osl

Documentation

Overview

Package osl describes structures and interfaces which abstract os entities

Index

• Constants
• func GC()
• func GenerateKey(containerID string) string
• func SetBasePath(path string)
• type Iface
• type IfaceOption
• type IfaceOptionSetter
• type Info
• type Interface
• type NeighOption
• type NeighborOptionSetter
• type NeighborSearchError
  • func (n NeighborSearchError) Error() string
• type Sandbox
  • func GetSandboxForExternalKey(basePath string, key string) (Sandbox, error)
  • func NewSandbox(key string, osCreate, isRestore bool) (Sandbox, error)
• type SandboxType

Constants

const (
	// SandboxTypeIngress indicates that the sandbox is for the ingress
	SandboxTypeIngress = iota
	// SandboxTypeLoadBalancer indicates that the sandbox is a load balancer
	SandboxTypeLoadBalancer = iota
)

Functions

func GC

func GC()

GC triggers garbage collection of namespace path right away and waits for it.

func GenerateKey

func GenerateKey(containerID string) string

GenerateKey generates a sandbox key based on the passed container id.

func SetBasePath

func SetBasePath(path string)

SetBasePath sets the base url prefix for the ns path

Types

type Iface

type Iface struct {
	SrcName, DstPrefix string
}

type IfaceOption

type IfaceOption func(i *nwIface)

IfaceOption is a function option type to set interface options.

type IfaceOptionSetter

type IfaceOptionSetter interface {
	// Bridge returns an option setter to set if the interface is a bridge.
	Bridge(bool) IfaceOption

	// MacAddress returns an option setter to set the MAC address.
	MacAddress(net.HardwareAddr) IfaceOption

	// Address returns an option setter to set IPv4 address.
	Address(*net.IPNet) IfaceOption

	// AddressIPv6 returns an option setter to set IPv6 address.
	AddressIPv6(*net.IPNet) IfaceOption

	// LinkLocalAddresses returns an option setter to set the link-local IP addresses.
	LinkLocalAddresses([]*net.IPNet) IfaceOption

	// Master returns an option setter to set the master interface if any for this
	// interface. The master interface name should refer to the srcname of a
	// previously added interface of type bridge.
	Master(string) IfaceOption

	// Routes returns an option setter to set interface routes.
	Routes([]*net.IPNet) IfaceOption
}

IfaceOptionSetter interface defines the option setter methods for interface options.

type Info

type Info interface {
	// Interfaces returns the collection of Interface previously added with the AddInterface
	// method. Note that this doesn't include network interfaces added in any
	// other way (such as the default loopback interface which is automatically
	// created on creation of a sandbox).
	Interfaces() []Interface

	// Gateway returns the IPv4 gateway for the sandbox.
	Gateway() net.IP

	// GatewayIPv6 returns the IPv6 gateway for the sandbox.
	GatewayIPv6() net.IP

	// StaticRoutes returns additional static routes for the sandbox. Note that
	// directly connected routes are stored on the particular interface they
	// refer to.
	StaticRoutes() []*types.StaticRoute
}

Info represents all possible information that the driver wants to place in the sandbox which includes interfaces, routes and gateway

type Interface

type Interface interface {
	// SrcName returns the name of the interface in the origin network namespace.
	SrcName() string

	// DstName returns the name that will be assigned to the interface once
	// moved inside a network namespace. When the caller passes in a DstName,
	// it is only expected to pass a prefix. The name will be modified with an
	// auto-generated suffix.
	DstName() string

	// Address returns the IPv4 address for the interface.
	Address() *net.IPNet

	// AddressIPv6 returns the IPv6 address for the interface.
	AddressIPv6() *net.IPNet

	// LinkLocalAddresses returns the link-local IP addresses assigned to the
	// interface.
	LinkLocalAddresses() []*net.IPNet

	// Routes returns IP routes for the interface.
	Routes() []*net.IPNet

	// Bridge returns true if the interface is a bridge.
	Bridge() bool

	// Master returns the srcname of the master interface for this interface.
	Master() string

	// Remove an interface from the sandbox by renaming to original name
	// and moving it out of the sandbox.
	Remove() error

	// Statistics returns the statistics for this interface
	Statistics() (*types.InterfaceStatistics, error)
}

Interface represents the settings and identity of a network device. It is used as a return type for Network.Link, and it is common practice for the caller to use this information when moving interface SrcName from host namespace to DstName in a different net namespace with the appropriate network settings.

type NeighOption

type NeighOption func(nh *neigh)

NeighOption is a function option type to set neighbor options.

type NeighborOptionSetter

type NeighborOptionSetter interface {
	// LinkName returns an option setter to set the srcName of the link that should
	// be used in the neighbor entry
	LinkName(string) NeighOption

	// Family returns an option setter to set the address family for the neighbor
	// entry. eg. AF_BRIDGE
	Family(int) NeighOption
}

NeighborOptionSetter interface defines the option setter methods for interface options

type NeighborSearchError

type NeighborSearchError struct {
	// contains filtered or unexported fields
}

NeighborSearchError indicates that the neighbor is already present

func (NeighborSearchError) Error

func (n NeighborSearchError) Error() string

type Sandbox

type Sandbox interface {
	// Key returns the path where the network namespace is mounted.
	Key() string

	// AddInterface adds an existing Interface to this sandbox. The operation will rename
	// from the Interface SrcName to DstName as it moves, and reconfigure the
	// interface according to the specified settings. The caller is expected
	// to only provide a prefix for DstName. The AddInterface api will auto-generate
	// an appropriate suffix for the DstName to disambiguate.
	AddInterface(SrcName string, DstPrefix string, options ...IfaceOption) error

	// SetGateway sets the default IPv4 gateway for the sandbox.
	SetGateway(gw net.IP) error

	// SetGatewayIPv6 sets the default IPv6 gateway for the sandbox.
	SetGatewayIPv6(gw net.IP) error

	// UnsetGateway the previously set default IPv4 gateway in the sandbox.
	UnsetGateway() error

	// UnsetGatewayIPv6 unsets the previously set default IPv6 gateway in the sandbox.
	UnsetGatewayIPv6() error

	// GetLoopbackIfaceName returns the name of the loopback interface
	GetLoopbackIfaceName() string

	// AddAliasIP adds the passed IP address to the named interface
	AddAliasIP(ifName string, ip *net.IPNet) error

	// RemoveAliasIP removes the passed IP address from the named interface
	RemoveAliasIP(ifName string, ip *net.IPNet) error

	// DisableARPForVIP disables ARP replies and requests for VIP addresses
	// on a particular interface.
	DisableARPForVIP(ifName string) error

	// AddStaticRoute adds a static route to the sandbox.
	AddStaticRoute(*types.StaticRoute) error

	// RemoveStaticRoute removes a static route from the sandbox.
	RemoveStaticRoute(*types.StaticRoute) error

	// AddNeighbor adds a neighbor entry into the sandbox.
	AddNeighbor(dstIP net.IP, dstMac net.HardwareAddr, force bool, option ...NeighOption) error

	// DeleteNeighbor deletes neighbor entry from the sandbox.
	DeleteNeighbor(dstIP net.IP, dstMac net.HardwareAddr, osDelete bool) error

	// NeighborOptions returns an interface with methods to set neighbor options.
	NeighborOptions() NeighborOptionSetter

	// InterfaceOptions an interface with methods to set interface options.
	InterfaceOptions() IfaceOptionSetter

	// InvokeFunc invoke a function in the network namespace.
	InvokeFunc(func()) error

	// Info returns an interface with methods to get sandbox state.
	Info() Info

	// Destroy destroys the sandbox.
	Destroy() error

	// Restore restores the sandbox.
	Restore(ifsopt map[Iface][]IfaceOption, routes []*types.StaticRoute, gw net.IP, gw6 net.IP) error

	// ApplyOSTweaks applies operating system specific knobs on the sandbox.
	ApplyOSTweaks([]SandboxType)
}

Sandbox represents a network sandbox, identified by a specific key. It holds a list of Interfaces, routes etc, and more can be added dynamically.

func GetSandboxForExternalKey

func GetSandboxForExternalKey(basePath string, key string) (Sandbox, error)

GetSandboxForExternalKey returns sandbox object for the supplied path

func NewSandbox

func NewSandbox(key string, osCreate, isRestore bool) (Sandbox, error)

NewSandbox provides a new sandbox instance created in an os specific way provided a key which uniquely identifies the sandbox

type SandboxType

type SandboxType int

SandboxType specify the time of the sandbox, this can be used to apply special configs