integrate NAS into the code

src/nas/3gpp_24.501.h

@@ -100,7 +100,7 @@ extern "C" {
 #define PDU_SESSION_RELEASE_COMMAND             0b11010011
 #define PDU_SESSION_RELEASE_COMPLETE            0b11010100
 
-#define _5GSM_STATUS                             0b11010110
+#define _5GSM_STATUS                            0b11010110
 
 
 

src/nas/nas_message.c

@@ -1022,7 +1022,6 @@ static int _nas_message_plain_decode (
      * Decode 5G Session Management L3 message
      */
     bytes = sm_msg_decode (&msg->sm, (uint8_t *) buffer, length);
-    printf("\ndukl esm_msg_decode\n");
   } else {
     /*
      * Discard L3 messages with not supported protocol discriminator

src/pgwc/pgw_app.hpp

@@ -41,6 +41,11 @@
 #include "pistache/router.h"
 #include "smf_msg.hpp"
 
+extern "C"{
+#include "nas_message.h"
+#include "mmData.h"
+}
+
 #include <map>
 #include <set>
 #include <shared_mutex>
@@ -177,6 +182,45 @@ public:
    */
   void send_create_session_response(Pistache::Http::ResponseWriter& httpResponse, oai::smf::model::SmContextCreateError& smContextCreateError, Pistache::Http::Code code);
 
+  /*
+   * Create N1 SM Container to send to AMF (using NAS lib)
+   * @param [std::shared_ptr<itti_n11_create_sm_context_response>] sm_context_res
+   * @param [uint8_t] msg_type Type of N1 message
+   * @param [std::string&] nas_msg_str store NAS message in form of string
+   *
+   */
+  void create_n1_sm_container(std::shared_ptr<itti_n11_create_sm_context_response> sm_context_res, uint8_t msg_type, std::string& nas_msg_str, uint8_t sm_cause = 0);
+
+  //for testing purpose!!
+  void create_n1_sm_container(uint8_t msg_type, std::string& nas_msg_str, uint8_t sm_cause = 0);
+
+
+  /*
+    * Create N1 SM Container to send to AMF (using NAS lib)
+    * @param [std::shared_ptr<itti_n11_create_sm_context_request>] sm_context_req
+    * @param [uint8_t] msg_type Type of N1 message
+    * @param [std::string&] nas_msg_str store NAS message in form of string
+    *
+    */
+   void create_n1_sm_container(std::shared_ptr<itti_n11_create_sm_context_request> sm_context_req, uint8_t msg_type, std::string& nas_msg_str,  uint8_t sm_cause = 0);
+
+  /*
+    * Create N2 SM Information to send to AMF (using NAS lib)
+    * @param [std::shared_ptr<itti_n11_create_sm_context_response>] sm_context_res
+    * @param [uint8_t] msg_type Type of N2 message
+    * @param [std::string&] ngap_msg_str store NGAP message in form of string
+    *
+    */
+   void create_n2_sm_information(std::shared_ptr<itti_n11_create_sm_context_response> sm_context_res, uint8_t ngap_msg_type, uint8_t ngap_ie_type, std::string& ngap_msg_str);
+
+   /*
+     * Decode N1 SM Container into the NAS mesasge (using NAS lib)
+     * @param [nas_message_t&] nas_msg Store NAS message after decoded
+     * @param [std::string&] n1_sm_msg N1 SM Container from AMF
+     * @return status of the decode process
+     */
+   uint8_t decode_nas_message_n1_sm_container(nas_message_t& nas_msg, std::string& n1_sm_msg);
+
 };
 }
 #include "smf_config.hpp"

src/pgwc/pgw_context.cpp

@@ -399,6 +399,7 @@ void pgw_context::handle_amf_msg (std::shared_ptr<itti_n11_create_sm_context_req
 	itti_n11_create_sm_context_response *sm_context_resp = new itti_n11_create_sm_context_response(TASK_PGWC_APP, TASK_SMF_N11, smreq->http_response);
 	std::shared_ptr<itti_n11_create_sm_context_response> sm_context_resp_pending = std::shared_ptr<itti_n11_create_sm_context_response>(sm_context_resp);
 	sm_context_resp->res.set_supi(supi);
+	sm_context_resp->res.set_cause(REQUEST_ACCEPTED);
 
 	//Step 3. find pdn_connection
 	std::shared_ptr<dnn_context> sd;
@@ -543,14 +544,13 @@ void pgw_context::handle_amf_msg (std::shared_ptr<itti_n11_create_sm_context_req
 			//}
 		}
 
-		//Send reply to AMF
+		//Send reply to AMF (PDUSession_CreateSMContextResponse including Cause, SMContextId)
 		//location header contains the URI of the created resource
 		Logger::pgwc_app().info("Sending response to AMF!");
 		nlohmann::json jsonData;
 		oai::smf::model::SmContextCreatedData smContextCreatedData;
 		//include only SmfServiceInstanceId (See section 6.1.6.2.3, 3GPP TS 29.502 v16.0.0)
 
-
 		to_json(jsonData, smContextCreatedData);
 		std::string resBody = jsonData.dump();
 		sm_context_resp->http_response.send(Pistache::Http::Code::Created, resBody);
@@ -566,12 +566,54 @@ void pgw_context::handle_amf_msg (std::shared_ptr<itti_n11_create_sm_context_req
 		}
 
 	}else{ //if request is rejected
-        //TODO:
+		//TODO:
 		//un-subscribe to the modifications of Session Management Subscription data for (SUPI, DNN, S-NSSAI)
 	}
 
-	//step 9. send ITTI message to SMF N11 for the pending session?
-    //TODO:
+	//step 9. if error when establishing the pdu session, send ITTI message to APP to trigger N1N2MessageTransfer towards AMFs
+	if (sm_context_resp->res.get_cause() != REQUEST_ACCEPTED) {
+		//clear pco, ambr
+        //TODO:
+		//free paa
+		paa_t free_paa = {};
+		free_paa = sm_context_resp->res.get_paa();
+		if (free_paa.is_ip_assigned()){
+			switch (sp->pdn_type.pdn_type) {
+			case PDN_TYPE_E_IPV4:
+			case PDN_TYPE_E_IPV4V6:
+				paa_dynamic::get_instance().release_paa (sd->dnn_in_use, free_paa.ipv4_address);
+				break;
+
+			case PDN_TYPE_E_IPV6:
+			case PDN_TYPE_E_NON_IP:
+			default:;
+			}
+			//sm_context_resp->res.clear_paa(); //TODO:
+		}
+		//clear the created context??
+		//TODO:
+
+/*
+		for (auto it : sm_context_resp->res.bearer_contexts_to_be_created) {
+			gtpv2c::bearer_context_created_within_create_session_response bcc = {};
+			cause_t bcc_cause = {.cause_value = NO_RESOURCES_AVAILABLE, .pce = 0, .bce = 0, .cs = 0};
+			bcc.set(it.eps_bearer_id);
+			bcc.set(bcc_cause);
+			//sm_context_resp->res.add_bearer_context_created(bcc);
+		}
+*/
+		//send ITTI message to N11 interface to trigger N1N2MessageTransfer towards AMFs
+		//with N1SM container with a PDU Session Establishment Reject message
+		//TODO
+		//sm_context_resp_pending->res.set
+		Logger::pgwc_app().info( "Sending ITTI message %s to task TASK_SMF_N11", sm_context_resp_pending->get_msg_name());
+
+		int ret = itti_inst->send_msg(sm_context_resp_pending);
+		if (RETURNok != ret) {
+			Logger::pgwc_app().error( "Could not send ITTI message %s to task TASK_SMF_N11",  sm_context_resp_pending->get_msg_name());
+		}
+
+	}
 
 
 }

src/pgwc/smf_msg.hpp

@@ -159,7 +159,6 @@ class pdu_session_create_sm_context_response {
 public:
 	pdu_session_create_sm_context_response(){ }
 
-
 	supi_t get_supi() const;
 	void set_supi(supi_t const& value);
 	pdu_session_id_t get_pdu_session_id() const;
@@ -176,7 +175,6 @@ private:
 	pdu_session_id_t m_pdu_session_id;
 	uint8_t m_cause;
 	paa_t m_paa;
-	//Pistache::Http::ResponseWriter m_http_response;
 	Pistache::Http::Code m_code;
 };
 

src/pgwc/smf_n11.cpp

@@ -31,6 +31,7 @@
 #include "itti.hpp"
 #include "logger.hpp"
 #include "smf_n11.hpp"
+#include "pgw_app.hpp"
 #include <curl/curl.h>
 #include <nlohmann/json.hpp>
 
@@ -39,6 +40,7 @@
 #define AMF_CURL_TIMEOUT_MS 100L
 #define AMF_NUMBER_RETRIES 3
 #define HTTP_STATUS_OK 200
+#define DEBUG 1
 
 using namespace pgwc;
 using namespace std;
@@ -46,6 +48,7 @@ using json = nlohmann::json;
 
 extern itti_mw *itti_inst;
 extern smf_n11   *smf_n11_inst;
+extern pgwc::pgw_app *pgw_app_inst;
 void smf_n11_task (void*);
 
 /*
@@ -119,6 +122,8 @@ void smf_n11::send_msg_to_amf(std::shared_ptr<itti_n11_create_sm_context_respons
 	//use curl to send data for the moment
 
 	nlohmann::json jsonData;
+	std::string n1_message;
+
 	curl_global_init(CURL_GLOBAL_DEFAULT);
 	struct curl_slist *headers = NULL;
 	headers = curl_slist_append(headers, "Accept: application/json");
@@ -132,9 +137,19 @@ void smf_n11::send_msg_to_amf(std::shared_ptr<itti_n11_create_sm_context_respons
 	std::string url = amf_addr + ":" + std::to_string(amf_port) + "/namf-comm/v1/ue-contexts/" + std::to_string(supi64) +"/n1-n2-messages";
 	Logger::smf_n11().debug("[get_sm_data] UDM's URL: %s ", url.c_str());
 
-	//TODO: fill the content of N1N2MessageTransferReqData
+	//N1 SM container
+	if (sm_context_res->res.get_cause() != REQUEST_ACCEPTED) { //PDU Session Establishment Reject
+    	pgw_app_inst->create_n1_sm_container(sm_context_res, PDU_SESSION_ESTABLISHMENT_REJECT, n1_message); //need cause?
+	} else { //PDU Session Establishment Accept
+		pgw_app_inst->create_n1_sm_container(sm_context_res, PDU_SESSION_ESTABLISHMENT_REJECT, n1_message); //need cause?
+    	//pgw_app_inst->create_n1_sm_container(sm_context_res, PDU_SESSION_ESTABLISHMENT_ACCPET, n1_message); //need cause?
+	}
+
 	jsonData["n1MessageContainer"]["n1MessageClass"] = "SM";
-	jsonData["n1MessageContainer"]["n1MessageContent"]["contentId"] = "n1MessageContent";
+	jsonData["n1MessageContainer"]["n1MessageContent"]["contentId"] = n1_message.c_str();
+	Logger::smf_n11().debug("n1MessageContent: %s\n ", n1_message.c_str());
+
+	//TODO: fill the content of N1N2MessageTransferReqData
 	//jsonData["n2InfoContainer"]["n2InformationClass"] = "SM";
 	//jsonData["n2InfoContainer"]["smInfo"]["PduSessionId"] = 123;
 	//jsonData["n2InfoContainer"]["smInfo"]["n2InfoContent"]["ngapMessageType"] = 123; //NGAP message
@@ -187,7 +202,7 @@ void smf_n11::send_msg_to_amf(std::shared_ptr<itti_n11_create_sm_context_respons
 		}
 		curl_easy_cleanup(curl);
 	}
-	//TODO: process the response if neccessary
+	//TODO: process the response if necessary
 
 }
 

src/pgwc/smf_procedure.cpp

@@ -287,7 +287,7 @@ void session_create_sm_context_procedure::handle_itti_msg (itti_n4_session_estab
 	//address, interface identifier, Session-AMBR, selected PDU Session Type, Reflective QoS Timer (if available),
 	//P-CSCF address(es), [Always-on PDU Session])))
 
-    //send ITTI message to APP to trigger N1N2MessageTransfer towards AMFs
+    //send ITTI message to N11 interface to trigger N1N2MessageTransfer towards AMFs
 	Logger::pgwc_app().info( "Sending ITTI message %s to task TASK_SMF_N11", n11_triggered_pending->get_msg_name());
 
 	int ret = itti_inst->send_msg(n11_triggered_pending);

src/test/inputs/apitest.json

@@ -38,7 +38,8 @@
 	"n2SmInfo": {"contentId":"n2SmInfo"},
 	"n1SmMsg": {"contentId":"n1SmMsg"}
  }, 
-	"binaryDataN1SmMessage":"00 00 00 00 00 00 00 00 00 00 00 00 08 00 45 02 00 55 00 01 40 00 40 84 3c 25 7f 00 00 01 7f 00 00 01 df b0 96 0c ea 4c f5 4b 00 00 00 00 00 03 00 35 20 bc ec 86 00 00 00 00 00 00 00 00 00 0f 40 21 00 00 01 00 26 00 1a 19 2e 03 1f c1 00 ff 93 a2 39 0f 61 62 63 64 65 66 40 67 68 69 6a 6b 2e 6c 6d"
+        "binaryDataN1SmMessage":"2e031fc100ff93a2390f616263646566406768696a6b2e6c6d",
+	"binaryDataN1SmMessage_full":"00 00 00 00 00 00 00 00 00 00 00 00 08 00 45 02 00 55 00 01 40 00 40 84 3c 25 7f 00 00 01 7f 00 00 01 df b0 96 0c ea 4c f5 4b 00 00 00 00 00 03 00 35 20 bc ec 86 00 00 00 00 00 00 00 00 00 0f 40 21 00 00 01 00 26 00 1a 19 2e 03 1f c1 00 ff 93 a2 39 0f 61 62 63 64 65 66 40 67 68 69 6a 6b 2e 6c 6d"
 }