• Cedric Roux's avatar
    NSA: first draft of nea2 security for gNB · 10e021e9
    Cedric Roux authored
    The code is forced to use nea2, no matter what the UE supports.
    
    After 2^18 PDCP packets, it will fail to work (we don't use HFN yet).
    
    These limitations will be fixed in later commits.
    
    The existing security function was not reused, because it does too
    much memory allocation and initializes the security context at each
    ciphering. So here comes nr_pdcp_security_nea2_cipher(). And also
    the ciphering is done inplace. To be changed if necessary.
    10e021e9
nr_pdcp_entity.h 3.53 KB
/*
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 * 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.
 *-------------------------------------------------------------------------------
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 *      contact@openairinterface.org
 */

#include <stdint.h>

#ifndef _NR_PDCP_ENTITY_H_
#define _NR_PDCP_ENTITY_H_

typedef struct nr_pdcp_entity_t {
  /* functions provided by the PDCP module */
  void (*recv_pdu)(struct nr_pdcp_entity_t *entity, char *buffer, int size);
  void (*recv_sdu)(struct nr_pdcp_entity_t *entity, char *buffer, int size,
                   int sdu_id);
  void (*delete)(struct nr_pdcp_entity_t *entity);
  void (*set_integrity_key)(struct nr_pdcp_entity_t *entity, char *key);

  /* callbacks provided to the PDCP module */
  void (*deliver_sdu)(void *deliver_sdu_data, struct nr_pdcp_entity_t *entity,
                      char *buf, int size);
  void *deliver_sdu_data;
  void (*deliver_pdu)(void *deliver_pdu_data, struct nr_pdcp_entity_t *entity,
                      char *buf, int size, int sdu_id);
  void *deliver_pdu_data;
  int tx_hfn;
  int next_nr_pdcp_tx_sn;
  int maximum_nr_pdcp_sn;

  /* security */
  int has_ciphering;
  int has_integrity;
  int ciphering_algorithm;
  int integrity_algorithm;
  unsigned char ciphering_key[16];
  unsigned char integrity_key[16];
  void *security_context;
  void (*cipher)(void *security_context,
                 unsigned char *buffer, int length,
                 int bearer, int count, int direction);
  void (*free_security)(void *security_context);
  /* security algorithms need to know uplink/downlink information
   * which is reverse for gnb and ue, so we need to know if this
   * pdcp entity is for a gnb or an ue
   */
  int is_gnb;
} nr_pdcp_entity_t;

nr_pdcp_entity_t *new_nr_pdcp_entity_srb(
    int is_gnb, int rb_id,
    void (*deliver_sdu)(void *deliver_sdu_data, struct nr_pdcp_entity_t *entity,
                        char *buf, int size),
    void *deliver_sdu_data,
    void (*deliver_pdu)(void *deliver_pdu_data, struct nr_pdcp_entity_t *entity,
                        char *buf, int size, int sdu_id),
    void *deliver_pdu_data);

nr_pdcp_entity_t *new_nr_pdcp_entity_drb_am(
    int is_gnb, int rb_id,
    void (*deliver_sdu)(void *deliver_sdu_data, struct nr_pdcp_entity_t *entity,
                        char *buf, int size),
    void *deliver_sdu_data,
    void (*deliver_pdu)(void *deliver_pdu_data, struct nr_pdcp_entity_t *entity,
                        char *buf, int size, int sdu_id),
    void *deliver_pdu_data,
    int sn_size,
    int t_reordering,
    int discard_timer,
    int ciphering_algorithm,
    int integrity_algorithm,
    unsigned char *ciphering_key,
    unsigned char *integrity_key);

void nr_DRB_preconfiguration(uint16_t crnti);

#endif /* _NR_PDCP_ENTITY_H_ */