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