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/*
* Copyright (C) 2008 Martin Willi
* 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.
*/
/**
* @defgroup ha_message ha_message
* @{ @ingroup ha
*/
#ifndef HA_MESSAGE_H_
#define HA_MESSAGE_H_
#include <library.h>
#include <networking/host.h>
#include <utils/identification.h>
#include <sa/ike_sa_id.h>
#include <selectors/traffic_selector.h>
/**
* Protocol version of this implementation
*/
#define HA_MESSAGE_VERSION 3
typedef struct ha_message_t ha_message_t;
typedef enum ha_message_type_t ha_message_type_t;
typedef enum ha_message_attribute_t ha_message_attribute_t;
typedef union ha_message_value_t ha_message_value_t;
/**
* Type of a HA message
*/
enum ha_message_type_t {
/** add a completely new IKE_SA */
HA_IKE_ADD = 1,
/** update an existing IKE_SA (identities, address update, ...) */
HA_IKE_UPDATE,
/** update initiator message id */
HA_IKE_MID_INITIATOR,
/** update responder message id */
HA_IKE_MID_RESPONDER,
/** delete an existing IKE_SA */
HA_IKE_DELETE,
/** add a new CHILD_SA */
HA_CHILD_ADD,
/** delete an existing CHILD_SA */
HA_CHILD_DELETE,
/** segments the sending node is giving up */
HA_SEGMENT_DROP,
/** segments the sending node is taking over */
HA_SEGMENT_TAKE,
/** status with the segments the sending node is currently serving */
HA_STATUS,
/** segments the receiving node is requested to resync */
HA_RESYNC,
/** IV synchronization for IKEv1 Main/Aggressive mode */
HA_IKE_IV,
};
/**
* Enum names for message types
*/
extern enum_name_t *ha_message_type_names;
/**
* Type of attributes contained in a message
*/
enum ha_message_attribute_t {
/** ike_sa_id_t*, to identify IKE_SA */
HA_IKE_ID = 1,
/** ike_sa_id_t*, identifies IKE_SA which gets rekeyed */
HA_IKE_REKEY_ID,
/** identification_t*, local identity */
HA_LOCAL_ID,
/** identification_t*, remote identity */
HA_REMOTE_ID,
/** identification_t*, remote EAP identity */
HA_REMOTE_EAP_ID,
/** host_t*, local address */
HA_LOCAL_ADDR,
/** host_t*, remote address */
HA_REMOTE_ADDR,
/** char*, name of configuration */
HA_CONFIG_NAME,
/** u_int32_t, bitset of ike_condition_t */
HA_CONDITIONS,
/** u_int32_t, bitset of ike_extension_t */
HA_EXTENSIONS,
/** host_t*, local virtual IP */
HA_LOCAL_VIP,
/** host_t*, remote virtual IP */
HA_REMOTE_VIP,
/** host_t*, known peer addresses (used for MOBIKE) */
HA_PEER_ADDR,
/** u_int8_t, initiator of an exchange, TRUE for local */
HA_INITIATOR,
/** chunk_t, initiators nonce */
HA_NONCE_I,
/** chunk_t, responders nonce */
HA_NONCE_R,
/** chunk_t, diffie hellman shared secret */
HA_SECRET,
/** chunk_t, SKd of old SA if rekeying */
HA_OLD_SKD,
/** u_int16_t, pseudo random function */
HA_ALG_PRF,
/** u_int16_t, old pseudo random function if rekeying */
HA_ALG_OLD_PRF,
/** u_int16_t, encryption algorithm */
HA_ALG_ENCR,
/** u_int16_t, encryption key size in bytes */
HA_ALG_ENCR_LEN,
/** u_int16_t, integrity protection algorithm */
HA_ALG_INTEG,
/** u_int8_t, IPsec mode, TUNNEL|TRANSPORT|... */
HA_IPSEC_MODE,
/** u_int8_t, IPComp protocol */
HA_IPCOMP,
/** u_int32_t, inbound security parameter index */
HA_INBOUND_SPI,
/** u_int32_t, outbound security parameter index */
HA_OUTBOUND_SPI,
/** u_int16_t, inbound security parameter index */
HA_INBOUND_CPI,
/** u_int16_t, outbound security parameter index */
HA_OUTBOUND_CPI,
/** traffic_selector_t*, local traffic selector */
HA_LOCAL_TS,
/** traffic_selector_t*, remote traffic selector */
HA_REMOTE_TS,
/** u_int32_t, message ID */
HA_MID,
/** u_int16_t, HA segment */
HA_SEGMENT,
/** u_int16_t, Extended Sequence numbers */
HA_ESN,
/** u_int8_t, IKE version */
HA_IKE_VERSION,
/** chunk_t, own DH public value */
HA_LOCAL_DH,
/** chunk_t, remote DH public value */
HA_REMOTE_DH,
/** chunk_t, shared secret for IKEv1 key derivation */
HA_PSK,
/** chunk_t, IV for next IKEv1 message */
HA_IV,
};
/**
* Union to enumerate typed attributes in a message
*/
union ha_message_value_t {
u_int8_t u8;
u_int16_t u16;
u_int32_t u32;
char *str;
chunk_t chunk;
ike_sa_id_t *ike_sa_id;
identification_t *id;
host_t *host;
traffic_selector_t *ts;
};
/**
* Abstracted message passed between nodes in a HA cluster.
*/
struct ha_message_t {
/**
* Get the type of the message.
*
* @return message type
*/
ha_message_type_t (*get_type)(ha_message_t *this);
/**
* Add an attribute to a message.
*
* @param attribute attribute type to add
* @param ... attribute specific data
*/
void (*add_attribute)(ha_message_t *this,
ha_message_attribute_t attribute, ...);
/**
* Create an enumerator over all attributes in a message.
*
* @return enumerator over attribute, ha_message_value_t
*/
enumerator_t* (*create_attribute_enumerator)(ha_message_t *this);
/**
* Get the message in a encoded form.
*
* @return chunk pointing to internal data
*/
chunk_t (*get_encoding)(ha_message_t *this);
/**
* Destroy a ha_message_t.
*/
void (*destroy)(ha_message_t *this);
};
/**
* Create a new ha_message instance, ready for adding attributes
*
* @param type type of the message
*/
ha_message_t *ha_message_create(ha_message_type_t type);
/**
* Create a ha_message from encoded data.
*
* @param data encoded message data
*/
ha_message_t *ha_message_parse(chunk_t data);
#endif /** HA_MESSAGE_ @}*/
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