try adding ipv6 only mode for ssu

SSU.cpp

@@ -10,12 +10,31 @@ namespace i2p
 {
 namespace transport
 {
-	SSUServer::SSUServer (int port): m_Thread (nullptr), m_ThreadV6 (nullptr), m_ReceiversThread (nullptr),
+
+	SSUServer::SSUServer (const boost::asio::ip::address & addr, int port):
+		m_OnlyV6(true), m_IsRunning(false),
+		m_Thread (nullptr), m_ThreadV6 (nullptr), m_ReceiversThread (nullptr),
+		m_Work (m_Service), m_WorkV6 (m_ServiceV6), m_ReceiversWork (m_ReceiversService), 
+		m_EndpointV6 (addr, port), 
+		m_Socket (m_ReceiversService, m_Endpoint), m_SocketV6 (m_ReceiversService), 
+		m_IntroducersUpdateTimer (m_Service), m_PeerTestsCleanupTimer (m_Service)	
+	{
+		m_SocketV6.open (boost::asio::ip::udp::v6());
+		m_SocketV6.set_option (boost::asio::ip::v6_only (true));
+		m_SocketV6.set_option (boost::asio::socket_base::receive_buffer_size (65535));
+		m_SocketV6.set_option (boost::asio::socket_base::send_buffer_size (65535));
+		m_SocketV6.bind (m_EndpointV6);
+	}
+	
+	SSUServer::SSUServer (int port):
+		m_OnlyV6(false), m_IsRunning(false),
+		m_Thread (nullptr), m_ThreadV6 (nullptr), m_ReceiversThread (nullptr),
 		m_Work (m_Service), m_WorkV6 (m_ServiceV6), m_ReceiversWork (m_ReceiversService), 
 		m_Endpoint (boost::asio::ip::udp::v4 (), port), m_EndpointV6 (boost::asio::ip::udp::v6 (), port), 
 		m_Socket (m_ReceiversService, m_Endpoint), m_SocketV6 (m_ReceiversService), 
 		m_IntroducersUpdateTimer (m_Service), m_PeerTestsCleanupTimer (m_Service)	
 	{
+		
 		m_Socket.set_option (boost::asio::socket_base::receive_buffer_size (65535));
 		m_Socket.set_option (boost::asio::socket_base::send_buffer_size (65535));
 		if (context.SupportsV6 ())
@@ -36,8 +55,11 @@ namespace transport
 	{
 		m_IsRunning = true;
 		m_ReceiversThread = new std::thread (std::bind (&SSUServer::RunReceivers, this));
+		if (!m_OnlyV6)
+		{
 			m_Thread = new std::thread (std::bind (&SSUServer::Run, this));
 			m_ReceiversService.post (std::bind (&SSUServer::Receive, this));
+		}
 		if (context.SupportsV6 ())
 		{	
 			m_ThreadV6 = new std::thread (std::bind (&SSUServer::RunV6, this));

SSU.h

@@ -37,6 +37,7 @@ namespace transport
 		public:
 
 			SSUServer (int port);
+			SSUServer (const boost::asio::ip::address & addr, int port);			// ipv6 only constructor
 			~SSUServer ();
 			void Start ();
 			void Stop ();
@@ -95,6 +96,7 @@ namespace transport
 				std::shared_ptr<SSUSession> session; // for Bob to Alice
 			};
 			
+			bool m_OnlyV6;			
 			bool m_IsRunning;
 			std::thread * m_Thread, * m_ThreadV6, * m_ReceiversThread;	
 			boost::asio::io_service m_Service, m_ServiceV6, m_ReceiversService;

Transports.cpp

@@ -120,11 +120,14 @@ namespace transport
 				m_NTCPServer->Start ();
 			}	
 			
-			if (address->transportStyle == RouterInfo::eTransportSSU && address->host.is_v4 ())
+			if (address->transportStyle == RouterInfo::eTransportSSU)
 			{
 				if (!m_SSUServer)
 				{
+					if (address->host.is_v4())
 						m_SSUServer = new SSUServer (address->port);
+					else
+						m_SSUServer = new SSUServer (address->host, address->port);
 					LogPrint (eLogInfo, "Transports: Start listening UDP port ", address->port);
 					m_SSUServer->Start ();	
 					DetectExternalIP ();