diff options
Diffstat (limited to 'src/libcharon/encoding/payloads/ike_header.c')
| -rw-r--r-- | src/libcharon/encoding/payloads/ike_header.c | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/src/libcharon/encoding/payloads/ike_header.c b/src/libcharon/encoding/payloads/ike_header.c new file mode 100644 index 000000000..735f01304 --- /dev/null +++ b/src/libcharon/encoding/payloads/ike_header.c @@ -0,0 +1,415 @@ +/* + * Copyright (C) 2007 Tobias Brunner + * Copyright (C) 2005-2006 Martin Willi + * Copyright (C) 2005 Jan Hutter + * 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. + */ + u_int64_t initiator_spi; + + /** + * SPI of the responder. + */ + u_int64_t responder_spi; + + /** + * Next payload type. + */ + u_int8_t next_payload; + /** + * IKE major version. + */ + u_int8_t maj_version; + + /** + * IKE minor version. + */ + u_int8_t min_version; + + /** + * Exchange type . + */ + u_int8_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; + } flags; + + /** + * Associated Message-ID. + */ + u_int32_t message_id; + + /** + * Length of the whole IKEv2-Message (header and all payloads). + */ + u_int32_t length; +}; + +ENUM_BEGIN(exchange_type_names, EXCHANGE_TYPE_UNDEFINED, EXCHANGE_TYPE_UNDEFINED, + "EXCHANGE_TYPE_UNDEFINED"); +ENUM_NEXT(exchange_type_names, IKE_SA_INIT, INFORMATIONAL, EXCHANGE_TYPE_UNDEFINED, + "IKE_SA_INIT", + "IKE_AUTH", + "CREATE_CHILD_SA", + "INFORMATIONAL"); +#ifdef ME +ENUM_NEXT(exchange_type_names, ME_CONNECT, ME_CONNECT, INFORMATIONAL, + "ME_CONNECT"); +ENUM_END(exchange_type_names, ME_CONNECT); +#else +ENUM_END(exchange_type_names, INFORMATIONAL); +#endif /* ME */ + +/** + * Encoding rules to parse or generate a IKEv2-Header. + * + * The defined offsets are the positions in a object of type + * ike_header_t. + */ +encoding_rule_t ike_header_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, nowhere stored */ + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + /* 3 Bit flags, stored in the fields response, version and initiator */ + { FLAG, offsetof(private_ike_header_t, flags.response) }, + { FLAG, offsetof(private_ike_header_t, flags.version) }, + { FLAG, offsetof(private_ike_header_t, flags.initiator) }, + /* 3 Bit reserved bits, nowhere stored */ + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + { RESERVED_BIT, 0 }, + /* 4 Byte message id, stored in the field message_id */ + { U_INT_32, offsetof(private_ike_header_t, message_id) }, + /* 4 Byte length fied, 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 ! + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +*/ + + +/** + * Implementation of payload_t.verify. + */ +static status_t verify(private_ike_header_t *this) +{ + if ((this->exchange_type < IKE_SA_INIT) || + ((this->exchange_type > INFORMATIONAL) +#ifdef ME + && (this->exchange_type != ME_CONNECT) +#endif /* ME */ + )) + { + /* unsupported exchange type */ + return FAILED; + } + + if (this->initiator_spi == 0 +#ifdef ME + /* we allow zero spi for INFORMATIONAL exchanges, + * to allow connectivity checks */ + && this->exchange_type != INFORMATIONAL +#endif /* ME */ + ) + { + /* initiator spi not set */ + return FAILED; + } + + /* verification of version is not done in here */ + + return SUCCESS; +} + +/** + * Implementation of payload_t.set_next_type. + */ +static void set_next_type(payload_t *this,payload_type_t type) +{ + ((private_ike_header_t *)this)->next_payload = type; +} +/** + * Implementation of ike_header_t.get_initiator_spi. + */ +static u_int64_t get_initiator_spi(private_ike_header_t *this) +{ + return this->initiator_spi; +} + +/** + * Implementation of ike_header_t.set_initiator_spi. + */ +static void set_initiator_spi(private_ike_header_t *this, u_int64_t initiator_spi) +{ + this->initiator_spi = initiator_spi; +} + +/** + * Implementation of ike_header_t.get_responder_spi. + */ +static u_int64_t get_responder_spi(private_ike_header_t *this) +{ + return this->responder_spi; +} + +/** + * Implementation of ike_header_t.set_responder_spi. + */ +static void set_responder_spi(private_ike_header_t *this, u_int64_t responder_spi) +{ + this->responder_spi = responder_spi; +} + +/** + * Implementation of ike_header_t.get_maj_version. + */ +static u_int8_t get_maj_version(private_ike_header_t *this) +{ + return this->maj_version; +} + +/** + * Implementation of ike_header_t.get_min_version. + */ +static u_int8_t get_min_version(private_ike_header_t *this) +{ + return this->min_version; +} + +/** + * Implementation of ike_header_t.get_response_flag. + */ +static bool get_response_flag(private_ike_header_t *this) +{ + return this->flags.response; +} + +/** + * Implementation of ike_header_t.set_response_flag. + */ +static void set_response_flag(private_ike_header_t *this, bool response) +{ + this->flags.response = response; +} + +/** + * Implementation of ike_header_t.get_version_flag. + */ +static bool get_version_flag(private_ike_header_t *this) +{ + return this->flags.version; +} + +/** + * Implementation of ike_header_t.get_initiator_flag. + */ +static bool get_initiator_flag(private_ike_header_t *this) +{ + return this->flags.initiator; +} + +/** + * Implementation of ike_header_t.set_initiator_flag. + */ +static void set_initiator_flag(private_ike_header_t *this, bool initiator) +{ + this->flags.initiator = initiator; +} + +/** + * Implementation of ike_header_t.get_exchange_type. + */ +static u_int8_t get_exchange_type(private_ike_header_t *this) +{ + return this->exchange_type; +} + +/** + * Implementation of ike_header_t.set_exchange_type. + */ +static void set_exchange_type(private_ike_header_t *this, u_int8_t exchange_type) +{ + this->exchange_type = exchange_type; +} + +/** + * Implements ike_header_t's get_message_id function. + * See #ike_header_t.get_message_id for description. + */ +static u_int32_t get_message_id(private_ike_header_t *this) +{ + return this->message_id; +} + +/** + * Implementation of ike_header_t.set_message_id. + */ +static void set_message_id(private_ike_header_t *this, u_int32_t message_id) +{ + this->message_id = message_id; +} + +/** + * Implementation of ike_header_t.destroy and payload_t.destroy. + */ +static void destroy(ike_header_t *this) +{ + free(this); +} + +/** + * Implementation of payload_t.get_encoding_rules. + */ +static void get_encoding_rules(payload_t *this, encoding_rule_t **rules, size_t *rule_count) +{ + *rules = ike_header_encodings; + *rule_count = sizeof(ike_header_encodings) / sizeof(encoding_rule_t); +} + +/** + * Implementation of payload_t.get_type. + */ +static payload_type_t get_type(payload_t *this) +{ + return HEADER; +} + +/** + * Implementation of payload_t.get_next_type. + */ +static payload_type_t get_next_type(payload_t *this) +{ + return (((private_ike_header_t*)this)->next_payload); +} + +/** + * Implementation of payload_t.get_length. + */ +static size_t get_length(payload_t *this) +{ + return (((private_ike_header_t*)this)->length); +} + +/* + * Described in header. + */ +ike_header_t *ike_header_create() +{ + private_ike_header_t *this = malloc_thing(private_ike_header_t); + + this->public.payload_interface.verify = (status_t (*) (payload_t *))verify; + this->public.payload_interface.get_encoding_rules = get_encoding_rules; + this->public.payload_interface.get_length = get_length; + this->public.payload_interface.get_next_type = get_next_type; + this->public.payload_interface.set_next_type = set_next_type; + this->public.payload_interface.get_type = get_type; + this->public.payload_interface.destroy = (void (*) (payload_t *))destroy; + this->public.destroy = destroy; + + this->public.get_initiator_spi = (u_int64_t (*) (ike_header_t*))get_initiator_spi; + this->public.set_initiator_spi = (void (*) (ike_header_t*,u_int64_t))set_initiator_spi; + this->public.get_responder_spi = (u_int64_t (*) (ike_header_t*))get_responder_spi; + this->public.set_responder_spi = (void (*) (ike_header_t *,u_int64_t))set_responder_spi; + this->public.get_maj_version = (u_int8_t (*) (ike_header_t*))get_maj_version; + this->public.get_min_version = (u_int8_t (*) (ike_header_t*))get_min_version; + this->public.get_response_flag = (bool (*) (ike_header_t*))get_response_flag; + this->public.set_response_flag = (void (*) (ike_header_t*,bool))set_response_flag; + this->public.get_version_flag = (bool (*) (ike_header_t*))get_version_flag; + this->public.get_initiator_flag = (bool (*) (ike_header_t*))get_initiator_flag; + this->public.set_initiator_flag = (void (*) (ike_header_t*,bool))set_initiator_flag; + this->public.get_exchange_type = (u_int8_t (*) (ike_header_t*))get_exchange_type; + this->public.set_exchange_type = (void (*) (ike_header_t*,u_int8_t))set_exchange_type; + this->public.get_message_id = (u_int32_t (*) (ike_header_t*))get_message_id; + this->public.set_message_id = (void (*) (ike_header_t*,u_int32_t))set_message_id; + + /* set default values of the fields */ + this->initiator_spi = 0; + this->responder_spi = 0; + this->next_payload = 0; + this->maj_version = IKE_MAJOR_VERSION; + this->min_version = IKE_MINOR_VERSION; + this->exchange_type = EXCHANGE_TYPE_UNDEFINED; + this->flags.initiator = TRUE; + this->flags.version = HIGHER_VERSION_SUPPORTED_FLAG; + this->flags.response = FALSE; + this->message_id = 0; + this->length = IKE_HEADER_LENGTH; + + return (ike_header_t*)this; +} |