add V6Only

infra/conf/transport_internet.go

@@ -709,6 +709,7 @@ type SocketConfig struct {
 	TCPKeepAliveInterval int32       `json:"tcpKeepAliveInterval"`
 	TCPKeepAliveIdle     int32       `json:"tcpKeepAliveIdle"`
 	TCPCongestion        string      `json:"tcpCongestion"`
+	V6only               bool        `json:"v6only"`
 	Interface            string      `json:"interface"`
 }
 
@@ -759,6 +760,7 @@ 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.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
 }