ipbits

func Add ¶

func Add(ip netip.Addr, x uint64, shift uint) netip.Addr

Add returns ip + (x << shift).

func Field ¶

func Field(ip netip.Addr, u, v uint) uint64

Field returns the value of the bitfield [u, v] in ip as an integer, where bit 0 is the most-significant bit of ip.

The result is undefined if u > v, if v-u > 64, or if u or v is larger than ip.BitLen().

func SubnetsBetween ¶

func SubnetsBetween(a1 netip.Addr, a2 netip.Addr, sz int) uint64

SubnetsBetween computes the number of subnets of size 'sz' available between 'a1' and 'a2'. The result is capped at math.MaxUint64. It returns 0 when one of 'a1' or 'a2' is invalid, if both aren't of the same family, or when 'a2' is less than 'a1'.