k8s.io/kubernetes@v1.29.3/pkg/controller/nodeipam/ipam/controller_test.go (about)

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package ipam
    18  
    19  import (
    20  	"net"
    21  	"testing"
    22  
    23  	"k8s.io/kubernetes/pkg/controller/nodeipam/ipam/cidrset"
    24  	"k8s.io/kubernetes/pkg/controller/nodeipam/ipam/test"
    25  )
    26  
    27  func TestOccupyServiceCIDR(t *testing.T) {
    28  	const clusterCIDR = "10.1.0.0/16"
    29  
    30  TestCase:
    31  	for _, tc := range []struct {
    32  		serviceCIDR string
    33  	}{
    34  		{"10.0.255.0/24"},
    35  		{"10.1.0.0/24"},
    36  		{"10.1.255.0/24"},
    37  		{"10.2.0.0/24"},
    38  	} {
    39  		serviceCIDR := test.MustParseCIDR(tc.serviceCIDR)
    40  		set, err := cidrset.NewCIDRSet(test.MustParseCIDR(clusterCIDR), 24)
    41  		if err != nil {
    42  			t.Errorf("test case %+v: NewCIDRSet() = %v, want nil", tc, err)
    43  		}
    44  		if err := occupyServiceCIDR(set, test.MustParseCIDR(clusterCIDR), serviceCIDR); err != nil {
    45  			t.Errorf("test case %+v: occupyServiceCIDR() = %v, want nil", tc, err)
    46  		}
    47  		// Allocate until full.
    48  		var cidrs []*net.IPNet
    49  		for {
    50  			cidr, err := set.AllocateNext()
    51  			if err != nil {
    52  				if err == cidrset.ErrCIDRRangeNoCIDRsRemaining {
    53  					break
    54  				}
    55  				t.Errorf("set.AllocateNext() = %v, want %v", err, cidrset.ErrCIDRRangeNoCIDRsRemaining)
    56  				continue TestCase
    57  			}
    58  			cidrs = append(cidrs, cidr)
    59  		}
    60  		// No allocated CIDR range should intersect with serviceCIDR.
    61  		for _, c := range cidrs {
    62  			if c.Contains(serviceCIDR.IP) || serviceCIDR.Contains(c.IP) {
    63  				t.Errorf("test case %+v: allocated CIDR %v from service range", tc, c)
    64  			}
    65  		}
    66  	}
    67  }