void flow_extract(struct ofpbuf *, uint32_t priority, uint32_t mark,
const struct flow_tnl *, uint16_t in_port, struct flow *);
-void flow_extract_l3_onwards(struct ofpbuf *, struct flow *,
- ovs_be16 dl_type);
/* Returns the innermost dl_type.
* If there's an outer and an inner type then the inner type is returned.