openairinterface5g/openair-cn/NAS/nas_main.c

/*******************************************************************************

  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2013 Eurecom

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope 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.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information
  Openair Admin: openair_admin@eurecom.fr
  Openair Tech : openair_tech@eurecom.fr
  Forums       : http://forums.eurecom.fr/openairinterface
  Address      : EURECOM, Campus SophiaTech, 450 Route des Chappes
                 06410 Biot FRANCE

*******************************************************************************/

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>

#include "intertask_interface.h"
#include "mme_config.h"

#include "nas_defs.h"

#if !defined(DISABLE_USE_NAS)
# include "nas_network.h"
# include "nas_proc.h"
# include "emm_main.h"
# include "nas_log.h"
# include "nas_timer.h"
#endif

#define NAS_ERROR(x, args...) do { fprintf(stderr, "[NAS] [E]"x, ##args); } while(0)
#define NAS_DEBUG(x, args...) do { fprintf(stdout, "[NAS] [D]"x, ##args); } while(0)
#define NAS_WARN(x, args...)  do { fprintf(stdout, "[NAS] [W]"x, ##args); } while(0)

static void *nas_intertask_interface(void *args_p)
{
    itti_mark_task_ready(TASK_NAS_MME);

    while(1) {
        MessageDef *received_message_p;

next_message:
        itti_receive_msg(TASK_NAS_MME, &received_message_p);

        switch (ITTI_MSG_ID(received_message_p))
        {
            case NAS_CONNECTION_ESTABLISHMENT_IND: {
#if defined(DISABLE_USE_NAS)
                MessageDef       *message_p;
                nas_attach_req_t *nas_req_p;
                s1ap_initial_ue_message_t *transparent;

                NAS_DEBUG("NAS abstraction: Generating NAS ATTACH REQ\n");

                message_p = itti_alloc_new_message(TASK_NAS_MME, NAS_ATTACH_REQ);

                nas_req_p = &message_p->ittiMsg.nas_attach_req;
                transparent = &message_p->ittiMsg.nas_attach_req.transparent;

                nas_req_p->initial = INITIAL_REQUEST;
                sprintf(nas_req_p->imsi, "%14llu", 20834123456789ULL);

                memcpy(transparent, &received_message_p->ittiMsg.nas_conn_est_ind.transparent,
                       sizeof(s1ap_initial_ue_message_t));

                itti_send_msg_to_task(TASK_MME_APP, INSTANCE_DEFAULT, message_p);
#else
                nas_establish_ind_t *nas_est_ind_p;

                nas_est_ind_p = &received_message_p->ittiMsg.nas_conn_est_ind.nas;

                nas_proc_establish_ind(nas_est_ind_p->UEid,
                                       nas_est_ind_p->tac,
                                       nas_est_ind_p->initialNasMsg.data,
                                       nas_est_ind_p->initialNasMsg.length);
#endif
            } break;

#if defined(DISABLE_USE_NAS)
            case NAS_ATTACH_ACCEPT: {
                itti_send_msg_to_task(TASK_S1AP, INSTANCE_DEFAULT, received_message_p);
                goto next_message;
            } break;

            case NAS_AUTHENTICATION_REQ: {
                MessageDef      *message_p;
                nas_auth_resp_t *nas_resp_p;

                NAS_DEBUG("NAS abstraction: Generating NAS AUTHENTICATION RESPONSE\n");

                message_p = itti_alloc_new_message(TASK_NAS_MME, NAS_AUTHENTICATION_RESP);

                nas_resp_p = &message_p->ittiMsg.nas_auth_resp;

                memcpy(nas_resp_p->imsi, received_message_p->ittiMsg.nas_auth_req.imsi, 16);

                itti_send_msg_to_task(TASK_MME_APP, INSTANCE_DEFAULT, message_p);
            } break;
#else
            case NAS_UPLINK_DATA_IND: {
                nas_proc_ul_transfer_ind(NAS_UL_DATA_IND(received_message_p).UEid,
                                         NAS_UL_DATA_IND(received_message_p).nasMsg.data,
                                         NAS_UL_DATA_IND(received_message_p).nasMsg.length);
            } break;

            case NAS_DOWNLINK_DATA_CNF: {
//                 nas_proc_dl_transfer_cnf(NAS_DL_DATA_CNF(received_message_p).UEid);
            } break;

            case NAS_AUTHENTICATION_PARAM_RSP: {
                nas_proc_auth_param_res(&NAS_AUTHENTICATION_PARAM_RSP(received_message_p));
            } break;

            case NAS_AUTHENTICATION_PARAM_FAIL: {
                nas_proc_auth_param_fail(&NAS_AUTHENTICATION_PARAM_FAIL(received_message_p));
            } break;
#endif

            case TIMER_HAS_EXPIRED: {
#if !defined(DISABLE_USE_NAS)
                /* Call the NAS timer api */
                nas_timer_handle_signal_expiry(TIMER_HAS_EXPIRED(received_message_p).timer_id,
                                               TIMER_HAS_EXPIRED(received_message_p).arg);
#endif
            } break;

            case S1AP_ENB_DEREGISTERED_IND: {
#if !defined(DISABLE_USE_NAS)
                int i;
                for (i = 0; i < S1AP_ENB_DEREGISTERED_IND(received_message_p).nb_ue_to_deregister; i ++) {
                    nas_proc_deregister_ue(S1AP_ENB_DEREGISTERED_IND(received_message_p).mme_ue_s1ap_id[i]);
                }
#endif
            } break;

            case S1AP_DEREGISTER_UE_REQ: {
#if !defined(DISABLE_USE_NAS)
                nas_proc_deregister_ue(S1AP_DEREGISTER_UE_REQ(received_message_p).mme_ue_s1ap_id);
#endif
            } break;

            case TERMINATE_MESSAGE: {
                itti_exit_task();
            } break;

            default: {
                NAS_DEBUG("Unkwnon message ID %d:%s from %s\n",
                          ITTI_MSG_ID(received_message_p),
                          ITTI_MSG_NAME(received_message_p),
                          ITTI_MSG_ORIGIN_NAME(received_message_p));
            } break;
        }
        itti_free(ITTI_MSG_ORIGIN_ID(received_message_p), received_message_p);
        received_message_p = NULL;
    }
    return NULL;
}

int nas_init(mme_config_t *mme_config_p)
{
    NAS_DEBUG("Initializing NAS task interface\n");

#if !defined(DISABLE_USE_NAS)
    nas_log_init(0x2F);
    nas_network_initialize(mme_config_p);
#endif

    if (itti_create_task(TASK_NAS_MME, &nas_intertask_interface,
                                        NULL) < 0) {
        NAS_ERROR("Create task failed");
        NAS_DEBUG("Initializing NAS task interface: FAILED\n");
        return -1;
    }
    NAS_DEBUG("Initializing NAS task interface: DONE\n");
    return 0;
}