Support Deactivate PDP Context Request from network

Enable Deactivate PDP context based on the IMSI of the subscriber.
When there are PDP contexts present for a MM context,
PDP context will be deactivated along with GMM Detach(MM context deletion).
If there are no PDP present, MM context will be deleted to avoid
further PDP context request from the MS.
Test cases is added to check this functionality.

Change-Id: Ia0a41aa2218ec2fda4ea17a37c8cc55cba63dd13

1 files changed, 38 insertions, 0 deletions

diff --git a/openbsc/src/gprs/gprs_sgsn.c b/openbsc/src/gprs/gprs_sgsn.c
index e5a54d9b4..8558029a1 100644
--- a/openbsc/src/gprs/gprs_sgsn.c
+++ b/openbsc/src/gprs/gprs_sgsn.c
@@ -667,6 +667,44 @@ static void drop_one_pdp(struct sgsn_pdp_ctx *pdp)
 	}
 }
 
+/*
+ * High-level function to be called for PDP deactivation initiated from SGSN VTY.
+ * When there are PDP contexts present for a MM context, PDP context will be
+ * deactivated along with GMM Detach(MM context deletion).
+ * If there are no PDP present, MM context will be deleted to avoid further
+ * PDP context activation for that MS.
+ */
+void drop_gmm_ctx_for_ms(const char *imsi)
+{
+	OSMO_ASSERT(imsi != NULL);
+	struct sgsn_mm_ctx *mm;
+	struct sgsn_pdp_ctx *pdp;
+
+	/* Search the MM context subscriber */
+	mm = sgsn_mm_ctx_by_imsi(imsi);
+	LOGMMCTXP(LOGL_INFO, mm,
+		"SGSN intiated Deactivate PDP request for %s\n", imsi);
+	if (mm) {
+		/* Search the PDP for this subscriber */
+		if (llist_empty(&mm->pdp_list)) {
+			/*
+			 * Deleting mm context for the subscriber when no PDP
+			 * context is present.
+			 */
+			gsm0408_gprs_access_cancelled(mm, GMM_CAUSE_GPRS_NOTALLOWED);
+			LOGMMCTXP(LOGL_NOTICE, mm, "No PDP context to deactivate\n");
+		} else {
+			llist_for_each_entry(pdp, &mm->pdp_list, list) {
+				gsm48_tx_gsm_deact_pdp_req(pdp, GSM_CAUSE_DEACT_REGULAR);
+				LOGPDPCTXP(LOGL_INFO, pdp, "PDP Deactivation "
+					"Successful\n");
+			}
+		}
+	} else
+		LOGMMCTXP(LOGL_NOTICE, mm,
+			"No MM context to deactivate for %s\n", imsi);
+}
+
 /* High-level function to be called in case a GGSN has disappeared or
  * otherwise lost state (recovery procedure) */
 int drop_all_pdp_for_ggsn(struct sgsn_ggsn_ctx *ggsn)