// Package netlink provides a simple library for netlink. Netlink is // the interface a user-space program in linux uses to communicate with // the kernel. It can be used to add and remove interfaces, set up ip // addresses and routes, and confiugre ipsec. Netlink communication // requires elevated privileges, so in most cases this code needs to // be run as root. In addition to dealing with netlink primitives, the // library attempts to provide an high-level interface that is loosly // modeled on the iproute2 command line interface. package netlink import ( "net" "syscall" ) const ( // Family type definitions FAMILY_ALL = syscall.AF_UNSPEC FAMILY_V4 = syscall.AF_INET FAMILY_V6 = syscall.AF_INET6 ) // GetIPFamily returns the family type of a net.IP. func GetIPFamily(ip net.IP) int { if len(ip) <= net.IPv4len { return FAMILY_V4 } if ip.To4() != nil { return FAMILY_V4 } return FAMILY_V6 } // ParseIPNet parses a string in ip/net format and returns a net.IPNet. // This is valuable because addresses in netlink are often IPNets and // ParseCIDR returns an IPNet with the IP part set to the base IP of the // range. func ParseIPNet(s string) (*net.IPNet, error) { ip, ipNet, err := net.ParseCIDR(s) if err != nil { return nil, err } return &net.IPNet{ip, ipNet.Mask}, nil } // NewIPNet generates an IPNet from an ip address using a netmask of 32. func NewIPNet(ip net.IP) (*net.IPNet) { return &net.IPNet{ip, net.CIDRMask(32, 32)} }