router

package
v1.2.0 Latest Latest
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 Go to latest Published: Oct 22, 2015 License: Apache-2.0 Imports: 29 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	InitialInterval = 2 * time.Second
	MaxInterval     = 6 * time.Minute
	ResetAfter      = 1 * time.Minute
)
View Source 
const (
	Port                = 6783
	HTTPPort            = Port + 1
	MaxUDPPacketSize    = 65535
	ChannelSize         = 16
	TCPHeartbeat        = 30 * time.Second
	GossipInterval      = 30 * time.Second
	MaxDuration         = time.Duration(math.MaxInt64)
	MaxTCPMsgSize       = 10 * 1024 * 1024
	FastHeartbeat       = 500 * time.Millisecond
	SlowHeartbeat       = 10 * time.Second
	MaxMissedHeartbeats = 6
	HeartbeatTimeout    = MaxMissedHeartbeats * SlowHeartbeat
)
View Source 
const (
	PeerNameFlavour = "mac"
	NameSize        = 6
	UnknownPeerName = PeerName(0)
)
View Source 
const (
	Protocol           = "weave"
	ProtocolMinVersion = 1
	ProtocolMaxVersion = 2
)
View Source 
const (
	ProtocolHeartbeat = iota
	ProtocolConnectionEstablished
	ProtocolFragmentationReceived
	ProtocolPMTUVerified
	ProtocolGossip
	ProtocolGossipUnicast
	ProtocolGossipBroadcast
	ProtocolOverlayControlMsg
)
View Source 
const (
	EthernetOverhead  = 14
	UDPOverhead       = 28 // 20 bytes for IPv4, 8 bytes for UDP
	DefaultMTU        = 65535
	FragTestSize      = 60001
	PMTUDiscoverySize = 60000
	FragTestInterval  = 5 * time.Minute
	MTUVerifyAttempts = 8
	MTUVerifyTimeout  = 10 * time.Millisecond // doubled with each attempt
)
View Source 
const (
	FastDatapathHeartbeatAck = iota
)
View Source 
const PeerShortIDBits = 12
View Source 
const (
	WindowSize = 20 // bits
)

Variables

View Source 
var (
	ProtocolBytes = []byte(Protocol)

	HeaderTimeout = 10 * time.Second

	ProtocolV1Features = []string{
		"ConnID",
		"Name",
		"NickName",
		"PeerNameFlavour",
		"UID",
	}

	ErrExpectedCrypto   = fmt.Errorf("Password specified, but peer requested an unencrypted connection")
	ErrExpectedNoCrypto = fmt.Errorf("No password specificed, but peer requested an encrypted connection")
)
View Source 
var ErrConnectToSelf = fmt.Errorf("Cannot connect to ourself")

Functions

func AddDatapathInterface added in v1.2.0 

func AddDatapathInterface(dpname string, ifname string) error

func Concat 

func Concat(elems ...[]byte) []byte

func CreateDatapath added in v1.2.0 

func CreateDatapath(dpname string) error

func DeleteDatapath added in v1.2.0 

func DeleteDatapath(dpname string) error

func FormSessionKey 

func FormSessionKey(remotePublicKey, localPrivateKey *[32]byte, secretKey []byte) *[32]byte

func GenerateKeyPair 

func GenerateKeyPair() (publicKey, privateKey *[32]byte, err error)

func GobEncode added in v0.9.0 

func GobEncode(items ...interface{}) []byte

func NewTargetSlice added in v1.1.0 

func NewTargetSlice(cm *ConnectionMaker) []string

func PosixError 

func PosixError(err error) error

Look inside an error produced by the net package to get to the syscall.Errno at the root of the problem.

func StartLocalConnection added in v1.1.0 

func StartLocalConnection(connRemote *RemoteConnection, tcpConn *net.TCPConn, udpAddr *net.UDPAddr, router *Router, acceptNewPeer bool)

Does not return anything. If the connection is successful, it will end up in the local peer's connections map.

Types

type Bridge added in v1.2.0 

type Bridge interface {
	// Inject a packet to be delivered locally
	InjectPacket(PacketKey) FlowOp

	// Start consuming packets from the bridge.  Injected packets
	// should not be included.
	StartConsumingPackets(BridgeConsumer) error

	String() string
	Stats() map[string]int
}

Interface to packet handling on the local virtual bridge

func NewPcap added in v1.2.0 

func NewPcap(iface *net.Interface, bufSz int) (Bridge, error)

type BridgeConsumer added in v1.2.0 

type BridgeConsumer func(PacketKey) FlowOp

A function that determines how to handle locally captured packets.

type BroadcastRouteStatus added in v1.1.0 

type BroadcastRouteStatus struct {
	Source string
	Via    []string
}

func NewBroadcastRouteStatusSlice added in v1.1.0 

func NewBroadcastRouteStatusSlice(routes *Routes) []BroadcastRouteStatus

type Config added in v1.0.0 

type Config struct {
	Port               int
	ProtocolMinVersion byte
	Password           []byte
	ConnLimit          int
	PeerDiscovery      bool
	BufSz              int
	PacketLogging      PacketLogging
	Bridge             Bridge
	Overlay            Overlay
}

type Connection 

type Connection interface {
	Local() *Peer
	Remote() *Peer
	RemoteTCPAddr() string
	Outbound() bool
	Established() bool
	BreakTie(Connection) ConnectionTieBreak
	Shutdown(error)
	Log(args ...interface{})
}

type ConnectionAction added in v0.10.0 

type ConnectionAction func() error

type ConnectionMaker 

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

func NewConnectionMaker added in v0.9.0 

func NewConnectionMaker(ourself *LocalPeer, peers *Peers, port int, discovery bool) *ConnectionMaker

func (*ConnectionMaker) ConnectionAborted added in v1.2.0 

func (cm *ConnectionMaker) ConnectionAborted(address string, err error)

func (*ConnectionMaker) ConnectionCreated added in v1.2.0 

func (cm *ConnectionMaker) ConnectionCreated(conn Connection)

func (*ConnectionMaker) ConnectionTerminated 

func (cm *ConnectionMaker) ConnectionTerminated(conn Connection, err error)

func (*ConnectionMaker) ForgetConnections added in v1.0.0 

func (cm *ConnectionMaker) ForgetConnections(peers []string)

func (*ConnectionMaker) InitiateConnections added in v1.0.0 

func (cm *ConnectionMaker) InitiateConnections(peers []string, replace bool) []error

func (*ConnectionMaker) Refresh 

func (cm *ConnectionMaker) Refresh()

type ConnectionMakerAction added in v0.10.0 

type ConnectionMakerAction func() bool

type ConnectionSet added in v0.10.0 

type ConnectionSet map[Connection]struct{}

type ConnectionStatus added in v1.1.0 

type ConnectionStatus struct {
	Name        string
	NickName    string
	Address     string
	Outbound    bool
	Established bool
}

type ConnectionSummary added in v0.11.0 

type ConnectionSummary struct {
	NameByte      []byte
	RemoteTCPAddr string
	Outbound      bool
	Established   bool
}

type ConnectionTieBreak added in v0.9.0 

type ConnectionTieBreak int
const (
	TieBreakWon ConnectionTieBreak = iota
	TieBreakLost
	TieBreakTied
)

type Decryptor 

type Decryptor interface {
	IterateFrames([]byte, FrameConsumer) error
}

type DiscardingFlowOp added in v1.2.0 

type DiscardingFlowOp struct{}

func (DiscardingFlowOp) Discards added in v1.2.0 

func (DiscardingFlowOp) Discards() bool

func (DiscardingFlowOp) Process added in v1.2.0 

func (DiscardingFlowOp) Process([]byte, *EthernetDecoder, bool)

type EncryptedTCPReceiver 

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

func NewEncryptedTCPReceiver 

func NewEncryptedTCPReceiver(receiver TCPReceiver, sessionKey *[32]byte, outbound bool) *EncryptedTCPReceiver

func (*EncryptedTCPReceiver) Receive added in v1.1.0 

func (receiver *EncryptedTCPReceiver) Receive() ([]byte, error)

type EncryptedTCPSender 

type EncryptedTCPSender struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewEncryptedTCPSender 

func NewEncryptedTCPSender(sender TCPSender, sessionKey *[32]byte, outbound bool) *EncryptedTCPSender

func (*EncryptedTCPSender) Send 

func (sender *EncryptedTCPSender) Send(msg []byte) error

type Encryptor 

type Encryptor interface {
	FrameOverhead() int
	PacketOverhead() int
	Bytes() ([]byte, error)
	AppendFrame(src []byte, dst []byte, frame []byte)
	TotalLen() int
}

type EthernetDecoder 

type EthernetDecoder struct {
	Eth layers.Ethernet
	IP  layers.IPv4
	// contains filtered or unexported fields
}

func NewEthernetDecoder 

func NewEthernetDecoder() *EthernetDecoder

func (*EthernetDecoder) DF added in v1.1.0 

func (dec *EthernetDecoder) DF() bool

func (*EthernetDecoder) DecodeLayers 

func (dec *EthernetDecoder) DecodeLayers(data []byte)

func (*EthernetDecoder) IsSpecial added in v0.9.0 

func (dec *EthernetDecoder) IsSpecial() bool

func (*EthernetDecoder) PacketKey added in v1.2.0 

func (dec *EthernetDecoder) PacketKey() (key PacketKey)

type FastDatapath added in v1.2.0 

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

func NewFastDatapath added in v1.2.0 

func NewFastDatapath(config FastDatapathConfig) (*FastDatapath, error)

func (*FastDatapath) Bridge added in v1.2.0 

func (fastdp *FastDatapath) Bridge() Bridge

func (*FastDatapath) Close added in v1.2.0 

func (fastdp *FastDatapath) Close() error

func (*FastDatapath) Error added in v1.2.0 

func (fastdp *FastDatapath) Error(err error, stopped bool)

func (*FastDatapath) Miss added in v1.2.0 

func (fastdp *FastDatapath) Miss(packet []byte, fks odp.FlowKeys) error

func (*FastDatapath) Overlay added in v1.2.0 

func (fastdp *FastDatapath) Overlay() Overlay

func (*FastDatapath) VportCreated added in v1.2.0 

func (fastdp *FastDatapath) VportCreated(dpid odp.DatapathID, vport odp.Vport) error

func (*FastDatapath) VportDeleted added in v1.2.0 

func (fastdp *FastDatapath) VportDeleted(dpid odp.DatapathID, vport odp.Vport) error

type FastDatapathConfig added in v1.2.0 

type FastDatapathConfig struct {
	DatapathName        string
	Port                int
	ExpireFlowsInterval time.Duration
	ExpireMACsInterval  time.Duration
}

type FlowOp added in v1.2.0 

type FlowOp interface {
	// The caller must supply an EthernetDecoder specific to this
	// thread, which has already been used to decode the frame.
	// The broadcast parameter is a hint whether the packet is
	// being broadcast.
	Process(frame []byte, dec *EthernetDecoder, broadcast bool)

	// Does the FlowOp discard the packet?
	Discards() bool
}

func FlattenFlowOp added in v1.2.0 

func FlattenFlowOp(fop FlowOp) []FlowOp

type FlowStatus added in v1.2.0 

type FlowStatus odp.FlowInfo

func (*FlowStatus) MarshalJSON added in v1.2.0 

func (flowStatus *FlowStatus) MarshalJSON() ([]byte, error)

type ForwardPacketKey added in v1.2.0 

type ForwardPacketKey struct {
	SrcPeer *Peer
	DstPeer *Peer
	PacketKey
}

type ForwarderParams added in v1.2.0 

type ForwarderParams struct {
	RemotePeer *Peer

	// The local IP address to use for sending.  Derived from the
	// local address of the corresponding TCP socket, so may
	// differ for different forwarders.
	LocalIP net.IP

	// The remote address to send to.  nil if unknown, i.e. an
	// incoming connection, in which case the Overlay needs to
	// discover it (e.g. from incoming datagrams).
	RemoteAddr *net.UDPAddr

	// Unique identifier for this connection
	ConnUID uint64

	// Crypto bits.  Nil if not encrypting
	Crypto *OverlayCrypto

	// Function to send a control message to the counterpart
	// forwarder.
	SendControlMessage func(tag byte, msg []byte) error

	// Features passed at connection initiation
	Features map[string]string
}

type FrameConsumer 

type FrameConsumer func(src []byte, dst []byte, frame []byte)

type GobTCPReceiver added in v1.1.0 

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

func NewGobTCPReceiver added in v1.1.0 

func NewGobTCPReceiver(decoder *gob.Decoder) *GobTCPReceiver

func (*GobTCPReceiver) Receive added in v1.1.0 

func (receiver *GobTCPReceiver) Receive() ([]byte, error)

type GobTCPSender added in v1.1.0 

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

func NewGobTCPSender added in v1.1.0 

func NewGobTCPSender(encoder *gob.Encoder) *GobTCPSender

func (*GobTCPSender) Send added in v1.1.0 

func (sender *GobTCPSender) Send(msg []byte) error

type Gossip added in v0.9.0 

type Gossip interface {
	// specific message from one peer to another
	// intermediate peers relay it using unicast topology.
	GossipUnicast(dstPeerName PeerName, msg []byte) error
	// send gossip to every peer, relayed using broadcast topology.
	GossipBroadcast(update GossipData) error
}

type GossipChannel added in v0.9.0 

type GossipChannel struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewGossipChannel added in v1.0.0 

func NewGossipChannel(channelName string, ourself *LocalPeer, routes *Routes, g Gossiper) *GossipChannel

func (*GossipChannel) GossipBroadcast added in v0.9.0 

func (c *GossipChannel) GossipBroadcast(update GossipData) error

func (*GossipChannel) GossipUnicast added in v0.9.0 

func (c *GossipChannel) GossipUnicast(dstPeerName PeerName, msg []byte) error

func (*GossipChannel) Send added in v0.10.0 

func (c *GossipChannel) Send(srcName PeerName, data GossipData)

func (*GossipChannel) SendDown added in v0.10.0 

func (c *GossipChannel) SendDown(conn Connection, data GossipData)

type GossipChannels added in v1.0.0 

type GossipChannels map[string]*GossipChannel

type GossipData added in v0.10.0 

type GossipData interface {
	Encode() [][]byte
	Merge(GossipData)
}

type GossipSender added in v0.10.0 

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

Accumulates GossipData that needs to be sent to one destination, and sends it when possible.

func NewGossipSender added in v0.10.0 

func NewGossipSender(send func(GossipData)) *GossipSender

func (*GossipSender) Send added in v0.10.0 

func (sender *GossipSender) Send(data GossipData)

func (*GossipSender) Stop added in v0.10.0 

func (sender *GossipSender) Stop()

type Gossiper added in v0.9.0 

type Gossiper interface {
	OnGossipUnicast(sender PeerName, msg []byte) error
	// merge received data into state and return a representation of
	// the received data, for further propagation
	OnGossipBroadcast(sender PeerName, update []byte) (GossipData, error)
	// return state of everything we know; gets called periodically
	Gossip() GossipData
	// merge received data into state and return "everything new I've
	// just learnt", or nil if nothing in the received data was new
	OnGossip(update []byte) (GossipData, error)
}

type LengthPrefixTCPReceiver added in v1.1.0 

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

func NewLengthPrefixTCPReceiver added in v1.1.0 

func NewLengthPrefixTCPReceiver(reader io.Reader) *LengthPrefixTCPReceiver

func (*LengthPrefixTCPReceiver) Receive added in v1.1.0 

func (receiver *LengthPrefixTCPReceiver) Receive() ([]byte, error)

type LengthPrefixTCPSender added in v1.1.0 

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

func NewLengthPrefixTCPSender added in v1.1.0 

func NewLengthPrefixTCPSender(writer io.Writer) *LengthPrefixTCPSender

func (*LengthPrefixTCPSender) Send added in v1.1.0 

func (sender *LengthPrefixTCPSender) Send(msg []byte) error

type ListOfPeers 

type ListOfPeers []*Peer

func (ListOfPeers) Len 

func (lop ListOfPeers) Len() int

func (ListOfPeers) Less 

func (lop ListOfPeers) Less(i, j int) bool

func (ListOfPeers) Swap 

func (lop ListOfPeers) Swap(i, j int)

type LocalConnection 

type LocalConnection struct {
	sync.RWMutex
	RemoteConnection
	TCPConn *net.TCPConn

	SessionKey *[32]byte

	Router *Router
	// contains filtered or unexported fields
}

func (*LocalConnection) BreakTie added in v0.9.0 

func (conn *LocalConnection) BreakTie(dupConn Connection) ConnectionTieBreak

func (*LocalConnection) Established 

func (conn *LocalConnection) Established() bool

func (*LocalConnection) Forward 

func (conn *LocalConnection) Forward(key ForwardPacketKey) FlowOp

func (*LocalConnection) SendProtocolMsg added in v0.9.0 

func (conn *LocalConnection) SendProtocolMsg(m ProtocolMsg)

Send directly, not via the Actor. If it goes via the Actor we can get a deadlock where LocalConnection is blocked talking to LocalPeer and LocalPeer is blocked trying send a ProtocolMsg via LocalConnection, and the channels are full in both directions so nothing can proceed.

func (*LocalConnection) Shutdown 

func (conn *LocalConnection) Shutdown(err error)

Async

type LocalConnectionStatus added in v1.1.0 

type LocalConnectionStatus struct {
	Address  string
	Outbound bool
	State    string
	Info     string
}

func NewLocalConnectionStatusSlice added in v1.1.0 

func NewLocalConnectionStatusSlice(cm *ConnectionMaker) []LocalConnectionStatus

type LocalPeer 

type LocalPeer struct {
	sync.RWMutex
	*Peer
	// contains filtered or unexported fields
}

func NewLocalPeer added in v0.9.0 

func NewLocalPeer(name PeerName, nickName string, router *Router) *LocalPeer

func (*LocalPeer) AddConnection 

func (peer *LocalPeer) AddConnection(conn *LocalConnection) error

Sync.

func (*LocalPeer) ConnectionEstablished 

func (peer *LocalPeer) ConnectionEstablished(conn *LocalConnection)

Async.

func (*LocalPeer) ConnectionTo added in v0.11.0 

func (peer *LocalPeer) ConnectionTo(name PeerName) (Connection, bool)

func (*LocalPeer) Connections added in v0.11.0 

func (peer *LocalPeer) Connections() ConnectionSet

func (*LocalPeer) ConnectionsTo added in v0.10.0 

func (peer *LocalPeer) ConnectionsTo(names []PeerName) []Connection

func (*LocalPeer) CreateConnection 

func (peer *LocalPeer) CreateConnection(peerAddr string, acceptNewPeer bool) error

func (*LocalPeer) DeleteConnection 

func (peer *LocalPeer) DeleteConnection(conn *LocalConnection)

Sync.

func (*LocalPeer) Encode added in v0.11.0 

func (peer *LocalPeer) Encode(enc *gob.Encoder)

type LocalPeerAction added in v0.10.0 

type LocalPeerAction func()

type MAC added in v1.2.0 

type MAC [6]byte

func (MAC) String added in v1.2.0 

func (mac MAC) String() string

type MACStatus added in v1.1.0 

type MACStatus struct {
	Mac      string
	Name     string
	NickName string
	LastSeen time.Time
}

func NewMACStatusSlice added in v1.1.0 

func NewMACStatusSlice(cache *MacCache) []MACStatus

type MacCache 

type MacCache struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewMacCache 

func NewMacCache(maxAge time.Duration, onExpiry func(net.HardwareAddr, *Peer)) *MacCache

func (*MacCache) Add added in v1.2.0 

func (cache *MacCache) Add(mac net.HardwareAddr, peer *Peer) (bool, *Peer)

func (*MacCache) AddForced added in v1.2.0 

func (cache *MacCache) AddForced(mac net.HardwareAddr, peer *Peer) (bool, *Peer)

func (*MacCache) Delete 

func (cache *MacCache) Delete(peer *Peer) bool

func (*MacCache) Lookup 

func (cache *MacCache) Lookup(mac net.HardwareAddr) *Peer

type MacCacheEntry 

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

type MultiFlowOp added in v1.2.0 

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

func NewMultiFlowOp added in v1.2.0 

func NewMultiFlowOp(broadcast bool, ops ...FlowOp) *MultiFlowOp

func (*MultiFlowOp) Add added in v1.2.0 

func (mfop *MultiFlowOp) Add(op FlowOp)

func (*MultiFlowOp) Discards added in v1.2.0 

func (mfop *MultiFlowOp) Discards() bool

func (*MultiFlowOp) Process added in v1.2.0 

func (mfop *MultiFlowOp) Process(frame []byte, dec *EthernetDecoder,
	broadcast bool)

type NaClDecryptor 

type NaClDecryptor struct {
	NonDecryptor
	// contains filtered or unexported fields
}

func NewNaClDecryptor 

func NewNaClDecryptor(sessionKey *[32]byte, outbound bool) *NaClDecryptor

func (*NaClDecryptor) IterateFrames 

func (nd *NaClDecryptor) IterateFrames(packet []byte, consumer FrameConsumer) error

type NaClDecryptorInstance 

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

func NewNaClDecryptorInstance added in v0.11.0 

func NewNaClDecryptorInstance(outbound bool) *NaClDecryptorInstance

type NaClEncryptor 

type NaClEncryptor struct {
	NonEncryptor
	// contains filtered or unexported fields
}

func NewNaClEncryptor 

func NewNaClEncryptor(prefix []byte, sessionKey *[32]byte, outbound bool, df bool) *NaClEncryptor

func (*NaClEncryptor) Bytes 

func (ne *NaClEncryptor) Bytes() ([]byte, error)

func (*NaClEncryptor) PacketOverhead 

func (ne *NaClEncryptor) PacketOverhead() int

func (*NaClEncryptor) TotalLen 

func (ne *NaClEncryptor) TotalLen() int

type NameCollisionError 

type NameCollisionError struct {
	Name PeerName
}

func (NameCollisionError) Error 

func (nce NameCollisionError) Error() string

type NonDecryptor 

type NonDecryptor struct {
}

func NewNonDecryptor 

func NewNonDecryptor() *NonDecryptor

func (*NonDecryptor) IterateFrames 

func (nd *NonDecryptor) IterateFrames(packet []byte, consumer FrameConsumer) error

type NonDiscardingFlowOp added in v1.2.0 

type NonDiscardingFlowOp struct{}

func (NonDiscardingFlowOp) Discards added in v1.2.0 

func (NonDiscardingFlowOp) Discards() bool

type NonEncryptor 

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

func NewNonEncryptor 

func NewNonEncryptor(prefix []byte) *NonEncryptor

func (*NonEncryptor) AppendFrame 

func (ne *NonEncryptor) AppendFrame(src []byte, dst []byte, frame []byte)

func (*NonEncryptor) Bytes 

func (ne *NonEncryptor) Bytes() ([]byte, error)

func (*NonEncryptor) FrameOverhead 

func (ne *NonEncryptor) FrameOverhead() int

func (*NonEncryptor) PacketOverhead 

func (ne *NonEncryptor) PacketOverhead() int

func (*NonEncryptor) TotalLen 

func (ne *NonEncryptor) TotalLen() int

type NullBridge added in v1.2.0 

type NullBridge struct{}

func (NullBridge) InjectPacket added in v1.2.0 

func (NullBridge) InjectPacket(PacketKey) FlowOp

func (NullBridge) StartConsumingPackets added in v1.2.0 

func (NullBridge) StartConsumingPackets(BridgeConsumer) error

func (NullBridge) Stats added in v1.2.0 

func (NullBridge) Stats() map[string]int

func (NullBridge) String added in v1.2.0 

func (NullBridge) String() string

type NullOverlay added in v1.2.0 

type NullOverlay struct{}

func (NullOverlay) AddFeaturesTo added in v1.2.0 

func (NullOverlay) AddFeaturesTo(map[string]string)

func (NullOverlay) Confirm added in v1.2.0 

func (NullOverlay) Confirm()

func (NullOverlay) ControlMessage added in v1.2.0 

func (NullOverlay) ControlMessage(byte, []byte)

func (NullOverlay) Diagnostics added in v1.2.0 

func (NullOverlay) Diagnostics() interface{}

func (NullOverlay) DisplayName added in v1.2.0 

func (NullOverlay) DisplayName() string

func (NullOverlay) ErrorChannel added in v1.2.0 

func (NullOverlay) ErrorChannel() <-chan error

func (NullOverlay) EstablishedChannel added in v1.2.0 

func (NullOverlay) EstablishedChannel() <-chan struct{}

func (NullOverlay) Forward added in v1.2.0 

func (NullOverlay) Forward(ForwardPacketKey) FlowOp

func (NullOverlay) InvalidateRoutes added in v1.2.0 

func (NullOverlay) InvalidateRoutes()

func (NullOverlay) InvalidateShortIDs added in v1.2.0 

func (NullOverlay) InvalidateShortIDs()

func (NullOverlay) MakeForwarder added in v1.2.0 

func (NullOverlay) MakeForwarder(ForwarderParams) (OverlayForwarder, error)

func (NullOverlay) StartConsumingPackets added in v1.2.0 

func (NullOverlay) StartConsumingPackets(*Peer, *Peers, OverlayConsumer) error

func (NullOverlay) Stop added in v1.2.0 

func (NullOverlay) Stop()

type Overlay added in v1.2.0 

type Overlay interface {
	// Start consuming forwarded packets.
	StartConsumingPackets(*Peer, *Peers, OverlayConsumer) error

	// Form a packet-forwarding connection.
	MakeForwarder(ForwarderParams) (OverlayForwarder, error)

	// The routes have changed, so any cached information should
	// be discarded.
	InvalidateRoutes()

	// A mapping of a short id to a peer has changed
	InvalidateShortIDs()

	// Enhance a features map with overlay-related features
	AddFeaturesTo(map[string]string)

	// Obtain diagnostic information specific to the overlay
	Diagnostics() interface{}
}

Interface to overlay network packet handling

func NewSleeveOverlay added in v1.2.0 

func NewSleeveOverlay(localPort int) Overlay

type OverlayConsumer added in v1.2.0 

type OverlayConsumer func(ForwardPacketKey) FlowOp

When a consumer is called, the decoder will already have been used to decode the frame.

type OverlayCrypto added in v1.2.0 

type OverlayCrypto struct {
	Dec   Decryptor
	Enc   Encryptor
	EncDF Encryptor
}

Crypto settings for a forwarder.

type OverlayForwarder added in v1.2.0 

type OverlayForwarder interface {
	// Forward a packet across the connection.  May be called as
	// soon as the forwarder is created, in particular before
	// Confirm().  The return value nil means the key could not be
	// handled by this forwarder.
	Forward(ForwardPacketKey) FlowOp

	// Confirm that the connection is really wanted, and so the
	// Overlay should begin heartbeats etc. to verify the
	// operation of the forwarder.
	Confirm()

	// A channel indicating that the forwarder is established,
	// i.e. its operation has been confirmed.
	EstablishedChannel() <-chan struct{}

	// A channel indicating an error from the forwarder.  The
	// forwarder is not expected to be operational after the first
	// error, so the channel only needs to buffer a single error.
	ErrorChannel() <-chan error

	Stop()

	// Handle a message from the peer.  'tag' exists for
	// compatibility, and should always be
	// ProtocolOverlayControlMessage for non-sleeve overlays.
	ControlMessage(tag byte, msg []byte)

	// User facing overlay name
	DisplayName() string
}

All of the machinery to forward packets to a particular peer

type OverlaySwitch added in v1.2.0 

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

func NewOverlaySwitch added in v1.2.0 

func NewOverlaySwitch() *OverlaySwitch

func (*OverlaySwitch) Add added in v1.2.0 

func (osw *OverlaySwitch) Add(name string, overlay Overlay)

func (*OverlaySwitch) AddFeaturesTo added in v1.2.0 

func (osw *OverlaySwitch) AddFeaturesTo(features map[string]string)

func (*OverlaySwitch) Diagnostics added in v1.2.0 

func (osw *OverlaySwitch) Diagnostics() interface{}

func (*OverlaySwitch) InvalidateRoutes added in v1.2.0 

func (osw *OverlaySwitch) InvalidateRoutes()

func (*OverlaySwitch) InvalidateShortIDs added in v1.2.0 

func (osw *OverlaySwitch) InvalidateShortIDs()

func (*OverlaySwitch) MakeForwarder added in v1.2.0 

func (osw *OverlaySwitch) MakeForwarder(
	params ForwarderParams) (OverlayForwarder, error)

func (*OverlaySwitch) SetCompatOverlay added in v1.2.0 

func (osw *OverlaySwitch) SetCompatOverlay(overlay Overlay)

func (*OverlaySwitch) StartConsumingPackets added in v1.2.0 

func (osw *OverlaySwitch) StartConsumingPackets(localPeer *Peer, peers *Peers,
	consumer OverlayConsumer) error

type PacketDecodingError 

type PacketDecodingError struct {
	Desc string
}

func (PacketDecodingError) Error 

func (pde PacketDecodingError) Error() string

type PacketKey added in v1.2.0 

type PacketKey struct {
	SrcMAC MAC
	DstMAC MAC
}

type PacketLogging added in v1.2.0 

type PacketLogging interface {
	LogPacket(string, PacketKey)
	LogForwardPacket(string, ForwardPacketKey)
}

type Pcap added in v1.2.0 

type Pcap struct {
	NonDiscardingFlowOp
	// contains filtered or unexported fields
}

func (*Pcap) InjectPacket added in v1.2.0 

func (p *Pcap) InjectPacket(PacketKey) FlowOp

func (*Pcap) Process added in v1.2.0 

func (p *Pcap) Process(frame []byte, dec *EthernetDecoder, broadcast bool)

func (*Pcap) StartConsumingPackets added in v1.2.0 

func (p *Pcap) StartConsumingPackets(consumer BridgeConsumer) error

func (*Pcap) Stats added in v1.2.0 

func (p *Pcap) Stats() map[string]int

func (*Pcap) String added in v1.2.0 

func (p *Pcap) String() string

type Peer 

type Peer struct {
	Name PeerName
	PeerSummary
	// contains filtered or unexported fields
}

func NewPeer 

func NewPeer(name PeerName, nickName string, uid PeerUID, version uint64, shortID PeerShortID) *Peer

func NewPeerFrom added in v1.2.0 

func NewPeerFrom(peer *Peer) *Peer

func NewPeerFromSummary added in v1.2.0 

func NewPeerFromSummary(summary PeerSummary) *Peer

func (*Peer) Encode added in v0.11.0 

func (peer *Peer) Encode(enc *gob.Encoder)

func (*Peer) ForEachConnectedPeer added in v0.11.0 

func (peer *Peer) ForEachConnectedPeer(establishedAndSymmetric bool, exclude map[PeerName]PeerName, f func(*Peer))

func (*Peer) Routes 

func (peer *Peer) Routes(stopAt *Peer, establishedAndSymmetric bool) (bool, map[PeerName]PeerName)

Calculate the routing table from this peer to all peers reachable from it, returning a "next hop" map of PeerNameX -> PeerNameY, which says "in order to send a message to X, the peer should send the message to its neighbour Y".

Because currently we do not have weightings on the connections between peers, there is no need to use a minimum spanning tree algorithm. Instead we employ the simpler and cheaper breadth-first widening. The computation is deterministic, which ensures that when it is performed on the same data by different peers, they get the same result. This is important since otherwise we risk message loss or routing cycles.

When the 'establishedAndSymmetric' flag is set, only connections that are marked as 'established' and are symmetric (i.e. where both sides indicate they have a connection to the other) are considered.

When a non-nil stopAt peer is supplied, the widening stops when it reaches that peer. The boolean return indicates whether that has happened.

NB: This function should generally be invoked while holding a read lock on Peers and LocalPeer.

func (*Peer) String 

func (peer *Peer) String() string

type PeerName 

type PeerName uint64

PeerName is used as a map key. Since net.HardwareAddr isn't suitable for that - it's a slice, and slices can't be map keys - we convert that to/from uint64.

func PeerNameFromBin 

func PeerNameFromBin(nameByte []byte) PeerName

func PeerNameFromString 

func PeerNameFromString(nameStr string) (PeerName, error)

func PeerNameFromUserInput 

func PeerNameFromUserInput(userInput string) (PeerName, error)

func (PeerName) Bin 

func (name PeerName) Bin() []byte

func (PeerName) String 

func (name PeerName) String() string

type PeerNameSet added in v0.10.0 

type PeerNameSet map[PeerName]struct{}

type PeerShortID added in v1.2.0 

type PeerShortID uint16

Short IDs exist for the sake of fast datapath. They are 12 bits, randomly assigned, but we detect and recover from collisions. This does limit us to 4096 peers, but that should be sufficient for a while.

type PeerStatus added in v1.1.0 

type PeerStatus struct {
	Name        string
	NickName    string
	UID         PeerUID
	ShortID     PeerShortID
	Version     uint64
	Connections []ConnectionStatus
}

func NewPeerStatusSlice added in v1.1.0 

func NewPeerStatusSlice(peers *Peers) []PeerStatus

type PeerSummary added in v0.11.0 

type PeerSummary struct {
	NameByte   []byte
	NickName   string
	UID        PeerUID
	Version    uint64
	ShortID    PeerShortID
	HasShortID bool
}

type PeerUID added in v0.11.0 

type PeerUID uint64

func ParsePeerUID added in v0.11.0 

func ParsePeerUID(s string) (PeerUID, error)

type Peers 

type Peers struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewPeers 

func NewPeers(ourself *LocalPeer) *Peers

func (*Peers) ApplyUpdate 

func (peers *Peers) ApplyUpdate(update []byte) (PeerNameSet, PeerNameSet, error)

Merge an incoming update with our own topology.

We add peers hitherto unknown to us, and update peers for which the update contains a more recent version than known to us. The return value is a) a representation of the received update, and b) an "improved" update containing just these new/updated elements.

func (*Peers) Dereference added in v0.11.0 

func (peers *Peers) Dereference(peer *Peer)

func (*Peers) EncodePeers added in v0.10.0 

func (peers *Peers) EncodePeers(names PeerNameSet) []byte

func (*Peers) Fetch 

func (peers *Peers) Fetch(name PeerName) *Peer

func (*Peers) FetchAndAddRef added in v1.1.0 

func (peers *Peers) FetchAndAddRef(name PeerName) *Peer

func (*Peers) FetchByShortID added in v1.2.0 

func (peers *Peers) FetchByShortID(shortID PeerShortID) *Peer

func (*Peers) FetchWithDefault 

func (peers *Peers) FetchWithDefault(peer *Peer) *Peer

func (*Peers) ForEach 

func (peers *Peers) ForEach(fun func(*Peer))

func (*Peers) GarbageCollect 

func (peers *Peers) GarbageCollect()

func (*Peers) Names added in v0.10.0 

func (peers *Peers) Names() PeerNameSet

func (*Peers) OnGC added in v1.1.0 

func (peers *Peers) OnGC(callback func(*Peer))

func (*Peers) OnInvalidateShortIDs added in v1.2.0 

func (peers *Peers) OnInvalidateShortIDs(callback func())

type PeersPendingNotifications added in v1.2.0 

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

Pending notifications due to changes to Peers that need to be sent out once the Peers is unlocked.

type ProtocolIntroConn added in v1.1.0 

type ProtocolIntroConn interface {
	// io.Reader
	Read(b []byte) (n int, err error)

	// io.Writer
	Write(b []byte) (n int, err error)

	// net.Conn's deadline methods
	SetDeadline(t time.Time) error
	SetReadDeadline(t time.Time) error
	SetWriteDeadline(t time.Time) error
}

We don't need the full net.TCPConn to do the protocol intro. This interface contains just the parts we do need, to support testing

type ProtocolIntroParams added in v1.1.0 

type ProtocolIntroParams struct {
	MinVersion byte
	MaxVersion byte
	Features   map[string]string
	Conn       ProtocolIntroConn
	Password   []byte
	Outbound   bool
}

func (ProtocolIntroParams) DoIntro added in v1.1.0 

func (params ProtocolIntroParams) DoIntro() (res ProtocolIntroResults, err error)

type ProtocolIntroResults added in v1.1.0 

type ProtocolIntroResults struct {
	Features   map[string]string
	Receiver   TCPReceiver
	Sender     TCPSender
	SessionKey *[32]byte
	Version    byte
}

type ProtocolMsg added in v0.9.0 

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

type ProtocolSender added in v0.9.0 

type ProtocolSender interface {
	SendProtocolMsg(m ProtocolMsg)
}

type ProtocolTag added in v0.9.0 

type ProtocolTag byte

type RemoteConnection 

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

func NewRemoteConnection 

func NewRemoteConnection(from, to *Peer, tcpAddr string, outbound bool, established bool) *RemoteConnection

func (*RemoteConnection) BreakTie added in v0.9.0 

func (conn *RemoteConnection) BreakTie(Connection) ConnectionTieBreak

func (*RemoteConnection) ErrorLog added in v1.1.0 

func (conn *RemoteConnection) ErrorLog(args ...interface{})

func (*RemoteConnection) Established 

func (conn *RemoteConnection) Established() bool

func (*RemoteConnection) Local 

func (conn *RemoteConnection) Local() *Peer

func (*RemoteConnection) Log added in v0.10.0 

func (conn *RemoteConnection) Log(args ...interface{})

func (*RemoteConnection) Outbound added in v0.10.0 

func (conn *RemoteConnection) Outbound() bool

func (*RemoteConnection) Remote 

func (conn *RemoteConnection) Remote() *Peer

func (*RemoteConnection) RemoteTCPAddr 

func (conn *RemoteConnection) RemoteTCPAddr() string

func (*RemoteConnection) Shutdown 

func (conn *RemoteConnection) Shutdown(error)

type Router 

type Router struct {
	Config
	Ourself         *LocalPeer
	Macs            *MacCache
	Peers           *Peers
	Routes          *Routes
	ConnectionMaker *ConnectionMaker

	TopologyGossip Gossip
	UDPListener    *net.UDPConn
	// contains filtered or unexported fields
}

func NewRouter 

func NewRouter(config Config, name PeerName, nickName string) *Router

func (*Router) BroadcastTopologyUpdate added in v1.2.0 

func (router *Router) BroadcastTopologyUpdate(update []*Peer)

func (*Router) Gossip added in v0.9.0 

func (router *Router) Gossip() GossipData

func (*Router) HandleHTTP added in v1.1.0 

func (router *Router) HandleHTTP(muxRouter *mux.Router)

func (*Router) NewGossip added in v0.9.0 

func (router *Router) NewGossip(channelName string, g Gossiper) Gossip

func (*Router) OnGossip added in v0.9.0 

func (router *Router) OnGossip(update []byte) (GossipData, error)

func (*Router) OnGossipBroadcast added in v0.9.0 

func (router *Router) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error)

func (*Router) OnGossipUnicast added in v0.9.0 

func (router *Router) OnGossipUnicast(sender PeerName, msg []byte) error

func (*Router) SendAllGossip added in v0.9.0 

func (router *Router) SendAllGossip()

func (*Router) SendAllGossipDown added in v0.9.0 

func (router *Router) SendAllGossipDown(conn Connection)

func (*Router) Start 

func (router *Router) Start()

Start listening for TCP connections, locally captured packets, and forwarded packets. This is separate from NewRouter so that gossipers can register before we start forming connections.

func (*Router) Stop added in v0.11.0 

func (router *Router) Stop() error

func (*Router) UsingPassword 

func (router *Router) UsingPassword() bool

type Routes 

type Routes struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

func NewRoutes added in v0.9.0 

func NewRoutes(ourself *LocalPeer, peers *Peers, onChange func()) *Routes

func (*Routes) Broadcast 

func (routes *Routes) Broadcast(name PeerName) []PeerName

func (*Routes) BroadcastAll added in v0.10.0 

func (routes *Routes) BroadcastAll(name PeerName) []PeerName

func (*Routes) EnsureRecalculated added in v0.10.0 

func (routes *Routes) EnsureRecalculated()

Wait for any preceding Recalculate requests to be processed.

func (*Routes) PeerNames added in v0.10.0 

func (routes *Routes) PeerNames() PeerNameSet

func (*Routes) RandomNeighbours added in v0.10.0 

func (routes *Routes) RandomNeighbours(except PeerName) PeerNameSet

Choose min(log2(n_peers), n_neighbouring_peers) neighbours, with a random distribution that is topology-sensitive, favouring neighbours at the end of "bottleneck links". We determine the latter based on the unicast routing table. If a neighbour appears as the value more frequently than others - meaning that we reach a higher proportion of peers via that neighbour than other neighbours - then it is chosen with a higher probability.

Note that we choose log2(n_peers) *neighbours*, not peers. Consequently, on sparsely connected peers this function returns a higher proportion of neighbours than elsewhere. In extremis, on peers with fewer than log2(n_peers) neighbours, all neighbours are returned.

func (*Routes) Recalculate 

func (routes *Routes) Recalculate()

Request recalculation of the routing table. This is async but can effectively be made synchronous with a subsequent call to EnsureRecalculated.

func (*Routes) Unicast 

func (routes *Routes) Unicast(name PeerName) (PeerName, bool)

func (*Routes) UnicastAll added in v0.10.0 

func (routes *Routes) UnicastAll(name PeerName) (PeerName, bool)

type ShortIDPeers added in v1.2.0 

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

type SleeveOverlay added in v1.2.0 

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

func (*SleeveOverlay) AddFeaturesTo added in v1.2.0 

func (*SleeveOverlay) AddFeaturesTo(map[string]string)

func (*SleeveOverlay) Diagnostics added in v1.2.0 

func (*SleeveOverlay) Diagnostics() interface{}

func (*SleeveOverlay) InvalidateRoutes added in v1.2.0 

func (*SleeveOverlay) InvalidateRoutes()

func (*SleeveOverlay) InvalidateShortIDs added in v1.2.0 

func (*SleeveOverlay) InvalidateShortIDs()

func (*SleeveOverlay) MakeForwarder added in v1.2.0 

func (sleeve *SleeveOverlay) MakeForwarder(params ForwarderParams) (OverlayForwarder, error)

func (*SleeveOverlay) StartConsumingPackets added in v1.2.0 

func (sleeve *SleeveOverlay) StartConsumingPackets(localPeer *Peer, peers *Peers,
	consumer OverlayConsumer) error

type Status added in v1.1.0 

type Status struct {
	Protocol           string
	ProtocolMinVersion int
	ProtocolMaxVersion int
	Encryption         bool
	PeerDiscovery      bool
	Name               string
	NickName           string
	Port               int
	Interface          string
	CaptureStats       map[string]int
	MACs               []MACStatus
	Peers              []PeerStatus
	UnicastRoutes      []UnicastRouteStatus
	BroadcastRoutes    []BroadcastRouteStatus
	Connections        []LocalConnectionStatus
	Targets            []string
	OverlayDiagnostics interface{}
}

func NewStatus added in v1.1.0 

func NewStatus(router *Router) *Status

type SurrogateGossipData added in v1.0.0 

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

func NewSurrogateGossipData added in v1.0.0 

func NewSurrogateGossipData(msg []byte) *SurrogateGossipData

func (*SurrogateGossipData) Encode added in v1.0.0 

func (d *SurrogateGossipData) Encode() [][]byte

func (*SurrogateGossipData) Merge added in v1.0.0 

func (d *SurrogateGossipData) Merge(other GossipData)

type SurrogateGossiper added in v1.0.0 

type SurrogateGossiper struct{}

func (*SurrogateGossiper) Gossip added in v1.0.0 

func (*SurrogateGossiper) Gossip() GossipData

func (*SurrogateGossiper) OnGossip added in v1.0.0 

func (*SurrogateGossiper) OnGossip(update []byte) (GossipData, error)

func (*SurrogateGossiper) OnGossipBroadcast added in v1.0.0 

func (*SurrogateGossiper) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error)

func (*SurrogateGossiper) OnGossipUnicast added in v1.0.0 

func (*SurrogateGossiper) OnGossipUnicast(sender PeerName, msg []byte) error

type TCPCryptoState added in v0.11.0 

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

The lowest 64 bits of the nonce contain the message sequence number. The top most bit indicates the connection polarity at the sender - '1' for outbound; the next indicates protocol type - '1' for TCP. The remaining 126 bits are zero. The polarity is needed so that the two ends of a connection do not use the same nonces; the protocol type so that the TCP and UDP sender nonces are disjoint. This is a requirement of the NaCl Security Model; see http://nacl.cr.yp.to/box.html.

func NewTCPCryptoState added in v0.11.0 

func NewTCPCryptoState(sessionKey *[32]byte, outbound bool) *TCPCryptoState

type TCPReceiver 

type TCPReceiver interface {
	Receive() ([]byte, error)
}

type TCPSender 

type TCPSender interface {
	Send([]byte) error
}

type Target 

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

Information about an address where we may find a peer

type TargetState added in v1.2.0 

type TargetState int
const (
	TargetWaiting    TargetState = iota // we are waiting to connect there
	TargetAttempting                    // we are attempting to connect there
	TargetConnected                     // we are connected to there
)

type TokenBucket added in v1.0.2 

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

func NewTokenBucket added in v1.0.2 

func NewTokenBucket(capacity int64, tokenInterval time.Duration) *TokenBucket

func (*TokenBucket) Wait added in v1.0.2 

func (tb *TokenBucket) Wait()

type TopologyGossipData added in v0.10.0 

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

func (*TopologyGossipData) Encode added in v0.10.0 

func (d *TopologyGossipData) Encode() [][]byte

func (*TopologyGossipData) Merge added in v0.10.0 

func (d *TopologyGossipData) Merge(other GossipData)

type UnicastRouteStatus added in v1.1.0 

type UnicastRouteStatus struct {
	Dest, Via string
}

func NewUnicastRouteStatusSlice added in v1.1.0 

func NewUnicastRouteStatusSlice(routes *Routes) []UnicastRouteStatus

type UnknownPeerError added in v0.9.0 

type UnknownPeerError struct {
	Name PeerName
}

func (UnknownPeerError) Error added in v0.9.0 

func (upe UnknownPeerError) Error() string

type VportStatus added in v1.2.0 

type VportStatus odp.Vport

func (*VportStatus) MarshalJSON added in v1.2.0 

func (vport *VportStatus) MarshalJSON() ([]byte, error)

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