mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-23 17:11:29 +00:00
338 lines
8.4 KiB
Go
338 lines
8.4 KiB
Go
//go:build with_gvisor
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package wireguard
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import (
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"context"
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"net"
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"net/netip"
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"os"
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"github.com/sagernet/sing-tun"
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"github.com/sagernet/sing/common/buf"
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E "github.com/sagernet/sing/common/exceptions"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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wgTun "github.com/sagernet/wireguard-go/tun"
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"gvisor.dev/gvisor/pkg/bufferv2"
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"gvisor.dev/gvisor/pkg/tcpip"
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"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
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"gvisor.dev/gvisor/pkg/tcpip/header"
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"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
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"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
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"gvisor.dev/gvisor/pkg/tcpip/stack"
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"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
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"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
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"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
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)
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var _ NatDevice = (*StackDevice)(nil)
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const defaultNIC tcpip.NICID = 1
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type StackDevice struct {
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stack *stack.Stack
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mtu uint32
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events chan wgTun.Event
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outbound chan *stack.PacketBuffer
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packetOutbound chan *buf.Buffer
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done chan struct{}
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dispatcher stack.NetworkDispatcher
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addr4 tcpip.Address
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addr6 tcpip.Address
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mapping *tun.NatMapping
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writer *tun.NatWriter
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}
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func NewStackDevice(localAddresses []netip.Prefix, mtu uint32, ipRewrite bool) (*StackDevice, error) {
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ipStack := stack.New(stack.Options{
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NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol},
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TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol, icmp.NewProtocol4, icmp.NewProtocol6},
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HandleLocal: true,
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})
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tunDevice := &StackDevice{
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stack: ipStack,
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mtu: mtu,
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events: make(chan wgTun.Event, 1),
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outbound: make(chan *stack.PacketBuffer, 256),
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packetOutbound: make(chan *buf.Buffer, 256),
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done: make(chan struct{}),
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mapping: tun.NewNatMapping(ipRewrite),
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}
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err := ipStack.CreateNIC(defaultNIC, (*wireEndpoint)(tunDevice))
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if err != nil {
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return nil, E.New(err.String())
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}
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for _, prefix := range localAddresses {
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addr := tcpip.Address(prefix.Addr().AsSlice())
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protoAddr := tcpip.ProtocolAddress{
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AddressWithPrefix: tcpip.AddressWithPrefix{
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Address: addr,
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PrefixLen: prefix.Bits(),
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},
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}
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if prefix.Addr().Is4() {
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tunDevice.addr4 = addr
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protoAddr.Protocol = ipv4.ProtocolNumber
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} else {
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tunDevice.addr6 = addr
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protoAddr.Protocol = ipv6.ProtocolNumber
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}
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err = ipStack.AddProtocolAddress(defaultNIC, protoAddr, stack.AddressProperties{})
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if err != nil {
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return nil, E.New("parse local address ", protoAddr.AddressWithPrefix, ": ", err.String())
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}
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}
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if ipRewrite {
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tunDevice.writer = tun.NewNatWriter(tunDevice.Inet4Address(), tunDevice.Inet6Address())
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}
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sOpt := tcpip.TCPSACKEnabled(true)
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ipStack.SetTransportProtocolOption(tcp.ProtocolNumber, &sOpt)
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cOpt := tcpip.CongestionControlOption("cubic")
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ipStack.SetTransportProtocolOption(tcp.ProtocolNumber, &cOpt)
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ipStack.AddRoute(tcpip.Route{Destination: header.IPv4EmptySubnet, NIC: defaultNIC})
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ipStack.AddRoute(tcpip.Route{Destination: header.IPv6EmptySubnet, NIC: defaultNIC})
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return tunDevice, nil
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}
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func (w *StackDevice) NewEndpoint() (stack.LinkEndpoint, error) {
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return (*wireEndpoint)(w), nil
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}
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func (w *StackDevice) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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addr := tcpip.FullAddress{
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NIC: defaultNIC,
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Port: destination.Port,
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Addr: tcpip.Address(destination.Addr.AsSlice()),
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}
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bind := tcpip.FullAddress{
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NIC: defaultNIC,
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}
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var networkProtocol tcpip.NetworkProtocolNumber
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if destination.IsIPv4() {
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networkProtocol = header.IPv4ProtocolNumber
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bind.Addr = w.addr4
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} else {
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networkProtocol = header.IPv6ProtocolNumber
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bind.Addr = w.addr6
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}
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switch N.NetworkName(network) {
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case N.NetworkTCP:
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tcpConn, err := gonet.DialTCPWithBind(ctx, w.stack, bind, addr, networkProtocol)
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if err != nil {
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return nil, err
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}
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return tcpConn, nil
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case N.NetworkUDP:
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udpConn, err := gonet.DialUDP(w.stack, &bind, &addr, networkProtocol)
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if err != nil {
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return nil, err
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}
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return udpConn, nil
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default:
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return nil, E.Extend(N.ErrUnknownNetwork, network)
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}
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}
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func (w *StackDevice) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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bind := tcpip.FullAddress{
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NIC: defaultNIC,
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}
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var networkProtocol tcpip.NetworkProtocolNumber
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if destination.IsIPv4() || w.addr6 == "" {
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networkProtocol = header.IPv4ProtocolNumber
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bind.Addr = w.addr4
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} else {
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networkProtocol = header.IPv6ProtocolNumber
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bind.Addr = w.addr6
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}
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udpConn, err := gonet.DialUDP(w.stack, &bind, nil, networkProtocol)
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if err != nil {
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return nil, err
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}
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return udpConn, nil
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}
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func (w *StackDevice) Inet4Address() netip.Addr {
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return M.AddrFromIP(net.IP(w.addr4))
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}
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func (w *StackDevice) Inet6Address() netip.Addr {
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return M.AddrFromIP(net.IP(w.addr6))
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}
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func (w *StackDevice) Start() error {
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w.events <- wgTun.EventUp
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return nil
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}
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func (w *StackDevice) File() *os.File {
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return nil
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}
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func (w *StackDevice) Read(p []byte, offset int) (n int, err error) {
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select {
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case packetBuffer, ok := <-w.outbound:
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if !ok {
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return 0, os.ErrClosed
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}
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defer packetBuffer.DecRef()
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p = p[offset:]
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for _, slice := range packetBuffer.AsSlices() {
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n += copy(p[n:], slice)
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}
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return
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case packet := <-w.packetOutbound:
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defer packet.Release()
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n = copy(p[offset:], packet.Bytes())
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return
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case <-w.done:
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return 0, os.ErrClosed
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}
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}
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func (w *StackDevice) Write(p []byte, offset int) (n int, err error) {
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p = p[offset:]
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if len(p) == 0 {
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return
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}
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handled, err := w.mapping.WritePacket(p)
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if handled {
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return len(p), err
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}
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var networkProtocol tcpip.NetworkProtocolNumber
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switch header.IPVersion(p) {
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case header.IPv4Version:
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networkProtocol = header.IPv4ProtocolNumber
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case header.IPv6Version:
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networkProtocol = header.IPv6ProtocolNumber
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}
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packetBuffer := stack.NewPacketBuffer(stack.PacketBufferOptions{
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Payload: bufferv2.MakeWithData(p),
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})
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defer packetBuffer.DecRef()
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w.dispatcher.DeliverNetworkPacket(networkProtocol, packetBuffer)
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n = len(p)
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return
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}
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func (w *StackDevice) Flush() error {
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return nil
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}
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func (w *StackDevice) MTU() (int, error) {
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return int(w.mtu), nil
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}
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func (w *StackDevice) Name() (string, error) {
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return "sing-box", nil
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}
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func (w *StackDevice) Events() chan wgTun.Event {
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return w.events
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}
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func (w *StackDevice) Close() error {
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select {
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case <-w.done:
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return os.ErrClosed
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default:
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}
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w.stack.Close()
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for _, endpoint := range w.stack.CleanupEndpoints() {
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endpoint.Abort()
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}
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w.stack.Wait()
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close(w.done)
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return nil
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}
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func (w *StackDevice) CreateDestination(session tun.RouteSession, conn tun.RouteContext) tun.DirectDestination {
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w.mapping.CreateSession(session, conn)
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return &stackNatDestination{
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device: w,
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session: session,
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}
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}
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type stackNatDestination struct {
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device *StackDevice
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session tun.RouteSession
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}
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func (d *stackNatDestination) WritePacket(buffer *buf.Buffer) error {
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if d.device.writer != nil {
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d.device.writer.RewritePacket(buffer.Bytes())
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}
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d.device.packetOutbound <- buffer
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return nil
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}
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func (d *stackNatDestination) WritePacketBuffer(buffer *stack.PacketBuffer) error {
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if d.device.writer != nil {
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d.device.writer.RewritePacketBuffer(buffer)
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}
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d.device.outbound <- buffer
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return nil
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}
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func (d *stackNatDestination) Close() error {
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d.device.mapping.DeleteSession(d.session)
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return nil
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}
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func (d *stackNatDestination) Timeout() bool {
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return false
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}
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var _ stack.LinkEndpoint = (*wireEndpoint)(nil)
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type wireEndpoint StackDevice
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func (ep *wireEndpoint) MTU() uint32 {
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return ep.mtu
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}
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func (ep *wireEndpoint) MaxHeaderLength() uint16 {
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return 0
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}
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func (ep *wireEndpoint) LinkAddress() tcpip.LinkAddress {
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return ""
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}
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func (ep *wireEndpoint) Capabilities() stack.LinkEndpointCapabilities {
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return stack.CapabilityNone
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}
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func (ep *wireEndpoint) Attach(dispatcher stack.NetworkDispatcher) {
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ep.dispatcher = dispatcher
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}
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func (ep *wireEndpoint) IsAttached() bool {
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return ep.dispatcher != nil
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}
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func (ep *wireEndpoint) Wait() {
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}
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func (ep *wireEndpoint) ARPHardwareType() header.ARPHardwareType {
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return header.ARPHardwareNone
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}
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func (ep *wireEndpoint) AddHeader(buffer *stack.PacketBuffer) {
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}
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func (ep *wireEndpoint) WritePackets(list stack.PacketBufferList) (int, tcpip.Error) {
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for _, packetBuffer := range list.AsSlice() {
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packetBuffer.IncRef()
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select {
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case <-ep.done:
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return 0, &tcpip.ErrClosedForSend{}
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case ep.outbound <- packetBuffer:
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}
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}
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return list.Len(), nil
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}
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