u32 error_drop_node_index;
u32 esp_encrypt_node_index;
u32 esp_decrypt_node_index;
u32 error_drop_node_index;
u32 esp_encrypt_node_index;
u32 esp_decrypt_node_index;
extern vlib_node_registration_t ipsec_if_output_node;
extern vlib_node_registration_t ipsec_if_input_node;
extern vlib_node_registration_t ipsec_if_output_node;
extern vlib_node_registration_t ipsec_if_input_node;