// SetBitsOutsideRange sets all IPs outside range as used
func SetBitsOutsideRange(ipAllocMap *bitset.BitSet, ipRange string, subnetLen uint) {
var i uint32
rangeMin, _ := ipv4ToUint32(getFirstAddrInRange(ipRange))
rangeMax, _ := ipv4ToUint32(getLastAddrInRange(ipRange, subnetLen))
firstAddr, _ := ipv4ToUint32(GetSubnetAddr(ipRange, subnetLen))
lastAddr, _ := ipv4ToUint32(getLastAddrInSubnet(ipRange, subnetLen))
// Set bits lower than rangeMin as used
for i = 0; i < (rangeMin - firstAddr); i++ {
ipAllocMap.Set(uint(i))
}
// Set bits greater than the rangeMax as used
for i = ((rangeMin - firstAddr) + ((rangeMax - rangeMin) + 1)); i < (lastAddr - firstAddr); i++ {
ipAllocMap.Set(uint(i))
}
}
// InitSubnetBitset initializes a bit set with 2^(32 - subnetLen) bits
func InitSubnetBitset(b *bitset.BitSet, subnetLen uint) {
maxSize := (1 << (32 - subnetLen)) - 1
b.Set(uint(maxSize))
b.Set(uint(0))
}