VRF CNI: Add an optional table parameter.

When specified from the user, the VRF will get assigned to the given
tableid instead of having the CNI to choose for a free one.

Signed-off-by: Federico Paolinelli <fpaoline@redhat.com>

plugins/meta/vrf/vrf_test.go

@@ -354,6 +354,69 @@ var _ = Describe("vrf plugin", func() {
 		Entry("added to different vrfs with same ip IPV6", VRF0Name, VRF1Name, "2A00:0C98:2060:A000:0001:0000:1d1e:ca75/64", "2A00:0C98:2060:A000:0001:0000:1d1e:ca75/64"),
 	)
 
+	DescribeTable("handles tableid conflicts",
+		func(vrf0, vrf1 string, tableid0, tableid1 int, expectedError string) {
+			conf0 := configWithTableFor("test", IF0Name, vrf0, "10.0.0.2/24", tableid0)
+			conf1 := configWithTableFor("test1", IF1Name, vrf1, "10.0.0.2/24", tableid1)
+
+			By("Adding the first interface to first vrf", func() {
+				err := originalNS.Do(func(ns.NetNS) error {
+					defer GinkgoRecover()
+					args := &skel.CmdArgs{
+						ContainerID: "dummy",
+						Netns:       targetNS.Path(),
+						IfName:      IF0Name,
+						StdinData:   conf0,
+					}
+					_, _, err := testutils.CmdAddWithArgs(args, func() error {
+						return cmdAdd(args)
+					})
+					Expect(err).NotTo(HaveOccurred())
+					return nil
+				})
+				Expect(err).NotTo(HaveOccurred())
+			})
+
+			By("Checking that the first vrf has the right routing table", func() {
+				err := targetNS.Do(func(ns.NetNS) error {
+					defer GinkgoRecover()
+
+					l, err := netlink.LinkByName(vrf0)
+					Expect(err).NotTo(HaveOccurred())
+					vrf := l.(*netlink.Vrf)
+					Expect(vrf.Table).To(Equal(uint32(tableid0)))
+					return nil
+				})
+				Expect(err).NotTo(HaveOccurred())
+			})
+
+			By("Adding the second interface to second vrf", func() {
+				err := originalNS.Do(func(ns.NetNS) error {
+					defer GinkgoRecover()
+					args := &skel.CmdArgs{
+						ContainerID: "dummy",
+						Netns:       targetNS.Path(),
+						IfName:      IF1Name,
+						StdinData:   conf1,
+					}
+					_, _, err := testutils.CmdAddWithArgs(args, func() error {
+						return cmdAdd(args)
+					})
+					return err
+				})
+				if expectedError != "" {
+					Expect(err).To(HaveOccurred())
+					Expect(err.Error()).To(ContainSubstring(expectedError))
+					return
+				}
+				Expect(err).NotTo(HaveOccurred())
+			})
+		},
+		Entry("same vrf with same tableid", VRF0Name, VRF0Name, 1001, 1001, ""),
+		Entry("different vrf with same tableid", VRF0Name, VRF1Name, 1001, 1001, ""),
+		Entry("same vrf with different tableids", VRF0Name, VRF0Name, 1001, 1002, "already exist with different routing table"),
+	)
+
 	It("removes the VRF only when the last interface is removed", func() {
 		conf0 := configFor("test", IF0Name, VRF0Name, "10.0.0.2/24")
 		conf1 := configFor("test1", IF1Name, VRF0Name, "10.0.0.2/24")
@@ -605,6 +668,30 @@ func configFor(name, intf, vrf, ip string) []byte {
 	return []byte(conf)
 }
 
+func configWithTableFor(name, intf, vrf, ip string, tableID int) []byte {
+	conf := fmt.Sprintf(`{
+		"name": "%s",
+		"type": "vrf",
+		"cniVersion": "0.3.1",
+		"vrfName": "%s",
+		"table": %d,
+		"prevResult": {
+			"interfaces": [
+				{"name": "%s", "sandbox":"netns"}
+			],
+			"ips": [
+				{
+					"version": "4",
+					"address": "%s",
+					"gateway": "10.0.0.1",
+					"interface": 0
+				}
+			]
+		}
+	}`, name, vrf, tableID, intf, ip)
+	return []byte(conf)
+}
+
 func checkInterfaceOnVRF(vrfName, intfName string) {
 	vrf, err := netlink.LinkByName(vrfName)
 	Expect(err).NotTo(HaveOccurred())