void ofconn_set_protocol(struct ofconn *, enum ofputil_protocol);
enum nx_packet_in_format ofconn_get_packet_in_format(struct ofconn *);
void ofconn_set_protocol(struct ofconn *, enum ofputil_protocol);
enum nx_packet_in_format ofconn_get_packet_in_format(struct ofconn *);