Read Home PLMN from IMSI

lib/include/srslte/interfaces/ue_interfaces.h

@@ -54,6 +54,7 @@ class usim_interface_nas
 public:
   virtual void get_imsi_vec(uint8_t* imsi_, uint32_t n) = 0;
   virtual void get_imei_vec(uint8_t* imei_, uint32_t n) = 0;
+  virtual int  get_home_plmn_id(LIBLTE_RRC_PLMN_IDENTITY_STRUCT *home_plmn_id) = 0;
   virtual void generate_authentication_response(uint8_t  *rand,
                                                 uint8_t  *autn_enb,
                                                 uint16_t  mcc,

srsue/hdr/upper/nas.h

@@ -95,7 +95,6 @@ public:
 
   // UE interface
   void attach_request();
-
   void deattach_request();
 
 private:

srsue/hdr/upper/usim.h

@@ -61,6 +61,7 @@ public:
   // NAS interface
   void get_imsi_vec(uint8_t* imsi_, uint32_t n);
   void get_imei_vec(uint8_t* imei_, uint32_t n);
+  int  get_home_plmn_id(LIBLTE_RRC_PLMN_IDENTITY_STRUCT *home_plmn_id);
 
   void generate_authentication_response(uint8_t  *rand,
                                         uint8_t  *autn_enb,
@@ -119,6 +120,8 @@ private:
   uint8_t     k_asme[32];
   uint8_t     k_enb[32];
 
+  bool initiated;
+
 };
 
 } // namespace srsue

srsue/src/ue.cc

@@ -181,11 +181,10 @@ bool ue::init(all_args_t *args_)
   rlc.init(&pdcp, &rrc, this, &rlc_log, &mac, 0 /* RB_ID_SRB0 */);
   pdcp.init(&rlc, &rrc, &gw, &pdcp_log, 0 /* RB_ID_SRB0 */, SECURITY_DIRECTION_UPLINK);
 
+  usim.init(&args->usim, &usim_log);
   nas.init(&usim, &rrc, &gw, &nas_log, 1 /* RB_ID_SRB1 */);
   gw.init(&pdcp, &nas, &gw_log, 3 /* RB_ID_DRB1 */);
 
-  usim.init(&args->usim, &usim_log);
-
   rrc.init(&phy, &mac, &rlc, &pdcp, &nas, &usim, &mac, &rrc_log);
   rrc.set_ue_category(atoi(args->expert.ue_cateogry.c_str()));
 

srsue/src/upper/nas.cc

@@ -50,8 +50,12 @@ void nas::init(usim_interface_nas *usim_,
   nas_log = nas_log_;
   state = EMM_STATE_DEREGISTERED;
   plmn_selection = PLMN_NOT_SELECTED;
-  home_plmn.mcc = 61441; // This is 001
-  home_plmn.mnc = 65281; // This is 01
+
+  if (usim->get_home_plmn_id(&home_plmn)) {
+    nas_log->error("Getting Home PLMN Id from USIM. Defaulting to 001-01\n");
+    home_plmn.mcc = 61441; // This is 001
+    home_plmn.mnc = 65281; // This is 01
+  }
   cfg     = cfg_;
 }
 
@@ -64,6 +68,7 @@ emm_state_t nas::get_state() {
 /*******************************************************************************
 UE interface
 *******************************************************************************/
+
 void nas::attach_request() {
   nas_log->info("Attach Request\n");
   if (state == EMM_STATE_DEREGISTERED) {
@@ -137,7 +142,7 @@ void nas::plmn_search_end() {
 
     rrc->plmn_select(known_plmns[0]);
   } else {
-    nas_log->info("Finished searching PLMN in current EARFCN set but no networks were found.\n");
+    nas_log->debug("Finished searching PLMN in current EARFCN set but no networks were found.\n");
   }
 }
 

srsue/src/upper/rrc.cc

@@ -458,7 +458,7 @@ void rrc::cell_found(uint32_t earfcn, srslte_cell_t phy_cell, float rsrp) {
 
 // PHY indicates that has gone through all known EARFCN
 void rrc::earfcn_end() {
-  rrc_log->info("Finished searching cells in EARFCN set while in state %s\n", rrc_state_text[state]);
+  rrc_log->debug("Finished searching cells in EARFCN set while in state %s\n", rrc_state_text[state]);
 
   // If searching for PLMN, indicate NAS we scanned all frequencies
   if (state == RRC_STATE_PLMN_SELECTION) {

srsue/src/upper/usim.cc

@@ -25,13 +25,15 @@
  */
 
 
+#include <sstream>
 #include "upper/usim.h"
+#include "srslte/common/bcd_helpers.h"
 
 using namespace srslte;
 
 namespace srsue{
 
-usim::usim()
+usim::usim() : initiated(false)
 {}
 
 void usim::init(usim_args_t *args, srslte::log *usim_log_)
@@ -91,6 +93,7 @@ void usim::init(usim_args_t *args, srslte::log *usim_log_)
   if("xor" == args->algo) {
     auth_algo = auth_algo_xor;
   }
+  initiated = true;
 }
 
 void usim::stop()
@@ -102,6 +105,11 @@ void usim::stop()
 
 void usim::get_imsi_vec(uint8_t* imsi_, uint32_t n)
 {
+  if (!initiated)
+  {
+    usim_log->error("Getting IMSI: USIM not initiated\n");
+    return;
+  }
   if(NULL == imsi_ || n < 15)
   {
     usim_log->error("Invalid parameters to get_imsi_vec");
@@ -111,13 +119,18 @@ void usim::get_imsi_vec(uint8_t* imsi_, uint32_t n)
   uint64_t temp = imsi;
   for(int i=14;i>=0;i--)
   {
-      imsi_[i] = temp % 10;
-      temp /= 10;
+    imsi_[i] = temp % 10;
+    temp /= 10;
   }
 }
 
 void usim::get_imei_vec(uint8_t* imei_, uint32_t n)
 {
+  if (!initiated)
+  {
+    usim_log->error("Getting IMEI: USIM not initiated\n");
+    return;
+  }
   if(NULL == imei_ || n < 15)
   {
     usim_log->error("Invalid parameters to get_imei_vec");
@@ -127,9 +140,46 @@ void usim::get_imei_vec(uint8_t* imei_, uint32_t n)
   uint64 temp = imei;
   for(int i=14;i>=0;i--)
   {
-      imei_[i] = temp % 10;
-      temp /= 10;
+    imei_[i] = temp % 10;
+    temp /= 10;
+  }
+}
+
+int usim::get_home_plmn_id(LIBLTE_RRC_PLMN_IDENTITY_STRUCT *home_plmn_id)
+{
+  if (!initiated)
+  {
+    usim_log->error("Getting Home PLMN Id: USIM not initiated\n");
+    return -1;
   }
+
+  uint32_t mcc_len = 3;
+  uint32_t mnc_len = 2;
+
+  uint8_t imsi_vec[15];
+  get_imsi_vec(imsi_vec, 15);
+
+  std::ostringstream mcc_str, mnc_str;
+
+  for (int i=0;i<mcc_len;i++) {
+    mcc_str << (int) imsi_vec[i];
+  }
+
+  // US MCC uses 3 MNC digits
+  if (!mcc_str.str().compare("310")) {
+    mnc_len = 3;
+  }
+  for (int i=mcc_len;i<mcc_len+mnc_len;i++) {
+    mnc_str << (int) imsi_vec[i];
+  }
+
+  string_to_mcc(mcc_str.str(), &home_plmn_id->mcc);
+  string_to_mnc(mnc_str.str(), &home_plmn_id->mnc);
+
+  usim_log->info("Read Home PLMN Id=%s\n",
+                 plmn_id_to_string(*home_plmn_id).c_str());
+
+  return 0;
 }
 
 void usim::generate_authentication_response(uint8_t  *rand,