Add CNI networking to system-docker

vendor/github.com/containernetworking/cni/pkg/ipam/ipam.go

@@ -0,0 +1,68 @@
+// Copyright 2015 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ipam
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/containernetworking/cni/pkg/invoke"
+	"github.com/containernetworking/cni/pkg/ip"
+	"github.com/containernetworking/cni/pkg/types"
+
+	"github.com/vishvananda/netlink"
+)
+
+func ExecAdd(plugin string, netconf []byte) (*types.Result, error) {
+	return invoke.DelegateAdd(plugin, netconf)
+}
+
+func ExecDel(plugin string, netconf []byte) error {
+	return invoke.DelegateDel(plugin, netconf)
+}
+
+// ConfigureIface takes the result of IPAM plugin and
+// applies to the ifName interface
+func ConfigureIface(ifName string, res *types.Result) error {
+	link, err := netlink.LinkByName(ifName)
+	if err != nil {
+		return fmt.Errorf("failed to lookup %q: %v", ifName, err)
+	}
+
+	if err := netlink.LinkSetUp(link); err != nil {
+		return fmt.Errorf("failed to set %q UP: %v", ifName, err)
+	}
+
+	// TODO(eyakubovich): IPv6
+	addr := &netlink.Addr{IPNet: &res.IP4.IP, Label: ""}
+	if err = netlink.AddrAdd(link, addr); err != nil {
+		return fmt.Errorf("failed to add IP addr to %q: %v", ifName, err)
+	}
+
+	for _, r := range res.IP4.Routes {
+		gw := r.GW
+		if gw == nil {
+			gw = res.IP4.Gateway
+		}
+		if err = ip.AddRoute(&r.Dst, gw, link); err != nil {
+			// we skip over duplicate routes as we assume the first one wins
+			if !os.IsExist(err) {
+				return fmt.Errorf("failed to add route '%v via %v dev %v': %v", r.Dst, gw, ifName, err)
+			}
+		}
+	}
+
+	return nil
+}