Pass status along ipam update

Signed-off-by: Lionel Jouin <lionel.jouin@est.tech>

pkg/ipam/ipam.go

@@ -32,3 +32,7 @@ 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

@@ -128,6 +128,14 @@ func ConfigureIface(ifName string, res *current.Result) error {
 			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)
 		}

pkg/testutils/cmd.go

@@ -114,3 +114,12 @@ 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/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"}
+var AllSpecVersions = [...]string{"0.1.0", "0.2.0", "0.3.0", "0.3.1", "0.4.0", "1.0.0", "1.1.0"}
 
 // SpecVersionHasIPVersion returns true if the given CNI specification version
 // includes the "version" field in the IP address elements
@@ -39,6 +39,13 @@ 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 {

plugins/main/bridge/bridge.go

@@ -819,11 +819,11 @@ func cmdDel(args *skel.CmdArgs) error {
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("bridge"))
 }
 
@@ -1085,3 +1085,18 @@ func cmdCheck(args *skel.CmdArgs) error {
 func uniqueID(containerID, cniIface string) string {
 	return containerID + "-" + cniIface
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if conf.IPAM.Type != "" {
+		if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

plugins/main/bridge/bridge_test.go

@@ -508,6 +508,11 @@ type (
 
 func newTesterByVersion(version string, testNS, targetNS ns.NetNS) cmdAddDelTester {
 	switch {
+	case strings.HasPrefix(version, "1.1."):
+		return &testerV10x{
+			testNS:   testNS,
+			targetNS: targetNS,
+		}
 	case strings.HasPrefix(version, "1.0."):
 		return &testerV10x{
 			testNS:   testNS,
@@ -1483,6 +1488,14 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase, dataDir string) (types.Re
 	err := tester.testNS.Do(func(ns.NetNS) error {
 		defer GinkgoRecover()
 
+		// check that STATUS is
+		if testutils.SpecVersionHasSTATUS(tc.cniVersion) {
+			err := testutils.CmdStatus(func() error {
+				return cmdStatus(&skel.CmdArgs{StdinData: []byte(tc.netConfJSON(dataDir))})
+			})
+			Expect(err).NotTo(HaveOccurred())
+		}
+
 		r, raw, err := testutils.CmdAddWithArgs(tester.args, func() error {
 			return cmdAdd(tester.args)
 		})

plugins/main/dummy/dummy.go

@@ -181,11 +181,11 @@ func cmdDel(args *skel.CmdArgs) error {
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("dummy"))
 }
 
@@ -295,3 +295,16 @@ func validateCniContainerInterface(intf current.Interface) error {
 
 	return nil
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := types.NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+		return err
+	}
+
+	return nil
+}

plugins/main/dummy/dummy_test.go

@@ -106,7 +106,7 @@ type (
 
 func newTesterByVersion(version string) tester {
 	switch {
-	case strings.HasPrefix(version, "1.0."):
+	case strings.HasPrefix(version, "1."):
 		return &testerV10x{}
 	case strings.HasPrefix(version, "0.4."):
 		return &testerV04x{}
@@ -261,6 +261,13 @@ var _ = Describe("dummy Operations", func() {
 				defer GinkgoRecover()
 
 				var err error
+				if testutils.SpecVersionHasSTATUS(ver) {
+					err = testutils.CmdStatus(func() error {
+						return cmdStatus(args)
+					})
+					Expect(err).NotTo(HaveOccurred())
+				}
+
 				result, _, err = testutils.CmdAddWithArgs(args, func() error {
 					return cmdAdd(args)
 				})

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

@@ -551,11 +551,11 @@ func getLink(devname, hwaddr, kernelpath, pciaddr string, auxDev string) (netlin
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("host-device"))
 }
 
@@ -663,3 +663,20 @@ func validateCniContainerInterface(intf current.Interface) error {
 
 	return nil
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if conf.IPAM.Type != "" {
+		if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+			return err
+		}
+	}
+
+	// TODO: Check if host device exists.
+
+	return nil
+}

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

@@ -231,7 +231,7 @@ type (
 
 func newTesterByVersion(version string) tester {
 	switch {
-	case strings.HasPrefix(version, "1.0."):
+	case strings.HasPrefix(version, "1."):
 		return &testerV10x{}
 	case strings.HasPrefix(version, "0.4."):
 		return &testerV04x{}
@@ -362,6 +362,15 @@ var _ = Describe("base functionality", func() {
 				"type": "host-device",
 				"device": %q
 			}`, ver, ifname)
+
+			// if v1.1 or greater, call CmdStatus
+			if testutils.SpecVersionHasSTATUS(ver) {
+				err := testutils.CmdStatus(func() error {
+					return cmdStatus(&skel.CmdArgs{StdinData: []byte(conf)})
+				})
+				Expect(err).NotTo(HaveOccurred())
+			}
+
 			args := &skel.CmdArgs{
 				ContainerID: "dummy",
 				Netns:       targetNS.Path(),

plugins/main/ipvlan/ipvlan.go

@@ -351,11 +351,11 @@ func cmdDel(args *skel.CmdArgs) error {
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("ipvlan"))
 }
 
@@ -491,3 +491,19 @@ func validateCniContainerInterface(intf current.Interface, modeExpected string)
 
 	return nil
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+	if conf.IPAM.Type != "" {
+		if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+			return err
+		}
+	}
+
+	// TODO: Check if master interface exists.
+
+	return nil
+}

plugins/main/ipvlan/ipvlan_test.go

@@ -114,6 +114,13 @@ func ipvlanAddCheckDelTest(conf, masterName string, originalNS, targetNS ns.NetN
 	err = originalNS.Do(func(ns.NetNS) error {
 		defer GinkgoRecover()
 
+		if testutils.SpecVersionHasSTATUS(cniVersion) {
+			err = testutils.CmdStatus(func() error {
+				return cmdStatus(args)
+			})
+			Expect(err).NotTo(HaveOccurred())
+		}
+
 		result, _, err = testutils.CmdAddWithArgs(args, func() error {
 			return cmdAdd(args)
 		})
@@ -214,7 +221,7 @@ type (
 
 func newTesterByVersion(version string) tester {
 	switch {
-	case strings.HasPrefix(version, "1.0."):
+	case strings.HasPrefix(version, "1."):
 		return &testerV10x{}
 	case strings.HasPrefix(version, "0.4.") || strings.HasPrefix(version, "0.3."):
 		return &testerV04x{}

plugins/main/macvlan/macvlan.go

@@ -429,11 +429,11 @@ func cmdDel(args *skel.CmdArgs) error {
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("macvlan"))
 }
 
@@ -570,3 +570,20 @@ func validateCniContainerInterface(intf current.Interface, modeExpected string)
 
 	return nil
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if conf.IPAM.Type != "" {
+		if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+			return err
+		}
+	}
+
+	// TODO: Check if master interface exists.
+
+	return nil
+}

plugins/main/macvlan/macvlan_test.go

@@ -117,7 +117,7 @@ type (
 
 func newTesterByVersion(version string) tester {
 	switch {
-	case strings.HasPrefix(version, "1.0."):
+	case strings.HasPrefix(version, "1."):
 		return &testerV10x{}
 	case strings.HasPrefix(version, "0.4."):
 		return &testerV04x{}
@@ -322,6 +322,13 @@ var _ = Describe("macvlan Operations", func() {
 				err := originalNS.Do(func(ns.NetNS) error {
 					defer GinkgoRecover()
 
+					if testutils.SpecVersionHasSTATUS(ver) {
+						err := testutils.CmdStatus(func() error {
+							return cmdStatus(args)
+						})
+						Expect(err).NotTo(HaveOccurred())
+					}
+
 					result, _, err := testutils.CmdAddWithArgs(args, func() error {
 						return cmdAdd(args)
 					})
@@ -434,6 +441,13 @@ var _ = Describe("macvlan Operations", func() {
 				err := originalNS.Do(func(ns.NetNS) error {
 					defer GinkgoRecover()
 
+					if testutils.SpecVersionHasSTATUS(ver) {
+						err := testutils.CmdStatus(func() error {
+							return cmdStatus(args)
+						})
+						Expect(err).NotTo(HaveOccurred())
+					}
+
 					result, _, err := testutils.CmdAddWithArgs(args, func() error {
 						return cmdAdd(args)
 					})
@@ -520,6 +534,13 @@ var _ = Describe("macvlan Operations", func() {
 					defer GinkgoRecover()
 
 					var err error
+					if testutils.SpecVersionHasSTATUS(ver) {
+						err := testutils.CmdStatus(func() error {
+							return cmdStatus(args)
+						})
+						Expect(err).NotTo(HaveOccurred())
+					}
+
 					result, _, err = testutils.CmdAddWithArgs(args, func() error {
 						return cmdAdd(args)
 					})
@@ -660,6 +681,13 @@ var _ = Describe("macvlan Operations", func() {
 				err = originalNS.Do(func(ns.NetNS) error {
 					defer GinkgoRecover()
 
+					if testutils.SpecVersionHasSTATUS(ver) {
+						err := testutils.CmdStatus(func() error {
+							return cmdStatus(args)
+						})
+						Expect(err).NotTo(HaveOccurred())
+					}
+
 					result, _, err := testutils.CmdAddWithArgs(args, func() error {
 						return cmdAdd(args)
 					})

plugins/main/ptp/ptp.go

@@ -301,11 +301,11 @@ func cmdDel(args *skel.CmdArgs) error {
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("ptp"))
 }
 
@@ -409,3 +409,16 @@ func validateCniContainerInterface(intf current.Interface) error {
 
 	return nil
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+		return err
+	}
+
+	return nil
+}

plugins/main/ptp/ptp_test.go

@@ -105,7 +105,7 @@ type (
 
 func newTesterByVersion(version string) tester {
 	switch {
-	case strings.HasPrefix(version, "1.0."):
+	case strings.HasPrefix(version, "1."):
 		return &testerV10x{}
 	case strings.HasPrefix(version, "0.4."):
 		return &testerV04x{}
@@ -250,6 +250,14 @@ var _ = Describe("ptp Operations", func() {
 			defer GinkgoRecover()
 
 			var err error
+			if testutils.SpecVersionHasSTATUS(cniVersion) {
+				By("Doing a cni STATUS")
+				err = testutils.CmdStatus(func() error {
+					return cmdStatus(args)
+				})
+				Expect(err).NotTo(HaveOccurred())
+			}
+
 			result, _, err = testutils.CmdAddWithArgs(args, func() error {
 				return cmdAdd(args)
 			})

plugins/main/tap/tap.go

@@ -386,11 +386,11 @@ func cmdDel(args *skel.CmdArgs) error {
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("tap"))
 }
 
@@ -460,3 +460,18 @@ func cmdCheck(args *skel.CmdArgs) error {
 		return nil
 	})
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if conf.IPAM.Type != "" {
+		if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

plugins/main/tap/tap_test.go

@@ -108,7 +108,7 @@ type (
 
 func newTesterByVersion(version string) tester {
 	switch {
-	case strings.HasPrefix(version, "1.0."):
+	case strings.HasPrefix(version, "1."):
 		return &testerV10x{}
 	case strings.HasPrefix(version, "0.4."):
 		return &testerV04x{}
@@ -223,6 +223,13 @@ var _ = Describe("Add, check, remove tap plugin", func() {
 			err = originalNS.Do(func(ns.NetNS) error {
 				defer GinkgoRecover()
 
+				if testutils.SpecVersionHasSTATUS(ver) {
+					err := testutils.CmdStatus(func() error {
+						return cmdStatus(args)
+					})
+					Expect(err).NotTo(HaveOccurred())
+				}
+
 				result, _, err = testutils.CmdAddWithArgs(args, func() error {
 					return cmdAdd(args)
 				})
@@ -364,6 +371,13 @@ var _ = Describe("Add, check, remove tap plugin", func() {
 			err = originalNS.Do(func(ns.NetNS) error {
 				defer GinkgoRecover()
 
+				if testutils.SpecVersionHasSTATUS(ver) {
+					err := testutils.CmdStatus(func() error {
+						return cmdStatus(args)
+					})
+					Expect(err).NotTo(HaveOccurred())
+				}
+
 				result, _, err = testutils.CmdAddWithArgs(args, func() error {
 					return cmdAdd(args)
 				})

plugins/main/vlan/vlan.go

@@ -261,11 +261,11 @@ func cmdDel(args *skel.CmdArgs) error {
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("vlan"))
 }
 
@@ -399,3 +399,18 @@ func validateCniContainerInterface(intf current.Interface, vlanID int, mtu int)
 
 	return nil
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+		return err
+	}
+
+	// TODO: Check if master interface exists.
+
+	return nil
+}

plugins/main/vlan/vlan_test.go

@@ -113,7 +113,7 @@ type (
 
 func newTesterByVersion(version string) tester {
 	switch {
-	case strings.HasPrefix(version, "1.0."):
+	case strings.HasPrefix(version, "1."):
 		return &testerV10x{}
 	case strings.HasPrefix(version, "0.4."):
 		return &testerV04x{}
@@ -354,6 +354,13 @@ var _ = Describe("vlan Operations", func() {
 					defer GinkgoRecover()
 
 					var err error
+					if testutils.SpecVersionHasSTATUS(ver) {
+						err := testutils.CmdStatus(func() error {
+							return cmdStatus(args)
+						})
+						Expect(err).NotTo(HaveOccurred())
+					}
+
 					result, _, err = testutils.CmdAddWithArgs(args, func() error {
 						return cmdAdd(args)
 					})

plugins/main/windows/win-bridge/win-bridge_windows.go

@@ -216,10 +216,25 @@ func cmdCheck(_ *skel.CmdArgs) error {
 
 func main() {
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("win-bridge"))
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if conf.IPAM.Type != "" {
+		if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

plugins/main/windows/win-overlay/win-overlay_windows.go

@@ -106,13 +106,13 @@ func cmdHcnAdd(args *skel.CmdArgs, n *NetConf) (*current.Result, error) {
 		return nil, errors.Annotatef(err, "error while hcn.GetNetworkByName(%s)", networkName)
 	}
 	if hcnNetwork == nil {
-		return  nil, fmt.Errorf("network %v is not found", networkName)
+		return nil, fmt.Errorf("network %v is not found", networkName)
 	}
 	if hnsNetwork == nil {
 		return nil, fmt.Errorf("network %v not found", networkName)
 	}
 
-	if !strings.EqualFold(string (hcnNetwork.Type), "Overlay") {
+	if !strings.EqualFold(string(hcnNetwork.Type), "Overlay") {
 		return nil, fmt.Errorf("network %v is of an unexpected type: %v", networkName, hcnNetwork.Type)
 	}
 
@@ -131,7 +131,6 @@ func cmdHcnAdd(args *skel.CmdArgs, n *NetConf) (*current.Result, error) {
 			n.ApplyOutboundNatPolicy(hnsNetwork.Subnets[0].AddressPrefix)
 		}
 		hcnEndpoint, err := hns.GenerateHcnEndpoint(epInfo, &n.NetConf)
-
 		if err != nil {
 			return nil, errors.Annotate(err, "error while generating HostComputeEndpoint")
 		}
@@ -142,15 +141,14 @@ func cmdHcnAdd(args *skel.CmdArgs, n *NetConf) (*current.Result, error) {
 	}
 
 	result, err := hns.ConstructHcnResult(hcnNetwork, hcnEndpoint)
-
 	if err != nil {
 		ipam.ExecDel(n.IPAM.Type, args.StdinData)
 		return nil, errors.Annotate(err, "error while constructing HostComputeEndpoint addition result")
 	}
 
 	return result, nil
-
 }
+
 func cmdHnsAdd(args *skel.CmdArgs, n *NetConf) (*current.Result, error) {
 	success := false
 
@@ -243,6 +241,7 @@ func cmdHnsAdd(args *skel.CmdArgs, n *NetConf) (*current.Result, error) {
 	success = true
 	return result, nil
 }
+
 func cmdAdd(args *skel.CmdArgs) error {
 	n, cniVersion, err := loadNetConf(args.StdinData)
 	if err != nil {
@@ -292,7 +291,20 @@ func main() {
 		Add:    cmdAdd,
 		Check:  cmdCheck,
 		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("win-overlay"))
 }
+
+func cmdStatus(args *skel.CmdArgs) error {
+	conf := NetConf{}
+	if err := json.Unmarshal(args.StdinData, &conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %w", err)
+	}
+
+	if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+		return err
+	}
+
+	return nil
+}

plugins/sample/main.go

@@ -24,6 +24,7 @@ import (
 	"github.com/containernetworking/cni/pkg/types"
 	current "github.com/containernetworking/cni/pkg/types/100"
 	"github.com/containernetworking/cni/pkg/version"
+	"github.com/containernetworking/plugins/pkg/ipam"
 	bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
 )
 
@@ -151,11 +152,11 @@ func cmdDel(args *skel.CmdArgs) error {
 func main() {
 	// replace TODO with your plugin name
 	skel.PluginMainFuncs(skel.CNIFuncs{
-		Add:   cmdAdd,
-		Check: cmdCheck,
-		Del:   cmdDel,
+		Add:    cmdAdd,
+		Check:  cmdCheck,
+		Del:    cmdDel,
+		Status: cmdStatus,
 		/* FIXME GC */
-		/* FIXME Status */
 	}, version.All, bv.BuildString("TODO"))
 }
 
@@ -163,3 +164,27 @@ func cmdCheck(_ *skel.CmdArgs) error {
 	// TODO: implement
 	return fmt.Errorf("not implemented")
 }
+
+// cmdStatus implements the STATUS command, which indicates whether or not
+// this plugin is able to accept ADD requests.
+//
+// If the plugin has external dependencies, such as a daemon
+// or chained ipam plugin, it should determine their status. If all is well,
+// and an ADD can be successfully processed, return nil
+func cmdStatus(args *skel.CmdArgs) error {
+	conf, err := parseConfig(args.StdinData)
+	if err != nil {
+		return err
+	}
+	_ = conf
+
+	// If this plugins delegates IPAM, ensure that IPAM is also running
+	if err := ipam.ExecStatus(conf.IPAM.Type, args.StdinData); err != nil {
+		return err
+	}
+
+	// TODO: implement STATUS here
+	// e.g. querying an external deamon, or delegating STATUS to an IPAM plugin
+
+	return nil
+}