109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
// Copyright 2015 CNI authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ipam
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import (
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"fmt"
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"os"
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"github.com/containernetworking/cni/pkg/invoke"
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"github.com/containernetworking/cni/pkg/ip"
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"github.com/containernetworking/cni/pkg/types"
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"github.com/vishvananda/netlink"
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"net"
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"strconv"
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"strings"
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)
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const (
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// private mac prefix safe to use
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privateMACPrefix = "0a:58"
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// veth link dev type
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vethLinkType = "veth"
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)
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func ExecAdd(plugin string, netconf []byte) (*types.Result, error) {
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return invoke.DelegateAdd(plugin, netconf)
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}
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func ExecDel(plugin string, netconf []byte) error {
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return invoke.DelegateDel(plugin, netconf)
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}
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// ConfigureIface takes the result of IPAM plugin and
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// applies to the ifName interface
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func ConfigureIface(ifName string, res *types.Result) error {
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link, err := netlink.LinkByName(ifName)
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if err != nil {
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return fmt.Errorf("failed to lookup %q: %v", ifName, err)
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}
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if err := netlink.LinkSetUp(link); err != nil {
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return fmt.Errorf("failed to set %q UP: %v", ifName, err)
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}
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// only set hardware address to veth when using ipv4
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if link.Type() == vethLinkType && res.IP4 != nil {
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hwAddr, err := generateHardwareAddr(res.IP4.IP.IP)
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if err != nil {
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return fmt.Errorf("failed to generate hardware addr: %v", err)
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}
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if err = netlink.LinkSetHardwareAddr(link, hwAddr); err != nil {
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return fmt.Errorf("failed to add hardware addr to %q: %v", ifName, err)
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}
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}
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// TODO(eyakubovich): IPv6
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addr := &netlink.Addr{IPNet: &res.IP4.IP, Label: ""}
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if err = netlink.AddrAdd(link, addr); err != nil {
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return fmt.Errorf("failed to add IP addr to %q: %v", ifName, err)
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}
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for _, r := range res.IP4.Routes {
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gw := r.GW
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if gw == nil {
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gw = res.IP4.Gateway
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}
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if err = ip.AddRoute(&r.Dst, gw, link); err != nil {
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// we skip over duplicate routes as we assume the first one wins
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if !os.IsExist(err) {
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return fmt.Errorf("failed to add route '%v via %v dev %v': %v", r.Dst, gw, ifName, err)
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}
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}
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}
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return nil
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}
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// generateHardwareAddr generates 48 bit virtual mac addresses based on the IP input.
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func generateHardwareAddr(ip net.IP) (net.HardwareAddr, error) {
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if ip.To4() == nil {
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return nil, fmt.Errorf("generateHardwareAddr only support valid ipv4 address as input")
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}
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mac := privateMACPrefix
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sections := strings.Split(ip.String(), ".")
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for _, s := range sections {
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i, _ := strconv.Atoi(s)
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mac = mac + ":" + fmt.Sprintf("%02x", i)
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}
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hwAddr, err := net.ParseMAC(mac)
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if err != nil {
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return nil, fmt.Errorf("Failed to parse mac address %s generated based on ip %s due to: %v", mac, ip, err)
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}
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return hwAddr, nil
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}
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