Add Paging Reject

src/mme/sgsap-build.c

@@ -188,6 +188,36 @@ ogs_pkbuf_t *sgsap_build_mo_csfb_indication(mme_ue_t *mme_ue)
     return pkbuf;
 }
 
+ogs_pkbuf_t *sgsap_build_paging_reject(mme_ue_t *mme_ue)
+{
+    mme_vlr_t *vlr = NULL;
+    ogs_tlv_t *root = NULL;
+    ogs_pkbuf_t *pkbuf = NULL;
+
+    nas_emm_cause_t emm_cause = 0;
+
+    ogs_assert(mme_ue);
+    vlr = mme_ue->vlr;
+    ogs_assert(vlr);
+
+    root = ogs_tlv_add(NULL, SGSAP_IE_IMSI_TYPE, SGSAP_IE_IMSI_LEN, 0,
+            &mme_ue->nas_mobile_identity_imsi);
+    emm_cause = EMM_CAUSE_ILLEGAL_UE;
+    ogs_tlv_add(root, SGSAP_IE_REJECT_CAUSE_TYPE, SGSAP_IE_REJECT_CAUSE_LEN, 0,
+            &emm_cause);
+
+    pkbuf = ogs_pkbuf_alloc(NULL, MAX_SDU_LEN);
+    ogs_pkbuf_put_u8(pkbuf, SGSAP_PAGING_REJECT);
+    ogs_pkbuf_put(pkbuf, MAX_SDU_LEN-1);
+
+    ogs_pkbuf_trim(pkbuf, 1+ogs_tlv_render(root,
+            pkbuf->data+1, MAX_SDU_LEN-1, OGS_TLV_MODE_T1_L1));
+
+    ogs_tlv_free_all(root);
+
+    return pkbuf;
+}
+
 ogs_pkbuf_t *sgsap_build_service_request(mme_ue_t *mme_ue, uint8_t emm_mode)
 {
     mme_vlr_t *vlr = NULL;

src/mme/sgsap-build.h

@@ -30,6 +30,7 @@ ogs_pkbuf_t *sgsap_build_location_update_request(mme_ue_t *mme_ue);
 ogs_pkbuf_t *sgsap_build_tmsi_reallocation_complete(mme_ue_t *mme_ue);
 ogs_pkbuf_t *sgsap_build_detach_indication(mme_ue_t *mme_ue);
 ogs_pkbuf_t *sgsap_build_mo_csfb_indication(mme_ue_t *mme_ue);
+ogs_pkbuf_t *sgsap_build_paging_reject(mme_ue_t *mme_ue);
 ogs_pkbuf_t *sgsap_build_service_request(mme_ue_t *mme_ue, uint8_t emm_mode);
 ogs_pkbuf_t *sgsap_build_reset_ack(mme_vlr_t *vlr);
 

src/mme/sgsap-handler.c

@@ -303,24 +303,26 @@ void sgsap_handle_paging_request(mme_vlr_t *vlr, ogs_pkbuf_t *pkbuf)
     } else 
         ogs_assert_if_reached();
 
-    ogs_assert(mme_ue);
+    if (mme_ue) {
+        ogs_assert(service_indicator);
+        mme_ue->service_indicator = service_indicator;
 
-    ogs_assert(service_indicator);
-    mme_ue->service_indicator = service_indicator;
+        ogs_debug("    IMSI[%s]", mme_ue->imsi_bcd);
+        ogs_debug("    VLR_NAME[%s]", vlr_name);
+        ogs_debug("    SERVICE_INDICATOR[%d]", mme_ue->service_indicator);
 
-    ogs_debug("    IMSI[%s]", mme_ue->imsi_bcd);
-    ogs_debug("    VLR_NAME[%s]", vlr_name);
-    ogs_debug("    SERVICE_INDICATOR[%d]", mme_ue->service_indicator);
+        if (lai) {
+            ogs_debug("    LAI[PLMN_ID:%06x,LAC:%d]",
+                        plmn_id_hexdump(&lai->nas_plmn_id), lai->lac);
+        }
 
-    if (lai) {
-        ogs_debug("    LAI[PLMN_ID:%06x,LAC:%d]",
-                    plmn_id_hexdump(&lai->nas_plmn_id), lai->lac);
+        if (ECM_IDLE(mme_ue))
+            s1ap_send_paging(mme_ue, S1AP_CNDomain_cs);
+        else
+            nas_send_cs_service_notification(mme_ue);
+    } else {
+        sgsap_send_paging_reject(mme_ue);
     }
-
-    if (ECM_IDLE(mme_ue))
-        s1ap_send_paging(mme_ue, S1AP_CNDomain_cs);
-    else
-        nas_send_cs_service_notification(mme_ue);
 }
 
 void sgsap_handle_reset_indication(mme_vlr_t *vlr, ogs_pkbuf_t *pkbuf)

src/mme/sgsap-path.c

@@ -178,6 +178,22 @@ int sgsap_send_mo_csfb_indication(mme_ue_t *mme_ue)
     return OGS_OK;
 }
 
+int sgsap_send_paging_reject(mme_ue_t *mme_ue)
+{
+    int rv;
+    ogs_pkbuf_t *pkbuf = NULL;
+    ogs_assert(mme_ue);
+
+    ogs_debug("[SGSAP] PAGING-REJECT");
+    ogs_debug("    IMSI[%s]", mme_ue->imsi_bcd);
+
+    pkbuf = sgsap_build_paging_reject(mme_ue);
+    rv = sgsap_send_to_vlr(mme_ue, pkbuf);
+    ogs_assert(rv == OGS_OK);
+
+    return OGS_OK;
+}
+
 int sgsap_send_service_request(mme_ue_t *mme_ue, uint8_t emm_mode)
 {
     int rv;

src/mme/sgsap-path.h

@@ -46,6 +46,7 @@ int sgsap_send_location_update_request(mme_ue_t *mme_ue);
 int sgsap_send_tmsi_reallocation_complete(mme_ue_t *mme_ue);
 int sgsap_send_detach_indication(mme_ue_t *mme_ue);
 int sgsap_send_mo_csfb_indication(mme_ue_t *mme_ue);
+int sgsap_send_paging_reject(mme_ue_t *mme_ue);
 int sgsap_send_service_request(mme_ue_t *mme_ue, uint8_t emm_mode);
 int sgsap_send_reset_ack(mme_vlr_t *vlr);
 

src/mme/sgsap-types.h

@@ -25,6 +25,7 @@ extern "C" {
 #endif
 
 #define SGSAP_PAGING_REQUEST                            1
+#define SGSAP_PAGING_REJECT                             2
 #define SGSAP_SERVICE_REQUEST                           6
 #define SGSAP_LOCATION_UPDATE_REQUEST                   9
 #define SGSAP_LOCATION_UPDATE_ACCEPT                    10