k8s.io/apiserver@v0.31.1/pkg/endpoints/discovery/addresses.go (about)

     1  /*
     2  Copyright 2016 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 discovery
    18  
    19  import (
    20  	"net"
    21  
    22  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    23  )
    24  
    25  type Addresses interface {
    26  	ServerAddressByClientCIDRs(net.IP) []metav1.ServerAddressByClientCIDR
    27  }
    28  
    29  // DefaultAddresses is a default implementation of Addresses that will work in most cases
    30  type DefaultAddresses struct {
    31  	// CIDRRules is a list of CIDRs and Addresses to use if a client is in the range
    32  	CIDRRules []CIDRRule
    33  
    34  	// DefaultAddress is the address (hostname or IP and port) that should be used in
    35  	// if no CIDR matches more specifically.
    36  	DefaultAddress string
    37  }
    38  
    39  // CIDRRule is a rule for adding an alternate path to the master based on matching CIDR
    40  type CIDRRule struct {
    41  	IPRange net.IPNet
    42  
    43  	// Address is the address (hostname or IP and port) that should be used in
    44  	// if this CIDR matches
    45  	Address string
    46  }
    47  
    48  func (d DefaultAddresses) ServerAddressByClientCIDRs(clientIP net.IP) []metav1.ServerAddressByClientCIDR {
    49  	addressCIDRMap := []metav1.ServerAddressByClientCIDR{
    50  		{
    51  			ClientCIDR:    "0.0.0.0/0",
    52  			ServerAddress: d.DefaultAddress,
    53  		},
    54  	}
    55  
    56  	for _, rule := range d.CIDRRules {
    57  		addressCIDRMap = append(addressCIDRMap, rule.ServerAddressByClientCIDRs(clientIP)...)
    58  	}
    59  	return addressCIDRMap
    60  }
    61  
    62  func (d CIDRRule) ServerAddressByClientCIDRs(clientIP net.IP) []metav1.ServerAddressByClientCIDR {
    63  	addressCIDRMap := []metav1.ServerAddressByClientCIDR{}
    64  
    65  	if d.IPRange.Contains(clientIP) {
    66  		addressCIDRMap = append(addressCIDRMap, metav1.ServerAddressByClientCIDR{
    67  			ClientCIDR:    d.IPRange.String(),
    68  			ServerAddress: d.Address,
    69  		})
    70  	}
    71  	return addressCIDRMap
    72  }