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openairinterface5g/openair2/X2AP/x2ap_eNB.c
T
Robert Schmidt dfa012162b Rewrite sctp_create_new_listener() to handle DNS, IPv6 
Rewrite sctp_create_new_listener() to use getaddrinfo() to look up
IPv4/IPv6 addresses via a common interface. This allows to use e.g. DNS,
and enables the SCTP library to listen on IPv6 ports.

To support the above, the corresponding message is changed to not take
an IPv4 address on 4 bytes (and separate IPv6), but a single name that
will be resolved via getaddrinfo()

The previous init message used to allow multiple IPv4/IPv6 addresses;
since this is not used anywhere, remove the corresponding functionality.

Modify all uses of this ITTI message to copy te SCTP init bind addr into
ITTI message.
2024-04-13 05:15:11 +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
*
* 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.c
* \brief x2ap tasks 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 <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <arpa/inet.h>
#include "intertask_interface.h"
#include "x2ap_eNB.h"
#include "x2ap_eNB_defs.h"
#include "x2ap_eNB_management_procedures.h"
#include "x2ap_eNB_handler.h"
#include "x2ap_eNB_generate_messages.h"
#include "x2ap_common.h"
#include "x2ap_ids.h"
#include "x2ap_timers.h"
#include "queue.h"
#include "assertions.h"
#include "conversions.h"
struct x2ap_enb_map;
struct x2ap_eNB_data_s;
RB_PROTOTYPE(x2ap_enb_map, x2ap_eNB_data_s, entry, x2ap_eNB_compare_assoc_id);
static
void x2ap_eNB_handle_sctp_data_ind(instance_t instance, sctp_data_ind_t *sctp_data_ind);
static
void x2ap_eNB_handle_sctp_association_resp(instance_t instance, sctp_new_association_resp_t *sctp_new_association_resp);
static
void x2ap_eNB_handle_sctp_association_ind(instance_t instance, sctp_new_association_ind_t *sctp_new_association_ind);
static
void x2ap_eNB_handle_register_eNB(instance_t instance,
x2ap_register_enb_req_t *x2ap_register_eNB);
static
void x2ap_eNB_register_eNB(x2ap_eNB_instance_t *instance_p,
net_ip_address_t *target_eNB_ip_addr,
net_ip_address_t *local_ip_addr,
uint16_t in_streams,
uint16_t out_streams,
uint32_t enb_port_for_X2C);
static
void x2ap_eNB_handle_handover_req(instance_t instance,
x2ap_handover_req_t *x2ap_handover_req);
static
void x2ap_eNB_handle_handover_req_ack(instance_t instance,
x2ap_handover_req_ack_t *x2ap_handover_req_ack);
static
void x2ap_eNB_ue_context_release(instance_t instance,
x2ap_ue_context_release_t *x2ap_ue_context_release);
static
void x2ap_eNB_handle_sctp_data_ind(instance_t instance, sctp_data_ind_t *sctp_data_ind) {
int result;
DevAssert(sctp_data_ind != NULL);
x2ap_eNB_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 x2ap_eNB_handle_sctp_association_resp(instance_t instance, sctp_new_association_resp_t *sctp_new_association_resp) {
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *x2ap_enb_data_p;
DevAssert(sctp_new_association_resp != NULL);
dump_trees();
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
/* if the assoc_id is already known, it is certainly because an IND was received
* before. In this case, just update streams and return
*/
if (sctp_new_association_resp->assoc_id != -1) {
x2ap_enb_data_p = x2ap_get_eNB(instance_p, sctp_new_association_resp->assoc_id,
sctp_new_association_resp->ulp_cnx_id);
if (x2ap_enb_data_p != NULL) {
/* some sanity check - to be refined at some point */
if (sctp_new_association_resp->sctp_state != SCTP_STATE_ESTABLISHED) {
X2AP_ERROR("x2ap_enb_data_p not NULL and sctp state not SCTP_STATE_ESTABLISHED?\n");
if (sctp_new_association_resp->sctp_state == SCTP_STATE_SHUTDOWN){
RB_REMOVE(x2ap_enb_map, &instance_p->x2ap_enb_head, x2ap_enb_data_p);
return;
}
exit(1);
}
x2ap_enb_data_p->in_streams = sctp_new_association_resp->in_streams;
x2ap_enb_data_p->out_streams = sctp_new_association_resp->out_streams;
return;
}
}
x2ap_enb_data_p = x2ap_get_eNB(instance_p, -1,
sctp_new_association_resp->ulp_cnx_id);
DevAssert(x2ap_enb_data_p != NULL);
dump_trees();
/* gNB: exit if connection to eNB failed - to be modified if needed.
* We may want to try to connect over and over again until we succeed
* but the modifications to the code to get this behavior are complex.
* Exit on error is a simple solution that can be caught by a script
* for example.
*/
if (instance_p->cell_type == CELL_MACRO_GNB
&& sctp_new_association_resp->sctp_state == SCTP_STATE_UNREACHABLE) {
X2AP_ERROR("association with eNB failed, is it running? If no, run it first. If yes, check IP addresses in your configuration file.\n");
exit(1);
}
if (sctp_new_association_resp->sctp_state != SCTP_STATE_ESTABLISHED) {
X2AP_WARN("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);
x2ap_handle_x2_setup_message(instance_p, x2ap_enb_data_p,
sctp_new_association_resp->sctp_state == SCTP_STATE_SHUTDOWN);
return;
}
dump_trees();
/* Update parameters */
x2ap_enb_data_p->assoc_id = sctp_new_association_resp->assoc_id;
x2ap_enb_data_p->in_streams = sctp_new_association_resp->in_streams;
x2ap_enb_data_p->out_streams = sctp_new_association_resp->out_streams;
dump_trees();
/* Prepare new x2 Setup Request */
if(instance_p->cell_type == CELL_MACRO_GNB)
x2ap_gNB_generate_ENDC_x2_setup_request(instance_p, x2ap_enb_data_p);
else
x2ap_eNB_generate_x2_setup_request(instance_p, x2ap_enb_data_p);
}
static
void x2ap_eNB_handle_sctp_association_ind(instance_t instance, sctp_new_association_ind_t *sctp_new_association_ind) {
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *x2ap_enb_data_p;
printf("x2ap_eNB_handle_sctp_association_ind at 1 (called for instance %ld)\n", instance);
dump_trees();
DevAssert(sctp_new_association_ind != NULL);
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
x2ap_enb_data_p = x2ap_get_eNB(instance_p, sctp_new_association_ind->assoc_id, -1);
if (x2ap_enb_data_p != NULL) abort();
// DevAssert(x2ap_enb_data_p != NULL);
if (x2ap_enb_data_p == NULL) {
/* Create new eNB descriptor */
x2ap_enb_data_p = calloc(1, sizeof(*x2ap_enb_data_p));
DevAssert(x2ap_enb_data_p != NULL);
x2ap_enb_data_p->cnx_id = x2ap_eNB_fetch_add_global_cnx_id();
x2ap_enb_data_p->x2ap_eNB_instance = instance_p;
/* Insert the new descriptor in list of known eNB
* but not yet associated.
*/
RB_INSERT(x2ap_enb_map, &instance_p->x2ap_enb_head, x2ap_enb_data_p);
x2ap_enb_data_p->state = X2AP_ENB_STATE_CONNECTED;
instance_p->x2_target_enb_nb++;
if (instance_p->x2_target_enb_pending_nb > 0) {
instance_p->x2_target_enb_pending_nb--;
}
} else {
X2AP_WARN("x2ap_enb_data_p already exists\n");
}
printf("x2ap_eNB_handle_sctp_association_ind at 2\n");
dump_trees();
/* Update parameters */
x2ap_enb_data_p->assoc_id = sctp_new_association_ind->assoc_id;
x2ap_enb_data_p->in_streams = sctp_new_association_ind->in_streams;
x2ap_enb_data_p->out_streams = sctp_new_association_ind->out_streams;
printf("x2ap_eNB_handle_sctp_association_ind at 3\n");
dump_trees();
}
int x2ap_eNB_init_sctp (x2ap_eNB_instance_t *instance_p,
net_ip_address_t *local_ip_addr,
uint32_t enb_port_for_X2C) {
// Create and alloc new message
DevAssert(instance_p != NULL);
DevAssert(local_ip_addr != NULL);
size_t addr_len = strlen(local_ip_addr->ipv4_address) + 1;
MessageDef *message = itti_alloc_new_message_sized(TASK_X2AP, 0, SCTP_INIT_MSG_MULTI_REQ, sizeof(sctp_init_t) + addr_len);
sctp_init_t *sctp_init = &message->ittiMsg.sctp_init_multi;
sctp_init->port = enb_port_for_X2C;
sctp_init->ppid = X2AP_SCTP_PPID;
char *addr_buf = (char *) (sctp_init + 1);
sctp_init->bind_address = addr_buf;
memcpy(addr_buf, local_ip_addr->ipv4_address, addr_len);
return itti_send_msg_to_task (TASK_SCTP, instance_p->instance, message);
}
static void x2ap_eNB_register_eNB(x2ap_eNB_instance_t *instance_p,
net_ip_address_t *target_eNB_ip_address,
net_ip_address_t *local_ip_addr,
uint16_t in_streams,
uint16_t out_streams,
uint32_t enb_port_for_X2C) {
MessageDef *message = NULL;
x2ap_eNB_data_t *x2ap_enb_data = NULL;
DevAssert(instance_p != NULL);
DevAssert(target_eNB_ip_address != NULL);
message = itti_alloc_new_message(TASK_X2AP, 0, SCTP_NEW_ASSOCIATION_REQ);
sctp_new_association_req_t *sctp_new_association_req = &message->ittiMsg.sctp_new_association_req;
sctp_new_association_req->port = enb_port_for_X2C;
sctp_new_association_req->ppid = X2AP_SCTP_PPID;
sctp_new_association_req->in_streams = in_streams;
sctp_new_association_req->out_streams = out_streams;
memcpy(&sctp_new_association_req->remote_address,
target_eNB_ip_address,
sizeof(*target_eNB_ip_address));
memcpy(&sctp_new_association_req->local_address,
local_ip_addr,
sizeof(*local_ip_addr));
/* Create new eNB descriptor */
x2ap_enb_data = calloc(1, sizeof(*x2ap_enb_data));
DevAssert(x2ap_enb_data != NULL);
x2ap_enb_data->cnx_id = x2ap_eNB_fetch_add_global_cnx_id();
sctp_new_association_req->ulp_cnx_id = x2ap_enb_data->cnx_id;
x2ap_enb_data->assoc_id = -1;
x2ap_enb_data->x2ap_eNB_instance = instance_p;
/* Insert the new descriptor in list of known eNB
* but not yet associated.
*/
RB_INSERT(x2ap_enb_map, &instance_p->x2ap_enb_head, x2ap_enb_data);
x2ap_enb_data->state = X2AP_ENB_STATE_WAITING;
instance_p->x2_target_enb_nb ++;
instance_p->x2_target_enb_pending_nb ++;
itti_send_msg_to_task(TASK_SCTP, instance_p->instance, message);
}
static
void x2ap_eNB_handle_register_eNB(instance_t instance,
x2ap_register_enb_req_t *x2ap_register_eNB) {
x2ap_eNB_instance_t *new_instance;
DevAssert(x2ap_register_eNB != NULL);
/* Look if the provided instance already exists */
new_instance = x2ap_eNB_get_instance(instance);
if (new_instance != NULL) {
/* Checks if it is a retry on the same eNB */
DevCheck(new_instance->eNB_id == x2ap_register_eNB->eNB_id, new_instance->eNB_id, x2ap_register_eNB->eNB_id, 0);
DevCheck(new_instance->cell_type == x2ap_register_eNB->cell_type, new_instance->cell_type, x2ap_register_eNB->cell_type, 0);
DevCheck(new_instance->tac == x2ap_register_eNB->tac, new_instance->tac, x2ap_register_eNB->tac, 0);
DevCheck(new_instance->mcc == x2ap_register_eNB->mcc, new_instance->mcc, x2ap_register_eNB->mcc, 0);
DevCheck(new_instance->mnc == x2ap_register_eNB->mnc, new_instance->mnc, x2ap_register_eNB->mnc, 0);
X2AP_WARN("eNB[%ld] already registered\n", instance);
} else {
new_instance = calloc(1, sizeof(x2ap_eNB_instance_t));
DevAssert(new_instance != NULL);
RB_INIT(&new_instance->x2ap_enb_head);
/* Copy usefull parameters */
new_instance->instance = instance;
new_instance->eNB_name = x2ap_register_eNB->eNB_name;
new_instance->eNB_id = x2ap_register_eNB->eNB_id;
new_instance->cell_type = x2ap_register_eNB->cell_type;
new_instance->tac = x2ap_register_eNB->tac;
new_instance->mcc = x2ap_register_eNB->mcc;
new_instance->mnc = x2ap_register_eNB->mnc;
new_instance->mnc_digit_length = x2ap_register_eNB->mnc_digit_length;
new_instance->num_cc = x2ap_register_eNB->num_cc;
x2ap_id_manager_init(&new_instance->id_manager);
x2ap_timers_init(&new_instance->timers,
x2ap_register_eNB->t_reloc_prep,
x2ap_register_eNB->tx2_reloc_overall,
x2ap_register_eNB->t_dc_prep,
x2ap_register_eNB->t_dc_overall);
for (int i = 0; i< x2ap_register_eNB->num_cc; i++) {
if(new_instance->cell_type == CELL_MACRO_GNB){
new_instance->nr_band[i] = x2ap_register_eNB->nr_band[i];
new_instance->tdd_nRARFCN[i] = x2ap_register_eNB->nrARFCN[i];
}
else{
new_instance->eutra_band[i] = x2ap_register_eNB->eutra_band[i];
new_instance->downlink_frequency[i] = x2ap_register_eNB->downlink_frequency[i];
new_instance->fdd_earfcn_DL[i] = x2ap_register_eNB->fdd_earfcn_DL[i];
new_instance->fdd_earfcn_UL[i] = x2ap_register_eNB->fdd_earfcn_UL[i];
}
new_instance->uplink_frequency_offset[i] = x2ap_register_eNB->uplink_frequency_offset[i];
new_instance->Nid_cell[i] = x2ap_register_eNB->Nid_cell[i];
new_instance->N_RB_DL[i] = x2ap_register_eNB->N_RB_DL[i];
new_instance->frame_type[i] = x2ap_register_eNB->frame_type[i];
}
DevCheck(x2ap_register_eNB->nb_x2 <= X2AP_MAX_NB_ENB_IP_ADDRESS,
X2AP_MAX_NB_ENB_IP_ADDRESS, x2ap_register_eNB->nb_x2, 0);
memcpy(new_instance->target_enb_x2_ip_address,
x2ap_register_eNB->target_enb_x2_ip_address,
x2ap_register_eNB->nb_x2 * sizeof(net_ip_address_t));
new_instance->nb_x2 = x2ap_register_eNB->nb_x2;
new_instance->enb_x2_ip_address = x2ap_register_eNB->enb_x2_ip_address;
new_instance->sctp_in_streams = x2ap_register_eNB->sctp_in_streams;
new_instance->sctp_out_streams = x2ap_register_eNB->sctp_out_streams;
new_instance->enb_port_for_X2C = x2ap_register_eNB->enb_port_for_X2C;
/* Add the new instance to the list of eNB (meaningfull in virtual mode) */
x2ap_eNB_insert_new_instance(new_instance);
X2AP_INFO("Registered new eNB[%ld] and %s eNB id %u\n",
instance,
x2ap_register_eNB->cell_type == CELL_MACRO_ENB ? "macro" : "home",
x2ap_register_eNB->eNB_id);
/* initiate the SCTP listener */
if (x2ap_eNB_init_sctp(new_instance,&x2ap_register_eNB->enb_x2_ip_address,x2ap_register_eNB->enb_port_for_X2C) < 0 ) {
X2AP_ERROR ("Error while sending SCTP_INIT_MSG to SCTP \n");
return;
}
X2AP_INFO("eNB[%ld] eNB id %u acting as a listner (server)\n",
instance, x2ap_register_eNB->eNB_id);
}
}
static
void x2ap_eNB_handle_sctp_init_msg_multi_cnf(
instance_t instance_id,
sctp_init_msg_multi_cnf_t *m) {
x2ap_eNB_instance_t *instance;
int index;
DevAssert(m != NULL);
instance = x2ap_eNB_get_instance(instance_id);
DevAssert(instance != NULL);
instance->multi_sd = m->multi_sd;
/* Exit if CNF message reports failure.
* Failure means multi_sd < 0.
*/
if (instance->multi_sd < 0) {
X2AP_ERROR("Error: be sure to properly configure X2 in your configuration file.\n");
DevAssert(instance->multi_sd >= 0);
}
/* Trying to connect to the provided list of eNB ip address */
for (index = 0; index < instance->nb_x2; index++) {
X2AP_INFO("eNB[%ld] eNB id %u acting as an initiator (client)\n",
instance_id, instance->eNB_id);
x2ap_eNB_register_eNB(instance,
&instance->target_enb_x2_ip_address[index],
&instance->enb_x2_ip_address,
instance->sctp_in_streams,
instance->sctp_out_streams,
instance->enb_port_for_X2C);
}
}
static
void x2ap_eNB_handle_handover_req(instance_t instance,
x2ap_handover_req_t *x2ap_handover_req)
{
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *target;
x2ap_id_manager *id_manager;
int ue_id;
int target_pci = x2ap_handover_req->target_physCellId;
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
target = x2ap_is_eNB_pci_in_list(target_pci);
DevAssert(target != NULL);
/* allocate x2ap ID */
id_manager = &instance_p->id_manager;
ue_id = x2ap_allocate_new_id(id_manager);
if (ue_id == -1) {
X2AP_ERROR("could not allocate a new X2AP UE ID\n");
/* TODO: cancel handover: send (to be defined) message to RRC */
exit(1);
}
/* id_source is ue_id, id_target is unknown yet */
x2ap_set_ids(id_manager, ue_id, x2ap_handover_req->rnti, ue_id, -1);
x2ap_id_set_state(id_manager, ue_id, X2ID_STATE_SOURCE_PREPARE);
x2ap_set_reloc_prep_timer(id_manager, ue_id,
x2ap_timer_get_tti(&instance_p->timers));
x2ap_id_set_target(id_manager, ue_id, target);
x2ap_eNB_generate_x2_handover_request(instance_p, target, x2ap_handover_req, ue_id);
}
static
void x2ap_eNB_handle_handover_req_ack(instance_t instance,
x2ap_handover_req_ack_t *x2ap_handover_req_ack)
{
/* TODO: remove this hack (the goal is to find the correct
* eNodeB structure for the other end) - we need a proper way for RRC
* and X2AP to identify eNodeBs
* RRC knows about mod_id and X2AP knows about eNB_id (eNB_ID in
* the configuration file)
* as far as I understand.. CROUX
*/
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *target;
int source_assoc_id = x2ap_handover_req_ack->source_assoc_id;
int ue_id;
int id_source;
int id_target;
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
target = x2ap_get_eNB(NULL, source_assoc_id, 0);
DevAssert(target != NULL);
/* rnti is a new information, save it */
ue_id = x2ap_handover_req_ack->x2_id_target;
id_source = x2ap_id_get_id_source(&instance_p->id_manager, ue_id);
id_target = ue_id;
x2ap_set_ids(&instance_p->id_manager, ue_id, x2ap_handover_req_ack->rnti, id_source, id_target);
x2ap_eNB_generate_x2_handover_request_ack(instance_p, target, x2ap_handover_req_ack);
}
static
void x2ap_eNB_handle_sgNB_add_req(instance_t instance,
x2ap_ENDC_sgnb_addition_req_t *x2ap_ENDC_sgnb_addition_req)
{
x2ap_id_manager *id_manager;
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *x2ap_eNB_data;
int ue_id;
LTE_PhysCellId_t target_pci;
target_pci = x2ap_ENDC_sgnb_addition_req->target_physCellId;
x2ap_eNB_data = x2ap_is_eNB_pci_in_list(target_pci);
DevAssert(x2ap_eNB_data != NULL);
DevAssert(x2ap_ENDC_sgnb_addition_req != NULL);
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
/* allocate x2ap ID */
id_manager = &instance_p->id_manager;
ue_id = x2ap_allocate_new_id(id_manager);
if (ue_id == -1) {
X2AP_ERROR("could not allocate a new X2AP UE ID\n");
/* TODO: cancel NSA: send (to be defined) message to RRC */
exit(1);
}
/* id_source is ue_id, id_target is unknown yet */
x2ap_set_ids(id_manager, ue_id, x2ap_ENDC_sgnb_addition_req->rnti, ue_id, -1);
x2ap_id_set_state(id_manager, ue_id, X2ID_STATE_NSA_ENB_PREPARE);
x2ap_set_dc_prep_timer(id_manager, ue_id,
x2ap_timer_get_tti(&instance_p->timers));
x2ap_id_set_target(id_manager, ue_id, x2ap_eNB_data);
x2ap_eNB_generate_ENDC_x2_SgNB_addition_request(instance_p, x2ap_ENDC_sgnb_addition_req,
x2ap_eNB_data, ue_id);
}
static
void x2ap_gNB_trigger_sgNB_add_req_ack(instance_t instance,
x2ap_ENDC_sgnb_addition_req_ACK_t *x2ap_ENDC_sgnb_addition_req_ACK)
{
/* TODO: remove this hack (the goal is to find the correct
* eNodeB structure for the other end) - we need a proper way for RRC
* and X2AP to identify eNodeBs
* RRC knows about mod_id and X2AP knows about eNB_id (eNB_ID in
* the configuration file)
* as far as I understand.. CROUX
*/
x2ap_id_manager *id_manager;
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *target;
int ue_id;
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
target = x2ap_get_eNB(NULL,x2ap_ENDC_sgnb_addition_req_ACK->target_assoc_id, 0);
DevAssert(target != NULL);
/* allocate x2ap ID */
id_manager = &instance_p->id_manager;
ue_id = x2ap_allocate_new_id(id_manager);
if (ue_id == -1) {
X2AP_ERROR("could not allocate a new X2AP UE ID\n");
exit(1);
}
/* id_Source is MeNB_ue_x2_id, id_target is rnti (rnti is SgNB_ue_x2_id) */
x2ap_set_ids(id_manager, ue_id,
x2ap_ENDC_sgnb_addition_req_ACK->SgNB_ue_x2_id,
x2ap_ENDC_sgnb_addition_req_ACK->MeNB_ue_x2_id,
x2ap_ENDC_sgnb_addition_req_ACK->SgNB_ue_x2_id);
x2ap_id_set_state(id_manager, ue_id, X2ID_STATE_NSA_GNB_OVERALL);
x2ap_set_dc_overall_timer(id_manager, ue_id,
x2ap_timer_get_tti(&instance_p->timers));
x2ap_id_set_target(id_manager, ue_id, target);
x2ap_gNB_generate_ENDC_x2_SgNB_addition_request_ACK(instance_p, target,
x2ap_ENDC_sgnb_addition_req_ACK, ue_id);
}
/**
* @fn x2ap_eNB_trigger_sgnb_reconfiguration_complete
*\brief: Function triggers sgnb reconfiguration complete
* @param : IN instance, IN x2ap_reconf_complete
**/
static
void x2ap_eNB_trigger_sgnb_reconfiguration_complete(instance_t instance,
x2ap_ENDC_reconf_complete_t *x2ap_reconf_complete)
{
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *target;
int id_source;
int id_target;
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
DevAssert(x2ap_reconf_complete != NULL);
target = x2ap_get_eNB(NULL,x2ap_reconf_complete->gnb_x2_assoc_id, 0);
DevAssert(target != NULL);
id_source = x2ap_reconf_complete->MeNB_ue_x2_id;
id_target = x2ap_reconf_complete->SgNB_ue_x2_id;
x2ap_eNB_generate_ENDC_x2_SgNB_reconfiguration_complete(instance_p, target, id_source, id_target);
}
static
void x2ap_eNB_ue_context_release(instance_t instance,
x2ap_ue_context_release_t *x2ap_ue_context_release)
{
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *target;
int source_assoc_id = x2ap_ue_context_release->source_assoc_id;
int ue_id;
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
target = x2ap_get_eNB(NULL, source_assoc_id, 0);
DevAssert(target != NULL);
x2ap_eNB_generate_x2_ue_context_release(instance_p, target, x2ap_ue_context_release);
/* free the X2AP UE ID */
ue_id = x2ap_find_id_from_rnti(&instance_p->id_manager, x2ap_ue_context_release->rnti);
if (ue_id == -1) {
X2AP_ERROR("could not find UE %x\n", x2ap_ue_context_release->rnti);
exit(1);
}
x2ap_release_id(&instance_p->id_manager, ue_id);
}
static
void x2ap_eNB_handle_sgNB_release_request(instance_t instance,
x2ap_ENDC_sgnb_release_request_t *x2ap_release_req)
{
x2ap_eNB_instance_t *instance_p;
x2ap_eNB_data_t *target;
instance_p = x2ap_eNB_get_instance(instance);
DevAssert(instance_p != NULL);
DevAssert(x2ap_release_req != NULL);
if (x2ap_release_req->rnti == -1 ||
x2ap_release_req->assoc_id == -1) {
X2AP_WARN("x2ap_eNB_handle_sgNB_release_request: bad rnti or assoc_id, do not send release request to gNB\n");
return;
}
target = x2ap_get_eNB(NULL, x2ap_release_req->assoc_id, 0);
if (target == NULL) {
X2AP_ERROR("no X2AP target eNB on assoc_id %d, dropping sgNB release request\n", x2ap_release_req->assoc_id);
/* x2ap_gNB_handle_ENDC_sGNB_release_request_acknowledge() would handle the
* ack, but does not do anything */
return;
}
/* id_source is not used by oai's gNB so it's not big deal. For
* interoperability with other gNBs things may need to be refined.
*/
x2ap_eNB_generate_ENDC_x2_SgNB_release_request(instance_p, target,
0, x2ap_release_req->rnti,
x2ap_release_req->cause);
}
void *x2ap_task(void *arg) {
MessageDef *received_msg = NULL;
int result;
X2AP_DEBUG("Starting X2AP layer\n");
x2ap_eNB_prepare_internal_data();
itti_mark_task_ready(TASK_X2AP);
while (1) {
itti_receive_msg(TASK_X2AP, &received_msg);
LOG_D(X2AP, "Received message %d:%s\n",
ITTI_MSG_ID(received_msg), ITTI_MSG_NAME(received_msg));
switch (ITTI_MSG_ID(received_msg)) {
case TERMINATE_MESSAGE:
X2AP_WARN(" *** Exiting X2AP thread\n");
itti_exit_task();
break;
case X2AP_SUBFRAME_PROCESS:
x2ap_check_timers(ITTI_MSG_DESTINATION_INSTANCE(received_msg));
break;
case X2AP_REGISTER_ENB_REQ:
x2ap_eNB_handle_register_eNB(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&X2AP_REGISTER_ENB_REQ(received_msg));
break;
case X2AP_HANDOVER_REQ:
x2ap_eNB_handle_handover_req(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&X2AP_HANDOVER_REQ(received_msg));
break;
case X2AP_HANDOVER_REQ_ACK:
x2ap_eNB_handle_handover_req_ack(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&X2AP_HANDOVER_REQ_ACK(received_msg));
break;
case X2AP_UE_CONTEXT_RELEASE:
x2ap_eNB_ue_context_release(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&X2AP_UE_CONTEXT_RELEASE(received_msg));
break;
case X2AP_ENDC_SGNB_ADDITION_REQ:
x2ap_eNB_handle_sgNB_add_req(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&X2AP_ENDC_SGNB_ADDITION_REQ(received_msg));
break;
case X2AP_ENDC_SGNB_ADDITION_REQ_ACK:
x2ap_gNB_trigger_sgNB_add_req_ack(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&X2AP_ENDC_SGNB_ADDITION_REQ_ACK(received_msg));
break;
case X2AP_ENDC_SGNB_RECONF_COMPLETE:
x2ap_eNB_trigger_sgnb_reconfiguration_complete(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&X2AP_ENDC_SGNB_RECONF_COMPLETE(received_msg));
break;
case X2AP_ENDC_SGNB_RELEASE_REQUEST:
x2ap_eNB_handle_sgNB_release_request(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&X2AP_ENDC_SGNB_RELEASE_REQUEST(received_msg));
break;
case SCTP_INIT_MSG_MULTI_CNF:
x2ap_eNB_handle_sctp_init_msg_multi_cnf(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&received_msg->ittiMsg.sctp_init_msg_multi_cnf);
break;
case SCTP_NEW_ASSOCIATION_RESP:
x2ap_eNB_handle_sctp_association_resp(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&received_msg->ittiMsg.sctp_new_association_resp);
break;
case SCTP_NEW_ASSOCIATION_IND:
x2ap_eNB_handle_sctp_association_ind(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&received_msg->ittiMsg.sctp_new_association_ind);
break;
case SCTP_DATA_IND:
x2ap_eNB_handle_sctp_data_ind(ITTI_MSG_DESTINATION_INSTANCE(received_msg),
&received_msg->ittiMsg.sctp_data_ind);
break;
default:
X2AP_ERROR("Received unhandled message: %d:%s\n",
ITTI_MSG_ID(received_msg), ITTI_MSG_NAME(received_msg));
break;
}
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;
}
return NULL;
}
#include "common/config/config_userapi.h"
int is_x2ap_enabled(void)
{
static volatile int config_loaded = 0;
static volatile int enabled = 0;
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
if (pthread_mutex_lock(&mutex)) goto mutex_error;
if (config_loaded) {
if (pthread_mutex_unlock(&mutex)) goto mutex_error;
return enabled;
}
char *enable_x2 = NULL;
paramdef_t p[] = {
{ "enable_x2", "yes/no", 0, .strptr=&enable_x2, .defstrval="", TYPE_STRING, 0 }
};
/* TODO: do it per module - we check only first eNB */
config_get(config_get_if(), p, sizeofArray(p), "eNBs.[0]");
if (enable_x2 != NULL && strcmp(enable_x2, "yes") == 0){
enabled = 1;
}
/*Consider also the case of enabling X2AP for a gNB by parsing a gNB configuration file*/
config_get(config_get_if(), p, sizeofArray(p), "gNBs.[0]");
if (enable_x2 != NULL && strcmp(enable_x2, "yes") == 0) {
enabled = 1;
}
config_loaded = 1;
if (pthread_mutex_unlock(&mutex)) goto mutex_error;
return enabled;
mutex_error:
LOG_E(X2AP, "mutex error\n");
exit(1);
}
void x2ap_trigger(void)
{
MessageDef *msg = itti_alloc_new_message(TASK_X2AP, 0, X2AP_SUBFRAME_PROCESS);
itti_send_msg_to_task(TASK_X2AP, 0, msg);
}
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