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74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
/**
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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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/* 8 Bit for the exchange type */
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{ U_INT_8, offsetof(ike_header_t, exchange_type) },
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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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/**
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* This informations are needed for autmatic parsing of header content
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*/
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payload_info_t ike_header_info = {HEADER,
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sizeof(ike_header_t),
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ike_header_encodings,
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(sizeof(ike_header_encodings)/sizeof(encoding_rule_t))};
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