adding tmp emm storage for when the UE uses an unknown guti and id request has to be sent.

srsepc/hdr/mme/s1ap.h

@@ -91,6 +91,9 @@ public:
   bool delete_ue_ecm_ctx(uint32_t mme_ue_s1ap_id);
   void delete_ues_ecm_ctx_in_enb(uint16_t enb_id);
 
+  void store_tmp_ue_emm_ctx(const ue_emm_ctx_t &ue_ecm_ctx);
+  bool get_tmp_ue_emm_ctx(uint32_t mme_ue_s1ap_id, ue_emm_ctx_t* ue_emm_ptr);
+
   uint32_t allocate_m_tmsi(uint32_t mme_ue_s1ap_id);
 
   s1ap_args_t                    m_s1ap_args;
@@ -119,6 +122,7 @@ private:
 
   std::map<uint64_t, ue_emm_ctx_t*>                 m_imsi_to_ue_emm_ctx;
   std::map<uint32_t, ue_ecm_ctx_t*>                 m_mme_ue_s1ap_id_to_ue_ecm_ctx;
+  std::map<int32_t,ue_emm_ctx_t*>                   m_mme_ue_s1ap_id_to_tmp_ue_emm_ctx;
 
   uint32_t                                          m_next_mme_ue_s1ap_id;
   uint32_t                                          m_next_m_tmsi;

srsepc/src/mme/s1ap.cc

@@ -346,6 +346,31 @@ s1ap::add_new_ue_emm_ctx(const ue_emm_ctx_t &ue_emm_ctx)
   m_imsi_to_ue_emm_ctx.insert(std::pair<uint64_t,ue_emm_ctx_t*>(ue_ptr->imsi,ue_ptr));
 }
 
+void
+s1ap::store_tmp_ue_emm_ctx(const ue_emm_ctx_t &tmp_ue_emm_ctx)
+{
+  ue_emm_ctx_t *ue_ptr = new ue_emm_ctx_t;
+  memcpy(ue_ptr,&tmp_ue_emm_ctx,sizeof(tmp_ue_emm_ctx));
+
+  //This map will store UE's ECM context.
+  m_mme_ue_s1ap_id_to_tmp_ue_emm_ctx.insert(std::pair<uint32_t,ue_emm_ctx_t*>(ue_ptr->mme_ue_s1ap_id,ue_ptr));
+}
+
+bool
+s1ap::get_tmp_ue_emm_ctx(uint32_t mme_ue_s1ap_id, ue_emm_ctx_t* ue_emm_ptr)
+{
+
+  std::map<int32_t,ue_emm_ctx_t*>::iterator it = m_mme_ue_s1ap_id_to_tmp_ue_emm_ctx.find(mme_ue_s1ap_id);
+  if(it == m_mme_ue_s1ap_id_to_tmp_ue_emm_ctx.end() )
+  {
+    return false;
+  }
+  memcpy(ue_emm_ptr, it->second,sizeof(ue_emm_ctx_t));
+  delete it->second;
+  m_mme_ue_s1ap_id_to_tmp_ue_emm_ctx.erase(it);
+  return true;
+}
+
 void
 s1ap::add_new_ue_ecm_ctx(const ue_ecm_ctx_t &ue_ecm_ctx)
 {

srsepc/src/mme/s1ap_nas_transport.cc

@@ -385,31 +385,24 @@ s1ap_nas_transport::handle_nas_guti_attach_request(uint32_t enb_ue_s1ap_id,
     m_s1ap_log->info("Attach request -- IMSI: %015lu\n", ue_ecm_ctx.imsi);
     m_s1ap_log->console("Attach request -- eNB-UE S1AP Id: %d, MME-UE S1AP Id: %d\n", ue_ecm_ctx.enb_ue_s1ap_id, ue_ecm_ctx.mme_ue_s1ap_id);
     m_s1ap_log->console("Attach Request -- UE Network Capabilities EEA: %d%d%d%d%d%d%d%d\n",
-                      attach_req.ue_network_cap.eea[0],
-                      attach_req.ue_network_cap.eea[1],
-                      attach_req.ue_network_cap.eea[2],
-                      attach_req.ue_network_cap.eea[3],
-                      attach_req.ue_network_cap.eea[4],
-                      attach_req.ue_network_cap.eea[5],
-                      attach_req.ue_network_cap.eea[6],
-                      attach_req.ue_network_cap.eea[7]);
+                      attach_req.ue_network_cap.eea[0], attach_req.ue_network_cap.eea[1], attach_req.ue_network_cap.eea[2], attach_req.ue_network_cap.eea[3],
+                      attach_req.ue_network_cap.eea[4], attach_req.ue_network_cap.eea[5], attach_req.ue_network_cap.eea[6], attach_req.ue_network_cap.eea[7]);
     m_s1ap_log->console("Attach Request -- UE Network Capabilities EIA: %d%d%d%d%d%d%d%d\n",
-                      attach_req.ue_network_cap.eia[0],
-                      attach_req.ue_network_cap.eia[1],
-                      attach_req.ue_network_cap.eia[2],
-                      attach_req.ue_network_cap.eia[3],
-                      attach_req.ue_network_cap.eia[4],
-                      attach_req.ue_network_cap.eia[5],
-                      attach_req.ue_network_cap.eia[6],
-                      attach_req.ue_network_cap.eia[7]);
+                      attach_req.ue_network_cap.eia[0], attach_req.ue_network_cap.eia[1], attach_req.ue_network_cap.eia[2], attach_req.ue_network_cap.eia[3],
+                      attach_req.ue_network_cap.eia[4], attach_req.ue_network_cap.eia[5], attach_req.ue_network_cap.eia[6], attach_req.ue_network_cap.eia[7]);
     m_s1ap_log->console("Attach Request -- MS Network Capabilities Present: %s\n", attach_req.ms_network_cap_present ? "true" : "false");
     m_s1ap_log->console("PDN Connectivity Request -- EPS Bearer Identity requested: %d\n", pdn_con_req.eps_bearer_id);
     m_s1ap_log->console("PDN Connectivity Request -- Procedure Transaction Id: %d\n", pdn_con_req.proc_transaction_id);
     m_s1ap_log->console("PDN Connectivity Request -- ESM Information Transfer requested: %s\n", pdn_con_req.esm_info_transfer_flag_present ? "true" : "false");
 
     m_s1ap_log->console("Could not find M-TMSI=0x%x. Sending ID request\n",m_tmsi);
-    m_s1ap_log->info("Could not find M-TMSI=0x%d. Sending Id Request\n", m_tmsi);
+    m_s1ap_log->info("Could not find M-TMSI=0x%x. Sending Id Request\n", m_tmsi);
     m_s1ap->add_new_ue_ecm_ctx(ue_ecm_ctx);
+
+    //We do not know the IMSI of the UE yet
+    //This will be removed when the Identity request is received
+    m_s1ap->store_tmp_ue_emm_ctx(tmp_ue_emm_ctx);
+
     pack_identity_request(reply_buffer, ue_ecm_ctx.enb_ue_s1ap_id, ue_ecm_ctx.mme_ue_s1ap_id);
     *reply_flag = true;
     return true;