diff --git a/include/osmocom/netif/osmux.h b/include/osmocom/netif/osmux.h
index e02c5cd..f7a5fd5 100644
--- a/include/osmocom/netif/osmux.h
+++ b/include/osmocom/netif/osmux.h
@@ -110,6 +110,7 @@ int osmux_xfrm_input_set_batch_factor(struct osmux_in_handle *h, uint8_t batch_f
 void osmux_xfrm_input_set_batch_size(struct osmux_in_handle *h, uint16_t batch_size);
 void osmux_xfrm_input_set_initial_seqnum(struct osmux_in_handle *h, uint8_t osmux_seqnum);
 void osmux_xfrm_input_set_deliver_cb(struct osmux_in_handle *h, void (*deliver_cb)(struct msgb *msg, void *data), void *data);
+void *osmux_xfrm_input_get_deliver_cb_data(struct osmux_in_handle *h);
 
 int osmux_xfrm_input_open_circuit(struct osmux_in_handle *h, int ccid, int dummy);
 void osmux_xfrm_input_close_circuit(struct osmux_in_handle *h, int ccid);
diff --git a/src/osmux_input.c b/src/osmux_input.c
index f177ea9..2c18b20 100644
--- a/src/osmux_input.c
+++ b/src/osmux_input.c
@@ -686,6 +686,11 @@ void osmux_xfrm_input_set_deliver_cb(struct osmux_in_handle *h,
 	h->data = data;
 }
 
+void *osmux_xfrm_input_get_deliver_cb_data(struct osmux_in_handle *h)
+{
+	return h->data;
+}
+
 int osmux_xfrm_input_open_circuit(struct osmux_in_handle *h, int ccid,
 				  int dummy)
 {