Add F1AP UE context setup request message enc/dec + test

Reintroduce separate message types to simplify the encoding/decoding,
including shorter names.  The old types will be removed once everything
has been migrated to the new encoder/decoder, which should ensure that
everything is properly migrated to the unit-tested encoder/decoders.

Also, for each type of F1 message (F1 UE context setup request,
response, modification request, ...) introduce a separate type to avoid
to mistakenly use wrong fields, which can lead to bugs. In this regard,
the DL PDCP SN bit size in the DRB-ToBeSetup list of the UE context
setup request is optional, as it will also be used in the UE context
modification request DRB SetupMod list (which avoids quite some code
duplication). The encoder checks that this IE is present, though.

openair2/COMMON/f1ap_messages_types.h

@@ -26,6 +26,7 @@
 #include <netinet/sctp.h>
 #include "common/5g_platform_types.h"
 #include "common/platform_constants.h"
+#include "common/utils/ds/byte_array.h"
 
 //-------------------------------------------------------------------------------------------//
 // Defines to access message fields.
@@ -452,6 +453,13 @@ typedef struct cu_to_du_rrc_information_s {
   uint32_t handoverPreparationInfo_length;
 }cu_to_du_rrc_information_t;
 
+typedef struct f1ap_cu_to_du_rrc_info_s {
+  byte_array_t *cg_configinfo;
+  byte_array_t *ue_cap;
+  byte_array_t *meas_config;
+  byte_array_t *ho_prep_info;
+} f1ap_cu_to_du_rrc_info_t;
+
 typedef struct du_to_cu_rrc_information_s {
   uint8_t * cellGroupConfig;
   uint32_t  cellGroupConfig_length;
@@ -477,6 +485,97 @@ typedef enum TransmActionInd_e {
   TransmActionInd_RESTART,
 } TransmActionInd_t;
 
+typedef struct f1ap_srb_to_setup_t {
+  int id;
+} f1ap_srb_to_setup_t;
+
+/// 9.3.1.52 Packet Error Rate
+typedef struct f1ap_per_t {
+  uint8_t scalar;
+  uint8_t exponent;
+} f1ap_per_t;
+
+// 9.3.1.49 Non-Dynamic 5QI Descriptor
+typedef struct f1ap_nondynamic_5qi_t {
+  int fiveQI;
+} f1ap_nondynamic_5qi_t;
+
+// 9.3.1.47 Dynamic 5QI Descriptor
+typedef struct f1ap_dynamic_5qi_t {
+  int prio; /// QoS Priority Level
+  int pdb; /// Packet Delay Budget
+  f1ap_per_t per; /// Packet Error Rate
+  bool *delay_critical; /// Delay Critical
+  int *avg_win; /// Averaging Window
+} f1ap_dynamic_5qi_t;
+
+typedef struct f1ap_arp_t {
+  uint16_t prio;
+  preemption_capability_t preempt_cap;
+  preemption_vulnerability_t preempt_vuln;
+} f1ap_arp_t;
+
+// 9.3.1.45 QoS Flow Level QoS Parameters
+typedef struct f1ap_qos_flow_param_t {
+  fiveQI_t qos_type;
+  union {
+    f1ap_nondynamic_5qi_t nondyn;
+    f1ap_dynamic_5qi_t dyn;
+  };
+  f1ap_arp_t arp;
+} f1ap_qos_flow_param_t;
+
+// in 9.2.2.1 Flows Mapped to DRB Item
+typedef struct f1ap_drb_flows_mapped_t {
+  int qfi;
+  f1ap_qos_flow_param_t param;
+} f1ap_drb_flows_mapped_t;
+
+/// in 9.2.2.1 DRB Info in UE Context Setup Request
+typedef struct f1ap_drb_info_nr_t {
+  f1ap_qos_flow_param_t drb_qos;
+  nssai_t nssai;
+  int flows_len;
+  f1ap_drb_flows_mapped_t *flows;
+} f1ap_drb_info_nr_t;
+
+typedef enum { F1AP_PDCP_SN_12B, F1AP_PDCP_SN_18B } f1ap_pdcp_sn_len_t;
+/// in 9.2.2.1 DRB to Be Setup Item IEs
+typedef struct f1ap_drb_to_setup_t {
+  int id;
+  enum { F1AP_QOS_CHOICE_EUTRAN, F1AP_QOS_CHOICE_NR } qos_choice;
+  union {
+    // eutran not implemented
+    f1ap_drb_info_nr_t nr;
+  };
+  int up_ul_tnl_len;
+  f1ap_up_tnl_t up_ul_tnl[2];
+  f1ap_rlc_mode_t rlc_mode;
+  f1ap_pdcp_sn_len_t *dl_pdcp_sn_len; // in setup mandatory, in setupmod optional
+  f1ap_pdcp_sn_len_t *ul_pdcp_sn_len;
+} f1ap_drb_to_setup_t;
+
+typedef struct f1ap_ue_context_setup_req_s {
+  uint32_t gNB_CU_ue_id;
+  uint32_t *gNB_DU_ue_id;
+
+  plmn_id_t plmn;
+  uint64_t nr_cellid;
+  uint8_t servCellIndex;
+
+  f1ap_cu_to_du_rrc_info_t cu_to_du_rrc_info;
+
+  int srbs_len;
+  f1ap_srb_to_setup_t *srbs;
+
+  int drbs_len;
+  f1ap_drb_to_setup_t *drbs;
+
+  byte_array_t *rrc_container;
+
+  uint64_t *gnb_du_ue_agg_mbr_ul; // C-ifDRBSetup
+} f1ap_ue_context_setup_req_t;
+
 typedef struct f1ap_ue_context_setup_s {
   uint32_t gNB_CU_ue_id;
   uint32_t gNB_DU_ue_id;