send data discarded messages

include/llarp/messages/discard.hpp

@@ -58,10 +58,8 @@ namespace llarp
       {
       }
 
-      DataDiscardMessage(const PathID_t& src, const PathID_t& dst, uint64_t s)
-          : P(dst)
+      DataDiscardMessage(const PathID_t& dst, uint64_t s) : P(dst)
       {
-        from    = src;
         S       = s;
         version = LLARP_PROTO_VERSION;
       }

llarp/transit_hop.cpp

@@ -54,7 +54,6 @@ namespace llarp
     TransitHop::SendRoutingMessage(llarp::routing::IMessage* msg,
                                    llarp_router* r)
     {
-      msg->S = m_SequenceNum++;
       byte_t tmp[MAX_LINK_MSG_SIZE - 1024];
       auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
       if(!msg->BEncode(&buf))
@@ -151,8 +150,9 @@ namespace llarp
       auto path = r->paths.GetByUpstream(r->pubkey(), msg->P);
       if(!path)
       {
-        llarp::LogWarn("No such path for path transfer pathid=", msg->P);
-        return false;
+        llarp::routing::DataDiscardMessage discarded(msg->P, msg->S);
+        path = r->paths.GetByUpstream(r->pubkey(), msg->from);
+        return path && path->SendRoutingMessage(&discarded, r);
       }
 
       byte_t tmp[service::MAX_PROTOCOL_MESSAGE_SIZE];