add `V6Only` (#1677)

* add `V6Only`

* add `V6Only`

infra/conf/transport_internet.go

@@ -727,6 +727,7 @@ type SocketConfig struct {
 	TCPKeepAliveInterval int32       `json:"tcpKeepAliveInterval"`
 	TCPKeepAliveIdle     int32       `json:"tcpKeepAliveIdle"`
 	TCPCongestion        string      `json:"tcpCongestion"`
+	V6only               bool        `json:"v6only"`
 	Interface            string      `json:"interface"`
 }
 
@@ -777,6 +778,7 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 		TcpKeepAliveInterval: c.TCPKeepAliveInterval,
 		TcpKeepAliveIdle:     c.TCPKeepAliveIdle,
 		TcpCongestion:        c.TCPCongestion,
+		V6Only:               c.V6only,
 		Interface:            c.Interface,
 	}, nil
 }

transport/internet/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
-// 	protoc        v3.21.12
+// 	protoc        v4.22.0
 // source: transport/internet/config.proto
 
 package internet
@@ -426,6 +426,7 @@ type SocketConfig struct {
 	TcpKeepAliveIdle           int32          `protobuf:"varint,11,opt,name=tcp_keep_alive_idle,json=tcpKeepAliveIdle,proto3" json:"tcp_keep_alive_idle,omitempty"`
 	TcpCongestion              string         `protobuf:"bytes,12,opt,name=tcp_congestion,json=tcpCongestion,proto3" json:"tcp_congestion,omitempty"`
 	Interface                  string         `protobuf:"bytes,13,opt,name=interface,proto3" json:"interface,omitempty"`
+	V6Only                     bool           `protobuf:"varint,14,opt,name=v6only,proto3" json:"v6only,omitempty"`
 }
 
 func (x *SocketConfig) Reset() {
@@ -551,6 +552,13 @@ func (x *SocketConfig) GetInterface() string {
 	return ""
 }
 
+func (x *SocketConfig) GetV6Only() bool {
+	if x != nil {
+		return x.V6Only
+	}
+	return false
+}
+
 var File_transport_internet_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_config_proto_rawDesc = []byte{
@@ -603,7 +611,7 @@ var file_transport_internet_config_proto_rawDesc = []byte{
 	0x12, 0x30, 0x0a, 0x13, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x4c, 0x61, 0x79,
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@@ -640,27 +648,29 @@ var file_transport_internet_config_proto_rawDesc = []byte{
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 }
 
 var (

transport/internet/config.proto

@@ -100,4 +100,6 @@ message SocketConfig {
   string tcp_congestion = 12;
   
   string interface = 13;
+
+  bool   v6only = 14;
 }

transport/internet/sockopt_linux.go

@@ -155,6 +155,12 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
 		}
 	}
 
+	if config.V6Only {
+		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, syscall.IPV6_V6ONLY, 1); err != nil {
+			return newError("failed to set IPV6_V6ONLY", err)
+		}
+	}
+
 	return nil
 }