125 lines
4.4 KiB
C
125 lines
4.4 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*****************************************************************************
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Source nas_message.h
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Version 0.1
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Date 2012/26/09
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Product NAS stack
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Subsystem Application Programming Interface
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Author Frederic Maurel
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Description Defines the layer 3 messages supported by the NAS sublayer
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protocol and functions used to encode and decode
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*****************************************************************************/
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#ifndef __NAS_MESSAGE_H__
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#define __NAS_MESSAGE_H__
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#include "commonDef.h"
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#include "emm_msg.h"
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#include "esm_msg.h"
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/****************************************************************************/
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/********************* G L O B A L C O N S T A N T S *******************/
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/****************************************************************************/
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#define NAS_MESSAGE_SECURITY_HEADER_SIZE 6
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/****************************************************************************/
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/************************ G L O B A L T Y P E S ************************/
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/****************************************************************************/
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/* Structure of security protected header */
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typedef struct {
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#ifdef __LITTLE_ENDIAN_BITFIELD
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eps_protocol_discriminator_t protocol_discriminator:4;
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uint8_t security_header_type:4;
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#endif
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#ifdef __BIG_ENDIAN_BITFIELD
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uint8_t security_header_type:4;
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uint8_t protocol_discriminator:4;
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#endif
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uint32_t message_authentication_code;
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uint8_t sequence_number;
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} nas_message_security_header_t;
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/* Structure of plain NAS message */
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typedef union {
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EMM_msg emm; /* EPS Mobility Management messages */
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ESM_msg esm; /* EPS Session Management messages */
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} nas_message_plain_t;
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/* Structure of security protected NAS message */
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typedef struct {
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nas_message_security_header_t header;
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nas_message_plain_t plain;
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} nas_message_security_protected_t;
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/*
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* Structure of a layer 3 NAS message
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*/
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typedef union {
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nas_message_security_header_t header;
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nas_message_security_protected_t security_protected;
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nas_message_plain_t plain;
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} nas_message_t;
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/****************************************************************************/
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/******************** G L O B A L V A R I A B L E S ********************/
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/****************************************************************************/
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/****************************************************************************/
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/****************** E X P O R T E D F U N C T I O N S ******************/
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/****************************************************************************/
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int nas_message_encrypt(
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const char *inbuf,
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char *outbuf,
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const nas_message_security_header_t *header,
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int length,
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void *security);
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int nas_message_decrypt(const char *inbuf,
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char *outbuf,
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nas_message_security_header_t *header,
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int length,
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void *security);
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int nas_message_decode(
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const char * const buffer,
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nas_message_t *msg,
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int length,
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void *security);
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int nas_message_encode(
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char *buffer,
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const nas_message_t * const msg,
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int length,
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void *security);
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#endif /* __NAS_MESSAGE_H__*/
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