Initial commit of libcontainer

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

libcontainer/network/network.go

@@ -0,0 +1,104 @@
+package network
+
+import (
+	"errors"
+	"github.com/dotcloud/docker/pkg/netlink"
+	"net"
+)
+
+var (
+	ErrNoDefaultRoute = errors.New("no default network route found")
+)
+
+func InterfaceUp(name string) error {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+	return netlink.NetworkLinkUp(iface)
+}
+
+func InterfaceDown(name string) error {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+	return netlink.NetworkLinkDown(iface)
+}
+
+func ChangeInterfaceName(old, newName string) error {
+	iface, err := net.InterfaceByName(old)
+	if err != nil {
+		return err
+	}
+	return netlink.NetworkChangeName(iface, newName)
+}
+
+func CreateVethPair(name1, name2 string) error {
+	return netlink.NetworkCreateVethPair(name1, name2)
+}
+
+func SetInterfaceInNamespacePid(name string, nsPid int) error {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+	return netlink.NetworkSetNsPid(iface, nsPid)
+}
+
+func SetInterfaceInNamespaceFd(name string, fd int) error {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+	return netlink.NetworkSetNsFd(iface, fd)
+}
+
+func SetInterfaceMaster(name, master string) error {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+	masterIface, err := net.InterfaceByName(master)
+	if err != nil {
+		return err
+	}
+	return netlink.NetworkSetMaster(iface, masterIface)
+}
+
+func SetDefaultGateway(ip string) error {
+	return netlink.AddDefaultGw(net.ParseIP(ip))
+}
+
+func SetInterfaceIp(name string, rawIp string) error {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+	ip, ipNet, err := net.ParseCIDR(rawIp)
+	if err != nil {
+		return err
+	}
+	return netlink.NetworkLinkAddIp(iface, ip, ipNet)
+}
+
+func SetMtu(name string, mtu int) error {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+	return netlink.NetworkSetMTU(iface, mtu)
+}
+
+func GetDefaultMtu() (int, error) {
+	routes, err := netlink.NetworkGetRoutes()
+	if err != nil {
+		return -1, err
+	}
+	for _, r := range routes {
+		if r.Default {
+			return r.Iface.MTU, nil
+		}
+	}
+	return -1, ErrNoDefaultRoute
+}