Function processPrefix

main.go:190–201

Sends every /24 block inside prefix to out. Anything already /24 or smaller collapses to the single /24 that covers it.

(prefix netip.Prefix, out chan<- netip.Prefix)

// Sends every /24 block inside prefix to out. Anything already /24 or smaller
// collapses to the single /24 that covers it.
func processPrefix(prefix netip.Prefix, out chan<- netip.Prefix) {
	bits := prefix.Bits()
	if bits >= 24 {
		out <- netip.PrefixFrom(prefix.Addr(), 24).Masked()
		return
	}
	ip := prefix.Addr()
	for i := 0; i < 1<<(24-bits); i++ {
		out <- netip.PrefixFrom(ip, 24).Masked()
		ip = incrementIP(ip, 256)
	}
}

// Returns ip advanced by increment, using plain IPv4 (uint32) math.
func incrementIP(ip netip.Addr, increment int) netip.Addr {