ipam

package
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 Go to latest Published: Apr 10, 2023 License: Apache-2.0, Apache-2.0 Imports: 25 Imported by: 0

Documentation

Overview

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.

Index

Constants

View Source 
const (

	// Common attributes which may be set on allocations by clients.  Moved to the model package so they can be used
	// by the AllocationBlock code too.
	AttributePod             = model.IPAMBlockAttributePod
	AttributeNamespace       = model.IPAMBlockAttributeNamespace
	AttributeNode            = model.IPAMBlockAttributeNode
	AttributeTimestamp       = model.IPAMBlockAttributeTimestamp
	AttributeType            = model.IPAMBlockAttributeType
	AttributeTypeIPIP        = model.IPAMBlockAttributeTypeIPIP
	AttributeTypeVXLAN       = model.IPAMBlockAttributeTypeVXLAN
	AttributeTypeVXLANV6     = model.IPAMBlockAttributeTypeVXLANV6
	AttributeTypeWireguard   = model.IPAMBlockAttributeTypeWireguard
	AttributeTypeWireguardV6 = model.IPAMBlockAttributeTypeWireguardV6
)
View Source 
const WindowsReservedHandle = "windows-reserved-ipam-handle"

windwowsReservedHandle is the handle used to reserve addresses required for Windows networking so that workloads do not get assigned these addresses.

Variables

View Source 
var (
	ErrBlockLimit      = errors.New("cannot allocate new block due to per host block limit")
	ErrNoQualifiedPool = errors.New("cannot find a qualified ippool")
	ErrStrictAffinity  = errors.New("global strict affinity should not be false for Windows node")
)
View Source 
var ErrUseRequired = errors.New("must specify the intended use when assigning an IP")

Functions

func SelectsNode 

func SelectsNode(pool v3.IPPool, n libapiv3.Node) (bool, error)

SelectsNode determines whether or not the IPPool's nodeSelector matches the labels on the given node.

Types

type AssignIPArgs 

type AssignIPArgs struct {
	// The IP address to assign.
	IP cnet.IP

	// If specified, a handle which can be used to retrieve / release
	// the allocated IP addresses in the future.
	HandleID *string

	// A key/value mapping of metadata to store with the allocations.
	Attrs map[string]string

	// If specified, the hostname of the host on which IP addresses
	// will be allocated.  If not specified, this will default
	// to the value provided by os.Hostname.
	Hostname string

	// If specified, the attributes of reserved IPv4 addresses in the block.
	HostReservedAttr *HostReservedAttr
}

AssignIPArgs defines the set of arguments for assigning a specific IP address.

type AutoAssignArgs 

type AutoAssignArgs struct {
	// The number of IPv4 addresses to automatically assign.
	Num4 int

	// The number of IPv6 addresses to automatically assign.
	Num6 int

	// If specified, a handle which can be used to retrieve / release
	// the allocated IP addresses in the future.
	HandleID *string

	// A key/value mapping of metadata to store with the allocations.
	Attrs map[string]string

	// If specified, the hostname of the host on which IP addresses
	// will be allocated.  If not specified, this will default
	// to the value provided by os.Hostname.
	Hostname string

	// If specified, the previously configured IPv4 pools from which
	// to assign IPv4 addresses.  If not specified, this defaults to all IPv4 pools.
	IPv4Pools []cnet.IPNet

	// If specified, the previously configured IPv6 pools from which
	// to assign IPv6 addresses.  If not specified, this defaults to all IPv6 pools.
	IPv6Pools []cnet.IPNet

	// If non-zero, limit on the number of affine blocks this host is allowed to claim
	// (per IP version).
	MaxBlocksPerHost int

	// If specified, the attributes of reserved IPv4 addresses in the block.
	HostReservedAttrIPv4s *HostReservedAttr

	// If specified, the attributes of reserved IPv6 addresses in the block.
	HostReservedAttrIPv6s *HostReservedAttr

	// The intended use for the IP address.  Used to filter the available IP pools on their AllowedUses field.
	// This field is required.
	IntendedUse v3.IPPoolAllowedUse
}

AutoAssignArgs defines the set of arguments for assigning one or more IP addresses.

type BlockArgs 

type BlockArgs struct {
	// If specified, the hostname of the host on which blocks
	// will be allocated.  If not specified, this will default
	// to the value provided by os.Hostname.
	Hostname string

	// If specified, the previously configured IPv4 pools from which
	// to assign IPv4 addresses.  If not specified, this defaults to all IPv4 pools.
	IPv4Pools []cnet.IPNet

	// If specified, the previously configured IPv6 pools from which
	// to assign IPv6 addresses.  If not specified, this defaults to all IPv6 pools.
	IPv6Pools []cnet.IPNet

	// If specified, the attributes of reserved IPv4 addresses in this block.
	HostReservedAttrIPv4s *HostReservedAttr

	// If specified, the attributes of reserved IPv6 addresses in this block.
	HostReservedAttrIPv6s *HostReservedAttr
}

BlockArgs defines the set of arguments for allocating one block.

type BlockUtilization 

type BlockUtilization struct {
	// This block's CIDR.
	CIDR net.IPNet

	// Number of possible IPs in this block.
	Capacity int

	// Number of available IPs in this block.
	Available int
}

BlockUtilization reports IP utilization for a single allocation block.

type GetUtilizationArgs 

type GetUtilizationArgs struct {
	// If specified, the pools whose utilization should be reported.  Each string here
	// can be a pool name or CIDR.  If not specified, this defaults to all pools.
	Pools []string
}

GetUtilizationArgs defines the set of arguments for requesting IP utilization.

type HostReservedAttr 

type HostReservedAttr struct {
	// Number of addresses reserved from start of the block.
	StartOfBlock int

	// Number of addresses reserved from end of the block.
	EndOfBlock int

	// Handle for reserved addresses.
	Handle string

	// A description about the reserves.
	Note string
}

type IPAMAssignments 

type IPAMAssignments struct {
	IPs              []net.IPNet       // assigned IP addresses
	IPVersion        int               // IP version (4 or 6)
	NumRequested     int               // number of requested IP addresses (not all may be assigned)
	HostReservedAttr *HostReservedAttr // reserved addresses at start and/or end of blocks
	Msgs             []string          // warning/error messages to be rendered in case there are any issues with the assignment
}

func (*IPAMAssignments) AddMsg 

func (i *IPAMAssignments) AddMsg(msg string)

func (*IPAMAssignments) PartialFulfillmentError 

func (i *IPAMAssignments) PartialFulfillmentError() error

type IPAMConfig 

type IPAMConfig struct {
	// When StrictAffinity is true, addresses from a given block can only be
	// assigned by hosts with the blocks affinity.  If false, then AutoAllocateBlocks
	// must be true.  The default value is false.
	StrictAffinity bool

	// When AutoAllocateBlocks is true, Calico will automatically
	// allocate blocks of IP address to hosts as needed to assign addresses.
	// If false, then StrictAffinity must be true.  The default value is true.
	AutoAllocateBlocks bool

	// If non-zero, MaxBlocksPerHost specifies the max number of blocks that may
	// be affine to a node.
	MaxBlocksPerHost int
}

IPAMConfig contains global configuration options for Calico IPAM. This IPAM configuration is stored in the datastore and configures the behavior of Calico IPAM across an entire Calico cluster.

type IPReservationInterface 

type IPReservationInterface interface {
	List(ctx context.Context, opts options.ListOptions) (*v3.IPReservationList, error)
}

IPReservationInterface is the subset of clientv3.IPReservationInterface that we need.

type Interface 

type Interface interface {
	// AssignIP assigns the provided IP address to the provided host.  The IP address
	// must fall within a configured pool.  AssignIP will claim block affinity as needed
	// in order to satisfy the assignment.  An error will be returned if the IP address
	// is already assigned, or if StrictAffinity is enabled and the address is within
	// a block that does not have affinity for the given host.
	AssignIP(ctx context.Context, args AssignIPArgs) error

	// AutoAssign automatically assigns one or more IP addresses as specified by the
	// provided AutoAssignArgs.  AutoAssign returns the list of the assigned IPv4 addresses,
	// and the list of the assigned IPv6 addresses in IPNet format.
	// The returned IPNet represents the allocation block from which the IP was allocated,
	// which is useful for dataplanes that need to know the subnet (such as Windows).
	//
	// In case of error, returns the IPs allocated so far along with the error.
	AutoAssign(ctx context.Context, args AutoAssignArgs) (*IPAMAssignments, *IPAMAssignments, error)

	// ReleaseIPs releases any of the given IP addresses that are currently assigned,
	// so that they are available to be used in another assignment.
	ReleaseIPs(ctx context.Context, ips ...ReleaseOptions) ([]cnet.IP, error)

	// GetAssignmentAttributes returns the attributes stored with the given IP address
	// upon assignment, as well as the handle used for assignment (if any).
	GetAssignmentAttributes(ctx context.Context, addr cnet.IP) (map[string]string, *string, error)

	// IPsByHandle returns a list of all IP addresses that have been
	// assigned using the provided handle.
	IPsByHandle(ctx context.Context, handleID string) ([]cnet.IP, error)

	// ReleaseByHandle releases all IP addresses that have been assigned
	// using the provided handle.  Returns an error if no addresses
	// are assigned with the given handle.
	ReleaseByHandle(ctx context.Context, handleID string) error

	// ClaimAffinity claims affinity to the given host for all blocks
	// within the given CIDR.  The given CIDR must fall within a configured
	// pool. If an empty string is passed as the host, then the value returned by os.Hostname is used.
	ClaimAffinity(ctx context.Context, cidr cnet.IPNet, host string) ([]cnet.IPNet, []cnet.IPNet, error)

	// ReleaseAffinity releases affinity for all blocks within the given CIDR
	// on the given host.  If an empty string is passed as the host, then the
	// value returned by os.Hostname will be used. If mustBeEmpty is true, then an error
	// will be returned if any blocks within the CIDR are not empty - in this case, this
	// function may release some but not all blocks within the given CIDR.
	ReleaseAffinity(ctx context.Context, cidr cnet.IPNet, host string, mustBeEmpty bool) error

	// ReleaseHostAffinities releases affinity for all blocks that are affine
	// to the given host.  If an empty string is passed as the host, the value returned by
	// os.Hostname will be used. If mustBeEmpty is true, then an error
	// will be returned if any blocks within the CIDR are not empty - in this case, this
	// function may release some but not all blocks attached to this host.
	ReleaseHostAffinities(ctx context.Context, host string, mustBeEmpty bool) error

	// ReleasePoolAffinities releases affinity for all blocks within
	// the specified pool across all hosts.
	ReleasePoolAffinities(ctx context.Context, pool cnet.IPNet) error

	// ReleaseBlockAffinity releases the affinity of the exact block provided.
	ReleaseBlockAffinity(ctx context.Context, block *model.AllocationBlock, mustBeEmpty bool) error

	// GetIPAMConfig returns the global IPAM configuration.  If no IPAM configuration
	// has been set, returns a default configuration with StrictAffinity disabled
	// and AutoAllocateBlocks enabled.
	GetIPAMConfig(ctx context.Context) (*IPAMConfig, error)

	// SetIPAMConfig sets global IPAM configuration.  This can only
	// be done when there are no allocated blocks and IP addresses.
	SetIPAMConfig(ctx context.Context, cfg IPAMConfig) error

	// RemoveIPAMHost releases affinity for all blocks on the given host,
	// and removes all host-specific IPAM data from the datastore.
	// RemoveIPAMHost does not release any IP addresses claimed on the given host.
	// If an empty string is passed as the host then the value returned by os.Hostname is used.
	RemoveIPAMHost(ctx context.Context, host string) error

	// GetUtilization returns IP utilization info for the specified pools, or for all pools.
	GetUtilization(ctx context.Context, args GetUtilizationArgs) ([]*PoolUtilization, error)

	// EnsureBlock returns single IPv4/IPv6 IPAM block for a host as specified by the provided BlockArgs.
	// If there is no block allocated already for this host, allocate one and return its' CIDR.
	// Otherwise, return the CIDR of the IPAM block allocated for this host.
	// It returns IPv4, IPv6 block CIDR and any error encountered.
	EnsureBlock(ctx context.Context, args BlockArgs) (*cnet.IPNet, *cnet.IPNet, error)
}

ipam.Interface has methods to perform IP address management.

func NewIPAMClient 

func NewIPAMClient(client bapi.Client, pools PoolAccessorInterface, reservations IPReservationInterface) Interface

NewIPAMClient returns a new ipamClient, which implements Interface. Consumers of the Calico API should not create this directly, but should access IPAM through the main client IPAM accessor (e.g. clientv3.IPAM())

type PoolAccessorInterface 

type PoolAccessorInterface interface {
	// Returns a list of enabled pools sorted in alphanumeric name order.
	GetEnabledPools(ipVersion int) ([]v3.IPPool, error)
	// Returns a list of all pools sorted in alphanumeric name order.
	GetAllPools() ([]v3.IPPool, error)
}

Interface used to access the enabled IPPools.

type PoolUtilization 

type PoolUtilization struct {
	// This pool's name.
	Name string

	// This pool's CIDR.
	CIDR net.IPNet

	// Utilization for each of this pool's blocks.
	Blocks []BlockUtilization
}

PoolUtilization reports IP utilization for a single IP pool.

type ReleaseOptions 

type ReleaseOptions struct {
	// Address to release.
	Address string

	// If provided, handle and sequence number will be used to
	// check for race conditions with other users of the IPAM API. It is
	// highly recommended that both values be set on release requests.
	Handle         string
	SequenceNumber *uint64
}

func (*ReleaseOptions) AsNetIP 

func (opts *ReleaseOptions) AsNetIP() (*cnet.IP, error)

Source Files

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