net: rename DEFAULT_BANSCORE_THRESHOLD to DISCOURAGEMENT_THRESHOLD

and move it from validation to net processing.

src/net_processing.cpp

@@ -1016,7 +1016,7 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
 }
 
 /**
- * Increment peer's misbehavior score. If the new value >= DEFAULT_BANSCORE_THRESHOLD, mark the node
+ * Increment peer's misbehavior score. If the new value >= DISCOURAGEMENT_THRESHOLD, mark the node
  * to be discouraged, meaning the peer might be disconnected and added to the discouragement filter.
  */
 void Misbehaving(NodeId pnode, int howmuch, const std::string& message) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
@@ -1030,7 +1030,7 @@ void Misbehaving(NodeId pnode, int howmuch, const std::string& message) EXCLUSIV
 
     state->nMisbehavior += howmuch;
     std::string message_prefixed = message.empty() ? "" : (": " + message);
-    if (state->nMisbehavior >= DEFAULT_BANSCORE_THRESHOLD && state->nMisbehavior - howmuch < DEFAULT_BANSCORE_THRESHOLD)
+    if (state->nMisbehavior >= DISCOURAGEMENT_THRESHOLD && state->nMisbehavior - howmuch < DISCOURAGEMENT_THRESHOLD)
     {
         LogPrint(BCLog::NET, "%s: %s peer=%d (%d -> %d) DISCOURAGE THRESHOLD EXCEEDED%s\n", __func__, state->name, pnode, state->nMisbehavior-howmuch, state->nMisbehavior, message_prefixed);
         state->m_should_discourage = true;

src/net_processing.h

@@ -23,6 +23,8 @@ static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
 static const unsigned int DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN = 100;
 static const bool DEFAULT_PEERBLOOMFILTERS = false;
 static const bool DEFAULT_PEERBLOCKFILTERS = false;
+/** Threshold for marking a node to be discouraged, e.g. disconnected and added to the discouragement filter. */
+static const int DISCOURAGEMENT_THRESHOLD{100};
 
 class PeerLogicValidation final : public CValidationInterface, public NetEventsInterface {
 private:

src/test/denialofservice_tests.cpp

@@ -232,14 +232,14 @@ BOOST_AUTO_TEST_CASE(DoS_banning)
     dummyNode1.fSuccessfullyConnected = true;
     {
         LOCK(cs_main);
-        Misbehaving(dummyNode1.GetId(), DEFAULT_BANSCORE_THRESHOLD); // Should get banned
+        Misbehaving(dummyNode1.GetId(), DISCOURAGEMENT_THRESHOLD); // Should be discouraged
     }
     {
         LOCK2(cs_main, dummyNode1.cs_sendProcessing);
         BOOST_CHECK(peerLogic->SendMessages(&dummyNode1));
     }
     BOOST_CHECK(banman->IsDiscouraged(addr1));
-    BOOST_CHECK(!banman->IsDiscouraged(ip(0xa0b0c001|0x0000ff00))); // Different IP, not banned
+    BOOST_CHECK(!banman->IsDiscouraged(ip(0xa0b0c001|0x0000ff00))); // Different IP, not discouraged
 
     CAddress addr2(ip(0xa0b0c002), NODE_NONE);
     CNode dummyNode2(id++, NODE_NETWORK, 0, INVALID_SOCKET, addr2, 1, 1, CAddress(), "", true);
@@ -255,7 +255,7 @@ BOOST_AUTO_TEST_CASE(DoS_banning)
         LOCK2(cs_main, dummyNode2.cs_sendProcessing);
         BOOST_CHECK(peerLogic->SendMessages(&dummyNode2));
     }
-    BOOST_CHECK(!banman->IsDiscouraged(addr2)); // 2 not banned yet...
+    BOOST_CHECK(!banman->IsDiscouraged(addr2)); // 2 not discouraged yet...
     BOOST_CHECK(banman->IsDiscouraged(addr1));  // ... but 1 still should be
     {
         LOCK(cs_main);
@@ -287,7 +287,7 @@ BOOST_AUTO_TEST_CASE(DoS_banscore)
     dummyNode1.fSuccessfullyConnected = true;
     {
         LOCK(cs_main);
-        Misbehaving(dummyNode1.GetId(), DEFAULT_BANSCORE_THRESHOLD - 11);
+        Misbehaving(dummyNode1.GetId(), DISCOURAGEMENT_THRESHOLD - 11);
     }
     {
         LOCK2(cs_main, dummyNode1.cs_sendProcessing);
@@ -336,7 +336,7 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
 
     {
         LOCK(cs_main);
-        Misbehaving(dummyNode.GetId(), DEFAULT_BANSCORE_THRESHOLD);
+        Misbehaving(dummyNode.GetId(), DISCOURAGEMENT_THRESHOLD);
     }
     {
         LOCK2(cs_main, dummyNode.cs_sendProcessing);

src/validation.h

@@ -74,7 +74,6 @@ static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
 static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
 static const bool DEFAULT_TXINDEX = false;
 static const char* const DEFAULT_BLOCKFILTERINDEX = "0";
-static const int DEFAULT_BANSCORE_THRESHOLD = 100;
 /** Default for -persistmempool */
 static const bool DEFAULT_PERSIST_MEMPOOL = true;
 /** Default for using fee filter */

test/functional/p2p_leak.py

@@ -26,7 +26,7 @@ from test_framework.util import (
     wait_until,
 )
 
-DEFAULT_BANSCORE_THRESHOLD = 100
+DISCOURAGEMENT_THRESHOLD = 100
 
 
 class CLazyNode(P2PInterface):
@@ -70,7 +70,7 @@ class CNodeNoVersionBan(CLazyNode):
     # NOTE: implementation-specific check here. Remove if bitcoind ban behavior changes
     def on_open(self):
         super().on_open()
-        for _ in range(DEFAULT_BANSCORE_THRESHOLD):
+        for _ in range(DISCOURAGEMENT_THRESHOLD):
             self.send_message(msg_verack())
 
 # Node that never sends a version. This one just sits idle and hopes to receive