propagate error to client

llarp/messages/relay_commit.cpp

@@ -259,6 +259,9 @@ namespace llarp
         if(self->context->CheckPathLimitHitByIP(self->fromAddr))
         {
           llarp::LogError("client path build limited ", self->hop->info);
+          OnForwardLRCMResult(self->context->Router(), self->hop->info.rxID,
+                              self->hop->info.downstream, self->hop->pathKey,
+                              SendStatus::Congestion);
           self->hop = nullptr;
           return;
         }

llarp/path/path_context.cpp

@@ -36,7 +36,10 @@ namespace llarp
     PathContext::CheckPathLimitHitByIP(const llarp::Addr& ip)
     {
       llarp::Addr remote = ip;
+      // set port to zero
       remote.port(0);
+      // try inserting remote address by ip into decaying hash set
+      // if it cannot insert it has hit a limit
       return not m_PathLimits.Insert(remote);
     }