path: root/sbin/isakmpd/pf_key_v2.c

/*      $OpenBSD: pf_key_v2.c,v 1.92 2002/01/03 09:19:52 ho Exp $  */
/*	$EOM: pf_key_v2.c,v 1.79 2000/12/12 00:33:19 niklas Exp $	*/

/*
 * Copyright (c) 1999, 2000, 2001 Niklas Hallqvist.  All rights reserved.
 * Copyright (c) 1999, 2000, 2001 Angelos D. Keromytis.  All rights reserved.
 * Copyright (c) 2001 Håkan Olsson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Ericsson Radio Systems.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <net/pfkeyv2.h>
#include <netinet/in.h>
#ifdef SADB_X_EXT_FLOW_TYPE
#include <sys/mbuf.h>
#include <netinet/ip_ipsp.h>
#endif
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <errno.h>
#include <bitstring.h>

#include "sysdep.h"

#include "cert.h"
#include "conf.h"
#include "exchange.h"
#include "ipsec.h"
#include "ipsec_num.h"
#include "key.h"
#include "log.h"
#include "pf_key_v2.h"
#include "sa.h"
#include "timer.h"
#include "transport.h"
#include "util.h"

#ifdef USE_KEYNOTE
#include "policy.h"
#endif

#define IN6_IS_ADDR_FULL(a)						\
  ((*(u_int32_t *)(void *)(&(a)->s6_addr[0]) == 0xffff)			\
   && (*(u_int32_t *)(void *)(&(a)->s6_addr[4]) == 0xffff)		\
   && (*(u_int32_t *)(void *)(&(a)->s6_addr[8]) == 0xffff)		\
   && (*(u_int32_t *)(void *)(&(a)->s6_addr[12]) == 0xffff))

#define ADDRESS_MAX sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"

/*
 * PF_KEY v2 always work with 64-bit entities and aligns on 64-bit boundaries.
 */
#define PF_KEY_V2_CHUNK 8
#define PF_KEY_V2_ROUND(x)						\
  (((x) + PF_KEY_V2_CHUNK - 1) & ~(PF_KEY_V2_CHUNK - 1))

/* How many microseconds we will wait for a reply from the PF_KEY socket.  */
#define PF_KEY_REPLY_TIMEOUT 1000

struct pf_key_v2_node {
  TAILQ_ENTRY (pf_key_v2_node) link;
  void *seg;
  size_t sz;
  int cnt;
  u_int16_t type;
  u_int8_t flags;
};

TAILQ_HEAD (pf_key_v2_msg, pf_key_v2_node);

#define PF_KEY_V2_NODE_MALLOCED 1
#define PF_KEY_V2_NODE_MARK 2

/* Used to derive "unique" connection identifiers. */
int connection_seq = 0;

#ifdef KAME
/*
 * KAME requires the sadb_msg_seq of an UPDATE be the same of that of the
 * GETSPI creating the larval SA.
 */
struct pf_key_v2_sa_seq {
  TAILQ_ENTRY (pf_key_v2_sa_seq) link;
  u_int8_t *spi;
  size_t sz;
  u_int8_t proto;
  struct sockaddr *dst;
  int dstlen;
  u_int32_t seq;
};

TAILQ_HEAD (, pf_key_v2_sa_seq) pf_key_v2_sa_seq_map;
#endif

#ifndef KAME
static u_int8_t *pf_key_v2_convert_id (u_int8_t *, int, size_t *, int *);
#endif
static struct pf_key_v2_msg *pf_key_v2_call (struct pf_key_v2_msg *);
static struct pf_key_v2_node *pf_key_v2_find_ext (struct pf_key_v2_msg *,
						  u_int16_t);
static void pf_key_v2_notify (struct pf_key_v2_msg *);
static struct pf_key_v2_msg *pf_key_v2_read (u_int32_t);
static u_int32_t pf_key_v2_seq (void);
static u_int32_t pf_key_v2_write (struct pf_key_v2_msg *);
static int pf_key_v2_remove_conf (char *);
static int pf_key_v2_conf_refhandle (int, char *);
#ifdef SADB_X_ASKPOLICY
static int pf_key_v2_conf_refinc (int, char *);
#endif

/* The socket to use for PF_KEY interactions.  */
static int pf_key_v2_socket;

#ifdef KAME
static int
pf_key_v2_register_sa_seq (u_int8_t *spi, size_t sz, u_int8_t proto,
			   struct sockaddr *dst, int dstlen, u_int32_t seq)
{
  struct pf_key_v2_sa_seq *node = 0;

  node = malloc (sizeof *node);
  if (!node)
    goto cleanup;
  memset (node, '0', sizeof *node);
  node->spi = malloc (sz);
  if (!node->spi)
    goto cleanup;
  node->dst = malloc (sysdep_sa_len (dst));
  if (!node->spi)
    goto cleanup;
  memcpy (node->dst, dst, sysdep_sa_len (dst));
  node->dstlen = sysdep_sa_len (dst);
  memcpy (node->spi, spi, sz);
  node->sz = sz;
  node->proto = proto;
  node->seq = seq;
  TAILQ_INSERT_TAIL (&pf_key_v2_sa_seq_map, node, link);
  return 1;

 cleanup:
  if (node->dst)
    free (node->dst);
  if (node)
    free (node);
  return 0;
}

static u_int32_t
pf_key_v2_seq_by_sa (u_int8_t *spi, size_t sz, u_int8_t proto,
		     struct sockaddr *dst, int dstlen)
{
  struct pf_key_v2_sa_seq *node;

  for (node = TAILQ_FIRST (&pf_key_v2_sa_seq_map); node;
       node = TAILQ_NEXT (node, link))
    if (node->proto == proto
	&& node->sz == sz && memcmp (node->spi, spi, sz) == 0
	&& node->dstlen == sysdep_sa_len (dst)
	&& memcmp (node->dst, dst, sysdep_sa_len (dst)) == 0)
      return node->seq;
  return 0;
}
#endif

static struct pf_key_v2_msg *
pf_key_v2_msg_new (struct sadb_msg *msg, int flags)
{
  struct pf_key_v2_node *node = 0;
  struct pf_key_v2_msg *ret;

  node = malloc (sizeof *node);
  if (!node)
    goto cleanup;
  ret = malloc (sizeof *ret);
  if (!ret)
    goto cleanup;
  TAILQ_INIT (ret);
  node->seg = msg;
  node->sz = sizeof *msg;
  node->type = 0;
  node->cnt = 1;
  node->flags = flags;
  TAILQ_INSERT_HEAD (ret, node, link);
  return ret;

 cleanup:
  if (node)
    free (node);
  return 0;
}

/* Add a SZ sized segment SEG to the PF_KEY message MSG.  */
static int
pf_key_v2_msg_add (struct pf_key_v2_msg *msg, struct sadb_ext *ext, int flags)
{
  struct pf_key_v2_node *node;

  node = malloc (sizeof *node);
  if (!node)
    return -1;
  node->seg = ext;
  node->sz = ext->sadb_ext_len * PF_KEY_V2_CHUNK;
  node->type = ext->sadb_ext_type;
  node->flags = flags;
  TAILQ_FIRST (msg)->cnt++;
  TAILQ_INSERT_TAIL (msg, node, link);
  return 0;
}

/* Deallocate the PF_KEY message MSG.  */
static void
pf_key_v2_msg_free (struct pf_key_v2_msg *msg)
{
  struct pf_key_v2_node *np;

  np = TAILQ_FIRST (msg);
  while (np)
    {
      TAILQ_REMOVE (msg, np, link);
      if (np->flags & PF_KEY_V2_NODE_MALLOCED)
	free (np->seg);
      free (np);
      np = TAILQ_FIRST (msg);
    }
  free (msg);
}

/* Just return a new sequence number.  */
static u_int32_t
pf_key_v2_seq (void)
{
  static u_int32_t seq = 0;

  return ++seq;
}

/*
 * Read a PF_KEY packet with SEQ as the sequence number, looping if necessary.
 * If SEQ is zero just read the first message we see, otherwise we queue
 * messages up until both the PID and the sequence number match.
 */
static struct pf_key_v2_msg *
pf_key_v2_read (u_int32_t seq)
{
  ssize_t n;
  u_int8_t *buf = 0;
  struct pf_key_v2_msg *ret = 0;
  struct sadb_msg *msg;
  struct sadb_msg hdr;
  struct sadb_ext *ext;
  struct timeval tv;
  fd_set *fds;

  while (1)
    {
      /*
       * If this is a read of a reply we should actually expect the reply to
       * get lost as PF_KEY is an unreliable service per the specs.
       * Currently we do this by setting a short timeout, and if it is not
       * readable in that time, we fail the read.
       */
      if (seq)
	{
	  fds = calloc (howmany (pf_key_v2_socket + 1, NFDBITS),
			sizeof (fd_mask));
	  if (!fds)
	    {
	      log_error ("pf_key_v2_read: calloc (%d, %d) failed",
			 howmany (pf_key_v2_socket + 1, NFDBITS),
			 sizeof (fd_mask));
	      goto cleanup;
	    }
	  FD_SET (pf_key_v2_socket, fds);
	  tv.tv_sec = 0;
	  tv.tv_usec = PF_KEY_REPLY_TIMEOUT;
	  n = select (pf_key_v2_socket + 1, fds, 0, 0, &tv);
	  free (fds);
	  if (n == -1)
	    {
	      log_error ("pf_key_v2_read: select (%d, fds, 0, 0, &tv) failed",
			 pf_key_v2_socket + 1);
	      goto cleanup;
	    }
	  if (!n)
	    {
	      log_print ("pf_key_v2_read: no reply from PF_KEY");
	      goto cleanup;
	    }
	}
      n = recv (pf_key_v2_socket, &hdr, sizeof hdr, MSG_PEEK);
      if (n == -1)
	{
	  log_error ("pf_key_v2_read: recv (%d, ...) failed",
		     pf_key_v2_socket);
	  goto cleanup;
	}
      if (n != sizeof hdr)
	{
	  log_error ("pf_key_v2_read: recv (%d, ...) returned short packet "
		     "(%d bytes)",
		     pf_key_v2_socket, n);
	  goto cleanup;
	}

      n = hdr.sadb_msg_len * PF_KEY_V2_CHUNK;
      buf = malloc (n);
      if (!buf)
	{
	  log_error ("pf_key_v2_read: malloc (%d) failed", n);
	  goto cleanup;
	}

      n = read (pf_key_v2_socket, buf, n);
      if (n == -1)
	{
	  log_error ("pf_key_v2_read: read (%d, ...) failed",
		     pf_key_v2_socket);
	  goto cleanup;
	}

      if ((size_t)n != hdr.sadb_msg_len * PF_KEY_V2_CHUNK)
	{
	  log_print ("pf_key_v2_read: read (%d, ...) returned short packet "
		     "(%d bytes)",
		     pf_key_v2_socket, n);
	  goto cleanup;
	}

      LOG_DBG_BUF ((LOG_SYSDEP, 80, "pf_key_v2_read: msg", buf, n));

      /* We drop all messages that is not what we expect.  */
      msg = (struct sadb_msg *)buf;
      if (msg->sadb_msg_version != PF_KEY_V2
	  || (msg->sadb_msg_pid != 0 && msg->sadb_msg_pid != getpid ()))
	{
	  if (seq)
	    {
	      free (buf);
	      buf = 0;
	      continue;
	    }
	  else
	    {
	      LOG_DBG ((LOG_SYSDEP, 90,
			"pf_key_v2_read:"
			"bad version (%d) or PID (%d, mine is %d), ignored",
			msg->sadb_msg_version, msg->sadb_msg_pid,
			getpid ()));
	      goto cleanup;
	    }
	}

      /* Parse the message.  */
      ret = pf_key_v2_msg_new (msg, PF_KEY_V2_NODE_MALLOCED);
      if (!ret)
	goto cleanup;
      buf = 0;
      for (ext = (struct sadb_ext *)(msg + 1);
	   (u_int8_t *)ext - (u_int8_t *)msg
	     < msg->sadb_msg_len * PF_KEY_V2_CHUNK;
	   ext = (struct sadb_ext *)((u_int8_t *)ext
				     + ext->sadb_ext_len * PF_KEY_V2_CHUNK))
	pf_key_v2_msg_add (ret, ext, 0);

      /* If the message is not the one we are waiting for, queue it up.  */
      if (seq && (msg->sadb_msg_pid != getpid () || msg->sadb_msg_seq != seq))
	{
	  gettimeofday (&tv, 0);
	  timer_add_event ("pf_key_v2_notify",
			   (void (*) (void *))pf_key_v2_notify, ret, &tv);
	  ret = 0;
	  continue;
	}

      return ret;
    }

 cleanup:
  if (buf)
    free (buf);
  if (ret)
    pf_key_v2_msg_free (ret);
  return 0;
}

/* Write the message in PMSG to the PF_KEY socket.  */
u_int32_t
pf_key_v2_write (struct pf_key_v2_msg *pmsg)
{
  struct iovec *iov = 0;
  ssize_t n;
  size_t len;
  int i, cnt = TAILQ_FIRST (pmsg)->cnt;
  char header[80];
  struct sadb_msg *msg = TAILQ_FIRST (pmsg)->seg;
  struct pf_key_v2_node *np = TAILQ_FIRST (pmsg);

  iov = (struct iovec *)malloc (cnt * sizeof *iov);
  if (!iov)
    {
      log_error ("pf_key_v2_write: malloc (%d) failed", cnt * sizeof *iov);
      return 0;
    }

  msg->sadb_msg_version = PF_KEY_V2;
  msg->sadb_msg_errno = 0;
  msg->sadb_msg_reserved = 0;
  msg->sadb_msg_pid = getpid ();
  if (!msg->sadb_msg_seq)
    msg->sadb_msg_seq = pf_key_v2_seq ();

  /* Compute the iovec segments as well as the message length.  */
  len = 0;
  for (i = 0; i < cnt; i++)
    {
      iov[i].iov_base = np->seg;
      len += iov[i].iov_len = np->sz;

      /*
       * XXX One can envision setting specific extension fields, like
       * *_reserved ones here.  For now we require them to be set by the
       * caller.
       */

      np = TAILQ_NEXT (np, link);
    }
  msg->sadb_msg_len = len / PF_KEY_V2_CHUNK;

  for (i = 0; i < cnt; i++)
    {
      sprintf (header, "pf_key_v2_write: iov[%d]", i);
      LOG_DBG_BUF ((LOG_SYSDEP, 80, header, (u_int8_t *)iov[i].iov_base,
		    iov[i].iov_len));
    }

  n = writev (pf_key_v2_socket, iov, cnt);
  if (n == -1)
    {
      log_error ("pf_key_v2_write: writev (%d, %p, %d) failed",
		 pf_key_v2_socket, iov, cnt);
      goto cleanup;
    }
  if ((size_t)n != len)
    {
      log_error ("pf_key_v2_write: writev (%d, ...) returned prematurely (%d)",
		 pf_key_v2_socket, n);
      goto cleanup;
    }
  free (iov);
  return msg->sadb_msg_seq;

 cleanup:
  if (iov)
    free (iov);
  return 0;
}

/*
 * Do a PF_KEY "call", i.e. write a message MSG, read the reply and return
 * it to the caller.
 */
static struct pf_key_v2_msg *
pf_key_v2_call (struct pf_key_v2_msg *msg)
{
  u_int32_t seq;

  seq = pf_key_v2_write (msg);
  if (!seq)
    return 0;
  return pf_key_v2_read (seq);
}

/* Find the TYPE extension in MSG.  Return zero if none found.  */
static struct pf_key_v2_node *
pf_key_v2_find_ext (struct pf_key_v2_msg *msg, u_int16_t type)
{
  struct pf_key_v2_node *ext;

  for (ext = TAILQ_NEXT (TAILQ_FIRST (msg), link); ext;
       ext = TAILQ_NEXT (ext, link))
    if (ext->type == type)
      return ext;
  return 0;
}

/*
 * Open the PF_KEYv2 sockets and return the descriptor used for notifies.
 * Return -1 for failure and -2 if no notifies will show up.
 */
int
pf_key_v2_open (void)
{
  int fd = -1, err;
  struct sadb_msg msg;
  struct pf_key_v2_msg *regmsg = 0, *ret = 0;

  /* Open the socket we use to speak to IPSec. */
  pf_key_v2_socket = -1;
  fd = socket (PF_KEY, SOCK_RAW, PF_KEY_V2);
  if (fd == -1)
    {
      log_error ("pf_key_v2_open: "
		 "socket (PF_KEY, SOCK_RAW, PF_KEY_V2) failed");
      goto cleanup;
    }
  pf_key_v2_socket = fd;

  /* Register it to get ESP and AH acquires from the kernel.  */
  msg.sadb_msg_seq = 0;
  msg.sadb_msg_type = SADB_REGISTER;
  msg.sadb_msg_satype = SADB_SATYPE_ESP;
  regmsg = pf_key_v2_msg_new (&msg, 0);
  if (!regmsg)
    goto cleanup;
  ret = pf_key_v2_call (regmsg);
  pf_key_v2_msg_free (regmsg);
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  if (err)
    {
      log_print ("pf_key_v2_open: REGISTER: %s", strerror (err));
      goto cleanup;
    }

  /* XXX Register the accepted transforms.  */

  pf_key_v2_msg_free (ret);
  ret = 0;

  msg.sadb_msg_seq = 0;
  msg.sadb_msg_type = SADB_REGISTER;
  msg.sadb_msg_satype = SADB_SATYPE_AH;
  regmsg = pf_key_v2_msg_new (&msg, 0);
  if (!regmsg)
    goto cleanup;
  ret = pf_key_v2_call (regmsg);
  pf_key_v2_msg_free (regmsg);
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  if (err)
    {
      log_print ("pf_key_v2_open: REGISTER: %s", strerror (err));
      goto cleanup;
    }

  /* XXX Register the accepted transforms.  */

  pf_key_v2_msg_free (ret);
  ret = 0;

#ifdef SADB_X_SATYPE_IPCOMP
  msg.sadb_msg_seq = 0;
  msg.sadb_msg_type = SADB_REGISTER;
  msg.sadb_msg_satype = SADB_X_SATYPE_IPCOMP;
  regmsg = pf_key_v2_msg_new (&msg, 0);
  if (!regmsg)
    goto cleanup;
  ret = pf_key_v2_call (regmsg);
  pf_key_v2_msg_free (regmsg);
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  if (err)
    {
      log_print ("pf_key_v2_open: REGISTER: %s", strerror (err));
      goto cleanup;
    }

  /* XXX Register the accepted transforms.  */

  pf_key_v2_msg_free (ret);
#endif /* SADB_X_SATYPE_IPCOMP */

#ifdef KAME
  TAILQ_INIT (&pf_key_v2_sa_seq_map);
#endif

  return fd;

 cleanup:
  if (pf_key_v2_socket != -1)
    {
      close (pf_key_v2_socket);
      pf_key_v2_socket = -1;
    }
  if (ret)
    pf_key_v2_msg_free (ret);
  return -1;
}

/*
 * Generate a SPI for protocol PROTO and the source/destination pair given by
 * SRC, SRCLEN, DST & DSTLEN.  Stash the SPI size in SZ.
 */
u_int8_t *
pf_key_v2_get_spi (size_t *sz, u_int8_t proto, struct sockaddr *src,
		   struct sockaddr *dst, u_int32_t seq)
{
  struct sadb_msg msg;
  struct sadb_sa *sa;
  struct sadb_address *addr = 0;
  struct sadb_spirange spirange;
  struct pf_key_v2_msg *getspi = 0, *ret = 0;
  struct pf_key_v2_node *ext;
  u_int8_t *spi = 0;
  int len, err;
#ifdef KAME
  struct sadb_x_sa2 ssa2;
#endif

  msg.sadb_msg_type = SADB_GETSPI;
  switch (proto)
    {
    case IPSEC_PROTO_IPSEC_ESP:
      msg.sadb_msg_satype = SADB_SATYPE_ESP;
      break;
    case IPSEC_PROTO_IPSEC_AH:
      msg.sadb_msg_satype = SADB_SATYPE_AH;
      break;
#ifdef SADB_X_SATYPE_IPCOMP
    case IPSEC_PROTO_IPCOMP:
      msg.sadb_msg_satype = SADB_X_SATYPE_IPCOMP;
      break;
#endif
    default:
      log_print ("pf_key_v2_get_spi: invalid proto %d", proto);
      goto cleanup;
    }

  /* Set the sequence number from the ACQUIRE message. */
  msg.sadb_msg_seq = seq;
  getspi = pf_key_v2_msg_new (&msg, 0);
  if (!getspi)
    goto cleanup;

#ifdef KAME
  memset (&ssa2, 0, sizeof ssa2);
  ssa2.sadb_x_sa2_exttype = SADB_X_EXT_SA2;
  ssa2.sadb_x_sa2_len = sizeof ssa2 / PF_KEY_V2_CHUNK;
  ssa2.sadb_x_sa2_mode = 0;
  if (pf_key_v2_msg_add (getspi, (struct sadb_ext *)&ssa2, 0) == -1)
    goto cleanup;
#endif

  /* Setup the ADDRESS extensions.  */
  len = sizeof (struct sadb_address) + PF_KEY_V2_ROUND (sysdep_sa_len (src));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
  addr->sadb_address_proto = 0;
  addr->sadb_address_prefixlen = 0;
#endif
  addr->sadb_address_reserved = 0;
  memcpy (addr + 1, src, sysdep_sa_len (src));
  switch (((struct sockaddr *)(addr + 1))->sa_family)
    {
    case AF_INET:
      ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)(addr + 1))->sin6_port = 0;
      break;
    }
  if (pf_key_v2_msg_add (getspi, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  len = sizeof (struct sadb_address) + PF_KEY_V2_ROUND (sysdep_sa_len (dst));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
  addr->sadb_address_proto = 0;
  addr->sadb_address_prefixlen = 0;
#endif
  addr->sadb_address_reserved = 0;
  memcpy (addr + 1, dst, sysdep_sa_len (dst));
  switch (((struct sockaddr *)(addr + 1))->sa_family)
    {
    case AF_INET:
      ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)(addr + 1))->sin6_port = 0;
      break;
    }
  if (pf_key_v2_msg_add (getspi, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  /* Setup the SPIRANGE extension.  */
  spirange.sadb_spirange_exttype = SADB_EXT_SPIRANGE;
  spirange.sadb_spirange_len = sizeof spirange / PF_KEY_V2_CHUNK;
  spirange.sadb_spirange_min = IPSEC_SPI_LOW;
  spirange.sadb_spirange_max = 0xffffffff;
  spirange.sadb_spirange_reserved = 0;
  if (pf_key_v2_msg_add (getspi, (struct sadb_ext *)&spirange, 0) == -1)
    goto cleanup;

  ret = pf_key_v2_call (getspi);
  pf_key_v2_msg_free (getspi);
  getspi = 0;
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  if (err)
    {
      log_print ("pf_key_v2_get_spi: GETSPI: %s", strerror (err));
      goto cleanup;
    }

  ext = pf_key_v2_find_ext (ret, SADB_EXT_SA);
  if (!ext)
    {
      log_print ("pf_key_v2_get_spi: no SA extension found");
      goto cleanup;
    }
  sa = ext->seg;

  /* IPCOMP CPIs are only 16 bits long.  */
  *sz = (proto == IPSEC_PROTO_IPCOMP) ? sizeof (u_int16_t)
    : sizeof sa->sadb_sa_spi;
  spi = malloc (*sz);
  if (!spi)
    goto cleanup;
  /* XXX This is ugly.  */
  if (proto == IPSEC_PROTO_IPCOMP)
    *(u_int16_t *)spi = (u_int16_t)sa->sadb_sa_spi;
  else
    memcpy (spi, &sa->sadb_sa_spi, *sz);

#ifdef KAME
  if (!pf_key_v2_register_sa_seq (spi, *sz, proto, dst, sysdep_sa_len (dst),
				  ((struct sadb_msg *)(TAILQ_FIRST (ret)->seg))
				  ->sadb_msg_seq))
    goto cleanup;
#endif
  pf_key_v2_msg_free (ret);

  LOG_DBG_BUF ((LOG_SYSDEP, 50, "pf_key_v2_get_spi: spi", spi, *sz));

  return spi;

 cleanup:
  if (spi)
    free (spi);
  if (addr)
    free (addr);
  if (getspi)
    pf_key_v2_msg_free (getspi);
  if (ret)
    pf_key_v2_msg_free (ret);
  return 0;
}

/*
 * Store/update a PF_KEY_V2 security association with full information from the
 * IKE SA and PROTO into the kernel.  INCOMING is set if we are setting the
 * parameters for the incoming SA, and cleared otherwise.
 */
int
pf_key_v2_set_spi (struct sa *sa, struct proto *proto, int incoming,
		   struct sa *isakmp_sa)
{
  struct sadb_msg msg;
  struct sadb_sa ssa;
  struct sadb_lifetime *life = 0;
  struct sadb_address *addr = 0;
  struct sadb_key *key = 0;
  struct sockaddr *src, *dst;
  struct sadb_ident *sid = 0;
#ifndef KAME
  char *pp;
  int idtype;
#endif
  int keylen, hashlen, err;
  struct pf_key_v2_msg *update = 0, *ret = 0;
  struct ipsec_proto *iproto = proto->data;
#if defined (SADB_X_CREDTYPE_NONE) || defined (SADB_X_AUTHTYPE_NONE)
  struct sadb_x_cred *cred;
#endif
  size_t len;
#ifdef KAME
  struct sadb_x_sa2 ssa2;
#endif
#ifdef USE_DEBUG
  char *addr_str;
#endif

  msg.sadb_msg_type = incoming ? SADB_UPDATE : SADB_ADD;
  switch (proto->proto)
    {
    case IPSEC_PROTO_IPSEC_ESP:
      msg.sadb_msg_satype = SADB_SATYPE_ESP;
      keylen = ipsec_esp_enckeylength (proto);
      hashlen = ipsec_esp_authkeylength (proto);

      switch (proto->id)
	{
	case IPSEC_ESP_DES:
	case IPSEC_ESP_DES_IV32:
	case IPSEC_ESP_DES_IV64:
	  ssa.sadb_sa_encrypt = SADB_EALG_DESCBC;
	  break;

	case IPSEC_ESP_3DES:
	  ssa.sadb_sa_encrypt = SADB_EALG_3DESCBC;
	  break;

#ifdef SADB_X_EALG_AES
	case IPSEC_ESP_AES:
	  ssa.sadb_sa_encrypt = SADB_X_EALG_AES;
	  break;
#endif

#ifdef SADB_X_EALG_CAST
	case IPSEC_ESP_CAST:
	  ssa.sadb_sa_encrypt = SADB_X_EALG_CAST;
	  break;
#endif

#ifdef SADB_X_EALG_BLF
	case IPSEC_ESP_BLOWFISH:
	  ssa.sadb_sa_encrypt = SADB_X_EALG_BLF;
	  break;
#endif

	default:
	  LOG_DBG ((LOG_SYSDEP, 50,
		    "pf_key_v2_set_spi: unknown encryption algorithm %d",
		    proto->id));
	  return -1;
	}

      switch (iproto->auth)
	{
	case IPSEC_AUTH_HMAC_MD5:
#ifdef SADB_AALG_MD5HMAC96
	  ssa.sadb_sa_auth = SADB_AALG_MD5HMAC96;
#else
	  ssa.sadb_sa_auth = SADB_AALG_MD5HMAC;
#endif
	  break;

	case IPSEC_AUTH_HMAC_SHA:
#ifdef SADB_AALG_SHA1HMAC96
	  ssa.sadb_sa_auth = SADB_AALG_SHA1HMAC96;
#else
	  ssa.sadb_sa_auth = SADB_AALG_SHA1HMAC;
#endif
	  break;

#ifndef KAME
        case IPSEC_AUTH_HMAC_RIPEMD:
#ifdef SADB_X_AALG_RIPEMD160HMAC96
	  ssa.sadb_sa_auth = SADB_X_AALG_RIPEMD160HMAC96;
#else
	  ssa.sadb_sa_auth = SADB_AALG_RIPEMD160HMAC;
#endif
	  break;
#endif

	case IPSEC_AUTH_DES_MAC:
	case IPSEC_AUTH_KPDK:
	  /* XXX We should be supporting KPDK */
	  LOG_DBG ((LOG_SYSDEP, 50,
		    "pf_key_v2_set_spi: unknown authentication algorithm %d",
		    iproto->auth));
	  return -1;

	default:
	  ssa.sadb_sa_auth = SADB_AALG_NONE;
	}
      break;

    case IPSEC_PROTO_IPSEC_AH:
      msg.sadb_msg_satype = SADB_SATYPE_AH;
      hashlen = ipsec_ah_keylength (proto);
      keylen = 0;

      ssa.sadb_sa_encrypt = SADB_EALG_NONE;
      switch (proto->id)
	{
	case IPSEC_AH_MD5:
#ifdef SADB_AALG_MD5HMAC96
	  ssa.sadb_sa_auth = SADB_AALG_MD5HMAC96;
#else
	  ssa.sadb_sa_auth = SADB_AALG_MD5HMAC;
#endif
	  break;

	case IPSEC_AH_SHA:
#ifdef SADB_AALG_SHA1HMAC96
	  ssa.sadb_sa_auth = SADB_AALG_SHA1HMAC96;
#else
	  ssa.sadb_sa_auth = SADB_AALG_SHA1HMAC;
#endif
	  break;

#ifndef KAME
	case IPSEC_AH_RIPEMD:
#ifdef SADB_X_AALG_RIPEMD160HMAC96
	  ssa.sadb_sa_auth = SADB_X_AALG_RIPEMD160HMAC96;
#else
	  ssa.sadb_sa_auth = SADB_AALG_RIPEMD160HMAC;
#endif
	  break;
#endif

	default:
	  LOG_DBG ((LOG_SYSDEP, 50,
		    "pf_key_v2_set_spi: unknown authentication algorithm %d",
		    proto->id));
	  goto cleanup;
	}
      break;

#ifdef SADB_X_SATYPE_IPCOMP
    case IPSEC_PROTO_IPCOMP:
      msg.sadb_msg_satype = SADB_X_SATYPE_IPCOMP;
      ssa.sadb_sa_auth = SADB_AALG_NONE;
      keylen = 0;
      hashlen = 0;

      /* Put compression algorithm type in the sadb_sa_encrypt field.  */
      switch (proto->id)
	{
#ifdef SADB_X_CALG_OUI
	case IPSEC_IPCOMP_OUI:
	  ssa.sadb_sa_encrypt = SADB_X_CALG_OUI;
	  break;
#endif

#ifdef SADB_X_CALG_DEFLATE
	case IPSEC_IPCOMP_DEFLATE:
	  ssa.sadb_sa_encrypt = SADB_X_CALG_DEFLATE;
	  break;
#endif

#ifdef SADB_X_CALG_LSZ
	case IPSEC_IPCOMP_LZS:
	  ssa.sadb_sa_encrypt = SADB_X_CALG_LSZ;
	  break;
#endif

#ifdef SADB_X_CALG_V42BIS
	case IPSEC_IPCOMP_V42BIS:
	  ssa.sadb_sa_encrypt = SADB_X_CALG_V42BIS;
	  break;
#endif

	default:
	  break;
	}
      break;
#endif /* SADB_X_SATYPE_IPCOMP */

    default:
      log_print ("pf_key_v2_set_spi: invalid proto %d", proto->proto);
      goto cleanup;
    }
  if (incoming)
    sa->transport->vtbl->get_src (sa->transport, &dst);
  else
    sa->transport->vtbl->get_dst (sa->transport, &dst);
#ifdef KAME
  msg.sadb_msg_seq
    = (incoming ? pf_key_v2_seq_by_sa (proto->spi[incoming],
				       sizeof ssa.sadb_sa_spi, proto->proto,
				       dst, sysdep_sa_len (dst))
       : 0);
#else
  msg.sadb_msg_seq = sa->seq;
#endif
  update = pf_key_v2_msg_new (&msg, 0);
  if (!update)
    goto cleanup;

#ifdef KAME
  memset (&ssa2, 0, sizeof ssa2);
  ssa2.sadb_x_sa2_exttype = SADB_X_EXT_SA2;
  ssa2.sadb_x_sa2_len = sizeof ssa2 / PF_KEY_V2_CHUNK;
  ssa2.sadb_x_sa2_mode = 0;
  if (pf_key_v2_msg_add (update, (struct sadb_ext *)&ssa2, 0) == -1)
    goto cleanup;
#endif

  /* Setup the rest of the SA extension.  */
  ssa.sadb_sa_exttype = SADB_EXT_SA;
  ssa.sadb_sa_len = sizeof ssa / PF_KEY_V2_CHUNK;
  memcpy (&ssa.sadb_sa_spi, proto->spi[incoming], sizeof ssa.sadb_sa_spi);
  ssa.sadb_sa_replay
    = conf_get_str ("General", "Shared-SADB") ? 0 : iproto->replay_window;
  ssa.sadb_sa_state = SADB_SASTATE_MATURE;
#ifdef SADB_X_SAFLAGS_TUNNEL
  ssa.sadb_sa_flags
    = iproto->encap_mode == IPSEC_ENCAP_TUNNEL ? SADB_X_SAFLAGS_TUNNEL : 0;
#else
  ssa.sadb_sa_flags = 0;
#endif
  if (pf_key_v2_msg_add (update, (struct sadb_ext *)&ssa, 0) == -1)
    goto cleanup;

  if (sa->seconds || sa->kilobytes)
    {
      /* Setup the hard limits.  */
      life = malloc (sizeof *life);
      if (!life)
	goto cleanup;
      life->sadb_lifetime_len = sizeof *life / PF_KEY_V2_CHUNK;
      life->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
      life->sadb_lifetime_allocations = 0;
      life->sadb_lifetime_bytes = sa->kilobytes * 1024;
      /*
       * XXX I am not sure which one is best in security respect.  Maybe the
       * RFCs actually mandate what a lifetime really is.
       */
#if 0
      life->sadb_lifetime_addtime = 0;
      life->sadb_lifetime_usetime = sa->seconds;
#else
      life->sadb_lifetime_addtime = sa->seconds;
      life->sadb_lifetime_usetime = 0;
#endif
      if (pf_key_v2_msg_add (update, (struct sadb_ext *)life,
			     PF_KEY_V2_NODE_MALLOCED) == -1)
	goto cleanup;
      life = 0;

      /*
       * Setup the soft limits, we use 90 % of the hard ones.
       * XXX A configurable ratio would be better.
       */
      life = malloc (sizeof *life);
      if (!life)
	goto cleanup;
      life->sadb_lifetime_len = sizeof *life / PF_KEY_V2_CHUNK;
      life->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
      life->sadb_lifetime_allocations = 0;
      life->sadb_lifetime_bytes = sa->kilobytes * 1024 * 9 / 10;
      /*
       * XXX I am not sure which one is best in security respect.  Maybe the
       * RFCs actually mandate what a lifetime really is.
       */
#if 0
      life->sadb_lifetime_addtime = 0;
      life->sadb_lifetime_usetime = sa->seconds * 9 / 10;
#else
      life->sadb_lifetime_addtime = sa->seconds * 9 / 10;
      life->sadb_lifetime_usetime = 0;
#endif
      if (pf_key_v2_msg_add (update, (struct sadb_ext *)life,
			     PF_KEY_V2_NODE_MALLOCED) == -1)
	goto cleanup;
      life = 0;
    }

  /*
   * Setup the ADDRESS extensions.
   */
  if (incoming)
    sa->transport->vtbl->get_dst (sa->transport, &src);
  else
    sa->transport->vtbl->get_src (sa->transport, &src);
  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (src));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
  addr->sadb_address_proto = 0;
  addr->sadb_address_prefixlen = 0;
#endif
  addr->sadb_address_reserved = 0;
  memcpy (addr + 1, src, sysdep_sa_len (src));
  switch (((struct sockaddr *)(addr + 1))->sa_family)
    {
    case AF_INET:
      ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)(addr + 1))->sin6_port = 0;
      break;
    }
  if (pf_key_v2_msg_add (update, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (dst));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
  addr->sadb_address_proto = 0;
  addr->sadb_address_prefixlen = 0;
#endif
  addr->sadb_address_reserved = 0;
  memcpy (addr + 1, dst, sysdep_sa_len (dst));
  switch (((struct sockaddr *)(addr + 1))->sa_family)
    {
    case AF_INET:
      ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)(addr + 1))->sin6_port = 0;
      break;
    }
  if (pf_key_v2_msg_add (update, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

#if 0
  /* XXX I am not sure about what to do here just yet.  */
  if (iproto->encap_mode == IPSEC_ENCAP_TUNNEL)
    {
      len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (dst));
      addr = calloc (1, len);
      if (!addr)
	goto cleanup;
      addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
      addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
      addr->sadb_address_proto = 0;
      addr->sadb_address_prefixlen = 0;
#endif
      addr->sadb_address_reserved = 0;
      memcpy (addr + 1, dst, sysdep_sa_len (dst));
      switch (((struct sockaddr *)(addr + 1))->sa_family)
	{
	case AF_INET:
	  ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
	  break;
	case AF_INET6:
	  ((struct sockaddr_in6 *)(addr + 1))->sin6_port = 0;
	  break;
	}
      if (pf_key_v2_msg_add (update, (struct sadb_ext *)addr,
			     PF_KEY_V2_NODE_MALLOCED) == -1)
	goto cleanup;
      addr = 0;
#if 0
      msg->em_odst = msg->em_dst;
      msg->em_osrc = msg->em_src;
#endif
    }
#endif

  /* Setup the KEY extensions.  */
  len = sizeof *key + PF_KEY_V2_ROUND (hashlen);
  key = malloc (len);
  if (!key)
    goto cleanup;
  key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
  key->sadb_key_len = len / PF_KEY_V2_CHUNK;
  key->sadb_key_bits = hashlen * 8;
  key->sadb_key_reserved = 0;
  memcpy (key + 1,
	  iproto->keymat[incoming]
	  + (proto->proto == IPSEC_PROTO_IPSEC_ESP ? keylen : 0),
	  hashlen);
  if (pf_key_v2_msg_add (update, (struct sadb_ext *)key,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  key = 0;

  if (keylen)
    {
      len = sizeof *key + PF_KEY_V2_ROUND (keylen);
      key = malloc (len);
      if (!key)
	goto cleanup;
      key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
      key->sadb_key_len = len / PF_KEY_V2_CHUNK;
      key->sadb_key_bits = keylen * 8;
      key->sadb_key_reserved = 0;
      memcpy (key + 1, iproto->keymat[incoming], keylen);
      if (pf_key_v2_msg_add (update, (struct sadb_ext *)key,
			     PF_KEY_V2_NODE_MALLOCED) == -1)
	goto cleanup;
      key = 0;
    }

#ifndef KAME
  /* Setup identity extensions. */
  if (isakmp_sa->id_i)
    {
      pp = pf_key_v2_convert_id (isakmp_sa->id_i, isakmp_sa->id_i_len,
				 &len, &idtype);
      if (!pp)
	goto nosid;

      sid = calloc (PF_KEY_V2_ROUND (len + 1) + sizeof *sid, sizeof (u_int8_t));
      if (!sid)
	{
	  free (pp);
	  goto cleanup;
	}

      sid->sadb_ident_type = idtype;
      sid->sadb_ident_len = ((sizeof *sid) / PF_KEY_V2_CHUNK)
			    + PF_KEY_V2_ROUND (len + 1) / PF_KEY_V2_CHUNK;
      if ((isakmp_sa->initiator && !incoming)
	  || (!isakmp_sa->initiator && incoming))
	sid->sadb_ident_exttype = SADB_EXT_IDENTITY_SRC;
      else
	sid->sadb_ident_exttype = SADB_EXT_IDENTITY_DST;

      memcpy(sid + 1, pp, len);
      free (pp);

      if (pf_key_v2_msg_add (update, (struct sadb_ext *)sid,
			      PF_KEY_V2_NODE_MALLOCED) == -1)
	goto cleanup;
      sid = 0;

 nosid:
      if (sid)
	free (sid);
      sid = 0;
    }

  if (isakmp_sa->id_r)
    {
      pp = pf_key_v2_convert_id (isakmp_sa->id_r, isakmp_sa->id_r_len,
				 &len, &idtype);
      if (!pp)
	goto nodid;

      sid = calloc (PF_KEY_V2_ROUND (len + 1) + sizeof *sid, sizeof (u_int8_t));
      if (!sid)
	{
	  free (pp);
	  goto cleanup;
	}

      sid->sadb_ident_type = idtype;
      sid->sadb_ident_len = ((sizeof *sid) / PF_KEY_V2_CHUNK)
			    + PF_KEY_V2_ROUND (len + 1) / PF_KEY_V2_CHUNK;
      if ((isakmp_sa->initiator && !incoming)
	  || (!isakmp_sa->initiator && incoming))
	sid->sadb_ident_exttype = SADB_EXT_IDENTITY_DST;
      else
	sid->sadb_ident_exttype = SADB_EXT_IDENTITY_SRC;

      memcpy (sid + 1, pp, len);
      free (pp);

      if (pf_key_v2_msg_add (update, (struct sadb_ext *)sid,
			      PF_KEY_V2_NODE_MALLOCED) == -1)
	goto cleanup;
      sid = 0;

 nodid:
      if (sid)
	free (sid);
      sid = 0;
    }
#endif /* KAME */

#ifdef SADB_X_CREDTYPE_NONE
  /*
   * Send received credentials to the kernel. We don't bother with
   * our credentials, since the process either knows them (if it specified
   * them with setsockopt()), or has no business looking at them (e.g.,
   * system wide certs).
   */
  if (isakmp_sa->recv_cert)
    {
      switch (isakmp_sa->recv_certtype)
	{
	case ISAKMP_CERTENC_NONE:
	  /* Nothing to be done here. */
	  break;

#if defined (USE_KEYNOTE) && defined (SADB_X_EXT_REMOTE_CREDENTIALS)
	case ISAKMP_CERTENC_KEYNOTE:
	  len = strlen (isakmp_sa->recv_cert);
	  cred = calloc (PF_KEY_V2_ROUND (len) + sizeof *cred,
			 sizeof (u_int8_t));
	  if (!cred)
	    goto cleanup;

	  cred->sadb_x_cred_len = ((sizeof *cred) / PF_KEY_V2_CHUNK) +
	    PF_KEY_V2_ROUND (len) / PF_KEY_V2_CHUNK;
	  cred->sadb_x_cred_exttype = SADB_X_EXT_REMOTE_CREDENTIALS;
	  cred->sadb_x_cred_type = SADB_X_CREDTYPE_KEYNOTE;
	  memcpy (cred + 1, isakmp_sa->recv_cert, len);

	  if (pf_key_v2_msg_add (update, (struct sadb_ext *)cred,
				 PF_KEY_V2_NODE_MALLOCED) == -1)
	    goto cleanup;
	  break;
#endif /* USE_KEYNOTE */

#if defined (USE_X509) && defined (SADB_X_EXT_REMOTE_CREDENTIALS)
	case ISAKMP_CERTENC_X509_SIG:
	  {
	    u_int8_t *data;
	    u_int32_t datalen;
	    struct cert_handler *handler;

	    /* We do it this way to avoid weird includes. */
	    handler = cert_get (ISAKMP_CERTENC_X509_SIG);
	    if (!handler)
	      break;
	    handler->cert_serialize (isakmp_sa->recv_cert, &data, &datalen);
	    if (!data)
	      break;

	    len = datalen;
	    cred = calloc (PF_KEY_V2_ROUND (len) + sizeof *cred,
			   sizeof (u_int8_t));
	    if (!cred)
	      {
		free (data);
		goto cleanup;
	      }

	    cred->sadb_x_cred_len = ((sizeof *cred) / PF_KEY_V2_CHUNK) +
	      PF_KEY_V2_ROUND (len) / PF_KEY_V2_CHUNK;
	    cred->sadb_x_cred_exttype = SADB_X_EXT_REMOTE_CREDENTIALS;
	    cred->sadb_x_cred_type = SADB_X_CREDTYPE_X509;
	    memcpy (cred + 1, data, len);
	    free (data);

	    if (pf_key_v2_msg_add (update, (struct sadb_ext *)cred,
				   PF_KEY_V2_NODE_MALLOCED) == -1)
	      goto cleanup;
	  }
	  break;
#endif /* USE_X509 */
	}
    }
#endif /* SADB_X_CREDTYPE_NONE */

#ifdef SADB_X_AUTHTYPE_NONE
  /*
   * Tell the kernel what the peer used to authenticate, unless it was a
   * passphrase.
   */
  if (isakmp_sa->recv_key)
    {
      u_int8_t *data;

      /*
       * If it's a private key, we shouldn't pass it to the kernel for
       * processes to see; successful authentication of Phase 1 implies
       * that the process already knew the passphrase. On the other hand,
       * we don't want to reveal to processes any system-wide passphrases
       * used for authentication with remote systems. Same reason we don't
       * send up the key (private or passphrase) we used to authenticate
       * with the peer.
       */
      if (isakmp_sa->recv_keytype == ISAKMP_KEY_PASSPHRASE)
	goto doneauth;

      key_serialize (isakmp_sa->recv_keytype, ISAKMP_KEYTYPE_PUBLIC,
		     isakmp_sa->recv_key, &data, &len);
      if (!data)
	goto cleanup;

      cred = calloc (PF_KEY_V2_ROUND (len) + sizeof *cred, sizeof (u_int8_t));
      if (!cred)
	{
	  free (data);
	  goto cleanup;
	}

      cred->sadb_x_cred_len = ((sizeof *cred) / PF_KEY_V2_CHUNK) +
	PF_KEY_V2_ROUND (len) / PF_KEY_V2_CHUNK;
      cred->sadb_x_cred_exttype = SADB_X_EXT_REMOTE_AUTH;
      memcpy (cred + 1, data, len);
      free (data);

      switch (isakmp_sa->recv_keytype)
	{
	case ISAKMP_KEY_RSA:
	  cred->sadb_x_cred_type = SADB_X_AUTHTYPE_RSA;
	  break;

	default:
	  log_print ("pf_key_v2_set_spi: unknown received key type %d",
		     isakmp_sa->recv_keytype);
	  free (cred);
	  goto cleanup;
	}

      if (pf_key_v2_msg_add (update, (struct sadb_ext *)cred,
			     PF_KEY_V2_NODE_MALLOCED) == -1)
	goto cleanup;
    }
 doneauth:
#endif /* SADB_X_AUTHTYPE_NONE */

  /* XXX Here can sensitivity extensions be setup.  */

#ifdef USE_DEBUG
  if (sockaddr2text (dst, &addr_str, 0))
    addr_str = 0;

  LOG_DBG ((LOG_SYSDEP, 10, "pf_key_v2_set_spi: satype %d dst %s SPI 0x%x",
	    msg.sadb_msg_satype, addr_str ? addr_str : "unknown",
	    ntohl (ssa.sadb_sa_spi)));

  if (addr_str)
    free (addr_str);
#endif /* USE_DEBUG */

  /*
   * Although PF_KEY knows about expirations, it is unreliable per the specs
   * thus we need to do them inside isakmpd as well.
   */
  if (sa->seconds)
    if (sa_setup_expirations (sa))
      goto cleanup;

  ret = pf_key_v2_call (update);
  pf_key_v2_msg_free (update);
  update = 0;
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  pf_key_v2_msg_free (ret);
  ret = 0;

  /*
   * If we are doing an addition into an SADB shared with our peer, errors
   * here are to be expected as the peer will already have created the SA,
   * and can thus be ignored.
   */
  if (err && !(msg.sadb_msg_type == SADB_ADD
	       && conf_get_str ("General", "Shared-SADB")))
    {
      log_print ("pf_key_v2_set_spi: %s: %s",
		 msg.sadb_msg_type == SADB_ADD ? "ADD" : "UPDATE",
		 strerror (err));
      goto cleanup;
    }

  LOG_DBG ((LOG_SYSDEP, 50, "pf_key_v2_set_spi: done"));

  return 0;

 cleanup:
  if (sid)
    free (sid);
  if (addr)
    free (addr);
  if (life)
    free (life);
  if (key)
    free (key);
  if (update)
    pf_key_v2_msg_free (update);
  if (ret)
    pf_key_v2_msg_free (ret);
  return -1;
}

static __inline__ int
pf_key_v2_mask_to_bits (u_int32_t mask)
{
  u_int32_t hmask = ntohl (mask);
  return (33 - ffs (~hmask + 1)) % 33;
}

static int
pf_key_v2_mask6_to_bits (u_int8_t *mask)
{
  int n;
  bit_ffc (mask, 128, &n);
  return n;
}

static void
pf_key_v2_setup_sockaddr (void *res, struct sockaddr *src,
			  struct sockaddr *dst, in_port_t port, int ingress)
{
  struct sockaddr_in *ip4_sa;
  struct sockaddr_in6 *ip6_sa;
  u_int8_t *p;

  switch (src->sa_family)
    {
    case AF_INET:
      ip4_sa = (struct sockaddr_in *)res;
      ip4_sa->sin_family = AF_INET;
      ip4_sa->sin_len = sizeof *ip4_sa;
      ip4_sa->sin_port = port;
      if (dst)
	p = (u_int8_t *)(ingress
			 ? &((struct sockaddr_in *)src)->sin_addr.s_addr
			 : &((struct sockaddr_in *)dst)->sin_addr.s_addr);
      else
	p = (u_int8_t *)&((struct sockaddr_in *)src)->sin_addr.s_addr;
      ip4_sa->sin_addr.s_addr = *((in_addr_t *)p);
      break;

    case AF_INET6:
      ip6_sa = (struct sockaddr_in6 *)res;
      ip6_sa->sin6_family = AF_INET6;
      ip6_sa->sin6_len = sizeof *ip6_sa;
      ip6_sa->sin6_port = port;
      if (dst)
	p = (u_int8_t *)(ingress
			 ? &((struct sockaddr_in6 *)src)->sin6_addr.s6_addr
			 : &((struct sockaddr_in6 *)dst)->sin6_addr.s6_addr);
      else
	p = (u_int8_t *)&((struct sockaddr_in6 *)src)->sin6_addr.s6_addr;
      memcpy (ip6_sa->sin6_addr.s6_addr, p, sizeof (struct in6_addr));
      break;

    default:
      log_print ("pf_key_v2_setup_sockaddr: unknown family %d\n",
		 src->sa_family);
      break;
    }
}

/*
 * Enable/disable a flow.
 * XXX Assumes OpenBSD {ADD,DEL}FLOW extensions.
 * Should probably be moved to sysdep.c
 */
static int
pf_key_v2_flow (struct sockaddr *laddr, struct sockaddr *lmask,
		struct sockaddr *raddr,	struct sockaddr *rmask,
		u_int8_t tproto, u_int16_t sport, u_int16_t dport,
		u_int8_t *spi, u_int8_t proto, struct sockaddr *dst,
		struct sockaddr *src, int delete, int ingress,
		u_int8_t srcid_type, u_int8_t *srcid, int srcid_len,
		u_int8_t dstid_type, u_int8_t *dstid, int dstid_len)
{
#ifdef USE_DEBUG
  char *laddr_str, *lmask_str, *raddr_str, *rmask_str;
#endif
#if defined (SADB_X_ADDFLOW) && defined (SADB_X_DELFLOW)
  struct sadb_msg msg;
#ifdef SADB_X_EXT_FLOW_TYPE
  struct sadb_protocol flowtype;
  struct sadb_ident *sid = 0;
#else
  struct sadb_sa ssa;
#endif
  struct sadb_address *addr = 0;
  struct sadb_protocol tprotocol;
  struct pf_key_v2_msg *flow = 0, *ret = 0;
  size_t len;
  int err;

#if !defined (SADB_X_SAFLAGS_INGRESS_FLOW) && !defined (SADB_X_EXT_FLOW_TYPE)
  if (ingress)
    return 0;
#endif

  msg.sadb_msg_type = delete ? SADB_X_DELFLOW : SADB_X_ADDFLOW;
  switch (proto)
    {
    case IPSEC_PROTO_IPSEC_ESP:
      msg.sadb_msg_satype = SADB_SATYPE_ESP;
      break;
    case IPSEC_PROTO_IPSEC_AH:
      msg.sadb_msg_satype = SADB_SATYPE_AH;
      break;
    default:
      log_print ("pf_key_v2_flow: invalid proto %d", proto);
      goto cleanup;
    }
  msg.sadb_msg_seq = 0;
  flow = pf_key_v2_msg_new (&msg, 0);
  if (!flow)
    goto cleanup;

#ifdef SADB_X_EXT_FLOW_TYPE
  if (!delete)
    {
      /* Setup the source ID, if provided. */
      if (srcid)
        {
	  sid = calloc (PF_KEY_V2_ROUND (srcid_len + 1) + sizeof *sid,
			sizeof (u_int8_t));
	  if (!sid)
	    goto cleanup;

	  sid->sadb_ident_len = ((sizeof *sid) / PF_KEY_V2_CHUNK)
	    + PF_KEY_V2_ROUND (srcid_len + 1) / PF_KEY_V2_CHUNK;
	  sid->sadb_ident_exttype = SADB_EXT_IDENTITY_SRC;
	  sid->sadb_ident_type = srcid_type;

	  memcpy (sid + 1, srcid, srcid_len);

	  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)sid,
				 PF_KEY_V2_NODE_MALLOCED) == -1)
	    goto cleanup;

	  sid = 0;
	}

      /* Setup the destination ID, if provided. */
      if (dstid)
        {
	  sid = calloc (PF_KEY_V2_ROUND (dstid_len + 1) + sizeof *sid,
			sizeof (u_int8_t));
	  if (!sid)
	    goto cleanup;

	  sid->sadb_ident_len = ((sizeof *sid) / PF_KEY_V2_CHUNK)
	    + PF_KEY_V2_ROUND (dstid_len + 1) / PF_KEY_V2_CHUNK;
	  sid->sadb_ident_exttype = SADB_EXT_IDENTITY_DST;
	  sid->sadb_ident_type = dstid_type;

	  memcpy (sid + 1, dstid, dstid_len);

	  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)sid,
				 PF_KEY_V2_NODE_MALLOCED) == -1)
	    goto cleanup;

	  sid = 0;
	}
    }

  /* Setup the flow type extension.  */
  bzero (&flowtype, sizeof flowtype);
  flowtype.sadb_protocol_exttype = SADB_X_EXT_FLOW_TYPE;
  flowtype.sadb_protocol_len = sizeof flowtype / PF_KEY_V2_CHUNK;
  flowtype.sadb_protocol_direction
    = ingress ? IPSP_DIRECTION_IN : IPSP_DIRECTION_OUT;
  flowtype.sadb_protocol_proto
    = ingress ? SADB_X_FLOW_TYPE_USE : SADB_X_FLOW_TYPE_REQUIRE;

  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)&flowtype, 0) == -1)
    goto cleanup;
#else /* SADB_X_EXT_FLOW_TYPE */
  /* Setup the SA extension.  */
  ssa.sadb_sa_exttype = SADB_EXT_SA;
  ssa.sadb_sa_len = sizeof ssa / PF_KEY_V2_CHUNK;
  memcpy (&ssa.sadb_sa_spi, spi, sizeof ssa.sadb_sa_spi);
  ssa.sadb_sa_replay = 0;
  ssa.sadb_sa_state = 0;
  ssa.sadb_sa_auth = 0;
  ssa.sadb_sa_encrypt = 0;
  ssa.sadb_sa_flags = 0;
#ifdef SADB_X_SAFLAGS_INGRESS_FLOW
  if (ingress)
    ssa.sadb_sa_flags |= SADB_X_SAFLAGS_INGRESS_FLOW;
#endif
#ifdef SADB_X_SAFLAGS_REPLACEFLOW
  if (!delete && !ingress)
    ssa.sadb_sa_flags |= SADB_X_SAFLAGS_REPLACEFLOW;
#endif

  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)&ssa, 0) == -1)
    goto cleanup;
#endif /* SADB_X_EXT_FLOW_TYPE */

  /*
   * Setup the ADDRESS extensions.
   */
  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (src));
#ifndef SADB_X_EXT_FLOW_TYPE
  if (!delete || ingress)
#else
  if (!delete)
#endif /* SADB_X_EXT_FLOW_TYPE */
    {
      addr = calloc (1, len);
      if (!addr)
	goto cleanup;
      addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
      addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
      addr->sadb_address_reserved = 0;
#ifdef SADB_X_EXT_FLOW_TYPE
      pf_key_v2_setup_sockaddr (addr + 1, src, dst, 0, ingress);
#else
      pf_key_v2_setup_sockaddr (addr + 1, dst, 0, 0, 0);
#endif
      if (pf_key_v2_msg_add (flow, (struct sadb_ext *)addr,
			     PF_KEY_V2_NODE_MALLOCED) == -1)
	goto cleanup;
      addr = 0;
    }

  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (laddr));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_X_EXT_SRC_FLOW;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
  addr->sadb_address_reserved = 0;
  pf_key_v2_setup_sockaddr (addr + 1, laddr, 0, sport, 0);
  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_X_EXT_SRC_MASK;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
  addr->sadb_address_reserved = 0;
  pf_key_v2_setup_sockaddr (addr + 1, lmask, 0, sport ? 0xffff : 0, 0);
  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_X_EXT_DST_FLOW;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
  addr->sadb_address_reserved = 0;
  pf_key_v2_setup_sockaddr (addr + 1, raddr, 0, sport, 0);
  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_X_EXT_DST_MASK;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
  addr->sadb_address_reserved = 0;
  pf_key_v2_setup_sockaddr (addr + 1, rmask, 0, sport ? 0xffff : 0, 0);
  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  /* Setup the protocol extension.  */
  bzero (&tprotocol, sizeof tprotocol);
  tprotocol.sadb_protocol_exttype = SADB_X_EXT_PROTOCOL;
  tprotocol.sadb_protocol_len = sizeof tprotocol / PF_KEY_V2_CHUNK;
  tprotocol.sadb_protocol_proto = tproto;

  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)&tprotocol, 0) == -1)
    goto cleanup;

#ifdef USE_DEBUG
  if (sockaddr2text (laddr, &laddr_str, 0))
    laddr_str = 0;
  if (sockaddr2text (lmask, &lmask_str, 0))
    lmask_str = 0;
  if (sockaddr2text (raddr, &raddr_str, 0))
    raddr_str = 0;
  if (sockaddr2text (rmask, &rmask_str, 0))
    rmask_str = 0;

  LOG_DBG ((LOG_SYSDEP, 50,
	    "pf_key_v2_flow: src %s %s dst %s %s proto %u sport %u dport %u",
	    laddr_str ? laddr_str : "<???>", lmask_str ? lmask_str : "<???>",
	    raddr_str ? raddr_str : "<???>", rmask_str ? rmask_str : "<???>",
	    tproto, ntohs (sport), ntohs (dport)));

  if (laddr_str)
    free (laddr_str);
  if (lmask_str)
    free (lmask_str);
  if (raddr_str)
    free (raddr_str);
  if (rmask_str)
    free (rmask_str);
#endif /* USE_DEBUG */

  ret = pf_key_v2_call (flow);
  pf_key_v2_msg_free (flow);
  flow = 0;
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  if (err)
    {
      if (err == ESRCH) /* These are common and usually harmless.  */
	LOG_DBG ((LOG_SYSDEP, 10, "pf_key_v2_flow: %sFLOW: %s",
		  delete ? "DEL" : "ADD", strerror (err)));
      else
	log_print ("pf_key_v2_flow: %sFLOW: %s", delete ? "DEL" : "ADD",
		   strerror (err));
      goto cleanup;
    }
  pf_key_v2_msg_free (ret);

  LOG_DBG ((LOG_MISC, 50, "pf_key_v2_flow: %sFLOW: done",
	    delete ? "DEL" : "ADD"));

  return 0;

 cleanup:
#ifdef SADB_X_EXT_FLOW_TYPE
  if (sid)
    free (sid);
#endif /* SADB_X_EXT_FLOW_TYPE */
  if (addr)
    free (addr);
  if (flow)
    pf_key_v2_msg_free (flow);
  if (ret)
    pf_key_v2_msg_free (ret);
  return -1;

#elif defined (SADB_X_SPDADD) && defined (SADB_X_SPDDELETE)
  struct sadb_msg msg;
  struct sadb_x_policy *policy = 0;
  struct sadb_x_ipsecrequest *ipsecrequest;
  struct sadb_x_sa2 ssa2;
  struct sadb_address *addr = 0;
  struct sockaddr *saddr;
  struct pf_key_v2_msg *flow = 0, *ret = 0;
  u_int8_t *policy_buf;
  size_t len;
  int err;
  struct sockaddr_in *ip4_sa;
  struct sockaddr_in6 *ip6_sa;

  msg.sadb_msg_type = delete ? SADB_X_SPDDELETE : SADB_X_SPDADD;
  msg.sadb_msg_satype = SADB_SATYPE_UNSPEC;
  msg.sadb_msg_seq = 0;
  flow = pf_key_v2_msg_new (&msg, 0);
  if (!flow)
    goto cleanup;

  memset (&ssa2, 0, sizeof ssa2);
  ssa2.sadb_x_sa2_exttype = SADB_X_EXT_SA2;
  ssa2.sadb_x_sa2_len = sizeof ssa2 / PF_KEY_V2_CHUNK;
  ssa2.sadb_x_sa2_mode = 0;
  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)&ssa2, 0) == -1)
    goto cleanup;

  /*
   * Setup the ADDRESS extensions.
   */
  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (src));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
  addr->sadb_address_proto = IPSEC_ULPROTO_ANY;
  addr->sadb_address_reserved = 0;
  pf_key_v2_setup_sockaddr (addr + 1, laddr, 0, IPSEC_PORT_ANY, 0);
  switch (laddr->sa_family)
    {
    case AF_INET:
      ip4_sa = (struct sockaddr_in *)lmask;
      addr->sadb_address_prefixlen
	= pf_key_v2_mask_to_bits (ip4_sa->sin_addr.s_addr);
      break;
    case AF_INET6:
      ip6_sa = (struct sockaddr_in6 *)lmask;
      addr->sadb_address_prefixlen
	= pf_key_v2_mask6_to_bits (&ip6_sa->sin6_addr.s6_addr[0]);
      break;
    }
  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (raddr));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
  addr->sadb_address_proto = IPSEC_ULPROTO_ANY;
  addr->sadb_address_reserved = 0;
  pf_key_v2_setup_sockaddr (addr + 1, raddr, 0, IPSEC_PORT_ANY, 0);
  switch (raddr->sa_family)
    {
    case AF_INET:
      ip4_sa = (struct sockaddr_in *)rmask;
      addr->sadb_address_prefixlen
	= pf_key_v2_mask_to_bits (ip4_sa->sin_addr.s_addr);
      break;
    case AF_INET6:
      ip6_sa = (struct sockaddr_in6 *)rmask;
      addr->sadb_address_prefixlen
	= pf_key_v2_mask6_to_bits (&ip6_sa->sin6_addr.s6_addr[0]);
      break;
    }
  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  /* Setup the POLICY extension.  */
  len = sizeof *policy + sizeof *ipsecrequest +
    2 * PF_KEY_V2_ROUND (sysdep_sa_len (src));
  policy_buf = (u_int8_t *)calloc (1, len);
  if (!policy_buf)
    {
      log_error ("pf_key_v2_flow: calloc %d failed", len);
      goto cleanup;
    }

  policy = (struct sadb_x_policy *)policy_buf;
  policy->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
  policy->sadb_x_policy_len = len / PF_KEY_V2_CHUNK;
  policy->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
  if (ingress)
  	policy->sadb_x_policy_dir = IPSEC_DIR_INBOUND;
  else
  	policy->sadb_x_policy_dir = IPSEC_DIR_OUTBOUND;
  policy->sadb_x_policy_reserved = 0;

  /* Setup the IPSECREQUEST extension part.  */
  ipsecrequest = (struct sadb_x_ipsecrequest *)(policy + 1);
  ipsecrequest->sadb_x_ipsecrequest_len = len - sizeof *policy;
  switch (proto)
    {
    case IPSEC_PROTO_IPSEC_ESP:
      ipsecrequest->sadb_x_ipsecrequest_proto = IPPROTO_ESP;
      break;
    case IPSEC_PROTO_IPSEC_AH:
      ipsecrequest->sadb_x_ipsecrequest_proto = IPPROTO_AH;
      break;
    default:
      log_print ("pf_key_v2_flow: invalid proto %d", proto);
      goto cleanup;
    }
  ipsecrequest->sadb_x_ipsecrequest_mode = IPSEC_MODE_TUNNEL;	/* XXX */
  ipsecrequest->sadb_x_ipsecrequest_level
    = ingress ? IPSEC_LEVEL_USE : IPSEC_LEVEL_REQUIRE;
  ipsecrequest->sadb_x_ipsecrequest_reqid = 0;	/* XXX */

  /* Add source and destination addresses. */
  saddr = (struct sockaddr *)(ipsecrequest + 1);
  pf_key_v2_setup_sockaddr (saddr, src, 0, 0, 0);
  switch (src->sa_family)
    {
    case AF_INET:
      saddr = (struct sockaddr *)((struct sockaddr_in *)saddr + 1);
      break;
    case AF_INET6:
      saddr = (struct sockaddr *)((struct sockaddr_in6 *)saddr + 1);
      break;
    }
  pf_key_v2_setup_sockaddr (saddr, dst, 0, 0, 0);
  if (pf_key_v2_msg_add (flow, (struct sadb_ext *)policy, 0) == -1)
    goto cleanup;

#ifdef USE_DEBUG
  if (sockaddr2text (laddr, &laddr_str, 0))
    laddr_str = 0;
  if (sockaddr2text (lmask, &lmask_str, 0))
    lmask_str = 0;
  if (sockaddr2text (raddr, &raddr_str, 0))
    raddr_str = 0;
  if (sockaddr2text (rmask, &rmask_str, 0))
    rmask_str = 0;

  LOG_DBG ((LOG_SYSDEP, 50, "pf_key_v2_flow: src %x %x dst %x %x",
	    laddr_str ? laddr_str : "<???>", lmask_str ? laddr_str : "<???>",
	    raddr_str ? laddr_str : "<???>", rmask_str ? laddr_str : "<???>"));

  if (laddr_str)
    free (laddr_str);
  if (lmask_str)
    free (lmask_str);
  if (raddr_str)
    free (raddr_str);
  if (rmask_str)
    free (rmask_str);
#endif

  ret = pf_key_v2_call (flow);
  pf_key_v2_msg_free (flow);
  flow = 0;
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  if (!delete && err == EEXIST)
    {
      LOG_DBG ((LOG_SYSDEP, 50, "pf_key_v2_flow: SPDADD returns EEXIST"));
    }
  else if (err)
    {
      log_print ("pf_key_v2_flow: SPD%s: %s", delete ? "DELETE" : "ADD",
		 strerror (err));
      goto cleanup;
    }
  pf_key_v2_msg_free (ret);

  LOG_DBG ((LOG_SYSDEP, 50, "pf_key_v2_flow: SPD%s: done",
	    delete ? "DELETE" : "ADD"));

  return 0;

 cleanup:
  if (addr)
    free (addr);
  if (policy)
    free (policy);
  if (flow)
    pf_key_v2_msg_free (flow);
  if (ret)
    pf_key_v2_msg_free (ret);
  return -1;

#else
  log_print ("pf_key_v2_flow: not supported in pure PF_KEYv2");
  return -1;
#endif
}

#ifndef KAME
static u_int8_t *
pf_key_v2_convert_id (u_int8_t *id, int idlen, size_t *reslen, int *idtype)
{
  u_int8_t *res = 0;
  char addrbuf[ADDRESS_MAX + 5];
  char *addr;

  switch (id[0])
    {
    case IPSEC_ID_FQDN:
      res = calloc (idlen - ISAKMP_ID_DATA_OFF + ISAKMP_GEN_SZ,
		    sizeof (u_int8_t));
      if (!res)
	return 0;

      *reslen = idlen - ISAKMP_ID_DATA_OFF + ISAKMP_GEN_SZ;
      memcpy (res, id + ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ, *reslen);
      *idtype = SADB_IDENTTYPE_FQDN;
      LOG_DBG ((LOG_SYSDEP, 40, "pf_key_v2_convert_id: FQDN %s", res));
      return res;

    case IPSEC_ID_USER_FQDN:
      res = calloc (idlen - ISAKMP_ID_DATA_OFF + ISAKMP_GEN_SZ,
		    sizeof (u_int8_t));
      if (!res)
	return 0;

      *reslen = idlen - ISAKMP_ID_DATA_OFF + ISAKMP_GEN_SZ;
      memcpy (res, id + ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ, *reslen);
      *idtype = SADB_IDENTTYPE_USERFQDN;
      LOG_DBG ((LOG_SYSDEP, 40, "pf_key_v2_convert_id: UFQDN %s", res));
      return res;

    case IPSEC_ID_IPV4_ADDR: /* XXX CONNECTION ? */
      if (inet_ntop (AF_INET, id + ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ,
		     addrbuf, ADDRESS_MAX) == NULL)
	return 0;
      *reslen = strlen (addrbuf) + 3;
      strcat (addrbuf, "/32");
      res = strdup (addrbuf);
      if (!res)
	return 0;
      *idtype = SADB_IDENTTYPE_PREFIX;
      LOG_DBG ((LOG_SYSDEP, 40, "pf_key_v2_convert_id: IPv4 address %s", res));
      return res;

    case IPSEC_ID_IPV6_ADDR: /* XXX CONNECTION ? */
      if (inet_ntop (AF_INET6, id + ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ,
		     addrbuf, ADDRESS_MAX) == NULL)
	return 0;
      *reslen = strlen (addrbuf) + 4;
      strcat (addrbuf, "/128");
      res = strdup (addrbuf);
      if (!res)
	return 0;
      LOG_DBG ((LOG_SYSDEP, 40, "pf_key_v2_convert_id: IPv6 address %s", res));
      *idtype = SADB_IDENTTYPE_PREFIX;
      return res;

    case IPSEC_ID_IPV4_ADDR_SUBNET: /* XXX PREFIX */
      addr = id + ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ;
      if (inet_ntop (AF_INET, addr, addrbuf, ADDRESS_MAX) == NULL)
	return 0;
      sprintf (addrbuf + strlen (addrbuf), "/%d",
	       pf_key_v2_mask_to_bits ((u_int32_t)
				       *(addr + sizeof (struct in_addr))));
      *reslen = strlen (addrbuf);
      res = strdup (addrbuf);
      if (!res)
	return 0;
      *idtype = SADB_IDENTTYPE_PREFIX;
      LOG_DBG ((LOG_SYSDEP, 40, "pf_key_v2_convert_id: IPv4 subnet %s", res));
      return res;

    case IPSEC_ID_IPV6_ADDR_SUBNET: /* XXX PREFIX */
      addr = id + ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ;
      if (inet_ntop (AF_INET6, addr, addrbuf, ADDRESS_MAX) == NULL)
	return 0;
      sprintf (addrbuf + strlen (addrbuf), "/%d",
	       pf_key_v2_mask6_to_bits (addr + sizeof (struct in6_addr)));
      *reslen = strlen (addrbuf);
      res = strdup (addrbuf);
      if (!res)
	return 0;
      LOG_DBG ((LOG_SYSDEP, 40, "pf_key_v2_convert_id: IPv6 subnet %s", res));
      *idtype = SADB_IDENTTYPE_PREFIX;
      return res;

    case IPSEC_ID_IPV4_RANGE:
    case IPSEC_ID_IPV6_RANGE:
    case IPSEC_ID_DER_ASN1_DN:
    case IPSEC_ID_DER_ASN1_GN:
    case IPSEC_ID_KEY_ID:
      /* XXX Not implemented yet.  */
      return 0;
    }

  return 0;
}
#endif

/* Enable a flow given a SA.  */
int
pf_key_v2_enable_sa (struct sa *sa, struct sa *isakmp_sa)
{
  struct ipsec_sa *isa = sa->data;
  struct sockaddr *dst, *src;
  int error;
  struct proto *proto = TAILQ_FIRST (&sa->protos);
  int sidtype = 0, didtype = 0;
  size_t sidlen = 0, didlen = 0;
  u_int8_t *sid = 0, *did = 0;
#ifndef SADB_X_EXT_FLOW_TYPE
  struct sockaddr_storage hostmask_storage;
  struct sockaddr *hostmask = (struct sockaddr *)&hostmask_storage;
#endif /* SADB_X_EXT_FLOW_TYPE */

  sa->transport->vtbl->get_dst (sa->transport, &dst);
  sa->transport->vtbl->get_src (sa->transport, &src);

#ifdef SADB_X_EXT_FLOW_TYPE
  if (isakmp_sa->id_i)
    {
      if (isakmp_sa->initiator)
	sid = pf_key_v2_convert_id (isakmp_sa->id_i, isakmp_sa->id_i_len,
				    &sidlen, &sidtype);
      else
	did = pf_key_v2_convert_id (isakmp_sa->id_i, isakmp_sa->id_i_len,
				    &didlen, &didtype);
    }

  if (isakmp_sa->id_r)
    {
      if (isakmp_sa->initiator)
	did = pf_key_v2_convert_id (isakmp_sa->id_r, isakmp_sa->id_r_len,
				    &didlen, &didtype);
      else
	sid = pf_key_v2_convert_id (isakmp_sa->id_r, isakmp_sa->id_r_len,
				    &sidlen, &sidtype);
    }
#endif /* SADB_X_EXT_FLOW_TYPE */

  error = pf_key_v2_flow (isa->src_net, isa->src_mask, isa->dst_net,
			  isa->dst_mask, isa->tproto, isa->sport, isa->dport,
			  proto->spi[0], proto->proto, dst, src, 0, 0,
			  sidtype, sid, sidlen, didtype, did, didlen);
  if (error)
    goto cleanup;

#ifndef SADB_X_EXT_FLOW_TYPE
  /* Set hostmask to '-1'. */
  switch (dst->sa_family)
    {
    case AF_INET:
      ((struct sockaddr_in *)hostmask)->sin_family = AF_INET;
      ((struct sockaddr_in *)hostmask)->sin_len = sizeof (struct in_addr);
      memset (&((struct sockaddr_in *)hostmask)->sin_addr.s_addr, 0xff,
	      sizeof (struct in_addr));
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)hostmask)->sin6_family = AF_INET6;
      ((struct sockaddr_in6 *)hostmask)->sin6_len = sizeof (struct in6_addr);
      memset (&((struct sockaddr_in6 *)hostmask)->sin6_addr.s6_addr, 0xff,
	      sizeof (struct in6_addr));
      break;
    }

  /* Ingress flows, handling SA bundles. */
  while (TAILQ_NEXT (proto, link))
    {
      error = pf_key_v2_flow (dst, hostmask, src, hostmask, 0, 0, 0,
			      proto->spi[1], proto->proto, src, dst,
			      0, 1, 0, 0, 0, 0, 0, 0);
      if (error)
	goto cleanup;
      proto = TAILQ_NEXT (proto, link);
    }
#endif /* SADB_X_EXT_FLOW_TYPE */

  error = pf_key_v2_flow (isa->dst_net, isa->dst_mask, isa->src_net,
			  isa->src_mask, isa->tproto, isa->dport, isa->sport,
			  proto->spi[1], proto->proto, src, dst, 0, 1,
			  sidtype, sid, sidlen, didtype, did, didlen);

 cleanup:
#ifdef SADB_X_EXT_FLOW_TYPE
  if (sid)
    free (sid);
  if (did)
    free (did);
#endif /* SADB_X_EXT_FLOW_TYPE */

  return error;
}

#ifdef SADB_X_ASKPOLICY
/* Increase reference count of refcounted sections. */
static int
pf_key_v2_conf_refinc (int af, char *section)
{
    unsigned char conn[22];
    int num;

    if (!section)
      return 0;

    num = conf_get_num (section, "Refcount", 0);
    if (num == 0)
      return 0;

    sprintf (conn, "%d", num + 1);
    conf_set (af, section, "Refcount", conn, 1, 0);
    return 0;
}
#endif

/*
 * Return 0 if the section didn't exist or was removed, non-zero otherwise.
 * Don't touch non-refcounted (statically defined) sections.
 */
static int
pf_key_v2_conf_refhandle (int af, char *section)
{
    unsigned char conn[22];
    int num;

    if (!section)
      return 0;

    num = conf_get_num (section, "Refcount", 0);
    if (num == 1)
      {
	conf_remove_section (af, section);
	num--;
      }
    else
      if (num != 0)
        {
	  sprintf (conn, "%d", num - 1);
	  conf_set (af, section, "Refcount", conn, 1, 0);
	}

    return num;
}

/* Remove all dynamically-established configuration entries.  */
static int
pf_key_v2_remove_conf (char *section)
{
    char *ikepeer, *localid, *remoteid, *configname;
    struct conf_list_node *attr;
    struct conf_list *attrs;
    int af;

    if (!section)
      return 0;

    if (!conf_get_str (section, "Phase"))
      return 0;

    /* Only remove dynamically-established entries. */
    attrs = conf_get_list (section, "Flags");
    if (attrs)
      {
	for (attr = TAILQ_FIRST (&attrs->fields); attr;
	     attr = TAILQ_NEXT (attr, link))
	  if (!strcasecmp (attr->field, "__ondemand"))
	    goto passed;

	conf_free_list (attrs);
      }

    return 0;

 passed:
    conf_free_list (attrs);

    af = conf_begin ();

    configname = conf_get_str (section, "Configuration");
    conf_remove_section (af, configname);

    /* These are the Phase 2 Local/Remote IDs. */
    localid = conf_get_str (section, "Local-ID");
    pf_key_v2_conf_refhandle (af, localid);

    remoteid = conf_get_str (section, "Remote-ID");
    pf_key_v2_conf_refhandle (af, remoteid);

    ikepeer = conf_get_str (section, "ISAKMP-peer");

    pf_key_v2_conf_refhandle (af, section);

    if (ikepeer)
      {
	remoteid = conf_get_str (ikepeer, "Remote-ID");
	localid = conf_get_str (ikepeer, "ID");
	configname = conf_get_str (ikepeer, "Configuration");

	pf_key_v2_conf_refhandle (af, ikepeer);
	pf_key_v2_conf_refhandle (af, configname);

	/* Phase 1 IDs */
	pf_key_v2_conf_refhandle (af, localid);
	pf_key_v2_conf_refhandle (af, remoteid);
      }

    conf_end (af, 1);
    return 0;
}

/* Disable a flow given a SA.  */
static int
pf_key_v2_disable_sa (struct sa *sa, int incoming)
{
  struct ipsec_sa *isa = sa->data;
  struct sockaddr *dst, *src;
  struct proto *proto = TAILQ_FIRST (&sa->protos);
#ifndef SADB_X_EXT_FLOW_TYPE
  struct sockaddr_storage hostmask_storage;
  struct sockaddr *hostmask = (struct sockaddr *)&hostmask_storage;
  int error;
#endif /* SADB_X_EXT_FLOW_TYPE */

  sa->transport->vtbl->get_dst (sa->transport, &dst);
  sa->transport->vtbl->get_src (sa->transport, &src);

  if (!incoming)
    return pf_key_v2_flow (isa->src_net, isa->src_mask, isa->dst_net,
			   isa->dst_mask, isa->tproto, isa->sport, isa->dport,
			   proto->spi[0], proto->proto, src, dst, 1, 0,
			   0, 0, 0, 0, 0, 0);
  else
    {
#ifndef SADB_X_EXT_FLOW_TYPE
      /* Set hostmask to '-1'. */
      switch (dst->sa_family)
	{
	case AF_INET:
	  ((struct sockaddr_in *)hostmask)->sin_family = AF_INET;
	  ((struct sockaddr_in *)hostmask)->sin_len = sizeof (struct in_addr);
	  memset (&((struct sockaddr_in *)hostmask)->sin_addr.s_addr, 0xff,
		  sizeof (struct in_addr));
	  break;
	case AF_INET6:
	  ((struct sockaddr_in6 *)hostmask)->sin6_family = AF_INET6;
	  ((struct sockaddr_in6 *)hostmask)->sin6_len =
	    sizeof (struct in6_addr);
	  memset (&((struct sockaddr_in6 *)hostmask)->sin6_addr.s6_addr, 0xff,
		  sizeof (struct in6_addr));
	  break;
	}

      /* Ingress flow --- SA bundles */
      while (TAILQ_NEXT (proto, link))
	{
          error = pf_key_v2_flow (dst, hostmask, src, hostmask, 0, 0, 0,
				  proto->spi[1], proto->proto, src, dst,
				  1, 1, 0, 0, 0, 0, 0, 0);
          if (error)
	    return error;
          proto = TAILQ_NEXT (proto, link);
	}
#endif /* SADB_X_EXT_FLOW_TYPE */

      return pf_key_v2_flow (isa->dst_net, isa->dst_mask, isa->src_net,
			     isa->src_mask, isa->tproto, isa->dport,
			     isa->sport, proto->spi[1], proto->proto,
			     src, dst, 1, 1, 0, 0, 0, 0, 0, 0);
    }
}

/*
 * Delete the IPsec SA represented by the INCOMING direction in protocol PROTO
 * of the IKE security association SA.  Also delete potential flows tied to it.
 */
int
pf_key_v2_delete_spi (struct sa *sa, struct proto *proto, int incoming)
{
  struct sadb_msg msg;
  struct sadb_sa ssa;
  struct sadb_address *addr = 0;
  struct sockaddr *saddr;
  int len, err;
  struct pf_key_v2_msg *delete = 0, *ret = 0;
#ifdef KAME
  struct sadb_x_sa2 ssa2;
#endif

  /* If it's not an established SA, don't proceed. */
  if (!(sa->flags & SA_FLAG_READY))
    return 0;

  /*
   * If the SA was not replaced and was not one acquired through the
   * kernel (ACQUIRE message), remove the flow associated with it.
   * We ignore any errors from the disabling of the flow.
   */
  if (!(sa->flags & SA_FLAG_REPLACED)
      && !(sa->flags & SA_FLAG_ONDEMAND))
    pf_key_v2_disable_sa (sa, incoming);

  if (sa->name && !(sa->flags & SA_FLAG_REPLACED))
    {
      LOG_DBG ((LOG_SYSDEP, 50,
		"pf_key_v2_delete_spi: removing configuration %s",
		sa->name));
      pf_key_v2_remove_conf (sa->name);
    }

  msg.sadb_msg_type = SADB_DELETE;
  switch (proto->proto)
    {
    case IPSEC_PROTO_IPSEC_ESP:
      msg.sadb_msg_satype = SADB_SATYPE_ESP;
      break;
    case IPSEC_PROTO_IPSEC_AH:
      msg.sadb_msg_satype = SADB_SATYPE_AH;
      break;
#ifdef SADB_X_SATYPE_IPCOMP
    case IPSEC_PROTO_IPCOMP:
      msg.sadb_msg_satype = SADB_X_SATYPE_IPCOMP;
      break;
#endif
    default:
      log_print ("pf_key_v2_delete_spi: invalid proto %d", proto->proto);
      goto cleanup;
    }
  msg.sadb_msg_seq = 0;
  delete = pf_key_v2_msg_new (&msg, 0);
  if (!delete)
    goto cleanup;

  /* Setup the SA extension.  */
  ssa.sadb_sa_exttype = SADB_EXT_SA;
  ssa.sadb_sa_len = sizeof ssa / PF_KEY_V2_CHUNK;
  memcpy (&ssa.sadb_sa_spi, proto->spi[incoming], sizeof ssa.sadb_sa_spi);
  ssa.sadb_sa_replay = 0;
  ssa.sadb_sa_state = 0;
  ssa.sadb_sa_auth = 0;
  ssa.sadb_sa_encrypt = 0;
  ssa.sadb_sa_flags = 0;
  if (pf_key_v2_msg_add (delete, (struct sadb_ext *)&ssa, 0) == -1)
    goto cleanup;

#ifdef KAME
  memset (&ssa2, 0, sizeof ssa2);
  ssa2.sadb_x_sa2_exttype = SADB_X_EXT_SA2;
  ssa2.sadb_x_sa2_len = sizeof ssa2 / PF_KEY_V2_CHUNK;
  ssa2.sadb_x_sa2_mode = 0;
  if (pf_key_v2_msg_add (delete, (struct sadb_ext *)&ssa2, 0) == -1)
    goto cleanup;
#endif

  /*
   * Setup the ADDRESS extensions.
   */
  if (incoming)
    sa->transport->vtbl->get_dst (sa->transport, &saddr);
  else
    sa->transport->vtbl->get_src (sa->transport, &saddr);
  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (saddr));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
  addr->sadb_address_proto = 0;
  addr->sadb_address_prefixlen = 0;
#endif
  addr->sadb_address_reserved = 0;
  memcpy (addr + 1, saddr, sysdep_sa_len (saddr));
  switch (saddr->sa_family)
    {
    case AF_INET:
      ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)(addr + 1))->sin6_port = 0;
      break;
    }
  if (pf_key_v2_msg_add (delete, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  if (incoming)
    sa->transport->vtbl->get_src (sa->transport, &saddr);
  else
    sa->transport->vtbl->get_dst (sa->transport, &saddr);
  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (saddr));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
  addr->sadb_address_proto = 0;
  addr->sadb_address_prefixlen = 0;
#endif
  addr->sadb_address_reserved = 0;
  memcpy (addr + 1, saddr, sysdep_sa_len (saddr));
  switch (saddr->sa_family)
    {
    case AF_INET:
      ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
      break;
    case AF_INET6:
      ((struct sockaddr_in6 *)(addr + 1))->sin6_port = 0;
      break;
    }
  if (pf_key_v2_msg_add (delete, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  ret = pf_key_v2_call (delete);
  pf_key_v2_msg_free (delete);
  delete = 0;
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  if (err)
    {
      LOG_DBG ((LOG_SYSDEP, 10, "pf_key_v2_delete_spi: DELETE: %s",
		strerror (err)));
      goto cleanup;
    }
  pf_key_v2_msg_free (ret);

  LOG_DBG ((LOG_SYSDEP, 50, "pf_key_v2_delete_spi: done"));

  return 0;

 cleanup:
  if (addr)
    free (addr);
  if (delete)
    pf_key_v2_msg_free (delete);
  if (ret)
    pf_key_v2_msg_free (ret);
  return -1;
}

static void
pf_key_v2_stayalive (struct exchange *exchange, void *vconn, int fail)
{
  char *conn = vconn;
  struct sa *sa;

  /* XXX What if it is phase 1 ? */
  sa = sa_lookup_by_name (conn, 2);
  if (sa)
    sa->flags |= SA_FLAG_STAYALIVE;

  /*
   * Remove failed configuration entry -- call twice because it is
   * created with a Refcount of 2.
   */
  if (fail && (!exchange || exchange->name))
    {
      pf_key_v2_remove_conf (conn);
      pf_key_v2_remove_conf (conn);
    }
}

/* Check if a connection CONN exists, otherwise establish it.  */
void
pf_key_v2_connection_check (char *conn)
{
  if (!sa_lookup_by_name (conn, 2))
    {
      LOG_DBG ((LOG_SYSDEP, 70,
		"pf_key_v2_connection_check: SA for %s missing", conn));
      exchange_establish (conn, pf_key_v2_stayalive, conn);
    }
  else
    LOG_DBG ((LOG_SYSDEP, 70, "pf_key_v2_connection_check: SA for %s exists",
	      conn));
}

/* Handle a PF_KEY lifetime expiration message PMSG.  */
static void
pf_key_v2_expire (struct pf_key_v2_msg *pmsg)
{
  struct sadb_msg *msg;
  struct sadb_sa *ssa;
  struct sadb_address *dst;
  struct sockaddr *dstaddr;
  struct sadb_lifetime *life, *lifecurrent;
  struct sa *sa;
  struct pf_key_v2_node *lifenode, *ext;
  char *dst_str;

  msg = (struct sadb_msg *)TAILQ_FIRST (pmsg)->seg;
  ext = pf_key_v2_find_ext (pmsg, SADB_EXT_SA);
  if (!ext)
    {
      log_print ("pf_key_v2_expire: no SA extension found");
      return;
    }
  ssa = ext->seg;
  ext = pf_key_v2_find_ext (pmsg, SADB_EXT_ADDRESS_DST);
  if (!ext)
    {
      log_print ("pf_key_v2_expire: no destination address extension found");
      return;
    }
  dst = ext->seg;
  dstaddr = (struct sockaddr *)(dst + 1);
  lifenode = pf_key_v2_find_ext (pmsg, SADB_EXT_LIFETIME_HARD);
  if (!lifenode)
    lifenode = pf_key_v2_find_ext (pmsg, SADB_EXT_LIFETIME_SOFT);
  if (!lifenode)
    {
      log_print ("pf_key_v2_expire: no lifetime extension found");
      return;
    }
  life = lifenode->seg;

  lifenode = pf_key_v2_find_ext (pmsg, SADB_EXT_LIFETIME_CURRENT);
  if (!lifenode)
    {
      log_print ("pf_key_v2_expire: no current lifetime extension found");
      return;
    }
  lifecurrent = lifenode->seg;

#ifdef USE_DEBUG

  if (sockaddr2text (dstaddr, &dst_str, 0))
    dst_str = 0;

  LOG_DBG ((LOG_SYSDEP, 20, "pf_key_v2_expire: %s dst %s SPI %x sproto %d",
	    life->sadb_lifetime_exttype == SADB_EXT_LIFETIME_SOFT ? "SOFT"
	    : "HARD", dst_str ? dst_str : "<unknown>",
	    ntohl (ssa->sadb_sa_spi), msg->sadb_msg_satype));

  if (dst_str)
    free (dst_str);

#endif /* USE_DEBUG */

  /*
   * Find the IPsec SA.  The IPsec stack has two SAs for every IKE SA,
   * one outgoing and one incoming, we regard expirations for any of
   * them as an expiration of the full IKE SA.  Likewise, in
   * protection suites consisting of more than one protocol, any
   * expired individual IPsec stack SA will be seen as an expiration
   * of the full suite.
   */
  switch (msg->sadb_msg_satype)
    {
    case SADB_SATYPE_ESP:
      sa = ipsec_sa_lookup (dstaddr, ssa->sadb_sa_spi, IPSEC_PROTO_IPSEC_ESP);
      break;

    case SADB_SATYPE_AH:
      sa = ipsec_sa_lookup (dstaddr, ssa->sadb_sa_spi, IPSEC_PROTO_IPSEC_AH);
      break;

#ifdef SADB_X_SATYPE_IPCOMP
    case SADB_X_SATYPE_IPCOMP:
      sa = ipsec_sa_lookup (dstaddr, ssa->sadb_sa_spi, IPSEC_PROTO_IPCOMP);
      break;
#endif

    default:
      /* XXX Log? */
      sa = 0;
      break;
    }

  /* If the SA is already gone, don't do anything.  */
  if (!sa)
    return;

  /*
   * If we got a notification, try to renegotiate the SA -- unless of
   * course it has already been replaced by another.
   * Also, ignore SAs that were not dynamically established, or that
   * did not see any use.
   */
  if (!(sa->flags & SA_FLAG_REPLACED) && (sa->flags & SA_FLAG_ONDEMAND) &&
      lifecurrent->sadb_lifetime_bytes)
    exchange_establish (sa->name, 0, 0);

  if (life->sadb_lifetime_exttype == SADB_EXT_LIFETIME_HARD)
    {
      /* Remove the old SA, it isn't useful anymore.  */
      sa_free (sa);
    }
}

/* Handle a PF_KEY SA ACQUIRE message PMSG.  */
static void
pf_key_v2_acquire (struct pf_key_v2_msg *pmsg)
{
#ifndef SADB_X_ASKPOLICY
  return;
#else
  struct sadb_msg *msg, askpolicy_msg;
  struct pf_key_v2_msg *askpolicy = 0, *ret = 0;
  struct sadb_x_policy policy;
  struct sadb_address *dst = 0, *src = 0;
  struct sockaddr *dstaddr, *srcaddr = 0;
  struct sadb_comb *scmb = 0;
  struct sadb_prop *sprp = 0;
  struct sadb_ident *srcident = 0, *dstident = 0;
  char dstbuf[ADDRESS_MAX], srcbuf[ADDRESS_MAX], *peer = 0, *conn = 0;
  char confname[120];
  char *srcid = 0, *dstid = 0, *prefstring = 0;
  int slen, af, afamily, masklen;
  struct sockaddr *smask, *sflow, *dmask, *dflow;
  struct sadb_protocol *sproto;
  char ssflow[ADDRESS_MAX], sdflow[ADDRESS_MAX];
  char sdmask[ADDRESS_MAX], ssmask[ADDRESS_MAX];
  char lname[100], dname[100], configname[30];
  int shostflag = 0, dhostflag = 0;
  struct pf_key_v2_node *ext;
  struct passwd *pwd = 0;
  u_int16_t sport = 0, dport = 0;
  u_int8_t tproto = 0;
  char tmbuf[sizeof sport * 3 + 1];
#ifdef SADB_X_CREDTYPE_NONE
  struct sadb_x_cred *cred = 0, *sauth = 0;
#endif

  /* This needs to be dynamically allocated. */
  conn = malloc (22);
  if (!conn)
    {
      log_error ("pf_key_v2_acquire: malloc (22) failed");
      return;
    }

  msg = (struct sadb_msg *)TAILQ_FIRST (pmsg)->seg;

  ext = pf_key_v2_find_ext (pmsg, SADB_EXT_ADDRESS_DST);
  if (!ext)
    {
      log_print ("pf_key_v2_acquire: no destination address specified");
      return;
    }
  dst = ext->seg;

  ext = pf_key_v2_find_ext (pmsg, SADB_EXT_ADDRESS_SRC);
  if (ext)
    src = ext->seg;

  ext = pf_key_v2_find_ext (pmsg, SADB_EXT_PROPOSAL);
  if (ext)
    {
      sprp = ext->seg;
      scmb = (struct sadb_comb *)(sprp + 1);
    }

  ext = pf_key_v2_find_ext (pmsg, SADB_EXT_IDENTITY_SRC);
  if (ext)
    srcident = ext->seg;

  ext = pf_key_v2_find_ext (pmsg, SADB_EXT_IDENTITY_DST);
  if (ext)
    dstident = ext->seg;

  /* Ask the kernel for the matching policy. */
  bzero (&askpolicy_msg, sizeof askpolicy_msg);
  askpolicy_msg.sadb_msg_type = SADB_X_ASKPOLICY;
  askpolicy = pf_key_v2_msg_new (&askpolicy_msg, 0);
  if (!askpolicy)
    goto fail;

  policy.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
  policy.sadb_x_policy_len = sizeof policy / PF_KEY_V2_CHUNK;
  policy.sadb_x_policy_seq = msg->sadb_msg_seq;
  if (pf_key_v2_msg_add (askpolicy, (struct sadb_ext *)&policy, 0) == -1)
    goto fail;

  ret = pf_key_v2_call (askpolicy);
  if (!ret)
    goto fail;

  /* Now we have all the information needed. */

  ext = pf_key_v2_find_ext (ret, SADB_X_EXT_SRC_FLOW);
  if (!ext)
    {
      log_print ("pf_key_v2_acquire: no source flow extension found");
      goto fail;
    }
  sflow = (struct sockaddr *)(((struct sadb_address *)ext->seg) + 1);

  ext = pf_key_v2_find_ext (ret, SADB_X_EXT_DST_FLOW);
  if (!ext)
    {
      log_print ("pf_key_v2_acquire: no destination flow extension found");
      goto fail;
    }
  dflow = (struct sockaddr *)(((struct sadb_address *)ext->seg) + 1);
  ext = pf_key_v2_find_ext (ret, SADB_X_EXT_SRC_MASK);
  if (!ext)
    {
      log_print ("pf_key_v2_acquire: no source mask extension found");
      goto fail;
    }
  smask = (struct sockaddr *)(((struct sadb_address *)ext->seg) + 1);

  ext = pf_key_v2_find_ext (ret, SADB_X_EXT_DST_MASK);
  if (!ext)
    {
      log_print ("pf_key_v2_acquire: no destination mask extension found");
      goto fail;
    }
  dmask = (struct sockaddr *)(((struct sadb_address *)ext->seg) + 1);

  ext = pf_key_v2_find_ext (ret, SADB_X_EXT_FLOW_TYPE);
  if (!ext)
    {
      log_print ("pf_key_v2_acquire: no flow type extension found");
      goto fail;
    }
  sproto = ext->seg;
  tproto = sproto->sadb_protocol_proto;

#ifdef SADB_X_EXT_LOCAL_CREDENTIALS
  cred
    = (struct sadb_x_cred *)pf_key_v2_find_ext (ret,
						SADB_X_EXT_LOCAL_CREDENTIALS);
#endif

#ifdef SADB_X_EXT_LOCAL_AUTH
  sauth = (struct sadb_x_cred *)pf_key_v2_find_ext (ret,
						    SADB_X_EXT_LOCAL_AUTH);
#endif

  bzero (ssflow, sizeof ssflow);
  bzero (sdflow, sizeof sdflow);
  bzero (ssmask, sizeof ssmask);
  bzero (sdmask, sizeof sdmask);

  switch (sflow->sa_family)
    {
    case AF_INET:
      if (inet_ntop (AF_INET, &((struct sockaddr_in *)sflow)->sin_addr, ssflow,
		     ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      sport = ((struct sockaddr_in *)sflow)->sin_port;
      if (inet_ntop (AF_INET, &((struct sockaddr_in *)dflow)->sin_addr, sdflow,
		     ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      dport = ((struct sockaddr_in *)dflow)->sin_port;
      if (inet_ntop (AF_INET, &((struct sockaddr_in *)smask)->sin_addr, ssmask,
		     ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      if (inet_ntop (AF_INET, &((struct sockaddr_in *)dmask)->sin_addr, sdmask,
		     ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      if (((struct sockaddr_in *)smask)->sin_addr.s_addr == INADDR_BROADCAST)
	shostflag = 1;
      if (((struct sockaddr_in *)dmask)->sin_addr.s_addr == INADDR_BROADCAST)
	dhostflag = 1;
      break;

    case AF_INET6:
      if (inet_ntop (AF_INET6, &((struct sockaddr_in6 *)sflow)->sin6_addr,
		     ssflow, ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      sport = ((struct sockaddr_in6 *)sflow)->sin6_port;
      if (inet_ntop (AF_INET6, &((struct sockaddr_in6 *)dflow)->sin6_addr,
		     sdflow, ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      dport = ((struct sockaddr_in6 *)dflow)->sin6_port;
      if (inet_ntop (AF_INET6, &((struct sockaddr_in6 *)smask)->sin6_addr,
		     ssmask, ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      if (inet_ntop (AF_INET6, &((struct sockaddr_in6 *)dmask)->sin6_addr,
		     sdmask, ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      if (IN6_IS_ADDR_FULL (&((struct sockaddr_in6 *)smask)->sin6_addr))
	shostflag = 1;
      if (IN6_IS_ADDR_FULL (&((struct sockaddr_in6 *)dmask)->sin6_addr))
	dhostflag = 1;
      break;
    }

  dstaddr = (struct sockaddr *)(dst + 1);
  bzero (dstbuf, sizeof dstbuf);
  bzero (srcbuf, sizeof srcbuf);

  switch (dstaddr->sa_family)
    {
    case AF_INET:
      if (inet_ntop (AF_INET, &((struct sockaddr_in *)dstaddr)->sin_addr,
		     dstbuf, ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      LOG_DBG ((LOG_SYSDEP, 20, "pf_key_v2_acquire: dst=%s sproto %d", dstbuf,
		msg->sadb_msg_satype));
      break;

    case AF_INET6:
      if (inet_ntop (AF_INET6, &((struct sockaddr_in6 *)dstaddr)->sin6_addr,
		     dstbuf, ADDRESS_MAX) == NULL)
	{
	  log_print ("pf_key_v2_acquire: inet_ntop failed");
	  goto fail;
	}
      LOG_DBG ((LOG_SYSDEP, 20, "pf_key_v2_acquire: dst=%s sproto %d", dstbuf,
		msg->sadb_msg_satype));
      break;
    }

  if (src)
    {
      srcaddr = (struct sockaddr *)(src + 1);

      switch (srcaddr->sa_family)
        {
	case AF_INET:
	  if (inet_ntop (AF_INET, &((struct sockaddr_in *)srcaddr)->sin_addr,
			 srcbuf, ADDRESS_MAX) == NULL)
	    {
	      log_print ("pf_key_v2_acquire: inet_ntop failed");
	      goto fail;
	    }
	  break;

	case AF_INET6:
	  if (inet_ntop (AF_INET6,
			 &((struct sockaddr_in6 *)srcaddr)->sin6_addr, srcbuf,
			 ADDRESS_MAX) == NULL)
	    {
	      log_print ("pf_key_v2_acquire: inet_ntop failed");
	      goto fail;
	    }
	  break;
	}
    }

  /* Insert source ID. */
  if (srcident)
    {
      slen = (srcident->sadb_ident_len * sizeof (u_int64_t))
	- sizeof (struct sadb_ident);
      if (((unsigned char *)(srcident + 1))[slen - 1] != '\0')
	{
	  log_print ("pf_key_v2_acquire: source identity not NUL-terminated");
	  goto fail;
	}

      /* Check for valid type. */
      switch (srcident->sadb_ident_type)
        {
#ifdef SADB_X_IDENTTYPE_CONNECTION
	case SADB_X_IDENTTYPE_CONNECTION:
	  /* XXX */
	  break;
#endif

	case SADB_IDENTTYPE_PREFIX:
	  /* Determine what the address family is. */
	  srcid = memchr (srcident + 1, ':', slen);
	  if (srcid)
	    afamily = AF_INET6;
	  else
	    afamily = AF_INET;

	  srcid = memchr (srcident + 1, '/', slen);
	  if (!srcid)
	    {
	      log_print ("pf_key_v2_acquire: badly formatted PREFIX identity");
	      goto fail;
	    }

	  masklen = atoi (srcid + 1);

	  /* XXX We only support host addresses. */
	  if ((afamily == AF_INET6 && masklen != 128)
	      || (afamily == AF_INET && masklen != 32))
	    {
	      log_print ("pf_key_v2_acquire: non-host address specified in "
			 "source identity (mask length %d), ignoring request",
			 masklen);
	      goto fail;
	    }

	  /* NUL-terminate the PREFIX string at the separator, then dup. */
	  *srcid = '\0';
	  slen = strlen ((char *)(srcident + 1)) + sizeof "ID:Address/";
	  srcid = malloc (slen);
	  if (!srcid)
	    {
	      log_error ("pf_key_v2_acquire: malloc (%d) failed", slen);
	      goto fail;
	    }

	  sprintf (srcid, "ID:Address/%s", (char *)(srcident + 1));

	  /* Set the section if it doesn't already exist. */
	  af = conf_begin ();
	  if (!conf_get_str (srcid, "ID-type"))
	    {
	      if (conf_set (af, srcid, "ID-type",
			    afamily == AF_INET ? "IPV4_ADDR" : "IPV6_ADDR",
			    1, 0)
		  || conf_set (af, srcid, "Refcount", "1", 1, 0)
		  || conf_set (af, srcid, "Address", (char *)(srcident + 1),
			       1, 0))
		{
		  conf_end (af, 0);
		  goto fail;
		}
	    }
	  else
	    pf_key_v2_conf_refinc (af, srcid);
	  conf_end (af, 1);
	  break;

	case SADB_IDENTTYPE_FQDN:
	  prefstring = "FQDN";
	  /* Fall through */
	case SADB_IDENTTYPE_USERFQDN:
	  if (!prefstring)
	    {
	      prefstring = "USER_FQDN";

	      /*
	       * Check whether there is a string following the header;
	       * if no, that there is a user ID (and acquire the login
	       * name). If there is both a string and a user ID, check
	       * that they match.
	       */
	      if ((slen == 0) && (srcident->sadb_ident_id == 0))
	        {
		  log_print ("pf_key_v2_acquire: no user FQDN or ID provided");
		  goto fail;
		}

	      if (srcident->sadb_ident_id)
	        {
		  pwd = getpwuid (srcident->sadb_ident_id);
		  if (!pwd)
		    {
		      log_error ("pf_key_v2_acquire: could not acquire "
				 "username from provided ID %d",
				 srcident->sadb_ident_id);
		      goto fail;
		    }

		  if (slen != 0)
		    if (strcmp (pwd->pw_name, (char *)(srcident + 1)) != 0)
		      {
			log_print ("pf_key_v2_acquire: provided user name and "
				   "ID do not match (%s != %s)",
				   (char *)(srcident + 1), pwd->pw_name);
			/* String has precedence, per RFC 2367. */
		      }
		}
	    }

	  srcid = malloc ((slen ? slen : strlen (pwd->pw_name))
			  + strlen (prefstring) + sizeof "ID:/");
	  if (!srcid)
	    {
	      log_error ("pf_key_v2_acquire: malloc (%d) failed",
			 slen ? slen : strlen (pwd->pw_name)
			 + strlen (prefstring) + sizeof "ID:/");
	      goto fail;
	    }

	  sprintf (srcid, "ID:%s/", prefstring);
	  if (slen != 0)
	    strlcat (srcid + sizeof "ID:/" - 1 + strlen (prefstring),
		     (char *)(srcident + 1),
		     slen + strlen (prefstring) + sizeof "ID:/");
	  else
	    strlcat (srcid + sizeof "ID:/" - 1 + strlen (prefstring),
		     pwd->pw_name, strlen (prefstring) + sizeof "ID:/");
	  pwd = 0;

	  /* Set the section if it doesn't already exist. */
	  af = conf_begin ();
	  if (!conf_get_str (srcid, "ID-type"))
	    {
	      if (conf_set (af, srcid, "ID-type", prefstring, 1, 0)
		  || conf_set (af, srcid, "Refcount", "1", 1, 0)
		  || conf_set (af, srcid, "Name",
			       srcid + sizeof "ID:/" - 1 + strlen (prefstring),
			       1, 0))
		{
		  conf_end (af, 0);
		  goto fail;
		}
	    }
	  else
	    pf_key_v2_conf_refinc (af, srcid);
	  conf_end (af, 1);
	  break;

	default:
	  LOG_DBG ((LOG_SYSDEP, 20,
		    "pf_key_v2_acquire: invalid source ID type %d",
		    srcident->sadb_ident_type));
	  goto fail;
	}

      LOG_DBG ((LOG_SYSDEP, 50,
		"pf_key_v2_acquire: constructed source ID \"%s\"", srcid));
      prefstring = 0;
    }

  /* Insert destination ID. */
  if (dstident)
    {
      slen = (dstident->sadb_ident_len * sizeof (u_int64_t))
	- sizeof (struct sadb_ident);

      /* Check for valid type. */
      switch (dstident->sadb_ident_type)
        {
#ifdef SADB_X_IDENTTYPE_CONNECTION
	case SADB_X_IDENTTYPE_CONNECTION:
	  /* XXX */
	  break;
#endif

	case SADB_IDENTTYPE_PREFIX:
	  /* Determine what the address family is. */
	  dstid = memchr (dstident + 1, ':', slen);
	  if (dstid)
	    afamily = AF_INET6;
	  else
	    afamily = AF_INET;

	  dstid = memchr (dstident + 1, '/', slen);
	  if (!dstid)
	    {
	      log_print ("pf_key_v2_acquire: badly formatted PREFIX identity");
	      goto fail;
	    }

	  masklen = atoi (dstid + 1);

	  /* XXX We only support host addresses. */
	  if ((afamily == AF_INET6 && masklen != 128)
	      || (afamily == AF_INET && masklen != 32))
	    {
	      log_print ("pf_key_v2_acquire: non-host address specified in "
			 "destination identity (mask length %d), ignoring "
			 "request",
			 masklen);
	      goto fail;
	    }

	  /* NUL-terminate the PREFIX string at the separator, then dup. */
	  *dstid = '\0';
	  slen = strlen ((char *)(dstident + 1)) + sizeof "ID:Address/";
	  dstid = malloc (slen);
	  if (!dstid)
	    {
	      log_error ("pf_key_v2_acquire: malloc (%d) failed", slen);
	      goto fail;
	    }

	  sprintf (dstid, "ID:Address/%s", (char *)(dstident + 1));

	  /* Set the section if it doesn't already exist. */
	  af = conf_begin ();
	  if (!conf_get_str (dstid, "ID-type"))
	    {
	      if (conf_set (af, dstid, "ID-type",
			    afamily == AF_INET ? "IPV4_ADDR" : "IPV6_ADDR",
			    1, 0)
		  || conf_set (af, dstid, "Refcount", "1", 1, 0)
		  || conf_set (af, dstid, "Address", (char *)(dstident + 1),
			       1, 0))
		{
		  conf_end (af, 0);
		  goto fail;
		}
	    }
	  else
	    pf_key_v2_conf_refinc (af, dstid);
	  conf_end (af, 1);
	  break;

	case SADB_IDENTTYPE_FQDN:
	  prefstring = "FQDN";
	  /* Fall through */

	case SADB_IDENTTYPE_USERFQDN:
	  if (!prefstring)
	    {
	      prefstring = "USER_FQDN";

	      /*
	       * Check whether there is a string following the header;
	       * if no, that there is a user ID (and acquire the login
	       * name). If there is both a string and a user ID, check
	       * that they match.
	       */
	      if (slen == 0 && dstident->sadb_ident_id == 0)
	        {
		  log_print ("pf_key_v2_acquire: no user FQDN or ID provided");
		  goto fail;
		}

	      if (dstident->sadb_ident_id)
	        {
		  pwd = getpwuid (dstident->sadb_ident_id);
		  if (!pwd)
		    {
		      log_error ("pf_key_v2_acquire: could not acquire "
				 "username from provided ID %d",
				 dstident->sadb_ident_id);
		      goto fail;
		    }

		  if (slen != 0)
		    if (strcmp (pwd->pw_name, (char *)(dstident + 1)) != 0)
		      {
			log_print ("pf_key_v2_acquire: provided user name and "
				   "ID do not match (%s != %s)",
				   (char *)(dstident + 1), pwd->pw_name);
			/* String has precedence, per RF 2367. */
		      }
		}
	    }

	  dstid = malloc ((slen ? slen : strlen (pwd->pw_name))
			  + strlen (prefstring) + sizeof "ID:/");
	  if (!dstid)
	    {
	      log_error ("pf_key_v2_acquire: malloc (%d) failed",
			 slen ? slen : strlen (pwd->pw_name)
			 + strlen (prefstring) + sizeof "ID:/");
	      goto fail;
	    }

	  sprintf (dstid, "ID:%s/", prefstring);
	  if (slen != 0)
	    strlcat (dstid + sizeof "ID:/" - 1 + strlen (prefstring),
		     (char *)(dstident + 1),
		     slen + strlen (prefstring) + sizeof "ID:/");
	  else
	    strlcat (dstid + sizeof "ID:/" - 1 + strlen (prefstring),
		     pwd->pw_name,
		     strlen (prefstring) + sizeof "ID:/");
	  pwd = 0;

	  /* Set the section if it doesn't already exist. */
	  af = conf_begin ();
	  if (!conf_get_str (dstid, "ID-type"))
	    {
	      if (conf_set (af, dstid, "ID-type", prefstring, 1, 0)
		  || conf_set (af, dstid, "Refcount", "1", 1, 0)
		  || conf_set (af, dstid, "Name",
			       dstid + sizeof "ID:/" - 1 + strlen (prefstring),
			       1, 0))
		{
		  conf_end (af, 0);
		  goto fail;
		}
	    }
	  else
	    pf_key_v2_conf_refinc (af, dstid);
	  conf_end (af, 1);
	  break;

	default:
	  LOG_DBG ((LOG_SYSDEP, 20,
		    "pf_key_v2_acquire: invalid destination ID type %d",
		    dstident->sadb_ident_type));
	  goto fail;
	}

      LOG_DBG ((LOG_SYSDEP, 50,
		"pf_key_v2_acquire: constructed destination ID \"%s\"",
		dstid));
    }

  /* Now we've placed the necessary IDs in the configuration space. */

  /* Get a new connection sequence number. */
  for (;; connection_seq++)
    {
      sprintf (conn, "Connection-%u", connection_seq);
      sprintf (configname, "Config-Phase2-%u", connection_seq);

      /* Does it exist ? */
      if (!conf_get_str (conn, "Phase")
	  && !conf_get_str (configname, "Suites"))
	break;
    }

  /*
   * Set the IPsec connection entry. In particular, the following fields:
   * - Phase
   * - ISAKMP-peer
   * - Local-ID/Remote-ID (if provided)
   * - Acquire-ID (sequence number of kernel message, e.g., PF_KEYv2)
   * - Configuration
   *
   * Also set the following section:
   *    [Peer-dstaddr(/srcaddr)(-srcid)(/dstid)]
   * with these fields:
   * - Phase
   * - ID (if provided)
   * - Remote-ID (if provided)
   * - Local-address (if provided)
   * - Address
   * - Configuration (if an entry "ISAKMP-configuration-dstaddr(/srcaddr)"
   *                  exists -- otherwise use the defaults)
   */

  peer = malloc (strlen (dstbuf) + strlen (srcbuf)
                 + (srcid ? strlen (srcid) : 0)
		 + (dstid ? strlen (dstid) : 0) + sizeof "Peer-/-/");
  if (!peer)
    goto fail;

  /*
   * The various cases:
   * - Peer-dstaddr
   * - Peer-dstaddr/srcaddr
   * - Peer-dstaddr/srcaddr-srcid
   * - Peer-dstaddr/srcaddr-srcid/dstid
   * - Peer-dstaddr/srcaddr-/dstid
   * - Peer-dstaddr-srcid/dstid
   * - Peer-dstaddr-/dstid
   * - Peer-dstaddr-srcid
   */
  sprintf (peer, "Peer-%s%s%s%s%s%s%s", dstbuf, srcaddr ? "/" : "",
	   srcaddr ? srcbuf : "", srcid ? "-" : "", srcid ? srcid : "",
	   dstid ? (srcid ? "/" : "-/") : "", dstid ? dstid : "");

  /*
   * Set the IPsec connection section. Refcount is set to 2, because
   * it will be linked both to the incoming and the outgoing SA.
   */
  af = conf_begin ();
  if (conf_set (af, conn, "Phase", "2", 0, 0)
      || conf_set (af, conn, "Flags", "__ondemand", 0 , 0)
      || conf_set (af, conn, "Refcount", "2", 0 , 0)
      || conf_set (af, conn, "ISAKMP-peer", peer, 0, 0))
    {
      conf_end (af, 0);
      goto fail;
    }

  /* Set the sequence number. */
  sprintf (lname, "%u", msg->sadb_msg_seq);
  if (conf_set (af, conn, "Acquire-ID", lname, 0, 0))
    {
      conf_end (af, 0);
      goto fail;
    }

  /* Set Phase 2 IDs -- this is the Local-ID section. */
  sprintf (lname, "Phase2-ID:%s/%s/%u/%u", ssflow, ssmask, tproto, sport);
  if (conf_set (af, conn, "Local-ID", lname, 0, 0))
    {
      conf_end (af, 0);
      goto fail;
    }

  if (!conf_get_str (lname, "ID-type"))
    {
      if (conf_set (af, lname, "Refcount", "1", 0, 0))
	{
	  conf_end (af, 0);
	  goto fail;
	}

      if (shostflag)
        {
	  if (conf_set (af, lname, "ID-type", "IPV4_ADDR", 0, 0)
	      || conf_set (af, lname, "Address", ssflow, 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }
	}
      else
        {
	  if (conf_set (af, lname, "ID-type", "IPV4_ADDR_SUBNET", 0, 0)
	      || conf_set (af, lname, "Network", ssflow, 0, 0)
	      || conf_set (af, lname, "Netmask", ssmask, 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }
	}
      if (tproto)
        {
	  sprintf (tmbuf, "%u", tproto);
	  if (conf_set (af, lname, "Protocol", tmbuf, 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }

	  if (sport)
	    {
	      sprintf (tmbuf, "%u", ntohs (sport));
	      if (conf_set (af, lname, "Port", tmbuf, 0, 0))
	        {
		  conf_end (af, 0);
		  goto fail;
		}
	    }
	}
    }
  else
    pf_key_v2_conf_refinc (af, lname);

  /* Set Remote-ID section. */
  sprintf (dname, "Phase2-ID:%s/%s/%u/%u", sdflow, sdmask, tproto, dport);
  if (conf_set (af, conn, "Remote-ID", dname, 0, 0))
    {
      conf_end (af, 0);
      goto fail;
    }

  if (!conf_get_str (dname, "ID-type"))
    {
      if (conf_set (af, dname, "Refcount", "1", 0, 0))
	{
	  conf_end (af, 0);
	  goto fail;
	}

      if (dhostflag)
        {
	  if (conf_set (af, dname, "ID-type", "IPV4_ADDR", 0, 0)
	      || conf_set (af, dname, "Address", sdflow, 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }
	}
      else
        {
	  if (conf_set (af, dname, "ID-type", "IPV4_ADDR_SUBNET", 0, 0)
	      || conf_set (af, dname, "Network", sdflow, 0, 0)
	      || conf_set (af, dname, "Netmask", sdmask, 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }
	}

      if (tproto)
        {
	  sprintf (tmbuf, "%u", tproto);
	  if (conf_set (af, dname, "Protocol", tmbuf, 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }

	  if (dport)
	    {
	      sprintf (tmbuf, "%u", ntohs (dport));
	      if (conf_set (af, dname, "Port", tmbuf, 0, 0))
	        {
		  conf_end (af, 0);
		  goto fail;
		}
	    }
	}
    }
  else
    pf_key_v2_conf_refinc (af, dname);

  /*
   * XXX
   * We should be using information from the proposal to set this up.
   * At least, we should make this selectable.
   */

  /* Phase 2 configuration. */
  if (conf_set (af, conn, "Configuration", configname, 0, 0))
    {
      conf_end (af, 0);
      goto fail;
    }

  if (conf_set (af, configname, "Exchange_type", "Quick_mode", 0, 0)
      || conf_set (af, configname, "DOI", "IPSEC", 0, 0))
    {
      conf_end (af, 0);
      goto fail;
    }

  if (conf_get_str ("General", "Default-Phase-2-Suites"))
    {
      if (conf_set (af, configname, "Suites",
		    conf_get_str ("General", "Default-Phase-2-Suites"), 0, 0))
        {
	  conf_end (af, 0);
	  goto fail;
	}
    }
  else
    {
      if (conf_set (af, configname, "Suites",
		    "QM-ESP-3DES-SHA-PFS-SUITE", 0, 0))
        {
	  conf_end (af, 0);
	  goto fail;
	}
    }

  /* Set the ISAKMP-peer section. */
  if (!conf_get_str (peer, "Phase"))
    {
      if (conf_set (af, peer, "Phase", "1", 0, 0)
	  || conf_set (af, peer, "Refcount", "1", 0, 0)
	  || conf_set (af, peer, "Address", dstbuf, 0, 0))
        {
	  conf_end (af, 0);
	  goto fail;
        }

      if (srcaddr && conf_set (af, peer, "Local-address", srcbuf, 0, 0))
	{
	  conf_end (af, 0);
	  goto fail;
	}

      sprintf (confname, "ISAKMP-Configuration-%s", peer);
      if (conf_set (af, peer, "Configuration", confname, 0, 0))
        {
	  conf_end (af, 0);
	  goto fail;
	}

#ifdef SADB_X_CREDTYPE_NONE
      /* Store any credentials passed to us. */
      if (cred)
	{
	  struct cert_handler *handler = 0;
	  void *cert;
	  char num[10], *certprint;

	  /* Convert to bytes in-place. */
	  cred->sadb_x_cred_len *= PF_KEY_V2_CHUNK;

	  if (cred->sadb_x_cred_len <= sizeof *cred)
	    {
	      log_print ("pf_key_v2_set_spi: zero-length credentials, "
			 "aborting SA acquisition");
	      conf_end (af, 0);
	      goto fail;
	    }

	  switch (cred->sadb_x_cred_type)
	    {
	    case SADB_X_CREDTYPE_X509:
	      sprintf (num, "%d", ISAKMP_CERTENC_X509_SIG);
	      handler = cert_get (ISAKMP_CERTENC_X509_SIG);
	      break;
	    case SADB_X_CREDTYPE_KEYNOTE:
	      sprintf (num, "%d", ISAKMP_CERTENC_KEYNOTE);
	      handler = cert_get (ISAKMP_CERTENC_KEYNOTE);
	      break;
	    default:
	      log_print ("pf_key_v2_set_spi: unknown credential type %d",
			 cred->sadb_x_cred_type);
	      conf_end (af, 0);
	      goto fail;
	    }

	  if (!handler)
	    {
	      log_print ("pf_key_v2_set_spi: cert_get (%s) failed", num);
	      conf_end (af, 0);
	      goto fail;
	    }

	  /* Set the credential type as a number. */
	  if (conf_set (af, peer, "Credential_type", num, 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }

	  /* Get the certificate. */
	  cert = handler->cert_get ((u_int8_t *)(cred + 1),
				    cred->sadb_x_cred_len - sizeof *cred);

	  /* Now convert to printable format. */
	  certprint = handler->cert_printable (cert);
	  handler->cert_free (cert);
	  if (!certprint
	      || conf_set (af, peer, "Credentials", certprint, 0, 0))
	    {
	      if (certprint)
		free (certprint);
	      conf_end (af, 0);
	      goto fail;
	    }
	  free (certprint);
	}
#endif /* SADB_X_CREDTYPE_NONE */

      /* Phase 1 configuration. */
      if (!conf_get_str (confname, "exchange_type"))
        {
#ifdef SADB_X_CREDTYPE_NONE
	  /* We may have been provided with authentication material. */
	  if (sauth)
	    {
	      u_int8_t *authm;

	      /* Convert to bytes in-place. */
	      sauth->sadb_x_cred_len *= PF_KEY_V2_CHUNK;

	      switch (sauth->sadb_x_cred_type)
		{
		case SADB_X_AUTHTYPE_PASSPHRASE:
		  if (conf_set (af, confname, "Transforms", "3DES-SHA", 0, 0))
		    {
		      conf_end (af, 0);
		      goto fail;
		    }

		  if (sauth->sadb_x_cred_len <= sizeof *sauth)
		    {
		      log_print ("pf_key_v2_set_spi: zero-length passphrase, "
				 "aborting SA acquisition");
		      conf_end (af, 0);
		      goto fail;
		    }

		  authm = malloc (sauth->sadb_x_cred_len - sizeof *sauth + 1);
		  if (!authm)
		    {
		      log_error ("pf_key_v2_set_spi: malloc (%d) failed",
				 sauth->sadb_x_cred_len - sizeof *sauth + 1);
		      conf_end (af, 0);
		      goto fail;
		    }
		  memcpy (authm, sauth + 1,
			  sauth->sadb_x_cred_len - sizeof *sauth + 1);

		  /* Set the passphrase in the peer. */
		  if (conf_set (af, peer, "Authentication", authm, 0, 0))
		    {
		      free (authm);
		      conf_end (af, 0);
		      goto fail;
		    }
		  free (authm);
		  break;

		case SADB_X_AUTHTYPE_RSA:
		  if (conf_set (af, confname, "Transforms", "3DES-SHA-RSA_SIG",
				0, 0))
		    {
		      conf_end (af, 0);
		      goto fail;
		    }

		  if (sauth->sadb_x_cred_len <= sizeof *sauth)
		    {
		      log_print ("pf_key_v2_set_spi: zero-length RSA key, "
				 "aborting SA acquisition");
		      conf_end (af, 0);
		      goto fail;
		    }

		  authm = key_printable (ISAKMP_KEY_RSA,
					 ISAKMP_KEYTYPE_PRIVATE,
					 (u_int8_t *) sauth + 1,
					 sauth->sadb_x_cred_len
					 - sizeof *sauth);
		  if (!authm)
		    {
		      log_print ("pf_key_v2_set_spi: failed to convert "
				 "private key to printable format (size %d)",
				 sauth->sadb_x_cred_len - sizeof *sauth);
		      conf_end (af, 0);
		      goto fail;
		    }

		  /*
		   * Set the key in the peer. We don't use "Authentication"
		   * to avoid potential conflicts with file-based
		   * configurations that use public key authentication
		   * but still specify an "Authentication" tag (typically
		   * as a remnant of passphrase-based testing).
		   */
		  if (conf_set (af, peer, "PKAuthentication", authm, 0, 0))
		    {
		      free (authm);
		      conf_end (af, 0);
		      goto fail;
		    }
		  free (authm);
		  break;

		default:
		  log_print ("pf_key_v2_set_spi: unknown authentication "
			     "material type %d received from kernel",
			     sauth->sadb_x_cred_type);
		  conf_end (af, 0);
		  goto fail;
		}
	    }
	  else /* Fall through */
#endif /* SADB_X_CREDTYPE_NONE */
	  /* XXX Default transform set should be settable. */
	  if (conf_set (af, confname, "Transforms", "3DES-SHA-RSA_SIG", 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }

	  if (conf_set (af, confname, "Exchange_Type", "ID_PROT", 0, 0)
	      || conf_set (af, confname, "DOI", "IPSEC", 0, 0)
	      || conf_set (af, confname, "Refcount", "1", 0, 0))
	    {
	      conf_end (af, 0);
	      goto fail;
	    }
	}
      else
	pf_key_v2_conf_refinc (af, confname);

      /* The ID we should use in Phase 1. */
      if (srcid && conf_set (af, peer, "ID", srcid, 0, 0))
	  {
	    conf_end (af, 0);
	    goto fail;
	  }

      /* The ID the other side should use in Phase 1. */
      if (dstid && conf_set (af, peer, "Remote-ID", dstid, 0, 0))
	{
	  conf_end (af, 0);
	  goto fail;
	}
    }
  else
    pf_key_v2_conf_refinc (af, peer);

  /* All done. */
  conf_end (af, 1);

  /* Let's rock 'n roll. */
  pf_key_v2_connection_check (conn);
  conn = 0;

  /* Fall-through to cleanup. */
 fail:
  if (ret)
    pf_key_v2_msg_free (ret);
  if (askpolicy)
    pf_key_v2_msg_free (askpolicy);
  if (srcid)
    free (srcid);
  if (dstid)
    free (dstid);
  if (peer)
    free (peer);
  if (conn)
    free (conn);
  return;
#endif
}

static void
pf_key_v2_notify (struct pf_key_v2_msg *msg)
{
  switch (((struct sadb_msg *)TAILQ_FIRST (msg)->seg)->sadb_msg_type)
    {
    case SADB_EXPIRE:
      pf_key_v2_expire (msg);
      break;

    case SADB_ACQUIRE:
      pf_key_v2_acquire (msg);
      break;

    default:
      log_print ("pf_key_v2_notify: unexpected message type (%d)",
		 ((struct sadb_msg *)TAILQ_FIRST (msg)->seg)->sadb_msg_type);
    }
  pf_key_v2_msg_free (msg);
}

void
pf_key_v2_handler (int fd)
{
  struct pf_key_v2_msg *msg;
  int n;

  /*
   * As synchronous read/writes to the socket can have taken place between
   * the select(2) call of the main loop and this handler, we need to recheck
   * the readability.
   */
  if (ioctl (pf_key_v2_socket, FIONREAD, &n) == -1)
    {
      log_error ("pf_key_v2_handler: ioctl (%d, FIONREAD, &n) failed",
		 pf_key_v2_socket);
      return;
    }
  if (!n)
    return;

  msg = pf_key_v2_read (0);
  if (msg)
    pf_key_v2_notify (msg);
}

/*
 * Group 2 IPsec SAs given by the PROTO1 and PROTO2 protocols of the SA IKE
 * security association in a chain.
 * XXX Assumes OpenBSD GRPSPIS extension.  Should probably be moved to sysdep.c
 */
int
pf_key_v2_group_spis (struct sa *sa, struct proto *proto1,
		      struct proto *proto2, int incoming)
{
#ifdef SADB_X_GRPSPIS
  struct sadb_msg msg;
  struct sadb_sa sa1, sa2;
  struct sadb_address *addr = 0;
  struct sadb_protocol protocol;
  struct pf_key_v2_msg *grpspis = 0, *ret = 0;
  struct sockaddr *saddr;
  int err;
  size_t len;
#ifdef KAME
  struct sadb_x_sa2 kamesa2;
#endif

  msg.sadb_msg_type = SADB_X_GRPSPIS;
  switch (proto1->proto)
    {
    case IPSEC_PROTO_IPSEC_ESP:
      msg.sadb_msg_satype = SADB_SATYPE_ESP;
      break;
    case IPSEC_PROTO_IPSEC_AH:
      msg.sadb_msg_satype = SADB_SATYPE_AH;
      break;
#ifdef SADB_X_SATYPE_IPCOMP
    case IPSEC_PROTO_IPCOMP:
      msg.sadb_msg_satype = SADB_X_SATYPE_IPCOMP;
      break;
#endif
    default:
      log_print ("pf_key_v2_group_spis: invalid proto %d", proto1->proto);
      goto cleanup;
    }
  msg.sadb_msg_seq = 0;
  grpspis = pf_key_v2_msg_new (&msg, 0);
  if (!grpspis)
    goto cleanup;

  /* Setup the SA extensions.  */
  sa1.sadb_sa_exttype = SADB_EXT_SA;
  sa1.sadb_sa_len = sizeof sa1 / PF_KEY_V2_CHUNK;
  memcpy (&sa1.sadb_sa_spi, proto1->spi[incoming], sizeof sa1.sadb_sa_spi);
  sa1.sadb_sa_replay = 0;
  sa1.sadb_sa_state = 0;
  sa1.sadb_sa_auth = 0;
  sa1.sadb_sa_encrypt = 0;
  sa1.sadb_sa_flags = 0;
  if (pf_key_v2_msg_add (grpspis, (struct sadb_ext *)&sa1, 0) == -1)
    goto cleanup;

#ifndef KAME
  sa2.sadb_sa_exttype = SADB_X_EXT_SA2;
  sa2.sadb_sa_len = sizeof sa2 / PF_KEY_V2_CHUNK;
  memcpy (&sa2.sadb_sa_spi, proto2->spi[incoming], sizeof sa2.sadb_sa_spi);
  sa2.sadb_sa_replay = 0;
  sa2.sadb_sa_state = 0;
  sa2.sadb_sa_auth = 0;
  sa2.sadb_sa_encrypt = 0;
  sa2.sadb_sa_flags = 0;
  if (pf_key_v2_msg_add (grpspis, (struct sadb_ext *)&sa2, 0) == -1)
    goto cleanup;
#else
  memset (&kamesa2, 0, sizeof kamesa2);
  kamesa2.sadb_x_sa2_exttype = SADB_X_EXT_SA2;
  kamesa2.sadb_x_sa2_len = sizeof kamesa2 / PF_KEY_V2_CHUNK;
  kamesa2.sadb_x_sa2_mode = 0;
  if (pf_key_v2_msg_add (grpspis, (struct sadb_ext *)&kamesa2, 0) == -1)
    goto cleanup;
#endif

  /*
   * Setup the ADDRESS extensions.
   */
  if (incoming)
    sa->transport->vtbl->get_src (sa->transport, &saddr);
  else
    sa->transport->vtbl->get_dst (sa->transport, &saddr);
  len = sizeof *addr + PF_KEY_V2_ROUND (sysdep_sa_len (saddr));
  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
  addr->sadb_address_proto = 0;
  addr->sadb_address_prefixlen = 0;
#endif
  addr->sadb_address_reserved = 0;
  memcpy (addr + 1, saddr, sysdep_sa_len (saddr));
  ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
  if (pf_key_v2_msg_add (grpspis, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  addr = calloc (1, len);
  if (!addr)
    goto cleanup;
  addr->sadb_address_exttype = SADB_X_EXT_DST2;
  addr->sadb_address_len = len / PF_KEY_V2_CHUNK;
#ifndef __OpenBSD__
  addr->sadb_address_proto = 0;
  addr->sadb_address_prefixlen = 0;
#endif
  addr->sadb_address_reserved = 0;
  memcpy (addr + 1, saddr, sysdep_sa_len (saddr));
  ((struct sockaddr_in *)(addr + 1))->sin_port = 0;
  if (pf_key_v2_msg_add (grpspis, (struct sadb_ext *)addr,
			 PF_KEY_V2_NODE_MALLOCED) == -1)
    goto cleanup;
  addr = 0;

  /* Setup the PROTOCOL extension.  */
  protocol.sadb_protocol_exttype = SADB_X_EXT_PROTOCOL;
  protocol.sadb_protocol_len = sizeof protocol / PF_KEY_V2_CHUNK;
  switch (proto2->proto)
    {
    case IPSEC_PROTO_IPSEC_ESP:
      protocol.sadb_protocol_proto = SADB_SATYPE_ESP;
      break;
    case IPSEC_PROTO_IPSEC_AH:
      protocol.sadb_protocol_proto = SADB_SATYPE_AH;
      break;
#ifdef SADB_X_SATYPE_IPCOMP
    case IPSEC_PROTO_IPCOMP:
      protocol.sadb_protocol_proto = SADB_X_SATYPE_IPCOMP;
      break;
#endif
    default:
      log_print ("pf_key_v2_group_spis: invalid proto %d", proto2->proto);
      goto cleanup;
    }
  protocol.sadb_protocol_reserved2 = 0;
  if (pf_key_v2_msg_add (grpspis, (struct sadb_ext *)&protocol, 0) == -1)
    goto cleanup;

  ret = pf_key_v2_call (grpspis);
  pf_key_v2_msg_free (grpspis);
  grpspis = 0;
  if (!ret)
    goto cleanup;
  err = ((struct sadb_msg *)TAILQ_FIRST (ret)->seg)->sadb_msg_errno;
  if (err)
    {
      log_print ("pf_key_v2_group_spis: GRPSPIS: %s", strerror (err));
      goto cleanup;
    }
  pf_key_v2_msg_free (ret);

  LOG_DBG ((LOG_SYSDEP, 50, "pf_key_v2_group_spis: done"));

  return 0;

 cleanup:
  if (addr)
     free (addr);
  if (grpspis)
    pf_key_v2_msg_free (grpspis);
  if (ret)
    pf_key_v2_msg_free (ret);
  return -1;

#else
  log_print ("pf_key_v2_group_spis: not supported in pure PF_KEYv2");
  return -1;
#endif
}