git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7653 818b1a75-f10b-46b9-bf7c-635c3b92a50f
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gauthier
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/*******************************************************************************
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OpenAirInterface
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Copyright(c) 1999 - 2014 Eurecom
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OpenAirInterface is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenAirInterface is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenAirInterface.The full GNU General Public License is
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included in this distribution in the file called "COPYING". If not,
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see <http://www.gnu.org/licenses/>.
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Contact Information
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OpenAirInterface Admin: openair_admin@eurecom.fr
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OpenAirInterface Tech : openair_tech@eurecom.fr
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OpenAirInterface Dev : openair4g-devel@eurecom.fr
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Address : Eurecom, Compus SophiaTech 450, route des chappes, 06451 Biot, France.
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*******************************************************************************/
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/*****************************************************************************
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Source as_message.c
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Version 0.1
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Date 2012/11/06
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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 messages supported by the Access Stratum sublayer
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protocol (usually RRC and S1AP for E-UTRAN) and functions used
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to encode and decode
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*****************************************************************************/
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#include "as_message.h"
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#include "commonDef.h"
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#include "nas_log.h"
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#include <string.h> // memcpy
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#include <stdlib.h> // free
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/****************************************************************************/
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/**************** E X T E R N A L D E F I N I T I O N S ****************/
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/****************************************************************************/
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/****************************************************************************/
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/******************* L O C A L D E F I N I T I O N 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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/****************************************************************************
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** **
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** Name: as_message_decode() **
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** **
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** Description: Decode AS message and accordingly fills data structure **
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** **
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** Inputs: buffer: Pointer to the buffer containing the **
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** message **
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** length: Number of bytes that should be decoded **
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** Others: None **
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** **
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** Outputs: msg: AS message structure to be filled **
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** Return: The AS message identifier when the buffer **
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** has been successfully decoded; **
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** RETURNerror otherwise. **
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** Others: None **
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** **
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***************************************************************************/
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int as_message_decode(const char* buffer, as_message_t* msg, int length)
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{
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LOG_FUNC_IN;
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int bytes;
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Byte_t** data = NULL;
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/* Get the message type */
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msg->msgID = *(UInt16_t*)(buffer);
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bytes = sizeof(UInt16_t);
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switch (msg->msgID) {
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case AS_NAS_ESTABLISH_REQ:
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/* NAS signalling connection establish request */
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bytes += sizeof(nas_establish_req_t) - sizeof(Byte_t*);
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data = &msg->msg.nas_establish_req.initialNasMsg.data;
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break;
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case AS_NAS_ESTABLISH_IND:
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/* NAS signalling connection establishment indication */
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bytes += sizeof(nas_establish_ind_t) - sizeof(Byte_t*);
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data = &msg->msg.nas_establish_ind.initialNasMsg.data;
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break;
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case AS_NAS_ESTABLISH_RSP:
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/* NAS signalling connection establishment response */
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bytes += sizeof(nas_establish_rsp_t) - sizeof(Byte_t*);
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data = &msg->msg.nas_establish_rsp.nasMsg.data;
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break;
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case AS_NAS_ESTABLISH_CNF:
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/* NAS signalling connection establishment confirm */
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bytes += sizeof(nas_establish_cnf_t) - sizeof(Byte_t*);
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data = &msg->msg.nas_establish_cnf.nasMsg.data;
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break;
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case AS_UL_INFO_TRANSFER_REQ:
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/* Uplink L3 data transfer request */
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bytes += sizeof(ul_info_transfer_req_t) - sizeof(Byte_t*);
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data = &msg->msg.ul_info_transfer_req.nasMsg.data;
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break;
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case AS_UL_INFO_TRANSFER_IND:
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/* Uplink L3 data transfer indication */
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bytes += sizeof(ul_info_transfer_ind_t) - sizeof(Byte_t*);
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data = &msg->msg.ul_info_transfer_ind.nasMsg.data;
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break;
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case AS_DL_INFO_TRANSFER_REQ:
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/* Downlink L3 data transfer request */
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bytes += sizeof(dl_info_transfer_req_t) - sizeof(Byte_t*);
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data = &msg->msg.dl_info_transfer_req.nasMsg.data;
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break;
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case AS_DL_INFO_TRANSFER_IND:
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/* Downlink L3 data transfer indication */
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bytes += sizeof(dl_info_transfer_ind_t) - sizeof(Byte_t*);
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data = &msg->msg.dl_info_transfer_ind.nasMsg.data;
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break;
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case AS_BROADCAST_INFO_IND:
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case AS_CELL_INFO_REQ:
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case AS_CELL_INFO_CNF:
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case AS_CELL_INFO_IND:
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case AS_PAGING_REQ:
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case AS_PAGING_IND:
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case AS_NAS_RELEASE_REQ:
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case AS_UL_INFO_TRANSFER_CNF:
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case AS_DL_INFO_TRANSFER_CNF:
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case AS_NAS_RELEASE_IND:
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case AS_RAB_ESTABLISH_REQ:
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case AS_RAB_ESTABLISH_IND:
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case AS_RAB_ESTABLISH_RSP:
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case AS_RAB_ESTABLISH_CNF:
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case AS_RAB_RELEASE_REQ:
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case AS_RAB_RELEASE_IND:
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/* Messages without dedicated NAS information */
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bytes = length;
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break;
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default:
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bytes = 0;
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LOG_TRACE(WARNING, "NET-API - AS message 0x%x is not valid",
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msg->msgID);
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break;
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}
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if (bytes > 0) {
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if (data) {
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/* Set the pointer to dedicated NAS information */
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*data = (Byte_t*)(buffer + bytes);
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}
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/* Decode the message */
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memcpy(msg, (as_message_t*)buffer, bytes);
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LOG_FUNC_RETURN (msg->msgID);
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}
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LOG_TRACE(WARNING, "NET-API - Failed to decode AS message 0x%x",
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msg->msgID);
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LOG_FUNC_RETURN (RETURNerror);
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}
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/****************************************************************************
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** **
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** Name: as_message_encode() **
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** **
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** Description: Encode AS message **
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** **
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** Inputs: msg: AS message structure to encode **
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** length: Maximal capacity of the output buffer **
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** Others: None **
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** **
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** Outputs: buffer: Pointer to the encoded data buffer **
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** Return: The number of characters in the buffer **
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** when data have been successfully encoded; **
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** RETURNerror otherwise. **
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** Others: None **
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** **
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***************************************************************************/
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int as_message_encode(char* buffer, as_message_t* msg, int length)
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{
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LOG_FUNC_IN;
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int bytes = sizeof(msg->msgID);
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as_nas_info_t* nas_msg = NULL;
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switch (msg->msgID) {
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case AS_BROADCAST_INFO_IND:
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/* Broadcast information */
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bytes += sizeof(broadcast_info_ind_t);
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break;
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case AS_CELL_INFO_REQ:
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/* Cell information request */
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bytes += sizeof(cell_info_req_t);
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break;
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case AS_CELL_INFO_CNF:
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/* Cell information response */
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bytes += sizeof(cell_info_cnf_t);
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break;
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case AS_CELL_INFO_IND:
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/* Cell information indication */
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bytes += sizeof(cell_info_ind_t);
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break;
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case AS_PAGING_REQ:
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/* Paging information request */
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bytes += sizeof(paging_req_t);
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break;
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case AS_PAGING_IND:
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/* Paging information indication */
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bytes += sizeof(paging_ind_t);
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break;
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case AS_NAS_ESTABLISH_REQ:
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/* NAS signalling connection establish request */
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bytes += sizeof(nas_establish_req_t) - sizeof(Byte_t*);
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nas_msg = &msg->msg.nas_establish_req.initialNasMsg;
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break;
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case AS_NAS_ESTABLISH_IND:
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/* NAS signalling connection establish indication */
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bytes += sizeof(nas_establish_ind_t) - sizeof(Byte_t*);
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nas_msg = &msg->msg.nas_establish_ind.initialNasMsg;
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break;
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case AS_NAS_ESTABLISH_RSP:
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/* NAS signalling connection establish response */
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bytes += sizeof(nas_establish_rsp_t) - sizeof(Byte_t*);
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nas_msg = &msg->msg.nas_establish_rsp.nasMsg;
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break;
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case AS_NAS_ESTABLISH_CNF:
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/* NAS signalling connection establish confirm */
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bytes += sizeof(nas_establish_cnf_t) - sizeof(Byte_t*);
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nas_msg = &msg->msg.nas_establish_cnf.nasMsg;
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break;
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case AS_NAS_RELEASE_REQ:
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/* NAS signalling connection release request */
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bytes += sizeof(nas_release_req_t);
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break;
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case AS_NAS_RELEASE_IND:
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/* NAS signalling connection release indication */
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bytes += sizeof(nas_release_ind_t);
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break;
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case AS_UL_INFO_TRANSFER_REQ:
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/* Uplink L3 data transfer request */
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bytes += sizeof(ul_info_transfer_req_t) - sizeof(Byte_t*);
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nas_msg = &msg->msg.ul_info_transfer_req.nasMsg;
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break;
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case AS_UL_INFO_TRANSFER_CNF:
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/* Uplink L3 data transfer confirm */
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bytes += sizeof(ul_info_transfer_cnf_t);
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break;
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case AS_UL_INFO_TRANSFER_IND:
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/* Uplink L3 data transfer indication */
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bytes += sizeof(ul_info_transfer_ind_t) - sizeof(Byte_t*);
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nas_msg = &msg->msg.ul_info_transfer_ind.nasMsg;
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break;
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case AS_DL_INFO_TRANSFER_REQ:
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/* Downlink L3 data transfer */
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bytes += sizeof(dl_info_transfer_req_t) - sizeof(Byte_t*);
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nas_msg = &msg->msg.dl_info_transfer_req.nasMsg;
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break;
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case AS_DL_INFO_TRANSFER_CNF:
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/* Downlink L3 data transfer confirm */
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bytes += sizeof(dl_info_transfer_cnf_t);
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break;
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case AS_DL_INFO_TRANSFER_IND:
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/* Downlink L3 data transfer indication */
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bytes += sizeof(dl_info_transfer_ind_t) - sizeof(Byte_t*);
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nas_msg = &msg->msg.dl_info_transfer_ind.nasMsg;
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break;
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case AS_RAB_ESTABLISH_REQ:
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/* Radio Access Bearer establishment request */
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bytes += sizeof(rab_establish_req_t);
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break;
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case AS_RAB_ESTABLISH_IND:
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/* Radio Access Bearer establishment indication */
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bytes += sizeof(rab_establish_ind_t);
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break;
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case AS_RAB_ESTABLISH_RSP:
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/* Radio Access Bearer establishment response */
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bytes += sizeof(rab_establish_rsp_t);
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break;
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case AS_RAB_ESTABLISH_CNF:
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/* Radio Access Bearer establishment confirm */
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bytes += sizeof(rab_establish_cnf_t);
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break;
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case AS_RAB_RELEASE_REQ:
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/* Radio Access Bearer release request */
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bytes += sizeof(rab_release_req_t);
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break;
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case AS_RAB_RELEASE_IND:
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/* Radio Access Bearer release indication */
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bytes += sizeof(rab_release_ind_t);
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break;
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default:
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LOG_TRACE(WARNING, "NET-API - AS message 0x%x is not valid",
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msg->msgID);
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bytes = length;
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break;
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}
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if (length > bytes) {
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/* Encode the AS message */
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memcpy(buffer, (unsigned char*)msg, bytes);
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if ( nas_msg && (nas_msg->length > 0) ) {
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/* Copy the NAS message */
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memcpy(buffer + bytes, nas_msg->data, nas_msg->length);
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bytes += nas_msg->length;
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/* Release NAS message memory */
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free(nas_msg->data);
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nas_msg->length = 0;
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nas_msg->data = NULL;
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}
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LOG_FUNC_RETURN (bytes);
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}
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LOG_TRACE(WARNING, "NET-API - Failed to encode AS message 0x%x",
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msg->msgID);
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LOG_FUNC_RETURN (RETURNerror);
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}
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/****************************************************************************/
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/********************* L O C A L F U N C T I O N S *********************/
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/****************************************************************************/
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