void ofpbuf_reinit(struct ofpbuf *, size_t);
struct ofpbuf *ofpbuf_new(size_t);
+struct ofpbuf *ofpbuf_new_with_headroom(size_t, size_t headroom);
struct ofpbuf *ofpbuf_clone(const struct ofpbuf *);
+struct ofpbuf *ofpbuf_clone_with_headroom(const struct ofpbuf *,
+ size_t headroom);
struct ofpbuf *ofpbuf_clone_data(const void *, size_t);
void ofpbuf_delete(struct ofpbuf *);