vendor: add CNI invoke, ip, ipam, and hwaddr packages

vendor/github.com/vishvananda/netlink/netlink.go

@@ -0,0 +1,39 @@
+// 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. The low level primitives for netlink are contained
+// in the nl subpackage. This package attempts to provide a high-level
+// interface that is loosly modeled on the iproute2 cli.
+package netlink
+
+import (
+	"errors"
+	"net"
+)
+
+var (
+	// ErrNotImplemented is returned when a requested feature is not implemented.
+	ErrNotImplemented = errors.New("not implemented")
+)
+
+// 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: ip, Mask: ipNet.Mask}, nil
+}
+
+// NewIPNet generates an IPNet from an ip address using a netmask of 32 or 128.
+func NewIPNet(ip net.IP) *net.IPNet {
+	if ip.To4() != nil {
+		return &net.IPNet{IP: ip, Mask: net.CIDRMask(32, 32)}
+	}
+	return &net.IPNet{IP: ip, Mask: net.CIDRMask(128, 128)}
+}