-/* Given the wildcard bit count in bits 'shift' through 'shift + 5' (inclusive)
- * of 'wildcards', returns a 32-bit bit mask with a 1 in each bit that must
- * match and a 0 in each bit that is wildcarded.
- *
- * The bits in 'wildcards' are in the format used in enum ofp_flow_wildcards: 0
- * is exact match, 1 ignores the LSB, 2 ignores the 2 least-significant bits,
- * ..., 32 and higher wildcard the entire field. This is the *opposite* of the
- * usual convention where e.g. /24 indicates that 8 bits (not 24 bits) are
- * wildcarded.
- *
- * 'wildcards' is in host byte order. The return value is in network byte
- * order. */
-static inline uint32_t
-flow_nw_bits_to_mask(uint32_t wildcards, int shift)
-{
- wildcards = (wildcards >> shift) & 0x3f;
- return wildcards < 32 ? htonl(~((1u << wildcards) - 1)) : 0;
-}
+ovs_be32 flow_nw_bits_to_mask(uint32_t wildcards, int shift);
+void flow_wildcards_init(struct flow_wildcards *, uint32_t wildcards);
+void flow_wildcards_init_exact(struct flow_wildcards *);