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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,227 @@ | ||
| //go:build with_gvisor | ||
|
|
||
| package tun | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "net" | ||
| "os" | ||
| "syscall" | ||
| "time" | ||
|
|
||
| "github.com/sagernet/gvisor/pkg/tcpip" | ||
| "github.com/sagernet/gvisor/pkg/tcpip/adapters/gonet" | ||
| "github.com/sagernet/gvisor/pkg/tcpip/header" | ||
| "github.com/sagernet/gvisor/pkg/tcpip/stack" | ||
| "github.com/sagernet/gvisor/pkg/tcpip/transport/tcp" | ||
| "github.com/sagernet/gvisor/pkg/waiter" | ||
| ) | ||
|
|
||
| type gLazyConn struct { | ||
| tcpConn *gonet.TCPConn | ||
| parentCtx context.Context | ||
| stack *stack.Stack | ||
| request *tcp.ForwarderRequest | ||
| localAddr net.Addr | ||
| remoteAddr net.Addr | ||
| handshakeDone bool | ||
| handshakeErr error | ||
| } | ||
|
|
||
| func (c *gLazyConn) HandshakeContext(ctx context.Context) error { | ||
| if c.handshakeDone { | ||
| return nil | ||
| } | ||
| defer func() { | ||
| c.handshakeDone = true | ||
| }() | ||
| var ( | ||
| wq waiter.Queue | ||
| endpoint tcpip.Endpoint | ||
| ) | ||
| handshakeCtx, cancel := context.WithCancel(ctx) | ||
| go func() { | ||
| select { | ||
| case <-c.parentCtx.Done(): | ||
| wq.Notify(wq.Events()) | ||
| case <-handshakeCtx.Done(): | ||
| } | ||
| }() | ||
| endpoint, err := c.request.CreateEndpoint(&wq) | ||
| cancel() | ||
| if err != nil { | ||
| gErr := gonet.TranslateNetstackError(err) | ||
| c.handshakeErr = gErr | ||
| c.request.Complete(true) | ||
| return gErr | ||
| } | ||
| c.request.Complete(false) | ||
| endpoint.SocketOptions().SetKeepAlive(true) | ||
| keepAliveIdle := tcpip.KeepaliveIdleOption(15 * time.Second) | ||
| endpoint.SetSockOpt(&keepAliveIdle) | ||
| keepAliveInterval := tcpip.KeepaliveIntervalOption(15 * time.Second) | ||
| endpoint.SetSockOpt(&keepAliveInterval) | ||
| tcpConn := gonet.NewTCPConn(&wq, endpoint) | ||
| c.tcpConn = tcpConn | ||
| return nil | ||
| } | ||
|
|
||
| func (c *gLazyConn) HandshakeFailure(err error) error { | ||
| if c.handshakeDone { | ||
| return nil | ||
| } | ||
| wErr := gWriteUnreachable(c.stack, c.request.Packet(), err) | ||
| c.request.Complete(wErr == os.ErrInvalid) | ||
| c.handshakeDone = true | ||
| c.handshakeErr = err | ||
| return nil | ||
| } | ||
|
|
||
| func (c *gLazyConn) HandshakeSuccess() error { | ||
| return c.HandshakeContext(context.Background()) | ||
| } | ||
|
|
||
| func (c *gLazyConn) Read(b []byte) (n int, err error) { | ||
| if !c.handshakeDone { | ||
| err = c.HandshakeContext(context.Background()) | ||
| if err != nil { | ||
| return | ||
| } | ||
| } else if c.handshakeErr != nil { | ||
| return 0, c.handshakeErr | ||
| } | ||
| return c.tcpConn.Read(b) | ||
| } | ||
|
|
||
| func (c *gLazyConn) Write(b []byte) (n int, err error) { | ||
| if !c.handshakeDone { | ||
| err = c.HandshakeContext(context.Background()) | ||
| if err != nil { | ||
| return | ||
| } | ||
| } else if c.handshakeErr != nil { | ||
| return 0, c.handshakeErr | ||
| } | ||
| return c.tcpConn.Write(b) | ||
| } | ||
|
|
||
| func (c *gLazyConn) LocalAddr() net.Addr { | ||
| return c.localAddr | ||
| } | ||
|
|
||
| func (c *gLazyConn) RemoteAddr() net.Addr { | ||
| return c.remoteAddr | ||
| } | ||
|
|
||
| func (c *gLazyConn) SetDeadline(t time.Time) error { | ||
| if !c.handshakeDone { | ||
| err := c.HandshakeContext(context.Background()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } else if c.handshakeErr != nil { | ||
| return c.handshakeErr | ||
| } | ||
| return c.tcpConn.SetDeadline(t) | ||
| } | ||
|
|
||
| func (c *gLazyConn) SetReadDeadline(t time.Time) error { | ||
| if !c.handshakeDone { | ||
| err := c.HandshakeContext(context.Background()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } else if c.handshakeErr != nil { | ||
| return c.handshakeErr | ||
| } | ||
| return c.tcpConn.SetReadDeadline(t) | ||
| } | ||
|
|
||
| func (c *gLazyConn) SetWriteDeadline(t time.Time) error { | ||
| if !c.handshakeDone { | ||
| err := c.HandshakeContext(context.Background()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } else if c.handshakeErr != nil { | ||
| return c.handshakeErr | ||
| } | ||
| return c.tcpConn.SetWriteDeadline(t) | ||
| } | ||
|
|
||
| func (c *gLazyConn) Close() error { | ||
| if !c.handshakeDone { | ||
| c.request.Complete(true) | ||
| c.handshakeErr = net.ErrClosed | ||
| return nil | ||
| } else if c.handshakeErr != nil { | ||
| return nil | ||
| } | ||
| return c.tcpConn.Close() | ||
| } | ||
|
|
||
| func (c *gLazyConn) CloseRead() error { | ||
| if !c.handshakeDone { | ||
| c.request.Complete(true) | ||
| c.handshakeErr = net.ErrClosed | ||
| return nil | ||
| } else if c.handshakeErr != nil { | ||
| return nil | ||
| } | ||
| return c.tcpConn.CloseRead() | ||
| } | ||
|
|
||
| func (c *gLazyConn) CloseWrite() error { | ||
| if !c.handshakeDone { | ||
| c.request.Complete(true) | ||
| c.handshakeErr = net.ErrClosed | ||
| return nil | ||
| } else if c.handshakeErr != nil { | ||
| return nil | ||
| } | ||
| return c.tcpConn.CloseRead() | ||
| } | ||
|
|
||
| func (c *gLazyConn) ReaderReplaceable() bool { | ||
| return c.handshakeDone && c.handshakeErr == nil | ||
| } | ||
|
|
||
| func (c *gLazyConn) WriterReplaceable() bool { | ||
| return c.handshakeDone && c.handshakeErr == nil | ||
| } | ||
|
|
||
| func (c *gLazyConn) Upstream() any { | ||
| return c.tcpConn | ||
| } | ||
|
|
||
| func gWriteUnreachable(gStack *stack.Stack, packet *stack.PacketBuffer, err error) error { | ||
| if errors.Is(err, syscall.ENETUNREACH) { | ||
| if packet.NetworkProtocolNumber == header.IPv4ProtocolNumber { | ||
| return gWriteUnreachable4(gStack, packet, stack.RejectIPv4WithICMPPortUnreachable) | ||
| } else { | ||
| return gWriteUnreachable6(gStack, packet, stack.RejectIPv6WithICMPNoRoute) | ||
| } | ||
| } else if errors.Is(err, syscall.EHOSTUNREACH) { | ||
| if packet.NetworkProtocolNumber == header.IPv4ProtocolNumber { | ||
| return gWriteUnreachable4(gStack, packet, stack.RejectIPv4WithICMPHostProhibited) | ||
| } else { | ||
| return gWriteUnreachable6(gStack, packet, stack.RejectIPv6WithICMPNoRoute) | ||
| } | ||
| } else if errors.Is(err, syscall.ECONNREFUSED) { | ||
| if packet.NetworkProtocolNumber == header.IPv4ProtocolNumber { | ||
| return gWriteUnreachable4(gStack, packet, stack.RejectIPv4WithICMPPortUnreachable) | ||
| } else { | ||
| return gWriteUnreachable6(gStack, packet, stack.RejectIPv6WithICMPPortUnreachable) | ||
| } | ||
| } | ||
| return os.ErrInvalid | ||
| } | ||
|
|
||
| func gWriteUnreachable4(gStack *stack.Stack, packet *stack.PacketBuffer, icmpCode stack.RejectIPv4WithICMPType) error { | ||
| return gonet.TranslateNetstackError(gStack.NetworkProtocolInstance(header.IPv4ProtocolNumber).(stack.RejectIPv4WithHandler).SendRejectionError(packet, icmpCode, true)) | ||
| } | ||
|
|
||
| func gWriteUnreachable6(gStack *stack.Stack, packet *stack.PacketBuffer, icmpCode stack.RejectIPv6WithICMPType) error { | ||
| return gonet.TranslateNetstackError(gStack.NetworkProtocolInstance(header.IPv6ProtocolNumber).(stack.RejectIPv6WithHandler).SendRejectionError(packet, icmpCode, true)) | ||
| } |
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