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hostscope.go
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hostscope.go
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// Copyright 2017-2020 Authors of Cilium
//
// 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 ipam
import (
"fmt"
"math/big"
"net"
"github.com/cilium/cilium/pkg/ip"
"github.com/cilium/ipam/service/ipallocator"
)
type hostScopeAllocator struct {
allocCIDR *net.IPNet
allocator *ipallocator.Range
}
func newHostScopeAllocator(n *net.IPNet) Allocator {
cidrRange, err := ipallocator.NewCIDRRange(n)
if err != nil {
panic(err)
}
a := &hostScopeAllocator{
allocCIDR: n,
allocator: cidrRange,
}
return a
}
func (h *hostScopeAllocator) Allocate(ip net.IP, owner string) (*AllocationResult, error) {
if err := h.allocator.Allocate(ip); err != nil {
return nil, err
}
return &AllocationResult{IP: ip}, nil
}
func (h *hostScopeAllocator) AllocateWithoutSyncUpstream(ip net.IP, owner string) (*AllocationResult, error) {
if err := h.allocator.Allocate(ip); err != nil {
return nil, err
}
return &AllocationResult{IP: ip}, nil
}
func (h *hostScopeAllocator) Release(ip net.IP) error {
return h.allocator.Release(ip)
}
func (h *hostScopeAllocator) AllocateNext(owner string) (*AllocationResult, error) {
ip, err := h.allocator.AllocateNext()
if err != nil {
return nil, err
}
return &AllocationResult{IP: ip}, nil
}
func (h *hostScopeAllocator) AllocateNextWithoutSyncUpstream(owner string) (*AllocationResult, error) {
ip, err := h.allocator.AllocateNext()
if err != nil {
return nil, err
}
return &AllocationResult{IP: ip}, nil
}
func (h *hostScopeAllocator) Dump() (map[string]string, string) {
var origIP *big.Int
alloc := map[string]string{}
_, data, err := h.allocator.Snapshot()
if err != nil {
return nil, "Unable to get a snapshot of the allocator"
}
if h.allocCIDR.IP.To4() != nil {
origIP = big.NewInt(0).SetBytes(h.allocCIDR.IP.To4())
} else {
origIP = big.NewInt(0).SetBytes(h.allocCIDR.IP.To16())
}
bits := big.NewInt(0).SetBytes(data)
for i := 0; i < bits.BitLen(); i++ {
if bits.Bit(i) != 0 {
ip := net.IP(big.NewInt(0).Add(origIP, big.NewInt(int64(uint(i+1)))).Bytes()).String()
alloc[ip] = ""
}
}
maxIPs := ip.CountIPsInCIDR(h.allocCIDR)
status := fmt.Sprintf("%d/%s allocated from %s", len(alloc), maxIPs.String(), h.allocCIDR.String())
return alloc, status
}
// RestoreFinished marks the status of restoration as done
func (h *hostScopeAllocator) RestoreFinished() {}