don't accept tunnels if bandwidth is exceeded

I2NPProtocol.cpp

@@ -281,7 +281,8 @@ namespace i2p
 				i2p::crypto::ElGamalDecrypt (i2p::context.GetEncryptionPrivateKey (), record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText);
 				// replace record to reply			
 				if (i2p::context.AcceptsTunnels () && 
-					i2p::tunnel::tunnels.GetTransitTunnels ().size () <= MAX_NUM_TRANSIT_TUNNELS)
+					i2p::tunnel::tunnels.GetTransitTunnels ().size () <= MAX_NUM_TRANSIT_TUNNELS &&
+					!i2p::transport::transports.IsBandwidthExceeded ())
 				{	
 					i2p::tunnel::TransitTunnel * transitTunnel = 
 						i2p::tunnel::CreateTransitTunnel (

NetDb.cpp

@@ -917,7 +917,7 @@ namespace data
 			[compatibleWith](std::shared_ptr<const RouterInfo> router)->bool 
 			{ 
 				return !router->IsHidden () && router != compatibleWith &&
-					router->IsCompatible (*compatibleWith) && (router->GetCaps () & RouterInfo::eHighBandwidth); 
+					router->IsCompatible (*compatibleWith) && router->IsHighBandwidth (); 
 			});
 	}	
 	

RouterInfo.h

@@ -118,6 +118,7 @@ namespace data
 			bool IsIntroducer () const { return m_Caps & eSSUIntroducer; };
 			bool IsPeerTesting () const { return m_Caps & eSSUTesting; };
 			bool IsHidden () const { return m_Caps & eHidden; };
+			bool IsHighBandwidth () const { return m_Caps & RouterInfo::eHighBandwidth; };
 
 			uint8_t GetCaps () const { return m_Caps; };	
 			void SetCaps (uint8_t caps);

Transports.cpp

@@ -199,6 +199,11 @@ namespace transport
 		m_LastOutBandwidthUpdateBytes = m_TotalSentBytes;		
 	}
 
+	bool Transports::IsBandwidthExceeded () const
+	{
+		if (i2p::context.GetRouterInfo ().IsHighBandwidth ()) return false;
+		return std::max (m_InBandwidth, m_OutBandwidth) > LOW_BANDWIDTH_LIMIT;
+	}
 
 	void Transports::SendMessage (const i2p::data::IdentHash& ident, i2p::I2NPMessage * msg)
 	{

Transports.h

@@ -68,6 +68,7 @@ namespace transport
 	};	
 	
 	const size_t SESSION_CREATION_TIMEOUT = 10; // in seconds
+	const uint32_t LOW_BANDWIDTH_LIMIT = 32*1024; // 32KBs
 	class Transports
 	{
 		public:
@@ -96,6 +97,7 @@ namespace transport
 			uint64_t GetTotalReceivedBytes () const { return m_TotalReceivedBytes; };		
 			uint32_t GetInBandwidth () const { return m_InBandwidth; }; // bytes per second
 			uint32_t GetOutBandwidth () const { return m_OutBandwidth; }; // bytes per second
+			bool IsBandwidthExceeded () const;
 
 		private: