const char *ofputil_version_to_string(enum ofp_version ofp_version);
uint32_t ofputil_versions_from_string(const char *s);
+bool ofputil_decode_hello(const struct ofp_header *,
+ uint32_t *allowed_versions);
+struct ofpbuf *ofputil_encode_hello(uint32_t version_bitmap);
+
struct ofpbuf *ofputil_encode_set_protocol(enum ofputil_protocol current,
enum ofputil_protocol want,
enum ofputil_protocol *next);