mirror of
https://github.com/rancher/plugins.git
synced 2025-07-09 05:04:51 +00:00
2e9e87732f
This change allows the host-local allocator to allocate multiple IPs. This is intended to enable dual-stack, but is not limited to only two subnets or separate address families.
337 lines
9.0 KiB
Go
337 lines
9.0 KiB
Go
// Copyright 2017 CNI authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package allocator
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import (
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"fmt"
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"net"
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"github.com/containernetworking/cni/pkg/types"
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"github.com/containernetworking/cni/pkg/types/current"
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fakestore "github.com/containernetworking/plugins/plugins/ipam/host-local/backend/testing"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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type AllocatorTestCase struct {
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subnet string
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ipmap map[string]string
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expectResult string
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lastIP string
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}
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func mkalloc() IPAllocator {
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ipnet, _ := types.ParseCIDR("192.168.1.0/24")
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r := Range{
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Subnet: types.IPNet(*ipnet),
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}
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r.Canonicalize()
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store := fakestore.NewFakeStore(map[string]string{}, map[string]net.IP{})
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alloc := IPAllocator{
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netName: "netname",
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ipRange: r,
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store: store,
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rangeID: "rangeid",
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}
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return alloc
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}
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func (t AllocatorTestCase) run(idx int) (*current.IPConfig, error) {
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fmt.Fprintln(GinkgoWriter, "Index:", idx)
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subnet, err := types.ParseCIDR(t.subnet)
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if err != nil {
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return nil, err
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}
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conf := Range{
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Subnet: types.IPNet(*subnet),
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}
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Expect(conf.Canonicalize()).To(BeNil())
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store := fakestore.NewFakeStore(t.ipmap, map[string]net.IP{"rangeid": net.ParseIP(t.lastIP)})
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alloc := IPAllocator{
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"netname",
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conf,
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store,
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"rangeid",
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}
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return alloc.Get("ID", nil)
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}
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var _ = Describe("host-local ip allocator", func() {
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Context("RangeIter", func() {
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It("should loop correctly from the beginning", func() {
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r := RangeIter{
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start: net.IP{10, 0, 0, 0},
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low: net.IP{10, 0, 0, 0},
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high: net.IP{10, 0, 0, 5},
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}
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 0}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 1}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 2}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 3}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 4}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 5}))
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Expect(r.Next()).To(BeNil())
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})
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It("should loop correctly from the end", func() {
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r := RangeIter{
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start: net.IP{10, 0, 0, 5},
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low: net.IP{10, 0, 0, 0},
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high: net.IP{10, 0, 0, 5},
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}
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 5}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 0}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 1}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 2}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 3}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 4}))
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Expect(r.Next()).To(BeNil())
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})
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It("should loop correctly from the middle", func() {
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r := RangeIter{
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start: net.IP{10, 0, 0, 3},
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low: net.IP{10, 0, 0, 0},
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high: net.IP{10, 0, 0, 5},
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}
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 3}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 4}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 5}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 0}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 1}))
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Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 2}))
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Expect(r.Next()).To(BeNil())
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})
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})
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Context("when has free ip", func() {
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It("should allocate ips in round robin", func() {
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testCases := []AllocatorTestCase{
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// fresh start
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{
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subnet: "10.0.0.0/29",
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ipmap: map[string]string{},
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expectResult: "10.0.0.2",
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lastIP: "",
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},
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{
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subnet: "2001:db8:1::0/64",
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ipmap: map[string]string{},
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expectResult: "2001:db8:1::2",
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lastIP: "",
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},
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{
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subnet: "10.0.0.0/30",
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ipmap: map[string]string{},
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expectResult: "10.0.0.2",
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lastIP: "",
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},
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{
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subnet: "10.0.0.0/29",
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ipmap: map[string]string{
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"10.0.0.2": "id",
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},
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expectResult: "10.0.0.3",
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lastIP: "",
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},
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// next ip of last reserved ip
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{
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subnet: "10.0.0.0/29",
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ipmap: map[string]string{},
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expectResult: "10.0.0.6",
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lastIP: "10.0.0.5",
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},
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{
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subnet: "10.0.0.0/29",
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ipmap: map[string]string{
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"10.0.0.4": "id",
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"10.0.0.5": "id",
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},
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expectResult: "10.0.0.6",
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lastIP: "10.0.0.3",
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},
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// round robin to the beginning
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{
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subnet: "10.0.0.0/29",
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ipmap: map[string]string{
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"10.0.0.6": "id",
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},
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expectResult: "10.0.0.2",
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lastIP: "10.0.0.5",
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},
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// lastIP is out of range
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{
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subnet: "10.0.0.0/29",
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ipmap: map[string]string{
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"10.0.0.2": "id",
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},
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expectResult: "10.0.0.3",
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lastIP: "10.0.0.128",
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},
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// wrap around and reserve lastIP
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{
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subnet: "10.0.0.0/29",
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ipmap: map[string]string{
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"10.0.0.2": "id",
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"10.0.0.4": "id",
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"10.0.0.5": "id",
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"10.0.0.6": "id",
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},
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expectResult: "10.0.0.3",
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lastIP: "10.0.0.3",
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},
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}
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for idx, tc := range testCases {
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res, err := tc.run(idx)
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Expect(err).ToNot(HaveOccurred())
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Expect(res.Address.IP.String()).To(Equal(tc.expectResult))
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}
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})
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It("should not allocate the broadcast address", func() {
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alloc := mkalloc()
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for i := 2; i < 255; i++ {
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res, err := alloc.Get("ID", nil)
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Expect(err).ToNot(HaveOccurred())
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s := fmt.Sprintf("192.168.1.%d/24", i)
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Expect(s).To(Equal(res.Address.String()))
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fmt.Fprintln(GinkgoWriter, "got ip", res.Address.String())
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}
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x, err := alloc.Get("ID", nil)
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fmt.Fprintln(GinkgoWriter, "got ip", x)
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Expect(err).To(HaveOccurred())
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})
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It("should allocate in a round-robin fashion", func() {
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alloc := mkalloc()
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res, err := alloc.Get("ID", nil)
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Expect(err).ToNot(HaveOccurred())
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Expect(res.Address.String()).To(Equal("192.168.1.2/24"))
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err = alloc.Release("ID")
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Expect(err).ToNot(HaveOccurred())
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res, err = alloc.Get("ID", nil)
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Expect(err).ToNot(HaveOccurred())
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Expect(res.Address.String()).To(Equal("192.168.1.3/24"))
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})
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It("should allocate RangeStart first", func() {
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alloc := mkalloc()
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alloc.ipRange.RangeStart = net.IP{192, 168, 1, 10}
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res, err := alloc.Get("ID", nil)
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Expect(err).ToNot(HaveOccurred())
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Expect(res.Address.String()).To(Equal("192.168.1.10/24"))
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res, err = alloc.Get("ID", nil)
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Expect(err).ToNot(HaveOccurred())
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Expect(res.Address.String()).To(Equal("192.168.1.11/24"))
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})
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It("should allocate RangeEnd but not past RangeEnd", func() {
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alloc := mkalloc()
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alloc.ipRange.RangeEnd = net.IP{192, 168, 1, 5}
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for i := 1; i < 5; i++ {
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res, err := alloc.Get("ID", nil)
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Expect(err).ToNot(HaveOccurred())
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// i+1 because the gateway address is skipped
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Expect(res.Address.String()).To(Equal(fmt.Sprintf("192.168.1.%d/24", i+1)))
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}
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_, err := alloc.Get("ID", nil)
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Expect(err).To(HaveOccurred())
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})
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Context("when requesting a specific IP", func() {
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It("must allocate the requested IP", func() {
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alloc := mkalloc()
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requestedIP := net.IP{192, 168, 1, 5}
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res, err := alloc.Get("ID", requestedIP)
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Expect(err).ToNot(HaveOccurred())
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Expect(res.Address.IP.String()).To(Equal(requestedIP.String()))
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})
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It("must fail when the requested IP is allocated", func() {
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alloc := mkalloc()
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requestedIP := net.IP{192, 168, 1, 5}
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res, err := alloc.Get("ID", requestedIP)
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Expect(err).ToNot(HaveOccurred())
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Expect(res.Address.IP.String()).To(Equal(requestedIP.String()))
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_, err = alloc.Get("ID", requestedIP)
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Expect(err).To(MatchError(`requested IP address "192.168.1.5" is not available in network: netname 192.168.1.0/24`))
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})
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It("must return an error when the requested IP is after RangeEnd", func() {
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alloc := mkalloc()
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alloc.ipRange.RangeEnd = net.IP{192, 168, 1, 5}
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requestedIP := net.IP{192, 168, 1, 6}
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_, err := alloc.Get("ID", requestedIP)
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Expect(err).To(HaveOccurred())
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})
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It("must return an error when the requested IP is before RangeStart", func() {
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alloc := mkalloc()
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alloc.ipRange.RangeStart = net.IP{192, 168, 1, 6}
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requestedIP := net.IP{192, 168, 1, 5}
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_, err := alloc.Get("ID", requestedIP)
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Expect(err).To(HaveOccurred())
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})
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})
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})
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Context("when out of ips", func() {
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It("returns a meaningful error", func() {
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testCases := []AllocatorTestCase{
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{
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subnet: "10.0.0.0/30",
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ipmap: map[string]string{
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"10.0.0.2": "id",
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"10.0.0.3": "id",
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},
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},
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{
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subnet: "10.0.0.0/29",
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ipmap: map[string]string{
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"10.0.0.2": "id",
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"10.0.0.3": "id",
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"10.0.0.4": "id",
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"10.0.0.5": "id",
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"10.0.0.6": "id",
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"10.0.0.7": "id",
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},
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},
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}
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for idx, tc := range testCases {
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_, err := tc.run(idx)
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Expect(err).To(MatchError("no IP addresses available in network: netname " + tc.subnet))
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}
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})
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})
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})
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