inet

package
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 Go to latest Published: Dec 18, 2024 License: Apache-2.0, MIT Imports: 15 Imported by: 28

Documentation

Overview

Package inet defines semantics for IP stacks.

Index

Constants

View Source 
const (
	// CtxStack is a Context.Value key for a network stack.
	CtxStack contextID = iota
	// CtxNamespaceByFD is a Context.Value key for NamespaceByFD.
	CtxNamespaceByFD
)

Variables

This section is empty.

Functions

This section is empty.

Types

type AbstractSocketNamespace 

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

AbstractSocketNamespace is used to implement the Linux abstract socket functionality.

+stateify savable

func (*AbstractSocketNamespace) Bind 

func (a *AbstractSocketNamespace) Bind(ctx context.Context, path string, ep transport.BoundEndpoint, socket refs.TryRefCounter) (string, *syserr.Error)

Bind binds the given socket.

When the last reference managed by socket is dropped, ep may be removed from the namespace.

func (*AbstractSocketNamespace) BoundEndpoint 

func (a *AbstractSocketNamespace) BoundEndpoint(name string) transport.BoundEndpoint

BoundEndpoint retrieves the endpoint bound to the given name. The return value is nil if no endpoint was bound.

func (*AbstractSocketNamespace) Remove 

func (a *AbstractSocketNamespace) Remove(name string, socket refs.TryRefCounter)

Remove removes the specified socket at name from the abstract socket namespace, if it has not yet been replaced.

type Interface 

type Interface struct {
	// DeviceType is the device type, a Linux ARPHRD_* constant.
	DeviceType uint16

	// Flags is the device flags; see netdevice(7), under "Ioctls",
	// "SIOCGIFFLAGS, SIOCSIFFLAGS".
	Flags uint32

	// Name is the device name.
	Name string

	// Addr is the hardware device address.
	Addr []byte

	// MTU is the maximum transmission unit.
	MTU uint32

	// Features are the device features queried from the host at
	// stack creation time. These are immutable after startup.
	Features []linux.EthtoolGetFeaturesBlock
}

Interface contains information about a network interface.

type InterfaceAddr 

type InterfaceAddr struct {
	// Family is the address family, a Linux AF_* constant.
	Family uint8

	// PrefixLen is the address prefix length.
	PrefixLen uint8

	// Flags is the address flags.
	Flags uint8

	// Addr is the actual address.
	Addr []byte
}

InterfaceAddr contains information about a network interface address.

type InterfaceRequest 

type InterfaceRequest struct {
	// Kind is the link type.
	Kind string
	// Name is the interface name.
	Name string
	// Addr is the hardware device address.
	Addr []byte
	// MTU is the maximum transmission unit.
	MTU uint32
	// Data is link type specific device properties.
	Data any
}

InterfaceRequest contains information about an adding interface.

type Namespace 

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

Namespace represents a network namespace. See network_namespaces(7).

+stateify savable

func NewNamespace 

func NewNamespace(root *Namespace, userNS *auth.UserNamespace) *Namespace

NewNamespace creates a new network namespace from the root.

func NewRootNamespace 

func NewRootNamespace(stack Stack, creator NetworkStackCreator, userNS *auth.UserNamespace) *Namespace

NewRootNamespace creates the root network namespace, with creator allowing new network namespaces to be created. If creator is nil, no networking will function if the network is namespaced.

func (*Namespace) AbstractSockets 

func (n *Namespace) AbstractSockets() *AbstractSocketNamespace

AbstractSockets returns AbstractSocketNamespace.

func (*Namespace) DecRef 

func (n *Namespace) DecRef(ctx context.Context)

DecRef decrements the Namespace's refcount.

func (*Namespace) Destroy 

func (n *Namespace) Destroy(ctx context.Context)

Destroy implements nsfs.Namespace.Destroy.

func (*Namespace) GetInode 

func (n *Namespace) GetInode() *nsfs.Inode

GetInode returns the nsfs inode associated with this namespace.

func (*Namespace) IncRef 

func (n *Namespace) IncRef()

IncRef increments the Namespace's refcount.

func (*Namespace) IsRoot 

func (n *Namespace) IsRoot() bool

IsRoot returns whether n is the root network namespace.

func (*Namespace) ResetStack 

func (n *Namespace) ResetStack()

ResetStack resets the stack in the network namespace to nil. This should only be called when restoring kernel.

func (*Namespace) RestoreRootStack 

func (n *Namespace) RestoreRootStack(stack Stack)

RestoreRootStack restores the root network namespace with stack. This should only be called when restoring kernel.

func (*Namespace) SetInode 

func (n *Namespace) SetInode(inode *nsfs.Inode)

SetInode sets the nsfs `inode` to the namespace.

func (*Namespace) Stack 

func (n *Namespace) Stack() Stack

Stack returns the network stack of n. Stack may return nil if no network stack is configured.

func (*Namespace) Type 

func (n *Namespace) Type() string

Type implements nsfs.Namespace.Type.

func (*Namespace) UserNamespace 

func (n *Namespace) UserNamespace() *auth.UserNamespace

UserNamespace returns the user namespace associated with this namespace.

type NamespaceByFD 

type NamespaceByFD = func(fd int32) (*Namespace, error)

NamespaceByFD returns the network namespace associated with the specified file descriptor.

func NamespaceByFDFromContext 

func NamespaceByFDFromContext(ctx context.Context) NamespaceByFD

NamespaceByFDFromContext returns NamespaceByFD to lookup the network namespace associated with the specified file descriptor.

type NetworkStackCreator 

type NetworkStackCreator interface {
	// CreateStack creates a new network stack for a network namespace.
	CreateStack() (Stack, error)
}

NetworkStackCreator allows new instances of a network stack to be created. It is used by the kernel to create new network namespaces when requested.

type Route 

type Route struct {
	// Family is the address family, a Linux AF_* constant.
	Family uint8

	// DstLen is the length of the destination address.
	DstLen uint8

	// SrcLen is the length of the source address.
	SrcLen uint8

	// TOS is the Type of Service filter.
	TOS uint8

	// Table is the routing table ID.
	Table uint8

	// Protocol is the route origin, a Linux RTPROT_* constant.
	Protocol uint8

	// Scope is the distance to destination, a Linux RT_SCOPE_* constant.
	Scope uint8

	// Type is the route origin, a Linux RTN_* constant.
	Type uint8

	// Flags are route flags. See rtnetlink(7) under "rtm_flags".
	Flags uint32

	// DstAddr is the route destination address (RTA_DST).
	DstAddr []byte

	// SrcAddr is the route source address (RTA_SRC).
	SrcAddr []byte

	// OutputInterface is the output interface index (RTA_OIF).
	OutputInterface int32

	// GatewayAddr is the route gateway address (RTA_GATEWAY).
	GatewayAddr []byte
}

Route contains information about a network route.

type Stack 

type Stack interface {
	// Interfaces returns all network interfaces as a mapping from interface
	// indexes to interface properties. Interface indices are strictly positive
	// integers.
	Interfaces() map[int32]Interface

	// RemoveInterface removes the specified network interface.
	RemoveInterface(idx int32) error

	// InterfaceAddrs returns all network interface addresses as a mapping from
	// interface indexes to a slice of associated interface address properties.
	InterfaceAddrs() map[int32][]InterfaceAddr

	// AddInterfaceAddr adds an address to the network interface identified by
	// idx.
	AddInterfaceAddr(idx int32, addr InterfaceAddr) error

	// SetInterface modifies or adds a new interface.
	SetInterface(ctx context.Context, msg *nlmsg.Message) *syserr.Error

	// RemoveInterfaceAddr removes an address from the network interface
	// identified by idx.
	RemoveInterfaceAddr(idx int32, addr InterfaceAddr) error

	// SupportsIPv6 returns true if the stack supports IPv6 connectivity.
	SupportsIPv6() bool

	// TCPReceiveBufferSize returns TCP receive buffer size settings.
	TCPReceiveBufferSize() (TCPBufferSize, error)

	// SetTCPReceiveBufferSize attempts to change TCP receive buffer size
	// settings.
	SetTCPReceiveBufferSize(size TCPBufferSize) error

	// TCPSendBufferSize returns TCP send buffer size settings.
	TCPSendBufferSize() (TCPBufferSize, error)

	// SetTCPSendBufferSize attempts to change TCP send buffer size settings.
	SetTCPSendBufferSize(size TCPBufferSize) error

	// TCPSACKEnabled returns true if RFC 2018 TCP Selective Acknowledgements
	// are enabled.
	TCPSACKEnabled() (bool, error)

	// SetTCPSACKEnabled attempts to change TCP selective acknowledgement
	// settings.
	SetTCPSACKEnabled(enabled bool) error

	// TCPRecovery returns the TCP loss detection algorithm.
	TCPRecovery() (TCPLossRecovery, error)

	// SetTCPRecovery attempts to change TCP loss detection algorithm.
	SetTCPRecovery(recovery TCPLossRecovery) error

	// Statistics reports stack statistics.
	Statistics(stat any, arg string) error

	// RouteTable returns the network stack's route table.
	RouteTable() []Route

	// RemoveRoute deletes the specified route.
	RemoveRoute(ctx context.Context, msg *nlmsg.Message) *syserr.Error

	// NewRoute adds the given route to the network stack's route table.
	NewRoute(ctx context.Context, msg *nlmsg.Message) *syserr.Error

	// Pause pauses the network stack before save.
	Pause()

	// Resume resumes the network stack after save.
	Resume()

	// Restore restarts the network stack after restore.
	Restore()

	// ReplaceConfig replaces the new network stack configuration to the
	// loaded or saved network stack after restore.
	// TODO(b/379115439): This method is a workaround to update netstack config
	// during restore. It should be removed after a new method is added to
	// extract the complete config from the spec and update it in the loaded
	// stack during restore.
	ReplaceConfig(st Stack)

	// Destroy the network stack.
	Destroy()

	// RegisteredEndpoints returns all endpoints which are currently registered.
	RegisteredEndpoints() []stack.TransportEndpoint

	// CleanupEndpoints returns endpoints currently in the cleanup state.
	CleanupEndpoints() []stack.TransportEndpoint

	// RestoreCleanupEndpoints adds endpoints to cleanup tracking. This is useful
	// for restoring a stack after a save.
	RestoreCleanupEndpoints([]stack.TransportEndpoint)

	// SetForwarding enables or disables packet forwarding between NICs.
	SetForwarding(protocol tcpip.NetworkProtocolNumber, enable bool) error

	// PortRange returns the UDP and TCP inclusive range of ephemeral ports
	// used in both IPv4 and IPv6.
	PortRange() (uint16, uint16)

	// SetPortRange sets the UDP and TCP IPv4 and IPv6 ephemeral port range
	// (inclusive).
	SetPortRange(start uint16, end uint16) error

	// EnableSaveRestore enables netstack s/r.
	EnableSaveRestore() error

	// IsSaveRestoreEnabled returns true when netstack s/r is enabled.
	IsSaveRestoreEnabled() bool
}

Stack represents a TCP/IP stack.

func StackFromContext 

func StackFromContext(ctx context.Context) Stack

StackFromContext returns the network stack associated with ctx.

type StatDev 

type StatDev [16]uint64

StatDev describes one line of /proc/net/dev, i.e., stats for one network interface.

type StatSNMPICMP 

type StatSNMPICMP [27]uint64

StatSNMPICMP describes Icmp line of /proc/net/snmp.

type StatSNMPICMPMSG 

type StatSNMPICMPMSG [512]uint64

StatSNMPICMPMSG describes IcmpMsg line of /proc/net/snmp.

type StatSNMPIP 

type StatSNMPIP [19]uint64

StatSNMPIP describes Ip line of /proc/net/snmp.

type StatSNMPTCP 

type StatSNMPTCP [15]uint64

StatSNMPTCP describes Tcp line of /proc/net/snmp.

type StatSNMPUDP 

type StatSNMPUDP [8]uint64

StatSNMPUDP describes Udp line of /proc/net/snmp.

type StatSNMPUDPLite 

type StatSNMPUDPLite [8]uint64

StatSNMPUDPLite describes UdpLite line of /proc/net/snmp.

type TCPBufferSize 

type TCPBufferSize struct {
	// Min is the minimum size.
	Min int

	// Default is the default size.
	Default int

	// Max is the maximum size.
	Max int
}

TCPBufferSize contains settings controlling TCP buffer sizing.

+stateify savable

type TCPLossRecovery 

type TCPLossRecovery int32

TCPLossRecovery indicates TCP loss detection and recovery methods to use. 

const (
	TCP_RACK_LOSS_DETECTION TCPLossRecovery = 1 << iota
	TCP_RACK_STATIC_REO_WND
	TCP_RACK_NO_DUPTHRESH
)

Loss recovery constants from include/net/tcp.h which are used to set /proc/sys/net/ipv4/tcp_recovery.

type TestStack 

type TestStack struct {
	InterfacesMap     map[int32]Interface
	InterfaceAddrsMap map[int32][]InterfaceAddr
	RouteList         []Route
	SupportsIPv6Flag  bool
	TCPRecvBufSize    TCPBufferSize
	TCPSendBufSize    TCPBufferSize
	TCPSACKFlag       bool
	Recovery          TCPLossRecovery
	IPForwarding      bool
}

TestStack is a dummy implementation of Stack for tests.

func NewTestStack 

func NewTestStack() *TestStack

NewTestStack returns a TestStack with no network interfaces. The value of all other options is unspecified; tests that rely on specific values must set them explicitly.

func (*TestStack) AddInterfaceAddr 

func (s *TestStack) AddInterfaceAddr(idx int32, addr InterfaceAddr) error

AddInterfaceAddr implements Stack.

func (*TestStack) CleanupEndpoints 

func (s *TestStack) CleanupEndpoints() []stack.TransportEndpoint

CleanupEndpoints implements Stack.

func (*TestStack) Destroy 

func (s *TestStack) Destroy()

Destroy implements Stack.

func (*TestStack) EnableSaveRestore 

func (*TestStack) EnableSaveRestore() error

EnableSaveRestore implements Stack.

func (*TestStack) GROTimeout 

func (*TestStack) GROTimeout(NICID int32) (time.Duration, error)

GROTimeout implements Stack.

func (*TestStack) InterfaceAddrs 

func (s *TestStack) InterfaceAddrs() map[int32][]InterfaceAddr

InterfaceAddrs implements Stack.

func (*TestStack) Interfaces 

func (s *TestStack) Interfaces() map[int32]Interface

Interfaces implements Stack.

func (*TestStack) IsSaveRestoreEnabled 

func (*TestStack) IsSaveRestoreEnabled() bool

IsSaveRestoreEnabled implements Stack.

func (*TestStack) NewRoute 

func (s *TestStack) NewRoute(ctx context.Context, msg *nlmsg.Message) *syserr.Error

NewRoute implements Stack.

func (*TestStack) Pause 

func (s *TestStack) Pause()

Pause implements Stack.

func (*TestStack) PortRange 

func (*TestStack) PortRange() (uint16, uint16)

PortRange implements Stack.

func (*TestStack) RegisteredEndpoints 

func (s *TestStack) RegisteredEndpoints() []stack.TransportEndpoint

RegisteredEndpoints implements Stack.

func (*TestStack) RemoveInterface 

func (s *TestStack) RemoveInterface(idx int32) error

RemoveInterface implements Stack.

func (*TestStack) RemoveInterfaceAddr 

func (s *TestStack) RemoveInterfaceAddr(idx int32, addr InterfaceAddr) error

RemoveInterfaceAddr implements Stack.

func (*TestStack) RemoveRoute 

func (s *TestStack) RemoveRoute(ctx context.Context, msg *nlmsg.Message) *syserr.Error

RemoveRoute implements Stack.

func (*TestStack) ReplaceConfig 

func (s *TestStack) ReplaceConfig(_ Stack)

ReplaceConfig implements Stack.

func (*TestStack) Restore 

func (s *TestStack) Restore()

Restore implements Stack.

func (*TestStack) RestoreCleanupEndpoints 

func (s *TestStack) RestoreCleanupEndpoints([]stack.TransportEndpoint)

RestoreCleanupEndpoints implements Stack.

func (*TestStack) Resume 

func (s *TestStack) Resume()

Resume implements Stack.

func (*TestStack) RouteTable 

func (s *TestStack) RouteTable() []Route

RouteTable implements Stack.

func (*TestStack) SetForwarding 

func (s *TestStack) SetForwarding(protocol tcpip.NetworkProtocolNumber, enable bool) error

SetForwarding implements Stack.

func (*TestStack) SetGROTimeout 

func (*TestStack) SetGROTimeout(NICID int32, timeout time.Duration) error

SetGROTimeout implements Stack.

func (*TestStack) SetInterface 

func (s *TestStack) SetInterface(ctx context.Context, msg *nlmsg.Message) *syserr.Error

SetInterface implements Stack.

func (*TestStack) SetPortRange 

func (*TestStack) SetPortRange(start uint16, end uint16) error

SetPortRange implements Stack.

func (*TestStack) SetTCPReceiveBufferSize 

func (s *TestStack) SetTCPReceiveBufferSize(size TCPBufferSize) error

SetTCPReceiveBufferSize implements Stack.

func (*TestStack) SetTCPRecovery 

func (s *TestStack) SetTCPRecovery(recovery TCPLossRecovery) error

SetTCPRecovery implements Stack.

func (*TestStack) SetTCPSACKEnabled 

func (s *TestStack) SetTCPSACKEnabled(enabled bool) error

SetTCPSACKEnabled implements Stack.

func (*TestStack) SetTCPSendBufferSize 

func (s *TestStack) SetTCPSendBufferSize(size TCPBufferSize) error

SetTCPSendBufferSize implements Stack.

func (*TestStack) Statistics 

func (s *TestStack) Statistics(stat any, arg string) error

Statistics implements Stack.

func (*TestStack) SupportsIPv6 

func (s *TestStack) SupportsIPv6() bool

SupportsIPv6 implements Stack.

func (*TestStack) TCPReceiveBufferSize 

func (s *TestStack) TCPReceiveBufferSize() (TCPBufferSize, error)

TCPReceiveBufferSize implements Stack.

func (*TestStack) TCPRecovery 

func (s *TestStack) TCPRecovery() (TCPLossRecovery, error)

TCPRecovery implements Stack.

func (*TestStack) TCPSACKEnabled 

func (s *TestStack) TCPSACKEnabled() (bool, error)

TCPSACKEnabled implements Stack.

func (*TestStack) TCPSendBufferSize 

func (s *TestStack) TCPSendBufferSize() (TCPBufferSize, error)

TCPSendBufferSize implements Stack.

type VethPeerReq 

type VethPeerReq struct {
	// Req is information about the second end of the new veth pair.
	Req InterfaceRequest
	// Stack is the stack where the second end has to be added.
	Stack Stack
}

VethPeerReq contains information about a second interface of a new veth pair.

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