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pfkey_v2_build.c

/*
 * RFC2367 PF_KEYv2 Key management API message parser
 * Copyright (C) 1999, 2000, 2001  Richard Guy Briggs.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * RCSID $Id: pfkey_v2_build.c,v 1.4 2005/04/07 19:43:52 as Exp $
 */

/*
 *          Template from klips/net/ipsec/ipsec/ipsec_parser.c.
 */

char pfkey_v2_build_c_version[] = "$Id: pfkey_v2_build.c,v 1.4 2005/04/07 19:43:52 as Exp $";

/*
 * Some ugly stuff to allow consistent debugging code for use in the
 * kernel and in user space
*/

#ifdef __KERNEL__

# include <linux/kernel.h>  /* for printk */

# include "freeswan/ipsec_kversion.h" /* for malloc switch */
# ifdef MALLOC_SLAB
#  include <linux/slab.h> /* kmalloc() */
# else /* MALLOC_SLAB */
#  include <linux/malloc.h> /* kmalloc() */
# endif /* MALLOC_SLAB */
# include <linux/errno.h>  /* error codes */
# include <linux/types.h>  /* size_t */
# include <linux/interrupt.h> /* mark_bh */

# include <linux/netdevice.h>   /* struct device, and other headers */
# include <linux/etherdevice.h> /* eth_type_trans */
# include <linux/ip.h>          /* struct iphdr */ 
# if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#  include <linux/ipv6.h>        /* struct ipv6hdr */
# endif /* if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */

# define MALLOC(size) kmalloc(size, GFP_ATOMIC)
# define FREE(obj) kfree(obj)
# include <freeswan.h>
#else /* __KERNEL__ */

# include <sys/types.h>
# include <linux/types.h>
# include <linux/errno.h>
# include <malloc.h>
# include <string.h> /* memset */

# include <freeswan.h>
unsigned int pfkey_lib_debug = 0;

void (*pfkey_debug_func)(const char *message, ...) PRINTF_LIKE(1);

/* #define PLUTO */

#define DEBUGGING(args...)  if(pfkey_lib_debug) { \
                              if(pfkey_debug_func != NULL) { \
                                (*pfkey_debug_func)("pfkey_lib_debug:" args); \
                              } else { \
                                printf("pfkey_lib_debug:" args); \
                              } }
# define MALLOC(size) malloc(size)
# define FREE(obj) free(obj)
#endif /* __KERNEL__ */

#include <pfkeyv2.h>
#include <pfkey.h>

#ifdef __KERNEL__

#include "freeswan/radij.h"  /* rd_nodes */
#include "freeswan/ipsec_encap.h"  /* sockaddr_encap */

# define DEBUGGING(args...) \
         KLIPS_PRINT(debug_pfkey, "klips_debug:" args)
#endif /* __KERNEL__ */

#include "freeswan/ipsec_sa.h"  /* IPSEC_SAREF_NULL, IPSEC_SA_REF_TABLE_IDX_WIDTH */

#define SENDERR(_x) do { error = -(_x); goto errlab; } while (0)

void
pfkey_extensions_init(struct sadb_ext *extensions[SADB_EXT_MAX + 1])
{
      int i;
      
      for (i = 0; i != SADB_EXT_MAX + 1; i++) {
            extensions[i] = NULL;
      }
}

void
pfkey_extensions_free(struct sadb_ext *extensions[SADB_EXT_MAX + 1])
{
      int i;
      
      if (!extensions) {
            return;
      }

      if (extensions[0]) {
            memset(extensions[0], 0, sizeof(struct sadb_msg));
            FREE(extensions[0]);
            extensions[0] = NULL;
      }
      
      for (i = 1; i != SADB_EXT_MAX + 1; i++) {
            if(extensions[i]) {
                  memset(extensions[i], 0, extensions[i]->sadb_ext_len * IPSEC_PFKEYv2_ALIGN);
                  FREE(extensions[i]);
                  extensions[i] = NULL;
            }
      }
}

void
pfkey_msg_free(struct sadb_msg **pfkey_msg)
{
      if (*pfkey_msg) {
            memset(*pfkey_msg, 0, (*pfkey_msg)->sadb_msg_len * IPSEC_PFKEYv2_ALIGN);
            FREE(*pfkey_msg);
            *pfkey_msg = NULL;
      }
}

/* Default extension builders taken from the KLIPS code */

int
pfkey_msg_hdr_build(struct sadb_ext**     pfkey_ext,
                uint8_t       msg_type,
                uint8_t       satype,
                uint8_t       msg_errno,
                uint32_t            seq,
                uint32_t            pid)
{
      int error = 0;
      struct sadb_msg *pfkey_msg = (struct sadb_msg *)*pfkey_ext;

      DEBUGGING(
            "pfkey_msg_hdr_build:\n");
      DEBUGGING(
            "pfkey_msg_hdr_build: "
            "on_entry &pfkey_ext=0p%p pfkey_ext=0p%p *pfkey_ext=0p%p.\n",
            &pfkey_ext,
            pfkey_ext,
            *pfkey_ext);
      /* sanity checks... */
      if (pfkey_msg) {
            DEBUGGING(
                  "pfkey_msg_hdr_build: "
                  "why is pfkey_msg already pointing to something?\n");
            SENDERR(EINVAL);
      }

      if (!msg_type) {
            DEBUGGING(
                  "pfkey_msg_hdr_build: "
                  "msg type not set, must be non-zero..\n");
            SENDERR(EINVAL);
      }

      if (msg_type > SADB_MAX) {
            DEBUGGING(
                  "pfkey_msg_hdr_build: "
                  "msg type too large:%d.\n",
                  msg_type);
            SENDERR(EINVAL);
      }

      if (satype > SADB_SATYPE_MAX) {
            DEBUGGING(
                  "pfkey_msg_hdr_build: "
                  "satype %d > max %d\n", 
                  satype, SADB_SATYPE_MAX);
            SENDERR(EINVAL);
      }

      pfkey_msg = (struct sadb_msg*)MALLOC(sizeof(struct sadb_msg));
      *pfkey_ext = (struct sadb_ext*)pfkey_msg;

      if (pfkey_msg == NULL) {
            DEBUGGING(
                  "pfkey_msg_hdr_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_msg, 0, sizeof(struct sadb_msg));

      pfkey_msg->sadb_msg_len = sizeof(struct sadb_msg) / IPSEC_PFKEYv2_ALIGN;

      pfkey_msg->sadb_msg_type = msg_type;
      pfkey_msg->sadb_msg_satype = satype;

      pfkey_msg->sadb_msg_version = PF_KEY_V2;
      pfkey_msg->sadb_msg_errno = msg_errno;
      pfkey_msg->sadb_msg_reserved = 0;
      pfkey_msg->sadb_msg_seq = seq;
      pfkey_msg->sadb_msg_pid = pid;
      DEBUGGING(
            "pfkey_msg_hdr_build: "
            "on_exit &pfkey_ext=0p%p pfkey_ext=0p%p *pfkey_ext=0p%p.\n",
            &pfkey_ext,
            pfkey_ext,
            *pfkey_ext);
errlab:
      return error;
}     

int
pfkey_sa_ref_build(struct sadb_ext **           pfkey_ext,
               uint16_t             exttype,
               uint32_t             spi,
               uint8_t              replay_window,
               uint8_t              sa_state,
               uint8_t              auth,
               uint8_t              encrypt,
               uint32_t             flags,
               uint32_t/*IPsecSAref_t*/   ref)
{
      int error = 0;
      struct sadb_sa *pfkey_sa = (struct sadb_sa *)*pfkey_ext;

      DEBUGGING(
                "pfkey_sa_build: "
                "spi=%08x replay=%d sa_state=%d auth=%d encrypt=%d flags=%d\n",
                ntohl(spi), /* in network order */
                replay_window,
                sa_state,
                auth,
                encrypt,
                flags);
      /* sanity checks... */
      if (pfkey_sa) {
            DEBUGGING(
                  "pfkey_sa_build: "
                  "why is pfkey_sa already pointing to something?\n");
            SENDERR(EINVAL);
      }

      if (exttype != SADB_EXT_SA
      &&  exttype != SADB_X_EXT_SA2) {
            DEBUGGING(
                  "pfkey_sa_build: "
                  "invalid exttype=%d.\n",
                  exttype);
            SENDERR(EINVAL);
      }

      if (replay_window > 64) {
            DEBUGGING(
                  "pfkey_sa_build: "
                  "replay window size: %d -- must be 0 <= size <= 64\n",
                  replay_window);
            SENDERR(EINVAL);
      }

      if (auth > SADB_AALG_MAX) {
            DEBUGGING(
                  "pfkey_sa_build: "
                  "auth=%d > SADB_AALG_MAX=%d.\n",
                  auth,
                  SADB_AALG_MAX);
            SENDERR(EINVAL);
      }

      if (encrypt > SADB_EALG_MAX) {
            DEBUGGING(
                  "pfkey_sa_build: "
                  "encrypt=%d > SADB_EALG_MAX=%d.\n",
                  encrypt,
                  SADB_EALG_MAX);
            SENDERR(EINVAL);
      }

      if (sa_state > SADB_SASTATE_MAX) {
            DEBUGGING(
                  "pfkey_sa_build: "
                  "sa_state=%d exceeds MAX=%d.\n",
                  sa_state,
                  SADB_SASTATE_MAX);
            SENDERR(EINVAL);
      }

      if (sa_state == SADB_SASTATE_DEAD) {
            DEBUGGING(
                  "pfkey_sa_build: "
                  "sa_state=%d is DEAD=%d is not allowed.\n",
                  sa_state,
                  SADB_SASTATE_DEAD);
            SENDERR(EINVAL);
      }
      
      if ((IPSEC_SAREF_NULL != ref) && (ref >= (1 << IPSEC_SA_REF_TABLE_IDX_WIDTH))) {
            DEBUGGING(
                    "pfkey_sa_build: "
                    "SAref=%d must be (SAref == IPSEC_SAREF_NULL(%d) || SAref < IPSEC_SA_REF_TABLE_NUM_ENTRIES(%d)).\n",
                    ref,
                    IPSEC_SAREF_NULL,
                    IPSEC_SA_REF_TABLE_NUM_ENTRIES);
            SENDERR(EINVAL);
      }
      
      pfkey_sa = (struct sadb_sa*)MALLOC(sizeof(struct sadb_sa));
      *pfkey_ext = (struct sadb_ext*)pfkey_sa;

      if (pfkey_sa == NULL) {
            DEBUGGING(
                  "pfkey_sa_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_sa, 0, sizeof(struct sadb_sa));
      
      pfkey_sa->sadb_sa_len = sizeof(*pfkey_sa) / IPSEC_PFKEYv2_ALIGN;
      pfkey_sa->sadb_sa_exttype = exttype;
      pfkey_sa->sadb_sa_spi = spi;
      pfkey_sa->sadb_sa_replay = replay_window;
      pfkey_sa->sadb_sa_state = sa_state;
      pfkey_sa->sadb_sa_auth = auth;
      pfkey_sa->sadb_sa_encrypt = encrypt;
      pfkey_sa->sadb_sa_flags = flags;
      pfkey_sa->sadb_x_sa_ref = ref;  

errlab:
      return error;
}     

int
pfkey_sa_build(struct sadb_ext **   pfkey_ext,
             uint16_t               exttype,
             uint32_t               spi,
             uint8_t                replay_window,
             uint8_t                sa_state,
             uint8_t                auth,
             uint8_t                encrypt,
             uint32_t               flags)
{
      return pfkey_sa_ref_build(pfkey_ext,
                     exttype,
                     spi,
                     replay_window,
                     sa_state,
                     auth,
                     encrypt,
                     flags,
                     IPSEC_SAREF_NULL);
}

int
pfkey_lifetime_build(struct sadb_ext **   pfkey_ext,
                 uint16_t           exttype,
                 uint32_t           allocations,
                 uint64_t           bytes,
                 uint64_t           addtime,
                 uint64_t           usetime,
                 uint32_t           packets)
{
      int error = 0;
      struct sadb_lifetime *pfkey_lifetime = (struct sadb_lifetime *)*pfkey_ext;

      DEBUGGING(
            "pfkey_lifetime_build:\n");
      /* sanity checks... */
      if (pfkey_lifetime) {
            DEBUGGING(
                  "pfkey_lifetime_build: "
                  "why is pfkey_lifetime already pointing to something?\n");
            SENDERR(EINVAL);
      }

      if (exttype != SADB_EXT_LIFETIME_CURRENT
      &&  exttype != SADB_EXT_LIFETIME_HARD
      &&  exttype != SADB_EXT_LIFETIME_SOFT) {
            DEBUGGING(
                  "pfkey_lifetime_build: "
                  "invalid exttype=%d.\n",
                  exttype);
            SENDERR(EINVAL);
      }

      pfkey_lifetime = (struct sadb_lifetime*)MALLOC(sizeof(struct sadb_lifetime));
      *pfkey_ext = (struct sadb_ext*)pfkey_lifetime;

      if (pfkey_lifetime == NULL) {
            DEBUGGING(
                  "pfkey_lifetime_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_lifetime, 0, sizeof(struct sadb_lifetime));

      pfkey_lifetime->sadb_lifetime_len = sizeof(struct sadb_lifetime) / IPSEC_PFKEYv2_ALIGN;
      pfkey_lifetime->sadb_lifetime_exttype = exttype;
      pfkey_lifetime->sadb_lifetime_allocations = allocations;
      pfkey_lifetime->sadb_lifetime_bytes = bytes;
      pfkey_lifetime->sadb_lifetime_addtime = addtime;
      pfkey_lifetime->sadb_lifetime_usetime = usetime;
      pfkey_lifetime->sadb_x_lifetime_packets = packets;

errlab:
      return error;
}

int
pfkey_address_build(struct sadb_ext**     pfkey_ext,
                uint16_t            exttype,
                uint8_t       proto,
                uint8_t       prefixlen,
                struct sockaddr*    address)
{
      int error = 0;
      int saddr_len = 0;
      char ipaddr_txt[ADDRTOT_BUF + 6/*extra for port number*/];
      struct sadb_address *pfkey_address = (struct sadb_address *)*pfkey_ext;
      
      DEBUGGING(
            "pfkey_address_build: "
            "exttype=%d proto=%d prefixlen=%d\n",
            exttype,
            proto,
            prefixlen);
      /* sanity checks... */
      if (pfkey_address) {
            DEBUGGING(
                  "pfkey_address_build: "
                  "why is pfkey_address already pointing to something?\n");
            SENDERR(EINVAL);
      }

      if (!address)  {
                  DEBUGGING("pfkey_address_build: "
                          "address is NULL\n");
                  SENDERR(EINVAL);
      }
      
      switch(exttype) { 
      case SADB_EXT_ADDRESS_SRC:
      case SADB_EXT_ADDRESS_DST:
      case SADB_EXT_ADDRESS_PROXY:
      case SADB_X_EXT_ADDRESS_DST2:
      case SADB_X_EXT_ADDRESS_SRC_FLOW:
      case SADB_X_EXT_ADDRESS_DST_FLOW:
      case SADB_X_EXT_ADDRESS_SRC_MASK:
      case SADB_X_EXT_ADDRESS_DST_MASK:
#ifdef NAT_TRAVERSAL
      case SADB_X_EXT_NAT_T_OA:
#endif      
            break;
      default:
            DEBUGGING( 
                  "pfkey_address_build: "
                  "unrecognised ext_type=%d.\n", 
                  exttype); 
            SENDERR(EINVAL); 
      }

      switch (address->sa_family) {
      case AF_INET:
            DEBUGGING(
                  "pfkey_address_build: "
                  "found address family AF_INET.\n");
            saddr_len = sizeof(struct sockaddr_in);
            sprintf(ipaddr_txt, "%d.%d.%d.%d:%d"
                  , (((struct sockaddr_in*)address)->sin_addr.s_addr >>  0) & 0xFF
                  , (((struct sockaddr_in*)address)->sin_addr.s_addr >>  8) & 0xFF
                  , (((struct sockaddr_in*)address)->sin_addr.s_addr >> 16) & 0xFF
                  , (((struct sockaddr_in*)address)->sin_addr.s_addr >> 24) & 0xFF
                  , ntohs(((struct sockaddr_in*)address)->sin_port));
            break;
      case AF_INET6:
            DEBUGGING(
                  "pfkey_address_build: "
                  "found address family AF_INET6.\n");
            saddr_len = sizeof(struct sockaddr_in6);
            sprintf(ipaddr_txt, "%x:%x:%x:%x:%x:%x:%x:%x-%x"
                  , ntohs(((struct sockaddr_in6*)address)->sin6_addr.s6_addr16[0])
                  , ntohs(((struct sockaddr_in6*)address)->sin6_addr.s6_addr16[1])
                  , ntohs(((struct sockaddr_in6*)address)->sin6_addr.s6_addr16[2])
                  , ntohs(((struct sockaddr_in6*)address)->sin6_addr.s6_addr16[3])
                  , ntohs(((struct sockaddr_in6*)address)->sin6_addr.s6_addr16[4])
                  , ntohs(((struct sockaddr_in6*)address)->sin6_addr.s6_addr16[5])
                  , ntohs(((struct sockaddr_in6*)address)->sin6_addr.s6_addr16[6])
                  , ntohs(((struct sockaddr_in6*)address)->sin6_addr.s6_addr16[7])
                  , ntohs(((struct sockaddr_in6*)address)->sin6_port));
            break;
      default:
            DEBUGGING(
                  "pfkey_address_build: "
                  "address->sa_family=%d not supported.\n",
                  address->sa_family);
            SENDERR(EPFNOSUPPORT);
      }

      DEBUGGING(
            "pfkey_address_build: "
            "found address=%s.\n",
            ipaddr_txt);
      if (prefixlen != 0) {
            DEBUGGING(
                  "pfkey_address_build: "
                  "address prefixes not supported yet.\n");
            SENDERR(EAFNOSUPPORT); /* not supported yet */
      }

      pfkey_address = (struct sadb_address*)
            MALLOC(ALIGN_N(sizeof(struct sadb_address) + saddr_len, IPSEC_PFKEYv2_ALIGN));
      *pfkey_ext = (struct sadb_ext*)pfkey_address;

      if (pfkey_address == NULL) {
            DEBUGGING(
                  "pfkey_lifetime_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_address,
             0,
             ALIGN_N(sizeof(struct sadb_address) + saddr_len,
                 IPSEC_PFKEYv2_ALIGN));
             
      pfkey_address->sadb_address_len = DIVUP(sizeof(struct sadb_address) + saddr_len,
                                    IPSEC_PFKEYv2_ALIGN);
      
      pfkey_address->sadb_address_exttype = exttype;
      pfkey_address->sadb_address_proto = proto;
      pfkey_address->sadb_address_prefixlen = prefixlen;
      pfkey_address->sadb_address_reserved = 0;

      memcpy((char*)pfkey_address + sizeof(struct sadb_address),
             address,
             saddr_len);

#if 0
      for (i = 0; i < sizeof(struct sockaddr_in) - offsetof(struct sockaddr_in, sin_zero); i++) {
            pfkey_address_s_ska.sin_zero[i] = 0;
      }
#endif
      DEBUGGING(
            "pfkey_address_build: "
            "successful.\n");

 errlab:
      return error;
}

int
pfkey_key_build(struct sadb_ext**   pfkey_ext,
            uint16_t          exttype,
            uint16_t          key_bits,
            char*             key)
{
      int error = 0;
      struct sadb_key *pfkey_key = (struct sadb_key *)*pfkey_ext;

      DEBUGGING(
            "pfkey_key_build:\n");
      /* sanity checks... */
      if (pfkey_key) {
            DEBUGGING(
                  "pfkey_key_build: "
                  "why is pfkey_key already pointing to something?\n");
            SENDERR(EINVAL);
      }

      if (!key_bits) {
            DEBUGGING(
                  "pfkey_key_build: "
                  "key_bits is zero, it must be non-zero.\n");
            SENDERR(EINVAL);
      }

      if ( !((exttype == SADB_EXT_KEY_AUTH) || (exttype == SADB_EXT_KEY_ENCRYPT))) {
            DEBUGGING(
                  "pfkey_key_build: "
                  "unsupported extension type=%d.\n",
                  exttype);
            SENDERR(EINVAL);
      }

      pfkey_key = (struct sadb_key*)
            MALLOC(sizeof(struct sadb_key) + 
                  DIVUP(key_bits, 64) * IPSEC_PFKEYv2_ALIGN);
      *pfkey_ext = (struct sadb_ext*)pfkey_key;

      if (pfkey_key == NULL) {
            DEBUGGING(
                  "pfkey_key_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_key,
             0,
             sizeof(struct sadb_key) +
             DIVUP(key_bits, 64) * IPSEC_PFKEYv2_ALIGN);
      
      pfkey_key->sadb_key_len = DIVUP(sizeof(struct sadb_key) * IPSEC_PFKEYv2_ALIGN +     key_bits,
                              64);
      pfkey_key->sadb_key_exttype = exttype;
      pfkey_key->sadb_key_bits = key_bits;
      pfkey_key->sadb_key_reserved = 0;
      memcpy((char*)pfkey_key + sizeof(struct sadb_key),
             key,
             DIVUP(key_bits, 8));

errlab:
      return error;
}

int
pfkey_ident_build(struct sadb_ext** pfkey_ext,
              uint16_t        exttype,
              uint16_t        ident_type,
              uint64_t        ident_id,
              uint8_t               ident_len,
              char*                 ident_string)
{
      int error = 0;
      struct sadb_ident *pfkey_ident = (struct sadb_ident *)*pfkey_ext;
      int data_len = ident_len * IPSEC_PFKEYv2_ALIGN - sizeof(struct sadb_ident);

      DEBUGGING(
            "pfkey_ident_build:\n");
      /* sanity checks... */
      if (pfkey_ident) {
            DEBUGGING(
                  "pfkey_ident_build: "
                  "why is pfkey_ident already pointing to something?\n");
            SENDERR(EINVAL);
      }

      if ( !((exttype == SADB_EXT_IDENTITY_SRC) ||
             (exttype == SADB_EXT_IDENTITY_DST))) {
            DEBUGGING(
                  "pfkey_ident_build: "
                  "unsupported extension type=%d.\n",
                  exttype);
            SENDERR(EINVAL);
      }

      if (ident_type == SADB_IDENTTYPE_RESERVED) {
            DEBUGGING(
                  "pfkey_ident_build: "
                  "ident_type must be non-zero.\n");
            SENDERR(EINVAL);
      }

      if (ident_type > SADB_IDENTTYPE_MAX) {
            DEBUGGING(
                  "pfkey_ident_build: "
                  "identtype=%d out of range.\n",
                  ident_type);
            SENDERR(EINVAL);
      }

      if ((ident_type == SADB_IDENTTYPE_PREFIX ||
          ident_type == SADB_IDENTTYPE_FQDN) &&
         !ident_string) {
            DEBUGGING(
                  "pfkey_ident_build: "
                  "string required to allocate size of extension.\n");
            SENDERR(EINVAL);
      }
      
#if 0
      if (ident_type == SADB_IDENTTYPE_USERFQDN) {
      }
#endif
          
      pfkey_ident = (struct sadb_ident*)
            MALLOC(ident_len * IPSEC_PFKEYv2_ALIGN);
      *pfkey_ext = (struct sadb_ext*)pfkey_ident;

      if (pfkey_ident == NULL) {
            DEBUGGING(
                  "pfkey_ident_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_ident, 0, ident_len * IPSEC_PFKEYv2_ALIGN);
      
      pfkey_ident->sadb_ident_len = ident_len;
      pfkey_ident->sadb_ident_exttype = exttype;
      pfkey_ident->sadb_ident_type = ident_type;
      pfkey_ident->sadb_ident_reserved = 0;
      pfkey_ident->sadb_ident_id = ident_id;
      memcpy((char*)pfkey_ident + sizeof(struct sadb_ident),
             ident_string,
             data_len);

errlab:
      return error;
}

int
pfkey_sens_build(struct sadb_ext**  pfkey_ext,
             uint32_t         dpd,
             uint8_t          sens_level,
             uint8_t          sens_len,
             uint64_t*        sens_bitmap,
             uint8_t          integ_level,
             uint8_t          integ_len,
             uint64_t*        integ_bitmap)
{
      int error = 0;
      struct sadb_sens *pfkey_sens = (struct sadb_sens *)*pfkey_ext;
      int i;
      uint64_t* bitmap;

      DEBUGGING(
            "pfkey_sens_build:\n");
      /* sanity checks... */
      if (pfkey_sens) {
            DEBUGGING(
                  "pfkey_sens_build: "
                  "why is pfkey_sens already pointing to something?\n");
            SENDERR(EINVAL);
      }

      DEBUGGING(
            "pfkey_sens_build: "
            "Sorry, I can't build exttype=%d yet.\n",
            (*pfkey_ext)->sadb_ext_type);
      SENDERR(EINVAL); /* don't process these yet */

      pfkey_sens = (struct sadb_sens*)
            MALLOC(sizeof(struct sadb_sens) +
                  (sens_len + integ_len) * sizeof(uint64_t));
      *pfkey_ext = (struct sadb_ext*)pfkey_sens;

      if (pfkey_sens == NULL) {
            DEBUGGING(
                  "pfkey_sens_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_sens,
             0,
             sizeof(struct sadb_sens) +
             (sens_len + integ_len) * sizeof(uint64_t));
      
      pfkey_sens->sadb_sens_len = (sizeof(struct sadb_sens) +
                (sens_len + integ_len) * sizeof(uint64_t)) / IPSEC_PFKEYv2_ALIGN;
      pfkey_sens->sadb_sens_exttype = SADB_EXT_SENSITIVITY;
      pfkey_sens->sadb_sens_dpd = dpd;
      pfkey_sens->sadb_sens_sens_level = sens_level;
      pfkey_sens->sadb_sens_sens_len = sens_len;
      pfkey_sens->sadb_sens_integ_level = integ_level;
      pfkey_sens->sadb_sens_integ_len = integ_len;
      pfkey_sens->sadb_sens_reserved = 0;

      bitmap = (uint64_t*)((char*)pfkey_ext + sizeof(struct sadb_sens));
      for (i = 0; i < sens_len; i++) {
            *bitmap = sens_bitmap[i];
            bitmap++;
      }
      for (i = 0; i < integ_len; i++) {
            *bitmap = integ_bitmap[i];
            bitmap++;
      }

errlab:
      return error;
}

int
pfkey_prop_build(struct sadb_ext**  pfkey_ext,
             uint8_t          replay,
             unsigned int           comb_num,
             struct sadb_comb*      comb)
{
      int error = 0;
      int i;
      struct sadb_prop *pfkey_prop = (struct sadb_prop *)*pfkey_ext;
      struct sadb_comb *combp;

      DEBUGGING(
            "pfkey_prop_build:\n");
      /* sanity checks... */
      if (pfkey_prop) {
            DEBUGGING(
                  "pfkey_prop_build: "
                  "why is pfkey_prop already pointing to something?\n");
            SENDERR(EINVAL);
      }

      pfkey_prop = (struct sadb_prop*)
            MALLOC(sizeof(struct sadb_prop) +
                  comb_num * sizeof(struct sadb_comb));

      *pfkey_ext = (struct sadb_ext*)pfkey_prop;

      if (pfkey_prop == NULL) {
            DEBUGGING(
                  "pfkey_prop_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_prop,
             0,
             sizeof(struct sadb_prop) +
                comb_num * sizeof(struct sadb_comb));
      
      pfkey_prop->sadb_prop_len = (sizeof(struct sadb_prop) +
                comb_num * sizeof(struct sadb_comb)) / IPSEC_PFKEYv2_ALIGN;

      pfkey_prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
      pfkey_prop->sadb_prop_replay = replay;

      for (i=0; i<3; i++) {
            pfkey_prop->sadb_prop_reserved[i] = 0;
      }

      combp = (struct sadb_comb*)((char*)*pfkey_ext + sizeof(struct sadb_prop));
      for (i = 0; i < comb_num; i++) {
            memcpy (combp, &(comb[i]), sizeof(struct sadb_comb));
            combp++;
      }

#if 0
  uint8_t sadb_comb_auth;
  uint8_t sadb_comb_encrypt;
  uint16_t sadb_comb_flags;
  uint16_t sadb_comb_auth_minbits;
  uint16_t sadb_comb_auth_maxbits;
  uint16_t sadb_comb_encrypt_minbits;
  uint16_t sadb_comb_encrypt_maxbits;
  uint32_t sadb_comb_reserved;
  uint32_t sadb_comb_soft_allocations;
  uint32_t sadb_comb_hard_allocations;
  uint64_t sadb_comb_soft_bytes;
  uint64_t sadb_comb_hard_bytes;
  uint64_t sadb_comb_soft_addtime;
  uint64_t sadb_comb_hard_addtime;
  uint64_t sadb_comb_soft_usetime;
  uint64_t sadb_comb_hard_usetime;
  uint32_t sadb_comb_soft_packets;
  uint32_t sadb_comb_hard_packets;
#endif
errlab:
      return error;
}

int
pfkey_supported_build(struct sadb_ext**   pfkey_ext,
                  uint16_t          exttype,
                  unsigned int      alg_num,
                  struct sadb_alg*  alg)
{
      int error = 0;
      unsigned int i;
      struct sadb_supported *pfkey_supported = (struct sadb_supported *)*pfkey_ext;
      struct sadb_alg *pfkey_alg;

      /* sanity checks... */
      if (pfkey_supported) {
            DEBUGGING(
                  "pfkey_supported_build: "
                  "why is pfkey_supported already pointing to something?\n");
            SENDERR(EINVAL);
      }

      if ( !((exttype == SADB_EXT_SUPPORTED_AUTH) || (exttype == SADB_EXT_SUPPORTED_ENCRYPT))) {
            DEBUGGING(
                  "pfkey_supported_build: "
                  "unsupported extension type=%d.\n",
                  exttype);
            SENDERR(EINVAL);
      }

      pfkey_supported = (struct sadb_supported*)
            MALLOC(sizeof(struct sadb_supported) +
                  alg_num * sizeof(struct sadb_alg));

      *pfkey_ext = (struct sadb_ext*)pfkey_supported;

      if (pfkey_supported == NULL) {
            DEBUGGING(
                  "pfkey_supported_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_supported,
             0,
             sizeof(struct sadb_supported) +
                                     alg_num *
                                     sizeof(struct sadb_alg));
      
      pfkey_supported->sadb_supported_len = (sizeof(struct sadb_supported) +
                                     alg_num *
                                     sizeof(struct sadb_alg)) /
                                    IPSEC_PFKEYv2_ALIGN;
      pfkey_supported->sadb_supported_exttype = exttype;
      pfkey_supported->sadb_supported_reserved = 0;

      pfkey_alg = (struct sadb_alg*)((char*)pfkey_supported + sizeof(struct sadb_supported));
      for(i = 0; i < alg_num; i++) {
            memcpy (pfkey_alg, &(alg[i]), sizeof(struct sadb_alg));
            pfkey_alg->sadb_alg_reserved = 0;
            pfkey_alg++;
      }
      
#if 0
      DEBUGGING(
            "pfkey_supported_build: "
            "Sorry, I can't build exttype=%d yet.\n",
            (*pfkey_ext)->sadb_ext_type);
      SENDERR(EINVAL); /* don't process these yet */

  uint8_t sadb_alg_id;
  uint8_t sadb_alg_ivlen;
  uint16_t sadb_alg_minbits;
  uint16_t sadb_alg_maxbits;
  uint16_t sadb_alg_reserved;
#endif
errlab:
      return error;
}

int
pfkey_spirange_build(struct sadb_ext**    pfkey_ext,
                 uint16_t           exttype,
                 uint32_t           min, /* in network order */
                 uint32_t           max) /* in network order */
{
      int error = 0;
      struct sadb_spirange *pfkey_spirange = (struct sadb_spirange *)*pfkey_ext;
      
      /* sanity checks... */
      if (pfkey_spirange) {
            DEBUGGING(
                  "pfkey_spirange_build: "
                  "why is pfkey_spirange already pointing to something?\n");
            SENDERR(EINVAL);
      }
      
        if (ntohl(max) < ntohl(min)) {
            DEBUGGING(
                  "pfkey_spirange_build: "
                  "minspi=%08x must be < maxspi=%08x.\n",
                  ntohl(min),
                  ntohl(max));
                SENDERR(EINVAL);
        }
      
      if (ntohl(min) <= 255) {
            DEBUGGING(
                  "pfkey_spirange_build: "
                  "minspi=%08x must be > 255.\n",
                  ntohl(min));
            SENDERR(EEXIST);
      }
      
      pfkey_spirange = (struct sadb_spirange*)
            MALLOC(sizeof(struct sadb_spirange));
      *pfkey_ext = (struct sadb_ext*)pfkey_spirange;

      if (pfkey_spirange == NULL) {
            DEBUGGING(
                  "pfkey_spirange_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_spirange,
             0,
             sizeof(struct sadb_spirange));
      
        pfkey_spirange->sadb_spirange_len = sizeof(struct sadb_spirange) / IPSEC_PFKEYv2_ALIGN;

      pfkey_spirange->sadb_spirange_exttype = SADB_EXT_SPIRANGE;
      pfkey_spirange->sadb_spirange_min = min;
      pfkey_spirange->sadb_spirange_max = max;
      pfkey_spirange->sadb_spirange_reserved = 0;
 errlab:
      return error;
}

int
pfkey_x_kmprivate_build(struct sadb_ext** pfkey_ext)
{
      int error = 0;
      struct sadb_x_kmprivate *pfkey_x_kmprivate = (struct sadb_x_kmprivate *)*pfkey_ext;

      /* sanity checks... */
      if (pfkey_x_kmprivate) {
            DEBUGGING(
                  "pfkey_x_kmprivate_build: "
                  "why is pfkey_x_kmprivate already pointing to something?\n");
            SENDERR(EINVAL);
      }
      
      pfkey_x_kmprivate->sadb_x_kmprivate_reserved = 0;

      DEBUGGING(
            "pfkey_x_kmprivate_build: "
            "Sorry, I can't build exttype=%d yet.\n",
            (*pfkey_ext)->sadb_ext_type);
      SENDERR(EINVAL); /* don't process these yet */

      pfkey_x_kmprivate = (struct sadb_x_kmprivate*)
            MALLOC(sizeof(struct sadb_x_kmprivate));
      *pfkey_ext = (struct sadb_ext*)pfkey_x_kmprivate;

      if (pfkey_x_kmprivate == NULL) {
            DEBUGGING(
                  "pfkey_x_kmprivate_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_x_kmprivate,
             0,
             sizeof(struct sadb_x_kmprivate));
      
        pfkey_x_kmprivate->sadb_x_kmprivate_len =
            sizeof(struct sadb_x_kmprivate) / IPSEC_PFKEYv2_ALIGN;

        pfkey_x_kmprivate->sadb_x_kmprivate_exttype = SADB_X_EXT_KMPRIVATE;
        pfkey_x_kmprivate->sadb_x_kmprivate_reserved = 0;
errlab:
      return error;
}

int
pfkey_x_satype_build(struct sadb_ext**    pfkey_ext,
                 uint8_t            satype)
{
      int error = 0;
      int i;
      struct sadb_x_satype *pfkey_x_satype = (struct sadb_x_satype *)*pfkey_ext;

      DEBUGGING(
            "pfkey_x_satype_build:\n");
      /* sanity checks... */
      if (pfkey_x_satype) {
            DEBUGGING(
                  "pfkey_x_satype_build: "
                  "why is pfkey_x_satype already pointing to something?\n");
            SENDERR(EINVAL);
      }
      
      if (!satype) {
            DEBUGGING(
                  "pfkey_x_satype_build: "
                  "SA type not set, must be non-zero.\n");
            SENDERR(EINVAL);
      }

      if (satype > SADB_SATYPE_MAX) {
            DEBUGGING(
                  "pfkey_x_satype_build: "
                  "satype %d > max %d\n", 
                  satype, SADB_SATYPE_MAX);
            SENDERR(EINVAL);
      }

      pfkey_x_satype = (struct sadb_x_satype*)
           MALLOC(sizeof(struct sadb_x_satype));

      *pfkey_ext = (struct sadb_ext*)pfkey_x_satype;

      if (pfkey_x_satype == NULL) {
            DEBUGGING(
                  "pfkey_x_satype_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      memset(pfkey_x_satype,
             0,
             sizeof(struct sadb_x_satype));
      
        pfkey_x_satype->sadb_x_satype_len = sizeof(struct sadb_x_satype) / IPSEC_PFKEYv2_ALIGN;

      pfkey_x_satype->sadb_x_satype_exttype = SADB_X_EXT_SATYPE2;
      pfkey_x_satype->sadb_x_satype_satype = satype;
      for (i=0; i<3; i++) {
            pfkey_x_satype->sadb_x_satype_reserved[i] = 0;
      }

errlab:
      return error;
}

int
pfkey_x_debug_build(struct sadb_ext**     pfkey_ext,
                uint32_t            tunnel,
                uint32_t            netlink,
                uint32_t            xform,
                uint32_t            eroute,
                uint32_t            spi,
                uint32_t            radij,
                uint32_t            esp,
                uint32_t            ah,
                uint32_t            rcv,
                uint32_t            pfkey,
                uint32_t            ipcomp,
                uint32_t            verbose)
{
      int error = 0;
      int i;
      struct sadb_x_debug *pfkey_x_debug = (struct sadb_x_debug *)*pfkey_ext;

      DEBUGGING(
            "pfkey_x_debug_build:\n");
      /* sanity checks... */
      if (pfkey_x_debug) {
            DEBUGGING(
                  "pfkey_x_debug_build: "
                  "why is pfkey_x_debug already pointing to something?\n");
            SENDERR(EINVAL);
      }
      
      DEBUGGING(
            "pfkey_x_debug_build: "
            "tunnel=%x netlink=%x xform=%x eroute=%x spi=%x radij=%x esp=%x ah=%x rcv=%x pfkey=%x ipcomp=%x verbose=%x?\n",
            tunnel, netlink, xform, eroute, spi, radij, esp, ah, rcv, pfkey, ipcomp, verbose);

      pfkey_x_debug = (struct sadb_x_debug*)
            MALLOC(sizeof(struct sadb_x_debug));
      *pfkey_ext = (struct sadb_ext*)pfkey_x_debug;

      if (pfkey_x_debug == NULL) {
            DEBUGGING(
                  "pfkey_x_debug_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
#if 0
      memset(pfkey_x_debug,
             0,
             sizeof(struct sadb_x_debug));
#endif
      
        pfkey_x_debug->sadb_x_debug_len = sizeof(struct sadb_x_debug) / IPSEC_PFKEYv2_ALIGN;
      pfkey_x_debug->sadb_x_debug_exttype = SADB_X_EXT_DEBUG;

      pfkey_x_debug->sadb_x_debug_tunnel = tunnel;
      pfkey_x_debug->sadb_x_debug_netlink = netlink;
      pfkey_x_debug->sadb_x_debug_xform = xform;
      pfkey_x_debug->sadb_x_debug_eroute = eroute;
      pfkey_x_debug->sadb_x_debug_spi = spi;
      pfkey_x_debug->sadb_x_debug_radij = radij;
      pfkey_x_debug->sadb_x_debug_esp = esp;
      pfkey_x_debug->sadb_x_debug_ah = ah;
      pfkey_x_debug->sadb_x_debug_rcv = rcv;
      pfkey_x_debug->sadb_x_debug_pfkey = pfkey;
      pfkey_x_debug->sadb_x_debug_ipcomp = ipcomp;
      pfkey_x_debug->sadb_x_debug_verbose = verbose;

      for (i=0; i<4; i++) {
            pfkey_x_debug->sadb_x_debug_reserved[i] = 0;
      }

errlab:
      return error;
}

#ifdef NAT_TRAVERSAL
int
pfkey_x_nat_t_type_build(struct sadb_ext**      pfkey_ext,
                uint8_t         type)
{
      int error = 0;
      int i;
      struct sadb_x_nat_t_type *pfkey_x_nat_t_type = (struct sadb_x_nat_t_type *)*pfkey_ext;

      DEBUGGING(
            "pfkey_x_nat_t_type_build:\n");
      /* sanity checks... */
      if (pfkey_x_nat_t_type) {
            DEBUGGING(
                  "pfkey_x_nat_t_type_build: "
                  "why is pfkey_x_nat_t_type already pointing to something?\n");
            SENDERR(EINVAL);
      }
      
      DEBUGGING(
            "pfkey_x_nat_t_type_build: "
            "type=%d\n", type);

      pfkey_x_nat_t_type = (struct sadb_x_nat_t_type*)
            MALLOC(sizeof(struct sadb_x_nat_t_type));

      *pfkey_ext = (struct sadb_ext*)pfkey_x_nat_t_type;
      if (pfkey_x_nat_t_type == NULL) {
            DEBUGGING(
                  "pfkey_x_nat_t_type_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      
      pfkey_x_nat_t_type->sadb_x_nat_t_type_len = sizeof(struct sadb_x_nat_t_type) / IPSEC_PFKEYv2_ALIGN;
      pfkey_x_nat_t_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
      pfkey_x_nat_t_type->sadb_x_nat_t_type_type = type;
      for (i=0; i<3; i++) {
            pfkey_x_nat_t_type->sadb_x_nat_t_type_reserved[i] = 0;
      }

errlab:
      return error;
}
int
pfkey_x_nat_t_port_build(struct sadb_ext**      pfkey_ext,
                uint16_t         exttype,
                uint16_t         port)
{
      int error = 0;
      struct sadb_x_nat_t_port *pfkey_x_nat_t_port = (struct sadb_x_nat_t_port *)*pfkey_ext;

      DEBUGGING(
            "pfkey_x_nat_t_port_build:\n");
      /* sanity checks... */
      if (pfkey_x_nat_t_port) {
            DEBUGGING(
                  "pfkey_x_nat_t_port_build: "
                  "why is pfkey_x_nat_t_port already pointing to something?\n");
            SENDERR(EINVAL);
      }
      
      switch (exttype) {      
      case SADB_X_EXT_NAT_T_SPORT:
      case SADB_X_EXT_NAT_T_DPORT:
            break;
      default:
            DEBUGGING( 
                  "pfkey_nat_t_port_build: "
                  "unrecognised ext_type=%d.\n", 
                  exttype); 
            SENDERR(EINVAL); 
      }

      DEBUGGING(
            "pfkey_x_nat_t_port_build: "
            "ext=%d, port=%d\n", exttype, port);

      pfkey_x_nat_t_port = (struct sadb_x_nat_t_port*)
            MALLOC(sizeof(struct sadb_x_nat_t_port));
      *pfkey_ext = (struct sadb_ext*)pfkey_x_nat_t_port;

      if (pfkey_x_nat_t_port == NULL) {
            DEBUGGING(
                  "pfkey_x_nat_t_port_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      
      pfkey_x_nat_t_port->sadb_x_nat_t_port_len = sizeof(struct sadb_x_nat_t_port) / IPSEC_PFKEYv2_ALIGN;
      pfkey_x_nat_t_port->sadb_x_nat_t_port_exttype = exttype;
      pfkey_x_nat_t_port->sadb_x_nat_t_port_port = port;
      pfkey_x_nat_t_port->sadb_x_nat_t_port_reserved = 0;

errlab:
      return error;
}
#endif

int pfkey_x_protocol_build(struct sadb_ext **pfkey_ext,
                     uint8_t protocol)
{
      int error = 0;
      struct sadb_protocol * p = (struct sadb_protocol *)*pfkey_ext;
      DEBUGGING("pfkey_x_protocol_build: protocol=%u\n", protocol);
      /* sanity checks... */
      if  (p != 0) {
            DEBUGGING("pfkey_x_protocol_build: bogus protocol pointer\n");
            SENDERR(EINVAL);
      }
      if ((p = (struct sadb_protocol*)MALLOC(sizeof(*p))) == 0) {
            DEBUGGING("pfkey_build: memory allocation failed\n");
            SENDERR(ENOMEM);
      }
      *pfkey_ext = (struct sadb_ext *)p;
      p->sadb_protocol_len = sizeof(*p) / sizeof(uint64_t);
      p->sadb_protocol_exttype = SADB_X_EXT_PROTOCOL;
      p->sadb_protocol_proto = protocol;
      p->sadb_protocol_flags = 0;
      p->sadb_protocol_reserved2 = 0;
 errlab:
      return error;
}


#if I_DONT_THINK_THIS_WILL_BE_USEFUL
int (*ext_default_builders[SADB_EXT_MAX +1])(struct sadb_msg*, struct sadb_ext*)
 =
{
      NULL, /* pfkey_msg_build, */
      pfkey_sa_build,
      pfkey_lifetime_build,
      pfkey_lifetime_build,
      pfkey_lifetime_build,
      pfkey_address_build,
      pfkey_address_build,
      pfkey_address_build,
      pfkey_key_build,
      pfkey_key_build,
      pfkey_ident_build,
      pfkey_ident_build,
      pfkey_sens_build,
      pfkey_prop_build,
      pfkey_supported_build,
      pfkey_supported_build,
      pfkey_spirange_build,
      pfkey_x_kmprivate_build,
      pfkey_x_satype_build,
      pfkey_sa_build,
      pfkey_address_build,
      pfkey_address_build,
      pfkey_address_build,
      pfkey_address_build,
      pfkey_address_build,
      pfkey_x_ext_debug_build
};
#endif

int
pfkey_msg_build(struct sadb_msg **pfkey_msg, struct sadb_ext *extensions[], int dir)
{
      int error = 0;
      unsigned ext;
      unsigned total_size;
      struct sadb_ext *pfkey_ext;
      int extensions_seen = 0;
      struct sadb_ext *extensions_check[SADB_EXT_MAX + 1];
      
      if (!extensions[0]) {
            DEBUGGING(
                  "pfkey_msg_build: "
                  "extensions[0] must be specified (struct sadb_msg).\n");
            SENDERR(EINVAL);
      }

      total_size = sizeof(struct sadb_msg) / IPSEC_PFKEYv2_ALIGN;
      for (ext = 1; ext <= SADB_EXT_MAX; ext++) {
            if(extensions[ext]) {
                  total_size += (extensions[ext])->sadb_ext_len;
            }
        }                

      if (!(*pfkey_msg = (struct sadb_msg*)MALLOC(total_size * IPSEC_PFKEYv2_ALIGN))) {
            DEBUGGING(
                  "pfkey_msg_build: "
                  "memory allocation failed\n");
            SENDERR(ENOMEM);
      }

      DEBUGGING(
            "pfkey_msg_build: "
            "pfkey_msg=0p%p allocated %lu bytes, &(extensions[0])=0p%p\n",
            *pfkey_msg,
            (unsigned long)(total_size * IPSEC_PFKEYv2_ALIGN),
            &(extensions[0]));
      memcpy(*pfkey_msg,
             extensions[0],
             sizeof(struct sadb_msg));
      (*pfkey_msg)->sadb_msg_len = total_size;
      (*pfkey_msg)->sadb_msg_reserved = 0;
      extensions_seen =  1 ;

      pfkey_ext = (struct sadb_ext*)(((char*)(*pfkey_msg)) + sizeof(struct sadb_msg));

      for (ext = 1; ext <= SADB_EXT_MAX; ext++) {
            /* copy from extension[ext] to buffer */
            if (extensions[ext]) {    
                  /* Is this type of extension permitted for this type of message? */
                  if (!(extensions_bitmaps[dir][EXT_BITS_PERM][(*pfkey_msg)->sadb_msg_type] &
                       1<<ext)) {
                        DEBUGGING(
                              "pfkey_msg_build: "
                              "ext type %d not permitted, exts_perm=%08x, 1<<type=%08x\n", 
                              ext, 
                              extensions_bitmaps[dir][EXT_BITS_PERM][(*pfkey_msg)->sadb_msg_type],
                              1<<ext);
                        SENDERR(EINVAL);
                  }
                  DEBUGGING(
                        "pfkey_msg_build: "
                        "copying %lu bytes from extensions[%u]=0p%p to=0p%p\n",
                        (unsigned long)(extensions[ext]->sadb_ext_len * IPSEC_PFKEYv2_ALIGN),
                        ext,
                        extensions[ext],
                        pfkey_ext);
                  memcpy(pfkey_ext,
                         extensions[ext],
                         (extensions[ext])->sadb_ext_len * IPSEC_PFKEYv2_ALIGN);
                  {      
                        char *pfkey_ext_c = (char *)pfkey_ext;

                        pfkey_ext_c += (extensions[ext])->sadb_ext_len * IPSEC_PFKEYv2_ALIGN;
                        pfkey_ext = (struct sadb_ext *)pfkey_ext_c;
                  }
                  /* Mark that we have seen this extension and remember the header location */
                  extensions_seen |= ( 1 << ext );
            }
      }

      /* check required extensions */
      DEBUGGING(
            "pfkey_msg_build: "
            "extensions permitted=%08x, seen=%08x, required=%08x.\n",
            extensions_bitmaps[dir][EXT_BITS_PERM][(*pfkey_msg)->sadb_msg_type],
            extensions_seen,
            extensions_bitmaps[dir][EXT_BITS_REQ][(*pfkey_msg)->sadb_msg_type]);
      
      if ((extensions_seen &
          extensions_bitmaps[dir][EXT_BITS_REQ][(*pfkey_msg)->sadb_msg_type]) !=
          extensions_bitmaps[dir][EXT_BITS_REQ][(*pfkey_msg)->sadb_msg_type]) {
            DEBUGGING(
                  "pfkey_msg_build: "
                  "required extensions missing:%08x.\n",
                  extensions_bitmaps[dir][EXT_BITS_REQ][(*pfkey_msg)->sadb_msg_type] -
                  (extensions_seen &
                   extensions_bitmaps[dir][EXT_BITS_REQ][(*pfkey_msg)->sadb_msg_type]) );
            SENDERR(EINVAL);
      }
      
      error = pfkey_msg_parse(*pfkey_msg, NULL, extensions_check, dir);
      if (error) {
            DEBUGGING(
                  "pfkey_msg_build: "
                  "Trouble parsing newly built pfkey message, error=%d.\n",
                  error);
            SENDERR(-error);
      }

errlab:

      return error;
}

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