mirror of
https://github.com/SagerNet/sing-tun.git
synced 2025-04-04 20:37:43 +03:00
123 lines
2.9 KiB
Go
123 lines
2.9 KiB
Go
//go:build with_gvisor && freebsd
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package tun
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import (
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"github.com/sagernet/gvisor/pkg/buffer"
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"github.com/sagernet/gvisor/pkg/tcpip"
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"github.com/sagernet/gvisor/pkg/tcpip/header"
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"github.com/sagernet/gvisor/pkg/tcpip/stack"
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"github.com/sagernet/sing/common/bufio"
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)
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var _ GVisorTun = (*NativeTun)(nil)
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func (t *NativeTun) NewEndpoint() (stack.LinkEndpoint, error) {
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return &FreeBSDEndpoint{tun: t}, nil
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}
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var _ stack.LinkEndpoint = (*FreeBSDEndpoint)(nil)
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type FreeBSDEndpoint struct {
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tun *NativeTun
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dispatcher stack.NetworkDispatcher
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}
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func (e *FreeBSDEndpoint) Attach(dispatcher stack.NetworkDispatcher) {
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if dispatcher == nil && e.dispatcher != nil {
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e.dispatcher = nil
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return
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}
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if dispatcher != nil && e.dispatcher == nil {
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e.dispatcher = dispatcher
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go e.dispatchLoop()
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}
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}
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func (e *FreeBSDEndpoint) dispatchLoop() {
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packetBuffer := make([]byte, IFHEADOffset+e.tun.mtu)
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for {
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n, err := e.tun.tunFile.Read(packetBuffer)
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if err != nil {
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break
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}
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// remove IFHEAD here
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packet := packetBuffer[IFHEADOffset:n]
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var networkProtocol tcpip.NetworkProtocolNumber
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switch header.IPVersion(packet) {
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case header.IPv4Version:
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networkProtocol = header.IPv4ProtocolNumber
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if header.IPv4(packet).DestinationAddress().As4() == e.tun.inet4Address {
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e.tun.tunFile.Write(packetBuffer[:n])
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continue
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}
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case header.IPv6Version:
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networkProtocol = header.IPv6ProtocolNumber
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if header.IPv6(packet).DestinationAddress().As16() == e.tun.inet6Address {
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e.tun.tunFile.Write(packetBuffer[:n])
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continue
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}
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default:
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e.tun.tunFile.Write(packetBuffer[:n])
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continue
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}
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pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{
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Payload: buffer.MakeWithData(packetBuffer[IFHEADOffset:n]),
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IsForwardedPacket: true,
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})
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pkt.NetworkProtocolNumber = networkProtocol
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dispatcher := e.dispatcher
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if dispatcher == nil {
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pkt.DecRef()
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return
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}
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dispatcher.DeliverNetworkPacket(networkProtocol, pkt)
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pkt.DecRef()
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}
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}
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func (e *FreeBSDEndpoint) IsAttached() bool {
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return e.dispatcher != nil
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}
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func (e *FreeBSDEndpoint) Wait() {
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}
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func (e *FreeBSDEndpoint) Capabilities() stack.LinkEndpointCapabilities {
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return stack.CapabilityRXChecksumOffload
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}
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func (e *FreeBSDEndpoint) ARPHardwareType() header.ARPHardwareType {
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return header.ARPHardwareNone
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}
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func (e *FreeBSDEndpoint) AddHeader(buffer stack.PacketBufferPtr) {
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}
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func (e *FreeBSDEndpoint) ParseHeader(ptr stack.PacketBufferPtr) bool {
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return true
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}
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func (e *FreeBSDEndpoint) MTU() uint32 {
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return e.tun.mtu
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}
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func (e *FreeBSDEndpoint) MaxHeaderLength() uint16 {
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return 0
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}
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func (e *FreeBSDEndpoint) LinkAddress() tcpip.LinkAddress {
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return ""
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}
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func (e *FreeBSDEndpoint) WritePackets(packetBufferList stack.PacketBufferList) (int, tcpip.Error) {
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var n int
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for _, packet := range packetBufferList.AsSlice() {
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_, err := bufio.WriteVectorised(e.tun, packet.AsSlices())
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if err != nil {
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return n, &tcpip.ErrAborted{}
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}
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n++
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}
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return n, nil
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}
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