/* * 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 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *------------------------------------------------------------------------------- * For more information about the OpenAirInterface (OAI) Software Alliance: * contact@openairinterface.org */ /*! \file x2ap_eNB_handler.c * \brief x2ap handler procedures for eNB * \author Konstantinos Alexandris <Konstantinos.Alexandris@eurecom.fr>, Cedric Roux <Cedric.Roux@eurecom.fr>, Navid Nikaein <Navid.Nikaein@eurecom.fr> * \date 2018 * \version 1.0 */ #include <stdint.h> #include "intertask_interface.h" #include "asn1_conversions.h" #include "x2ap_common.h" #include "x2ap_eNB_defs.h" #include "x2ap_eNB_handler.h" #include "x2ap_eNB_decoder.h" #include "x2ap_ids.h" #include "x2ap_eNB_management_procedures.h" #include "x2ap_eNB_generate_messages.h" #include "msc.h" #include "assertions.h" #include "conversions.h" static int x2ap_eNB_handle_x2_setup_request (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu); static int x2ap_eNB_handle_x2_setup_response (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu); static int x2ap_eNB_handle_x2_setup_failure (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu); static int x2ap_eNB_handle_handover_preparation (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu); static int x2ap_eNB_handle_handover_response (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu); static int x2ap_eNB_handle_ue_context_release (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu); static int x2ap_eNB_handle_handover_cancel (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu); /* Handlers matrix. Only eNB related procedure present here */ x2ap_message_decoded_callback x2ap_messages_callback[][3] = { { x2ap_eNB_handle_handover_preparation, x2ap_eNB_handle_handover_response, 0 }, /* handoverPreparation */ { x2ap_eNB_handle_handover_cancel, 0, 0 }, /* handoverCancel */ { 0, 0, 0 }, /* loadIndication */ { 0, 0, 0 }, /* errorIndication */ { 0, 0, 0 }, /* snStatusTransfer */ { x2ap_eNB_handle_ue_context_release, 0, 0 }, /* uEContextRelease */ { x2ap_eNB_handle_x2_setup_request, x2ap_eNB_handle_x2_setup_response, x2ap_eNB_handle_x2_setup_failure }, /* x2Setup */ { 0, 0, 0 }, /* reset */ { 0, 0, 0 }, /* eNBConfigurationUpdate */ { 0, 0, 0 }, /* resourceStatusReportingInitiation */ { 0, 0, 0 }, /* resourceStatusReporting */ { 0, 0, 0 }, /* privateMessage */ { 0, 0, 0 }, /* mobilitySettingsChange */ { 0, 0, 0 }, /* rLFIndication */ { 0, 0, 0 }, /* handoverReport */ { 0, 0, 0 }, /* cellActivation */ { 0, 0, 0 }, /* x2Release */ { 0, 0, 0 }, /* x2APMessageTransfer */ { 0, 0, 0 }, /* x2Removal */ { 0, 0, 0 }, /* seNBAdditionPreparation */ { 0, 0, 0 }, /* seNBReconfigurationCompletion */ { 0, 0, 0 }, /* meNBinitiatedSeNBModificationPreparation */ { 0, 0, 0 }, /* seNBinitiatedSeNBModification */ { 0, 0, 0 }, /* meNBinitiatedSeNBRelease */ { 0, 0, 0 }, /* seNBinitiatedSeNBRelease */ { 0, 0, 0 }, /* seNBCounterCheck */ { 0, 0, 0 } /* retrieveUEContext */ }; char *x2ap_direction2String(int x2ap_dir) { static char *x2ap_direction_String[] = { "", /* Nothing */ "Originating message", /* originating message */ "Successfull outcome", /* successfull outcome */ "UnSuccessfull outcome", /* successfull outcome */ }; return(x2ap_direction_String[x2ap_dir]); } void x2ap_handle_x2_setup_message(x2ap_eNB_instance_t *instance_p, x2ap_eNB_data_t *enb_desc_p, int sctp_shutdown) { if (sctp_shutdown) { /* A previously connected eNB has been shutdown */ /* TODO check if it was used by some eNB and send a message to inform these eNB if there is no more associated eNB */ if (enb_desc_p->state == X2AP_ENB_STATE_CONNECTED) { enb_desc_p->state = X2AP_ENB_STATE_DISCONNECTED; if (instance_p-> x2_target_enb_associated_nb > 0) { /* Decrease associated eNB number */ instance_p-> x2_target_enb_associated_nb --; } /* If there are no more associated eNB, inform eNB app */ if (instance_p->x2_target_enb_associated_nb == 0) { MessageDef *message_p; message_p = itti_alloc_new_message(TASK_X2AP, X2AP_DEREGISTERED_ENB_IND); X2AP_DEREGISTERED_ENB_IND(message_p).nb_x2 = 0; itti_send_msg_to_task(TASK_ENB_APP, instance_p->instance, message_p); } } } else { /* Check that at least one setup message is pending */ DevCheck(instance_p->x2_target_enb_pending_nb > 0, instance_p->instance, instance_p->x2_target_enb_pending_nb, 0); if (instance_p->x2_target_enb_pending_nb > 0) { /* Decrease pending messages number */ instance_p->x2_target_enb_pending_nb --; } /* If there are no more pending messages, inform eNB app */ if (instance_p->x2_target_enb_pending_nb == 0) { MessageDef *message_p; message_p = itti_alloc_new_message(TASK_X2AP, X2AP_REGISTER_ENB_CNF); X2AP_REGISTER_ENB_CNF(message_p).nb_x2 = instance_p->x2_target_enb_associated_nb; itti_send_msg_to_task(TASK_ENB_APP, instance_p->instance, message_p); } } } int x2ap_eNB_handle_message(instance_t instance, uint32_t assoc_id, int32_t stream, const uint8_t *const data, const uint32_t data_length) { X2AP_X2AP_PDU_t pdu; int ret = 0; DevAssert(data != NULL); memset(&pdu, 0, sizeof(pdu)); //printf("Data length received: %d\n", data_length); if (x2ap_eNB_decode_pdu(&pdu, data, data_length) < 0) { X2AP_ERROR("Failed to decode PDU\n"); return -1; } switch (pdu.present) { case X2AP_X2AP_PDU_PR_initiatingMessage: /* Checking procedure Code and direction of message */ if (pdu.choice.initiatingMessage.procedureCode > sizeof(x2ap_messages_callback) / (3 * sizeof( x2ap_message_decoded_callback))) { //|| (pdu.present > X2AP_X2AP_PDU_PR_unsuccessfulOutcome)) { X2AP_ERROR("[SCTP %d] Either procedureCode %ld exceed expected\n", assoc_id, pdu.choice.initiatingMessage.procedureCode); ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_X2AP_X2AP_PDU, &pdu); return -1; } /* No handler present. * This can mean not implemented or no procedure for eNB (wrong direction). */ if (x2ap_messages_callback[pdu.choice.initiatingMessage.procedureCode][pdu.present - 1] == NULL) { X2AP_ERROR("[SCTP %d] No handler for procedureCode %ld in %s\n", assoc_id, pdu.choice.initiatingMessage.procedureCode, x2ap_direction2String(pdu.present - 1)); ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_X2AP_X2AP_PDU, &pdu); return -1; } /* Calling the right handler */ ret = (*x2ap_messages_callback[pdu.choice.initiatingMessage.procedureCode][pdu.present - 1]) (instance, assoc_id, stream, &pdu); break; case X2AP_X2AP_PDU_PR_successfulOutcome: /* Checking procedure Code and direction of message */ if (pdu.choice.successfulOutcome.procedureCode > sizeof(x2ap_messages_callback) / (3 * sizeof( x2ap_message_decoded_callback))) { //|| (pdu.present > X2AP_X2AP_PDU_PR_unsuccessfulOutcome)) { X2AP_ERROR("[SCTP %d] Either procedureCode %ld exceed expected\n", assoc_id, pdu.choice.successfulOutcome.procedureCode); ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_X2AP_X2AP_PDU, &pdu); return -1; } /* No handler present. * This can mean not implemented or no procedure for eNB (wrong direction). */ if (x2ap_messages_callback[pdu.choice.successfulOutcome.procedureCode][pdu.present - 1] == NULL) { X2AP_ERROR("[SCTP %d] No handler for procedureCode %ld in %s\n", assoc_id, pdu.choice.successfulOutcome.procedureCode, x2ap_direction2String(pdu.present - 1)); ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_X2AP_X2AP_PDU, &pdu); return -1; } /* Calling the right handler */ ret = (*x2ap_messages_callback[pdu.choice.successfulOutcome.procedureCode][pdu.present - 1]) (instance, assoc_id, stream, &pdu); break; case X2AP_X2AP_PDU_PR_unsuccessfulOutcome: /* Checking procedure Code and direction of message */ if (pdu.choice.unsuccessfulOutcome.procedureCode > sizeof(x2ap_messages_callback) / (3 * sizeof( x2ap_message_decoded_callback))) { //|| (pdu.present > X2AP_X2AP_PDU_PR_unsuccessfulOutcome)) { X2AP_ERROR("[SCTP %d] Either procedureCode %ld exceed expected\n", assoc_id, pdu.choice.unsuccessfulOutcome.procedureCode); ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_X2AP_X2AP_PDU, &pdu); return -1; } /* No handler present. * This can mean not implemented or no procedure for eNB (wrong direction). */ if (x2ap_messages_callback[pdu.choice.unsuccessfulOutcome.procedureCode][pdu.present - 1] == NULL) { X2AP_ERROR("[SCTP %d] No handler for procedureCode %ld in %s\n", assoc_id, pdu.choice.unsuccessfulOutcome.procedureCode, x2ap_direction2String(pdu.present - 1)); ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_X2AP_X2AP_PDU, &pdu); return -1; } /* Calling the right handler */ ret = (*x2ap_messages_callback[pdu.choice.unsuccessfulOutcome.procedureCode][pdu.present - 1]) (instance, assoc_id, stream, &pdu); break; default: X2AP_ERROR("[SCTP %d] Direction %d exceed expected\n", assoc_id, pdu.present); break; } ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_X2AP_X2AP_PDU, &pdu); return ret; } int x2ap_eNB_handle_x2_setup_request(instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu) { X2AP_X2SetupRequest_t *x2SetupRequest; X2AP_X2SetupRequest_IEs_t *ie; ServedCells__Member *servedCellMember; x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_eNB_data; uint32_t eNB_id = 0; DevAssert (pdu != NULL); x2SetupRequest = &pdu->choice.initiatingMessage.value.choice.X2SetupRequest; /* * We received a new valid X2 Setup Request on a stream != 0. * * * * This should not happen -> reject eNB x2 setup request. */ if (stream != 0) { X2AP_ERROR("Received new x2 setup request on stream != 0\n"); /* * Send a x2 setup failure with protocol cause unspecified */ return x2ap_eNB_generate_x2_setup_failure (instance, assoc_id, X2AP_Cause_PR_protocol, X2AP_CauseProtocol_unspecified, -1); } X2AP_DEBUG("Received a new X2 setup request\n"); X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_X2SetupRequest_IEs_t, ie, x2SetupRequest, X2AP_ProtocolIE_ID_id_GlobalENB_ID, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } else { if (ie->value.choice.GlobalENB_ID.eNB_ID.present == X2AP_ENB_ID_PR_home_eNB_ID) { // Home eNB ID = 28 bits uint8_t *eNB_id_buf = ie->value.choice.GlobalENB_ID.eNB_ID.choice.home_eNB_ID.buf; if (ie->value.choice.GlobalENB_ID.eNB_ID.choice.macro_eNB_ID.size != 28) { //TODO: handle case were size != 28 -> notify ? reject ? } eNB_id = (eNB_id_buf[0] << 20) + (eNB_id_buf[1] << 12) + (eNB_id_buf[2] << 4) + ((eNB_id_buf[3] & 0xf0) >> 4); X2AP_DEBUG("Home eNB id: %07x\n", eNB_id); } else { // Macro eNB = 20 bits uint8_t *eNB_id_buf = ie->value.choice.GlobalENB_ID.eNB_ID.choice.macro_eNB_ID.buf; if (ie->value.choice.GlobalENB_ID.eNB_ID.choice.macro_eNB_ID.size != 20) { //TODO: handle case were size != 20 -> notify ? reject ? } eNB_id = (eNB_id_buf[0] << 12) + (eNB_id_buf[1] << 4) + ((eNB_id_buf[2] & 0xf0) >> 4); X2AP_DEBUG("macro eNB id: %05x\n", eNB_id); } } X2AP_DEBUG("Adding eNB to the list of associated eNBs\n"); if ((x2ap_eNB_data = x2ap_is_eNB_id_in_list (eNB_id)) == NULL) { /* * eNB has not been found in list of associated eNB, * * * * Add it to the tail of list and initialize data */ if ((x2ap_eNB_data = x2ap_is_eNB_assoc_id_in_list (assoc_id)) == NULL) { /* * ?? */ return -1; } else { x2ap_eNB_data->state = X2AP_ENB_STATE_RESETTING; x2ap_eNB_data->eNB_id = eNB_id; } } else { x2ap_eNB_data->state = X2AP_ENB_STATE_RESETTING; /* * eNB has been found in list, consider the x2 setup request as a reset connection, * * * * reseting any previous UE state if sctp association is != than the previous one */ if (x2ap_eNB_data->assoc_id != assoc_id) { /* * ??: Send an overload cause... */ X2AP_ERROR("Rejecting x2 setup request as eNB id %d is already associated to an active sctp association" "Previous known: %d, new one: %d\n", eNB_id, x2ap_eNB_data->assoc_id, assoc_id); x2ap_eNB_generate_x2_setup_failure (instance, assoc_id, X2AP_Cause_PR_protocol, X2AP_CauseProtocol_unspecified, -1); return -1; } /* * TODO: call the reset procedure */ } /* Set proper pci */ X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_X2SetupRequest_IEs_t, ie, x2SetupRequest, X2AP_ProtocolIE_ID_id_ServedCells, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } if (ie->value.choice.ServedCells.list.count > 0) { x2ap_eNB_data->num_cc = ie->value.choice.ServedCells.list.count; for (int i=0; i<ie->value.choice.ServedCells.list.count;i++) { servedCellMember = (ServedCells__Member *)ie->value.choice.ServedCells.list.array[i]; x2ap_eNB_data->Nid_cell[i] = servedCellMember->servedCellInfo.pCI; } } instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); return x2ap_eNB_generate_x2_setup_response(instance_p, x2ap_eNB_data); } static int x2ap_eNB_handle_x2_setup_response(instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu) { X2AP_X2SetupResponse_t *x2SetupResponse; X2AP_X2SetupResponse_IEs_t *ie; ServedCells__Member *servedCellMember; x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_eNB_data; uint32_t eNB_id = 0; DevAssert (pdu != NULL); x2SetupResponse = &pdu->choice.successfulOutcome.value.choice.X2SetupResponse; /* * We received a new valid X2 Setup Response on a stream != 0. * * * * This should not happen -> reject eNB x2 setup response. */ if (stream != 0) { X2AP_ERROR("Received new x2 setup response on stream != 0\n"); } if ((x2ap_eNB_data = x2ap_get_eNB(NULL, assoc_id, 0)) == NULL) { X2AP_ERROR("[SCTP %d] Received X2 setup response for non existing " "eNB context\n", assoc_id); return -1; } X2AP_DEBUG("Received a new X2 setup response\n"); X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_X2SetupResponse_IEs_t, ie, x2SetupResponse, X2AP_ProtocolIE_ID_id_GlobalENB_ID, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } if (ie->value.choice.GlobalENB_ID.eNB_ID.present == X2AP_ENB_ID_PR_home_eNB_ID) { // Home eNB ID = 28 bits uint8_t *eNB_id_buf = ie->value.choice.GlobalENB_ID.eNB_ID.choice.home_eNB_ID.buf; if (ie->value.choice.GlobalENB_ID.eNB_ID.choice.macro_eNB_ID.size != 28) { //TODO: handle case were size != 28 -> notify ? reject ? } eNB_id = (eNB_id_buf[0] << 20) + (eNB_id_buf[1] << 12) + (eNB_id_buf[2] << 4) + ((eNB_id_buf[3] & 0xf0) >> 4); X2AP_DEBUG("Home eNB id: %07x\n", eNB_id); } else { // Macro eNB = 20 bits uint8_t *eNB_id_buf = ie->value.choice.GlobalENB_ID.eNB_ID.choice.macro_eNB_ID.buf; if (ie->value.choice.GlobalENB_ID.eNB_ID.choice.macro_eNB_ID.size != 20) { //TODO: handle case were size != 20 -> notify ? reject ? } eNB_id = (eNB_id_buf[0] << 12) + (eNB_id_buf[1] << 4) + ((eNB_id_buf[2] & 0xf0) >> 4); X2AP_DEBUG("macro eNB id: %05x\n", eNB_id); } X2AP_DEBUG("Adding eNB to the list of associated eNBs\n"); if ((x2ap_eNB_data = x2ap_is_eNB_id_in_list (eNB_id)) == NULL) { /* * eNB has not been found in list of associated eNB, * * * * Add it to the tail of list and initialize data */ if ((x2ap_eNB_data = x2ap_is_eNB_assoc_id_in_list (assoc_id)) == NULL) { /* * ??: Send an overload cause... */ return -1; } else { x2ap_eNB_data->state = X2AP_ENB_STATE_RESETTING; x2ap_eNB_data->eNB_id = eNB_id; } } else { x2ap_eNB_data->state = X2AP_ENB_STATE_RESETTING; /* * TODO: call the reset procedure */ } /* Set proper pci */ X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_X2SetupResponse_IEs_t, ie, x2SetupResponse, X2AP_ProtocolIE_ID_id_ServedCells, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } if (ie->value.choice.ServedCells.list.count > 0) { x2ap_eNB_data->num_cc = ie->value.choice.ServedCells.list.count; for (int i=0; i<ie->value.choice.ServedCells.list.count;i++) { servedCellMember = (ServedCells__Member *)ie->value.choice.ServedCells.list.array[i]; x2ap_eNB_data->Nid_cell[i] = servedCellMember->servedCellInfo.pCI; } } /* Optionaly set the target eNB name */ /* The association is now ready as source and target eNBs know parameters of each other. * Mark the association as connected. */ x2ap_eNB_data->state = X2AP_ENB_STATE_READY; instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); instance_p->x2_target_enb_associated_nb ++; x2ap_handle_x2_setup_message(instance_p, x2ap_eNB_data, 0); return 0; } static int x2ap_eNB_handle_x2_setup_failure(instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu) { X2AP_X2SetupFailure_t *x2SetupFailure; X2AP_X2SetupFailure_IEs_t *ie; x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_eNB_data; DevAssert(pdu != NULL); x2SetupFailure = &pdu->choice.unsuccessfulOutcome.value.choice.X2SetupFailure; /* * We received a new valid X2 Setup Failure on a stream != 0. * * * * This should not happen -> reject eNB x2 setup failure. */ if (stream != 0) { X2AP_WARN("[SCTP %d] Received x2 setup failure on stream != 0 (%d)\n", assoc_id, stream); } if ((x2ap_eNB_data = x2ap_get_eNB (NULL, assoc_id, 0)) == NULL) { X2AP_ERROR("[SCTP %d] Received X2 setup failure for non existing " "eNB context\n", assoc_id); return -1; } X2AP_DEBUG("Received a new X2 setup failure\n"); X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_X2SetupFailure_IEs_t, ie, x2SetupFailure, X2AP_ProtocolIE_ID_id_Cause, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } // need a FSM to handle all cases if ((ie->value.choice.Cause.present == X2AP_Cause_PR_misc) && (ie->value.choice.Cause.choice.misc == X2AP_CauseMisc_unspecified)) { X2AP_WARN("Received X2 setup failure for eNB ... eNB is not ready\n"); } else { X2AP_ERROR("Received x2 setup failure for eNB... please check your parameters\n"); } x2ap_eNB_data->state = X2AP_ENB_STATE_WAITING; instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); x2ap_handle_x2_setup_message(instance_p, x2ap_eNB_data, 0); return 0; } static int x2ap_eNB_handle_handover_preparation (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu) { X2AP_HandoverRequest_t *x2HandoverRequest; X2AP_HandoverRequest_IEs_t *ie; X2AP_E_RABs_ToBeSetup_ItemIEs_t *e_RABS_ToBeSetup_ItemIEs; X2AP_E_RABs_ToBeSetup_Item_t *e_RABs_ToBeSetup_Item; x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_eNB_data; MessageDef *msg; int ue_id; DevAssert (pdu != NULL); x2HandoverRequest = &pdu->choice.initiatingMessage.value.choice.HandoverRequest; if (stream == 0) { X2AP_ERROR ("Received new x2 handover request on stream == 0\n"); /* TODO: send a x2 failure response */ return 0; } X2AP_DEBUG ("Received a new X2 handover request\n"); x2ap_eNB_data = x2ap_get_eNB(NULL, assoc_id, 0); DevAssert(x2ap_eNB_data != NULL); instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); msg = itti_alloc_new_message(TASK_X2AP, X2AP_HANDOVER_REQ); X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverRequest_IEs_t, ie, x2HandoverRequest, X2AP_ProtocolIE_ID_id_Old_eNB_UE_X2AP_ID, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } /* allocate a new X2AP UE ID */ ue_id = x2ap_allocate_new_id(&instance_p->id_manager); if (ue_id == -1) { X2AP_ERROR("could not allocate a new X2AP UE ID\n"); /* TODO: cancel handover: send HO preparation failure to source eNB */ exit(1); } /* rnti is unknown yet, must not be set to -1, 0 is fine */ x2ap_set_ids(&instance_p->id_manager, ue_id, 0, ie->value.choice.UE_X2AP_ID, ue_id); x2ap_id_set_state(&instance_p->id_manager, ue_id, X2ID_STATE_TARGET); X2AP_HANDOVER_REQ(msg).x2_id = ue_id; //X2AP_HANDOVER_REQ(msg).target_physCellId = measResults2->measResultNeighCells->choice. //measResultListEUTRA.list.array[ncell_index]->physCellId; X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverRequest_IEs_t, ie, x2HandoverRequest, X2AP_ProtocolIE_ID_id_GUMMEI_ID, true); TBCD_TO_MCC_MNC(&ie->value.choice.ECGI.pLMN_Identity, X2AP_HANDOVER_REQ(msg).ue_gummei.mcc, X2AP_HANDOVER_REQ(msg).ue_gummei.mnc, X2AP_HANDOVER_REQ(msg).ue_gummei.mnc_len); OCTET_STRING_TO_INT8(&ie->value.choice.GUMMEI.mME_Code, X2AP_HANDOVER_REQ(msg).ue_gummei.mme_code); OCTET_STRING_TO_INT16(&ie->value.choice.GUMMEI.gU_Group_ID.mME_Group_ID, X2AP_HANDOVER_REQ(msg).ue_gummei.mme_group_id); X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverRequest_IEs_t, ie, x2HandoverRequest, X2AP_ProtocolIE_ID_id_UE_ContextInformation, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } X2AP_HANDOVER_REQ(msg).mme_ue_s1ap_id = ie->value.choice.UE_ContextInformation.mME_UE_S1AP_ID; /* TODO: properly store Target Cell ID */ X2AP_HANDOVER_REQ(msg).target_assoc_id = assoc_id; X2AP_HANDOVER_REQ(msg).security_capabilities.encryption_algorithms = BIT_STRING_to_uint16(&ie->value.choice.UE_ContextInformation.uESecurityCapabilities.encryptionAlgorithms); X2AP_HANDOVER_REQ(msg).security_capabilities.integrity_algorithms = BIT_STRING_to_uint16(&ie->value.choice.UE_ContextInformation.uESecurityCapabilities.integrityProtectionAlgorithms); //X2AP_HANDOVER_REQ(msg).ue_ambr=ue_context_pP->ue_context.ue_ambr; if ((ie->value.choice.UE_ContextInformation.aS_SecurityInformation.key_eNodeB_star.buf) && (ie->value.choice.UE_ContextInformation.aS_SecurityInformation.key_eNodeB_star.size == 32)) { memcpy(X2AP_HANDOVER_REQ(msg).kenb, ie->value.choice.UE_ContextInformation.aS_SecurityInformation.key_eNodeB_star.buf, 32); X2AP_HANDOVER_REQ(msg).kenb_ncc = ie->value.choice.UE_ContextInformation.aS_SecurityInformation.nextHopChainingCount; } else { X2AP_WARN ("Size of eNB key star does not match the expected value\n"); } if (ie->value.choice.UE_ContextInformation.e_RABs_ToBeSetup_List.list.count > 0) { X2AP_HANDOVER_REQ(msg).nb_e_rabs_tobesetup = ie->value.choice.UE_ContextInformation.e_RABs_ToBeSetup_List.list.count; for (int i=0;i<ie->value.choice.UE_ContextInformation.e_RABs_ToBeSetup_List.list.count;i++) { e_RABS_ToBeSetup_ItemIEs = (X2AP_E_RABs_ToBeSetup_ItemIEs_t *) ie->value.choice.UE_ContextInformation.e_RABs_ToBeSetup_List.list.array[i]; e_RABs_ToBeSetup_Item = &e_RABS_ToBeSetup_ItemIEs->value.choice.E_RABs_ToBeSetup_Item; X2AP_HANDOVER_REQ(msg).e_rabs_tobesetup[i].e_rab_id = e_RABs_ToBeSetup_Item->e_RAB_ID ; memcpy(X2AP_HANDOVER_REQ(msg).e_rabs_tobesetup[i].eNB_addr.buffer, e_RABs_ToBeSetup_Item->uL_GTPtunnelEndpoint.transportLayerAddress.buf, e_RABs_ToBeSetup_Item->uL_GTPtunnelEndpoint.transportLayerAddress.size); X2AP_HANDOVER_REQ(msg).e_rabs_tobesetup[i].eNB_addr.length = e_RABs_ToBeSetup_Item->uL_GTPtunnelEndpoint.transportLayerAddress.size * 8 - e_RABs_ToBeSetup_Item->uL_GTPtunnelEndpoint.transportLayerAddress.bits_unused; OCTET_STRING_TO_INT32(&e_RABs_ToBeSetup_Item->uL_GTPtunnelEndpoint.gTP_TEID, X2AP_HANDOVER_REQ(msg).e_rabs_tobesetup[i].gtp_teid); X2AP_HANDOVER_REQ(msg).e_rab_param[i].qos.qci = e_RABs_ToBeSetup_Item->e_RAB_Level_QoS_Parameters.qCI; X2AP_HANDOVER_REQ(msg).e_rab_param[i].qos.allocation_retention_priority.priority_level = e_RABs_ToBeSetup_Item->e_RAB_Level_QoS_Parameters.allocationAndRetentionPriority.priorityLevel; X2AP_HANDOVER_REQ(msg).e_rab_param[i].qos.allocation_retention_priority.pre_emp_capability = e_RABs_ToBeSetup_Item->e_RAB_Level_QoS_Parameters.allocationAndRetentionPriority.pre_emptionCapability; X2AP_HANDOVER_REQ(msg).e_rab_param[i].qos.allocation_retention_priority.pre_emp_vulnerability = e_RABs_ToBeSetup_Item->e_RAB_Level_QoS_Parameters.allocationAndRetentionPriority.pre_emptionVulnerability; } } else { X2AP_ERROR ("Can't decode the e_RABs_ToBeSetup_List \n"); } X2AP_RRC_Context_t *c = &ie->value.choice.UE_ContextInformation.rRC_Context; if (c->size > 1024 /* TODO: this is the size of rrc_buffer in struct x2ap_handover_req_ack_s*/) { printf("%s:%d: fatal: buffer too big\n", __FILE__, __LINE__); abort(); } memcpy(X2AP_HANDOVER_REQ(msg).rrc_buffer, c->buf, c->size); X2AP_HANDOVER_REQ(msg).rrc_buffer_size = c->size; itti_send_msg_to_task(TASK_RRC_ENB, instance_p->instance, msg); return 0; } static int x2ap_eNB_handle_handover_response (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu) { X2AP_HandoverRequestAcknowledge_t *x2HandoverRequestAck; X2AP_HandoverRequestAcknowledge_IEs_t *ie; x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_eNB_data; MessageDef *msg; int ue_id; int id_source; int id_target; int rnti; DevAssert (pdu != NULL); x2HandoverRequestAck = &pdu->choice.successfulOutcome.value.choice.HandoverRequestAcknowledge; if (stream == 0) { X2AP_ERROR ("Received new x2 handover response on stream == 0\n"); /* TODO: send a x2 failure response */ return 0; } X2AP_DEBUG ("Received a new X2 handover response\n"); x2ap_eNB_data = x2ap_get_eNB(NULL, assoc_id, 0); DevAssert(x2ap_eNB_data != NULL); instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); msg = itti_alloc_new_message(TASK_X2AP, X2AP_HANDOVER_REQ_ACK); X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverRequestAcknowledge_IEs_t, ie, x2HandoverRequestAck, X2AP_ProtocolIE_ID_id_Old_eNB_UE_X2AP_ID, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } id_source = ie->value.choice.UE_X2AP_ID; X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverRequestAcknowledge_IEs_t, ie, x2HandoverRequestAck, X2AP_ProtocolIE_ID_id_New_eNB_UE_X2AP_ID, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } id_target = ie->value.choice.UE_X2AP_ID_1; ue_id = id_source; if (ue_id != x2ap_find_id_from_id_source(&instance_p->id_manager, id_source)) { X2AP_WARN("incorrect/unknown X2AP IDs for UE (old ID %d new ID %d), ignoring handover response\n", id_source, id_target); return 0; } rnti = x2ap_id_get_rnti(&instance_p->id_manager, ue_id); /* id_target is a new information, store it */ x2ap_set_ids(&instance_p->id_manager, ue_id, rnti, id_source, id_target); x2ap_id_set_state(&instance_p->id_manager, ue_id, X2ID_STATE_SOURCE_OVERALL); x2ap_set_reloc_overall_timer(&instance_p->id_manager, ue_id, x2ap_timer_get_tti(&instance_p->timers)); X2AP_HANDOVER_REQ_ACK(msg).rnti = rnti; X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverRequestAcknowledge_IEs_t, ie, x2HandoverRequestAck, X2AP_ProtocolIE_ID_id_TargeteNBtoSource_eNBTransparentContainer, true); X2AP_TargeteNBtoSource_eNBTransparentContainer_t *c = &ie->value.choice.TargeteNBtoSource_eNBTransparentContainer; if (c->size > 1024 /* TODO: this is the size of rrc_buffer in struct x2ap_handover_req_ack_s*/) { printf("%s:%d: fatal: buffer too big\n", __FILE__, __LINE__); abort(); } memcpy(X2AP_HANDOVER_REQ_ACK(msg).rrc_buffer, c->buf, c->size); X2AP_HANDOVER_REQ_ACK(msg).rrc_buffer_size = c->size; itti_send_msg_to_task(TASK_RRC_ENB, instance_p->instance, msg); return 0; } static int x2ap_eNB_handle_ue_context_release (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu) { X2AP_UEContextRelease_t *x2UEContextRelease; X2AP_UEContextRelease_IEs_t *ie; x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_eNB_data; MessageDef *msg; int ue_id; int id_source; int id_target; DevAssert (pdu != NULL); x2UEContextRelease = &pdu->choice.initiatingMessage.value.choice.UEContextRelease; if (stream == 0) { X2AP_ERROR ("Received new x2 ue context release on stream == 0\n"); /* TODO: send a x2 failure response */ return 0; } X2AP_DEBUG ("Received a new X2 ue context release\n"); x2ap_eNB_data = x2ap_get_eNB(NULL, assoc_id, 0); DevAssert(x2ap_eNB_data != NULL); instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); msg = itti_alloc_new_message(TASK_X2AP, X2AP_UE_CONTEXT_RELEASE); X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_UEContextRelease_IEs_t, ie, x2UEContextRelease, X2AP_ProtocolIE_ID_id_Old_eNB_UE_X2AP_ID, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } id_source = ie->value.choice.UE_X2AP_ID; X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_UEContextRelease_IEs_t, ie, x2UEContextRelease, X2AP_ProtocolIE_ID_id_New_eNB_UE_X2AP_ID, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } id_target = ie->value.choice.UE_X2AP_ID_1; ue_id = id_source; if (ue_id != x2ap_find_id_from_id_source(&instance_p->id_manager, id_source)) { X2AP_WARN("incorrect/unknown X2AP IDs for UE (old ID %d new ID %d), ignoring UE context release\n", id_source, id_target); return 0; } if (id_target != x2ap_id_get_id_target(&instance_p->id_manager, ue_id)) { X2AP_ERROR("UE context release: bad id_target for UE %x (id_source %d) expected %d got %d, ignoring message\n", x2ap_id_get_rnti(&instance_p->id_manager, ue_id), id_source, x2ap_id_get_id_target(&instance_p->id_manager, ue_id), id_target); return 0; } X2AP_UE_CONTEXT_RELEASE(msg).rnti = x2ap_id_get_rnti(&instance_p->id_manager, ue_id); itti_send_msg_to_task(TASK_RRC_ENB, instance_p->instance, msg); x2ap_release_id(&instance_p->id_manager, ue_id); return 0; } static int x2ap_eNB_handle_handover_cancel (instance_t instance, uint32_t assoc_id, uint32_t stream, X2AP_X2AP_PDU_t *pdu) { X2AP_HandoverCancel_t *x2HandoverCancel; X2AP_HandoverCancel_IEs_t *ie; x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_eNB_data; MessageDef *msg; int ue_id; int id_source; int id_target; x2ap_handover_cancel_cause_t cause; DevAssert (pdu != NULL); x2HandoverCancel = &pdu->choice.initiatingMessage.value.choice.HandoverCancel; if (stream == 0) { X2AP_ERROR ("Received new x2 handover cancel on stream == 0\n"); return 0; } X2AP_DEBUG ("Received a new X2 handover cancel\n"); x2ap_eNB_data = x2ap_get_eNB(NULL, assoc_id, 0); DevAssert(x2ap_eNB_data != NULL); instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverCancel_IEs_t, ie, x2HandoverCancel, X2AP_ProtocolIE_ID_id_Old_eNB_UE_X2AP_ID, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } id_source = ie->value.choice.UE_X2AP_ID; X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverCancel_IEs_t, ie, x2HandoverCancel, X2AP_ProtocolIE_ID_id_New_eNB_UE_X2AP_ID, false); if (ie == NULL ) { X2AP_INFO("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); id_target = -1; } else id_target = ie->value.choice.UE_X2AP_ID_1; X2AP_FIND_PROTOCOLIE_BY_ID(X2AP_HandoverCancel_IEs_t, ie, x2HandoverCancel, X2AP_ProtocolIE_ID_id_Cause, true); if (ie == NULL ) { X2AP_ERROR("%s %d: ie is a NULL pointer \n",__FILE__,__LINE__); return -1; } if (ie->value.present != X2AP_HandoverCancel_IEs__value_PR_Cause || ie->value.choice.Cause.present != X2AP_Cause_PR_radioNetwork || !(ie->value.choice.Cause.choice.radioNetwork == X2AP_CauseRadioNetwork_trelocprep_expiry || ie->value.choice.Cause.choice.radioNetwork == X2AP_CauseRadioNetwork_tx2relocoverall_expiry)) { X2AP_ERROR("%s %d: Cause not supported (only T_reloc_prep and TX2_reloc_overall handled)\n",__FILE__,__LINE__); return -1; } switch (ie->value.choice.Cause.choice.radioNetwork) { case X2AP_CauseRadioNetwork_trelocprep_expiry: cause = X2AP_T_RELOC_PREP_TIMEOUT; break; case X2AP_CauseRadioNetwork_tx2relocoverall_expiry: cause = X2AP_TX2_RELOC_OVERALL_TIMEOUT; break; default: /* can't come here */ exit(1); } ue_id = x2ap_find_id_from_id_source(&instance_p->id_manager, id_source); if (ue_id == -1) { X2AP_WARN("Handover cancel: UE not found (id_source = %d), ignoring message\n", id_source); return 0; } if (id_target != -1 && id_target != x2ap_id_get_id_target(&instance_p->id_manager, ue_id)) { X2AP_ERROR("Handover cancel: bad id_target for UE %x (id_source %d) expected %d got %d\n", x2ap_id_get_rnti(&instance_p->id_manager, ue_id), id_source, x2ap_id_get_id_target(&instance_p->id_manager, ue_id), id_target); exit(1); } msg = itti_alloc_new_message(TASK_X2AP, X2AP_HANDOVER_CANCEL); X2AP_HANDOVER_CANCEL(msg).rnti = x2ap_id_get_rnti(&instance_p->id_manager, ue_id); X2AP_HANDOVER_CANCEL(msg).cause = cause; itti_send_msg_to_task(TASK_RRC_ENB, instance_p->instance, msg); x2ap_release_id(&instance_p->id_manager, ue_id); return 0; }