Add library for NAS Identity Request

* Add Identity Request decoding function
* Define type for Identity Type NAS IE
* Target include directory in NAS IEs CMakeLists.txt (for NAS utils)

openair3/NAS/NR_UE/5GS/5GMM/IES/CMakeLists.txt

@@ -11,3 +11,5 @@ target_link_libraries(fgs_5gmm_ies_lib
 	                PUBLIC nas_common_ies_lib
 			PRIVATE log_headers
 )
+
+target_include_directories(fgs_5gmm_ies_lib PRIVATE ../../)

openair3/NAS/NR_UE/5GS/5GMM/IES/FGSMobileIdentity.h

@@ -30,8 +30,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
-
 #include "OctetString.h"
+#include "fgs_nas_utils.h"
 
 #ifndef FGS_MOBILE_IDENTITY_H_
 #define FGS_MOBILE_IDENTITY_H_
@@ -129,15 +129,22 @@ typedef struct {
   uint8_t macaddr;
 } Macaddr5GSMobileIdentity_t;
 
+#define FOREACH_IDENTITY_TYPE(TYPE_DEF)       \
+  TYPE_DEF(FGS_MOBILE_IDENTITY_NOIDENTITY, 0) \
+  TYPE_DEF(FGS_MOBILE_IDENTITY_SUCI, 1)       \
+  TYPE_DEF(FGS_MOBILE_IDENTITY_5G_GUTI, 2)    \
+  TYPE_DEF(FGS_MOBILE_IDENTITY_IMEI, 3)       \
+  TYPE_DEF(FGS_MOBILE_IDENTITY_5GS_TMSI, 4)   \
+  TYPE_DEF(FGS_MOBILE_IDENTITY_IMEISV, 5)     \
+  TYPE_DEF(FGS_MOBILE_IDENTITY_MAC_ADDR, 6)   \
+  TYPE_DEF(FGS_MOBILE_IDENTITY_EUI64, 7)
+
+typedef enum { FOREACH_IDENTITY_TYPE(TO_ENUM) } fgs_identity_type_t;
+
+static const text_info_t fgs_identity_type_text[] = {FOREACH_IDENTITY_TYPE(TO_TEXT)};
+
 // clang-format off
 typedef union FGSMobileIdentity_tag {
-#define FGS_MOBILE_IDENTITY_NOIDENTITY    0b000
-#define FGS_MOBILE_IDENTITY_SUCI          0b001
-#define FGS_MOBILE_IDENTITY_5G_GUTI       0b010
-#define FGS_MOBILE_IDENTITY_IMEI          0b011
-#define FGS_MOBILE_IDENTITY_5GS_TMSI      0b100
-#define FGS_MOBILE_IDENTITY_IMEISV        0b101
-#define FGS_MOBILE_IDENTITY_MAC_ADDR      0b110
   NoIdentity5GSMobileIdentity_t   noidentity;
   Suci5GSMobileIdentity_t         suci;
   Guti5GSMobileIdentity_t         guti;

openair3/NAS/NR_UE/5GS/5GMM/MSG/CMakeLists.txt

@@ -5,6 +5,7 @@ add_library(fgs_5gmm_lib OBJECT
     fgmm_service_reject.c
     RegistrationRequest.c
     RegistrationAccept.c
+    fgmm_identity_request.c
     FGSIdentityResponse.c
     FGSAuthenticationResponse.c
     FGSNASSecurityModeComplete.c

openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_identity_request.c

@@ -0,0 +1,37 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * 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.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#include "fgmm_identity_request.h"
+#include <string.h>
+#include "FGSMobileIdentity.h"
+
+int decode_fgs_identity_request(fgs_identity_request_msg_t *msg, const byte_array_t *buffer)
+{
+  if (buffer->len < 1) {
+    PRINT_NAS_ERROR("Failed to decode NAS Identity Request: invalid buffer length %ld\n", buffer->len);
+    return -1;
+  }
+
+  // Bits 3-1 (least significant 3 bits)
+  msg->fgsmobileidentity = buffer->buf[0] & 0x07;
+
+  return 1;
+}

openair3/NAS/NR_UE/5GS/5GMM/MSG/fgmm_identity_request.h

@@ -0,0 +1,36 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * 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.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#ifndef FGS_IDENTITY_REQUEST_H
+#define FGS_IDENTITY_REQUEST_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "common/utils/ds/byte_array.h"
+#include "FGSMobileIdentity.h"
+
+typedef struct {
+  fgs_identity_type_t fgsmobileidentity;
+} fgs_identity_request_msg_t;
+
+int decode_fgs_identity_request(fgs_identity_request_msg_t *msg, const byte_array_t *buffer);
+
+#endif /* FGS_IDENTITY_REQUEST_H */