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Re-implement lazy conns

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This commit is contained in:
世界
2024-11-08 10:29:20 +08:00
parent a5cb9f4f5f
commit b1e2673c21
6 changed files with 231 additions and 33 deletions
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28
stack_gvisor_udp.go
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@@ -60,7 +60,7 @@ func (f *UDPForwarder) PreparePacketConnection(source M.Socksaddr, destination M
pErr := f.handler.PrepareConnection(N.NetworkUDP, source, destination)
if pErr != nil {
if pErr != ErrDrop {
gWriteUnreachable(f.stack, userData.(*stack.PacketBuffer), pErr)
gWriteUnreachable(f.stack, userData.(*stack.PacketBuffer))
}
return false, nil, nil, nil
}
@@ -72,6 +72,7 @@ func (f *UDPForwarder) PreparePacketConnection(source M.Socksaddr, destination M
}
writer := &UDPBackWriter{
stack: f.stack,
packet: userData.(*stack.PacketBuffer).IncRef(),
source: AddressFromAddr(source.Addr),
sourcePort: source.Port,
sourceNetwork: sourceNetwork,
@@ -82,11 +83,34 @@ func (f *UDPForwarder) PreparePacketConnection(source M.Socksaddr, destination M
type UDPBackWriter struct {
access sync.Mutex
stack *stack.Stack
packet *stack.PacketBuffer
source tcpip.Address
sourcePort uint16
sourceNetwork tcpip.NetworkProtocolNumber
}
func (w *UDPBackWriter) HandshakeSuccess() error {
w.access.Lock()
defer w.access.Unlock()
if w.packet != nil {
w.packet.DecRef()
w.packet = nil
}
return nil
}
func (w *UDPBackWriter) HandshakeFailure(err error) error {
w.access.Lock()
defer w.access.Unlock()
if w.packet != nil {
wErr := gWriteUnreachable(w.stack, w.packet)
w.packet.DecRef()
w.packet = nil
return wErr
}
return nil
}
func (w *UDPBackWriter) WritePacket(packetBuffer *buf.Buffer, destination M.Socksaddr) error {
if !destination.IsIP() {
return E.Cause(os.ErrInvalid, "invalid destination")
@@ -150,7 +174,7 @@ func (w *UDPBackWriter) WritePacket(packetBuffer *buf.Buffer, destination M.Sock
return nil
}
func gWriteUnreachable(gStack *stack.Stack, packet *stack.PacketBuffer, err error) error {
func gWriteUnreachable(gStack *stack.Stack, packet *stack.PacketBuffer) error {
if packet.NetworkProtocolNumber == header.IPv4ProtocolNumber {
return gonet.TranslateNetstackError(gStack.NetworkProtocolInstance(header.IPv4ProtocolNumber).(stack.RejectIPv4WithHandler).SendRejectionError(packet, stack.RejectIPv4WithICMPPortUnreachable, true))
} else {