06b397912b
Updates the spec and plugins to return an array of interfaces and IP details to the runtime including: - interface names and MAC addresses configured by the plugin - whether the interfaces are sandboxed (container/VM) or host (bridge, veth, etc) - multiple IP addresses configured by IPAM and which interface they have been assigned to Returning interface details is useful for runtimes, as well as allowing more flexible chaining of CNI plugins themselves. For example, some meta plugins may need to know the host-side interface to be able to apply firewall or traffic shaping rules to the container.
94 lines
2.6 KiB
Go
94 lines
2.6 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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"net"
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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/containernetworking/cni/pkg/types/current"
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"github.com/vishvananda/netlink"
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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 *current.Result) error {
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if len(res.Interfaces) == 0 {
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return fmt.Errorf("no interfaces to configure")
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}
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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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var v4gw, v6gw net.IP
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for _, ipc := range res.IPs {
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if int(ipc.Interface) >= len(res.Interfaces) || res.Interfaces[ipc.Interface].Name != ifName {
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// IP address is for a different interface
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return fmt.Errorf("failed to add IP addr %v to %q: invalid interface index", ipc, ifName)
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}
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addr := &netlink.Addr{IPNet: &ipc.Address, 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 %v to %q: %v", ipc, ifName, err)
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}
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gwIsV4 := ipc.Gateway.To4() != nil
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if gwIsV4 && v4gw == nil {
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v4gw = ipc.Gateway
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} else if !gwIsV4 && v6gw == nil {
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v6gw = ipc.Gateway
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}
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}
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for _, r := range res.Routes {
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routeIsV4 := r.Dst.IP.To4() != nil
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gw := r.GW
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if gw == nil {
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if routeIsV4 && v4gw != nil {
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gw = v4gw
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} else if !routeIsV4 && v6gw != nil {
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gw = v6gw
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}
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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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