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openairinterface5g/openair2/E1AP/e1ap.c
T
Guido Casati 9311931e90 Introduce handler/callback for Bearer Context Setup Failure in stack 
This commit does not introduce the callback on the CU-UP to trigger
a Bearer Context Setup Failure when the setup of the bearer context was unsuccessful.
This should be handled properly in the stack e.g. in e1_bearer_context_setup (a comment
in the code says "We assume all DRBs to setup have been setup successfully, so we always
send successful outcome in response and no failed DRBs")
2025-04-30 11:57:12 +02:00

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/*
* 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
*
* Author and copyright: Laurent Thomas, open-cells.com
*
* 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
*/
#include "e1ap.h"
#include "e1ap_common.h"
#include "gnb_config.h"
#include "openair2/SDAP/nr_sdap/nr_sdap_entity.h"
#include "openair3/UTILS/conversions.h"
#include "openair2/RRC/NR/MESSAGES/asn1_msg.h"
#include "common/openairinterface5g_limits.h"
#include "common/utils/LOG/log.h"
#include "openair2/F1AP/f1ap_common.h"
#include "e1ap_default_values.h"
#include "gtp_itf.h"
#include "openair2/LAYER2/nr_pdcp/cucp_cuup_handler.h"
#include "lib/e1ap_bearer_context_management.h"
#include "lib/e1ap_interface_management.h"
#define E1AP_NUM_MSG_HANDLERS 14
typedef int (*e1ap_message_processing_t)(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *inst, const E1AP_E1AP_PDU_t *message_p);
/**
* @brief E1AP messages handlers
*/
const e1ap_message_processing_t e1ap_message_processing[E1AP_NUM_MSG_HANDLERS][3] = {
{0, 0, 0}, /* Reset */
{0, 0, 0}, /* ErrorIndication */
{0, 0, 0}, /* privateMessage */
{e1apCUCP_handle_SETUP_REQUEST, e1apCUUP_handle_SETUP_RESPONSE, e1apCUUP_handle_SETUP_FAILURE}, /* gNBCUUPE1Setup */
{0, 0, 0}, /* gNBCUCPE1Setup */
{0, 0, 0}, /* gNBCUUPConfigurationUpdate */
{0, 0, 0}, /* gNBCUCPConfigurationUpdate */
{0, 0, 0}, /* E1Release */
{e1apCUUP_handle_BEARER_CONTEXT_SETUP_REQUEST,
e1apCUCP_handle_BEARER_CONTEXT_SETUP_RESPONSE,
e1apCUCP_handle_BEARER_CONTEXT_SETUP_FAILURE}, /* bearerContextSetup */
{e1apCUUP_handle_BEARER_CONTEXT_MODIFICATION_REQUEST,
e1apCUCP_handle_BEARER_CONTEXT_MODIFICATION_RESPONSE,
0}, /* bearerContextModification */
{0, 0, 0}, /* bearerContextModificationRequired */
{e1apCUUP_handle_BEARER_CONTEXT_RELEASE_COMMAND, e1apCUCP_handle_BEARER_CONTEXT_RELEASE_COMPLETE, 0}, /* bearerContextRelease */
{0, 0, 0}, /* bearerContextReleaseRequired */
{0, 0, 0} /* bearerContextInactivityNotification */
};
const char *const e1ap_direction2String(int e1ap_dir)
{
static const char *e1ap_direction_String[] = {
"", /* Nothing */
"Initiating message", /* initiating message */
"Successfull outcome", /* successfull outcome */
"UnSuccessfull outcome", /* successfull outcome */
};
return (e1ap_direction_String[e1ap_dir]);
}
static int e1ap_handle_message(instance_t instance, sctp_assoc_t assoc_id, const uint8_t *const data, const uint32_t data_length)
{
E1AP_E1AP_PDU_t pdu = {0};
int ret;
DevAssert(data != NULL);
if (e1ap_decode_pdu(&pdu, data, data_length) < 0) {
LOG_E(E1AP, "Failed to decode PDU\n");
return -1;
}
const E1AP_ProcedureCode_t procedureCode = pdu.choice.initiatingMessage->procedureCode;
/* Checking procedure Code and direction of message */
if ((procedureCode >= E1AP_NUM_MSG_HANDLERS) || (pdu.present > E1AP_E1AP_PDU_PR_unsuccessfulOutcome)
|| (pdu.present <= E1AP_E1AP_PDU_PR_NOTHING)) {
LOG_E(E1AP, "[SCTP %d] Either procedureCode %ld or direction %d exceed expected\n", assoc_id, procedureCode, pdu.present);
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_E1AP_E1AP_PDU, &pdu);
return -1;
}
if (e1ap_message_processing[procedureCode][pdu.present - 1] == NULL) {
// No handler present. This can mean not implemented or no procedure for eNB
// (wrong direction).
LOG_E(E1AP,
"[SCTP %d] No handler for procedureCode %ld in %s\n",
assoc_id,
procedureCode,
e1ap_direction2String(pdu.present - 1));
ret = -1;
} else {
/* Calling the right handler */
LOG_D(E1AP, "Calling handler with instance %ld\n", instance);
ret = (*e1ap_message_processing[procedureCode][pdu.present - 1])(assoc_id, getCxtE1(instance), &pdu);
}
ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_E1AP_E1AP_PDU, &pdu);
return ret;
}
static void e1_task_handle_sctp_data_ind(instance_t instance, sctp_data_ind_t *sctp_data_ind)
{
int result;
DevAssert(sctp_data_ind != NULL);
e1ap_handle_message(instance, sctp_data_ind->assoc_id, 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);
}
int e1ap_send_RESET(bool isCu, sctp_assoc_t assoc_id, E1AP_Reset_t *Reset)
{
AssertFatal(false, "Not implemented yet\n");
E1AP_E1AP_PDU_t pdu = {0};
return e1ap_encode_send(isCu, assoc_id, &pdu, 0, __func__);
}
int e1ap_send_RESET_ACKNOWLEDGE(instance_t instance, E1AP_Reset_t *Reset)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1ap_handle_RESET(instance_t instance, sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1ap_handle_RESET_ACKNOWLEDGE(instance_t instance, sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
/*
Error Indication
*/
int e1ap_handle_ERROR_INDICATION(instance_t instance, sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1ap_send_ERROR_INDICATION(instance_t instance, E1AP_ErrorIndication_t *ErrorIndication)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
void e1ap_send_SETUP_RESPONSE(sctp_assoc_t assoc_id, const e1ap_setup_resp_t *e1ap_setup_resp)
{
E1AP_E1AP_PDU_t *pdu = encode_e1ap_cuup_setup_response(e1ap_setup_resp);
e1ap_encode_send(CPtype, assoc_id, pdu, 0, __func__);
}
/**
* @brief E1 Setup Failure ASN1 messager encoder
*/
static void e1apCUCP_send_SETUP_FAILURE(sctp_assoc_t assoc_id, const e1ap_setup_fail_t *msg)
{
LOG_D(E1AP, "CU-CP: Encoding E1AP Setup Failure for transac_id %ld...\n", msg->transac_id);
E1AP_E1AP_PDU_t *pdu = encode_e1ap_cuup_setup_failure(msg);
e1ap_encode_send(CPtype, assoc_id, pdu, 0, __func__);
}
int e1apCUCP_handle_SETUP_REQUEST(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *inst, const E1AP_E1AP_PDU_t *pdu)
{
DevAssert(pdu != NULL);
/* Create ITTI message and send to queue */
MessageDef *msg_p = itti_alloc_new_message(TASK_CUCP_E1, 0 /*unused by callee*/, E1AP_SETUP_REQ);
// Decode E1 CU-UP Setup Request
if (!decode_e1ap_cuup_setup_request(pdu, &E1AP_SETUP_REQ(msg_p))) {
free_e1ap_cuup_setup_request(&E1AP_SETUP_REQ(msg_p));
return -1;
}
msg_p->ittiMsgHeader.originInstance = assoc_id;
if (E1AP_SETUP_REQ(msg_p).supported_plmns > 0) {
itti_send_msg_to_task(TASK_RRC_GNB, 0 /*unused by callee*/, msg_p);
} else {
e1ap_cause_t cause = { .type = E1AP_CAUSE_PROTOCOL, .value = E1AP_PROTOCOL_CAUSE_SEMANTIC_ERROR};
e1ap_setup_fail_t setup_fail = {.transac_id = E1AP_SETUP_REQ(msg_p).transac_id, .cause = cause};
e1apCUCP_send_SETUP_FAILURE(assoc_id, &setup_fail);
itti_free(TASK_CUCP_E1, msg_p);
return -1;
}
return 0;
}
int e1apCUUP_handle_SETUP_RESPONSE(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *inst, const E1AP_E1AP_PDU_t *pdu)
{
// Decode E1 CU-UP Setup Response
e1ap_setup_resp_t out = {0};
if (!decode_e1ap_cuup_setup_response(pdu, &out)) {
free_e1ap_cuup_setup_response(&out);
return -1;
}
long old_transaction_id = inst->cuup.setupReq.transac_id;
if (old_transaction_id != out.transac_id) {
LOG_E(E1AP, "Transaction IDs do not match %ld != %ld\n", old_transaction_id, out.transac_id);
free_e1ap_cuup_setup_response(&out);
return -1;
}
free_e1ap_cuup_setup_response(&out);
e1_reset(); // reset all UE contexts, if any: see 38.463 sec 8.2.3
return 0;
}
/**
* @brief E1 Setup Failure ASN1 messager decoder on CU-UP
*/
int e1apCUUP_handle_SETUP_FAILURE(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *inst, const E1AP_E1AP_PDU_t *pdu)
{
LOG_D(E1AP, "CU-UP: Decoding E1AP Setup Failure...\n");
E1AP_GNB_CU_UP_E1SetupFailureIEs_t *ie;
DevAssert(pdu != NULL);
E1AP_GNB_CU_UP_E1SetupFailure_t *in = &pdu->choice.unsuccessfulOutcome->value.choice.GNB_CU_UP_E1SetupFailure;
/* Transaction ID */
F1AP_FIND_PROTOCOLIE_BY_ID(E1AP_GNB_CU_UP_E1SetupFailureIEs_t, ie, in, E1AP_ProtocolIE_ID_id_TransactionID, true);
long transaction_id;
long old_transaction_id = inst->cuup.setupReq.transac_id;
transaction_id = ie->value.choice.TransactionID;
if (old_transaction_id != transaction_id)
LOG_E(E1AP, "Transaction IDs do not match %ld != %ld\n", old_transaction_id, transaction_id);
E1AP_free_transaction_identifier(transaction_id);
/* Cause */
F1AP_FIND_PROTOCOLIE_BY_ID(E1AP_GNB_CU_UP_E1SetupFailureIEs_t, ie, in, E1AP_ProtocolIE_ID_id_Cause, true);
LOG_E(E1AP, "received E1 Setup Failure, please check the CU-CP output and the CU-UP parameters\n");
exit(1);
return 0;
}
static void fill_CONFIGURATION_UPDATE(E1AP_E1AP_PDU_t *pdu)
{
/* Create */
/* 0. pdu Type */
pdu->present = E1AP_E1AP_PDU_PR_initiatingMessage;
asn1cCalloc(pdu->choice.initiatingMessage, msg);
msg->procedureCode = E1AP_ProcedureCode_id_gNB_CU_UP_ConfigurationUpdate;
msg->criticality = E1AP_Criticality_reject;
msg->value.present = E1AP_InitiatingMessage__value_PR_GNB_CU_UP_ConfigurationUpdate;
E1AP_GNB_CU_UP_ConfigurationUpdate_t *out = &pdu->choice.initiatingMessage->value.choice.GNB_CU_UP_ConfigurationUpdate;
/* mandatory */
/* c1. Transaction ID (integer value) */
asn1cSequenceAdd(out->protocolIEs.list, E1AP_GNB_CU_UP_ConfigurationUpdateIEs_t, ieC1);
ieC1->id = E1AP_ProtocolIE_ID_id_TransactionID;
ieC1->criticality = E1AP_Criticality_reject;
ieC1->value.present = E1AP_GNB_CU_UP_ConfigurationUpdateIEs__value_PR_TransactionID;
ieC1->value.choice.TransactionID = 0;//get this from stored transaction IDs in CU
/* mandatory */
/* c2. Supported PLMNs */
asn1cSequenceAdd(out->protocolIEs.list, E1AP_GNB_CU_UP_ConfigurationUpdateIEs_t, ieC2);
ieC2->id = E1AP_ProtocolIE_ID_id_SupportedPLMNs;
ieC2->criticality = E1AP_Criticality_reject;
ieC2->value.present = E1AP_GNB_CU_UP_ConfigurationUpdateIEs__value_PR_SupportedPLMNs_List;
int numSupportedPLMNs = 1;
for (int i = 0; i < numSupportedPLMNs; i++) {
asn1cSequenceAdd(ieC2->value.choice.SupportedPLMNs_List.list, E1AP_SupportedPLMNs_Item_t, supportedPLMN);
/* 5.1 PLMN Identity */
OCTET_STRING_fromBuf(&supportedPLMN->pLMN_Identity, "OAI", strlen("OAI"));
}
/* mandatory */
/* c3. TNLA to remove list */
asn1cSequenceAdd(out->protocolIEs.list, E1AP_GNB_CU_UP_ConfigurationUpdateIEs_t, ieC3);
ieC3->id = E1AP_ProtocolIE_ID_id_GNB_CU_UP_TNLA_To_Remove_List;
ieC3->criticality = E1AP_Criticality_reject;
ieC3->value.present = E1AP_GNB_CU_UP_ConfigurationUpdateIEs__value_PR_GNB_CU_UP_TNLA_To_Remove_List;
int numTNLAtoRemoveList = 1;
for (int i = 0; i < numTNLAtoRemoveList; i++) {
asn1cSequenceAdd(ieC2->value.choice.GNB_CU_UP_TNLA_To_Remove_List.list, E1AP_GNB_CU_UP_TNLA_To_Remove_Item_t, TNLAtoRemove);
TNLAtoRemove->tNLAssociationTransportLayerAddress.present = E1AP_CP_TNL_Information_PR_endpoint_IP_Address;
TRANSPORT_LAYER_ADDRESS_IPv4_TO_BIT_STRING(1234, &TNLAtoRemove->tNLAssociationTransportLayerAddress.choice.endpoint_IP_Address); // TODO: correct me
}
}
/*
E1 configuration update: can be sent in both ways, to be refined
*/
void e1apCUUP_send_CONFIGURATION_UPDATE(sctp_assoc_t assoc_id)
{
E1AP_E1AP_PDU_t pdu = {0};
fill_CONFIGURATION_UPDATE(&pdu);
e1ap_encode_send(UPtype, assoc_id, &pdu, 0, __func__);
}
int e1apCUCP_send_gNB_DU_CONFIGURATION_FAILURE(void)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUCP_send_gNB_DU_CONFIGURATION_UPDATE_ACKNOWLEDGE(void)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUCP_handle_CONFIGURATION_UPDATE(E1AP_E1AP_PDU_t *pdu)
{
/*
E1AP_GNB_CU_UP_E1SetupRequestIEs_t *ie;
DevAssert(pdu != NULL);
E1AP_GNB_CU_UP_E1SetupRequest_t *in = &pdu->choice.initiatingMessage->value.choice.GNB_CU_UP_E1SetupRequest;
*/
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUUP_handle_gNB_DU_CONFIGURATION_UPDATE_ACKNOWLEDGE(sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUUP_handle_gNB_DU_CONFIGURATION_FAILURE(sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
/*
E1 release
*/
int e1ap_send_RELEASE_REQUEST(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1ap_send_RELEASE_ACKNOWLEDGE(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1ap_handle_RELEASE_REQUEST(instance_t instance, sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1ap_handle_RELEASE_ACKNOWLEDGE(instance_t instance, sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
void e1apCUCP_send_BEARER_CONTEXT_SETUP_REQUEST(sctp_assoc_t assoc_id, e1ap_bearer_setup_req_t *const bearerCxt)
{
E1AP_E1AP_PDU_t *pdu = encode_E1_bearer_context_setup_request(bearerCxt);
e1ap_encode_send(CPtype, assoc_id, pdu, 0, __func__);
}
void e1apCUUP_send_BEARER_CONTEXT_SETUP_RESPONSE(sctp_assoc_t assoc_id, const e1ap_bearer_setup_resp_t *resp)
{
// Encode
E1AP_E1AP_PDU_t *pdu = encode_E1_bearer_context_setup_response(resp);
e1ap_encode_send(UPtype, assoc_id, pdu, 0, __func__);
}
static void e1apCUUP_send_BEARER_CONTEXT_SETUP_FAILURE(sctp_assoc_t assoc_id, const e1ap_bearer_context_setup_failure_t *msg)
{
E1AP_E1AP_PDU_t *pdu = encode_E1_bearer_context_setup_failure(msg);
e1ap_encode_send(UPtype, assoc_id, pdu, 0, __func__);
}
int e1apCUUP_handle_BEARER_CONTEXT_SETUP_REQUEST(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *e1_inst, const E1AP_E1AP_PDU_t *pdu)
{
// Decode E1AP message
e1ap_bearer_setup_req_t bearerCxt = {0};
if (!decode_E1_bearer_context_setup_request(pdu, &bearerCxt)) {
LOG_E(E1AP, "Failed to decode E1 Bearer Context Setup Request\n");
return -1;
}
e1_bearer_context_setup(&bearerCxt);
return 0;
}
int e1apCUCP_handle_BEARER_CONTEXT_SETUP_RESPONSE(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *inst, const E1AP_E1AP_PDU_t *pdu)
{
MessageDef *msg = itti_alloc_new_message(TASK_CUCP_E1, 0, E1AP_BEARER_CONTEXT_SETUP_RESP);
// Decode
e1ap_bearer_setup_resp_t *bearerCxt = &E1AP_BEARER_CONTEXT_SETUP_RESP(msg);
if (!decode_E1_bearer_context_setup_response(pdu, bearerCxt)) {
LOG_E(E1AP, "Failed to decode Bearer Context Setup Response\n");
return -1;
}
msg->ittiMsgHeader.originInstance = assoc_id;
// Fixme: instance is the NGAP instance, no good way to set it here
instance_t instance = 0;
itti_send_msg_to_task(TASK_RRC_GNB, instance, msg);
return 0;
}
int e1apCUCP_handle_BEARER_CONTEXT_SETUP_FAILURE(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *inst, const E1AP_E1AP_PDU_t *pdu)
{
e1ap_bearer_context_setup_failure_t fail = {0};
if (!decode_E1_bearer_context_setup_failure(&fail, pdu)) {
LOG_E(E1AP, "Failed to decode Bearer Context Setup Failure\n");
free_e1_bearer_context_setup_failure(&fail);
return -1;
}
LOG_E(E1AP, "Received Bearer Context Setup Failure with cause value%d \n", fail.cause.value);
MessageDef *msg = itti_alloc_new_message(TASK_CUCP_E1, 0, E1AP_BEARER_CONTEXT_SETUP_FAILURE);
E1AP_BEARER_CONTEXT_SETUP_FAILURE(msg) = fail;
msg->ittiMsgHeader.originInstance = assoc_id;
instance_t instance = 0;
itti_send_msg_to_task(TASK_RRC_GNB, instance, msg);
return 0;
}
static void e1apCUCP_send_BEARER_CONTEXT_MODIFICATION_REQUEST(sctp_assoc_t assoc_id, e1ap_bearer_mod_req_t *const bearerCxt)
{
E1AP_E1AP_PDU_t *pdu = encode_E1_bearer_context_mod_request(bearerCxt);
e1ap_encode_send(CPtype, assoc_id, pdu, 0, __func__);
}
static int e1apCUUP_send_BEARER_CONTEXT_MODIFICATION_RESPONSE(sctp_assoc_t assoc_id, const e1ap_bearer_modif_resp_t *resp)
{
E1AP_E1AP_PDU_t *pdu = encode_E1_bearer_context_mod_response(resp);
return e1ap_encode_send(UPtype, assoc_id, pdu, 0, __func__);
}
int e1apCUUP_send_BEARER_CONTEXT_MODIFICATION_FAILURE(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
/**
* @brief Extract Bearer Context Modification Request from E1AP PDU
* and prepare Bearer Context Modification Response
*/
int e1apCUUP_handle_BEARER_CONTEXT_MODIFICATION_REQUEST(sctp_assoc_t assoc_id,
e1ap_upcp_inst_t *e1_inst,
const E1AP_E1AP_PDU_t *pdu)
{
e1ap_bearer_mod_req_t bearerCxt = {0};
if (!decode_E1_bearer_context_mod_request(pdu, &bearerCxt)) {
LOG_E(E1AP, "Failed to handle Bearer Context Modification Request\n");
free_e1ap_context_mod_request(&bearerCxt);
return -1;
}
e1_bearer_context_modif(&bearerCxt);
free_e1ap_context_mod_request(&bearerCxt);
return 0;
}
int e1apCUCP_handle_BEARER_CONTEXT_MODIFICATION_RESPONSE(sctp_assoc_t assoc_id,
e1ap_upcp_inst_t *e1_inst,
const E1AP_E1AP_PDU_t *pdu)
{
MessageDef *msg = itti_alloc_new_message(TASK_CUUP_E1, 0, E1AP_BEARER_CONTEXT_MODIFICATION_RESP);
e1ap_bearer_modif_resp_t *modif = &E1AP_BEARER_CONTEXT_MODIFICATION_RESP(msg);
if(!decode_E1_bearer_context_mod_response(modif, pdu)) {
free_e1ap_context_mod_response(modif);
return -1;
}
itti_send_msg_to_task(TASK_RRC_GNB, 0, msg);
return 0;
}
int e1apCUCP_handle_BEARER_CONTEXT_MODIFICATION_FAILURE(instance_t instance,
sctp_assoc_t assoc_id,
uint32_t stream,
E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUUP_send_BEARER_CONTEXT_MODIFICATION_REQUIRED(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUCP_send_BEARER_CONTEXT_MODIFICATION_CONFIRM(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUCP_handle_BEARER_CONTEXT_MODIFICATION_REQUIRED(instance_t instance,
sctp_assoc_t assoc_id,
uint32_t stream,
E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUUP_handle_BEARER_CONTEXT_MODIFICATION_CONFIRM(instance_t instance,
sctp_assoc_t assoc_id,
uint32_t stream,
E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
/*
BEARER CONTEXT RELEASE
*/
static int fill_BEARER_CONTEXT_RELEASE_COMMAND(e1ap_bearer_release_cmd_t *const cmd, E1AP_E1AP_PDU_t *pdu)
{
pdu->present = E1AP_E1AP_PDU_PR_initiatingMessage;
asn1cCalloc(pdu->choice.initiatingMessage, msg);
msg->procedureCode = E1AP_ProcedureCode_id_bearerContextRelease;
msg->criticality = E1AP_Criticality_reject;
msg->value.present = E1AP_InitiatingMessage__value_PR_BearerContextReleaseCommand;
E1AP_BearerContextReleaseCommand_t *out = &pdu->choice.initiatingMessage->value.choice.BearerContextReleaseCommand;
/* mandatory */
/* c1. gNB-CU-CP UE E1AP ID */
asn1cSequenceAdd(out->protocolIEs.list, E1AP_BearerContextReleaseCommandIEs_t, ieC1);
ieC1->id = E1AP_ProtocolIE_ID_id_gNB_CU_CP_UE_E1AP_ID;
ieC1->criticality = E1AP_Criticality_reject;
ieC1->value.present = E1AP_BearerContextReleaseCommandIEs__value_PR_GNB_CU_CP_UE_E1AP_ID;
ieC1->value.choice.GNB_CU_CP_UE_E1AP_ID = cmd->gNB_cu_cp_ue_id;
/* mandatory */
/* c2. gNB-CU-UP UE E1AP ID */
asn1cSequenceAdd(out->protocolIEs.list, E1AP_BearerContextReleaseCommandIEs_t, ieC2);
ieC2->id = E1AP_ProtocolIE_ID_id_gNB_CU_UP_UE_E1AP_ID;
ieC2->criticality = E1AP_Criticality_reject;
ieC2->value.present = E1AP_BearerContextReleaseCommandIEs__value_PR_GNB_CU_UP_UE_E1AP_ID;
ieC2->value.choice.GNB_CU_UP_UE_E1AP_ID = cmd->gNB_cu_cp_ue_id;
return 0;
}
int e1apCUCP_send_BEARER_CONTEXT_RELEASE_COMMAND(sctp_assoc_t assoc_id, e1ap_bearer_release_cmd_t *const cmd)
{
E1AP_E1AP_PDU_t pdu = {0};
fill_BEARER_CONTEXT_RELEASE_COMMAND(cmd, &pdu);
return e1ap_encode_send(CPtype, assoc_id, &pdu, 0, __func__);
}
static int fill_BEARER_CONTEXT_RELEASE_COMPLETE(const e1ap_bearer_release_cplt_t *cplt, E1AP_E1AP_PDU_t *pdu)
{
pdu->present = E1AP_E1AP_PDU_PR_successfulOutcome;
asn1cCalloc(pdu->choice.successfulOutcome, msg);
msg->procedureCode = E1AP_ProcedureCode_id_bearerContextRelease;
msg->criticality = E1AP_Criticality_reject;
msg->value.present = E1AP_SuccessfulOutcome__value_PR_BearerContextReleaseComplete;
E1AP_BearerContextReleaseComplete_t *out = &pdu->choice.successfulOutcome->value.choice.BearerContextReleaseComplete;
/* mandatory */
/* c1. gNB-CU-CP UE E1AP ID */
asn1cSequenceAdd(out->protocolIEs.list, E1AP_BearerContextReleaseCompleteIEs_t, ieC1);
ieC1->id = E1AP_ProtocolIE_ID_id_gNB_CU_CP_UE_E1AP_ID;
ieC1->criticality = E1AP_Criticality_reject;
ieC1->value.present = E1AP_BearerContextReleaseCompleteIEs__value_PR_GNB_CU_CP_UE_E1AP_ID;
ieC1->value.choice.GNB_CU_CP_UE_E1AP_ID = cplt->gNB_cu_cp_ue_id;
/* mandatory */
/* c2. gNB-CU-UP UE E1AP ID */
asn1cSequenceAdd(out->protocolIEs.list, E1AP_BearerContextReleaseCompleteIEs_t, ieC2);
ieC2->id = E1AP_ProtocolIE_ID_id_gNB_CU_UP_UE_E1AP_ID;
ieC2->criticality = E1AP_Criticality_reject;
ieC2->value.present = E1AP_BearerContextReleaseCompleteIEs__value_PR_GNB_CU_UP_UE_E1AP_ID;
ieC2->value.choice.GNB_CU_UP_UE_E1AP_ID = cplt->gNB_cu_cp_ue_id;
return 0;
}
int e1apCUUP_send_BEARER_CONTEXT_RELEASE_COMPLETE(sctp_assoc_t assoc_id, const e1ap_bearer_release_cplt_t *cplt)
{
E1AP_E1AP_PDU_t pdu = {0};
fill_BEARER_CONTEXT_RELEASE_COMPLETE(cplt, &pdu);
return e1ap_encode_send(CPtype, assoc_id, &pdu, 0, __func__);
}
int e1apCUUP_send_BEARER_CONTEXT_RELEASE_REQUEST(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
void extract_BEARER_CONTEXT_RELEASE_COMMAND(const E1AP_E1AP_PDU_t *pdu, e1ap_bearer_release_cmd_t *bearerCxt)
{
const E1AP_BearerContextReleaseCommand_t *in = &pdu->choice.initiatingMessage->value.choice.BearerContextReleaseCommand;
E1AP_BearerContextReleaseCommandIEs_t *ie;
LOG_D(E1AP, "Bearer context setup number of IEs %d\n", in->protocolIEs.list.count);
for (int i = 0; i < in->protocolIEs.list.count; i++) {
ie = in->protocolIEs.list.array[i];
switch(ie->id) {
case E1AP_ProtocolIE_ID_id_gNB_CU_CP_UE_E1AP_ID:
DevAssert(ie->criticality == E1AP_Criticality_reject);
DevAssert(ie->value.present == E1AP_BearerContextReleaseCommandIEs__value_PR_GNB_CU_CP_UE_E1AP_ID);
bearerCxt->gNB_cu_cp_ue_id = ie->value.choice.GNB_CU_CP_UE_E1AP_ID;
break;
case E1AP_ProtocolIE_ID_id_gNB_CU_UP_UE_E1AP_ID:
DevAssert(ie->criticality == E1AP_Criticality_reject);
DevAssert(ie->value.present == E1AP_BearerContextReleaseCommandIEs__value_PR_GNB_CU_UP_UE_E1AP_ID);
bearerCxt->gNB_cu_up_ue_id = ie->value.choice.GNB_CU_UP_UE_E1AP_ID;
break;
case E1AP_ProtocolIE_ID_id_Cause:
DevAssert(ie->criticality == E1AP_Criticality_ignore);
DevAssert(ie->value.present == E1AP_BearerContextReleaseCommandIEs__value_PR_Cause);
bearerCxt->cause_type = ie->value.choice.Cause.present;
if ((ie->value.choice.Cause.present != E1AP_Cause_PR_NOTHING) &&
(ie->value.choice.Cause.present != E1AP_Cause_PR_choice_extension))
bearerCxt->cause = ie->value.choice.Cause.choice.radioNetwork;
break;
default:
LOG_E(E1AP, "Handle for this IE is not implemented (or) invalid IE detected\n");
break;
}
}
}
int e1apCUUP_handle_BEARER_CONTEXT_RELEASE_COMMAND(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *e1_inst, const E1AP_E1AP_PDU_t *pdu)
{
DevAssert(pdu != NULL);
DevAssert(pdu->present == E1AP_E1AP_PDU_PR_initiatingMessage);
DevAssert(pdu->choice.initiatingMessage->procedureCode == E1AP_ProcedureCode_id_bearerContextRelease);
DevAssert(pdu->choice.initiatingMessage->criticality == E1AP_Criticality_reject);
DevAssert(pdu->choice.initiatingMessage->value.present == E1AP_InitiatingMessage__value_PR_BearerContextReleaseCommand);
e1ap_bearer_release_cmd_t bearerCxt = {0};
extract_BEARER_CONTEXT_RELEASE_COMMAND(pdu, &bearerCxt);
e1_bearer_release_cmd(&bearerCxt);
return 0;
}
void extract_BEARER_CONTEXT_RELEASE_COMPLETE(const E1AP_E1AP_PDU_t *pdu, e1ap_bearer_release_cplt_t *bearerCxt)
{
const E1AP_BearerContextReleaseComplete_t *in = &pdu->choice.successfulOutcome->value.choice.BearerContextReleaseComplete;
E1AP_BearerContextReleaseCompleteIEs_t *ie;
LOG_D(E1AP, "Bearer context setup number of IEs %d\n", in->protocolIEs.list.count);
for (int i = 0; i < in->protocolIEs.list.count; i++) {
ie = in->protocolIEs.list.array[i];
switch(ie->id) {
case E1AP_ProtocolIE_ID_id_gNB_CU_CP_UE_E1AP_ID:
DevAssert(ie->criticality == E1AP_Criticality_reject);
DevAssert(ie->value.present == E1AP_BearerContextReleaseCompleteIEs__value_PR_GNB_CU_CP_UE_E1AP_ID);
bearerCxt->gNB_cu_cp_ue_id = ie->value.choice.GNB_CU_CP_UE_E1AP_ID;
break;
case E1AP_ProtocolIE_ID_id_gNB_CU_UP_UE_E1AP_ID:
DevAssert(ie->criticality == E1AP_Criticality_reject);
DevAssert(ie->value.present == E1AP_BearerContextReleaseCompleteIEs__value_PR_GNB_CU_UP_UE_E1AP_ID);
bearerCxt->gNB_cu_up_ue_id = ie->value.choice.GNB_CU_UP_UE_E1AP_ID;
break;
default:
LOG_E(E1AP, "Handle for this IE is not implemented (or) invalid IE detected\n");
break;
}
}
}
int e1apCUCP_handle_BEARER_CONTEXT_RELEASE_COMPLETE(sctp_assoc_t assoc_id, e1ap_upcp_inst_t *e1_inst, const E1AP_E1AP_PDU_t *pdu)
{
DevAssert(pdu != NULL);
DevAssert(pdu->present == E1AP_E1AP_PDU_PR_successfulOutcome);
DevAssert(pdu->choice.successfulOutcome->procedureCode == E1AP_ProcedureCode_id_bearerContextRelease);
DevAssert(pdu->choice.successfulOutcome->criticality == E1AP_Criticality_reject);
DevAssert(pdu->choice.successfulOutcome->value.present == E1AP_SuccessfulOutcome__value_PR_BearerContextReleaseComplete);
e1ap_bearer_release_cplt_t bearerCxt = {0};
extract_BEARER_CONTEXT_RELEASE_COMPLETE(pdu, &bearerCxt);
MessageDef *msg = itti_alloc_new_message(TASK_CUUP_E1, 0, E1AP_BEARER_CONTEXT_RELEASE_CPLT);
e1ap_bearer_release_cplt_t *cplt = &E1AP_BEARER_CONTEXT_RELEASE_CPLT(msg);
*cplt = bearerCxt;
itti_send_msg_to_task(TASK_RRC_GNB, 0, msg);
return 0;
}
int e1apCUCP_handle_BEARER_CONTEXT_RELEASE_REQUEST(instance_t instance,
sctp_assoc_t assoc_id,
uint32_t stream,
E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
/*
BEARER CONTEXT INACTIVITY NOTIFICATION
*/
int e1apCUUP_send_BEARER_CONTEXT_INACTIVITY_NOTIFICATION(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUCP_handle_BEARER_CONTEXT_INACTIVITY_NOTIFICATION(instance_t instance,
sctp_assoc_t assoc_id,
uint32_t stream,
E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
/*
DL DATA
*/
int e1apCUUP_send_DL_DATA_NOTIFICATION(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUUP_send_DATA_USAGE_REPORT(instance_t instance)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUCP_handle_DL_DATA_NOTIFICATION(instance_t instance, sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
int e1apCUCP_handle_send_DATA_USAGE_REPORT(instance_t instance, sctp_assoc_t assoc_id, uint32_t stream, E1AP_E1AP_PDU_t *pdu)
{
AssertFatal(false, "Not implemented yet\n");
return -1;
}
static instance_t cuup_task_create_gtpu_instance_to_du(eth_params_t *IPaddrs)
{
openAddr_t tmp = {0};
strncpy(tmp.originHost, IPaddrs->my_addr, sizeof(tmp.originHost) - 1);
sprintf(tmp.originService, "%d", IPaddrs->my_portd);
sprintf(tmp.destinationService, "%d", IPaddrs->remote_portd);
return gtpv1Init(tmp);
}
static void e1_task_send_sctp_association_req(long task_id, instance_t instance, e1ap_net_config_t *e1ap_nc)
{
DevAssert(e1ap_nc != NULL);
getCxtE1(instance)->sockState = SCTP_STATE_CLOSED;
MessageDef *message_p = itti_alloc_new_message(task_id, 0, SCTP_NEW_ASSOCIATION_REQ);
sctp_new_association_req_t *sctp_new_req = &message_p->ittiMsg.sctp_new_association_req;
sctp_new_req->ulp_cnx_id = instance;
sctp_new_req->port = E1AP_PORT_NUMBER;
sctp_new_req->ppid = E1AP_SCTP_PPID;
// remote
sctp_new_req->remote_address = e1ap_nc->CUCP_e1_ip_address;
// local
sctp_new_req->local_address = e1ap_nc->CUUP_e1_ip_address;
itti_send_msg_to_task(TASK_SCTP, instance, message_p);
}
static void e1apCUUP_send_SETUP_REQUEST(sctp_assoc_t assoc_id, e1ap_setup_req_t *setup)
{
setup->transac_id = E1AP_get_next_transaction_identifier();
LOG_D(E1AP, "Transaction ID of setup request %ld\n", setup->transac_id);
E1AP_E1AP_PDU_t *pdu = encode_e1ap_cuup_setup_request(setup);
e1ap_encode_send(UPtype, assoc_id, pdu, 0, __func__);
}
/**
* @brief SCTP association response handler (CU-CP to/from CU-UP)
* it behaves differently depending on the type of E1 instance,
* CUCP: informs RRC of E1 connection loss with CU-UP
* CUUP: triggers a new SCTP association request by sending an ITTI to the CU-UP task
* @param type indicates whether the handler is for the CU-CP or CU-UP
*/
static void e1_task_handle_sctp_association_resp(E1_t type,
instance_t instance,
sctp_new_association_resp_t *sctp_new_association_resp)
{
DevAssert(sctp_new_association_resp != NULL);
getCxtE1(instance)->sockState = sctp_new_association_resp->sctp_state;
// Handle SCTP establishment failure
if (sctp_new_association_resp->sctp_state != SCTP_STATE_ESTABLISHED) {
if (type == CPtype) {
// Inform RRC that the CU-UP is gone
LOG_W(E1AP,
"Lost connection (%s) with CU-UP (assoc_id %d)\n",
sctp_state_s[sctp_new_association_resp->sctp_state],
sctp_new_association_resp->assoc_id);
MessageDef *message_p = itti_alloc_new_message(TASK_CUCP_E1, 0, E1AP_LOST_CONNECTION);
message_p->ittiMsgHeader.originInstance = sctp_new_association_resp->assoc_id;
itti_send_msg_to_task(TASK_RRC_GNB, instance, message_p);
} else if (type == UPtype) {
// Trigger new E1 association when no CU-CP is connected
LOG_W(E1AP,
"Lost connection (%s) with CU-CP (assoc_id %d): trigger new E1 association\n",
sctp_state_s[sctp_new_association_resp->sctp_state],
sctp_new_association_resp->assoc_id);
long timer_id;
timer_setup(1, 0, TASK_CUUP_E1, 0, TIMER_ONE_SHOT, NULL, &timer_id);
}
return;
}
if (type == UPtype) {
e1ap_upcp_inst_t *inst = getCxtE1(instance);
inst->cuup.assoc_id = sctp_new_association_resp->assoc_id;
e1ap_net_config_t *nc = &inst->net_config;
eth_params_t IPaddr = {0};
IPaddr.my_addr = nc->localAddressF1U;
IPaddr.my_portd = nc->localPortF1U;
IPaddr.remote_portd = nc->remotePortF1U;
if (getCxtE1(instance)->gtpInstF1U < 0)
getCxtE1(instance)->gtpInstF1U = cuup_task_create_gtpu_instance_to_du(&IPaddr);
if (getCxtE1(instance)->gtpInstF1U < 0)
LOG_E(E1AP, "Failed to create CUUP F1-U UDP listener\n");
extern instance_t CUuniqInstance;
CUuniqInstance = getCxtE1(instance)->gtpInstF1U;
cuup_init_n3(instance);
e1apCUUP_send_SETUP_REQUEST(inst->cuup.assoc_id, &inst->cuup.setupReq);
}
}
void cuup_init_n3(instance_t instance)
{
if (getCxtE1(instance)->gtpInstN3 < 0) {
e1ap_net_config_t *nc = &getCxtE1(instance)->net_config;
openAddr_t tmp = {0};
strcpy(tmp.originHost, nc->localAddressN3);
sprintf(tmp.originService, "%d", nc->localPortN3);
sprintf(tmp.destinationService, "%d", nc->remotePortN3);
LOG_I(GTPU, "Configuring GTPu address : %s, port : %s\n", tmp.originHost, tmp.originService);
// Fixme: fully inconsistent instances management
// dirty global var is a bad fix
extern instance_t legacyInstanceMapping;
legacyInstanceMapping = getCxtE1(instance)->gtpInstN3 = gtpv1Init(tmp);
}
if (getCxtE1(instance)->gtpInstN3 < 0)
LOG_E(E1AP, "Failed to create CUUP N3 UDP listener\n");
extern instance_t *N3GTPUInst;
N3GTPUInst = &getCxtE1(instance)->gtpInstN3;
}
void cucp_task_send_sctp_init_req(instance_t instance, char *my_addr)
{
size_t addr_len = strlen(my_addr) + 1;
LOG_I(E1AP, "E1AP_CUCP_SCTP_REQ(create socket) for %s len %ld\n", my_addr, addr_len);
MessageDef *message_p = itti_alloc_new_message_sized(TASK_CUCP_E1, 0, SCTP_INIT_MSG, sizeof(sctp_init_t) + addr_len);
sctp_init_t *init = &SCTP_INIT_MSG(message_p);
init->port = E1AP_PORT_NUMBER;
init->ppid = E1AP_SCTP_PPID;
char *addr_buf = (char *) (init + 1); // address after sctp_init ITTI message end, allocated above
init->bind_address = addr_buf;
memcpy(addr_buf, my_addr, addr_len);
itti_send_msg_to_task(TASK_SCTP, instance, message_p);
}
void e1_task_handle_sctp_association_ind(E1_t type, instance_t instance, sctp_new_association_ind_t *sctp_new_ind)
{
if (!getCxtE1(instance))
createE1inst(type, instance, 0, NULL, NULL);
e1ap_upcp_inst_t *inst = getCxtE1(instance);
inst->sockState = SCTP_STATE_ESTABLISHED;
if (type == UPtype)
inst->cuup.assoc_id = sctp_new_ind->assoc_id;
}
/**
* @brief Handle the timer triggered by a connection loss with CU-CP
* it uses a stored network configuration and send a new SCTP association request
*/
static void e1apHandleTimer(instance_t myInstance)
{
LOG_W(E1AP, "Try to reconnect to CP\n");
if (getCxtE1(myInstance)->sockState != SCTP_STATE_ESTABLISHED)
e1_task_send_sctp_association_req(TASK_CUUP_E1, myInstance, &getCxtE1(myInstance)->net_config);
}
/**
* @brief E1AP Centralized Unit Control Plane (CU-CP) task function.
*
* This is the main task loop for the E1AP CUCP module:
* it listens for incoming messages from the Inter-Task Interface (ITTI)
* and calls the relevant handlers for each message type.
*
*/
void *E1AP_CUCP_task(void *arg)
{
LOG_I(E1AP, "Starting E1AP at CU CP\n");
MessageDef *msg = NULL;
e1ap_common_init();
int result;
while (1) {
itti_receive_msg(TASK_CUCP_E1, &msg);
instance_t myInstance = ITTI_MSG_DESTINATION_INSTANCE(msg);
const int msgType = ITTI_MSG_ID(msg);
LOG_D(E1AP, "CUCP received %s for instance %ld\n", messages_info[msgType].name, myInstance);
sctp_assoc_t assoc_id = msg->ittiMsgHeader.originInstance;
switch (ITTI_MSG_ID(msg)) {
case SCTP_NEW_ASSOCIATION_IND:
e1_task_handle_sctp_association_ind(CPtype, ITTI_MSG_ORIGIN_INSTANCE(msg), &msg->ittiMsg.sctp_new_association_ind);
break;
case SCTP_NEW_ASSOCIATION_RESP:
e1_task_handle_sctp_association_resp(CPtype, ITTI_MSG_ORIGIN_INSTANCE(msg), &msg->ittiMsg.sctp_new_association_resp);
break;
case E1AP_REGISTER_REQ: {
// note: we use E1AP_REGISTER_REQ only to set up sockets, the
// E1AP_SETUP_REQ is not used and comes through the socket from the
// CU-UP later!
e1ap_net_config_t *nc = &E1AP_REGISTER_REQ(msg).net_config;
AssertFatal(nc->CUCP_e1_ip_address.ipv4 != 0, "No IPv4 address configured\n");
cucp_task_send_sctp_init_req(0, nc->CUCP_e1_ip_address.ipv4_address);
} break;
case E1AP_SETUP_REQ:
AssertFatal(false, "should not receive E1AP_SETUP_REQ in CU-CP!\n");
break;
case SCTP_DATA_IND:
e1_task_handle_sctp_data_ind(myInstance, &msg->ittiMsg.sctp_data_ind);
break;
case E1AP_SETUP_RESP:
e1ap_send_SETUP_RESPONSE(assoc_id, &E1AP_SETUP_RESP(msg));
free_e1ap_cuup_setup_response(&E1AP_SETUP_RESP(msg));
break;
case E1AP_SETUP_FAIL:
e1apCUCP_send_SETUP_FAILURE(assoc_id, &E1AP_SETUP_FAIL(msg));
free_e1ap_cuup_setup_failure(&E1AP_SETUP_FAIL(msg));
break;
case E1AP_BEARER_CONTEXT_SETUP_REQ:
e1apCUCP_send_BEARER_CONTEXT_SETUP_REQUEST(assoc_id, &E1AP_BEARER_CONTEXT_SETUP_REQ(msg));
free_e1ap_context_setup_request(&E1AP_BEARER_CONTEXT_SETUP_REQ(msg));
break;
case E1AP_BEARER_CONTEXT_MODIFICATION_REQ:
e1apCUCP_send_BEARER_CONTEXT_MODIFICATION_REQUEST(assoc_id, &E1AP_BEARER_CONTEXT_MODIFICATION_REQ(msg));
free_e1ap_context_mod_request(&E1AP_BEARER_CONTEXT_MODIFICATION_REQ(msg));
break;
case E1AP_BEARER_CONTEXT_RELEASE_CMD:
e1apCUCP_send_BEARER_CONTEXT_RELEASE_COMMAND(assoc_id, &E1AP_BEARER_CONTEXT_RELEASE_CMD(msg));
break;
default:
LOG_E(E1AP, "Unknown message received in TASK_CUCP_E1\n");
break;
}
result = itti_free(ITTI_MSG_ORIGIN_ID(msg), msg);
AssertFatal(result == EXIT_SUCCESS, "Failed to free memory (%d) in E1AP_CUCP_task!\n", result);
msg = NULL;
}
}
/**
* @brief E1AP Centralized Unit User Plane (CU-UP) task function.
*
* This is the main task loop for the E1AP CUUP module:
* it listens for incoming messages from the Inter-Task Interface (ITTI)
* and calls the relevant handlers for each message type.
*
*/
void *E1AP_CUUP_task(void *arg)
{
LOG_I(E1AP, "Starting E1AP at CU UP\n");
e1ap_common_init();
int result;
// SCTP
while (1) {
MessageDef *msg = NULL;
itti_receive_msg(TASK_CUUP_E1, &msg);
const instance_t myInstance = ITTI_MSG_DESTINATION_INSTANCE(msg);
const int msgType = ITTI_MSG_ID(msg);
LOG_D(E1AP, "CUUP received %s for instance %ld\n", messages_info[msgType].name, myInstance);
switch (msgType) {
case E1AP_REGISTER_REQ: {
/* E1AP Register Request triggered at startup
create a new E1 instance and send the first association request */
e1ap_register_req_t *reg_req = &E1AP_REGISTER_REQ(msg);
createE1inst(UPtype, myInstance, reg_req->gnb_id, &reg_req->net_config, &reg_req->setup_req);
e1_task_send_sctp_association_req(TASK_CUUP_E1, myInstance, &reg_req->net_config);
} break;
case SCTP_NEW_ASSOCIATION_RESP:
e1_task_handle_sctp_association_resp(UPtype, myInstance, &msg->ittiMsg.sctp_new_association_resp);
if (getCxtE1(myInstance)->sockState == SCTP_STATE_ESTABLISHED)
LOG_A(E1AP, "E1 connection established (%s)\n", sctp_state_s[getCxtE1(myInstance)->sockState]);
break;
case SCTP_DATA_IND:
e1_task_handle_sctp_data_ind(myInstance, &msg->ittiMsg.sctp_data_ind);
break;
case TIMER_HAS_EXPIRED:
// Timer triggered by a connection loss with CU-CP
e1apHandleTimer(myInstance);
break;
case E1AP_BEARER_CONTEXT_SETUP_RESP: {
const e1ap_bearer_setup_resp_t *resp = &E1AP_BEARER_CONTEXT_SETUP_RESP(msg);
const e1ap_upcp_inst_t *inst = getCxtE1(myInstance);
AssertFatal(inst, "no E1 instance found for instance %ld\n", myInstance);
e1apCUUP_send_BEARER_CONTEXT_SETUP_RESPONSE(inst->cuup.assoc_id, resp);
free_e1ap_context_setup_response(resp);
} break;
case E1AP_BEARER_CONTEXT_SETUP_FAILURE: {
const e1ap_bearer_context_setup_failure_t *fail = &E1AP_BEARER_CONTEXT_SETUP_FAILURE(msg);
const e1ap_upcp_inst_t *inst = getCxtE1(myInstance);
AssertFatal(inst, "no E1 instance found for instance %ld\n", myInstance);
e1apCUUP_send_BEARER_CONTEXT_SETUP_FAILURE(inst->cuup.assoc_id, fail);
free_e1_bearer_context_setup_failure(fail);
} break;
case E1AP_BEARER_CONTEXT_MODIFICATION_RESP: {
const e1ap_bearer_modif_resp_t *resp = &E1AP_BEARER_CONTEXT_MODIFICATION_RESP(msg);
const e1ap_upcp_inst_t *inst = getCxtE1(myInstance);
AssertFatal(inst, "no E1 instance found for instance %ld\n", myInstance);
e1apCUUP_send_BEARER_CONTEXT_MODIFICATION_RESPONSE(inst->cuup.assoc_id, resp);
free_e1ap_context_mod_response(resp);
} break;
case E1AP_BEARER_CONTEXT_RELEASE_CPLT: {
const e1ap_bearer_release_cplt_t *cplt = &E1AP_BEARER_CONTEXT_RELEASE_CPLT(msg);
const e1ap_upcp_inst_t *inst = getCxtE1(myInstance);
AssertFatal(inst, "no E1 instance found for instance %ld\n", myInstance);
e1apCUUP_send_BEARER_CONTEXT_RELEASE_COMPLETE(inst->cuup.assoc_id, cplt);
} break;
default:
LOG_E(E1AP, "Unknown message received in TASK_CUUP_E1\n");
break;
}
result = itti_free(ITTI_MSG_ORIGIN_ID(msg), msg);
AssertFatal(result == EXIT_SUCCESS, "Failed to free memory (%d) in E1AP_CUUP_task!\n", result);
msg = NULL;
}
}
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