cidr

func AddressCount ¶

func AddressCount(network *net.IPNet) uint64

AddressCount returns the number of distinct host addresses within the given CIDR range.

Since the result is a uint64, this function returns meaningful information only for IPv4 ranges and IPv6 ranges with a prefix size of at least 65.

func AddressRange ¶

func AddressRange(network *net.IPNet) (net.IP, net.IP)

AddressRange returns the first and last addresses in the given CIDR range.

func Dec ¶

func Dec(IP net.IP) net.IP

Dec decreases the IP by one this returns a new []byte for the IP

func Host ¶

func Host(base *net.IPNet, num int) (net.IP, error)

Host takes a parent CIDR range and turns it into a host IP address with the given host number.

For example, 10.3.0.0/16 with a host number of 2 gives 10.3.0.2.

func Inc ¶

func Inc(IP net.IP) net.IP

Inc increases the IP by one this returns a new []byte for the IP

func LoopForEachAddressInCIDR ¶

func LoopForEachAddressInCIDR(ipnet *net.IPNet, f func(ip net.IP) bool)

func NextSubnet ¶

func NextSubnet(network *net.IPNet, prefixLen int) (*net.IPNet, bool)

NextSubnet returns the next available subnet of the desired mask size starting for the maximum IP of the offset subnet If the IP exceeds the maxium IP then the second return value is true

func PreviousSubnet ¶

func PreviousSubnet(network *net.IPNet, prefixLen int) (*net.IPNet, bool)

PreviousSubnet returns the subnet of the desired mask in the IP space just lower than the start of IPNet provided. If the IP space rolls over then the second return value is true

func Subnet ¶

func Subnet(base *net.IPNet, newBits int, num int) (*net.IPNet, error)

Subnet takes a parent CIDR range and creates a subnet within it with the given number of additional prefix bits and the given network number.

For example, 10.3.0.0/16, extended by 8 bits, with a network number of 5, becomes 10.3.5.0/24 .

func VerifyNoOverlap ¶

func VerifyNoOverlap(subnets []*net.IPNet, CIDRBlock *net.IPNet) error

VerifyNoOverlap takes a list subnets and supernet (CIDRBlock) and verifies none of the subnets overlap and all subnets are in the supernet it returns an error if any of those conditions are not satisfied