mirror of https://github.com/k3s-io/k3s
40 lines
1.4 KiB
Go
40 lines
1.4 KiB
Go
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// 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. The low level primitives for netlink are contained
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// in the nl subpackage. This package attempts to provide a high-level
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// interface that is loosly modeled on the iproute2 cli.
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package netlink
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import (
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"errors"
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"net"
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)
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var (
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// ErrNotImplemented is returned when a requested feature is not implemented.
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ErrNotImplemented = errors.New("not implemented")
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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: ip, Mask: ipNet.Mask}, nil
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}
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// NewIPNet generates an IPNet from an ip address using a netmask of 32 or 128.
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func NewIPNet(ip net.IP) *net.IPNet {
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if ip.To4() != nil {
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return &net.IPNet{IP: ip, Mask: net.CIDRMask(32, 32)}
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}
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return &net.IPNet{IP: ip, Mask: net.CIDRMask(128, 128)}
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}
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