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openairinterface5g/openair2/SDAP/nr_sdap/nr_sdap_entity.c
T
Robert Schmidt 0f43c2c713 PDCP DL handling: unlock PDCP before forwarding PDU 
nr_pdcp_entity_recv_sdu() processes PDCP SDUs, and forwards the PDU at the
end of the function, while having the PDCP lock. This can lead to
deadlocks, e.g., when another thread goes through RLC and tries to
access the PDCP while the PDCP tries to lock the RLC.

This commit changes the logic: instead of having recv_sdu() forward the
PDU directly, it fills a buffer with the PDU (thus the name change to
process_sdu()), and returns. We then unlock the PDCP, before forwarding
the PDU, thus eliminating potential deadlocks.
2023-03-27 16:47:46 +02:00

491 lines
19 KiB
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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
*/
#include "nr_sdap_entity.h"
#include "common/utils/LOG/log.h"
#include <openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.h>
#include <openair3/ocp-gtpu/gtp_itf.h>
#include "openair2/LAYER2/nr_pdcp/nr_pdcp_ue_manager.h"
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
typedef struct {
nr_sdap_entity_t *sdap_entity_llist;
} nr_sdap_entity_info;
static nr_sdap_entity_info sdap_info;
instance_t *N3GTPUInst = NULL;
void nr_pdcp_submit_sdap_ctrl_pdu(ue_id_t ue_id, rb_id_t sdap_ctrl_pdu_drb, nr_sdap_ul_hdr_t ctrl_pdu)
{
protocol_ctxt_t ctxt = { .rntiMaybeUEid = ue_id };
nr_pdcp_data_req_drb(&ctxt,
SRB_FLAG_NO,
sdap_ctrl_pdu_drb,
RLC_MUI_UNDEFINED,
SDU_CONFIRM_NO,
SDAP_HDR_LENGTH,
(unsigned char *)&ctrl_pdu,
PDCP_TRANSMISSION_MODE_UNKNOWN,
NULL,
NULL);
LOG_D(SDAP, "Control PDU - Submitting Control PDU to DRB ID: %ld\n", sdap_ctrl_pdu_drb);
LOG_D(SDAP, "QFI: %u\n R: %u\n D/C: %u\n", ctrl_pdu.QFI, ctrl_pdu.R, ctrl_pdu.DC);
return;
}
static bool nr_sdap_tx_entity(nr_sdap_entity_t *entity,
protocol_ctxt_t *ctxt_p,
const srb_flag_t srb_flag,
const rb_id_t rb_id,
const mui_t mui,
const confirm_t confirm,
const sdu_size_t sdu_buffer_size,
unsigned char *const sdu_buffer,
const pdcp_transmission_mode_t pt_mode,
const uint32_t *sourceL2Id,
const uint32_t *destinationL2Id,
const uint8_t qfi,
const bool rqi) {
/* The offset of the SDAP header, it might be 0 if has_sdap_tx is not true in the pdcp entity. */
int offset=0;
bool ret = false;
/*Hardcode DRB ID given from upper layer (ue/enb_tun_read_thread rb_id), it will change if we have SDAP*/
rb_id_t sdap_drb_id = rb_id;
int pdcp_ent_has_sdap = 0;
if(sdu_buffer == NULL) {
LOG_E(SDAP, "%s:%d:%s: NULL sdu_buffer \n", __FILE__, __LINE__, __FUNCTION__);
exit(1);
}
uint8_t sdap_buf[SDAP_MAX_PDU];
rb_id_t pdcp_entity = entity->qfi2drb_map(entity, qfi, rb_id);
if(pdcp_entity){
sdap_drb_id = pdcp_entity;
pdcp_ent_has_sdap = entity->qfi2drb_table[qfi].has_sdap_tx;
LOG_D(SDAP, "TX - QFI: %u is mapped to DRB ID: %ld\n", qfi, entity->qfi2drb_table[qfi].drb_id);
}
if(!pdcp_ent_has_sdap){
LOG_D(SDAP, "TX - DRB ID: %ld does not have SDAP\n", entity->qfi2drb_table[qfi].drb_id);
ret = nr_pdcp_data_req_drb(ctxt_p,
srb_flag,
sdap_drb_id,
mui,
confirm,
sdu_buffer_size,
sdu_buffer,
pt_mode,
sourceL2Id,
destinationL2Id);
if(!ret)
LOG_E(SDAP, "%s:%d:%s: PDCP refused PDU\n", __FILE__, __LINE__, __FUNCTION__);
return ret;
}
if(sdu_buffer_size == 0 || sdu_buffer_size > 8999) {
LOG_E(SDAP, "%s:%d:%s: NULL or 0 or exceeded sdu_buffer_size (over max PDCP SDU)\n", __FILE__, __LINE__, __FUNCTION__);
return 0;
}
if(ctxt_p->enb_flag) { // gNB
offset = SDAP_HDR_LENGTH;
/*
* TS 37.324 4.4 Functions
* marking QoS flow ID in DL packets.
*
* Construct the DL SDAP data PDU.
*/
nr_sdap_dl_hdr_t sdap_hdr;
sdap_hdr.QFI = qfi;
sdap_hdr.RQI = rqi;
sdap_hdr.RDI = 0; // SDAP Hardcoded Value
/* Add the SDAP DL Header to the buffer */
memcpy(&sdap_buf[0], &sdap_hdr, SDAP_HDR_LENGTH);
memcpy(&sdap_buf[SDAP_HDR_LENGTH], sdu_buffer, sdu_buffer_size);
LOG_D(SDAP, "TX Entity QFI: %u \n", sdap_hdr.QFI);
LOG_D(SDAP, "TX Entity RQI: %u \n", sdap_hdr.RQI);
LOG_D(SDAP, "TX Entity RDI: %u \n", sdap_hdr.RDI);
} else { // nrUE
offset = SDAP_HDR_LENGTH;
/*
* TS 37.324 4.4 Functions
* marking QoS flow ID in UL packets.
*
* 5.2.1 Uplink
* construct the UL SDAP data PDU as specified in the subclause 6.2.2.3.
*/
nr_sdap_ul_hdr_t sdap_hdr;
sdap_hdr.QFI = qfi;
sdap_hdr.R = 0;
sdap_hdr.DC = rqi;
/* Add the SDAP UL Header to the buffer */
memcpy(&sdap_buf[0], &sdap_hdr, SDAP_HDR_LENGTH);
memcpy(&sdap_buf[SDAP_HDR_LENGTH], sdu_buffer, sdu_buffer_size);
LOG_D(SDAP, "TX Entity QFI: %u \n", sdap_hdr.QFI);
LOG_D(SDAP, "TX Entity R: %u \n", sdap_hdr.R);
LOG_D(SDAP, "TX Entity DC: %u \n", sdap_hdr.DC);
}
/*
* TS 37.324 5.2 Data transfer
* 5.2.1 Uplink UE side
* submit the constructed UL SDAP data PDU to the lower layers
*
* Downlink gNB side
*/
ret = nr_pdcp_data_req_drb(ctxt_p,
srb_flag,
sdap_drb_id,
mui,
confirm,
sdu_buffer_size + offset,
sdap_buf,
pt_mode,
sourceL2Id,
destinationL2Id);
if(!ret)
LOG_E(SDAP, "%s:%d:%s: PDCP refused PDU\n", __FILE__, __LINE__, __FUNCTION__);
return ret;
}
static void nr_sdap_rx_entity(nr_sdap_entity_t *entity,
rb_id_t pdcp_entity,
int is_gnb,
bool has_sdap_rx,
int pdusession_id,
ue_id_t ue_id,
char *buf,
int size) {
/* The offset of the SDAP header, it might be 0 if has_sdap_rx is not true in the pdcp entity. */
int offset=0;
if (is_gnb) { // gNB
if (has_sdap_rx) { // Handling the SDAP Header
offset = SDAP_HDR_LENGTH;
nr_sdap_ul_hdr_t *sdap_hdr = (nr_sdap_ul_hdr_t *)buf;
LOG_D(SDAP, "RX Entity Received QFI: %u\n", sdap_hdr->QFI);
LOG_D(SDAP, "RX Entity Received R bit: %u\n", sdap_hdr->R);
LOG_D(SDAP, "RX Entity Received DC bit: %u\n", sdap_hdr->DC);
switch (sdap_hdr->DC) {
case SDAP_HDR_UL_DATA_PDU:
LOG_D(SDAP, "RX Entity Received SDAP Data PDU\n");
break;
case SDAP_HDR_UL_CTRL_PDU:
LOG_D(SDAP, "RX Entity Received SDAP Control PDU\n");
break;
}
}
// Pushing SDAP SDU to GTP-U Layer
MessageDef *message_p = itti_alloc_new_message_sized(TASK_PDCP_ENB,
0,
GTPV1U_TUNNEL_DATA_REQ,
sizeof(gtpv1u_tunnel_data_req_t)
+ size + GTPU_HEADER_OVERHEAD_MAX - offset);
AssertFatal(message_p != NULL, "OUT OF MEMORY");
gtpv1u_tunnel_data_req_t *req = &GTPV1U_TUNNEL_DATA_REQ(message_p);
uint8_t *gtpu_buffer_p = (uint8_t *) (req + 1);
memcpy(gtpu_buffer_p + GTPU_HEADER_OVERHEAD_MAX, buf + offset, size - offset);
req->buffer = gtpu_buffer_p;
req->length = size - offset;
req->offset = GTPU_HEADER_OVERHEAD_MAX;
req->ue_id = ue_id;
req->bearer_id = pdusession_id;
LOG_D(SDAP, "%s() sending message to gtp size %d\n", __func__, size-offset);
// very very dirty hack gloabl var N3GTPUInst
itti_send_msg_to_task(TASK_GTPV1_U, *N3GTPUInst, message_p);
} else { //nrUE
/*
* TS 37.324 5.2 Data transfer
* 5.2.2 Downlink
* if the DRB from which this SDAP data PDU is received is configured by RRC with the presence of SDAP header.
*/
if (has_sdap_rx) { // Handling the SDAP Header
offset = SDAP_HDR_LENGTH;
/*
* TS 37.324 5.2 Data transfer
* 5.2.2 Downlink
* retrieve the SDAP SDU from the DL SDAP data PDU as specified in the subclause 6.2.2.2.
*/
nr_sdap_dl_hdr_t *sdap_hdr = (nr_sdap_dl_hdr_t *)buf;
LOG_D(SDAP, "RX Entity Received QFI : %u\n", sdap_hdr->QFI);
LOG_D(SDAP, "RX Entity Received RQI : %u\n", sdap_hdr->RQI);
LOG_D(SDAP, "RX Entity Received RDI : %u\n", sdap_hdr->RDI);
/*
* TS 37.324 5.2 Data transfer
* 5.2.2 Downlink
* Perform reflective QoS flow to DRB mapping as specified in the subclause 5.3.2.
*/
if(sdap_hdr->RDI == SDAP_REFLECTIVE_MAPPING) {
LOG_D(SDAP, "RX - Performing Reflective Mapping\n");
/*
* TS 37.324 5.3 QoS flow to DRB Mapping
* 5.3.2 Reflective mapping
* If there is no stored QoS flow to DRB mapping rule for the QoS flow and a default DRB is configured.
*/
if(!entity->qfi2drb_table[sdap_hdr->QFI].drb_id && entity->default_drb){
nr_sdap_ul_hdr_t sdap_ctrl_pdu = entity->sdap_construct_ctrl_pdu(sdap_hdr->QFI);
rb_id_t sdap_ctrl_pdu_drb = entity->sdap_map_ctrl_pdu(entity, pdcp_entity, SDAP_CTRL_PDU_MAP_DEF_DRB, sdap_hdr->QFI);
entity->sdap_submit_ctrl_pdu(ue_id, sdap_ctrl_pdu_drb, sdap_ctrl_pdu);
}
/*
* TS 37.324 5.3 QoS flow to DRB mapping
* 5.3.2 Reflective mapping
* if the stored QoS flow to DRB mapping rule for the QoS flow
* is different from the QoS flow to DRB mapping of the DL SDAP data PDU
* and
* the DRB according to the stored QoS flow to DRB mapping rule is configured by RRC
* with the presence of UL SDAP header
*/
if (pdcp_entity != entity->qfi2drb_table[sdap_hdr->QFI].drb_id) {
nr_sdap_ul_hdr_t sdap_ctrl_pdu = entity->sdap_construct_ctrl_pdu(sdap_hdr->QFI);
rb_id_t sdap_ctrl_pdu_drb = entity->sdap_map_ctrl_pdu(entity, pdcp_entity, SDAP_CTRL_PDU_MAP_RULE_DRB, sdap_hdr->QFI);
entity->sdap_submit_ctrl_pdu(ue_id, sdap_ctrl_pdu_drb, sdap_ctrl_pdu);
}
/*
* TS 37.324 5.3 QoS flow to DRB Mapping
* 5.3.2 Reflective mapping
* store the QoS flow to DRB mapping of the DL SDAP data PDU as the QoS flow to DRB mapping rule for the UL.
*/
entity->qfi2drb_table[sdap_hdr->QFI].drb_id = pdcp_entity;
}
/*
* TS 37.324 5.2 Data transfer
* 5.2.2 Downlink
* perform RQI handling as specified in the subclause 5.4
*/
if(sdap_hdr->RQI == SDAP_RQI_HANDLING) {
LOG_W(SDAP, "UE - TODD 5.4\n");
}
} /* else - retrieve the SDAP SDU from the DL SDAP data PDU as specified in the subclause 6.2.2.1 */
/*
* TS 37.324 5.2 Data transfer
* 5.2.2 Downlink
* deliver the retrieved SDAP SDU to the upper layer.
*/
extern int nas_sock_fd[];
int len = write(nas_sock_fd[0], &buf[offset], size-offset);
LOG_D(SDAP, "RX Entity len : %d\n", len);
LOG_D(SDAP, "RX Entity size : %d\n", size);
LOG_D(SDAP, "RX Entity offset : %d\n", offset);
if (len != size-offset)
LOG_E(SDAP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
}
}
void nr_sdap_qfi2drb_map_update(nr_sdap_entity_t *entity, uint8_t qfi, rb_id_t drb, bool has_sdap_rx, bool has_sdap_tx)
{
if(qfi < SDAP_MAX_QFI &&
qfi > SDAP_MAP_RULE_EMPTY &&
drb > 0 &&
drb <= AVLBL_DRB){
entity->qfi2drb_table[qfi].drb_id = drb;
entity->qfi2drb_table[qfi].has_sdap_rx = has_sdap_rx;
entity->qfi2drb_table[qfi].has_sdap_tx = has_sdap_tx;
LOG_D(SDAP, "Updated mapping: QFI %u -> DRB %ld \n", qfi, entity->qfi2drb_table[qfi].drb_id);
} else {
LOG_D(SDAP, "Map updated failed, QFI: %u, DRB: %ld\n", qfi, drb);
}
}
void nr_sdap_qfi2drb_map_del(nr_sdap_entity_t *entity, uint8_t qfi){
entity->qfi2drb_table[qfi].drb_id = SDAP_NO_MAPPING_RULE;
LOG_D(SDAP, "Deleted mapping for QFI: %u \n", qfi);
}
rb_id_t nr_sdap_qfi2drb_map(nr_sdap_entity_t *entity, uint8_t qfi, rb_id_t upper_layer_rb_id){
rb_id_t pdcp_entity;
pdcp_entity = entity->qfi2drb_table[qfi].drb_id;
if(pdcp_entity){
LOG_D(SDAP, "Mapping rule exists for QFI: %u\n", qfi);
return pdcp_entity;
} else if(entity->default_drb) {
LOG_D(SDAP, "Mapping QFI: %u to Default DRB: %ld\n", qfi, entity->default_drb);
entity->qfi2drb_map_update(entity, qfi, entity->default_drb, entity->qfi2drb_table[qfi].has_sdap_rx, entity->qfi2drb_table[qfi].has_sdap_tx);
return entity->default_drb;
} else {
LOG_D(SDAP, "Mapping rule and default DRB do not exist for QFI:%u\n", qfi);
return SDAP_MAP_RULE_EMPTY;
}
return pdcp_entity;
}
nr_sdap_ul_hdr_t nr_sdap_construct_ctrl_pdu(uint8_t qfi){
nr_sdap_ul_hdr_t sdap_end_marker_hdr;
sdap_end_marker_hdr.QFI = qfi;
sdap_end_marker_hdr.R = 0;
sdap_end_marker_hdr.DC = SDAP_HDR_UL_CTRL_PDU;
LOG_D(SDAP, "Constructed Control PDU with QFI:%u R:%u DC:%u \n", sdap_end_marker_hdr.QFI,
sdap_end_marker_hdr.R,
sdap_end_marker_hdr.DC);
return sdap_end_marker_hdr;
}
rb_id_t nr_sdap_map_ctrl_pdu(nr_sdap_entity_t *entity, rb_id_t pdcp_entity, int map_type, uint8_t dl_qfi){
rb_id_t drb_of_endmarker = 0;
if(map_type == SDAP_CTRL_PDU_MAP_DEF_DRB){
drb_of_endmarker = entity->default_drb;
LOG_D(SDAP, "Mapping Control PDU QFI: %u to Default DRB: %ld\n", dl_qfi, drb_of_endmarker);
}
if(map_type == SDAP_CTRL_PDU_MAP_RULE_DRB){
drb_of_endmarker = entity->qfi2drb_map(entity, dl_qfi, pdcp_entity);
LOG_D(SDAP, "Mapping Control PDU QFI: %u to DRB: %ld\n", dl_qfi, drb_of_endmarker);
}
return drb_of_endmarker;
}
void nr_sdap_submit_ctrl_pdu(ue_id_t ue_id, rb_id_t sdap_ctrl_pdu_drb, nr_sdap_ul_hdr_t ctrl_pdu)
{
if(sdap_ctrl_pdu_drb){
nr_pdcp_submit_sdap_ctrl_pdu(ue_id, sdap_ctrl_pdu_drb, ctrl_pdu);
LOG_D(SDAP, "Sent Control PDU to PDCP Layer.\n");
}
}
void nr_sdap_ue_qfi2drb_config(nr_sdap_entity_t *existing_sdap_entity, rb_id_t pdcp_entity, ue_id_t ue_id, NR_QFI_t *mapped_qfi_2_add, uint8_t mappedQFIs2AddCount, uint8_t drb_identity, bool has_sdap_rx, bool has_sdap_tx)
{
LOG_D(SDAP, "RRC Configuring SDAP Entity\n");
uint8_t qfi = 0;
for(int i = 0; i < mappedQFIs2AddCount; i++){
qfi = mapped_qfi_2_add[i];
if (existing_sdap_entity->default_drb && existing_sdap_entity->qfi2drb_table[qfi].drb_id == SDAP_NO_MAPPING_RULE) {
nr_sdap_ul_hdr_t sdap_ctrl_pdu = existing_sdap_entity->sdap_construct_ctrl_pdu(qfi);
rb_id_t sdap_ctrl_pdu_drb = existing_sdap_entity->sdap_map_ctrl_pdu(existing_sdap_entity, pdcp_entity, SDAP_CTRL_PDU_MAP_DEF_DRB, qfi);
existing_sdap_entity->sdap_submit_ctrl_pdu(ue_id, sdap_ctrl_pdu_drb, sdap_ctrl_pdu);
}
if (existing_sdap_entity->qfi2drb_table[qfi].drb_id != drb_identity && existing_sdap_entity->qfi2drb_table[qfi].has_sdap_tx) {
nr_sdap_ul_hdr_t sdap_ctrl_pdu = existing_sdap_entity->sdap_construct_ctrl_pdu(qfi);
rb_id_t sdap_ctrl_pdu_drb = existing_sdap_entity->sdap_map_ctrl_pdu(existing_sdap_entity, pdcp_entity, SDAP_CTRL_PDU_MAP_RULE_DRB, qfi);
existing_sdap_entity->sdap_submit_ctrl_pdu(ue_id, sdap_ctrl_pdu_drb, sdap_ctrl_pdu);
}
LOG_D(SDAP, "Storing the configured QoS flow to DRB mapping rule\n");
existing_sdap_entity->qfi2drb_map_update(existing_sdap_entity, qfi, drb_identity, has_sdap_rx, has_sdap_tx);
}
}
nr_sdap_entity_t *new_nr_sdap_entity(int is_gnb, bool has_sdap_rx, bool has_sdap_tx, ue_id_t ue_id, int pdusession_id, bool is_defaultDRB, uint8_t drb_identity, NR_QFI_t *mapped_qfi_2_add, uint8_t mappedQFIs2AddCount)
{
if (nr_sdap_get_entity(ue_id, pdusession_id)) {
LOG_E(SDAP, "SDAP Entity for UE already exists with RNTI/UE ID: %lu and PDU SESSION ID: %d\n", ue_id, pdusession_id);
nr_sdap_entity_t *existing_sdap_entity = nr_sdap_get_entity(ue_id, pdusession_id);
rb_id_t pdcp_entity = existing_sdap_entity->default_drb;
if(!is_gnb)
nr_sdap_ue_qfi2drb_config(existing_sdap_entity, pdcp_entity, ue_id, mapped_qfi_2_add, mappedQFIs2AddCount, drb_identity, has_sdap_rx, has_sdap_tx);
return existing_sdap_entity;
}
nr_sdap_entity_t *sdap_entity;
sdap_entity = calloc(1, sizeof(nr_sdap_entity_t));
if(sdap_entity == NULL) {
LOG_E(SDAP, "SDAP Entity creation failed, out of memory\n");
exit(1);
}
sdap_entity->ue_id = ue_id;
sdap_entity->pdusession_id = pdusession_id;
sdap_entity->tx_entity = nr_sdap_tx_entity;
sdap_entity->rx_entity = nr_sdap_rx_entity;
sdap_entity->sdap_construct_ctrl_pdu = nr_sdap_construct_ctrl_pdu;
sdap_entity->sdap_map_ctrl_pdu = nr_sdap_map_ctrl_pdu;
sdap_entity->sdap_submit_ctrl_pdu = nr_sdap_submit_ctrl_pdu;
sdap_entity->qfi2drb_map_update = nr_sdap_qfi2drb_map_update;
sdap_entity->qfi2drb_map_delete = nr_sdap_qfi2drb_map_del;
sdap_entity->qfi2drb_map = nr_sdap_qfi2drb_map;
if(is_defaultDRB) {
sdap_entity->default_drb = drb_identity;
LOG_I(SDAP, "Default DRB for the created SDAP entity: %ld \n", sdap_entity->default_drb);
LOG_D(SDAP, "RRC updating mapping rules: %d\n", mappedQFIs2AddCount);
for (int i = 0; i < mappedQFIs2AddCount; i++)
sdap_entity->qfi2drb_map_update(sdap_entity, mapped_qfi_2_add[i], sdap_entity->default_drb, has_sdap_rx, has_sdap_tx);
}
sdap_entity->next_entity = sdap_info.sdap_entity_llist;
sdap_info.sdap_entity_llist = sdap_entity;
return sdap_entity;
}
nr_sdap_entity_t *nr_sdap_get_entity(ue_id_t ue_id, int pdusession_id)
{
nr_sdap_entity_t *sdap_entity;
sdap_entity = sdap_info.sdap_entity_llist;
if(sdap_entity == NULL)
return NULL;
while ((sdap_entity->ue_id != ue_id || sdap_entity->pdusession_id != pdusession_id) && sdap_entity->next_entity != NULL) {
sdap_entity = sdap_entity->next_entity;
}
if (sdap_entity->ue_id == ue_id && sdap_entity->pdusession_id == pdusession_id)
return sdap_entity;
return NULL;
}
void delete_nr_sdap_entity(ue_id_t ue_id)
{
nr_sdap_entity_t *entityPtr, *entityPrev = NULL;
entityPtr = sdap_info.sdap_entity_llist;
if (entityPtr->ue_id == ue_id) {
sdap_info.sdap_entity_llist = sdap_info.sdap_entity_llist->next_entity;
free(entityPtr);
} else {
while (entityPtr->ue_id != ue_id && entityPtr->next_entity != NULL) {
entityPrev = entityPtr;
entityPtr = entityPtr->next_entity;
}
if (entityPtr->ue_id != ue_id) {
entityPrev->next_entity = entityPtr->next_entity;
free(entityPtr);
}
}
}
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