def subtract_network(
container_network: ipaddress.IPv4Network,
contained_network: ipaddress.IPv4Network
) -> List[ipaddress.IPv4Network]:
if contained_network.subnet_of(container_network):
return list(container_network.address_exclude(contained_network))
return []
def large_absorb_small(
aggregated_supernet: Tuple[List[IPv4Network], IPv4Network],
net: IPv4Network) -> Tuple[List[IPv4Network], IPv4Network]:
aggregated, supernet = aggregated_supernet
if not net.subnet_of(supernet): # type: ignore
aggregated.append(net)
supernet = net
return aggregated, supernet
def remove_subnet(subnets: List[IPv4Network],
exclude: IPv4Network) -> List[IPv4Network]:
result = []
# Find which subnet the exclusion is part of
for sub in subnets:
# If found, exclude & add the result
if exclude.subnet_of(sub):
result.extend(list(sub.address_exclude(exclude)))
else:
# Other subnets can be added directly
result.append(sub)
# Collapse in case of overlaps
new_result = list(collapse_addresses(result))
new_result.sort()
return new_result
