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ipam.go
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ipam.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package ipam
import (
"net"
"github.com/sirupsen/logrus"
"github.com/cilium/cilium/pkg/cidr"
"github.com/cilium/cilium/pkg/datapath/types"
ipamOption "github.com/cilium/cilium/pkg/ipam/option"
"github.com/cilium/cilium/pkg/k8s/watchers/subscriber"
"github.com/cilium/cilium/pkg/logging"
"github.com/cilium/cilium/pkg/logging/logfields"
)
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
// UnreachableRoutesEnabled returns true when unreachable-routes is
// enabled
UnreachableRoutesEnabled() 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
GetIPv4NativeRoutingCIDR() *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()
// LocalAllocCIDRsUpdated informs the agent that the local allocation CIDRs have
// changed.
LocalAllocCIDRsUpdated(ipv4AllocCIDRs, ipv6AllocCIDRs []*cidr.CIDR)
}
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)
// RegisterCiliumNodeSubscriber allows registration of subscriber.CiliumNode
// implementations. Events for all CiliumNode events (not just the local one)
// will be sent to the subscriber.
RegisterCiliumNodeSubscriber(s subscriber.CiliumNode)
}
type MtuConfiguration interface {
GetDeviceMTU() int
}
// NewIPAM returns a new IP address manager
func NewIPAM(nodeAddressing types.NodeAddressing, c Configuration, owner Owner, k8sEventReg K8sEventRegister, mtuConfig MtuConfiguration) *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.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.IPAMClusterPoolV2:
log.Info("Initializing ClusterPool v2 IPAM")
if c.IPv6Enabled() {
ipam.IPv6Allocator = newClusterPoolAllocator(IPv6, c, owner, k8sEventReg)
}
if c.IPv4Enabled() {
ipam.IPv4Allocator = newClusterPoolAllocator(IPv4, c, owner, k8sEventReg)
}
case ipamOption.IPAMCRD, ipamOption.IPAMENI, ipamOption.IPAMAzure, ipamOption.IPAMAlibabaCloud:
log.Info("Initializing CRD-based IPAM")
if c.IPv6Enabled() {
ipam.IPv6Allocator = newCRDAllocator(IPv6, c, owner, k8sEventReg, mtuConfig)
}
if c.IPv4Enabled() {
ipam.IPv4Allocator = newCRDAllocator(IPv4, c, owner, k8sEventReg, mtuConfig)
}
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
}
}
}
// 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()
}