Merge #18968: doc: noban precludes maxuploadtarget disconnects

fa9604c doc: noban precludes maxuploadtarget disconnects (MarcoFalke)
fa3999f net: Reformat excessively long if condition into multiple lines (MarcoFalke)

Pull request description:

  Whitelisting has been replaced by permission flags, so properly document this. See also #10131

ACKs for top commit:
  hebasto:
    ACK fa9604c, I have reviewed the code and it looks OK, I agree it can be merged.
  ariard:
    ACK fa9604c

Tree-SHA512: 5aee917ab9817719f01ec155487542118e17fa3d145ae7e4bc0e872b2cec39cde9e7fbdee2ae77e9a52700dd8bcc366de4224152e08e709d44d08e0d2f19c613

Author: MarcoFalke

doc/reduce-traffic.md

@@ -23,7 +23,7 @@ longer serving historic blocks (blocks older than one week).
 Keep in mind that new nodes require other nodes that are willing to serve
 historic blocks.
 
-Whitelisted peers will never be disconnected, although their traffic counts for
+Peers with the `noban` permission will never be disconnected, although their traffic counts for
 calculating the target.
 
 ## 2. Disable "listening" (`-listen=0`)

src/init.cpp

@@ -442,7 +442,7 @@ void SetupServerArgs(NodeContext& node)
     gArgs.AddArg("-maxreceivebuffer=<n>", strprintf("Maximum per-connection receive buffer, <n>*1000 bytes (default: %u)", DEFAULT_MAXRECEIVEBUFFER), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     gArgs.AddArg("-maxsendbuffer=<n>", strprintf("Maximum per-connection send buffer, <n>*1000 bytes (default: %u)", DEFAULT_MAXSENDBUFFER), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     gArgs.AddArg("-maxtimeadjustment", strprintf("Maximum allowed median peer time offset adjustment. Local perspective of time may be influenced by peers forward or backward by this amount. (default: %u seconds)", DEFAULT_MAX_TIME_ADJUSTMENT), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
-    gArgs.AddArg("-maxuploadtarget=<n>", strprintf("Tries to keep outbound traffic under the given target (in MiB per 24h), 0 = no limit (default: %d)", DEFAULT_MAX_UPLOAD_TARGET), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
+    gArgs.AddArg("-maxuploadtarget=<n>", strprintf("Tries to keep outbound traffic under the given target (in MiB per 24h). Limit does not apply to peers with 'noban' permission. 0 = no limit (default: %d)", DEFAULT_MAX_UPLOAD_TARGET), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     gArgs.AddArg("-onion=<ip:port>", "Use separate SOCKS5 proxy to reach peers via Tor hidden services, set -noonion to disable (default: -proxy)", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     gArgs.AddArg("-onlynet=<net>", "Make outgoing connections only through network <net> (ipv4, ipv6 or onion). Incoming connections are not affected by this option. This option can be specified multiple times to allow multiple networks.", ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);
     gArgs.AddArg("-peerbloomfilters", strprintf("Support filtering of blocks and transaction with bloom filters (default: %u)", DEFAULT_PEERBLOOMFILTERS), ArgsManager::ALLOW_ANY, OptionsCategory::CONNECTION);

src/net.cpp

@@ -2639,7 +2639,7 @@ void CConnman::RecordBytesSent(uint64_t bytes)
         nMaxOutboundTotalBytesSentInCycle = 0;
     }
 
-    // TODO, exclude whitebind peers
+    // TODO, exclude peers with noban permission
     nMaxOutboundTotalBytesSentInCycle += bytes;
 }
 

src/net_processing.cpp

@@ -1509,9 +1509,11 @@ void static ProcessGetBlockData(CNode& pfrom, const CChainParams& chainparams, c
     }
     const CNetMsgMaker msgMaker(pfrom.GetSendVersion());
     // disconnect node in case we have reached the outbound limit for serving historical blocks
-    // never disconnect whitelisted nodes
-    if (send && connman->OutboundTargetReached(true) && ( ((pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - pindex->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.type == MSG_FILTERED_BLOCK) && !pfrom.HasPermission(PF_NOBAN))
-    {
+    if (send &&
+        connman->OutboundTargetReached(true) &&
+        (((pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - pindex->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.type == MSG_FILTERED_BLOCK) &&
+        !pfrom.HasPermission(PF_NOBAN) // never disconnect nodes with the noban permission
+    ) {
         LogPrint(BCLog::NET, "historical block serving limit reached, disconnect peer=%d\n", pfrom.GetId());
 
         //disconnect node

test/functional/feature_maxuploadtarget.py

@@ -138,8 +138,7 @@ def run_test(self):
         self.nodes[0].disconnect_p2ps()
 
         self.log.info("Restarting node 0 with noban permission and 1MB maxuploadtarget")
-        self.stop_node(0)
-        self.start_node(0, ["[email protected]", "-maxuploadtarget=1"])
+        self.restart_node(0, ["[email protected]", "-maxuploadtarget=1"])
 
         # Reconnect to self.nodes[0]
         self.nodes[0].add_p2p_connection(TestP2PConn())
@@ -152,9 +151,9 @@ def run_test(self):
 
         getdata_request.inv = [CInv(MSG_BLOCK, big_old_block)]
         self.nodes[0].p2p.send_and_ping(getdata_request)
-        assert_equal(len(self.nodes[0].getpeerinfo()), 1) #node is still connected because of the whitelist
+        assert_equal(len(self.nodes[0].getpeerinfo()), 1)  #node is still connected because of the noban permission
 
-        self.log.info("Peer still connected after trying to download old block (whitelisted)")
+        self.log.info("Peer still connected after trying to download old block (noban permission)")
 
 if __name__ == '__main__':
     MaxUploadTest().main()