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Separate subnet utils into a standalone package
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test") | ||
|
|
||
| go_library( | ||
| name = "go_default_library", | ||
| srcs = ["subnet.go"], | ||
| importpath = "k8s.io/kops/pkg/util/subnet", | ||
| visibility = ["//visibility:public"], | ||
| ) | ||
|
|
||
| go_test( | ||
| name = "go_default_test", | ||
| srcs = ["subnet_test.go"], | ||
| embed = [":go_default_library"], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| Copyright 2016 The Kubernetes 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 subnet | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "fmt" | ||
| "net" | ||
| ) | ||
|
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| // Overlap checks if two subnets overlap | ||
| func Overlap(l, r *net.IPNet) bool { | ||
| return l.Contains(r.IP) || r.Contains(l.IP) | ||
| } | ||
|
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| // BelongsTo checks if child is a subnet of parent | ||
| func BelongsTo(parent *net.IPNet, child *net.IPNet) bool { | ||
| parentOnes, parentBits := parent.Mask.Size() | ||
| childOnes, childBits := child.Mask.Size() | ||
| if childBits != parentBits { | ||
| return false | ||
| } | ||
| if parentOnes > childOnes { | ||
| return false | ||
| } | ||
| childMasked := child.IP.Mask(parent.Mask) | ||
| parentMasked := parent.IP.Mask(parent.Mask) | ||
| return childMasked.Equal(parentMasked) | ||
| } | ||
|
|
||
| // SplitInto8 splits the parent IPNet into 8 subnets | ||
| func SplitInto8(parent *net.IPNet) ([]*net.IPNet, error) { | ||
| networkLength, _ := parent.Mask.Size() | ||
| networkLength += 3 | ||
|
|
||
| var subnets []*net.IPNet | ||
| for i := 0; i < 8; i++ { | ||
| ip4 := parent.IP.To4() | ||
| if ip4 != nil { | ||
| n := binary.BigEndian.Uint32(ip4) | ||
| n += uint32(i) << uint(32-networkLength) | ||
| subnetIP := make(net.IP, len(ip4)) | ||
| binary.BigEndian.PutUint32(subnetIP, n) | ||
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| subnets = append(subnets, &net.IPNet{ | ||
| IP: subnetIP, | ||
| Mask: net.CIDRMask(networkLength, 32), | ||
| }) | ||
| } else { | ||
| return nil, fmt.Errorf("Unexpected IP address type: %s", parent) | ||
| } | ||
| } | ||
|
|
||
| return subnets, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /* | ||
| Copyright 2016 The Kubernetes 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 subnet | ||
|
|
||
| import ( | ||
| "net" | ||
| "reflect" | ||
| "testing" | ||
| ) | ||
|
|
||
| func Test_BelongsTo(t *testing.T) { | ||
| grid := []struct { | ||
| L string | ||
| R string | ||
| Belongs bool | ||
| }{ | ||
| { | ||
| L: "192.168.1.0/24", | ||
| R: "192.168.0.0/24", | ||
| Belongs: false, | ||
| }, | ||
| { | ||
| L: "192.168.0.0/16", | ||
| R: "192.168.0.0/24", | ||
| Belongs: true, | ||
| }, | ||
| { | ||
| L: "192.168.0.0/24", | ||
| R: "192.168.0.0/16", | ||
| Belongs: false, | ||
| }, | ||
| { | ||
| L: "192.168.0.0/16", | ||
| R: "192.168.0.0/16", | ||
| Belongs: true, // Not a strict subnet | ||
| }, | ||
| { | ||
| L: "192.168.0.1/16", | ||
| R: "192.168.0.0/24", | ||
| Belongs: true, | ||
| }, | ||
| { | ||
| L: "0.0.0.0/0", | ||
| R: "101.0.1.0/32", | ||
| Belongs: true, | ||
| }, | ||
| } | ||
| for _, g := range grid { | ||
| _, l, err := net.ParseCIDR(g.L) | ||
| if err != nil { | ||
| t.Fatalf("error parsing %q: %v", g.L, err) | ||
| } | ||
| _, r, err := net.ParseCIDR(g.R) | ||
| if err != nil { | ||
| t.Fatalf("error parsing %q: %v", g.R, err) | ||
| } | ||
| actual := BelongsTo(l, r) | ||
| if actual != g.Belongs { | ||
| t.Errorf("isSubnet(%q, %q) = %v, expected %v", g.L, g.R, actual, g.Belongs) | ||
| } | ||
| } | ||
| } | ||
|
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| func Test_SplitInto8(t *testing.T) { | ||
| tests := []struct { | ||
| parent string | ||
| expected []string | ||
| }{ | ||
| { | ||
| parent: "1.2.3.0/24", | ||
| expected: []string{"1.2.3.0/27", "1.2.3.32/27", "1.2.3.64/27", "1.2.3.96/27", "1.2.3.128/27", "1.2.3.160/27", "1.2.3.192/27", "1.2.3.224/27"}, | ||
| }, | ||
| { | ||
| parent: "1.2.3.0/27", | ||
| expected: []string{"1.2.3.0/30", "1.2.3.4/30", "1.2.3.8/30", "1.2.3.12/30", "1.2.3.16/30", "1.2.3.20/30", "1.2.3.24/30", "1.2.3.28/30"}, | ||
| }, | ||
| } | ||
| for _, test := range tests { | ||
| _, parent, err := net.ParseCIDR(test.parent) | ||
| if err != nil { | ||
| t.Fatalf("error parsing parent cidr %q: %v", test.parent, err) | ||
| } | ||
|
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| subnets, err := SplitInto8(parent) | ||
| if err != nil { | ||
| t.Fatalf("error splitting parent cidr %q: %v", parent, err) | ||
| } | ||
|
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| var actual []string | ||
| for _, subnet := range subnets { | ||
| actual = append(actual, subnet.String()) | ||
| } | ||
| if !reflect.DeepEqual(actual, test.expected) { | ||
| t.Fatalf("unexpected result of split: actual=%v, expected=%v", actual, test.expected) | ||
| } | ||
| } | ||
| } |
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