github.com/imran-kn/cilium-fork@v1.6.9/pkg/ipam/hostscope.go (about)

     1  // Copyright 2017-2019 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ipam
    16  
    17  import (
    18  	"fmt"
    19  	"math/big"
    20  	"net"
    21  
    22  	"github.com/cilium/cilium/pkg/ip"
    23  
    24  	k8sAPI "k8s.io/kubernetes/pkg/apis/core"
    25  	"k8s.io/kubernetes/pkg/registry/core/service/ipallocator"
    26  )
    27  
    28  type hostScopeAllocator struct {
    29  	allocCIDR *net.IPNet
    30  	allocator *ipallocator.Range
    31  }
    32  
    33  func newHostScopeAllocator(n *net.IPNet) Allocator {
    34  	cidrRange, err := ipallocator.NewCIDRRange(n)
    35  	if err != nil {
    36  		panic(err)
    37  	}
    38  	a := &hostScopeAllocator{
    39  		allocCIDR: n,
    40  		allocator: cidrRange,
    41  	}
    42  
    43  	return a
    44  }
    45  
    46  func (h *hostScopeAllocator) Allocate(ip net.IP, owner string) (*AllocationResult, error) {
    47  	if err := h.allocator.Allocate(ip); err != nil {
    48  		return nil, err
    49  	}
    50  
    51  	return &AllocationResult{IP: ip}, nil
    52  }
    53  
    54  func (h *hostScopeAllocator) Release(ip net.IP) error {
    55  	return h.allocator.Release(ip)
    56  }
    57  
    58  func (h *hostScopeAllocator) AllocateNext(owner string) (*AllocationResult, error) {
    59  	ip, err := h.allocator.AllocateNext()
    60  	if err != nil {
    61  		return nil, err
    62  	}
    63  
    64  	return &AllocationResult{IP: ip}, nil
    65  }
    66  
    67  func (h *hostScopeAllocator) Dump() (map[string]string, string) {
    68  	var origIP *big.Int
    69  	alloc := map[string]string{}
    70  	ral := k8sAPI.RangeAllocation{}
    71  	h.allocator.Snapshot(&ral)
    72  	if h.allocCIDR.IP.To4() != nil {
    73  		origIP = big.NewInt(0).SetBytes(h.allocCIDR.IP.To4())
    74  	} else {
    75  		origIP = big.NewInt(0).SetBytes(h.allocCIDR.IP.To16())
    76  	}
    77  	bits := big.NewInt(0).SetBytes(ral.Data)
    78  	for i := 0; i < bits.BitLen(); i++ {
    79  		if bits.Bit(i) != 0 {
    80  			ip := net.IP(big.NewInt(0).Add(origIP, big.NewInt(int64(uint(i+1)))).Bytes()).String()
    81  			alloc[ip] = ""
    82  		}
    83  	}
    84  
    85  	maxIPs := ip.CountIPsInCIDR(h.allocCIDR)
    86  	status := fmt.Sprintf("%d/%d allocated from %s", len(alloc), maxIPs, h.allocCIDR.String())
    87  
    88  	return alloc, status
    89  }