/*	$NetBSD: isakmp_quick.c,v 1.29 2011/03/14 17:18:13 tteras Exp $	*/

/* Id: isakmp_quick.c,v 1.29 2006/08/22 18:17:17 manubsd Exp */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>

#include <netinet/in.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#include PATH_IPSEC_H

#include "var.h"
#include "vmbuf.h"
#include "schedule.h"
#include "misc.h"
#include "plog.h"
#include "debug.h"

#include "localconf.h"
#include "remoteconf.h"
#include "handler.h"
#include "policy.h"
#include "proposal.h"
#include "isakmp_var.h"
#include "isakmp.h"
#include "isakmp_inf.h"
#include "isakmp_quick.h"
#include "oakley.h"
#include "ipsec_doi.h"
#include "crypto_openssl.h"
#include "pfkey.h"
#include "policy.h"
#include "algorithm.h"
#include "sockmisc.h"
#include "proposal.h"
#include "sainfo.h"
#include "admin.h"
#include "strnames.h"

#ifdef ENABLE_HYBRID
#include <resolv.h>
#include "isakmp_xauth.h"
#include "isakmp_cfg.h"
#endif

#ifdef ENABLE_NATT
#include "nattraversal.h"
#endif

/* quick mode */
static vchar_t *quick_ir1mx __P((struct ph2handle *, vchar_t *, vchar_t *));
static int get_sainfo_r __P((struct ph2handle *));
static int get_proposal_r __P((struct ph2handle *));
static int ph2_recv_n __P((struct ph2handle *, struct isakmp_gen *));
static void quick_timeover_stub __P((struct sched *));
static void quick_timeover __P((struct ph2handle *));

/* called from scheduler */
static void
quick_timeover_stub(p)
	struct sched *p;
{
	quick_timeover(container_of(p, struct ph2handle, sce));
}

static void
quick_timeover(iph2)
	struct ph2handle *iph2;
{
	plog(LLV_ERROR, LOCATION, NULL,
		"%s give up to get IPsec-SA due to time up to wait.\n",
		saddrwop2str(iph2->dst));

	/* If initiator side, send error to kernel by SADB_ACQUIRE. */
	if (iph2->side == INITIATOR)
		pk_sendeacquire(iph2);

	remph2(iph2);
	delph2(iph2);
}

/* %%%
 * Quick Mode
 */
/*
 * begin Quick Mode as initiator.  send pfkey getspi message to kernel.
 */
int
quick_i1prep(iph2, msg)
	struct ph2handle *iph2;
	vchar_t *msg; /* must be null pointer */
{
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_STATUS2) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	iph2->msgid = isakmp_newmsgid2(iph2->ph1);
	iph2->ivm = oakley_newiv2(iph2->ph1, iph2->msgid);
	if (iph2->ivm == NULL)
		return 0;

	iph2->status = PHASE2ST_GETSPISENT;

	/* don't anything if local test mode. */
	if (f_local) {
		error = 0;
		goto end;
	}

	/* send getspi message */
	if (pk_sendgetspi(iph2) < 0)
		goto end;

	plog(LLV_DEBUG, LOCATION, NULL, "pfkey getspi sent.\n");

	sched_schedule(&iph2->sce, lcconf->wait_ph2complete,
		       quick_timeover_stub);

	error = 0;

end:
	return error;
}

/*
 * send to responder
 * 	HDR*, HASH(1), SA, Ni [, KE ] [, IDi2, IDr2 ] [, NAT-OAi, NAT-OAr ]
 */
int
quick_i1send(iph2, msg)
	struct ph2handle *iph2;
	vchar_t *msg; /* must be null pointer */
{
	vchar_t *body = NULL;
	vchar_t *hash = NULL;
	struct isakmp_gen *gen;
	char *p;
	int tlen;
	int error = ISAKMP_INTERNAL_ERROR;
	int natoa = ISAKMP_NPTYPE_NONE;
	int pfsgroup, idci, idcr;
	int np;
	struct ipsecdoi_id_b *id, *id_p;
#ifdef ENABLE_NATT
	vchar_t *nat_oai = NULL;
	vchar_t *nat_oar = NULL;
#endif

	/* validity check */
	if (msg != NULL) {
		plog(LLV_ERROR, LOCATION, NULL,
			"msg has to be NULL in this function.\n");
		goto end;
	}
	if (iph2->status != PHASE2ST_GETSPIDONE) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* create SA payload for my proposal */
	if (ipsecdoi_setph2proposal(iph2) < 0)
		goto end;

	/* generate NONCE value */
	iph2->nonce = eay_set_random(iph2->ph1->rmconf->nonce_size);
	if (iph2->nonce == NULL)
		goto end;

	/*
	 * DH value calculation is kicked out into cfparse.y.
	 * because pfs group can not be negotiated, it's only to be checked
	 * acceptable.
	 */
	/* generate KE value if need */
	pfsgroup = iph2->proposal->pfs_group;
	if (pfsgroup) {
		/* DH group settting if PFS is required. */
		if (oakley_setdhgroup(pfsgroup, &iph2->pfsgrp) < 0) {
			plog(LLV_ERROR, LOCATION, NULL,
				"failed to set DH value.\n");
			goto end;
		}
		if (oakley_dh_generate(iph2->pfsgrp,
				&iph2->dhpub, &iph2->dhpriv) < 0) {
			goto end;
		}
	}

	/* generate ID value */
	if (ipsecdoi_setid2(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get ID.\n");
		goto end;
	}
	plog(LLV_DEBUG, LOCATION, NULL, "IDci:\n");
	plogdump(LLV_DEBUG, iph2->id->v, iph2->id->l);
	plog(LLV_DEBUG, LOCATION, NULL, "IDcr:\n");
	plogdump(LLV_DEBUG, iph2->id_p->v, iph2->id_p->l);

	/*
	 * we do not attach IDci nor IDcr, under the following condition:
	 * - all proposals are transport mode
	 * - no MIP6 or proxy
	 * - id payload suggests to encrypt all the traffic (no specific
	 *   protocol type)
	 * - SA endpoints and IKE addresses for the nego are the same
	 *   (iph2->src/dst)
	 */
	id = (struct ipsecdoi_id_b *)iph2->id->v;
	id_p = (struct ipsecdoi_id_b *)iph2->id_p->v;
	if (id->proto_id == 0 &&
	    id_p->proto_id == 0 &&
	    iph2->ph1->rmconf->support_proxy == 0 &&
	    iph2->sa_src == NULL && iph2->sa_dst == NULL &&
	    ipsecdoi_transportmode(iph2->proposal)) {
		idci = idcr = 0;
	} else
		idci = idcr = 1;

#ifdef ENABLE_NATT
	/*
	 * RFC3947 5.2. if we propose UDP-Encapsulated-Transport
	 * we should send NAT-OA
	 */
	if (ipsecdoi_transportmode(iph2->proposal)
	 && (iph2->ph1->natt_flags & NAT_DETECTED)) {
		natoa = iph2->ph1->natt_options->payload_nat_oa;

		nat_oai = ipsecdoi_sockaddr2id(iph2->src,
			IPSECDOI_PREFIX_HOST, IPSEC_ULPROTO_ANY);
		nat_oar = ipsecdoi_sockaddr2id(iph2->dst,
			IPSECDOI_PREFIX_HOST, IPSEC_ULPROTO_ANY);

		if (nat_oai == NULL || nat_oar == NULL) {
			plog(LLV_ERROR, LOCATION, NULL,
				"failed to generate NAT-OA payload.\n");
			goto end;
		}

		plog(LLV_DEBUG, LOCATION, NULL, "NAT-OAi:\n");
		plogdump(LLV_DEBUG, nat_oai->v, nat_oai->l);
		plog(LLV_DEBUG, LOCATION, NULL, "NAT-OAr:\n");
		plogdump(LLV_DEBUG, nat_oar->v, nat_oar->l);
	} else {
		natoa = ISAKMP_NPTYPE_NONE;
	}
#endif

	/* create SA;NONCE payload, and KE if need, and IDii, IDir. */
	tlen = + sizeof(*gen) + iph2->sa->l
		+ sizeof(*gen) + iph2->nonce->l;
	if (pfsgroup)
		tlen += (sizeof(*gen) + iph2->dhpub->l);
	if (idci)
		tlen += sizeof(*gen) + iph2->id->l;
	if (idcr)
		tlen += sizeof(*gen) + iph2->id_p->l;
#ifdef ENABLE_NATT
	if (natoa != ISAKMP_NPTYPE_NONE)
		tlen += 2 * sizeof(*gen) + nat_oai->l + nat_oar->l;
#endif

	body = vmalloc(tlen);
	if (body == NULL) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get buffer to send.\n");
		goto end;
	}

	p = body->v;

	/* add SA payload */
	p = set_isakmp_payload(p, iph2->sa, ISAKMP_NPTYPE_NONCE);

	/* add NONCE payload */
	if (pfsgroup)
		np = ISAKMP_NPTYPE_KE;
	else if (idci || idcr)
		np = ISAKMP_NPTYPE_ID;
	else
		np = natoa;
	p = set_isakmp_payload(p, iph2->nonce, np);

	/* add KE payload if need. */
	np = (idci || idcr) ? ISAKMP_NPTYPE_ID : natoa;
	if (pfsgroup)
		p = set_isakmp_payload(p, iph2->dhpub, np);

	/* IDci */
	np = (idcr) ? ISAKMP_NPTYPE_ID : natoa;
	if (idci)
		p = set_isakmp_payload(p, iph2->id, np);

	/* IDcr */
	if (idcr)
		p = set_isakmp_payload(p, iph2->id_p, natoa);

#ifdef ENABLE_NATT
	/* NAT-OA */
	if (natoa != ISAKMP_NPTYPE_NONE) {
		p = set_isakmp_payload(p, nat_oai, natoa);
		p = set_isakmp_payload(p, nat_oar, ISAKMP_NPTYPE_NONE);
	}
#endif

	/* generate HASH(1) */
	hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, body);
	if (hash == NULL)
		goto end;

	/* send isakmp payload */
	iph2->sendbuf = quick_ir1mx(iph2, body, hash);
	if (iph2->sendbuf == NULL)
		goto end;

	/* send the packet, add to the schedule to resend */
	if (isakmp_ph2send(iph2) == -1)
		goto end;

	/* change status of isakmp status entry */
	iph2->status = PHASE2ST_MSG1SENT;

	error = 0;

end:
	if (body != NULL)
		vfree(body);
	if (hash != NULL)
		vfree(hash);
#ifdef ENABLE_NATT
	if (nat_oai != NULL)
		vfree(nat_oai);
	if (nat_oar != NULL)
		vfree(nat_oar);
#endif

	return error;
}

/*
 * receive from responder
 * 	HDR*, HASH(2), SA, Nr [, KE ] [, IDi2, IDr2 ] [, NAT-OAi, NAT-OAr ]
 */
int
quick_i2recv(iph2, msg0)
	struct ph2handle *iph2;
	vchar_t *msg0;
{
	vchar_t *msg = NULL;
	vchar_t *hbuf = NULL;	/* for hash computing. */
	vchar_t *pbuf = NULL;	/* for payload parsing */
	vchar_t *idci = NULL;
	vchar_t *idcr = NULL;
	struct isakmp_parse_t *pa;
	struct isakmp *isakmp = (struct isakmp *)msg0->v;
	struct isakmp_pl_hash *hash = NULL;
	char *p;
	int tlen;
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_MSG1SENT) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* decrypt packet */
	if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"Packet wasn't encrypted.\n");
		goto end;
	}
	msg = oakley_do_decrypt(iph2->ph1, msg0, iph2->ivm->iv, iph2->ivm->ive);
	if (msg == NULL)
		goto end;

	/* create buffer for validating HASH(2) */
	/*
	 * ordering rule:
	 *	1. the first one must be HASH
	 *	2. the second one must be SA (added in isakmp-oakley-05!)
	 *	3. two IDs must be considered as IDci, then IDcr
	 */
	pbuf = isakmp_parse(msg);
	if (pbuf == NULL)
		goto end;
	pa = (struct isakmp_parse_t *)pbuf->v;

	/* HASH payload is fixed postion */
	if (pa->type != ISAKMP_NPTYPE_HASH) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"received invalid next payload type %d, "
			"expecting %d.\n",
			pa->type, ISAKMP_NPTYPE_HASH);
		goto end;
	}
	hash = (struct isakmp_pl_hash *)pa->ptr;
	pa++;

	/*
	 * this restriction was introduced in isakmp-oakley-05.
	 * we do not check this for backward compatibility.
	 * TODO: command line/config file option to enable/disable this code
	 */
	/* HASH payload is fixed postion */
	if (pa->type != ISAKMP_NPTYPE_SA) {
		plog(LLV_WARNING, LOCATION, iph2->ph1->remote,
			"received invalid next payload type %d, "
			"expecting %d.\n",
			pa->type, ISAKMP_NPTYPE_HASH);
	}

	/* allocate buffer for computing HASH(2) */
	tlen = iph2->nonce->l
		+ ntohl(isakmp->len) - sizeof(*isakmp);
	hbuf = vmalloc(tlen);
	if (hbuf == NULL) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get hash buffer.\n");
		goto end;
	}
	p = hbuf->v + iph2->nonce->l;	/* retain the space for Ni_b */

	/*
	 * parse the payloads.
	 * copy non-HASH payloads into hbuf, so that we can validate HASH.
	 */
	iph2->sa_ret = NULL;
	tlen = 0;	/* count payload length except of HASH payload. */
	for (; pa->type; pa++) {

		/* copy to buffer for HASH */
		/* Don't modify the payload */
		memcpy(p, pa->ptr, pa->len);

		switch (pa->type) {
		case ISAKMP_NPTYPE_SA:
			if (iph2->sa_ret != NULL) {
				plog(LLV_ERROR, LOCATION, NULL,
					"Ignored, multiple SA "
					"isn't supported.\n");
				break;
			}
			if (isakmp_p2ph(&iph2->sa_ret, pa->ptr) < 0) {
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"duplicate ISAKMP_NPTYPE_SA.\n");
				goto end;
			}
			break;

		case ISAKMP_NPTYPE_NONCE:
			if (isakmp_p2ph(&iph2->nonce_p, pa->ptr) < 0) {
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"duplicate ISAKMP_NPTYPE_NONCE.\n");
				goto end;
			}
			break;

		case ISAKMP_NPTYPE_KE:
			if (isakmp_p2ph(&iph2->dhpub_p, pa->ptr) < 0) {
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"duplicate ISAKMP_NPTYPE_KE.\n");
				goto end;
			}
			break;

		case ISAKMP_NPTYPE_ID:
			if (idci == NULL) {
				if (isakmp_p2ph(&idci, pa->ptr) < 0)
					goto end;
			} else if (idcr == NULL) {
				if (isakmp_p2ph(&idcr, pa->ptr) < 0)
					goto end;
			} else {
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"too many ISAKMP_NPTYPE_ID payloads.\n");
				goto end;
			}
			break;

		case ISAKMP_NPTYPE_N:
			ph2_recv_n(iph2, pa->ptr);
			break;

#ifdef ENABLE_NATT
		case ISAKMP_NPTYPE_NATOA_DRAFT:
		case ISAKMP_NPTYPE_NATOA_RFC:
		    {
			struct sockaddr_storage addr;
			struct sockaddr *daddr;
			u_int8_t prefix;
			u_int16_t ul_proto;
			vchar_t *vp = NULL;

			if (isakmp_p2ph(&vp, pa->ptr) < 0)
				goto end;

			error = ipsecdoi_id2sockaddr(vp,
					(struct sockaddr *) &addr,
					&prefix, &ul_proto);

			vfree(vp);

			if (error)
				goto end;

			daddr = dupsaddr((struct sockaddr *) &addr);
			if (daddr == NULL)
				goto end;

			if (iph2->natoa_src == NULL)
				iph2->natoa_src = daddr;
			else if (iph2->natoa_dst == NULL)
				iph2->natoa_dst = daddr;
			else {
				racoon_free(daddr);
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"too many ISAKMP_NPTYPE_NATOA payloads.\n");
				goto end;
			}
		    }
			break;
#endif

		default:
			/* don't send information, see ident_r1recv() */
			plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
				"ignore the packet, "
				"received unexpecting payload type %d.\n",
				pa->type);
			goto end;
		}

		p += pa->len;

		/* compute true length of payload. */
		tlen += pa->len;
	}

	/* payload existency check */
	if (hash == NULL || iph2->sa_ret == NULL || iph2->nonce_p == NULL) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"few isakmp message received.\n");
		goto end;
	}

#ifndef ANDROID_PATCHED
	/* identity check */
	if (idci != NULL) {
		struct sockaddr_storage proposed_addr, got_addr;
		u_int8_t proposed_prefix, got_prefix;
		u_int16_t proposed_ulproto, got_ulproto;

		error = ipsecdoi_id2sockaddr(iph2->id,
					(struct sockaddr *) &proposed_addr,
					&proposed_prefix, &proposed_ulproto);
		if (error)
			goto end;

		error = ipsecdoi_id2sockaddr(idci,
					(struct sockaddr *) &got_addr,
					&got_prefix, &got_ulproto);
		if (error)
			goto end;

		if (proposed_prefix != got_prefix
		 || proposed_ulproto != got_ulproto) {
			plog(LLV_DEBUG, LOCATION, NULL,
				"IDci prefix/ulproto does not match proposal.\n");
			error = ISAKMP_NTYPE_ATTRIBUTES_NOT_SUPPORTED;
			goto end;
		}
#ifdef ENABLE_NATT
		set_port(iph2->natoa_src,
			 extract_port((struct sockaddr *) &proposed_addr));
#endif

		if (cmpsaddr((struct sockaddr *) &proposed_addr,
			     (struct sockaddr *) &got_addr) == CMPSADDR_MATCH) {
			plog(LLV_DEBUG, LOCATION, NULL,
				"IDci matches proposal.\n");
#ifdef ENABLE_NATT
		} else if (iph2->natoa_src != NULL
			&& cmpsaddr(iph2->natoa_src,
				    (struct sockaddr *) &got_addr) == 0) {
			plog(LLV_DEBUG, LOCATION, NULL,
				"IDci matches NAT-OAi.\n");
#endif
		} else {
			plog(LLV_ERROR, LOCATION, NULL,
				"mismatched IDci was returned.\n");
			error = ISAKMP_NTYPE_ATTRIBUTES_NOT_SUPPORTED;
			goto end;
		}
	}
	if (idcr != NULL) {
		struct sockaddr_storage proposed_addr, got_addr;
		u_int8_t proposed_prefix, got_prefix;
		u_int16_t proposed_ulproto, got_ulproto;

		error = ipsecdoi_id2sockaddr(iph2->id_p,
					(struct sockaddr *) &proposed_addr,
					&proposed_prefix, &proposed_ulproto);
		if (error)
			goto end;

		error = ipsecdoi_id2sockaddr(idcr,
					(struct sockaddr *) &got_addr,
					&got_prefix, &got_ulproto);
		if (error)
			goto end;

		if (proposed_prefix != got_prefix
		 || proposed_ulproto != got_ulproto) {
			plog(LLV_DEBUG, LOCATION, NULL,
				"IDcr prefix/ulproto does not match proposal.\n");
			error = ISAKMP_NTYPE_ATTRIBUTES_NOT_SUPPORTED;
			goto end;
		}

#ifdef ENABLE_NATT
		set_port(iph2->natoa_dst,
			 extract_port((struct sockaddr *) &proposed_addr));
#endif

		if (cmpsaddr((struct sockaddr *) &proposed_addr,
			     (struct sockaddr *) &got_addr) == CMPSADDR_MATCH) {
			plog(LLV_DEBUG, LOCATION, NULL,
				"IDcr matches proposal.\n");
#ifdef ENABLE_NATT
		} else if (iph2->natoa_dst != NULL
			&& cmpsaddr(iph2->natoa_dst,
				    (struct sockaddr *) &got_addr) == CMPSADDR_MATCH) {
			plog(LLV_DEBUG, LOCATION, NULL,
				"IDcr matches NAT-OAr.\n");
#endif
		} else {
			plog(LLV_ERROR, LOCATION, NULL,
				"mismatched IDcr was returned.\n");
			error = ISAKMP_NTYPE_ATTRIBUTES_NOT_SUPPORTED;
			goto end;
		}
	}
#endif

	/* Fixed buffer for calculating HASH */
	memcpy(hbuf->v, iph2->nonce->v, iph2->nonce->l);
	plog(LLV_DEBUG, LOCATION, NULL,
		"HASH allocated:hbuf->l=%zu actual:tlen=%zu\n",
		hbuf->l, tlen + iph2->nonce->l);
	/* adjust buffer length for HASH */
	hbuf->l = iph2->nonce->l + tlen;

	/* validate HASH(2) */
    {
	char *r_hash;
	vchar_t *my_hash = NULL;
	int result;

	r_hash = (char *)hash + sizeof(*hash);

	plog(LLV_DEBUG, LOCATION, NULL, "HASH(2) received:");
	plogdump(LLV_DEBUG, r_hash, ntohs(hash->h.len) - sizeof(*hash));

	my_hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, hbuf);
	if (my_hash == NULL)
		goto end;

	result = memcmp(my_hash->v, r_hash, my_hash->l);
	vfree(my_hash);

	if (result) {
		plog(LLV_DEBUG, LOCATION, iph2->ph1->remote,
			"HASH(2) mismatch.\n");
		error = ISAKMP_NTYPE_INVALID_HASH_INFORMATION;
		goto end;
	}
    }

	/* validity check SA payload sent from responder */
	if (ipsecdoi_checkph2proposal(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"proposal check failed.\n");
		error = ISAKMP_NTYPE_NO_PROPOSAL_CHOSEN;
		goto end;
	}

	/* change status of isakmp status entry */
	iph2->status = PHASE2ST_STATUS6;

	error = 0;

end:
	if (hbuf)
		vfree(hbuf);
	if (pbuf)
		vfree(pbuf);
	if (msg)
		vfree(msg);
	if (idci)
		vfree(idci);
	if (idcr)
		vfree(idcr);

	if (error) {
		VPTRINIT(iph2->sa_ret);
		VPTRINIT(iph2->nonce_p);
		VPTRINIT(iph2->dhpub_p);
		VPTRINIT(iph2->id);
		VPTRINIT(iph2->id_p);
#ifdef ENABLE_NATT
		if (iph2->natoa_src) {
			racoon_free(iph2->natoa_src);
			iph2->natoa_src = NULL;
		}
		if (iph2->natoa_dst) {
			racoon_free(iph2->natoa_dst);
			iph2->natoa_dst = NULL;
		}
#endif
	}

	return error;
}

/*
 * send to responder
 * 	HDR*, HASH(3)
 */
int
quick_i2send(iph2, msg0)
	struct ph2handle *iph2;
	vchar_t *msg0;
{
	vchar_t *msg = NULL;
	vchar_t *buf = NULL;
	vchar_t *hash = NULL;
	char *p = NULL;
	int tlen;
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_STATUS6) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* generate HASH(3) */
    {
	vchar_t *tmp = NULL;

	plog(LLV_DEBUG, LOCATION, NULL, "HASH(3) generate\n");

	tmp = vmalloc(iph2->nonce->l + iph2->nonce_p->l);
	if (tmp == NULL) { 
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get hash buffer.\n");
		goto end;
	}
	memcpy(tmp->v, iph2->nonce->v, iph2->nonce->l);
	memcpy(tmp->v + iph2->nonce->l, iph2->nonce_p->v, iph2->nonce_p->l);

	hash = oakley_compute_hash3(iph2->ph1, iph2->msgid, tmp);
	vfree(tmp);

	if (hash == NULL)
		goto end;
    }

	/* create buffer for isakmp payload */
	tlen = sizeof(struct isakmp)
		+ sizeof(struct isakmp_gen) + hash->l;
	buf = vmalloc(tlen);
	if (buf == NULL) { 
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get buffer to send.\n");
		goto end;
	}

	/* create isakmp header */
	p = set_isakmp_header2(buf, iph2, ISAKMP_NPTYPE_HASH);
	if (p == NULL)
		goto end;

	/* add HASH(3) payload */
	p = set_isakmp_payload(p, hash, ISAKMP_NPTYPE_NONE);

#ifdef HAVE_PRINT_ISAKMP_C
	isakmp_printpacket(buf, iph2->ph1->local, iph2->ph1->remote, 1);
#endif

	/* encoding */
	iph2->sendbuf = oakley_do_encrypt(iph2->ph1, buf, iph2->ivm->ive, iph2->ivm->iv);
	if (iph2->sendbuf == NULL)
		goto end;

	/* if there is commit bit, need resending */
	if (ISSET(iph2->flags, ISAKMP_FLAG_C)) {
		/* send the packet, add to the schedule to resend */
		if (isakmp_ph2send(iph2) == -1)
			goto end;
	} else {
		/* send the packet */
		if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0)
			goto end;
	}

	/* the sending message is added to the received-list. */
	if (add_recvdpkt(iph2->ph1->remote, iph2->ph1->local,
			iph2->sendbuf, msg0) == -1) {
		plog(LLV_ERROR , LOCATION, NULL,
			"failed to add a response packet to the tree.\n");
		goto end;
	}

	/* compute both of KEYMATs */
	if (oakley_compute_keymat(iph2, INITIATOR) < 0)
		goto end;

	iph2->status = PHASE2ST_ADDSA;

	/* don't anything if local test mode. */
	if (f_local) {
		error = 0;
		goto end;
	}

	/* if there is commit bit don't set up SA now. */
	if (ISSET(iph2->flags, ISAKMP_FLAG_C)) {
		iph2->status = PHASE2ST_COMMIT;
		error = 0;
		goto end;
	}

	/* Do UPDATE for initiator */
	plog(LLV_DEBUG, LOCATION, NULL, "call pk_sendupdate\n");
	if (pk_sendupdate(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, NULL, "pfkey update failed.\n");
		goto end;
	}
	plog(LLV_DEBUG, LOCATION, NULL, "pfkey update sent.\n");

	/* Do ADD for responder */
	if (pk_sendadd(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, NULL, "pfkey add failed.\n");
		goto end;
	}
	plog(LLV_DEBUG, LOCATION, NULL, "pfkey add sent.\n");

	error = 0;

end:
	if (buf != NULL)
		vfree(buf);
	if (msg != NULL)
		vfree(msg);
	if (hash != NULL)
		vfree(hash);

	return error;
}

/*
 * receive from responder
 * 	HDR#*, HASH(4), notify
 */
int
quick_i3recv(iph2, msg0)
	struct ph2handle *iph2;
	vchar_t *msg0;
{
	vchar_t *msg = NULL;
	vchar_t *pbuf = NULL;	/* for payload parsing */
	struct isakmp_parse_t *pa;
	struct isakmp_pl_hash *hash = NULL;
	vchar_t *notify = NULL;
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_COMMIT) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* decrypt packet */
	if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"Packet wasn't encrypted.\n");
		goto end;
	}
	msg = oakley_do_decrypt(iph2->ph1, msg0, iph2->ivm->iv, iph2->ivm->ive);
	if (msg == NULL)
		goto end;

	/* validate the type of next payload */
	pbuf = isakmp_parse(msg);
	if (pbuf == NULL)
		goto end;

	for (pa = (struct isakmp_parse_t *)pbuf->v;
	     pa->type != ISAKMP_NPTYPE_NONE;
	     pa++) {

		switch (pa->type) {
		case ISAKMP_NPTYPE_HASH:
			hash = (struct isakmp_pl_hash *)pa->ptr;
			break;
		case ISAKMP_NPTYPE_N:
			if (notify != NULL) {
				plog(LLV_WARNING, LOCATION, NULL,
				    "Ignoring multiples notifications\n");
				break;
			}
			ph2_recv_n(iph2, pa->ptr);
			notify = vmalloc(pa->len);
			if (notify == NULL) {
				plog(LLV_ERROR, LOCATION, NULL,
					"failed to get notify buffer.\n");
				goto end;
			}
			memcpy(notify->v, pa->ptr, notify->l);
			break;
		default:
			/* don't send information, see ident_r1recv() */
			plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
				"ignore the packet, "
				"received unexpecting payload type %d.\n",
				pa->type);
			goto end;
		}
	}

	/* payload existency check */
	if (hash == NULL) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"few isakmp message received.\n");
		goto end;
	}

	/* validate HASH(4) */
    {
	char *r_hash;
	vchar_t *my_hash = NULL;
	vchar_t *tmp = NULL;
	int result;

	r_hash = (char *)hash + sizeof(*hash);

	plog(LLV_DEBUG, LOCATION, NULL, "HASH(4) validate:");
	plogdump(LLV_DEBUG, r_hash, ntohs(hash->h.len) - sizeof(*hash));

	my_hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, notify);
	vfree(tmp);
	if (my_hash == NULL)
		goto end;

	result = memcmp(my_hash->v, r_hash, my_hash->l);
	vfree(my_hash);

	if (result) {
		plog(LLV_DEBUG, LOCATION, iph2->ph1->remote,
			"HASH(4) mismatch.\n");
		error = ISAKMP_NTYPE_INVALID_HASH_INFORMATION;
		goto end;
	}
    }

	iph2->status = PHASE2ST_ADDSA;
	iph2->flags ^= ISAKMP_FLAG_C;	/* reset bit */

	/* don't anything if local test mode. */
	if (f_local) {
		error = 0;
		goto end;
	}

	/* Do UPDATE for initiator */
	plog(LLV_DEBUG, LOCATION, NULL, "call pk_sendupdate\n");
	if (pk_sendupdate(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, NULL, "pfkey update failed.\n");
		goto end;
	}
	plog(LLV_DEBUG, LOCATION, NULL, "pfkey update sent.\n");

	/* Do ADD for responder */
	if (pk_sendadd(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, NULL, "pfkey add failed.\n");
		goto end;
	}
	plog(LLV_DEBUG, LOCATION, NULL, "pfkey add sent.\n");

	error = 0;

end:
	if (msg != NULL)
		vfree(msg);
	if (pbuf != NULL)
		vfree(pbuf);
	if (notify != NULL)
		vfree(notify);

	return error;
}

/*
 * receive from initiator
 * 	HDR*, HASH(1), SA, Ni [, KE ] [, IDi2, IDr2 ] [, NAT-OAi, NAT-OAr ]
 */
int
quick_r1recv(iph2, msg0)
	struct ph2handle *iph2;
	vchar_t *msg0;
{
	vchar_t *msg = NULL;
	vchar_t *hbuf = NULL;	/* for hash computing. */
	vchar_t *pbuf = NULL;	/* for payload parsing */
	struct isakmp_parse_t *pa;
	struct isakmp *isakmp = (struct isakmp *)msg0->v;
	struct isakmp_pl_hash *hash = NULL;
	char *p;
	int tlen;
	int f_id_order;	/* for ID payload detection */
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_START) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* decrypting */
	if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"Packet wasn't encrypted.\n");
		error = ISAKMP_NTYPE_PAYLOAD_MALFORMED;
		goto end;
	}
	/* decrypt packet */
	msg = oakley_do_decrypt(iph2->ph1, msg0, iph2->ivm->iv, iph2->ivm->ive);
	if (msg == NULL) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"Packet decryption failed.\n");
		goto end;
	}

	/* create buffer for using to validate HASH(1) */
	/*
	 * ordering rule:
	 *	1. the first one must be HASH
	 *	2. the second one must be SA (added in isakmp-oakley-05!)
	 *	3. two IDs must be considered as IDci, then IDcr
	 */
	pbuf = isakmp_parse(msg);
	if (pbuf == NULL)
		goto end;
	pa = (struct isakmp_parse_t *)pbuf->v;

	/* HASH payload is fixed postion */
	if (pa->type != ISAKMP_NPTYPE_HASH) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"received invalid next payload type %d, "
			"expecting %d.\n",
			pa->type, ISAKMP_NPTYPE_HASH);
		error = ISAKMP_NTYPE_BAD_PROPOSAL_SYNTAX;
		goto end;
	}
	hash = (struct isakmp_pl_hash *)pa->ptr;
	pa++;

	/*
	 * this restriction was introduced in isakmp-oakley-05.
	 * we do not check this for backward compatibility.
	 * TODO: command line/config file option to enable/disable this code
	 */
	/* HASH payload is fixed postion */
	if (pa->type != ISAKMP_NPTYPE_SA) {
		plog(LLV_WARNING, LOCATION, iph2->ph1->remote,
			"received invalid next payload type %d, "
			"expecting %d.\n",
			pa->type, ISAKMP_NPTYPE_SA);
		error = ISAKMP_NTYPE_BAD_PROPOSAL_SYNTAX;
	}

	/* allocate buffer for computing HASH(1) */
	tlen = ntohl(isakmp->len) - sizeof(*isakmp);
	hbuf = vmalloc(tlen);
	if (hbuf == NULL) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get hash buffer.\n");
		goto end;
	}
	p = hbuf->v;

	/*
	 * parse the payloads.
	 * copy non-HASH payloads into hbuf, so that we can validate HASH.
	 */
	iph2->sa = NULL;	/* we don't support multi SAs. */
	iph2->nonce_p = NULL;
	iph2->dhpub_p = NULL;
	iph2->id_p = NULL;
	iph2->id = NULL;
	tlen = 0;	/* count payload length except of HASH payload. */

	/*
	 * IDi2 MUST be immediatelly followed by IDr2.  We allowed the
	 * illegal case, but logged.  First ID payload is to be IDi2.
	 * And next ID payload is to be IDr2.
	 */
	f_id_order = 0;

	for (; pa->type; pa++) {

		/* copy to buffer for HASH */
		/* Don't modify the payload */
		memcpy(p, pa->ptr, pa->len);

		if (pa->type != ISAKMP_NPTYPE_ID)
			f_id_order = 0;

		switch (pa->type) {
		case ISAKMP_NPTYPE_SA:
			if (iph2->sa != NULL) {
				plog(LLV_ERROR, LOCATION, NULL,
					"Multi SAs isn't supported.\n");
				goto end;
			}
			if (isakmp_p2ph(&iph2->sa, pa->ptr) < 0) {
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"duplicate ISAKMP_NPTYPE_SA.\n");
				goto end;
			}
			break;

		case ISAKMP_NPTYPE_NONCE:
			if (isakmp_p2ph(&iph2->nonce_p, pa->ptr) < 0) {
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"duplicate ISAKMP_NPTYPE_NONCE.\n");
				goto end;
			}
			break;

		case ISAKMP_NPTYPE_KE:
			if (isakmp_p2ph(&iph2->dhpub_p, pa->ptr) < 0) {
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"duplicate ISAKMP_NPTYPE_KE.\n");
				goto end;
			}
			break;

		case ISAKMP_NPTYPE_ID:
			if (iph2->id_p == NULL) {
				/* for IDci */
				f_id_order++;

				if (isakmp_p2ph(&iph2->id_p, pa->ptr) < 0)
					goto end;

			} else if (iph2->id == NULL) {
				/* for IDcr */
				if (f_id_order == 0) {
					plog(LLV_ERROR, LOCATION, NULL,
						"IDr2 payload is not "
						"immediatelly followed "
						"by IDi2. We allowed.\n");
					/* XXX we allowed in this case. */
				}

				if (isakmp_p2ph(&iph2->id, pa->ptr) < 0)
					goto end;
			} else {
				plog(LLV_ERROR, LOCATION, NULL,
					"received too many ID payloads.\n");
				plogdump(LLV_ERROR, iph2->id->v, iph2->id->l);
				error = ISAKMP_NTYPE_INVALID_ID_INFORMATION;
				goto end;
			}
			break;

		case ISAKMP_NPTYPE_N:
			ph2_recv_n(iph2, pa->ptr);
			break;

#ifdef ENABLE_NATT
		case ISAKMP_NPTYPE_NATOA_DRAFT:
		case ISAKMP_NPTYPE_NATOA_RFC:
		    {
			struct sockaddr_storage addr;
			struct sockaddr *daddr;
			u_int8_t prefix;
			u_int16_t ul_proto;
			vchar_t *vp = NULL;

			if (isakmp_p2ph(&vp, pa->ptr) < 0)
				goto end;

			error = ipsecdoi_id2sockaddr(vp,
					(struct sockaddr *) &addr,
					&prefix, &ul_proto);

			vfree(vp);

			if (error)
				goto end;

			daddr = dupsaddr((struct sockaddr *) &addr);
			if (daddr == NULL)
				goto end;

			if (iph2->natoa_dst == NULL)
				iph2->natoa_dst = daddr;
			else if (iph2->natoa_src == NULL)
				iph2->natoa_src = daddr;
			else {
				racoon_free(daddr);
				plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
					"received too many NAT-OA payloads.\n");
				error = ISAKMP_NTYPE_PAYLOAD_MALFORMED;
				goto end;
			}
		    }
			break;
#endif

		default:
			plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
				"ignore the packet, "
				"received unexpecting payload type %d.\n",
				pa->type);
			error = ISAKMP_NTYPE_PAYLOAD_MALFORMED;
			goto end;
		}

		p += pa->len;

		/* compute true length of payload. */
		tlen += pa->len;
	}

	/* payload existency check */
	if (hash == NULL || iph2->sa == NULL || iph2->nonce_p == NULL) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"few isakmp message received.\n");
		error = ISAKMP_NTYPE_PAYLOAD_MALFORMED;
		goto end;
	}

	if (iph2->id_p) {
		plog(LLV_DEBUG, LOCATION, NULL, "received IDci2:");
		plogdump(LLV_DEBUG, iph2->id_p->v, iph2->id_p->l);
	}
	if (iph2->id) {
		plog(LLV_DEBUG, LOCATION, NULL, "received IDcr2:");
		plogdump(LLV_DEBUG, iph2->id->v, iph2->id->l);
	}

	/* adjust buffer length for HASH */
	hbuf->l = tlen;

	/* validate HASH(1) */
    {
	char *r_hash;
	vchar_t *my_hash = NULL;
	int result;

	r_hash = (caddr_t)hash + sizeof(*hash);

	plog(LLV_DEBUG, LOCATION, NULL, "HASH(1) validate:");
	plogdump(LLV_DEBUG, r_hash, ntohs(hash->h.len) - sizeof(*hash));

	my_hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, hbuf);
	if (my_hash == NULL)
		goto end;

	result = memcmp(my_hash->v, r_hash, my_hash->l);
	vfree(my_hash);

	if (result) {
		plog(LLV_DEBUG, LOCATION, iph2->ph1->remote,
			"HASH(1) mismatch.\n");
		error = ISAKMP_NTYPE_INVALID_HASH_INFORMATION;
		goto end;
	}
    }

	/* get sainfo */
	error = get_sainfo_r(iph2);
	if (error) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get sainfo.\n");
		goto end;
	}


	/* check the existence of ID payload and create responder's proposal */
	error = get_proposal_r(iph2);
	switch (error) {
	case -2:
		/* generate a policy template from peer's proposal */
		if (set_proposal_from_proposal(iph2)) {
			plog(LLV_ERROR, LOCATION, NULL,
				"failed to generate a proposal template "
				"from client's proposal.\n");
			error = ISAKMP_INTERNAL_ERROR;
			goto end;
		}
		/*FALLTHROUGH*/
	case 0:
		/* select single proposal or reject it. */
		if (ipsecdoi_selectph2proposal(iph2) < 0) {
			plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
				"no proposal chosen.\n");
			error = ISAKMP_NTYPE_NO_PROPOSAL_CHOSEN;
			goto end;
		}
		break;
	default:
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get proposal for responder.\n");
		goto end;
	}

	/* check KE and attribute of PFS */
	if (iph2->dhpub_p != NULL && iph2->approval->pfs_group == 0) {
		plog(LLV_ERROR, LOCATION, NULL,
			"no PFS is specified, but peer sends KE.\n");
		error = ISAKMP_NTYPE_NO_PROPOSAL_CHOSEN;
		goto end;
	}
	if (iph2->dhpub_p == NULL && iph2->approval->pfs_group != 0) {
		plog(LLV_ERROR, LOCATION, NULL,
			"PFS is specified, but peer doesn't sends KE.\n");
		error = ISAKMP_NTYPE_NO_PROPOSAL_CHOSEN;
		goto end;
	}

	/*
	 * save the packet from the initiator in order to resend the
	 * responder's first packet against this packet.
	 */
	iph2->msg1 = vdup(msg0);

	/* change status of isakmp status entry */
	iph2->status = PHASE2ST_STATUS2;

	error = 0;

end:
	if (hbuf)
		vfree(hbuf);
	if (msg)
		vfree(msg);
	if (pbuf)
		vfree(pbuf);

	if (error) {
		VPTRINIT(iph2->sa);
		VPTRINIT(iph2->nonce_p);
		VPTRINIT(iph2->dhpub_p);
		VPTRINIT(iph2->id);
		VPTRINIT(iph2->id_p);
#ifdef ENABLE_NATT
		if (iph2->natoa_src) {
			racoon_free(iph2->natoa_src);
			iph2->natoa_src = NULL;
		}
		if (iph2->natoa_dst) {
			racoon_free(iph2->natoa_dst);
			iph2->natoa_dst = NULL;
		}
#endif
	}

	return error;
}

/*
 * call pfkey_getspi.
 */
int
quick_r1prep(iph2, msg)
	struct ph2handle *iph2;
	vchar_t *msg;
{
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_STATUS2) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	iph2->status = PHASE2ST_GETSPISENT;

	/* send getspi message */
	if (pk_sendgetspi(iph2) < 0)
		goto end;

	plog(LLV_DEBUG, LOCATION, NULL, "pfkey getspi sent.\n");

	sched_schedule(&iph2->sce, lcconf->wait_ph2complete,
		       quick_timeover_stub);

	error = 0;

end:
	return error;
}

/*
 * send to initiator
 * 	HDR*, HASH(2), SA, Nr [, KE ] [, IDi2, IDr2 ] [, NAT-OAi, NAT-OAr ]
 */
int
quick_r2send(iph2, msg)
	struct ph2handle *iph2;
	vchar_t *msg;
{
	vchar_t *body = NULL;
	vchar_t *hash = NULL;
	struct isakmp_gen *gen;
	char *p;
	int tlen;
	int error = ISAKMP_INTERNAL_ERROR;
	int natoa = ISAKMP_NPTYPE_NONE;
	int pfsgroup;
	u_int8_t *np_p = NULL;
#ifdef ENABLE_NATT
	vchar_t *nat_oai = NULL;
	vchar_t *nat_oar = NULL;
#endif

	/* validity check */
	if (msg != NULL) {
		plog(LLV_ERROR, LOCATION, NULL,
			"msg has to be NULL in this function.\n");
		goto end;
	}
	if (iph2->status != PHASE2ST_GETSPIDONE) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* update responders SPI */
	if (ipsecdoi_updatespi(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, NULL, "failed to update spi.\n");
		goto end;
	}

	/* generate NONCE value */
	iph2->nonce = eay_set_random(iph2->ph1->rmconf->nonce_size);
	if (iph2->nonce == NULL)
		goto end;

	/* generate KE value if need */
	pfsgroup = iph2->approval->pfs_group;
	if (iph2->dhpub_p != NULL && pfsgroup != 0) {
		/* DH group settting if PFS is required. */
		if (oakley_setdhgroup(pfsgroup, &iph2->pfsgrp) < 0) {
			plog(LLV_ERROR, LOCATION, NULL,
				"failed to set DH value.\n");
			goto end;
		}
		/* generate DH public value */
		if (oakley_dh_generate(iph2->pfsgrp,
				&iph2->dhpub, &iph2->dhpriv) < 0) {
			goto end;
		}
	}

#ifdef ENABLE_NATT
	/*
	 * RFC3947 5.2. if we chose UDP-Encapsulated-Transport
	 * we should send NAT-OA
	 */
	if (ipsecdoi_transportmode(iph2->proposal)
	 && (iph2->ph1->natt_flags & NAT_DETECTED)) {
		natoa = iph2->ph1->natt_options->payload_nat_oa;

		nat_oai = ipsecdoi_sockaddr2id(iph2->dst,
			IPSECDOI_PREFIX_HOST, IPSEC_ULPROTO_ANY);
		nat_oar = ipsecdoi_sockaddr2id(iph2->src,
			IPSECDOI_PREFIX_HOST, IPSEC_ULPROTO_ANY);

		if (nat_oai == NULL || nat_oar == NULL) {
			plog(LLV_ERROR, LOCATION, NULL,
				"failed to generate NAT-OA payload.\n");
			goto end;
		}

		plog(LLV_DEBUG, LOCATION, NULL, "NAT-OAi:\n");
		plogdump(LLV_DEBUG, nat_oai->v, nat_oai->l);
		plog(LLV_DEBUG, LOCATION, NULL, "NAT-OAr:\n");
		plogdump(LLV_DEBUG, nat_oar->v, nat_oar->l);
	}
#endif

	/* create SA;NONCE payload, and KE and ID if need */
	tlen = sizeof(*gen) + iph2->sa_ret->l
		+ sizeof(*gen) + iph2->nonce->l;
	if (iph2->dhpub_p != NULL && pfsgroup != 0)
		tlen += (sizeof(*gen) + iph2->dhpub->l);
	if (iph2->id_p != NULL)
		tlen += (sizeof(*gen) + iph2->id_p->l
			+ sizeof(*gen) + iph2->id->l);
#ifdef ENABLE_NATT
	if (natoa != ISAKMP_NPTYPE_NONE)
		tlen += 2 * sizeof(*gen) + nat_oai->l + nat_oar->l;
#endif

	body = vmalloc(tlen);
	if (body == NULL) { 
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get buffer to send.\n");
		goto end;
	}
	p = body->v;

	/* make SA payload */ 
	p = set_isakmp_payload(body->v, iph2->sa_ret, ISAKMP_NPTYPE_NONCE);

	/* add NONCE payload */
	np_p = &((struct isakmp_gen *)p)->np;	/* XXX */
	p = set_isakmp_payload(p, iph2->nonce,
		(iph2->dhpub_p != NULL && pfsgroup != 0)
				? ISAKMP_NPTYPE_KE
				: (iph2->id_p != NULL
					? ISAKMP_NPTYPE_ID
					: natoa));

	/* add KE payload if need. */
	if (iph2->dhpub_p != NULL && pfsgroup != 0) {
		np_p = &((struct isakmp_gen *)p)->np;	/* XXX */
		p = set_isakmp_payload(p, iph2->dhpub,
			(iph2->id_p == NULL)
				? natoa
				: ISAKMP_NPTYPE_ID);
	}

	/* add ID payloads received. */
	if (iph2->id_p != NULL) {
		/* IDci */
		p = set_isakmp_payload(p, iph2->id_p, ISAKMP_NPTYPE_ID);
		/* IDcr */
		np_p = &((struct isakmp_gen *)p)->np;	/* XXX */
		p = set_isakmp_payload(p, iph2->id, natoa);
	}

#ifdef ENABLE_NATT
	/* NAT-OA */
	if (natoa != ISAKMP_NPTYPE_NONE) {
		p = set_isakmp_payload(p, nat_oai, natoa);
		p = set_isakmp_payload(p, nat_oar, ISAKMP_NPTYPE_NONE);
	}
#endif

	/* add a RESPONDER-LIFETIME notify payload if needed */
    {
	vchar_t *data = NULL;
	struct saprop *pp = iph2->approval;
	struct saproto *pr;

	if (pp->claim & IPSECDOI_ATTR_SA_LD_TYPE_SEC) {
		u_int32_t v = htonl((u_int32_t)pp->lifetime);
		data = isakmp_add_attr_l(data, IPSECDOI_ATTR_SA_LD_TYPE,
					IPSECDOI_ATTR_SA_LD_TYPE_SEC);
		if (!data)
			goto end;
		data = isakmp_add_attr_v(data, IPSECDOI_ATTR_SA_LD,
					(caddr_t)&v, sizeof(v));
		if (!data)
			goto end;
	}
	if (pp->claim & IPSECDOI_ATTR_SA_LD_TYPE_KB) {
		u_int32_t v = htonl((u_int32_t)pp->lifebyte);
		data = isakmp_add_attr_l(data, IPSECDOI_ATTR_SA_LD_TYPE,
					IPSECDOI_ATTR_SA_LD_TYPE_KB);
		if (!data)
			goto end;
		data = isakmp_add_attr_v(data, IPSECDOI_ATTR_SA_LD,
					(caddr_t)&v, sizeof(v));
		if (!data)
			goto end;
	}

	/*
	 * XXX Is there only single RESPONDER-LIFETIME payload in a IKE message
	 * in the case of SA bundle ?
	 */
	if (data) {
		for (pr = pp->head; pr; pr = pr->next) {
			body = isakmp_add_pl_n(body, &np_p,
					ISAKMP_NTYPE_RESPONDER_LIFETIME, pr, data);
			if (!body) {
				vfree(data);
				return error;	/* XXX */
			}
		}
		vfree(data);
	}
    }

	/* generate HASH(2) */
    {
	vchar_t *tmp;

	tmp = vmalloc(iph2->nonce_p->l + body->l);
	if (tmp == NULL) { 
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get hash buffer.\n");
		goto end;
	}
	memcpy(tmp->v, iph2->nonce_p->v, iph2->nonce_p->l);
	memcpy(tmp->v + iph2->nonce_p->l, body->v, body->l);

	hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, tmp);
	vfree(tmp);

	if (hash == NULL)
		goto end;
    }

	/* send isakmp payload */
	iph2->sendbuf = quick_ir1mx(iph2, body, hash);
	if (iph2->sendbuf == NULL)
		goto end;

	/* send the packet, add to the schedule to resend */
	if (isakmp_ph2send(iph2) == -1)
		goto end;

	/* the sending message is added to the received-list. */
	if (add_recvdpkt(iph2->ph1->remote, iph2->ph1->local, iph2->sendbuf, iph2->msg1) == -1) {
		plog(LLV_ERROR , LOCATION, NULL,
			"failed to add a response packet to the tree.\n");
		goto end;
	}

	/* change status of isakmp status entry */
	iph2->status = PHASE2ST_MSG1SENT;

	error = 0;

end:
	if (body != NULL)
		vfree(body);
	if (hash != NULL)
		vfree(hash);
#ifdef ENABLE_NATT
	if (nat_oai != NULL)
		vfree(nat_oai);
	if (nat_oar != NULL)
		vfree(nat_oar);
#endif

	return error;
}

/*
 * receive from initiator
 * 	HDR*, HASH(3)

 */
int
quick_r3recv(iph2, msg0)
	struct ph2handle *iph2;
	vchar_t *msg0;
{
	vchar_t *msg = NULL;
	vchar_t *pbuf = NULL;	/* for payload parsing */
	struct isakmp_parse_t *pa;
	struct isakmp_pl_hash *hash = NULL;
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_MSG1SENT) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* decrypt packet */
	if (!ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E)) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"Packet wasn't encrypted.\n");
		goto end;
	}
	msg = oakley_do_decrypt(iph2->ph1, msg0, iph2->ivm->iv, iph2->ivm->ive);
	if (msg == NULL)
		goto end;

	/* validate the type of next payload */
	pbuf = isakmp_parse(msg);
	if (pbuf == NULL)
		goto end;

	for (pa = (struct isakmp_parse_t *)pbuf->v;
	     pa->type != ISAKMP_NPTYPE_NONE;
	     pa++) {

		switch (pa->type) {
		case ISAKMP_NPTYPE_HASH:
			hash = (struct isakmp_pl_hash *)pa->ptr;
			break;
		case ISAKMP_NPTYPE_N:
			ph2_recv_n(iph2, pa->ptr);
			break;
		default:
			/* don't send information, see ident_r1recv() */
			plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
				"ignore the packet, "
				"received unexpecting payload type %d.\n",
				pa->type);
			goto end;
		}
	}

	/* payload existency check */
	if (hash == NULL) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"few isakmp message received.\n");
		goto end;
	}

	/* validate HASH(3) */
	/* HASH(3) = prf(SKEYID_a, 0 | M-ID | Ni_b | Nr_b) */
    {
	char *r_hash;
	vchar_t *my_hash = NULL;
	vchar_t *tmp = NULL;
	int result;

	r_hash = (char *)hash + sizeof(*hash);

	plog(LLV_DEBUG, LOCATION, NULL, "HASH(3) validate:");
	plogdump(LLV_DEBUG, r_hash, ntohs(hash->h.len) - sizeof(*hash));

	tmp = vmalloc(iph2->nonce_p->l + iph2->nonce->l);
	if (tmp == NULL) { 
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get hash buffer.\n");
		goto end;
	}
	memcpy(tmp->v, iph2->nonce_p->v, iph2->nonce_p->l);
	memcpy(tmp->v + iph2->nonce_p->l, iph2->nonce->v, iph2->nonce->l);

	my_hash = oakley_compute_hash3(iph2->ph1, iph2->msgid, tmp);
	vfree(tmp);
	if (my_hash == NULL)
		goto end;

	result = memcmp(my_hash->v, r_hash, my_hash->l);
	vfree(my_hash);

	if (result) {
		plog(LLV_ERROR, LOCATION, iph2->ph1->remote,
			"HASH(3) mismatch.\n");
		error = ISAKMP_NTYPE_INVALID_HASH_INFORMATION;
		goto end;
	}
    }

	/* if there is commit bit, don't set up SA now. */
	if (ISSET(iph2->flags, ISAKMP_FLAG_C)) {
		iph2->status = PHASE2ST_COMMIT;
	} else
		iph2->status = PHASE2ST_STATUS6;

	error = 0;

end:
	if (pbuf != NULL)
		vfree(pbuf);
	if (msg != NULL)
		vfree(msg);

	return error;
}

/*
 * send to initiator
 * 	HDR#*, HASH(4), notify
 */
int
quick_r3send(iph2, msg0)
	struct ph2handle *iph2;
	vchar_t *msg0;
{
	vchar_t *buf = NULL;
	vchar_t *myhash = NULL;
	struct isakmp_pl_n *n;
	vchar_t *notify = NULL;
	char *p;
	int tlen;
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_COMMIT) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* generate HASH(4) */
	/* XXX What can I do in the case of multiple different SA */
	plog(LLV_DEBUG, LOCATION, NULL, "HASH(4) generate\n");

	/* XXX What should I do if there are multiple SAs ? */
	tlen = sizeof(struct isakmp_pl_n) + iph2->approval->head->spisize;
	notify = vmalloc(tlen);
	if (notify == NULL) { 
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get notify buffer.\n");
		goto end;
	}
	n = (struct isakmp_pl_n *)notify->v;
	n->h.np = ISAKMP_NPTYPE_NONE;
	n->h.len = htons(tlen);
	n->doi = htonl(IPSEC_DOI);
	n->proto_id = iph2->approval->head->proto_id;
	n->spi_size = sizeof(iph2->approval->head->spisize);
	n->type = htons(ISAKMP_NTYPE_CONNECTED);
	memcpy(n + 1, &iph2->approval->head->spi, iph2->approval->head->spisize);

	myhash = oakley_compute_hash1(iph2->ph1, iph2->msgid, notify);
	if (myhash == NULL)
		goto end;

	/* create buffer for isakmp payload */
	tlen = sizeof(struct isakmp)
		+ sizeof(struct isakmp_gen) + myhash->l
		+ notify->l;
	buf = vmalloc(tlen);
	if (buf == NULL) { 
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get buffer to send.\n");
		goto end;
	}

	/* create isakmp header */
	p = set_isakmp_header2(buf, iph2, ISAKMP_NPTYPE_HASH);
	if (p == NULL)
		goto end;

	/* add HASH(4) payload */
	p = set_isakmp_payload(p, myhash, ISAKMP_NPTYPE_N);

	/* add notify payload */
	memcpy(p, notify->v, notify->l);

#ifdef HAVE_PRINT_ISAKMP_C
	isakmp_printpacket(buf, iph2->ph1->local, iph2->ph1->remote, 1);
#endif

	/* encoding */
	iph2->sendbuf = oakley_do_encrypt(iph2->ph1, buf, iph2->ivm->ive, iph2->ivm->iv);
	if (iph2->sendbuf == NULL)
		goto end;

	/* send the packet */
	if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0)
		goto end;

	/* the sending message is added to the received-list. */
	if (add_recvdpkt(iph2->ph1->remote, iph2->ph1->local, iph2->sendbuf, msg0) == -1) {
		plog(LLV_ERROR , LOCATION, NULL,
			"failed to add a response packet to the tree.\n");
		goto end;
	}

	iph2->status = PHASE2ST_COMMIT;

	error = 0;

end:
	if (buf != NULL)
		vfree(buf);
	if (myhash != NULL)
		vfree(myhash);
	if (notify != NULL)
		vfree(notify);

	return error;
}

int
tunnel_mode_prop(p)
	struct saprop *p;
{
	struct saproto *pr;

	for (pr = p->head; pr; pr = pr->next)
		if (pr->encmode == IPSECDOI_ATTR_ENC_MODE_TUNNEL)
			return 1;
	return 0;
}

/*
 * set SA to kernel.
 */
int
quick_r3prep(iph2, msg0)
	struct ph2handle *iph2;
	vchar_t *msg0;
{
	int error = ISAKMP_INTERNAL_ERROR;

	/* validity check */
	if (iph2->status != PHASE2ST_STATUS6) {
		plog(LLV_ERROR, LOCATION, NULL,
			"status mismatched %d.\n", iph2->status);
		goto end;
	}

	/* compute both of KEYMATs */
	if (oakley_compute_keymat(iph2, RESPONDER) < 0)
		goto end;

	iph2->status = PHASE2ST_ADDSA;
	iph2->flags ^= ISAKMP_FLAG_C;	/* reset bit */

	/* don't anything if local test mode. */
	if (f_local) {
		error = 0;
		goto end;
	}

	/* Do UPDATE as responder */
	plog(LLV_DEBUG, LOCATION, NULL, "call pk_sendupdate\n");
	if (pk_sendupdate(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, NULL, "pfkey update failed.\n");
		goto end;
	}
	plog(LLV_DEBUG, LOCATION, NULL, "pfkey update sent.\n");

	/* Do ADD for responder */
	if (pk_sendadd(iph2) < 0) {
		plog(LLV_ERROR, LOCATION, NULL, "pfkey add failed.\n");
		goto end;
	}
	plog(LLV_DEBUG, LOCATION, NULL, "pfkey add sent.\n");

	/*
	 * set policies into SPD if the policy is generated
	 * from peer's policy.
	 */
	if (iph2->spidx_gen) {

		struct policyindex *spidx;
		struct sockaddr_storage addr;
		u_int8_t pref;
		struct sockaddr *src = iph2->src;
		struct sockaddr *dst = iph2->dst;

		/* make inbound policy */
		iph2->src = dst;
		iph2->dst = src;
		if (pk_sendspdupdate2(iph2) < 0) {
			plog(LLV_ERROR, LOCATION, NULL,
				"pfkey spdupdate2(inbound) failed.\n");
			goto end;
		}
		plog(LLV_DEBUG, LOCATION, NULL,
			"pfkey spdupdate2(inbound) sent.\n");

		spidx = (struct policyindex *)iph2->spidx_gen;
#ifdef HAVE_POLICY_FWD
		/* make forward policy if required */
		if (tunnel_mode_prop(iph2->approval)) {
			spidx->dir = IPSEC_DIR_FWD;
			if (pk_sendspdupdate2(iph2) < 0) {
				plog(LLV_ERROR, LOCATION, NULL,
					"pfkey spdupdate2(forward) failed.\n");
				goto end;
			}
			plog(LLV_DEBUG, LOCATION, NULL,
				"pfkey spdupdate2(forward) sent.\n");
		}
#endif

		/* make outbound policy */
		iph2->src = src;
		iph2->dst = dst;
		spidx->dir = IPSEC_DIR_OUTBOUND;
		addr = spidx->src;
		spidx->src = spidx->dst;
		spidx->dst = addr;
		pref = spidx->prefs;
		spidx->prefs = spidx->prefd;
		spidx->prefd = pref;

		if (pk_sendspdupdate2(iph2) < 0) {
			plog(LLV_ERROR, LOCATION, NULL,
				"pfkey spdupdate2(outbound) failed.\n");
			goto end;
		}
		plog(LLV_DEBUG, LOCATION, NULL,
			"pfkey spdupdate2(outbound) sent.\n");

		/* spidx_gen is unnecessary any more */
		delsp_bothdir((struct policyindex *)iph2->spidx_gen);
		racoon_free(iph2->spidx_gen);
		iph2->spidx_gen = NULL;
		iph2->generated_spidx=1;
	}

	error = 0;

end:
	return error;
}

/*
 * create HASH, body (SA, NONCE) payload with isakmp header.
 */
static vchar_t *
quick_ir1mx(iph2, body, hash)
	struct ph2handle *iph2;
	vchar_t *body, *hash;
{
	struct isakmp *isakmp;
	vchar_t *buf = NULL, *new = NULL;
	char *p;
	int tlen;
	struct isakmp_gen *gen;
	int error = ISAKMP_INTERNAL_ERROR;

	/* create buffer for isakmp payload */
	tlen = sizeof(*isakmp)
		+ sizeof(*gen) + hash->l
		+ body->l;
	buf = vmalloc(tlen);
	if (buf == NULL) { 
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get buffer to send.\n");
		goto end;
	}

	/* re-set encryption flag, for serurity. */
	iph2->flags |= ISAKMP_FLAG_E;

	/* set isakmp header */
	p = set_isakmp_header2(buf, iph2, ISAKMP_NPTYPE_HASH);
	if (p == NULL)
		goto end;

	/* add HASH payload */
	/* XXX is next type always SA ? */
	p = set_isakmp_payload(p, hash, ISAKMP_NPTYPE_SA);

	/* add body payload */
	memcpy(p, body->v, body->l);

#ifdef HAVE_PRINT_ISAKMP_C
	isakmp_printpacket(buf, iph2->ph1->local, iph2->ph1->remote, 1);
#endif

	/* encoding */
	new = oakley_do_encrypt(iph2->ph1, buf, iph2->ivm->ive, iph2->ivm->iv);
	
	if (new == NULL)
		goto end;

	vfree(buf);

	buf = new;

	error = 0;

end:
	if (error && buf != NULL) {
		vfree(buf);
		buf = NULL;
	}

	return buf;
}

/*
 * get remote's sainfo.
 * NOTE: this function is for responder.
 */
static int
get_sainfo_r(iph2)
	struct ph2handle *iph2;
{
	vchar_t *idsrc = NULL, *iddst = NULL, *client = NULL;
	int error = ISAKMP_INTERNAL_ERROR;

	if (iph2->id == NULL) {
		idsrc = ipsecdoi_sockaddr2id(iph2->src, IPSECDOI_PREFIX_HOST,
					IPSEC_ULPROTO_ANY);
	} else {
		idsrc = vdup(iph2->id);
	}
	if (idsrc == NULL) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to set ID for source.\n");
		goto end;
	}

	if (iph2->id_p == NULL) {
		iddst = ipsecdoi_sockaddr2id(iph2->dst, IPSECDOI_PREFIX_HOST,
					IPSEC_ULPROTO_ANY);
	} else {
		iddst = vdup(iph2->id_p);
	}
	if (iddst == NULL) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to set ID for destination.\n");
		goto end;
	}

#ifdef ENABLE_HYBRID

	/* clientaddr check : obtain modecfg address */
	if (iph2->ph1->mode_cfg != NULL) {
		if ((iph2->ph1->mode_cfg->flags & ISAKMP_CFG_ADDR4_EXTERN) ||
		    (iph2->ph1->mode_cfg->flags & ISAKMP_CFG_ADDR4_LOCAL)){
			struct sockaddr saddr;
			saddr.sa_family = AF_INET;
#ifndef __linux__
			saddr.sa_len = sizeof(struct sockaddr_in);
#endif
			((struct sockaddr_in *)&saddr)->sin_port = IPSEC_PORT_ANY;
			memcpy(&((struct sockaddr_in *)&saddr)->sin_addr, 
				&iph2->ph1->mode_cfg->addr4, sizeof(struct in_addr));
			client = ipsecdoi_sockaddr2id(&saddr, 32, IPSEC_ULPROTO_ANY);
		}
	}

	/* clientaddr check, fallback to peer address */
	if (client == NULL)
	{
		client = ipsecdoi_sockaddr2id(iph2->dst, IPSECDOI_PREFIX_HOST,
					IPSEC_ULPROTO_ANY);
	}
#endif

	/* obtain a matching sainfo section */
	iph2->sainfo = getsainfo(idsrc, iddst, iph2->ph1->id_p, client, iph2->ph1->rmconf->ph1id);
	if (iph2->sainfo == NULL) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to get sainfo.\n");
		goto end;
	}

#ifdef ENABLE_HYBRID
	/* xauth group inclusion check */
	if (iph2->sainfo->group != NULL)
		if(group_check(iph2->ph1,&iph2->sainfo->group->v,1))
			goto end;
#endif

	plog(LLV_DEBUG, LOCATION, NULL,
		"selected sainfo: %s\n", sainfo2str(iph2->sainfo));

	error = 0;
end:
	if (idsrc)
		vfree(idsrc);
	if (iddst)
		vfree(iddst);
	if (client)
		vfree(client);

	return error;
}

/*
 * Copy both IP addresses in ID payloads into [src,dst]_id if both ID types
 * are IP address and same address family.
 * Then get remote's policy from SPD copied from kernel.
 * If the type of ID payload is address or subnet type, then the index is
 * made from the payload.  If there is no ID payload, or the type of ID
 * payload is NOT address type, then the index is made from the address
 * pair of phase 1.
 * NOTE: This function is only for responder.
 */
static int
get_proposal_r(iph2)
	struct ph2handle *iph2;
{
	struct policyindex spidx;
	struct secpolicy *sp_in, *sp_out;
	int idi2type = 0;	/* switch whether copy IDs into id[src,dst]. */
	int error = ISAKMP_INTERNAL_ERROR;

	/* check the existence of ID payload */
	if ((iph2->id_p != NULL && iph2->id == NULL)
	 || (iph2->id_p == NULL && iph2->id != NULL)) {
		plog(LLV_ERROR, LOCATION, NULL,
			"Both IDs wasn't found in payload.\n");
		return ISAKMP_NTYPE_INVALID_ID_INFORMATION;
	}

	/* make sure if sa_[src, dst] are null. */
	if (iph2->sa_src || iph2->sa_dst) {
		plog(LLV_ERROR, LOCATION, NULL,
			"Why do ID[src,dst] exist already.\n");
		return ISAKMP_INTERNAL_ERROR;
	}

	memset(&spidx, 0, sizeof(spidx));

#define _XIDT(d) ((struct ipsecdoi_id_b *)(d)->v)->type

	/* make a spidx; a key to search SPD */
	spidx.dir = IPSEC_DIR_INBOUND;
	spidx.ul_proto = 0;

	/*
	 * make destination address in spidx from either ID payload
	 * or phase 1 address into a address in spidx.
	 */
	if (iph2->id != NULL
	 && (_XIDT(iph2->id) == IPSECDOI_ID_IPV4_ADDR
	  || _XIDT(iph2->id) == IPSECDOI_ID_IPV6_ADDR
	  || _XIDT(iph2->id) == IPSECDOI_ID_IPV4_ADDR_SUBNET
	  || _XIDT(iph2->id) == IPSECDOI_ID_IPV6_ADDR_SUBNET)) {
		/* get a destination address of a policy */
		error = ipsecdoi_id2sockaddr(iph2->id,
				(struct sockaddr *)&spidx.dst,
				&spidx.prefd, &spidx.ul_proto);
		if (error)
			return error;

#ifdef INET6
		/*
		 * get scopeid from the SA address.
		 * note that the phase 1 source address is used as
		 * a destination address to search for a inbound policy entry
		 * because rcoon is responder.
		 */
		if (_XIDT(iph2->id) == IPSECDOI_ID_IPV6_ADDR) {
			error = setscopeid((struct sockaddr *)&spidx.dst,
			                    iph2->src);
			if (error)
				return error;
		}
#endif

		if (_XIDT(iph2->id) == IPSECDOI_ID_IPV4_ADDR
		 || _XIDT(iph2->id) == IPSECDOI_ID_IPV6_ADDR)
			idi2type = _XIDT(iph2->id);

	} else {

		plog(LLV_DEBUG, LOCATION, NULL,
			"get a destination address of SP index "
			"from phase1 address "
			"due to no ID payloads found "
			"OR because ID type is not address.\n");

		/*
		 * copy the SOURCE address of IKE into the DESTINATION address
		 * of the key to search the SPD because the direction of policy
		 * is inbound.
		 */
		memcpy(&spidx.dst, iph2->src, sysdep_sa_len(iph2->src));
		switch (spidx.dst.ss_family) {
		case AF_INET:
			spidx.prefd = sizeof(struct in_addr) << 3;
			break;
#ifdef INET6
		case AF_INET6:
			spidx.prefd = sizeof(struct in6_addr) << 3;
			break;
#endif
		default:
			spidx.prefd = 0;
			break;
		}
	}

	/* make source address in spidx */
	if (iph2->id_p != NULL
	 && (_XIDT(iph2->id_p) == IPSECDOI_ID_IPV4_ADDR
	  || _XIDT(iph2->id_p) == IPSECDOI_ID_IPV6_ADDR
	  || _XIDT(iph2->id_p) == IPSECDOI_ID_IPV4_ADDR_SUBNET
	  || _XIDT(iph2->id_p) == IPSECDOI_ID_IPV6_ADDR_SUBNET)) {
		/* get a source address of inbound SA */
		error = ipsecdoi_id2sockaddr(iph2->id_p,
				(struct sockaddr *)&spidx.src,
				&spidx.prefs, &spidx.ul_proto);
		if (error)
			return error;

#ifdef INET6
		/*
		 * get scopeid from the SA address.
		 * for more detail, see above of this function.
		 */
		if (_XIDT(iph2->id_p) == IPSECDOI_ID_IPV6_ADDR) {
			error = setscopeid((struct sockaddr *)&spidx.src,
			                    iph2->dst);
			if (error)
				return error;
		}
#endif

		/* Before setting iph2->[sa_src, sa_dst] with the addresses
		 * provided in ID payloads, we check:
		 * - they are both addresses of same family
		 * - sainfo has not been selected only based on ID payload
		 *   information but also based on specific Phase 1
		 *   credentials (iph2->sainfo->id_i is defined), i.e.
		 *   local configuration _explicitly_ expect that user
		 *   (e.g. from asn1dn "C=FR, ...") with those IDs) */
		if (_XIDT(iph2->id_p) == idi2type &&
		    spidx.dst.ss_family == spidx.src.ss_family &&
		    iph2->sainfo && iph2->sainfo->id_i) {

			iph2->sa_src = dupsaddr((struct sockaddr *)&spidx.dst);
			if (iph2->sa_src  == NULL) {
				plog(LLV_ERROR, LOCATION, NULL,
				    "buffer allocation failed.\n");
				return ISAKMP_INTERNAL_ERROR;
			}

			iph2->sa_dst = dupsaddr((struct sockaddr *)&spidx.src);
			if (iph2->sa_dst  == NULL) {
				plog(LLV_ERROR, LOCATION, NULL,
				    "buffer allocation failed.\n");
				return ISAKMP_INTERNAL_ERROR;
			}
		} else {
			plog(LLV_DEBUG, LOCATION, NULL,
			     "Either family (%d - %d), types (%d - %d) of ID "
			     "from initiator differ or matching sainfo "
			     "has no id_i defined for the peer. Not filling "
			     "iph2->sa_src and iph2->sa_dst.\n",
			     spidx.src.ss_family, spidx.dst.ss_family,
			     _XIDT(iph2->id_p),idi2type);
		}
	} else {
		plog(LLV_DEBUG, LOCATION, NULL,
		     "get a source address of SP index from Phase 1"
		     "addresses due to no ID payloads found"
		     "OR because ID type is not address.\n");

		/* see above comment. */
		memcpy(&spidx.src, iph2->dst, sysdep_sa_len(iph2->dst));
		switch (spidx.src.ss_family) {
		case AF_INET:
			spidx.prefs = sizeof(struct in_addr) << 3;
			break;
#ifdef INET6
		case AF_INET6:
			spidx.prefs = sizeof(struct in6_addr) << 3;
			break;
#endif
		default:
			spidx.prefs = 0;
			break;
		}
	}

#undef _XIDT

	plog(LLV_DEBUG, LOCATION, NULL,
		"get src address from ID payload "
		"%s prefixlen=%u ul_proto=%u\n",
		saddr2str((struct sockaddr *)&spidx.src),
		spidx.prefs, spidx.ul_proto);
	plog(LLV_DEBUG, LOCATION, NULL,
		"get dst address from ID payload "
		"%s prefixlen=%u ul_proto=%u\n",
		saddr2str((struct sockaddr *)&spidx.dst),
		spidx.prefd, spidx.ul_proto);

	/*
	 * convert the ul_proto if it is 0
	 * because 0 in ID payload means a wild card.
	 */
	if (spidx.ul_proto == 0)
		spidx.ul_proto = IPSEC_ULPROTO_ANY;

#ifdef HAVE_SECCTX
	/*
	 * Need to use security context in spidx to ensure the correct
	 * policy is selected. The only way to get the security context
	 * is to look into the proposal sent by peer ahead of time.
	 */
	if (get_security_context(iph2->sa, &spidx)) {
		plog(LLV_ERROR, LOCATION, NULL,
		     "error occurred trying to get security context.\n");
		return ISAKMP_INTERNAL_ERROR;
	}
#endif /* HAVE_SECCTX */

	/* get inbound policy */
	sp_in = getsp_r(&spidx);
	if (sp_in == NULL) {
		if (iph2->ph1->rmconf->gen_policy) {
			plog(LLV_INFO, LOCATION, NULL,
				"no policy found, "
				"try to generate the policy : %s\n",
				spidx2str(&spidx));
			iph2->spidx_gen = racoon_malloc(sizeof(spidx));
			if (!iph2->spidx_gen) {
				plog(LLV_ERROR, LOCATION, NULL,
					"buffer allocation failed.\n");
				return ISAKMP_INTERNAL_ERROR;
			}
			memcpy(iph2->spidx_gen, &spidx, sizeof(spidx));
			return -2;	/* special value */
		}
		plog(LLV_ERROR, LOCATION, NULL,
			"no policy found: %s\n", spidx2str(&spidx));
		return ISAKMP_INTERNAL_ERROR;
	}
	/* Refresh existing generated policies
	 */
	if (iph2->ph1->rmconf->gen_policy) {
		plog(LLV_INFO, LOCATION, NULL,
			 "Update the generated policy : %s\n",
			 spidx2str(&spidx));
		iph2->spidx_gen = racoon_malloc(sizeof(spidx));
		if (!iph2->spidx_gen) {
			plog(LLV_ERROR, LOCATION, NULL,
				 "buffer allocation failed.\n");
			return ISAKMP_INTERNAL_ERROR;
		}
		memcpy(iph2->spidx_gen, &spidx, sizeof(spidx));
	}

	/* get outbound policy */
    {
	struct sockaddr_storage addr;
	u_int8_t pref;

	spidx.dir = IPSEC_DIR_OUTBOUND;
	addr = spidx.src;
	spidx.src = spidx.dst;
	spidx.dst = addr;
	pref = spidx.prefs;
	spidx.prefs = spidx.prefd;
	spidx.prefd = pref;

	sp_out = getsp_r(&spidx);
	if (!sp_out) {
		plog(LLV_WARNING, LOCATION, NULL,
			"no outbound policy found: %s\n",
			spidx2str(&spidx));
	}
    }

	plog(LLV_DEBUG, LOCATION, NULL,
		"suitable SP found:%s\n", spidx2str(&spidx));

	/*
	 * In the responder side, the inbound policy should be using IPsec.
	 * outbound policy is not checked currently.
	 */
	if (sp_in->policy != IPSEC_POLICY_IPSEC) {
		plog(LLV_ERROR, LOCATION, NULL,
			"policy found, but no IPsec required: %s\n",
			spidx2str(&spidx));
		return ISAKMP_INTERNAL_ERROR;
	}

	/* set new proposal derived from a policy into the iph2->proposal. */
	if (set_proposal_from_policy(iph2, sp_in, sp_out) < 0) {
		plog(LLV_ERROR, LOCATION, NULL,
			"failed to create saprop.\n");
		return ISAKMP_INTERNAL_ERROR;
	}

#ifdef HAVE_SECCTX
	if (spidx.sec_ctx.ctx_str) {
		set_secctx_in_proposal(iph2, spidx);
	}
#endif /* HAVE_SECCTX */

	iph2->spid = sp_in->id;

	return 0;
}

/*
 * handle a notification payload inside phase2 exchange.
 * phase2 is always encrypted, so it does not need to be checked
 * for explicitely.
 */
static int
ph2_recv_n(iph2, gen)
	struct ph2handle *iph2;
	struct isakmp_gen *gen;
{
	struct ph1handle *iph1 = iph2->ph1;
	struct isakmp_pl_n *notify = (struct isakmp_pl_n *) gen;
	u_int type;
	int check_level;

	type = ntohs(notify->type);
	switch (type) {
	case ISAKMP_NTYPE_CONNECTED:
		break;
	case ISAKMP_NTYPE_INITIAL_CONTACT:
		return isakmp_info_recv_initialcontact(iph1, iph2);
	case ISAKMP_NTYPE_RESPONDER_LIFETIME:
		ipsecdoi_parse_responder_lifetime(notify,
			&iph2->lifetime_secs, &iph2->lifetime_kb);

		if (iph1 != NULL && iph1->rmconf != NULL) {
			check_level = iph1->rmconf->pcheck_level;
		} else {
			if (iph1 != NULL)
				plog(LLV_DEBUG, LOCATION, NULL,
					"No phase1 rmconf found !\n");
			else
				plog(LLV_DEBUG, LOCATION, NULL,
					"No phase1 found !\n");
			check_level = PROP_CHECK_EXACT;
		}

		switch (check_level) {
		case PROP_CHECK_OBEY:
			break;
		case PROP_CHECK_STRICT:
		case PROP_CHECK_CLAIM:
			if (iph2->sainfo == NULL
			 || iph2->sainfo->lifetime <= iph2->lifetime_secs) {
				plog(LLV_WARNING, LOCATION, NULL,
					"RESPONDER-LIFETIME: lifetime mismatch\n");
				iph2->lifetime_secs = 0;
			}
			break;
		case PROP_CHECK_EXACT:
			if (iph2->sainfo == NULL
			 || iph2->sainfo->lifetime != iph2->lifetime_secs) {
				plog(LLV_WARNING, LOCATION, NULL,
					"RESPONDER-LIFETIME: lifetime mismatch\n");
				iph2->lifetime_secs = 0;
			}
			break;
		}
		break;
	default:
		isakmp_log_notify(iph2->ph1, notify, "phase2 exchange");
		isakmp_info_send_n2(iph2, ISAKMP_NTYPE_INVALID_PAYLOAD_TYPE,
			NULL);
		break;
	}
	return 0;
}