Added code to send EPS Bearer Context status IE in TAU Accept message… (

#504)

Summary:
1. Fix for issue #494  - Added code to send EPS Bearer Context status IE in TAU Accept message
2. Verified sanity with S1 SIM
Pull Request resolved: #504

Reviewed By: ssanadhya

Differential Revision: D16602457

Pulled By: talkhasib

fbshipit-source-id: d2776b15d587f89ddc33d0d56facc7d17806cb04

lte/gateway/c/oai/tasks/nas/emm/TrackingAreaUpdate.c

@@ -266,32 +266,6 @@ int emm_proc_tracking_area_update_request(
       bdestroy_wrapper(&ue_mm_context->ue_radio_capability);
     }
   }
-
-  /*
-   * Requirement MME24.301R10_5.5.3.2.4_5a
-   */
-  if (ies->eps_bearer_context_status) {
-    // This IE is not implemented
-    OAILOG_WARNING(
-      LOG_NAS_EMM,
-      "EMM-PROC- Sending Tracking Area Update Reject.EPS Bearer Context Status "
-      "IE not supported. ue_id=" MME_UE_S1AP_ID_FMT ", cause=%d)\n",
-      ue_id,
-      EMM_CAUSE_IE_NOT_IMPLEMENTED);
-    rc = _emm_tracking_area_update_reject(ue_id, EMM_CAUSE_IE_NOT_IMPLEMENTED);
-    increment_counter(
-      "tracking_area_update_req",
-      1,
-      2,
-      "result",
-      "failure",
-      "cause",
-      "eps_bearer_context_status_ie_not_supported");
-    free_emm_tau_request_ies(&ies);
-    unlock_ue_contexts(ue_mm_context);
-    OAILOG_FUNC_RETURN(LOG_NAS_EMM, rc);
-  }
-
   /*
    * Store the mobile station classmark2 information recieved in Tracking Area Update request
    * This wil be required for SMS and SGS service request procedure
@@ -638,8 +612,12 @@ static int _emm_tracking_area_update_accept(nas_emm_tau_proc_t *const tau_proc)
       emm_sap.u.emm_as.u.establish.tai_list.numberoflists = 0;
       emm_sap.u.emm_as.u.establish.nas_info = EMM_AS_NAS_INFO_TAU;
 
+      /*Send eps_bearer_context_status in TAU Accept if received in TAU Req*/
+      if (tau_proc->ies->eps_bearer_context_status) {
+        emm_sap.u.emm_as.u.establish.eps_bearer_context_status =
+          tau_proc->ies->eps_bearer_context_status;
+      }
       // TODO Reminder
-      emm_sap.u.emm_as.u.establish.eps_bearer_context_status = NULL;
       emm_sap.u.emm_as.u.establish.location_area_identification = NULL;
       emm_sap.u.emm_as.u.establish.combined_tau_emm_cause = NULL;
 
@@ -750,6 +728,12 @@ static int _emm_tracking_area_update_accept(nas_emm_tau_proc_t *const tau_proc)
        */
       emm_as->ue_id = tau_proc->ue_id;
 
+      /*Send eps_bearer_context_status in TAU Accept if received in TAU Req*/
+      if (tau_proc->ies->eps_bearer_context_status) {
+        emm_as->eps_bearer_context_status =
+          tau_proc->ies->eps_bearer_context_status;
+      }
+
       /*If CSFB is enabled,store LAI,Mobile Identity and
       * Additional Update type to be sent in TAU accept to S1AP
       */

lte/gateway/c/oai/tasks/nas/emm/sap/emm_asDef.h

@@ -271,6 +271,7 @@ typedef struct emm_as_data_s {
     ms_identity; /* MS identity This IE may be included to assign or unassign a new TMSI to a UE during a combined TA/LA update. */
   uint8_t *additional_update_result; /* TAU Additional update result   */
   uint32_t *emm_cause;               /* EMM failure cause code        */
+  uint16_t *eps_bearer_context_status; /* TAU EPS bearer context status   */
   uint32_t sgs_loc_updt_status;
   uint32_t *sgs_reject_cause;
   uint8_t

lte/gateway/c/oai/tasks/nas/emm/sap/emm_send.c

@@ -1156,6 +1156,12 @@ int emm_send_tracking_area_update_accept_dl_nas(
   size += EPS_UPDATE_RESULT_MAXIMUM_LENGTH;
   emm_msg->epsupdateresult = EPS_UPDATE_RESULT_TA_UPDATED;
 
+  if (msg->eps_bearer_context_status) {
+    emm_msg->presencemask |=
+      TRACKING_AREA_UPDATE_ACCEPT_EPS_BEARER_CONTEXT_STATUS_PRESENT;
+    emm_msg->epsbearercontextstatus = *msg->eps_bearer_context_status;
+    size += EPS_BEARER_CONTEXT_STATUS_MAXIMUM_LENGTH;
+  }
   /* If CSFB is enabled send LAI,Mobile Identity
   *  and Additional Update type
   */