cu_cp: handle optional nas pdu in pdu session resource setup routine

Author: FabianEckermann

include/srsran/cu_cp/cu_cp_types.h

@@ -297,6 +297,7 @@ struct cu_cp_pdu_session_resource_setup_request {
   slotted_id_vector<pdu_session_id_t, cu_cp_pdu_session_res_setup_item> pdu_session_res_setup_items;
   uint64_t                                                              ue_aggregate_maximum_bit_rate_dl;
   plmn_identity                                                         serving_plmn = plmn_identity::test_value();
+  byte_buffer                                                           nas_pdu; ///< optional NAS PDU
 };
 
 enum class cu_cp_qos_flow_map_ind { ul = 0, dl };

lib/cu_cp/routines/pdu_session_resource_setup_routine.cpp

@@ -194,6 +194,10 @@ void pdu_session_resource_setup_routine::operator()(
     {
       // get NAS PDUs as received by AMF
       std::vector<byte_buffer> nas_pdus;
+      if (!setup_msg.nas_pdu.empty()) {
+        nas_pdus.push_back(setup_msg.nas_pdu);
+      }
+
       for (const auto& pdu_session : setup_msg.pdu_session_res_setup_items) {
         if (!pdu_session.pdu_session_nas_pdu.empty()) {
           nas_pdus.push_back(pdu_session.pdu_session_nas_pdu);