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// Copyright 2018 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.
// This is a "meta-plugin". It reads in its own netconf, combines it with
// the data from flannel generated subnet file and then invokes a plugin
// like bridge or ipvlan to do the real work.
package main
import (
"context"
"encoding/json"
"fmt"
"os"
"github.com/containernetworking/cni/pkg/invoke"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
)
// Return IPAM section for Delegate using input IPAM if present and replacing
// or complementing as needed.
func getDelegateIPAM(n *NetConf, fenv *subnetEnv) (map[string]interface{}, error) {
ipam := n.IPAM
if ipam == nil {
ipam = map[string]interface{}{}
}
if !hasKey(ipam, "type") {
ipam["type"] = "host-local"
}
ipam["subnet"] = fenv.sn.String()
rtes, err := getIPAMRoutes(n)
if err != nil {
return nil, fmt.Errorf("failed to read IPAM routes: %w", err)
}
rtes = append(rtes, types.Route{Dst: *fenv.nw})
ipam["routes"] = rtes
return ipam, nil
}
func doCmdAdd(args *skel.CmdArgs, n *NetConf, fenv *subnetEnv) error {
n.Delegate["name"] = n.Name
if !hasKey(n.Delegate, "type") {
n.Delegate["type"] = "bridge"
}
if !hasKey(n.Delegate, "ipMasq") {
// if flannel is not doing ipmasq, we should
ipmasq := !*fenv.ipmasq
n.Delegate["ipMasq"] = ipmasq
}
if !hasKey(n.Delegate, "mtu") {
mtu := fenv.mtu
n.Delegate["mtu"] = mtu
}
if n.Delegate["type"].(string) == "bridge" {
if !hasKey(n.Delegate, "isGateway") {
n.Delegate["isGateway"] = true
}
}
if n.CNIVersion != "" {
n.Delegate["cniVersion"] = n.CNIVersion
}
ipam, err := getDelegateIPAM(n, fenv)
if err != nil {
return fmt.Errorf("failed to assemble Delegate IPAM: %w", err)
}
n.Delegate["ipam"] = ipam
return delegateAdd(args.ContainerID, n.DataDir, n.Delegate)
}
func doCmdDel(args *skel.CmdArgs, n *NetConf) (err error) {
cleanup, netConfBytes, err := consumeScratchNetConf(args.ContainerID, n.DataDir)
if err != nil {
if os.IsNotExist(err) {
// Per spec should ignore error if resources are missing / already removed
return nil
}
return err
}
// cleanup will work when no error happens
defer func() {
cleanup(err)
}()
nc := &types.NetConf{}
if err = json.Unmarshal(netConfBytes, nc); err != nil {
return fmt.Errorf("failed to parse netconf: %v", err)
}
return invoke.DelegateDel(context.TODO(), nc.Type, netConfBytes, nil)
}
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