r.mask
r.mask.rast - Creates a MASK for limiting raster operation.
Raster (r.*)
ParameterRaster|raster|Name of raster map to use as mask|False
ParameterRaster|input|Name of raster map to which apply the mask|False
ParameterString|maskcats|Raster values to use for mask. Format: 1 2 3 thru 7 *|*|False|True
*ParameterBoolean|-i|Create inverse mask|False|True
OutputRaster|output|Masked