Only log an error if fork version is higher AND is not known.

src/cryptonote_core/cryptonote_core.cpp

@@ -1418,6 +1418,11 @@ namespace cryptonote
     return true;
   }
   //-----------------------------------------------------------------------------------------------
+  uint8_t core::get_ideal_hard_fork_version() const
+  {
+    return get_blockchain_storage().get_ideal_hard_fork_version();
+  }
+  //-----------------------------------------------------------------------------------------------
   uint8_t core::get_ideal_hard_fork_version(uint64_t height) const
   {
     return get_blockchain_storage().get_ideal_hard_fork_version(height);

src/cryptonote_core/cryptonote_core.h

@@ -641,6 +641,13 @@ namespace cryptonote
       */
      uint64_t get_target_blockchain_height() const;
 
+     /**
+      * @brief returns the newest hardfork version known to the blockchain
+      *
+      * @return the version
+      */
+     uint8_t get_ideal_hard_fork_version() const;
+
      /**
       * @brief return the ideal hard fork version for a given block height
       *

src/cryptonote_protocol/cryptonote_protocol_handler.inl

@@ -271,7 +271,7 @@ namespace cryptonote
       const uint8_t version = m_core.get_ideal_hard_fork_version(hshd.current_height - 1);
       if (version >= 6 && version != hshd.top_version)
       {
-        if (version < hshd.top_version)
+        if (version < hshd.top_version && version == m_core.get_ideal_hard_fork_version())
           MCLOG_RED(el::Level::Warning, "global", context << " peer claims higher version that we think (" <<
               (unsigned)hshd.top_version << " for " << (hshd.current_height - 1) << " instead of " << (unsigned)version <<
               ") - we may be forked from the network and a software upgrade may be needed");

tests/core_proxy/core_proxy.h

@@ -97,6 +97,7 @@ namespace tests
     bool get_blocks(uint64_t start_offset, size_t count, std::list<std::pair<cryptonote::blobdata, cryptonote::block>>& blocks, std::list<cryptonote::blobdata>& txs) const { return false; }
     bool get_transactions(const std::vector<crypto::hash>& txs_ids, std::list<cryptonote::transaction>& txs, std::list<crypto::hash>& missed_txs) const { return false; }
     bool get_block_by_hash(const crypto::hash &h, cryptonote::block &blk, bool *orphan = NULL) const { return false; }
+    uint8_t get_ideal_hard_fork_version() const { return 0; }
     uint8_t get_ideal_hard_fork_version(uint64_t height) const { return 0; }
     uint8_t get_hard_fork_version(uint64_t height) const { return 0; }
     cryptonote::difficulty_type get_block_cumulative_difficulty(uint64_t height) const { return 0; }

tests/unit_tests/ban.cpp

@@ -76,6 +76,7 @@ public:
   bool get_blocks(uint64_t start_offset, size_t count, std::list<std::pair<cryptonote::blobdata, cryptonote::block>>& blocks, std::list<cryptonote::blobdata>& txs) const { return false; }
   bool get_transactions(const std::vector<crypto::hash>& txs_ids, std::list<cryptonote::transaction>& txs, std::list<crypto::hash>& missed_txs) const { return false; }
   bool get_block_by_hash(const crypto::hash &h, cryptonote::block &blk, bool *orphan = NULL) const { return false; }
+  uint8_t get_ideal_hard_fork_version() const { return 0; }
   uint8_t get_ideal_hard_fork_version(uint64_t height) const { return 0; }
   uint8_t get_hard_fork_version(uint64_t height) const { return 0; }
   cryptonote::difficulty_type get_block_cumulative_difficulty(uint64_t height) const { return 0; }