- defined data struct and encoding rules for the ikev2-header
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Jan Hutter
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63
Source/charon/encodings/ike_header.c
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63
Source/charon/encodings/ike_header.c
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/**
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* @file ike_header.c
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*
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* @brief Definition of the encoding rules used when parsing or generating
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* an IKEv2-Header
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/* offsetof macro */
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#include <stddef.h>
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#include "../encodings.h"
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#include "ike_header.h"
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/**
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* Encoding rules to parse or generate a IKEv2-Header
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*
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* The defined offsets are the positions in a struct of type
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* ike_header_t.
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*
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*/
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encoding_rule_t ike_header_encodings[] = {
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/* 8 Byte SPI, stored in the field initiator_spi */
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{ U_INT_64, offsetof(ike_header_t, initiator_spi) },
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/* 8 Byte SPI, stored in the field responder_spi */
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{ U_INT_64, offsetof(ike_header_t, responder_spi) },
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/* 1 Byte next payload type, stored in the field next_payload */
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{ U_INT_8, offsetof(ike_header_t, next_payload) },
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/* 4 Bit major version, stored in the field maj_version */
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{ U_INT_4, offsetof(ike_header_t, maj_version) },
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/* 4 Bit minor version, stored in the field min_version */
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{ U_INT_4, offsetof(ike_header_t, min_version) },
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/* 2 Bit reserved bits, nowhere stored */
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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/* 3 Bit flags, stored in the fields response, version and initiator */
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{ FLAG, offsetof(ike_header_t, flags.response) },
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{ FLAG, offsetof(ike_header_t, flags.version) },
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{ FLAG, offsetof(ike_header_t, flags.initiator) },
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/* 3 Bit reserved bits, nowhere stored */
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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/* 4 Byte message id, stored in the field message_id */
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{ U_INT_32, offsetof(ike_header_t, message_id) },
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/* 4 Byte length fied, stored in the field length */
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{ LENGTH, offsetof(ike_header_t, length) }
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};
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98
Source/charon/encodings/ike_header.h
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98
Source/charon/encodings/ike_header.h
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/**
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* @file ike_header.h
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*
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* @brief Declaration of the data struct ike_header_t.
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*
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* The data of a parsed header are stored in a struct of this type.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef IKE_HEADER_H_
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#define IKE_HEADER_H_
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#include <freeswan.h>
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#include <pluto/constants.h>
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#include <pluto/defs.h>
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/**
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* Data structure to hold the data of an IKEv2-Header
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*
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* The header format of an IKEv2-Message is compatible to the
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* ISAKMP-Header format to allow implementations supporting
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* both versions of the IKE-protocol.
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*
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*/
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typedef struct ike_header_s ike_header_t;
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struct ike_header_s{
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/**
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* SPI of the initiator
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*/
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u_int32_t initiator_spi;
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/**
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* SPI of the responder
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*/
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u_int32_t responder_spi;
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/**
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* next payload type
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*/
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u_int8_t next_payload;
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/**
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* IKE major version
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*/
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u_int8_t maj_version;
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/**
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* IKE minor version
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*/
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u_int8_t min_version;
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/**
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* Exchange type
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*/
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u_int8_t exchange_type;
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/**
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* Flags of the Message
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*
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*/
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struct {
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/**
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* Sender is initiator of the associated IKE_SA_INIT-Exchange
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*/
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bool initiator;
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/**
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* is protocol supporting higher version?
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*/
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bool version;
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/**
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* TRUE, if this is a response, FALSE if its a Request
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*/
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bool response;
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} flags;
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/**
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* Associated Message-ID
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*/
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u_int32_t message_id;
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/**
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* Length of the whole IKEv2-Message (header and all payloads)
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*/
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u_int32_t length;
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};
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#endif /*IKE_HEADER_H_*/
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