f1ap_cu_task.c

/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under
 * the OAI Public License, Version 1.1  (the "License"); you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.openairinterface.org/?page_id=698
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 * Unless required by applicable law or agreed to in writing, software
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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 *-------------------------------------------------------------------------------
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/*! \file openair2/F1AP/f1ap_cu_task.c
* \brief data structures for F1 interface modules
* \author EURECOM/NTUST
* \date 2018
* \version 0.1
* \company Eurecom
* \email: navid.nikaein@eurecom.fr, raymond.knopp@eurecom.fr, bing-kai.hong@eurecom.fr
* \note
* \warning
*/

#include "f1ap_common.h"
#include "f1ap_cu_interface_management.h"
#include "f1ap_cu_rrc_message_transfer.h"
#include "f1ap_cu_ue_context_management.h"
#include "f1ap_cu_task.h"
#include <openair3/ocp-gtpu/gtp_itf.h>

//Fixme: Uniq dirty DU instance, by global var, datamodel need better management
instance_t CUuniqInstance=0;

static instance_t cu_task_create_gtpu_instance_to_du(eth_params_t *IPaddrs) {
  openAddr_t tmp= {0};
  strncpy(tmp.originHost, IPaddrs->my_addr, sizeof(tmp.originHost)-1);
  strncpy(tmp.destinationHost, IPaddrs->remote_addr, sizeof(tmp.destinationHost)-1);
  sprintf(tmp.originService, "%d",  IPaddrs->my_portd);
  sprintf(tmp.destinationService, "%d",  IPaddrs->remote_portd);
  return gtpv1Init(tmp);
}

static void cu_task_handle_sctp_association_ind(instance_t instance, sctp_new_association_ind_t *sctp_new_association_ind,
    eth_params_t *IPaddrs) {
  createF1inst(true, instance, NULL);
  // save the assoc id
  f1ap_setup_req_t *f1ap_cu_data=f1ap_req(true, instance);
  f1ap_cu_data->assoc_id         = sctp_new_association_ind->assoc_id;
  f1ap_cu_data->sctp_in_streams  = sctp_new_association_ind->in_streams;
  f1ap_cu_data->sctp_out_streams = sctp_new_association_ind->out_streams;
  f1ap_cu_data->default_sctp_stream_id = 0;
  getCxt(CUtype, instance)->gtpInst=cu_task_create_gtpu_instance_to_du(IPaddrs);
  AssertFatal(getCxt(CUtype, instance)->gtpInst>0,"Failed to create CU F1-U UDP listener");
  // Fixme: fully inconsistent instances management
  // dirty global var is a bad fix
  CUuniqInstance=getCxt(CUtype, instance)->gtpInst;
}

static void cu_task_handle_sctp_association_resp(instance_t instance, sctp_new_association_resp_t *sctp_new_association_resp) {
  DevAssert(sctp_new_association_resp != NULL);

  if (sctp_new_association_resp->sctp_state != SCTP_STATE_ESTABLISHED) {
    LOG_W(F1AP, "Received unsuccessful result for SCTP association (%u), instance %ld, cnx_id %u\n",
          sctp_new_association_resp->sctp_state,
          instance,
          sctp_new_association_resp->ulp_cnx_id);
    //if (sctp_new_association_resp->sctp_state == SCTP_STATE_SHUTDOWN)
    //proto_agent_stop(instance);
    //f1ap_handle_setup_message(instance, sctp_new_association_resp->sctp_state == SCTP_STATE_SHUTDOWN);
    return; // exit -1 for debugging
  }
}

static void cu_task_handle_sctp_data_ind(instance_t instance, sctp_data_ind_t *sctp_data_ind) {
  int result;
  DevAssert(sctp_data_ind != NULL);
  f1ap_handle_message(instance, sctp_data_ind->assoc_id, sctp_data_ind->stream,
                      sctp_data_ind->buffer, sctp_data_ind->buffer_length);
  result = itti_free(TASK_UNKNOWN, sctp_data_ind->buffer);
  AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
}

static void cu_task_send_sctp_init_req(instance_t instance, char *my_addr) {
  // 1. get the itti msg, and retrive the enb_id from the message
  // 2. use RC.rrc[enb_id] to fill the sctp_init_t with the ip, port
  // 3. creat an itti message to init
  LOG_I(F1AP, "F1AP_CU_SCTP_REQ(create socket)\n");
  MessageDef  *message_p = NULL;
  message_p = itti_alloc_new_message (TASK_CU_F1, 0, SCTP_INIT_MSG);
  message_p->ittiMsg.sctp_init.port = F1AP_PORT_NUMBER;
  message_p->ittiMsg.sctp_init.ppid = F1AP_SCTP_PPID;
  message_p->ittiMsg.sctp_init.ipv4 = 1;
  message_p->ittiMsg.sctp_init.ipv6 = 0;
  message_p->ittiMsg.sctp_init.nb_ipv4_addr = 1;
  message_p->ittiMsg.sctp_init.ipv4_address[0] = inet_addr(my_addr);
  /*
   * SR WARNING: ipv6 multi-homing fails sometimes for localhost.
   * * * * Disable it for now.
   */
  message_p->ittiMsg.sctp_init.nb_ipv6_addr = 0;
  message_p->ittiMsg.sctp_init.ipv6_address[0] = "0:0:0:0:0:0:0:1";
  itti_send_msg_to_task(TASK_SCTP, instance, message_p);
}

void *F1AP_CU_task(void *arg) {
  MessageDef *received_msg = NULL;
  int         result;
  LOG_I(F1AP, "Starting F1AP at CU\n");
  // no RLC in CU, initialize mem pool for PDCP
  pool_buffer_init();
  itti_mark_task_ready(TASK_CU_F1);
  eth_params_t *IPaddrs;

  // Hardcoded instance id!
  if (RC.nrrrc && RC.nrrrc[0]->node_type == ngran_gNB_CU)
    IPaddrs=&RC.nrrrc[0]->eth_params_s;
  else
    IPaddrs=&RC.rrc[0]->eth_params_s;

  cu_task_send_sctp_init_req(0, IPaddrs->my_addr);

  while (1) {
    itti_receive_msg(TASK_CU_F1, &received_msg);

    switch (ITTI_MSG_ID(received_msg)) {
      case SCTP_NEW_ASSOCIATION_IND:
        LOG_I(F1AP, "CU Task Received SCTP_NEW_ASSOCIATION_IND for instance %ld\n",
              ITTI_MSG_DESTINATION_INSTANCE(received_msg));
        cu_task_handle_sctp_association_ind(ITTI_MSG_ORIGIN_INSTANCE(received_msg),
                                            &received_msg->ittiMsg.sctp_new_association_ind,
                                            IPaddrs);
        break;

      case SCTP_NEW_ASSOCIATION_RESP:
        LOG_I(F1AP, "CU Task Received SCTP_NEW_ASSOCIATION_RESP for instance %ld\n",
              ITTI_MSG_DESTINATION_INSTANCE(received_msg));
        cu_task_handle_sctp_association_resp(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
                                             &received_msg->ittiMsg.sctp_new_association_resp);
        break;

      case SCTP_DATA_IND:
        LOG_I(F1AP, "CU Task Received SCTP_DATA_IND for Instance %ld\n",
              ITTI_MSG_DESTINATION_INSTANCE(received_msg));
        cu_task_handle_sctp_data_ind(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
                                     &received_msg->ittiMsg.sctp_data_ind);
        break;

      case F1AP_SETUP_RESP: // from rrc
        LOG_I(F1AP, "CU Task Received F1AP_SETUP_RESP\n");
        CU_send_F1_SETUP_RESPONSE(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
                                  &F1AP_SETUP_RESP(received_msg));
        break;

      case F1AP_GNB_CU_CONFIGURATION_UPDATE: // from rrc
        LOG_I(F1AP, "CU Task Received F1AP_GNB_CU_CONFIGURAITON_UPDATE\n");
        // CU_send_f1setup_resp(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
        //                                       &F1AP_SETUP_RESP(received_msg));
        CU_send_gNB_CU_CONFIGURATION_UPDATE(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
                                            &F1AP_GNB_CU_CONFIGURATION_UPDATE(received_msg));
        break;

      case F1AP_DL_RRC_MESSAGE: // from rrc
        LOG_I(F1AP, "CU Task Received F1AP_DL_RRC_MESSAGE\n");
        CU_send_DL_RRC_MESSAGE_TRANSFER(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
                                        &F1AP_DL_RRC_MESSAGE(received_msg));
        break;

      case F1AP_UE_CONTEXT_SETUP_REQ: // from rrc
        LOG_I(F1AP, "CU Task Received F1AP_UE_CONTEXT_SETUP_REQ\n");
        CU_send_UE_CONTEXT_SETUP_REQUEST(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
                                         &F1AP_UE_CONTEXT_SETUP_REQ(received_msg));
        break;

      case F1AP_UE_CONTEXT_RELEASE_CMD: // from rrc
        LOG_I(F1AP, "CU Task Received F1AP_UE_CONTEXT_RELEASE_CMD\n");
        CU_send_UE_CONTEXT_RELEASE_COMMAND(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
                                           &F1AP_UE_CONTEXT_RELEASE_CMD(received_msg));
        break;

      //    case F1AP_SETUP_RESPONSE: // This is from RRC
      //    CU_send_F1_SETUP_RESPONSE(instance, *f1ap_setup_ind, &(F1AP_SETUP_RESP) f1ap_setup_resp)
      //        break;

      //    case F1AP_SETUP_FAILURE: // This is from RRC
      //    CU_send_F1_SETUP_FAILURE(instance, *f1ap_setup_ind, &(F1AP_SETUP_FAILURE) f1ap_setup_failure)
      //       break;

      case TERMINATE_MESSAGE:
        LOG_W(F1AP, " *** Exiting F1AP thread\n");
        itti_exit_task();
        break;

      default:
        LOG_E(F1AP, "CU Received unhandled message: %d:%s\n",
              ITTI_MSG_ID(received_msg), ITTI_MSG_NAME(received_msg));
        break;
    } // switch

    result = itti_free (ITTI_MSG_ORIGIN_ID(received_msg), received_msg);
    AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
    received_msg = NULL;
  } // while

  return NULL;
}