enhance TDULC CALL_TERM handling in dvmhost; allow dvmfne to optionally drop TDULC CALL_TERMs or pass them;

configs/fne-config.example.yml

@@ -89,6 +89,8 @@ master:
     disallowExtAdjStsBcast: true
     # Flag indicating whether or not a conventional site can override affiliation rules.
     allowConvSiteAffOverride: true
+    # Flag indicating whether or not a TDULC call terminations will pass to any peers.
+    disallowCallTerm: false
 
     # Flag indicating that traffic headers will be filtered by destination ID (i.e. valid RID or valid TGID).
     filterHeaders: true

src/fne/network/FNENetwork.cpp

@@ -82,6 +82,7 @@ FNENetwork::FNENetwork(HostFNE* host, const std::string& address, uint16_t port,
     m_disallowAdjStsBcast(false),
     m_disallowExtAdjStsBcast(true),
     m_allowConvSiteAffOverride(false),
+    m_disallowCallTerm(false),
     m_restrictGrantToAffOnly(false),
     m_filterHeaders(true),
     m_filterTerminators(true),
@@ -126,6 +127,7 @@ void FNENetwork::setOptions(yaml::Node& conf, bool printOptions)
     m_disallowAdjStsBcast = conf["disallowAdjStsBcast"].as<bool>(false);
     m_disallowExtAdjStsBcast = conf["disallowExtAdjStsBcast"].as<bool>(true);
     m_allowConvSiteAffOverride = conf["allowConvSiteAffOverride"].as<bool>(true);
+    m_disallowCallTerm = conf["disallowCallTerm"].as<bool>(false);
     m_softConnLimit = conf["connectionLimit"].as<uint32_t>(MAX_HARD_CONN_CAP);
 
     if (m_softConnLimit > MAX_HARD_CONN_CAP) {
@@ -183,6 +185,7 @@ void FNENetwork::setOptions(yaml::Node& conf, bool printOptions)
         LogInfo("    Disable Packet Data: %s", m_disablePacketData ? "yes" : "no");
         LogInfo("    Dump Packet Data: %s", m_dumpPacketData ? "yes" : "no");
         LogInfo("    Disable P25 ADJ_STS_BCAST to external peers: %s", m_disallowExtAdjStsBcast ? "yes" : "no");
+        LogInfo("    Disable P25 TDULC call termination broadcasts to any peers: %s", m_disallowCallTerm ? "yes" : "no");
         LogInfo("    Allow conventional sites to override affiliation and receive all traffic: %s", m_allowConvSiteAffOverride ? "yes" : "no");
         LogInfo("    Restrict grant response by affiliation: %s", m_restrictGrantToAffOnly ? "yes" : "no");
         LogInfo("    Traffic Headers Filtered by Destination ID: %s", m_filterHeaders ? "yes" : "no");

src/fne/network/FNENetwork.h

@@ -456,6 +456,7 @@ namespace network
         bool m_disallowAdjStsBcast;
         bool m_disallowExtAdjStsBcast;
         bool m_allowConvSiteAffOverride;
+        bool m_disallowCallTerm;
         bool m_restrictGrantToAffOnly;
 
         bool m_filterHeaders;

src/fne/network/callhandler/TagP25Data.cpp

@@ -778,7 +778,8 @@ bool TagP25Data::processTSDUFrom(uint8_t* buffer, uint32_t peerId, uint8_t duid)
             // handle standard P25 reference opcodes
             switch (tdulc->getLCO()) {
             case LCO::CALL_TERM:
-                return false; // discard call terms at the FNE
+                if (m_network->m_disallowCallTerm)
+                    return false;
             default:
                 break;
             }

src/host/p25/packet/Voice.cpp

@@ -5,7 +5,7 @@
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  *  Copyright (C) 2016,2017,2018 Jonathan Naylor, G4KLX
- *  Copyright (C) 2017-2024 Bryan Biedenkapp, N2PLL
+ *  Copyright (C) 2017-2025 Bryan Biedenkapp, N2PLL
  *
  */
 #include "Defines.h"
@@ -1358,6 +1358,18 @@ bool Voice::processNetwork(uint8_t* data, uint32_t len, lc::LC& control, data::L
             // currently ignored -- this is a TODO
             break;
         case DUID::TDU:
+        case DUID::TDULC:
+            if (duid == DUID::TDULC) {
+                std::unique_ptr<lc::TDULC> tdulc = lc::tdulc::TDULCFactory::createTDULC(data);
+                if (tdulc == nullptr) {
+                    LogWarning(LOG_NET, P25_TDULC_STR ", undecodable TDULC");
+                }
+                else {
+                    if (tdulc->getLCO() != LCO::CALL_TERM)
+                        break;
+                }
+            }
+
             // ignore a TDU that doesn't contain our destination ID
             if (control.getDstId() != m_p25->m_netLastDstId) {
                 return false;
@@ -1384,9 +1396,6 @@ bool Voice::processNetwork(uint8_t* data, uint32_t len, lc::LC& control, data::L
                 resetNet();
             }
             break;
-        case DUID::TDULC:
-            // currently ignored
-            break;
 
         default:
             break;