The base relative to which 'offset' is measured. Possible values are:
If specified, apply this mask (bitwise AND) to the field to ignore bits before matching. Encoded as a hexadecimal number (starting with "0x"). The last byte of the field (in network byte order) corresponds to the least significant byte of the mask.
The name of this field. Must be unique within the policy.
Offset of the first byte of the field (in network byte order) relative to 'base'.
Size of the field in bytes. Valid values: 1-4.