src/libcharon/encoding/payloads/ike_header.c - manifest_repos/strongswan - Git at Google

 /*
  * Copyright (C) 2007 Tobias Brunner
  * Copyright (C) 2005-2006 Martin Willi
  * Copyright (C) 2005 Jan Hutter
  * HSR Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
  * Free Software Foundation; either version 2 of the License, or (at your
  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * for more details.
  */

 /* offsetof macro */
 #include <stddef.h>

 #include "ike_header.h"

 #include <encoding/payloads/encodings.h>


 typedef struct private_ike_header_t private_ike_header_t;

 /**
  * Private data of an ike_header_t object.
  */
 struct private_ike_header_t {
 	/**
 	 * Public interface.
 	 */
 	ike_header_t public;

 	/**
 	 * SPI of the initiator.
 	 */
 	uint64_t initiator_spi;

 	/**
 	 * SPI of the responder.
 	 */
 	uint64_t responder_spi;

 	/**
 	 * Next payload type.
 	 */
 	uint8_t  next_payload;
 	/**
 	 * IKE major version.
 	 */
 	uint8_t  maj_version;

 	/**
 	 * IKE minor version.
 	 */
 	uint8_t  min_version;

 	/**
 	 * Exchange type .
 	 */
 	uint8_t  exchange_type;

 	/**
 	 * Flags of the Message.
 	 */
 	struct {
 		/**
 		 * Sender is initiator of the associated IKE_SA_INIT-Exchange.
 		 */
 		bool initiator;

 		/**
 		 * Is protocol supporting higher version?
 		 */
 		bool version;

 		/**
 		 * TRUE, if this is a response, FALSE if its a Request.
 		 */
 		bool response;

 		/**
 		 * TRUE, if the packet is encrypted (IKEv1).
 		 */
 		bool encryption;

 		/**
 		 * TRUE, if the commit flag is set (IKEv1).
 		 */
 		bool commit;

 		/**
 		 * TRUE, if the auth only flag is set (IKEv1).
 		 */
 		bool authonly;
 	} flags;

 	/**
 	 * Reserved bits of IKE header
 	 */
 	bool reserved[2];

 	/**
 	 * Associated Message-ID.
 	 */
 	uint32_t message_id;

 	/**
 	 * Length of the whole IKEv2-Message (header and all payloads).
 	 */
 	uint32_t length;
 };

 ENUM_BEGIN(exchange_type_names, ID_PROT, TRANSACTION,
 	"ID_PROT",
 	"AUTH_ONLY",
 	"AGGRESSIVE",
 	"INFORMATIONAL_V1",
 	"TRANSACTION");
 ENUM_NEXT(exchange_type_names, QUICK_MODE, IKE_SESSION_RESUME, TRANSACTION,
 	"QUICK_MODE",
 	"NEW_GROUP_MODE",
 	"IKE_SA_INIT",
 	"IKE_AUTH",
 	"CREATE_CHILD_SA",
 	"INFORMATIONAL",
 	"IKE_SESSION_RESUME");
 #ifdef ME
 ENUM_NEXT(exchange_type_names, ME_CONNECT, ME_CONNECT, IKE_SESSION_RESUME,
 	"ME_CONNECT");
 ENUM_NEXT(exchange_type_names, EXCHANGE_TYPE_UNDEFINED,
 							   EXCHANGE_TYPE_UNDEFINED, ME_CONNECT,
 	"EXCHANGE_TYPE_UNDEFINED");
 #else
 ENUM_NEXT(exchange_type_names, EXCHANGE_TYPE_UNDEFINED,
 							   EXCHANGE_TYPE_UNDEFINED, IKE_SESSION_RESUME,
 	"EXCHANGE_TYPE_UNDEFINED");
 #endif /* ME */
 ENUM_END(exchange_type_names, EXCHANGE_TYPE_UNDEFINED);

 /**
  * Encoding rules to parse or generate a IKE-Header.
  *
  * The defined offsets are the positions in a object of type
  * ike_header_t.
  */
 static encoding_rule_t encodings[] = {
 	/* 8 Byte SPI, stored in the field initiator_spi */
 	{ IKE_SPI,		offsetof(private_ike_header_t, initiator_spi)	},
 	/* 8 Byte SPI, stored in the field responder_spi */
 	{ IKE_SPI,		offsetof(private_ike_header_t, responder_spi)	},
 	/* 1 Byte next payload type, stored in the field next_payload */
 	{ U_INT_8,		offsetof(private_ike_header_t, next_payload)	},
 	/* 4 Bit major version, stored in the field maj_version */
 	{ U_INT_4,		offsetof(private_ike_header_t, maj_version)		},
 	/* 4 Bit minor version, stored in the field min_version */
 	{ U_INT_4,		offsetof(private_ike_header_t, min_version)		},
 	/* 8 Bit for the exchange type */
 	{ U_INT_8,		offsetof(private_ike_header_t, exchange_type)	},
 	/* 2 Bit reserved bits */
 	{ RESERVED_BIT,	offsetof(private_ike_header_t, reserved[0])		},
 	{ RESERVED_BIT,	offsetof(private_ike_header_t, reserved[1])		},
 	/* 6 flags  */
 	{ FLAG,			offsetof(private_ike_header_t, flags.response)	},
 	{ FLAG,			offsetof(private_ike_header_t, flags.version)	},
 	{ FLAG,			offsetof(private_ike_header_t, flags.initiator)	},
 	{ FLAG,			offsetof(private_ike_header_t, flags.authonly)	},
 	{ FLAG,			offsetof(private_ike_header_t, flags.commit)	},
 	{ FLAG,			offsetof(private_ike_header_t, flags.encryption)},
 	/* 4 Byte message id, stored in the field message_id */
 	{ U_INT_32,		offsetof(private_ike_header_t, message_id)		},
 	/* 4 Byte length field, stored in the field length */
 	{ HEADER_LENGTH,	offsetof(private_ike_header_t, length)			}
 };

 /*                         1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       !                       IKE_SA Initiator's SPI                  !
       !                                                               !
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       !                       IKE_SA Responder's SPI                  !
       !                                                               !
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       !  Next Payload ! MjVer ! MnVer ! Exchange Type !     Flags     !
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       !                          Message ID                           !
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       !                            Length                             !
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */

 METHOD(payload_t, verify, status_t,
 	private_ike_header_t *this)
 {
 	switch (this->exchange_type)
 	{
 		case ID_PROT:
 		case AGGRESSIVE:
 			if (this->message_id != 0)
 			{
 				return FAILED;
 			}
 			/* fall */
 		case AUTH_ONLY:
 		case INFORMATIONAL_V1:
 		case TRANSACTION:
 		case QUICK_MODE:
 		case NEW_GROUP_MODE:
 			if (this->maj_version == IKEV2_MAJOR_VERSION)
 			{
 				/* IKEv1 exchange type in IKEv2? */
 				return FAILED;
 			}
 			break;
 		case IKE_SA_INIT:
 		case IKE_AUTH:
 		case CREATE_CHILD_SA:
 		case INFORMATIONAL:
 		case IKE_SESSION_RESUME:
 #ifdef ME
 		case ME_CONNECT:
 #endif /* ME */
 			if (this->maj_version == IKEV1_MAJOR_VERSION)
 			{
 				/* IKEv2 exchange type in IKEv1? */
 				return FAILED;
 			}
 			break;
 		default:
 			if (this->maj_version == IKEV1_MAJOR_VERSION ||
 				this->maj_version == IKEV2_MAJOR_VERSION)
 			{
 				/* unsupported exchange type for known version */
 				return FAILED;
 			}
 			break;
 	}
 	if (this->initiator_spi == 0)
 	{
 #ifdef ME
 		if (this->exchange_type != INFORMATIONAL)
 			/* we allow zero spi for INFORMATIONAL exchanges,
 			 * to allow connectivity checks */
 #endif /* ME */
 		{
 			return FAILED;
 		}
 	}
 	return SUCCESS;
 }

 METHOD(payload_t, get_encoding_rules, int,
 	private_ike_header_t *this, encoding_rule_t **rules)
 {
 	*rules = encodings;
 	return countof(encodings);
 }

 METHOD(payload_t, get_header_length, int,
 	private_ike_header_t *this)
 {
 	return IKE_HEADER_LENGTH;
 }

 METHOD(payload_t, get_type, payload_type_t,
 	private_ike_header_t *this)
 {
 	return PL_HEADER;
 }

 METHOD(payload_t, get_next_type, payload_type_t,
 	private_ike_header_t *this)
 {
 	return this->next_payload;
 }

 METHOD(payload_t, set_next_type, void,
 	private_ike_header_t *this, payload_type_t type)
 {
 	this->next_payload = type;
 }

 METHOD(payload_t, get_length, size_t,
 	private_ike_header_t *this)
 {
 	return this->length;
 }

 METHOD(ike_header_t, get_initiator_spi, uint64_t,
 	private_ike_header_t *this)
 {
 	return this->initiator_spi;
 }

 METHOD(ike_header_t, set_initiator_spi, void,
 	private_ike_header_t *this, uint64_t initiator_spi)
 {
 	this->initiator_spi = initiator_spi;
 }

 METHOD(ike_header_t, get_responder_spi, uint64_t,
 	private_ike_header_t *this)
 {
 	return this->responder_spi;
 }

 METHOD(ike_header_t, set_responder_spi, void,
 	private_ike_header_t *this, uint64_t responder_spi)
 {
 	this->responder_spi = responder_spi;
 }

 METHOD(ike_header_t, get_maj_version, uint8_t,
 	private_ike_header_t *this)
 {
 	return this->maj_version;
 }

 METHOD(ike_header_t, set_maj_version, void,
 	private_ike_header_t *this, uint8_t major)
 {
 	this->maj_version = major;
 }

 METHOD(ike_header_t, get_min_version, uint8_t,
 	private_ike_header_t *this)
 {
 	return this->min_version;
 }

 METHOD(ike_header_t, set_min_version, void,
 	private_ike_header_t *this, uint8_t minor)
 {
 	this->min_version = minor;
 }

 METHOD(ike_header_t, get_response_flag, bool,
 	private_ike_header_t *this)
 {
 	return this->flags.response;
 }

 METHOD(ike_header_t, set_response_flag, void,
 	private_ike_header_t *this, bool response)
 {
 	this->flags.response = response;
 }

 METHOD(ike_header_t, get_version_flag, bool,
 	private_ike_header_t *this)
 {
 	return this->flags.version;
 }

 METHOD(ike_header_t, set_version_flag, void,
 	private_ike_header_t *this, bool version)
 {
 	this->flags.version = version;
 }

 METHOD(ike_header_t, get_initiator_flag, bool,
 	private_ike_header_t *this)
 {
 	return this->flags.initiator;
 }

 METHOD(ike_header_t, set_initiator_flag, void,
 	private_ike_header_t *this, bool initiator)
 {
 	this->flags.initiator = initiator;
 }

 METHOD(ike_header_t, get_encryption_flag, bool,
 	private_ike_header_t *this)
 {
 	return this->flags.encryption;
 }

 METHOD(ike_header_t, set_encryption_flag, void,
 	private_ike_header_t *this, bool encryption)
 {
 	this->flags.encryption = encryption;
 }


 METHOD(ike_header_t, get_commit_flag, bool,
 	private_ike_header_t *this)
 {
 	return this->flags.commit;
 }

 METHOD(ike_header_t, set_commit_flag, void,
 	private_ike_header_t *this, bool commit)
 {
 	this->flags.commit = commit;
 }

 METHOD(ike_header_t, get_authonly_flag, bool,
 	private_ike_header_t *this)
 {
 	return this->flags.authonly;
 }

 METHOD(ike_header_t, set_authonly_flag, void,
 	private_ike_header_t *this, bool authonly)
 {
 	this->flags.authonly = authonly;
 }

 METHOD(ike_header_t, get_exchange_type, uint8_t,
 	private_ike_header_t *this)
 {
 	return this->exchange_type;
 }

 METHOD(ike_header_t, set_exchange_type, void,
 	private_ike_header_t *this, uint8_t exchange_type)
 {
 	this->exchange_type = exchange_type;
 }

 METHOD(ike_header_t, get_message_id, uint32_t,
 	private_ike_header_t *this)
 {
 	return this->message_id;
 }

 METHOD(ike_header_t, set_message_id, void,
 	private_ike_header_t *this, uint32_t message_id)
 {
 	this->message_id = message_id;
 }

 METHOD2(payload_t, ike_header_t, destroy, void,
 	private_ike_header_t *this)
 {
 	free(this);
 }

 /*
  * Described in header.
  */
 ike_header_t *ike_header_create()
 {
 	private_ike_header_t *this;

 	INIT(this,
 		.public = {
 			.payload_interface = {
 				.verify = _verify,
 				.get_encoding_rules = _get_encoding_rules,
 				.get_header_length = _get_header_length,
 				.get_length = _get_length,
 				.get_next_type = _get_next_type,
 				.set_next_type = _set_next_type,
 				.get_type = _get_type,
 				.destroy = _destroy,
 			},
 			.get_initiator_spi = _get_initiator_spi,
 			.set_initiator_spi = _set_initiator_spi,
 			.get_responder_spi = _get_responder_spi,
 			.set_responder_spi = _set_responder_spi,
 			.get_maj_version = _get_maj_version,
 			.set_maj_version = _set_maj_version,
 			.get_min_version = _get_min_version,
 			.set_min_version = _set_min_version,
 			.get_response_flag = _get_response_flag,
 			.set_response_flag = _set_response_flag,
 			.get_version_flag = _get_version_flag,
 			.set_version_flag = _set_version_flag,
 			.get_initiator_flag = _get_initiator_flag,
 			.set_initiator_flag = _set_initiator_flag,
 			.get_encryption_flag = _get_encryption_flag,
 			.set_encryption_flag = _set_encryption_flag,
 			.get_commit_flag = _get_commit_flag,
 			.set_commit_flag = _set_commit_flag,
 			.get_authonly_flag = _get_authonly_flag,
 			.set_authonly_flag = _set_authonly_flag,
 			.get_exchange_type = _get_exchange_type,
 			.set_exchange_type = _set_exchange_type,
 			.get_message_id = _get_message_id,
 			.set_message_id = _set_message_id,
 			.destroy = _destroy,
 		},
 		.length = IKE_HEADER_LENGTH,
 		.exchange_type = EXCHANGE_TYPE_UNDEFINED,
 	);

 	return &this->public;
 }

 /*
  * Described in header.
  */
 ike_header_t *ike_header_create_version(int major, int minor)
 {
 	ike_header_t *this = ike_header_create();

 	this->set_maj_version(this, major);
 	this->set_min_version(this, minor);
 	if (major == IKEV2_MAJOR_VERSION)
 	{
 		this->set_initiator_flag(this, TRUE);
 	}
 	return this;
 }
	/*
	* Copyright (C) 2007 Tobias Brunner
	* Copyright (C) 2005-2006 Martin Willi
	* Copyright (C) 2005 Jan Hutter
	* HSR Hochschule fuer Technik Rapperswil
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* for more details.
	*/

	/* offsetof macro */
	#include <stddef.h>

	#include "ike_header.h"

	#include <encoding/payloads/encodings.h>


	typedef struct private_ike_header_t private_ike_header_t;

	/**
	* Private data of an ike_header_t object.
	*/
	struct private_ike_header_t {
	/**
	* Public interface.
	*/
	ike_header_t public;

	/**
	* SPI of the initiator.
	*/
	uint64_t initiator_spi;

	/**
	* SPI of the responder.
	*/
	uint64_t responder_spi;

	/**
	* Next payload type.
	*/
	uint8_t next_payload;
	/**
	* IKE major version.
	*/
	uint8_t maj_version;

	/**
	* IKE minor version.
	*/
	uint8_t min_version;

	/**
	* Exchange type .
	*/
	uint8_t exchange_type;

	/**
	* Flags of the Message.
	*/
	struct {
	/**
	* Sender is initiator of the associated IKE_SA_INIT-Exchange.
	*/
	bool initiator;

	/**
	* Is protocol supporting higher version?
	*/
	bool version;

	/**
	* TRUE, if this is a response, FALSE if its a Request.
	*/
	bool response;

	/**
	* TRUE, if the packet is encrypted (IKEv1).
	*/
	bool encryption;

	/**
	* TRUE, if the commit flag is set (IKEv1).
	*/
	bool commit;

	/**
	* TRUE, if the auth only flag is set (IKEv1).
	*/
	bool authonly;
	} flags;

	/**
	* Reserved bits of IKE header
	*/
	bool reserved[2];

	/**
	* Associated Message-ID.
	*/
	uint32_t message_id;

	/**
	* Length of the whole IKEv2-Message (header and all payloads).
	*/
	uint32_t length;
	};

	ENUM_BEGIN(exchange_type_names, ID_PROT, TRANSACTION,
	"ID_PROT",
	"AUTH_ONLY",
	"AGGRESSIVE",
	"INFORMATIONAL_V1",
	"TRANSACTION");
	ENUM_NEXT(exchange_type_names, QUICK_MODE, IKE_SESSION_RESUME, TRANSACTION,
	"QUICK_MODE",
	"NEW_GROUP_MODE",
	"IKE_SA_INIT",
	"IKE_AUTH",
	"CREATE_CHILD_SA",
	"INFORMATIONAL",
	"IKE_SESSION_RESUME");
	#ifdef ME
	ENUM_NEXT(exchange_type_names, ME_CONNECT, ME_CONNECT, IKE_SESSION_RESUME,
	"ME_CONNECT");
	ENUM_NEXT(exchange_type_names, EXCHANGE_TYPE_UNDEFINED,
	EXCHANGE_TYPE_UNDEFINED, ME_CONNECT,
	"EXCHANGE_TYPE_UNDEFINED");
	#else
	ENUM_NEXT(exchange_type_names, EXCHANGE_TYPE_UNDEFINED,
	EXCHANGE_TYPE_UNDEFINED, IKE_SESSION_RESUME,
	"EXCHANGE_TYPE_UNDEFINED");
	#endif /* ME */
	ENUM_END(exchange_type_names, EXCHANGE_TYPE_UNDEFINED);

	/**
	* Encoding rules to parse or generate a IKE-Header.
	*
	* The defined offsets are the positions in a object of type
	* ike_header_t.
	*/
	static encoding_rule_t encodings[] = {
	/* 8 Byte SPI, stored in the field initiator_spi */
	{ IKE_SPI, offsetof(private_ike_header_t, initiator_spi) },
	/* 8 Byte SPI, stored in the field responder_spi */
	{ IKE_SPI, offsetof(private_ike_header_t, responder_spi) },
	/* 1 Byte next payload type, stored in the field next_payload */
	{ U_INT_8, offsetof(private_ike_header_t, next_payload) },
	/* 4 Bit major version, stored in the field maj_version */
	{ U_INT_4, offsetof(private_ike_header_t, maj_version) },
	/* 4 Bit minor version, stored in the field min_version */
	{ U_INT_4, offsetof(private_ike_header_t, min_version) },
	/* 8 Bit for the exchange type */
	{ U_INT_8, offsetof(private_ike_header_t, exchange_type) },
	/* 2 Bit reserved bits */
	{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[0]) },
	{ RESERVED_BIT, offsetof(private_ike_header_t, reserved[1]) },
	/* 6 flags */
	{ FLAG, offsetof(private_ike_header_t, flags.response) },
	{ FLAG, offsetof(private_ike_header_t, flags.version) },
	{ FLAG, offsetof(private_ike_header_t, flags.initiator) },
	{ FLAG, offsetof(private_ike_header_t, flags.authonly) },
	{ FLAG, offsetof(private_ike_header_t, flags.commit) },
	{ FLAG, offsetof(private_ike_header_t, flags.encryption)},
	/* 4 Byte message id, stored in the field message_id */
	{ U_INT_32, offsetof(private_ike_header_t, message_id) },
	/* 4 Byte length field, stored in the field length */
	{ HEADER_LENGTH, offsetof(private_ike_header_t, length) }
	};

	/* 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	! IKE_SA Initiator's SPI !
	! !
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	! IKE_SA Responder's SPI !
	! !
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	! Next Payload ! MjVer ! MnVer ! Exchange Type ! Flags !
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	! Message ID !
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	! Length !
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	*/

	METHOD(payload_t, verify, status_t,
	private_ike_header_t *this)
	{
	switch (this->exchange_type)
	{
	case ID_PROT:
	case AGGRESSIVE:
	if (this->message_id != 0)
	{
	return FAILED;
	}
	/* fall */
	case AUTH_ONLY:
	case INFORMATIONAL_V1:
	case TRANSACTION:
	case QUICK_MODE:
	case NEW_GROUP_MODE:
	if (this->maj_version == IKEV2_MAJOR_VERSION)
	{
	/* IKEv1 exchange type in IKEv2? */
	return FAILED;
	}
	break;
	case IKE_SA_INIT:
	case IKE_AUTH:
	case CREATE_CHILD_SA:
	case INFORMATIONAL:
	case IKE_SESSION_RESUME:
	#ifdef ME
	case ME_CONNECT:
	#endif /* ME */
	if (this->maj_version == IKEV1_MAJOR_VERSION)
	{
	/* IKEv2 exchange type in IKEv1? */
	return FAILED;
	}
	break;
	default:
	if (this->maj_version == IKEV1_MAJOR_VERSION \|\|
	this->maj_version == IKEV2_MAJOR_VERSION)
	{
	/* unsupported exchange type for known version */
	return FAILED;
	}
	break;
	}
	if (this->initiator_spi == 0)
	{
	#ifdef ME
	if (this->exchange_type != INFORMATIONAL)
	/* we allow zero spi for INFORMATIONAL exchanges,
	* to allow connectivity checks */
	#endif /* ME */
	{
	return FAILED;
	}
	}
	return SUCCESS;
	}

	METHOD(payload_t, get_encoding_rules, int,
	private_ike_header_t this, encoding_rule_t *rules)
	{
	*rules = encodings;
	return countof(encodings);
	}

	METHOD(payload_t, get_header_length, int,
	private_ike_header_t *this)
	{
	return IKE_HEADER_LENGTH;
	}

	METHOD(payload_t, get_type, payload_type_t,
	private_ike_header_t *this)
	{
	return PL_HEADER;
	}

	METHOD(payload_t, get_next_type, payload_type_t,
	private_ike_header_t *this)
	{
	return this->next_payload;
	}

	METHOD(payload_t, set_next_type, void,
	private_ike_header_t *this, payload_type_t type)
	{
	this->next_payload = type;
	}

	METHOD(payload_t, get_length, size_t,
	private_ike_header_t *this)
	{
	return this->length;
	}

	METHOD(ike_header_t, get_initiator_spi, uint64_t,
	private_ike_header_t *this)
	{
	return this->initiator_spi;
	}

	METHOD(ike_header_t, set_initiator_spi, void,
	private_ike_header_t *this, uint64_t initiator_spi)
	{
	this->initiator_spi = initiator_spi;
	}

	METHOD(ike_header_t, get_responder_spi, uint64_t,
	private_ike_header_t *this)
	{
	return this->responder_spi;
	}

	METHOD(ike_header_t, set_responder_spi, void,
	private_ike_header_t *this, uint64_t responder_spi)
	{
	this->responder_spi = responder_spi;
	}

	METHOD(ike_header_t, get_maj_version, uint8_t,
	private_ike_header_t *this)
	{
	return this->maj_version;
	}

	METHOD(ike_header_t, set_maj_version, void,
	private_ike_header_t *this, uint8_t major)
	{
	this->maj_version = major;
	}

	METHOD(ike_header_t, get_min_version, uint8_t,
	private_ike_header_t *this)
	{
	return this->min_version;
	}

	METHOD(ike_header_t, set_min_version, void,
	private_ike_header_t *this, uint8_t minor)
	{
	this->min_version = minor;
	}

	METHOD(ike_header_t, get_response_flag, bool,
	private_ike_header_t *this)
	{
	return this->flags.response;
	}

	METHOD(ike_header_t, set_response_flag, void,
	private_ike_header_t *this, bool response)
	{
	this->flags.response = response;
	}

	METHOD(ike_header_t, get_version_flag, bool,
	private_ike_header_t *this)
	{
	return this->flags.version;
	}

	METHOD(ike_header_t, set_version_flag, void,
	private_ike_header_t *this, bool version)
	{
	this->flags.version = version;
	}

	METHOD(ike_header_t, get_initiator_flag, bool,
	private_ike_header_t *this)
	{
	return this->flags.initiator;
	}

	METHOD(ike_header_t, set_initiator_flag, void,
	private_ike_header_t *this, bool initiator)
	{
	this->flags.initiator = initiator;
	}

	METHOD(ike_header_t, get_encryption_flag, bool,
	private_ike_header_t *this)
	{
	return this->flags.encryption;
	}

	METHOD(ike_header_t, set_encryption_flag, void,
	private_ike_header_t *this, bool encryption)
	{
	this->flags.encryption = encryption;
	}


	METHOD(ike_header_t, get_commit_flag, bool,
	private_ike_header_t *this)
	{
	return this->flags.commit;
	}

	METHOD(ike_header_t, set_commit_flag, void,
	private_ike_header_t *this, bool commit)
	{
	this->flags.commit = commit;
	}

	METHOD(ike_header_t, get_authonly_flag, bool,
	private_ike_header_t *this)
	{
	return this->flags.authonly;
	}

	METHOD(ike_header_t, set_authonly_flag, void,
	private_ike_header_t *this, bool authonly)
	{
	this->flags.authonly = authonly;
	}

	METHOD(ike_header_t, get_exchange_type, uint8_t,
	private_ike_header_t *this)
	{
	return this->exchange_type;
	}

	METHOD(ike_header_t, set_exchange_type, void,
	private_ike_header_t *this, uint8_t exchange_type)
	{
	this->exchange_type = exchange_type;
	}

	METHOD(ike_header_t, get_message_id, uint32_t,
	private_ike_header_t *this)
	{
	return this->message_id;
	}

	METHOD(ike_header_t, set_message_id, void,
	private_ike_header_t *this, uint32_t message_id)
	{
	this->message_id = message_id;
	}

	METHOD2(payload_t, ike_header_t, destroy, void,
	private_ike_header_t *this)
	{
	free(this);
	}

	/*
	* Described in header.
	*/
	ike_header_t *ike_header_create()
	{
	private_ike_header_t *this;

	INIT(this,
	.public = {
	.payload_interface = {
	.verify = _verify,
	.get_encoding_rules = _get_encoding_rules,
	.get_header_length = _get_header_length,
	.get_length = _get_length,
	.get_next_type = _get_next_type,
	.set_next_type = _set_next_type,
	.get_type = _get_type,
	.destroy = _destroy,
	},
	.get_initiator_spi = _get_initiator_spi,
	.set_initiator_spi = _set_initiator_spi,
	.get_responder_spi = _get_responder_spi,
	.set_responder_spi = _set_responder_spi,
	.get_maj_version = _get_maj_version,
	.set_maj_version = _set_maj_version,
	.get_min_version = _get_min_version,
	.set_min_version = _set_min_version,
	.get_response_flag = _get_response_flag,
	.set_response_flag = _set_response_flag,
	.get_version_flag = _get_version_flag,
	.set_version_flag = _set_version_flag,
	.get_initiator_flag = _get_initiator_flag,
	.set_initiator_flag = _set_initiator_flag,
	.get_encryption_flag = _get_encryption_flag,
	.set_encryption_flag = _set_encryption_flag,
	.get_commit_flag = _get_commit_flag,
	.set_commit_flag = _set_commit_flag,
	.get_authonly_flag = _get_authonly_flag,
	.set_authonly_flag = _set_authonly_flag,
	.get_exchange_type = _get_exchange_type,
	.set_exchange_type = _set_exchange_type,
	.get_message_id = _get_message_id,
	.set_message_id = _set_message_id,
	.destroy = _destroy,
	},
	.length = IKE_HEADER_LENGTH,
	.exchange_type = EXCHANGE_TYPE_UNDEFINED,
	);

	return &this->public;
	}

	/*
	* Described in header.
	*/
	ike_header_t *ike_header_create_version(int major, int minor)
	{
	ike_header_t *this = ike_header_create();

	this->set_maj_version(this, major);
	this->set_min_version(this, minor);
	if (major == IKEV2_MAJOR_VERSION)
	{
	this->set_initiator_flag(this, TRUE);
	}
	return this;
	}