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ipam.go
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ipam.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 (
"net"
"github.com/cilium/cilium/pkg/cidr"
"github.com/cilium/cilium/pkg/datapath"
ipamOption "github.com/cilium/cilium/pkg/ipam/option"
"github.com/cilium/cilium/pkg/logging"
"github.com/cilium/cilium/pkg/logging/logfields"
"github.com/sirupsen/logrus"
)
var (
log = logging.DefaultLogger.WithField(logfields.LogSubsys, "ipam")
)
type ErrAllocation error
// Family is the type describing all address families support by the IP
// allocation manager
type Family string
const (
IPv6 Family = "ipv6"
IPv4 Family = "ipv4"
)
// DeriveFamily derives the address family of an IP
func DeriveFamily(ip net.IP) Family {
if ip.To4() == nil {
return IPv6
}
return IPv4
}
// Configuration is the configuration passed into the IPAM subsystem
type Configuration interface {
// IPv4Enabled must return true when IPv4 is enabled
IPv4Enabled() bool
// IPv6 must return true when IPv6 is enabled
IPv6Enabled() bool
// IPAMMode returns the IPAM mode
IPAMMode() string
// HealthCheckingEnabled must return true when health-checking is
// enabled
HealthCheckingEnabled() bool
// BlacklistConflictingRoutesEnabled must return true when blacklisting
// of conflicting IPs is enabled
BlacklistConflictingRoutesEnabled() bool
// SetIPv4NativeRoutingCIDR is called by the IPAM module to announce
// the native IPv4 routing CIDR if it exists
SetIPv4NativeRoutingCIDR(cidr *cidr.CIDR)
// IPv4NativeRoutingCIDR is called by the IPAM module retrieve
// the native IPv4 routing CIDR if it exists
IPv4NativeRoutingCIDR() *cidr.CIDR
}
// Owner is the interface the owner of an IPAM allocator has to implement
type Owner interface {
// UpdateCiliumNodeResource is called to create/update the CiliumNode
// resource. The function must block until the custom resource has been
// created.
UpdateCiliumNodeResource()
}
type K8sEventRegister interface {
// K8sEventReceived is called to do metrics accounting for received
// Kubernetes events
K8sEventReceived(scope string, action string, valid, equal bool)
// K8sEventProcessed is called to do metrics accounting for each processed
// Kubernetes event
K8sEventProcessed(scope string, action string, status bool)
}
// NewIPAM returns a new IP address manager
func NewIPAM(nodeAddressing datapath.NodeAddressing, c Configuration, owner Owner, k8sEventReg K8sEventRegister) *IPAM {
ipam := &IPAM{
nodeAddressing: nodeAddressing,
config: c,
owner: map[string]string{},
expirationTimers: map[string]string{},
blacklist: IPBlacklist{
ips: map[string]string{},
},
}
switch c.IPAMMode() {
case ipamOption.IPAMHostScopeLegacy, ipamOption.IPAMKubernetes, ipamOption.IPAMClusterPool:
log.WithFields(logrus.Fields{
logfields.V4Prefix: nodeAddressing.IPv4().AllocationCIDR(),
logfields.V6Prefix: nodeAddressing.IPv6().AllocationCIDR(),
}).Infof("Initializing %s IPAM", c.IPAMMode())
if c.IPv6Enabled() {
ipam.IPv6Allocator = newHostScopeAllocator(nodeAddressing.IPv6().AllocationCIDR().IPNet)
}
if c.IPv4Enabled() {
ipam.IPv4Allocator = newHostScopeAllocator(nodeAddressing.IPv4().AllocationCIDR().IPNet)
}
case ipamOption.IPAMCRD, ipamOption.IPAMENI, ipamOption.IPAMAzure:
log.Info("Initializing CRD-based IPAM")
if c.IPv6Enabled() {
ipam.IPv6Allocator = newCRDAllocator(IPv6, c, owner, k8sEventReg)
}
if c.IPv4Enabled() {
ipam.IPv4Allocator = newCRDAllocator(IPv4, c, owner, k8sEventReg)
}
default:
log.Fatalf("Unknown IPAM backend %s", c.IPAMMode())
}
return ipam
}
func nextIP(ip net.IP) {
for j := len(ip) - 1; j >= 0; j-- {
ip[j]++
if ip[j] > 0 {
break
}
}
}
// ReserveLocalRoutes walks through local routes/subnets and reserves them in
// the allocator pool in case of overlap
func (ipam *IPAM) ReserveLocalRoutes() {
if !ipam.config.BlacklistConflictingRoutesEnabled() {
return
}
if ipam.IPv4Allocator != nil {
ipam.reserveLocalRoutes()
}
}
// BlacklistIP ensures that a certain IP is never allocated. It is preferred to
// use BlacklistIP() instead of allocating the IP as the allocation block can
// change and suddenly cover the IP to be blacklisted.
func (ipam *IPAM) BlacklistIP(ip net.IP, owner string) {
ipam.allocatorMutex.Lock()
ipam.blacklist.ips[ip.String()] = owner
ipam.allocatorMutex.Unlock()
}
// BlacklistIPNet ensures that a certain IPNetwork is never allocated, similar
// to BlacklistIP.
func (ipam *IPAM) BlacklistIPNet(ipNet net.IPNet, owner string) {
ipam.allocatorMutex.Lock()
ipam.blacklist.ipNets = append(ipam.blacklist.ipNets, &IPNetWithOwner{
ipNet: ipNet,
owner: owner,
})
ipam.allocatorMutex.Unlock()
}