void nl_dump_start(struct nl_dump *, int protocol,
const struct ofpbuf *request);
bool nl_dump_next(struct nl_dump *, struct ofpbuf *reply, struct ofpbuf *buf);
+bool nl_dump_peek(struct ofpbuf *reply, struct ofpbuf *buf);
int nl_dump_done(struct nl_dump *);
/* Miscellaneous */