added replayed GRPS security capabilities. Moto G4 sends security mode complete.

srsepc/epc.conf.example

@@ -19,7 +19,7 @@ mme_group = 0x0001
 tac = 0x0001
 mcc = 001
 mnc = 01
-mme_bind_addr = 127.0.0.0/24
+mme_bind_addr = 127.0.1.100
 
 #####################################################################
 # HSS configuration
@@ -40,5 +40,5 @@ db_file = user_db.csv
 #####################################################################
 
 [spgw]
-gtpu_bind_addr=127.0.0.2
+gtpu_bind_addr=127.0.1.100
 sgi_if_addr=172.0.0.1

srsepc/hdr/mme/s1ap_common.h

@@ -92,6 +92,8 @@ typedef struct{
   eps_security_ctx_t security_ctxt;
   erab_ctx_t erabs_ctx[MAX_ERABS_PER_UE];
   LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT ue_network_cap;
+  bool ms_network_cap_present;
+  LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT ms_network_cap;
 } ue_ctx_t;
 }//namespace
 #endif

srsepc/src/mme/s1ap.cc

@@ -369,16 +369,18 @@ s1ap::handle_initial_ue_message(LIBLTE_S1AP_MESSAGE_INITIALUEMESSAGE_STRUCT *ini
   m_s1ap_log->console("Attach request from IMSI: %015lu\n", imsi);
   m_s1ap_log->info("Attach request from IMSI: %015lu\n", imsi);  
 
-  //Get UE security capabilities
+  //Get UE network capabilities
   memcpy(&ue_ctx.ue_network_cap, &attach_req.ue_network_cap, sizeof(LIBLTE_MME_UE_NETWORK_CAPABILITY_STRUCT));
-
+  ue_ctx.ms_network_cap_present =  attach_req.ms_network_cap_present;
+  if(attach_req.ms_network_cap_present)
+  {
+    memcpy(&ue_ctx.ms_network_cap, &attach_req.ms_network_cap, sizeof(LIBLTE_MME_MS_NETWORK_CAPABILITY_STRUCT));
+  }
   //FIXME use this info
   uint8_t eps_bearer_id = pdn_con_req.eps_bearer_id;             //TODO: Unused
   uint8_t proc_transaction_id = pdn_con_req.proc_transaction_id; //TODO: Transaction ID unused
   m_s1ap_log->console("EPS Bearer id: %d\n", eps_bearer_id);
 
-
-
   //Add eNB info to UE ctxt
   memcpy(&ue_ctx.enb_sri, enb_sri, sizeof(struct sctp_sndrcvinfo));
 

srsepc/src/mme/s1ap_nas_transport.cc

@@ -266,7 +266,7 @@ s1ap_nas_transport::pack_security_mode_command(srslte::byte_buffer_t *reply_msg,
   sm_cmd.selected_nas_sec_algs.type_of_eia = LIBLTE_MME_TYPE_OF_INTEGRITY_ALGORITHM_128_EIA1;
 
   sm_cmd.nas_ksi.tsc_flag=LIBLTE_MME_TYPE_OF_SECURITY_CONTEXT_FLAG_NATIVE;
-  sm_cmd.nas_ksi.nas_ksi=6; //111 no key available
+  sm_cmd.nas_ksi.nas_ksi=0; 
 
   //Replay UE security cap
   memcpy(sm_cmd.ue_security_cap.eea,ue_ctx->ue_network_cap.eea,8*sizeof(bool));
@@ -275,8 +275,8 @@ s1ap_nas_transport::pack_security_mode_command(srslte::byte_buffer_t *reply_msg,
   memcpy(sm_cmd.ue_security_cap.uea,ue_ctx->ue_network_cap.uea,8*sizeof(bool));
   sm_cmd.ue_security_cap.uia_present = ue_ctx->ue_network_cap.uia_present;
   memcpy(sm_cmd.ue_security_cap.uia,ue_ctx->ue_network_cap.uia,8*sizeof(bool));
-  sm_cmd.ue_security_cap.gea_present = false;
+  sm_cmd.ue_security_cap.gea_present = ue_ctx->ms_network_cap_present;
-  //memcpy(sm_cmd.ue_security_cap.gea,ue_ctx->ue_network_cap.gea,8*sizeof(bool));
+  memcpy(sm_cmd.ue_security_cap.gea,ue_ctx->ms_network_cap.gea,8*sizeof(bool));
   /*
     typedef struct{
     bool eea[8];