conn

Documentation

Overview

Package conn implements WireGuard's network connections.

Index

• Constants
• Variables
• type Bind
  • func NewDefaultBind() Bind
  • func NewStdNetBind() Bind
• type BindSocketToInterface
• type Endpoint
• type ErrUDPGSODisabled
  • func (e ErrUDPGSODisabled) Error() string
  • func (e ErrUDPGSODisabled) Unwrap() error
• type PeekLookAtSocketFd
• type ReceiveFunc
  • func (fn ReceiveFunc) PrettyName() string
• type StdNetBind
  • func (s *StdNetBind) BatchSize() int
  • func (s *StdNetBind) Close() error
  • func (bind *StdNetBind) Get_extra_data() (string, []byte, int, int, int, int, int, int)
  • func (s *StdNetBind) Open(uport uint16) ([]ReceiveFunc, uint16, error)
  • func (*StdNetBind) ParseEndpoint(s string) (Endpoint, error)
  • func (s *StdNetBind) Send(bufs [][]byte, endpoint Endpoint) error
  • func (s *StdNetBind) Send_without_modify(bufs [][]byte, endpoint Endpoint) error
  • func (s *StdNetBind) SetMark(mark uint32) error
• type StdNetEndpoint
  • func (e *StdNetEndpoint) ClearSrc()
  • func (e *StdNetEndpoint) DstIP() netip.Addr
  • func (e *StdNetEndpoint) DstToBytes() []byte
  • func (e *StdNetEndpoint) DstToString() string
  • func (e *StdNetEndpoint) SrcIP() netip.Addr
  • func (e *StdNetEndpoint) SrcIfidx() int32
  • func (e *StdNetEndpoint) SrcToString() string

Constants

const (
	IdealBatchSize = 128 // maximum number of packets handled per read and write
)

const StdNetSupportsStickySockets = true

Variables

var (
	ErrBindAlreadyOpen   = errors.New("bind is already open")
	ErrWrongEndpointType = errors.New("endpoint type does not correspond with bind type")
)

Types

type Bind

type Bind interface {
	// Open puts the Bind into a listening state on a given port and reports the actual
	// port that it bound to. Passing zero results in a random selection.
	// fns is the set of functions that will be called to receive packets.
	Open(port uint16) (fns []ReceiveFunc, actualPort uint16, err error)

	// Close closes the Bind listener.
	// All fns returned by Open must return net.ErrClosed after a call to Close.
	Close() error

	// SetMark sets the mark for each packet sent through this Bind.
	// This mark is passed to the kernel as the socket option SO_MARK.
	SetMark(mark uint32) error

	// Send writes one or more packets in bufs to address ep. The length of
	// bufs must not exceed BatchSize().
	Send(bufs [][]byte, ep Endpoint) error

	// GFW-knocker
	Send_without_modify(bufs [][]byte, ep Endpoint) error
	Get_extra_data() (string, []byte, int, int, int, int, int, int)

	// ParseEndpoint creates a new endpoint from a string.
	ParseEndpoint(s string) (Endpoint, error)

	// BatchSize is the number of buffers expected to be passed to
	// the ReceiveFuncs, and the maximum expected to be passed to SendBatch.
	BatchSize() int
}

A Bind listens on a port for both IPv6 and IPv4 UDP traffic.

A Bind interface may also be a PeekLookAtSocketFd or BindSocketToInterface, depending on the platform-specific implementation.

func NewDefaultBind

func NewDefaultBind() Bind

func NewStdNetBind

func NewStdNetBind() Bind

type BindSocketToInterface

type BindSocketToInterface interface {
	BindSocketToInterface4(interfaceIndex uint32, blackhole bool) error
	BindSocketToInterface6(interfaceIndex uint32, blackhole bool) error
}

BindSocketToInterface is implemented by Bind objects that support being tied to a single network interface. Used by wireguard-windows.

type Endpoint

type Endpoint interface {
	ClearSrc()           // clears the source address
	SrcToString() string // returns the local source address (ip:port)
	DstToString() string // returns the destination address (ip:port)
	DstToBytes() []byte  // used for mac2 cookie calculations
	DstIP() netip.Addr
	SrcIP() netip.Addr
}

An Endpoint maintains the source/destination caching for a peer.

dst: the remote address of a peer ("endpoint" in uapi terminology)
src: the local address from which datagrams originate going to the peer

type ErrUDPGSODisabled

type ErrUDPGSODisabled struct {
	RetryErr error
	// contains filtered or unexported fields
}

func (ErrUDPGSODisabled) Error

func (e ErrUDPGSODisabled) Error() string

func (ErrUDPGSODisabled) Unwrap

func (e ErrUDPGSODisabled) Unwrap() error

type PeekLookAtSocketFd

type PeekLookAtSocketFd interface {
	PeekLookAtSocketFd4() (fd int, err error)
	PeekLookAtSocketFd6() (fd int, err error)
}

PeekLookAtSocketFd is implemented by Bind objects that support having their file descriptor peeked at. Used by wireguard-android.

type ReceiveFunc

type ReceiveFunc func(packets [][]byte, sizes []int, eps []Endpoint) (n int, err error)

A ReceiveFunc receives at least one packet from the network and writes them into packets. On a successful read it returns the number of elements of sizes, packets, and endpoints that should be evaluated. Some elements of sizes may be zero, and callers should ignore them. Callers must pass a sizes and eps slice with a length greater than or equal to the length of packets. These lengths must not exceed the length of the associated Bind.BatchSize().

func (ReceiveFunc) PrettyName

func (fn ReceiveFunc) PrettyName() string

type StdNetBind

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

StdNetBind implements Bind for all platforms. While Windows has its own Bind (see bind_windows.go), it may fall back to StdNetBind. TODO: Remove usage of ipv{4,6}.PacketConn when net.UDPConn has comparable methods for sending and receiving multiple datagrams per-syscall. See the proposal in https://github.com/golang/go/issues/45886#issuecomment-1218301564.

func (*StdNetBind) BatchSize

func (s *StdNetBind) BatchSize() int

TODO: When all Binds handle IdealBatchSize, remove this dynamic function and rename the IdealBatchSize constant to BatchSize.

func (*StdNetBind) Close

func (s *StdNetBind) Close() error

func (*StdNetBind) Get_extra_data

func (bind *StdNetBind) Get_extra_data() (string, []byte, int, int, int, int, int, int)

---------------- GFW-knocker ------------------------

func (*StdNetBind) Open

func (s *StdNetBind) Open(uport uint16) ([]ReceiveFunc, uint16, error)

func (*StdNetBind) ParseEndpoint

func (*StdNetBind) ParseEndpoint(s string) (Endpoint, error)

func (*StdNetBind) Send

func (s *StdNetBind) Send(bufs [][]byte, endpoint Endpoint) error

func (*StdNetBind) Send_without_modify

func (s *StdNetBind) Send_without_modify(bufs [][]byte, endpoint Endpoint) error

func (*StdNetBind) SetMark

func (s *StdNetBind) SetMark(mark uint32) error

type StdNetEndpoint

type StdNetEndpoint struct {
	// AddrPort is the endpoint destination.
	netip.AddrPort
	// contains filtered or unexported fields
}

func (*StdNetEndpoint) ClearSrc

func (e *StdNetEndpoint) ClearSrc()

func (*StdNetEndpoint) DstIP

func (e *StdNetEndpoint) DstIP() netip.Addr

func (*StdNetEndpoint) DstToBytes

func (e *StdNetEndpoint) DstToBytes() []byte

func (*StdNetEndpoint) DstToString

func (e *StdNetEndpoint) DstToString() string

func (*StdNetEndpoint) SrcIP

func (e *StdNetEndpoint) SrcIP() netip.Addr

func (*StdNetEndpoint) SrcIfidx

func (e *StdNetEndpoint) SrcIfidx() int32

func (*StdNetEndpoint) SrcToString

func (e *StdNetEndpoint) SrcToString() string