NSA: some work on security (for PDCP)

- compute correct kgNB
- propagate properly NR security capabilities of an UE
  (involves: rrc, s1ap, x2ap)

openair2/COMMON/s1ap_messages_types.h

@@ -155,6 +155,11 @@ typedef struct security_capabilities_s {
   uint16_t integrity_algorithms;
 } security_capabilities_t;
 
+typedef struct nr_security_capabilities_s {
+  uint16_t encryption_algorithms;
+  uint16_t integrity_algorithms;
+} nr_security_capabilities_t;
+
 /* Provides the establishment cause for the RRC connection request as provided
  * by the upper layers. W.r.t. the cause value names: highPriorityAccess
  * concerns AC11..AC15, ‘mt’ stands for ‘Mobile Terminating’ and ‘mo’ for
@@ -538,6 +543,9 @@ typedef struct s1ap_initial_context_setup_req_s {
   uint8_t  nb_of_e_rabs;
   /* list of e_rab to be setup by RRC layers */
   e_rab_t  e_rab_param[S1AP_MAX_E_RAB];
+
+  /* NR Security algorithms (if any, set to 0 if not present) */
+  nr_security_capabilities_t nr_security_capabilities;
 } s1ap_initial_context_setup_req_t;
 
 typedef struct tai_plmn_identity_s {

openair2/COMMON/x2ap_messages_types.h

@@ -338,7 +338,7 @@ typedef struct x2ap_ENDC_sgnb_addition_req_s {
   /* used for RRC->X2AP in source eNB */
   int rnti;
 
-  security_capabilities_t security_capabilities;
+  nr_security_capabilities_t security_capabilities;
 
   /* SgNB Security Key */
   uint8_t      kgnb[32];