nr_pdcp_oai_api.c 39.5 KB
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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
 */

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#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
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#include "asn1_utils.h"
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#include "nr_pdcp_ue_manager.h"
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#include "nr_pdcp_timer_thread.h"
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#include "NR_RadioBearerConfig.h"
#include "NR_RLC-BearerConfig.h"
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#include "NR_RLC-Config.h"
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#include "NR_CellGroupConfig.h"
#include "openair2/RRC/NR/nr_rrc_proto.h"
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#include <stdint.h>
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/* from OAI */
#include "pdcp.h"
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#include "LAYER2/nr_rlc/nr_rlc_oai_api.h"
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#include <openair3/ocp-gtpu/gtp_itf.h>
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#define TODO do { \
    printf("%s:%d:%s: todo\n", __FILE__, __LINE__, __FUNCTION__); \
    exit(1); \
  } while (0)

static nr_pdcp_ue_manager_t *nr_pdcp_ue_manager;

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/* TODO: handle time a bit more properly */
static uint64_t nr_pdcp_current_time;
static int      nr_pdcp_current_time_last_frame;
static int      nr_pdcp_current_time_last_subframe;
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/* necessary globals for OAI, not used internally */
hash_table_t  *pdcp_coll_p;
static uint64_t pdcp_optmask;

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ngran_node_t node_type = ngran_gNB;
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uint8_t proto_agent_flag = 0;
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/****************************************************************************/
/* rlc_data_req queue - begin                                               */
/****************************************************************************/

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#include <pthread.h>

/* NR PDCP and RLC both use "big locks". In some cases a thread may do
 * lock(rlc) followed by lock(pdcp) (typically when running 'rx_sdu').
 * Another thread may first do lock(pdcp) and then lock(rlc) (typically
 * the GTP module calls 'pdcp_data_req' that, in a previous implementation
 * was indirectly calling 'rlc_data_req' which does lock(rlc)).
 * To avoid the resulting deadlock it is enough to ensure that a call
 * to lock(pdcp) will never be followed by a call to lock(rlc). So,
 * here we chose to have a separate thread that deals with rlc_data_req,
 * out of the PDCP lock. Other solutions may be possible.
 * So instead of calling 'rlc_data_req' directly we have a queue and a
 * separate thread emptying it.
 */

typedef struct {
  protocol_ctxt_t ctxt_pP;
  srb_flag_t      srb_flagP;
  MBMS_flag_t     MBMS_flagP;
  rb_id_t         rb_idP;
  mui_t           muiP;
  confirm_t       confirmP;
  sdu_size_t      sdu_sizeP;
  mem_block_t     *sdu_pP;
} rlc_data_req_queue_item;

#define RLC_DATA_REQ_QUEUE_SIZE 10000

typedef struct {
  rlc_data_req_queue_item q[RLC_DATA_REQ_QUEUE_SIZE];
  volatile int start;
  volatile int length;
  pthread_mutex_t m;
  pthread_cond_t c;
} rlc_data_req_queue;

static rlc_data_req_queue q;

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extern rlc_op_status_t nr_rrc_rlc_config_asn1_req (const protocol_ctxt_t   * const ctxt_pP,
    const NR_SRB_ToAddModList_t   * const srb2add_listP,
    const NR_DRB_ToAddModList_t   * const drb2add_listP,
    const NR_DRB_ToReleaseList_t  * const drb2release_listP,
    const LTE_PMCH_InfoList_r9_t * const pmch_InfoList_r9_pP,
    struct NR_CellGroupConfig__rlc_BearerToAddModList *rlc_bearer2add_list);

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static void *rlc_data_req_thread(void *_)
{
  int i;

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  pthread_setname_np(pthread_self(), "RLC queue");
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  while (1) {
    if (pthread_mutex_lock(&q.m) != 0) abort();
    while (q.length == 0)
      if (pthread_cond_wait(&q.c, &q.m) != 0) abort();
    i = q.start;
    if (pthread_mutex_unlock(&q.m) != 0) abort();

    rlc_data_req(&q.q[i].ctxt_pP,
                 q.q[i].srb_flagP,
                 q.q[i].MBMS_flagP,
                 q.q[i].rb_idP,
                 q.q[i].muiP,
                 q.q[i].confirmP,
                 q.q[i].sdu_sizeP,
                 q.q[i].sdu_pP,
                 NULL,
                 NULL);

    if (pthread_mutex_lock(&q.m) != 0) abort();

    q.length--;
    q.start = (q.start + 1) % RLC_DATA_REQ_QUEUE_SIZE;

    if (pthread_cond_signal(&q.c) != 0) abort();
    if (pthread_mutex_unlock(&q.m) != 0) abort();
  }
}

static void init_nr_rlc_data_req_queue(void)
{
  pthread_t t;

  pthread_mutex_init(&q.m, NULL);
  pthread_cond_init(&q.c, NULL);

  if (pthread_create(&t, NULL, rlc_data_req_thread, NULL) != 0) {
    LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
    exit(1);
  }
}

static void enqueue_rlc_data_req(const protocol_ctxt_t *const ctxt_pP,
                                 const srb_flag_t   srb_flagP,
                                 const MBMS_flag_t  MBMS_flagP,
                                 const rb_id_t      rb_idP,
                                 const mui_t        muiP,
                                 confirm_t    confirmP,
                                 sdu_size_t   sdu_sizeP,
                                 mem_block_t *sdu_pP,
                                 void *_unused1, void *_unused2)
{
  int i;
  int logged = 0;

  if (pthread_mutex_lock(&q.m) != 0) abort();
  while (q.length == RLC_DATA_REQ_QUEUE_SIZE) {
    if (!logged) {
      logged = 1;
      LOG_W(PDCP, "%s: rlc_data_req queue is full\n", __FUNCTION__);
    }
    if (pthread_cond_wait(&q.c, &q.m) != 0) abort();
  }

  i = (q.start + q.length) % RLC_DATA_REQ_QUEUE_SIZE;
  q.length++;

  q.q[i].ctxt_pP    = *ctxt_pP;
  q.q[i].srb_flagP  = srb_flagP;
  q.q[i].MBMS_flagP = MBMS_flagP;
  q.q[i].rb_idP     = rb_idP;
  q.q[i].muiP       = muiP;
  q.q[i].confirmP   = confirmP;
  q.q[i].sdu_sizeP  = sdu_sizeP;
  q.q[i].sdu_pP     = sdu_pP;

  if (pthread_cond_signal(&q.c) != 0) abort();
  if (pthread_mutex_unlock(&q.m) != 0) abort();
}

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void du_rlc_data_req(const protocol_ctxt_t *const ctxt_pP,
                     const srb_flag_t   srb_flagP,
                     const MBMS_flag_t  MBMS_flagP,
                     const rb_id_t      rb_idP,
                     const mui_t        muiP,
                     confirm_t    confirmP,
                     sdu_size_t   sdu_sizeP,
                     mem_block_t *sdu_pP)
{
  enqueue_rlc_data_req(ctxt_pP,
                       srb_flagP,
                       MBMS_flagP,
                       rb_idP, muiP,
                       confirmP,
                       sdu_sizeP,
                       sdu_pP,
                       NULL,
                       NULL);
}

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/****************************************************************************/
/* rlc_data_req queue - end                                                 */
/****************************************************************************/

/****************************************************************************/
/* hacks to be cleaned up at some point - begin                             */
/****************************************************************************/

#include "LAYER2/MAC/mac_extern.h"

static void reblock_tun_socket(void)
{
  extern int nas_sock_fd[];
  int f;

  f = fcntl(nas_sock_fd[0], F_GETFL, 0);
  f &= ~(O_NONBLOCK);
  if (fcntl(nas_sock_fd[0], F_SETFL, f) == -1) {
    LOG_E(PDCP, "reblock_tun_socket failed\n");
    exit(1);
  }
}

static void *enb_tun_read_thread(void *_)
{
  extern int nas_sock_fd[];
  char rx_buf[NL_MAX_PAYLOAD];
  int len;
  int rnti;
  protocol_ctxt_t ctxt;

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  int rb_id = 1;
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  pthread_setname_np( pthread_self(),"enb_tun_read");
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  while (1) {
    len = read(nas_sock_fd[0], &rx_buf, NL_MAX_PAYLOAD);
    if (len == -1) {
      LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
      exit(1);
    }

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    LOG_D(PDCP, "%s(): nas_sock_fd read returns len %d\n", __func__, len);
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    nr_pdcp_manager_lock(nr_pdcp_ue_manager);
    rnti = nr_pdcp_get_first_rnti(nr_pdcp_ue_manager);
    nr_pdcp_manager_unlock(nr_pdcp_ue_manager);

    if (rnti == -1) continue;

    ctxt.module_id = 0;
    ctxt.enb_flag = 1;
    ctxt.instance = 0;
    ctxt.frame = 0;
    ctxt.subframe = 0;
    ctxt.eNB_index = 0;
    ctxt.configured = 1;
    ctxt.brOption = 0;

    ctxt.rnti = rnti;

    pdcp_data_req(&ctxt, SRB_FLAG_NO, rb_id, RLC_MUI_UNDEFINED,
                  RLC_SDU_CONFIRM_NO, len, (unsigned char *)rx_buf,
                  PDCP_TRANSMISSION_MODE_DATA, NULL, NULL);
  }

  return NULL;
}

static void *ue_tun_read_thread(void *_)
{
  extern int nas_sock_fd[];
  char rx_buf[NL_MAX_PAYLOAD];
  int len;
  int rnti;
  protocol_ctxt_t ctxt;

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  int rb_id = 1;
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  pthread_setname_np( pthread_self(),"ue_tun_read"); 
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  while (1) {
    len = read(nas_sock_fd[0], &rx_buf, NL_MAX_PAYLOAD);
    if (len == -1) {
      LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
      exit(1);
    }

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    LOG_D(PDCP, "%s(): nas_sock_fd read returns len %d\n", __func__, len);
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    nr_pdcp_manager_lock(nr_pdcp_ue_manager);
    rnti = nr_pdcp_get_first_rnti(nr_pdcp_ue_manager);
    nr_pdcp_manager_unlock(nr_pdcp_ue_manager);

    if (rnti == -1) continue;

    ctxt.module_id = 0;
    ctxt.enb_flag = 0;
    ctxt.instance = 0;
    ctxt.frame = 0;
    ctxt.subframe = 0;
    ctxt.eNB_index = 0;
    ctxt.configured = 1;
    ctxt.brOption = 0;

    ctxt.rnti = rnti;

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    pdcp_data_req(&ctxt, SRB_FLAG_NO, rb_id, RLC_MUI_UNDEFINED,
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                  RLC_SDU_CONFIRM_NO, len, (unsigned char *)rx_buf,
                  PDCP_TRANSMISSION_MODE_DATA, NULL, NULL);
  }

  return NULL;
}

static void start_pdcp_tun_enb(void)
{
  pthread_t t;

  reblock_tun_socket();

  if (pthread_create(&t, NULL, enb_tun_read_thread, NULL) != 0) {
    LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
    exit(1);
  }
}

static void start_pdcp_tun_ue(void)
{
  pthread_t t;

  reblock_tun_socket();

  if (pthread_create(&t, NULL, ue_tun_read_thread, NULL) != 0) {
    LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
    exit(1);
  }
}

/****************************************************************************/
/* hacks to be cleaned up at some point - end                               */
/****************************************************************************/

int pdcp_fifo_flush_sdus(const protocol_ctxt_t *const ctxt_pP)
{
  return 0;
}

void pdcp_layer_init(void)
{
  /* hack: be sure to initialize only once */
  static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
  static int initialized = 0;
  if (pthread_mutex_lock(&m) != 0) abort();
  if (initialized) {
    if (pthread_mutex_unlock(&m) != 0) abort();
    return;
  }
  initialized = 1;
  if (pthread_mutex_unlock(&m) != 0) abort();

  nr_pdcp_ue_manager = new_nr_pdcp_ue_manager(1);
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  if ((RC.nrrrc == NULL) || (!NODE_IS_CU(RC.nrrrc[0]->node_type))) {
    init_nr_rlc_data_req_queue();
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  }

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  nr_pdcp_init_timer_thread(nr_pdcp_ue_manager);
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}

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#include "nfapi/oai_integration/vendor_ext.h"
#include "targets/RT/USER/lte-softmodem.h"
#include "openair2/RRC/NAS/nas_config.h"

uint64_t pdcp_module_init(uint64_t _pdcp_optmask)
{
  /* hack: be sure to initialize only once */
  static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
  static int initialized = 0;
  if (pthread_mutex_lock(&m) != 0) abort();
  if (initialized) {
    abort();
  }
  initialized = 1;
  if (pthread_mutex_unlock(&m) != 0) abort();

#if 0
  pdcp_optmask = _pdcp_optmask;
  return pdcp_optmask;
#endif
  /* temporary enforce netlink when UE_NAS_USE_TUN is set,
     this is while switching from noS1 as build option
     to noS1 as config option                               */
  if ( _pdcp_optmask & UE_NAS_USE_TUN_BIT) {
    pdcp_optmask = pdcp_optmask | PDCP_USE_NETLINK_BIT ;
  }

  pdcp_optmask = pdcp_optmask | _pdcp_optmask ;
  LOG_I(PDCP, "pdcp init,%s %s\n",
        ((LINK_ENB_PDCP_TO_GTPV1U)?"usegtp":""),
        ((PDCP_USE_NETLINK)?"usenetlink":""));

  if (PDCP_USE_NETLINK) {
    nas_getparams();

    if(UE_NAS_USE_TUN) {
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      int num_if = (NFAPI_MODE == NFAPI_UE_STUB_PNF || IS_SOFTMODEM_SIML1 )? MAX_MOBILES_PER_ENB : 1;
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      netlink_init_tun("ue",num_if);
      //Add --nr-ip-over-lte option check for next line
      if (IS_SOFTMODEM_NOS1)
          nas_config(1, 1, 2, "ue");
      LOG_I(PDCP, "UE pdcp will use tun interface\n");
      start_pdcp_tun_ue();
    } else if(ENB_NAS_USE_TUN) {
      netlink_init_tun("enb",1);
      nas_config(1, 1, 1, "enb");
      LOG_I(PDCP, "ENB pdcp will use tun interface\n");
      start_pdcp_tun_enb();
    } else {
      LOG_I(PDCP, "pdcp will use kernel modules\n");
      abort();
      netlink_init();
    }
  }
  return pdcp_optmask ;
}
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static void deliver_sdu_drb(void *_ue, nr_pdcp_entity_t *entity,
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                            char *buf, int size)
{
  extern int nas_sock_fd[];
  int len;
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  nr_pdcp_ue_t *ue = _ue;
  MessageDef  *message_p;
  uint8_t     *gtpu_buffer_p;
  int rb_id;
  int i;

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  if(UE_NAS_USE_TUN){
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    LOG_D(PDCP, "IP packet received, to be sent to UE TUN interface");
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    len = write(nas_sock_fd[0], buf, size);
    if (len != size) {
      LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
    }
  }
  else{
    for (i = 0; i < 5; i++) {
        if (entity == ue->drb[i]) {
          rb_id = i+1;
          goto rb_found;
        }
      }

      LOG_E(PDCP, "%s:%d:%s: fatal, no RB found for ue %d\n",
            __FILE__, __LINE__, __FUNCTION__, ue->rnti);
      exit(1);

    rb_found:
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    {
      int offset=0;
      if (entity->has_sdap == 1 && entity->has_sdapULheader == 1) offset = 1; // this is the offset of the SDAP header in bytes

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      gtpu_buffer_p = itti_malloc(TASK_PDCP_ENB, TASK_GTPV1_U,
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                                  size + GTPU_HEADER_OVERHEAD_MAX - offset);
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      AssertFatal(gtpu_buffer_p != NULL, "OUT OF MEMORY");
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      memcpy(&gtpu_buffer_p[GTPU_HEADER_OVERHEAD_MAX], buf+offset, size-offset);
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      message_p = itti_alloc_new_message(TASK_PDCP_ENB, 0, GTPV1U_GNB_TUNNEL_DATA_REQ);
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      AssertFatal(message_p != NULL, "OUT OF MEMORY");
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      GTPV1U_GNB_TUNNEL_DATA_REQ(message_p).buffer              = gtpu_buffer_p;
      GTPV1U_GNB_TUNNEL_DATA_REQ(message_p).length              = size-offset;
      GTPV1U_GNB_TUNNEL_DATA_REQ(message_p).offset              = GTPU_HEADER_OVERHEAD_MAX;
      GTPV1U_GNB_TUNNEL_DATA_REQ(message_p).rnti                = ue->rnti;
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      GTPV1U_GNB_TUNNEL_DATA_REQ(message_p).pdusession_id       = entity->pdusession_id;
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      if (offset==1) LOG_I(PDCP, "%s() (drb %d) SDAP header %2x\n",__func__, rb_id, buf[0]);
      LOG_D(PDCP, "%s() (drb %d) sending message to gtp size %d\n", __func__, rb_id, size-offset);
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      itti_send_msg_to_task(TASK_VARIABLE, INSTANCE_DEFAULT, message_p);
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   }
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  }
}

static void deliver_pdu_drb(void *_ue, nr_pdcp_entity_t *entity,
                            char *buf, int size, int sdu_id)
{
  nr_pdcp_ue_t *ue = _ue;
  int rb_id;
  protocol_ctxt_t ctxt;
  int i;
  mem_block_t *memblock;

  for (i = 0; i < 5; i++) {
    if (entity == ue->drb[i]) {
      rb_id = i+1;
      goto rb_found;
    }
  }

  LOG_E(PDCP, "%s:%d:%s: fatal, no RB found for ue %d\n",
        __FILE__, __LINE__, __FUNCTION__, ue->rnti);
  exit(1);

rb_found:
  ctxt.module_id = 0;
  ctxt.enb_flag = 1;
  ctxt.instance = 0;
  ctxt.frame = 0;
  ctxt.subframe = 0;
  ctxt.eNB_index = 0;
  ctxt.configured = 1;
  ctxt.brOption = 0;

  ctxt.rnti = ue->rnti;

  memblock = get_free_mem_block(size, __FUNCTION__);
  memcpy(memblock->data, buf, size);

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  LOG_D(PDCP, "%s(): (srb %d) calling rlc_data_req size %d\n", __func__, rb_id, size);
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  //for (i = 0; i < size; i++) printf(" %2.2x", (unsigned char)memblock->data[i]);
  //printf("\n");
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  enqueue_rlc_data_req(&ctxt, 0, MBMS_FLAG_NO, rb_id, sdu_id, 0, size, memblock, NULL, NULL);
}

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static void deliver_sdu_srb(void *_ue, nr_pdcp_entity_t *entity,
                            char *buf, int size)
{
  nr_pdcp_ue_t *ue = _ue;
  int srb_id;
  int i;

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  for (i = 0; i < sizeofArray(ue->srb) ; i++) {
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    if (entity == ue->srb[i]) {
      srb_id = i+1;
      goto srb_found;
    }
  }

  LOG_E(PDCP, "%s:%d:%s: fatal, no SRB found for ue %d\n",
	__FILE__, __LINE__, __FUNCTION__, ue->rnti);
  exit(1);
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 srb_found:
  {
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       uint8_t *rrc_buffer_p = entity->is_gnb ?
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					itti_malloc(TASK_PDCP_ENB, TASK_RRC_GNB, size):
                                        itti_malloc(TASK_PDCP_UE, TASK_RRC_NRUE, size);
       MessageDef  *message_p;

       AssertFatal(rrc_buffer_p != NULL, "OUT OF MEMORY");
       memcpy(rrc_buffer_p, buf, size);
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       message_p = entity->is_gnb ?
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                            itti_alloc_new_message(TASK_PDCP_ENB, 0, NR_RRC_DCCH_DATA_IND):
                            itti_alloc_new_message(TASK_PDCP_UE, 0, NR_RRC_DCCH_DATA_IND);

       AssertFatal(message_p != NULL, "OUT OF MEMORY");
       NR_RRC_DCCH_DATA_IND(message_p).dcch_index = srb_id;
       NR_RRC_DCCH_DATA_IND(message_p).sdu_p = rrc_buffer_p;
       NR_RRC_DCCH_DATA_IND(message_p).sdu_size = size;
       NR_RRC_DCCH_DATA_IND(message_p).rnti = ue->rnti;
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       itti_send_msg_to_task(entity->is_gnb ? TASK_RRC_GNB : TASK_RRC_NRUE, 0, message_p);
    }
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}

static void deliver_pdu_srb(void *_ue, nr_pdcp_entity_t *entity,
                            char *buf, int size, int sdu_id)
{
  nr_pdcp_ue_t *ue = _ue;
  int srb_id;
  protocol_ctxt_t ctxt;
  int i;
  mem_block_t *memblock;

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  for (i = 0; i < sizeofArray(ue->srb) ; i++) {
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    if (entity == ue->srb[i]) {
      srb_id = i+1;
      goto srb_found;
    }
  }

  LOG_E(PDCP, "%s:%d:%s: fatal, no SRB found for ue %d\n",
        __FILE__, __LINE__, __FUNCTION__, ue->rnti);
  exit(1);

srb_found:


  LOG_D(PDCP, "%s(): (srb %d) calling rlc_data_req size %d\n", __func__, srb_id, size);
  //for (i = 0; i < size; i++) printf(" %2.2x", (unsigned char)memblock->data[i]);
  //printf("\n");
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  if ((RC.nrrrc == NULL) || (!NODE_IS_CU(RC.nrrrc[0]->node_type))) {
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    ctxt.module_id = 0;
    ctxt.enb_flag = 1;
    ctxt.instance = 0;
    ctxt.frame = 0;
    ctxt.subframe = 0;
    ctxt.eNB_index = 0;
    ctxt.configured = 1;
    ctxt.brOption = 0;
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    ctxt.rnti = ue->rnti;
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    memblock = get_free_mem_block(size, __FUNCTION__);
    memcpy(memblock->data, buf, size);
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    enqueue_rlc_data_req(&ctxt, 1, MBMS_FLAG_NO, srb_id, sdu_id, 0, size, memblock, NULL, NULL);
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  }
  else {
    MessageDef  *message_p = itti_alloc_new_message (TASK_RRC_GNB, 0, F1AP_DL_RRC_MESSAGE);
    F1AP_DL_RRC_MESSAGE (message_p).rrc_container        = (uint8_t*)buf;
    F1AP_DL_RRC_MESSAGE (message_p).rrc_container_length = size;
    F1AP_DL_RRC_MESSAGE (message_p).gNB_CU_ue_id         = 0;
    F1AP_DL_RRC_MESSAGE (message_p).gNB_DU_ue_id         = 0;
    F1AP_DL_RRC_MESSAGE (message_p).old_gNB_DU_ue_id     = 0xFFFFFFFF; // unknown
    F1AP_DL_RRC_MESSAGE (message_p).rnti                 = ue->rnti;
    F1AP_DL_RRC_MESSAGE (message_p).srb_id               = srb_id;
    F1AP_DL_RRC_MESSAGE (message_p).execute_duplication  = 1;
    F1AP_DL_RRC_MESSAGE (message_p).RAT_frequency_priority_information.en_dc = 0;
    itti_send_msg_to_task (TASK_CU_F1, 0, message_p);
    LOG_D(PDCP, "Send F1AP_DL_RRC_MESSAGE with ITTI\n");
  }
}

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boolean_t pdcp_data_ind(
  const protocol_ctxt_t *const  ctxt_pP,
  const srb_flag_t srb_flagP,
  const MBMS_flag_t MBMS_flagP,
  const rb_id_t rb_id,
  const sdu_size_t sdu_buffer_size,
  mem_block_t *const sdu_buffer)
{
  nr_pdcp_ue_t *ue;
  nr_pdcp_entity_t *rb;
  int rnti = ctxt_pP->rnti;

  if (ctxt_pP->module_id != 0 ||
      //ctxt_pP->enb_flag != 1 ||
      ctxt_pP->instance != 0 ||
      ctxt_pP->eNB_index != 0 ||
      ctxt_pP->configured != 1 ||
      ctxt_pP->brOption != 0) {
    LOG_E(PDCP, "%s:%d:%s: fatal\n", __FILE__, __LINE__, __FUNCTION__);
    exit(1);
  }

  if (ctxt_pP->enb_flag)
    T(T_ENB_PDCP_UL, T_INT(ctxt_pP->module_id), T_INT(rnti),
      T_INT(rb_id), T_INT(sdu_buffer_size));

  nr_pdcp_manager_lock(nr_pdcp_ue_manager);
  ue = nr_pdcp_manager_get_ue(nr_pdcp_ue_manager, rnti);

  if (srb_flagP == 1) {
    if (rb_id < 1 || rb_id > 2)
      rb = NULL;
    else
      rb = ue->srb[rb_id - 1];
  } else {
    if (rb_id < 1 || rb_id > 5)
      rb = NULL;
    else
      rb = ue->drb[rb_id - 1];
  }

  if (rb != NULL) {
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    rb->recv_pdu(rb, (char *)sdu_buffer->data, sdu_buffer_size);
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  } else {
    LOG_E(PDCP, "%s:%d:%s: fatal: no RB found (rb_id %ld, srb_flag %d)\n",
          __FILE__, __LINE__, __FUNCTION__, rb_id, srb_flagP);
    exit(1);
  }

  nr_pdcp_manager_unlock(nr_pdcp_ue_manager);

  free_mem_block(sdu_buffer, __FUNCTION__);

  return 1;
}

void pdcp_run(const protocol_ctxt_t *const  ctxt_pP)
{
  MessageDef      *msg_p;
  int             result;
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  protocol_ctxt_t ctxt={.module_id=0,
                        .enb_flag=1,
                        .instance=0,
                        .rnti=0,
                        .frame=-1,
                        .subframe=-1,
                        .eNB_index=0,
                        .configured=true,
                        .brOption=false
                       };

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  while (1) {
    itti_poll_msg(ctxt_pP->enb_flag ? TASK_PDCP_ENB : TASK_PDCP_UE, &msg_p);
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    if (msg_p == NULL){
     break;
    }
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    switch (ITTI_MSG_ID(msg_p)) {
    case RRC_DCCH_DATA_REQ:
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      LOG_D(PDCP, "Received RRC_DCCH_DATA_REQ type at PDCP task \n");
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      PROTOCOL_CTXT_SET_BY_MODULE_ID(
          &ctxt,
          RRC_DCCH_DATA_REQ(msg_p).module_id,
          RRC_DCCH_DATA_REQ(msg_p).enb_flag,
          RRC_DCCH_DATA_REQ(msg_p).rnti,
          RRC_DCCH_DATA_REQ(msg_p).frame,
          0,
          RRC_DCCH_DATA_REQ(msg_p).eNB_index);
      result = pdcp_data_req(&ctxt,
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                             SRB_FLAG_YES,
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                             RRC_DCCH_DATA_REQ(msg_p).rb_id,
                             RRC_DCCH_DATA_REQ(msg_p).muip,
                             RRC_DCCH_DATA_REQ(msg_p).confirmp,
                             RRC_DCCH_DATA_REQ(msg_p).sdu_size,
                             RRC_DCCH_DATA_REQ(msg_p).sdu_p,
                             RRC_DCCH_DATA_REQ(msg_p).mode,
                             NULL, NULL);

      if (result != TRUE)
        LOG_E(PDCP, "PDCP data request failed!\n");
      result = itti_free(ITTI_MSG_ORIGIN_ID(msg_p), RRC_DCCH_DATA_REQ(msg_p).sdu_p);
      AssertFatal(result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
      break;
    default:
      LOG_E(PDCP, "Received unexpected message %s\n", ITTI_MSG_NAME(msg_p));
      break;
    }
  }
}

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static void add_srb(int is_gnb, int rnti, struct NR_SRB_ToAddMod *s)
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{
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  nr_pdcp_entity_t *pdcp_srb;
  nr_pdcp_ue_t *ue;
  int t_Reordering=3000;

  int srb_id = s->srb_Identity;
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  if (s->pdcp_Config == NULL ||
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      s->pdcp_Config->t_Reordering == NULL) t_Reordering = 3000;
  else t_Reordering = decode_t_reordering(*s->pdcp_Config->t_Reordering);

  nr_pdcp_manager_lock(nr_pdcp_ue_manager);
  ue = nr_pdcp_manager_get_ue(nr_pdcp_ue_manager, rnti);
  if (ue->srb[srb_id-1] != NULL) {
    LOG_D(PDCP, "%s:%d:%s: warning SRB %d already exist for ue %d, do nothing\n",
          __FILE__, __LINE__, __FUNCTION__, srb_id, rnti);
  } else {
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    pdcp_srb = new_nr_pdcp_entity(NR_PDCP_SRB, is_gnb, srb_id,
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                                  0, 0, 0, 0, // sdap parameters
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                                  deliver_sdu_srb, ue, deliver_pdu_srb, ue,
                                  12, t_Reordering, -1,
                                  0, 0,
                                  NULL, NULL);
    nr_pdcp_ue_add_srb_pdcp_entity(ue, srb_id, pdcp_srb);

    LOG_D(PDCP, "%s:%d:%s: added srb %d to ue rnti %x\n", __FILE__, __LINE__, __FUNCTION__, srb_id, rnti);
  }
  nr_pdcp_manager_unlock(nr_pdcp_ue_manager);
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}

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static void add_drb_am(int is_gnb, int rnti, struct NR_DRB_ToAddMod *s,
                       int ciphering_algorithm,
                       int integrity_algorithm,
                       unsigned char *ciphering_key,
                       unsigned char *integrity_key)
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{
  nr_pdcp_entity_t *pdcp_drb;
  nr_pdcp_ue_t *ue;

  int drb_id = s->drb_Identity;
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  int sn_size_ul = decode_sn_size_ul(*s->pdcp_Config->drb->pdcp_SN_SizeUL);
  int sn_size_dl = decode_sn_size_dl(*s->pdcp_Config->drb->pdcp_SN_SizeDL);
  int discard_timer = decode_discard_timer(*s->pdcp_Config->drb->discardTimer);

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  int t_reordering = -1;
  if (s->pdcp_Config->t_Reordering != NULL) {
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    t_reordering = decode_t_reordering(*s->pdcp_Config->t_Reordering);
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  }
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  if ((!s->cnAssociation) || s->cnAssociation->present == NR_DRB_ToAddMod__cnAssociation_PR_NOTHING) {
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    LOG_E(PDCP,"%s:%d:%s: fatal, cnAssociation is missing or present is NR_DRB_ToAddMod__cnAssociation_PR_NOTHING\n",__FILE__,__LINE__,__FUNCTION__);
    exit(-1);
  }
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  int pdusession_id;
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  int has_sdap = 0;
  int has_sdapULheader=0;
  int has_sdapDLheader=0;
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  if (s->cnAssociation->present == NR_DRB_ToAddMod__cnAssociation_PR_eps_BearerIdentity)
     pdusession_id = s->cnAssociation->choice.eps_BearerIdentity;
  else {
    if (!s->cnAssociation->choice.sdap_Config) {
      LOG_E(PDCP,"%s:%d:%s: fatal, sdap_Config is null",__FILE__,__LINE__,__FUNCTION__);
      exit(-1);
    }
    pdusession_id = s->cnAssociation->choice.sdap_Config->pdu_Session;
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    has_sdap = 1;
    has_sdapULheader = s->cnAssociation->choice.sdap_Config->sdap_HeaderUL == NR_SDAP_Config__sdap_HeaderUL_present ? 1 : 0;
    has_sdapDLheader = s->cnAssociation->choice.sdap_Config->sdap_HeaderDL == NR_SDAP_Config__sdap_HeaderDL_present ? 1 : 0;
    if (has_sdapDLheader==1) {
      LOG_E(PDCP,"%s:%d:%s: fatal, no support for SDAP DL yet\n",__FILE__,__LINE__,__FUNCTION__);
      exit(-1);
    }
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  }
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  /* TODO(?): accept different UL and DL SN sizes? */
  if (sn_size_ul != sn_size_dl) {
    LOG_E(PDCP, "%s:%d:%s: fatal, bad SN sizes, must be same. ul=%d, dl=%d\n",
          __FILE__, __LINE__, __FUNCTION__, sn_size_ul, sn_size_dl);
    exit(1);
  }
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  if (drb_id != 1) {
    LOG_E(PDCP, "%s:%d:%s: fatal, bad drb id %d\n",
          __FILE__, __LINE__, __FUNCTION__, drb_id);
    exit(1);
  }

  nr_pdcp_manager_lock(nr_pdcp_ue_manager);
  ue = nr_pdcp_manager_get_ue(nr_pdcp_ue_manager, rnti);
  if (ue->drb[drb_id-1] != NULL) {
    LOG_D(PDCP, "%s:%d:%s: warning DRB %d already exist for ue %d, do nothing\n",
          __FILE__, __LINE__, __FUNCTION__, drb_id, rnti);
  } else {
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    pdcp_drb = new_nr_pdcp_entity(NR_PDCP_DRB_AM, is_gnb, drb_id,pdusession_id,has_sdap,
                                  has_sdapULheader,has_sdapDLheader,
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                                  deliver_sdu_drb, ue, deliver_pdu_drb, ue,
                                  sn_size_dl, t_reordering, discard_timer,
                                  ciphering_algorithm, integrity_algorithm,
                                  ciphering_key, integrity_key);
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    nr_pdcp_ue_add_drb_pdcp_entity(ue, drb_id, pdcp_drb);

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    LOG_D(PDCP, "%s:%d:%s: added drb %d to ue rnti %x\n", __FILE__, __LINE__, __FUNCTION__, drb_id, rnti);
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  }
  nr_pdcp_manager_unlock(nr_pdcp_ue_manager);
}

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static void add_drb(int is_gnb, int rnti, struct NR_DRB_ToAddMod *s,
                    NR_RLC_Config_t *rlc_Config,
                    int ciphering_algorithm,
                    int integrity_algorithm,
                    unsigned char *ciphering_key,
                    unsigned char *integrity_key)
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{
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  switch (rlc_Config->present) {
  case NR_RLC_Config_PR_am:
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    add_drb_am(is_gnb, rnti, s, ciphering_algorithm, integrity_algorithm,
               ciphering_key, integrity_key);
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    break;
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  case NR_RLC_Config_PR_um_Bi_Directional:
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    //add_drb_um(rnti, s);
    /* hack */
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    add_drb_am(is_gnb, rnti, s, ciphering_algorithm, integrity_algorithm,
               ciphering_key, integrity_key);
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    break;
  default:
    LOG_E(PDCP, "%s:%d:%s: fatal: unhandled DRB type\n",
          __FILE__, __LINE__, __FUNCTION__);
    exit(1);
  }
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  LOG_I(PDCP, "%s:%s:%d: added DRB for UE RNTI %x\n", __FILE__, __FUNCTION__, __LINE__, rnti);
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}

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boolean_t nr_rrc_pdcp_config_asn1_req(
  const protocol_ctxt_t *const  ctxt_pP,
  NR_SRB_ToAddModList_t  *const srb2add_list,
  NR_DRB_ToAddModList_t  *const drb2add_list,
  NR_DRB_ToReleaseList_t *const drb2release_list,
  const uint8_t                   security_modeP,
  uint8_t                  *const kRRCenc,
  uint8_t                  *const kRRCint,
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  uint8_t                  *const kUPenc,
  uint8_t                  *const kUPint
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#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
  ,LTE_PMCH_InfoList_r9_t  *pmch_InfoList_r9
#endif
  ,rb_id_t                 *const defaultDRB,
  struct NR_CellGroupConfig__rlc_BearerToAddModList *rlc_bearer2add_list)
  //struct NR_RLC_Config     *rlc_Config)
{
  int rnti = ctxt_pP->rnti;
  int i;

  if (//ctxt_pP->enb_flag != 1 ||
      ctxt_pP->module_id != 0 ||
      ctxt_pP->instance != 0 ||
      ctxt_pP->eNB_index != 0 ||
      //ctxt_pP->configured != 2 ||
      //srb2add_list == NULL ||
      //drb2add_list != NULL ||
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      //drb2release_list != NULL ||
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      //security_modeP != 255 ||
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      //kRRCenc != NULL ||
      //kRRCint != NULL ||
      //kUPenc != NULL ||
      pmch_InfoList_r9 != NULL /*||
      defaultDRB != NULL */) {
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    LOG_I(PDCP,"Releasing DRBs, oops\n");
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    TODO;
  }

  if (srb2add_list != NULL) {
    for (i = 0; i < srb2add_list->list.count; i++) {
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      add_srb(ctxt_pP->enb_flag,rnti, srb2add_list->list.array[i]);
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    }
  }

  if (drb2add_list != NULL) {
    for (i = 0; i < drb2add_list->list.count; i++) {
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      add_drb(ctxt_pP->enb_flag, rnti, drb2add_list->list.array[i],
              rlc_bearer2add_list->list.array[i]->rlc_Config,
              security_modeP & 0x0f, (security_modeP >> 4) & 0x0f,
              kUPenc, kUPint);
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    }
  }

  /* update security */
  if (kRRCint != NULL) {
    /* todo */
  }

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  if (drb2release_list != NULL) {
    // TODO
  }
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  free(kRRCenc);
  free(kRRCint);
  free(kUPenc);
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  free(kUPint);
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  return 0;
}

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/* Dummy function due to dependency from LTE libraries */
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boolean_t rrc_pdcp_config_asn1_req(
  const protocol_ctxt_t *const  ctxt_pP,
  LTE_SRB_ToAddModList_t  *const srb2add_list,
  LTE_DRB_ToAddModList_t  *const drb2add_list,
  LTE_DRB_ToReleaseList_t *const drb2release_list,
  const uint8_t                   security_modeP,
  uint8_t                  *const kRRCenc,
  uint8_t                  *const kRRCint,
  uint8_t                  *const kUPenc
#if (LTE_RRC_VERSION >= MAKE_VERSION(9, 0, 0))
  ,LTE_PMCH_InfoList_r9_t  *pmch_InfoList_r9
#endif
  ,rb_id_t                 *const defaultDRB)
{
  return 0;
}

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void nr_DRB_preconfiguration(uint16_t crnti)
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{

  NR_RadioBearerConfig_t             *rbconfig = NULL;
  struct NR_CellGroupConfig__rlc_BearerToAddModList *Rlc_Bearer_ToAdd_list = NULL;
  protocol_ctxt_t ctxt;
  //fill_default_rbconfig(rb_config, 5, 1);
  rbconfig = calloc(1, sizeof(*rbconfig));

  rbconfig->srb_ToAddModList = NULL;
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  rbconfig->srb3_ToRelease = NULL;
  rbconfig->drb_ToAddModList = calloc(1,sizeof(*rbconfig->drb_ToAddModList));
  NR_DRB_ToAddMod_t *drb_ToAddMod = calloc(1,sizeof(*drb_ToAddMod));
  drb_ToAddMod->cnAssociation = calloc(1,sizeof(*drb_ToAddMod->cnAssociation));
  drb_ToAddMod->cnAssociation->present = NR_DRB_ToAddMod__cnAssociation_PR_eps_BearerIdentity;
  drb_ToAddMod->cnAssociation->choice.eps_BearerIdentity= 5;
  drb_ToAddMod->drb_Identity = 1;
  drb_ToAddMod->reestablishPDCP = NULL;
  drb_ToAddMod->recoverPDCP = NULL;
  drb_ToAddMod->pdcp_Config = calloc(1,sizeof(*drb_ToAddMod->pdcp_Config));
  drb_ToAddMod->pdcp_Config->drb = calloc(1,sizeof(*drb_ToAddMod->pdcp_Config->drb));
  drb_ToAddMod->pdcp_Config->drb->discardTimer = calloc(1,sizeof(*drb_ToAddMod->pdcp_Config->drb->discardTimer));
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  *drb_ToAddMod->pdcp_Config->drb->discardTimer=NR_PDCP_Config__drb__discardTimer_infinity;
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  drb_ToAddMod->pdcp_Config->drb->pdcp_SN_SizeUL = calloc(1,sizeof(*drb_ToAddMod->pdcp_Config->drb->pdcp_SN_SizeUL));
  *drb_ToAddMod->pdcp_Config->drb->pdcp_SN_SizeUL = NR_PDCP_Config__drb__pdcp_SN_SizeUL_len12bits;
  drb_ToAddMod->pdcp_Config->drb->pdcp_SN_SizeDL = calloc(1,sizeof(*drb_ToAddMod->pdcp_Config->drb->pdcp_SN_SizeDL));
  *drb_ToAddMod->pdcp_Config->drb->pdcp_SN_SizeDL = NR_PDCP_Config__drb__pdcp_SN_SizeDL_len12bits;
  drb_ToAddMod->pdcp_Config->drb->headerCompression.present = NR_PDCP_Config__drb__headerCompression_PR_notUsed;
  drb_ToAddMod->pdcp_Config->drb->headerCompression.choice.notUsed = 0;

  drb_ToAddMod->pdcp_Config->drb->integrityProtection=NULL;
  drb_ToAddMod->pdcp_Config->drb->statusReportRequired=NULL;
  drb_ToAddMod->pdcp_Config->drb->outOfOrderDelivery=NULL;
  drb_ToAddMod->pdcp_Config->moreThanOneRLC = NULL;

  drb_ToAddMod->pdcp_Config->t_Reordering = calloc(1,sizeof(*drb_ToAddMod->pdcp_Config->t_Reordering));
  *drb_ToAddMod->pdcp_Config->t_Reordering = NR_PDCP_Config__t_Reordering_ms0;
  drb_ToAddMod->pdcp_Config->ext1 = NULL;

  ASN_SEQUENCE_ADD(&rbconfig->drb_ToAddModList->list,drb_ToAddMod);
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