X2HO: ITTI X2AP_HANDOVER_REQ X2AP->RRC on target eNB now contains keNB* and...

X2HO: ITTI X2AP_HANDOVER_REQ X2AP->RRC on target eNB now contains keNB* and NCC, stored in RRC UE context on target eNB

openair2/COMMON/x2ap_messages_types.h

@@ -116,6 +116,8 @@ typedef struct x2ap_handover_req_s {
   int source_rnti;                       /* TODO: to be fixed/remove */
   int source_x2id;                       /* TODO: to be fixed/remove */
   PhysCellId_t target_physCellId;
+  uint8_t      kenb[32]; // keNB or keNB*
+  long int     next_hop_chaining_count;
   /* TODO: this parameter has to be removed */
   int target_mod_id;
 } x2ap_handover_req_t;

openair2/RRC/LITE/defs.h

@@ -387,6 +387,7 @@ typedef struct eNB_RRC_UE_s {
 #if defined(ENABLE_SECURITY)
   /* KeNB as derived from KASME received from EPC */
   uint8_t kenb[32];
+  int8_t  kenb_ncc;
   uint8_t nh[32];
   int8_t  nh_ncc;
 #endif

openair2/RRC/LITE/rrc_eNB.c

@@ -2600,7 +2600,12 @@ global_rnti = rnti;
   /* TODO: remove this hack */
   ue_context_target_p->ue_context.handover_info->modid_t = mod_id;
   ue_context_target_p->ue_context.handover_info->modid_s = 1-mod_id;
-  ue_context_target_p->ue_context.handover_info->ueid_s= m->source_rnti;
+  ue_context_target_p->ue_context.handover_info->ueid_s  = m->source_rnti;
+
+  memset (ue_context_target_p->ue_context.nh, 0, 32);
+  ue_context_target_p->ue_context.nh_ncc = -1;
+  memcpy (ue_context_target_p->ue_context.kenb, m->kenb, 32);
+  ue_context_target_p->ue_context.kenb_ncc = m->next_hop_chaining_count;
 }
 
 #if 0

openair2/X2AP/x2ap_eNB_handler.c

@@ -234,8 +234,15 @@ x2ap_eNB_handle_handover_preparation(uint32_t assoc_id,
   extern int x2id_to_source_rnti[1];
   X2AP_HANDOVER_REQ(m).source_x2id = x2HandoverRequest->old_eNB_UE_X2AP_ID;
   X2AP_HANDOVER_REQ(m).source_rnti = x2id_to_source_rnti[x2HandoverRequest->old_eNB_UE_X2AP_ID];
-  itti_send_msg_to_task(TASK_RRC_ENB, x2ap_eNB_data->x2ap_eNB_instance->instance, m);
-  return 0;
+  if ((x2HandoverRequest->uE_ContextInformation.aS_SecurityInformation.key_eNodeB_star.buf) &&
+	  (x2HandoverRequest->uE_ContextInformation.aS_SecurityInformation.key_eNodeB_star.size == 256)) {
+    memcpy(X2AP_HANDOVER_REQ(m).kenb, x2HandoverRequest->uE_ContextInformation.aS_SecurityInformation.key_eNodeB_star.buf, 32);
+    X2AP_HANDOVER_REQ(m).next_hop_chaining_count = x2HandoverRequest->uE_ContextInformation.aS_SecurityInformation.nextHopChainingCount;
+    itti_send_msg_to_task(TASK_RRC_ENB, x2ap_eNB_data->x2ap_eNB_instance->instance, m);
+    return 0;
+  } else {
+	return -1;
+  }
 
 #if 0
   if (x2SetupRequest->globalENB_ID.eNB_ID.present == X2ap_ENB_ID_PR_home_eNB_ID) {