ipam

func Add ¶

func Add(ip net.IP, number int) net.IP

Add increments the given IP by the number. e.g: add(10.0.4.0, 1) -> 10.0.4.1. Negative values are allowed for decrementing.

func Broadcast ¶

func Broadcast(network net.IPNet) net.IP

Broadcast takes a net.IPNet and returns the broadcast address as net.IP

func CalculateSubnetMask ¶

func CalculateSubnetMask(networkMask net.IPMask, n uint) (net.IPMask, error)

CalculateSubnetMask calculates new subnet mask to accommodate n subnets.

func CanonicalizeSubnets ¶

func CanonicalizeSubnets(networkRange net.IPNet, subnets []net.IPNet) []net.IPNet

CanonicalizeSubnets iterates over subnets and returns deduplicated list of networks that belong to networkRange. Subnets that overlap each other but aren't exactly the same are not removed. Subnets are returned in the same order as they appear in input.

Example:

networkRange: 192.168.2.0/24
subnets: [172.168.2.0/25, 192.168.2.0/25, 192.168.3.128/25, 192.168.2.0/25, 192.168.2.128/25]
returned: [192.168.2.0/25, 192.168.2.128/25]

Example 2:

networkRange: 10.0.0.0/8
subnets: [10.1.0.0/16, 10.1.0.0/24, 10.1.1.0/24]
returned: [10.1.0.0/16, 10.1.0.0/24, 10.1.1.0/24]

func Contains ¶

func Contains(network, subnet net.IPNet) bool

Contains returns true when the subnet is a part of the network, false otherwise.

func Free ¶

func Free(network net.IPNet, mask net.IPMask, subnets []net.IPNet) (net.IPNet, error)

Free takes a network, a mask, and a list of subnets. An available network, within the first network, is returned.

func Half ¶

func Half(network net.IPNet) (first, second net.IPNet, err error)

Half takes a network and returns two subnets which split the network in half.

func IPLessThan ¶

func IPLessThan(a, b net.IP) bool

IPLessThan compare two ip addresses by section left-most is most significant

func NetIPInSlice ¶

func NetIPInSlice(a net.IP, list []net.IP) int

NetIPInSlice makes it easy to assess if an IP address is present in a list of ips

func Split ¶

func Split(network net.IPNet, n uint) ([]net.IPNet, error)

Split returns n subnets from network.

func SubnetWithin ¶

func SubnetWithin(network net.IPNet, hostNumber int) (net.IPNet, error)

SubnetWithin returns the smallest subnet than can contain (size) hosts