Fix gvisor UDP nat

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/sagernet/gvisor v0.0.0-20241021032506-a4324256e4a3
 	github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a
 	github.com/sagernet/nftables v0.3.0-beta.4
-	github.com/sagernet/sing v0.6.0-alpha.2
+	github.com/sagernet/sing v0.6.0-alpha.3
 	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba
 	golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8
 	golang.org/x/net v0.26.0

go.sum

@@ -22,10 +22,10 @@ github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a h1:ObwtHN2VpqE0ZN
 github.com/sagernet/netlink v0.0.0-20240612041022-b9a21c07ac6a/go.mod h1:xLnfdiJbSp8rNqYEdIW/6eDO4mVoogml14Bh2hSiFpM=
 github.com/sagernet/nftables v0.3.0-beta.4 h1:kbULlAwAC3jvdGAC1P5Fa3GSxVwQJibNenDW2zaXr8I=
 github.com/sagernet/nftables v0.3.0-beta.4/go.mod h1:OQXAjvjNGGFxaTgVCSTRIhYB5/llyVDeapVoENYBDS8=
-github.com/sagernet/sing v0.5.1-0.20241108153719-d159f022afca h1:KvQpDiQUejNVW5nBH5IroYFkdzzQd4ttAyWE8pelV5A=
-github.com/sagernet/sing v0.5.1-0.20241108153719-d159f022afca/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
-github.com/sagernet/sing v0.6.0-alpha.2 h1:ahXxb2NuZU7eG4mvzbwUkuxOaOadADKGH3+vgnrDdGU=
-github.com/sagernet/sing v0.6.0-alpha.2/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
+github.com/sagernet/sing v0.5.1-0.20241109034027-099899991126 h1:pLMpV9pEAinrS9R1n1JLcbNesCl369RfvyxnYCPrkbw=
+github.com/sagernet/sing v0.5.1-0.20241109034027-099899991126/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
+github.com/sagernet/sing v0.6.0-alpha.3 h1:GLp9d6Gbt+Ioeplauuzojz1nY2J6moceVGYIOv/h5gA=
+github.com/sagernet/sing v0.6.0-alpha.3/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/vishvananda/netns v0.0.4 h1:Oeaw1EM2JMxD51g9uhtC0D7erkIjgmj8+JZc26m1YX8=
 github.com/vishvananda/netns v0.0.4/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=

stack_gvisor_udp.go

@@ -37,7 +37,7 @@ func NewUDPForwarder(ctx context.Context, stack *stack.Stack, handler Handler, t
 		stack:   stack,
 		handler: handler,
 	}
-	forwarder.udpNat = udpnat.New(handler, forwarder.PreparePacketConnection, timeout)
+	forwarder.udpNat = udpnat.New(handler, forwarder.PreparePacketConnection, timeout, true)
 	return forwarder
 }
 

stack_system.go

@@ -153,7 +153,7 @@ func (s *System) start() error {
 		go s.acceptLoop(tcpListener)
 	}
 	s.tcpNat = NewNat(s.ctx, s.udpTimeout)
-	s.udpNat = udpnat.New(s.handler, s.preparePacketConnection, s.udpTimeout)
+	s.udpNat = udpnat.New(s.handler, s.preparePacketConnection, s.udpTimeout, false)
 	return nil
 }