fake.go

Documentation: k8s.io/kubernetes/pkg/proxy/conntrack

     1  //go:build linux
     2  // +build linux
     3  
     4  /*
     5  Copyright 2016 The Kubernetes Authors.
     6  
     7  Licensed under the Apache License, Version 2.0 (the "License");
     8  you may not use this file except in compliance with the License.
     9  You may obtain a copy of the License at
    10  
    11      http://www.apache.org/licenses/LICENSE-2.0
    12  
    13  Unless required by applicable law or agreed to in writing, software
    14  distributed under the License is distributed on an "AS IS" BASIS,
    15  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16  See the License for the specific language governing permissions and
    17  limitations under the License.
    18  */
    19  
    20  package conntrack
    21  
    22  import (
    23  	"fmt"
    24  
    25  	v1 "k8s.io/api/core/v1"
    26  	"k8s.io/apimachinery/pkg/util/sets"
    27  )
    28  
    29  // FakeInterface implements Interface by just recording entries that have been cleared.
    30  type FakeInterface struct {
    31  	ClearedIPs      sets.Set[string]
    32  	ClearedPorts    sets.Set[int]
    33  	ClearedNATs     map[string]string // origin -> dest
    34  	ClearedPortNATs map[int]string    // port -> dest
    35  }
    36  
    37  var _ Interface = &FakeInterface{}
    38  
    39  // NewFake creates a new FakeInterface
    40  func NewFake() *FakeInterface {
    41  	fake := &FakeInterface{}
    42  	fake.Reset()
    43  	return fake
    44  }
    45  
    46  // Reset clears fake's sets/maps
    47  func (fake *FakeInterface) Reset() {
    48  	fake.ClearedIPs = sets.New[string]()
    49  	fake.ClearedPorts = sets.New[int]()
    50  	fake.ClearedNATs = make(map[string]string)
    51  	fake.ClearedPortNATs = make(map[int]string)
    52  }
    53  
    54  // ClearEntriesForIP is part of Interface
    55  func (fake *FakeInterface) ClearEntriesForIP(ip string, protocol v1.Protocol) error {
    56  	if protocol != v1.ProtocolUDP {
    57  		return fmt.Errorf("FakeInterface currently only supports UDP")
    58  	}
    59  
    60  	fake.ClearedIPs.Insert(ip)
    61  	return nil
    62  }
    63  
    64  // ClearEntriesForPort is part of Interface
    65  func (fake *FakeInterface) ClearEntriesForPort(port int, isIPv6 bool, protocol v1.Protocol) error {
    66  	if protocol != v1.ProtocolUDP {
    67  		return fmt.Errorf("FakeInterface currently only supports UDP")
    68  	}
    69  
    70  	fake.ClearedPorts.Insert(port)
    71  	return nil
    72  }
    73  
    74  // ClearEntriesForNAT is part of Interface
    75  func (fake *FakeInterface) ClearEntriesForNAT(origin, dest string, protocol v1.Protocol) error {
    76  	if protocol != v1.ProtocolUDP {
    77  		return fmt.Errorf("FakeInterface currently only supports UDP")
    78  	}
    79  	if previous, exists := fake.ClearedNATs[origin]; exists && previous != dest {
    80  		return fmt.Errorf("ClearEntriesForNAT called with same origin (%s), different destination (%s / %s)", origin, previous, dest)
    81  	}
    82  
    83  	fake.ClearedNATs[origin] = dest
    84  	return nil
    85  }
    86  
    87  // ClearEntriesForPortNAT is part of Interface
    88  func (fake *FakeInterface) ClearEntriesForPortNAT(dest string, port int, protocol v1.Protocol) error {
    89  	if protocol != v1.ProtocolUDP {
    90  		return fmt.Errorf("FakeInterface currently only supports UDP")
    91  	}
    92  	if previous, exists := fake.ClearedPortNATs[port]; exists && previous != dest {
    93  		return fmt.Errorf("ClearEntriesForPortNAT called with same port (%d), different destination (%s / %s)", port, previous, dest)
    94  	}
    95  
    96  	fake.ClearedPortNATs[port] = dest
    97  	return nil
    98  }
    99
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