Merge pull request #982 from jingyuanliang/patch-1

Bump to golang:1.21-alpine in release.sh

.github/actions/retest-action/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.10
+FROM alpine:3.18
 
 RUN apk add --no-cache curl jq
 

.github/actions/retest-action/action.yml

@@ -8,4 +8,4 @@ runs:
   using: 'docker'
   image: 'Dockerfile'
   env:
-    GITHUB_TOKEN: ${{ inputs.token }}
+    GITHUB_TOKEN: ${{ inputs.token }}

.github/actions/retest-action/entrypoint.sh

@@ -27,10 +27,10 @@ curl --request GET \
     --header "authorization: Bearer ${GITHUB_TOKEN}" \
     --header "content-type: application/json" | jq '.workflow_runs | max_by(.run_number)' > run.json
 
-RERUN_URL=$(jq -r '.rerun_url' run.json)
+RUN_URL=$(jq -r '.rerun_url' run.json)
 
 curl --request POST \
-    --url "${RERUN_URL}" \
+    --url "${RUN_URL}/rerun-failed-jobs" \
     --header "authorization: Bearer ${GITHUB_TOKEN}" \
     --header "content-type: application/json"
 
@@ -42,4 +42,4 @@ curl --request POST \
     --header "authorization: Bearer ${GITHUB_TOKEN}" \
     --header "accept: application/vnd.github.squirrel-girl-preview+json" \
     --header "content-type: application/json" \
-    --data '{ "content" : "rocket" }'
+    --data '{ "content" : "rocket" }'

.github/dependabot.yml

@@ -0,0 +1,23 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "docker"  # See documentation for possible values
+    directory: "/.github/actions/retest-action"  # Location of package manifests
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "github-actions"  # See documentation for possible values
+    directory: "/"  # Location of package manifests
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "gomod"  # See documentation for possible values
+    directory: "/"  # Location of package manifests
+    schedule:
+      interval: "weekly"
+    groups:
+      golang:
+        patterns:
+          - "*"

.github/workflows/commands.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Re-Test Action
         uses: ./.github/actions/retest-action

.github/workflows/test.yaml

@@ -4,20 +4,36 @@ name: test
 on: ["push", "pull_request"]
 
 env:
-  GO_VERSION: "1.17"
-  LINUX_ARCHES: "amd64 386 arm arm64 s390x mips64le ppc64le"
+  GO_VERSION: "1.21"
+  LINUX_ARCHES: "amd64 386 arm arm64 s390x mips64le ppc64le riscv64"
 
 jobs:
-  build:
-    name: Build all linux architectures
+  lint:
+    name: Lint
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
       - name: setup go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: ${{ env.GO_VERSION }}
-      - uses: actions/checkout@v2
-
+          go-version-file: go.mod
+      - uses: ibiqlik/action-yamllint@v3
+        with:
+          format: auto
+      - uses: golangci/golangci-lint-action@v3
+        with:
+          args: -v
+          skip-cache: true
+  build:
+    name: Build all linux architectures
+    needs: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: setup go
+        uses: actions/setup-go@v4
+        with:
+          go-version-file: go.mod
       - name: Build on all supported architectures
         run: |
           set -e
@@ -26,9 +42,9 @@ jobs:
             GOARCH=$arch ./build_linux.sh
             rm bin/*
           done
-
   test-linux:
     name: Run tests on Linux amd64
+    needs: build
     runs-on: ubuntu-latest
     steps:
       - name: Install kernel module
@@ -37,24 +53,21 @@ jobs:
           sudo apt-get install linux-modules-extra-$(uname -r)
       - name: Install nftables
         run: sudo apt-get install nftables
-
+      - uses: actions/checkout@v4
       - name: setup go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
       - name: Set up Go for root
         run: |
           sudo ln -sf `which go` `sudo which go` || true
           sudo go version
-      - uses: actions/checkout@v2
 
       - name: Install test binaries
-        env:
-          GO111MODULE: off
         run: |
-          go get github.com/containernetworking/cni/cnitool
-          go get github.com/mattn/goveralls
-          go get github.com/modocache/gover
+          go install github.com/containernetworking/cni/cnitool@latest
+          go install github.com/mattn/goveralls@latest
+          go install github.com/modocache/gover@latest
 
       - name: test
         run: PATH=$PATH:$(go env GOPATH)/bin COVERALLS=1 ./test_linux.sh
@@ -66,15 +79,15 @@ jobs:
           PATH=$PATH:$(go env GOPATH)/bin
           gover
           goveralls -coverprofile=gover.coverprofile -service=github
-
   test-win:
     name: Build and run tests on Windows
+    needs: build
     runs-on: windows-latest
     steps:
+      - uses: actions/checkout@v4
       - name: setup go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: ${{ env.GO_VERSION }}
-      - uses: actions/checkout@v2
+          go-version-file: go.mod
       - name: test
         run: bash ./test_windows.sh

.golangci.yml

@@ -0,0 +1,45 @@
+issues:
+  exclude-rules:
+    - linters:
+        - revive
+      text: "don't use ALL_CAPS in Go names; use CamelCase"
+    - linters:
+        - revive
+      text: " and that stutters;"
+    - path: '(.+)_test\.go'
+      text: "dot-imports: should not use dot imports"
+
+linters:
+  disable:
+    - errcheck
+  enable:
+    - contextcheck
+    - durationcheck
+    - gci
+    - ginkgolinter
+    - gocritic
+    - gofumpt
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
+    - nonamedreturns
+    - predeclared
+    - revive
+    - staticcheck
+    - unconvert
+    - unparam
+    - unused
+    - wastedassign
+
+linters-settings:
+  gci:
+    sections:
+      - standard
+      - default
+      - prefix(github.com/containernetworking)
+
+run:
+  skip-dirs:
+    - vendor
+  timeout: 5m

.yamllint.yml

@@ -0,0 +1,12 @@
+extends: default
+
+ignore: |
+  vendor
+
+rules:
+  document-start: disable
+  line-length: disable
+  truthy:
+    ignore: |
+      .github/workflows/*.yml
+      .github/workflows/*.yaml

OWNERS.md

@@ -7,3 +7,4 @@ This is the official list of the CNI network plugins owners:
 - Matt Dupre <matt@tigera.io> (@matthewdupre)
 - Michael Cambria <mcambria@redhat.com> (@mccv1r0)
 - Piotr Skarmuk <piotr.skarmuk@gmail.com> (@jellonek)
+- Michael Zappa <michael.zappa@gmail.com> (@MikeZappa87)

README.md

@@ -14,13 +14,14 @@ Read [CONTRIBUTING](CONTRIBUTING.md) for build and test instructions.
 * `ptp`: Creates a veth pair.
 * `vlan`: Allocates a vlan device.
 * `host-device`: Move an already-existing device into a container.
+* `dummy`: Creates a new Dummy device in the container.
 #### Windows: Windows specific
 * `win-bridge`: Creates a bridge, adds the host and the container to it.
 * `win-overlay`: Creates an overlay interface to the container.
 ### IPAM: IP address allocation
 * `dhcp`: Runs a daemon on the host to make DHCP requests on behalf of the container
 * `host-local`: Maintains a local database of allocated IPs
-* `static`:  Allocate a static IPv4/IPv6 addresses to container and it's useful in debugging purpose.
+* `static`:  Allocate a single static IPv4/IPv6 address to container. It's useful in debugging purpose.
 
 ### Meta: other plugins
 * `tuning`: Tweaks sysctl parameters of an existing interface

build_linux.sh

@@ -1,8 +1,8 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 set -e
 cd "$(dirname "$0")"
 
-if [ "$(uname)" == "Darwin" ]; then
+if [ "$(uname)" = "Darwin" ]; then
 	export GOOS="${GOOS:-linux}"
 fi
 

build_windows.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 set -e
 cd "$(dirname "$0")"
 

go.mod

@@ -1,40 +1,50 @@
 module github.com/containernetworking/plugins
 
-go 1.17
+go 1.20
 
 require (
-	github.com/Microsoft/hcsshim v0.8.20
-	github.com/alexflint/go-filemutex v1.1.0
+	github.com/Microsoft/hcsshim v0.11.4
+	github.com/alexflint/go-filemutex v1.2.0
 	github.com/buger/jsonparser v1.1.1
-	github.com/containernetworking/cni v1.0.1
-	github.com/coreos/go-iptables v0.6.0
-	github.com/coreos/go-systemd/v22 v22.3.2
+	github.com/containernetworking/cni v1.1.2
+	github.com/coreos/go-iptables v0.7.0
+	github.com/coreos/go-systemd/v22 v22.5.0
 	github.com/d2g/dhcp4 v0.0.0-20170904100407-a1d1b6c41b1c
 	github.com/d2g/dhcp4client v1.0.0
 	github.com/d2g/dhcp4server v0.0.0-20181031114812-7d4a0a7f59a5
-	github.com/godbus/dbus/v5 v5.0.4
+	github.com/godbus/dbus/v5 v5.1.0
 	github.com/mattn/go-shellwords v1.0.12
-	github.com/networkplumbing/go-nft v0.2.0
-	github.com/onsi/ginkgo v1.16.4
-	github.com/onsi/gomega v1.15.0
-	github.com/safchain/ethtool v0.0.0-20210803160452-9aa261dae9b1
-	github.com/vishvananda/netlink v1.1.1-0.20210330154013-f5de75959ad5
-	golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e
+	github.com/networkplumbing/go-nft v0.4.0
+	github.com/onsi/ginkgo/v2 v2.13.2
+	github.com/onsi/gomega v1.30.0
+	github.com/opencontainers/selinux v1.11.0
+	github.com/safchain/ethtool v0.3.0
+	github.com/vishvananda/netlink v1.2.1-beta.2
+	golang.org/x/sys v0.15.0
 )
 
 require (
-	github.com/Microsoft/go-winio v0.4.17 // indirect
-	github.com/containerd/cgroups v1.0.1 // indirect
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/containerd/cgroups v1.1.0 // indirect
+	github.com/containerd/containerd v1.6.23 // indirect
+	github.com/d2g/hardwareaddr v0.0.0-20190221164911-e7d9fbe030e4 // indirect
+	github.com/go-logr/logr v1.3.0 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
-	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
-	github.com/nxadm/tail v1.4.8 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/pprof v0.0.0-20230323073829-e72429f035bd // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/sirupsen/logrus v1.8.1 // indirect
-	github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f // indirect
-	go.opencensus.io v0.22.3 // indirect
-	golang.org/x/net v0.0.0-20210428140749-89ef3d95e781 // indirect
-	golang.org/x/text v0.3.6 // indirect
-	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
+	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/vishvananda/netns v0.0.4 // indirect
+	go.opencensus.io v0.24.0 // indirect
+	golang.org/x/mod v0.13.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/text v0.13.0 // indirect
+	golang.org/x/tools v0.14.0 // indirect
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
+	google.golang.org/grpc v1.56.3 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

integration/integration_linux_test.go

@@ -4,7 +4,7 @@
 // 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
+//	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,
@@ -14,21 +14,20 @@
 package integration_test
 
 import (
+	"bytes"
 	"fmt"
+	"io"
 	"math/rand"
+	"net"
 	"os"
 	"os/exec"
 	"path/filepath"
-
-	"bytes"
-	"io"
-	"net"
 	"regexp"
 	"strconv"
 	"strings"
 	"time"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 	"github.com/onsi/gomega/gbytes"
 	"github.com/onsi/gomega/gexec"
@@ -148,8 +147,8 @@ var _ = Describe("Basic PTP using cnitool", func() {
 			basicBridgeEnv.runInNS(hostNS, cnitoolBin, "del", "network-chain-test", contNS2.LongName())
 		})
 
-		Measure("limits traffic only on the restricted bandwith veth device", func(b Benchmarker) {
-			ipRegexp := regexp.MustCompile("10\\.1[12]\\.2\\.\\d{1,3}")
+		Measure("limits traffic only on the restricted bandwidth veth device", func(b Benchmarker) {
+			ipRegexp := regexp.MustCompile(`10\.1[12]\.2\.\d{1,3}`)
 
 			By(fmt.Sprintf("adding %s to %s\n\n", "chained-bridge-bandwidth", contNS1.ShortName()))
 			chainedBridgeBandwidthEnv.runInNS(hostNS, cnitoolBin, "add", "network-chain-test", contNS1.LongName())
@@ -162,27 +161,24 @@ var _ = Describe("Basic PTP using cnitool", func() {
 			Expect(basicBridgeIP).To(ContainSubstring("10.11.2."))
 
 			var chainedBridgeBandwidthPort, basicBridgePort int
-			var err error
 
 			By(fmt.Sprintf("starting echo server in %s\n\n", contNS1.ShortName()))
-			chainedBridgeBandwidthPort, chainedBridgeBandwidthSession, err = startEchoServerInNamespace(contNS1)
-			Expect(err).ToNot(HaveOccurred())
+			chainedBridgeBandwidthPort, chainedBridgeBandwidthSession = startEchoServerInNamespace(contNS1)
 
 			By(fmt.Sprintf("starting echo server in %s\n\n", contNS2.ShortName()))
-			basicBridgePort, basicBridgeSession, err = startEchoServerInNamespace(contNS2)
-			Expect(err).ToNot(HaveOccurred())
+			basicBridgePort, basicBridgeSession = startEchoServerInNamespace(contNS2)
 
 			packetInBytes := 20000 // The shaper needs to 'warm'. Send enough to cause it to throttle,
 			// balanced by run time.
 
 			By(fmt.Sprintf("sending tcp traffic to the chained, bridged, traffic shaped container on ip address '%s:%d'\n\n", chainedBridgeIP, chainedBridgeBandwidthPort))
 			runtimeWithLimit := b.Time("with chained bridge and bandwidth plugins", func() {
-				makeTcpClientInNS(hostNS.ShortName(), chainedBridgeIP, chainedBridgeBandwidthPort, packetInBytes)
+				makeTCPClientInNS(hostNS.ShortName(), chainedBridgeIP, chainedBridgeBandwidthPort, packetInBytes)
 			})
 
 			By(fmt.Sprintf("sending tcp traffic to the basic bridged container on ip address '%s:%d'\n\n", basicBridgeIP, basicBridgePort))
 			runtimeWithoutLimit := b.Time("with basic bridged plugin", func() {
-				makeTcpClientInNS(hostNS.ShortName(), basicBridgeIP, basicBridgePort, packetInBytes)
+				makeTCPClientInNS(hostNS.ShortName(), basicBridgeIP, basicBridgePort, packetInBytes)
 			})
 
 			Expect(runtimeWithLimit).To(BeNumerically(">", runtimeWithoutLimit+1000*time.Millisecond))
@@ -224,7 +220,7 @@ func (n Namespace) Del() {
 	(TestEnv{}).run("ip", "netns", "del", string(n))
 }
 
-func makeTcpClientInNS(netns string, address string, port int, numBytes int) {
+func makeTCPClientInNS(netns string, address string, port int, numBytes int) {
 	payload := bytes.Repeat([]byte{'a'}, numBytes)
 	message := string(payload)
 
@@ -243,7 +239,7 @@ func makeTcpClientInNS(netns string, address string, port int, numBytes int) {
 	Expect(string(out)).To(Equal(message))
 }
 
-func startEchoServerInNamespace(netNS Namespace) (int, *gexec.Session, error) {
+func startEchoServerInNamespace(netNS Namespace) (int, *gexec.Session) {
 	session, err := startInNetNS(echoServerBinaryPath, netNS)
 	Expect(err).NotTo(HaveOccurred())
 
@@ -260,7 +256,7 @@ func startEchoServerInNamespace(netNS Namespace) (int, *gexec.Session, error) {
 		io.Copy(GinkgoWriter, io.MultiReader(session.Out, session.Err))
 	}()
 
-	return port, session, nil
+	return port, session
 }
 
 func startInNetNS(binPath string, namespace Namespace) (*gexec.Session, error) {

integration/integration_suite_test.go

@@ -4,7 +4,7 @@
 // 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
+//	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,
@@ -17,7 +17,7 @@ import (
 	"strings"
 	"testing"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 	"github.com/onsi/gomega/gexec"
 )

pkg/hns/endpoint_windows.go

@@ -39,6 +39,7 @@ type EndpointInfo struct {
 	NetworkId    string
 	Gateway      net.IP
 	IpAddress    net.IP
+	MacAddress  string
 }
 
 // GetSandboxContainerID returns the sandbox ID of this pod.
@@ -248,6 +249,7 @@ func GenerateHcnEndpoint(epInfo *EndpointInfo, n *NetConf) (*hcn.HostComputeEndp
 			Minor: 0,
 		},
 		Name:               epInfo.EndpointName,
+		MacAddress: epInfo.MacAddress,
 		HostComputeNetwork: epInfo.NetworkId,
 		Dns: hcn.Dns{
 			Domain:     epInfo.DNS.Domain,
@@ -280,6 +282,16 @@ func RemoveHcnEndpoint(epName string) error {
 		}
 		return errors.Annotatef(err, "failed to find HostComputeEndpoint %s", epName)
 	}
+	epNamespace, err := hcn.GetNamespaceByID(hcnEndpoint.HostComputeNamespace)
+	if err != nil && !hcn.IsNotFoundError(err) {
+		return errors.Annotatef(err, "failed to get HostComputeNamespace %s", epName)
+	}
+	if epNamespace != nil {
+		err = hcn.RemoveNamespaceEndpoint(hcnEndpoint.HostComputeNamespace, hcnEndpoint.Id)
+		if err != nil && !hcn.IsNotFoundError(err) {
+			return errors.Annotatef(err,"error removing endpoint: %s from namespace", epName)
+		}
+	}
 
 	err = hcnEndpoint.Delete()
 	if err != nil {

pkg/hns/netconf_suite_windows_test.go

@@ -14,7 +14,7 @@
 package hns
 
 import (
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 
 	"testing"

pkg/hns/netconf_windows_test.go

@@ -18,7 +18,7 @@ import (
 	"net"
 
 	"github.com/Microsoft/hcsshim/hcn"
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 

pkg/ip/cidr.go

@@ -19,43 +19,87 @@ import (
 	"net"
 )
 
-// NextIP returns IP incremented by 1
+// NextIP returns IP incremented by 1, if IP is invalid, return nil
 func NextIP(ip net.IP) net.IP {
-	i := ipToInt(ip)
-	return intToIP(i.Add(i, big.NewInt(1)))
+	normalizedIP := normalizeIP(ip)
+	if normalizedIP == nil {
+		return nil
+	}
+
+	i := ipToInt(normalizedIP)
+	return intToIP(i.Add(i, big.NewInt(1)), len(normalizedIP) == net.IPv6len)
 }
 
-// PrevIP returns IP decremented by 1
+// PrevIP returns IP decremented by 1, if IP is invalid, return nil
 func PrevIP(ip net.IP) net.IP {
-	i := ipToInt(ip)
-	return intToIP(i.Sub(i, big.NewInt(1)))
+	normalizedIP := normalizeIP(ip)
+	if normalizedIP == nil {
+		return nil
+	}
+
+	i := ipToInt(normalizedIP)
+	return intToIP(i.Sub(i, big.NewInt(1)), len(normalizedIP) == net.IPv6len)
 }
 
 // Cmp compares two IPs, returning the usual ordering:
 // a < b : -1
 // a == b : 0
 // a > b : 1
+// incomparable : -2
 func Cmp(a, b net.IP) int {
-	aa := ipToInt(a)
-	bb := ipToInt(b)
-	return aa.Cmp(bb)
+	normalizedA := normalizeIP(a)
+	normalizedB := normalizeIP(b)
+
+	if len(normalizedA) == len(normalizedB) && len(normalizedA) != 0 {
+		return ipToInt(normalizedA).Cmp(ipToInt(normalizedB))
+	}
+
+	return -2
 }
 
 func ipToInt(ip net.IP) *big.Int {
-	if v := ip.To4(); v != nil {
-		return big.NewInt(0).SetBytes(v)
+	return big.NewInt(0).SetBytes(ip)
+}
+
+func intToIP(i *big.Int, isIPv6 bool) net.IP {
+	intBytes := i.Bytes()
+
+	if len(intBytes) == net.IPv4len || len(intBytes) == net.IPv6len {
+		return intBytes
 	}
-	return big.NewInt(0).SetBytes(ip.To16())
+
+	if isIPv6 {
+		return append(make([]byte, net.IPv6len-len(intBytes)), intBytes...)
+	}
+
+	return append(make([]byte, net.IPv4len-len(intBytes)), intBytes...)
 }
 
-func intToIP(i *big.Int) net.IP {
-	return net.IP(i.Bytes())
+// normalizeIP will normalize IP by family,
+// IPv4 : 4-byte form
+// IPv6 : 16-byte form
+// others : nil
+func normalizeIP(ip net.IP) net.IP {
+	if ipTo4 := ip.To4(); ipTo4 != nil {
+		return ipTo4
+	}
+	return ip.To16()
 }
 
-// Network masks off the host portion of the IP
+// Network masks off the host portion of the IP, if IPNet is invalid,
+// return nil
 func Network(ipn *net.IPNet) *net.IPNet {
+	if ipn == nil {
+		return nil
+	}
+
+	maskedIP := ipn.IP.Mask(ipn.Mask)
+	if maskedIP == nil {
+		return nil
+	}
+
 	return &net.IPNet{
-		IP:   ipn.IP.Mask(ipn.Mask),
+		IP:   maskedIP,
 		Mask: ipn.Mask,
 	}
 }

pkg/ip/cidr_test.go

@@ -0,0 +1,247 @@
+// Copyright 2022 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 ip
+
+import (
+	"net"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("CIDR functions", func() {
+	It("NextIP", func() {
+		testCases := []struct {
+			ip     net.IP
+			nextIP net.IP
+		}{
+			{
+				[]byte{192, 0, 2},
+				nil,
+			},
+			{
+				net.ParseIP("192.168.0.1"),
+				net.IPv4(192, 168, 0, 2).To4(),
+			},
+			{
+				net.ParseIP("192.168.0.255"),
+				net.IPv4(192, 168, 1, 0).To4(),
+			},
+			{
+				net.ParseIP("0.1.0.5"),
+				net.IPv4(0, 1, 0, 6).To4(),
+			},
+			{
+				net.ParseIP("AB12::123"),
+				net.ParseIP("AB12::124"),
+			},
+			{
+				net.ParseIP("AB12::FFFF"),
+				net.ParseIP("AB12::1:0"),
+			},
+			{
+				net.ParseIP("0::123"),
+				net.ParseIP("0::124"),
+			},
+		}
+
+		for _, test := range testCases {
+			ip := NextIP(test.ip)
+
+			Expect(ip).To(Equal(test.nextIP))
+		}
+	})
+
+	It("PrevIP", func() {
+		testCases := []struct {
+			ip     net.IP
+			prevIP net.IP
+		}{
+			{
+				[]byte{192, 0, 2},
+				nil,
+			},
+			{
+				net.ParseIP("192.168.0.2"),
+				net.IPv4(192, 168, 0, 1).To4(),
+			},
+			{
+				net.ParseIP("192.168.1.0"),
+				net.IPv4(192, 168, 0, 255).To4(),
+			},
+			{
+				net.ParseIP("0.1.0.5"),
+				net.IPv4(0, 1, 0, 4).To4(),
+			},
+			{
+				net.ParseIP("AB12::123"),
+				net.ParseIP("AB12::122"),
+			},
+			{
+				net.ParseIP("AB12::1:0"),
+				net.ParseIP("AB12::FFFF"),
+			},
+			{
+				net.ParseIP("0::124"),
+				net.ParseIP("0::123"),
+			},
+		}
+
+		for _, test := range testCases {
+			ip := PrevIP(test.ip)
+
+			Expect(ip).To(Equal(test.prevIP))
+		}
+	})
+
+	It("Cmp", func() {
+		testCases := []struct {
+			a      net.IP
+			b      net.IP
+			result int
+		}{
+			{
+				net.ParseIP("192.168.0.2"),
+				nil,
+				-2,
+			},
+			{
+				net.ParseIP("192.168.0.2"),
+				[]byte{192, 168, 5},
+				-2,
+			},
+			{
+				net.ParseIP("192.168.0.2"),
+				net.ParseIP("AB12::123"),
+				-2,
+			},
+			{
+				net.ParseIP("192.168.0.2"),
+				net.ParseIP("192.168.0.5"),
+				-1,
+			},
+			{
+				net.ParseIP("192.168.0.2"),
+				net.ParseIP("192.168.0.5").To4(),
+				-1,
+			},
+			{
+				net.ParseIP("192.168.0.10"),
+				net.ParseIP("192.168.0.5"),
+				1,
+			},
+			{
+				net.ParseIP("192.168.0.10"),
+				net.ParseIP("192.168.0.10"),
+				0,
+			},
+			{
+				net.ParseIP("192.168.0.10"),
+				net.ParseIP("192.168.0.10").To4(),
+				0,
+			},
+			{
+				net.ParseIP("AB12::122"),
+				net.ParseIP("AB12::123"),
+				-1,
+			},
+			{
+				net.ParseIP("AB12::210"),
+				net.ParseIP("AB12::123"),
+				1,
+			},
+			{
+				net.ParseIP("AB12::210"),
+				net.ParseIP("AB12::210"),
+				0,
+			},
+		}
+
+		for _, test := range testCases {
+			result := Cmp(test.a, test.b)
+
+			Expect(result).To(Equal(test.result))
+		}
+	})
+
+	It("Network", func() {
+		testCases := []struct {
+			ipNet  *net.IPNet
+			result *net.IPNet
+		}{
+			{
+				nil,
+				nil,
+			},
+			{
+				&net.IPNet{
+					IP:   nil,
+					Mask: net.IPv4Mask(255, 255, 255, 0),
+				},
+				nil,
+			},
+			{
+				&net.IPNet{
+					IP:   net.IPv4(192, 168, 0, 1),
+					Mask: nil,
+				},
+				nil,
+			},
+			{
+				&net.IPNet{
+					IP:   net.ParseIP("AB12::123"),
+					Mask: net.IPv4Mask(255, 255, 255, 0),
+				},
+				nil,
+			},
+			{
+				&net.IPNet{
+					IP:   net.IPv4(192, 168, 0, 100).To4(),
+					Mask: net.CIDRMask(120, 128),
+				},
+				&net.IPNet{
+					IP:   net.IPv4(192, 168, 0, 0).To4(),
+					Mask: net.CIDRMask(120, 128),
+				},
+			},
+			{
+				&net.IPNet{
+					IP:   net.IPv4(192, 168, 0, 100),
+					Mask: net.CIDRMask(24, 32),
+				},
+				&net.IPNet{
+					IP:   net.IPv4(192, 168, 0, 0).To4(),
+					Mask: net.CIDRMask(24, 32),
+				},
+			},
+			{
+				&net.IPNet{
+					IP:   net.ParseIP("AB12::123"),
+					Mask: net.CIDRMask(120, 128),
+				},
+				&net.IPNet{
+					IP:   net.ParseIP("AB12::100"),
+					Mask: net.CIDRMask(120, 128),
+				},
+			},
+		}
+
+		for _, test := range testCases {
+			result := Network(test.ipNet)
+
+			Expect(result).To(Equal(test.result))
+		}
+	})
+})

pkg/ip/ip.go

@@ -47,13 +47,12 @@ func ParseIP(s string) *IP {
 			return nil
 		}
 		return newIP(ip, ipNet.Mask)
-	} else {
-		ip := net.ParseIP(s)
-		if ip == nil {
-			return nil
-		}
-		return newIP(ip, nil)
 	}
+	ip := net.ParseIP(s)
+	if ip == nil {
+		return nil
+	}
+	return newIP(ip, nil)
 }
 
 // ToIP will return a net.IP in standard form from this IP.

pkg/ip/ip_suite_test.go

@@ -15,10 +15,10 @@
 package ip_test
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestIp(t *testing.T) {

pkg/ip/ip_test.go

@@ -19,7 +19,7 @@ import (
 	"fmt"
 	"net"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 
@@ -124,7 +124,7 @@ var _ = Describe("IP Operations", func() {
 		}
 
 		for _, test := range testCases {
-			Expect(len(test.ip.ToIP())).To(Equal(test.expectedLen))
+			Expect(test.ip.ToIP()).To(HaveLen(test.expectedLen))
 			Expect(test.ip.ToIP()).To(Equal(test.expectedIP))
 		}
 	})
@@ -174,8 +174,8 @@ var _ = Describe("IP Operations", func() {
 		}
 	})
 
-	It("Decode", func() {
-		Context("valid IP", func() {
+	Context("Decode", func() {
+		It("valid IP", func() {
 			testCases := []struct {
 				text     string
 				expected *IP
@@ -205,10 +205,9 @@ var _ = Describe("IP Operations", func() {
 				Expect(err).NotTo(HaveOccurred())
 				Expect(ip).To(Equal(test.expected))
 			}
-
 		})
 
-		Context("empty text", func() {
+		It("empty text", func() {
 			ip := &IP{}
 			err := json.Unmarshal([]byte(`""`), ip)
 
@@ -216,7 +215,7 @@ var _ = Describe("IP Operations", func() {
 			Expect(ip).To(Equal(newIP(nil, nil)))
 		})
 
-		Context("invalid IP", func() {
+		It("invalid IP", func() {
 			testCases := []struct {
 				text        string
 				expectedErr error
@@ -243,7 +242,7 @@ var _ = Describe("IP Operations", func() {
 			}
 		})
 
-		Context("IP slice", func() {
+		It("IP slice", func() {
 			testCases := []struct {
 				text     string
 				expected []*IP

pkg/ip/ipforward_linux.go

@@ -16,7 +16,7 @@ package ip
 
 import (
 	"bytes"
-	"io/ioutil"
+	"os"
 
 	current "github.com/containernetworking/cni/pkg/types/100"
 )
@@ -53,10 +53,10 @@ func EnableForward(ips []*current.IPConfig) error {
 }
 
 func echo1(f string) error {
-	if content, err := ioutil.ReadFile(f); err == nil {
+	if content, err := os.ReadFile(f); err == nil {
 		if bytes.Equal(bytes.TrimSpace(content), []byte("1")) {
 			return nil
 		}
 	}
-	return ioutil.WriteFile(f, []byte("1"), 0644)
+	return os.WriteFile(f, []byte("1"), 0o644)
 }

pkg/ip/ipforward_linux_test.go

@@ -1,17 +1,16 @@
 package ip
 
 import (
-	"io/ioutil"
 	"os"
 	"time"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 
 var _ = Describe("IpforwardLinux", func() {
 	It("echo1 must not write the file if content is 1", func() {
-		file, err := ioutil.TempFile(os.TempDir(), "containernetworking")
+		file, err := os.CreateTemp("", "containernetworking")
 		Expect(err).NotTo(HaveOccurred())
 		defer os.Remove(file.Name())
 		err = echo1(file.Name())

pkg/ip/ipmasq_linux.go

@@ -104,7 +104,6 @@ func TeardownIPMasq(ipn *net.IPNet, chain string, comment string) error {
 	err = ipt.ClearChain("nat", chain)
 	if err != nil && !isNotExist(err) {
 		return err
-
 	}
 
 	err = ipt.DeleteChain("nat", chain)

pkg/ip/link_linux.go

@@ -28,9 +28,7 @@ import (
 	"github.com/containernetworking/plugins/pkg/utils/sysctl"
 )
 
-var (
-	ErrLinkNotFound = errors.New("link not found")
-)
+var ErrLinkNotFound = errors.New("link not found")
 
 // makeVethPair is called from within the container's network namespace
 func makeVethPair(name, peer string, mtu int, mac string, hostNS ns.NetNS) (netlink.Link, error) {
@@ -69,38 +67,37 @@ func peerExists(name string) bool {
 	return true
 }
 
-func makeVeth(name, vethPeerName string, mtu int, mac string, hostNS ns.NetNS) (peerName string, veth netlink.Link, err error) {
+func makeVeth(name, vethPeerName string, mtu int, mac string, hostNS ns.NetNS) (string, netlink.Link, error) {
+	var peerName string
+	var veth netlink.Link
+	var err error
 	for i := 0; i < 10; i++ {
 		if vethPeerName != "" {
 			peerName = vethPeerName
 		} else {
 			peerName, err = RandomVethName()
 			if err != nil {
-				return
+				return peerName, nil, err
 			}
 		}
 
 		veth, err = makeVethPair(name, peerName, mtu, mac, hostNS)
 		switch {
 		case err == nil:
-			return
+			return peerName, veth, nil
 
 		case os.IsExist(err):
 			if peerExists(peerName) && vethPeerName == "" {
 				continue
 			}
-			err = fmt.Errorf("container veth name provided (%v) already exists", name)
-			return
-
+			return peerName, veth, fmt.Errorf("container veth name provided (%v) already exists", name)
 		default:
-			err = fmt.Errorf("failed to make veth pair: %v", err)
-			return
+			return peerName, veth, fmt.Errorf("failed to make veth pair: %v", err)
 		}
 	}
 
 	// should really never be hit
-	err = fmt.Errorf("failed to find a unique veth name")
-	return
+	return peerName, nil, fmt.Errorf("failed to find a unique veth name")
 }
 
 // RandomVethName returns string "veth" with random prefix (hashed from entropy)

pkg/ip/link_linux_test.go

@@ -20,22 +20,15 @@ import (
 	"fmt"
 	"net"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
 
 	"github.com/containernetworking/plugins/pkg/ip"
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
-
-	"github.com/vishvananda/netlink"
 )
 
-func getHwAddr(linkname string) string {
-	veth, err := netlink.LinkByName(linkname)
-	Expect(err).NotTo(HaveOccurred())
-	return fmt.Sprintf("%s", veth.Attrs().HardwareAddr)
-}
-
 var _ = Describe("Link", func() {
 	const (
 		ifaceFormatString string = "i%d"
@@ -64,7 +57,7 @@ var _ = Describe("Link", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		fakeBytes := make([]byte, 20)
-		//to be reset in AfterEach block
+		// to be reset in AfterEach block
 		rand.Reader = bytes.NewReader(fakeBytes)
 
 		_ = containerNetNS.Do(func(ns.NetNS) error {
@@ -181,7 +174,7 @@ var _ = Describe("Link", func() {
 
 	Context("when there is no name available for the host-side", func() {
 		BeforeEach(func() {
-			//adding different interface to container ns
+			// adding different interface to container ns
 			containerVethName += "0"
 		})
 		It("returns useful error", func() {
@@ -197,7 +190,7 @@ var _ = Describe("Link", func() {
 
 	Context("when there is no name conflict for the host or container interfaces", func() {
 		BeforeEach(func() {
-			//adding different interface to container and host ns
+			// adding different interface to container and host ns
 			containerVethName += "0"
 			rand.Reader = originalRandReader
 		})
@@ -211,7 +204,7 @@ var _ = Describe("Link", func() {
 				return nil
 			})
 
-			//verify veths are in different namespaces
+			// verify veths are in different namespaces
 			_ = containerNetNS.Do(func(ns.NetNS) error {
 				defer GinkgoRecover()
 
@@ -290,7 +283,7 @@ var _ = Describe("Link", func() {
 			// this will delete the host endpoint too
 			addr, err := ip.DelLinkByNameAddr(containerVethName)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(addr).To(HaveLen(0))
+			Expect(addr).To(BeEmpty())
 			return nil
 		})
 	})

pkg/ip/route_linux.go

@@ -42,6 +42,11 @@ func AddHostRoute(ipn *net.IPNet, gw net.IP, dev netlink.Link) error {
 
 // AddDefaultRoute sets the default route on the given gateway.
 func AddDefaultRoute(gw net.IP, dev netlink.Link) error {
-	_, defNet, _ := net.ParseCIDR("0.0.0.0/0")
+	var defNet *net.IPNet
+	if gw.To4() != nil {
+		_, defNet, _ = net.ParseCIDR("0.0.0.0/0")
+	} else {
+		_, defNet, _ = net.ParseCIDR("::/0")
+	}
 	return AddRoute(defNet, gw, dev)
 }

pkg/ip/utils_linux.go

@@ -21,13 +21,13 @@ import (
 	"fmt"
 	"net"
 
+	"github.com/vishvananda/netlink"
+
 	"github.com/containernetworking/cni/pkg/types"
 	current "github.com/containernetworking/cni/pkg/types/100"
-	"github.com/vishvananda/netlink"
 )
 
 func ValidateExpectedInterfaceIPs(ifName string, resultIPs []*current.IPConfig) error {
-
 	// Ensure ips
 	for _, ips := range resultIPs {
 		ourAddr := netlink.Addr{IPNet: &ips.Address}
@@ -49,12 +49,15 @@ func ValidateExpectedInterfaceIPs(ifName string, resultIPs []*current.IPConfig)
 				break
 			}
 		}
-		if match == false {
+		if !match {
 			return fmt.Errorf("Failed to match addr %v on interface %v", ourAddr, ifName)
 		}
 
 		// Convert the host/prefixlen to just prefix for route lookup.
 		_, ourPrefix, err := net.ParseCIDR(ourAddr.String())
+		if err != nil {
+			return err
+		}
 
 		findGwy := &netlink.Route{Dst: ourPrefix}
 		routeFilter := netlink.RT_FILTER_DST
@@ -77,11 +80,13 @@ func ValidateExpectedInterfaceIPs(ifName string, resultIPs []*current.IPConfig)
 }
 
 func ValidateExpectedRoute(resultRoutes []*types.Route) error {
-
 	// Ensure that each static route in prevResults is found in the routing table
 	for _, route := range resultRoutes {
 		find := &netlink.Route{Dst: &route.Dst, Gw: route.GW}
-		routeFilter := netlink.RT_FILTER_DST | netlink.RT_FILTER_GW
+		routeFilter := netlink.RT_FILTER_DST
+		if route.GW != nil {
+			routeFilter |= netlink.RT_FILTER_GW
+		}
 		var family int
 
 		switch {

pkg/ipam/ipam.go

@@ -16,6 +16,7 @@ package ipam
 
 import (
 	"context"
+
 	"github.com/containernetworking/cni/pkg/invoke"
 	"github.com/containernetworking/cni/pkg/types"
 )

pkg/ipam/ipam_linux.go

@@ -19,11 +19,11 @@ import (
 	"net"
 	"os"
 
+	"github.com/vishvananda/netlink"
+
 	current "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/plugins/pkg/ip"
 	"github.com/containernetworking/plugins/pkg/utils/sysctl"
-
-	"github.com/vishvananda/netlink"
 )
 
 const (
@@ -44,7 +44,7 @@ func ConfigureIface(ifName string, res *current.Result) error {
 	}
 
 	var v4gw, v6gw net.IP
-	var has_enabled_ipv6 bool = false
+	hasEnabledIpv6 := false
 	for _, ipc := range res.IPs {
 		if ipc.Interface == nil {
 			continue
@@ -57,7 +57,7 @@ func ConfigureIface(ifName string, res *current.Result) error {
 
 		// Make sure sysctl "disable_ipv6" is 0 if we are about to add
 		// an IPv6 address to the interface
-		if !has_enabled_ipv6 && ipc.Address.IP.To4() == nil {
+		if !hasEnabledIpv6 && ipc.Address.IP.To4() == nil {
 			// Enabled IPv6 for loopback "lo" and the interface
 			// being configured
 			for _, iface := range [2]string{"lo", ifName} {
@@ -79,7 +79,7 @@ func ConfigureIface(ifName string, res *current.Result) error {
 					return fmt.Errorf("failed to enable IPv6 for interface %q (%s=%s): %v", iface, ipv6SysctlValueName, value, err)
 				}
 			}
-			has_enabled_ipv6 = true
+			hasEnabledIpv6 = true
 		}
 
 		addr := &netlink.Addr{IPNet: &ipc.Address, Label: ""}

pkg/ipam/ipam_linux_test.go

@@ -18,15 +18,14 @@ import (
 	"net"
 	"syscall"
 
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
+
 	"github.com/containernetworking/cni/pkg/types"
 	current "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
-
-	"github.com/vishvananda/netlink"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
 )
 
 const LINK_NAME = "eth0"
@@ -143,12 +142,12 @@ var _ = Describe("ConfigureIface", func() {
 
 			v4addrs, err := netlink.AddrList(link, syscall.AF_INET)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(len(v4addrs)).To(Equal(1))
-			Expect(ipNetEqual(v4addrs[0].IPNet, ipv4)).To(Equal(true))
+			Expect(v4addrs).To(HaveLen(1))
+			Expect(ipNetEqual(v4addrs[0].IPNet, ipv4)).To(BeTrue())
 
 			v6addrs, err := netlink.AddrList(link, syscall.AF_INET6)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(len(v6addrs)).To(Equal(2))
+			Expect(v6addrs).To(HaveLen(2))
 
 			var found bool
 			for _, a := range v6addrs {
@@ -157,7 +156,7 @@ var _ = Describe("ConfigureIface", func() {
 					break
 				}
 			}
-			Expect(found).To(Equal(true))
+			Expect(found).To(BeTrue())
 
 			// Ensure the v4 route, v6 route, and subnet route
 			routes, err := netlink.RouteList(link, 0)
@@ -177,8 +176,8 @@ var _ = Describe("ConfigureIface", func() {
 					break
 				}
 			}
-			Expect(v4found).To(Equal(true))
-			Expect(v6found).To(Equal(true))
+			Expect(v4found).To(BeTrue())
+			Expect(v6found).To(BeTrue())
 
 			return nil
 		})
@@ -216,8 +215,8 @@ var _ = Describe("ConfigureIface", func() {
 					break
 				}
 			}
-			Expect(v4found).To(Equal(true))
-			Expect(v6found).To(Equal(true))
+			Expect(v4found).To(BeTrue())
+			Expect(v6found).To(BeTrue())
 
 			return nil
 		})

pkg/ipam/ipam_suite_test.go

@@ -15,10 +15,10 @@
 package ipam_test
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestIpam(t *testing.T) {

pkg/link/link_suite_test.go

@@ -17,7 +17,7 @@ package link_test
 import (
 	"testing"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 

pkg/link/spoofcheck.go

@@ -15,8 +15,10 @@
 package link
 
 import (
+	"context"
 	"fmt"
 	"os"
+	"time"
 
 	"github.com/networkplumbing/go-nft/nft"
 	"github.com/networkplumbing/go-nft/nft/schema"
@@ -28,8 +30,8 @@ const (
 )
 
 type NftConfigurer interface {
-	Apply(*nft.Config) error
-	Read() (*nft.Config, error)
+	Apply(*nft.Config) (*nft.Config, error)
+	Read(filterCommands ...string) (*nft.Config, error)
 }
 
 type SpoofChecker struct {
@@ -37,16 +39,23 @@ type SpoofChecker struct {
 	macAddress string
 	refID      string
 	configurer NftConfigurer
+	rulestore  *nft.Config
 }
 
 type defaultNftConfigurer struct{}
 
-func (_ defaultNftConfigurer) Apply(cfg *nft.Config) error {
-	return nft.ApplyConfig(cfg)
+func (dnc defaultNftConfigurer) Apply(cfg *nft.Config) (*nft.Config, error) {
+	const timeout = 55 * time.Second
+	ctxWithTimeout, cancelFunc := context.WithTimeout(context.Background(), timeout)
+	defer cancelFunc()
+	return nft.ApplyConfigEcho(ctxWithTimeout, cfg)
 }
 
-func (_ defaultNftConfigurer) Read() (*nft.Config, error) {
-	return nft.ReadConfig()
+func (dnc defaultNftConfigurer) Read(filterCommands ...string) (*nft.Config, error) {
+	const timeout = 55 * time.Second
+	ctxWithTimeout, cancelFunc := context.WithTimeout(context.Background(), timeout)
+	defer cancelFunc()
+	return nft.ReadConfigContext(ctxWithTimeout, filterCommands...)
 }
 
 func NewSpoofChecker(iface, macAddress, refID string) *SpoofChecker {
@@ -54,7 +63,7 @@ func NewSpoofChecker(iface, macAddress, refID string) *SpoofChecker {
 }
 
 func NewSpoofCheckerWithConfigurer(iface, macAddress, refID string, configurer NftConfigurer) *SpoofChecker {
-	return &SpoofChecker{iface, macAddress, refID, configurer}
+	return &SpoofChecker{iface, macAddress, refID, configurer, nil}
 }
 
 // Setup applies nftables configuration to restrict traffic
@@ -83,7 +92,7 @@ func (sc *SpoofChecker) Setup() error {
 	macChain := sc.macChain(ifaceChain.Name)
 	baseConfig.AddChain(macChain)
 
-	if err := sc.configurer.Apply(baseConfig); err != nil {
+	if _, err := sc.configurer.Apply(baseConfig); err != nil {
 		return fmt.Errorf("failed to setup spoof-check: %v", err)
 	}
 
@@ -97,37 +106,51 @@ func (sc *SpoofChecker) Setup() error {
 	rulesConfig.AddRule(sc.matchMacRule(macChain.Name))
 	rulesConfig.AddRule(sc.dropRule(macChain.Name))
 
-	if err := sc.configurer.Apply(rulesConfig); err != nil {
+	rulestore, err := sc.configurer.Apply(rulesConfig)
+	if err != nil {
 		return fmt.Errorf("failed to setup spoof-check: %v", err)
 	}
+	sc.rulestore = rulestore
 
 	return nil
 }
 
+func (sc *SpoofChecker) findPreroutingRule(ruleToFind *schema.Rule) ([]*schema.Rule, error) {
+	ruleset := sc.rulestore
+	if ruleset == nil {
+		chain, err := sc.configurer.Read(listChainBridgeNatPrerouting()...)
+		if err != nil {
+			return nil, err
+		}
+		ruleset = chain
+	}
+	return ruleset.LookupRule(ruleToFind), nil
+}
+
 // Teardown removes the interface and mac-address specific chains and their rules.
 // The table and base-chain are expected to survive while the base-chain rule that matches the
 // interface is removed.
 func (sc *SpoofChecker) Teardown() error {
 	ifaceChain := sc.ifaceChain()
-	currentConfig, ifaceMatchRuleErr := sc.configurer.Read()
-	if ifaceMatchRuleErr == nil {
-		expectedRuleToFind := sc.matchIfaceJumpToChainRule(preRoutingBaseChainName, ifaceChain.Name)
-		// It is safer to exclude the statement matching, avoiding cases where a current statement includes
-		// additional default entries (e.g. counters).
-		ruleToFindExcludingStatements := *expectedRuleToFind
-		ruleToFindExcludingStatements.Expr = nil
-		rules := currentConfig.LookupRule(&ruleToFindExcludingStatements)
-		if len(rules) > 0 {
-			c := nft.NewConfig()
-			for _, rule := range rules {
-				c.DeleteRule(rule)
-			}
-			if err := sc.configurer.Apply(c); err != nil {
-				ifaceMatchRuleErr = fmt.Errorf("failed to delete iface match rule: %v", err)
-			}
-		} else {
-			fmt.Fprintf(os.Stderr, "spoofcheck/teardown: unable to detect iface match rule for deletion: %+v", expectedRuleToFind)
+	expectedRuleToFind := sc.matchIfaceJumpToChainRule(preRoutingBaseChainName, ifaceChain.Name)
+	// It is safer to exclude the statement matching, avoiding cases where a current statement includes
+	// additional default entries (e.g. counters).
+	ruleToFindExcludingStatements := *expectedRuleToFind
+	ruleToFindExcludingStatements.Expr = nil
+
+	rules, ifaceMatchRuleErr := sc.findPreroutingRule(&ruleToFindExcludingStatements)
+	if ifaceMatchRuleErr == nil && len(rules) > 0 {
+		c := nft.NewConfig()
+		for _, rule := range rules {
+			c.DeleteRule(rule)
 		}
+		if _, err := sc.configurer.Apply(c); err != nil {
+			ifaceMatchRuleErr = fmt.Errorf("failed to delete iface match rule: %v", err)
+		}
+		// Drop the cache, it should contain deleted rule(s) now
+		sc.rulestore = nil
+	} else {
+		fmt.Fprintf(os.Stderr, "spoofcheck/teardown: unable to detect iface match rule for deletion: %+v", expectedRuleToFind)
 	}
 
 	regularChainsConfig := nft.NewConfig()
@@ -135,7 +158,7 @@ func (sc *SpoofChecker) Teardown() error {
 	regularChainsConfig.DeleteChain(sc.macChain(ifaceChain.Name))
 
 	var regularChainsErr error
-	if err := sc.configurer.Apply(regularChainsConfig); err != nil {
+	if _, err := sc.configurer.Apply(regularChainsConfig); err != nil {
 		regularChainsErr = fmt.Errorf("failed to delete regular chains: %v", err)
 	}
 
@@ -195,12 +218,10 @@ func (sc *SpoofChecker) matchMacRule(chain string) *schema.Rule {
 }
 
 func (sc *SpoofChecker) dropRule(chain string) *schema.Rule {
-	macRulesIndex := nft.NewRuleIndex()
 	return &schema.Rule{
 		Family: schema.FamilyBridge,
 		Table:  natTableName,
 		Chain:  chain,
-		Index:  macRulesIndex.Next(),
 		Expr: []schema.Statement{
 			{Verdict: schema.Verdict{SimpleVerdict: schema.SimpleVerdict{Drop: true}}},
 		},
@@ -208,7 +229,7 @@ func (sc *SpoofChecker) dropRule(chain string) *schema.Rule {
 	}
 }
 
-func (_ *SpoofChecker) baseChain() *schema.Chain {
+func (sc *SpoofChecker) baseChain() *schema.Chain {
 	chainPriority := -300
 	return &schema.Chain{
 		Family: schema.FamilyBridge,
@@ -230,7 +251,7 @@ func (sc *SpoofChecker) ifaceChain() *schema.Chain {
 	}
 }
 
-func (_ *SpoofChecker) macChain(ifaceChainName string) *schema.Chain {
+func (sc *SpoofChecker) macChain(ifaceChainName string) *schema.Chain {
 	macChainName := ifaceChainName + "-mac"
 	return &schema.Chain{
 		Family: schema.FamilyBridge,
@@ -243,3 +264,7 @@ func ruleComment(id string) string {
 	const refIDPrefix = "macspoofchk-"
 	return refIDPrefix + id
 }
+
+func listChainBridgeNatPrerouting() []string {
+	return []string{"chain", "bridge", natTableName, preRoutingBaseChainName}
+}

pkg/link/spoofcheck_test.go

@@ -16,9 +16,9 @@ package link_test
 
 import (
 	"fmt"
-	"github.com/networkplumbing/go-nft/nft"
 
-	. "github.com/onsi/ginkgo"
+	"github.com/networkplumbing/go-nft/nft"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 
 	"github.com/containernetworking/plugins/pkg/link"
@@ -113,13 +113,32 @@ var _ = Describe("spoofcheck", func() {
 			)))
 		})
 	})
+
+	Context("echo", func() {
+		It("succeeds, no read called", func() {
+			c := configurerStub{}
+			sc := link.NewSpoofCheckerWithConfigurer(iface, mac, id, &c)
+			Expect(sc.Setup()).To(Succeed())
+			Expect(sc.Teardown()).To(Succeed())
+			Expect(c.readCalled).To(BeFalse())
+		})
+
+		It("succeeds, fall back to config read", func() {
+			c := configurerStub{applyReturnNil: true}
+			sc := link.NewSpoofCheckerWithConfigurer(iface, mac, id, &c)
+			Expect(sc.Setup()).To(Succeed())
+			c.readConfig = c.applyConfig[0]
+			Expect(sc.Teardown()).To(Succeed())
+			Expect(c.readCalled).To(BeTrue())
+		})
+	})
 })
 
 func assertExpectedRegularChainsDeletionInTeardownConfig(action configurerStub) {
-	deleteRegularChainRulesJsonConfig, err := action.applyConfig[1].ToJSON()
+	deleteRegularChainRulesJSONConfig, err := action.applyConfig[1].ToJSON()
 	ExpectWithOffset(1, err).NotTo(HaveOccurred())
 
-	expectedDeleteRegularChainRulesJsonConfig := `
+	expectedDeleteRegularChainRulesJSONConfig := `
 			{"nftables": [
 				{"delete": {"chain": {
 					"family": "bridge",
@@ -133,14 +152,14 @@ func assertExpectedRegularChainsDeletionInTeardownConfig(action configurerStub)
 				}}}
 			]}`
 
-	ExpectWithOffset(1, string(deleteRegularChainRulesJsonConfig)).To(MatchJSON(expectedDeleteRegularChainRulesJsonConfig))
+	ExpectWithOffset(1, string(deleteRegularChainRulesJSONConfig)).To(MatchJSON(expectedDeleteRegularChainRulesJSONConfig))
 }
 
 func assertExpectedBaseChainRuleDeletionInTeardownConfig(action configurerStub) {
-	deleteBaseChainRuleJsonConfig, err := action.applyConfig[0].ToJSON()
+	deleteBaseChainRuleJSONConfig, err := action.applyConfig[0].ToJSON()
 	Expect(err).NotTo(HaveOccurred())
 
-	expectedDeleteIfaceMatchRuleJsonConfig := `
+	expectedDeleteIfaceMatchRuleJSONConfig := `
             {"nftables": [
 				{"delete": {"rule": {
 					"family": "bridge",
@@ -157,7 +176,7 @@ func assertExpectedBaseChainRuleDeletionInTeardownConfig(action configurerStub)
 					"comment": "macspoofchk-container99-net1"
 				}}}
 			]}`
-	Expect(string(deleteBaseChainRuleJsonConfig)).To(MatchJSON(expectedDeleteIfaceMatchRuleJsonConfig))
+	Expect(string(deleteBaseChainRuleJSONConfig)).To(MatchJSON(expectedDeleteIfaceMatchRuleJSONConfig))
 }
 
 func rowConfigWithRulesOnly() string {
@@ -254,7 +273,6 @@ func assertExpectedRulesInSetupConfig(c configurerStub) {
                     "comment":"macspoofchk-container99-net1"}},
                 {"rule":{"family":"bridge","table":"nat","chain":"cni-br-iface-container99-net1-mac",
                     "expr":[{"drop":null}],
-                    "index":0,
                     "comment":"macspoofchk-container99-net1"}}
             ]}`
 	ExpectWithOffset(1, string(jsonConfig)).To(MatchJSON(expectedConfig))
@@ -275,21 +293,28 @@ type configurerStub struct {
 	failFirstApplyConfig  bool
 	failSecondApplyConfig bool
 	failReadConfig        bool
+
+	applyReturnNil bool
+	readCalled     bool
 }
 
-func (a *configurerStub) Apply(c *nft.Config) error {
+func (a *configurerStub) Apply(c *nft.Config) (*nft.Config, error) {
 	a.applyCounter++
 	if a.failFirstApplyConfig && a.applyCounter == 1 {
-		return fmt.Errorf(errorFirstApplyText)
+		return nil, fmt.Errorf(errorFirstApplyText)
 	}
 	if a.failSecondApplyConfig && a.applyCounter == 2 {
-		return fmt.Errorf(errorSecondApplyText)
+		return nil, fmt.Errorf(errorSecondApplyText)
 	}
 	a.applyConfig = append(a.applyConfig, c)
-	return nil
+	if a.applyReturnNil {
+		return nil, nil
+	}
+	return c, nil
 }
 
-func (a *configurerStub) Read() (*nft.Config, error) {
+func (a *configurerStub) Read(_ ...string) (*nft.Config, error) {
+	a.readCalled = true
 	if a.failReadConfig {
 		return nil, fmt.Errorf(errorReadText)
 	}

pkg/ns/ns_linux_test.go

@@ -17,16 +17,16 @@ package ns_test
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sync"
 
-	"github.com/containernetworking/plugins/pkg/ns"
-	"github.com/containernetworking/plugins/pkg/testutils"
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 	"golang.org/x/sys/unix"
+
+	"github.com/containernetworking/plugins/pkg/ns"
+	"github.com/containernetworking/plugins/pkg/testutils"
 )
 
 func getInodeCurNetNS() (uint64, error) {
@@ -182,7 +182,7 @@ var _ = Describe("Linux namespace operations", func() {
 				testNsInode, err := getInodeNS(targetNetNS)
 				Expect(err).NotTo(HaveOccurred())
 
-				Expect(testNsInode).NotTo(Equal(0))
+				Expect(testNsInode).NotTo(Equal(uint64(0)))
 				Expect(testNsInode).NotTo(Equal(origNSInode))
 			})
 
@@ -208,7 +208,7 @@ var _ = Describe("Linux namespace operations", func() {
 			})
 
 			It("fails when the path is not a namespace", func() {
-				tempFile, err := ioutil.TempFile("", "nstest")
+				tempFile, err := os.CreateTemp("", "nstest")
 				Expect(err).NotTo(HaveOccurred())
 				defer tempFile.Close()
 
@@ -262,7 +262,7 @@ var _ = Describe("Linux namespace operations", func() {
 		})
 
 		It("should refuse other paths", func() {
-			tempFile, err := ioutil.TempFile("", "nstest")
+			tempFile, err := os.CreateTemp("", "nstest")
 			Expect(err).NotTo(HaveOccurred())
 			defer tempFile.Close()
 

pkg/ns/ns_suite_test.go

@@ -15,18 +15,14 @@
 package ns_test
 
 import (
-	"math/rand"
 	"runtime"
-
-	. "github.com/onsi/ginkgo"
-	"github.com/onsi/ginkgo/config"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestNs(t *testing.T) {
-	rand.Seed(config.GinkgoConfig.RandomSeed)
 	runtime.LockOSThread()
 
 	RegisterFailHandler(Fail)

pkg/testutils/bad_reader.go

@@ -21,7 +21,7 @@ type BadReader struct {
 	Error error
 }
 
-func (r *BadReader) Read(buffer []byte) (int, error) {
+func (r *BadReader) Read(_ []byte) (int, error) {
 	if r.Error != nil {
 		return 0, r.Error
 	}

pkg/testutils/cmd.go

@@ -15,7 +15,7 @@
 package testutils
 
 import (
-	"io/ioutil"
+	"io"
 	"os"
 
 	"github.com/containernetworking/cni/pkg/skel"
@@ -29,6 +29,7 @@ func envCleanup() {
 	os.Unsetenv("CNI_NETNS")
 	os.Unsetenv("CNI_IFNAME")
 	os.Unsetenv("CNI_CONTAINERID")
+	os.Unsetenv("CNI_NETNS_OVERRIDE")
 }
 
 func CmdAdd(cniNetns, cniContainerID, cniIfname string, conf []byte, f func() error) (types.Result, []byte, error) {
@@ -37,6 +38,7 @@ func CmdAdd(cniNetns, cniContainerID, cniIfname string, conf []byte, f func() er
 	os.Setenv("CNI_NETNS", cniNetns)
 	os.Setenv("CNI_IFNAME", cniIfname)
 	os.Setenv("CNI_CONTAINERID", cniContainerID)
+	os.Setenv("CNI_NETNS_OVERRIDE", "1")
 	defer envCleanup()
 
 	// Redirect stdout to capture plugin result
@@ -52,7 +54,7 @@ func CmdAdd(cniNetns, cniContainerID, cniIfname string, conf []byte, f func() er
 
 	var out []byte
 	if err == nil {
-		out, err = ioutil.ReadAll(r)
+		out, err = io.ReadAll(r)
 	}
 	os.Stdout = oldStdout
 
@@ -81,19 +83,20 @@ func CmdAddWithArgs(args *skel.CmdArgs, f func() error) (types.Result, []byte, e
 	return CmdAdd(args.Netns, args.ContainerID, args.IfName, args.StdinData, f)
 }
 
-func CmdCheck(cniNetns, cniContainerID, cniIfname string, conf []byte, f func() error) error {
+func CmdCheck(cniNetns, cniContainerID, cniIfname string, f func() error) error {
 	os.Setenv("CNI_COMMAND", "CHECK")
 	os.Setenv("CNI_PATH", os.Getenv("PATH"))
 	os.Setenv("CNI_NETNS", cniNetns)
 	os.Setenv("CNI_IFNAME", cniIfname)
 	os.Setenv("CNI_CONTAINERID", cniContainerID)
+	os.Setenv("CNI_NETNS_OVERRIDE", "1")
 	defer envCleanup()
 
 	return f()
 }
 
 func CmdCheckWithArgs(args *skel.CmdArgs, f func() error) error {
-	return CmdCheck(args.Netns, args.ContainerID, args.IfName, args.StdinData, f)
+	return CmdCheck(args.Netns, args.ContainerID, args.IfName, f)
 }
 
 func CmdDel(cniNetns, cniContainerID, cniIfname string, f func() error) error {
@@ -102,6 +105,7 @@ func CmdDel(cniNetns, cniContainerID, cniIfname string, f func() error) error {
 	os.Setenv("CNI_NETNS", cniNetns)
 	os.Setenv("CNI_IFNAME", cniIfname)
 	os.Setenv("CNI_CONTAINERID", cniContainerID)
+	os.Setenv("CNI_NETNS_OVERRIDE", "1")
 	defer envCleanup()
 
 	return f()

pkg/testutils/dns.go

@@ -16,7 +16,6 @@ package testutils
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -28,7 +27,7 @@ import (
 // an error if any occurs while creating/writing the file. It is the caller's
 // responsibility to remove the file.
 func TmpResolvConf(dnsConf types.DNS) (string, error) {
-	f, err := ioutil.TempFile("", "cni_test_resolv.conf")
+	f, err := os.CreateTemp("", "cni_test_resolv.conf")
 	if err != nil {
 		return "", fmt.Errorf("failed to get temp file for CNI test resolv.conf: %v", err)
 	}

pkg/testutils/echo/echo_test.go

@@ -2,12 +2,12 @@ package main_test
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"os/exec"
 	"strings"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 	"github.com/onsi/gomega/gbytes"
 	"github.com/onsi/gomega/gexec"
@@ -74,7 +74,7 @@ var _ = Describe("Echosvr", func() {
 			defer conn.Close()
 
 			fmt.Fprintf(conn, "hello\n")
-			Expect(ioutil.ReadAll(conn)).To(Equal([]byte("hello")))
+			Expect(io.ReadAll(conn)).To(Equal([]byte("hello")))
 		})
 	})
 
@@ -86,7 +86,7 @@ var _ = Describe("Echosvr", func() {
 		It("connects successfully using echo client", func() {
 			Eventually(session.Out).Should(gbytes.Say("\n"))
 			serverAddress := strings.TrimSpace(string(session.Out.Contents()))
-			fmt.Println("Server address", string(serverAddress))
+			fmt.Println("Server address", serverAddress)
 
 			cmd := exec.Command(clientBinaryPath, "-target", serverAddress, "-message", "hello")
 			clientSession, err := gexec.Start(cmd, GinkgoWriter, GinkgoWriter)

pkg/testutils/echo/init_test.go

@@ -1,10 +1,10 @@
 package main_test
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestEchosvr(t *testing.T) {

pkg/testutils/echo/server/main.go

@@ -1,9 +1,10 @@
 // Echosvr is a simple TCP echo server
 //
 // It prints its listen address on stdout
-//    127.0.0.1:xxxxx
-//  A test should wait for this line, parse it
-//  and may then attempt to connect.
+//
+//	  127.0.0.1:xxxxx
+//	A test should wait for this line, parse it
+//	and may then attempt to connect.
 package main
 
 import (
@@ -43,11 +44,13 @@ func main() {
 	// Start UDP server
 	addr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%s", port))
 	if err != nil {
-		log.Fatalf("Error from net.ResolveUDPAddr(): %s", err)
+		log.Printf("Error from net.ResolveUDPAddr(): %s", err)
+		return
 	}
 	sock, err := net.ListenUDP("udp", addr)
 	if err != nil {
-		log.Fatalf("Error from ListenUDP(): %s", err)
+		log.Printf("Error from ListenUDP(): %s", err)
+		return
 	}
 	defer sock.Close()
 
@@ -55,10 +58,11 @@ func main() {
 	for {
 		n, addr, err := sock.ReadFrom(buffer)
 		if err != nil {
-			log.Fatalf("Error from ReadFrom(): %s", err)
+			log.Printf("Error from ReadFrom(): %s", err)
+			return
 		}
 		sock.SetWriteDeadline(time.Now().Add(1 * time.Minute))
-		n, err = sock.WriteTo(buffer[0:n], addr)
+		_, err = sock.WriteTo(buffer[0:n], addr)
 		if err != nil {
 			return
 		}

pkg/testutils/netns_linux.go

@@ -24,8 +24,9 @@ import (
 	"sync"
 	"syscall"
 
-	"github.com/containernetworking/plugins/pkg/ns"
 	"golang.org/x/sys/unix"
+
+	"github.com/containernetworking/plugins/pkg/ns"
 )
 
 func getNsRunDir() string {
@@ -49,7 +50,6 @@ func getNsRunDir() string {
 // Creates a new persistent (bind-mounted) network namespace and returns an object
 // representing that namespace, without switching to it.
 func NewNS() (ns.NetNS, error) {
-
 	nsRunDir := getNsRunDir()
 
 	b := make([]byte, 16)
@@ -61,7 +61,7 @@ func NewNS() (ns.NetNS, error) {
 	// Create the directory for mounting network namespaces
 	// This needs to be a shared mountpoint in case it is mounted in to
 	// other namespaces (containers)
-	err = os.MkdirAll(nsRunDir, 0755)
+	err = os.MkdirAll(nsRunDir, 0o755)
 	if err != nil {
 		return nil, err
 	}

pkg/utils/iptables.go

@@ -29,9 +29,9 @@ func EnsureChain(ipt *iptables.IPTables, table, chain string) error {
 	if ipt == nil {
 		return errors.New("failed to ensure iptable chain: IPTables was nil")
 	}
-	exists, err := ChainExists(ipt, table, chain)
+	exists, err := ipt.ChainExists(table, chain)
 	if err != nil {
-		return fmt.Errorf("failed to list iptables chains: %v", err)
+		return fmt.Errorf("failed to check iptables chain existence: %v", err)
 	}
 	if !exists {
 		err = ipt.NewChain(table, chain)
@@ -45,24 +45,6 @@ func EnsureChain(ipt *iptables.IPTables, table, chain string) error {
 	return nil
 }
 
-// ChainExists checks whether an iptables chain exists.
-func ChainExists(ipt *iptables.IPTables, table, chain string) (bool, error) {
-	if ipt == nil {
-		return false, errors.New("failed to check iptable chain: IPTables was nil")
-	}
-	chains, err := ipt.ListChains(table)
-	if err != nil {
-		return false, err
-	}
-
-	for _, ch := range chains {
-		if ch == chain {
-			return true, nil
-		}
-	}
-	return false, nil
-}
-
 // DeleteRule idempotently delete the iptables rule in the specified table/chain.
 // It does not return an error if the referring chain doesn't exist
 func DeleteRule(ipt *iptables.IPTables, table, chain string, rulespec ...string) error {
@@ -133,7 +115,6 @@ func InsertUnique(ipt *iptables.IPTables, table, chain string, prepend bool, rul
 
 	if prepend {
 		return ipt.Insert(table, chain, 1, rule...)
-	} else {
-		return ipt.Append(table, chain, rule...)
 	}
+	return ipt.Append(table, chain, rule...)
 }

pkg/utils/iptables_test.go

@@ -19,11 +19,12 @@ import (
 	"math/rand"
 	"runtime"
 
+	"github.com/coreos/go-iptables/iptables"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
-	"github.com/coreos/go-iptables/iptables"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
 )
 
 const TABLE = "filter" // We'll monkey around here
@@ -34,7 +35,6 @@ var _ = Describe("chain tests", func() {
 	var cleanup func()
 
 	BeforeEach(func() {
-
 		// Save a reference to the original namespace,
 		// Add a new NS
 		currNs, err := ns.GetCurrentNS()
@@ -60,7 +60,6 @@ var _ = Describe("chain tests", func() {
 			ipt.DeleteChain(TABLE, testChain)
 			currNs.Set()
 		}
-
 	})
 
 	AfterEach(func() {
@@ -93,5 +92,4 @@ var _ = Describe("chain tests", func() {
 			Expect(err).NotTo(HaveOccurred())
 		})
 	})
-
 })

pkg/utils/sysctl/sysctl_linux.go

@@ -16,7 +16,7 @@ package sysctl
 
 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strings"
 )
@@ -36,7 +36,7 @@ func Sysctl(name string, params ...string) (string, error) {
 
 func getSysctl(name string) (string, error) {
 	fullName := filepath.Join("/proc/sys", toNormalName(name))
-	data, err := ioutil.ReadFile(fullName)
+	data, err := os.ReadFile(fullName)
 	if err != nil {
 		return "", err
 	}
@@ -46,7 +46,7 @@ func getSysctl(name string) (string, error) {
 
 func setSysctl(name, value string) (string, error) {
 	fullName := filepath.Join("/proc/sys", toNormalName(name))
-	if err := ioutil.WriteFile(fullName, []byte(value), 0644); err != nil {
+	if err := os.WriteFile(fullName, []byte(value), 0o644); err != nil {
 		return "", err
 	}
 

pkg/utils/sysctl/sysctl_linux_test.go

@@ -20,12 +20,13 @@ import (
 	"runtime"
 	"strings"
 
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
+
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
 	"github.com/containernetworking/plugins/pkg/utils/sysctl"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-	"github.com/vishvananda/netlink"
 )
 
 const (
@@ -37,8 +38,7 @@ var _ = Describe("Sysctl tests", func() {
 	var testIfaceName string
 	var cleanup func()
 
-	BeforeEach(func() {
-
+	beforeEach := func() {
 		// Save a reference to the original namespace,
 		// Add a new NS
 		currNs, err := ns.GetCurrentNS()
@@ -66,8 +66,7 @@ var _ = Describe("Sysctl tests", func() {
 			netlink.LinkDel(testIface)
 			currNs.Set()
 		}
-
-	})
+	}
 
 	AfterEach(func() {
 		cleanup()
@@ -75,7 +74,8 @@ var _ = Describe("Sysctl tests", func() {
 
 	Describe("Sysctl", func() {
 		It("reads keys with dot separators", func() {
-			sysctlIfaceName := strings.Replace(testIfaceName, ".", "/", -1)
+			beforeEach()
+			sysctlIfaceName := strings.ReplaceAll(testIfaceName, ".", "/")
 			sysctlKey := fmt.Sprintf(sysctlDotKeyTemplate, sysctlIfaceName)
 
 			_, err := sysctl.Sysctl(sysctlKey)
@@ -85,6 +85,7 @@ var _ = Describe("Sysctl tests", func() {
 
 	Describe("Sysctl", func() {
 		It("reads keys with slash separators", func() {
+			beforeEach()
 			sysctlKey := fmt.Sprintf(sysctlSlashKeyTemplate, testIfaceName)
 
 			_, err := sysctl.Sysctl(sysctlKey)
@@ -94,7 +95,8 @@ var _ = Describe("Sysctl tests", func() {
 
 	Describe("Sysctl", func() {
 		It("writes keys with dot separators", func() {
-			sysctlIfaceName := strings.Replace(testIfaceName, ".", "/", -1)
+			beforeEach()
+			sysctlIfaceName := strings.ReplaceAll(testIfaceName, ".", "/")
 			sysctlKey := fmt.Sprintf(sysctlDotKeyTemplate, sysctlIfaceName)
 
 			_, err := sysctl.Sysctl(sysctlKey, "1")
@@ -104,11 +106,11 @@ var _ = Describe("Sysctl tests", func() {
 
 	Describe("Sysctl", func() {
 		It("writes keys with slash separators", func() {
+			beforeEach()
 			sysctlKey := fmt.Sprintf(sysctlSlashKeyTemplate, testIfaceName)
 
 			_, err := sysctl.Sysctl(sysctlKey, "1")
 			Expect(err).NotTo(HaveOccurred())
 		})
 	})
-
 })

pkg/utils/sysctl/sysctl_suite_test.go

@@ -17,7 +17,7 @@ package sysctl_test
 import (
 	"testing"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 

pkg/utils/utils_suite_test.go

@@ -15,10 +15,10 @@
 package utils_test
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestUtils(t *testing.T) {

pkg/utils/utils_test.go

@@ -18,7 +18,7 @@ import (
 	"fmt"
 	"strings"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 
@@ -26,29 +26,29 @@ var _ = Describe("Utils", func() {
 	Describe("FormatChainName", func() {
 		It("must format a short name", func() {
 			chain := FormatChainName("test", "1234")
-			Expect(len(chain)).To(Equal(maxChainLength))
+			Expect(chain).To(HaveLen(maxChainLength))
 			Expect(chain).To(Equal("CNI-2bbe0c48b91a7d1b8a6753a8"))
 		})
 
 		It("must truncate a long name", func() {
 			chain := FormatChainName("testalongnamethatdoesnotmakesense", "1234")
-			Expect(len(chain)).To(Equal(maxChainLength))
+			Expect(chain).To(HaveLen(maxChainLength))
 			Expect(chain).To(Equal("CNI-374f33fe84ab0ed84dcdebe3"))
 		})
 
 		It("must be predictable", func() {
 			chain1 := FormatChainName("testalongnamethatdoesnotmakesense", "1234")
 			chain2 := FormatChainName("testalongnamethatdoesnotmakesense", "1234")
-			Expect(len(chain1)).To(Equal(maxChainLength))
-			Expect(len(chain2)).To(Equal(maxChainLength))
+			Expect(chain1).To(HaveLen(maxChainLength))
+			Expect(chain2).To(HaveLen(maxChainLength))
 			Expect(chain1).To(Equal(chain2))
 		})
 
 		It("must change when a character changes", func() {
 			chain1 := FormatChainName("testalongnamethatdoesnotmakesense", "1234")
 			chain2 := FormatChainName("testalongnamethatdoesnotmakesense", "1235")
-			Expect(len(chain1)).To(Equal(maxChainLength))
-			Expect(len(chain2)).To(Equal(maxChainLength))
+			Expect(chain1).To(HaveLen(maxChainLength))
+			Expect(chain2).To(HaveLen(maxChainLength))
 			Expect(chain1).To(Equal("CNI-374f33fe84ab0ed84dcdebe3"))
 			Expect(chain1).NotTo(Equal(chain2))
 		})
@@ -57,35 +57,35 @@ var _ = Describe("Utils", func() {
 	Describe("MustFormatChainNameWithPrefix", func() {
 		It("generates a chain name with a prefix", func() {
 			chain := MustFormatChainNameWithPrefix("test", "1234", "PREFIX-")
-			Expect(len(chain)).To(Equal(maxChainLength))
+			Expect(chain).To(HaveLen(maxChainLength))
 			Expect(chain).To(Equal("CNI-PREFIX-2bbe0c48b91a7d1b8"))
 		})
 
 		It("must format a short name", func() {
 			chain := MustFormatChainNameWithPrefix("test", "1234", "PREFIX-")
-			Expect(len(chain)).To(Equal(maxChainLength))
+			Expect(chain).To(HaveLen(maxChainLength))
 			Expect(chain).To(Equal("CNI-PREFIX-2bbe0c48b91a7d1b8"))
 		})
 
 		It("must truncate a long name", func() {
 			chain := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1234", "PREFIX-")
-			Expect(len(chain)).To(Equal(maxChainLength))
+			Expect(chain).To(HaveLen(maxChainLength))
 			Expect(chain).To(Equal("CNI-PREFIX-374f33fe84ab0ed84"))
 		})
 
 		It("must be predictable", func() {
 			chain1 := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1234", "PREFIX-")
 			chain2 := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1234", "PREFIX-")
-			Expect(len(chain1)).To(Equal(maxChainLength))
-			Expect(len(chain2)).To(Equal(maxChainLength))
+			Expect(chain1).To(HaveLen(maxChainLength))
+			Expect(chain2).To(HaveLen(maxChainLength))
 			Expect(chain1).To(Equal(chain2))
 		})
 
 		It("must change when a character changes", func() {
 			chain1 := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1234", "PREFIX-")
 			chain2 := MustFormatChainNameWithPrefix("testalongnamethatdoesnotmakesense", "1235", "PREFIX-")
-			Expect(len(chain1)).To(Equal(maxChainLength))
-			Expect(len(chain2)).To(Equal(maxChainLength))
+			Expect(chain1).To(HaveLen(maxChainLength))
+			Expect(chain2).To(HaveLen(maxChainLength))
 			Expect(chain1).To(Equal("CNI-PREFIX-374f33fe84ab0ed84"))
 			Expect(chain1).NotTo(Equal(chain2))
 		})
@@ -161,5 +161,4 @@ var _ = Describe("Utils", func() {
 			)
 		})
 	})
-
 })

plugins/ipam/dhcp/client.go

@@ -23,7 +23,7 @@ const (
 	MaxDHCPLen = 576
 )
 
-//Send the Discovery Packet to the Broadcast Channel
+// Send the Discovery Packet to the Broadcast Channel
 func DhcpSendDiscoverPacket(c *dhcp4client.Client, options dhcp4.Options) (dhcp4.Packet, error) {
 	discoveryPacket := c.DiscoverPacket()
 
@@ -35,7 +35,7 @@ func DhcpSendDiscoverPacket(c *dhcp4client.Client, options dhcp4.Options) (dhcp4
 	return discoveryPacket, c.SendPacket(discoveryPacket)
 }
 
-//Send Request Based On the offer Received.
+// Send Request Based On the offer Received.
 func DhcpSendRequest(c *dhcp4client.Client, options dhcp4.Options, offerPacket *dhcp4.Packet) (dhcp4.Packet, error) {
 	requestPacket := c.RequestPacket(offerPacket)
 
@@ -48,7 +48,7 @@ func DhcpSendRequest(c *dhcp4client.Client, options dhcp4.Options, offerPacket *
 	return requestPacket, c.SendPacket(requestPacket)
 }
 
-//Send Decline to the received acknowledgement.
+// Send Decline to the received acknowledgement.
 func DhcpSendDecline(c *dhcp4client.Client, acknowledgementPacket *dhcp4.Packet, options dhcp4.Options) (dhcp4.Packet, error) {
 	declinePacket := c.DeclinePacket(acknowledgementPacket)
 
@@ -61,7 +61,7 @@ func DhcpSendDecline(c *dhcp4client.Client, acknowledgementPacket *dhcp4.Packet,
 	return declinePacket, c.SendPacket(declinePacket)
 }
 
-//Lets do a Full DHCP Request.
+// Lets do a Full DHCP Request.
 func DhcpRequest(c *dhcp4client.Client, options dhcp4.Options) (bool, dhcp4.Packet, error) {
 	discoveryPacket, err := DhcpSendDiscoverPacket(c, options)
 	if err != nil {
@@ -91,8 +91,8 @@ func DhcpRequest(c *dhcp4client.Client, options dhcp4.Options) (bool, dhcp4.Pack
 	return true, acknowledgement, nil
 }
 
-//Renew a lease backed on the Acknowledgement Packet.
-//Returns Successful, The AcknoledgementPacket, Any Errors
+// Renew a lease backed on the Acknowledgement Packet.
+// Returns Successful, The AcknoledgementPacket, Any Errors
 func DhcpRenew(c *dhcp4client.Client, acknowledgement dhcp4.Packet, options dhcp4.Options) (bool, dhcp4.Packet, error) {
 	renewRequest := c.RenewalRequestPacket(&acknowledgement)
 
@@ -120,8 +120,8 @@ func DhcpRenew(c *dhcp4client.Client, acknowledgement dhcp4.Packet, options dhcp
 	return true, newAcknowledgement, nil
 }
 
-//Release a lease backed on the Acknowledgement Packet.
-//Returns Any Errors
+// Release a lease backed on the Acknowledgement Packet.
+// Returns Any Errors
 func DhcpRelease(c *dhcp4client.Client, acknowledgement dhcp4.Packet, options dhcp4.Options) error {
 	release := c.ReleasePacket(&acknowledgement)
 

plugins/ipam/dhcp/daemon.go

@@ -15,22 +15,25 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"net/rpc"
 	"os"
+	"os/signal"
 	"path/filepath"
 	"runtime"
 	"sync"
+	"syscall"
 	"time"
 
+	"github.com/coreos/go-systemd/v22/activation"
+
 	"github.com/containernetworking/cni/pkg/skel"
 	current "github.com/containernetworking/cni/pkg/types/100"
-	"github.com/coreos/go-systemd/v22/activation"
 )
 
 var errNoMoreTries = errors.New("no more tries")
@@ -53,7 +56,7 @@ func newDHCP(clientTimeout, clientResendMax time.Duration) *DHCP {
 }
 
 // TODO: current client ID is too long. At least the container ID should not be used directly.
-// A seperate issue is necessary to ensure no breaking change is affecting other users.
+// A separate issue is necessary to ensure no breaking change is affecting other users.
 func generateClientID(containerID string, netName string, ifName string) string {
 	clientID := containerID + "/" + netName + "/" + ifName
 	// defined in RFC 2132, length size can not be larger than 1 octet. So we truncate 254 to make everyone happy.
@@ -77,12 +80,20 @@ func (d *DHCP) Allocate(args *skel.CmdArgs, result *current.Result) error {
 	}
 
 	clientID := generateClientID(args.ContainerID, conf.Name, args.IfName)
-	hostNetns := d.hostNetnsPrefix + args.Netns
-	l, err := AcquireLease(clientID, hostNetns, args.IfName,
-		optsRequesting, optsProviding,
-		d.clientTimeout, d.clientResendMax, d.broadcast)
-	if err != nil {
-		return err
+
+	// If we already have an active lease for this clientID, do not create
+	// another one
+	l := d.getLease(clientID)
+	if l != nil {
+		l.Check()
+	} else {
+		hostNetns := d.hostNetnsPrefix + args.Netns
+		l, err = AcquireLease(clientID, hostNetns, args.IfName,
+			optsRequesting, optsProviding,
+			d.clientTimeout, d.clientResendMax, d.broadcast)
+		if err != nil {
+			return err
+		}
 	}
 
 	ipn, err := l.IPNet()
@@ -104,7 +115,7 @@ func (d *DHCP) Allocate(args *skel.CmdArgs, result *current.Result) error {
 
 // Release stops maintenance of the lease acquired in Allocate()
 // and sends a release msg to the DHCP server.
-func (d *DHCP) Release(args *skel.CmdArgs, reply *struct{}) error {
+func (d *DHCP) Release(args *skel.CmdArgs, _ *struct{}) error {
 	conf := NetConf{}
 	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
 		return fmt.Errorf("error parsing netconf: %v", err)
@@ -139,7 +150,7 @@ func (d *DHCP) setLease(clientID string, l *DHCPLease) {
 	d.leases[clientID] = l
 }
 
-//func (d *DHCP) clearLease(contID, netName, ifName string) {
+// func (d *DHCP) clearLease(contID, netName, ifName string) {
 func (d *DHCP) clearLease(clientID string) {
 	d.mux.Lock()
 	defer d.mux.Unlock()
@@ -156,7 +167,7 @@ func getListener(socketPath string) (net.Listener, error) {
 
 	switch {
 	case len(l) == 0:
-		if err := os.MkdirAll(filepath.Dir(socketPath), 0700); err != nil {
+		if err := os.MkdirAll(filepath.Dir(socketPath), 0o700); err != nil {
 			return nil, err
 		}
 		return net.Listen("unix", socketPath)
@@ -185,7 +196,7 @@ func runDaemon(
 		if !filepath.IsAbs(pidfilePath) {
 			return fmt.Errorf("Error writing pidfile %q: path not absolute", pidfilePath)
 		}
-		if err := ioutil.WriteFile(pidfilePath, []byte(fmt.Sprintf("%d", os.Getpid())), 0644); err != nil {
+		if err := os.WriteFile(pidfilePath, []byte(fmt.Sprintf("%d", os.Getpid())), 0o644); err != nil {
 			return fmt.Errorf("Error writing pidfile %q: %v", pidfilePath, err)
 		}
 	}
@@ -195,11 +206,27 @@ func runDaemon(
 		return fmt.Errorf("Error getting listener: %v", err)
 	}
 
+	srv := http.Server{}
+	exit := make(chan os.Signal, 1)
+	done := make(chan bool, 1)
+	signal.Notify(exit, os.Interrupt, syscall.SIGTERM)
+
+	go func() {
+		<-exit
+		srv.Shutdown(context.TODO())
+		os.Remove(hostPrefix + socketPath)
+		os.Remove(pidfilePath)
+
+		done <- true
+	}()
+
 	dhcp := newDHCP(dhcpClientTimeout, resendMax)
 	dhcp.hostNetnsPrefix = hostPrefix
 	dhcp.broadcast = broadcast
 	rpc.Register(dhcp)
 	rpc.HandleHTTP()
-	http.Serve(l, nil)
+	srv.Serve(l)
+
+	<-done
 	return nil
 }

plugins/ipam/dhcp/dhcp2_test.go

@@ -16,21 +16,19 @@ package main
 
 import (
 	"fmt"
-	"net"
 	"os"
 	"os/exec"
 	"sync"
 	"time"
 
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
+
 	"github.com/containernetworking/cni/pkg/skel"
 	current "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
-
-	"github.com/vishvananda/netlink"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
 )
 
 var _ = Describe("DHCP Multiple Lease Operations", func() {
@@ -40,11 +38,10 @@ var _ = Describe("DHCP Multiple Lease Operations", func() {
 	var clientCmd *exec.Cmd
 	var socketPath string
 	var tmpDir string
-	var serverIP net.IPNet
 	var err error
 
 	BeforeEach(func() {
-		dhcpServerStopCh, serverIP, socketPath, originalNS, targetNS, err = dhcpSetupOriginalNS()
+		dhcpServerStopCh, socketPath, originalNS, targetNS, err = dhcpSetupOriginalNS()
 		Expect(err).NotTo(HaveOccurred())
 
 		// Move the container side to the container's NS
@@ -64,7 +61,7 @@ var _ = Describe("DHCP Multiple Lease Operations", func() {
 		})
 
 		// Start the DHCP server
-		dhcpServerDone, err = dhcpServerStart(originalNS, net.IPv4(192, 168, 1, 5), serverIP.IP, 2, dhcpServerStopCh)
+		dhcpServerDone, err = dhcpServerStart(originalNS, 2, dhcpServerStopCh)
 		Expect(err).NotTo(HaveOccurred())
 
 		// Start the DHCP client daemon
@@ -123,7 +120,7 @@ var _ = Describe("DHCP Multiple Lease Operations", func() {
 
 			addResult, err = current.GetResult(r)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(len(addResult.IPs)).To(Equal(1))
+			Expect(addResult.IPs).To(HaveLen(1))
 			Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
 			return nil
 		})
@@ -146,7 +143,7 @@ var _ = Describe("DHCP Multiple Lease Operations", func() {
 
 			addResult, err = current.GetResult(r)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(len(addResult.IPs)).To(Equal(1))
+			Expect(addResult.IPs).To(HaveLen(1))
 			Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.6/24"))
 			return nil
 		})

plugins/ipam/dhcp/dhcp_suite_test.go

@@ -15,10 +15,10 @@
 package main
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestDHCP(t *testing.T) {

plugins/ipam/dhcp/dhcp_test.go

@@ -18,7 +18,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"os"
 	"os/exec"
@@ -26,24 +25,22 @@ import (
 	"sync"
 	"time"
 
-	"github.com/containernetworking/cni/pkg/skel"
-	"github.com/containernetworking/cni/pkg/types/100"
-	"github.com/containernetworking/plugins/pkg/ns"
-	"github.com/containernetworking/plugins/pkg/testutils"
-
-	"github.com/vishvananda/netlink"
-
 	"github.com/d2g/dhcp4"
 	"github.com/d2g/dhcp4server"
 	"github.com/d2g/dhcp4server/leasepool"
 	"github.com/d2g/dhcp4server/leasepool/memorypool"
-
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	types100 "github.com/containernetworking/cni/pkg/types/100"
+	"github.com/containernetworking/plugins/pkg/ns"
+	"github.com/containernetworking/plugins/pkg/testutils"
 )
 
 func getTmpDir() (string, error) {
-	tmpDir, err := ioutil.TempDir(cniDirPrefix, "dhcp")
+	tmpDir, err := os.MkdirTemp(cniDirPrefix, "dhcp")
 	if err == nil {
 		tmpDir = filepath.ToSlash(tmpDir)
 	}
@@ -51,7 +48,7 @@ func getTmpDir() (string, error) {
 	return tmpDir, err
 }
 
-func dhcpServerStart(netns ns.NetNS, leaseIP, serverIP net.IP, numLeases int, stopCh <-chan bool) (*sync.WaitGroup, error) {
+func dhcpServerStart(netns ns.NetNS, numLeases int, stopCh <-chan bool) (*sync.WaitGroup, error) {
 	// Add the expected IP to the pool
 	lp := memorypool.MemoryPool{}
 
@@ -121,7 +118,7 @@ const (
 )
 
 var _ = BeforeSuite(func() {
-	err := os.MkdirAll(cniDirPrefix, 0700)
+	err := os.MkdirAll(cniDirPrefix, 0o700)
 	Expect(err).NotTo(HaveOccurred())
 })
 
@@ -203,7 +200,7 @@ var _ = Describe("DHCP Operations", func() {
 		})
 
 		// Start the DHCP server
-		dhcpServerDone, err = dhcpServerStart(originalNS, net.IPv4(192, 168, 1, 5), serverIP.IP, 1, dhcpServerStopCh)
+		dhcpServerDone, err = dhcpServerStart(originalNS, 1, dhcpServerStopCh)
 		Expect(err).NotTo(HaveOccurred())
 
 		// Start the DHCP client daemon
@@ -274,7 +271,7 @@ var _ = Describe("DHCP Operations", func() {
 
 				addResult, err = types100.GetResult(r)
 				Expect(err).NotTo(HaveOccurred())
-				Expect(len(addResult.IPs)).To(Equal(1))
+				Expect(addResult.IPs).To(HaveLen(1))
 				Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
 				return nil
 			})
@@ -317,7 +314,7 @@ var _ = Describe("DHCP Operations", func() {
 
 				addResult, err = types100.GetResult(r)
 				Expect(err).NotTo(HaveOccurred())
-				Expect(len(addResult.IPs)).To(Equal(1))
+				Expect(addResult.IPs).To(HaveLen(1))
 				Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
 				return nil
 			})
@@ -335,9 +332,17 @@ var _ = Describe("DHCP Operations", func() {
 					started.Done()
 					started.Wait()
 
-					err = originalNS.Do(func(ns.NetNS) error {
+					err := originalNS.Do(func(ns.NetNS) error {
 						return testutils.CmdDelWithArgs(args, func() error {
-							return cmdDel(args)
+							copiedArgs := &skel.CmdArgs{
+								ContainerID: args.ContainerID,
+								Netns:       args.Netns,
+								IfName:      args.IfName,
+								StdinData:   args.StdinData,
+								Path:        args.Path,
+								Args:        args.Args,
+							}
+							return cmdDel(copiedArgs)
 						})
 					})
 					Expect(err).NotTo(HaveOccurred())
@@ -364,7 +369,7 @@ const (
 	contVethName1  string = "eth1"
 )
 
-func dhcpSetupOriginalNS() (chan bool, net.IPNet, string, ns.NetNS, ns.NetNS, error) {
+func dhcpSetupOriginalNS() (chan bool, string, ns.NetNS, ns.NetNS, error) {
 	var originalNS, targetNS ns.NetNS
 	var dhcpServerStopCh chan bool
 	var socketPath string
@@ -385,11 +390,6 @@ func dhcpSetupOriginalNS() (chan bool, net.IPNet, string, ns.NetNS, ns.NetNS, er
 	targetNS, err = testutils.NewNS()
 	Expect(err).NotTo(HaveOccurred())
 
-	serverIP := net.IPNet{
-		IP:   net.IPv4(192, 168, 1, 1),
-		Mask: net.IPv4Mask(255, 255, 255, 0),
-	}
-
 	// Use (original) NS
 	err = originalNS.Do(func(ns.NetNS) error {
 		defer GinkgoRecover()
@@ -484,7 +484,7 @@ func dhcpSetupOriginalNS() (chan bool, net.IPNet, string, ns.NetNS, ns.NetNS, er
 		return nil
 	})
 
-	return dhcpServerStopCh, serverIP, socketPath, originalNS, targetNS, err
+	return dhcpServerStopCh, socketPath, originalNS, targetNS, err
 }
 
 var _ = Describe("DHCP Lease Unavailable Operations", func() {
@@ -494,11 +494,10 @@ var _ = Describe("DHCP Lease Unavailable Operations", func() {
 	var clientCmd *exec.Cmd
 	var socketPath string
 	var tmpDir string
-	var serverIP net.IPNet
 	var err error
 
 	BeforeEach(func() {
-		dhcpServerStopCh, serverIP, socketPath, originalNS, targetNS, err = dhcpSetupOriginalNS()
+		dhcpServerStopCh, socketPath, originalNS, targetNS, err = dhcpSetupOriginalNS()
 		Expect(err).NotTo(HaveOccurred())
 
 		// Move the container side to the container's NS
@@ -518,7 +517,7 @@ var _ = Describe("DHCP Lease Unavailable Operations", func() {
 		})
 
 		// Start the DHCP server
-		dhcpServerDone, err = dhcpServerStart(originalNS, net.IPv4(192, 168, 1, 5), serverIP.IP, 1, dhcpServerStopCh)
+		dhcpServerDone, err = dhcpServerStart(originalNS, 1, dhcpServerStopCh)
 		Expect(err).NotTo(HaveOccurred())
 
 		// Start the DHCP client daemon
@@ -597,7 +596,7 @@ var _ = Describe("DHCP Lease Unavailable Operations", func() {
 
 				addResult, err = types100.GetResult(r)
 				Expect(err).NotTo(HaveOccurred())
-				Expect(len(addResult.IPs)).To(Equal(1))
+				Expect(addResult.IPs).To(HaveLen(1))
 				Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
 				return nil
 			})

plugins/ipam/dhcp/lease.go

@@ -34,13 +34,17 @@ import (
 
 // RFC 2131 suggests using exponential backoff, starting with 4sec
 // and randomized to +/- 1sec
-const resendDelay0 = 4 * time.Second
-const resendDelayMax = 62 * time.Second
+const (
+	resendDelay0   = 4 * time.Second
+	resendDelayMax = 62 * time.Second
+)
 
 // To speed up the retry for first few failures, we retry without
 // backoff for a few times
-const resendFastDelay = 2 * time.Second
-const resendFastMax = 4
+const (
+	resendFastDelay = 2 * time.Second
+	resendFastMax   = 4
+)
 
 const (
 	leaseStateBound = iota
@@ -67,6 +71,7 @@ type DHCPLease struct {
 	broadcast     bool
 	stopping      uint32
 	stop          chan struct{}
+	check         chan struct{}
 	wg            sync.WaitGroup
 	// list of requesting and providing options and if they are necessary / their value
 	optsRequesting map[dhcp4.OptionCode]bool
@@ -78,9 +83,12 @@ var requestOptionsDefault = map[dhcp4.OptionCode]bool{
 	dhcp4.OptionSubnetMask: true,
 }
 
-func prepareOptions(cniArgs string, ProvideOptions []ProvideOption, RequestOptions []RequestOption) (
-	optsRequesting map[dhcp4.OptionCode]bool, optsProviding map[dhcp4.OptionCode][]byte, err error) {
-
+func prepareOptions(cniArgs string, provideOptions []ProvideOption, requestOptions []RequestOption) (
+	map[dhcp4.OptionCode]bool, map[dhcp4.OptionCode][]byte, error,
+) {
+	var optsRequesting map[dhcp4.OptionCode]bool
+	var optsProviding map[dhcp4.OptionCode][]byte
+	var err error
 	// parse CNI args
 	cniArgsParsed := map[string]string{}
 	for _, argPair := range strings.Split(cniArgs, ";") {
@@ -93,23 +101,20 @@ func prepareOptions(cniArgs string, ProvideOptions []ProvideOption, RequestOptio
 	// parse providing options map
 	var optParsed dhcp4.OptionCode
 	optsProviding = make(map[dhcp4.OptionCode][]byte)
-	for _, opt := range ProvideOptions {
+	for _, opt := range provideOptions {
 		optParsed, err = parseOptionName(string(opt.Option))
 		if err != nil {
-			err = fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
-			return
+			return nil, nil, fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
 		}
 		if len(opt.Value) > 0 {
 			if len(opt.Value) > 255 {
-				err = fmt.Errorf("value too long for option %q: %q", opt.Option, opt.Value)
-				return
+				return nil, nil, fmt.Errorf("value too long for option %q: %q", opt.Option, opt.Value)
 			}
 			optsProviding[optParsed] = []byte(opt.Value)
 		}
 		if value, ok := cniArgsParsed[opt.ValueFromCNIArg]; ok {
 			if len(value) > 255 {
-				err = fmt.Errorf("value too long for option %q from CNI_ARGS %q: %q", opt.Option, opt.ValueFromCNIArg, opt.Value)
-				return
+				return nil, nil, fmt.Errorf("value too long for option %q from CNI_ARGS %q: %q", opt.Option, opt.ValueFromCNIArg, opt.Value)
 			}
 			optsProviding[optParsed] = []byte(value)
 		}
@@ -118,14 +123,13 @@ func prepareOptions(cniArgs string, ProvideOptions []ProvideOption, RequestOptio
 	// parse necessary options map
 	optsRequesting = make(map[dhcp4.OptionCode]bool)
 	skipRequireDefault := false
-	for _, opt := range RequestOptions {
+	for _, opt := range requestOptions {
 		if opt.SkipDefault {
 			skipRequireDefault = true
 		}
 		optParsed, err = parseOptionName(string(opt.Option))
 		if err != nil {
-			err = fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
-			return
+			return nil, nil, fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
 		}
 		optsRequesting[optParsed] = true
 	}
@@ -135,7 +139,7 @@ func prepareOptions(cniArgs string, ProvideOptions []ProvideOption, RequestOptio
 			optsRequesting[k] = v
 		}
 	}
-	return
+	return optsRequesting, optsProviding, err
 }
 
 // AcquireLease gets an DHCP lease and then maintains it in the background
@@ -150,6 +154,7 @@ func AcquireLease(
 	l := &DHCPLease{
 		clientID:       clientID,
 		stop:           make(chan struct{}),
+		check:          make(chan struct{}),
 		timeout:        timeout,
 		resendMax:      resendMax,
 		broadcast:      broadcast,
@@ -200,8 +205,36 @@ func (l *DHCPLease) Stop() {
 	l.wg.Wait()
 }
 
+func (l *DHCPLease) Check() {
+	l.check <- struct{}{}
+}
+
+func (l *DHCPLease) getOptionsWithClientID() dhcp4.Options {
+	opts := make(dhcp4.Options)
+	opts[dhcp4.OptionClientIdentifier] = []byte(l.clientID)
+	// client identifier's first byte is "type"
+	newClientID := []byte{0}
+	newClientID = append(newClientID, opts[dhcp4.OptionClientIdentifier]...)
+	opts[dhcp4.OptionClientIdentifier] = newClientID
+	return opts
+}
+
+func (l *DHCPLease) getAllOptions() dhcp4.Options {
+	opts := l.getOptionsWithClientID()
+
+	for k, v := range l.optsProviding {
+		opts[k] = v
+	}
+
+	opts[dhcp4.OptionParameterRequestList] = []byte{}
+	for k := range l.optsRequesting {
+		opts[dhcp4.OptionParameterRequestList] = append(opts[dhcp4.OptionParameterRequestList], byte(k))
+	}
+	return opts
+}
+
 func (l *DHCPLease) acquire() error {
-	c, err := newDHCPClient(l.link, l.clientID, l.timeout, l.broadcast)
+	c, err := newDHCPClient(l.link, l.timeout, l.broadcast)
 	if err != nil {
 		return err
 	}
@@ -214,19 +247,7 @@ func (l *DHCPLease) acquire() error {
 		}
 	}
 
-	opts := make(dhcp4.Options)
-	opts[dhcp4.OptionClientIdentifier] = []byte(l.clientID)
-	opts[dhcp4.OptionParameterRequestList] = []byte{}
-	for k := range l.optsRequesting {
-		opts[dhcp4.OptionParameterRequestList] = append(opts[dhcp4.OptionParameterRequestList], byte(k))
-	}
-	for k, v := range l.optsProviding {
-		opts[k] = v
-	}
-	// client identifier's first byte is "type"
-	newClientID := []byte{0}
-	newClientID = append(newClientID, opts[dhcp4.OptionClientIdentifier]...)
-	opts[dhcp4.OptionClientIdentifier] = newClientID
+	opts := l.getAllOptions()
 
 	pkt, err := backoffRetry(l.resendMax, func() (*dhcp4.Packet, error) {
 		ok, ack, err := DhcpRequest(c, opts)
@@ -284,7 +305,7 @@ func (l *DHCPLease) maintain() {
 
 		switch state {
 		case leaseStateBound:
-			sleepDur = l.renewalTime.Sub(time.Now())
+			sleepDur = time.Until(l.renewalTime)
 			if sleepDur <= 0 {
 				log.Printf("%v: renewing lease", l.clientID)
 				state = leaseStateRenewing
@@ -296,7 +317,7 @@ func (l *DHCPLease) maintain() {
 				log.Printf("%v: %v", l.clientID, err)
 
 				if time.Now().After(l.rebindingTime) {
-					log.Printf("%v: renawal time expired, rebinding", l.clientID)
+					log.Printf("%v: renewal time expired, rebinding", l.clientID)
 					state = leaseStateRebinding
 				}
 			} else {
@@ -322,6 +343,9 @@ func (l *DHCPLease) maintain() {
 		select {
 		case <-time.After(sleepDur):
 
+		case <-l.check:
+			log.Printf("%v: Checking lease", l.clientID)
+
 		case <-l.stop:
 			if err := l.release(); err != nil {
 				log.Printf("%v: failed to release DHCP lease: %v", l.clientID, err)
@@ -338,15 +362,13 @@ func (l *DHCPLease) downIface() {
 }
 
 func (l *DHCPLease) renew() error {
-	c, err := newDHCPClient(l.link, l.clientID, l.timeout, l.broadcast)
+	c, err := newDHCPClient(l.link, l.timeout, l.broadcast)
 	if err != nil {
 		return err
 	}
 	defer c.Close()
 
-	opts := make(dhcp4.Options)
-	opts[dhcp4.OptionClientIdentifier] = []byte(l.clientID)
-
+	opts := l.getAllOptions()
 	pkt, err := backoffRetry(l.resendMax, func() (*dhcp4.Packet, error) {
 		ok, ack, err := DhcpRenew(c, *l.ack, opts)
 		switch {
@@ -369,14 +391,13 @@ func (l *DHCPLease) renew() error {
 func (l *DHCPLease) release() error {
 	log.Printf("%v: releasing lease", l.clientID)
 
-	c, err := newDHCPClient(l.link, l.clientID, l.timeout, l.broadcast)
+	c, err := newDHCPClient(l.link, l.timeout, l.broadcast)
 	if err != nil {
 		return err
 	}
 	defer c.Close()
 
-	opts := make(dhcp4.Options)
-	opts[dhcp4.OptionClientIdentifier] = []byte(l.clientID)
+	opts := l.getOptionsWithClientID()
 
 	if err = DhcpRelease(c, *l.ack, opts); err != nil {
 		return fmt.Errorf("failed to send DHCPRELEASE")
@@ -406,9 +427,9 @@ func (l *DHCPLease) Routes() []*types.Route {
 
 	// RFC 3442 states that if Classless Static Routes (option 121)
 	// exist, we ignore Static Routes (option 33) and the Router/Gateway.
-	opt121_routes := parseCIDRRoutes(l.opts)
-	if len(opt121_routes) > 0 {
-		return append(routes, opt121_routes...)
+	opt121Routes := parseCIDRRoutes(l.opts)
+	if len(opt121Routes) > 0 {
+		return append(routes, opt121Routes...)
 	}
 
 	// Append Static Routes
@@ -430,9 +451,9 @@ func jitter(span time.Duration) time.Duration {
 }
 
 func backoffRetry(resendMax time.Duration, f func() (*dhcp4.Packet, error)) (*dhcp4.Packet, error) {
-	var baseDelay time.Duration = resendDelay0
+	baseDelay := resendDelay0
 	var sleepTime time.Duration
-	var fastRetryLimit = resendFastMax
+	fastRetryLimit := resendFastMax
 	for {
 		pkt, err := f()
 		if err == nil {
@@ -464,7 +485,7 @@ func backoffRetry(resendMax time.Duration, f func() (*dhcp4.Packet, error)) (*dh
 }
 
 func newDHCPClient(
-	link netlink.Link, clientID string,
+	link netlink.Link,
 	timeout time.Duration,
 	broadcast bool,
 ) (*dhcp4client.Client, error) {

plugins/ipam/dhcp/main.go

@@ -118,27 +118,20 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 func cmdDel(args *skel.CmdArgs) error {
 	result := struct{}{}
-	if err := rpcCall("DHCP.Release", args, &result); err != nil {
-		return err
-	}
-	return nil
+	return rpcCall("DHCP.Release", args, &result)
 }
 
 func cmdCheck(args *skel.CmdArgs) error {
 	// Plugin must return result in same version as specified in netconf
 	versionDecoder := &version.ConfigDecoder{}
-	//confVersion, err := versionDecoder.Decode(args.StdinData)
+	// confVersion, err := versionDecoder.Decode(args.StdinData)
 	_, err := versionDecoder.Decode(args.StdinData)
 	if err != nil {
 		return err
 	}
 
 	result := &current.Result{CNIVersion: current.ImplementedSpecVersion}
-	if err := rpcCall("DHCP.Allocate", args, result); err != nil {
-		return err
-	}
-
-	return nil
+	return rpcCall("DHCP.Allocate", args, result)
 }
 
 func getSocketPath(stdinData []byte) (string, error) {

plugins/ipam/dhcp/options.go

@@ -21,8 +21,9 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/containernetworking/cni/pkg/types"
 	"github.com/d2g/dhcp4"
+
+	"github.com/containernetworking/cni/pkg/types"
 )
 
 var optionNameToID = map[string]dhcp4.OptionCode{

plugins/ipam/dhcp/options_test.go

@@ -19,8 +19,9 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/containernetworking/cni/pkg/types"
 	"github.com/d2g/dhcp4"
+
+	"github.com/containernetworking/cni/pkg/types"
 )
 
 func validateRoutes(t *testing.T, routes []*types.Route) {

plugins/ipam/host-local/backend/allocator/allocator.go

@@ -22,7 +22,6 @@ import (
 	"strconv"
 
 	current "github.com/containernetworking/cni/pkg/types/100"
-
 	"github.com/containernetworking/plugins/pkg/ip"
 	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend"
 )
@@ -197,7 +196,7 @@ func (i *RangeIter) Next() (*net.IPNet, net.IP) {
 	// If we've reached the end of this range, we need to advance the range
 	// RangeEnd is inclusive as well
 	if i.cur.Equal(r.RangeEnd) {
-		i.rangeIdx += 1
+		i.rangeIdx++
 		i.rangeIdx %= len(*i.rangeset)
 		r = (*i.rangeset)[i.rangeIdx]
 

plugins/ipam/host-local/backend/allocator/allocator_suite_test.go

@@ -15,10 +15,10 @@
 package allocator_test
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestAllocator(t *testing.T) {

plugins/ipam/host-local/backend/allocator/allocator_test.go

@@ -18,12 +18,12 @@ import (
 	"fmt"
 	"net"
 
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
 	"github.com/containernetworking/cni/pkg/types"
 	current "github.com/containernetworking/cni/pkg/types/100"
 	fakestore "github.com/containernetworking/plugins/plugins/ipam/host-local/backend/testing"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
 )
 
 type AllocatorTestCase struct {
@@ -77,7 +77,7 @@ func (t AllocatorTestCase) run(idx int) (*current.IPConfig, error) {
 		p = append(p, Range{Subnet: types.IPNet(*subnet)})
 	}
 
-	Expect(p.Canonicalize()).To(BeNil())
+	Expect(p.Canonicalize()).To(Succeed())
 
 	store := fakestore.NewFakeStore(t.ipmap, map[string]net.IP{"rangeid": net.ParseIP(t.lastIP)})
 
@@ -262,7 +262,6 @@ var _ = Describe("host-local ip allocator", func() {
 			res, err = alloc.Get("ID", "eth0", nil)
 			Expect(err).ToNot(HaveOccurred())
 			Expect(res.Address.String()).To(Equal("192.168.1.3/29"))
-
 		})
 
 		Context("when requesting a specific IP", func() {
@@ -301,7 +300,6 @@ var _ = Describe("host-local ip allocator", func() {
 				Expect(err).To(HaveOccurred())
 			})
 		})
-
 	})
 	Context("when out of ips", func() {
 		It("returns a meaningful error", func() {
@@ -332,7 +330,7 @@ var _ = Describe("host-local ip allocator", func() {
 			}
 			for idx, tc := range testCases {
 				_, err := tc.run(idx)
-				Expect(err).NotTo(BeNil())
+				Expect(err).To(HaveOccurred())
 				Expect(err.Error()).To(HavePrefix("no IP addresses available in range set"))
 			}
 		})

plugins/ipam/host-local/backend/allocator/config.go

@@ -21,7 +21,6 @@ import (
 
 	"github.com/containernetworking/cni/pkg/types"
 	"github.com/containernetworking/cni/pkg/version"
-
 	"github.com/containernetworking/plugins/pkg/ip"
 )
 
@@ -43,7 +42,7 @@ type Net struct {
 
 // IPAMConfig represents the IP related network configuration.
 // This nests Range because we initially only supported a single
-// range directly, and wish to preserve backwards compatability
+// range directly, and wish to preserve backwards compatibility
 type IPAMConfig struct {
 	*Range
 	Name       string

plugins/ipam/host-local/backend/allocator/config_test.go

@@ -17,9 +17,10 @@ package allocator
 import (
 	"net"
 
-	"github.com/containernetworking/cni/pkg/types"
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+
+	"github.com/containernetworking/cni/pkg/types"
 )
 
 var _ = Describe("IPAM config", func() {
@@ -415,7 +416,6 @@ var _ = Describe("IPAM config", func() {
 		}`
 		_, _, err := LoadIPAMConfig([]byte(input), "")
 		Expect(err).To(MatchError("invalid range set 0: mixed address families"))
-
 	})
 
 	It("Should should error on too many ranges", func() {

plugins/ipam/host-local/backend/allocator/range.go

@@ -125,7 +125,7 @@ func (r *Range) Contains(addr net.IP) bool {
 
 // Overlaps returns true if there is any overlap between ranges
 func (r *Range) Overlaps(r1 *Range) bool {
-	// different familes
+	// different families
 	if len(r.RangeStart) != len(r1.RangeStart) {
 		return false
 	}

plugins/ipam/host-local/backend/allocator/range_set.go

@@ -67,10 +67,8 @@ func (s *RangeSet) Canonicalize() error {
 		}
 		if i == 0 {
 			fam = len((*s)[i].RangeStart)
-		} else {
-			if fam != len((*s)[i].RangeStart) {
-				return fmt.Errorf("mixed address families")
-			}
+		} else if fam != len((*s)[i].RangeStart) {
+			return fmt.Errorf("mixed address families")
 		}
 	}
 

plugins/ipam/host-local/backend/allocator/range_set_test.go

@@ -17,7 +17,7 @@ package allocator
 import (
 	"net"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 
@@ -40,7 +40,6 @@ var _ = Describe("range sets", func() {
 		r, err = p.RangeFor(net.IP{192, 168, 99, 99})
 		Expect(r).To(BeNil())
 		Expect(err).To(MatchError("192.168.99.99 not in range set 192.168.0.1-192.168.0.254,172.16.1.1-172.16.1.254"))
-
 	})
 
 	It("should discover overlaps within a set", func() {

plugins/ipam/host-local/backend/allocator/range_test.go

@@ -17,11 +17,10 @@ package allocator
 import (
 	"net"
 
-	"github.com/containernetworking/cni/pkg/types"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/ginkgo/extensions/table"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+
+	"github.com/containernetworking/cni/pkg/types"
 )
 
 var _ = Describe("IP ranges", func() {

plugins/ipam/host-local/backend/disk/backend.go

@@ -15,7 +15,6 @@
 package disk
 
 import (
-	"io/ioutil"
 	"net"
 	"os"
 	"path/filepath"
@@ -25,8 +24,10 @@ import (
 	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend"
 )
 
-const lastIPFilePrefix = "last_reserved_ip."
-const LineBreak = "\r\n"
+const (
+	lastIPFilePrefix = "last_reserved_ip."
+	LineBreak        = "\r\n"
+)
 
 var defaultDataDir = "/var/lib/cni/networks"
 
@@ -45,7 +46,7 @@ func New(network, dataDir string) (*Store, error) {
 		dataDir = defaultDataDir
 	}
 	dir := filepath.Join(dataDir, network)
-	if err := os.MkdirAll(dir, 0755); err != nil {
+	if err := os.MkdirAll(dir, 0o755); err != nil {
 		return nil, err
 	}
 
@@ -59,7 +60,7 @@ func New(network, dataDir string) (*Store, error) {
 func (s *Store) Reserve(id string, ifname string, ip net.IP, rangeID string) (bool, error) {
 	fname := GetEscapedPath(s.dataDir, ip.String())
 
-	f, err := os.OpenFile(fname, os.O_RDWR|os.O_EXCL|os.O_CREATE, 0644)
+	f, err := os.OpenFile(fname, os.O_RDWR|os.O_EXCL|os.O_CREATE, 0o600)
 	if os.IsExist(err) {
 		return false, nil
 	}
@@ -77,7 +78,7 @@ func (s *Store) Reserve(id string, ifname string, ip net.IP, rangeID string) (bo
 	}
 	// store the reserved ip in lastIPFile
 	ipfile := GetEscapedPath(s.dataDir, lastIPFilePrefix+rangeID)
-	err = ioutil.WriteFile(ipfile, []byte(ip.String()), 0644)
+	err = os.WriteFile(ipfile, []byte(ip.String()), 0o600)
 	if err != nil {
 		return false, err
 	}
@@ -87,25 +88,21 @@ func (s *Store) Reserve(id string, ifname string, ip net.IP, rangeID string) (bo
 // LastReservedIP returns the last reserved IP if exists
 func (s *Store) LastReservedIP(rangeID string) (net.IP, error) {
 	ipfile := GetEscapedPath(s.dataDir, lastIPFilePrefix+rangeID)
-	data, err := ioutil.ReadFile(ipfile)
+	data, err := os.ReadFile(ipfile)
 	if err != nil {
 		return nil, err
 	}
 	return net.ParseIP(string(data)), nil
 }
 
-func (s *Store) Release(ip net.IP) error {
-	return os.Remove(GetEscapedPath(s.dataDir, ip.String()))
-}
-
-func (s *Store) FindByKey(id string, ifname string, match string) (bool, error) {
+func (s *Store) FindByKey(match string) (bool, error) {
 	found := false
 
 	err := filepath.Walk(s.dataDir, func(path string, info os.FileInfo, err error) error {
 		if err != nil || info.IsDir() {
 			return nil
 		}
-		data, err := ioutil.ReadFile(path)
+		data, err := os.ReadFile(path)
 		if err != nil {
 			return nil
 		}
@@ -115,33 +112,31 @@ func (s *Store) FindByKey(id string, ifname string, match string) (bool, error)
 		return nil
 	})
 	return found, err
-
 }
 
 func (s *Store) FindByID(id string, ifname string) bool {
 	s.Lock()
 	defer s.Unlock()
 
-	found := false
 	match := strings.TrimSpace(id) + LineBreak + ifname
-	found, err := s.FindByKey(id, ifname, match)
+	found, err := s.FindByKey(match)
 
 	// Match anything created by this id
 	if !found && err == nil {
 		match := strings.TrimSpace(id)
-		found, err = s.FindByKey(id, ifname, match)
+		found, _ = s.FindByKey(match)
 	}
 
 	return found
 }
 
-func (s *Store) ReleaseByKey(id string, ifname string, match string) (bool, error) {
+func (s *Store) ReleaseByKey(match string) (bool, error) {
 	found := false
 	err := filepath.Walk(s.dataDir, func(path string, info os.FileInfo, err error) error {
 		if err != nil || info.IsDir() {
 			return nil
 		}
-		data, err := ioutil.ReadFile(path)
+		data, err := os.ReadFile(path)
 		if err != nil {
 			return nil
 		}
@@ -154,20 +149,18 @@ func (s *Store) ReleaseByKey(id string, ifname string, match string) (bool, erro
 		return nil
 	})
 	return found, err
-
 }
 
 // N.B. This function eats errors to be tolerant and
 // release as much as possible
 func (s *Store) ReleaseByID(id string, ifname string) error {
-	found := false
 	match := strings.TrimSpace(id) + LineBreak + ifname
-	found, err := s.ReleaseByKey(id, ifname, match)
+	found, err := s.ReleaseByKey(match)
 
 	// For backwards compatibility, look for files written by a previous version
 	if !found && err == nil {
 		match := strings.TrimSpace(id)
-		found, err = s.ReleaseByKey(id, ifname, match)
+		_, err = s.ReleaseByKey(match)
 	}
 	return err
 }
@@ -185,7 +178,7 @@ func (s *Store) GetByID(id string, ifname string) []net.IP {
 		if err != nil || info.IsDir() {
 			return nil
 		}
-		data, err := ioutil.ReadFile(path)
+		data, err := os.ReadFile(path)
 		if err != nil {
 			return nil
 		}
@@ -203,7 +196,7 @@ func (s *Store) GetByID(id string, ifname string) []net.IP {
 
 func GetEscapedPath(dataDir string, fname string) string {
 	if runtime.GOOS == "windows" {
-		fname = strings.Replace(fname, ":", "_", -1)
+		fname = strings.ReplaceAll(fname, ":", "_")
 	}
 	return filepath.Join(dataDir, fname)
 }

plugins/ipam/host-local/backend/disk/disk_suite_test.go

@@ -15,10 +15,10 @@
 package disk
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestLock(t *testing.T) {

plugins/ipam/host-local/backend/disk/lock.go

@@ -15,9 +15,10 @@
 package disk
 
 import (
-	"github.com/alexflint/go-filemutex"
 	"os"
 	"path"
+
+	"github.com/alexflint/go-filemutex"
 )
 
 // FileLock wraps os.File to be used as a lock using flock

plugins/ipam/host-local/backend/disk/lock_test.go

@@ -15,23 +15,22 @@
 package disk
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 
 var _ = Describe("Lock Operations", func() {
 	It("locks a file path", func() {
-		dir, err := ioutil.TempDir("", "")
+		dir, err := os.MkdirTemp("", "")
 		Expect(err).ToNot(HaveOccurred())
 		defer os.RemoveAll(dir)
 
 		// create a dummy file to lock
 		path := filepath.Join(dir, "x")
-		f, err := os.OpenFile(path, os.O_RDONLY|os.O_CREATE, 0666)
+		f, err := os.OpenFile(path, os.O_RDONLY|os.O_CREATE, 0o666)
 		Expect(err).ToNot(HaveOccurred())
 		err = f.Close()
 		Expect(err).ToNot(HaveOccurred())
@@ -47,7 +46,7 @@ var _ = Describe("Lock Operations", func() {
 	})
 
 	It("locks a folder path", func() {
-		dir, err := ioutil.TempDir("", "")
+		dir, err := os.MkdirTemp("", "")
 		Expect(err).ToNot(HaveOccurred())
 		defer os.RemoveAll(dir)
 

plugins/ipam/host-local/backend/store.go

@@ -22,7 +22,6 @@ type Store interface {
 	Close() error
 	Reserve(id string, ifname string, ip net.IP, rangeID string) (bool, error)
 	LastReservedIP(rangeID string) (net.IP, error)
-	Release(ip net.IP) error
 	ReleaseByID(id string, ifname string) error
 	GetByID(id string, ifname string) []net.IP
 }

plugins/ipam/host-local/backend/testing/fake_store.go

@@ -45,7 +45,7 @@ func (s *FakeStore) Close() error {
 	return nil
 }
 
-func (s *FakeStore) Reserve(id string, ifname string, ip net.IP, rangeID string) (bool, error) {
+func (s *FakeStore) Reserve(id string, _ string, ip net.IP, rangeID string) (bool, error) {
 	key := ip.String()
 	if _, ok := s.ipMap[key]; !ok {
 		s.ipMap[key] = id
@@ -63,12 +63,7 @@ func (s *FakeStore) LastReservedIP(rangeID string) (net.IP, error) {
 	return ip, nil
 }
 
-func (s *FakeStore) Release(ip net.IP) error {
-	delete(s.ipMap, ip.String())
-	return nil
-}
-
-func (s *FakeStore) ReleaseByID(id string, ifname string) error {
+func (s *FakeStore) ReleaseByID(id string, _ string) error {
 	toDelete := []string{}
 	for k, v := range s.ipMap {
 		if v == id {
@@ -81,7 +76,7 @@ func (s *FakeStore) ReleaseByID(id string, ifname string) error {
 	return nil
 }
 
-func (s *FakeStore) GetByID(id string, ifname string) []net.IP {
+func (s *FakeStore) GetByID(id string, _ string) []net.IP {
 	var ips []net.IP
 	for k, v := range s.ipMap {
 		if v == id {

plugins/ipam/host-local/dns_test.go

@@ -15,12 +15,12 @@
 package main
 
 import (
-	"io/ioutil"
 	"os"
 
-	"github.com/containernetworking/cni/pkg/types"
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+
+	"github.com/containernetworking/cni/pkg/types"
 )
 
 var _ = Describe("parsing resolv.conf", func() {
@@ -64,7 +64,7 @@ options four
 })
 
 func parse(contents string) (*types.DNS, error) {
-	f, err := ioutil.TempFile("", "host_local_resolv")
+	f, err := os.CreateTemp("", "host_local_resolv")
 	if err != nil {
 		return nil, err
 	}

plugins/ipam/host-local/host_local_suite_test.go

@@ -15,10 +15,10 @@
 package main
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestHostLocal(t *testing.T) {

plugins/ipam/host-local/host_local_test.go

@@ -16,20 +16,19 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"path/filepath"
 	"strings"
 
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
 	"github.com/containernetworking/cni/pkg/skel"
 	"github.com/containernetworking/cni/pkg/types"
-	"github.com/containernetworking/cni/pkg/types/100"
+	types100 "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/plugins/pkg/testutils"
-
 	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/disk"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
 )
 
 const LineBreak = "\r\n"
@@ -43,7 +42,7 @@ var _ = Describe("host-local Operations", func() {
 
 	BeforeEach(func() {
 		var err error
-		tmpDir, err = ioutil.TempDir("", "host-local_test")
+		tmpDir, err = os.MkdirTemp("", "host-local_test")
 		Expect(err).NotTo(HaveOccurred())
 		tmpDir = filepath.ToSlash(tmpDir)
 	})
@@ -58,7 +57,7 @@ var _ = Describe("host-local Operations", func() {
 		ver := ver
 
 		It(fmt.Sprintf("[%s] allocates and releases addresses with ADD/DEL", ver), func() {
-			err := ioutil.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0644)
+			err := os.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0o644)
 			Expect(err).NotTo(HaveOccurred())
 
 			conf := fmt.Sprintf(`{
@@ -115,7 +114,7 @@ var _ = Describe("host-local Operations", func() {
 					Gateway: net.ParseIP("2001:db8:1::1"),
 				},
 			))
-			Expect(len(result.IPs)).To(Equal(2))
+			Expect(result.IPs).To(HaveLen(2))
 
 			for _, expectedRoute := range []*types.Route{
 				{Dst: mustCIDR("0.0.0.0/0"), GW: nil},
@@ -134,22 +133,22 @@ var _ = Describe("host-local Operations", func() {
 			}
 
 			ipFilePath1 := filepath.Join(tmpDir, "mynet", "10.1.2.2")
-			contents, err := ioutil.ReadFile(ipFilePath1)
+			contents, err := os.ReadFile(ipFilePath1)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal(args.ContainerID + LineBreak + ifname))
 
 			ipFilePath2 := filepath.Join(tmpDir, disk.GetEscapedPath("mynet", "2001:db8:1::2"))
-			contents, err = ioutil.ReadFile(ipFilePath2)
+			contents, err = os.ReadFile(ipFilePath2)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal(args.ContainerID + LineBreak + ifname))
 
 			lastFilePath1 := filepath.Join(tmpDir, "mynet", "last_reserved_ip.0")
-			contents, err = ioutil.ReadFile(lastFilePath1)
+			contents, err = os.ReadFile(lastFilePath1)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal("10.1.2.2"))
 
 			lastFilePath2 := filepath.Join(tmpDir, "mynet", "last_reserved_ip.1")
-			contents, err = ioutil.ReadFile(lastFilePath2)
+			contents, err = os.ReadFile(lastFilePath2)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal("2001:db8:1::2"))
 			// Release the IP
@@ -167,7 +166,7 @@ var _ = Describe("host-local Operations", func() {
 		It(fmt.Sprintf("[%s] allocates and releases addresses on specific interface with ADD/DEL", ver), func() {
 			const ifname1 string = "eth1"
 
-			err := ioutil.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0644)
+			err := os.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0o644)
 			Expect(err).NotTo(HaveOccurred())
 
 			conf0 := fmt.Sprintf(`{
@@ -239,12 +238,12 @@ var _ = Describe("host-local Operations", func() {
 			Expect(err).NotTo(HaveOccurred())
 
 			ipFilePath0 := filepath.Join(tmpDir, "mynet0", "10.1.2.2")
-			contents, err := ioutil.ReadFile(ipFilePath0)
+			contents, err := os.ReadFile(ipFilePath0)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal(args0.ContainerID + LineBreak + ifname))
 
 			ipFilePath1 := filepath.Join(tmpDir, "mynet1", "10.2.2.2")
-			contents, err = ioutil.ReadFile(ipFilePath1)
+			contents, err = os.ReadFile(ipFilePath1)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal(args1.ContainerID + LineBreak + ifname1))
 
@@ -257,7 +256,7 @@ var _ = Describe("host-local Operations", func() {
 			Expect(err).To(HaveOccurred())
 
 			// reread ipFilePath1, ensure that ifname1 didn't get deleted
-			contents, err = ioutil.ReadFile(ipFilePath1)
+			contents, err = os.ReadFile(ipFilePath1)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal(args1.ContainerID + LineBreak + ifname1))
 
@@ -311,7 +310,7 @@ var _ = Describe("host-local Operations", func() {
 
 			result0, err := types100.GetResult(r0)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(len(result0.IPs)).Should(Equal(1))
+			Expect(result0.IPs).Should(HaveLen(1))
 			Expect(result0.IPs[0].Address.String()).Should(Equal("10.1.2.2/24"))
 
 			// Allocate the IP with the same container ID
@@ -331,7 +330,7 @@ var _ = Describe("host-local Operations", func() {
 
 			result1, err := types100.GetResult(r1)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(len(result1.IPs)).Should(Equal(1))
+			Expect(result1.IPs).Should(HaveLen(1))
 			Expect(result1.IPs[0].Address.String()).Should(Equal("10.1.2.3/24"))
 
 			// Allocate the IP with the same container ID again
@@ -357,7 +356,7 @@ var _ = Describe("host-local Operations", func() {
 		})
 
 		It(fmt.Sprintf("[%s] verify DEL works on backwards compatible allocate", ver), func() {
-			err := ioutil.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0644)
+			err := os.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0o644)
 			Expect(err).NotTo(HaveOccurred())
 
 			conf := fmt.Sprintf(`{
@@ -395,10 +394,10 @@ var _ = Describe("host-local Operations", func() {
 			Expect(err).NotTo(HaveOccurred())
 
 			ipFilePath := filepath.Join(tmpDir, "mynet", "10.1.2.2")
-			contents, err := ioutil.ReadFile(ipFilePath)
+			contents, err := os.ReadFile(ipFilePath)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal(args.ContainerID + LineBreak + ifname))
-			err = ioutil.WriteFile(ipFilePath, []byte(strings.TrimSpace(args.ContainerID)), 0644)
+			err = os.WriteFile(ipFilePath, []byte(strings.TrimSpace(args.ContainerID)), 0o644)
 			Expect(err).NotTo(HaveOccurred())
 
 			err = testutils.CmdDelWithArgs(args, func() error {
@@ -466,7 +465,7 @@ var _ = Describe("host-local Operations", func() {
 			Expect(err).NotTo(HaveOccurred())
 
 			ipFilePath := filepath.Join(tmpDir, "mynet", result.IPs[0].Address.IP.String())
-			contents, err := ioutil.ReadFile(ipFilePath)
+			contents, err := os.ReadFile(ipFilePath)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(string(contents)).To(Equal("dummy" + LineBreak + ifname))
 
@@ -505,7 +504,7 @@ var _ = Describe("host-local Operations", func() {
 				return cmdAdd(args)
 			})
 			Expect(err).NotTo(HaveOccurred())
-			Expect(strings.Index(string(out), "Error retriving last reserved ip")).To(Equal(-1))
+			Expect(strings.Index(string(out), "Error retrieving last reserved ip")).To(Equal(-1))
 		})
 
 		It(fmt.Sprintf("[%s] allocates a custom IP when requested by config args", ver), func() {
@@ -547,7 +546,7 @@ var _ = Describe("host-local Operations", func() {
 		})
 
 		It(fmt.Sprintf("[%s] allocates custom IPs from multiple ranges", ver), func() {
-			err := ioutil.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0644)
+			err := os.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0o644)
 			Expect(err).NotTo(HaveOccurred())
 
 			conf := fmt.Sprintf(`{
@@ -595,7 +594,7 @@ var _ = Describe("host-local Operations", func() {
 		})
 
 		It(fmt.Sprintf("[%s] allocates custom IPs from multiple protocols", ver), func() {
-			err := ioutil.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0644)
+			err := os.WriteFile(filepath.Join(tmpDir, "resolv.conf"), []byte("nameserver 192.0.2.3"), 0o644)
 			Expect(err).NotTo(HaveOccurred())
 
 			conf := fmt.Sprintf(`{

plugins/ipam/host-local/main.go

@@ -19,14 +19,13 @@ import (
 	"net"
 	"strings"
 
-	bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
-	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
-	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/disk"
-
 	"github.com/containernetworking/cni/pkg/skel"
 	"github.com/containernetworking/cni/pkg/types"
 	current "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/cni/pkg/version"
+	bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
+	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
+	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/disk"
 )
 
 func main() {
@@ -34,7 +33,6 @@ func main() {
 }
 
 func cmdCheck(args *skel.CmdArgs) error {
-
 	ipamConf, _, err := allocator.LoadIPAMConfig(args.StdinData, args.Args)
 	if err != nil {
 		return err
@@ -48,8 +46,8 @@ func cmdCheck(args *skel.CmdArgs) error {
 	}
 	defer store.Close()
 
-	containerIpFound := store.FindByID(args.ContainerID, args.IfName)
-	if containerIpFound == false {
+	containerIPFound := store.FindByID(args.ContainerID, args.IfName)
+	if !containerIPFound {
 		return fmt.Errorf("host-local: Failed to find address added by container %v", args.ContainerID)
 	}
 
@@ -84,7 +82,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 	// Store all requested IPs in a map, so we can easily remove ones we use
 	// and error if some remain
-	requestedIPs := map[string]net.IP{} //net.IP cannot be a key
+	requestedIPs := map[string]net.IP{} // net.IP cannot be a key
 
 	for _, ip := range ipamConf.IPArgs {
 		requestedIPs[ip.String()] = ip

plugins/ipam/static/main.go

@@ -276,7 +276,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 	return types.PrintResult(result, confVersion)
 }
 
-func cmdDel(args *skel.CmdArgs) error {
+func cmdDel(_ *skel.CmdArgs) error {
 	// Nothing required because of no resource allocation in static plugin.
 	return nil
 }

plugins/ipam/static/static_suite_test.go

@@ -17,7 +17,7 @@ package main_test
 import (
 	"testing"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
 

plugins/ipam/static/static_test.go

@@ -19,13 +19,13 @@ import (
 	"net"
 	"strings"
 
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
 	"github.com/containernetworking/cni/pkg/skel"
 	"github.com/containernetworking/cni/pkg/types"
 	types100 "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/plugins/pkg/testutils"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
 )
 
 var _ = Describe("static Operations", func() {
@@ -97,7 +97,7 @@ var _ = Describe("static Operations", func() {
 					Gateway: net.ParseIP("3ffe:ffff:0::1"),
 				},
 			))
-			Expect(len(result.IPs)).To(Equal(2))
+			Expect(result.IPs).To(HaveLen(2))
 
 			Expect(result.Routes).To(Equal([]*types.Route{
 				{Dst: mustCIDR("0.0.0.0/0")},
@@ -206,7 +206,7 @@ var _ = Describe("static Operations", func() {
 					Gateway: net.ParseIP("10.10.0.254"),
 				}))
 
-			Expect(len(result.IPs)).To(Equal(1))
+			Expect(result.IPs).To(HaveLen(1))
 
 			Expect(result.Routes).To(Equal([]*types.Route{
 				{Dst: mustCIDR("0.0.0.0/0")},
@@ -272,7 +272,7 @@ var _ = Describe("static Operations", func() {
 					Gateway: nil,
 				}))
 
-			Expect(len(result.IPs)).To(Equal(2))
+			Expect(result.IPs).To(HaveLen(2))
 
 			// Release the IP
 			err = testutils.CmdDelWithArgs(args, func() error {
@@ -337,7 +337,7 @@ var _ = Describe("static Operations", func() {
 					Address: mustCIDR("3ffe:ffff:0:01ff::1/64"),
 				},
 			))
-			Expect(len(result.IPs)).To(Equal(2))
+			Expect(result.IPs).To(HaveLen(2))
 			Expect(result.Routes).To(Equal([]*types.Route{
 				{Dst: mustCIDR("0.0.0.0/0"), GW: net.ParseIP("10.10.0.254")},
 				{Dst: mustCIDR("3ffe:ffff:0:01ff::1/64"), GW: net.ParseIP("3ffe:ffff:0::1")},
@@ -407,7 +407,7 @@ var _ = Describe("static Operations", func() {
 					Address: mustCIDR("3ffe:ffff:0:01ff::1/64"),
 				},
 			))
-			Expect(len(result.IPs)).To(Equal(2))
+			Expect(result.IPs).To(HaveLen(2))
 			Expect(result.Routes).To(Equal([]*types.Route{
 				{Dst: mustCIDR("0.0.0.0/0"), GW: net.ParseIP("10.10.0.254")},
 				{Dst: mustCIDR("3ffe:ffff:0:01ff::1/64"), GW: net.ParseIP("3ffe:ffff:0::1")},
@@ -482,7 +482,7 @@ var _ = Describe("static Operations", func() {
 					Address: mustCIDR("3ffe:ffff:0:01ff::1/64"),
 				},
 			))
-			Expect(len(result.IPs)).To(Equal(2))
+			Expect(result.IPs).To(HaveLen(2))
 			Expect(result.Routes).To(Equal([]*types.Route{
 				{Dst: mustCIDR("0.0.0.0/0"), GW: net.ParseIP("10.10.0.254")},
 				{Dst: mustCIDR("3ffe:ffff:0:01ff::1/64"), GW: net.ParseIP("3ffe:ffff:0::1")},

plugins/linux_only.txt

@@ -6,6 +6,7 @@ plugins/main/loopback
 plugins/main/macvlan
 plugins/main/ptp
 plugins/main/vlan
+plugins/main/dummy
 plugins/meta/portmap
 plugins/meta/tuning
 plugins/meta/bandwidth

plugins/main/bridge/bridge.go

@@ -21,6 +21,7 @@ import (
 	"net"
 	"os"
 	"runtime"
+	"sort"
 	"syscall"
 	"time"
 
@@ -46,17 +47,19 @@ const defaultBrName = "cni0"
 
 type NetConf struct {
 	types.NetConf
-	BrName       string `json:"bridge"`
-	IsGW         bool   `json:"isGateway"`
-	IsDefaultGW  bool   `json:"isDefaultGateway"`
-	ForceAddress bool   `json:"forceAddress"`
-	IPMasq       bool   `json:"ipMasq"`
-	MTU          int    `json:"mtu"`
-	HairpinMode  bool   `json:"hairpinMode"`
-	PromiscMode  bool   `json:"promiscMode"`
-	Vlan         int    `json:"vlan"`
-	MacSpoofChk  bool   `json:"macspoofchk,omitempty"`
-	EnableDad    bool   `json:"enabledad,omitempty"`
+	BrName              string       `json:"bridge"`
+	IsGW                bool         `json:"isGateway"`
+	IsDefaultGW         bool         `json:"isDefaultGateway"`
+	ForceAddress        bool         `json:"forceAddress"`
+	IPMasq              bool         `json:"ipMasq"`
+	MTU                 int          `json:"mtu"`
+	HairpinMode         bool         `json:"hairpinMode"`
+	PromiscMode         bool         `json:"promiscMode"`
+	Vlan                int          `json:"vlan"`
+	VlanTrunk           []*VlanTrunk `json:"vlanTrunk,omitempty"`
+	PreserveDefaultVlan bool         `json:"preserveDefaultVlan"`
+	MacSpoofChk         bool         `json:"macspoofchk,omitempty"`
+	EnableDad           bool         `json:"enabledad,omitempty"`
 
 	Args struct {
 		Cni BridgeArgs `json:"cni,omitempty"`
@@ -65,7 +68,14 @@ type NetConf struct {
 		Mac string `json:"mac,omitempty"`
 	} `json:"runtimeConfig,omitempty"`
 
-	mac string
+	mac   string
+	vlans []int
+}
+
+type VlanTrunk struct {
+	MinID *int `json:"minID,omitempty"`
+	MaxID *int `json:"maxID,omitempty"`
+	ID    *int `json:"id,omitempty"`
 }
 
 type BridgeArgs struct {
@@ -94,6 +104,8 @@ func init() {
 func loadNetConf(bytes []byte, envArgs string) (*NetConf, string, error) {
 	n := &NetConf{
 		BrName: defaultBrName,
+		// Set default value equal to true to maintain existing behavior.
+		PreserveDefaultVlan: true,
 	}
 	if err := json.Unmarshal(bytes, n); err != nil {
 		return nil, "", fmt.Errorf("failed to load netconf: %v", err)
@@ -101,6 +113,17 @@ func loadNetConf(bytes []byte, envArgs string) (*NetConf, string, error) {
 	if n.Vlan < 0 || n.Vlan > 4094 {
 		return nil, "", fmt.Errorf("invalid VLAN ID %d (must be between 0 and 4094)", n.Vlan)
 	}
+	var err error
+	n.vlans, err = collectVlanTrunk(n.VlanTrunk)
+	if err != nil {
+		// fail to parsing
+		return nil, "", err
+	}
+
+	// Currently bridge CNI only support access port(untagged only) or trunk port(tagged only)
+	if n.Vlan > 0 && n.vlans != nil {
+		return nil, "", errors.New("cannot set vlan and vlanTrunk at the same time")
+	}
 
 	if envArgs != "" {
 		e := MacEnvArgs{}
@@ -124,12 +147,66 @@ func loadNetConf(bytes []byte, envArgs string) (*NetConf, string, error) {
 	return n, n.CNIVersion, nil
 }
 
+// This method is copied from https://github.com/k8snetworkplumbingwg/ovs-cni/blob/v0.27.2/pkg/plugin/plugin.go
+func collectVlanTrunk(vlanTrunk []*VlanTrunk) ([]int, error) {
+	if vlanTrunk == nil {
+		return nil, nil
+	}
+
+	vlanMap := make(map[int]struct{})
+	for _, item := range vlanTrunk {
+		var minID int
+		var maxID int
+		var ID int
+
+		switch {
+		case item.MinID != nil && item.MaxID != nil:
+			minID = *item.MinID
+			if minID <= 0 || minID > 4094 {
+				return nil, errors.New("incorrect trunk minID parameter")
+			}
+			maxID = *item.MaxID
+			if maxID <= 0 || maxID > 4094 {
+				return nil, errors.New("incorrect trunk maxID parameter")
+			}
+			if maxID < minID {
+				return nil, errors.New("minID is greater than maxID in trunk parameter")
+			}
+			for v := minID; v <= maxID; v++ {
+				vlanMap[v] = struct{}{}
+			}
+		case item.MinID == nil && item.MaxID != nil:
+			return nil, errors.New("minID and maxID should be configured simultaneously, minID is missing")
+		case item.MinID != nil && item.MaxID == nil:
+			return nil, errors.New("minID and maxID should be configured simultaneously, maxID is missing")
+		}
+
+		// single vid
+		if item.ID != nil {
+			ID = *item.ID
+			if ID <= 0 || ID > 4094 {
+				return nil, errors.New("incorrect trunk id parameter")
+			}
+			vlanMap[ID] = struct{}{}
+		}
+	}
+
+	if len(vlanMap) == 0 {
+		return nil, nil
+	}
+	vlans := make([]int, 0, len(vlanMap))
+	for k := range vlanMap {
+		vlans = append(vlans, k)
+	}
+	sort.Slice(vlans, func(i int, j int) bool { return vlans[i] < vlans[j] })
+	return vlans, nil
+}
+
 // calcGateways processes the results from the IPAM plugin and does the
 // following for each IP family:
-//    - Calculates and compiles a list of gateway addresses
-//    - Adds a default route if needed
+//   - Calculates and compiles a list of gateway addresses
+//   - Adds a default route if needed
 func calcGateways(result *current.Result, n *NetConf) (*gwInfo, *gwInfo, error) {
-
 	gwsV4 := &gwInfo{}
 	gwsV6 := &gwInfo{}
 
@@ -300,8 +377,8 @@ func ensureBridge(brName string, mtu int, promiscMode, vlanFiltering bool) (*net
 	return br, nil
 }
 
-func ensureVlanInterface(br *netlink.Bridge, vlanId int) (netlink.Link, error) {
-	name := fmt.Sprintf("%s.%d", br.Name, vlanId)
+func ensureVlanInterface(br *netlink.Bridge, vlanID int, preserveDefaultVlan bool) (netlink.Link, error) {
+	name := fmt.Sprintf("%s.%d", br.Name, vlanID)
 
 	brGatewayVeth, err := netlink.LinkByName(name)
 	if err != nil {
@@ -314,7 +391,7 @@ func ensureVlanInterface(br *netlink.Bridge, vlanId int) (netlink.Link, error) {
 			return nil, fmt.Errorf("faild to find host namespace: %v", err)
 		}
 
-		_, brGatewayIface, err := setupVeth(hostNS, br, name, br.MTU, false, vlanId, "")
+		_, brGatewayIface, err := setupVeth(hostNS, br, name, br.MTU, false, vlanID, nil, preserveDefaultVlan, "")
 		if err != nil {
 			return nil, fmt.Errorf("faild to create vlan gateway %q: %v", name, err)
 		}
@@ -333,7 +410,7 @@ func ensureVlanInterface(br *netlink.Bridge, vlanId int) (netlink.Link, error) {
 	return brGatewayVeth, nil
 }
 
-func setupVeth(netns ns.NetNS, br *netlink.Bridge, ifName string, mtu int, hairpinMode bool, vlanID int, mac string) (*current.Interface, *current.Interface, error) {
+func setupVeth(netns ns.NetNS, br *netlink.Bridge, ifName string, mtu int, hairpinMode bool, vlanID int, vlans []int, preserveDefaultVlan bool, mac string) (*current.Interface, *current.Interface, error) {
 	contIface := &current.Interface{}
 	hostIface := &current.Interface{}
 
@@ -370,6 +447,14 @@ func setupVeth(netns ns.NetNS, br *netlink.Bridge, ifName string, mtu int, hairp
 		return nil, nil, fmt.Errorf("failed to setup hairpin mode for %v: %v", hostVeth.Attrs().Name, err)
 	}
 
+	if (vlanID != 0 || len(vlans) > 0) && !preserveDefaultVlan {
+		err = removeDefaultVlan(hostVeth)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to remove default vlan on interface %q: %v", hostIface.Name, err)
+		}
+	}
+
+	// Currently bridge CNI only support access port(untagged only) or trunk port(tagged only)
 	if vlanID != 0 {
 		err = netlink.BridgeVlanAdd(hostVeth, uint16(vlanID), true, true, false, true)
 		if err != nil {
@@ -377,9 +462,35 @@ func setupVeth(netns ns.NetNS, br *netlink.Bridge, ifName string, mtu int, hairp
 		}
 	}
 
+	for _, v := range vlans {
+		err = netlink.BridgeVlanAdd(hostVeth, uint16(v), false, false, false, true)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to setup vlan tag on interface %q: %w", hostIface.Name, err)
+		}
+	}
+
 	return hostIface, contIface, nil
 }
 
+func removeDefaultVlan(hostVeth netlink.Link) error {
+	vlanInfo, err := netlink.BridgeVlanList()
+	if err != nil {
+		return err
+	}
+
+	brVlanInfo, ok := vlanInfo[int32(hostVeth.Attrs().Index)]
+	if ok {
+		for _, info := range brVlanInfo {
+			err = netlink.BridgeVlanDel(hostVeth, info.Vid, false, false, false, true)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
 func calcGatewayIP(ipn *net.IPNet) net.IP {
 	nid := ipn.IP.Mask(ipn.Mask)
 	return ip.NextIP(nid)
@@ -387,7 +498,7 @@ func calcGatewayIP(ipn *net.IPNet) net.IP {
 
 func setupBridge(n *NetConf) (*netlink.Bridge, *current.Interface, error) {
 	vlanFiltering := false
-	if n.Vlan != 0 {
+	if n.Vlan != 0 || n.VlanTrunk != nil {
 		vlanFiltering = true
 	}
 	// create bridge if necessary
@@ -410,7 +521,7 @@ func enableIPForward(family int) error {
 }
 
 func cmdAdd(args *skel.CmdArgs) error {
-	var success bool = false
+	success := false
 
 	n, cniVersion, err := loadNetConf(args.StdinData, args.Args)
 	if err != nil {
@@ -424,7 +535,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 	}
 
 	if n.HairpinMode && n.PromiscMode {
-		return fmt.Errorf("cannot set hairpin mode and promiscuous mode at the same time.")
+		return fmt.Errorf("cannot set hairpin mode and promiscuous mode at the same time")
 	}
 
 	br, brInterface, err := setupBridge(n)
@@ -438,7 +549,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 	}
 	defer netns.Close()
 
-	hostInterface, containerInterface, err := setupVeth(netns, br, args.IfName, n.MTU, n.HairpinMode, n.Vlan, n.mac)
+	hostInterface, containerInterface, err := setupVeth(netns, br, args.IfName, n.MTU, n.HairpinMode, n.Vlan, n.vlans, n.PreserveDefaultVlan, n.mac)
 	if err != nil {
 		return err
 	}
@@ -489,6 +600,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 		result.IPs = ipamResult.IPs
 		result.Routes = ipamResult.Routes
+		result.DNS = ipamResult.DNS
 
 		if len(result.IPs) == 0 {
 			return errors.New("IPAM plugin returned missing IP config")
@@ -511,50 +623,27 @@ func cmdAdd(args *skel.CmdArgs) error {
 			_, _ = sysctl.Sysctl(fmt.Sprintf("net/ipv4/conf/%s/arp_notify", args.IfName), "1")
 
 			// Add the IP to the interface
-			if err := ipam.ConfigureIface(args.IfName, result); err != nil {
-				return err
-			}
-			return nil
+			return ipam.ConfigureIface(args.IfName, result)
 		}); err != nil {
 			return err
 		}
 
-		// check bridge port state
-		retries := []int{0, 50, 500, 1000, 1000}
-		for idx, sleep := range retries {
-			time.Sleep(time.Duration(sleep) * time.Millisecond)
-
-			hostVeth, err := netlink.LinkByName(hostInterface.Name)
-			if err != nil {
-				return err
-			}
-			if hostVeth.Attrs().OperState == netlink.OperUp {
-				break
-			}
-
-			if idx == len(retries)-1 {
-				return fmt.Errorf("bridge port in error state: %s", hostVeth.Attrs().OperState)
-			}
-		}
-
 		if n.IsGW {
-			var firstV4Addr net.IP
 			var vlanInterface *current.Interface
 			// Set the IP address(es) on the bridge and enable forwarding
 			for _, gws := range []*gwInfo{gwsV4, gwsV6} {
 				for _, gw := range gws.gws {
-					if gw.IP.To4() != nil && firstV4Addr == nil {
-						firstV4Addr = gw.IP
-					}
 					if n.Vlan != 0 {
-						vlanIface, err := ensureVlanInterface(br, n.Vlan)
+						vlanIface, err := ensureVlanInterface(br, n.Vlan, n.PreserveDefaultVlan)
 						if err != nil {
 							return fmt.Errorf("failed to create vlan interface: %v", err)
 						}
 
 						if vlanInterface == nil {
-							vlanInterface = &current.Interface{Name: vlanIface.Attrs().Name,
-								Mac: vlanIface.Attrs().HardwareAddr.String()}
+							vlanInterface = &current.Interface{
+								Name: vlanIface.Attrs().Name,
+								Mac:  vlanIface.Attrs().HardwareAddr.String(),
+							}
 							result.Interfaces = append(result.Interfaces, vlanInterface)
 						}
 
@@ -603,6 +692,29 @@ func cmdAdd(args *skel.CmdArgs) error {
 		}
 	}
 
+	var hostVeth netlink.Link
+
+	// check bridge port state
+	retries := []int{0, 50, 500, 1000, 1000}
+	for idx, sleep := range retries {
+		time.Sleep(time.Duration(sleep) * time.Millisecond)
+
+		hostVeth, err = netlink.LinkByName(hostInterface.Name)
+		if err != nil {
+			return err
+		}
+		if hostVeth.Attrs().OperState == netlink.OperUp {
+			break
+		}
+
+		if idx == len(retries)-1 {
+			return fmt.Errorf("bridge port in error state: %s", hostVeth.Attrs().OperState)
+		}
+	}
+
+	// In certain circumstances, the host-side of the veth may change addrs
+	hostInterface.Mac = hostVeth.Attrs().HardwareAddr.String()
+
 	// Refetch the bridge since its MAC address may change when the first
 	// veth is added or after its IP address is set
 	br, err = bridgeByName(n.BrName)
@@ -611,18 +723,29 @@ func cmdAdd(args *skel.CmdArgs) error {
 	}
 	brInterface.Mac = br.Attrs().HardwareAddr.String()
 
-	result.DNS = n.DNS
-
 	// Return an error requested by testcases, if any
 	if debugPostIPAMError != nil {
 		return debugPostIPAMError
 	}
 
+	// Use incoming DNS settings if provided, otherwise use the
+	// settings that were already configured by the IPAM plugin
+	if dnsConfSet(n.DNS) {
+		result.DNS = n.DNS
+	}
+
 	success = true
 
 	return types.PrintResult(result, cniVersion)
 }
 
+func dnsConfSet(dnsConf types.DNS) bool {
+	return dnsConf.Nameservers != nil ||
+		dnsConf.Search != nil ||
+		dnsConf.Options != nil ||
+		dnsConf.Domain != ""
+}
+
 func cmdDel(args *skel.CmdArgs) error {
 	n, _, err := loadNetConf(args.StdinData, args.Args)
 	if err != nil {
@@ -631,14 +754,17 @@ func cmdDel(args *skel.CmdArgs) error {
 
 	isLayer3 := n.IPAM.Type != ""
 
-	if isLayer3 {
-		if err := ipam.ExecDel(n.IPAM.Type, args.StdinData); err != nil {
-			return err
+	ipamDel := func() error {
+		if isLayer3 {
+			if err := ipam.ExecDel(n.IPAM.Type, args.StdinData); err != nil {
+				return err
+			}
 		}
+		return nil
 	}
 
 	if args.Netns == "" {
-		return nil
+		return ipamDel()
 	}
 
 	// There is a netns so try to clean up. Delete can be called multiple times
@@ -660,11 +786,16 @@ func cmdDel(args *skel.CmdArgs) error {
 		// https://github.com/kubernetes/kubernetes/issues/43014#issuecomment-287164444
 		_, ok := err.(ns.NSPathNotExistErr)
 		if ok {
-			return nil
+			return ipamDel()
 		}
 		return err
 	}
 
+	// call ipam.ExecDel after clean up device in netns
+	if err := ipamDel(); err != nil {
+		return err
+	}
+
 	if n.MacSpoofChk {
 		sc := link.NewSpoofChecker("", "", uniqueID(args.ContainerID, args.IfName))
 		if err := sc.Teardown(); err != nil {
@@ -698,7 +829,6 @@ type cniBridgeIf struct {
 }
 
 func validateInterface(intf current.Interface, expectInSb bool) (cniBridgeIf, netlink.Link, error) {
-
 	ifFound := cniBridgeIf{found: false}
 	if intf.Name == "" {
 		return ifFound, nil, fmt.Errorf("Interface name missing ")
@@ -723,7 +853,6 @@ func validateInterface(intf current.Interface, expectInSb bool) (cniBridgeIf, ne
 }
 
 func validateCniBrInterface(intf current.Interface, n *NetConf) (cniBridgeIf, error) {
-
 	brFound, link, err := validateInterface(intf, false)
 	if err != nil {
 		return brFound, err
@@ -755,7 +884,6 @@ func validateCniBrInterface(intf current.Interface, n *NetConf) (cniBridgeIf, er
 }
 
 func validateCniVethInterface(intf *current.Interface, brIf cniBridgeIf, contIf cniBridgeIf) (cniBridgeIf, error) {
-
 	vethFound, link, err := validateInterface(*intf, false)
 	if err != nil {
 		return vethFound, err
@@ -799,7 +927,6 @@ func validateCniVethInterface(intf *current.Interface, brIf cniBridgeIf, contIf
 }
 
 func validateCniContainerInterface(intf current.Interface) (cniBridgeIf, error) {
-
 	vethFound, link, err := validateInterface(intf, true)
 	if err != nil {
 		return vethFound, err
@@ -828,7 +955,6 @@ func validateCniContainerInterface(intf current.Interface) (cniBridgeIf, error)
 }
 
 func cmdCheck(args *skel.CmdArgs) error {
-
 	n, _, err := loadNetConf(args.StdinData, args.Args)
 	if err != nil {
 		return err
@@ -935,7 +1061,7 @@ func cmdCheck(args *skel.CmdArgs) error {
 	}
 
 	// Check prevResults for ips, routes and dns against values found in the container
-	if err := netns.Do(func(_ ns.NetNS) error {
+	return netns.Do(func(_ ns.NetNS) error {
 		err = ip.ValidateExpectedInterfaceIPs(args.IfName, result.IPs)
 		if err != nil {
 			return err
@@ -946,11 +1072,7 @@ func cmdCheck(args *skel.CmdArgs) error {
 			return err
 		}
 		return nil
-	}); err != nil {
-		return err
-	}
-
-	return nil
+	})
 }
 
 func uniqueID(containerID, cniIface string) string {

plugins/main/bridge/bridge_suite_test.go

@@ -15,13 +15,26 @@
 package main
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var (
+	resolvConf string
+	err        error
 )
 
 func TestBridge(t *testing.T) {
 	RegisterFailHandler(Fail)
+
+	resolvConf, err = newResolvConf()
+	Expect(err).NotTo(HaveOccurred())
+
 	RunSpecs(t, "plugins/main/bridge")
 }
+
+var _ = AfterSuite(func() {
+	deleteResolvConf(resolvConf)
+})

plugins/main/bridge/bridge_test.go

@@ -17,13 +17,15 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"strings"
 
 	"github.com/coreos/go-iptables/iptables"
 	"github.com/networkplumbing/go-nft/nft"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
 	"github.com/vishvananda/netlink/nl"
 
 	"github.com/containernetworking/cni/pkg/skel"
@@ -33,18 +35,14 @@ import (
 	"github.com/containernetworking/plugins/pkg/ip"
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
-
-	"github.com/vishvananda/netlink"
-
 	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
 )
 
 const (
 	BRNAME     = "bridge0"
 	BRNAMEVLAN = "bridge0.100"
 	IFNAME     = "eth0"
+	NAMESERVER = "192.0.2.0"
 )
 
 type Net struct {
@@ -53,10 +51,11 @@ type Net struct {
 	Type       string                `json:"type,omitempty"`
 	BrName     string                `json:"bridge"`
 	IPAM       *allocator.IPAMConfig `json:"ipam"`
-	//RuntimeConfig struct {    // The capability arg
+	// RuntimeConfig struct {    // The capability arg
 	//	IPRanges []RangeSet `json:"ipRanges,omitempty"`
-	//} `json:"runtimeConfig,omitempty"`
-	//Args *struct {
+	// Args *struct {
+	// } `json:"runtimeConfig,omitempty"`
+
 	//	A *IPAMArgs `json:"cni"`
 	DNS           types.DNS              `json:"dns"`
 	RawPrevResult map[string]interface{} `json:"prevResult,omitempty"`
@@ -66,20 +65,23 @@ type Net struct {
 // testCase defines the CNI network configuration and the expected
 // bridge addresses for a test case.
 type testCase struct {
-	cniVersion  string      // CNI Version
-	subnet      string      // Single subnet config: Subnet CIDR
-	gateway     string      // Single subnet config: Gateway
-	ranges      []rangeInfo // Ranges list (multiple subnets config)
-	isGW        bool
-	isLayer2    bool
-	expGWCIDRs  []string // Expected gateway addresses in CIDR form
-	vlan        int
-	ipMasq      bool
-	macspoofchk bool
-	AddErr020   string
-	DelErr020   string
-	AddErr010   string
-	DelErr010   string
+	cniVersion        string      // CNI Version
+	subnet            string      // Single subnet config: Subnet CIDR
+	gateway           string      // Single subnet config: Gateway
+	ranges            []rangeInfo // Ranges list (multiple subnets config)
+	resolvConf        string      // host-local resolvConf file path
+	isGW              bool
+	isLayer2          bool
+	expGWCIDRs        []string // Expected gateway addresses in CIDR form
+	vlan              int
+	vlanTrunk         []*VlanTrunk
+	removeDefaultVlan bool
+	ipMasq            bool
+	macspoofchk       bool
+	AddErr020         string
+	DelErr020         string
+	AddErr010         string
+	DelErr010         string
 
 	envArgs       string // CNI_ARGS
 	runtimeConfig struct {
@@ -129,6 +131,26 @@ const (
 	vlan = `,
 	"vlan": %d`
 
+	vlanTrunkStartStr = `,
+	"vlanTrunk": [`
+
+	vlanTrunk = `
+	{
+		"id": %d
+	}`
+
+	vlanTrunkRange = `
+	{
+		"minID": %d,
+		"maxID": %d
+	}`
+
+	vlanTrunkEndStr = `
+	]`
+
+	preserveDefaultVlan = `,
+	"preserveDefaultVlan": false`
+
 	netDefault = `,
 	"isDefaultGateway": true`
 
@@ -139,6 +161,9 @@ const (
 	ipamDataDirStr = `,
         "dataDir": "%s"`
 
+	ipamResolvConfStr = `,
+		"resolvConf": "%s"`
+
 	ipMasqConfStr = `,
 	"ipMasq": %t`
 
@@ -188,7 +213,28 @@ func (tc testCase) netConfJSON(dataDir string) string {
 	conf := fmt.Sprintf(netConfStr, tc.cniVersion, BRNAME)
 	if tc.vlan != 0 {
 		conf += fmt.Sprintf(vlan, tc.vlan)
+
+		if tc.removeDefaultVlan {
+			conf += preserveDefaultVlan
+		}
 	}
+
+	if tc.isLayer2 && tc.vlanTrunk != nil {
+		conf += vlanTrunkStartStr
+		for i, vlan := range tc.vlanTrunk {
+			if i > 0 {
+				conf += ","
+			}
+			if vlan.ID != nil {
+				conf += fmt.Sprintf(vlanTrunk, *vlan.ID)
+			}
+			if vlan.MinID != nil && vlan.MaxID != nil {
+				conf += fmt.Sprintf(vlanTrunkRange, *vlan.MinID, *vlan.MaxID)
+			}
+		}
+		conf += vlanTrunkEndStr
+	}
+
 	if tc.ipMasq {
 		conf += tc.ipMasqConfig()
 	}
@@ -215,6 +261,9 @@ func (tc testCase) netConfJSON(dataDir string) string {
 			if tc.ranges != nil {
 				conf += tc.rangesConfig()
 			}
+			if tc.resolvConf != "" {
+				conf += tc.resolvConfConfig()
+			}
 			conf += ipamEndStr
 		}
 	} else {
@@ -252,13 +301,33 @@ func (tc testCase) rangesConfig() string {
 	return conf + rangesEndStr
 }
 
+func (tc testCase) resolvConfConfig() string {
+	conf := fmt.Sprintf(ipamResolvConfStr, tc.resolvConf)
+	return conf
+}
+
+func newResolvConf() (string, error) {
+	f, err := os.CreateTemp("", "host_local_resolv")
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+	name := f.Name()
+	_, err = f.WriteString(fmt.Sprintf("nameserver %s", NAMESERVER))
+	return name, err
+}
+
+func deleteResolvConf(path string) error {
+	return os.Remove(path)
+}
+
 var counter uint
 
 // createCmdArgs generates network configuration and creates command
 // arguments for a test case.
 func (tc testCase) createCmdArgs(targetNS ns.NetNS, dataDir string) *skel.CmdArgs {
 	conf := tc.netConfJSON(dataDir)
-	//defer func() { counter += 1 }()
+	// defer func() { counter += 1 }()
 	return &skel.CmdArgs{
 		ContainerID: fmt.Sprintf("dummy-%d", counter),
 		Netns:       targetNS.Path(),
@@ -270,18 +339,17 @@ func (tc testCase) createCmdArgs(targetNS ns.NetNS, dataDir string) *skel.CmdArg
 
 // createCheckCmdArgs generates network configuration and creates command
 // arguments for a Check test case.
-func (tc testCase) createCheckCmdArgs(targetNS ns.NetNS, config *Net, dataDir string) *skel.CmdArgs {
-
+func (tc testCase) createCheckCmdArgs(targetNS ns.NetNS, config *Net) *skel.CmdArgs {
 	conf, err := json.Marshal(config)
 	Expect(err).NotTo(HaveOccurred())
 
 	// TODO Don't we need to use the same counter as before?
-	//defer func() { counter += 1 }()
+	// defer func() { counter += 1 }()
 	return &skel.CmdArgs{
 		ContainerID: fmt.Sprintf("dummy-%d", counter),
 		Netns:       targetNS.Path(),
 		IfName:      IFNAME,
-		StdinData:   []byte(conf),
+		StdinData:   conf,
 	}
 }
 
@@ -369,25 +437,25 @@ func ipVersion(ip net.IP) string {
 
 func countIPAMIPs(path string) (int, error) {
 	count := 0
-	files, err := ioutil.ReadDir(path)
+	entries, err := os.ReadDir(path)
 	if err != nil {
 		return -1, err
 	}
-	for _, file := range files {
-		if file.IsDir() {
+	for _, entry := range entries {
+		if entry.IsDir() {
 			continue
 		}
 
-		if net.ParseIP(file.Name()) != nil {
+		if net.ParseIP(entry.Name()) != nil {
 			count++
 		}
 	}
 	return count, nil
 }
 
-func checkVlan(vlanId int, bridgeVlanInfo []*nl.BridgeVlanInfo) bool {
+func checkVlan(vlanID int, bridgeVlanInfo []*nl.BridgeVlanInfo) bool {
 	for _, vlan := range bridgeVlanInfo {
-		if vlan.Vid == uint16(vlanId) {
+		if vlan.Vid == uint16(vlanID) {
 			return true
 		}
 	}
@@ -408,10 +476,12 @@ type testerBase struct {
 	vethName string
 }
 
-type testerV10x testerBase
-type testerV04x testerBase
-type testerV03x testerBase
-type testerV01xOr02x testerBase
+type (
+	testerV10x      testerBase
+	testerV04x      testerBase
+	testerV03x      testerBase
+	testerV01xOr02x testerBase
+)
 
 func newTesterByVersion(version string, testNS, targetNS ns.NetNS) cmdAddDelTester {
 	switch {
@@ -458,9 +528,9 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 		result = resultType.(*types100.Result)
 
 		if !tc.isLayer2 && tc.vlan != 0 {
-			Expect(len(result.Interfaces)).To(Equal(4))
+			Expect(result.Interfaces).To(HaveLen(4))
 		} else {
-			Expect(len(result.Interfaces)).To(Equal(3))
+			Expect(result.Interfaces).To(HaveLen(3))
 		}
 
 		Expect(result.Interfaces[0].Name).To(Equal(BRNAME))
@@ -500,13 +570,16 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			vlans, isExist := interfaceMap[int32(peerLink.Attrs().Index)]
 			Expect(isExist).To(BeTrue())
 			Expect(checkVlan(tc.vlan, vlans)).To(BeTrue())
+			if tc.removeDefaultVlan {
+				Expect(vlans).To(HaveLen(1))
+			}
 		}
 
 		// Check the bridge vlan filtering equals true
-		if tc.vlan != 0 {
-			Expect(*link.(*netlink.Bridge).VlanFiltering).To(Equal(true))
+		if tc.vlan != 0 || tc.vlanTrunk != nil {
+			Expect(*link.(*netlink.Bridge).VlanFiltering).To(BeTrue())
 		} else {
-			Expect(*link.(*netlink.Bridge).VlanFiltering).To(Equal(false))
+			Expect(*link.(*netlink.Bridge).VlanFiltering).To(BeFalse())
 		}
 
 		// Ensure bridge has expected gateway address(es)
@@ -517,7 +590,7 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			addrs, err = netlink.AddrList(vlanLink, netlink.FAMILY_ALL)
 		}
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(BeNumerically(">", 0))
+		Expect(addrs).ToNot(BeEmpty())
 		for _, cidr := range tc.expGWCIDRs {
 			ip, subnet, err := net.ParseCIDR(cidr)
 			Expect(err).NotTo(HaveOccurred())
@@ -531,16 +604,16 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 					break
 				}
 			}
-			Expect(found).To(Equal(true), fmt.Sprintf("failed to find %s", cidr))
+			Expect(found).To(BeTrue(), fmt.Sprintf("failed to find %s", cidr))
 		}
 
 		// Check for the veth link in the main namespace
 		links, err := netlink.LinkList()
 		Expect(err).NotTo(HaveOccurred())
 		if !tc.isLayer2 && tc.vlan != 0 {
-			Expect(len(links)).To(Equal(5)) // Bridge, Bridge vlan veth, veth, and loopback
+			Expect(links).To(HaveLen(5)) // Bridge, Bridge vlan veth, veth, and loopback
 		} else {
-			Expect(len(links)).To(Equal(3)) // Bridge, veth, and loopback
+			Expect(links).To(HaveLen(3)) // Bridge, veth, and loopback
 		}
 
 		link, err = netlink.LinkByName(result.Interfaces[1].Name)
@@ -555,6 +628,28 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			vlans, isExist := interfaceMap[int32(link.Attrs().Index)]
 			Expect(isExist).To(BeTrue())
 			Expect(checkVlan(tc.vlan, vlans)).To(BeTrue())
+			if tc.removeDefaultVlan {
+				Expect(vlans).To(HaveLen(1))
+			}
+		}
+
+		// check VlanTrunks exist on the veth interface
+		if tc.vlanTrunk != nil {
+			interfaceMap, err := netlink.BridgeVlanList()
+			Expect(err).NotTo(HaveOccurred())
+			vlans, isExist := interfaceMap[int32(link.Attrs().Index)]
+			Expect(isExist).To(BeTrue())
+
+			for _, vlanEntry := range tc.vlanTrunk {
+				if vlanEntry.ID != nil {
+					Expect(checkVlan(*vlanEntry.ID, vlans)).To(BeTrue())
+				}
+				if vlanEntry.MinID != nil && vlanEntry.MaxID != nil {
+					for vid := *vlanEntry.MinID; vid <= *vlanEntry.MaxID; vid++ {
+						Expect(checkVlan(vid, vlans)).To(BeTrue())
+					}
+				}
+			}
 		}
 
 		// Check that the bridge has a different mac from the veth
@@ -565,6 +660,11 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			Expect(link.Attrs().HardwareAddr.String()).NotTo(Equal(bridgeMAC))
 		}
 
+		// Check that resolvConf was used properly
+		if !tc.isLayer2 && tc.resolvConf != "" {
+			Expect(result.DNS.Nameservers).To(Equal([]string{NAMESERVER}))
+		}
+
 		return nil
 	})
 	Expect(err).NotTo(HaveOccurred())
@@ -581,9 +681,9 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 		expCIDRsV4, expCIDRsV6 := tc.expectedCIDRs()
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(Equal(len(expCIDRsV4)))
+		Expect(addrs).To(HaveLen(len(expCIDRsV4)))
 		addrs, err = netlink.AddrList(link, netlink.FAMILY_V6)
-		Expect(len(addrs)).To(Equal(len(expCIDRsV6) + 1)) //add one for the link-local
+		Expect(addrs).To(HaveLen(len(expCIDRsV6) + 1)) // add one for the link-local
 		Expect(err).NotTo(HaveOccurred())
 		// Ignore link local address which may or may not be
 		// ready when we read addresses.
@@ -618,7 +718,7 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 					break
 				}
 			}
-			Expect(*found).To(Equal(true))
+			Expect(*found).To(BeTrue())
 		}
 
 		return nil
@@ -628,9 +728,9 @@ func (tester *testerV10x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 	return result, nil
 }
 
-func (tester *testerV10x) cmdCheckTest(tc testCase, conf *Net, dataDir string) {
+func (tester *testerV10x) cmdCheckTest(tc testCase, conf *Net, _ string) {
 	// Generate network config and command arguments
-	tester.args = tc.createCheckCmdArgs(tester.targetNS, conf, dataDir)
+	tester.args = tc.createCheckCmdArgs(tester.targetNS, conf)
 
 	// Execute cmdCHECK on the plugin
 	err := tester.testNS.Do(func(ns.NetNS) error {
@@ -657,9 +757,9 @@ func (tester *testerV10x) cmdCheckTest(tc testCase, conf *Net, dataDir string) {
 		expCIDRsV4, expCIDRsV6 := tc.expectedCIDRs()
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(Equal(len(expCIDRsV4)))
+		Expect(addrs).To(HaveLen(len(expCIDRsV4)))
 		addrs, err = netlink.AddrList(link, netlink.FAMILY_V6)
-		Expect(len(addrs)).To(Equal(len(expCIDRsV6) + 1)) //add one for the link-local
+		Expect(addrs).To(HaveLen(len(expCIDRsV6) + 1)) // add one for the link-local
 		Expect(err).NotTo(HaveOccurred())
 		// Ignore link local address which may or may not be
 		// ready when we read addresses.
@@ -694,7 +794,7 @@ func (tester *testerV10x) cmdCheckTest(tc testCase, conf *Net, dataDir string) {
 					break
 				}
 			}
-			Expect(*found).To(Equal(true))
+			Expect(*found).To(BeTrue())
 		}
 
 		return nil
@@ -758,9 +858,9 @@ func (tester *testerV04x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 		result = resultType.(*types040.Result)
 
 		if !tc.isLayer2 && tc.vlan != 0 {
-			Expect(len(result.Interfaces)).To(Equal(4))
+			Expect(result.Interfaces).To(HaveLen(4))
 		} else {
-			Expect(len(result.Interfaces)).To(Equal(3))
+			Expect(result.Interfaces).To(HaveLen(3))
 		}
 
 		Expect(result.Interfaces[0].Name).To(Equal(BRNAME))
@@ -800,13 +900,16 @@ func (tester *testerV04x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			vlans, isExist := interfaceMap[int32(peerLink.Attrs().Index)]
 			Expect(isExist).To(BeTrue())
 			Expect(checkVlan(tc.vlan, vlans)).To(BeTrue())
+			if tc.removeDefaultVlan {
+				Expect(vlans).To(HaveLen(1))
+			}
 		}
 
 		// Check the bridge vlan filtering equals true
-		if tc.vlan != 0 {
-			Expect(*link.(*netlink.Bridge).VlanFiltering).To(Equal(true))
+		if tc.vlan != 0 || tc.vlanTrunk != nil {
+			Expect(*link.(*netlink.Bridge).VlanFiltering).To(BeTrue())
 		} else {
-			Expect(*link.(*netlink.Bridge).VlanFiltering).To(Equal(false))
+			Expect(*link.(*netlink.Bridge).VlanFiltering).To(BeFalse())
 		}
 
 		// Ensure bridge has expected gateway address(es)
@@ -817,7 +920,7 @@ func (tester *testerV04x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			addrs, err = netlink.AddrList(vlanLink, netlink.FAMILY_ALL)
 		}
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(BeNumerically(">", 0))
+		Expect(addrs).ToNot(BeEmpty())
 		for _, cidr := range tc.expGWCIDRs {
 			ip, subnet, err := net.ParseCIDR(cidr)
 			Expect(err).NotTo(HaveOccurred())
@@ -831,16 +934,16 @@ func (tester *testerV04x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 					break
 				}
 			}
-			Expect(found).To(Equal(true))
+			Expect(found).To(BeTrue())
 		}
 
 		// Check for the veth link in the main namespace
 		links, err := netlink.LinkList()
 		Expect(err).NotTo(HaveOccurred())
 		if !tc.isLayer2 && tc.vlan != 0 {
-			Expect(len(links)).To(Equal(5)) // Bridge, Bridge vlan veth, veth, and loopback
+			Expect(links).To(HaveLen(5)) // Bridge, Bridge vlan veth, veth, and loopback
 		} else {
-			Expect(len(links)).To(Equal(3)) // Bridge, veth, and loopback
+			Expect(links).To(HaveLen(3)) // Bridge, veth, and loopback
 		}
 
 		link, err = netlink.LinkByName(result.Interfaces[1].Name)
@@ -855,6 +958,28 @@ func (tester *testerV04x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			vlans, isExist := interfaceMap[int32(link.Attrs().Index)]
 			Expect(isExist).To(BeTrue())
 			Expect(checkVlan(tc.vlan, vlans)).To(BeTrue())
+			if tc.removeDefaultVlan {
+				Expect(vlans).To(HaveLen(1))
+			}
+		}
+
+		// check VlanTrunks exist on the veth interface
+		if tc.vlanTrunk != nil {
+			interfaceMap, err := netlink.BridgeVlanList()
+			Expect(err).NotTo(HaveOccurred())
+			vlans, isExist := interfaceMap[int32(link.Attrs().Index)]
+			Expect(isExist).To(BeTrue())
+
+			for _, vlanEntry := range tc.vlanTrunk {
+				if vlanEntry.ID != nil {
+					Expect(checkVlan(*vlanEntry.ID, vlans)).To(BeTrue())
+				}
+				if vlanEntry.MinID != nil && vlanEntry.MaxID != nil {
+					for vid := *vlanEntry.MinID; vid <= *vlanEntry.MaxID; vid++ {
+						Expect(checkVlan(vid, vlans)).To(BeTrue())
+					}
+				}
+			}
 		}
 
 		// Check that the bridge has a different mac from the veth
@@ -881,9 +1006,9 @@ func (tester *testerV04x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 		expCIDRsV4, expCIDRsV6 := tc.expectedCIDRs()
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(Equal(len(expCIDRsV4)))
+		Expect(addrs).To(HaveLen(len(expCIDRsV4)))
 		addrs, err = netlink.AddrList(link, netlink.FAMILY_V6)
-		Expect(len(addrs)).To(Equal(len(expCIDRsV6) + 1)) //add one for the link-local
+		Expect(addrs).To(HaveLen(len(expCIDRsV6) + 1)) // add one for the link-local
 		Expect(err).NotTo(HaveOccurred())
 		// Ignore link local address which may or may not be
 		// ready when we read addresses.
@@ -918,7 +1043,7 @@ func (tester *testerV04x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 					break
 				}
 			}
-			Expect(*found).To(Equal(true))
+			Expect(*found).To(BeTrue())
 		}
 
 		return nil
@@ -928,9 +1053,9 @@ func (tester *testerV04x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 	return result, nil
 }
 
-func (tester *testerV04x) cmdCheckTest(tc testCase, conf *Net, dataDir string) {
+func (tester *testerV04x) cmdCheckTest(tc testCase, conf *Net, _ string) {
 	// Generate network config and command arguments
-	tester.args = tc.createCheckCmdArgs(tester.targetNS, conf, dataDir)
+	tester.args = tc.createCheckCmdArgs(tester.targetNS, conf)
 
 	// Execute cmdCHECK on the plugin
 	err := tester.testNS.Do(func(ns.NetNS) error {
@@ -957,9 +1082,9 @@ func (tester *testerV04x) cmdCheckTest(tc testCase, conf *Net, dataDir string) {
 		expCIDRsV4, expCIDRsV6 := tc.expectedCIDRs()
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(Equal(len(expCIDRsV4)))
+		Expect(addrs).To(HaveLen(len(expCIDRsV4)))
 		addrs, err = netlink.AddrList(link, netlink.FAMILY_V6)
-		Expect(len(addrs)).To(Equal(len(expCIDRsV6) + 1)) //add one for the link-local
+		Expect(addrs).To(HaveLen(len(expCIDRsV6) + 1)) // add one for the link-local
 		Expect(err).NotTo(HaveOccurred())
 		// Ignore link local address which may or may not be
 		// ready when we read addresses.
@@ -994,7 +1119,7 @@ func (tester *testerV04x) cmdCheckTest(tc testCase, conf *Net, dataDir string) {
 					break
 				}
 			}
-			Expect(*found).To(Equal(true))
+			Expect(*found).To(BeTrue())
 		}
 
 		return nil
@@ -1058,9 +1183,9 @@ func (tester *testerV03x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 		result = resultType.(*types040.Result)
 
 		if !tc.isLayer2 && tc.vlan != 0 {
-			Expect(len(result.Interfaces)).To(Equal(4))
+			Expect(result.Interfaces).To(HaveLen(4))
 		} else {
-			Expect(len(result.Interfaces)).To(Equal(3))
+			Expect(result.Interfaces).To(HaveLen(3))
 		}
 
 		Expect(result.Interfaces[0].Name).To(Equal(BRNAME))
@@ -1100,13 +1225,16 @@ func (tester *testerV03x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			vlans, isExist := interfaceMap[int32(peerLink.Attrs().Index)]
 			Expect(isExist).To(BeTrue())
 			Expect(checkVlan(tc.vlan, vlans)).To(BeTrue())
+			if tc.removeDefaultVlan {
+				Expect(vlans).To(HaveLen(1))
+			}
 		}
 
 		// Check the bridge vlan filtering equals true
-		if tc.vlan != 0 {
-			Expect(*link.(*netlink.Bridge).VlanFiltering).To(Equal(true))
+		if tc.vlan != 0 || tc.vlanTrunk != nil {
+			Expect(*link.(*netlink.Bridge).VlanFiltering).To(BeTrue())
 		} else {
-			Expect(*link.(*netlink.Bridge).VlanFiltering).To(Equal(false))
+			Expect(*link.(*netlink.Bridge).VlanFiltering).To(BeFalse())
 		}
 
 		// Ensure bridge has expected gateway address(es)
@@ -1117,7 +1245,7 @@ func (tester *testerV03x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			addrs, err = netlink.AddrList(vlanLink, netlink.FAMILY_ALL)
 		}
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(BeNumerically(">", 0))
+		Expect(addrs).ToNot(BeEmpty())
 		for _, cidr := range tc.expGWCIDRs {
 			ip, subnet, err := net.ParseCIDR(cidr)
 			Expect(err).NotTo(HaveOccurred())
@@ -1131,16 +1259,16 @@ func (tester *testerV03x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 					break
 				}
 			}
-			Expect(found).To(Equal(true))
+			Expect(found).To(BeTrue())
 		}
 
 		// Check for the veth link in the main namespace
 		links, err := netlink.LinkList()
 		Expect(err).NotTo(HaveOccurred())
 		if !tc.isLayer2 && tc.vlan != 0 {
-			Expect(len(links)).To(Equal(5)) // Bridge, Bridge vlan veth, veth, and loopback
+			Expect(links).To(HaveLen(5)) // Bridge, Bridge vlan veth, veth, and loopback
 		} else {
-			Expect(len(links)).To(Equal(3)) // Bridge, veth, and loopback
+			Expect(links).To(HaveLen(3)) // Bridge, veth, and loopback
 		}
 
 		link, err = netlink.LinkByName(result.Interfaces[1].Name)
@@ -1155,6 +1283,28 @@ func (tester *testerV03x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 			vlans, isExist := interfaceMap[int32(link.Attrs().Index)]
 			Expect(isExist).To(BeTrue())
 			Expect(checkVlan(tc.vlan, vlans)).To(BeTrue())
+			if tc.removeDefaultVlan {
+				Expect(vlans).To(HaveLen(1))
+			}
+		}
+
+		// check VlanTrunks exist on the veth interface
+		if tc.vlanTrunk != nil {
+			interfaceMap, err := netlink.BridgeVlanList()
+			Expect(err).NotTo(HaveOccurred())
+			vlans, isExist := interfaceMap[int32(link.Attrs().Index)]
+			Expect(isExist).To(BeTrue())
+
+			for _, vlanEntry := range tc.vlanTrunk {
+				if vlanEntry.ID != nil {
+					Expect(checkVlan(*vlanEntry.ID, vlans)).To(BeTrue())
+				}
+				if vlanEntry.MinID != nil && vlanEntry.MaxID != nil {
+					for vid := *vlanEntry.MinID; vid <= *vlanEntry.MaxID; vid++ {
+						Expect(checkVlan(vid, vlans)).To(BeTrue())
+					}
+				}
+			}
 		}
 
 		// Check that the bridge has a different mac from the veth
@@ -1181,7 +1331,7 @@ func (tester *testerV03x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 		expCIDRsV4, expCIDRsV6 := tc.expectedCIDRs()
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(Equal(len(expCIDRsV4)))
+		Expect(addrs).To(HaveLen(len(expCIDRsV4)))
 		addrs, err = netlink.AddrList(link, netlink.FAMILY_V6)
 		Expect(err).NotTo(HaveOccurred())
 		// Ignore link local address which may or may not be
@@ -1217,7 +1367,7 @@ func (tester *testerV03x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 					break
 				}
 			}
-			Expect(*found).To(Equal(true))
+			Expect(*found).To(BeTrue())
 		}
 
 		return nil
@@ -1226,11 +1376,10 @@ func (tester *testerV03x) cmdAddTest(tc testCase, dataDir string) (types.Result,
 	return result, nil
 }
 
-func (tester *testerV03x) cmdCheckTest(tc testCase, conf *Net, dataDir string) {
-	return
+func (tester *testerV03x) cmdCheckTest(_ testCase, _ *Net, _ string) {
 }
 
-func (tester *testerV03x) cmdDelTest(tc testCase, dataDir string) {
+func (tester *testerV03x) cmdDelTest(_ testCase, _ string) {
 	err := tester.testNS.Do(func(ns.NetNS) error {
 		defer GinkgoRecover()
 
@@ -1327,13 +1476,16 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 			vlans, isExist := interfaceMap[int32(peerLink.Attrs().Index)]
 			Expect(isExist).To(BeTrue())
 			Expect(checkVlan(tc.vlan, vlans)).To(BeTrue())
+			if tc.removeDefaultVlan {
+				Expect(vlans).To(HaveLen(1))
+			}
 		}
 
 		// Check the bridge vlan filtering equals true
 		if tc.vlan != 0 {
-			Expect(*link.(*netlink.Bridge).VlanFiltering).To(Equal(true))
+			Expect(*link.(*netlink.Bridge).VlanFiltering).To(BeTrue())
 		} else {
-			Expect(*link.(*netlink.Bridge).VlanFiltering).To(Equal(false))
+			Expect(*link.(*netlink.Bridge).VlanFiltering).To(BeFalse())
 		}
 
 		// Ensure bridge has expected gateway address(es)
@@ -1344,7 +1496,7 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 			addrs, err = netlink.AddrList(vlanLink, netlink.FAMILY_ALL)
 		}
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(BeNumerically(">", 0))
+		Expect(addrs).ToNot(BeEmpty())
 		for _, cidr := range tc.expGWCIDRs {
 			ip, subnet, err := net.ParseCIDR(cidr)
 			Expect(err).NotTo(HaveOccurred())
@@ -1358,7 +1510,7 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 					break
 				}
 			}
-			Expect(found).To(Equal(true))
+			Expect(found).To(BeTrue())
 		}
 
 		// Check for the veth link in the main namespace; can't
@@ -1367,9 +1519,9 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 		links, err := netlink.LinkList()
 		Expect(err).NotTo(HaveOccurred())
 		if !tc.isLayer2 && tc.vlan != 0 {
-			Expect(len(links)).To(Equal(5)) // Bridge, Bridge vlan veth, veth, and loopback
+			Expect(links).To(HaveLen(5)) // Bridge, Bridge vlan veth, veth, and loopback
 		} else {
-			Expect(len(links)).To(Equal(3)) // Bridge, veth, and loopback
+			Expect(links).To(HaveLen(3)) // Bridge, veth, and loopback
 		}
 
 		// Grab the vlan map in the host NS for checking later
@@ -1400,7 +1552,7 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 		expCIDRsV4, expCIDRsV6 := tc.expectedCIDRs()
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(Equal(len(expCIDRsV4)))
+		Expect(addrs).To(HaveLen(len(expCIDRsV4)))
 		addrs, err = netlink.AddrList(link, netlink.FAMILY_V6)
 		Expect(err).NotTo(HaveOccurred())
 		// Ignore link local address which may or may not be
@@ -1436,7 +1588,7 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 					break
 				}
 			}
-			Expect(*found).To(Equal(true))
+			Expect(*found).To(BeTrue())
 		}
 
 		// Validate VLAN in the host NS. Since 0.1.0/0.2.0 don't return
@@ -1449,6 +1601,9 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 			vlans, isExist := hostNSVlanMap[int32(peerIndex)]
 			Expect(isExist).To(BeTrue())
 			Expect(checkVlan(tc.vlan, vlans)).To(BeTrue())
+			if tc.removeDefaultVlan {
+				Expect(vlans).To(HaveLen(1))
+			}
 		}
 
 		return nil
@@ -1457,22 +1612,22 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 	return nil, nil
 }
 
-func (tester *testerV01xOr02x) cmdCheckTest(tc testCase, conf *Net, dataDir string) {
-	return
+func (tester *testerV01xOr02x) cmdCheckTest(_ testCase, _ *Net, _ string) {
 }
 
-func (tester *testerV01xOr02x) cmdDelTest(tc testCase, dataDir string) {
+func (tester *testerV01xOr02x) cmdDelTest(tc testCase, _ string) {
 	err := tester.testNS.Do(func(ns.NetNS) error {
 		defer GinkgoRecover()
 
 		err := testutils.CmdDelWithArgs(tester.args, func() error {
 			return cmdDel(tester.args)
 		})
-		if expect020DelError(tc) {
+		switch {
+		case expect020DelError(tc):
 			Expect(err).To(MatchError(tc.DelErr020))
-		} else if expect010DelError(tc) {
+		case expect010DelError(tc):
 			Expect(err).To(MatchError(tc.DelErr010))
-		} else {
+		default:
 			Expect(err).NotTo(HaveOccurred())
 		}
 		return nil
@@ -1545,7 +1700,6 @@ func buildOneConfig(name, cniVersion string, orig *Net, prevResult types.Result)
 	}
 
 	return conf, nil
-
 }
 
 func cmdAddDelCheckTest(origNS, targetNS ns.NetNS, tc testCase, dataDir string) {
@@ -1595,7 +1749,7 @@ var _ = Describe("bridge Operations", func() {
 		targetNS, err = testutils.NewNS()
 		Expect(err).NotTo(HaveOccurred())
 
-		dataDir, err = ioutil.TempDir("", "bridge_test")
+		dataDir, err = os.MkdirTemp("", "bridge_test")
 		Expect(err).NotTo(HaveOccurred())
 
 		// Do not emulate an error, each test will set this if needed
@@ -1610,6 +1764,61 @@ var _ = Describe("bridge Operations", func() {
 		Expect(testutils.UnmountNS(targetNS)).To(Succeed())
 	})
 
+	var (
+		correctID      int = 10
+		correctMinID   int = 100
+		correctMaxID   int = 105
+		incorrectMinID int = 1000
+		incorrectMaxID int = 100
+		overID         int = 5000
+		negativeID     int = -1
+	)
+
+	DescribeTable(
+		"collectVlanTrunk succeeds",
+		func(vlanTrunks []*VlanTrunk, expectedVIDs []int) {
+			Expect(collectVlanTrunk(vlanTrunks)).To(ConsistOf(expectedVIDs))
+		},
+		Entry("when provided an empty VLAN trunk configuration", []*VlanTrunk{}, nil),
+		Entry("when provided a VLAN trunk configuration with both min / max range", []*VlanTrunk{
+			{
+				MinID: &correctMinID,
+				MaxID: &correctMaxID,
+			},
+		}, []int{100, 101, 102, 103, 104, 105}),
+		Entry("when provided a VLAN trunk configuration with id only", []*VlanTrunk{
+			{
+				ID: &correctID,
+			},
+		}, []int{10}),
+		Entry("when provided a VLAN trunk configuration with id and range", []*VlanTrunk{
+			{
+				ID: &correctID,
+			},
+			{
+				MinID: &correctMinID,
+				MaxID: &correctMaxID,
+			},
+		}, []int{10, 100, 101, 102, 103, 104, 105}),
+	)
+
+	DescribeTable(
+		"collectVlanTrunk failed",
+		func(vlanTrunks []*VlanTrunk, expectedError error) {
+			_, err := collectVlanTrunk(vlanTrunks)
+			Expect(err).To(MatchError(expectedError))
+		},
+		Entry("when not passed the maxID", []*VlanTrunk{{MinID: &correctMinID}}, fmt.Errorf("minID and maxID should be configured simultaneously, maxID is missing")),
+		Entry("when not passed the minID", []*VlanTrunk{{MaxID: &correctMaxID}}, fmt.Errorf("minID and maxID should be configured simultaneously, minID is missing")),
+		Entry("when the minID is negative", []*VlanTrunk{{MinID: &negativeID, MaxID: &correctMaxID}}, fmt.Errorf("incorrect trunk minID parameter")),
+		Entry("when the minID is larger than 4094", []*VlanTrunk{{MinID: &overID, MaxID: &correctMaxID}}, fmt.Errorf("incorrect trunk minID parameter")),
+		Entry("when the maxID is larger than 4094", []*VlanTrunk{{MinID: &correctMinID, MaxID: &overID}}, fmt.Errorf("incorrect trunk maxID parameter")),
+		Entry("when the maxID is negative", []*VlanTrunk{{MinID: &correctMinID, MaxID: &overID}}, fmt.Errorf("incorrect trunk maxID parameter")),
+		Entry("when the ID is larger than 4094", []*VlanTrunk{{ID: &overID}}, fmt.Errorf("incorrect trunk id parameter")),
+		Entry("when the ID is negative", []*VlanTrunk{{ID: &negativeID}}, fmt.Errorf("incorrect trunk id parameter")),
+		Entry("when the maxID is smaller than minID", []*VlanTrunk{{MinID: &incorrectMinID, MaxID: &incorrectMaxID}}, fmt.Errorf("minID is greater than maxID in trunk parameter")),
+	)
+
 	for _, ver := range testutils.AllSpecVersions {
 		// Redefine ver inside for scope so real value is picked up by each dynamically defined It()
 		// See Gingkgo's "Patterns for dynamically generating tests" documentation.
@@ -1706,6 +1915,12 @@ var _ = Describe("bridge Operations", func() {
 				AddErr010: "CNI version 0.1.0 does not support more than 1 address per family",
 				DelErr010: "CNI version 0.1.0 does not support more than 1 address per family",
 			},
+			{
+				// with resolvConf DNS settings
+				subnet:     "10.1.2.0/24",
+				expGWCIDRs: []string{"10.1.2.1/24"},
+				resolvConf: resolvConf,
+			},
 		} {
 			tc := tc
 			i := i
@@ -1736,6 +1951,37 @@ var _ = Describe("bridge Operations", func() {
 			cmdAddDelTest(originalNS, targetNS, tc, dataDir)
 		})
 
+		// TODO find some way to put pointer
+		It(fmt.Sprintf("[%s] configures and deconfigures a l2 bridge with vlan id 100, vlanTrunk 101,200~210 using ADD/DEL", ver), func() {
+			id, minID, maxID := 101, 200, 210
+			tc := testCase{
+				cniVersion: ver,
+				isLayer2:   true,
+				vlanTrunk: []*VlanTrunk{
+					{ID: &id},
+					{
+						MinID: &minID,
+						MaxID: &maxID,
+					},
+				},
+				AddErr020: "cannot convert: no valid IP addresses",
+				AddErr010: "cannot convert: no valid IP addresses",
+			}
+			cmdAddDelTest(originalNS, targetNS, tc, dataDir)
+		})
+
+		It(fmt.Sprintf("[%s] configures and deconfigures a l2 bridge with vlan id 100 and no default vlan using ADD/DEL", ver), func() {
+			tc := testCase{
+				cniVersion:        ver,
+				isLayer2:          true,
+				vlan:              100,
+				removeDefaultVlan: true,
+				AddErr020:         "cannot convert: no valid IP addresses",
+				AddErr010:         "cannot convert: no valid IP addresses",
+			}
+			cmdAddDelTest(originalNS, targetNS, tc, dataDir)
+		})
+
 		for i, tc := range []testCase{
 			{
 				// IPv4 only
@@ -1786,6 +2032,11 @@ var _ = Describe("bridge Operations", func() {
 				tc.cniVersion = ver
 				cmdAddDelTest(originalNS, targetNS, tc, dataDir)
 			})
+			It(fmt.Sprintf("[%s] (%d) configures and deconfigures a bridge, veth with default route and vlanID 100 and no default vlan with ADD/DEL", ver, i), func() {
+				tc.cniVersion = ver
+				tc.removeDefaultVlan = true
+				cmdAddDelTest(originalNS, targetNS, tc, dataDir)
+			})
 		}
 
 		for i, tc := range []testCase{
@@ -1893,7 +2144,7 @@ var _ = Describe("bridge Operations", func() {
 					checkBridgeIPs := func(cidr0, cidr1 string) {
 						addrs, err := netlink.AddrList(bridge, family)
 						Expect(err).NotTo(HaveOccurred())
-						Expect(len(addrs)).To(Equal(expNumAddrs))
+						Expect(addrs).To(HaveLen(expNumAddrs))
 						addr := addrs[0].IPNet.String()
 						Expect(addr).To(Equal(cidr0))
 						if cidr1 != "" {
@@ -1903,7 +2154,7 @@ var _ = Describe("bridge Operations", func() {
 					}
 
 					// Check if ForceAddress has default value
-					Expect(conf.ForceAddress).To(Equal(false))
+					Expect(conf.ForceAddress).To(BeFalse())
 
 					// Set first address on bridge
 					err = ensureAddr(bridge, family, &gwnFirst, conf.ForceAddress)
@@ -1951,8 +2202,6 @@ var _ = Describe("bridge Operations", func() {
 
 		It(fmt.Sprintf("[%s] ensure promiscuous mode on bridge", ver), func() {
 			const IFNAME = "bridge0"
-			const EXPECTED_IP = "10.0.0.0/8"
-			const CHANGED_EXPECTED_IP = "10.1.2.3/16"
 
 			conf := &NetConf{
 				NetConf: types.NetConf{
@@ -1974,9 +2223,9 @@ var _ = Describe("bridge Operations", func() {
 				_, _, err := setupBridge(conf)
 				Expect(err).NotTo(HaveOccurred())
 				// Check if ForceAddress has default value
-				Expect(conf.ForceAddress).To(Equal(false))
+				Expect(conf.ForceAddress).To(BeFalse())
 
-				//Check if promiscuous mode is set correctly
+				// Check if promiscuous mode is set correctly
 				link, err := netlink.LinkByName("bridge0")
 				Expect(err).NotTo(HaveOccurred())
 
@@ -2241,7 +2490,7 @@ var _ = Describe("bridge Operations", func() {
 		for _, test := range tests {
 			_, _, err := loadNetConf([]byte(test.netConfJSON("")), "")
 			if test.err == nil {
-				Expect(err).To(BeNil())
+				Expect(err).ToNot(HaveOccurred())
 			} else {
 				Expect(err).To(Equal(test.err))
 			}

plugins/main/dummy/README.md

@@ -0,0 +1,39 @@
+---
+title: dummy plugin
+description: "plugins/main/dummy/README.md"
+date: 2022-05-12
+toc: true
+draft: true
+weight: 200
+---
+
+## Overview
+
+dummy is a useful feature for routing packets through the Linux kernel without transmitting.
+
+Like loopback, it is a purely virtual interface that allows packets to be routed to a designated IP address. Unlike loopback, the IP address can be arbitrary and is not restricted to the `127.0.0.0/8` range.
+
+## Example configuration
+
+```json
+{
+	"name": "mynet",
+	"type": "dummy",
+	"ipam": {
+		"type": "host-local",
+		"subnet": "10.1.2.0/24"
+	}
+}
+```
+
+## Network configuration reference
+
+* `name` (string, required): the name of the network.
+* `type` (string, required): "dummy".
+* `ipam` (dictionary, required): IPAM configuration to be used for this network.
+
+## Notes
+
+* `dummy` does not transmit packets.
+Therefore the container will not be able to reach any external network.
+This solution is designed to be used in conjunction with other CNI plugins (e.g., `bridge`) to provide an internal non-loopback address for applications to use.

plugins/main/dummy/dummy.go

@@ -0,0 +1,292 @@
+// Copyright 2022 Arista Networks
+//
+// 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 main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net"
+
+	"github.com/vishvananda/netlink"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types"
+	current "github.com/containernetworking/cni/pkg/types/100"
+	"github.com/containernetworking/cni/pkg/version"
+	"github.com/containernetworking/plugins/pkg/ip"
+	"github.com/containernetworking/plugins/pkg/ipam"
+	"github.com/containernetworking/plugins/pkg/ns"
+	bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
+)
+
+func parseNetConf(bytes []byte) (*types.NetConf, error) {
+	conf := &types.NetConf{}
+	if err := json.Unmarshal(bytes, conf); err != nil {
+		return nil, fmt.Errorf("failed to parse network config: %v", err)
+	}
+	return conf, nil
+}
+
+func createDummy(ifName string, netns ns.NetNS) (*current.Interface, error) {
+	dummy := &current.Interface{}
+
+	dm := &netlink.Dummy{
+		LinkAttrs: netlink.LinkAttrs{
+			Name:      ifName,
+			Namespace: netlink.NsFd(int(netns.Fd())),
+		},
+	}
+
+	if err := netlink.LinkAdd(dm); err != nil {
+		return nil, fmt.Errorf("failed to create dummy: %v", err)
+	}
+	dummy.Name = ifName
+
+	err := netns.Do(func(_ ns.NetNS) error {
+		// Re-fetch interface to get all properties/attributes
+		contDummy, err := netlink.LinkByName(ifName)
+		if err != nil {
+			return fmt.Errorf("failed to fetch dummy%q: %v", ifName, err)
+		}
+
+		dummy.Mac = contDummy.Attrs().HardwareAddr.String()
+		dummy.Sandbox = netns.Path()
+
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return dummy, nil
+}
+
+func cmdAdd(args *skel.CmdArgs) error {
+	conf, err := parseNetConf(args.StdinData)
+	if err != nil {
+		return err
+	}
+
+	if conf.IPAM.Type == "" {
+		return errors.New("dummy interface requires an IPAM configuration")
+	}
+
+	netns, err := ns.GetNS(args.Netns)
+	if err != nil {
+		return fmt.Errorf("failed to open netns %q: %v", netns, err)
+	}
+	defer netns.Close()
+
+	dummyInterface, err := createDummy(args.IfName, netns)
+	if err != nil {
+		return err
+	}
+
+	// Delete link if err to avoid link leak in this ns
+	defer func() {
+		if err != nil {
+			netns.Do(func(_ ns.NetNS) error {
+				return ip.DelLinkByName(args.IfName)
+			})
+		}
+	}()
+
+	r, err := ipam.ExecAdd(conf.IPAM.Type, args.StdinData)
+	if err != nil {
+		return err
+	}
+
+	// defer ipam deletion to avoid ip leak
+	defer func() {
+		if err != nil {
+			ipam.ExecDel(conf.IPAM.Type, args.StdinData)
+		}
+	}()
+
+	// convert IPAMResult to current Result type
+	result, err := current.NewResultFromResult(r)
+	if err != nil {
+		return err
+	}
+
+	if len(result.IPs) == 0 {
+		return errors.New("IPAM plugin returned missing IP config")
+	}
+
+	for _, ipc := range result.IPs {
+		// all addresses apply to the container dummy interface
+		ipc.Interface = current.Int(0)
+	}
+
+	result.Interfaces = []*current.Interface{dummyInterface}
+
+	err = netns.Do(func(_ ns.NetNS) error {
+		return ipam.ConfigureIface(args.IfName, result)
+	})
+
+	if err != nil {
+		return err
+	}
+
+	return types.PrintResult(result, conf.CNIVersion)
+}
+
+func cmdDel(args *skel.CmdArgs) error {
+	conf, err := parseNetConf(args.StdinData)
+	if err != nil {
+		return err
+	}
+
+	if err = ipam.ExecDel(conf.IPAM.Type, args.StdinData); err != nil {
+		return err
+	}
+
+	if args.Netns == "" {
+		return nil
+	}
+
+	err = ns.WithNetNSPath(args.Netns, func(ns.NetNS) error {
+		err = ip.DelLinkByName(args.IfName)
+		if err != nil && err == ip.ErrLinkNotFound {
+			return nil
+		}
+		return err
+	})
+
+	if err != nil {
+		//  if NetNs is passed down by the Cloud Orchestration Engine, or if it called multiple times
+		// so don't return an error if the device is already removed.
+		// https://github.com/kubernetes/kubernetes/issues/43014#issuecomment-287164444
+		_, ok := err.(ns.NSPathNotExistErr)
+		if ok {
+			return nil
+		}
+		return err
+	}
+
+	return nil
+}
+
+func main() {
+	skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("dummy"))
+}
+
+func cmdCheck(args *skel.CmdArgs) error {
+	conf, err := parseNetConf(args.StdinData)
+	if err != nil {
+		return err
+	}
+
+	if conf.IPAM.Type == "" {
+		return errors.New("dummy interface requires an IPAM configuration")
+	}
+
+	netns, err := ns.GetNS(args.Netns)
+	if err != nil {
+		return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
+	}
+	defer netns.Close()
+
+	// run the IPAM plugin and get back the config to apply
+	err = ipam.ExecCheck(conf.IPAM.Type, args.StdinData)
+	if err != nil {
+		return err
+	}
+
+	if conf.RawPrevResult == nil {
+		return fmt.Errorf("dummy: Required prevResult missing")
+	}
+
+	if err := version.ParsePrevResult(conf); err != nil {
+		return err
+	}
+
+	// Convert whatever the IPAM result was into the current Result type
+	result, err := current.NewResultFromResult(conf.PrevResult)
+	if err != nil {
+		return err
+	}
+
+	var contMap current.Interface
+	// Find interfaces for name whe know, that of dummy device inside container
+	for _, intf := range result.Interfaces {
+		if args.IfName == intf.Name {
+			if args.Netns == intf.Sandbox {
+				contMap = *intf
+				continue
+			}
+		}
+	}
+
+	// The namespace must be the same as what was configured
+	if args.Netns != contMap.Sandbox {
+		return fmt.Errorf("Sandbox in prevResult %s doesn't match configured netns: %s",
+			contMap.Sandbox, args.Netns)
+	}
+
+	//
+	// Check prevResults for ips, routes and dns against values found in the container
+	if err := netns.Do(func(_ ns.NetNS) error {
+		// Check interface against values found in the container
+		err := validateCniContainerInterface(contMap)
+		if err != nil {
+			return err
+		}
+
+		err = ip.ValidateExpectedInterfaceIPs(args.IfName, result.IPs)
+		if err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func validateCniContainerInterface(intf current.Interface) error {
+	var link netlink.Link
+	var err error
+
+	if intf.Name == "" {
+		return fmt.Errorf("Container interface name missing in prevResult: %v", intf.Name)
+	}
+	link, err = netlink.LinkByName(intf.Name)
+	if err != nil {
+		return fmt.Errorf("Container Interface name in prevResult: %s not found", intf.Name)
+	}
+	if intf.Sandbox == "" {
+		return fmt.Errorf("Error: Container interface %s should not be in host namespace", link.Attrs().Name)
+	}
+
+	_, isDummy := link.(*netlink.Dummy)
+	if !isDummy {
+		return fmt.Errorf("Error: Container interface %s not of type dummy", link.Attrs().Name)
+	}
+
+	if intf.Mac != "" {
+		if intf.Mac != link.Attrs().HardwareAddr.String() {
+			return fmt.Errorf("Interface %s Mac %s doesn't match container Mac: %s", intf.Name, intf.Mac, link.Attrs().HardwareAddr)
+		}
+	}
+
+	if link.Attrs().Flags&net.FlagUp != net.FlagUp {
+		return fmt.Errorf("Interface %s is down", intf.Name)
+	}
+
+	return nil
+}

plugins/main/dummy/dummy_suite_test.go

@@ -0,0 +1,40 @@
+// Copyright 2022 Arista Networks
+//
+// 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 main_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/onsi/gomega/gexec"
+)
+
+var pathToLoPlugin string
+
+func TestLoopback(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "plugins/main/dummy")
+}
+
+var _ = BeforeSuite(func() {
+	var err error
+	pathToLoPlugin, err = gexec.Build("github.com/containernetworking/plugins/plugins/main/dummy")
+	Expect(err).NotTo(HaveOccurred())
+})
+
+var _ = AfterSuite(func() {
+	gexec.CleanupBuildArtifacts()
+})

plugins/main/dummy/dummy_test.go

@@ -0,0 +1,385 @@
+// Copyright 2022 Arista Networks
+//
+// 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 main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net"
+	"os"
+	"strings"
+	"syscall"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types"
+	types020 "github.com/containernetworking/cni/pkg/types/020"
+	types040 "github.com/containernetworking/cni/pkg/types/040"
+	types100 "github.com/containernetworking/cni/pkg/types/100"
+	"github.com/containernetworking/plugins/pkg/ns"
+	"github.com/containernetworking/plugins/pkg/testutils"
+	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
+)
+
+const MASTER_NAME = "eth0"
+
+type Net struct {
+	Name          string                 `json:"name"`
+	CNIVersion    string                 `json:"cniVersion"`
+	Type          string                 `json:"type,omitempty"`
+	IPAM          *allocator.IPAMConfig  `json:"ipam"`
+	RawPrevResult map[string]interface{} `json:"prevResult,omitempty"`
+	PrevResult    types100.Result        `json:"-"`
+}
+
+func buildOneConfig(netName string, cniVersion string, orig *Net, prevResult types.Result) (*Net, error) {
+	var err error
+
+	inject := map[string]interface{}{
+		"name":       netName,
+		"cniVersion": cniVersion,
+	}
+	// Add previous plugin result
+	if prevResult != nil {
+		inject["prevResult"] = prevResult
+	}
+
+	// Ensure every config uses the same name and version
+	config := make(map[string]interface{})
+
+	confBytes, err := json.Marshal(orig)
+	if err != nil {
+		return nil, err
+	}
+
+	err = json.Unmarshal(confBytes, &config)
+	if err != nil {
+		return nil, fmt.Errorf("unmarshal existing network bytes: %s", err)
+	}
+
+	for key, value := range inject {
+		config[key] = value
+	}
+
+	newBytes, err := json.Marshal(config)
+	if err != nil {
+		return nil, err
+	}
+
+	conf := &Net{}
+	if err := json.Unmarshal(newBytes, &conf); err != nil {
+		return nil, fmt.Errorf("error parsing configuration: %s", err)
+	}
+
+	return conf, nil
+}
+
+type tester interface {
+	// verifyResult minimally verifies the Result and returns the interface's MAC address
+	verifyResult(result types.Result, name string) string
+}
+
+type testerBase struct{}
+
+type (
+	testerV10x      testerBase
+	testerV04x      testerBase
+	testerV03x      testerBase
+	testerV01xOr02x testerBase
+)
+
+func newTesterByVersion(version string) tester {
+	switch {
+	case strings.HasPrefix(version, "1.0."):
+		return &testerV10x{}
+	case strings.HasPrefix(version, "0.4."):
+		return &testerV04x{}
+	case strings.HasPrefix(version, "0.3."):
+		return &testerV03x{}
+	default:
+		return &testerV01xOr02x{}
+	}
+}
+
+// verifyResult minimally verifies the Result and returns the interface's MAC address
+func (t *testerV10x) verifyResult(result types.Result, name string) string {
+	r, err := types100.GetResult(result)
+	Expect(err).NotTo(HaveOccurred())
+
+	Expect(r.Interfaces).To(HaveLen(1))
+	Expect(r.Interfaces[0].Name).To(Equal(name))
+	Expect(r.IPs).To(HaveLen(1))
+
+	return r.Interfaces[0].Mac
+}
+
+func verify0403(result types.Result, name string) string {
+	r, err := types040.GetResult(result)
+	Expect(err).NotTo(HaveOccurred())
+
+	Expect(r.Interfaces).To(HaveLen(1))
+	Expect(r.Interfaces[0].Name).To(Equal(name))
+	Expect(r.IPs).To(HaveLen(1))
+
+	return r.Interfaces[0].Mac
+}
+
+// verifyResult minimally verifies the Result and returns the interface's MAC address
+func (t *testerV04x) verifyResult(result types.Result, name string) string {
+	return verify0403(result, name)
+}
+
+// verifyResult minimally verifies the Result and returns the interface's MAC address
+func (t *testerV03x) verifyResult(result types.Result, name string) string {
+	return verify0403(result, name)
+}
+
+// verifyResult minimally verifies the Result and returns the interface's MAC address
+func (t *testerV01xOr02x) verifyResult(result types.Result, _ string) string {
+	r, err := types020.GetResult(result)
+	Expect(err).NotTo(HaveOccurred())
+
+	Expect(r.IP4.IP.IP).NotTo(BeNil())
+	Expect(r.IP6).To(BeNil())
+
+	// 0.2 and earlier don't return MAC address
+	return ""
+}
+
+var _ = Describe("dummy Operations", func() {
+	var originalNS, targetNS ns.NetNS
+	var dataDir string
+
+	BeforeEach(func() {
+		// Create a new NetNS so we don't modify the host
+		var err error
+		originalNS, err = testutils.NewNS()
+		Expect(err).NotTo(HaveOccurred())
+		targetNS, err = testutils.NewNS()
+		Expect(err).NotTo(HaveOccurred())
+
+		dataDir, err = os.MkdirTemp("", "dummy_test")
+		Expect(err).NotTo(HaveOccurred())
+
+		err = originalNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+
+			// Add master
+			err = netlink.LinkAdd(&netlink.Dummy{
+				LinkAttrs: netlink.LinkAttrs{
+					Name: MASTER_NAME,
+				},
+			})
+			Expect(err).NotTo(HaveOccurred())
+			m, err := netlink.LinkByName(MASTER_NAME)
+			Expect(err).NotTo(HaveOccurred())
+			err = netlink.LinkSetUp(m)
+			Expect(err).NotTo(HaveOccurred())
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	AfterEach(func() {
+		Expect(os.RemoveAll(dataDir)).To(Succeed())
+		Expect(originalNS.Close()).To(Succeed())
+		Expect(testutils.UnmountNS(originalNS)).To(Succeed())
+		Expect(targetNS.Close()).To(Succeed())
+		Expect(testutils.UnmountNS(targetNS)).To(Succeed())
+	})
+
+	for _, ver := range testutils.AllSpecVersions {
+		// Redefine ver inside for scope so real value is picked up by each dynamically defined It()
+		// See Gingkgo's "Patterns for dynamically generating tests" documentation.
+		ver := ver
+
+		It(fmt.Sprintf("[%s] creates an dummy link in a non-default namespace", ver), func() {
+			// Create dummy in other namespace
+			err := originalNS.Do(func(ns.NetNS) error {
+				defer GinkgoRecover()
+
+				_, err := createDummy("foobar0", targetNS)
+				Expect(err).NotTo(HaveOccurred())
+				return nil
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			// Make sure dummy link exists in the target namespace
+			err = targetNS.Do(func(ns.NetNS) error {
+				defer GinkgoRecover()
+
+				link, err := netlink.LinkByName("foobar0")
+				Expect(err).NotTo(HaveOccurred())
+				Expect(link.Attrs().Name).To(Equal("foobar0"))
+				return nil
+			})
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It(fmt.Sprintf("[%s] configures and deconfigures a dummy link with ADD/CHECK/DEL", ver), func() {
+			const IFNAME = "dummy0"
+
+			conf := fmt.Sprintf(`{
+			    "cniVersion": "%s",
+			    "name": "dummyTestv4",
+			    "type": "dummy",
+			    "ipam": {
+					"type": "host-local",
+					"subnet": "10.1.2.0/24",
+					"dataDir": "%s"
+			    }
+			}`, ver, dataDir)
+
+			args := &skel.CmdArgs{
+				ContainerID: "contDummy",
+				Netns:       targetNS.Path(),
+				IfName:      IFNAME,
+				StdinData:   []byte(conf),
+			}
+
+			t := newTesterByVersion(ver)
+
+			var result types.Result
+			var macAddress string
+			err := originalNS.Do(func(ns.NetNS) error {
+				defer GinkgoRecover()
+
+				var err error
+				result, _, err = testutils.CmdAddWithArgs(args, func() error {
+					return cmdAdd(args)
+				})
+				Expect(err).NotTo(HaveOccurred())
+
+				macAddress = t.verifyResult(result, IFNAME)
+				return nil
+			})
+			Expect(err).NotTo(HaveOccurred())
+			// Make sure dummy link exists in the target namespace
+			err = targetNS.Do(func(ns.NetNS) error {
+				defer GinkgoRecover()
+
+				link, err := netlink.LinkByName(IFNAME)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(link.Attrs().Name).To(Equal(IFNAME))
+
+				if macAddress != "" {
+					hwaddr, err := net.ParseMAC(macAddress)
+					Expect(err).NotTo(HaveOccurred())
+					Expect(link.Attrs().HardwareAddr).To(Equal(hwaddr))
+				}
+
+				addrs, err := netlink.AddrList(link, syscall.AF_INET)
+				Expect(err).NotTo(HaveOccurred())
+				Expect(addrs).To(HaveLen(1))
+				return nil
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			// call CmdCheck
+			n := &Net{}
+			err = json.Unmarshal([]byte(conf), &n)
+			Expect(err).NotTo(HaveOccurred())
+
+			n.IPAM, _, err = allocator.LoadIPAMConfig([]byte(conf), "")
+			Expect(err).NotTo(HaveOccurred())
+
+			newConf, err := buildOneConfig("dummyTestv4", ver, n, result)
+			Expect(err).NotTo(HaveOccurred())
+
+			confString, err := json.Marshal(newConf)
+			Expect(err).NotTo(HaveOccurred())
+
+			args.StdinData = confString
+			// CNI Check dummy in the target namespace
+			err = originalNS.Do(func(ns.NetNS) error {
+				defer GinkgoRecover()
+				return testutils.CmdCheckWithArgs(args, func() error { return cmdCheck(args) })
+			})
+			if testutils.SpecVersionHasCHECK(ver) {
+				Expect(err).NotTo(HaveOccurred())
+			} else {
+				Expect(err).To(MatchError("config version does not allow CHECK"))
+			}
+
+			args.StdinData = []byte(conf)
+
+			err = originalNS.Do(func(ns.NetNS) error {
+				defer GinkgoRecover()
+
+				err = testutils.CmdDelWithArgs(args, func() error {
+					return cmdDel(args)
+				})
+				Expect(err).NotTo(HaveOccurred())
+				return nil
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			// Make sure dummy link has been deleted
+			err = targetNS.Do(func(ns.NetNS) error {
+				defer GinkgoRecover()
+
+				link, err := netlink.LinkByName(IFNAME)
+				Expect(err).To(HaveOccurred())
+				Expect(link).To(BeNil())
+				return nil
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			// DEL can be called multiple times, make sure no error is returned
+			// if the device is already removed.
+			err = originalNS.Do(func(ns.NetNS) error {
+				defer GinkgoRecover()
+
+				err = testutils.CmdDelWithArgs(args, func() error {
+					return cmdDel(args)
+				})
+				Expect(err).NotTo(HaveOccurred())
+				return nil
+			})
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It(fmt.Sprintf("[%s] fails to create dummy link with no ipam", ver), func() {
+			var err error
+
+			const confFmt = `{
+			    "cniVersion": "%s",
+			    "name": "mynet",
+			    "type": "dummy"
+			}`
+
+			args := &skel.CmdArgs{
+				ContainerID: "dummyCont",
+				Netns:       "/var/run/netns/test",
+				IfName:      "dummy0",
+				StdinData:   []byte(fmt.Sprintf(confFmt, ver)),
+			}
+
+			_ = originalNS.Do(func(netNS ns.NetNS) error {
+				defer GinkgoRecover()
+
+				_, _, err = testutils.CmdAddWithArgs(args, func() error {
+					return cmdAdd(args)
+				})
+				Expect(err).To(Equal(errors.New("dummy interface requires an IPAM configuration")))
+				return nil
+			})
+		})
+	}
+})

plugins/main/host-device/host-device.go

@@ -19,7 +19,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"path/filepath"
@@ -32,21 +31,18 @@ import (
 	"github.com/containernetworking/cni/pkg/types"
 	current "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/cni/pkg/version"
-
 	"github.com/containernetworking/plugins/pkg/ip"
 	"github.com/containernetworking/plugins/pkg/ipam"
 	"github.com/containernetworking/plugins/pkg/ns"
 	bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
 )
 
-var (
-	sysBusPCI = "/sys/bus/pci/devices"
-)
+var sysBusPCI = "/sys/bus/pci/devices"
 
 // Array of different linux drivers bound to network device needed for DPDK
 var userspaceDrivers = []string{"vfio-pci", "uio_pci_generic", "igb_uio"}
 
-//NetConf for host-device config, look the README to learn how to use those parameters
+// NetConf for host-device config, look the README to learn how to use those parameters
 type NetConf struct {
 	types.NetConf
 	Device        string `json:"device"` // Device-Name, something like eth0 or can0 etc.
@@ -162,10 +158,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 	if !cfg.DPDKMode {
 		err = containerNs.Do(func(_ ns.NetNS) error {
-			if err := ipam.ConfigureIface(args.IfName, newResult); err != nil {
-				return err
-			}
-			return nil
+			return ipam.ConfigureIface(args.IfName, newResult)
 		})
 		if err != nil {
 			return err
@@ -326,10 +319,11 @@ func getLink(devname, hwaddr, kernelpath, pciaddr string) (netlink.Link, error)
 	if err != nil {
 		return nil, fmt.Errorf("failed to list node links: %v", err)
 	}
+	switch {
 
-	if len(devname) > 0 {
+	case len(devname) > 0:
 		return netlink.LinkByName(devname)
-	} else if len(hwaddr) > 0 {
+	case len(hwaddr) > 0:
 		hwAddr, err := net.ParseMAC(hwaddr)
 		if err != nil {
 			return nil, fmt.Errorf("failed to parse MAC address %q: %v", hwaddr, err)
@@ -340,26 +334,26 @@ func getLink(devname, hwaddr, kernelpath, pciaddr string) (netlink.Link, error)
 				return link, nil
 			}
 		}
-	} else if len(kernelpath) > 0 {
+	case len(kernelpath) > 0:
 		if !filepath.IsAbs(kernelpath) || !strings.HasPrefix(kernelpath, "/sys/devices/") {
 			return nil, fmt.Errorf("kernel device path %q must be absolute and begin with /sys/devices/", kernelpath)
 		}
 		netDir := filepath.Join(kernelpath, "net")
-		files, err := ioutil.ReadDir(netDir)
+		entries, err := os.ReadDir(netDir)
 		if err != nil {
 			return nil, fmt.Errorf("failed to find network devices at %q", netDir)
 		}
 
 		// Grab the first device from eg /sys/devices/pci0000:00/0000:00:19.0/net
-		for _, file := range files {
+		for _, entry := range entries {
 			// Make sure it's really an interface
 			for _, l := range links {
-				if file.Name() == l.Attrs().Name {
+				if entry.Name() == l.Attrs().Name {
 					return l, nil
 				}
 			}
 		}
-	} else if len(pciaddr) > 0 {
+	case len(pciaddr) > 0:
 		netDir := filepath.Join(sysBusPCI, pciaddr, "net")
 		if _, err := os.Lstat(netDir); err != nil {
 			virtioNetDir := filepath.Join(sysBusPCI, pciaddr, "virtio*", "net")
@@ -369,12 +363,12 @@ func getLink(devname, hwaddr, kernelpath, pciaddr string) (netlink.Link, error)
 			}
 			netDir = matches[0]
 		}
-		fInfo, err := ioutil.ReadDir(netDir)
+		entries, err := os.ReadDir(netDir)
 		if err != nil {
 			return nil, fmt.Errorf("failed to read net directory %s: %q", netDir, err)
 		}
-		if len(fInfo) > 0 {
-			return netlink.LinkByName(fInfo[0].Name())
+		if len(entries) > 0 {
+			return netlink.LinkByName(entries[0].Name())
 		}
 		return nil, fmt.Errorf("failed to find device name for pci address %s", pciaddr)
 	}
@@ -387,7 +381,6 @@ func main() {
 }
 
 func cmdCheck(args *skel.CmdArgs) error {
-
 	cfg, err := loadConf(args.StdinData)
 	if err != nil {
 		return err
@@ -444,7 +437,6 @@ func cmdCheck(args *skel.CmdArgs) error {
 	//
 	// Check prevResults for ips, routes and dns against values found in the container
 	if err := netns.Do(func(_ ns.NetNS) error {
-
 		// Check interface against values found in the container
 		err := validateCniContainerInterface(contMap)
 		if err != nil {
@@ -470,7 +462,6 @@ func cmdCheck(args *skel.CmdArgs) error {
 }
 
 func validateCniContainerInterface(intf current.Interface) error {
-
 	var link netlink.Link
 	var err error
 

plugins/main/host-device/host-device_suite_test.go

@@ -15,10 +15,10 @@
 package main
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestVlan(t *testing.T) {

plugins/main/host-device/host-device_test.go

@@ -17,13 +17,16 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"math/rand"
 	"net"
 	"os"
 	"path"
 	"strings"
 
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
+
 	"github.com/containernetworking/cni/pkg/skel"
 	"github.com/containernetworking/cni/pkg/types"
 	types040 "github.com/containernetworking/cni/pkg/types/040"
@@ -31,10 +34,6 @@ import (
 	"github.com/containernetworking/cni/pkg/version"
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
-
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-	"github.com/vishvananda/netlink"
 )
 
 type Net struct {
@@ -87,14 +86,14 @@ func canonicalizeIP(ip *net.IP) error {
 // LoadIPAMConfig creates IPAMConfig using json encoded configuration provided
 // as `bytes`. At the moment values provided in envArgs are ignored so there
 // is no possibility to overload the json configuration using envArgs
-func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
+func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, error) {
 	n := Net{}
 	if err := json.Unmarshal(bytes, &n); err != nil {
-		return nil, "", err
+		return nil, err
 	}
 
 	if n.IPAM == nil {
-		return nil, "", fmt.Errorf("IPAM config missing 'ipam' key")
+		return nil, fmt.Errorf("IPAM config missing 'ipam' key")
 	}
 
 	// Validate all ranges
@@ -104,13 +103,13 @@ func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
 	for i := range n.IPAM.Addresses {
 		ip, addr, err := net.ParseCIDR(n.IPAM.Addresses[i].AddressStr)
 		if err != nil {
-			return nil, "", fmt.Errorf("invalid CIDR %s: %s", n.IPAM.Addresses[i].AddressStr, err)
+			return nil, fmt.Errorf("invalid CIDR %s: %s", n.IPAM.Addresses[i].AddressStr, err)
 		}
 		n.IPAM.Addresses[i].Address = *addr
 		n.IPAM.Addresses[i].Address.IP = ip
 
 		if err := canonicalizeIP(&n.IPAM.Addresses[i].Address.IP); err != nil {
-			return nil, "", fmt.Errorf("invalid address %d: %s", i, err)
+			return nil, fmt.Errorf("invalid address %d: %s", i, err)
 		}
 
 		if n.IPAM.Addresses[i].Address.IP.To4() != nil {
@@ -124,7 +123,7 @@ func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
 		e := IPAMEnvArgs{}
 		err := types.LoadArgs(envArgs, &e)
 		if err != nil {
-			return nil, "", err
+			return nil, err
 		}
 
 		if e.IP != "" {
@@ -133,7 +132,7 @@ func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
 
 				ip, subnet, err := net.ParseCIDR(ipstr)
 				if err != nil {
-					return nil, "", fmt.Errorf("invalid CIDR %s: %s", ipstr, err)
+					return nil, fmt.Errorf("invalid CIDR %s: %s", ipstr, err)
 				}
 
 				addr := Address{Address: net.IPNet{IP: ip, Mask: subnet.Mask}}
@@ -150,7 +149,7 @@ func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
 			for _, item := range strings.Split(string(e.GATEWAY), ",") {
 				gwip := net.ParseIP(strings.TrimSpace(item))
 				if gwip == nil {
-					return nil, "", fmt.Errorf("invalid gateway address: %s", item)
+					return nil, fmt.Errorf("invalid gateway address: %s", item)
 				}
 
 				for i := range n.IPAM.Addresses {
@@ -165,14 +164,14 @@ func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
 	// CNI spec 0.2.0 and below supported only one v4 and v6 address
 	if numV4 > 1 || numV6 > 1 {
 		if ok, _ := version.GreaterThanOrEqualTo(n.CNIVersion, "0.3.0"); !ok {
-			return nil, "", fmt.Errorf("CNI version %v does not support more than 1 address per family", n.CNIVersion)
+			return nil, fmt.Errorf("CNI version %v does not support more than 1 address per family", n.CNIVersion)
 		}
 	}
 
 	// Copy net name into IPAM so not to drag Net struct around
 	n.IPAM.Name = n.Name
 
-	return n.IPAM, n.CNIVersion, nil
+	return n.IPAM, nil
 }
 
 func buildOneConfig(name, cniVersion string, orig *Net, prevResult types.Result) (*Net, error) {
@@ -215,7 +214,6 @@ func buildOneConfig(name, cniVersion string, orig *Net, prevResult types.Result)
 	}
 
 	return conf, nil
-
 }
 
 type tester interface {
@@ -225,9 +223,11 @@ type tester interface {
 
 type testerBase struct{}
 
-type testerV10x testerBase
-type testerV04x testerBase
-type testerV03x testerBase
+type (
+	testerV10x testerBase
+	testerV04x testerBase
+	testerV03x testerBase
+)
 
 func newTesterByVersion(version string) tester {
 	switch {
@@ -260,8 +260,8 @@ func (t *testerV10x) expectDpdkInterfaceIP(result types.Result, ipAddress string
 	// check that the result was sane
 	res, err := types100.NewResultFromResult(result)
 	Expect(err).NotTo(HaveOccurred())
-	Expect(len(res.Interfaces)).To(Equal(0))
-	Expect(len(res.IPs)).To(Equal(1))
+	Expect(res.Interfaces).To(BeEmpty())
+	Expect(res.IPs).To(HaveLen(1))
 	Expect(res.IPs[0].Address.String()).To(Equal(ipAddress))
 }
 
@@ -282,8 +282,8 @@ func (t *testerV04x) expectDpdkInterfaceIP(result types.Result, ipAddress string
 	// check that the result was sane
 	res, err := types040.NewResultFromResult(result)
 	Expect(err).NotTo(HaveOccurred())
-	Expect(len(res.Interfaces)).To(Equal(0))
-	Expect(len(res.IPs)).To(Equal(1))
+	Expect(res.Interfaces).To(BeEmpty())
+	Expect(res.IPs).To(HaveLen(1))
 	Expect(res.IPs[0].Address.String()).To(Equal(ipAddress))
 }
 
@@ -304,8 +304,8 @@ func (t *testerV03x) expectDpdkInterfaceIP(result types.Result, ipAddress string
 	// check that the result was sane
 	res, err := types040.NewResultFromResult(result)
 	Expect(err).NotTo(HaveOccurred())
-	Expect(len(res.Interfaces)).To(Equal(0))
-	Expect(len(res.IPs)).To(Equal(1))
+	Expect(res.Interfaces).To(BeEmpty())
+	Expect(res.IPs).To(HaveLen(1))
 	Expect(res.IPs[0].Address.String()).To(Equal(ipAddress))
 }
 
@@ -665,11 +665,11 @@ var _ = Describe("base functionality", func() {
 				Expect(link.Attrs().HardwareAddr).To(Equal(origLink.Attrs().HardwareAddr))
 				Expect(link.Attrs().Flags & net.FlagUp).To(Equal(net.FlagUp))
 
-				//get the IP address of the interface in the target namespace
+				// get the IP address of the interface in the target namespace
 				addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 				Expect(err).NotTo(HaveOccurred())
 				addr := addrs[0].IPNet.String()
-				//assert that IP address is what we set
+				// assert that IP address is what we set
 				Expect(addr).To(Equal(targetIP))
 
 				return nil
@@ -712,7 +712,6 @@ var _ = Describe("base functionality", func() {
 			}
 			_, _, err := testutils.CmdAddWithArgs(args, func() error { return cmdAdd(args) })
 			Expect(err).To(MatchError(`specify either "device", "hwaddr", "kernelpath" or "pciBusID"`))
-
 		})
 
 		It(fmt.Sprintf("[%s] works with a valid config without IPAM", ver), func() {
@@ -869,7 +868,7 @@ var _ = Describe("base functionality", func() {
 			err = json.Unmarshal([]byte(conf), &n)
 			Expect(err).NotTo(HaveOccurred())
 
-			n.IPAM, _, err = LoadIPAMConfig([]byte(conf), "")
+			n.IPAM, err = LoadIPAMConfig([]byte(conf), "")
 			Expect(err).NotTo(HaveOccurred())
 
 			if testutils.SpecVersionHasCHECK(ver) {
@@ -962,11 +961,11 @@ var _ = Describe("base functionality", func() {
 				Expect(link.Attrs().HardwareAddr).To(Equal(origLink.Attrs().HardwareAddr))
 				Expect(link.Attrs().Flags & net.FlagUp).To(Equal(net.FlagUp))
 
-				//get the IP address of the interface in the target namespace
+				// get the IP address of the interface in the target namespace
 				addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 				Expect(err).NotTo(HaveOccurred())
 				addr := addrs[0].IPNet.String()
-				//assert that IP address is what we set
+				// assert that IP address is what we set
 				Expect(addr).To(Equal(targetIP))
 
 				return nil
@@ -985,7 +984,7 @@ var _ = Describe("base functionality", func() {
 			err = json.Unmarshal([]byte(conf), &n)
 			Expect(err).NotTo(HaveOccurred())
 
-			n.IPAM, _, err = LoadIPAMConfig([]byte(conf), "")
+			n.IPAM, err = LoadIPAMConfig([]byte(conf), "")
 			Expect(err).NotTo(HaveOccurred())
 
 			if testutils.SpecVersionHasCHECK(ver) {
@@ -1161,14 +1160,14 @@ type fakeFilesystem struct {
 
 func (fs *fakeFilesystem) use() func() {
 	// create the new fake fs root dir in /tmp/sriov...
-	tmpDir, err := ioutil.TempDir("", "sriov")
+	tmpDir, err := os.MkdirTemp("", "sriov")
 	if err != nil {
 		panic(fmt.Errorf("error creating fake root dir: %s", err.Error()))
 	}
 	fs.rootDir = tmpDir
 
 	for _, dir := range fs.dirs {
-		err := os.MkdirAll(path.Join(fs.rootDir, dir), 0755)
+		err := os.MkdirAll(path.Join(fs.rootDir, dir), 0o755)
 		if err != nil {
 			panic(fmt.Errorf("error creating fake directory: %s", err.Error()))
 		}

plugins/main/ipvlan/ipvlan.go

@@ -26,7 +26,6 @@ import (
 	"github.com/containernetworking/cni/pkg/types"
 	current "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/cni/pkg/version"
-
 	"github.com/containernetworking/plugins/pkg/ip"
 	"github.com/containernetworking/plugins/pkg/ipam"
 	"github.com/containernetworking/plugins/pkg/ns"
@@ -36,9 +35,10 @@ import (
 
 type NetConf struct {
 	types.NetConf
-	Master string `json:"master"`
-	Mode   string `json:"mode"`
-	MTU    int    `json:"mtu"`
+	Master     string `json:"master"`
+	Mode       string `json:"mode"`
+	MTU        int    `json:"mtu"`
+	LinkContNs bool   `json:"linkInContainer,omitempty"`
 }
 
 func init() {
@@ -48,9 +48,9 @@ func init() {
 	runtime.LockOSThread()
 }
 
-func loadConf(bytes []byte, cmdCheck bool) (*NetConf, string, error) {
+func loadConf(args *skel.CmdArgs, cmdCheck bool) (*NetConf, string, error) {
 	n := &NetConf{}
-	if err := json.Unmarshal(bytes, n); err != nil {
+	if err := json.Unmarshal(args.StdinData, n); err != nil {
 		return nil, "", fmt.Errorf("failed to load netconf: %v", err)
 	}
 
@@ -73,8 +73,8 @@ func loadConf(bytes []byte, cmdCheck bool) (*NetConf, string, error) {
 	}
 	if n.Master == "" {
 		if result == nil {
-			defaultRouteInterface, err := getDefaultRouteInterfaceName()
-
+			var defaultRouteInterface string
+			defaultRouteInterface, err = getNamespacedDefaultRouteInterfaceName(args.Netns, n.LinkContNs)
 			if err != nil {
 				return nil, "", err
 			}
@@ -124,7 +124,15 @@ func createIpvlan(conf *NetConf, ifName string, netns ns.NetNS) (*current.Interf
 		return nil, err
 	}
 
-	m, err := netlink.LinkByName(conf.Master)
+	var m netlink.Link
+	if conf.LinkContNs {
+		err = netns.Do(func(_ ns.NetNS) error {
+			m, err = netlink.LinkByName(conf.Master)
+			return err
+		})
+	} else {
+		m, err = netlink.LinkByName(conf.Master)
+	}
 	if err != nil {
 		return nil, fmt.Errorf("failed to lookup master %q: %v", conf.Master, err)
 	}
@@ -146,8 +154,14 @@ func createIpvlan(conf *NetConf, ifName string, netns ns.NetNS) (*current.Interf
 		Mode: mode,
 	}
 
-	if err := netlink.LinkAdd(mv); err != nil {
-		return nil, fmt.Errorf("failed to create ipvlan: %v", err)
+	if conf.LinkContNs {
+		err = netns.Do(func(_ ns.NetNS) error {
+			return netlink.LinkAdd(mv)
+		})
+	} else {
+		if err := netlink.LinkAdd(mv); err != nil {
+			return nil, fmt.Errorf("failed to create ipvlan: %v", err)
+		}
 	}
 
 	err = netns.Do(func(_ ns.NetNS) error {
@@ -193,8 +207,31 @@ func getDefaultRouteInterfaceName() (string, error) {
 	return "", fmt.Errorf("no default route interface found")
 }
 
+func getNamespacedDefaultRouteInterfaceName(namespace string, inContainer bool) (string, error) {
+	if !inContainer {
+		return getDefaultRouteInterfaceName()
+	}
+	netns, err := ns.GetNS(namespace)
+	if err != nil {
+		return "", fmt.Errorf("failed to open netns %q: %v", netns, err)
+	}
+	defer netns.Close()
+	var defaultRouteInterface string
+	err = netns.Do(func(_ ns.NetNS) error {
+		defaultRouteInterface, err = getDefaultRouteInterfaceName()
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+	if err != nil {
+		return "", err
+	}
+	return defaultRouteInterface, nil
+}
+
 func cmdAdd(args *skel.CmdArgs) error {
-	n, cniVersion, err := loadConf(args.StdinData, false)
+	n, cniVersion, err := loadConf(args, false)
 	if err != nil {
 		return err
 	}
@@ -256,11 +293,9 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 	err = netns.Do(func(_ ns.NetNS) error {
 		_, _ = sysctl.Sysctl(fmt.Sprintf("net/ipv4/conf/%s/arp_notify", args.IfName), "1")
+		_, _ = sysctl.Sysctl(fmt.Sprintf("net/ipv6/conf/%s/ndisc_notify", args.IfName), "1")
 
-		if err := ipam.ConfigureIface(args.IfName, result); err != nil {
-			return err
-		}
-		return nil
+		return ipam.ConfigureIface(args.IfName, result)
 	})
 	if err != nil {
 		return err
@@ -272,7 +307,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 }
 
 func cmdDel(args *skel.CmdArgs) error {
-	n, _, err := loadConf(args.StdinData, false)
+	n, _, err := loadConf(args, false)
 	if err != nil {
 		return err
 	}
@@ -319,8 +354,7 @@ func main() {
 }
 
 func cmdCheck(args *skel.CmdArgs) error {
-
-	n, _, err := loadConf(args.StdinData, true)
+	n, _, err := loadConf(args, true)
 	if err != nil {
 		return err
 	}
@@ -369,16 +403,23 @@ func cmdCheck(args *skel.CmdArgs) error {
 			contMap.Sandbox, args.Netns)
 	}
 
-	m, err := netlink.LinkByName(n.Master)
+	if n.LinkContNs {
+		err = netns.Do(func(_ ns.NetNS) error {
+			_, err = netlink.LinkByName(n.Master)
+			return err
+		})
+	} else {
+		_, err = netlink.LinkByName(n.Master)
+	}
+
 	if err != nil {
 		return fmt.Errorf("failed to lookup master %q: %v", n.Master, err)
 	}
 
 	// Check prevResults for ips, routes and dns against values found in the container
 	if err := netns.Do(func(_ ns.NetNS) error {
-
 		// Check interface against values found in the container
-		err := validateCniContainerInterface(contMap, m.Attrs().Index, n.Mode)
+		err := validateCniContainerInterface(contMap, n.Mode)
 		if err != nil {
 			return err
 		}
@@ -400,8 +441,7 @@ func cmdCheck(args *skel.CmdArgs) error {
 	return nil
 }
 
-func validateCniContainerInterface(intf current.Interface, masterIndex int, modeExpected string) error {
-
+func validateCniContainerInterface(intf current.Interface, modeExpected string) error {
 	var link netlink.Link
 	var err error
 
@@ -422,6 +462,9 @@ func validateCniContainerInterface(intf current.Interface, masterIndex int, mode
 	}
 
 	mode, err := modeFromString(modeExpected)
+	if err != nil {
+		return err
+	}
 	if ipv.Mode != mode {
 		currString, err := modeToString(ipv.Mode)
 		if err != nil {

plugins/main/ipvlan/ipvlan_suite_test.go

@@ -15,10 +15,10 @@
 package main
 
 import (
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
-
 	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 )
 
 func TestIpvlan(t *testing.T) {

plugins/main/ipvlan/ipvlan_test.go

@@ -17,28 +17,29 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"strings"
 	"syscall"
 
-	"github.com/containernetworking/cni/pkg/skel"
-	"github.com/containernetworking/cni/pkg/types"
-	"github.com/containernetworking/cni/pkg/types/020"
-	"github.com/containernetworking/cni/pkg/types/040"
-	"github.com/containernetworking/cni/pkg/types/100"
-	"github.com/containernetworking/plugins/pkg/ns"
-	"github.com/containernetworking/plugins/pkg/testutils"
-
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
 	"github.com/vishvananda/netlink"
 
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types"
+	types020 "github.com/containernetworking/cni/pkg/types/020"
+	types040 "github.com/containernetworking/cni/pkg/types/040"
+	types100 "github.com/containernetworking/cni/pkg/types/100"
+	"github.com/containernetworking/plugins/pkg/ns"
+	"github.com/containernetworking/plugins/pkg/testutils"
 	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
-	. "github.com/onsi/ginkgo"
-	. "github.com/onsi/gomega"
 )
 
-const MASTER_NAME = "eth0"
+const (
+	MASTER_NAME             = "eth0"
+	MASTER_NAME_INCONTAINER = "eth1"
+)
 
 type Net struct {
 	Name          string                 `json:"name"`
@@ -50,6 +51,7 @@ type Net struct {
 	DNS           types.DNS              `json:"dns"`
 	RawPrevResult map[string]interface{} `json:"prevResult,omitempty"`
 	PrevResult    types100.Result        `json:"-"`
+	LinkContNs    bool                   `json:"linkInContainer"`
 }
 
 func buildOneConfig(cniVersion string, master string, orig *Net, prevResult types.Result) (*Net, error) {
@@ -91,7 +93,6 @@ func buildOneConfig(cniVersion string, master string, orig *Net, prevResult type
 	}
 
 	return conf, nil
-
 }
 
 func ipvlanAddCheckDelTest(conf, masterName string, originalNS, targetNS ns.NetNS) {
@@ -140,7 +141,7 @@ func ipvlanAddCheckDelTest(conf, masterName string, originalNS, targetNS ns.NetN
 
 		addrs, err := netlink.AddrList(link, syscall.AF_INET)
 		Expect(err).NotTo(HaveOccurred())
-		Expect(len(addrs)).To(Equal(1))
+		Expect(addrs).To(HaveLen(1))
 		return nil
 	})
 	Expect(err).NotTo(HaveOccurred())
@@ -205,9 +206,11 @@ type tester interface {
 
 type testerBase struct{}
 
-type testerV10x testerBase
-type testerV04x testerBase
-type testerV02x testerBase
+type (
+	testerV10x testerBase
+	testerV04x testerBase
+	testerV02x testerBase
+)
 
 func newTesterByVersion(version string) tester {
 	switch {
@@ -227,9 +230,9 @@ func (t *testerV10x) verifyResult(result types.Result, name string) string {
 	r, err := types100.GetResult(result)
 	Expect(err).NotTo(HaveOccurred())
 
-	Expect(len(r.Interfaces)).To(Equal(1))
+	Expect(r.Interfaces).To(HaveLen(1))
 	Expect(r.Interfaces[0].Name).To(Equal(name))
-	Expect(len(r.IPs)).To(Equal(1))
+	Expect(r.IPs).To(HaveLen(1))
 
 	return r.Interfaces[0].Mac
 }
@@ -239,15 +242,15 @@ func (t *testerV04x) verifyResult(result types.Result, name string) string {
 	r, err := types040.GetResult(result)
 	Expect(err).NotTo(HaveOccurred())
 
-	Expect(len(r.Interfaces)).To(Equal(1))
+	Expect(r.Interfaces).To(HaveLen(1))
 	Expect(r.Interfaces[0].Name).To(Equal(name))
-	Expect(len(r.IPs)).To(Equal(1))
+	Expect(r.IPs).To(HaveLen(1))
 
 	return r.Interfaces[0].Mac
 }
 
 // verifyResult minimally verifies the Result and returns the interface's MAC address
-func (t *testerV02x) verifyResult(result types.Result, name string) string {
+func (t *testerV02x) verifyResult(result types.Result, _ string) string {
 	r, err := types020.GetResult(result)
 	Expect(err).NotTo(HaveOccurred())
 
@@ -272,7 +275,7 @@ var _ = Describe("ipvlan Operations", func() {
 		targetNS, err = testutils.NewNS()
 		Expect(err).NotTo(HaveOccurred())
 
-		dataDir, err = ioutil.TempDir("", "ipvlan_test")
+		dataDir, err = os.MkdirTemp("", "ipvlan_test")
 		Expect(err).NotTo(HaveOccurred())
 
 		err = originalNS.Do(func(ns.NetNS) error {
@@ -290,6 +293,22 @@ var _ = Describe("ipvlan Operations", func() {
 			return nil
 		})
 		Expect(err).NotTo(HaveOccurred())
+
+		err = targetNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+
+			// Add master
+			err = netlink.LinkAdd(&netlink.Dummy{
+				LinkAttrs: netlink.LinkAttrs{
+					Name: MASTER_NAME_INCONTAINER,
+				},
+			})
+			Expect(err).NotTo(HaveOccurred())
+			_, err = netlink.LinkByName(MASTER_NAME_INCONTAINER)
+			Expect(err).NotTo(HaveOccurred())
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
 	})
 
 	AfterEach(func() {
@@ -302,67 +321,77 @@ var _ = Describe("ipvlan Operations", func() {
 		Expect(testutils.UnmountNS(targetNS)).To(Succeed())
 	})
 
-	for _, ver := range testutils.AllSpecVersions {
-		// Redefine ver inside for scope so real value is picked up by each dynamically defined It()
-		// See Gingkgo's "Patterns for dynamically generating tests" documentation.
-		ver := ver
+	for _, inContainer := range []bool{false, true} {
+		masterInterface := MASTER_NAME
+		if inContainer {
+			masterInterface = MASTER_NAME_INCONTAINER
+		}
+		// for _, ver := range testutils.AllSpecVersions {
+		for _, ver := range [...]string{"1.0.0"} {
+			// Redefine ver inside for scope so real value is picked up by each dynamically defined It()
+			// See Gingkgo's "Patterns for dynamically generating tests" documentation.
+			ver := ver
+			isInContainer := inContainer // Tests need a local var with constant value
 
-		It(fmt.Sprintf("[%s] creates an ipvlan link in a non-default namespace", ver), func() {
-			conf := &NetConf{
-				NetConf: types.NetConf{
-					CNIVersion: ver,
-					Name:       "testConfig",
-					Type:       "ipvlan",
-				},
-				Master: MASTER_NAME,
-				Mode:   "l2",
-				MTU:    1500,
-			}
+			It(fmt.Sprintf("[%s] creates an ipvlan link in a non-default namespace", ver), func() {
+				conf := &NetConf{
+					NetConf: types.NetConf{
+						CNIVersion: ver,
+						Name:       "testConfig",
+						Type:       "ipvlan",
+					},
+					Master:     masterInterface,
+					Mode:       "l2",
+					MTU:        1500,
+					LinkContNs: isInContainer,
+				}
 
-			err := originalNS.Do(func(ns.NetNS) error {
-				defer GinkgoRecover()
+				err := originalNS.Do(func(ns.NetNS) error {
+					defer GinkgoRecover()
+
+					_, err := createIpvlan(conf, "foobar0", targetNS)
+					Expect(err).NotTo(HaveOccurred())
+					return nil
+				})
 
-				_, err := createIpvlan(conf, "foobar0", targetNS)
 				Expect(err).NotTo(HaveOccurred())
-				return nil
+
+				// Make sure ipvlan link exists in the target namespace
+				err = targetNS.Do(func(ns.NetNS) error {
+					defer GinkgoRecover()
+
+					link, err := netlink.LinkByName("foobar0")
+					Expect(err).NotTo(HaveOccurred())
+					Expect(link.Attrs().Name).To(Equal("foobar0"))
+					return nil
+				})
+				Expect(err).NotTo(HaveOccurred())
 			})
 
-			Expect(err).NotTo(HaveOccurred())
-
-			// Make sure ipvlan link exists in the target namespace
-			err = targetNS.Do(func(ns.NetNS) error {
-				defer GinkgoRecover()
-
-				link, err := netlink.LinkByName("foobar0")
-				Expect(err).NotTo(HaveOccurred())
-				Expect(link.Attrs().Name).To(Equal("foobar0"))
-				return nil
-			})
-			Expect(err).NotTo(HaveOccurred())
-		})
-
-		It(fmt.Sprintf("[%s] configures and deconfigures an iplvan link with ADD/DEL", ver), func() {
-			conf := fmt.Sprintf(`{
+			It(fmt.Sprintf("[%s] configures and deconfigures an iplvan link with ADD/DEL", ver), func() {
+				conf := fmt.Sprintf(`{
 			    "cniVersion": "%s",
 			    "name": "mynet",
 			    "type": "ipvlan",
 			    "master": "%s",
+				"linkInContainer": %t,
 			    "ipam": {
 				"type": "host-local",
 				"subnet": "10.1.2.0/24",
 				"dataDir": "%s"
 			    }
-			}`, ver, MASTER_NAME, dataDir)
+			}`, ver, masterInterface, isInContainer, dataDir)
 
-			ipvlanAddCheckDelTest(conf, "", originalNS, targetNS)
-		})
+				ipvlanAddCheckDelTest(conf, "", originalNS, targetNS)
+			})
 
-		if testutils.SpecVersionHasChaining(ver) {
-			It(fmt.Sprintf("[%s] configures and deconfigures an iplvan link with ADD/DEL when chained", ver), func() {
-				conf := fmt.Sprintf(`{
+			if testutils.SpecVersionHasChaining(ver) {
+				It(fmt.Sprintf("[%s] configures and deconfigures an iplvan link with ADD/DEL when chained", ver), func() {
+					conf := fmt.Sprintf(`{
 				    "cniVersion": "%s",
 				    "name": "mynet",
 				    "type": "ipvlan",
+					"linkInContainer": %t,
 				    "prevResult": {
 					    "interfaces": [
 						    {
@@ -379,84 +408,91 @@ var _ = Describe("ipvlan Operations", func() {
 					    ],
 					    "routes": []
 				    }
-				}`, ver, MASTER_NAME)
+				}`, ver, isInContainer, masterInterface)
 
-				ipvlanAddCheckDelTest(conf, MASTER_NAME, originalNS, targetNS)
-			})
-		}
+					ipvlanAddCheckDelTest(conf, masterInterface, originalNS, targetNS)
+				})
+			}
 
-		It(fmt.Sprintf("[%s] deconfigures an unconfigured ipvlan link with DEL", ver), func() {
-			conf := fmt.Sprintf(`{
+			It(fmt.Sprintf("[%s] deconfigures an unconfigured ipvlan link with DEL", ver), func() {
+				conf := fmt.Sprintf(`{
 			    "cniVersion": "%s",
 			    "name": "mynet",
 			    "type": "ipvlan",
 			    "master": "%s",
+				"linkInContainer": %t,
 			    "ipam": {
 				"type": "host-local",
 				"subnet": "10.1.2.0/24",
 				"dataDir": "%s"
 			    }
-			}`, ver, MASTER_NAME, dataDir)
+			}`, ver, masterInterface, isInContainer, dataDir)
 
-			args := &skel.CmdArgs{
-				ContainerID: "dummy",
-				Netns:       targetNS.Path(),
-				IfName:      "ipvl0",
-				StdinData:   []byte(conf),
-			}
+				args := &skel.CmdArgs{
+					ContainerID: "dummy",
+					Netns:       targetNS.Path(),
+					IfName:      "ipvl0",
+					StdinData:   []byte(conf),
+				}
 
-			err := originalNS.Do(func(ns.NetNS) error {
-				defer GinkgoRecover()
+				err := originalNS.Do(func(ns.NetNS) error {
+					defer GinkgoRecover()
 
-				err := testutils.CmdDelWithArgs(args, func() error {
-					return cmdDel(args)
+					err := testutils.CmdDelWithArgs(args, func() error {
+						return cmdDel(args)
+					})
+					Expect(err).NotTo(HaveOccurred())
+					return nil
 				})
 				Expect(err).NotTo(HaveOccurred())
-				return nil
 			})
-			Expect(err).NotTo(HaveOccurred())
-		})
 
-		It(fmt.Sprintf("[%s] configures and deconfigures a ipvlan link with ADD/DEL, without master config", ver), func() {
-			conf := fmt.Sprintf(`{
+			It(fmt.Sprintf("[%s] configures and deconfigures a ipvlan link with ADD/DEL, without master config", ver), func() {
+				conf := fmt.Sprintf(`{
 			    "cniVersion": "%s",
 			    "name": "mynet",
 			    "type": "ipvlan",
+				"linkInContainer": %t,
 			    "ipam": {
 				"type": "host-local",
 				"subnet": "10.1.2.0/24",
 				"dataDir": "%s"
 			    }
-			}`, ver, dataDir)
+			}`, ver, isInContainer, dataDir)
 
-			// Make MASTER_NAME as default route interface
-			err := originalNS.Do(func(ns.NetNS) error {
-				defer GinkgoRecover()
-
-				link, err := netlink.LinkByName(MASTER_NAME)
-				Expect(err).NotTo(HaveOccurred())
-				err = netlink.LinkSetUp(link)
-				Expect(err).NotTo(HaveOccurred())
-
-				var address = &net.IPNet{IP: net.IPv4(192, 0, 0, 1), Mask: net.CIDRMask(24, 32)}
-				var addr = &netlink.Addr{IPNet: address}
-				err = netlink.AddrAdd(link, addr)
-				Expect(err).NotTo(HaveOccurred())
-
-				// add default gateway into MASTER
-				dst := &net.IPNet{
-					IP:   net.IPv4(0, 0, 0, 0),
-					Mask: net.CIDRMask(0, 0),
+				// Make MASTER_NAME as default route interface
+				currentNs := originalNS
+				if isInContainer {
+					currentNs = targetNS
 				}
-				ip := net.IPv4(192, 0, 0, 254)
-				route := netlink.Route{LinkIndex: link.Attrs().Index, Dst: dst, Gw: ip}
-				err = netlink.RouteAdd(&route)
-				Expect(err).NotTo(HaveOccurred())
-				return nil
-			})
-			Expect(err).NotTo(HaveOccurred())
+				err := currentNs.Do(func(ns.NetNS) error {
+					defer GinkgoRecover()
 
-			ipvlanAddCheckDelTest(conf, MASTER_NAME, originalNS, targetNS)
-		})
+					link, err := netlink.LinkByName(masterInterface)
+					Expect(err).NotTo(HaveOccurred())
+					err = netlink.LinkSetUp(link)
+					Expect(err).NotTo(HaveOccurred())
+
+					address := &net.IPNet{IP: net.IPv4(192, 0, 0, 1), Mask: net.CIDRMask(24, 32)}
+					addr := &netlink.Addr{IPNet: address}
+					err = netlink.AddrAdd(link, addr)
+					Expect(err).NotTo(HaveOccurred())
+
+					// add default gateway into MASTER
+					dst := &net.IPNet{
+						IP:   net.IPv4(0, 0, 0, 0),
+						Mask: net.CIDRMask(0, 0),
+					}
+					ip := net.IPv4(192, 0, 0, 254)
+					route := netlink.Route{LinkIndex: link.Attrs().Index, Dst: dst, Gw: ip}
+					err = netlink.RouteAdd(&route)
+					Expect(err).NotTo(HaveOccurred())
+					return nil
+				})
+				Expect(err).NotTo(HaveOccurred())
+
+				ipvlanAddCheckDelTest(conf, masterInterface, originalNS, targetNS)
+			})
+		}
 	}
 })

plugins/main/loopback/loopback.go

@@ -26,7 +26,6 @@ import (
 	"github.com/containernetworking/cni/pkg/types"
 	current "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/cni/pkg/version"
-
 	"github.com/containernetworking/plugins/pkg/ns"
 	bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
 )
@@ -112,7 +111,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 		r := &current.Result{
 			CNIVersion: conf.CNIVersion,
 			Interfaces: []*current.Interface{
-				&current.Interface{
+				{
 					Name:    args.IfName,
 					Mac:     "00:00:00:00:00:00",
 					Sandbox: args.Netns,