime);
      if (!p) {
            free(newmsg);
            return -1;
      }

#ifdef SADB_X_EXT_NAT_T_TYPE
      /* Add nat-t messages */
      if (l_natt_type) {
            p = pfkey_set_natt_type(p, ep, SADB_X_EXT_NAT_T_TYPE, l_natt_type);
            if (!p) {
                  free(newmsg);
                  return -1;
            }

            p = pfkey_set_natt_port(p, ep, SADB_X_EXT_NAT_T_SPORT,
                              l_natt_sport);
            if (!p) {
                  free(newmsg);
                  return -1;
            }

            p = pfkey_set_natt_port(p, ep, SADB_X_EXT_NAT_T_DPORT,
                              l_natt_dport);
            if (!p) {
                  free(newmsg);
                  return -1;
            }

            if (l_natt_oa) {
                  p = pfkey_setsadbaddr(p, ep, SADB_X_EXT_NAT_T_OA,
                                    l_natt_oa,
                                    PFKEY_ALIGN8(sysdep_sa_len(l_natt_oa)),
                                    IPSEC_ULPROTO_ANY);
                  if (!p) {
                        free(newmsg);
                        return -1;
                  }
            }
      }
#endif

      if (p != ep) {
            free(newmsg);
            return -1;
      }

      /* send message */
      len = pfkey_send(so, newmsg, len);
      free(newmsg);

      if (len < 0)
            return -1;

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return len;
}

/* sending SADB_DELETE or SADB_GET message to the kernel */
static int
pfkey_send_x2(so, type, satype, mode, src, dst, spi)
      int so;
      u_int type, satype, mode;
      struct sockaddr *src, *dst;
      u_int32_t spi;
{
      struct sadb_msg *newmsg;
      int len;
      caddr_t p;
      int plen;
      caddr_t ep;

      /* validity check */
      if (src == NULL || dst == NULL) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }
      if (src->sa_family != dst->sa_family) {
            __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
            return -1;
      }
      switch (src->sa_family) {
      case AF_INET:
            plen = sizeof(struct in_addr) << 3;
            break;
      case AF_INET6:
            plen = sizeof(struct in6_addr) << 3;
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_FAMILY;
            return -1;
      }

      /* create new sadb_msg to reply. */
      len = sizeof(struct sadb_msg)
            + sizeof(struct sadb_sa)
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(src))
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(dst));

      if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }
      ep = ((caddr_t)newmsg) + len;

      p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len, satype, 0,
          getpid());
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbsa(p, ep, spi, 0, 0, 0, 0);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, plen,
          IPSEC_ULPROTO_ANY);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, plen,
          IPSEC_ULPROTO_ANY);
      if (!p || p != ep) {
            free(newmsg);
            return -1;
      }

      /* send message */
      len = pfkey_send(so, newmsg, len);
      free(newmsg);

      if (len < 0)
            return -1;

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return len;
}

/*
 * sending SADB_REGISTER, SADB_FLUSH, SADB_DUMP or SADB_X_PROMISC message
 * to the kernel
 */
static int
pfkey_send_x3(so, type, satype)
      int so;
      u_int type, satype;
{
      struct sadb_msg *newmsg;
      int len;
      caddr_t p;
      caddr_t ep;

      /* validity check */
      switch (type) {
      case SADB_X_PROMISC:
            if (satype != 0 && satype != 1) {
                  __ipsec_errcode = EIPSEC_INVAL_SATYPE;
                  return -1;
            }
            break;
      default:
            switch (satype) {
            case SADB_SATYPE_UNSPEC:
            case SADB_SATYPE_AH:
            case SADB_SATYPE_ESP:
            case SADB_X_SATYPE_IPCOMP:
                  break;
            default:
                  __ipsec_errcode = EIPSEC_INVAL_SATYPE;
                  return -1;
            }
      }

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

      if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }
      ep = ((caddr_t)newmsg) + len;

      p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len, satype, 0,
          getpid());
      if (!p || p != ep) {
            free(newmsg);
            return -1;
      }

      /* send message */
      len = pfkey_send(so, newmsg, len);
      free(newmsg);

      if (len < 0)
            return -1;

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return len;
}

/* sending SADB_X_SPDADD message to the kernel */
static int
pfkey_send_x4(so, type, src, prefs, dst, prefd, proto,
            ltime, vtime, policy, policylen, seq)
      int so;
      struct sockaddr *src, *dst;
      u_int type, prefs, prefd, proto;
      u_int64_t ltime, vtime;
      char *policy;
      int policylen;
      u_int32_t seq;
{
      struct sadb_msg *newmsg;
      int len;
      caddr_t p;
      int plen;
      caddr_t ep;

      /* validity check */
      if (src == NULL || dst == NULL) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }
      if (src->sa_family != dst->sa_family) {
            __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
            return -1;
      }

      switch (src->sa_family) {
      case AF_INET:
            plen = sizeof(struct in_addr) << 3;
            break;
      case AF_INET6:
            plen = sizeof(struct in6_addr) << 3;
            break;
      default:
            __ipsec_errcode = EIPSEC_INVAL_FAMILY;
            return -1;
      }
      if (prefs > plen || prefd > plen) {
            __ipsec_errcode = EIPSEC_INVAL_PREFIXLEN;
            return -1;
      }

      /* create new sadb_msg to reply. */
      len = sizeof(struct sadb_msg)
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(src))
            + sizeof(struct sadb_address)
            + PFKEY_ALIGN8(sysdep_sa_len(src))
            + sizeof(struct sadb_lifetime)
            + policylen;

      if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }
      ep = ((caddr_t)newmsg) + len;

      p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
          SADB_SATYPE_UNSPEC, seq, getpid());
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_SRC, src, prefs, proto);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadbaddr(p, ep, SADB_EXT_ADDRESS_DST, dst, prefd, proto);
      if (!p) {
            free(newmsg);
            return -1;
      }
      p = pfkey_setsadblifetime(p, ep, SADB_EXT_LIFETIME_HARD,
                  0, 0, ltime, vtime);
      if (!p || p + policylen != ep) {
            free(newmsg);
            return -1;
      }
      memcpy(p, policy, policylen);

      /* send message */
      len = pfkey_send(so, newmsg, len);
      free(newmsg);

      if (len < 0)
            return -1;

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return len;
}

/* sending SADB_X_SPDGET or SADB_X_SPDDELETE message to the kernel */
static int
pfkey_send_x5(so, type, spid)
      int so;
      u_int type;
      u_int32_t spid;
{
      struct sadb_msg *newmsg;
      struct sadb_x_policy xpl;
      int len;
      caddr_t p;
      caddr_t ep;

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

      if ((newmsg = CALLOC(len, struct sadb_msg *)) == NULL) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }
      ep = ((caddr_t)newmsg) + len;

      p = pfkey_setsadbmsg((caddr_t)newmsg, ep, type, len,
          SADB_SATYPE_UNSPEC, 0, getpid());
      if (!p) {
            free(newmsg);
            return -1;
      }

      if (p + sizeof(xpl) != ep) {
            free(newmsg);
            return -1;
      }
      memset(&xpl, 0, sizeof(xpl));
      xpl.sadb_x_policy_len = PFKEY_UNIT64(sizeof(xpl));
      xpl.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
      xpl.sadb_x_policy_id = spid;
      memcpy(p, &xpl, sizeof(xpl));

      /* send message */
      len = pfkey_send(so, newmsg, len);
      free(newmsg);

      if (len < 0)
            return -1;

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return len;
}

/*
 * open a socket.
 * OUT:
 *    -1: fail.
 *    others : success and return value of socket.
 */
int
pfkey_open()
{
      int so;
      const int bufsiz = 128 * 1024;      /*is 128K enough?*/

      if ((so = socket(PF_KEY, SOCK_RAW, PF_KEY_V2)) < 0) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }

      /*
       * This is a temporary workaround for KAME PR 154.
       * Don't really care even if it fails.
       */
      (void)setsockopt(so, SOL_SOCKET, SO_SNDBUF, &bufsiz, sizeof(bufsiz));
      (void)setsockopt(so, SOL_SOCKET, SO_RCVBUF, &bufsiz, sizeof(bufsiz));

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return so;
}

/*
 * close a socket.
 * OUT:
 *     0: success.
 *    -1: fail.
 */
void
pfkey_close(so)
      int so;
{
      (void)close(so);

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return;
}

/*
 * receive sadb_msg data, and return pointer to new buffer allocated.
 * Must free this buffer later.
 * OUT:
 *    NULL  : error occured.
 *    others      : a pointer to sadb_msg structure.
 *
 * XXX should be rewritten to pass length explicitly
 */
struct sadb_msg *
pfkey_recv(so)
      int so;
{
      struct sadb_msg buf, *newmsg;
      int len, reallen;

      while ((len = recv(so, (caddr_t)&buf, sizeof(buf), MSG_PEEK)) < 0) {
            if (errno == EINTR)
                  continue;
            __ipsec_set_strerror(strerror(errno));
            return NULL;
      }

      if (len < sizeof(buf)) {
            recv(so, (caddr_t)&buf, sizeof(buf), 0);
            __ipsec_errcode = EIPSEC_MAX;
            return NULL;
      }

      /* read real message */
      reallen = PFKEY_UNUNIT64(buf.sadb_msg_len);
      if ((newmsg = CALLOC(reallen, struct sadb_msg *)) == 0) {
            __ipsec_set_strerror(strerror(errno));
            return NULL;
      }

      while ((len = recv(so, (caddr_t)newmsg, reallen, 0)) < 0) {
            if (errno == EINTR)
                  continue;
            __ipsec_set_strerror(strerror(errno));
            free(newmsg);
            return NULL;
      }

      if (len != reallen) {
            __ipsec_errcode = EIPSEC_SYSTEM_ERROR;
            free(newmsg);
            return NULL;
      }

      /* don't trust what the kernel says, validate! */
      if (PFKEY_UNUNIT64(newmsg->sadb_msg_len) != len) {
            __ipsec_errcode = EIPSEC_SYSTEM_ERROR;
            free(newmsg);
            return NULL;
      }

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return newmsg;
}

/*
 * send message to a socket.
 * OUT:
 *     others: success and return length sent.
 *    -1     : fail.
 */
int
pfkey_send(so, msg, len)
      int so;
      struct sadb_msg *msg;
      int len;
{
      if ((len = send(so, (caddr_t)msg, len, 0)) < 0) {
            __ipsec_set_strerror(strerror(errno));
            return -1;
      }

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return len;
}

/*
 * %%% Utilities
 * NOTE: These functions are derived from netkey/key.c in KAME.
 */
/*
 * set the pointer to each header in this message buffer.
 * IN:      msg: pointer to message buffer.
 *    mhp: pointer to the buffer initialized like below:
 *          caddr_t mhp[SADB_EXT_MAX + 1];
 * OUT:     -1: invalid.
 *     0: valid.
 *
 * XXX should be rewritten to obtain length explicitly
 */
int
pfkey_align(msg, mhp)
      struct sadb_msg *msg;
      caddr_t *mhp;
{
      struct sadb_ext *ext;
      int i;
      caddr_t p;
      caddr_t ep; /* XXX should be passed from upper layer */

      /* validity check */
      if (msg == NULL || mhp == NULL) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }

      /* initialize */
      for (i = 0; i < SADB_EXT_MAX + 1; i++)
            mhp[i] = NULL;

      mhp[0] = (caddr_t)msg;

      /* initialize */
      p = (caddr_t) msg;
      ep = p + PFKEY_UNUNIT64(msg->sadb_msg_len);

      /* skip base header */
      p += sizeof(struct sadb_msg);

      while (p < ep) {
            ext = (struct sadb_ext *)p;
            if (ep < p + sizeof(*ext) || PFKEY_EXTLEN(ext) < sizeof(*ext) ||
                ep < p + PFKEY_EXTLEN(ext)) {
                  /* invalid format */
                  break;
            }

            /* duplicate check */
            /* XXX Are there duplication either KEY_AUTH or KEY_ENCRYPT ?*/
            if (mhp[ext->sadb_ext_type] != NULL) {
                  __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
                  return -1;
            }

            /* set pointer */
            switch (ext->sadb_ext_type) {
            case SADB_EXT_SA:
            case SADB_EXT_LIFETIME_CURRENT:
            case SADB_EXT_LIFETIME_HARD:
            case SADB_EXT_LIFETIME_SOFT:
            case SADB_EXT_ADDRESS_SRC:
            case SADB_EXT_ADDRESS_DST:
            case SADB_EXT_ADDRESS_PROXY:
            case SADB_EXT_KEY_AUTH:
                  /* XXX should to be check weak keys. */
            case SADB_EXT_KEY_ENCRYPT:
                  /* XXX should to be check weak keys. */
            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:
#ifdef SADB_X_EXT_NAT_T_TYPE
            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:
#endif
#ifdef SADB_X_EXT_TAG
            case SADB_X_EXT_TAG:
#endif
                  mhp[ext->sadb_ext_type] = (caddr_t)ext;
                  break;
            default:
                  __ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
                  return -1;
            }

            p += PFKEY_EXTLEN(ext);
      }

      if (p != ep) {
            __ipsec_errcode = EIPSEC_INVAL_SADBMSG;
            return -1;
      }

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return 0;
}

/*
 * check basic usage for sadb_msg,
 * NOTE: This routine is derived from netkey/key.c in KAME.
 * IN:      msg: pointer to message buffer.
 *    mhp: pointer to the buffer initialized like below:
 *
 *          caddr_t mhp[SADB_EXT_MAX + 1];
 *
 * OUT:     -1: invalid.
 *     0: valid.
 */
int
pfkey_check(mhp)
      caddr_t *mhp;
{
      struct sadb_msg *msg;

      /* validity check */
      if (mhp == NULL || mhp[0] == NULL) {
            __ipsec_errcode = EIPSEC_INVAL_ARGUMENT;
            return -1;
      }

      msg = (struct sadb_msg *)mhp[0];

      /* check version */
      if (msg->sadb_msg_version != PF_KEY_V2) {
            __ipsec_errcode = EIPSEC_INVAL_VERSION;
            return -1;
      }

      /* check type */
      if (msg->sadb_msg_type > SADB_MAX) {
            __ipsec_errcode = EIPSEC_INVAL_MSGTYPE;
            return -1;
      }

      /* 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:
#ifdef SADB_X_NAT_T_NEW_MAPPING
            case SADB_X_NAT_T_NEW_MAPPING:
#endif
                  __ipsec_errcode = EIPSEC_INVAL_SATYPE;
                  return -1;
            }
            break;
      case SADB_SATYPE_ESP:
      case SADB_SATYPE_AH:
      case SADB_X_SATYPE_IPCOMP:
            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:
                  __ipsec_errcode = EIPSEC_INVAL_SATYPE;
                  return -1;
            }
#ifdef SADB_X_NAT_T_NEW_MAPPING
            if (msg->sadb_msg_type == SADB_X_NAT_T_NEW_MAPPING &&
                msg->sadb_msg_satype != SADB_SATYPE_ESP) {
                  __ipsec_errcode = EIPSEC_INVAL_SATYPE;
                  return -1;
            }
#endif
            break;
      case SADB_SATYPE_RSVP:
      case SADB_SATYPE_OSPFV2:
      case SADB_SATYPE_RIPV2:
      case SADB_SATYPE_MIP:
            __ipsec_errcode = EIPSEC_NOT_SUPPORTED;
            return -1;
      case 1:     /* XXX: What does it do ? */
            if (msg->sadb_msg_type == SADB_X_PROMISC)
                  break;
            /*FALLTHROUGH*/
      default:
            __ipsec_errcode = EIPSEC_INVAL_SATYPE;
            return -1;
      }

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

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

            if (src0->sadb_address_proto != dst0->sadb_address_proto) {
                  __ipsec_errcode = EIPSEC_PROTO_MISMATCH;
                  return -1;
            }

            if (PFKEY_ADDR_SADDR(src0)->sa_family
             != PFKEY_ADDR_SADDR(dst0)->sa_family) {
                  __ipsec_errcode = EIPSEC_FAMILY_MISMATCH;
                  return -1;
            }

            switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
            case AF_INET:
            case AF_INET6:
                  break;
            default:
                  __ipsec_errcode = EIPSEC_INVAL_FAMILY;
                  return -1;
            }

            /*
             * prefixlen == 0 is valid because there must be the case
             * all addresses are matched.
             */
      }

      __ipsec_errcode = EIPSEC_NO_ERROR;
      return 0;
}

/*
 * set data into sadb_msg.
 * `buf' must has been allocated sufficiently.
 */
static caddr_t
pfkey_setsadbmsg(buf, lim, type, tlen, satype, seq, pid)
      caddr_t buf;
      caddr_t lim;
      u_int type, satype;
      u_int tlen;
      u_int32_t seq;
      pid_t pid;
{
      struct sadb_msg *p;
      u_int len;

      p = (struct sadb_msg *)buf;
      len = sizeof(struct sadb_msg);

      if (buf + len > lim)
            return NULL;

      memset(p, 0, 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 = 0;
      p->sadb_msg_seq = seq;
      p->sadb_msg_pid = (u_int32_t)pid;

      return(buf + len);
}

/*
 * copy secasvar data into sadb_address.
 * `buf' must has been allocated sufficiently.
 */
static caddr_t
pfkey_setsadbsa(buf, lim, spi, wsize, auth, enc, flags)
      caddr_t buf;
      caddr_t lim;
      u_int32_t spi, flags;
      u_int wsize, auth, enc;
{
      struct sadb_sa *p;
      u_int len;

      p = (struct sadb_sa *)buf;
      len = sizeof(struct sadb_sa);

      if (buf + len > lim)
            return NULL;

      memset(p, 0, len);
      p->sadb_sa_len = PFKEY_UNIT64(len);
      p->sadb_sa_exttype = SADB_EXT_SA;
      p->sadb_sa_spi = spi;
      p->sadb_sa_replay = wsize;
      p->sadb_sa_state = SADB_SASTATE_LARVAL;
      p->sadb_sa_auth = auth;
      p->sadb_sa_encrypt = enc;
      p->sadb_sa_flags = flags;

      return(buf + len);
}

/*
 * set data into sadb_address.
 * `buf' must has been allocated sufficiently.
 * prefixlen is in bits.
 */
static caddr_t
pfkey_setsadbaddr(buf, lim, exttype, saddr, prefixlen, ul_proto)
      caddr_t buf;
      caddr_t lim;
      u_int exttype;
      struct sockaddr *saddr;
      u_int prefixlen;
      u_int ul_proto;
{
      struct sadb_address *p;
      u_int len;

      p = (struct sadb_address *)buf;
      len = sizeof(struct sadb_address) + PFKEY_ALIGN8(sysdep_sa_len(saddr));

      if (buf + len > lim)
            return NULL;

      memset(p, 0, len);
      p->sadb_address_len = PFKEY_UNIT64(len);
      p->sadb_address_exttype = exttype & 0xffff;
      p->sadb_address_proto = ul_proto & 0xff;
      p->sadb_address_prefixlen = prefixlen;
      p->sadb_address_reserved = 0;

      memcpy(p + 1, saddr, sysdep_sa_len(saddr));

      return(buf + len);
}

/*
 * set sadb_key structure after clearing buffer with zero.
 * OUT: the pointer of buf + len.
 */
static caddr_t
pfkey_setsadbkey(buf, lim, type, key, keylen)
      caddr_t buf;
      caddr_t lim;
      caddr_t key;
      u_int type, keylen;
{
      struct sadb_key *p;
      u_int len;

      p = (struct sadb_key *)buf;
      len = sizeof(struct sadb_key) + PFKEY_ALIGN8(keylen);

      if (buf + len > lim)
            return NULL;

      memset(p, 0, len);
      p->sadb_key_len = PFKEY_UNIT64(len);
      p->sadb_key_exttype = type;
      p->sadb_key_bits = keylen << 3;
      p->sadb_key_reserved = 0;

      memcpy(p + 1, key, keylen);

      return buf + len;
}

/*
 * set sadb_lifetime structure after clearing buffer with zero.
 * OUT: the pointer of buf + len.
 */
static caddr_t
pfkey_setsadblifetime(buf, lim, type, l_alloc, l_bytes, l_addtime, l_usetime)
      caddr_t buf;
      caddr_t lim;
      u_int type;
      u_int32_t l_alloc, l_bytes, l_addtime, l_usetime;
{
      struct sadb_lifetime *p;
      u_int len;

      p = (struct sadb_lifetime *)buf;
      len = sizeof(struct sadb_lifetime);

      if (buf + len > lim)
            return NULL;

      memset(p, 0, len);
      p->sadb_lifetime_len = PFKEY_UNIT64(len);
      p->sadb_lifetime_exttype = type;

      switch (type) {
      case SADB_EXT_LIFETIME_SOFT:
            p->sadb_lifetime_allocations
                  = (l_alloc * soft_lifetime_allocations_rate) /100;
            p->sadb_lifetime_bytes
                  = (l_bytes * soft_lifetime_bytes_rate) /100;
            p->sadb_lifetime_addtime
                  = (l_addtime * soft_lifetime_addtime_rate) /100;
            p->sadb_lifetime_usetime
                  = (l_usetime * soft_lifetime_usetime_rate) /100;
            break;
      case SADB_EXT_LIFETIME_HARD:
            p->sadb_lifetime_allocations = l_alloc;
            p->sadb_lifetime_bytes = l_bytes;
            p->sadb_lifetime_addtime = l_addtime;
            p->sadb_lifetime_usetime = l_usetime;
            break;
      }

      return buf + len;
}

/*
 * copy secasvar data into sadb_address.
 * `buf' must has been allocated sufficiently.
 */
static caddr_t
pfkey_setsadbxsa2(buf, lim, mode0, reqid)
      caddr_t buf;
      caddr_t lim;
      u_int32_t mode0;
      u_int32_t reqid;
{
      struct sadb_x_sa2 *p;
      u_int8_t mode = mode0 & 0xff;
      u_int len;

      p = (struct sadb_x_sa2 *)buf;
      len = sizeof(struct sadb_x_sa2);

      if (buf + len > lim)
            return NULL;

      memset(p, 0, 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_reqid = reqid;

      return(buf + len);
}

#ifdef SADB_X_EXT_NAT_T_TYPE
static caddr_t
pfkey_set_natt_type(buf, lim, type, l_natt_type)
      caddr_t buf;
      caddr_t lim;
      u_int type;
      u_int8_t l_natt_type;
{
      struct sadb_x_nat_t_type *p;
      u_int len;

      p = (struct sadb_x_nat_t_type *)buf;
      len = sizeof(struct sadb_x_nat_t_type);

      if (buf + len > lim)
            return NULL;

      memset(p, 0, len);
      p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len);
      p->sadb_x_nat_t_type_exttype = type;
      p->sadb_x_nat_t_type_type = l_natt_type;

      return(buf + len);
}

static caddr_t
pfkey_set_natt_port(buf, lim, type, l_natt_port)
      caddr_t buf;
      caddr_t lim;
      u_int type;
      u_int16_t l_natt_port;
{
      struct sadb_x_nat_t_port *p;
      u_int len;

      p = (struct sadb_x_nat_t_port *)buf;
      len = sizeof(struct sadb_x_nat_t_port);

      if (buf + len > lim)
            return NULL;

      memset(p, 0, 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 = htons(l_natt_port);

      return(buf + len);
}
#endif

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