mirror of
https://github.com/rancher/plugins.git
synced 2025-07-09 05:04:51 +00:00
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
|
|
//
|
|
// 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 allocator
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
|
|
"github.com/containernetworking/cni/pkg/types"
|
|
"github.com/containernetworking/cni/pkg/types/current"
|
|
fakestore "github.com/containernetworking/plugins/plugins/ipam/host-local/backend/testing"
|
|
. "github.com/onsi/ginkgo"
|
|
. "github.com/onsi/gomega"
|
|
)
|
|
|
|
type AllocatorTestCase struct {
|
|
subnet string
|
|
ipmap map[string]string
|
|
expectResult string
|
|
lastIP string
|
|
}
|
|
|
|
func mkalloc() IPAllocator {
|
|
ipnet, _ := types.ParseCIDR("192.168.1.0/24")
|
|
|
|
r := Range{
|
|
Subnet: types.IPNet(*ipnet),
|
|
}
|
|
r.Canonicalize()
|
|
store := fakestore.NewFakeStore(map[string]string{}, map[string]net.IP{})
|
|
|
|
alloc := IPAllocator{
|
|
netName: "netname",
|
|
ipRange: r,
|
|
store: store,
|
|
rangeID: "rangeid",
|
|
}
|
|
|
|
return alloc
|
|
}
|
|
|
|
func (t AllocatorTestCase) run(idx int) (*current.IPConfig, error) {
|
|
fmt.Fprintln(GinkgoWriter, "Index:", idx)
|
|
subnet, err := types.ParseCIDR(t.subnet)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
conf := Range{
|
|
Subnet: types.IPNet(*subnet),
|
|
}
|
|
|
|
Expect(conf.Canonicalize()).To(BeNil())
|
|
|
|
store := fakestore.NewFakeStore(t.ipmap, map[string]net.IP{"rangeid": net.ParseIP(t.lastIP)})
|
|
|
|
alloc := IPAllocator{
|
|
"netname",
|
|
conf,
|
|
store,
|
|
"rangeid",
|
|
}
|
|
|
|
return alloc.Get("ID", nil)
|
|
}
|
|
|
|
var _ = Describe("host-local ip allocator", func() {
|
|
Context("RangeIter", func() {
|
|
It("should loop correctly from the beginning", func() {
|
|
r := RangeIter{
|
|
start: net.IP{10, 0, 0, 0},
|
|
low: net.IP{10, 0, 0, 0},
|
|
high: net.IP{10, 0, 0, 5},
|
|
}
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 0}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 1}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 2}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 3}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 4}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 5}))
|
|
Expect(r.Next()).To(BeNil())
|
|
})
|
|
|
|
It("should loop correctly from the end", func() {
|
|
r := RangeIter{
|
|
start: net.IP{10, 0, 0, 5},
|
|
low: net.IP{10, 0, 0, 0},
|
|
high: net.IP{10, 0, 0, 5},
|
|
}
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 5}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 0}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 1}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 2}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 3}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 4}))
|
|
Expect(r.Next()).To(BeNil())
|
|
})
|
|
|
|
It("should loop correctly from the middle", func() {
|
|
r := RangeIter{
|
|
start: net.IP{10, 0, 0, 3},
|
|
low: net.IP{10, 0, 0, 0},
|
|
high: net.IP{10, 0, 0, 5},
|
|
}
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 3}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 4}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 5}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 0}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 1}))
|
|
Expect(r.Next()).To(Equal(net.IP{10, 0, 0, 2}))
|
|
Expect(r.Next()).To(BeNil())
|
|
})
|
|
|
|
})
|
|
|
|
Context("when has free ip", func() {
|
|
It("should allocate ips in round robin", func() {
|
|
testCases := []AllocatorTestCase{
|
|
// fresh start
|
|
{
|
|
subnet: "10.0.0.0/29",
|
|
ipmap: map[string]string{},
|
|
expectResult: "10.0.0.2",
|
|
lastIP: "",
|
|
},
|
|
{
|
|
subnet: "2001:db8:1::0/64",
|
|
ipmap: map[string]string{},
|
|
expectResult: "2001:db8:1::2",
|
|
lastIP: "",
|
|
},
|
|
{
|
|
subnet: "10.0.0.0/30",
|
|
ipmap: map[string]string{},
|
|
expectResult: "10.0.0.2",
|
|
lastIP: "",
|
|
},
|
|
{
|
|
subnet: "10.0.0.0/29",
|
|
ipmap: map[string]string{
|
|
"10.0.0.2": "id",
|
|
},
|
|
expectResult: "10.0.0.3",
|
|
lastIP: "",
|
|
},
|
|
// next ip of last reserved ip
|
|
{
|
|
subnet: "10.0.0.0/29",
|
|
ipmap: map[string]string{},
|
|
expectResult: "10.0.0.6",
|
|
lastIP: "10.0.0.5",
|
|
},
|
|
{
|
|
subnet: "10.0.0.0/29",
|
|
ipmap: map[string]string{
|
|
"10.0.0.4": "id",
|
|
"10.0.0.5": "id",
|
|
},
|
|
expectResult: "10.0.0.6",
|
|
lastIP: "10.0.0.3",
|
|
},
|
|
// round robin to the beginning
|
|
{
|
|
subnet: "10.0.0.0/29",
|
|
ipmap: map[string]string{
|
|
"10.0.0.6": "id",
|
|
},
|
|
expectResult: "10.0.0.2",
|
|
lastIP: "10.0.0.5",
|
|
},
|
|
// lastIP is out of range
|
|
{
|
|
subnet: "10.0.0.0/29",
|
|
ipmap: map[string]string{
|
|
"10.0.0.2": "id",
|
|
},
|
|
expectResult: "10.0.0.3",
|
|
lastIP: "10.0.0.128",
|
|
},
|
|
// wrap around and reserve lastIP
|
|
{
|
|
subnet: "10.0.0.0/29",
|
|
ipmap: map[string]string{
|
|
"10.0.0.2": "id",
|
|
"10.0.0.4": "id",
|
|
"10.0.0.5": "id",
|
|
"10.0.0.6": "id",
|
|
},
|
|
expectResult: "10.0.0.3",
|
|
lastIP: "10.0.0.3",
|
|
},
|
|
}
|
|
|
|
for idx, tc := range testCases {
|
|
res, err := tc.run(idx)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(res.Address.IP.String()).To(Equal(tc.expectResult))
|
|
}
|
|
})
|
|
|
|
It("should not allocate the broadcast address", func() {
|
|
alloc := mkalloc()
|
|
for i := 2; i < 255; i++ {
|
|
res, err := alloc.Get("ID", nil)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
s := fmt.Sprintf("192.168.1.%d/24", i)
|
|
Expect(s).To(Equal(res.Address.String()))
|
|
fmt.Fprintln(GinkgoWriter, "got ip", res.Address.String())
|
|
}
|
|
|
|
x, err := alloc.Get("ID", nil)
|
|
fmt.Fprintln(GinkgoWriter, "got ip", x)
|
|
Expect(err).To(HaveOccurred())
|
|
})
|
|
|
|
It("should allocate in a round-robin fashion", func() {
|
|
alloc := mkalloc()
|
|
res, err := alloc.Get("ID", nil)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(res.Address.String()).To(Equal("192.168.1.2/24"))
|
|
|
|
err = alloc.Release("ID")
|
|
Expect(err).ToNot(HaveOccurred())
|
|
|
|
res, err = alloc.Get("ID", nil)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(res.Address.String()).To(Equal("192.168.1.3/24"))
|
|
|
|
})
|
|
|
|
It("should allocate RangeStart first", func() {
|
|
alloc := mkalloc()
|
|
alloc.ipRange.RangeStart = net.IP{192, 168, 1, 10}
|
|
res, err := alloc.Get("ID", nil)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(res.Address.String()).To(Equal("192.168.1.10/24"))
|
|
|
|
res, err = alloc.Get("ID", nil)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(res.Address.String()).To(Equal("192.168.1.11/24"))
|
|
})
|
|
|
|
It("should allocate RangeEnd but not past RangeEnd", func() {
|
|
alloc := mkalloc()
|
|
alloc.ipRange.RangeEnd = net.IP{192, 168, 1, 5}
|
|
|
|
for i := 1; i < 5; i++ {
|
|
res, err := alloc.Get("ID", nil)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
// i+1 because the gateway address is skipped
|
|
Expect(res.Address.String()).To(Equal(fmt.Sprintf("192.168.1.%d/24", i+1)))
|
|
}
|
|
|
|
_, err := alloc.Get("ID", nil)
|
|
Expect(err).To(HaveOccurred())
|
|
})
|
|
|
|
Context("when requesting a specific IP", func() {
|
|
It("must allocate the requested IP", func() {
|
|
alloc := mkalloc()
|
|
requestedIP := net.IP{192, 168, 1, 5}
|
|
res, err := alloc.Get("ID", requestedIP)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(res.Address.IP.String()).To(Equal(requestedIP.String()))
|
|
})
|
|
|
|
It("must fail when the requested IP is allocated", func() {
|
|
alloc := mkalloc()
|
|
requestedIP := net.IP{192, 168, 1, 5}
|
|
res, err := alloc.Get("ID", requestedIP)
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(res.Address.IP.String()).To(Equal(requestedIP.String()))
|
|
|
|
_, err = alloc.Get("ID", requestedIP)
|
|
Expect(err).To(MatchError(`requested IP address "192.168.1.5" is not available in network: netname 192.168.1.0/24`))
|
|
})
|
|
|
|
It("must return an error when the requested IP is after RangeEnd", func() {
|
|
alloc := mkalloc()
|
|
alloc.ipRange.RangeEnd = net.IP{192, 168, 1, 5}
|
|
requestedIP := net.IP{192, 168, 1, 6}
|
|
_, err := alloc.Get("ID", requestedIP)
|
|
Expect(err).To(HaveOccurred())
|
|
})
|
|
|
|
It("must return an error when the requested IP is before RangeStart", func() {
|
|
alloc := mkalloc()
|
|
alloc.ipRange.RangeStart = net.IP{192, 168, 1, 6}
|
|
requestedIP := net.IP{192, 168, 1, 5}
|
|
_, err := alloc.Get("ID", requestedIP)
|
|
Expect(err).To(HaveOccurred())
|
|
})
|
|
})
|
|
|
|
})
|
|
Context("when out of ips", func() {
|
|
It("returns a meaningful error", func() {
|
|
testCases := []AllocatorTestCase{
|
|
{
|
|
subnet: "10.0.0.0/30",
|
|
ipmap: map[string]string{
|
|
"10.0.0.2": "id",
|
|
"10.0.0.3": "id",
|
|
},
|
|
},
|
|
{
|
|
subnet: "10.0.0.0/29",
|
|
ipmap: map[string]string{
|
|
"10.0.0.2": "id",
|
|
"10.0.0.3": "id",
|
|
"10.0.0.4": "id",
|
|
"10.0.0.5": "id",
|
|
"10.0.0.6": "id",
|
|
"10.0.0.7": "id",
|
|
},
|
|
},
|
|
}
|
|
for idx, tc := range testCases {
|
|
_, err := tc.run(idx)
|
|
Expect(err).To(MatchError("no IP addresses available in network: netname " + tc.subnet))
|
|
}
|
|
})
|
|
})
|
|
})
|