2 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.


SMS over GSUP: implement forwarding of MT SMS

When an SMSC tries to deliver an SM to a subscriber, it will send us
an MT-forwardSM.req GSUP message.  We look up the subscriber by IMSI
and see if they are attached to a VLR.  If the subscriber is attached,
we forward the message to the MSC/VLR, otherwise return an error
to the SMSC.

Related: OS#6135
Change-Id: Ib3551bf7839690606c677461758c5cfef5f0aa7b
---
M include/osmocom/hlr/hlr_sms.h
M src/hlr.c
M src/hlr_sms.c
3 files changed, 48 insertions(+), 0 deletions(-)

diff --git a/include/osmocom/hlr/hlr_sms.h b/include/osmocom/hlr/hlr_sms.h
index 727e408..e6e476e 100644
--- a/include/osmocom/hlr/hlr_sms.h
+++ b/include/osmocom/hlr/hlr_sms.h
@@ -29,3 +29,4 @@
 void smsc_route_free(struct hlr_smsc_route *rt);
 
 void forward_mo_sms(struct osmo_gsup_req *req);
+void forward_mt_sms(struct osmo_gsup_req *req);
diff --git a/src/hlr.c b/src/hlr.c
index 501eabc..eae9e84 100644
--- a/src/hlr.c
+++ b/src/hlr.c
@@ -560,6 +560,9 @@
 	case OSMO_GSUP_MSGT_MO_FORWARD_SM_REQUEST:
 		forward_mo_sms(req);
 		break;
+	case OSMO_GSUP_MSGT_MT_FORWARD_SM_REQUEST:
+		forward_mt_sms(req);
+		break;
 	default:
 		LOGP(DMAIN, LOGL_DEBUG, "Unhandled GSUP message type %s\n",
 		     osmo_gsup_message_type_name(req->gsup.message_type));
diff --git a/src/hlr_sms.c b/src/hlr_sms.c
index 672d6c9..c8c8e49 100644
--- a/src/hlr_sms.c
+++ b/src/hlr_sms.c
@@ -190,3 +190,31 @@
 			     strlen(smsc->name) + 1);
 	osmo_gsup_forward_to_local_peer(req->cb_data, &dest_peer, req, NULL);
 }
+
+/***********************************************************************
+ * forwarding of MT SMS from SMSCs to MSC/VLR based on IMSI
+ ***********************************************************************/
+
+void forward_mt_sms(struct osmo_gsup_req *req)
+{
+	struct hlr_subscriber subscr;
+	struct osmo_cni_peer_id dest_peer;
+	int rc;
+
+	rc = db_subscr_get_by_imsi(g_hlr->dbc, req->gsup.imsi, &subscr);
+	if (rc < 0) {
+		osmo_gsup_req_respond_err(req, GMM_CAUSE_IMSI_UNKNOWN,
+					  "IMSI unknown");
+		return;
+	}
+	/* is this subscriber currently attached to a VLR? */
+	if (!subscr.vlr_number[0]) {
+		osmo_gsup_req_respond_err(req, GMM_CAUSE_IMPL_DETACHED,
+					  "subscriber not attached to a VLR");
+		return;
+	}
+	osmo_cni_peer_id_set(&dest_peer, OSMO_CNI_PEER_ID_IPA_NAME,
+			     (const uint8_t *) subscr.vlr_number,
+			     strlen(subscr.vlr_number) + 1);
+	osmo_gsup_forward_to_local_peer(req->cb_data, &dest_peer, req, NULL);
+}

