+/**
+ * Adds arc from lisp-gpe-input to nsh-input if nsh-input is available
+ */
+static void
+gpe_add_arc_from_input_to_nsh ()
+{
+ lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main ();
+ vlib_main_t *vm = lgm->vlib_main;
+ vlib_node_t *nsh_input;
+
+ /* Arc already exists */
+ if (next_proto_to_next_index[LISP_GPE_NEXT_PROTO_NSH]
+ != LISP_GPE_INPUT_NEXT_DROP)
+ return;
+
+ /* Check if nsh-input is available */
+ if ((nsh_input = vlib_get_node_by_name (vm, (u8 *) "nsh-input")))
+ {
+ u32 slot4, slot6;
+ slot4 = vlib_node_add_next_with_slot (vm, lisp_gpe_ip4_input_node.index,
+ nsh_input->index,
+ LISP_GPE_NEXT_PROTO_NSH);
+ slot6 = vlib_node_add_next_with_slot (vm, lisp_gpe_ip6_input_node.index,
+ nsh_input->index,
+ LISP_GPE_NEXT_PROTO_NSH);
+ ASSERT (slot4 == slot6 && slot4 == LISP_GPE_INPUT_NEXT_NSH_INPUT);
+
+ next_proto_to_next_index[LISP_GPE_NEXT_PROTO_NSH] = slot4;
+ }
+}
+
+/** GPE decap init function. */
+clib_error_t *
+gpe_decap_init (vlib_main_t * vm)
+{
+ clib_error_t *error = 0;
+
+ if ((error = vlib_call_init_function (vm, lisp_gpe_init)))
+ return error;
+
+ gpe_add_arc_from_input_to_nsh ();
+ return 0;
+}
+
+static uword
+lisp_gpe_nsh_dummy_input (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ vlib_node_increment_counter (vm, node->node_index, 0, 1);
+ return from_frame->n_vectors;
+}
+
+static char *lisp_gpe_nsh_dummy_error_strings[] = {
+ "lisp gpe dummy nsh decap",
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (lisp_gpe_nsh_dummy_input_node) = {
+ .function = lisp_gpe_nsh_dummy_input,
+ .name = "lisp-gpe-nsh-dummy-input",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_next_nodes = 1,
+
+ .n_errors = 1,
+ .error_strings = lisp_gpe_nsh_dummy_error_strings,
+
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+lisp_add_dummy_nsh_node_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main ();
+ vlib_node_add_next (lgm->vlib_main, lisp_gpe_ip4_input_node.index,
+ lisp_gpe_nsh_dummy_input_node.index);
+ next_proto_to_next_index[LISP_GPE_NEXT_PROTO_NSH] =
+ LISP_GPE_INPUT_NEXT_NSH_INPUT;
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (lisp_add_dummy_nsh_node_command, static) = {
+ .path = "test one nsh add-dummy-decap-node",
+ .function = lisp_add_dummy_nsh_node_command_fn,
+};
+/* *INDENT-ON* */
+
+VLIB_INIT_FUNCTION (gpe_decap_init);
+