struct ofpbuf *ofpbuf_clone_with_headroom(const struct ofpbuf *,
size_t headroom);
struct ofpbuf *ofpbuf_clone_data(const void *, size_t);
+struct ofpbuf *ofpbuf_clone_data_with_headroom(const void *, size_t,
+ size_t headroom);
void ofpbuf_delete(struct ofpbuf *);
void *ofpbuf_at(const struct ofpbuf *, size_t offset, size_t size);