Merge pull request #716 from squeed/cp-bugfixes

[release-1.1] Cherry-pick some bugfixes

.github/actions/retest-action/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.21
+FROM alpine:3.10
 
 RUN apk add --no-cache curl jq
 

.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
 
-RUN_URL=$(jq -r '.rerun_url' run.json)
+RERUN_URL=$(jq -r '.rerun_url' run.json)
 
 curl --request POST \
-    --url "${RUN_URL}/rerun-failed-jobs" \
+    --url "${RERUN_URL}" \
     --header "authorization: Bearer ${GITHUB_TOKEN}" \
     --header "content-type: application/json"
 

.github/dependabot.yml

@@ -1,25 +0,0 @@
-# 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:
-          - "*"
-        exclude-patterns:
-          - "github.com/containernetworking/*"

.github/go-version

@@ -1 +0,0 @@
-1.23

.github/workflows/commands.yml

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

.github/workflows/release.yaml

@@ -1,114 +0,0 @@
----
-name: Release binaries
-on:
-  push:
-    tags:
-      - 'v*'
-
-jobs:
-  linux_release:
-    name: Release linux binaries
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        goarch: [amd64, arm, arm64, mips64le, ppc64le, riscv64, s390x]
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Install Go
-        uses: actions/setup-go@v5
-        with:
-          go-version-file: .github/go-version
-
-      - name: Build
-        env:
-          GOARCH: ${{ matrix.goarch }}
-          CGO_ENABLED: 0
-        run: ./build_linux.sh -ldflags '-extldflags -static -X github.com/containernetworking/plugins/pkg/utils/buildversion.BuildVersion=${{ github.ref_name }}'
-
-      - name: COPY files
-        run: cp README.md LICENSE bin/
-
-      - name: Change plugin file ownership
-        working-directory: ./bin
-        run: sudo chown -R root:root .
-
-      - name: Create dist directory
-        run: mkdir dist
-
-      - name: Create archive file
-        working-directory: ./bin
-        run: tar cfzpv ../dist/cni-plugins-linux-${{ matrix.goarch }}-${{ github.ref_name }}.tgz .
-
-      - name: Create sha256 checksum
-        working-directory: ./dist
-        run: sha256sum cni-plugins-linux-${{ matrix.goarch }}-${{ github.ref_name }}.tgz | tee cni-plugins-linux-${{ matrix.goarch }}-${{ github.ref_name }}.tgz.sha256
-
-      - name: Create sha512 checksum
-        working-directory: ./dist
-        run: sha512sum cni-plugins-linux-${{ matrix.goarch }}-${{ github.ref_name }}.tgz | tee cni-plugins-linux-${{ matrix.goarch }}-${{ github.ref_name }}.tgz.sha512
-
-      - name: Upload binaries to release
-        uses: svenstaro/upload-release-action@v2
-        with:
-          repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: ./dist/*
-          tag: ${{ github.ref }}
-          overwrite: true
-          file_glob: true
-
-  windows_releases:
-    name: Release windows binaries
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        goarch: [amd64]
-    steps:
-      - name: Install dos2unix
-        run: sudo apt-get install dos2unix
-
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Install Go
-        uses: actions/setup-go@v5
-        with:
-          go-version-file: .github/go-version
-
-      - name: Build
-        env:
-          GOARCH: ${{ matrix.goarch }}
-          CGO_ENABLED: 0
-        run: ./build_windows.sh -ldflags '-extldflags -static -X github.com/containernetworking/plugins/pkg/utils/buildversion.BuildVersion=${{ github.ref_name }}'
-
-      - name: COPY files
-        run: cp README.md LICENSE bin/
-
-      - name: Change plugin file ownership
-        working-directory: ./bin
-        run: sudo chown -R root:root .
-
-      - name: Create dist directory
-        run: mkdir dist
-
-      - name: Create archive file
-        working-directory: ./bin
-        run: tar cpfzv ../dist/cni-plugins-windows-${{ matrix.goarch }}-${{ github.ref_name }}.tgz .
-
-      - name: Create sha256 checksum
-        working-directory: ./dist
-        run: sha256sum cni-plugins-windows-${{ matrix.goarch }}-${{ github.ref_name }}.tgz | tee cni-plugins-windows-${{ matrix.goarch }}-${{ github.ref_name }}.tgz.sha256
-
-      - name: Create sha512 checksum
-        working-directory: ./dist
-        run: sha512sum cni-plugins-windows-${{ matrix.goarch }}-${{ github.ref_name }}.tgz | tee cni-plugins-windows-${{ matrix.goarch }}-${{ github.ref_name }}.tgz.sha512
-
-      - name: Upload binaries to release
-        uses: svenstaro/upload-release-action@v2
-        with:
-          repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: ./dist/*
-          tag: ${{ github.ref }}
-          overwrite: true
-          file_glob: true

.github/workflows/test.yaml

@@ -1,53 +1,23 @@
 ---
 name: test
 
-on:
-  pull_request: {}
+on: ["push", "pull_request"]
 
 env:
-  LINUX_ARCHES: "amd64 386 arm arm64 s390x mips64le ppc64le riscv64"
+  GO_VERSION: "1.17"
+  LINUX_ARCHES: "amd64 386 arm arm64 s390x mips64le ppc64le"
 
 jobs:
-  lint:
-    name: Lint
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: setup go
-        uses: actions/setup-go@v5
-        with:
-          go-version-file: .github/go-version
-      - uses: ibiqlik/action-yamllint@v3
-        with:
-          format: auto
-      - uses: golangci/golangci-lint-action@v6
-        with:
-          version: v1.61.0
-          args: -v
-  verify-vendor:
-    name: Verify vendor directory
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install Go
-        uses: actions/setup-go@v5
-        with:
-          go-version-file: .github/go-version
-      - name: Check module vendoring
-        run: |
-          go mod tidy
-          go mod vendor
-          test -z "$(git status --porcelain)" || (echo "please run 'go mod tidy && go mod vendor', and submit your changes"; exit 1)
   build:
     name: Build all linux architectures
-    needs: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
       - name: setup go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v2
         with:
-          go-version-file: .github/go-version
+          go-version: ${{ env.GO_VERSION }}
+      - uses: actions/checkout@v2
+
       - name: Build on all supported architectures
         run: |
           set -e
@@ -56,9 +26,9 @@ jobs:
             GOARCH=$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
@@ -67,25 +37,24 @@ jobs:
           sudo apt-get install linux-modules-extra-$(uname -r)
       - name: Install nftables
         run: sudo apt-get install nftables
-      - name: Install dnsmasq(dhcp server)
-        run: |
-          sudo apt-get install dnsmasq
-          sudo systemctl disable --now dnsmasq
-      - uses: actions/checkout@v4
+
       - name: setup go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v2
         with:
-          go-version-file: .github/go-version
+          go-version: ${{ env.GO_VERSION }}
       - 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 install github.com/containernetworking/cni/cnitool@latest
-          go install github.com/mattn/goveralls@latest
-          go install github.com/modocache/gover@latest
+          go get github.com/containernetworking/cni/cnitool
+          go get github.com/mattn/goveralls
+          go get github.com/modocache/gover
 
       - name: test
         run: PATH=$PATH:$(go env GOPATH)/bin COVERALLS=1 ./test_linux.sh
@@ -97,15 +66,15 @@ 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@v5
+        uses: actions/setup-go@v2
         with:
-          go-version-file: .github/go-version
+          go-version: ${{ env.GO_VERSION }}
+      - uses: actions/checkout@v2
       - name: test
         run: bash ./test_windows.sh

.golangci.yml

@@ -1,44 +0,0 @@
-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:
-  timeout: 5m
-  modules-download-mode: vendor

.yamllint.yml

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

OWNERS.md

@@ -7,4 +7,3 @@ 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

@@ -14,14 +14,13 @@ 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 single static IPv4/IPv6 address to container. It's useful in debugging purpose.
+* `static`:  Allocate a static IPv4/IPv6 addresses to container and 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 sh
+#!/usr/bin/env bash
 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 sh
+#!/usr/bin/env bash
 set -e
 cd "$(dirname "$0")"
 

go.mod

@@ -1,54 +1,40 @@
 module github.com/containernetworking/plugins
 
-go 1.23
+go 1.17
 
 require (
-	github.com/Microsoft/hcsshim v0.12.9
-	github.com/alexflint/go-filemutex v1.3.0
+	github.com/Microsoft/hcsshim v0.8.20
+	github.com/alexflint/go-filemutex v1.1.0
 	github.com/buger/jsonparser v1.1.1
-	github.com/containernetworking/cni v1.2.3
-	github.com/coreos/go-iptables v0.8.0
-	github.com/coreos/go-systemd/v22 v22.5.0
-	github.com/godbus/dbus/v5 v5.1.0
-	github.com/insomniacslk/dhcp v0.0.0-20240829085014-a3a4c1f04475
+	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/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/mattn/go-shellwords v1.0.12
-	github.com/networkplumbing/go-nft v0.4.0
-	github.com/onsi/ginkgo/v2 v2.22.2
-	github.com/onsi/gomega v1.36.2
-	github.com/opencontainers/selinux v1.11.1
-	github.com/safchain/ethtool v0.5.9
-	github.com/vishvananda/netlink v1.3.0
-	golang.org/x/sys v0.29.0
-	sigs.k8s.io/knftables v0.0.18
+	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
 )
 
 require (
-	github.com/Microsoft/go-winio v0.6.2 // indirect
-	github.com/containerd/cgroups/v3 v3.0.3 // indirect
-	github.com/containerd/errdefs v0.3.0 // indirect
-	github.com/containerd/errdefs/pkg v0.3.0 // indirect
-	github.com/containerd/typeurl/v2 v2.2.0 // indirect
-	github.com/go-logr/logr v1.4.2 // indirect
-	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
+	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/gogo/protobuf v1.3.2 // indirect
-	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/google/go-cmp v0.6.0 // indirect
-	github.com/google/pprof v0.0.0-20241210010833-40e02aabc2ad // indirect
-	github.com/josharian/native v1.1.0 // indirect
-	github.com/mdlayher/packet v1.1.2 // indirect
-	github.com/mdlayher/socket v0.5.1 // indirect
-	github.com/pierrec/lz4/v4 v4.1.21 // indirect
+	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
+	github.com/nxadm/tail v1.4.8 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
-	github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701 // indirect
-	github.com/vishvananda/netns v0.0.4 // indirect
-	go.opencensus.io v0.24.0 // indirect
-	golang.org/x/net v0.33.0 // indirect
-	golang.org/x/sync v0.10.0 // indirect
-	golang.org/x/text v0.21.0 // indirect
-	golang.org/x/tools v0.28.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 // indirect
-	google.golang.org/grpc v1.67.0 // indirect
-	google.golang.org/protobuf v1.36.1 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // 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
 )

integration/integration_linux_test.go

@@ -14,21 +14,21 @@
 package integration_test
 
 import (
-	"bytes"
 	"fmt"
-	"io"
-	"log"
 	"math/rand"
-	"net"
 	"os"
 	"os/exec"
 	"path/filepath"
+
+	"bytes"
+	"io"
+	"net"
 	"regexp"
 	"strconv"
 	"strings"
 	"time"
 
-	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"github.com/onsi/gomega/gbytes"
 	"github.com/onsi/gomega/gexec"
@@ -61,13 +61,6 @@ var _ = Describe("Basic PTP using cnitool", func() {
 			netConfPath, err := filepath.Abs("./testdata")
 			Expect(err).NotTo(HaveOccurred())
 
-			// Flush ipam stores to avoid conflicts
-			err = os.RemoveAll("/tmp/chained-ptp-bandwidth-test")
-			Expect(err).NotTo(HaveOccurred())
-
-			err = os.RemoveAll("/tmp/basic-ptp-test")
-			Expect(err).NotTo(HaveOccurred())
-
 			env = TestEnv([]string{
 				"CNI_PATH=" + cniPath,
 				"NETCONFPATH=" + netConfPath,
@@ -90,7 +83,6 @@ var _ = Describe("Basic PTP using cnitool", func() {
 			env.runInNS(hostNS, cnitoolBin, "add", netName, contNS.LongName())
 
 			addrOutput := env.runInNS(contNS, "ip", "addr")
-
 			Expect(addrOutput).To(ContainSubstring(expectedIPPrefix))
 
 			env.runInNS(hostNS, cnitoolBin, "del", netName, contNS.LongName())
@@ -154,14 +146,10 @@ var _ = Describe("Basic PTP using cnitool", func() {
 
 			chainedBridgeBandwidthEnv.runInNS(hostNS, cnitoolBin, "del", "network-chain-test", contNS1.LongName())
 			basicBridgeEnv.runInNS(hostNS, cnitoolBin, "del", "network-chain-test", contNS2.LongName())
-
-			contNS1.Del()
-			contNS2.Del()
-			hostNS.Del()
 		})
 
-		It("limits traffic only on the restricted bandwidth veth device", func() {
-			ipRegexp := regexp.MustCompile(`10\.1[12]\.2\.\d{1,3}`)
+		Measure("limits traffic only on the restricted bandwith 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())
@@ -174,30 +162,31 @@ 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 = startEchoServerInNamespace(contNS1)
+			chainedBridgeBandwidthPort, chainedBridgeBandwidthSession, err = startEchoServerInNamespace(contNS1)
+			Expect(err).ToNot(HaveOccurred())
 
 			By(fmt.Sprintf("starting echo server in %s\n\n", contNS2.ShortName()))
-			basicBridgePort, basicBridgeSession = startEchoServerInNamespace(contNS2)
+			basicBridgePort, basicBridgeSession, err = startEchoServerInNamespace(contNS2)
+			Expect(err).ToNot(HaveOccurred())
 
 			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))
-			start := time.Now()
-			makeTCPClientInNS(hostNS.ShortName(), chainedBridgeIP, chainedBridgeBandwidthPort, packetInBytes)
-			runtimeWithLimit := time.Since(start)
-			log.Printf("Runtime with qos limit %.2f seconds", runtimeWithLimit.Seconds())
+			runtimeWithLimit := b.Time("with chained bridge and bandwidth plugins", func() {
+				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))
-			start = time.Now()
-			makeTCPClientInNS(hostNS.ShortName(), basicBridgeIP, basicBridgePort, packetInBytes)
-			runtimeWithoutLimit := time.Since(start)
-			log.Printf("Runtime without qos limit %.2f seconds", runtimeWithoutLimit.Seconds())
+			runtimeWithoutLimit := b.Time("with basic bridged plugin", func() {
+				makeTcpClientInNS(hostNS.ShortName(), basicBridgeIP, basicBridgePort, packetInBytes)
+			})
 
 			Expect(runtimeWithLimit).To(BeNumerically(">", runtimeWithoutLimit+1000*time.Millisecond))
-		})
+		}, 1)
 	})
 })
 
@@ -235,7 +224,7 @@ 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)
 
@@ -254,7 +243,7 @@ func makeTCPClientInNS(netns string, address string, port int, numBytes int) {
 	Expect(string(out)).To(Equal(message))
 }
 
-func startEchoServerInNamespace(netNS Namespace) (int, *gexec.Session) {
+func startEchoServerInNamespace(netNS Namespace) (int, *gexec.Session, error) {
 	session, err := startInNetNS(echoServerBinaryPath, netNS)
 	Expect(err).NotTo(HaveOccurred())
 
@@ -271,7 +260,7 @@ func startEchoServerInNamespace(netNS Namespace) (int, *gexec.Session) {
 		io.Copy(GinkgoWriter, io.MultiReader(session.Out, session.Err))
 	}()
 
-	return port, session
+	return port, session, nil
 }
 
 func startInNetNS(binPath string, namespace Namespace) (*gexec.Session, error) {

integration/integration_suite_test.go

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

integration/testdata/basic-ptp.json

@@ -6,7 +6,6 @@
     "mtu": 512,
     "ipam": {
         "type": "host-local",
-        "subnet": "10.1.2.0/24",
-        "dataDir": "/tmp/basic-ptp-test"
+        "subnet": "10.1.2.0/24"
     }
 }

integration/testdata/chained-ptp-bandwidth.conflist

@@ -8,8 +8,7 @@
             "mtu": 512,
             "ipam": {
                 "type": "host-local",
-                "subnet": "10.9.2.0/24",
-                "dataDir": "/tmp/chained-ptp-bandwidth-test"
+                "subnet": "10.9.2.0/24"
             }
         },
         {

pkg/errors/errors_test.go

@@ -43,7 +43,7 @@ func TestAnnotate(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			if !reflect.DeepEqual(Annotate(test.existingErr, test.contextMessage), test.expectedErr) {
+			if !reflect.DeepEqual(Annotatef(test.existingErr, test.contextMessage), test.expectedErr) {
 				t.Errorf("test case %s fails", test.name)
 				return
 			}

pkg/hns/endpoint_windows.go

@@ -39,7 +39,6 @@ type EndpointInfo struct {
 	NetworkId    string
 	Gateway      net.IP
 	IpAddress    net.IP
-	MacAddress  string
 }
 
 // GetSandboxContainerID returns the sandbox ID of this pod.
@@ -249,7 +248,6 @@ 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,
@@ -282,16 +280,6 @@ 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/v2"
+	. "github.com/onsi/ginkgo"
 	. "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/v2"
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
 

pkg/ip/cidr.go

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

pkg/ip/cidr_test.go

@@ -1,247 +0,0 @@
-// 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 +47,14 @@ 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)
 	}
+}
 
 // ToIP will return a net.IP in standard form from this IP.
 // If this IP can not be converted to a valid net.IP, will return nil.

pkg/ip/ip_suite_test.go

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

pkg/ip/ip_test.go

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

pkg/ip/ipforward_linux.go

@@ -16,7 +16,7 @@ package ip
 
 import (
 	"bytes"
-	"os"
+	"io/ioutil"
 
 	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 := os.ReadFile(f); err == nil {
+	if content, err := ioutil.ReadFile(f); err == nil {
 		if bytes.Equal(bytes.TrimSpace(content), []byte("1")) {
 			return nil
 		}
 	}
-	return os.WriteFile(f, []byte("1"), 0o644)
+	return ioutil.WriteFile(f, []byte("1"), 0644)
 }

pkg/ip/ipforward_linux_test.go

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

pkg/ip/ipmasq_iptables_linux.go

@@ -1,180 +0,0 @@
-// Copyright 2015 CNI authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ip
-
-import (
-	"errors"
-	"fmt"
-	"net"
-	"strings"
-
-	"github.com/coreos/go-iptables/iptables"
-
-	"github.com/containernetworking/cni/pkg/types"
-	"github.com/containernetworking/plugins/pkg/utils"
-)
-
-// setupIPMasqIPTables is the iptables-based implementation of SetupIPMasqForNetworks
-func setupIPMasqIPTables(ipns []*net.IPNet, network, _, containerID string) error {
-	// Note: for historical reasons, the iptables implementation ignores ifname.
-	chain := utils.FormatChainName(network, containerID)
-	comment := utils.FormatComment(network, containerID)
-	for _, ip := range ipns {
-		if err := SetupIPMasq(ip, chain, comment); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// SetupIPMasq installs iptables rules to masquerade traffic
-// coming from ip of ipn and going outside of ipn.
-// Deprecated: This function only supports iptables. Use SetupIPMasqForNetworks, which
-// supports both iptables and nftables.
-func SetupIPMasq(ipn *net.IPNet, chain string, comment string) error {
-	isV6 := ipn.IP.To4() == nil
-
-	var ipt *iptables.IPTables
-	var err error
-	var multicastNet string
-
-	if isV6 {
-		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv6)
-		multicastNet = "ff00::/8"
-	} else {
-		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv4)
-		multicastNet = "224.0.0.0/4"
-	}
-	if err != nil {
-		return fmt.Errorf("failed to locate iptables: %v", err)
-	}
-
-	// Create chain if doesn't exist
-	exists := false
-	chains, err := ipt.ListChains("nat")
-	if err != nil {
-		return fmt.Errorf("failed to list chains: %v", err)
-	}
-	for _, ch := range chains {
-		if ch == chain {
-			exists = true
-			break
-		}
-	}
-	if !exists {
-		if err = ipt.NewChain("nat", chain); err != nil {
-			return err
-		}
-	}
-
-	// Packets to this network should not be touched
-	if err := ipt.AppendUnique("nat", chain, "-d", ipn.String(), "-j", "ACCEPT", "-m", "comment", "--comment", comment); err != nil {
-		return err
-	}
-
-	// Don't masquerade multicast - pods should be able to talk to other pods
-	// on the local network via multicast.
-	if err := ipt.AppendUnique("nat", chain, "!", "-d", multicastNet, "-j", "MASQUERADE", "-m", "comment", "--comment", comment); err != nil {
-		return err
-	}
-
-	// Packets from the specific IP of this network will hit the chain
-	return ipt.AppendUnique("nat", "POSTROUTING", "-s", ipn.IP.String(), "-j", chain, "-m", "comment", "--comment", comment)
-}
-
-// teardownIPMasqIPTables is the iptables-based implementation of TeardownIPMasqForNetworks
-func teardownIPMasqIPTables(ipns []*net.IPNet, network, _, containerID string) error {
-	// Note: for historical reasons, the iptables implementation ignores ifname.
-	chain := utils.FormatChainName(network, containerID)
-	comment := utils.FormatComment(network, containerID)
-
-	var errs []string
-	for _, ipn := range ipns {
-		err := TeardownIPMasq(ipn, chain, comment)
-		if err != nil {
-			errs = append(errs, err.Error())
-		}
-	}
-
-	if errs == nil {
-		return nil
-	}
-	return errors.New(strings.Join(errs, "\n"))
-}
-
-// TeardownIPMasq undoes the effects of SetupIPMasq.
-// Deprecated: This function only supports iptables. Use TeardownIPMasqForNetworks, which
-// supports both iptables and nftables.
-func TeardownIPMasq(ipn *net.IPNet, chain string, comment string) error {
-	isV6 := ipn.IP.To4() == nil
-
-	var ipt *iptables.IPTables
-	var err error
-
-	if isV6 {
-		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv6)
-	} else {
-		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv4)
-	}
-	if err != nil {
-		return fmt.Errorf("failed to locate iptables: %v", err)
-	}
-
-	err = ipt.Delete("nat", "POSTROUTING", "-s", ipn.IP.String(), "-j", chain, "-m", "comment", "--comment", comment)
-	if err != nil && !isNotExist(err) {
-		return err
-	}
-
-	// for downward compatibility
-	err = ipt.Delete("nat", "POSTROUTING", "-s", ipn.String(), "-j", chain, "-m", "comment", "--comment", comment)
-	if err != nil && !isNotExist(err) {
-		return err
-	}
-
-	err = ipt.ClearChain("nat", chain)
-	if err != nil && !isNotExist(err) {
-		return err
-	}
-
-	err = ipt.DeleteChain("nat", chain)
-	if err != nil && !isNotExist(err) {
-		return err
-	}
-
-	return nil
-}
-
-// gcIPMasqIPTables is the iptables-based implementation of GCIPMasqForNetwork
-func gcIPMasqIPTables(_ string, _ []types.GCAttachment) error {
-	// FIXME: The iptables implementation does not support GC.
-	//
-	// (In theory, it _could_ backward-compatibly support it, by adding a no-op rule
-	// with a comment indicating the network to each chain it creates, so that it
-	// could later figure out which chains corresponded to which networks; older
-	// implementations would ignore the extra rule but would still correctly delete
-	// the chain on teardown (because they ClearChain() before doing DeleteChain()).
-
-	return nil
-}
-
-// isNotExist returnst true if the error is from iptables indicating
-// that the target does not exist.
-func isNotExist(err error) bool {
-	e, ok := err.(*iptables.Error)
-	if !ok {
-		return false
-	}
-	return e.IsNotExist()
-}

pkg/ip/ipmasq_linux.go

@@ -15,78 +15,112 @@
 package ip
 
 import (
-	"errors"
 	"fmt"
 	"net"
-	"strings"
 
-	"github.com/containernetworking/cni/pkg/types"
-	"github.com/containernetworking/plugins/pkg/utils"
+	"github.com/coreos/go-iptables/iptables"
 )
 
-// SetupIPMasqForNetworks installs rules to masquerade traffic coming from ips of ipns and
-// going outside of ipns, using a chain name based on network, ifname, and containerID. The
-// backend can be either "iptables" or "nftables"; if it is nil, then a suitable default
-// implementation will be used.
-func SetupIPMasqForNetworks(backend *string, ipns []*net.IPNet, network, ifname, containerID string) error {
-	if backend == nil {
-		// Prefer iptables, unless only nftables is available
-		defaultBackend := "iptables"
-		if !utils.SupportsIPTables() && utils.SupportsNFTables() {
-			defaultBackend = "nftables"
+// SetupIPMasq installs iptables rules to masquerade traffic
+// coming from ip of ipn and going outside of ipn
+func SetupIPMasq(ipn *net.IPNet, chain string, comment string) error {
+	isV6 := ipn.IP.To4() == nil
+
+	var ipt *iptables.IPTables
+	var err error
+	var multicastNet string
+
+	if isV6 {
+		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv6)
+		multicastNet = "ff00::/8"
+	} else {
+		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv4)
+		multicastNet = "224.0.0.0/4"
 	}
-		backend = &defaultBackend
+	if err != nil {
+		return fmt.Errorf("failed to locate iptables: %v", err)
 	}
 
-	switch *backend {
-	case "iptables":
-		return setupIPMasqIPTables(ipns, network, ifname, containerID)
-	case "nftables":
-		return setupIPMasqNFTables(ipns, network, ifname, containerID)
-	default:
-		return fmt.Errorf("unknown ipmasq backend %q", *backend)
+	// Create chain if doesn't exist
+	exists := false
+	chains, err := ipt.ListChains("nat")
+	if err != nil {
+		return fmt.Errorf("failed to list chains: %v", err)
+	}
+	for _, ch := range chains {
+		if ch == chain {
+			exists = true
+			break
+		}
+	}
+	if !exists {
+		if err = ipt.NewChain("nat", chain); err != nil {
+			return err
 		}
 	}
 
-// TeardownIPMasqForNetworks undoes the effects of SetupIPMasqForNetworks
-func TeardownIPMasqForNetworks(ipns []*net.IPNet, network, ifname, containerID string) error {
-	var errs []string
-
-	// Do both the iptables and the nftables cleanup, since the pod may have been
-	// created with a different version of this plugin or a different configuration.
-
-	err := teardownIPMasqIPTables(ipns, network, ifname, containerID)
-	if err != nil && utils.SupportsIPTables() {
-		errs = append(errs, err.Error())
+	// Packets to this network should not be touched
+	if err := ipt.AppendUnique("nat", chain, "-d", ipn.String(), "-j", "ACCEPT", "-m", "comment", "--comment", comment); err != nil {
+		return err
 	}
 
-	err = teardownIPMasqNFTables(ipns, network, ifname, containerID)
-	if err != nil && utils.SupportsNFTables() {
-		errs = append(errs, err.Error())
+	// Don't masquerade multicast - pods should be able to talk to other pods
+	// on the local network via multicast.
+	if err := ipt.AppendUnique("nat", chain, "!", "-d", multicastNet, "-j", "MASQUERADE", "-m", "comment", "--comment", comment); err != nil {
+		return err
+	}
+
+	// Packets from the specific IP of this network will hit the chain
+	return ipt.AppendUnique("nat", "POSTROUTING", "-s", ipn.IP.String(), "-j", chain, "-m", "comment", "--comment", comment)
+}
+
+// TeardownIPMasq undoes the effects of SetupIPMasq
+func TeardownIPMasq(ipn *net.IPNet, chain string, comment string) error {
+	isV6 := ipn.IP.To4() == nil
+
+	var ipt *iptables.IPTables
+	var err error
+
+	if isV6 {
+		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv6)
+	} else {
+		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv4)
+	}
+	if err != nil {
+		return fmt.Errorf("failed to locate iptables: %v", err)
+	}
+
+	err = ipt.Delete("nat", "POSTROUTING", "-s", ipn.IP.String(), "-j", chain, "-m", "comment", "--comment", comment)
+	if err != nil && !isNotExist(err) {
+		return err
+	}
+
+	// for downward compatibility
+	err = ipt.Delete("nat", "POSTROUTING", "-s", ipn.String(), "-j", chain, "-m", "comment", "--comment", comment)
+	if err != nil && !isNotExist(err) {
+		return err
+	}
+
+	err = ipt.ClearChain("nat", chain)
+	if err != nil && !isNotExist(err) {
+		return err
+
+	}
+
+	err = ipt.DeleteChain("nat", chain)
+	if err != nil && !isNotExist(err) {
+		return err
 	}
 
-	if errs == nil {
 	return nil
 }
-	return errors.New(strings.Join(errs, "\n"))
-}
 
-// GCIPMasqForNetwork garbage collects stale IPMasq entries for network
-func GCIPMasqForNetwork(network string, attachments []types.GCAttachment) error {
-	var errs []string
-
-	err := gcIPMasqIPTables(network, attachments)
-	if err != nil && utils.SupportsIPTables() {
-		errs = append(errs, err.Error())
+// isNotExist returnst true if the error is from iptables indicating
+// that the target does not exist.
+func isNotExist(err error) bool {
+	e, ok := err.(*iptables.Error)
+	if !ok {
+		return false
 	}
-
-	err = gcIPMasqNFTables(network, attachments)
-	if err != nil && utils.SupportsNFTables() {
-		errs = append(errs, err.Error())
-	}
-
-	if errs == nil {
-		return nil
-	}
-	return errors.New(strings.Join(errs, "\n"))
+	return e.IsNotExist()
 }

pkg/ip/ipmasq_nftables_linux.go

@@ -1,231 +0,0 @@
-// Copyright 2023 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 (
-	"context"
-	"fmt"
-	"net"
-	"strings"
-
-	"sigs.k8s.io/knftables"
-
-	"github.com/containernetworking/cni/pkg/types"
-	"github.com/containernetworking/plugins/pkg/utils"
-)
-
-const (
-	ipMasqTableName = "cni_plugins_masquerade"
-	ipMasqChainName = "masq_checks"
-)
-
-// The nftables ipmasq implementation is mostly like the iptables implementation, with
-// minor updates to fix a bug (adding `ifname`) and to allow future GC support.
-//
-// We add a rule for each mapping, with a comment containing a hash of its identifiers,
-// so that we can later reliably delete the rules we want. (This is important because in
-// edge cases, it's possible the plugin might see "ADD container A with IP 192.168.1.3",
-// followed by "ADD container B with IP 192.168.1.3" followed by "DEL container A with IP
-// 192.168.1.3", and we need to make sure that the DEL causes us to delete the rule for
-// container A, and not the rule for container B.)
-//
-// It would be more nftables-y to have a chain with a single rule doing a lookup against a
-// set with an element per mapping, rather than having a chain with a rule per mapping.
-// But there's no easy, non-racy way to say "delete the element 192.168.1.3 from the set,
-// but only if it was added for container A, not if it was added for container B".
-
-// hashForNetwork returns a unique hash for this network
-func hashForNetwork(network string) string {
-	return utils.MustFormatHashWithPrefix(16, "", network)
-}
-
-// hashForInstance returns a unique hash identifying the rules for this
-// network/ifname/containerID
-func hashForInstance(network, ifname, containerID string) string {
-	return hashForNetwork(network) + "-" + utils.MustFormatHashWithPrefix(16, "", ifname+":"+containerID)
-}
-
-// commentForInstance returns a comment string that begins with a unique hash and
-// ends with a (possibly-truncated) human-readable description.
-func commentForInstance(network, ifname, containerID string) string {
-	comment := fmt.Sprintf("%s, net: %s, if: %s, id: %s",
-		hashForInstance(network, ifname, containerID),
-		strings.ReplaceAll(network, `"`, ``),
-		strings.ReplaceAll(ifname, `"`, ``),
-		strings.ReplaceAll(containerID, `"`, ``),
-	)
-	if len(comment) > knftables.CommentLengthMax {
-		comment = comment[:knftables.CommentLengthMax]
-	}
-	return comment
-}
-
-// setupIPMasqNFTables is the nftables-based implementation of SetupIPMasqForNetworks
-func setupIPMasqNFTables(ipns []*net.IPNet, network, ifname, containerID string) error {
-	nft, err := knftables.New(knftables.InetFamily, ipMasqTableName)
-	if err != nil {
-		return err
-	}
-	return setupIPMasqNFTablesWithInterface(nft, ipns, network, ifname, containerID)
-}
-
-func setupIPMasqNFTablesWithInterface(nft knftables.Interface, ipns []*net.IPNet, network, ifname, containerID string) error {
-	staleRules, err := findRules(nft, hashForInstance(network, ifname, containerID))
-	if err != nil {
-		return err
-	}
-
-	tx := nft.NewTransaction()
-
-	// Ensure that our table and chains exist.
-	tx.Add(&knftables.Table{
-		Comment: knftables.PtrTo("Masquerading for plugins from github.com/containernetworking/plugins"),
-	})
-	tx.Add(&knftables.Chain{
-		Name:    ipMasqChainName,
-		Comment: knftables.PtrTo("Masquerade traffic from certain IPs to any (non-multicast) IP outside their subnet"),
-	})
-
-	// Ensure that the postrouting chain exists and has the correct rules. (Has to be
-	// done after creating ipMasqChainName, so we can jump to it.)
-	tx.Add(&knftables.Chain{
-		Name:     "postrouting",
-		Type:     knftables.PtrTo(knftables.NATType),
-		Hook:     knftables.PtrTo(knftables.PostroutingHook),
-		Priority: knftables.PtrTo(knftables.SNATPriority),
-	})
-	tx.Flush(&knftables.Chain{
-		Name: "postrouting",
-	})
-	tx.Add(&knftables.Rule{
-		Chain: "postrouting",
-		Rule:  "ip daddr == 224.0.0.0/4  return",
-	})
-	tx.Add(&knftables.Rule{
-		Chain: "postrouting",
-		Rule:  "ip6 daddr == ff00::/8  return",
-	})
-	tx.Add(&knftables.Rule{
-		Chain: "postrouting",
-		Rule: knftables.Concat(
-			"goto", ipMasqChainName,
-		),
-	})
-
-	// Delete stale rules, add new rules to masquerade chain
-	for _, rule := range staleRules {
-		tx.Delete(rule)
-	}
-	for _, ipn := range ipns {
-		ip := "ip"
-		if ipn.IP.To4() == nil {
-			ip = "ip6"
-		}
-
-		// e.g. if ipn is "192.168.1.4/24", then dstNet is "192.168.1.0/24"
-		dstNet := &net.IPNet{IP: ipn.IP.Mask(ipn.Mask), Mask: ipn.Mask}
-
-		tx.Add(&knftables.Rule{
-			Chain: ipMasqChainName,
-			Rule: knftables.Concat(
-				ip, "saddr", "==", ipn.IP,
-				ip, "daddr", "!=", dstNet,
-				"masquerade",
-			),
-			Comment: knftables.PtrTo(commentForInstance(network, ifname, containerID)),
-		})
-	}
-
-	return nft.Run(context.TODO(), tx)
-}
-
-// teardownIPMasqNFTables is the nftables-based implementation of TeardownIPMasqForNetworks
-func teardownIPMasqNFTables(ipns []*net.IPNet, network, ifname, containerID string) error {
-	nft, err := knftables.New(knftables.InetFamily, ipMasqTableName)
-	if err != nil {
-		return err
-	}
-	return teardownIPMasqNFTablesWithInterface(nft, ipns, network, ifname, containerID)
-}
-
-func teardownIPMasqNFTablesWithInterface(nft knftables.Interface, _ []*net.IPNet, network, ifname, containerID string) error {
-	rules, err := findRules(nft, hashForInstance(network, ifname, containerID))
-	if err != nil {
-		return err
-	} else if len(rules) == 0 {
-		return nil
-	}
-
-	tx := nft.NewTransaction()
-	for _, rule := range rules {
-		tx.Delete(rule)
-	}
-	return nft.Run(context.TODO(), tx)
-}
-
-// gcIPMasqNFTables is the nftables-based implementation of GCIPMasqForNetwork
-func gcIPMasqNFTables(network string, attachments []types.GCAttachment) error {
-	nft, err := knftables.New(knftables.InetFamily, ipMasqTableName)
-	if err != nil {
-		return err
-	}
-	return gcIPMasqNFTablesWithInterface(nft, network, attachments)
-}
-
-func gcIPMasqNFTablesWithInterface(nft knftables.Interface, network string, attachments []types.GCAttachment) error {
-	// Find all rules for the network
-	rules, err := findRules(nft, hashForNetwork(network))
-	if err != nil {
-		return err
-	} else if len(rules) == 0 {
-		return nil
-	}
-
-	// Compute the comments for all elements of attachments
-	validAttachments := map[string]bool{}
-	for _, attachment := range attachments {
-		validAttachments[commentForInstance(network, attachment.IfName, attachment.ContainerID)] = true
-	}
-
-	// Delete anything in rules that isn't in validAttachments
-	tx := nft.NewTransaction()
-	for _, rule := range rules {
-		if !validAttachments[*rule.Comment] {
-			tx.Delete(rule)
-		}
-	}
-	return nft.Run(context.TODO(), tx)
-}
-
-// findRules finds rules with comments that start with commentPrefix.
-func findRules(nft knftables.Interface, commentPrefix string) ([]*knftables.Rule, error) {
-	rules, err := nft.ListRules(context.TODO(), ipMasqChainName)
-	if err != nil {
-		if knftables.IsNotFound(err) {
-			// If ipMasqChainName doesn't exist yet, that's fine
-			return nil, nil
-		}
-		return nil, err
-	}
-
-	matchingRules := make([]*knftables.Rule, 0, 1)
-	for _, rule := range rules {
-		if rule.Comment != nil && strings.HasPrefix(*rule.Comment, commentPrefix) {
-			matchingRules = append(matchingRules, rule)
-		}
-	}
-
-	return matchingRules, nil
-}

pkg/ip/ipmasq_nftables_linux_test.go

@@ -1,213 +0,0 @@
-// Copyright 2023 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"
-	"strings"
-	"testing"
-
-	"github.com/vishvananda/netlink"
-	"sigs.k8s.io/knftables"
-
-	"github.com/containernetworking/cni/pkg/types"
-)
-
-func Test_setupIPMasqNFTables(t *testing.T) {
-	nft := knftables.NewFake(knftables.InetFamily, ipMasqTableName)
-
-	containers := []struct {
-		network     string
-		ifname      string
-		containerID string
-		addrs       []string
-	}{
-		{
-			network:     "unit-test",
-			ifname:      "eth0",
-			containerID: "one",
-			addrs:       []string{"192.168.1.1/24"},
-		},
-		{
-			network:     "unit-test",
-			ifname:      "eth0",
-			containerID: "two",
-			addrs:       []string{"192.168.1.2/24", "2001:db8::2/64"},
-		},
-		{
-			network:     "unit-test",
-			ifname:      "eth0",
-			containerID: "three",
-			addrs:       []string{"192.168.99.5/24"},
-		},
-		{
-			network:     "alternate",
-			ifname:      "net1",
-			containerID: "three",
-			addrs: []string{
-				"10.0.0.5/24",
-				"10.0.0.6/24",
-				"10.0.1.7/24",
-				"2001:db8::5/64",
-				"2001:db8::6/64",
-				"2001:db8:1::7/64",
-			},
-		},
-	}
-
-	for _, c := range containers {
-		ipns := []*net.IPNet{}
-		for _, addr := range c.addrs {
-			nladdr, err := netlink.ParseAddr(addr)
-			if err != nil {
-				t.Fatalf("failed to parse test addr: %v", err)
-			}
-			ipns = append(ipns, nladdr.IPNet)
-		}
-		err := setupIPMasqNFTablesWithInterface(nft, ipns, c.network, c.ifname, c.containerID)
-		if err != nil {
-			t.Fatalf("error from setupIPMasqNFTables: %v", err)
-		}
-
-	}
-
-	expected := strings.TrimSpace(`
-add table inet cni_plugins_masquerade { comment "Masquerading for plugins from github.com/containernetworking/plugins" ; }
-add chain inet cni_plugins_masquerade masq_checks { comment "Masquerade traffic from certain IPs to any (non-multicast) IP outside their subnet" ; }
-add chain inet cni_plugins_masquerade postrouting { type nat hook postrouting priority 100 ; }
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 192.168.1.1 ip daddr != 192.168.1.0/24 masquerade comment "6fd94d501e58f0aa-287fc69eff0574a2, net: unit-test, if: eth0, id: one"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 192.168.1.2 ip daddr != 192.168.1.0/24 masquerade comment "6fd94d501e58f0aa-d750b2c8f0f25d5f, net: unit-test, if: eth0, id: two"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::2 ip6 daddr != 2001:db8::/64 masquerade comment "6fd94d501e58f0aa-d750b2c8f0f25d5f, net: unit-test, if: eth0, id: two"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 192.168.99.5 ip daddr != 192.168.99.0/24 masquerade comment "6fd94d501e58f0aa-a4d4adb82b669cfe, net: unit-test, if: eth0, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.0.5 ip daddr != 10.0.0.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.0.6 ip daddr != 10.0.0.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.1.7 ip daddr != 10.0.1.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::5 ip6 daddr != 2001:db8::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::6 ip6 daddr != 2001:db8::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8:1::7 ip6 daddr != 2001:db8:1::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade postrouting ip daddr == 224.0.0.0/4  return
-add rule inet cni_plugins_masquerade postrouting ip6 daddr == ff00::/8  return
-add rule inet cni_plugins_masquerade postrouting goto masq_checks
-`)
-	dump := strings.TrimSpace(nft.Dump())
-	if dump != expected {
-		t.Errorf("expected nftables state:\n%s\n\nactual:\n%s\n\n", expected, dump)
-	}
-
-	// Add a new container reusing "one"'s address, before deleting "one"
-	c := containers[0]
-	addr, err := netlink.ParseAddr(c.addrs[0])
-	if err != nil {
-		t.Fatalf("failed to parse test addr: %v", err)
-	}
-	err = setupIPMasqNFTablesWithInterface(nft, []*net.IPNet{addr.IPNet}, "unit-test", "eth0", "four")
-	if err != nil {
-		t.Fatalf("error from setupIPMasqNFTables: %v", err)
-	}
-
-	// Remove "one"
-	err = teardownIPMasqNFTablesWithInterface(nft, []*net.IPNet{addr.IPNet}, c.network, c.ifname, c.containerID)
-	if err != nil {
-		t.Fatalf("error from teardownIPMasqNFTables: %v", err)
-	}
-
-	// Check that "one" was deleted (and "four" wasn't)
-	expected = strings.TrimSpace(`
-add table inet cni_plugins_masquerade { comment "Masquerading for plugins from github.com/containernetworking/plugins" ; }
-add chain inet cni_plugins_masquerade masq_checks { comment "Masquerade traffic from certain IPs to any (non-multicast) IP outside their subnet" ; }
-add chain inet cni_plugins_masquerade postrouting { type nat hook postrouting priority 100 ; }
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 192.168.1.2 ip daddr != 192.168.1.0/24 masquerade comment "6fd94d501e58f0aa-d750b2c8f0f25d5f, net: unit-test, if: eth0, id: two"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::2 ip6 daddr != 2001:db8::/64 masquerade comment "6fd94d501e58f0aa-d750b2c8f0f25d5f, net: unit-test, if: eth0, id: two"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 192.168.99.5 ip daddr != 192.168.99.0/24 masquerade comment "6fd94d501e58f0aa-a4d4adb82b669cfe, net: unit-test, if: eth0, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.0.5 ip daddr != 10.0.0.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.0.6 ip daddr != 10.0.0.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.1.7 ip daddr != 10.0.1.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::5 ip6 daddr != 2001:db8::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::6 ip6 daddr != 2001:db8::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8:1::7 ip6 daddr != 2001:db8:1::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 192.168.1.1 ip daddr != 192.168.1.0/24 masquerade comment "6fd94d501e58f0aa-e766de567ef6c543, net: unit-test, if: eth0, id: four"
-add rule inet cni_plugins_masquerade postrouting ip daddr == 224.0.0.0/4  return
-add rule inet cni_plugins_masquerade postrouting ip6 daddr == ff00::/8  return
-add rule inet cni_plugins_masquerade postrouting goto masq_checks
-`)
-	dump = strings.TrimSpace(nft.Dump())
-	if dump != expected {
-		t.Errorf("expected nftables state:\n%s\n\nactual:\n%s\n\n", expected, dump)
-	}
-
-	// GC "four" from the "unit-test" network
-	err = gcIPMasqNFTablesWithInterface(nft, "unit-test", []types.GCAttachment{
-		{IfName: "eth0", ContainerID: "two"},
-		{IfName: "eth0", ContainerID: "three"},
-		// (irrelevant extra element)
-		{IfName: "eth0", ContainerID: "one"},
-	})
-	if err != nil {
-		t.Fatalf("error from gcIPMasqNFTables: %v", err)
-	}
-	// GC the "alternate" network without removing anything
-	err = gcIPMasqNFTablesWithInterface(nft, "alternate", []types.GCAttachment{
-		{IfName: "net1", ContainerID: "three"},
-	})
-	if err != nil {
-		t.Fatalf("error from gcIPMasqNFTables: %v", err)
-	}
-
-	// Re-dump
-	expected = strings.TrimSpace(`
-add table inet cni_plugins_masquerade { comment "Masquerading for plugins from github.com/containernetworking/plugins" ; }
-add chain inet cni_plugins_masquerade masq_checks { comment "Masquerade traffic from certain IPs to any (non-multicast) IP outside their subnet" ; }
-add chain inet cni_plugins_masquerade postrouting { type nat hook postrouting priority 100 ; }
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 192.168.1.2 ip daddr != 192.168.1.0/24 masquerade comment "6fd94d501e58f0aa-d750b2c8f0f25d5f, net: unit-test, if: eth0, id: two"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::2 ip6 daddr != 2001:db8::/64 masquerade comment "6fd94d501e58f0aa-d750b2c8f0f25d5f, net: unit-test, if: eth0, id: two"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 192.168.99.5 ip daddr != 192.168.99.0/24 masquerade comment "6fd94d501e58f0aa-a4d4adb82b669cfe, net: unit-test, if: eth0, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.0.5 ip daddr != 10.0.0.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.0.6 ip daddr != 10.0.0.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip saddr == 10.0.1.7 ip daddr != 10.0.1.0/24 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::5 ip6 daddr != 2001:db8::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8::6 ip6 daddr != 2001:db8::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade masq_checks ip6 saddr == 2001:db8:1::7 ip6 daddr != 2001:db8:1::/64 masquerade comment "82783ef24bdc7036-acb19d111858e348, net: alternate, if: net1, id: three"
-add rule inet cni_plugins_masquerade postrouting ip daddr == 224.0.0.0/4  return
-add rule inet cni_plugins_masquerade postrouting ip6 daddr == ff00::/8  return
-add rule inet cni_plugins_masquerade postrouting goto masq_checks
-`)
-	dump = strings.TrimSpace(nft.Dump())
-	if dump != expected {
-		t.Errorf("expected nftables state:\n%s\n\nactual:\n%s\n\n", expected, dump)
-	}
-
-	// GC everything
-	err = gcIPMasqNFTablesWithInterface(nft, "unit-test", []types.GCAttachment{})
-	if err != nil {
-		t.Fatalf("error from gcIPMasqNFTables: %v", err)
-	}
-	err = gcIPMasqNFTablesWithInterface(nft, "alternate", []types.GCAttachment{})
-	if err != nil {
-		t.Fatalf("error from gcIPMasqNFTables: %v", err)
-	}
-
-	expected = strings.TrimSpace(`
-add table inet cni_plugins_masquerade { comment "Masquerading for plugins from github.com/containernetworking/plugins" ; }
-add chain inet cni_plugins_masquerade masq_checks { comment "Masquerade traffic from certain IPs to any (non-multicast) IP outside their subnet" ; }
-add chain inet cni_plugins_masquerade postrouting { type nat hook postrouting priority 100 ; }
-add rule inet cni_plugins_masquerade postrouting ip daddr == 224.0.0.0/4  return
-add rule inet cni_plugins_masquerade postrouting ip6 daddr == ff00::/8  return
-add rule inet cni_plugins_masquerade postrouting goto masq_checks
-`)
-	dump = strings.TrimSpace(nft.Dump())
-	if dump != expected {
-		t.Errorf("expected nftables state:\n%s\n\nactual:\n%s\n\n", expected, dump)
-	}
-}

pkg/ip/link_linux.go

@@ -28,16 +28,17 @@ 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) {
-	linkAttrs := netlink.NewLinkAttrs()
-	linkAttrs.Name = name
-	linkAttrs.MTU = mtu
-
 	veth := &netlink.Veth{
-		LinkAttrs:     linkAttrs,
+		LinkAttrs: netlink.LinkAttrs{
+			Name: name,
+			MTU:  mtu,
+		},
 		PeerName:      peer,
 		PeerNamespace: netlink.NsFd(int(hostNS.Fd())),
 	}
@@ -68,37 +69,38 @@ func peerExists(name string) bool {
 	return true
 }
 
-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
+func makeVeth(name, vethPeerName string, mtu int, mac string, hostNS ns.NetNS) (peerName string, veth netlink.Link, err error) {
 	for i := 0; i < 10; i++ {
 		if vethPeerName != "" {
 			peerName = vethPeerName
 		} else {
 			peerName, err = RandomVethName()
 			if err != nil {
-				return peerName, nil, err
+				return
 			}
 		}
 
 		veth, err = makeVethPair(name, peerName, mtu, mac, hostNS)
 		switch {
 		case err == nil:
-			return peerName, veth, nil
+			return
 
 		case os.IsExist(err):
 			if peerExists(peerName) && vethPeerName == "" {
 				continue
 			}
-			return peerName, veth, fmt.Errorf("container veth name (%q) peer provided (%q) already exists", name, peerName)
+			err = fmt.Errorf("container veth name provided (%v) already exists", name)
+			return
+
 		default:
-			return peerName, veth, fmt.Errorf("failed to make veth pair: %v", err)
+			err = fmt.Errorf("failed to make veth pair: %v", err)
+			return
 		}
 	}
 
 	// should really never be hit
-	return peerName, nil, fmt.Errorf("failed to find a unique veth name")
+	err = fmt.Errorf("failed to find a unique veth name")
+	return
 }
 
 // RandomVethName returns string "veth" with random prefix (hashed from entropy)

pkg/ip/link_linux_test.go

@@ -20,15 +20,22 @@ import (
 	"fmt"
 	"net"
 
-	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/ginkgo"
 	. "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"
@@ -149,9 +156,9 @@ var _ = Describe("Link", func() {
 		It("returns useful error", func() {
 			_ = containerNetNS.Do(func(ns.NetNS) error {
 				defer GinkgoRecover()
-				testHostVethName := "test" + hostVethName
-				_, _, err := ip.SetupVethWithName(containerVethName, testHostVethName, mtu, "", hostNetNS)
-				Expect(err.Error()).To(Equal(fmt.Sprintf("container veth name (%q) peer provided (%q) already exists", containerVethName, testHostVethName)))
+
+				_, _, err := ip.SetupVeth(containerVethName, mtu, "", hostNetNS)
+				Expect(err.Error()).To(Equal(fmt.Sprintf("container veth name provided (%s) already exists", containerVethName)))
 
 				return nil
 			})
@@ -180,8 +187,9 @@ var _ = Describe("Link", func() {
 		It("returns useful error", func() {
 			_ = containerNetNS.Do(func(ns.NetNS) error {
 				defer GinkgoRecover()
-				_, _, err := ip.SetupVethWithName(containerVethName, hostVethName, mtu, "", hostNetNS)
-				Expect(err.Error()).To(Equal(fmt.Sprintf("container veth name (%q) peer provided (%q) already exists", containerVethName, hostVethName)))
+				_, _, err := ip.SetupVeth(containerVethName, mtu, "", hostNetNS)
+				Expect(err.Error()).To(HavePrefix("container veth name provided"))
+				Expect(err.Error()).To(HaveSuffix("already exists"))
 				return nil
 			})
 		})
@@ -282,7 +290,7 @@ var _ = Describe("Link", func() {
 			// this will delete the host endpoint too
 			addr, err := ip.DelLinkByNameAddr(containerVethName)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(addr).To(BeEmpty())
+			Expect(addr).To(HaveLen(0))
 			return nil
 		})
 	})

pkg/ip/route_linux.go

@@ -42,24 +42,6 @@ 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 {
-	var defNet *net.IPNet
-	if gw.To4() != nil {
-		_, defNet, _ = net.ParseCIDR("0.0.0.0/0")
-	} else {
-		_, defNet, _ = net.ParseCIDR("::/0")
-	}
+	_, defNet, _ := net.ParseCIDR("0.0.0.0/0")
 	return AddRoute(defNet, gw, dev)
 }
-
-// IsIPNetZero check if the IPNet is "0.0.0.0/0" or "::/0"
-// This is needed as go-netlink replaces nil Dst with a '0' IPNet since
-// https://github.com/vishvananda/netlink/commit/acdc658b8613655ddb69f978e9fb4cf413e2b830
-func IsIPNetZero(ipnet *net.IPNet) bool {
-	if ipnet == nil {
-		return true
-	}
-	if ones, _ := ipnet.Mask.Size(); ones != 0 {
-		return false
-	}
-	return ipnet.IP.Equal(net.IPv4zero) || ipnet.IP.Equal(net.IPv6zero)
-}

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}
@@ -49,15 +49,12 @@ func ValidateExpectedInterfaceIPs(ifName string, resultIPs []*current.IPConfig)
 				break
 			}
 		}
-		if !match {
+		if match == false {
 			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
@@ -80,13 +77,11 @@ 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
-		if route.GW != nil {
-			routeFilter |= netlink.RT_FILTER_GW
-		}
+		routeFilter := netlink.RT_FILTER_DST | netlink.RT_FILTER_GW
 		var family int
 
 		switch {

pkg/ipam/ipam.go

@@ -16,7 +16,6 @@ package ipam
 
 import (
 	"context"
-
 	"github.com/containernetworking/cni/pkg/invoke"
 	"github.com/containernetworking/cni/pkg/types"
 )
@@ -32,7 +31,3 @@ func ExecCheck(plugin string, netconf []byte) error {
 func ExecDel(plugin string, netconf []byte) error {
 	return invoke.DelegateDel(context.TODO(), plugin, netconf, nil)
 }
-
-func ExecStatus(plugin string, netconf []byte) error {
-	return invoke.DelegateStatus(context.TODO(), plugin, netconf, nil)
-}

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
-	hasEnabledIpv6 := false
+	var has_enabled_ipv6 bool = 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 !hasEnabledIpv6 && ipc.Address.IP.To4() == nil {
+		if !has_enabled_ipv6 && 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)
 				}
 			}
-			hasEnabledIpv6 = true
+			has_enabled_ipv6 = true
 		}
 
 		addr := &netlink.Addr{IPNet: &ipc.Address, Label: ""}
@@ -117,27 +117,10 @@ func ConfigureIface(ifName string, res *current.Result) error {
 			Dst:       &r.Dst,
 			LinkIndex: link.Attrs().Index,
 			Gw:        gw,
-			Priority:  r.Priority,
-		}
-
-		if r.Table != nil {
-			route.Table = *r.Table
-		}
-
-		if r.Scope != nil {
-			route.Scope = netlink.Scope(*r.Scope)
-		}
-
-		if r.Table != nil {
-			route.Table = *r.Table
-		}
-
-		if r.Scope != nil {
-			route.Scope = netlink.Scope(*r.Scope)
 		}
 
 		if err = netlink.RouteAddEcmp(&route); err != nil {
-			return fmt.Errorf("failed to add route '%v via %v dev %v metric %d (Scope: %v, Table: %d)': %v", r.Dst, gw, ifName, r.Priority, route.Scope, route.Table, err)
+			return fmt.Errorf("failed to add route '%v via %v dev %v': %v", r.Dst, gw, ifName, err)
 		}
 	}
 

pkg/ipam/ipam_linux_test.go

@@ -18,14 +18,15 @@ 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"
@@ -41,11 +42,9 @@ func ipNetEqual(a, b *net.IPNet) bool {
 
 var _ = Describe("ConfigureIface", func() {
 	var originalNS ns.NetNS
-	var ipv4, ipv6, routev4, routev6, routev4Scope *net.IPNet
+	var ipv4, ipv6, routev4, routev6 *net.IPNet
 	var ipgw4, ipgw6, routegwv4, routegwv6 net.IP
-	var routeScope int
 	var result *current.Result
-	var routeTable int
 
 	BeforeEach(func() {
 		// Create a new NetNS so we don't modify the host
@@ -56,12 +55,11 @@ var _ = Describe("ConfigureIface", func() {
 		err = originalNS.Do(func(ns.NetNS) error {
 			defer GinkgoRecover()
 
-			linkAttrs := netlink.NewLinkAttrs()
-			linkAttrs.Name = LINK_NAME
-
 			// Add master
 			err = netlink.LinkAdd(&netlink.Dummy{
-				LinkAttrs: linkAttrs,
+				LinkAttrs: netlink.LinkAttrs{
+					Name: LINK_NAME,
+				},
 			})
 			Expect(err).NotTo(HaveOccurred())
 			_, err = netlink.LinkByName(LINK_NAME)
@@ -80,10 +78,6 @@ var _ = Describe("ConfigureIface", func() {
 		routegwv4 = net.ParseIP("1.2.3.5")
 		Expect(routegwv4).NotTo(BeNil())
 
-		_, routev4Scope, err = net.ParseCIDR("1.2.3.4/32")
-		Expect(err).NotTo(HaveOccurred())
-		Expect(routev4Scope).NotTo(BeNil())
-
 		ipgw4 = net.ParseIP("1.2.3.1")
 		Expect(ipgw4).NotTo(BeNil())
 
@@ -100,9 +94,6 @@ var _ = Describe("ConfigureIface", func() {
 		ipgw6 = net.ParseIP("abcd:1234:ffff::1")
 		Expect(ipgw6).NotTo(BeNil())
 
-		routeTable := 5000
-		routeScope = 200
-
 		result = &current.Result{
 			Interfaces: []*current.Interface{
 				{
@@ -131,8 +122,6 @@ var _ = Describe("ConfigureIface", func() {
 			Routes: []*types.Route{
 				{Dst: *routev4, GW: routegwv4},
 				{Dst: *routev6, GW: routegwv6},
-				{Dst: *routev4, GW: routegwv4, Table: &routeTable},
-				{Dst: *routev4Scope, Scope: &routeScope},
 			},
 		}
 	})
@@ -154,12 +143,12 @@ var _ = Describe("ConfigureIface", func() {
 
 			v4addrs, err := netlink.AddrList(link, syscall.AF_INET)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(v4addrs).To(HaveLen(1))
-			Expect(ipNetEqual(v4addrs[0].IPNet, ipv4)).To(BeTrue())
+			Expect(len(v4addrs)).To(Equal(1))
+			Expect(ipNetEqual(v4addrs[0].IPNet, ipv4)).To(Equal(true))
 
 			v6addrs, err := netlink.AddrList(link, syscall.AF_INET6)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(v6addrs).To(HaveLen(2))
+			Expect(len(v6addrs)).To(Equal(2))
 
 			var found bool
 			for _, a := range v6addrs {
@@ -168,13 +157,13 @@ var _ = Describe("ConfigureIface", func() {
 					break
 				}
 			}
-			Expect(found).To(BeTrue())
+			Expect(found).To(Equal(true))
 
 			// Ensure the v4 route, v6 route, and subnet route
 			routes, err := netlink.RouteList(link, 0)
 			Expect(err).NotTo(HaveOccurred())
 
-			var v4found, v6found, v4Scopefound bool
+			var v4found, v6found bool
 			for _, route := range routes {
 				isv4 := route.Dst.IP.To4() != nil
 				if isv4 && ipNetEqual(route.Dst, routev4) && route.Gw.Equal(routegwv4) {
@@ -183,17 +172,13 @@ var _ = Describe("ConfigureIface", func() {
 				if !isv4 && ipNetEqual(route.Dst, routev6) && route.Gw.Equal(routegwv6) {
 					v6found = true
 				}
-				if isv4 && ipNetEqual(route.Dst, routev4Scope) && int(route.Scope) == routeScope {
-					v4Scopefound = true
-				}
 
-				if v4found && v6found && v4Scopefound {
+				if v4found && v6found {
 					break
 				}
 			}
-			Expect(v4found).To(BeTrue())
-			Expect(v6found).To(BeTrue())
-			Expect(v4Scopefound).To(BeTrue())
+			Expect(v4found).To(Equal(true))
+			Expect(v6found).To(Equal(true))
 
 			return nil
 		})
@@ -217,7 +202,7 @@ var _ = Describe("ConfigureIface", func() {
 			routes, err := netlink.RouteList(link, 0)
 			Expect(err).NotTo(HaveOccurred())
 
-			var v4found, v6found, v4Tablefound bool
+			var v4found, v6found bool
 			for _, route := range routes {
 				isv4 := route.Dst.IP.To4() != nil
 				if isv4 && ipNetEqual(route.Dst, routev4) && route.Gw.Equal(ipgw4) {
@@ -231,31 +216,8 @@ var _ = Describe("ConfigureIface", func() {
 					break
 				}
 			}
-			Expect(v4found).To(BeTrue())
-			Expect(v6found).To(BeTrue())
-
-			// Need to read all tables, so cannot use RouteList
-			routeFilter := &netlink.Route{
-				Table: routeTable,
-			}
-
-			routes, err = netlink.RouteListFiltered(netlink.FAMILY_ALL,
-				routeFilter,
-				netlink.RT_FILTER_TABLE)
-			Expect(err).NotTo(HaveOccurred())
-
-			for _, route := range routes {
-				isv4 := route.Dst.IP.To4() != nil
-				if isv4 && ipNetEqual(route.Dst, routev4) && route.Gw.Equal(ipgw4) {
-					v4Tablefound = true
-				}
-
-				if v4Tablefound {
-					break
-				}
-			}
-
-			Expect(v4Tablefound).To(BeTrue())
+			Expect(v4found).To(Equal(true))
+			Expect(v6found).To(Equal(true))
 
 			return nil
 		})

pkg/ipam/ipam_suite_test.go

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

pkg/link/link_suite_test.go

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

pkg/link/spoofcheck.go

@@ -15,10 +15,8 @@
 package link
 
 import (
-	"context"
 	"fmt"
 	"os"
-	"time"
 
 	"github.com/networkplumbing/go-nft/nft"
 	"github.com/networkplumbing/go-nft/nft/schema"
@@ -30,8 +28,8 @@ const (
 )
 
 type NftConfigurer interface {
-	Apply(*nft.Config) (*nft.Config, error)
-	Read(filterCommands ...string) (*nft.Config, error)
+	Apply(*nft.Config) error
+	Read() (*nft.Config, error)
 }
 
 type SpoofChecker struct {
@@ -39,23 +37,16 @@ type SpoofChecker struct {
 	macAddress string
 	refID      string
 	configurer NftConfigurer
-	rulestore  *nft.Config
 }
 
 type defaultNftConfigurer struct{}
 
-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) Apply(cfg *nft.Config) error {
+	return nft.ApplyConfig(cfg)
 }
 
-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 (_ defaultNftConfigurer) Read() (*nft.Config, error) {
+	return nft.ReadConfig()
 }
 
 func NewSpoofChecker(iface, macAddress, refID string) *SpoofChecker {
@@ -63,7 +54,7 @@ func NewSpoofChecker(iface, macAddress, refID string) *SpoofChecker {
 }
 
 func NewSpoofCheckerWithConfigurer(iface, macAddress, refID string, configurer NftConfigurer) *SpoofChecker {
-	return &SpoofChecker{iface, macAddress, refID, configurer, nil}
+	return &SpoofChecker{iface, macAddress, refID, configurer}
 }
 
 // Setup applies nftables configuration to restrict traffic
@@ -92,7 +83,7 @@ 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)
 	}
 
@@ -106,59 +97,45 @@ func (sc *SpoofChecker) Setup() error {
 	rulesConfig.AddRule(sc.matchMacRule(macChain.Name))
 	rulesConfig.AddRule(sc.dropRule(macChain.Name))
 
-	rulestore, err := sc.configurer.Apply(rulesConfig)
-	if err != nil {
+	if err := sc.configurer.Apply(rulesConfig); 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, ifaceMatchRuleErr := sc.findPreroutingRule(&ruleToFindExcludingStatements)
-	if ifaceMatchRuleErr == nil && len(rules) > 0 {
+		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 {
+			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()
 	regularChainsConfig.DeleteChain(ifaceChain)
 	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)
 	}
 
@@ -218,10 +195,12 @@ 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}}},
 		},
@@ -229,7 +208,7 @@ func (sc *SpoofChecker) dropRule(chain string) *schema.Rule {
 	}
 }
 
-func (sc *SpoofChecker) baseChain() *schema.Chain {
+func (_ *SpoofChecker) baseChain() *schema.Chain {
 	chainPriority := -300
 	return &schema.Chain{
 		Family: schema.FamilyBridge,
@@ -251,7 +230,7 @@ func (sc *SpoofChecker) ifaceChain() *schema.Chain {
 	}
 }
 
-func (sc *SpoofChecker) macChain(ifaceChainName string) *schema.Chain {
+func (_ *SpoofChecker) macChain(ifaceChainName string) *schema.Chain {
 	macChainName := ifaceChainName + "-mac"
 	return &schema.Chain{
 		Family: schema.FamilyBridge,
@@ -264,7 +243,3 @@ 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

@@ -15,11 +15,10 @@
 package link_test
 
 import (
-	"errors"
 	"fmt"
-
 	"github.com/networkplumbing/go-nft/nft"
-	. "github.com/onsi/ginkgo/v2"
+
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 
 	"github.com/containernetworking/plugins/pkg/link"
@@ -114,32 +113,13 @@ 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",
@@ -153,14 +133,14 @@ 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",
@@ -177,7 +157,7 @@ func assertExpectedBaseChainRuleDeletionInTeardownConfig(action configurerStub)
 					"comment": "macspoofchk-container99-net1"
 				}}}
 			]}`
-	Expect(string(deleteBaseChainRuleJSONConfig)).To(MatchJSON(expectedDeleteIfaceMatchRuleJSONConfig))
+	Expect(string(deleteBaseChainRuleJsonConfig)).To(MatchJSON(expectedDeleteIfaceMatchRuleJsonConfig))
 }
 
 func rowConfigWithRulesOnly() string {
@@ -274,6 +254,7 @@ 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))
@@ -294,30 +275,23 @@ type configurerStub struct {
 	failFirstApplyConfig  bool
 	failSecondApplyConfig bool
 	failReadConfig        bool
-
-	applyReturnNil bool
-	readCalled     bool
 }
 
-func (a *configurerStub) Apply(c *nft.Config) (*nft.Config, error) {
+func (a *configurerStub) Apply(c *nft.Config) error {
 	a.applyCounter++
 	if a.failFirstApplyConfig && a.applyCounter == 1 {
-		return nil, errors.New(errorFirstApplyText)
+		return fmt.Errorf(errorFirstApplyText)
 	}
 	if a.failSecondApplyConfig && a.applyCounter == 2 {
-		return nil, errors.New(errorSecondApplyText)
+		return fmt.Errorf(errorSecondApplyText)
 	}
 	a.applyConfig = append(a.applyConfig, c)
-	if a.applyReturnNil {
-		return nil, nil
-	}
-	return c, nil
+	return nil
 }
 
-func (a *configurerStub) Read(_ ...string) (*nft.Config, error) {
-	a.readCalled = true
+func (a *configurerStub) Read() (*nft.Config, error) {
 	if a.failReadConfig {
-		return nil, errors.New(errorReadText)
+		return nil, fmt.Errorf(errorReadText)
 	}
 	return a.readConfig, nil
 }

pkg/ns/README.md

@@ -13,10 +13,10 @@ The `ns.Do()` method provides **partial** control over network namespaces for yo
 
 ```go
 err = targetNs.Do(func(hostNs ns.NetNS) error {
-	linkAttrs := netlink.NewLinkAttrs()
-	linkAttrs.Name = "dummy0"
 	dummy := &netlink.Dummy{
-		LinkAttrs: linkAttrs,
+		LinkAttrs: netlink.LinkAttrs{
+			Name: "dummy0",
+		},
 	}
 	return netlink.LinkAdd(dummy)
 })

pkg/ns/ns_linux.go

@@ -31,10 +31,6 @@ func GetCurrentNS() (NetNS, error) {
 	// return an unexpected network namespace.
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
-	return getCurrentNSNoLock()
-}
-
-func getCurrentNSNoLock() (NetNS, error) {
 	return GetNS(getCurrentThreadNetNSPath())
 }
 
@@ -156,54 +152,6 @@ func GetNS(nspath string) (NetNS, error) {
 	return &netNS{file: fd}, nil
 }
 
-// Returns a new empty NetNS.
-// Calling Close() let the kernel garbage collect the network namespace.
-func TempNetNS() (NetNS, error) {
-	var tempNS NetNS
-	var err error
-	var wg sync.WaitGroup
-	wg.Add(1)
-
-	// Create the new namespace in a new goroutine so that if we later fail
-	// to switch the namespace back to the original one, we can safely
-	// leave the thread locked to die without a risk of the current thread
-	// left lingering with incorrect namespace.
-	go func() {
-		defer wg.Done()
-		runtime.LockOSThread()
-
-		var threadNS NetNS
-		// save a handle to current network namespace
-		threadNS, err = getCurrentNSNoLock()
-		if err != nil {
-			err = fmt.Errorf("failed to open current namespace: %v", err)
-			return
-		}
-		defer threadNS.Close()
-
-		// create the temporary network namespace
-		err = unix.Unshare(unix.CLONE_NEWNET)
-		if err != nil {
-			return
-		}
-
-		// get a handle to the temporary network namespace
-		tempNS, err = getCurrentNSNoLock()
-
-		err2 := threadNS.Set()
-		if err2 == nil {
-			// Unlock the current thread only when we successfully switched back
-			// to the original namespace; otherwise leave the thread locked which
-			// will force the runtime to scrap the current thread, that is maybe
-			// not as optimal but at least always safe to do.
-			runtime.UnlockOSThread()
-		}
-	}()
-
-	wg.Wait()
-	return tempNS, err
-}
-
 func (ns *netNS) Path() string {
 	return ns.file.Name()
 }
@@ -225,7 +173,7 @@ func (ns *netNS) Do(toRun func(NetNS) error) error {
 	}
 
 	containedCall := func(hostNS NetNS) error {
-		threadNS, err := getCurrentNSNoLock()
+		threadNS, err := GetCurrentNS()
 		if err != nil {
 			return fmt.Errorf("failed to open current netns: %v", err)
 		}

pkg/ns/ns_linux_test.go

@@ -17,16 +17,16 @@ package ns_test
 import (
 	"errors"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"path/filepath"
 	"sync"
 
-	. "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"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"golang.org/x/sys/unix"
 )
 
 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(uint64(0)))
+				Expect(testNsInode).NotTo(Equal(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 := os.CreateTemp("", "nstest")
+				tempFile, err := ioutil.TempFile("", "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 := os.CreateTemp("", "nstest")
+			tempFile, err := ioutil.TempFile("", "nstest")
 			Expect(err).NotTo(HaveOccurred())
 			defer tempFile.Close()
 

pkg/ns/ns_suite_test.go

@@ -15,14 +15,18 @@
 package ns_test
 
 import (
+	"math/rand"
 	"runtime"
-	"testing"
 
-	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/ginkgo"
+	"github.com/onsi/ginkgo/config"
 	. "github.com/onsi/gomega"
+
+	"testing"
 )
 
 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(_ []byte) (int, error) {
+func (r *BadReader) Read(buffer []byte) (int, error) {
 	if r.Error != nil {
 		return 0, r.Error
 	}

pkg/testutils/cmd.go

@@ -15,7 +15,7 @@
 package testutils
 
 import (
-	"io"
+	"io/ioutil"
 	"os"
 
 	"github.com/containernetworking/cni/pkg/skel"
@@ -29,7 +29,6 @@ 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) {
@@ -38,7 +37,6 @@ 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
@@ -54,7 +52,7 @@ func CmdAdd(cniNetns, cniContainerID, cniIfname string, conf []byte, f func() er
 
 	var out []byte
 	if err == nil {
-		out, err = io.ReadAll(r)
+		out, err = ioutil.ReadAll(r)
 	}
 	os.Stdout = oldStdout
 
@@ -83,20 +81,19 @@ 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, f func() error) error {
+func CmdCheck(cniNetns, cniContainerID, cniIfname string, conf []byte, 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, f)
+	return CmdCheck(args.Netns, args.ContainerID, args.IfName, args.StdinData, f)
 }
 
 func CmdDel(cniNetns, cniContainerID, cniIfname string, f func() error) error {
@@ -105,7 +102,6 @@ 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()
@@ -114,12 +110,3 @@ func CmdDel(cniNetns, cniContainerID, cniIfname string, f func() error) error {
 func CmdDelWithArgs(args *skel.CmdArgs, f func() error) error {
 	return CmdDel(args.Netns, args.ContainerID, args.IfName, f)
 }
-
-func CmdStatus(f func() error) error {
-	os.Setenv("CNI_COMMAND", "STATUS")
-	os.Setenv("CNI_PATH", os.Getenv("PATH"))
-	os.Setenv("CNI_NETNS_OVERRIDE", "1")
-	defer envCleanup()
-
-	return f()
-}

pkg/testutils/dns.go

@@ -16,6 +16,7 @@ package testutils
 
 import (
 	"fmt"
+	"io/ioutil"
 	"os"
 	"strings"
 
@@ -27,7 +28,7 @@ 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 := os.CreateTemp("", "cni_test_resolv.conf")
+	f, err := ioutil.TempFile("", "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"
+	"io/ioutil"
 	"net"
 	"os/exec"
 	"strings"
 
-	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/ginkgo"
 	. "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(io.ReadAll(conn)).To(Equal([]byte("hello")))
+			Expect(ioutil.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", serverAddress)
+			fmt.Println("Server address", string(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 (
-	"testing"
-
-	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+
+	"testing"
 )
 
 func TestEchosvr(t *testing.T) {

pkg/testutils/echo/server/main.go

@@ -1,7 +1,6 @@
 // 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.
@@ -44,13 +43,11 @@ func main() {
 	// Start UDP server
 	addr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%s", port))
 	if err != nil {
-		log.Printf("Error from net.ResolveUDPAddr(): %s", err)
-		return
+		log.Fatalf("Error from net.ResolveUDPAddr(): %s", err)
 	}
 	sock, err := net.ListenUDP("udp", addr)
 	if err != nil {
-		log.Printf("Error from ListenUDP(): %s", err)
-		return
+		log.Fatalf("Error from ListenUDP(): %s", err)
 	}
 	defer sock.Close()
 
@@ -58,11 +55,10 @@ func main() {
 	for {
 		n, addr, err := sock.ReadFrom(buffer)
 		if err != nil {
-			log.Printf("Error from ReadFrom(): %s", err)
-			return
+			log.Fatalf("Error from ReadFrom(): %s", err)
 		}
 		sock.SetWriteDeadline(time.Now().Add(1 * time.Minute))
-		_, err = sock.WriteTo(buffer[0:n], addr)
+		n, err = sock.WriteTo(buffer[0:n], addr)
 		if err != nil {
 			return
 		}

pkg/testutils/netns_linux.go

@@ -24,9 +24,8 @@ import (
 	"sync"
 	"syscall"
 
-	"golang.org/x/sys/unix"
-
 	"github.com/containernetworking/plugins/pkg/ns"
+	"golang.org/x/sys/unix"
 )
 
 func getNsRunDir() string {
@@ -50,6 +49,7 @@ 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, 0o755)
+	err = os.MkdirAll(nsRunDir, 0755)
 	if err != nil {
 		return nil, err
 	}

pkg/testutils/testing.go

@@ -19,7 +19,7 @@ import (
 )
 
 // AllSpecVersions contains all CNI spec version numbers
-var AllSpecVersions = [...]string{"0.1.0", "0.2.0", "0.3.0", "0.3.1", "0.4.0", "1.0.0", "1.1.0"}
+var AllSpecVersions = [...]string{"0.1.0", "0.2.0", "0.3.0", "0.3.1", "0.4.0", "1.0.0"}
 
 // SpecVersionHasIPVersion returns true if the given CNI specification version
 // includes the "version" field in the IP address elements
@@ -39,13 +39,6 @@ func SpecVersionHasCHECK(ver string) bool {
 	return ok
 }
 
-// SpecVersionHasSTATUS returns true if the given CNI specification version
-// supports the STATUS command
-func SpecVersionHasSTATUS(ver string) bool {
-	ok, _ := version.GreaterThanOrEqualTo(ver, "1.1.0")
-	return ok
-}
-
 // SpecVersionHasChaining returns true if the given CNI specification version
 // supports plugin chaining
 func SpecVersionHasChaining(ver string) bool {

pkg/utils/conntrack.go

@@ -51,7 +51,7 @@ func DeleteConntrackEntriesForDstIP(dstIP string, protocol uint8) error {
 	filter.AddIP(netlink.ConntrackOrigDstIP, ip)
 	filter.AddProtocol(protocol)
 
-	_, err := netlink.ConntrackDeleteFilters(netlink.ConntrackTable, family, filter)
+	_, err := netlink.ConntrackDeleteFilter(netlink.ConntrackTable, family, filter)
 	if err != nil {
 		return fmt.Errorf("error deleting connection tracking state for protocol: %d IP: %s, error: %v", protocol, ip, err)
 	}
@@ -65,7 +65,7 @@ func DeleteConntrackEntriesForDstPort(port uint16, protocol uint8, family netlin
 	filter.AddProtocol(protocol)
 	filter.AddPort(netlink.ConntrackOrigDstPort, port)
 
-	_, err := netlink.ConntrackDeleteFilters(netlink.ConntrackTable, family, filter)
+	_, err := netlink.ConntrackDeleteFilter(netlink.ConntrackTable, family, filter)
 	if err != nil {
 		return fmt.Errorf("error deleting connection tracking state for protocol: %d Port: %d, error: %v", protocol, port, 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 := ipt.ChainExists(table, chain)
+	exists, err := ChainExists(ipt, table, chain)
 	if err != nil {
-		return fmt.Errorf("failed to check iptables chain existence: %v", err)
+		return fmt.Errorf("failed to list iptables chains: %v", err)
 	}
 	if !exists {
 		err = ipt.NewChain(table, chain)
@@ -45,6 +45,24 @@ 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 {
@@ -115,6 +133,7 @@ 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...)
 	}
+}

pkg/utils/iptables_test.go

@@ -19,12 +19,11 @@ 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
@@ -35,6 +34,7 @@ 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()
@@ -60,6 +60,7 @@ var _ = Describe("chain tests", func() {
 			ipt.DeleteChain(TABLE, testChain)
 			currNs.Set()
 		}
+
 	})
 
 	AfterEach(func() {
@@ -92,4 +93,5 @@ var _ = Describe("chain tests", func() {
 			Expect(err).NotTo(HaveOccurred())
 		})
 	})
+
 })

pkg/utils/netfilter.go

@@ -1,46 +0,0 @@
-// Copyright 2023 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 utils
-
-import (
-	"github.com/coreos/go-iptables/iptables"
-	"sigs.k8s.io/knftables"
-)
-
-// SupportsIPTables tests whether the system supports using netfilter via the iptables API
-// (whether via "iptables-legacy" or "iptables-nft"). (Note that this returns true if it
-// is *possible* to use iptables; it does not test whether any other components on the
-// system are *actually* using iptables.)
-func SupportsIPTables() bool {
-	ipt, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
-	if err != nil {
-		return false
-	}
-	// We don't care whether the chain actually exists, only whether we can *check*
-	// whether it exists.
-	_, err = ipt.ChainExists("filter", "INPUT")
-	return err == nil
-}
-
-// SupportsNFTables tests whether the system supports using netfilter via the nftables API
-// (ie, not via "iptables-nft"). (Note that this returns true if it is *possible* to use
-// nftables; it does not test whether any other components on the system are *actually*
-// using nftables.)
-func SupportsNFTables() bool {
-	// knftables.New() does sanity checks so we don't need any further test like in
-	// the iptables case.
-	_, err := knftables.New(knftables.IPv4Family, "supports_nftables_test")
-	return err == nil
-}

pkg/utils/netfilter_test.go

@@ -1,52 +0,0 @@
-// Copyright 2023 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 utils
-
-import (
-	"os"
-
-	. "github.com/onsi/ginkgo/v2"
-	. "github.com/onsi/gomega"
-)
-
-var _ = Describe("netfilter support", func() {
-	When("it is available", func() {
-		It("reports that iptables is supported", func() {
-			Expect(SupportsIPTables()).To(BeTrue(), "This test should only fail if iptables is not available, but the test suite as a whole requires it to be available.")
-		})
-		It("reports that nftables is supported", func() {
-			Expect(SupportsNFTables()).To(BeTrue(), "This test should only fail if nftables is not available, but the test suite as a whole requires it to be available.")
-		})
-	})
-
-	// These are Serial because os.Setenv has process-wide effect
-	When("it is not available", Serial, func() {
-		var origPath string
-		BeforeEach(func() {
-			origPath = os.Getenv("PATH")
-			os.Setenv("PATH", "/does-not-exist")
-		})
-		AfterEach(func() {
-			os.Setenv("PATH", origPath)
-		})
-
-		It("reports that iptables is not supported", func() {
-			Expect(SupportsIPTables()).To(BeFalse(), "found iptables outside of PATH??")
-		})
-		It("reports that nftables is not supported", func() {
-			Expect(SupportsNFTables()).To(BeFalse(), "found nftables outside of PATH??")
-		})
-	})
-})

pkg/utils/sysctl/sysctl_linux.go

@@ -16,7 +16,7 @@ package sysctl
 
 import (
 	"fmt"
-	"os"
+	"io/ioutil"
 	"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 := os.ReadFile(fullName)
+	data, err := ioutil.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 := os.WriteFile(fullName, []byte(value), 0o644); err != nil {
+	if err := ioutil.WriteFile(fullName, []byte(value), 0644); err != nil {
 		return "", err
 	}
 

pkg/utils/sysctl/sysctl_linux_test.go

@@ -20,13 +20,12 @@ 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 (
@@ -38,7 +37,8 @@ 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()
@@ -48,11 +48,11 @@ var _ = Describe("Sysctl tests", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		testIfaceName = fmt.Sprintf("cnitest.%d", rand.Intn(100000))
-		testLinkAttrs := netlink.NewLinkAttrs()
-		testLinkAttrs.Name = testIfaceName
-		testLinkAttrs.Namespace = netlink.NsFd(int(testNs.Fd()))
 		testIface := &netlink.Dummy{
-			LinkAttrs: testLinkAttrs,
+			LinkAttrs: netlink.LinkAttrs{
+				Name:      testIfaceName,
+				Namespace: netlink.NsFd(int(testNs.Fd())),
+			},
 		}
 
 		err = netlink.LinkAdd(testIface)
@@ -66,7 +66,8 @@ var _ = Describe("Sysctl tests", func() {
 			netlink.LinkDel(testIface)
 			currNs.Set()
 		}
-	}
+
+	})
 
 	AfterEach(func() {
 		cleanup()
@@ -74,8 +75,7 @@ var _ = Describe("Sysctl tests", func() {
 
 	Describe("Sysctl", func() {
 		It("reads keys with dot separators", func() {
-			beforeEach()
-			sysctlIfaceName := strings.ReplaceAll(testIfaceName, ".", "/")
+			sysctlIfaceName := strings.Replace(testIfaceName, ".", "/", -1)
 			sysctlKey := fmt.Sprintf(sysctlDotKeyTemplate, sysctlIfaceName)
 
 			_, err := sysctl.Sysctl(sysctlKey)
@@ -85,7 +85,6 @@ 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)
@@ -95,8 +94,7 @@ var _ = Describe("Sysctl tests", func() {
 
 	Describe("Sysctl", func() {
 		It("writes keys with dot separators", func() {
-			beforeEach()
-			sysctlIfaceName := strings.ReplaceAll(testIfaceName, ".", "/")
+			sysctlIfaceName := strings.Replace(testIfaceName, ".", "/", -1)
 			sysctlKey := fmt.Sprintf(sysctlDotKeyTemplate, sysctlIfaceName)
 
 			_, err := sysctl.Sysctl(sysctlKey, "1")
@@ -106,11 +104,11 @@ 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/v2"
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
 

pkg/utils/utils_suite_test.go

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

pkg/utils/utils_test.go

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

plugins/ipam/dhcp/client.go

@@ -0,0 +1,135 @@
+// Copyright 2021 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 main
+
+import (
+	"github.com/d2g/dhcp4"
+	"github.com/d2g/dhcp4client"
+)
+
+const (
+	MaxDHCPLen = 576
+)
+
+//Send the Discovery Packet to the Broadcast Channel
+func DhcpSendDiscoverPacket(c *dhcp4client.Client, options dhcp4.Options) (dhcp4.Packet, error) {
+	discoveryPacket := c.DiscoverPacket()
+
+	for opt, data := range options {
+		discoveryPacket.AddOption(opt, data)
+	}
+
+	discoveryPacket.PadToMinSize()
+	return discoveryPacket, c.SendPacket(discoveryPacket)
+}
+
+//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)
+
+	for opt, data := range options {
+		requestPacket.AddOption(opt, data)
+	}
+
+	requestPacket.PadToMinSize()
+
+	return requestPacket, c.SendPacket(requestPacket)
+}
+
+//Send Decline to the received acknowledgement.
+func DhcpSendDecline(c *dhcp4client.Client, acknowledgementPacket *dhcp4.Packet, options dhcp4.Options) (dhcp4.Packet, error) {
+	declinePacket := c.DeclinePacket(acknowledgementPacket)
+
+	for opt, data := range options {
+		declinePacket.AddOption(opt, data)
+	}
+
+	declinePacket.PadToMinSize()
+
+	return declinePacket, c.SendPacket(declinePacket)
+}
+
+//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 {
+		return false, discoveryPacket, err
+	}
+
+	offerPacket, err := c.GetOffer(&discoveryPacket)
+	if err != nil {
+		return false, offerPacket, err
+	}
+
+	requestPacket, err := DhcpSendRequest(c, options, &offerPacket)
+	if err != nil {
+		return false, requestPacket, err
+	}
+
+	acknowledgement, err := c.GetAcknowledgement(&requestPacket)
+	if err != nil {
+		return false, acknowledgement, err
+	}
+
+	acknowledgementOptions := acknowledgement.ParseOptions()
+	if dhcp4.MessageType(acknowledgementOptions[dhcp4.OptionDHCPMessageType][0]) != dhcp4.ACK {
+		return false, acknowledgement, nil
+	}
+
+	return true, acknowledgement, nil
+}
+
+//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)
+
+	for opt, data := range options {
+		renewRequest.AddOption(opt, data)
+	}
+
+	renewRequest.PadToMinSize()
+
+	err := c.SendPacket(renewRequest)
+	if err != nil {
+		return false, renewRequest, err
+	}
+
+	newAcknowledgement, err := c.GetAcknowledgement(&renewRequest)
+	if err != nil {
+		return false, newAcknowledgement, err
+	}
+
+	newAcknowledgementOptions := newAcknowledgement.ParseOptions()
+	if dhcp4.MessageType(newAcknowledgementOptions[dhcp4.OptionDHCPMessageType][0]) != dhcp4.ACK {
+		return false, newAcknowledgement, nil
+	}
+
+	return true, newAcknowledgement, nil
+}
+
+//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)
+
+	for opt, data := range options {
+		release.AddOption(opt, data)
+	}
+
+	release.PadToMinSize()
+
+	return c.SendPacket(release)
+}

plugins/ipam/dhcp/daemon.go

@@ -15,25 +15,22 @@
 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")
@@ -44,21 +41,19 @@ type DHCP struct {
 	hostNetnsPrefix string
 	clientTimeout   time.Duration
 	clientResendMax time.Duration
-	clientResendTimeout time.Duration
 	broadcast       bool
 }
 
-func newDHCP(clientTimeout, clientResendMax time.Duration, resendTimeout time.Duration) *DHCP {
+func newDHCP(clientTimeout, clientResendMax time.Duration) *DHCP {
 	return &DHCP{
 		leases:          make(map[string]*DHCPLease),
 		clientTimeout:   clientTimeout,
 		clientResendMax: clientResendMax,
-		clientResendTimeout: resendTimeout,
 	}
 }
 
 // TODO: current client ID is too long. At least the container ID should not be used directly.
-// A separate issue is necessary to ensure no breaking change is affecting other users.
+// A seperate 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.
@@ -76,27 +71,19 @@ func (d *DHCP) Allocate(args *skel.CmdArgs, result *current.Result) error {
 		return fmt.Errorf("error parsing netconf: %v", err)
 	}
 
-	opts, err := prepareOptions(args.Args, conf.IPAM.ProvideOptions, conf.IPAM.RequestOptions)
+	optsRequesting, optsProviding, err := prepareOptions(args.Args, conf.IPAM.ProvideOptions, conf.IPAM.RequestOptions)
 	if err != nil {
 		return err
 	}
 
 	clientID := generateClientID(args.ContainerID, conf.Name, args.IfName)
-
-	// 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,
-			opts,
-			d.clientTimeout, d.clientResendMax, d.clientResendTimeout, d.broadcast)
+	l, err := AcquireLease(clientID, hostNetns, args.IfName,
+		optsRequesting, optsProviding,
+		d.clientTimeout, d.clientResendMax, d.broadcast)
 	if err != nil {
 		return err
 	}
-	}
 
 	ipn, err := l.IPNet()
 	if err != nil {
@@ -111,18 +98,13 @@ func (d *DHCP) Allocate(args *skel.CmdArgs, result *current.Result) error {
 		Gateway: l.Gateway(),
 	}}
 	result.Routes = l.Routes()
-	if conf.IPAM.Priority != 0 {
-		for _, r := range result.Routes {
-			r.Priority = conf.IPAM.Priority
-		}
-	}
 
 	return nil
 }
 
 // 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, _ *struct{}) error {
+func (d *DHCP) Release(args *skel.CmdArgs, reply *struct{}) error {
 	conf := NetConf{}
 	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
 		return fmt.Errorf("error parsing netconf: %v", err)
@@ -174,7 +156,7 @@ func getListener(socketPath string) (net.Listener, error) {
 
 	switch {
 	case len(l) == 0:
-		if err := os.MkdirAll(filepath.Dir(socketPath), 0o700); err != nil {
+		if err := os.MkdirAll(filepath.Dir(socketPath), 0700); err != nil {
 			return nil, err
 		}
 		return net.Listen("unix", socketPath)
@@ -192,8 +174,7 @@ func getListener(socketPath string) (net.Listener, error) {
 
 func runDaemon(
 	pidfilePath, hostPrefix, socketPath string,
-	dhcpClientTimeout time.Duration, resendMax time.Duration, resendTimeout time.Duration,
-	broadcast bool,
+	dhcpClientTimeout time.Duration, resendMax time.Duration, broadcast bool,
 ) error {
 	// since other goroutines (on separate threads) will change namespaces,
 	// ensure the RPC server does not get scheduled onto those
@@ -204,7 +185,7 @@ func runDaemon(
 		if !filepath.IsAbs(pidfilePath) {
 			return fmt.Errorf("Error writing pidfile %q: path not absolute", pidfilePath)
 		}
-		if err := os.WriteFile(pidfilePath, []byte(fmt.Sprintf("%d", os.Getpid())), 0o644); err != nil {
+		if err := ioutil.WriteFile(pidfilePath, []byte(fmt.Sprintf("%d", os.Getpid())), 0644); err != nil {
 			return fmt.Errorf("Error writing pidfile %q: %v", pidfilePath, err)
 		}
 	}
@@ -214,27 +195,11 @@ 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, resendTimeout)
+	dhcp := newDHCP(dhcpClientTimeout, resendMax)
 	dhcp.hostNetnsPrefix = hostPrefix
 	dhcp.broadcast = broadcast
 	rpc.Register(dhcp)
 	rpc.HandleHTTP()
-	srv.Serve(l)
-
-	<-done
+	http.Serve(l, nil)
 	return nil
 }

plugins/ipam/dhcp/dhcp2_test.go

@@ -16,19 +16,21 @@ 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() {
@@ -38,10 +40,11 @@ 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, socketPath, originalNS, targetNS, err = dhcpSetupOriginalNS()
+		dhcpServerStopCh, serverIP, socketPath, originalNS, targetNS, err = dhcpSetupOriginalNS()
 		Expect(err).NotTo(HaveOccurred())
 
 		// Move the container side to the container's NS
@@ -61,12 +64,13 @@ var _ = Describe("DHCP Multiple Lease Operations", func() {
 		})
 
 		// Start the DHCP server
-		dhcpServerDone = dhcpServerStart(originalNS, 2, dhcpServerStopCh)
+		dhcpServerDone, err = dhcpServerStart(originalNS, net.IPv4(192, 168, 1, 5), serverIP.IP, 2, dhcpServerStopCh)
+		Expect(err).NotTo(HaveOccurred())
 
 		// Start the DHCP client daemon
 		dhcpPluginPath, err := exec.LookPath("dhcp")
 		Expect(err).NotTo(HaveOccurred())
-		clientCmd = exec.Command(dhcpPluginPath, "daemon", "-socketpath", socketPath, "--timeout", "2s", "--resendtimeout", "8s")
+		clientCmd = exec.Command(dhcpPluginPath, "daemon", "-socketpath", socketPath)
 		err = clientCmd.Start()
 		Expect(err).NotTo(HaveOccurred())
 		Expect(clientCmd.Process).NotTo(BeNil())
@@ -119,7 +123,7 @@ var _ = Describe("DHCP Multiple Lease Operations", func() {
 
 			addResult, err = current.GetResult(r)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(addResult.IPs).To(HaveLen(1))
+			Expect(len(addResult.IPs)).To(Equal(1))
 			Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
 			return nil
 		})
@@ -142,7 +146,7 @@ var _ = Describe("DHCP Multiple Lease Operations", func() {
 
 			addResult, err = current.GetResult(r)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(addResult.IPs).To(HaveLen(1))
+			Expect(len(addResult.IPs)).To(Equal(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 (
-	"testing"
-
-	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+
+	"testing"
 )
 
 func TestDHCP(t *testing.T) {

plugins/ipam/dhcp/dhcp_test.go

@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net"
 	"os"
 	"os/exec"
@@ -25,18 +26,24 @@ import (
 	"sync"
 	"time"
 
-	. "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/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/gomega"
 )
 
 func getTmpDir() (string, error) {
-	tmpDir, err := os.MkdirTemp(cniDirPrefix, "dhcp")
+	tmpDir, err := ioutil.TempDir(cniDirPrefix, "dhcp")
 	if err == nil {
 		tmpDir = filepath.ToSlash(tmpDir)
 	}
@@ -44,52 +51,31 @@ func getTmpDir() (string, error) {
 	return tmpDir, err
 }
 
-type DhcpServer struct {
-	cmd  *exec.Cmd
-	lock sync.Mutex
+func dhcpServerStart(netns ns.NetNS, leaseIP, serverIP net.IP, numLeases int, stopCh <-chan bool) (*sync.WaitGroup, error) {
+	// Add the expected IP to the pool
+	lp := memorypool.MemoryPool{}
 
-	startAddr net.IP
-	endAddr   net.IP
-	leaseTime time.Duration
+	Expect(numLeases).To(BeNumerically(">", 0))
+	// Currently tests only need at most 2
+	Expect(numLeases).To(BeNumerically("<=", 2))
+
+	// tests expect first lease to be at address 192.168.1.5
+	for i := 5; i < numLeases+5; i++ {
+		err := lp.AddLease(leasepool.Lease{IP: dhcp4.IPAdd(net.IPv4(192, 168, 1, byte(i)), 0)})
+		if err != nil {
+			return nil, fmt.Errorf("error adding IP to DHCP pool: %v", err)
+		}
 	}
 
-func (s *DhcpServer) Serve() error {
-	if err := s.Start(); err != nil {
-		return err
-	}
-	return s.cmd.Wait()
-}
-
-func (s *DhcpServer) Start() error {
-	s.lock.Lock()
-	defer s.lock.Unlock()
-
-	s.cmd = exec.Command(
-		"dnsmasq",
-		"--no-daemon",
-		"--dhcp-sequential-ip", // allocate IPs sequentially
-		"--port=0",             // disable DNS
-		"--conf-file=-",        // Do not read /etc/dnsmasq.conf
-		fmt.Sprintf("--dhcp-range=%s,%s,%d", s.startAddr, s.endAddr, int(s.leaseTime.Seconds())),
+	dhcpServer, err := dhcp4server.New(
+		net.IPv4(192, 168, 1, 1),
+		&lp,
+		dhcp4server.SetLocalAddr(net.UDPAddr{IP: net.IPv4(0, 0, 0, 0), Port: 67}),
+		dhcp4server.SetRemoteAddr(net.UDPAddr{IP: net.IPv4bcast, Port: 68}),
+		dhcp4server.LeaseDuration(time.Minute*15),
 	)
-	s.cmd.Stdin = bytes.NewBufferString("")
-	s.cmd.Stdout = os.Stdout
-	s.cmd.Stderr = os.Stderr
-
-	return s.cmd.Start()
-}
-
-func (s *DhcpServer) Stop() error {
-	s.lock.Lock()
-	defer s.lock.Unlock()
-	return s.cmd.Process.Kill()
-}
-
-func dhcpServerStart(netns ns.NetNS, numLeases int, stopCh <-chan bool) *sync.WaitGroup {
-	dhcpServer := &DhcpServer{
-		startAddr: net.IPv4(192, 168, 1, 5),
-		endAddr:   net.IPv4(192, 168, 1, 5+uint8(numLeases)-1),
-		leaseTime: 5 * time.Minute,
+	if err != nil {
+		return nil, fmt.Errorf("failed to create DHCP server: %v", err)
 	}
 
 	stopWg := sync.WaitGroup{}
@@ -101,10 +87,9 @@ func dhcpServerStart(netns ns.NetNS, numLeases int, stopCh <-chan bool) *sync.Wa
 	go func() {
 		defer GinkgoRecover()
 
-		err := netns.Do(func(ns.NetNS) error {
+		err = netns.Do(func(ns.NetNS) error {
 			startWg.Done()
-
-			if err := dhcpServer.Serve(); err != nil {
+			if err := dhcpServer.ListenAndServe(); err != nil {
 				// Log, but don't trap errors; the server will
 				// always report an error when stopped
 				GinkgoT().Logf("DHCP server finished with error: %v", err)
@@ -121,12 +106,12 @@ func dhcpServerStart(netns ns.NetNS, numLeases int, stopCh <-chan bool) *sync.Wa
 	go func() {
 		startWg.Done()
 		<-stopCh
-		dhcpServer.Stop()
+		dhcpServer.Shutdown()
 		stopWg.Done()
 	}()
 	startWg.Wait()
 
-	return &stopWg
+	return &stopWg, nil
 }
 
 const (
@@ -136,7 +121,7 @@ const (
 )
 
 var _ = BeforeSuite(func() {
-	err := os.MkdirAll(cniDirPrefix, 0o700)
+	err := os.MkdirAll(cniDirPrefix, 0700)
 	Expect(err).NotTo(HaveOccurred())
 })
 
@@ -173,10 +158,10 @@ var _ = Describe("DHCP Operations", func() {
 		err = originalNS.Do(func(ns.NetNS) error {
 			defer GinkgoRecover()
 
-			linkAttrs := netlink.NewLinkAttrs()
-			linkAttrs.Name = hostVethName
 			err = netlink.LinkAdd(&netlink.Veth{
-				LinkAttrs: linkAttrs,
+				LinkAttrs: netlink.LinkAttrs{
+					Name: hostVethName,
+				},
 				PeerName: contVethName,
 			})
 			Expect(err).NotTo(HaveOccurred())
@@ -218,7 +203,8 @@ var _ = Describe("DHCP Operations", func() {
 		})
 
 		// Start the DHCP server
-		dhcpServerDone = dhcpServerStart(originalNS, 1, dhcpServerStopCh)
+		dhcpServerDone, err = dhcpServerStart(originalNS, net.IPv4(192, 168, 1, 5), serverIP.IP, 1, dhcpServerStopCh)
+		Expect(err).NotTo(HaveOccurred())
 
 		// Start the DHCP client daemon
 		dhcpPluginPath, err := exec.LookPath("dhcp")
@@ -288,7 +274,7 @@ var _ = Describe("DHCP Operations", func() {
 
 				addResult, err = types100.GetResult(r)
 				Expect(err).NotTo(HaveOccurred())
-				Expect(addResult.IPs).To(HaveLen(1))
+				Expect(len(addResult.IPs)).To(Equal(1))
 				Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
 				return nil
 			})
@@ -331,7 +317,7 @@ var _ = Describe("DHCP Operations", func() {
 
 				addResult, err = types100.GetResult(r)
 				Expect(err).NotTo(HaveOccurred())
-				Expect(addResult.IPs).To(HaveLen(1))
+				Expect(len(addResult.IPs)).To(Equal(1))
 				Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
 				return nil
 			})
@@ -349,17 +335,9 @@ 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 {
-							copiedArgs := &skel.CmdArgs{
-								ContainerID: args.ContainerID,
-								Netns:       args.Netns,
-								IfName:      args.IfName,
-								StdinData:   args.StdinData,
-								Path:        args.Path,
-								Args:        args.Args,
-							}
-							return cmdDel(copiedArgs)
+							return cmdDel(args)
 						})
 					})
 					Expect(err).NotTo(HaveOccurred())
@@ -386,7 +364,7 @@ const (
 	contVethName1  string = "eth1"
 )
 
-func dhcpSetupOriginalNS() (chan bool, string, ns.NetNS, ns.NetNS, error) {
+func dhcpSetupOriginalNS() (chan bool, net.IPNet, string, ns.NetNS, ns.NetNS, error) {
 	var originalNS, targetNS ns.NetNS
 	var dhcpServerStopCh chan bool
 	var socketPath string
@@ -407,15 +385,20 @@ func dhcpSetupOriginalNS() (chan bool, string, ns.NetNS, ns.NetNS, error) {
 	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()
 
-		linkAttrs := netlink.NewLinkAttrs()
-		linkAttrs.Name = hostBridgeName
 		// Create bridge in the "host" (original) NS
 		br = &netlink.Bridge{
-			LinkAttrs: linkAttrs,
+			LinkAttrs: netlink.LinkAttrs{
+				Name: hostBridgeName,
+			},
 		}
 
 		err = netlink.LinkAdd(br)
@@ -501,7 +484,7 @@ func dhcpSetupOriginalNS() (chan bool, string, ns.NetNS, ns.NetNS, error) {
 		return nil
 	})
 
-	return dhcpServerStopCh, socketPath, originalNS, targetNS, err
+	return dhcpServerStopCh, serverIP, socketPath, originalNS, targetNS, err
 }
 
 var _ = Describe("DHCP Lease Unavailable Operations", func() {
@@ -511,10 +494,11 @@ 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, socketPath, originalNS, targetNS, err = dhcpSetupOriginalNS()
+		dhcpServerStopCh, serverIP, socketPath, originalNS, targetNS, err = dhcpSetupOriginalNS()
 		Expect(err).NotTo(HaveOccurred())
 
 		// Move the container side to the container's NS
@@ -534,7 +518,8 @@ var _ = Describe("DHCP Lease Unavailable Operations", func() {
 		})
 
 		// Start the DHCP server
-		dhcpServerDone = dhcpServerStart(originalNS, 1, dhcpServerStopCh)
+		dhcpServerDone, err = dhcpServerStart(originalNS, net.IPv4(192, 168, 1, 5), serverIP.IP, 1, dhcpServerStopCh)
+		Expect(err).NotTo(HaveOccurred())
 
 		// Start the DHCP client daemon
 		dhcpPluginPath, err := exec.LookPath("dhcp")
@@ -544,7 +529,7 @@ var _ = Describe("DHCP Lease Unavailable Operations", func() {
 		// `go test` timeout with default delays. Since our DHCP server
 		// and client daemon are local processes anyway, we can depend on
 		// them to respond very quickly.
-		clientCmd = exec.Command(dhcpPluginPath, "daemon", "-socketpath", socketPath, "-timeout", "2s", "-resendmax", "8s", "--resendtimeout", "10s")
+		clientCmd = exec.Command(dhcpPluginPath, "daemon", "-socketpath", socketPath, "-timeout", "2s", "-resendmax", "8s")
 
 		// copy dhcp client's stdout/stderr to test stdout
 		var b bytes.Buffer
@@ -612,7 +597,7 @@ var _ = Describe("DHCP Lease Unavailable Operations", func() {
 
 				addResult, err = types100.GetResult(r)
 				Expect(err).NotTo(HaveOccurred())
-				Expect(addResult.IPs).To(HaveLen(1))
+				Expect(len(addResult.IPs)).To(Equal(1))
 				Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
 				return nil
 			})

plugins/ipam/dhcp/lease.go

@@ -15,7 +15,6 @@
 package main
 
 import (
-	"context"
 	"fmt"
 	"log"
 	"math/rand"
@@ -25,8 +24,8 @@ import (
 	"sync/atomic"
 	"time"
 
-	dhcp4 "github.com/insomniacslk/dhcp/dhcpv4"
-	"github.com/insomniacslk/dhcp/dhcpv4/nclient4"
+	"github.com/d2g/dhcp4"
+	"github.com/d2g/dhcp4client"
 	"github.com/vishvananda/netlink"
 
 	"github.com/containernetworking/cni/pkg/types"
@@ -35,19 +34,13 @@ import (
 
 // RFC 2131 suggests using exponential backoff, starting with 4sec
 // and randomized to +/- 1sec
-const (
-	resendDelay0         = 4 * time.Second
-	resendDelayMax       = 62 * time.Second
-	defaultLeaseTime     = 60 * time.Minute
-	defaultResendTimeout = 208 * time.Second // fast resend + backoff resend
-)
+const resendDelay0 = 4 * time.Second
+const 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
-	resendFastMax   = 4
-)
+const resendFastDelay = 2 * time.Second
+const resendFastMax = 4
 
 const (
 	leaseStateBound = iota
@@ -63,36 +56,31 @@ const (
 
 type DHCPLease struct {
 	clientID      string
-	latestLease   *nclient4.Lease
+	ack           *dhcp4.Packet
+	opts          dhcp4.Options
 	link          netlink.Link
 	renewalTime   time.Time
 	rebindingTime time.Time
 	expireTime    time.Time
 	timeout       time.Duration
 	resendMax     time.Duration
-	resendTimeout time.Duration
 	broadcast     bool
 	stopping      uint32
 	stop          chan struct{}
-	check         chan struct{}
 	wg            sync.WaitGroup
-	cancelFunc    context.CancelFunc
-	ctx           context.Context
 	// list of requesting and providing options and if they are necessary / their value
-	opts []dhcp4.Option
+	optsRequesting map[dhcp4.OptionCode]bool
+	optsProviding  map[dhcp4.OptionCode][]byte
 }
 
-var requestOptionsDefault = []dhcp4.OptionCode{
-	dhcp4.OptionRouter,
-	dhcp4.OptionSubnetMask,
+var requestOptionsDefault = map[dhcp4.OptionCode]bool{
+	dhcp4.OptionRouter:     true,
+	dhcp4.OptionSubnetMask: true,
 }
 
-func prepareOptions(cniArgs string, provideOptions []ProvideOption, requestOptions []RequestOption) (
-	[]dhcp4.Option, error,
-) {
-	var opts []dhcp4.Option
+func prepareOptions(cniArgs string, ProvideOptions []ProvideOption, RequestOptions []RequestOption) (
+	optsRequesting map[dhcp4.OptionCode]bool, optsProviding map[dhcp4.OptionCode][]byte, err error) {
 
-	var err error
 	// parse CNI args
 	cniArgsParsed := map[string]string{}
 	for _, argPair := range strings.Split(cniArgs, ";") {
@@ -104,51 +92,50 @@ func prepareOptions(cniArgs string, provideOptions []ProvideOption, requestOptio
 
 	// parse providing options map
 	var optParsed dhcp4.OptionCode
-	for _, opt := range provideOptions {
+	optsProviding = make(map[dhcp4.OptionCode][]byte)
+	for _, opt := range ProvideOptions {
 		optParsed, err = parseOptionName(string(opt.Option))
 		if err != nil {
-			return nil, fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
+			err = fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
+			return
 		}
 		if len(opt.Value) > 0 {
 			if len(opt.Value) > 255 {
-				return nil, fmt.Errorf("value too long for option %q: %q", opt.Option, opt.Value)
+				err = fmt.Errorf("value too long for option %q: %q", opt.Option, opt.Value)
+				return
 			}
-			opts = append(opts, dhcp4.Option{Code: optParsed, Value: dhcp4.String(opt.Value)})
+			optsProviding[optParsed] = []byte(opt.Value)
 		}
 		if value, ok := cniArgsParsed[opt.ValueFromCNIArg]; ok {
 			if len(value) > 255 {
-				return nil, fmt.Errorf("value too long for option %q from CNI_ARGS %q: %q", opt.Option, opt.ValueFromCNIArg, opt.Value)
+				err = fmt.Errorf("value too long for option %q from CNI_ARGS %q: %q", opt.Option, opt.ValueFromCNIArg, opt.Value)
+				return
 			}
-			opts = append(opts, dhcp4.Option{Code: optParsed, Value: dhcp4.String(value)})
+			optsProviding[optParsed] = []byte(value)
 		}
 	}
 
 	// parse necessary options map
-	var optsRequesting dhcp4.OptionCodeList
+	optsRequesting = make(map[dhcp4.OptionCode]bool)
 	skipRequireDefault := false
-	for _, opt := range requestOptions {
+	for _, opt := range RequestOptions {
 		if opt.SkipDefault {
 			skipRequireDefault = true
 		}
-		if opt.Option == "" {
-			continue
-		}
 		optParsed, err = parseOptionName(string(opt.Option))
 		if err != nil {
-			return nil, fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
+			err = fmt.Errorf("Can not parse option %q: %w", opt.Option, err)
+			return
 		}
-		optsRequesting.Add(optParsed)
+		optsRequesting[optParsed] = true
 	}
-	if !skipRequireDefault {
-		for _, opt := range requestOptionsDefault {
-			optsRequesting.Add(opt)
+	for k, v := range requestOptionsDefault {
+		// only set if not skipping default and this value does not exists
+		if _, ok := optsRequesting[k]; !ok && !skipRequireDefault {
+			optsRequesting[k] = v
 		}
 	}
-	if len(optsRequesting) > 0 {
-		opts = append(opts, dhcp4.Option{Code: dhcp4.OptionParameterRequestList, Value: optsRequesting})
-	}
-
-	return opts, err
+	return
 }
 
 // AcquireLease gets an DHCP lease and then maintains it in the background
@@ -156,25 +143,18 @@ func prepareOptions(cniArgs string, provideOptions []ProvideOption, requestOptio
 // calling DHCPLease.Stop()
 func AcquireLease(
 	clientID, netns, ifName string,
-	opts []dhcp4.Option,
-	timeout, resendMax time.Duration, resendTimeout time.Duration, broadcast bool,
+	optsRequesting map[dhcp4.OptionCode]bool, optsProviding map[dhcp4.OptionCode][]byte,
+	timeout, resendMax time.Duration, broadcast bool,
 ) (*DHCPLease, error) {
 	errCh := make(chan error, 1)
-
-	ctx := context.Background()
-	ctx, cancel := context.WithCancel(ctx)
-
 	l := &DHCPLease{
 		clientID:       clientID,
 		stop:           make(chan struct{}),
-		check:         make(chan struct{}),
 		timeout:        timeout,
 		resendMax:      resendMax,
-		resendTimeout: resendTimeout,
 		broadcast:      broadcast,
-		opts:          opts,
-		cancelFunc:    cancel,
-		ctx:           ctx,
+		optsRequesting: optsRequesting,
+		optsProviding:  optsProviding,
 	}
 
 	log.Printf("%v: acquiring lease", clientID)
@@ -216,74 +196,96 @@ func AcquireLease(
 func (l *DHCPLease) Stop() {
 	if atomic.CompareAndSwapUint32(&l.stopping, 0, 1) {
 		close(l.stop)
-		l.cancelFunc()
 	}
 	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 withClientID(clientID string) dhcp4.Modifier {
-	return func(d *dhcp4.DHCPv4) {
-		optClientID := []byte{0}
-		optClientID = append(optClientID, []byte(clientID)...)
-		d.Options.Update(dhcp4.OptClientIdentifier(optClientID))
-	}
+func (l *DHCPLease) getAllOptions() dhcp4.Options {
+	opts := l.getOptionsWithClientId()
+
+	for k, v := range l.optsProviding {
+		opts[k] = v
 	}
 
-func withAllOptions(l *DHCPLease) dhcp4.Modifier {
-	return func(d *dhcp4.DHCPv4) {
-		for _, opt := range l.opts {
-			d.Options.Update(opt)
-		}
+	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 {
-	if (l.link.Attrs().Flags & net.FlagUp) != net.FlagUp {
-		log.Printf("Link %q down. Attempting to set up", l.link.Attrs().Name)
-		if err := netlink.LinkSetUp(l.link); err != nil {
-			return err
-		}
-	}
-
-	c, err := newDHCPClient(l.link, l.timeout)
+	c, err := newDHCPClient(l.link, l.clientID, l.timeout, l.broadcast)
 	if err != nil {
 		return err
 	}
 	defer c.Close()
 
-	timeoutCtx, cancel := context.WithTimeoutCause(l.ctx, l.resendTimeout, errNoMoreTries)
-	defer cancel()
-	pkt, err := backoffRetry(timeoutCtx, l.resendMax, func() (*nclient4.Lease, error) {
-		return c.Request(
-			timeoutCtx,
-			withClientID(l.clientID),
-			withAllOptions(l),
-		)
+	if (l.link.Attrs().Flags & net.FlagUp) != net.FlagUp {
+		log.Printf("Link %q down. Attempting to set up", l.link.Attrs().Name)
+		if err = netlink.LinkSetUp(l.link); err != nil {
+			return err
+		}
+	}
+
+	opts := l.getAllOptions()
+
+	pkt, err := backoffRetry(l.resendMax, func() (*dhcp4.Packet, error) {
+		ok, ack, err := DhcpRequest(c, opts)
+		switch {
+		case err != nil:
+			return nil, err
+		case !ok:
+			return nil, fmt.Errorf("DHCP server NACK'd own offer")
+		default:
+			return &ack, nil
+		}
 	})
 	if err != nil {
 		return err
 	}
 
-	l.commit(pkt)
-	return nil
+	return l.commit(pkt)
 }
 
-func (l *DHCPLease) commit(lease *nclient4.Lease) {
-	l.latestLease = lease
-	ack := lease.ACK
+func (l *DHCPLease) commit(ack *dhcp4.Packet) error {
+	opts := ack.ParseOptions()
 
-	leaseTime := ack.IPAddressLeaseTime(defaultLeaseTime)
-	rebindingTime := ack.IPAddressRebindingTime(leaseTime * 85 / 100)
-	renewalTime := ack.IPAddressRenewalTime(leaseTime / 2)
+	leaseTime, err := parseLeaseTime(opts)
+	if err != nil {
+		return err
+	}
+
+	rebindingTime, err := parseRebindingTime(opts)
+	if err != nil || rebindingTime > leaseTime {
+		// Per RFC 2131 Section 4.4.5, it should default to 85% of lease time
+		rebindingTime = leaseTime * 85 / 100
+	}
+
+	renewalTime, err := parseRenewalTime(opts)
+	if err != nil || renewalTime > rebindingTime {
+		// Per RFC 2131 Section 4.4.5, it should default to 50% of lease time
+		renewalTime = leaseTime / 2
+	}
 
 	now := time.Now()
 	l.expireTime = now.Add(leaseTime)
 	l.renewalTime = now.Add(renewalTime)
 	l.rebindingTime = now.Add(rebindingTime)
+	l.ack = ack
+	l.opts = opts
+
+	return nil
 }
 
 func (l *DHCPLease) maintain() {
@@ -294,7 +296,7 @@ func (l *DHCPLease) maintain() {
 
 		switch state {
 		case leaseStateBound:
-			sleepDur = time.Until(l.renewalTime)
+			sleepDur = l.renewalTime.Sub(time.Now())
 			if sleepDur <= 0 {
 				log.Printf("%v: renewing lease", l.clientID)
 				state = leaseStateRenewing
@@ -306,7 +308,7 @@ func (l *DHCPLease) maintain() {
 				log.Printf("%v: %v", l.clientID, err)
 
 				if time.Now().After(l.rebindingTime) {
-					log.Printf("%v: renewal time expired, rebinding", l.clientID)
+					log.Printf("%v: renawal time expired, rebinding", l.clientID)
 					state = leaseStateRebinding
 				}
 			} else {
@@ -332,9 +334,6 @@ 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)
@@ -351,40 +350,44 @@ func (l *DHCPLease) downIface() {
 }
 
 func (l *DHCPLease) renew() error {
-	c, err := newDHCPClient(l.link, l.timeout)
+	c, err := newDHCPClient(l.link, l.clientID, l.timeout, l.broadcast)
 	if err != nil {
 		return err
 	}
 	defer c.Close()
 
-	timeoutCtx, cancel := context.WithTimeoutCause(l.ctx, l.resendTimeout, errNoMoreTries)
-	defer cancel()
-	lease, err := backoffRetry(timeoutCtx, l.resendMax, func() (*nclient4.Lease, error) {
-		return c.Renew(
-			timeoutCtx,
-			l.latestLease,
-			withClientID(l.clientID),
-			withAllOptions(l),
-		)
+	opts := l.getOptionsWithClientId()
+	pkt, err := backoffRetry(l.resendMax, func() (*dhcp4.Packet, error) {
+		ok, ack, err := DhcpRenew(c, *l.ack, opts)
+		switch {
+		case err != nil:
+			return nil, err
+		case !ok:
+			return nil, fmt.Errorf("DHCP server did not renew lease")
+		default:
+			return &ack, nil
+		}
 	})
 	if err != nil {
 		return err
 	}
 
-	l.commit(lease)
+	l.commit(pkt)
 	return nil
 }
 
 func (l *DHCPLease) release() error {
 	log.Printf("%v: releasing lease", l.clientID)
 
-	c, err := newDHCPClient(l.link, l.timeout)
+	c, err := newDHCPClient(l.link, l.clientID, l.timeout, l.broadcast)
 	if err != nil {
 		return err
 	}
 	defer c.Close()
 
-	if err = c.Release(l.latestLease, withClientID(l.clientID)); err != nil {
+	opts := l.getOptionsWithClientId()
+
+	if err = DhcpRelease(c, *l.ack, opts); err != nil {
 		return fmt.Errorf("failed to send DHCPRELEASE")
 	}
 
@@ -392,47 +395,33 @@ func (l *DHCPLease) release() error {
 }
 
 func (l *DHCPLease) IPNet() (*net.IPNet, error) {
-	ack := l.latestLease.ACK
-
-	mask := ack.SubnetMask()
+	mask := parseSubnetMask(l.opts)
 	if mask == nil {
 		return nil, fmt.Errorf("DHCP option Subnet Mask not found in DHCPACK")
 	}
 
 	return &net.IPNet{
-		IP:   ack.YourIPAddr,
+		IP:   l.ack.YIAddr(),
 		Mask: mask,
 	}, nil
 }
 
 func (l *DHCPLease) Gateway() net.IP {
-	ack := l.latestLease.ACK
-	gws := ack.Router()
-	if len(gws) > 0 {
-		return gws[0]
-	}
-	return nil
+	return parseRouter(l.opts)
 }
 
 func (l *DHCPLease) Routes() []*types.Route {
 	routes := []*types.Route{}
 
-	ack := l.latestLease.ACK
-
 	// RFC 3442 states that if Classless Static Routes (option 121)
 	// exist, we ignore Static Routes (option 33) and the Router/Gateway.
-	opt121Routes := ack.ClasslessStaticRoute()
-	if len(opt121Routes) > 0 {
-		for _, r := range opt121Routes {
-			routes = append(routes, &types.Route{Dst: *r.Dest, GW: r.Router})
-		}
-		return routes
+	opt121_routes := parseCIDRRoutes(l.opts)
+	if len(opt121_routes) > 0 {
+		return append(routes, opt121_routes...)
 	}
 
 	// Append Static Routes
-	if ack.Options.Has(dhcp4.OptionStaticRoutingTable) {
-		routes = append(routes, parseRoutes(ack.Options.Get(dhcp4.OptionStaticRoutingTable))...)
-	}
+	routes = append(routes, parseRoutes(l.opts)...)
 
 	// The CNI spec says even if there is a gateway specified, we must
 	// add a default route in the routes section.
@@ -449,10 +438,10 @@ func jitter(span time.Duration) time.Duration {
 	return time.Duration(float64(span) * (2.0*rand.Float64() - 1.0))
 }
 
-func backoffRetry(ctx context.Context, resendMax time.Duration, f func() (*nclient4.Lease, error)) (*nclient4.Lease, error) {
-	baseDelay := resendDelay0
+func backoffRetry(resendMax time.Duration, f func() (*dhcp4.Packet, error)) (*dhcp4.Packet, error) {
+	var baseDelay time.Duration = resendDelay0
 	var sleepTime time.Duration
-	fastRetryLimit := resendFastMax
+	var fastRetryLimit = resendFastMax
 	for {
 		pkt, err := f()
 		if err == nil {
@@ -470,23 +459,33 @@ func backoffRetry(ctx context.Context, resendMax time.Duration, f func() (*nclie
 
 		log.Printf("retrying in %f seconds", sleepTime.Seconds())
 
-		select {
-		case <-ctx.Done():
-			return nil, context.Cause(ctx)
-		case <-time.After(sleepTime):
+		time.Sleep(sleepTime)
+
 		// only adjust delay time if we are in normal backoff stage
 		if baseDelay < resendMax && fastRetryLimit == 0 {
 			baseDelay *= 2
-			}
-		}
+		} else if fastRetryLimit == 0 { // only break if we are at normal delay
+			break
 		}
 	}
 
-func newDHCPClient(
-	link netlink.Link,
-	timeout time.Duration,
-	clientOpts ...nclient4.ClientOpt,
-) (*nclient4.Client, error) {
-	clientOpts = append(clientOpts, nclient4.WithTimeout(timeout))
-	return nclient4.New(link.Attrs().Name, clientOpts...)
+	return nil, errNoMoreTries
+}
+
+func newDHCPClient(
+	link netlink.Link, clientID string,
+	timeout time.Duration,
+	broadcast bool,
+) (*dhcp4client.Client, error) {
+	pktsock, err := dhcp4client.NewPacketSock(link.Attrs().Index)
+	if err != nil {
+		return nil, err
+	}
+
+	return dhcp4client.New(
+		dhcp4client.HardwareAddr(link.Attrs().HardwareAddr),
+		dhcp4client.Timeout(timeout),
+		dhcp4client.Broadcast(broadcast),
+		dhcp4client.Connection(pktsock),
+	)
 }

plugins/ipam/dhcp/main.go

@@ -51,8 +51,6 @@ type IPAMConfig struct {
 	// To override default requesting fields, set `skipDefault` to `false`.
 	// If an field is not optional, but the server failed to provide it, error will be raised.
 	RequestOptions []RequestOption `json:"request"`
-	// The metric of routes
-	Priority int `json:"priority,omitempty"`
 }
 
 // DHCPOption represents a DHCP option. It can be a number, or a string defined in manual dhcp-options(5).
@@ -80,33 +78,25 @@ func main() {
 		var broadcast bool
 		var timeout time.Duration
 		var resendMax time.Duration
-		var resendTimeout time.Duration
 		daemonFlags := flag.NewFlagSet("daemon", flag.ExitOnError)
 		daemonFlags.StringVar(&pidfilePath, "pidfile", "", "optional path to write daemon PID to")
 		daemonFlags.StringVar(&hostPrefix, "hostprefix", "", "optional prefix to host root")
 		daemonFlags.StringVar(&socketPath, "socketpath", "", "optional dhcp server socketpath")
 		daemonFlags.BoolVar(&broadcast, "broadcast", false, "broadcast DHCP leases")
-		daemonFlags.DurationVar(&timeout, "timeout", 10*time.Second, "optional dhcp client timeout duration for each request")
-		daemonFlags.DurationVar(&resendMax, "resendmax", resendDelayMax, "optional dhcp client max resend delay between requests")
-		daemonFlags.DurationVar(&resendTimeout, "resendtimeout", defaultResendTimeout, "optional dhcp client resend timeout, no more retries after this timeout")
+		daemonFlags.DurationVar(&timeout, "timeout", 10*time.Second, "optional dhcp client timeout duration")
+		daemonFlags.DurationVar(&resendMax, "resendmax", resendDelayMax, "optional dhcp client resend max duration")
 		daemonFlags.Parse(os.Args[2:])
 
 		if socketPath == "" {
 			socketPath = defaultSocketPath
 		}
 
-		if err := runDaemon(pidfilePath, hostPrefix, socketPath, timeout, resendMax, resendTimeout, broadcast); err != nil {
+		if err := runDaemon(pidfilePath, hostPrefix, socketPath, timeout, resendMax, broadcast); err != nil {
 			log.Print(err.Error())
 			os.Exit(1)
 		}
 	} else {
-		skel.PluginMainFuncs(skel.CNIFuncs{
-			Add:   cmdAdd,
-			Check: cmdCheck,
-			Del:   cmdDel,
-			/* FIXME GC */
-			/* FIXME Status */
-		}, version.All, bv.BuildString("dhcp"))
+		skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("dhcp"))
 	}
 }
 
@@ -128,7 +118,10 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 func cmdDel(args *skel.CmdArgs) error {
 	result := struct{}{}
-	return rpcCall("DHCP.Release", args, &result)
+	if err := rpcCall("DHCP.Release", args, &result); err != nil {
+		return err
+	}
+	return nil
 }
 
 func cmdCheck(args *skel.CmdArgs) error {
@@ -141,7 +134,11 @@ func cmdCheck(args *skel.CmdArgs) error {
 	}
 
 	result := &current.Result{CNIVersion: current.ImplementedSpecVersion}
-	return rpcCall("DHCP.Allocate", args, result)
+	if err := rpcCall("DHCP.Allocate", args, result); err != nil {
+		return err
+	}
+
+	return nil
 }
 
 func getSocketPath(stdinData []byte) (string, error) {

plugins/ipam/dhcp/options.go

@@ -15,13 +15,14 @@
 package main
 
 import (
+	"encoding/binary"
 	"fmt"
 	"net"
 	"strconv"
-
-	dhcp4 "github.com/insomniacslk/dhcp/dhcpv4"
+	"time"
 
 	"github.com/containernetworking/cni/pkg/types"
+	"github.com/d2g/dhcp4"
 )
 
 var optionNameToID = map[string]dhcp4.OptionCode{
@@ -29,8 +30,8 @@ var optionNameToID = map[string]dhcp4.OptionCode{
 	"subnet-mask":             dhcp4.OptionSubnetMask,
 	"routers":                 dhcp4.OptionRouter,
 	"host-name":               dhcp4.OptionHostName,
-	"user-class":              dhcp4.OptionUserClassInformation,
-	"vendor-class-identifier": dhcp4.OptionClassIdentifier,
+	"user-class":              dhcp4.OptionUserClass,
+	"vendor-class-identifier": dhcp4.OptionVendorClassIdentifier,
 }
 
 func parseOptionName(option string) (dhcp4.OptionCode, error) {
@@ -39,9 +40,18 @@ func parseOptionName(option string) (dhcp4.OptionCode, error) {
 	}
 	i, err := strconv.ParseUint(option, 10, 8)
 	if err != nil {
-		return dhcp4.OptionPad, fmt.Errorf("Can not parse option: %w", err)
+		return 0, fmt.Errorf("Can not parse option: %w", err)
 	}
-	return dhcp4.GenericOptionCode(i), nil
+	return dhcp4.OptionCode(i), nil
+}
+
+func parseRouter(opts dhcp4.Options) net.IP {
+	if opts, ok := opts[dhcp4.OptionRouter]; ok {
+		if len(opts) == 4 {
+			return net.IP(opts)
+		}
+	}
+	return nil
 }
 
 func classfulSubnet(sn net.IP) net.IPNet {
@@ -51,12 +61,13 @@ func classfulSubnet(sn net.IP) net.IPNet {
 	}
 }
 
-func parseRoutes(opt []byte) []*types.Route {
+func parseRoutes(opts dhcp4.Options) []*types.Route {
 	// StaticRoutes format: pairs of:
 	// Dest = 4 bytes; Classful IP subnet
 	// Router = 4 bytes; IP address of router
 
 	routes := []*types.Route{}
+	if opt, ok := opts[dhcp4.OptionStaticRoute]; ok {
 		for len(opt) >= 8 {
 			sn := opt[0:4]
 			r := opt[4:8]
@@ -67,6 +78,83 @@ func parseRoutes(opt []byte) []*types.Route {
 			routes = append(routes, rt)
 			opt = opt[8:]
 		}
+	}
 
 	return routes
 }
+
+func parseCIDRRoutes(opts dhcp4.Options) []*types.Route {
+	// See RFC4332 for format (http://tools.ietf.org/html/rfc3442)
+
+	routes := []*types.Route{}
+	if opt, ok := opts[dhcp4.OptionClasslessRouteFormat]; ok {
+		for len(opt) >= 5 {
+			width := int(opt[0])
+			if width > 32 {
+				// error: can't have more than /32
+				return nil
+			}
+			// network bits are compacted to avoid zeros
+			octets := 0
+			if width > 0 {
+				octets = (width-1)/8 + 1
+			}
+
+			if len(opt) < 1+octets+4 {
+				// error: too short
+				return nil
+			}
+
+			sn := make([]byte, 4)
+			copy(sn, opt[1:octets+1])
+
+			gw := net.IP(opt[octets+1 : octets+5])
+
+			rt := &types.Route{
+				Dst: net.IPNet{
+					IP:   net.IP(sn),
+					Mask: net.CIDRMask(width, 32),
+				},
+				GW: gw,
+			}
+			routes = append(routes, rt)
+
+			opt = opt[octets+5:]
+		}
+	}
+	return routes
+}
+
+func parseSubnetMask(opts dhcp4.Options) net.IPMask {
+	mask, ok := opts[dhcp4.OptionSubnetMask]
+	if !ok {
+		return nil
+	}
+
+	return net.IPMask(mask)
+}
+
+func parseDuration(opts dhcp4.Options, code dhcp4.OptionCode, optName string) (time.Duration, error) {
+	val, ok := opts[code]
+	if !ok {
+		return 0, fmt.Errorf("option %v not found", optName)
+	}
+	if len(val) != 4 {
+		return 0, fmt.Errorf("option %v is not 4 bytes", optName)
+	}
+
+	secs := binary.BigEndian.Uint32(val)
+	return time.Duration(secs) * time.Second, nil
+}
+
+func parseLeaseTime(opts dhcp4.Options) (time.Duration, error) {
+	return parseDuration(opts, dhcp4.OptionIPAddressLeaseTime, "LeaseTime")
+}
+
+func parseRenewalTime(opts dhcp4.Options) (time.Duration, error) {
+	return parseDuration(opts, dhcp4.OptionRenewalTimeValue, "RenewalTime")
+}
+
+func parseRebindingTime(opts dhcp4.Options) (time.Duration, error) {
+	return parseDuration(opts, dhcp4.OptionRebindingTimeValue, "RebindingTime")
+}

plugins/ipam/dhcp/options_test.go

@@ -19,9 +19,8 @@ import (
 	"reflect"
 	"testing"
 
-	dhcp4 "github.com/insomniacslk/dhcp/dhcpv4"
-
 	"github.com/containernetworking/cni/pkg/types"
+	"github.com/d2g/dhcp4"
 )
 
 func validateRoutes(t *testing.T, routes []*types.Route) {
@@ -61,8 +60,17 @@ func validateRoutes(t *testing.T, routes []*types.Route) {
 }
 
 func TestParseRoutes(t *testing.T) {
-	data := []byte{10, 0, 0, 0, 10, 1, 2, 3, 192, 168, 1, 0, 192, 168, 2, 3}
-	routes := parseRoutes(data)
+	opts := make(dhcp4.Options)
+	opts[dhcp4.OptionStaticRoute] = []byte{10, 0, 0, 0, 10, 1, 2, 3, 192, 168, 1, 0, 192, 168, 2, 3}
+	routes := parseRoutes(opts)
+
+	validateRoutes(t, routes)
+}
+
+func TestParseCIDRRoutes(t *testing.T) {
+	opts := make(dhcp4.Options)
+	opts[dhcp4.OptionClasslessRouteFormat] = []byte{8, 10, 10, 1, 2, 3, 24, 192, 168, 1, 192, 168, 2, 3}
+	routes := parseCIDRRoutes(opts)
 
 	validateRoutes(t, routes)
 }
@@ -78,10 +86,10 @@ func TestParseOptionName(t *testing.T) {
 			"hostname", "host-name", dhcp4.OptionHostName, false,
 		},
 		{
-			"hostname in number", "12", dhcp4.GenericOptionCode(12), false,
+			"hostname in number", "12", dhcp4.OptionHostName, false,
 		},
 		{
-			"random string", "doNotparseMe", dhcp4.OptionPad, true,
+			"random string", "doNotparseMe", 0, true,
 		},
 	}
 	for _, tt := range tests {

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

@@ -22,6 +22,7 @@ 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"
 )
@@ -196,7 +197,7 @@ 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++
+		i.rangeIdx += 1
 		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 (
-	"testing"
-
-	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+
+	"testing"
 )
 
 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(Succeed())
+	Expect(p.Canonicalize()).To(BeNil())
 
 	store := fakestore.NewFakeStore(t.ipmap, map[string]net.IP{"rangeid": net.ParseIP(t.lastIP)})
 
@@ -262,6 +262,7 @@ 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() {
@@ -300,6 +301,7 @@ var _ = Describe("host-local ip allocator", func() {
 				Expect(err).To(HaveOccurred())
 			})
 		})
+
 	})
 	Context("when out of ips", func() {
 		It("returns a meaningful error", func() {
@@ -330,7 +332,7 @@ var _ = Describe("host-local ip allocator", func() {
 			}
 			for idx, tc := range testCases {
 				_, err := tc.run(idx)
-				Expect(err).To(HaveOccurred())
+				Expect(err).NotTo(BeNil())
 				Expect(err.Error()).To(HavePrefix("no IP addresses available in range set"))
 			}
 		})

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

@@ -21,6 +21,7 @@ import (
 
 	"github.com/containernetworking/cni/pkg/types"
 	"github.com/containernetworking/cni/pkg/version"
+
 	"github.com/containernetworking/plugins/pkg/ip"
 )
 
@@ -42,7 +43,7 @@ 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 compatibility
+// range directly, and wish to preserve backwards compatability
 type IPAMConfig struct {
 	*Range
 	Name       string

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

@@ -17,10 +17,9 @@ package allocator
 import (
 	"net"
 
-	. "github.com/onsi/ginkgo/v2"
-	. "github.com/onsi/gomega"
-
 	"github.com/containernetworking/cni/pkg/types"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
 )
 
 var _ = Describe("IPAM config", func() {
@@ -416,6 +415,7 @@ 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 families
+	// different familes
 	if len(r.RangeStart) != len(r1.RangeStart) {
 		return false
 	}

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

@@ -67,10 +67,12 @@ func (s *RangeSet) Canonicalize() error {
 		}
 		if i == 0 {
 			fam = len((*s)[i].RangeStart)
-		} else if fam != len((*s)[i].RangeStart) {
+		} else {
+			if fam != len((*s)[i].RangeStart) {
 				return fmt.Errorf("mixed address families")
 			}
 		}
+	}
 
 	// Make sure none of the ranges in the set overlap
 	l := len(*s)

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

@@ -17,7 +17,7 @@ package allocator
 import (
 	"net"
 
-	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
 
@@ -40,6 +40,7 @@ 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

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

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

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

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

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

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

@@ -15,10 +15,9 @@
 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

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

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

@@ -22,6 +22,7 @@ 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, _ string, ip net.IP, rangeID string) (bool, error) {
+func (s *FakeStore) Reserve(id string, ifname string, ip net.IP, rangeID string) (bool, error) {
 	key := ip.String()
 	if _, ok := s.ipMap[key]; !ok {
 		s.ipMap[key] = id
@@ -63,7 +63,12 @@ func (s *FakeStore) LastReservedIP(rangeID string) (net.IP, error) {
 	return ip, nil
 }
 
-func (s *FakeStore) ReleaseByID(id string, _ string) error {
+func (s *FakeStore) Release(ip net.IP) error {
+	delete(s.ipMap, ip.String())
+	return nil
+}
+
+func (s *FakeStore) ReleaseByID(id string, ifname string) error {
 	toDelete := []string{}
 	for k, v := range s.ipMap {
 		if v == id {
@@ -76,7 +81,7 @@ func (s *FakeStore) ReleaseByID(id string, _ string) error {
 	return nil
 }
 
-func (s *FakeStore) GetByID(id string, _ string) []net.IP {
+func (s *FakeStore) GetByID(id string, ifname string) []net.IP {
 	var ips []net.IP
 	for k, v := range s.ipMap {
 		if v == id {

plugins/ipam/host-local/dns.go

@@ -28,7 +28,6 @@ func parseResolvConf(filename string) (*types.DNS, error) {
 	if err != nil {
 		return nil, err
 	}
-	defer fp.Close()
 
 	dns := types.DNS{}
 	scanner := bufio.NewScanner(fp)

plugins/ipam/host-local/dns_test.go

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

plugins/ipam/host-local/host_local_test.go

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

plugins/ipam/host-local/main.go

@@ -15,31 +15,26 @@
 package main
 
 import (
-	"errors"
 	"fmt"
 	"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() {
-	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
-		/* FIXME GC */
-		/* FIXME Status */
-	}, version.All, bv.BuildString("host-local"))
+	skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("host-local"))
 }
 
 func cmdCheck(args *skel.CmdArgs) error {
+
 	ipamConf, _, err := allocator.LoadIPAMConfig(args.StdinData, args.Args)
 	if err != nil {
 		return err
@@ -53,8 +48,8 @@ func cmdCheck(args *skel.CmdArgs) error {
 	}
 	defer store.Close()
 
-	containerIPFound := store.FindByID(args.ContainerID, args.IfName)
-	if !containerIPFound {
+	containerIpFound := store.FindByID(args.ContainerID, args.IfName)
+	if containerIpFound == false {
 		return fmt.Errorf("host-local: Failed to find address added by container %v", args.ContainerID)
 	}
 
@@ -131,7 +126,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 		for _, ip := range requestedIPs {
 			errstr = errstr + " " + ip.String()
 		}
-		return errors.New(errstr)
+		return fmt.Errorf(errstr)
 	}
 
 	result.Routes = ipamConf.Routes
@@ -152,18 +147,18 @@ func cmdDel(args *skel.CmdArgs) error {
 	defer store.Close()
 
 	// Loop through all ranges, releasing all IPs, even if an error occurs
-	var errs []string
+	var errors []string
 	for idx, rangeset := range ipamConf.Ranges {
 		ipAllocator := allocator.NewIPAllocator(&rangeset, store, idx)
 
 		err := ipAllocator.Release(args.ContainerID, args.IfName)
 		if err != nil {
-			errs = append(errs, err.Error())
+			errors = append(errors, err.Error())
 		}
 	}
 
-	if errs != nil {
-		return errors.New(strings.Join(errs, ";"))
+	if errors != nil {
+		return fmt.Errorf(strings.Join(errors, ";"))
 	}
 	return nil
 }

plugins/ipam/static/main.go

@@ -68,13 +68,7 @@ type Address struct {
 }
 
 func main() {
-	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
-		/* FIXME GC */
-		/* FIXME Status */
-	}, version.All, bv.BuildString("static"))
+	skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("static"))
 }
 
 func loadNetConf(bytes []byte) (*types.NetConf, string, error) {
@@ -282,7 +276,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 	return types.PrintResult(result, confVersion)
 }
 
-func cmdDel(_ *skel.CmdArgs) error {
+func cmdDel(args *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/v2"
+	. "github.com/onsi/ginkgo"
 	. "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(result.IPs).To(HaveLen(2))
+			Expect(len(result.IPs)).To(Equal(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(result.IPs).To(HaveLen(1))
+			Expect(len(result.IPs)).To(Equal(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(result.IPs).To(HaveLen(2))
+			Expect(len(result.IPs)).To(Equal(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(result.IPs).To(HaveLen(2))
+			Expect(len(result.IPs)).To(Equal(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(result.IPs).To(HaveLen(2))
+			Expect(len(result.IPs)).To(Equal(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(result.IPs).To(HaveLen(2))
+			Expect(len(result.IPs)).To(Equal(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

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