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path: root/src/charon/encoding/payloads/ike_header.c
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Diffstat (limited to 'src/charon/encoding/payloads/ike_header.c')
-rw-r--r--src/charon/encoding/payloads/ike_header.c406
1 files changed, 406 insertions, 0 deletions
diff --git a/src/charon/encoding/payloads/ike_header.c b/src/charon/encoding/payloads/ike_header.c
new file mode 100644
index 000000000..b1b4fbf87
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+++ b/src/charon/encoding/payloads/ike_header.c
@@ -0,0 +1,406 @@
+/**
+ * @file ike_header.c
+ *
+ * @brief Implementation of ike_header_t.
+ *
+ */
+
+/*
+ * 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");
+ENUM_END(exchange_type_names, INFORMATIONAL);
+
+/**
+ * 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))
+ {
+ /* unsupported exchange type */
+ return FAILED;
+ }
+ if (this->initiator_spi == 0)
+ {
+ /* 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 19:19:19 +0000