ipam

package
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 Go to latest Published: May 17, 2019 License: Apache-2.0 Imports: 23 Imported by: 0

Documentation

Overview

Package ipam provides node-local IPAM calculations: POD IP addresses, VPP-host interconnect, node interconnect IP addresses and SRv6 SIDs.

The configuration for IPAM is retrieved from the ContivConf plugin.

Single IPAM instance is responsible for all node-local allocations. Between nodes, however, IPAMs do not communicate with each other, instead, the unique node ID (uint32), retrieved from the nodesync plugin upon the first resync, is used to avoid inter-node collisions.

The plugin calculates and assigns the following IP addresses:

  • node-local POD network and individual POD IPs (based on podSubnetCIDR, podSubnetOneNodePrefixLen and node ID)
  • IP subnet for the VPP-to-host Linux stack interconnect (based on vppHostSubnetCIDR, vppHostSubnetOneNodePrefixLen and node ID)
  • IP address of the physical interface used for node interconnect (based on nodeInterconnectCIDR and node ID)

Example (configuration from contiv.conf processed by ContivConf plugin): 

	    ipamConfig:
		  podSubnetCIDR: "10.1.0.0/16"
		  podSubnetOneNodePrefixLen: 24
		  vppHostSubnetCIDR: "172.30.0.0/16"
		  vppHostSubnetOneNodePrefixLen: 24
		  nodeInterconnectCIDR: "192.168.16.0/24"

		Assigned node ID: 5

		Calculated POD IPs: 10.1.5.2 - 10.1.5.254 (/24)
		Calculated VPP-host interconnect IPs: 172.30.5.1, 172.30.5.2 (/24)
 	Calculated Node Interconnect IP:  192.168.16.5 (/24)

Index

Constants

This section is empty.

Variables

View Source 
var DefaultPlugin = *NewPlugin()

DefaultPlugin is a default instance of IPAM plugin.

Functions

This section is empty.

Types

type API 

type API interface {
	// NodeIPAddress computes IP address of the node based on the provided node ID.
	NodeIPAddress(nodeID uint32) (net.IP, *net.IPNet, error)

	// VxlanIPAddress computes IP address of the VXLAN interface based on the provided
	// node ID.
	VxlanIPAddress(nodeID uint32) (net.IP, *net.IPNet, error)

	// HostInterconnectIPInVPP provides the IPv4 address for the VPP-end of the VPP-to-host
	// interconnect.
	HostInterconnectIPInVPP() net.IP

	// HostInterconnectIPInLinux provides the IPv4 address of the host(Linux)-end
	// of the VPP-to-host interconnect.
	HostInterconnectIPInLinux() net.IP

	// HostInterconnectSubnetThisNode returns vswitch network used to connect
	// VPP to its host Linux Stack on this node.
	HostInterconnectSubnetThisNode() *net.IPNet

	// HostInterconnectSubnetAllNodes returns vswitch base subnet used to connect
	// VPP to its host Linux Stack on all nodes.
	HostInterconnectSubnetAllNodes() *net.IPNet

	// HostInterconnectSubnetOtherNode returns VPP-host network of another node
	// identified by nodeID.
	HostInterconnectSubnetOtherNode(nodeID uint32) (*net.IPNet, error)

	// NodeIDFromPodIP returns node ID from provided POD IP address.
	NodeIDFromPodIP(podIP net.IP) (uint32, error)

	// PodSubnetAllNodes returns POD subnet that is a base subnet for all PODs
	// of all nodes.
	PodSubnetAllNodes() *net.IPNet

	// PodSubnetThisNode returns POD network for the current node
	// (given by nodeID allocated for this node).
	PodSubnetThisNode() *net.IPNet

	// PodSubnetOtherNode returns the POD network of another node identified by nodeID.
	PodSubnetOtherNode(nodeID uint32) (*net.IPNet, error)

	// ServiceNetwork returns range allocated for services.
	ServiceNetwork() *net.IPNet

	// PodGatewayIP returns gateway IP address of the POD subnet of this node.
	PodGatewayIP() net.IP

	// NatLoopbackIP returns the IP address of a virtual loopback, used to route
	// traffic between clients and services via VPP even if the source and destination
	// are the same IP addresses and would otherwise be routed locally.
	NatLoopbackIP() net.IP

	// AllocatePodIP tries to allocate IP address for the given pod.
	AllocatePodIP(podID podmodel.ID, ipamType string, ipamData string) (net.IP, error)

	// GetPodIP returns the allocated pod IP, together with the mask.
	// Returns nil if the pod does not have allocated IP address.
	GetPodIP(podID podmodel.ID) *net.IPNet

	// AllocatePodCustomIfIP tries to allocate custom IP address for the given interface of a given pod.
	AllocatePodCustomIfIP(podID podmodel.ID, ifName, network string) (net.IP, error)

	// GetPodCustomIfIP returns the allocated custom interface pod IP, together with the mask.
	// Returns nil if the pod does not have allocated custom interface IP address.
	GetPodCustomIfIP(podID podmodel.ID, ifName, network string) *net.IPNet

	// GetPodFromIP returns the pod information related to the allocated pod IP.
	// found is false if the provided IP address has not been allocated to any local pod.
	GetPodFromIP(podIP net.IP) (podID podmodel.ID, found bool)

	// ReleasePodIPs releases all pod IP addresses making them available for new PODs.
	ReleasePodIPs(podID podmodel.ID) error

	// BsidForServicePolicy creates a valid SRv6 binding SID for given k8s service IP addresses <serviceIPs>. This sid
	// should be used only for k8s service policy
	BsidForServicePolicy(serviceIPs []net.IP) net.IP

	// SidForServiceHostLocalsid creates a valid SRv6 SID for service locasid leading to host on the current node. Created SID
	// doesn't depend on anything and is the same for each node, because there is only one way how to get to host in each
	// node and localsid have local significance (their sid don't have to be globally unique)
	SidForServiceHostLocalsid() net.IP

	// SidForServicePodLocalsid creates a valid SRv6 SID for service locasid leading to pod backend. The SID creation is
	// based on backend IP <backendIP>.
	SidForServicePodLocalsid(backendIP net.IP) net.IP

	// SidForNodeToNodePodLocalsid creates a valid SRv6 SID for locasid that is part of node-to-node Srv6 tunnel and
	// outputs packets to pod VRF table.
	SidForNodeToNodePodLocalsid(nodeIP net.IP) net.IP

	// SidForNodeToNodeHostLocalsid creates a valid SRv6 SID for locasid that is part of node-to-node Srv6 tunnel and
	// outputs packets to main VRF table.
	SidForNodeToNodeHostLocalsid(nodeIP net.IP) net.IP

	// SidForServiceNodeLocalsid creates a valid SRv6 SID for service locasid serving as intermediate step in policy segment list.
	SidForServiceNodeLocalsid(nodeIP net.IP) net.IP

	// BsidForNodeToNodePodPolicy creates a valid SRv6 SID for policy that is part of node-to-node Srv6 tunnel and routes traffic to pod VRF table
	BsidForNodeToNodePodPolicy(nodeIP net.IP) net.IP

	// BsidForNodeToNodeHostPolicy creates a valid SRv6 SID for policy that is part of node-to-node Srv6 tunnel and routes traffic to main VRF table
	BsidForNodeToNodeHostPolicy(nodeIP net.IP) net.IP

	// GetIPAMConfigForJSON returns IPAM configuration in format suitable
	// for marshalling to JSON (subnets not converted to net.IPNet + defined
	// JSON flag for every option). If contivCIDR is used it returns actual
	// dissected subnets.
	GetIPAMConfigForJSON() *config.IPAMConfig
}

API defines methods provided by IPAM for use by other plugins.

type Deps 

type Deps struct {
	infra.PluginDeps
	NodeSync     nodesync.API
	ContivConf   contivconf.API
	ServiceLabel servicelabel.ReaderAPI
	EventLoop    controller.EventLoop
	HTTPHandlers rest.HTTPHandlers
}

Deps lists dependencies of the IPAM plugin.

type IPAM 

type IPAM struct {
	Deps
	// contains filtered or unexported fields
}

IPAM plugin implements IP address allocation for Contiv.

func NewPlugin 

func NewPlugin(opts ...Option) *IPAM

NewPlugin creates a new Plugin with the provides Options

func (*IPAM) AllocatePodCustomIfIP 

func (i *IPAM) AllocatePodCustomIfIP(podID podmodel.ID, ifName, network string) (net.IP, error)

AllocatePodCustomIfIP tries to allocate custom IP address for the given interface of a given pod.

func (*IPAM) AllocatePodIP 

func (i *IPAM) AllocatePodIP(podID podmodel.ID, ipamType string, ipamData string) (net.IP, error)

AllocatePodIP tries to allocate IP address for the given pod.

func (*IPAM) BsidForNodeToNodeHostPolicy 

func (i *IPAM) BsidForNodeToNodeHostPolicy(nodeIP net.IP) net.IP

BsidForNodeToNodeHostPolicy creates a valid SRv6 SID for policy that is part of node-to-node Srv6 tunnel and routes traffic to main VRF table

func (*IPAM) BsidForNodeToNodePodPolicy 

func (i *IPAM) BsidForNodeToNodePodPolicy(nodeIP net.IP) net.IP

BsidForNodeToNodePodPolicy creates a valid SRv6 SID for policy that is part of node-to-node Srv6 tunnel and routes traffic to pod VRF table

func (*IPAM) BsidForServicePolicy 

func (i *IPAM) BsidForServicePolicy(serviceIPs []net.IP) net.IP

BsidForServicePolicy creates a valid SRv6 binding SID for given k8s service IP addresses <serviceIPs>. This sid should be used only for k8s service policy

func (*IPAM) Close 

func (i *IPAM) Close() error

Close is NOOP.

func (*IPAM) GetIPAMConfigForJSON 

func (i *IPAM) GetIPAMConfigForJSON() *config.IPAMConfig

GetIPAMConfigForJSON returns actual (contivCIDR dissected into ranges, if used) IPAM configuration

func (*IPAM) GetPodCustomIfIP 

func (i *IPAM) GetPodCustomIfIP(podID podmodel.ID, ifName, network string) *net.IPNet

GetPodCustomIfIP returns the allocated custom interface pod IP, together with the mask. Returns nil if the pod does not have allocated custom interface IP address.

func (*IPAM) GetPodFromIP 

func (i *IPAM) GetPodFromIP(podIP net.IP) (podID podmodel.ID, found bool)

GetPodFromIP returns the pod information related to the allocated pod IP. found is false if the provided IP address has not been allocated to any local pod.

func (*IPAM) GetPodIP 

func (i *IPAM) GetPodIP(podID podmodel.ID) *net.IPNet

GetPodIP returns the allocated pod IP, together with the mask. Returns nil if the pod does not have allocated IP address.

func (*IPAM) HandlesEvent 

func (i *IPAM) HandlesEvent(event controller.Event) bool

HandlesEvent selects any Resync event.

  • any Resync event
  • NodeUpdate for the current node if external IPAM is in use (may trigger PodCIDRChange)

func (*IPAM) HostInterconnectIPInLinux 

func (i *IPAM) HostInterconnectIPInLinux() net.IP

HostInterconnectIPInLinux provides the IP address of the host(Linux)-end of the VPP to host interconnect.

func (*IPAM) HostInterconnectIPInVPP 

func (i *IPAM) HostInterconnectIPInVPP() net.IP

HostInterconnectIPInVPP provides the IP address for the VPP-end of the VPP-to-host interconnect.

func (*IPAM) HostInterconnectSubnetAllNodes 

func (i *IPAM) HostInterconnectSubnetAllNodes() *net.IPNet

HostInterconnectSubnetAllNodes returns vswitch base subnet used to connect VPP to its host Linux Stack on all nodes.

func (*IPAM) HostInterconnectSubnetOtherNode 

func (i *IPAM) HostInterconnectSubnetOtherNode(nodeID uint32) (*net.IPNet, error)

HostInterconnectSubnetOtherNode returns VPP-host network of another node identified by nodeID.

func (*IPAM) HostInterconnectSubnetThisNode 

func (i *IPAM) HostInterconnectSubnetThisNode() *net.IPNet

HostInterconnectSubnetThisNode returns vswitch network used to connect VPP to its host Linux Stack on this node.

func (*IPAM) Init 

func (i *IPAM) Init() (err error)

Init initializes the REST handlers of the plugin.

func (*IPAM) NatLoopbackIP 

func (i *IPAM) NatLoopbackIP() net.IP

NatLoopbackIP returns the IP address of a virtual loopback, used to route traffic between clients and services via VPP even if the source and destination are the same IP addresses and would otherwise be routed locally.

func (*IPAM) NodeIDFromPodIP 

func (i *IPAM) NodeIDFromPodIP(podIP net.IP) (uint32, error)

NodeIDFromPodIP returns node ID from provided POD IP address.

func (*IPAM) NodeIPAddress 

func (i *IPAM) NodeIPAddress(nodeID uint32) (net.IP, *net.IPNet, error)

NodeIPAddress computes IP address of the node based on the provided node ID.

func (*IPAM) PodGatewayIP 

func (i *IPAM) PodGatewayIP() net.IP

PodGatewayIP returns gateway IP address of the POD subnet of this node.

func (*IPAM) PodSubnetAllNodes 

func (i *IPAM) PodSubnetAllNodes() *net.IPNet

PodSubnetAllNodes returns POD subnet that is a base subnet for all PODs of all nodes.

func (*IPAM) PodSubnetOtherNode 

func (i *IPAM) PodSubnetOtherNode(nodeID uint32) (*net.IPNet, error)

PodSubnetOtherNode returns the POD network of another node identified by nodeID.

func (*IPAM) PodSubnetThisNode 

func (i *IPAM) PodSubnetThisNode() *net.IPNet

PodSubnetThisNode returns POD network for the current node (given by nodeID given at IPAM creation).

func (*IPAM) ReleasePodIPs 

func (i *IPAM) ReleasePodIPs(podID podmodel.ID) error

ReleasePodIPs releases the pod IP address making it available for new PODs.

func (*IPAM) Resync 

func (i *IPAM) Resync(event controller.Event, kubeStateData controller.KubeStateData,
	resyncCount int, txn controller.ResyncOperations) (err error)

Resync resynchronizes IPAM against the configuration and Kubernetes state data. A set of already allocated pod IPs is updated.

func (*IPAM) Revert 

func (i *IPAM) Revert(event controller.Event) error

Revert is NOOP - never called.

func (*IPAM) ServiceNetwork 

func (i *IPAM) ServiceNetwork() *net.IPNet

ServiceNetwork returns range allocated for services.

func (*IPAM) SidForNodeToNodeHostLocalsid 

func (i *IPAM) SidForNodeToNodeHostLocalsid(nodeIP net.IP) net.IP

SidForNodeToNodeHostLocalsid creates a valid SRv6 SID for locasid that is part of node-to-node Srv6 tunnel and outputs packets to main VRF table.

func (*IPAM) SidForNodeToNodePodLocalsid 

func (i *IPAM) SidForNodeToNodePodLocalsid(nodeIP net.IP) net.IP

SidForNodeToNodePodLocalsid creates a valid SRv6 SID for locasid that is part of node-to-node Srv6 tunnel and outputs packets to pod VRF table.

func (*IPAM) SidForServiceHostLocalsid 

func (i *IPAM) SidForServiceHostLocalsid() net.IP

SidForServiceHostLocalsid creates a valid SRv6 SID for service locasid leading to host on the current node. Created SID doesn't depend on anything and is the same for each node, because there is only one way how to get to host in each node and localsid have local significance (their sid don't have to be globally unique)

func (*IPAM) SidForServiceNodeLocalsid 

func (i *IPAM) SidForServiceNodeLocalsid(nodeIP net.IP) net.IP

SidForServiceNodeLocalsid creates a valid SRv6 SID for service locasid serving as intermediate step in policy segment list.

func (*IPAM) SidForServicePodLocalsid 

func (i *IPAM) SidForServicePodLocalsid(backendIP net.IP) net.IP

SidForServicePodLocalsid creates a valid SRv6 SID for service locasid leading to pod backend. The SID creation is based on backend IP <backendIP>.

func (*IPAM) Update 

func (i *IPAM) Update(event controller.Event, txn controller.UpdateOperations) (changeDescription string, err error)

Update handles NodeUpdate event in case that external IPAM is in use.

func (*IPAM) VxlanIPAddress 

func (i *IPAM) VxlanIPAddress(nodeID uint32) (net.IP, *net.IPNet, error)

VxlanIPAddress computes IP address of the VXLAN interface based on the provided node ID.

type Option 

type Option func(*IPAM)

Option is a function that acts on a Plugin to inject Dependencies or configuration

func UseDeps 

func UseDeps(cb func(*Deps)) Option

UseDeps returns Option that can inject custom dependencies.

type PodCIDRChange 

type PodCIDRChange struct {
	LocalPodCIDR *net.IPNet
}

PodCIDRChange is triggered when CIDR for PODs on the current node changes.

func (*PodCIDRChange) Done 

func (ev *PodCIDRChange) Done(error)

Done is NOOP.

func (*PodCIDRChange) GetName 

func (ev *PodCIDRChange) GetName() string

GetName returns name of the PodCIDRChange event.

func (*PodCIDRChange) IsBlocking 

func (ev *PodCIDRChange) IsBlocking() bool

IsBlocking returns false.

func (*PodCIDRChange) Method 

func (ev *PodCIDRChange) Method() controller.EventMethodType

Method is UpstreamResync.

func (*PodCIDRChange) String 

func (ev *PodCIDRChange) String() string

String describes PodCIDRChange event.

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